基于线路归一和网络解耦的配网故障测距方法

Fault distance measurement method in distribution network based on line normalization and network decoupling

针对架空-电缆混合线路、多分支线路、环形网络线路以及多端电源的配电网线路拓扑结构的故障测距难题,提出一种新颖的故障测距方法。融合配网自动化系统信息,动态重构配电网络,采用多端行波时差数组群比法识别故障区域,为便于线路网络解耦,将混合线路归一化,运用包含故障区域的网络最优路径法将复杂配网拓扑解耦为树状结构,利用基于故障区域局部双端定位的递推网络定位法,实现故障测距。仿真分析和现场工程应用证明了该方法的有效性和可靠性,故障定位精度在200 m以内。

Aiming at the fault distance measurement difficulty for the topology structure in overhead-cable hybrid line,multi-branch line,loop network line and multi-power distribution network line,a new fault distance measurement method is proposed in this paper.Fusing the power distribution network automation system information,the distribution network is dynamically reconstructed.The traveling wave arriving time difference array group ratio method is applied to identify the fault area.In order to facilitate the line network decoupling,the mixed line is normalized.The network optimal path method of fault area is used to decouple the complicated distribution network topology into the topology with tree structure.The recursive network positioning method based fault area local two end positioning is utilized to realize the fault distance measurement.The simulation analysis and field engineering application results prove the effectiveness and reliability of the proposed method.The fault positioning accuracy is within 200 meters.