eto device, converter and control development 2010...eto device, converter and control development....

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PI: Dr. Alex Q. HuangGraduate Student: Qian Chen

FREEDM System Center, NCSUNov. 4 2010

[email protected]

ETO Device, Converter and Control Development

Funded in part by the Energy Storage Systems Program of the U.S. Department Of Energy through Sandia National Laboratories

http://www.ncsu.edu/

mailto:[email protected]

Future Renewable Electric Energy Delivery and Management Systems Center

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Backgrounds and Objectives

• Gen-I to Gen-III ETOs (Emitter Turn-off Thyristor) have been developed prior to 2006 by PIs at Virginia Tech and later on at NC State University

•Gen-IV (Self-powered ETO) has been the main focus of development since 2006

•In FY2009 the focus of the work is to design and develop a 10 MVA ETO STATCOM for voltage control of a 50 MW wind farm owned by Bonneville Power Administration

•In FY2010, the focus of the work is to further develop the series connection capability of Gen-IV ETO for AC breaker application.


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Self-power Emitter Turn-off Thyristor (ETO)

• Built-in self-power function• From user point of view, it is a Light Triggered

ETO• High current turn-off capability (4kA snubberless)• Built-in V,I T sensor functions• Integrated V,I,T protection functions

Gen-IV Self-power ETO (4.5kV/4kA)


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FY09 Focus: 10 MVA ETO Based STATCOM

Five-level cascade multilevel converter based on six modular ETO H-Bridge Converters

3S1S

4S

, 1dc aC

N

2HBa

2S

1HBa 1HBb 1HBc

2HBb 2HBc

3S1S

4S2S

3S1S

4S2S

3S1S

4S2S

3S1S

4S2S

3S1S

4S2S

,SN av ,SN bv ,SN cv

, 1H aR

, 2H aR

, 1H bR

, 2H bR

, 1H cR

, 2H cR

SR

SL

SR

SL

SR

SL

, 1dc bC , 1dc cC

, 2dc aC , 2dc bC , 2dc cC


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REVERSE IMPELLER

DUCT FOR 2kW HPs

DUCT FOR 1kW HP

DUCT FOR SNUBBER

DUCT FOR CLAMP

RESISTOR ARRAY

AC OUTLET

Accomplishment: Completed a mechanical and thermal design of the

converter


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Accomplishment: Developed a STATCOM Controller (co-funded by EPRI)


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FY2010 Focus: ETO based Solid State Circuit Breaker

9kV SSCB module diagram for 4.16kV, 2kA distribution line

SSCB And SSFCL Configuration

Device Series Connections are needed to reach high voltages


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Static Voltage Balance Issue Identified

Ig

1.5MGTO

Emitter MOSFET Vz=110V

Vc

D1

GateDrive

R1

D2IzIGTO-leak

Linear MOSFET

R2

Zener diode

Capacitor bank

IETO-leak

Vbus

+

_

S1

S2

Rp

Rp

V1

V2

+

_

Ileak1

RC Snubber

RC Snubber

Ileak2

ETO leak GTO leak z gI I I I− −∆ = ∆ + ∆ + ∆

(0 5 )gI mA∆ ∈ −2 2

/2 4bus bus leak

loss pV V I

P RV⋅ ∆ ≈ = ∆

4160 , 1005

20

216.3

bus

leak

p

loss

V V V VI mA

R kP W

= ∆ =∆ =

= Ω

=

ETO leakage currrent Power loss on parallel resistors


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Solution: Compensating Circuit

ETO leak GTO leak z ref

ETO leak GTO leak ref

I I I II I I

− −

− −

= + +

∆ ≈ ∆ + ∆ref g

ref g

I II I<

∆ ∆


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Static Voltage Balance:Experimental Result

Vbus

+

_

S1

S2

Rp

Rp

Vak1

+

_

Ileak1

Ileak2

VoltageProbe

VoltageProbe

Iprobe-leak1

Iprobe-leak2

Vak2

0 1000 2000 3000 40000

500

1000

1500

2000

2500

Bus Voltage (V)

Vak1

Vak2

Vak1-Vak2

Experimental conditions:

Rp: 100 kohm

Bus voltage: 300 - 4160V

Ploss: 43.2W


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Test Setup and Experimental Results

Current cut-offContinuous operation


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Summary and Conclusion

• Gen-IV devices, converters and controllers have been developed for high power applications such as the 10 MVA STATCOM

•Devices and converters designs have been delivered to SPCO

•The voltage balance issues between series connected Gen-IV ETOs are investigated, solutions are proposed and verified by experimental results.

• ETO based circuit breaker are built and tested partially.


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Future Work

• The DOE project ended September 2010.

• NCSU plans to continue the research in the following areas:

•On reducing power loss on gate drive and improve self-power performance further.

•Conduct test on ETO based circuit breaker (series connected ETOs) in AC configuration, verify fault current cut-off and self-power performance.

•Conduct test on ETO based H-bridge to verify its design and performance under continuous operating mode.

•Promoting the application and commercialization of ETO

•Provide consulting services to the Phase II SPCO StatCom Project if funded


Acknowledgements

Authors like to thank the DOE Energy Program and Dr. Imre Gyuk for supporting this projectAuthors like to thank Dr. Stan Atcitty of Sandia National Lab for managing and supporting of this project

eto device, converter and control development 2010...eto device, converter and control development....

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