基于改进参数检测法的双端非同步数据故障测距算法

Two-terminal asynchronous data fault location algorithm based on improved parameter detection method

基于输电线路分布参数模型,提出一种基于改进参数检测法的双端非同步数据故障测距算法。该算法利用故障前两端电压、电流数据实时修正非同步角度和线路参数,再利用故障后数据进行故障测距。与拟牛顿法相比,所提算法无需迭代,计算量小;与电压趋势法相比,所提算法不存在伪根判别的问题;与传统参数检测法相比,所提算法能够实时修正非同步角度。基于PSCAD/EMTDC的仿真结果表明,该算法测距精度高,受故障条件和线路换位的影响较小。

According to the distribution parameter model of power transmission line and the asynchronous data of its two terminals,a fault location algorithm based on the improved parameter detection method is proposed,which applies the voltage and current data of two terminals in normal condition to correct the asynchronous angle and line parameter in real time and uses the voltage and current data of two terminals in faulty condition to locate the fault. Compared to the quasi-Newton method,it avoids the iterative operation and has smaller calculation load;compared discrimination;compared to the traditional parameter to the voltage trend method,it avoids the pseudo root detection method,it corrects the asynchronous angle in real time. Simulative resuhs by PSCAD/EMTDC show that,with high algorithm is slightly influenced by the fault condition and line transposition.