This paper studies the intelligent diagnosis technology of PWM rectifiers used in subway traction power supply systems. First, a damage prediction method for electrolytic capacitors based on parameter fitting and Miner\'s cumulative damage principle is proposed for the DC support capacitors that have the greatest impact on the reliability of PWM rectifiers. Secondly, based on the characteristics that the short-circuit current is suppressed by its AC reactor when the non-metallic short circuit occurs near the DC of the PWM rectifier, and thus protection cannot be achieved reliably, the non-metallic short-circuit current identification method of the PWM rectifier is studied. Finally, combined with the support of PWM rectifiers for high-performance fault diagnosis and virtual instrument technology, a comprehensive monitoring system for PWM rectifiers in subway traction substations is designed based on hierarchical distribution ideas and virtual instrument technology, the composition principle of the system is introduced, and the results of on-site fault recording are given.
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