基于多端行波时差的配电网故障定位方法

针对现有配电网故障定位方法存在实现复杂、可靠性不高的问题,提出一种基于多端行波时差的配电网故障定位方法.首先,分析故障行波传输特性,提出一种配电网故障状态表达式.根据多端行波时差和双端行波原理计算故障距离理论值.将理论值代入故障状态表达式,搭建故障搜索矩阵和辅助矩阵,通过分析矩阵元素变化特征和数值状态定位故障线路.然后...

Fault location method for distribution networks based on traveling wave time difference

There are problems of complex implementation and low reliability in the existing fault location methods of a distribution network. Thus a fault location method based on multi-terminal traveling wave time difference is proposed. First, by analyzing the transmission characteristics of a fault traveling wave, a fault state expression of the distribution network is proposed. The theoretical value of the fault distance is calculated. The fault search and auxiliary matrices are built, and the change characteristics and numerical status of the matrix elements are analyzed to locate the fault line. Then the actual fault distance is calculated according to the three-terminal traveling wave method, and the influence of traveling wave velocity is eliminated. Finally, the distribution network fault model is established in Matlab/Simulink to verify the effectiveness of the location method under different fault types and transition resistances. The simulation results show that the location method has good reliability and high accuracy.This work is supported by Hebei Provincial-level Science and Technology Program (No. 20314301D).