이중 변환 UPS의 병렬 운전 시 외란 저감 성능 향상을 위한 정지 좌표계 상의 전향 보상 기법 류효준1 , 윤영두✝, 모재성1 , 최승철1 , 우태겸1 Feed-Forward Compensation Technique in Stationary Reference Frame for the Enhanced Disturbance Rejection Performance in Parallel Operation of Double-Conversion UPSs

 이중 변환 UPS의 병렬 운전 시 외란 저감 성능 향상을 위한 정지 좌표계 상의 전향 보상 기법 류효준1 , 윤영두✝, 모재성1 , 최승철1 , 우태겸1

 Feed-Forward Compensation Technique in Stationary Reference Frame for the Enhanced Disturbance Rejection Performance in Parallel Operation of Double-Conversion UPSs 

By Hyo-Jun Ryu1 , Young-Doo Yoon✝, Jae-Sung Mo1 , Seung-Cheol Choi1 , and Tae-Gyeom Woo1 

Abstract 

Generally, a proportional-resonant controller is used to eliminate steady-state errors during the voltage– current control of a double-conversion uninterruptible power supply (UPS) in a stationary reference frame. Additionally, the feed-forward control compensating for the load current, which can be considered a disturbance of the voltage controller, can be used to improve the disturbance rejection performance. However, during the parallel operation of UPSs, circulating current can occur between UPS modules when performing both feed-forward control and droop control because feed-forward control reduces the circulating current impedance. This study proposes a feed-forward compensation technique that considers the impedance of circulating current. An additional feed-forward compensation technique is developed to enhance the disturbance rejection performance. The validity of the proposed feed-forward compensation technique is verified by the experiment results of the parallel operation of a 500 W double-conversion UPS module.

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