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《Proceedings of the CSEE》 2010-34
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Islanding Detection Method Based on Voltage Divider for Microgrid

LI Jun1,HUANG Xueliang1,CHEN Xiaohu2,XU Wen1,XIE Miao1(1.Southeast University,Nanjing 210096,Jiangsu Province,China; 2.Nanjing Institute of Technology,Nanjing 211167,Jiangsu Province,China)  
A desired islanding detection method applied to a microgrid can detect islanding within an acceptable time duration as correctly as that used in a distributed generation system;besides,it does not interfere a smooth transition from grid-connected mode to islanded mode.On this basis,an islanding detection method,which considered the characteristics of system equivalent impedance varying before and after the connection of the microgrid and the main grid,was presented.With the help of a voltage divider,the transformation from equivalent impedance variation to voltage variation near the point of common coupling(PCC) was mapped,and then the islanding status was correctly identified without complicated computation of impedance variation.The method is able to avoid negative impact on the operation stability of the microgrid.Based on these principles,two simple islanding detection circuits were designed for engineering application.Through the Matlab/Simulink simulation,the rapidity and effectivity of these principles were demonstrated.At last,some suggestions were provided for engineering application after analyzing and comparing the merits and demerits of the two circuits.
【Fund】: 江苏省“六大人才高峰”基金项目(1116000088)~~
【CateGory Index】: TM727
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