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2단 DC-DC 컨버터로 구성된 배터리 에너지저장용 계통연계형 전력변환장치
박아련(Ah-Ryeon Park),김도현(Do-Hyun Kim),김경태(Kyeong-Tae Kim),한병문(Byung-Moon Han),이준영(Jun-Young Lee) 대한전기학회 2012 전기학회논문지 Vol.61 No.12
This paper proposes a new grid-tied power conditioning system for battery energy storage, which is composed of a 2-stage DC-DC converter and a PWM inverter. The 2-stage DC-DC converter is composed of an LLC resonant converter connected in cascade with a 2-quadrant hybrid-switching chopper. The LLC resonant converter operates in constant duty ratio, while the 2-quadrant hybrid-switching chopper operates in variable duty ratio for voltage regulation. The operation of proposed system was verified through theoretical analysis and computer simulations. Based on computer simulations, a hardware prototype was built and tested to confirm the technical feasibility of proposed system. The proposed system could have relatively higher efficiency and smaller size than the existing system.