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Island Detection Based on OVR / OUR and Current Disturbing Combination of Grid-Connected System

SHEN Shu-xia;YU Shao-juan;LIU Li-qun;HU Wei;School of Electronic Information Engineering,Taiyuan University of Science and Technology;  
Island detection is one of the difficult problems in distributed generation research. Power grid requires that a distributed grid system must have a good ability of anti-island to ensure the stable operation of the whole system. In this study,the current amplitude disturbing was used to eliminate the blind area by OVR / OUR island detection method. This method would not affect the frequency of grid or have harmonic injection to grid,and could overcome the shortcoming that OVR / OUR island detection fails to work when the output of inverter matches load power. This method can reach non-blind detection. Simulation has proved the correctness of this method.
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