전향보상 전압의 위상 변화를 통한 단독운전 검출 방법의 계통 정상 상태의 성능 평가

Abstract

This study proposes a new islanding detection method that uses the phase shift of feed–forward voltage and evaluates the performance of an existing method and the proposed method when the grid frequency changes within the allowable range under steady-state conditions. The investigated existing method, which is slip mode frequency shift (SMS), uses current phase shift to detect islanding. The SMS method supplies reactive current to the grid under this condition, but the proposed method does not generate additional reactive power because it does not depend on the current control loop. The performance in steady-state grid condition is evaluated through simulations and experiments.