The 13th IEEE International Conference

on

Power Electronics and Drive Systems

(PEDS 2019)

Conference Programme

Blank

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13th IEEE International Conference on

Power Electronics and Drive Systems (PEDS 2019)

Toulouse, France

9 – 12 July 2019

Copyright and Reprint Permission: Abstracting is permitted with credit to the source. Libraries are permitted to photocopy beyond the limit of U.S. copyright law for private use of patrons those articles in this volume that carry a code at the bottom of the first page, provided the per-copy fee indicated in the code is paid through Copyright Clearance Center, 222 Rosewood Drive, Danvers, MA 01923. For reprint or republication permission, email to IEEE Copyrights Manager at pubs-permissions@ieee.org. All rights reserved. Copyright ©2019 by IEEE. ISBN 978-1-5386-6499-8

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IEEE PEDS 2019 Conference Programme Schedule

Centre International de Conférences, Toulouse, France

9 – 12 July, 2019

9 July (Tue) 10 July (Wed) 11 July (Thu) 12 July (Fri)

0830 - 0900

Tutorial Sessions

and Conference

Registration

Venue Setup

0900 – 1040 0900 – 1230

Opening Ceremony

and Plenary Session

1230 – 1240

Conference Group

Photo Taking

S1 Power Semiconductor and

Passive Devices I

S2 Renewable Energy

Technologies

S3 Modelling and Simulations I

S13 Distributed Generation

& Smart Applications Ⅱ

S14 Power Electronics

Technologies Ⅱ

S15 Motor Drive and

Motion Control Ⅱ

Tea Break

1100 – 1240

S4 Power Semiconductor and

Passive DevicesⅡ

S5 Static Converters and

EMI/EMC

S6 Modelling and Simulations

Ⅱ

S16 Analyses and Design of

Electric Machines Ⅱ

S17 Power Control and

Applications

S18 Traction and

Automotive Systems

Lunch

1330 – 1510

1330 - 1500

Poster Session 1

S7 Analyses and Design of

Electric MachinesⅠ

S8 Power Control and

Reliability

S9 Wide Bandgap Power

Device Technologies

Tea Break Tea Break

1530 – 1720 1530 - 1700

Poster Session 2

S10 Distributed Generation &

Smart Applications Ⅰ

S11 Power Electronics

Technologies Ⅰ

S12 Motor Drive and Motion

Control Ⅰ

1830 – 2000 Welcome Reception

1930 – 2230

Conference Dinner at Toulouse

Hotel Dieu Saint Jacques

(1930 – 2030 Cocktail)

(2030 – 2230 Dinner)

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Conference Venue Floor Plan

Level 1

Registration Desk

Auditorium

Level 2

Room A

Room B

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IEEE PEDS 2019 Committee GENERAL CHAIR Prof. Yung C. Liang

National University of Singapore, Singapore

ORGANISING CHAIRS Dr. Yen Kheng Tan, CEO Printed Power, Singapore Prof. Frédéric Morancho Laboratoire d’Analyse et d’Architecture des Systèmes (LAAS-CNRS), France

TECHNICAL PROG CHAIRS Prof. King J. Tseng Singapore Institute of Technology, Singapore Dr. Bernardo Cogo IRT Saint Exupery, France

SPECIAL SESSION CHAIRS Prof. Guillaume Gateau

Laboratoire Plasma et Conversion d’Energie (LAPLACE), France Prof. Ding Zhaohao North China Electric Power University, China

TREASURERS Dr. Ravinder Pal Singh

A*STAR Institute of Microelectronics, Singapore Mr. Dilip Battul Singapore Polytechnic, Singapore

TUTORIAL CHAIR Dr. Tee Hui Teo

Singapore University of Technology and Design, Singapore INDUSTRIAL CHAIRS Dr. Amit Gupta

Rolls-Royce, Singapore Prof. Koki Ogura Kyushu Sangyo University, Japan

INDUSTRY PARTNERS Rolls-Royce, Singapore

Printed Power, Singapore Power Design, France

PUBLICATION Prof. Xin Zhang

Nanyang Technological University, Singapore COMMITTEE MEMBER Dr. Thilo Schoenfeld

Aerospace Valley, France

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IEEE PEDS 2019 International Panel

P. Acarnley, UK Hirofumi Akagi, Japan J. Marcos Alonso, Spain Gehan A. J. Amaratunga, UK Ashoka Bhat, Canada D. Boroyevich, USA B. K. Bose, USA Ke-Horng Chen, Taiwan Yaow-Ming Chen, Taiwan Henry Chung, Hong Kong J. C. Clare, UK Francis P. Dawson, Canada Deepak Divan, USA Malik E. Elbuluk, USA Prasad Enjeti, USA Bulent Ertan, Turkey A. J. Forsyth, UK Hideaki Fujita, Japan T. C. Green, England Yanuarsyah Haroen, Indonesia Jung I. Ha, Korea Boyong He, China Hiang-Kwee Ho, Singapore J. Holtz, Germany Chih-Fang Huang, Taiwan Qin Huang Alex, USA R. S. Y. Hui, Hong Kong John Y. Hung, USA Iqbal Husain, USA Thomas M. Jahns, USA Praveen Jain, UK Juri Jatskevich, Canada K. Jezernik, Slovenia M. K. Kazimierczuk, USA Ralph Kennel, Germany J. Kolar, Switzerland Matsuse Kouki, Japan Jason Lai, USA

Loi Lei Lai, UK Tsorng-Juu Liang, Taiwan Yi-Lu Liu, USA Pascal Lorenz, France Robert D. Lorenz, USA Dongsheng Ma, USA Udaya Madawala, New Zealand Nobuyuki Matsui, Japan Ned Mohan, USA Gabriel Rincón-Mora, USA Chem Nayar, Australia T. Ninomiya, Japan Toshihisa Funabashi, Japan Boon Teck Ooi, Canada Dr. S. Paramasivam, India Z. Qian, China Alex Ruderman, Kazakhstan Dierk Schroeder, Germany H. Sekiya, Japan P. C. Sen, Canada Jul-Ki Seok, Korea M. Shoyama, Japan T. Suetsugu, Japan Seung-Ki Sul, Korea Paolo Tenti, Italy C. K. Michael Tse, Hong Kong Tore M. Undeland, Norway Lixiang Wei, USA Bin Wu, Canada Tsai-Fu Wu, Taiwan J. Daan Van Wyk, USA Dehong Xu, China Dian Guo Xu, China Longya Xu, USA Abdul H B M Yatim, Malaysia Zhengming Zhao, China Georges Zissis, France Sanjeevikumar Padmanaban, South Africa

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IEEE PEDS 2019 - Technical Programme

Tutorial Sessions

Tutorial A

Date/Time: 9 July 2019 Tuesday / 09:30 AM – 12:30 PM

Venue: Centre International de Conférences

Si vs. SiC? 2-Level vs. x-Level Topologies? Open The Competition With New Design Methods &

Solutions for Power Electronics

Prof. Thierry Meynard

Centre National de la Recherche Scientifique (CNRS)/Power Design Technologies, France

Dr Guillaume Fontes

Power Design Technologies, France

Tutorial B

Date/Time: 9 July 2019 Tuesday / 01:30 PM – 04:30 PM Venue: Centre International de Conférences

EMC/EMI in Electric Vehicles – Resolving Electromagnetic Issues with Simulation

Dr. Matthias Tröscher

CST – Dassault Systèmes Deutschland GmbH, Germany

Tutorial C

Date/Time: 9 July 2019 Tuesday / 09:30 AM – 12:30 PM

Venue: IRT Saint Exupéry, 3 Rue Tarfaya, 31400 Toulouse

(Please note that the venue is outside the conference site)

Modern Power Electronics Converters for Aircraft with Wide Bandgap Devices - SiC and GaN

Characterization for High Performance Converters

Dr Bernardo Cougo

IRT Saint-Exupery, Toulouse, France

Tutorial D

Date/Time: 9 July 2019 Tuesday / 01:30 PM – 04:30 PM

Venue: Centre International de Conférences

Stability criteria and modular solutions of power electronics systems

Prof. Frede Blaabjerg

Aalborg University, Aalborg, Denmark

Prof. Jack Xin Zhang

Nanyang Technological University, Singapore

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Conference Opening

Date/Time: 10 July 2019 Wednesday / 09:00 AM – 09:30 AM

Venue: Auditorium

9 am - 9.10 am: Welcome by Frédéric Morancho and Yung C Liang

9.10 am - 9.30 am: LAAS presentation by Liviu Nicu

Plenary Session

Date/Time: 10 July 2019 Wednesday / 09:30 AM – 12:30 PM

Venue: Auditorium

Chairs: Frédéric Morancho

Bernardo Cogo

Power Electronics Challenges for Medium Voltage and High Voltage Grids

Michel Mermet-Guyennet, Programme Director, ITE Supergrid

Airbus Electrification Overall View

Gilles Peres, Head of Electromagnetism Department, Airbus Group

Accelerating Science, Technology Research and Transfer to Industry

Ariel Sirat, General Manager, IRT Saint-Exupery

Power System Design For Aircraft Propulsion Sytems: Implications For Drives Development

Peter Malkin, Strategic Research Advisor, Newcastle University

Poster Session 1 Date/Time: 10 July 2019 Wednesday / 13:30 PM – 15:00 PM

Venue: Room A and Room B

Chair: Koki Ogura 17 Design and Installation of Active Filters for Power Quality Improvement for Water

Treatment Plants Chongrag Boonseng, King Mongkut Institute of Technology, THAILAND Rapeepornpat Boonseng, King Mongkut Institute of Technology, THAILAND A Manee, King Mongkut Institute of Technology, THAILAND N Nilinmitr, King Mongkut Institute of Technology, THAILAND Vijit Kinnares, King Mongkut Institute of Technology, THAILAND

Abstract —This paper presents a simple of active power filters (APF) design techniques to minimize

harmonic distortion and improve power factor caused by a harmonic source such as variable-

frequency drives (VFDs) using 12-pulse converters. A method is finding the maximum rating of active

power filter to minimize voltage and current harmonic distortion at a load bus where it is desired to

maintain the displacement power factor at a desired level constraining the compensator value, which

would create resonance condition. The water treatment plants require the operation of many parallel-

connected VFDs on the same bus, such as a system significantly increases the power quality problems.

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The purpose of APF is sufficient to eliminate the harmonic currents, balance currents of the ac line

input and increase power factor. The results show that the APF are a very appropriate solution for

most typical harmonic problems, unbalanced current and power factor correction.

18 Design and Installation of Hybrid Power Filter for Grid-Connected Solar Rooftop at Plastic

Plants Chongrag Boonseng, King Mongkut Institute of Technology, THAILAND Rapeepornpat Boonseng, King Mongkut Institute of Technology, THAILAND A Manee, King Mongkut Institute of Technology, THAILAND

Abstract- This paper presents a simple of Hybrid Power Filters System(HPFs) design techniques to

minimize harmonic distortion that caused by a harmonic source such as ac drive and solar rooftop

inverters. The predominant harmonic component is the fifth harmonic corresponding. As can be seen,

there is heavy resonance at fifth harmonic when solar inverter are connected to the system, the

consequences was that the equipment will eventually fail or sometimes by literally exploding. A novel

method for implementation of the HPFs is presented to avoid this problem. The HPF arrangements

where are three branches for fifth and seventh harmonic filter by tuning to the 250, 350Hz and active

filter which, can be reduced harmonic more than the other techniques. The major objectives of this

paper are to improve the power factor, to reduced current and voltage distortion and to reduce

resonance problems at a system. Practically, it is ensured that the HPFs are best applied for grid-

connected solar rooftop power system. After installing the HPFs, the harmonic distortion can be

lowered than IEEE 519 standard. The results show that the association of HPFs is a very good solution

for harmonic problems.

49 Design of LC Filter in Synchronous Buck considering Power Loss and Cost Criterions using

Particle Swarm Optimization Xin Zhang, Nanyang Technological University, SINGAPORE Xinze Li, Nanyang Technological University, SINGAPORE

Abstract- Industrial design of LC filter considers only the voltage and current ripples requirements, while many other criterions such as efficiency, cost, volume, reliability have significant impacts on the filter performance. Here, the power loss of synchronous buck converter is optimized through LC design, which represents high-efficiency design. Separately, the cost of filter is also optimized, representing high-economic design. Optimized methods can be used in different applications.

51 Optimal PWM for Three-Level Inverter Fed High Speed Drives Peter Stumpf, Budapest University of Technology and Economics, HUNGARY Sandor Halasz, Budapest University of Technology and Economics, HUNGARY

Abstract-Thanks to new field of applications, like high speed/high-pole drives with high rated

fundamental frequency or multilevel converters powering medium or high voltage drive systems,

optimized PWM techniques became again a hot topic of research interest. The current paper

introduces an optimized PWM technique for three-level inverter, which can be applied to supply high

speed drives at low pulse ratio. The optimization is done for the lowest loss-factor, which is

proportional to the square of rms value of current harmonics. The performance of the optimal PWM

technique is demonstrated by simulation and experimental tests by using a NPC type inverter.

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58 Controlling the Electric Drives of the Reversing Rolling Stand Rolls of a Rolling Mill to Form a Curvature at the Workpiece Front End Vadim Gasiyarov, South Ural State University, RUSSIA Andrey Radionov, South Ural State University, RUSSIA Alexander Karandayev, South Ural State University, RUSSIA Boris Loginov, Magnitogorsk Iron and Steel Works, RUSSIA Vadim Khramshin, Magnitogorsk Nosov State Technical University, RUSSIA

Abstract-The article defines the specifications of a reversing rolling stand of the 5,000 mm plate mill.

It describes the mechanism of vertical bending of a workpiece front end (the so-called ski-end

formation) by the mismatch of speed of the top and bottom rolls (asymmetric rolling). A diagram of

the electric drive control system operating during the ski-end formation is given, functions of the load

division controller are specified. Oscillograph records of speeds and drive torques of the top and

bottom rolls are considered. A slow response is revealed in a parameter mode. A method of the

electric drive control, which ensures a forced reduction of the specified speed mismatch after gripping,

is presented. The structure of a mathematical model, which includes the ski-end formation block and

the engine torque distribution model, is analyzed. The simulation results for rolling patterns

corresponding to the project and developed algorithms of ski-end formation and load division are

provided. A reduction of difference in the engine torques and the time required for their equalization

is confirmed. The oscillograph records of the electric drives coordinates when implementing the

developed method are given. The technical effectiveness of this method implementation on the 5,000

mm mill is verified.

59 Influence of Harmonics On The Interpolated DFT-based Frequency Estimation for The Control of Power in Renewable Energy Systems Using Generalized Maximum Sidelobe Decay Windows Dariusz Kania, Wroclaw University of Science and Technology, POLAND Józef Borkowski, Wroclaw University of Science and Technology, POLAND

Abstract- Harmonic components in a multifrequency signal have a big influence on the frequency

estimation accuracy and play a vital role in a power system performance. They emerge in the grid due

to a large number of nonlinear loads. This paper presents a new estimation method based on

Generalized MSD time windows used to analyze a grid signal distorted by harmonics in the control of

grid-connected photovoltaic systems. The accuracy of the 3-point IpDFT method decreases in the

presence of 3-rd and 5-th harmonics and up to two measured signal cycles there can be chosen

windows for which the frequency error is at the level of 10^-4 or 10-3 Hz/Hz which is a good accuracy

in real time systems. Obtained in various measurement conditions results are useful from a practical

point of view as usually harmonic components are present in the grid signal.

101 Investigation of Sic MOSFET's Channel Reverse Conduction Quang Chuc NGUYEN, IRT Saint-Exupery B612, FRANCE Patrick TOUNSI, LAAS, FRANCE Jean-Pierre FRADIN, ICAM, Site De Toulouse, FRANCE Jean-Michel REYNES, IRT Saint-Exupery B612, FRANCE

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Abstract - In this study, forward and reverse conduction of SiC MOSFETs are characterized. These

measurements allow us to demonstrate that forward and reverse output characteristics are

different, while this was not taken into account in the SPICE model provided by die manufacturers.

