Simplified SVPWM based hybrid PWM for induction motor drives for the reduction of torque ripples

Abstract

A voltage source inverter-fed induction motor produces a pulsating torque due the application of no sinusoidal voltages. Torque pulsation is strongly influenced by switching fashion employed. This paper presents the simplified hybrid pulse width modulating technique for the reduction of torque ripples in an induction mo tor. In conventional space vector pulse width modulating (CSVPWM) technique (0127-7210) the zero states are divided equally and give rise to continuous modulating technique. The hybrid PWM is a combination of both continuous and discontinuous PWM techniques. To modulate the required voltage vector calculation of magnitude and angle are required which is complex. In this paper a simplified algorithm based on the concept of imaginary switching times is implemented. To validate this method simulation has been carried out in MATLAB 7.8 on v/f control of induction motor.