Open-Circuit Fault Diagnosis Method of ANPC Three-Level Inverter Based on Joint Optimized Echo State Network

A method based on Joint Optimized Echo State Network for inverter diagnosis is proposed. Firstly, the characteristics of the leg voltages under different fault conditions are extracted by wavelet packet analysis, and then low dimensional and discriminating feature vectors are extracted by Linear Discriminant Analysis. Next, Echo State Network optimized by an improved PSO is adopted to classify feature vectors of the wavelet packet energy spectrum. Simulation results prove the proposed method in this paper has more accuracy and faster detection speed than other models in the comparison experiment.