The difference is due to the body effect within SiC MOSFET and to the shift in threshold voltage. The

threshold voltage was characterized as a function of the drain-source voltage VDS. It is shown that

VTH decreases a lot when VDS has greater negative values.

114 Multi Objective Decision Making for Improving The Stability and Efficiency of a Multi-Converter System Loaded With Constant Power Load Rashmi Ketan Patel, Sardar Vallabhbahi Patel National Institute of Technology, INDIA Chudamani R, Sardar Vallabhbahi Patel National Institute of Technology, INDIA

Abstract- Multi-converter power electronics system is used in mobile application. There are many

DC/DC, DC/AC and AC/DC converters used to provide different voltage levels. Due to tightly regulated

nature of load, these converters behave like Constant Power Load (CPL) in a multi-converter system,

with a main converter supplying these loads. A CPL has a negative impedance characteristic which

results in a destabilizing effect on the main converter driving them. A Constant Voltage Load (CVL) in

parallel with CPL and parasitic components added in the converter improve the stability of converter.

The parasitic elements when inserted in the circuit will certainly improve the stability of the system

but reduce its efficiency. In order to achieve a given stability limit a tradeoff has to be made with the

efficiency of the system. This paper presents improvement in the stability of converter due to parasitic

elements and CVL and their effect on efficiency of the system. Both CVL and parasitic elements

improve the stability at the cost of efficiency. Therefore, it is essential to find an optimum value of the

parasitic element which improves the stability of the system with least compromise in efficiency.

228 Fault Tolerance Capabilities of Three, Four and Six Phase Configurations of a 24 Slot Modular PMSM Ozan Keysan, Middle East Technical University, TURKEY Göksenin Hande Bayazıt, Middle East Technical University, TURKEY Mesut Uğur, Middle East Technical University, TURKEY

Abstract-In this study, fault tolerance and redundancy capabilities of different phase and winding

configurations of an Integrated Modular Motor Drive (IMMD) system are investigated. This is made

possible by manipulating gate drive signals of the inverter and phase connections. Three and four

phase connections as well as symmetric and asymmetric six-phase topologies are described. Control

strategies and redundancy possibilities of these different topologies under an open circuit fault

condition are examined in MATLAB/Simulink environment and validated with Finite Element Analysis

(FEA) software ANSYS/Maxwell. Considering a decrease of only 12% in average output torque and 0.7%

torque ripple under an open circuit failure recovery operation with rated currents, symmetric six-

phase topology is decided to be the most promising configuration by means of fault tolerance.

248 A Bidirectional Three-Port Current-Fed LC Parallel Resonant Converter Kelly Ribeiro Santos, Geeps- Centralesupelec, FRANCE Daniel Sadarnac, Geeps- Centralesupelec, FRANCE

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Charif Karimi, Geeps- Centralesupelec, FRANCE

Abstract-This paper presents a Three-port current-source bidirectional resonant converter. The

converter achieves zero-voltage switching (ZVS) due to the presence of a parallel resonant tank circuit,

a combination between parallel inductors and capacitors. Moreover, it has reduced output current

ripple and reduced power losses in the transistors if compared with a voltage source topology. The

conversion occurs with self-oscillating switching technique or with forced switching in a pre-

determined frequency range without losing the ZVS conditions. Due to the high frequency transformer

that allows a high voltage ratio between the ports, the converter applications includes different energy

storage systems that require bidirectional power flow capability, such as hybrid vehicles. A design

procedure to select the converter parameters and simulation results are presented to validate the

converter operation principle.

813 A Fast Acting Precharge Control Strategy for Modular Multilevel Converters Ara Bissal, Maschinenfabrik Reinhausen GmbH, GERMANY

Abstract—The modular multilevel converter (MMC) will play a vital role in medium and high voltage

transmission especially when controllability is of utmost importance. A lot of research has been done to

develop different pulse width modulation (PWM) techniques and controls to drive the MMC once it is

online. An important and yet overlooked research topic is how to transition the MMC from black start to

live operation in a fast and controllable manner. In this paper a novel closed loop constant current

charging model using nearest level control (NLC) has been developed. To study the effectiveness of this

method in the presence of capacitor imbalances, three simulation models were prepared. In the first

simulation model, all capacitors were assumed to be identical, in the second, one was assumed to have

80% of the nominal value, and in the last, one was assumed to have 120% of the nominal value. It was found

that in all cases, the model was able to deliver a constant current and constrain the capacitor voltages in

a well defined voltage tolerance band. One drawback was that the second and third simulation models

needed on average 34% and 30% more switching instances to maintain a constant current. If the number

of switching instances are constrained, the developed precharging scheme can serve as a powerful

method to charge a MMC in a fast and controlled manner without any overshoots even in the presence

of capacitor tolerances.

48 Fast Dc Link Voltage Controller Under Large Irradiance Variations in a PV Single-Phase Grid-Connected Inverter Yuniel León Ruiz, Autonomous University of San Luis Potosi­ (UASLP), MEXICO Mario Gonzalez-Garcıa, Autonomous University of San Luis Potosi­ (UASLP), MEXICO Ricardo Alvarez-Salas, Autonomous University of San Luis Potosi­ (UASLP), MEXICO Vıctor Cardenas, Autonomous University of San Luis Potosi­ (UASLP), MEXICO

Abstract—A simple approach to increase the bandwidth of the dc link voltage controller of a grid

connected single-phase photovoltaic (PV) power inverter is proposed in this paper. The operation of

the converter implies the presence of a second order frequency component in the dc link voltage, and

the increment in the conventional voltage controller bandwidth causes total harmonic distortion of

the output current to be deteriorated due to this component. The proposed method is based on the

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design of a lead compensator and a ripple voltage estimator. The former is used to attenuate the low

order harmonic content and to increase the bandwidth, the latter is intended to reduce the ripple

component in the feedback loop of the dc link voltage controller. The procedure to obtain the lead

compensator is discussed and fully validated via simulation results, as well as the ripple estimator

which is derived from the power balance on the dc link, for different sudden changes of the solar

irradiance.

79 Speed Smooth Control for Brushless DC Machine under Cogging Torque Pollution Conditions Feng WEI, Singapore Institute of Technology, SINGAPORE Shuyu Cao, Singapore Institute of Technology, SINGAPORE King Jet Tseng, Singapore Institute of Technology, SINGAPORE

Abstract-This paper presents a novel speed vibration suppression control of BLDC under cogging

torque. Cogging torque is unmeasurable and has become one of the unavoidable shortages that of

BLDC machine and it results in the speed/torque vibration on the rotational shaft. It is difficult to

eliminate the BLDC cogging torque from machine design optimization. Repetitive control based

compensation is proposed to overcome the BLDC machine cogging torque. The control algorithm is

analyzed in this paper and it is verified by the simulation results.

117 A Bidirectional DC-DC Converter for Battery Electric Light Rail Vehicle and its Test Run Results Koki Ogura, Kyushu Sangyo University, JAPAN Kazuya Nishimura, Kawasaki Heavy Industries, Ltd., JAPAN Yasumasa Oku, Kyoto Associates Co., Ltd., JAPAN

Abstract— Light Rail Vehicles have historically sourced power from overhead power lines. However in

recent years, catenary-free operations are fast gaining prominence. Catenary-free refers to the

removal of the overhead power line equipments from the vehicle system. Power for such systems is

sourced onboard energy storage devices. This paper gives an overview of the next-generation battery-

driven low-floor light rail vehicle named SWIMO, which includes an impressive technology, concept

and test results. The development concept for SWIMO has been to make a vehicle that is ‘good for

people and the environment’ with consideration of the aging of society and environmental concerns.

The SWIMO vehicle is equipped with a charge-discharge control unit mounted on the rooftop that

controls the charge and discharge for on-board batteries. The operating modes of bidirectional buck-

boost converter are also presented and discussed from an innovative point of view.

232 High-Performance Position Sensorless Control of Reluctance Synchronous Motor Using High-Frequency Injection Ahmed Farhan, Technical University of Munich, GERMANY

Abstract—This paper presents an enhanced method for a self-sensing (Sensorless) Field Oriented

Control (FOC) of Reluctance Synchronous Motor (SRM) based on high-frequency signal injection. The

rotor saliency characteristic with the difference between the d-axis and q-axis inductance of the motor

is used for position estimation through adding a small high-frequency current signal injected in an

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arbitrary rotating frame. Modulation technique is applied to the sensed voltages and currents to

extract a signal that is proportional to the difference between the actual position and an estimated

position. This error signal is used as input to a Phase-Locked Loop (PLL)to get the position and the

speed of the machine. Particle Swarm Optimization technique (PSO) is used to tune the parameters

of speed, current and PLL controllers. The major objective of this drive is to give a robust and dynamic

estimation of the rotor angle and speed independent of the operating condition. The proposed

methodology is validated by simulation results to clarify the ability of the proposed technique in

different speed area.

Poster Session 2

Date/Time: 10 July 2019 Wednesday / 15:30 PM – 17:00 PM

Venue: Room A and Room B

Chair: King Jet Tseng

19 Passive Power Filter for Grid-Connected Solar Rooftop Applications for Power Quality Improvement in Industrial Plants Chongrag Boonseng, King Mongkut Institute of Technology, THAILAND Rapeepornpat Boonseng, King Mongkut Institute of Technology, THAILAND A Manee, King Mongkut Institute of Technology, THAILAND

Abstract-This paper presents a study of harmonic filters design to minimize harmonic distortion

caused by a harmonic source such as ac drives and solar rooftop inverters. To avoid a problem caused

by the harmonics which is produced from ac drives and solar inverters, the Passive Power Filters

System (PPFs) are presented. The analysis includes the basic principles, the KMITL Program and

economic aspects of the harmonic filter design. The major objectives in the study are to improve the

power factor, to reduce current and voltage distortion and to reduce resonance problems at a system.

Practically, it is ensured that the PPFs is the best solution applied for grid-connected system. The

results show that the 5th harmonic filters are a very appropriate solution for most typical harmonic

problems.

128 A Novel Method Based On Pulse-Voltage-Injection for Compensation of Gain Errors of

Current Measurements in Ipmsms for EVs Yuping Chen, Robert Bosch Gmbh, Stuttgart, GERMANY Gunther Götting, Robert Bosch Gmbh, GERMANY Lei Chen, Robert Bosch Gmbh, Stuttgart, GERMANY

Abstract— In this paper a new algorithm regarding compensation of gain errors of current

measurements for 3-phase interior permanent-magnet synchronous machines (iPMSMs) is

introduced. As a core feature of the method, a periodic square-wave (pulse) voltage superimposed

with the fundamental commanded voltage is fed to the e-machine, the resulting current response to

the injected voltage pulses is extracted from current measurements and used as the indicator of

current measurement gain errors. Once mistuned gains are detected, they can be rescaled adaptively

by the proposed control scheme. This algorithm shows reliable compensation within a large speed

range, i.e., from standstill until high speed operation of the e-machine. Besides, it is a pure software-

based solution, which can be implemented for sensing system with two- or three-sensor-based

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current measurement. Additionally it demands no electric parameters of iPMSMs if only balancing of

gains between phases is considered. In general, this method can be launched during an initial

commissioning, or as a part of start-up sequence, or periodically during the normal operation of the

machine in Electric Vehicles (EVs).

134 Design of An Adaptive Impedance Matching Converter in Microwave Power Transfer System Xirui Zhu, Nanjing University of Aeronautics and Astronautics, CHINA Ke Jin, Nanjing University of Aeronautics and Astronautics, CHINA Qi Hui, Nanjing University of Aeronautics and Astronautics, CHINA

Abstract—Microwave power transfer (MPT) is one of the most promising systems in the long distance

wireless power transfer system. In MPT system, conventional diode rectifying circuit produces

harmonic energy which has great impact on the overall efficiency as well as the power reflection. In

order to gain adaptive impedance matching and high efficiency, this paper applies power electronic

devices and topology to construct a two-stage 100MHz converter. 100MHz belongs to the radio

frequency (RF) and belongs to the conception of microwave frequency. The two-stage adaptive

impedance matching circuit and its control method are evaluated by simulations. The design of

microstrip antenna is also presented in this paper, experimental results are shown to verify the

effectiveness of the proposed RF-DC converter and the efficiency is up to nearly 65% as well.

167 Control of a 3-Phase Permanent Magnet Synchronous Motor Drive Employing a Slim DC-Link Samyuktha Sivaram, TU Delft and AME, Eindhoven, NETHERLANDS Arjan Van Genderen, TU Delft, NETHERLANDS Ewout Voogt, AME, Eindhoven, NETHERLANDS Jan Schellekens, AME, Eindhoven, NETHERLANDS Jianning Dong, TU Delft, NETHERLANDS

Abstract- A variable speed AC motor drive, fed by a 3-phase AC supply, often consists of a 3-phase

bridge diode rectifier, a DC link capacitor and a pulse width modulated inverter. Recently, a new type

of capacitor, known as film capacitor or slim capacitor has become popular for use in DC links. This

capacitor has a lower value of capacitance and a longer life span than the conventional electrolytic

capacitor. However, drives with slim DC link fed by a soft grid exhibits the tendency to oscillate at

higher frequencies. This can be attributed to the LC resonance between the grid inductance and the

small DC link capacitance which results in a significant unwanted voltage ripples on the DC link. The

unwanted harmonics affects the performance of the motor and distorts current drawn from the grid.

The objective of this paper is to formulate, model and test a control algorithm to dampen the effects

of the LC oscillations. This paper proposes a novel method of compensation that estimates the ideal

DC link voltage without unwanted ripple and feed-forwards the estimated DC link voltage to the motor

drive algorithm thereby altering the behavior of motor drive to be resistive to the ripple. By doing so

the current drawn by the motor from the grid will be less distorted thereby, improving the power

factor of the system and ensuring the system adheres to the harmonic standards.

169 Research and Practice of Testing TCU in HVDC Converter Valve

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Cong Huang, China Southern Power Grid Extra High Voltage Transmission Co., CHINA Rongchao Wang, China Southern Power Grid Extra High Voltage Transmission Co., CHINA Yang Song, China Southern Power Grid Extra High Voltage Transmission Co., CHINA

Abstract：As the basic control unit of thyristor, the reliability of thyristor control unit (TCU) is a fatal

device for the reliability of HVDC transmission system. However, the defects of TCU frequently

occurred in ±500kV Gui Zhong converter station, such as IP loss, IP oscillation, protective triggering

and other abnormal phenomena. Meanwhile, standard of test method and system specially designed

for TCU neither existed in Chinese discipline nor in IEC-60700-1. So it is necessary to design special

tests on TCU which aim to recover the fault and find out the causes before being put into use. The

paper presented the TCU test method, which is used to analyze the fault part of TCU in the converter

station. The defeated components are successfully proved to be clipped triode inside the TCU. The

test method is necessary supplement for test standard, operation and overhaul of HVDC transmission

projects.

188 Multi-Objective Modulation Scheme Development for Optimal Control of Cascaded H-Bridge (CHB) Multilevel Inverters Mohammad Hossein Etesami, Queensland University of Technology, AUSTRALIA MAHINDA VILATHGAMUWA, Queensland University of Technology, AUSTRALIA Marc HILLER, Karlsruhe Institute of Technology, GERMANY Geoff WALKER, Queensland University of Technology, AUSTRALIA Negareh GHASEMI, University of Queensland, AUSTRALIA

Abstract-The problem is defined as seeking optimal operating parameters for a Cascaded H-bridge

(CHB) converter under multi-objective scenarios. An advanced modulation technique is considered to

address the non-ideal situations where dc-link voltage ripples are present. Higher quality waveforms

are achievable by adding to the optimization degree of freedom with more number of decision

variables. DC offset value (VOffset) and chopping or switching frequency (fchop) are added as additional

variables, alongside dc-link voltage levels and firing angles, to be optimally determined as modulation

parameters. This study examines indices such as fchop, weighted total harmonic distortion (WTHD), and

deviation rate (DR) to obtain a systematic platform for specific design priorities. An improved

converter performance with reduced switching loss, suppressed harmonic content, and resilience

against dc-link ripples is of key concern in this study.

