Keywords: traction inverter system, fault diagnosis technology, IGCT three-level inverter, structural failure, parametric failure, experiment.

This paper investigates the fault diagnosis technology of the high-speed maglev traction inverter system using IGCT three-level inverters. Due to the increase in output levels, the number of power devices increases. The circuit structure and control structure become more complex. Secondly, power devices withstand high voltage and current during operation, generate a large amount of heat, and accelerate the aging rate. This leads to degradation in component performance and reduced reliability, increasing the probability of failures. Therefore, improving the online monitoring and fault diagnosis technology of traction inverter systems is crucial for the safe, efficient, and reliable operation of high-speed maglev traction. This paper first establishes an accurate mathematical model and conducts simulation analysis of system operation characteristics under different fault conditions. It then proposes and designs power device fault feature extraction and localization methods suitable for different operating conditions. Finally, the design, development, and evaluation of fault diagnosis equipment for high-speed maglev train high-voltage, high-capacity three-level traction inverter systems are completed, including analysis processing software, fault recognition software, and human-machine interface design.

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