Inverter open-circuit fault online diagnosis method

The invention discloses an inverter open-circuit fault on-line diagnosis method, which comprises the following steps of S1, acquiring three-phase output current signals ia, ib and ic of an inverter in real time, and performing Fourier transform analysis to obtain fault characteristic parameters represented when different open-circuit faults occur in the inverter; s2, preprocessing the fault feature parameters by using the feature parameters; s3, carrying out the antecedent network operation of the T-S fuzzy neural network, and obtaining the output of the antecedent network; and S4, carrying out the consequent network operation of the T-S fuzzy neural network, and obtaining a fault diagnosis result. According to the method, the problems of multi-causal coupling, fuzziness, uncertainty and the like between the open-circuit fault characteristics and the fault types of the inverter are solved, and the accuracy of online diagnosis of the open-circuit fault of the three-phase two-level inverter is improved; on-line