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This paper describes a transformerless static synchronous campensator (STATCOM) system based on cascade H-bridge multilevel inverter with star configuration. It is designed not only for the dynamic and continuous compensation of the reactive power but also for the improvement of power quality of existing wind power plant. Especially, when the induction generator of wind turbine is directly connected to the grid, reactive power are occurred by exiting current. so a reactive power compensation system based on the cascade H-bridge multilevel STATCOM is proposed because the output power quality and controllability of reactive power are required by grid code in many different countries. Using various The proposed reactive power control strategy using a STATCOM is compared with the conventional scheme using fixed-size of capacitor bank through various simulation results. Multilevel inverter(멀티레벨 인버터), STATCOM(정지형 무효전력 보상장치), Cascade H-birdge(직렬접속 H-브릿지), Induction Generator(유도 발전기), Capacitor Bank(진상용 콘덴서 뱅크), Reactive power(무효전력) |
