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Limited wide area intelligent protection for coping with power network catastrophe

YIN Xiang-gen,WANG Yang,ZHANG Zhe,WEN Ming-hao(Electric Power Security and High Efficiency Lab,Huazhong University of Science and Technology,Wuhan 430074,China)  
In early 2008,large range blackout and severe damage of power networks were caused by the snow and ice disaster in China.New requirements of wide area protection have been put forward: besides the protection adaptability for instability incidents in large power grid,some special problems of network structure destruction caused by extreme disaster must be taken into account.Limited wide area intelligent protection provides the capability of adapting large complex power grid,coping with power network catastrophe and improving performance of power network first defending line by making use of limited wide area information and intelligent technology.Some key technologies for the protection are introduced in this paper,which impels wide area protection form conceptual exploration into applied research.
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