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A New Control Scheme for Maintaining Balanced DC Voltages in Static Var Compensator(SVC) Using Cascade Multilevel Inverter  

Min, Wan-Ki (조선이공대학 전기과)
Min, Joon-Ki (충북대학교 전기전자공학부)
Choi, Jae-Ho (충북대학교 전기전자공학부)
Publication Information
The Transactions of the Korean Institute of Electrical Engineers P / v.54, no.4, 2005 , pp. 179-184 More about this Journal
Abstract
This paper examines the application of high voltage static var compensator(SVC) with cascade multilevel inverter which employs H-bridge inverter(HBI). A new switching scheme is developed for the SVC system. To improve the unbalanced problem of the DC capacitor voltages, the rotated switching scheme of fundamental frequency is newly used. The optimized fundamental switching pattern with low switching frequency is adapted to be suitable for high application. The selective harmonic elimination method(SHEM) allows to keep the total harmonic distortion(THD) low in the output voltage of multilevel inverter. The SVC system is modeled using the d-q transform which calculates the instantaneous reactive power. This model is used to design a controller and analyze the SVC system. Simulated and experimental results are also presented and discussed to validate the proposed schemes.
Keywords
SVC; Cascade Multilevel Inverter; HBI; Balanced DC Voltage; SHEM;
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