利用行波电压分布特征的柔性直流输电线路单端故障定位  

One-terminal Fault Location for HVDC Flexible Transmission Lines Based on Wave Voltage Distribution Features

作　　者：宋国兵[1] 李德坤[2] 靳东晖[1] 冉孟兵[1] 靳幸福[1] 郭润生 

机构地区：[1]西安交通大学电气工程学院,陕西省西安市710049 [2]山东电力集团公司济南供电公司,山东省济南市250012 [3]山西朔州供电分公司,山西省朔州市036002

出　　处：《电力系统自动化》2013年第15期83-88,共6页Automation of Electric Power Systems

基　　金：国家自然科学基金资助项目(51177128;51037005);教育部博士点基金资助项目(20110201110056)~~

摘　　要：提出了一种基于分布参数模型的柔性直流输电线路单端故障定位原理。由于柔性直流输电线路两端并联有大电容,直流线路发生单极接地故障后,1模故障分量网络中的电压行波具有以下2个特点:在两端直流母线处全反射,故障点处主要为折射;反射改变极性,折射不改变极性。据此可以在1模故障分量网络中计算本端第1次电压反射波及其前行路径上的电压分布,找出该电压分布的最强正跳变点,该点到对端的距离即为故障距离。该方法的故障定位精度高,理论上不受过渡电阻的影响,无需人工识别行波波头,易于实现故障定位的自动化,仿真结果表明该方法具有全线的适用性。A one-terminal fault location method for high voltage direct current（HVDC） Flexible transmission lines based on distributed parameter model is proposed.As high-capacity capacitors are connected to both ends of HVDC Flexible transmission lines,in the network of one-mode fault component,the voltage travelling waves have the following two features： total reflection of voltage traveling wave occurring at both DC buses of two-terminal HVDC transmission system and at the fault point the refraction of traveling wave stronger than the reflection;the polarity of voltage traveling wave changed due to reflection rather than refraction.Then,the voltage distribution of the first reflected wave at the measuring point and its forward path can be calculated.Finally,the strongest positive switching point in the voltage distribution can be found,and the distance from this point to the opposite terminal is the fault distance.This method has a satisfactory precision and is not affected by transition resistance theoretically.Besides,there is no need to artificially recognize the wave front of the traveling wave and the automation of fault location is easy to implement by use of the proposed algorithm.Simulation results show this method is applicable to the whole line.

关 键 词：柔性直流输电 故障定位 单端电气量 行波电压分布 

分 类 号：TM721.1[电气工程—电力系统及自动化]