柔性直流输电线路双端故障定位新方法.PDF

2013 年 第 7 卷 第 4 期 南 方 电 网 技 术 高压直流输电 2013 ，Vol. 7 ，No. 4 SOUTHERN POWER SYSTEM TECHNOLOGY HVDC Transmission 文章编号：1674-0629 (2013)04-0024-05 中图分类号：TM721.1 文献标志码：A 柔性直流输电线路双端故障定位新方法 蔡新雷 （广东电网公司电力调度控制中心，广州 510060 ） 摘要：基于直流输电线路参数呈现明显的频变特性，提出了一种VSC-HVDC 直流输电线路的故障定位方法。该方法利 用两端电压、电流量分别计算沿线电压分布，并以电压分布在故障点处相等为判据进行故障定位。在频变参数模型基础 上，利用相应的线路参数计算沿线任意点电压的时域值，并分析了数据窗长度对故障定位精度的影响。仿真结果表明， 该方法可以实现全线范围内的快速准确的故障定位。 关键词：柔性直流输电；直流输电线路；故障定位；频变参数；分布参数 A New Method of Fault-Location for VSC-HVDC Transmission Lines CAI Xinlei (Guangdong Power Grid Dispatch Control Center, Guangzhou 510060, China) Abstract: According to the frequency dependent characteristics of HVDC transmission lines, this paper proposes a two terminal fault location method for VSC-HVDC transmission lines. In the method, the voltage distributions are calculated by the voltages and currents measured at local and remote convert stations, and the fault points are located according to the judgement that the voltage distributions are equal at these points. Based on frequency dependent parameter model, the voltage at any point along the line in time domain can be calculated with the corresponding line parameters, and the influence of the data window length on the fault location is analyzed. Simulation results show that with the proposed method the faults location for VSC-HVDC transmission lines can be realized quickly and accurately. Key words: VSC-HVDC; HVDC transmission line; fault location; frequency-dependent parameter; distributed parameter VSC-HVDC （Voltage Source Converter HVDC ） 1 VSC-HVDC 系统结构 在我国称为柔