基于零模行波波速量化的高压输电线路双端故障定位方法  

Two-terminal fault location method for high-voltage transmission line based on zero-mode traveling wave velocity quantization

作　　者：王炜 王全金 尹力 孙海霞 王华 侯添钰 梁睿 WANG Wei;WANG Quanjin;YIN Li;SUN Haixia;WANG Hua;HOU Tianyu;LIANG Rui(Lianyungang Power Supply Company of State Grid Jiangsu Electric Power Co.,Ltd.,Lianyungang 222004,China;School of Electrical and Power Engineering,China University of Mining and Technology,Xuzhou 221116,China)

机构地区：[1]国网江苏电力有限公司连云港供电分公司,江苏连云港222004 [2]中国矿业大学电气与动力工程学院,江苏徐州221116

出　　处：《电力自动化设备》2022年第12期165-170,共6页Electric Power Automation Equipment

基　　金：国家电网有限公司科技项目(J2021032);江苏省自然科学基金面上项目(BK20201348)。

摘　　要：结合行波零模分量传播的依频特性和衰减特性,提出基于零模行波波速量化的高压输电线路双端故障定位方法。利用最小二乘法拟合零模行波波速与故障零模行波到达首末端的传输时间差之间的关系。基于故障发生后实际测量行波信号的传输时间差,获取对应首末端的零模行波实际波速代入改进的双端行波测距方程实现故障定位。在PSCAD/EMTDC中搭建500 kV高压输电线路依频特性模型对所提方法进行仿真验证,结果表明该方法基本不受故障位置和故障电阻的影响,具有较高的故障定位精度。Combining with the frequency-dependent characteristics and attenuation characteristics of the zeromode component of the traveling wave,a two-terminal fault location method for high-voltage transmission line based on zero-mode traveling wave velocity quantization is proposed.The least squares method is used to fit the relationship between the zero-mode traveling wave velocity and the difference between the propagation time of faulty zero-mode traveling wave to reach the sending and receiving terminals.Based on the actual measurement of the transmission time difference of the traveling wave signal after the fault occurs,the actual wave velocity of the zero-mode traveling wave corresponding to the sending and receiving terminals is obtained,and it is substituted into the improved two-terminal traveling wave ranging equation to realize the fault location.A 500 kV high-voltage transmission line frequency-dependent characteristic model is built in PSCAD/EMTDC to verify the proposed method.The simulative results show that the proposed method is basically not affected by the fault location and fault resistance,and has high accuracy and reliability of fault location.

关 键 词：高压输电线路 波速量化 双端故障定位 传输时间差 零模行波 

分 类 号：TM75[电气工程—电力系统及自动化]