一种输电线路故障测距的精细积分新算法

Fault Location Algorithm Based on Improved Precise Integration

针对以往精细积分算法在计算暂态信号时误差较大、迭代结果容易发散的问题,通过使用一种新的差分格式对算法进行了改进,提高了算法的稳定性,增强了其对暂态信号的分析能力,并通过构造测距函数实现了基于暂态信号的输电线路故障定位.为使测距算法适用于双端数据异步的情况,利用故障前信号,提出了一种确定双端录波数据不同步时差和修正线路长度的算法,将其应用于三相输电线路的故障测距之中.算例仿真结果显示,采用该算法,故障定位精度绝对误差不超过0.6 km,最大相对误差为0.25%,且测距结果不受故障过渡电阻的影响,证明了算法的有效性.

Aiming the traditional precise integration method with big error in calculating transient signal and dissipated iteration,a new difference scheme improving the stability of algorithm and enhancing the analysis ability to the transient signal is proposed to achieve transmission line fault location based on transient signals by constructing a distance function.To apply the scheme to the double-side asynchronous data,an algorithm is adopted to calculate the two-terminal asynchronous time difference and length of transmission line based on the pre-fault recorded signal,and to calculate the fault location for three-phase transmission line.The simulation results show that the higher measurement accuracy without affecting by the fault transition resistance is achieved,the absolute error for fault location gets lower than 0.6 km,and the relative error is only 0.25%.