PSpice modeling of electrified railway propulsion drive rectifiers for harmonic analysis

A method to construct the electrified railway propulsion drive rectifier in PSpice for EMC assessment is developed. The working mechanisms of a three level NPC PWM rectifier and its logical signal generator are elaborated. Besides that, the convergence problem of PSpice is explained and the proper parametric settings for simulation in this paper are given. At last, the noise spectra for two different loads are compared and the causes for this difference are discussed as well.