基于小波包变换的架空输电线路雷击故障高精度定位方法

High-precision lightning Fault Location Method for Overhead Transmission Lines Based on Wavelet Packet Transform

当前的输电线路雷击故障定位节点一般为目标性设定,定位区域不灵活,导致高精度定位误差增加,为此提出对基于小波包变换的架空输电线路雷击故障高精度定位方法的设计与验证分析。根据实际的定位需求及标准,先对暂态波形故障特征作出识别,采用分布式的节点设定结构,灵活设置定位区域,完成节点的部署。以此为基础,构建小波包变换雷击故障定位模型,采用小波正交标定实现雷击故障定位处理。最终的测试结果表明:与传统机器学习和雷电感应输电线雷击故障高精度定位测试组,及传统平滑阈值函数分布输电线雷击故障高精度定位测试组相比较,此次所设计的小波包变换输电线雷击故障高精度定位测试组最终得出的雷击故障高精度定位误差相对较小,被控制在0.4m以下,说明该种定位方式效果更佳,针对性强,定位误差可控制,具有实际的应用价值。

The current lightning fault location nodes of transmission lines are generally targeted,and the location area is not flexible,resulting in the increase of high-precision location error.Therefore,the design and verification analysis of high-precision lightning fault location method for overhead transmission lines based on wavelet packet transform is proposed.According to the actual location requirements and standards,the transient waveform fault characteristics are identified first,and the distributed node setting structure is adopted to flexibly set the location area to complete the node deployment.On this basis,a lightning fault location model based on wavelet packet transform is constructed,and the lightning fault location processing is realized by wavelet orthogonal calibration.The final test results show that compared with the traditional machine learning and high-precision lightning fault location test group for lightning induction transmission lines,and the high-precision lightning fault location test group for traditional smooth threshold function distribution transmission lines,the high-precision lightning fault location test group designed by this time is relatively small,and is controlled below 0.4m,It shows that this positioning method has better effect,strong pertinence,controllable positioning error and practical application value.