205 A 1.5kW Totem-Pole PFC Converter Using D-mode (normally-on) GaN HEMTs Romain Monthéard, CEA Tech, FRANCE

Abstract- This paper presents the design and realization of a totem-pole PFC converter featuring D-

mode (normally-on) GaN on Silicon 650 V power transistors. The presented converter takes full

advantage of these power devices while ensuring safe operation and exhibits state-of-the-art

performance.

229 Analysis and Assessment of Temperature Effect of an Open Loop Active Gate Voltage Control in GaN Transistor During Turn-ON and Turn-OFF.

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Mamadou Lamine BEYE, Universitãt Lyon, INSA Lyon, FRANCE Mogniotte Jean-Francois, UniversitãtLyon, INSA Lyon, FRANCE Luong-Viet Phung, Universitãt Lyon, INSA Lyon, FRANCE Nadir Idir, Univ. Lille, Arts Et Metiers Paristech, Centrale Lille, FRANCE Hassan Maher, Universitãt Sherbrooke, CANADA Bruno Allard, Universitã© Lyon, INSA Lyon, Universitãt Claude Bernard, FRANCE

Abstract—This paper assesses the effect of the temperature on an open loop control of Active Gate

Voltage Control (AGVC) during turn-on and turn-off of GaN HEMTs in order to reduce current or

voltage switching speed. For the turn-on, two parameters (Vint, Tint) are used to reduce the current

transient speed while for the turn-off three parameters (T0, Vint0, Tint0) are used to adjust the voltage

transient speed. Initially, the temperature effect of the parameters is assessed using the static

characteristics of GaN-HEMT and then experimentally verified. The results demonstrate the

degradation of the AGVC operation with the increase in temperature. This degradation is due to a

variation of the transistor threshold voltage and a decrease in current capability with temperature.

The temperature affects the turn-on more than the turn-off.

238 Assessment of Sliding Mode Observer in Sensorless Control of Switched Reluctance Motors Najib Kabir Dankadai, Newcastle University, UNITED KINGDOM Mohammed Elgendy, Newcastle University, UNITED KINGDOM Stephen Mcdonald, Newcastle University, UNITED KINGDOM Dave Atkinson, Newcastle University, UNITED KINGDOM

Abstract-Several studies have proved that sensorless control methods can improve the overall

robustness and costs of a drive while maintaining the desired performance. However, the general

approach of these sensorless strategies involves flux estimation which is significantly affected by the

uncertainties associated with the machine’s terminal measurement errors and noise. In this paper, a

simple robust sensorless control of Switched Reluctance Machine (SRM) is described. The inherent

robustness to parameter variations and measurement noise coupled with the high stability and simple

computation of a Sliding Mode Observer (SMO) is utilized to eliminate the errors often involved in a

fluxlinkage based position estimation for the SRM. The proposed method is tested under different

operating conditions. Results obtained show that it is reliable and less susceptible to errors and noise

commonly found in sensorless control of SRM. The method was also found to handle the model

uncertainties associated with the approximated model used for the estimation but with reduced

performance at low speed.

255 Investigation of Dynamic Voltage Restorers with Match Inductor Applied in Four-Wire Systems Samuel Junior, Federal University of Campina Grande, BRAZIL Edgard Fabricio, Federal Institute of Para´ıba, BRAZIL Gregory Carlos, Federal Institute of Alagoas, BRAZIL Cursino Jacobina, Federal University of Campina Grande, BRAZIL Nady Rocha, Federal University of Para´ıba, BRAZIL

Abstract—This paper investigates topologies of dynamic voltage restores (DVRs) based on the open-

end winding (OEW) concept applied in the three-phase four-wired systems. Additionally, an

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investigation with more details of the zero-sequence compensation limits is introduced. Such a study

is considered when the topologies operate with (or not) additional legs and a match inductor in the

fourth-branch. The addition of a match inductor contributes to optimize the synthesized output

voltage by the converter, as well as to reduce the harmonic distortion content. As a consequence, the

output passive filters can be neglected or have a reduced size. Simulation and experimental results

are presented for validation purposes.

252 Wide Frequency PCB Circuit Model Base On Impedance Characteristic for Electromagnetic

Noise Prediction Xie Jingyi, Fuzhou University, CHINA Wei Chen, Fuzhou University, CHINA Mou He, Fuzhou University, CHINA Qingbin Chen, Fuzhou University, CHINA

Abstract- EMI (Electromagnetic Interference) noise prediction technique need accurate model of each

components on PCB board, the model of PCB trace plays an important role, previous work may not

pay enough attention on it. This work proposed a circuit model which describe the PCB trace parasitic

characteristic in a wide band frequency with considerable accuracy base on Q3D simulation result,

moreover, a new the circuit parameters extract method is proposed at the same time.

260 On-Line Estimation of Electrolytic Capacitor Parameters using Recursive Least Squares and Sliding Mode Differentiators Jose Manuel Andrade, University of Derby, UNITED KINGDOM

Abstract—Electrolytic capacitors may experience a gradual deterioration that results in an increase in the equivalent series resistance (ESR) and a decrease in capacitance over time. An indication of the condition of a capacitor may be obtained by the on-line monitoring of these two electrical properties. In this paper, an on-line capacitor parameter estimation scheme that can be used for degradation monitoring is proposed. The approach involves the recursive least squares (RLS) algorithm with forgetting factor and robust exact differentiators based on sliding mode concepts. This scheme allows for on-line estimation of the ESR and capacitance under noisy conditions. Computer simulation results involving a DC-DC converter, provide evidence of the effectiveness of the scheme proposed in this paper.

832 Modular Multilevel Converter Modulation Technique With Fault-Tolerant Capability Tuanku Badzlin Hashfi, University of Malaya, MALAYSIA Saad Mekhilef, University of Malaya, MALAYSIA Koki Ogura, Kyushu Sangyo University, JAPAN Marizan Mubin, University of Malaya, MALAYSIA

Abstract—This study presents the improved phase disposition pulse width modulation (PDPWM)

technique control for MMCs, which is flexible for fault-tolerant capability. Fault tolerance improves

converter reliability, which is one of the important issues of half-bridge MMCs with considerable

switching devices. In this study, MMC with a fault condition has been analyzed. So, a modulation

control for the fault-tolerant method has been presented as well as described in simulation model.

The proposed method bypasses the faulty SM when the malfuntioning occurs. This method does not

produce interfere the reference signal and using only one single carrier form which reduces the

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software requirement. Simulation is contained to validate the fault-tolerant capability of the proposed

modulation strategy for MMCs.

836 An Interval Type-2 Fuzzy Based DTC of IMD Using The Hybrid Duty Ratio Control Venkatararamana Naik N, National Institute of Technology Rourkela, INDIA

Abstract-This paper provides an interval type-2 fuzzy based DTC (IT2FDTC) of the induction motor drive

(IMD) in which a hybrid duty ratio control (HDRC) technique is used to activate a two-level inverter.

Moreover, it is implemented with the help of DSPACE-1104 controller in real-time application using

2HP induction motor and compared its overall performance with a conventional proportional integral

DTC (CPIDC) using SVM technique. The IT2FDTC can be provided less torque and flux ripples with fast

dynamic performance of IMD over a CPIDTC. A three-dimensional Mamdani type-2 fuzzy controller

along with centroid method is used in IT2FDTC. Hence, the proposed method of study not only control

the gains of PI effectively, but also control the duty ratios of modulating wave to further improve the

dynamic performance and current harmonic profile of IMD.

839 Series Resonant Inverter Efficiency Improvement with Valley Switching for Dielectric

Barrier Discharges Vanesa Rueda, Université de Toulouse, Toulouse, FRANCE; Pontificia Universidad Javeriana, Bogota, COLOMBIA Andallah Diop, Université de Toulouse, Toulouse, FRANCE Rafael Diez, Pontificia Universidad Javeriana, Bogota, COLOMBIA Hubert Piquet, Université de Toulouse, Toulouse, FRANCE

Abstract—This paper presents the analysis of a Series Resonant Inverter for Dielectric Barrier

Discharge (DBD) applications, operating in discontinuous current mode. The study of different factors

that can improve the efficiency and behavior of the converter are presented. First, the implementation

of the converter is studied with two possible locations of the resonant inductance. The inductance

location can be used to decrease the stress voltage of the switching components. Additionally, the

effects of the parasitic elements are stated and the use of the Valley Switching technique to reduce

the turn-on switching losses is proposed. Experimental results are included, showing the system

improvements.

853 Reconfigurable Condition Based Maintenance (RCBM) Fault-Tolerant Motor Machine

System Yinquan Yu, East China Jiao tong University, CHINA Yen Kheng Tan, Printed Power Pte. Ltd., SINGAPORE

Abstract—The smart manufacturing CPS throughout the world, being it the I4.0, China 2025, or, FoF

drive, is so much focusing on the ability to reconfigure the system configuration smartly and

seamlessly via OTA (over the air). The legacy connections equipped in today machineries, factory

systems, manufacturing execution systems, up the ladder to even the resource planning system have

to be better interlinked, transforming towards an universal dimension in which able to achieve the

ultimate benefits of each sub system being designed for its own purpose. At the machine layer,

vibration data is an important information available at the edge of the analysis platform for (a)

knowing the condition of motors’ operations more accurately and (b) evaluating the performance of

manufacture processes more precisely. In this paper, a dynamic model of PMSM, incorporating both

electrical and mechanical domains, is adopted for the estimate of vibration and acoustic noises in a

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motor machine system. Distributed wireless sensors are introduced to sense the PMSM motor fault

signature for monitoring its operation condition. Finally, the paper presents a reconfigurable fault-

tolerant motor machine system for use in “Made in China” 2025 smart manufacturing.

Session S1 Power Semiconductor and Passive Devices I

Date/Time: 11 July 2019 Thursday / 09:00 AM – 10:40 AM

Venue: Auditorium

Chair: Yung C. Liang

30 Study on a Novel Trench LDMOS with Double Deep Trenches and Superjunction

Songnan Guo, University of Electronic Science and Technology of China, CHINA Junji Cheng, University of Electronic Science and Technology of China, CHINA Xing Bi Chen, University of Electronic Science and Technology of China, CHINA

Abstract—A novel deep-trench lateral double-diffused MOSFET (DT-LDMOS) fabricated on a silicon-

on-insulator (SOI) substrate is proposed and investigated by TCAD simulations. Different to the

previous DT-LDMOS, the proposed one features another one deep-trench to divide the previous drift

region into two separated ones on the source side. Each drift region is adjacent to a p-pillar, and

functions a little differently. One part is a structure of super-junction contributes to a decrease in the

specific on-resistance (Ron,sp). The other part is mostly devoted to introducing peak values of the

electric field for an enhancement on the breakdown voltage (BV), although it conducts electron

currents as well. The latter part also diminishes the effect of electric flux from the drain on the former

for a relatively even distribution of electric field in the super-junction. Attributed to the above aspects,

the proposed device has an improved relationship between Ron,sp and BV. According to the simulation

results, in comparison with the previous DT-LDMOS at the approximate BV of 580 V, the proposed one

obtains the Ron,sp decreased by 16% and the figure of merit (FOM, judging by BV2/Ron,sp) increased by

21%, which indicates a better electrical characteristics and breaks through the silicon limit.

54 Comprehensive Analysis of Coupled Inductors With Powder Cores Used in Interleaved Converter: Measurement, Modeling, Design Methods, and Experimental Evaluation Tatsuya Aoki, Nagoya University, JAPAN Jun Imaoka, Nagoya University, JAPAN Masayoshi Yamamoto, Nagoya University, JAPAN Kousuke Yoshimoto, Corporate Research & Development Center, JAPAN

Abstract- One of the best techniques for downsizing power converters is to use coupled inductors in

multiphase circuits. Meanwhile, from a magnetic material perspective, powder core material is well

known as an attractive magnetic material with superior features such as high saturation flux density.

However, since the relative permeability of power cores depends on the magnetic field intensity,

designing coupled inductors is difficult, and the modeling method is not well discussed in the relevant

literature. The purpose of this research is to model coupled inductors with powder cores and present

a simple magnetic design method. A model of coupled inductors is created by a novel measurement

method of the dc superimposition characteristic unique to the coupled inductor of two-phase

interleaved circuits. Furthermore, a design method based on a theoretical analysis using a magnetic

circuit model had been established. The validity and effectiveness of the proposed methods are

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confirmed from simulation and experimental tests. This research is helpful in the field of the model-

based development of coupled inductors.

100 A New Carrier Stored Trench IGBT Realizing Both Ultra Low Von and Turn-off Loss Bo Yi, University of Electronic Science and Technology of China, CHINA Moufu Kong, University of Electronic Science and Technology of China, CHINA Ping Li, University of Electronic Science and Technology of China, CHINA Junji Cheng, University of Electronic Science and Technology of China, CHINA Xingbi Chen, University of Electronic Science and Technology of China, CHINA

Abstract—A Diode-Clamped Carrier Stored Trench Insulated Gate Bipolar Transistor (DC-CS-TIGBT) is

proposed. Two series-connected diodes are implemented on the surface of the DC-CS-TIGBT to clamp

the voltage potential of the buried P layer under the trench gate. Thus, the buried P layer forms an

electric field shielding structure for the Carrier Stored (CS) layer. The voltage potential of the CS layer

is shielded at a low value which contributes to improving the doping concentration of the CS layer up

to 1×1019 cm-3. Consequently, the trade-off between on-state voltage drop (Von) and turning-off loss

(Eoff) is significantly improved and the saturation current density is reduced by 55%, which indicates

an enlarged Short-Circuit Safe Operation Area (SCSOA).

226 Performance Improvement of On-Chip Solenoid Type Power Inductors Shijun Yang, Fuzhou University, CHINA Wei Chen, Fuzhou University, CHINA Qingbin Chen, Fuzhou University, CHINA

Abstract- An on-chip solenoid type power inductor utilizing double layer laminated thin film cores with

nanogranular magnetic materials of Fe-Co-Ti-O is presented. Increments of 23% in inductance up to

500 MHz and 21% of quality factor at 100 MHz are obtained compared with usual solenoid inductor

with single layer laminated thin film core. And the L improvement is proved by simulation to be bigger

if the magnetic films have a higher permeability or thicker thickness. The influence of copper winding

thickness on DC performance is also analyzed. The results show that increasing the thickness of

winding coils within the process technology ability can effectively improve the performance of the

proposed inductor at low frequency. The coupling coefficient achieves 0.85 and can be easily adjusted

by changing the turn number of parallel windings to easily meet the requirement of circuit design.

838 Comparative Efficiency Analysis for Silicon, Silicon Carbide MOSFETs and IGBT Device for DC-DC Boost Converter Mohd Alam, Indian Institute of Technology Delhi, INDIA Kuldeep Kumar, Indian Institute of Technology Delhi, INDIA

Abstract- In present study, a comparative efficiency analysis for silicon (Si), silicon carbide (SiC)

MOSFETs and insulated gate bipolar transistor (IGBT) device based DC-DC boost converter is

performed. Owing to different gate-drive characteristics of power semiconductor devices such as Si,

SiC MOSFETs and IGBT device, different voltage levels are required to drive aforementioned devices.

In this study, a 500 W boost converter with wide input voltage range (30-72 V) and 110 V output

voltage is designed having a single gate driver circuit for Si, SiC MOSFETs and IGBT. A single gate driver

provides the gate-source (or base-emitter in case of IGBT) signal for all the devices which eliminates

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the use of separate gate driver circuit. Si MOSFET and IGBT are driven by 12 V gate-source voltage

whereas SiC MOSFET is operated by 18 V gate-to-source signal using the gate driver circuit. The

experimental study is done for the comparative efficiency analysis for Si, SiC MOSFETs and IGBT device

based converter for 20 kHz and 50 kHz switching frequencies. It is found that SiC based converter

provides highest efficiency ≈ 97.8%, whereas the lowest efficiency ≈ 94 % is for IGBT based converter

at 20 kHz switching frequency. SiC based converter gives higher efficiency because lower conduction

losses owning to lower on-state resistance as compared to Si MOSFET. Besides this, SiC application

has another advantage such as low switching losses at higher frequency resulting compact size of

converter. However, use of IGBT at higher switching frequency results in higher switching losses,

hence lower efficiency of the converter.

