입·출력 전압 변동을 고려한 3상 인터리브드 양방향 DC-DC컨버터의 전류리플 저감 기법

Abstract

This paper proposes a new method for the current ripple reduction of a 3-phase interleaved bidirectional DC-DC converter. Usually, 3-phase interleaved bidirectional DC-DC converter is used for a battery charging and discharging to reduce the battery current ripple. In V2G application a PWM AC-DC converter is used to connect the AC power grid and the 3-phase interleaved bidirectional DC-DC converter for the battery charging and discharging. In this case the magnitude of DC-link voltage has an effect on the battery current ripple magnitude. Therefore, the magnitude of the battery ripple current is analysed with the variation of battery voltage and DC-link voltage. It is found that the ripple current magnitude can be minimized by control the DC-link voltage. A 3[kW] 3-phase interleaved bidirectional DC-DC converter with PWM converter is implemented to obtain the experimental result. Simulation and experimental results show the usefulness of the proposed method. It is expected that the proposed method can be used effectively to minimize the battery ripple current of a battery application system.