Abstract
Due to the good adaptability of wavelet theory in signal processing, its current application fields are very extensive. This paper first summarizes the application fields of current wavelet theory and analyzes the characteristics of wavelet analysis theory. Then, several methods for fault diagnosis of traditional inverter circuits are listed. The limitations of their fault diagnosis in new multi-level inverter circuits are analyzed. The wavelet analysis is applied to the fault diagnosis of multi-level inverter circuits. After analyzing the fault mode of the multi-level inverter circuit, the wavelet packet is used to extract the fault features, and then the support vector machine theory is combined to diagnose the fault. Finally, the method described in this paper is verified by Simulink simulation software, and the accuracy of the method is more than 90%. The method is feasible and effective.
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