Research on Fault Diagnosis Technology of Charging Device Based on Electric Thermal Coupling Simulation Model
The station DC power supply charging device is used to supply power for the DC load and charge the battery,and the power device is prone to open circuit or short circuit fault after long-term operation.To solve the problem of difficult fault iden-tification of power devices,the open circuit fault characteristics of Boost circuit power tube were analyzed by combining the two-stage topology of boost boost circuit and LLC resonant transformation,and the electrothermal coupling physical simulation model of LLC power tube fault was established.The variation pattern of current,voltage and junction temperature curve before and after power tube failure is analyzed by Simulink/Plecs joint simulation.The fault diagnosis strategy of charging module power tube based on abnormal electrothermal stress was designed.Test verification shows that the fault diagnostic strategy can realize the accurate identification of power device fault and the timely warning of abnormalities.
万方数据
维普
