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조준석(J.S. Cho),강병희(B.H. Kang),고재석(J.S. Gho),최규하(G.H Choe),김진흥(J.H. Kim),정석언(S.E. Chung) 전력전자학회 2001 전력전자학술대회 논문집 Vol.2001 No.7
The parallel operation system of UPS is used to increase reliability of power source at critical load. But parallel UPS system has a few defects, impedance is different from each other and circulating current occurs between UPSs, due to line impedance and parameter variation, though controlled by the same synchronization signal. According to such characteristic of parallel UPS, balanced load-sharing control is the most important technique in parallel UPS operation. In this paper, a novel power deviation compensation algorithm is proposed, it is composed of voltage controller to compensate power deviation that be calculated by using active and reactive current deviation between inverters on synchronous d-q reference frame.