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《Electric Power Automation Equipment》 2010-05
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Overview of power system wide area protection

HE Zhiqin,ZHANG Zhe,YIN Xianggen,CHEN Wei (Electric Power Security and High Efficiency Lab,Huazhong University of Science and Technology,Wuhan 430074,China)  
The existing problems of traditional protections are analyzed and the main contents involved in the study of protection based on wide-area information are reviewed,including:on-line adaptive setting,flow transfer identification and wide area backup protection based on fault component identification. The on-line setting is to adjust the protective settings to the optimal state according to the change of system operation modes,including the change of electric device on-off state and the change of generator output and loads. The flow transfer identification is to prevent the improper protective actions which may lead to cascading trips,including the comparison of transmission section active powers and adjacent branch currents before and after branch break. The wide area backup protection utilizes multiple node measurements to locate the fault component,which has easier protection setting and higher reliability than the traditional back-up protection,including the fault identification algorithm based on traditional main protection theory and the information error tolerance algorithm. A wide area protection system based on wide area back-up protection is presented for smart grid and its development trend is prospected.
【Fund】: 国家自然科学基金项目(50837002 50877031)~~
【CateGory Index】: TM771
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