Session S2 Renewable Energy Technologies

Date/Time: 11 July 2019 Thursday / 09:00 AM – 10:40 AM

Venue: Room A

Chair: Nesimi Ertugrul

45 Impacts of Thermal Issues/Weather Conditions On The Operation of Grid Scale Battery Storage Systems Nesimi Ertugrul, University of Adelaide, AUSTRALIA

Abstract- Battery storage systems are becoming an integral part of the electricity network in the form

of an embedded and off-grid structure. However, the impact of internal and external thermal and

environmental factors on the operation of the BSSs are not well understood, which directly affect the

design, the setup and running cost, and the life time of the unit. This paper aims to advance the

knowledge of the BSS design, its operation and its location by understanding the real time data

gathered using a well-equipped grid scale battery storage system as it was operating in an

autonomous microgrid configuration in a distribution system. The results are presented to provide a

valuable reference for the design of similar system.

144 Load Emulation for Electrolysis Rectifiers Steffen Bintz, University of Stuttgart, GERMANY Manuel Fischer, University of Stuttgart, GERMANY Jörg Roth-Stielow, University of Stuttgart, GERMANY

Abstract - Load emulation is a power hardware in the loop approach for testing rectifiers used for

electrolysis in context of renewable energies. It enables development and testing of rectifiers without

the need of a real electrolyzer with its peripherals. The demands for the application, a modular power

electronic concept as well as a control system capable of fully reproducing the timing behavior of an

electrolyzer, are presented. The approach is validated using a simulation model and measurements

on a demonstrator circuit.

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194 Model-Free Predictive Current Control of a Multilevel Cascaded H-Bridge Inverter for Photovoltaic Systems Daniel Legrand MON-NZONGO, Fuzhou University and Pearl Electric, CHINA Paul Gistain Ipoum, Fuzhou University, CHINA Jinquan Tang, Pearl Electric, CHINA Rodolfo C. C. Flesch, Universidade Federal De Santa Catarina, BRAZIL Tao Jin, Fuzhou University, CHINA Joseph Song-Manguelle, Exxonmobil Development, UNITED STATES

Abstract- Model-based predictive current control (MBPCC) has been developed to control

photovoltaic power plant current to allow high-performance accuracy and fast dynamic responses

compared to the classical approach based on linear controllers. This type of controller also has many

drawbacks and this paper deals with two of them: the need for a good prediction model and the need

for the converter output voltage to have good closed-loop results. If MBPCC is not properly tuned, a

variation of dc-link voltage or the use of a less accurate current prediction model reduces the ability

of the controller to instantly track the current with high accuracy. To avoid such problems, model-free

predictive current control (MFPCC) has been proposed only for two-level inverters up to date.

However, it is known that it provides a reduced power quality compared to multilevel inverters for

medium-voltage applications. To design an MFPCC to multilevel-VSI the challenge of stagnant

conducting current which increases with respect to the number of levels in an inverter must be solved

first. In this paper, a model-free predictive control based on extended adjacent states is proposed to

control the grid current with a multilevel inverter. Through simulation results, a good tradeoff

between current THD, CMV and switching frequency especially under parameter variations is obtained.

32 Control and Operation of Multifunctional DSTATCOM With Battery-Supercapacitor Energy Storage System Nafih Muhammad Ismail, Indian Institute of Technology Madras, INDIA Mahesh Kumar Mishra, Indian Institute of Technology Madras, INDIA

Abstract—The conventional multifunctional DSTATCOM has a compensation limitation as it cannot

compensate deep voltage sag and swell. To overcome this, a new configuration of multifunctional

DSTATCOM is proposed in this paper. The proposed system consists of a voltage source inverter (VSI)

and battery-supercapacitor energy storage system which is connected to the DC link through DC/DC

converters. The proposed multifunctional DSTATCOM has all the advantages of a conventional

multifunctional DSTATCOM. Moreover, it can mitigate deep voltage sag, swell and interruption. The

battery-supercapacitor energy storage system delivers power to the load during deep voltage sag,

swell and interruption, known as uninterruptible power supply mode (UPS). Battery delivers average

load power during UPS mode, while grid is disconnected from the system and supercapacitor delivers

all the load fluctuating power. The supercapacitor also delivers the fluctuating power during normal

operation. This helps to improve the DC link voltage dynamics during sudden changes in source voltage

and load power. The performance of the proposed hybrid DSTATCOM with battery-supercapacitor

energy storage system has been verified through simulation studies.

Session S3 Modelling and Simulations I

23

Date/Time: 11 July 2019 Thursday / 09:00 AM – 10:40 AM

Venue: Room B

Chair: Toshihiko Noguchi

7 Pure Sinusoidal Output Current-Source Inverter Using New Current Waveform Generation

Technique Eka Rakhman Priandana, Shizuoka University, JAPAN Toshihiko Noguchi, Shizuoka University, JAPAN

Abstract-A novel technique which is able to generate a pure sinusoidal output current waveform for

the single-phase current-source inverter is proposed in this paper. The proposed technique

incorporates a staircase multilevel current waveform generator and a class-D amplifier-based linear

compensating current waveform generator. This linear compensating current is superimposed onto

the staircase current waveform in order to reform the output current to a pure sinusoidal waveform.

All generated dc link currents are maintained by sensing the load voltage. Therefore, regardless of

the load condition, the output current waveform is always constructed on the same number of levels.

As a result, the proposed system has efficiency up to 90% and less than 2% output total harmonic

distortion without using large output capacitor filter according to computer simulation.

121 Variable Structure Control for Three Phase-Three Wire Nine Switch Converter With LCL Filter Nalla Lokesh, Indian Institute of Technology Madras, Chennai, INDIA Mahesh K Mishra, Indian Institute of Technology Madras, Chennai, INDIA Nafih Muhammad Ismail, Indian Institute of Technology Madras, Chennai, INDIA

Abstract—In this paper, variable structure control (VSC) with quasi-sliding mode for reduced

chattering is proposed for voltage controlled three phase-three wire nine switch converter (NSC) with

LCL filter. The NSC is used in general to replace the two independent three phase power converters

for the independent control of two sets of three phase voltages with different amplitude, frequency

and phase shift. The modelling of the proposed system is done with the detailed explanation for the

selection of an extra degree of freedom. The decoupling approach is used to structure the sliding

surfaces from which the switching methodologies are developed to make system to track references.

The effectiveness of the reference tracking is validated through simulation studies.

193 Capacitor Voltage Optimation Balance Control for Modular Multilevel Converter Based On Carrier Phase-Shift Modulation Yitong Zhao, Taiyuan University of Technology, CHINA Runquan Meng, Taiyuan University of Technology, CHINA Xiaoqing Han, Taiyuan University of Technology, CHINA Peng Wang, Taiyuan University of Technology, CHINA Huipeng Li, Grid State Electric Power Research Institute of Shanxi Province, CHINA Yizhao Liu, Grid State Electric Power Research Institute of Shanxi Province, CHINA Chunguang Ren, Taiyuan University of Technology, CHINA

24

Abstract—Modular Multilevel Converter (MMC) is a promising converter in the medium or high

voltage application fields. However, once the capacitor voltage is not equal between different

submodules, it is easy to cause inter-phase circulating current among the bridge arms, which may

result in the imbalance of the three-phase currents. The traditional capacitance voltage balance

strategy is often based on NLM modulation, which may cause higher switching frequency and large

harmonics. In this paper, a new strategy for capacitance voltage submodule equalization based on

carrier phase shift modulation is proposed. The energy distribution between the bridge arms and the

voltage balance of each submodule are realized by setting the circulation suppression coefficient.

Simulation results show that the inter-phase circulating current is suppressed, and the harmonics are

reduced by using the proposed method.

145 Design and optimization of a DC-DC converter for LEDs lighting applications

Lotfi Bouslimi, University of Carthage., TUNISIA George Zissis, Universitãt Toulouse 3 Laplace, FRANCE

Abstract-High power density and high efficiency are two main objectives of DC-DC power supplies,

which allow us to develop converters operating with minimum power dissipation and low size. The

inductors are important components, which significantly reduce the efficiency and increase the

volume of power converters. In this study, we will focus only a trade-off between the power

dissipation and the size of the inductors in order to optimize a 200W Single Ended Primary Inductor

Converter (SEPIC) used in LEDs lighting applications. A multi-objective optimization procedure is

applied in this work using the Non-dominated Sorting Genetic Algorithm (NSGA_II). The simulation

results show that the inductors power losses and the weight are significantly minimized. The obtained

results prove that the optimization method is suitable to improve the power converter efficiency.

43 Multi-Domain-Simulation-Based Development of Novel Actuators for Future Circuit Breakers Arda Tüysüz, ABB Corporate Research Center, GERMANY Thorsten Schindler, ABB Corporate Research Center, GERMANY Christian Simonidis, ABB Corporate Research Center, GERMANY Christian Reuber, ABB AG, GERMANY

Abstract - Considering the increasing demand of controlled, synchronized and monitored switching of

future power grids, electromagnetic actuation of circuit breakers is a viable alternative to the

mechanical drives widely used today. The development of electromagnetic drives for next-generation

circuit breakers requires not only a deep understanding of mechanical, electrical and magnetic

phenomena but also their interaction. Therefore, this work focusses on the multi-domain-

simulationbased development of electromagnetic actuators. A detailed description is given on how

commercially available software packages dealing with the modeling of multi-body dynamics,

electromagnetics and electronics are utilized and coupled together. Finally, the simulation results are

validated by comparing them to measurements taken on a hardware demonstrator.

Session S4 Power Semiconductor and Passive Devices II

Date/Time: 11 July 2019 Thursday / 11:00 AM – 12:40 PM

Venue: Auditorium

Chair: Ravinder Singh

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42 A Novel Fast-Switching SOI LIGBT with Anode Junction Paralleled by a Diode

Jun Huang, University of Electronic Science and Technology of China, CHINA Haimeng Huang, University of Electronic Science and Technology of China, CHINA Xingbi Chen, University of Electronic Science and Technology of China, CHINA

Abstract-The silicon-on-insulator lateral insulated gate bipolar transistor (LIGBT) exhibits an enormous

turn-off time because of a long current tail and a degraded breakdown voltage owing to the gain of

the parasitic open-base p-n-p transistor. A novel LIGBT is proposed in this paper, where the anode

junction (P-collector/N-buffer) is paralleled by a polysilicon P+/N+ diode. In the blocking state, all

electrons generated by the voltage-sustaining layer can entirely flow to the anode through the diode

without the hole injection into the drift region, which completely eliminates the function of the open-

base transistor and makes the breakdown voltage equal to that of a PN junction. In the on state, since

the built-in potential of the P-collector/N-buffer junction (Vbi) is smaller than that of the P+/N+

junction, the voltage drop of the P-collector/N-buffer junction can rapidly boost to the Vbi at low anode

current, so snapback-free can be realized. In the turn-off transient, the electron in the N-drift region

can be extracted by the diode without the hole injection, contributing to the fast-switching

characteristic. The results from TCAD simulation indicate that the current turn-off time and the turn-

off loss of the proposed device are decreased by 65.9% and 77.3%, respectively, and the breakdown

voltage is increased by 7.3%, compared with the conventional one. Furthermore, an excellent tradeoff

between the turn-off energy loss and on-state voltage is accomplished, i.e., with the identical on-state

voltage of 1.63 V, the proposed device demonstrates a huge improvement of 27.9% in turn-off energy

loss.

47 A Novel Diode-Clamped Carrier-Stored SOI Lateral Superjunction IGBT with Ultralow Turn-off Loss and Saturation Current Huan Hu, University of Electronic Science and Technology of China., CHINA Haimeng Huang, University of Electronic Science and Technology of China., CHINA Xing Bi Chen, University of Electronic Science and Technology of China., CHINA

Abstract-A novel diode-clamped carrier-stored SOI lateral superjunction IGBT is proposed and

investigated by numerical simulations. The propose LIGBT remarkably features a carrier stored layer

(n-CS) beneath the p-base region, an superjunction (SJ) layer in the drift region, a p-shield region

connected to the cathode electrode through two integrated series diodes via floating ohmic contact

(FOC) and a trench oxide embedded between the p+ and n+ anode. The heavily doping n-CS layer can

effectively reduce the on-state voltage (VON), and the pshield region eliminates the impact on the

breakdown voltage (BV) from the high doping of the n-CS (NCS). In addition, the connection between

the integrated series diodes and the p-shield region can help to achieve a quite low saturation current.

Finally, the proposed CSTBT can realized an ultralow Eoff thanks to the rapid extraction of the excess

carriers by the SJ layer. The simulation results indicate that, at the same VON, Eoff of the proposed

LTIGBT is 90% and 97% lower than those of the conventional LIGBT (LIGBT-1) and the separated

shortedanode LIGBT (LIGBT-2), respectively.

139 Using flexible ferrite Sheet to design PCB inductor for 1MHZ GaN converter taking into account thermal issues

26

CHAFI Ammar, University of Ille, FRANCE

Abstract—Inductors are required in switching power converters for energy storage. They take a large

volume compared with the other components of converters because of their small energy density.

Nowadays, the operating frequency of power converters increases to MHz range because of the fast

switching time of the new power GaN transistors. This allows to reduce the volume of the required

inductors. In this paper, a design method for PCB inductor for GaN converter is proposed. The design

approach is based on the optimization of the inductor volume taking into account the thermal issues

of the ferrite sheets used to enhance the inductance value. The required inductance value for the GaN

converter is chosen from a Losses-Volume curve. Also, an experimental method based on S-

parameters is used to characterize the inductor saturation.

110 An Ultra-Low On-resistance Triple RESURF Tri-Gate LDMOS Power Device Moufu Kong, University of Electronic Science and Technology of China, CHINA Bo Yi, University of Electronic Science and Technology of China, CHINA Xingbi Chen, University of Electronic Science and Technology of China, CHINA

Abstract-An ultra-low on-resistance triple RESURF LDMOS power device with a Tri-gate is proposed in

this paper. The proposed power device consists of a triple RESURF drift region and a 3-D Tri-gate to

achieve both lower drift region resistance and channel resistance. The simulation results show that

the proposed power device has a specific on-resistance (Ron,sp) of 9.85 mΩ•cm2 and a figure of merit

(FOM) of 4.069 ,which are reduced by more than 23% and improved by more than 30% in comparison

to those of the conventional triple RESURF LDMOS power device at the same 200V breakdown voltage

and 2.5 μm channel length, respectively.

111 Study on Accurate Thermal Modeling of Press-pack IGBT Module with Asymmetric Double-side Cooling Structure based on Structure Function Curve by Orthogonal Experimental Design Zechun Dou, Zhuzhou CRRC Times Electric Co., Ltd, CHINA

Abstract- Press-pack insulated gate bipolar transistor (PP IGBT) has been applied to large-scale Voltage

Source Converter based High Voltage Direct Current Transmission (VSC-HVDC) applications. It has a

multi-layered structure, the internal electrical and thermal contact are maintained by external

clamping force along with internal disc springs. In this paper, a finite element simulation model is

presented, which can correct the material properties and interfacial thermal resistance of the device

based on structure function curve. It obtains the structure function curve through deconvolution and

network transformation. By using Bahrami plastic contacting thermal resistance model and

orthogonal experimental design, contacting thermal resistance can be predicted and thermal model

converges rapidly, respectively. Comparison between simulated and experimental structural function

curve when FRD works in the same module has verified the thermal model.

