전기차 충전기용 모듈형 DC/DC 컨버터의 병렬 제어 기법
Parallel Control Method of a Modular DC/DC Converter for Electric Vehicle Chargers
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초록
본 논문에서는 전기차 충전기용 모듈형 DC/DC 컨버터의 병렬 제어 기법을 제안한다. 전기차 충전기는 모듈형 컨버터를적용하여 출력 전력 용량이 증가되고 있지만, 모듈간 구성 요소의 차이, 게이트 드라이버의 지연, 센싱 오차 등에 의해 출력전류 불균형이 발생하며, 이는 전체 시스템의 효율 및 신뢰성 저하를 야기한다. 출력 전류 균등 분배를 위한 기존의 기법들은전압 강하 또는 시스템 부피 및 비용이 증가한다는 단점을 갖는다. 본 논문에서는 전류 보상 성분을 고려한 병렬 제어 기법을 적용하여 시스템의 하드웨어 변동없이 출력 전류 균등 분배를 달성한다. 시뮬레이션을 통하여 제안하는 병렬 제어 기법의성능 및 타당성을 검증한다
Abstract
This paper proposes a parallel control method of a modular DC/DC converter for electric vehicle (EV) chargers. TheEV chargers have been increasing the power capacity using modular converters. There are output current imbalancesbetween the modules, which are caused by the difference of the impedance, delay of the gate driver, and error of thesensors. The conventional strategies for the equal distribution of the output current cause the voltage drop or the highvolume and cost of the converters. Therefore, the proposed parallel control strategy effectively balances the outputcurrent of modules using a current compensation method. The proposed strategy is verified by simulations. Additionalexperimental results will be added under various conditions.
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