基于新型等效模型的逆变器故障诊断方法OA

An method of inverter fault diagnosis based on a novel equivalent model is proposed in this paper.Firstly,a new switch equivalent model is presented by analyzing the deficiencies in previous switch modeling,upon which a novel bond graph model of the inverter is established for fault diagnosis.To address the issue of false alarms caused by the uncertainty of discrete state variables,a feedback correction mechanism is introduced,which automatically corrects residual values based on discrete state changes,with its parameter settings optimized through an optimization problem.Furthermore,a fault diagnosis method based on a non-fused fault signature matrix is established,and the diagnosis of IGBT parameter faults is enhanced.The simulations demonstrate that the proposed correction mechanism effectively resolves false alarms due to discrete state variable uncertainty,and both the novel equivalent model and the new diagnosis method improve the performance of fault isolation.