Session S5 Static Converters and EMI/EMC

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Date/Time: 11 July 2019 Thursday / 11:00 AM – 12:40 PM

Venue: Room A

Chair: Masahito Shoyama

202 Low-Voltage Cascade Multilevel Inverter With GaN Devices for Energy Storage System

Diego Gerardo Bernal Cobaleda, Pontificia Universidad Javeriana, COLOMBIA

Abstract-A cascade multilevel inverter is designed and implemented with low-voltage transistors using

gallium nitride technology. Experimental comparison against silicon technology is performed, in terms

of total harmonic distortion and efficiency. This topology avoids direct series interconnection of

batteries, allowing the use of lithium-ion technology without battery management system. The input

of the converter consists of four 48 V Li-ion batteries and the output is single-phase 120 VRMS, 60 Hz.

217 Research on a Three Phase Single Switch Boost PFC Converter Benxin Xun, Nanjing University of Aeronautics and Astronautics, CHINA

Abstract-Power factor correction (PFC) technology plays a key role in controlling harmonic pollution

and improving power factor. In low power applications, compared with the three-phase multi-switch

PFC technology, the three-phase single-switch PFC technology has attracted people's attention owing

to its simple control and low cost. In this paper, three kinds of three-phase single-switch PFC circuits

and their characteristics were analyzed and compared briefly at first, and three-phase single-switch

Boost PFC circuit was selected as the study object. The power factor correction mechanism of the

circuit topology and fifth harmonic suppression measures were thoroughly analyzed. Parameters of a

1.5kW prototype were designed, and the power factor correction function of the circuit was verified

by simulation and experiment results.

191 Develop Common-Mode Conducted Noise Modeling Methodology With Terminal Port Theory Shuaitao Zhang, Kyushu University, JAPAN Baihua Zhang, Kyushu University, JAPAN Masahito Shoyama, Kyushu University, JAPAN

Abstract- Based on the terminal port theory, this paper has proposed a common-mode conducted

noise modeling method. Single-phase inverter is chosen as an illustrative example. The T-type model

has been supposed as the internal structure of the terminal port, according to its features of CM

impedance and the noise propagation route. The details of equivalent noise source are given and its

accuracy has been verified by comparing with the concept definition. With this model, the

effectiveness of the filter could be predicted quickly and accurately. The interaction effect between

the EMI filter and harmonic filter has also been viewed in this paper. Theoretical analysis and

experimental results are presented to verify this modeling methodology.

811 Conducted Noise Emissions of GaN based DC-DC Converters for High Voltage Gain Applications

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Bilal Ahmad, Aalto University, FINLAND Wilmar Martinez, Aalto University, FINLAND

Abstract—High step-up (HSU) boost converters have various applications in renewable energy

resources, electrical automotive industry etc. However, most of these converters have the drawback

of low power density. Therefore, a two-phase interleaved boost converter was modified to achieve

high voltage gain and also maintain the high-power density. However, for industrial applications, it is

critical for this converter to comply with electro-magnetic interference (EMI) standards. This converter

has the feature of including an extra winding and two additional diodes in interleaved boost converter.

Hence, in this paper conducted emissions of modified high voltage gain converter topology are

compared with the coupled inductor based interleaved boost converter to analyze the effect of the

topology modifications. To analyze the effectiveness of three coupled windings, this paper also

includes the comparison of emissions of HSU topology with another high voltage gain topology

(Cascaded Boost Converter). As a validation of this study, GaN prototypes were built. Experimental

results showed that in addition to switching frequency, conducted emissions also depend on the

operating modes of each converter.

Session S6 Modelling and Simulations II Date/Time: 11 July 2019 Thursday / 11:00 AM – 12:40 PM

Venue: Room B

Chair: Mahinda Vilathgamuwa

204 Common-Mode Noise Modeling and Reduction for Multi-Output Flyback Converters Lu Gao, Nanjing University of Aeronautics and Astronautics, CHINA

Abstract-Flyback converters are widely used in low power applications with wide range input and

multiple outputs. Compared with the conventional spiral wire winding transformer, the planar

transformer has smaller volume and is easier to implement flat structures for high power densities.

However, due to the larger relative area and the smaller distance between two layers, planar

transformers have larger interwinding capacitance which makes the CM noise increased significantly.

In this paper, an actual multi-output flyback converter is taken as an example. Firstly, the CM

equivalent lumped capacitance model of multi-winding planar transformer is established. The CM

noise propagation paths and the spectrum characteristics of the dual-switch and single-switch flyback

converter are analyzed and compared. An expression for the value of the cancellation capacitance is

derived. Finally, the effectiveness of the proposed method is verified by simulation and experiment.

160 Fast and Universal Semiconductor Loss Calculation Method Niklas Langmaack, Technische Universitaet Braunschweig, GERMANY Thorben Schobre, Technische Universitaet Braunschweig, GERMANY Markus Henke, Technische Universitaet Braunschweig, GERMANY

Abstract- A novel approach for fast semiconductor loss calculations is shown. It is based on an

analytical description of the individual devices’ loss terms in a half-bridge circuit and a numerical

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integration of the operating points. Therefore it combines the benefits of the analytical loss calculation

with the flexibility of a numerical circuit simulation.

162 A Three-Loop Control Method for DC Solid State Transformer Chunguang Ren, Taiyuan University of Technology, CHINA Shengwen Li, Taiyuan University of Technology, CHINA Xiangqi Meng, Taiyuan University of Technology, CHINA Xiaoqing Han, Taiyuan University of Technology, CHINA Peng Wang, Taiyuan University of Technology, CHINA Yanbing Jia, Taiyuan University of Technology, CHINA

Abstract—Aiming at the poor dynamic performance of DC solid transformer with dual-loop control, a

three-loop control method is proposed for the DC transformer to improve the system dynamic

performance. The proposed control method is implemented by introducing an output current loop to

the traditional dual-loop control system. Simulation results show the effective of the proposed

method.

212 High Performance Control Strategy for an Isolated Three-Phase Bidirectional AC/DC Converter Chunguang Ren, Taiyuan University of Technology, CHINA Yixiong Zhou, Taiyuan University of Technology, CHINA Wenping Qin, Taiyuan University of Technology, CHINA Xiaoqing Han, Taiyuan University of Technology, CHINA Peng Wang, Taiyuan University of Technology, CHINA

Abstract- This paper proposes a novel control strategy consisting of dual-phase-shifting (DPS) plus

variable frequency for front-end dual-active-bridge (DAB) and 33% pulse width modulation (PWM) for

three-phase inverter. The primary goal is to realize the linear control of output power which will

reduce the control complexity and improve dynamic response, while at the same time achieving a

high-efficiency bidirectional DAB inverter. A model has been built and tested using the proposed

strategy on MATLAB/Simulink. The simulation result verified the validity of the proposed strategy.

Session S7 Analyses and Design of Electric Machines I

Date/Time: 11 July 2019 Thursday / 13:30 PM – 15:10 PM

Venue: Room B

Chair: King Jet Tseng

6 New Mathematical Approach for Eddy Current Loss in Air-Gap-Windings in a PMSM

Martin Schmidt, Otto-Von-Guericke-Universit Magdeburg, GERMANY Roland Kasper, Otto-Von-Guericke-Universit Magdeburg, GERMANY Andreas ZÃRnig, Otto-Von-Guericke-Universit Magdeburg, GERMANY Ralf Hinzelmann, Otto-Von-Guericke Universit Magdeburg, GERMANY

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Abstract – In this paper, a new mathematical approach for calculation of Eddy Current Losses in Air-

Gap-Windings is introduced. Based on magnetic field simulations in ANSYS Maxwell of the PMSM,

developed at Otto-von-Guericke-University Magdeburg, the magnetic flux through the winding is

estimated. The calculation of the losses is realized by using differential small conductor loops

representing the flow of the eddy current inside the copper windings. The approach is validated and

compared with measured eddy current loss from two different PMSM with Air-Gap-Winding.

75 Fractional Order Controller for DVR to Mitigate Torque Pulsations of an Induction Motor during Voltage Sags Vijaya a Huchche, Ramdeobaba College of Engineering and Management, INDIA Anjali S Junghare, Visvesvaraya National Institute of Technology, INDIA Nita R Patne, Visvesvaraya National Institute of Technology, INDIA

Abstract—In this study to enhance dynamic performance of DVR, a novel and an emerging control

methodology ’fractional order PI (FO-PI) controller’ with multi-loop control scheme is proposed to

counteract the ill effects of torque peak/ pulsations of voltage sags on an Induction Motor. It is seen

that the proposed controller, which tunes five (Kp,Ki,Kd,λandµ) independent parameters, provides a

powerful and efficient framework to mitigate the effects of voltage variations on induction motor.

For fine tuning gain and order of the FO-PI controllers a MATLAB toolbox FOMCON is used here. The

simulation results show that the reliability and robustness of the DVR systems to mitigate the torque

peaks/pulsations at the fault and recovery instants of an induction motor is greatly improved using

fractional order controller. The control energy necessary to alleviate the effects of voltage sags on

induction motor for the suggested FO-PI controller is found to be lesser, ensuring energy efficiency

of the controller scheme. With FO-PI controller a reduction in time performance error indices viz.

IAE, ISE, and per-cent THD is observed as compared to the present day PI controllers.

159 Inter-Winding Coupling Effect in SRM based Integrated EV Battery Chargers Junaid Saeed, RMIT University, AUSTRALIA Mehdi Niakinezhad, RMIT University, AUSTRALIA Nuwantha Fernando, RMIT University, AUSTRALIA Liuping Wang, RMIT University, AUSTRALIA

Abstract—In this research work, the inter-winding mutual inductance of Switched Reluctance Motor

(SRM) has been investigated with reference to integrated battery chargers in Electric Vehicle (EV)

application. The inductance characteristics for each phase have been acquired via extensive

simulations in finite element modelling software. Then the obtained data has been used to implement

the SRM model in MATLAB/Simulink. The effect of mutual coupling on the operation of an integrated

EV battery charger has been studied in detail and simulation results have been presented.

192 Eddy Current Loss Measurement of Permanent Magnet Used in Permanent Magnet Synchronous Machines Nijan Yogal, Physikalisch-Technische Bundesanstalt, GERMANY Christian Lehrmann, Physikalisch-Technische Bundesanstalt, GERMANY Markus Henke, Technische Universität Braunschweig, GERMANY

Abstract- Measuring the eddy current loss of a permanent magnet (PM) in an external alternating

magnetic field of a permanent magnet synchronous machine (PMSM) is a challenging task. Knowing

the PM eddy current loss of a PMSM is very important for the safe operation of machines and for

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increasing the lifetime of machines in long-term operation. In this paper, a simple closed magnetic

circuit is used to measure the eddy current loss of the PM used in the rotor of a PMSM. The proposed

measurement method is validated by the temperature measurement method. After verifying the

initial assumptions, the measuring procedure is modeled in the 3D finite element simulation model

and the results are compared to those of the real measuring setup.

56 Scott Connection Transformer Analysis in the Railway Traction System Using the Simulation Program with Integrated Circuit Emphasis Model Wei-Tzer Huang, National Changhua University of Education, TAIWAN Hsin-Ching Chih, National Changhua University of Education, TAIWAN Kai-Chao Yao, National Changhua University of Education, TAIWAN

Abstract- It is to use the Simulation Program with Integrated Circuit Emphasis (SPICE) Model in railway

traction system simulations. There are no complex mathematical equations nor software programing

activity for derive the multiphase transformer performance waveforms. There are three railway

operation cases in the linear loading, non-linear loading and operational accident short circuit fault

for validate its application. The contribution is to propose the new multiphase power system analysis

technique in the low entry effort.

Session S8 Power Control and Reliability Date/Time: 11 July 2019 Thursday / 13:30 PM – 15:10 PM

Venue: Room A

Chair: Xin Zhang

222 Three-Phase AC To Single-Phase AC Direct Converter for Metal Hardening High-Frequency Induction Heating Applications Ryosuke Kawashima, Kobe University, JAPAN Tomokazu Mishima, Kobe University, JAPAN Chiaki Ide, Fuji Electronics Industry Co., JAPAN

Abstract—A new prototype of a soft-switching three-phase utility frequency ac to single-phase high-

frequency ac direct power converter for induction heating (IH) applications is presented in this paper.

The newly-proposed ac-ac converter features direct frequency conversion under the principle of series

resonance and soft switching operations with minimized number of bidirectional switches. The validity

of the proposed ac-ac converter is revealed by essential experimental results with a 3.5 kW-40 kHz

prototype.

55 A Dual-Loop Lyapunov-Function-Based Approach for Three-Phase Stand-alone Inverter in d-q Frame Xin Zhang, Nanyang Technological University, SINGAPORE Jinsong He, Nanyang Technological University, SINGAPORE

Abstract- This paper proposed a dual-loop strategy to control three-phase stand-alone inverter in d-q

synchronous rotating frame based on Lyapunov’ s second method, where the Lyapunov function was

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designed to signify the energy stored in filter inductor and filter capacitor. This approach successfully

solved the inherent steady-state error problem in standard Lyapunov-function based method, with

the information of inductive current and capacitive voltage. By analyzing root loci of characteristic

equations, controller parameters were accordingly tuned with fully consideration of convergence time

as well as damping ratio. Subsequently, simulation in SIMULINK verified the superiority of proposed

approach over standard Lyapunov-function based both in steady state and transient scenario. Control

hardware in the loop (HIL) system via OPAL-RT and dSPACE was further conducted to validate the

efficiency and effectiveness of proposed approach.

146 Diagnosis and Prognosis of LCL Filter in Marine Electric Propulsion Systems Subash Chandar Athikessavan, National University of Singapore, SINGAPORE Sanjib Kumar Panda, National University of Singapore, SINGAPORE Sivakumar Nadarajan, Rolls-Royce Singapore Pte. Ltd, SINGAPORE Amit Kumar Gupta, Rolls-Royce Singapore Pte. Ltd, SINGAPORE

Abstract- This paper presents an online technique to estimate the capacitance value of the LCL filter

integrated with Active Front End Rectifier (AFER) used in marine vessels or offshore drilling/oil rigs.

The proposed methodology is simple, robust and requires flux sensors in addition to the existing on-

board sensors for grid-voltages, grid- and capacitor-currents measurements. The proposed online

methodology is based on the fundamental components of inductor leakage fluxes, grid-voltages, grid-

and capacitor-currents, which estimates both inductance and capacitance of the LCL filter. Based on

the estimated values of the inductance and capacitance, a technique is proposed to estimate the

resonant frequency of the LCL filter under real-time operating condition which can be used to predict

the maintenance schedule before any catastrophic failure. The proposed technique has been validated

in a laboratory based 11.3kW marine electric propulsion test-rig for 7.7%, 10% and 14% degradation

in the capacitance value of the LCL filter under different loading conditions. The estimated capacitance

values under real-time operating condition agree with the measured values under offline conditions

for various degrees of capacitance degradation and loading conditions.

105 Design, Implementation and Comparison of Power Electronic Circuits for Current Control

through 3-axis Magnetorquer coils in a Satellite Ajinkya Ajit Phanse, College of Engineering, Pune, INDIA Atharva Vinay Karaguppi, College of Engineering, Pune, INDIA Onkar Suryakant Murkewar, College of Engineering, Pune, INDIA Madhur Nalawade, College of Engineering, Pune, INDIA Shubham Anil Thorat, College of Engineering, Pune, INDIA Onkar Ganesh Bhakare, College of Engineering, Pune, INDIA Aman Gupta, College of Engineering, Pune, INDIA

Abstract- This paper expounds different topologies for achieving precise control of current through a

solenoid coil. Various power electronic circuits with different control strategies have been

implemented. These novel topologies are aimed at achieving current control in the magnetorquer

coils in a Nanosatellite. COEPSAT-2 is a student satellite mission aimed at demonstrating propulsion

using solar sails. The magnetorquers are required to damp the angular velocities. Three topologies

have been implemented and compared based on their transient response, ripple percentage,

resolution etc. Limited literature is available on control strategies to drive a constant current through

magnetorquer coils in satellites and this paper aims at bridging this gap. The topologies presented can

be further extended to various low power applications across several industries; the current control

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in the magnetorquer of a satellite just exemplifies an application of the same. The paper presents the

power electronic topology, control strategy and the comparative analysis of two novel closed loop

topologies of current control and a popular open loop topology.

