许佳,牛海清,郑文坚,吴炬卓.改进阈值函数的小波熵方法抑制局部放电白噪声的研究[J].电测与仪表,2017,54(8):. XU Jia,NIU Hai-qing,ZHENG Wen-jian,wujuzhuo.Suppressing White Noise in PD Signal Based on Wavelet Entropy and Improved Threshold Function[J].Electrical Measurement & Instrumentation,2017,54(8):.
改进阈值函数的小波熵方法抑制局部放电白噪声的研究
Suppressing White Noise in PD Signal Based on Wavelet Entropy and Improved Threshold Function
Aiming at the shortcomings of traditional hard threshold method and soft threshold method, this paper puts forward a wavelet de-noising method based on wavelet entropy and improved threshold function. First, the noisy partial discharge (PD) signals are processed by wavelet decomposition, then the wavelet coefficients are processed by a new improved threshold function using adaptive selection of threshold based on wavelet entropy, finally the denoised signal can be got by reconstruction. The de-noising results of typical simulative signals and the field signals reveal that this present method can effectively remove white noise.
