Gavin Abo

Nate Stout

Nathan Thomas

HydroFly

Flywheel

Hydrofly

• Two Teams– Flywheel– Fuel Cell

• Adam Lint

• Chris Cockrell

• Daniel Hubbard

Sponsors & Mentors

• Brian Johnson

• Herb Hess

• Satish Samineni

Design Review II:Final Design Review Outline

I. Introduction

II. Objectives

III. Design Functionality

IV. Schedule

V. Budget

VI. Questions

I. Introduction

Why is the project being done?

-To correct short voltage sags (a few seconds) to maintain a stable voltage to critical loads.

Why is this important?

-The shutdown of critical loads due to short voltage sags can be costly.

II. Primary Objective

• Interface a flywheel to the AMPS with the ability to correct for voltage sags occurring on the AMPS. – Implement the design by Satish Samineni

Secondary Objectives

• Spin a flywheel

• Communicate between converters

• Operate each converter with its own PWM

• Provide power to AMPS

• Operation Manual

III. Design Functionality

• Organizational Chart• Block Diagram• Overall Circuit Schematic• Sub Circuit Schematics• Programming• Assembled• Documentation• Specifications

Organizational Chart

Operate a sine–triangle PWM

scheme

Operate a space vector

PWM scheme

Provide power to AMPS

Communicate between

converters

Program the triangle wave

Program the sine wave

look up table

Spin a flywheel

Program the switching

times calculation

Program a Phase locked

loop

Program matrix math

functions

Sag Status

Interface a flywheel to AMPS to correct for voltage sags on the

system

Block Diagram

Circuit Schematic

Series Transformer Diagram

A Phase

B Phase

C Phase

Flywheel Energy Storage System

+ Vinjected -

+ Vinjected -

+ Vinjected -

So

urc

e

Lo

ad

DC link startup power supply

Generates positiveDC voltage

Generates negative DC voltage

D3D1

1 2D2

-

1 2

+

VdcD4

120Vac

-

D3

D2

1 2

Vdc

120VacD1 +

D4

1 2

The Programming

• What we have programmed– Matrix math

capabilities

– Space Vector PWM scheme

– Sag detector and corrector

• What we still have to program– Phase Locked Loop

– Modify already programmed code to work with the measured inputs

Assembled• What has been

assembled– Capacitor shorting bars

– Utility Cart

• What needs assembled– DC link charging

supply

– LEMS

– Safety Cover

– Transformer

Documentation

• Test plan– Functional test plan– Specification test plan

• Operators Manual

• Poster

SpecificationsThe AMPS 3 Phase, 208 V, 60 Hz, 5 kVASeries Transformers 110V/220VDC Bus Voltage 450 V maxDC Bus Capacitance 2 x 250V 1000 μF (grounded between the 2)Flywheel Inertia 0.911 kg-m2

Induction Machine Ratings 208 V, 32.6 A, 60 Hz, 10 hp, 4 poleSVPWM Switching Frequency 1 kHzSPWM Switching Frequency 10.8 kHzMaximum Sag Correction Duration 1.5 sMaximum Magnitude of Sag Correction 37% (or 63% of rated) @ 0.95 per unitSag Correction Response Time Within 2 cycleMagnitude Sag Correction Tolerance Within 0.95pu 0.05pu of rated2 Tier Converters 6 IGBTs 75A, JTAG (software not

included), etc.DSP Program Language C with inline ASM from TISample Rate for Voltage Correction 20k samples per cycleFlywheel Speed Sensor Position EncoderDC power supply max. ripple 50V DC

IV. Schedule

V. Budget

Quantity Item Company Unit Price SubTotal withFreight

2 DC/AC Converter Tier Electronics $1,700 $3,428.041 DSP Software Texas Instruments $495 Donated1 XDS510PP-Plus Parallel Port

EmulatorSpectrum Digital $974.25 Donated

2 1000 F Capacitors 250 V Futurlec $2.5 $81 Craftsman Utility Cart (Mfr.

model #59345)Sears (Lewiston, ID) $62.99 $62.99

1 3-Phase Transformer UI G10 Lab $240 Salvaged10 120V 20A Diodes Digi-Key $1.138 $18.59

Subtotal to Date $3517.62

1 Design Poster/Report Binding UI Commons CopyCenter

$30 $30

6 Voltage Transducer Digi-Key Corporation $37 $2226 Current Sensor Digi-Key Corporation $21 $126

Other $929.381 48 V DC 20 W Power Supply Jameco $10.95

Total Expenditures $4,825

Proposed Budget $4,825

Remaining Budget $0

http://www.ece.uidaho.edu/hydrofly/website

VI. Questions