We usually say FFT mode (fast Fourier transform) and dq transform mode. Dq transformation can refer to the instantaneous power principle proposed by Japanese scholar Akagi in 1984. Interharmonics proposed upstairs is a research direction now. With the development of power electronic equipment, more and more interharmonics appear in more and more occasions. In principle, FFT cannot be extended to get a score. For detailed wavelet analysis, please refer to/view/83268.html. wtp=tt