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基于VMD和修正Hausdorff距离的谐振接地系统故障选线方法
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Abstract:
针对谐振接地系统故障选线精度不高的问题，分析暂态零序电流波形特征，提出了一种基于VMD和修正Hausdorff距离的故障选线方法。首先利用VMD方法挖掘出隐含在零序电流波形中的故障特征，解决故障线路与健全线路零序电流波形特征受噪声等因素干扰而导致误选的问题；其次通过修正Hausdorff距离计算所选本征模态函数波形间的相似度，构造不匹配度求取各馈线的不匹配度和，通过比较不匹配度和的大小来判断故障线路。仿真结果表明，所提方法在故障相角、接地电阻等因素大范围变化情况下，均能准确选线，具有抗噪能力强的优点。
In order to solve the problem of low accuracy of fault line selection in resonant grounding system, the waveform characteristics of transient zero-sequence current are analyzed, a fault line selection method based on VMD and improved Hausdorff distance is proposed. Firstly, the VMD method is used to mine the fault characteristics hidden in the zero-sequence current waveform, which is used to solve the problem of mis-selection caused by noise and other factors interfering with the zero-sequence current waveform characteristics of fault lines and sound lines. Secondly, the similarity between the selected intrinsic mode function waveforms is calculated by the modified Hausdorff distance, the mismatch degree is constructed to calculate the mismatch degree sum of each feeder, and the fault line is judged by comparing the value of sum of mismatch degrees. The simulation results show that the proposed method can accurately select lines when the fault phase angle and grounding resistance vary in a wide range, and has the advantages of strong anti-noise ability.
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