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中文摘要：
对高压直流输电线路内部、外部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的衰减作用,使得外部接地故障下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,其分形维数为1;而内部接地故障下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,其分形维数远大于1。据此,形成以单端故障线模电压的分形维数计算为基础的直流输电线路故障识别算法。大量PSCAD仿真实验表明,所提算法有效、可靠。通过对高、低阻故障下的波形特征及其盒维数计算机理的分析,揭示了所提算法具有耐受高阻能力的原因。
英文摘要：
The existing physical entity boundary consisted by smoothing reactor and DC filters makes high frequency component attenuated strongly through simulating and analyzing the internal and external fault voltage of high-voltage direct current （HVDC） transmission lines. The aerial mode voltage of two terminals of the line is smooth in short time window when external fault occurs, which makes its fractal dimension equal to one; while for internal faults, the fractal dimension is larger than one, because the transient voltage contains more high frequency components. The internal and external faults identification algorithm based on fractal dimension of the single-ended is proposed. The proposed method is proven effective and reliable through massive PSCAD simulations. The reason of proposed method having high fault resistance tolerance is analyzed by discussing waveform features on condition of various fault resistance and the mechanism of box dimension computation.
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