Fault diagnosis of power electronic circuits based on wavelet packet decomposition and LibSVM

A new fault diagnosis method is proposed in this paper for power electronic circuit. An experimental platform of the three-phase full bridge controlled rectifier is built to test the proposed method. The output DC voltage is selected as the original signal to avoid the misdiagnosis because of load change. The features of the original signal are extracted by using the theory of wavelet packet decomposition. The standard deviation of each frequency component of the 3 layer constitutes the feature vector and then the different types of faults are identified by using LibSVM. Satisfied simulation and experiment results are obtained.