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Design of traction system is important to decide the dynamic configuration of high speed EMU. And one of the most important factors that determine the design of traction system is the thermal distribution of IGBT convertors. Thermal simulation of IGBT converter using a two-step methodology (temperature rise and thermal distribution) and its simulation results are presented in this paper . The simulation is based on the combination of an electrical model and a thermal one based on heat accumulation as well as the technique of computer programming. When designers change parameters of these models, the simulating software gets new temperature values and distribution state. So that the simulation can help designers configure the traction system. The modeling results have been checked by operation measured data

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