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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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Keywords: 高压直流输电,多重分形谱,高阻故障,质量分布概率,标度指数

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Abstract:

对高压直流输电线路区内、区外故障进行仿真计算和分析发现由直流输电线路平波电抗器和直流滤波器构成的物理实体边界对高频分量具有很强衰减作用,使得区外接地故障的直流输电线路两端量测的故障线模电压短窗时域波形极为平滑,即高频含量低,而区内接地故障的线路两端量测的故障线模电压短窗时域波形的高频含量高。利用短时窗内线路单侧故障电压计算每次分割形成的多重分形集上各个子集的质量分布概率分布的不均匀程度α,区外故障时α小于1,区内故障时α远大于1。据此,提出了以多重分形谱中质量分布概率分布的不均匀程度作为区内外故障甄别算法。大量的PSCAD数字试验表明,该算法可靠有效,耐受高阻能力强。

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