基于改进双端行波定位法的线路雷击点定位  

Lightning Strike Location Based on Improved Double Terminal Traveling Wave Location Method

作　　者：郭涌涛[1] 代颖[1] 邓武军[1] 

机构地区：[1]宜宾电业局,四川宜宾644002

出　　处：《四川电力技术》2008年第3期19-23,共5页Sichuan Electric Power Technology

摘　　要：现有雷电定位系统探测到的电磁波存在的波形传播延时和地形传播延时,将使定位精度受到影响。考虑到输电线遭受雷击时将产生向两端变电站母线运动的行波,结合现有的行波测距理论,提出一种改进的双端行波定位法对雷击点进行定位。通过在线路两端母线处采集雷击入射行波、母线反射行波或者雷击点的反射行波信号,利用小波变换提取行波波头特征点,精确确定行波到达时刻,进而确定一个只包含距离和时间的函数求解出雷击点的位置,实现不受波速影响的雷击点定位。该方法不需要事先确定行波波速,和传统行波定位法相比,消除了波速的不确定性带来的定位误差。大量PSCAD/EMTDC仿真结果表明,该方法能够有效地对雷击点进行定位,定位精度高。The accuracy of lightning strike location system is affected by the delay of the detected electromagnetic wave due to the waveform and the terrain. Considering that lightning strike will generate traveling wave toward both sides of the transmission line, an improved double terminal traveling wave location method is presented for the location of lightning strike. Using wavelet transform to extract the characteristics of the wave front at both sides of transmission line, the arrival time of the traveling wave from the point of strike, echo from the point of strike or echo from the opposite busbar can be measured. Then a function involving time and distance can be made and the point of strike is obtained. Compared with the traditional traveling wave method, this new method doesn＇t need to determine the traveling wave velocity, so the measurement error caused by the uncertainty of the wave velocity can be avoid. A large amount of PSCAD/EMTDC simulation results show that this new method is efficient and accurate in locating the lightning strike.

关 键 词：输电线路 雷击点定位 双端法行波 波速 

分 类 号：TM773[电气工程—电力系统及自动化]