基于IGG抗差的配电网多端行波故障定位方法

Multi-terminal Traveling Wave Fault Location Method for Distribution Network Based on IGG Robust

配电网线路长度短,且含有多层分支及架空电缆混联线路,故障点的定位极为困难。传统基于阻抗的故障定位方法应用效果不佳,行波法具有更高的精度,但易受故障条件的影响。为此提出一种基于中国科学院测量与地球物理研究所(Institute of Geodesy&Geophysics,Chinese Academy of Sciences,IGG)抗差法(以下简称IGG抗差法)的配电网多端行波故障定位方法,该方法包括两步:第1步通过网络末端测点的故障初始行波到达时间,定义与行波波速无关的R系数,并利用R系数确定故障分支;第2步利用IGG抗差法对故障位置进行精确求解,通过引入权函数对不同的测量数据赋予不同的权重,以克服行波到达时间误差带来的不利影响。PSCAD/EMTDC仿真证明该方法具有较高的定位精度,对时间误差具有强鲁棒性。

Due to short line length,multi-layer branches and hybrid lines of overhead lines and cables,it is very difficult to locate the fault points of distribution network lines.The traditional fault location method based on impedance has poor application effect,while the traveling wave method has higher accuracy but is easy to be affected by fault conditions.Therefore,this paper proposes a multi-terminal traveling wave fault location method for the distribution network based on the Institute of Geodesy&Geophysics of Chinese Academy of Sciences(IGG)robust method.The method consists of two steps.In the first step,the arrival time of the initial traveling wave is measured at the end of the network,and the R coefficient which is independent of the velocity of the traveling wave is defined,and the fault branch is determined by the R coefficient.In the second step,the IGG robust method is used to accurately solve the fault location,and the weight function is introduced to give different weights to different measurement data to overcome the adverse influence caused by the arrival time error of traveling wave.Simulation results of PSCAD/EMTDC show that the proposed method has high location accuracy and strong robustness to time errors.