解析信号小波分析及其在电力系统中的应用

WAVELET TRANSFORM OF THE ANALYTIC FORM OF SIGNAL AND ITSAPPLICATION IN POWER SYSTEM

利用解析信号小波变换方法 ,将小波变换的时频局部性与信号的解析形式相结合 ,提取暂态信号的奇异点及各尺度分量的幅值包络、相位、瞬时频率等特征信息。通过理论推导和仿真分析 ,指出解析信号小波分析可以提取暂态信号更为丰富的特征信息 。

This paper introduces a wavelet transform method,which first expresses a real signal with its analytic form by adding an imaginary part of Hibert transformed form of the real signal and then transforms using Harming wavelet. It can obtain more signal details such as singularity,amplitude envelope,phase,and instantaneous frequency of transient signal by combining signal analytic description with the time- frequency feature of wavelet transform . Both theoretical analysis and simulation results prove that these characteristic details could provide new means for fault diagnosis and relay protection in power system.