Session S9 Wide Bandgap Power Device Technologies

Date/Time: 11 July 2019 Thursday / 13:30 PM – 15:10 PM

Venue: Auditorium

Chair: Yung C. Liang

65 Experimental Comparison among SJ and SiC MOSFETs for Photovoltaic Power Converter

Applications Marco Chiado Caponet, University of Wismar, GERMANY Andreas Hein, University of Wismar, GERMANY Johannes Komesker, University of Wismar, GERMANY

Abstract-This paper presents an experimental comparison among Super Junction (SJ) MOSFETs of the

old and new generation and Silicon Carbide (SiC) MOSFET which are used in 1 kW DC to AC converter

for photovoltaic applications. For the SJ MOSFET three different power semiconductors are

investigated: one belonging to the old generation and two to the new generation. Switching

performances and challenges of using new generation of SJ MOSFETs and SiC MOSFETs are discussed.

In particular, the resulting switching trajectories as well as switching losses are investigated and

compared. It is found that the measured switching waveforms with a SJ MOSFETs of the new

generation show better performance in term of turn-on and turn off time, but the overvoltage peaks

during turn-off are higher compared to the SJ MOSFET of the old generation. SiC MOSFET shows also

good switching performance and the overvoltage peaks and oscillations are strongly reduced

compared to the SJ MOSFETs of new generation.

141 Optimising a New SiC MOSET Model’s Parameters Using FFT Analysis Ali Alhoussein, VEDECOM, FRANCE Hadi Alawieh, VEDECOM, FRANCE Zouheir Riah, IRESSEM – ESIGELEC, FRANCE Yacine AZZOUZ, IRESSEM – ESIGELEC, FRANCE

Abstract—This paper presents a new model for SiC Power MOSFETs that can predict their static and

dynamic behaviour. A fitting algorithm adjusts the new model’s parameters to reproduce

performance data of the device extracted from the datasheet. Furthermore, the FFT analysis of the

drain-source voltage is used to optimise the values of the parasitic elements and the gate resistance.

173 Hybrid Dynamic Voltage Balancing Technique for Series-Connected SiC MOSFETs Zhe Wang, Tsinghua University, CHINA Zedong Zheng, Tsinghua University, CHINA Yongdong Li, Tsinghua University, CHINA

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Abstract- It is an effective way to achieve higher-voltage switches by series connection of individual

semiconductors. However, the unequal dynamic voltage sharing is the main problem needs to be

solved, especially for the wide band gap devices with quite high switching speed. This problem can be

solved by using active gate control techniques, snubber circuits and active clamping circuits. In this

paper, a hybrid method is proposed for balancing the dynamic voltages among series-connected SiC

MOSFETs with both an active voltage clamp circuit and an optimized passive snubber. Circuit and

parameter design of the driver will be proposed and experimental results will be given to verify the

performance of the proposed circuit.

176 Ohmic contacts study of P+N diodes on (111) and (100) diamond Lya Fontaine, LAAS-CNRS, FRANCE Karine Isoird, LAAS-CNRS, FRANCE Josiane Tasselli, LAAS-CNRS, FRANCE Patrick Austin, LAAS-CNRS, FRANCE Alain Cazarrã, LAAS-CNRS, FRANCE Amine Boussadi, LSPM-CNRS, FRANCE Jocelyn Achard, LSPM-CNRS, FRANCE Marie-Amandine Pinault-Thaury, Gemac-CNRS, FRANCE

Abstract- Pseudo-vertical P+N diamond diodes are fabricated. We focused on the determination of

specific contact resistance of Tibased contacts for (111) and (100) p-type diamond layers doped

around 1019 at/cm3 using circular Transfer Length Method (cTLM). Ohmic behavior is obtained and

the variation of the specific contact resistance is discussed.

827 Enhancing Short Circuit Capability of 1.2kv Sic Power MOSFETs using a Gate-Source Shorted Si Depletion-Mode MOSFET in Series With The Source Ajit R Kanale, North Carolina State University, UNITED STATES B. Jayant Baliga, North Carolina State University, UNITED STATES

Abstract – Silicon carbide power MOSFETs are an attractive option to replace Si IGBTs in power

conversion applications to reduce switching losses. Commercially available SiC Power MOSFETs do not

have short-circuit (SC) capability matching those of Si IGBTs, thus prohibiting their use in some

applications. This paper proposes an innovative method to improve the short circuit capability of 1.2

kV SiC power MOSFETs by using a gate-source shorted Si power depletion-mode MOSFET in series

with the source electrode. Extension of the short circuit time from 4.8 s to beyond 7.5 s for a 1.2 kV

SiC power MOSFET operating at a drain bias of 800 V and gate bias of 20 V has been experimentally

demonstrated. Static and dynamic characteristics were measured to demonstrate minimal impact on

power losses.

Session S10 Distributed Generation & Smart Applications I

Date/Time: 11 July 2019 Thursday / 15:30 PM – 17:00 PM

Venue: Room A

Chair: Yen Kheng Tan

40 Sizing and Control of a Multilevel Converter for Photovoltaic Generation With Independent

Power Extraction Capabilities Per Module

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Mario González-García, Universidad Autonoma De San Luis Potosi (UASLP), MEXICO Víctor Cárdenas, Universidad Autonoma De San Luis Potosi (UASLP), MEXICO Homero Miranda, Universidad Autonoma De San Luis Potosi (UASLP), MEXICO Ricardo Alvarez-Salas, Universidad Autonoma De San Luis Potosi (UASLP), MEXICO

Abstract-This work presents the sizing and the control scheme of a modular multilevel converter for grid-connected photovoltaic generation that is capable of extracting different powers from each one of the sub-inverters, and simultaneously manage reactive power injection to the grid. With the division of the entire PV array into several equal independent subarrays and then connecting each to a module of the multilevel converter, the disadvantage of partial shading and its consequent total loss of power are removed. Conversely, the PV subarrays can deliver different powers, due to transient cloud shading, differences in ambient temperature, and even due to unequal degradation of the PV panels in the long term. The approach used to accomplish a different power extraction capability in the converter modules is based on variating the modulation indexes. The principle of operation is exposed, and then a methodology to size the dc-link voltages, number of modules, and components of the converter, based on the total power and voltage of the system, is proposed. Based on this, a control scheme is also proposed accordingly.

174 2-Stage Electric Load Forecasting Scheme for Day-Ahead CCHP Scheduling Eenjun Hwang, Korea University, KOREA Sungwoo Park, Korea University, KOREA Jihoon Moon, Korea University, KOREA

Abstract - Smart grid technology has been gaining much attention as a solution for energy shortage

and environmental pollution problems. For the deployment of the smart grid, among the various

energy systems, CCHP (Combined Cooling, Heating and Power) has attracted much attention because

it can reduce energy costs effectively by using the thermal energy generated by the power generation

process for heating and cooling. In this paper, we propose a novel 2-stage load forecasting model and

perform value-based CCHP operation scheduling based on the model. To construct our model, we first

perform an hourly load forecasting using two popular algorithms for time series forecasting, XGBoost

(Extreme Gradient Boosting) and Random Forest. And then, we combine their forecasting results using

a sliding window-based Multiple Linear Regression to reflect the energy consumption pattern more

accurately. The basic guideline of the CCHP operating schedule is to run CCHP only when using CCHP

is more economical than using the public power system. We report some of the results.

214 A Novel Single-Stage Boost Full Bridge Phase Modular Soft Switching Three-Phase AC-DC Converter with High Frequency-Link Shoya Mitsui, Kobe University, JAPAN Tomokazu Mishima, Kobe University, JAPAN

Abstract—The conventional isolated three-phase switch-mode rectifier in the ac/dc hybrid microgrid consists of a multi-stage conversion, which induces a significant power loss of power devices and passive components as well as inflexible modularity for high power systems. This paper presents a new single-stage frequency conversion phase modular three-phase ac-dc converter suitable for SST (Solid State Transformer) in an offshore wind power generation system. The operating principle of the proposed converter is described, after which the essential performances are revealed by experiment of a prototype.

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834 A Sic based 2-Level Power Converter for Shape-and-Space-Restricted Aerospace

Applications Usman Nasir, The University of Nottingham, UNITED KINGDOM

Abstract- Recent advancements in the power electronic device technologies, such as wide-band-gap

devices including SiliconCarbide (SiC) and Galium-Nitride (GaN), are acting as an enabling factor in

development of compact power electronic systems. More specifically, the concept of More Electric

Aircraft (MEA), which requires the aircraft’s pneumatic systems to be replaced by electrical systems,

can therefore greatly benefit from these emerging technologies in reduction of weight and volume of

the aircraft such that range of aircraft can be increased. Various functions of aircraft e.g. actuation

and engine-starting in MEAs are performed by power electronic converter based systems. With SiC

and GaN devices, converters with densities even up to 70kW/L are easily achievable only when the

envelope of the converter is cubical and not restricted. However, in case when a specific envelope is

provided by the aircraft manufacturer, the component selection, layout and the design of power

electronic converter to achieve high power density, within the restricted envelope, becomes

extremely challenging. This paper presents the design of a circular-shaped 17.5kW/L – 97.6% efficient-

SiC based two-level (2L) inverter for aircraft applications. Furthermore, the feasibility and design of

the converter are supported by the experimental results rated at a power of 13kW.

Session S11 Power Electronics Technologies I

Date/Time: 11 July 2019 Thursday / 15:30 PM – 17:00 PM

Venue: Auditorium

Chair: Wei-Tzer Huang

8 A Study on LLC Resonant Converter Employing Coupled Inductor to Reduce Output Current

Ripple Yong-Chul Lee, EGTRONICS Co, Ltd, KOREA Chan-Ho Kang, EGTRONICS Co, Ltd, KOREA Min-Hyuck Kang, MPS KOREA Co Ltd, KOREA Sung-Soo Hong, Kookmin University, KOREA

Abstract - In this paper, an LLC resonant converter employing two coupled inductors on the secondary

side of the converter is proposed. The conventional LLC converter exhibits serious power loss during

secondary winding of the transformer because of generation of tremendous output current ripples.

To overcome this problem, an LLC resonant converter with a current doubler as a rectifying circuit was

recently proposed. However, the current-doubler rectifying circuit requires coupled inductors with a

high coupling ratio to retain the designed resonance characteristics. Therefore, an additional

hardware filter is required at the output stage to address large output current ripple. Additional design

procedures are also necessary because the inductance component of the added filter affects the

designed resonant network. To solve this issue, an LLC resonant converter employing two coupled

inductors is proposed in this paper. Mathematical analysis shows that the proposed secondary-side

current-doubler circuit does not affect the designed resonance characteristics. The operating

principles and theoretical analyses are proven through a simulation and experiments with a 54V/28A

prototype.

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53 Electric Load Leveling Method for Green Base Station Masaki Nakamura, NTT DOCOMO, INC., JAPAN Kazuhiko Takeno, NTT DOCOMO, INC., JAPAN Masahito Shoyama, Kyushu University, JAPAN

Abstract-Reducing the power consumed by base stations is an urgent requirement. Our research

shows that it is possible to reduce electricity consumption, especially peak loads, by electric load

leveling method. This approach is implemented in the Green Power Controller, a technique developed

for the Green Base Station, which is the power system of base stations used for disaster relief and

reducing energy costs. Trials of an implemented controller confirm that the control proposal is

effective in reducing electricity consumption by suppressing the peaks in electric power consumption.

In anticipation of electricity-network liberalization and accompanying power reforms, we will consider

the role of the Green Power Controller and develop even more effective electricity rate reduction

measures.

166 Constant Voltage Control for Reverse H3I Matrix Converter and The Design of The Voltage Regulator Yiqi Zhu, Nanjing University of Aeronautics and Astronautics, CHINA Bo Zhou, Nanjing University of Aeronautics and Astronautics, CHINA Chengjia Lu, Nanjing University of Aeronautics and Astronautics, CHINA Jing Shan, Nanjing University of Aeronautics and Astronautics, CHINA Jiadan Wei, Nanjing University of Aeronautics and Astronautics, CHINA

Abstract-Operating hybrid active third-harmonic injection matrix converter (H3IMC) in reverse mode

is one of competitive choices to boost the input AC voltage, for no bulky energy storage element or

auxiliary circuit is needed. However, unlike the forward mode, proper controls of both the output and

input sides are required for reverse H3IMC. Based on the mathematical model of the reverse H3IMC

system, a double closed-loop control strategy is proposed in this paper, by which load voltage and

input current are both under control. By this strategy, satisfying load voltage and input current can be

still achieved even under light load condition, which has been proved to be difficult for reverse

traditional indirect matrix converter (IMC). For better feasibility, the design of the PI regulator for the

outer voltage loop control is included by limiting the value ranges of PI parameters Kp and Ki in this

paper. In the end, experimental results verify the validity of the proposed double closed-loop control

strategy and the range of PI parameters of the voltage loop control.

213 Model Predictive Control of Grid-Connected Voltage-Source Converters Operating as STATCOM With Unbalanced Loads Oumar Diene, Federal University of Rio De Janeiro, BRAZIL Claudionor Franscisco Nascimento, Federal University of SãO Carlos, BRAZIL Felipe De Paula Rocha, Federal University of Rio De Janeiro, BRAZIL Edson Hirokazu Watanabe, Federal University of Rio De Janeiro, BRAZIL

Abstract—Power systems are rapidly changing to a new model incorporating a wide amount of

distributed generation using renewable sources. In this new scenario grid-connected converters, such

as compensators for voltage control like STATCOM, are going to play a critical role in its operation.

Voltage-source converters (VSCs) are among the most common topology used in grid-connected

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converters. The VSCs can be also used for connecting alternative renewable energy source to grid as

a distributed generation unit. Basically, a grid-connected VSC is a three-phase three-wire converter in

which a capacitor is connected to its dc side, while its ac-side voltage is usually controlled based on a

pulse-width modulation (PWM) technique. In this paper, we propose a predictive control method,

known as finite set model predictive control (FS-MPC), for the ac-side currents. In this case the VSC is

utilized as a STATCOM in which the current is controlled to generate reactive power necessary to

adjust the grid voltage. The proposed FS-MPC control strategy is easy to implement and is suited for

balanced and unbalanced load conditions. The proposed control system is simulated in a VSC

STATCOM configuration by using MATLAB SIMULINK. The results show that the proposed method is

suitable STATCOMs operating under unbalanced load conditions.

246 PELE 4.0 - POWER ELECTRONICS EXPERIMENTS: TOWARDS LABORATORY TOOLS for TEACHING-LEARNING IMPROVEMENT Gregory A. de Almeida Carlos, FederalInstitute of Alagoas, BRAZIL Victor Ferro, FederalInstitute of Alagoas, BRAZIL Robson Lisboa, Federal Institute of Alagoas, BRAZIL Andresso da Silva, Federal University of Campina Grande, BRAZIL

Abstract—This works aims to introduce the Education 4.0 concept within real-time power electronics

experiments. Indeed, the emergence of Industry 4.0 requires that laboratory education also boost up

the current education approach to the so called education 4.0. In this way, the authors try to associate

new features in the laboratory experiments. Among them: i) Internet of things (IoT) based unit, ii)

Augmented reality unit, and iii) real-time oscilloscope (remote/local) unit. Additionally, the reuse of

electronic junk provide the possibility for limited universities or technical institutes to save the cost to

acquire new educational kits in power electronics. Some experiments with those features are

presented and briefly discussed.

