Dynamic Modeling and Vector Control of AC Induction Traction Motor in China Railway

In this research paper, control of induction motor drive with high-performance characteristics is developed by using vector control, direct-torque control also with the predictive control model. The coordinate transformation has been introduced and established with the mathematical-models of the induction motor (CRH3 high-speed Electric Multiple Units in China Railway) in the two-phase rotating reference frame and the two-phase stationary reference frame. Along-with the discussion of vector control basic principle, the dynamic mathematicalmodel of the induction motor in the two-phase reference frame is presented. Also, the method of the rotor’s field orientation in the two-phase reference frame is presented. Based on some metro-traction motor parameters of 2.7kV and 1KHz voltages and operating Frequency respectively, MATLAB/Simulink simulation result verifies the principle, control performance, and characteristics of different control strategies, which are comparatively analyzed in detail.