一种计及MOV动作特性的串联补偿线路故障位置识别方法  

A Method to Identify Fault Location in Series-Compensated Transmission Line Considering Conductive Characteristics of Metal Oxide Varistor

作　　者：张金虎 徐振宇 杨奇逊 

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206

出　　处：《电网技术》2015年第3期856-861,共6页Power System Technology

摘　　要：串联补偿设备中的串联电容通常采用金属氧化物变阻器(metal oxide varistor,MOV)作为其主保护。MOV具有典型的非线性特征,故障后其会对串联补偿设备等值阻抗产生较大的影响。而传统基于模型参数的故障位置识别方法均未考虑故障后MOV动作特性对串联补偿设备等值阻抗的影响。根据Goldsworthy大量实验测试结论,提出了一种新的、基于模型参数的串联补偿线路故障位置识别方法。该方法从原理上计及了故障过程中MOV的动作特性对串联补偿线路阻抗的影响;而在实现过程中其又无需知道串联补偿装置的相关参数和具体工作状态,而仅通过采样值的数字运算就能得到准确的故障位置识别结果。与传统算法相比,该方法在整个故障过程中均能得到稳定的判断结果。通过EMTDC/PSCAD和MATLAB软件仿真计算验证了该方法的准确性和有效性。The metal oxide varistor （MOV） is usually used to the series capacitor in series compensation device. In view of its typical nonlinear characteristics, MOV can obviously impact on the equivalent impedance of the post-fault series compensation device. Traditional model parameter based fault location method does not consider the impact of the post-fault conductive characteristics on the equivalent impedance of series compensation device. According t~ the conclusion from a lot of experiments by Goldsworthy, a new model parameter based method to identify the fault position in series-compensated transmission line is proposed. The proposed method considers the impact of conductive characteristic of MOV on equivalent impedance of series-compensated transmission line during the fault process in principle, and in its implementation it in not necessary to know the related parameters and concrete operation condition of series compensation device, and the fault position can be accurately identified only by numerical operation of sampled values. Comparison with traditional algorithm shows that using the proposed method stable judgment results can be obtained within entire fault process. The accuracy and effectiveness of the proposed method are validated by simulation results based on EMTDC/PSCAD and MATLAB.

关 键 词：串联补偿线路 故障位置识别 金属氧化物变阻器 动作特性 

分 类 号：TM721[电气工程—电力系统及自动化]