基于模极大值小波域的局部放电信号重构算法

ALGORITHM OF PARTIAL DISCHARGE SIGNAL RECONSTRUCTION BASED ON MODULUS MAXIMUM WAVELET DOMAIN

局部放电信号是奇异信号,利用模极大值原理,可 以对局部放电信号去噪。然而,对于单个的局部放电脉冲 信号,如何由保留下来的少数模极大值点重构局部放电信 号是一个重要课题。为此,该文提出一种基于模极大值小 波域的局部放电信号重构算法。该算祛先根据模极大值小 波域的定义求出局部放电信号的模极大值小波域,从而得 到局部放电信号的小波系数,然后逆变换得到局部放电信 号。实例分析表明,该算法程序简单,易实现,速度快, 能满足局部放电在线监测的需要。

Partial Discharge(PD) is singulearity signal. Noise is removed from PD signal by modulus maximum theory.However, how to reconstruct PD signal from few modulus maximum dots is an important problem. Therefore, an algorithm of PD signal reconstruction based on modulus maximum wavelet domain is presented in this paper. The modulus maximum wavelet domain is sought out based on its definition, which is wavelet transform of PD signal. Then PD signal is reconstructed by inverse wavelet transform. The examples show that it is simple, straightforward and fast, which can satisfy the need of PD monitoring on-line.