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In this paper, it discovers that, by the comparison of several different methods to electric distance calculation and simulation, the electric distance between node presented by the traditional impedance method may not be accurate under big change of power; sensitivity method is well directed although with undefined physical significance. The electric distance presented by sensitivity method is more accurate and effective than that presented by the traditional impedance method from the aspects of network portioning and failure prevention for nearby wind farm. [ABSTRACT FROM AUTHOR]