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주기적 위상 변동 기법을 이용한 새로운 단독운전 검출 기법
정영석(Youngseok Jung),최재호(Jaeho Choi),소정훈(Junghoon So),유병규(Byungguy Yu),유권종(Gwonjong Yu) 대한전기학회 2006 대한전기학회 학술대회 논문집 Vol.2006 No.7
This paper proposes the optimal design method based on NDZ analysis to secure the islanding detection ability and to maintain the stability and power quality when the grid is connected. A PSiM -based model and analysis of the system is presented, specially aimed at improving the effectiveness of phase shift anti -islanding method with frequency feedback, which causes the inverter current to be generated slightly lower or higher in frequency than the frequency of the terminal voltage. The proposed method can cause frequency jump with leading and lagging phase of output current in two line cycles. As a result, the proposed algorithm is more sensitive and reliable than the conventional phase shift method. Experimental results, on a 3 ㎾ inverter connected to 220 V, 60 ㎐ utility, are discussed.