基于谱减-小波算法电缆振荡波局部放电信号去噪方法的研究与实现

Study and Realization of the Method of Partial Discharge Signal Denoising Based on Spectral Subtraction Wavelet Algorithm

摘要: 提出谱减-小波方法对信号去噪，采用最小约束递归平均法估计噪声，利用谱减法降噪，提高信噪比；再用小波变换滤除谱减法引入的“音乐噪声”。对各种噪声强度下不同类型的放电信号进行评估，仿真和实验结果表明，该方法能很好地抑制干扰，同时保留局部放电信号特征。

Abstract: A spectral subtraction-wavelet method is proposed for signal denoising. The minimum constrained recursive averaging method is used to estimate the noise. The spectral subtraction method is used to reduce the noise and im-prove the signal-to-noise ratio. Then the "music noise" introduced by the spectral subtraction method is filtered by the wavelet transform. The simulation and experiment results show that the method can suppress the interference well and retain the characteristics of partial discharge signals at the same time.