Harmonic and Interharmonic Signal AnalysisBased on Generalized S-Transform

This paper presents a new approach to analyzeharmonics using the Generalized S-transform (GST)and clonal selection algorithm. After Comparing the effectof p and k in GST on the harmonics detection, a modifiedGST was adopted, in which the k parameter waschanged with the different frequency band, and the frequenciesof interharmonics detected mistakenly were correctedthrough the instantaneous frequencies. The harmonicsamplitudes and phases given by GST were withsome error, so the clonal selection algorithm was used tooptimize them, and the detail optimization process wasdescribed in this paper. The simulation results show thatthe method could analyze the harmonics and interharmonicsaccurately, and its performance is far better than FFTespecially in analyzing the interharmonics and transientharmonics.