基于多重分形谱的高压直流输电线路区内外故障识别方法

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Abstract Simulating and analyzing the internal and external fault voltage of HVDC transmission line found that the existing physical entity boundary consisted by smoothing reactor and DC filters makes high frequency component attenuated strongly. It makes the aerial mode voltage of two terminals of the line smooth in short time window when external fault occurs, while for internal fault, the transient voltage contains more high frequency components. The single-ended fault voltage is used for calculating the quality distribution probability nonuniform extent of the formulated multifractal. The nonuniform extent is less than one when external fault occurs, while for internal fault, the nonuniform extent is greater than one. Thus, the internal and external faults identification algorithm based on quality distribution probability nonuniform extent of the multifractal is proposed. Massive PSCAD simulations show the proposed method effective and reliable. It shows excellent performance of transition resistance tolerance.

Key words： HVDC multi fractal spectrum high impedance fault quality distribution probability scale exponent

Received: 09 January 2011 Published: 27 November 2013

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TM711

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http://dgjsxb.ces-transaction.com/EN/ OR http://dgjsxb.ces-transaction.com/EN/Y2013/V28/I1/251

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