전류 분배 특성이 향상된 드룹 방법에 관한 연구
A Study on the Droop Method with Improved Current Distribution Characteristics
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초록
다중 컨버터 모듈을 병렬 운전 시, 시스템의 신뢰성 향상을 위해 모듈 간 균등한 전력 분배가 이루어져야 한다. 본 논문에서는 기존의 드룹 제어 방법을 개선하여 전류 분배 특성이 향상된 개선된 드룹 제어 방법을 제시한다. 제안하는 방법에서는각 모듈의 전류가 설정값보다 커질 경우, 출력 전압 설정값을 상향 조정하여 모듈 간 전류 분배 특성이 개선되도록 한다. 한편, 출력 전압을 공차 범위 안에서 관리하고자 할 때, 출력 전압 설정값이 항상 상향 조정된다면 이용 가능한 제어 IC 기준값(vref)의 범위가 줄어들게 된다. 따라서 상향 조정으로 인해 모듈 간 출력 전압 설정값이 역전될 경우 하향 조정을 통해 이를해결하고자 하였다. 제안하는 방법은 2개의 부스트 컨버터 모듈로 구성된 17.5V/500mA급 프로토타입을 통해 실험으로 검증하였다.
Abstract
In parallel operation of multiple power converter modules, equal power distribution among modules shall be made toimprove the reliability of the system. In this paper, a novel droop method is proposed to present improved currentdistribution characteristics. In the proposed method, if the current in each module become greater than the currentset-point value, the output voltage set-point is raised to improve the current distribution characteristics. Meanwhile,when the output voltage is to be managed within the tolerance range, the range of the usable control IC reference value(vref) will be reduced if the output voltage setting is always raised. Thus, in case the output voltage set-point amongmodules is reversed, the downward adjustment is introduced. The proposed method was experimentally validated with a17.5V/500mA prototype of two boost converters operating in parallel.
참고문헌 (10)
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