Session S12 Motor Drive and Motion Control I Date/Time: 11 July 2019 Thursday / 15:30 PM – 17:00 PM

Venue: Room B

Chair: Sanjib Panda

37 Optimal Interleaved Modulation for DC-Link Loss Optimization in Six-Phase Drives

Pascal Alexander Schirmer, University of Hertfordshire, UNITED KINGDOM Daniel Glose, BMW AG, Munich, GERMANY

Abstract—The modulation of a Voltage Source Inverter (VSI) output causes losses and harmonic

voltage and current distortions on the DC-Link capacitor due to the discrete switching of the

semiconductors. The high-frequent voltage pulses on the output are digitally programmed depending

on the desired fundamental wave while additional degrees of freedom allow the optimization of the

DC-link voltage distortions. This article describes a method to reduce these distortions for a drive

topology with six phases. The topology consists of an asymmetrical six-phase machine with spatially

shifted windings by 30, a six-phase inverter with two independent sets of three-phases, a common

DC-Link capacitor and ideal current supply. The pulse pattern of every three-phase set is

independently modulated utilizing digital Space Vector Pulse-Width Modulation (SVPWM) to program

the desired fundamental wave. The independence of the two sets of drivers offers an additional

39

degree of freedom, namely the shifting of the two pulse patterns. This article shows that an optimal

shifting angle can reduce both the current and voltage-distortions significantly, which is directly

influencing lifetime and size of the DC-Link capacitor. Simulations and experimental results validated

the proposed techniques.

38 A Direct-Frequency Vector Control Method for the Wide-Range Operation of Sensorless

Induction Motors Naoto Nakamura, Kanagawa University, JAPAN

Abstract-This paper proposes a new observer that estimates the rotor flux of sensorless induction

motors for wide-range stable operation. The proposed observer has the following attractive features.

Observer gains can be designed easily and clearly based on an analysis of the observer’s characteristic

equation. The observer can estimate the rotor flux stably in both motoring and regenerating

operations for all speed ranges. The observer is highly robust against large rotor resistance variation.

Extensive experimental investigations verify that the proposed observer can operate appropriately in

both torque and speed control modes for all speed ranges that include the zero-crossing frequency.

86 Unity Power Factor Three Phase Induction Motor Drive Using Combined Extinction Angle and PWM Controlled Technique Sangita Hemant Deshmukh, RCOEM, INDIA Vinay Tukaram Barhate, RCOEM, Nagpur-440013, INDIA

Abstract- Power saved is power generated. The proposed topology is aimed at minimizing overall

power loss and improving input power factor of three phase induction motor drive at any load. Direct

AC to AC voltage control technique has been adopted. The proposed technique executes combination

of extinction angle and pulse width modulation control strategies. Combination of the technique

provides independent control over power factor and speed of the three phase induction motor.

Proposed project has introduced the four switch topology that contributes in simple control and cost

effective drive. The drive runs induction motor near unity power factor for any speed. It uses AC

freewheeling. Drive possesses applications for controlled cooling purpose in industries and power

plants. The simulation results for the proposed topology is found using MATLAB software. The

simulation results are validated with the results of the hardware model of the drive. The hardware

model with results for control circuit and power circuit is presented.

147 Inter-turn Fault Detection of Induction Machines Using the Voltage Across the Star-points of the Machine and the Source Subash Chandar Athikessavan, National University of Singapore, SINGAPORE Sanjib Kumar Panda, National University of Singapore, SINGAPORE

Abstract- This paper proposes an online improved methodology to detect the inter-turn faults in the

star-connected induction machines. The proposed methodology is based on the magnitude of

fundamental component in the voltage across the star-points of the machine and the source.

Theoretical analysis using the proposed analytical model reveal the influence of the total number of

turns/phase-winding on the low-severity inter-turn fault detection using the voltage across the star-

points of the machine and the source. The theoretical analysis has been validated experimentally for

a 2hp and 0.5hp IMs with 132 and 46 turns per phase respectively. An improved fault indicator to

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detect the inter-turn faults in different induction machines with various total number of turns per

phase has been proposed and evaluated under various loading conditions.

152 Open-Loop Validation of a decoupled model of an Induction Motor Supplied by a PWM

Inverter Daniel Legrand MON-NZONGO, Fuzhou University and Pearl Electric Co., CHINA Paul Gistain Ipoum-Ngome, Fuzhou University, CHINA Jinquan Tang, Pearl Electric Co., CHINA Rodolfo C. C. Flesch, Universidade Federal De Santa Catarina, BRAZIL Tao Jin, Fuzhou University, CHINA Joseph Song-Manguelle, Exxonmobil Development, UNITED STATES

Abstract- This paper proposes analytical expressions of a decoupled model of an induction motor

supplied by a PWM inverter for the design of synchronous-frame current regulators for electrical

drives that operate at low switching frequency (below 1 kHz) where the effects of cross-coupling terms

of the plant model cannot be compensated by the current regulators with the traditional feedforward

compensation network. The proposed approach enables the original model of the plant (motor and

PWM inverter) to be independent from these effects partially due to imaginary terms introduced by

the rotation of the synchronous-frame. This method starts by deriving an accurate expression of the

induction motor in 2×2 transfer matrix and it then introduces a linear decoupling matrix between the

linear controller to be designed and the model of the plant. Finally, a decoupled dynamic of the plant

original model is obtained and validated in open-loop (without speed and current regulators) through

simulations and experimentations.

Session S13 Distributed Generation & Smart Applications II Date/Time: 12 July 2019 Friday / 0900 AM – 10:40 AM

Venue: Room A

Chair: Kowsalya M

225 Detection of DC Arc-Faults in Battery Energy Storage Systems

Moses Kavi, Queensland University of Technolgy, AUSTRALIA Yateendra Mishra, Queensland University of Technology, AUSTRALIA Mahinda Vilathgamuwa, Queensland University of Technology, AUSTRALIA

Abstract-- This paper proposes a new DC Arc-fault Detection method in battery modules using

Decomposed Open-Close Alternating Sequence (DOCAS) based morphological filters. The proposed

method relies on the State of health, state of charge and temperature measurements from battery

management systems (BMS). The detailed electrochemical model of the battery is used, and the

proposed DC arc-fault detector identifies the existence of an arcing fault by generating spikes at its

output. The algorithm is enhanced by an adaptive threshold classifier for noise suppression. The

proposed method is tested for different types of series and parallel DC arc-faults in Battery Energy

storage systems. The simulation results demonstrate that effectiveness of the proposed method.

129 Design of An RF Power Generator for Directional Radiation in Microwave Power Transfer System Xirui Zhu, Nanjing University of Aeronautics and Astronautics, CHINA

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Abstract- This paper presents a kind of radio frequency (RF) power generator with ability of directional

radiation in microwave power transfer (MPT) system. This power generator uses quadrature

modulation which can regulate amplitude and phase as a close loop. In this paper a novel strategy for

directional radiation in the near-field of MPT system is also presented. Operation frequency is 915MHz,

output power is 15W and transmission distance is 1m. Directional radiation in MPT system requires

phase shifters in order to change the current phases about the elements in antenna array. To

compensate the insertion loss of phase shifters, the technique of quadrature modulation is used in

this power generator, which maintains the amplitude even though the phase changes. Finally, a

prototype is built to verify the theoretical analysis.

220 Current Sharing Control of Parallel Bidirectional DC-DC Converter for Energy Storage

Applications in Islanded Microgrid Kowsalya M, School of Electrical Engineering VIT University, INDIA Monica Purushotham, VIT University, INDIA

Abstract— The paper explores parallel connected bidirectional DC-DC converters for energy storage

applications in microgrid. The parallel operated bidirectional DC converter confronts with inaccurate

current sharing due to the voltage imbalance and the circulating current. The parallel DC–DC power

stage and its control in the micro grid proves to be more prominent and its efficiency is predetermined

by the factors like the minimum circulating current and voltage balance. This paper aims at achieving

accurate current sharing with a power based droop mechanism. The cynosure of the current work is

carried out in two stages involving the proposed droop mechanism and the cascaded control. Due to

the self-regulating voltage gain, bidirectional capability, the dual active bridge bidirectional DCDC

converter is chosen for the current work. The proposed droop strategy is deployed for battery fed

converters to share power irrespective of instantaneous estimation of state of charge of batteries.

This can be achieved by deriving a relation between the output power and the state of charge of

batteries and formulating a droop equation based on power. The system is simulated in the MATLAB

Simulink environment and the results were analyzed experimentally.

187 Optimal Parameter Design Methodology for Dual Active Bridge Based PET in MVDC System

You Wang, Tsinghua University, Beijing, CHINA Zedong Zheng, Tsinghua University, Beijing, CHINA Chi Li, Tsinghua University, Beijing, CHINA Lie Xu, Tsinghua University, Beijing, CHINA

Abstract- Medium voltage DC (MVDC) system has been receiving more interest nowadays, and dual

active bridge (DAB) based input-series-output-parallel (ISOP) power Electronic transformer (PET) is

considered to be a suitable choice for its advantages of high flexibility, high modularity, symmetry and

soft-switching capabilities. In order to improve the performance of the DAB based PET in MVDC

systems, the paper proposes an optimal parameter design methodology for DAB based PET

considering the possible extreme situations that may occur in MVDC systems. In the optimization,

peak current value is taken as the major optimal target, and the relationship of peak current value and

the design parameters are discussed in detail. Simulations are done to validate the feasibility of the

methodology.

Session S14 Power Electronics Technologies II

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Date/Time: 12 July 2019 Friday / 0900 AM – 10:40 AM

Venue: Auditorium

Chair: King J. Tseng 118 Design and Simulation of a Three-Phase Switching Synchronous Buck Regulator

Nour Sultan Gammoh, Princess Sumaya University for Technology, JORDAN Mariana Awni Albader, Princess Sumaya University for Technology, JORDAN Hani Ahmad, Princess Sumaya University for Technology, JORDAN

Abstract— Single-phase buck converters are widely used for applications that require DC-DC, low

voltage conversion. These types of converters suffer from high ripple at the output voltage and current,

with a non-optimal efficiency and power dissipation. This work demonstrates a three phase

synchronous buck converter utilizing a difference-amplifier-based compensator in the feedback loop.

Starting from the uncompensated loop and rather than using standard type II or type III controller

topologies, a compensator is built from scratch using a difference amplifier with series and parallel

combinations of resistors and capacitors. In addition, a common compensator and Pulse Width

Modulation (PWM) are used for all three phases in the feedback loop. A 300mA transient current was

introduced at 100µs to test the ability of the controller to regulate the voltage to its average value

when the output was changed. The system behaved well with worst case output voltage spike with a

response of 24mV. Moreover, an efficiency of 89.9 %, quiescent current of 102.03µA and 1.63mVp-p

of output voltage ripple were achieved. From the source voltage 3.3V, an output regulated voltage

2.5V is obtained.

132 Modular Power Electronics for Electric Vehicles and Aviation Applications Niklas Langmaack, Technische Universitaet Braunschweig, GERMANY Guenter Tareilus, Technische Universitaet Braunschweig, GERMANY Markus Henke, Technische Universitaet Braunschweig, GERMANY

Abstract- The development of power electronics for mobile applications like electric vehicles and

aircraft is driven by strict requirements in terms of component weight and system power density.

Particularly in aviation applications, weight is decisive for the fuel consumption of the aircraft.

Therefore, for the design of power electronic systems a holistic approach is necessary, which requires

new procedures on component level as well as on controller level. One way to meet these

requirements is the use of efficient power semiconductor devices like silicon carbide MOSFETs or

gallium nitride HEMTs. This technology reduces losses and cooling efforts by efficient operation

characteristics and optimizes the system with regard to the required filter components. The technical

approaches presented in this paper will further help to design power electronic systems with high

power density and low weight and ideally support fast switching power semiconductor devices.

235 2D Decentralized Interleaving Principle for Multicell Serial-Parallel Converters Quoc Dung PHAN, HCM City University of Technology, VNU-HCM, VIETNAM Guillaume GATEAU, LAPLACE, Université de Toulouse, CNRS, INPT, UPS, France Minh Thien NGUYEN, HCM City University of Technology, VNU-HCM, VIETNAM Marc COUSINEAU, LAPLACE, Université de Toulouse, CNRS, INPT, UPS, France

43

Abstract- This paper proposes a 2-Dimension decentralized interleaving principle for a multicell serial-

parallel converter with serial and parallel associations of switching-cells using phase-shifted carriers

(PSPWM). Each cell of the converter synchronizes and regulates simultaneously its own carrier angle

in two dimensions based on the information of neighboring serial and parallel cells. Unlike the

principle using local interconnections with the two neighboring independent elementary controllers

in the conventional decentralized control method, this proposed 2D approach offers a faster response

to interleave the PSPWM control signals of a multicell serial-parallel converter presenting a large

number of cells, especially when a dynamic reconfiguration of the system is required.

249 Optimal Design Methodology of Bidirectional Dual Active Bridge Series Resonant DC/DC Converter Shien Wang, Tsinghua University, CHINA

Abstract-This paper presents an accurate frequency model of dual active bridge series resonant DC/DC

converter. Different from the conventional first harmonic approximation method, this steady-state

model considers all the harmonic components, which gives accurate expression of transfer power and

resonant current. Then strict soft switching criterion can be derived with precise mathematical

calculation. On top of that, a converter loss model is derived, and then the total loss is optimized by

particle swarm optimization to obtain the optimal parameters. A 1000-W laboratory prototype was

set up to verify the analysis.

104 Automatic Current Sharing of Input-Parallel Output-parallel Dual Active Bridge Converters

With Coupled Inductors Jiye Liu, Tsinghua University, CHINA Zedong Zheng, Tsinghua University, CHINA Kui Wang, Tsinghua University, CHINA Yongdong Li, Tsinghua University, CHINA

Abstract-Input-parallel output-parallel Dual Active Bridge converters are suitable for high current

application with bidirectional power flow. However, parameter mismatch causes the current

imbalance among the parallel modules, which leads to imbalanced loss dissipation and decreases the

system capacity. This paper proposes an automatic current-sharing method for input-parallel output-

parallel Dual Active Bridge converters using coupled inductors without using any current sensors or

digital algorithm. The current-sharing method is analyzed in detail to derive the quantitative relation

between current-sharing performance and the coupled inductance. Design consideration of the

coupled inductor is also presented to show its easy implementation. Experimental results verified that

the current-sharing is achieved both at steady and dynamic operations. The overall efficiency of the

IPOP converter is also increased by returning part of the parallel module at light load.

Session S15 Motor Drive and Motion Control II

Date/Time: 12 July 2019 Friday / 0900 AM – 10:40 AM

Venue: Room B

Chair: Philipp Kappes

131 Self-Sensing Control of a Synchronous-Reluctance Motor with an Inverter Output Filter

using the Extended Electromotive Force (eEMF)

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Philipp Kappes, Technische Universität Darmstadt, GERMANY Florian Müller, Technische Universität Darmstadt, GERMANY Gerd Griepentrog, Technische Universität Darmstadt, GERMANY

Abstract—Thefocusofthispaperistheself-sensingcontrolofa Synchronous-Reluctance Motor (SynRM)

equipped with a motor output filter using the principle of extended electromotive force. The system

considers inverter output current measurements only, the motor input currents and voltages, utilized

for the self-sensing and the cascaded control, are estimated by means of reduced observer

compensating the influence of the filter. The algorithms are implemented on a test-bench.

133 Flux Linkage Adaptive Direct Torque Control of Permanent Magnet Synchronous Motor

R. M. Wang, Nanjing Normal University, CHINA J. F. Yang, Nanjing Normal University, CHINA F. F. Bu, Nanjing University of Aeronautics and Astronautics, CHINA Y. P. Dou, Nanjing Normal University, CHINA X. Qiu, Nanjing Normal University, CHINA Fan, Nanjing Normal University, CHINA Z. W. Wang, Nanjing Normal University, CHINA

Abstract- In this paper, a flux linkage adaptive direct torque control (DTC) method for permanent

magnet synchronous motor (PMSM) drive is investigated to increase power factor without stabilizing

stator flux at a constant value. Using this method, the stator flux linkage amplitude will be changed

adaptively according to load variation. The control system scheme and analysis model for this method

are presented and studied. A prototype PMSM is employed for the experiments under different load.

The experimental comparison between the traditional and presented methods shows that the flux

linkage adaptive DTC can improve the dynamic performance of the system and effectively increase

power factor.

