A New Method for Interharmonic Identification

A new method based on improved multiple signal classification (MUSIC) algorithm and independent component analysis (ICA) method is applied in this paper. In contrast with the original MUSIC algorithm, the proposed version can give good performance at lower signal/noise ratio (SNR). After estimating the frequencies accurately, the amplitudes and phases of interharmonics are calculated with ICA method. Compared with some other algorithms, the improved MUSIC algorithm obtained higher resolution in frequency domain and ICA method separated fixed signal into several independent signals. The simulation indicates the validity of this method.