基于同步电流测量的多端直流系统故障定位

摘要

In view of poor flexibility and low reliability of existing multi-terminal DC (MTDC)transmission systems,based on the traveling wave system,this paper presents a new fault location method,which uses wavelet transform and synchronous current measurement to determine the fault location.First,faulty sections are distinguished by excluding impossible faulty sections.Then,an evaluation criterion is proposed to determine faulty lines included in all the lines of the faulty sections.Finally,linear equations are set and solved for fault start time,fault location and the time of first arrival to the detectors.Simulation results show that this approach has high precision,noise immunity and robustness to fault impedance,with high impedance robustness being its most prominent advantage.%针对现存多终端直流传输（MTDC）系统灵活性差和可靠性低的问题，提出一种新的基于行波系统故障定位方法，利用小波变换和同步电流测量来确定故障位置。首先通过排除不可能为故障的线路来区分故障区段，然后提出一种评估指标，以确定故障区段所包含的所有线路中的故障线路，最后构建并求解故障开始时间、故障位置和首次到达各个检测器时间的线性方程组。仿真结果表明，具有高精度、噪声免疫和故障阻抗鲁棒性，其中高阻抗鲁棒性是最大优势。