Presented in this paper are the structure of SIBAS32 control system, TCN train communication network and its CCU control soft of type HXD1 high-power AC electric locomotive.

This paper introduces a microprocessor controlled PWM real time controller used in AC-DC-AC electric locomotive. A real-time forming method of multi-mode PWM waveform is described.

Analysis and discussions are made on certain technical problems occurring during the test of AC4000, the first ac drive main line electric locomotive as well as the causes thereof.