MODELING, ANALYSIS AND CONTROL OF STATIC VAR COMPENSATOR USING THREE-LEVEL INVERTER

3-레벨 인버터를 사용한 무효전력 보상기의 모델링, 해석 및 제어기 설계

A new static var compensator(SVC) system using three-level inverter is proposed for high voltage and high power applications. A general and simple model for the overall system is obtained using circuit DQ-transform and DC and AC analyses are achieved to characterize the open-loop system. Using the proposed model, a new control method which controls both the phase angle and modulation index of switching pattern simultaneously is suggested to provide fast response of SVC system without using independent voltage source. Finally, predicted results are verified by computer simulation.