基于FDTD-EMTR和地闪记录的闪络故障测距优化方法

针对配电线路中闪络故障存在实测数据故障行波难以标定，雷击位置与实际巡线结果误差较大的情况，提出基于FDTD-EMTR和地闪记录数据相结合的闪络故障测距结果优化方法。通过电磁时间反转法将故障暂态量重新注入回系统，并根据FDTD算法计算得到所有假设故障点的故障电流矩阵，以求解最大能量点对应的位置为参考故障点；计算线路走廊趋势与地闪记录的偏离程度，设置最大接近度参数为修正系数，对电磁时间反转测距结果优化修正。通过真实数据验证了该方法的可行性。

Optimization Method of Flashover Fault Location Based on FDTD-EMTR and Cloud-ground Flash Recording

In view of the fact that it is difficult to calibrate the fault traveling wave with the measured data of flashover fault in distribution lines， and there is a large error between the lightning stroke position and the actual line inspection results， the paper proposes an optimization method of flashover fault location based on the combination of FDTD-EMTR and cloud-ground flash recording data. The fault transient component is injected back into the system with the electromagnetic time reversal method， and the fault current matrix of all assumed fault points is calculated according to the FDTD algorithm， taking the position corresponding to the maximum energy point as the reference fault point. In addition， the deviation degree between the line corridor trend and the cloud-ground flash recording is calculated， and a maximum proximity parameter is used as a correction coefficient to optimize and correct the ranging results of the electromagnetic time reversal. The feasibility of the method is verified by real data.