基于离散小波变换的交流输电线路永久性单相接地故障辨识研究

Research on permanent single line-to-ground fault identification of AC transmission lines based on discrete wavelet transform

为实现对交流输电线路永久性单相接地故障的准确辨识,引入离散小波变换,开展交流输电线路单永故障辨识研究。利用离散小波变换,对交流输电线路信号进行降噪处理。对单相永久性故障进行判别和计算,设定阈值,完成交流输电线路单相永久性故障辨识。通过对比试验证明,新的辨识方法可得到更加接近实际情况的辨识结果,具备较高的辨识准确性,值得广泛应用和推广。

In order to achieve accurate identification of permanent single line-to-ground faults in AC transmission lines,discrete wavelet transform is introduced to conduct research on permanent single line-to-ground fault identification in AC transmission lines.Using discrete wavelet transform to denoise the AC transmission line signals,allowing for discrimination and calculation of single-phase permanent faults.Setting a threshold to complete the identification of permanent single-phase faults in AC transmission lines.Comparative experiments have shown that the new identification method can obtain identification results that are closer to the actual situation,with extremely high identification accuracy,and is worthy of wide application and promotion.