136 Study on Influence of Structure Parameters on Electromagnetic Characteristics for 12/10 Flux-switching Permanent Magnet Motor W. J. Zhao, Nanjing Normal University, CHINA X. Qiu, Nanjing Normal University, CHINA F. F. Bu, Nanjing University of Aeronautics and Astronautics, CHINA J. F. Yang, Nanjing Normal University, CHINA W. X. Fan, Nanjing Normal University, CHINA

Abstract: The operating principle and electromagnetic characteristics under no-load condition of

12/10 pole flux-switching permanent magnet motor (FSPM) are studied using the finite element

analysis software in this paper. By changing the stator permanent magnet width, the rotor tooth width

and the rotor tooth height, the influence of structure parameters on the no-load electromagnetic

characteristics of FSPM is explored, which is helpful to its optimal design.

201 Rotor position, speed and acceleration estimation for salient-pole AC machines at all speed and torque ranges Amir Messali, Ecole Centrale De Nantes, FRANCE

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Abstract—In this paper, an optimized sensorless control strategy for interior permanent magnet

synchronous machine is presented based on high frequency (HF) signal injection techniques. In this

work the rotor position estimation error is extracted without going through the usually used high pass

filter, leading to reduce the cost and the complexity of implementation. Moreover, a parameter

independent tracking algorithm is proposed to estimate the rotor position based on sliding mode

theory. The proposed tracking algorithm uses only the sign of the rotor position estimation error

instead of the rotor itself. Simulation results are presented according to an electrical propulsion

benchmark used in automotive applications.

223 Application Sensorless State and Efficiency Estimation for Integrated Motor Systems Gabriel Haines, The University of Adelaide, AUSTRALIA

Abstract—Efficiency is an important characteristic of motor drive systems. Efficiency improvements

can be made through the use of variable speed drives and replacing simple on-off control with more

efficient control systems. However, more advanced control typically incurs additional costs from

external sensors. Drive based sensorless estimation methods can replace these sensors and reduce

costs. Existing methods of torque estimation and pump load estimation are not able to provide

accurate estimates over the entire operating area. This paper proposes a new modelling and

estimation approach using detailed efficiency map data for an integrated motor-load system.

Experimental results are included for the general motor and pump specific cases, demonstrating the

improvements of the proposed approach.

Session S16 Analyses and Design of Electric Machines II

Date/Time: 12 July 2019 Friday / 1100 AM – 12:40 PM

Venue: Room B

Chair: Ralph Kennel

179 Design rules for Stators with Flux Barriers

Johannes Walter Gerold, FEAAM Gmbh, GERMANY

Abstract- This paper presents design rules for stators with flux barriers to increase the power density

of machines with concentrated windings while reducing the losses. The rules are used for new winding

and stator designs. The results obtained by FEM simulations reveal that the working harmonic is

increased and hence a higher power density can be achieved. To give more insights the new designs

are simulated with permanent magnets rotors and the results reveal that not only the torque is

increased but also the losses can be decreased.

182 Electric Powertrain Interior Permanent Magnet Motor Torque Ripples Reduction Over Maximum Torque-Speed Range Using Current Harmonics Injection Table Tan Pham, Altair Troy, UNITED STATES Philippe Wendling, Altair Troy, UNITED STATES Patrick Lombard, Altair Grenoble, FRANCE

46

Abstract-This paper presents a parametrized optimization with constraints mixed with a current

searching method to minimize the electric powertrain interior permanent magnet motor torque

ripples over the maximum torque-speed curve by injecting the current harmonics. The resulting

current harmonics table can thus be used as a look-up table for the motor drive controller to reduce

motor torque ripples at different torque-speed operating points.

183 Comparison of Different Approaches to Minimize Torque Ripples of a Surface Mounted Permanent Magnet Synchronous Motor Tan Pham, Altair Troy, UNITED STATES Philippe Wendling, Altair Troy, UNITED STATES Patrick Lombard, Altair Grenoble, FRANCE

Abstract-This paper presents a comparative study of different approaches to minimize the torque

ripples of an industrial brushless surface mounted permanent magnet synchronous motor. First, the

torque ripple reduction is tackled at the motor component level during the design phase by minimizing

the cogging torque and designing a sinusoidal back emf motor through a multi-objective optimization

process. Second, the torque ripples minimization is approached directly through a single objective

optimization with constraints to yield minimum torque ripples while satisfying the rated torque

requirement. And lastly, the method of producing a smooth motor running rated torque through the

adjustment of the drive current is considered. The benefits and inconveniences of each approach are

discussed with the perspective of the balance between optimum designs and production costs.

247 A Discrete-Time Model of Induction Machines Including Winding Distribution Harmonics Julien Cordier, Technische Universitaet Muenchen, GERMANY Stefan Klass, Technische Universitaet Muenchen, GERMANY Ralph Kennel, Technische Universitaet Muenchen, GERMANY

Abstract—The paper presents two strategies for discretizing a continuous-time model of induction

machines taking into account winding distribution harmonics. On the one hand numerical methods

which tend to be more accurate but also require a greater amount of computational power. On the

other, the approximation of the matrix exponential needed in the discretization process by means of

a partial sum. Despite being less precise, this approach appears more efficient and leads to a discrete-

time state-space model, an aspect particularly useful in control applications.

Session S17 Power Control and Applications Date/Time: 12 July 2019 Friday / 1100 AM – 12:40 PM

Venue: Room A

Chair: Yen Kheng Tan

12 On Extending the Overloading Capability of Modular Multilevel Converter

Nasiru Bello Kadandani, Newcastle University, UNITED KINGDOM Mohamed Dahidah, Newcastle University, UNITED KINGDOM Salaheddine Ethni, Newcastle University, UNITED KINGDOM

47

Abstract- This paper proposes a method of extending the overloading capability of a modular

multilevel converter (MMC). This is achieved by incorporating two additional control algorithms to the

converter control system. The first is added to the inner current loop for modulating the limits of the

output current as a function of the junction temperature of the power semiconductor switches and is

based on maximum utilization of the thermal headroom of the semiconductor switches of the

converter. The second is added to the capacitor voltage balancing control to regulate the thermal

stresses across the converter submodules. The entire system including the control blocks is simulated

in Simulink environment of MATLAB. Simulation results show that the MMC can sustain long term

overload when operated within the scope of its electrical and thermal operating regions and can also

provide additional short term overload when operated at the margins of these regions.

20 Study of Subsynchronous Torsional Interactions in Generator and Motor Drive Systems Using an Active Front End Converter for an LNG Plant Toshiyuki Fujii, Mitsubishi Electric Corporation, JAPAN Hiroyuki Masuda, Mitsubishi Electric Corporation, JAPAN Yoshihiro Ogashi, Mitsubishi Electric Corporation, JAPAN Kazunori Hashimura, Mitsubishi Electric Corporation, JAPAN Toshiaki Oka, Mitsubishi Electric Corporation, JAPAN

Abstract- Some applications in liquefied natural gas (LNG) plants require regenerative operation of the

converters of motor drive systems. The voltage source converter is suitable for the applications

especially in an island operation since the reactive power of the converter can be controlled

independently from the active power. Since the controller of the converter reacts to the power supply

system in an active manner, interactions between generators and converters should be considered.

In case such a plant is operated in an island operation, torsional interactions may be critical. In this

paper, subsynchronous torsional interactions (SSTI) of a generator and an active front end converter

are investigated. The results show that a damping control in the controller of the converter can

contribute to the system having positive electrical damping at the resonant frequency in the torsional

structure of the generator.

21 Particle Swarm Optimization Tuning of Modular Multilevel Converters in a Time-Invariant Framework Gilbert Bergna-Diaz, Norwegian University of Science and Technology, NORWAY Andrea Formentini, The University of Notthingham, UNITED KINGDOM Pericle Zanchetta, The University of Notthingham, UNITED KINGDOM Elisabetta Tedeschi, Norwegian University of Science and Technology, NORWAY

Abstract—This work investigates the Particle Swarm Optimization (PSO) algorithm as a tool to tune

the control parameters of a Modular Multilevel Converter (MMC) in a single-terminal HVdc

configuration. More precisely, due to its inherent capacity of handling system non-linearities, the PSO

algorithm is used to tune a nonlinear control structure based on passivity arguments capable of

ensuring global asymptotic stability of the converter. This nonlinear control strategy was successfully

applied to the MMC in previous efforts, albeit with sub-optimal tuning, and therefore below par

performance. Thus, this work aims to contribute to the state of the art by proving that system

performance under the nonlinear control structure of interest can be further improved via PSO-tuning.

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Finally, to reduce the computational burden, we propose to apply the PSO algorithm directly to a

recent state-space representation of an MMC with a constant equilibrium point.

195 Characteristic Analysis of VSC HVDC using Symmetric Coordinates Method Soo-Yeon Sim, KEPRI, Power Transmission Lab, HVDC Transmission Team, KOREA Chan-Ki Kim, KEPRI, Power Transmission Lab, HVDC Transmission Team., KOREA

Abstract-In this paper, a new analysis method of MMC HVDC system is proposed. The proposed

method is based on the symmetric coordinate method based on vector analysis and d/q

transformation method. The relationship between voltage and current on AC side, DC voltage and

current on MMC converter, and circulating current and voltage on MMC converter are analyzed by

symmetric coordinate method, this method is useful for fault analysis of MMC HVDC system and for

determination of controller structure, that is, direct method or indirect method.

106 Nonlinear Power Compensator for Remote Radio Unit

Quy Ngoc Le, Viettel Group, VIETNAM Thang Xuan Nguyen, Viettel Group, VIETNAM

Abstract- The deviation of the nonlinear gain in remote radio head produces changes in the transmit

power. This paper proposes a method to estimate the nonlinear amplifier gain of the remote radio

head without the information of temperature. A compensation method is applied to regulate the level

of transmit power by using the deviation in amplifier gain. By this method, the performance of the

Base Transceiver Station is improved without any additional hardware, which helps to lower the

manufacturing cost.

Session S18 Traction and Automotive Systems

Date/Time: 12 July 2019 Friday / 1100 AM – 12:40 PM

Venue: Auditorium

Chair: Koki Ogura

13 System design and implementation of induction generators self-excited by capacitors for

maritime diesel electric propulsion systems Shujun Zhang, Western Norway University of Applied Sciences, NORWAY Torbjørn Haugland, Norwegian Electric Systems Applied Science, NORWAY

Abstract-The paper proposes a startup and operation method of stand-alone self-excited induction

generators (SEIG) for maritime diesel electric propulsion systems. When an induction machine

operates as a generator, it needs an excitation current such that the rotating magnetic field can be

built up and maintained. The excitation current can often be obtained from either grid or shunt

capacitors. The proposed excitation mothed of SEIG is to start up the SEIG by the shunt capacitors and

continue to operate with an inverter that supplies both the excitation current to the SEIG and active

power to DC bus. The shunt capacitors are selected based on the series L-C circuit oscillation theory.

The control of the inverter is with a space vector motor control. The method is verified by a test setup

built by using commercial frequency converters. The test results show that the proposed SEIG system

can operate as required.

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234 State of Charge Based Droop Control for Coordinated Power Exchange in Low Voltage DC Nanogrids Cephas Samende, University of Oxford, UNITED KINGDOM Sivapriya Mothilal Bhagavathy, University of Oxford, UNITED KINGDOM Malcolm Mcculloch, University of Oxford, UNITED KINGDOM

Abstract— Decentralized battery and solar photovoltaic (PV) system organized in the form of an

autonomous low voltage DC nanogrid is a potentially low cost and scalable solution for electrifying

rural areas without access to the national grid. Each DC nanogrid can be installed on a single home

and used to supply basic lighting, charge mobile phones and power a television set. To provide enough

power to meet productive energy uses such as irrigation, the DC nanogrid can be connected to

neighboring DC nanogrids to form a cluster and exchange power. However, to achieve a coordinated

power exchange in the cluster, new control strategies are required. In this paper, we propose a

decentralized droop control method which uses a state of charge of the battery to coordinate the

power exchange. The power exchange is achieved by scheduling a terminal voltage set point at each

DC nanogrid based on the state of charge of the battery. The performance of the proposed method at

achieving the power exchange is analyzed through simulations in Matlab/Simulink. The method does

not require inter-unit communication. Therefore, the method is reliable, robust and scalable. Also, the

method maintains low amounts of power flow in distribution lines during power exchange to reduce

distribution line power losses.

44 A Study on High-Frequency Induction Heating System for Railway Turnout Hyeongseok Oh, Korea National University of Transportation, KOREA Geochul Jeong, Hanyang University, KOREA Chan-Bae Park, Korea National University of Transportation, KOREA Ik-Hyun Jo, Korea National University of Transportation, KOREA Hyeokbin Kwon, Korea National University of Transportation, KOREA Beomsu Kim, Korea National University of Transportation, KOREA Pil-Wan Han, Korea Electrotechnology Research Institute, KOREA Hyung-Woo Lee, Korea National University of Transportation, KOREA

Abstract-This paper focuses on high-frequency induction heating system for railway turnout. In the

existing railway industry, most of the heating systems for railway turnout use the heating wire. It

attached to the rail conducts the heat generated by the resistance directly to the rail. The heating wire,

which has been applied for a long time, is advantageous in that it is simple in construction and easy to

install. However, since it consumes a lot of power and has low heat conduction efficiency it requires a

long operation time for perfect snow melting. Therefore, the propose of this study is the IH system as

a new heating system to cope with existing heating system, and to improve electrical efficiency and

heat efficiency through the IH system. When the IH system for turnout operates, the generated

electric energy is converted into heat energy from the heating plate (SUS430), which is a component

of the heating system. On the other hand, since the conversion from electric to thermal energy has a

great influence on the heating, circuit analysis, electromagnetic field analysis and thermal analysis are

required. Therefore, this paper has suggested a high-frequency induction heating system with high

electrical and thermal efficiency to replace the conventional heating system.

150 Transformerless Onboard Charger for Electric Vehicles With 800 V Power System Niklas Langmaack, Technische Universitaet Braunschweig, GERMANY

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Guenter Tareilus, Technische Universitaet Braunschweig, GERMANY Markus Henke, Technische Universitaet Braunschweig, GERMANY Gerrit Bremer, DLR-Institut FãR Vernetzte Energiesysteme E. V., GERMANY

Abstract- The powertrains of new electric vehicles are characterized by increasing drive power and

charging power requirements. Because of increasing currents and wire cross sections the step from

400 V to 800 V power systems seems to be inevitable in the medium term. This will probably allow DC

fast charging with about 350 kW and offers some interesting possibilities for AC onboard chargers as

well. This publication describes the design of an onboard charger demonstrator for 22 kW AC charging

according to IEC 61851-1 “Mode 2”. Silicon carbide power devices and coupled filter inductors are

used in a single stage transformerless topology. This design results in a charging system with a power

density of about 7 kW/l.

209 Influence of Battery Voltage Level on Regenerative Braking Capability and Overall Efficiency of Electric Vehicles Poria Fajri, University of Nevada Reno, UNITED STATES Shoeib Heydari, University of Nevada Reno, UNITED STATES Reza Sabzehgar, University of Nevada Reno, UNITED STATES Arash Asrari, University of Nevada Reno, UNITED STATES

Abstract— This paper discusses the effect of battery voltage level on the regenerative braking

capability as well as the overall efficiency in Electric Vehicles (EVs). The performance of regenerative

braking and the system losses in EVs depend on various factors including battery voltage level. In this

study, a MATLAB/SIMULINK model of an EV powertrain and energy storage is utilized to simulate road

load conditions and to analyze the effect of different battery voltage levels on regenerative braking

capability and overall efficiency of the vehicle. The results of applying different battery voltage levels

are compared with each other from the viewpoint of energy savings as well as total ohmic losses. The

results show that ohmic losses decrease, and more energy can be harvested during brake instances

by utilizing higher battery voltage levels. The results also indicate that regenerative braking

improvements are significantly higher than the gain obtained from ohmic loss reduction.

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