单-多端行波组合的架空线配电网单相接地故障定位方法

摘要

As the actual complex distribution network has many branches, it is very difficult to find the fault point.A single-phase-ground fault location method based on single-terminal traveling wave and multi-terminal traveling wave is put forward in this paper.Firstly, according to the optimal allocation principle for the topology structure of the distri-bution network, there are only several location equipments are installed in distribution grid.Singular value decomposi-tion ( SVD) is applied to detect the fault travelling signals.The fault line is selected by using multi-terminal traveling wave fault line selection algorithm.On this basis, the travelling wave location device that uses wavelet graphic correla-tion method to detect the time difference of wave heads is proposed.The accuracy of fault location still can be guaran-teed even though a locating device breaks down, records the wrong time date in distribution systems.The result of simulation indicates that this algorithm has the strong fault tolerance and high fault location accuracy.%针对配电网网络结构复杂，分支多，故障定位困难，提出了一种单端、多端行波相结合的配电网单相接地故障定位方法。首先根据配电网拓扑结构，依据最优配置原则，选取需安装行波定位装置的配变终端，然后通过奇异值分解（ SVD）对故障行波信号进行检测，应用多端行波故障选线算法判别障故障线路。在此基础上，各行波定位装置采用小波波形相关性方法，检测两个相关反射波时间差进行单端行波测距。仿真结果表明，该方法在某台定位装置失灵、时间记录错误时也能实现配电网的故障准确定位，具有很强的容错性和较高的定位精度。