Investigation of PI-Controller with a Sinusoidal Function and Feedforward Control on Traction Motor of High-Speed

Direct torque control of three-phase induction motor based on constant voltage per frequency control preserves the conventional direct torque control transient merits, furthermore, produces better quality steady-state performance in a wide speed range. In this paper, the simple PI Plus Sinusoidal Function controller is introduced to substitute the original PI controller for speed controller, torque and stator flux magnitude controller using ON-Off controller. The simulation results have confirmed the validity of the proposed controller as well as shown good dynamic and steady-state responses of this control system. In the traction drive system for high-speed train, a substantial ripple of DC bus voltage may negatively affect the performance of the traction drives. A new method to reject the torque and current ripple (beat components) in induction motor, which resulted from the DC bus pulsation, is presented in this paper. Based on the internal model principle, proportional-integral-resonant (PIR) controllers are used in the d-q currents loops instead of the PI controllers. Without bulky LC filters and the effects of sampling accuracy to the ripple eliminating common methods, the introduced method is economic and easy to implementation. In this paper, a PI Plus Sinusoidal Function controller is derived and simulated using the parameters of traction motor of high speed Train. Feedforward control was also considered.