基于线路参数估计的输电线路故障测距

Fault Location of Transmission Line Based on Line Parameter Estimation

针对传统测距方法不考虑线路参数变化情况造成故障定位不准确的问题,采用双端不同步的测距方法,并利用Huber抗差估计优化总体最小二乘法,解决了最小二乘法对线路参数估计过程中由于粗差存在造成的线路参数估计不准确的问题,从而提高了线路故障测距的准确度。通过Matlab仿真验证了该方法较传统测距方法线路参数估计准确度和故障测距精度更高,且测距结果不受故障位置和故障类型的影响。

The traditional fault location method has lower accuracy due to ignoring the change of line parameters. In order to improve accuracy of line fault location, two-terminal asynchronous location is used and total least square method is optimized by Huber robust estimation to reduce the effect of inaccurate line parameter estimation which is resulted from existed error when adopting total least square method. Matlab simulation shows that improved method is more accurate than traditional method in line parameter estimation and fault location accuracy. And the fault location results which are not affected by the fault location and fault type is also verified by simulation.