说明：  是学习PCA特征提取的很好的学习资料，分析了该信号的时域、频域、倒谱，循环谱等,三相光伏逆变并网的仿真。
( Is a good learning materials to learn PCA feature extraction, Analysis of the signal time domain, frequency domain, cepstrum, cyclic spectrum, etc. Three-phase photovoltaic inverter and network simulation.)