摘要：With the development of power electronic technology, power electronic equipment is becoming
more and more complex, and the fault problems are becoming increasingly prominent. Fault
diagnosis of power electronic equipment can find out and solve the fault problems in time and
ensure the safe operation of the equipment. In this study, a fault diagnosis method based on
wavelet packet analysis and support vector machine was proposed. Firstly, the wavelet packet
transform was used to decompose and denoise the signal, and the original fault feature vector
was extracted for reconstruction. The improved support vector machine algorithm was used to
diagnose the fault based on the new fault feature vector. The three-phase rectifier circuit was
taken as an example to make stimulation experiments, and it was found that the method had
95% accuracy, which proved that the method had high accuracy and application value in fault
diagnosis of power electronic circuits.
