comparison of current grid controllers in a dg inverter ...€¦ · pi controller pr controller rt...

Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil

Comparison of Current Grid Controllers in a DGInverter with Grid Harmonic Distortion

William Caires Silva Amorim (CEFET-MG)Dayane do Carmo Mendonça (UFV)João Marcus Soares Callegari (UFV)

Matheus Pereira Silva (UFV)Heverton Augusto Pereira (UFV)

Allan Fagner Cupertino (CEFET-MG)

Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil

INTRODUCTION

Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion

Distributed Power Generation

Nonlinear Loads: Distortion in the Grid

Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil

Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion

How to minimize the impact of the presence of nonlinear loads in the grid?

PI Controller PR Controller RT Controller

Filters

Controllers

Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil

METHODOLOGY - Single-phase DG Inverter System

Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion

Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil

METHODOLOGY – Control Strategy

Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion

GRID VOLTAGE PROFILE

Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil

METHODOLOGY - Implemented Loop Control

Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion

Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil

METHODOLOGY - Discretization Methods

Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion

Forward

Backward

Trapezoidal

PI Controller

PR Controller

RT Controller

Tustin pré-warping

Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil

METHODOLOGY - PWM Sinusoidal Modulation

Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion

Unipolar PWM Bipolar PWM

Hybrid PWM

Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil

METHODOLOGY – Case Study

Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion

SYSTEM PARAMETERS CONTROLLERS PARAMETERS

Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil

RESULTS – Techniques Modulations: TDD Analysis

Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion

Unipolar

Bipolar

Hybrid

Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil

RESULTS – Power Losses

Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion

Power Losses w/ Grid Harmonic Distortion Power Losses w/o Grid Harmonic Distortion

Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil

RESULTS – Controllers Response

Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion

Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil

RESULTS – Short Circuit Level

Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion

PI Controller

PR Controller

RT Controller

Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil

RESULTS – Variation of the TDD (%) with the short circuit level (ϒ)

Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion

Grid Impedance

Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil

CONCLUSION

Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion

The PR and RT controllers presents the lower power losses in Hybrid modulation;

TDD rate revealed the Hybrid modulation is a poor in grid current quality;

The short circuit analyzes presented a lower TDD varying the short circuit factor, in PR and RT controller;

The study revealed an excellent response of the PR and RT controllers in the grid energy quality, for unipolar modulation and hybrid modulation for PI controller;

Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil

ACKNOWLEDGMENT

Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion

Induscon 2018 - November 11th to 14th - São Paulo (SP) Brazil

Comparison of Current Grid Controllers in a DG Inverter with Grid Harmonic Distortion

Thank you!

Questions?!

William Caires Silva Amorim

Mestrando em Engenharia Elétrica | PPGEL/CEFET-MG

Engenheiro Eletricista | UFV

Gerência de Especialistas em Sistemas Elétricos de Potência | GESEP

E-mail: andwilliam14@hotmail.com