Speed Control Applying Hysteresis Current Combining Sine Pulse Width Modulation for Induction Motor Drive

Abstract

An enhanced technique combining hysteresis current (HC) and sine pulse width modulation (SPWM) for generating the switching pulse to the inverter is proposed for speed control based on a rotor field-oriented control (RFOC) strategy in the induction motor drive. HC method is a simple and robust control method, it has a fast response in speed control, but the rotor speed and the stator current have high ripple. SPWM method, a popular method in triangular carrier wave modulation methods, has high precision in controlling the speed and torque of the motor; however, the high overshoot of the speed response in the transient phase is the weakness of this method. In this paper, a combined method of the above two methods, called hysteresis current-sine pulse width modulation (HCSPWM), is proposed for motor speed control. The simulations are implemented at various speed ranges in MatLab/Simulink environment. The simulation results have proved that the proposed method has a lower overshoot than the SPWM method in the transient-state and a lower ripple than the HC method in the steady-state in the same operating condition.

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