摘要
小波变换是在局部放电信号去噪过程中常用的方法,由于实际信号中噪声频带较宽,仅用小波变换去噪有可能带来波形畸变。文中将经验模态分解(Empircial Mode Decomposition,EMD)引入小波阈值去噪算法中,提出了一种基于EMD的小波阈值去噪算法,信号经EMD变换后被分解成若干个频率的本征模态函数(Intrinsic ModeFunc-tion,IMF),再对各个频率的IMF分量进行小波阈值去噪。相比于普通的小波阈值去噪算法,该方法能取得更好的去噪效果。对仿真信号和实测信号的处理结果验证了该方法的有效性。
Wavelet transform is the most commonly used method in processing partial discharge＇s noise.However,it might cause waveform distortion due to wind range of the actual signal noise.This paper proposes a wavelet threshold filtering method based on empirical mode decomposition：the original signal is transformed through the EMD and decomposed into several IMF.The results from simulation and measured data indicate that using this algorithm better interference suppression can be achieved.
出处
《电子科技》
2010年第11期64-66,73,共4页
Electronic Science and Technology
