In order to effectively monitor the insulation condition of metal oxide arresters,a leakage current denoising method based on improved empirical mode decomposition is proposed.Firstly,the end point is extended to suppress the end effect by considering both waveform and amplitude similarity comprehensively,and then the leakage current signal without noise is reconstructed according to the comprehensive index that incorporates the smoothness and correlation of the intrinsic mode function.Subsequently,the weight parameters were dynamically adjusted and updated through the coordinate descent method to ensure the rationality and accuracy of the reconstructed signals.Finally,through analysis of simulated and measured data,it is confirmed that the proposed method can effectively eliminate the noise interference in the leakage current signal,and identify abnormal monitoring values,meeting the practical requirements of engineering.
关键词
金属氧化物避雷器/泄漏电流/经验模态分解/端点效应/波形匹配/坐标下降法
Key words
metal oxide arrester/leakage current/empirical mode decomposition/end effect/waveform matching/coordinate descent method
维普
万方数据