Abstract：The double-PWM rectifier is an important part of the electric traction AC drive system. Its reliability directly affects the safe and stable operation of the entire EMUs. The IGBT is the most vulnerable part of the rectifier. In the existing literature, there are few researches on open fault location of multiple IGBTs. However, there are 8 power transistors in the double-PWM rectifier, hence the diagnosis of double-tube and multi-tube faults cannot be ignored. In this paper, taking the double-PWM rectifier as the research object, the normal working mode and various power tube open-circuit faults were analyzed. By comparing the changes of gate signal and line voltage, a fast diagnosis method for multi-tube open-circuit fault was proposed. It has the advantages of simple hardware circuit and small calculation. Test results in the hardware-in-the-loop (HIL) and rapid control prototyping (RCP) system have illustrated the validity and feasibility of the proposed method based on electromagnetic transient simulation software StarSim. It is show that the method can quickly locate the faults of single, double and multi-tube of power tubes without being affected by load disturbance.
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2020, Vol. 35 
