小波包变换和数学形态滤波器在局部放电信号去噪中的应用  

Application of wavelet packet transform and mathematicalmorphological filter in partial discharge signal denoising

作　　者：王珊珊 孟阳 何晓会 谢明 赵忠锋 WANG Shanshan;MENG Yang;HE Xiaohui;XIE Ming;ZHAO Zhongfeng(Harbin Power Station Technology Development Co.,Ltd.,Harbin 150046,China;Materials company of State Grid Heilongjiang Electric Power Co.,Ltd.,Harbin 150001,China;Elecric Power Research Institute of State Grid Heilongjiang Electric Power Co.,Ltd.,Harbin 150030,China)

机构地区：[1]哈尔滨电站科技开发有限公司,哈尔滨150046 [2]国网黑龙江省电力有限公司物资公司,哈尔滨150001 [3]国网黑龙江省电力有限公司电力科学研究院,哈尔滨150030

出　　处：《黑龙江电力》2022年第3期209-212,共4页Heilongjiang Electric Power

摘　　要：现场局部放电在线监测过程中会产生强噪声干扰,为了从强噪声干扰中提取局部放电信号,采用小波包变换和数学形态滤波器相融合的方法,将含有噪声的局部放电信号进行去噪处理。采用小波阈值法、EMD方法及所提方法分别对混合各种噪声后的局部放电信号进行去噪处理,仿真结果表明,所提方法去噪后的波形最接近原始波形,波形失真率最低,具有良好的去噪效果。In order to extract partial discharge signals from the strong noise interference generated in the process of on-line partial discharge monitoring,the method of combining wavelet packet transform and mathematical morphological filter is used to denoise the partial discharge signal containing noise.Wavelet threshold method,EMD method and the proposed method are used to denoise the partial discharge signal after mixing various noises.The simulation results show that the denoised waveform of the proposed method is the closest to the original waveform,the waveform distortion rate is the lowest,and has a good denoising effect.

关 键 词：变压器 局部放电 信号去噪 小波包变换 形态滤波器 

分 类 号：TM406[电气工程—电器]