The Fault Model and Diagnosis Scheme of Large-Capacity PWM Rectifier in Metro Supply

摘要

Metro system plays a key part in urban public transport, with large passenger flow and high performing velocity. The application of large-capacity PWM rectifier is now a hotspot in metro supply system. However, because PWM rectifier is a complex power electronical device, the probability of its fault is relatively higher than conventional diode rectifier. For quicker fault identification and diagnosis, the fault model and fault characteristics of large-capacity PWM rectifier should be reached. In this paper, the current and voltage fault characteristics are introduced thoroughly, together with a practical diagnosis scheme. In the last part, the diagnosis scheme is subjected to simulation and verified.