Fault Diagnosis of Three phase Rectifier Circuit Based on VMD-SSA Algorithm

With the rapid development of power electronic circuits, power electronic devices are becoming more and more complex, with many fault types and low diagnostic accuracy. This paper proposes a solution based on variational mode decomposition and sparrow search algorithm to optimize support vector machines. Firstly, Simulink is used to establish the simulation model of three-phase bridge type fully controlled rectifier circuit, and the output voltage signal is decomposed by using variational mode decomposition to calculate and extract fault eigenvalue, and the fault data is normalized; Then the sparrow search algorithm is used to optimize the support vector machine, and the penalty factors and kernel parameters of the optimal estimation are searched out, and the obtained data are trained and diagnosed; Finally, the method is compared with the support vector machine without optimization. The final simulation results show that the method is superior to the unoptimized support vector machine in training accuracy and diagnosis effect.