基于小波包分解的时变谐波分析

A Method of the Time-varying Harmonic Analysis Based on Wavelet Packet Transform

针对时变谐波的分析,提出了一种基于小波包分解的时-频分析的新方法,该方法利用共轭正交滤波器组所具有的功率互补性,对信号进行小波包变换频域等间隔分解,再将各子带输出交错组合,使得所测各次谐波均落入各自相应的频带内,从而达到对各次时变谐波测量与时频分析的目的。

A new time-frequency analysis method based on wavelet packet transform in allusion to time|varying harmonic measurement is presented. According to the power complementary of conjugate quadrature filter bank, the time-varying harmonic signal is decomposed with same resolution in frequency-domain by wavelet packet transform. Then the outputs of all subbands are cross-combined and that make different levels of harmonics fall on their corresponding frequency bands. So, the time-varying harmonics could be detected and the time-frequency analysis would be realized.