说明：  基于小波变换和 HHT 的分布式并网系统谐波检测方法。 该方法利用小波变换多分辨率分析思想对信号进行划分，并对划分后的信号进行经验模态分解，得到一系列的经验模态函数IMF，并从 IMF分量中提取出基波分量和高次谐波；再对IMF分量进行Hilbert 变换得到信号的频率、幅值信息。
(Wavelet transform and HHT based distributed systems and network harmonic detection method. The method uses multi-resolution analysis of wavelet transform ideological divide the signal, and the signal is divided after the empirical mode decomposition to obtain a series of empirical mode function IMF, and extract the fundamental component and a component of the high-order IMF harmonics and then the IMF component of Hilbert transform frequency, amplitude information of the signal.)