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线调频小波变换统一了短时 Fourier变换和小波变换的时频分析 ,并能根据信号的特点自适应生成新的时频窗口。本文首次将线调频小波变换引进电力系统的突变信号处理中。分析了其消噪和滤除干扰的原理 ;构造了线调频小波变换的算法。该算法不仅能解决文 [9]中提出的消噪和滤除干扰的问题 ,还能解决文 [8,1 0 ]中提出关于滤除整数 (偶数 )次和分数次谐波 ,并通过对电力系统突变信号处理的实例说明该算法的突出优点
Linear FM wavelet transform unified the short-time Fourier transform and wavelet transform time-frequency analysis, and can automatically generate a new time-frequency window according to the characteristics of the signal. In this paper, for the first time, the linear FM wavelet transform is introduced into the abrupt signal processing of power system. The principle of noise elimination and filter interference is analyzed. An algorithm of linear FM wavelet transform is constructed. The proposed algorithm not only solves the problem of denoising and filtering interference proposed in [9], but also solves the problem of filtering out integer (even) and fractional harmonics proposed in [8, 10] An example of power system abrupt signal processing illustrates the outstanding advantages of this algorithm