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《Electric Power Automation Equipment》 2009-11
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Islanding detection method based on phase shift

HOU Meiyi,GAO Houlei,LIU Bingxu,XU Ming (School of Electric Engineering,Shandong University,Ji'nan 250061,China)  
The characteristics of phase shift method used for islanding detection of distributed synchronous generators are analyzed based on the data of dynamic simulation. A new detection method,which combines phase shift and frequency variation,is developed to improve its reliability and sensitivity. The detection principle is described in detail:two phase shift thresholds are set,the bigger one is used when the active power imbalance between distributed generator and load is large while the smaller one is used when the imbalance is small. The frequency variation is measured and combined with phase shift to form a complex criterion for islanding detection. Simulation results show that the proposed method improves sensitivity under the precondition of ensured reliability.
【CateGory Index】: TM31
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