经验模态分解奇异性检测的配电网混合线路测距方法

含架空线和电缆的配电网混合线路发生故障时，故障行波信号传播复杂，波头识别困难。提出一种分形维数与经验模态分解（EMD）奇异性检测结合的配电网混合线路单端行波测距方法。对故障产生的行波信号进行分形滤波后，利用经验模态分解方法提取出高频信号的固有模态函数（IMF），进行奇异性检测实现行波波头的准确标定，最后利用A型行波测距原理实现配电网混合线路的故障测距。PSCAD仿真结果表明，该方法具有较高的准确性和可靠性，能够有效识别出混合线路中故障点反射波和对端母线反射波，实现故障测距。

Power Distribution Network Fault Location Method Based on EMD and Singularity Analysis for Combined Lines

When fault occurs in overhead lines and cable hybrid distribution network, traveling wave signal transmis- sion is complicated and wave head recognition is difficult. In this paper,a method of single terminal fault location is proposed, it combines fractal dimension analysis and singularity detection of empirical mode decomposition （EMD）. First,fractal filters are applied. Then,intrinsic mode function （IMF） of high frequency signal are extracted by using EMD method for an accurate wave head. Finally, the type A traveling wave fault location method is used for fault location. PSCAD simulation results show that the method is highly accurate and reliable. It can effectively identify the wave head of fault ooint in the hvbrid network apart from bus reflection wave at remote end.