改进阈值函数的小波熵方法抑制局部放电白噪声的研究

针对传统硬阈值法和软阈值法的缺陷,提出了改进阈值函数的小波熵方法。该方法对含噪局放信号进行小波分解,基于小波熵自适应选取阈值,并引入一种改进阈值函数对小波系数进行处理,最后重构得到去噪后信号。典型仿真信号和实测信号的去噪结果表明,提出的方法能够有效去除局放信号中的白噪声。

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.Firstly, the noisy partial discharge (PD) signals are processed by wavelet decomposition, and then, the wavelet coefficients are processed by a new improved threshold function using adaptive selection of threshold based on wavelet entropy, finally, the de-noised signal can be obtained by reconstruction.The de-noising results of typical simulation signals and the field signals reveal that this proposed method can effectively remove white noise in partial discharge.