Performance Study of VDRPWM Algorithm based Direct Torque Controlled Open-End Winding Induction Motor

The conventional simplified SVPWM provides good performance and ease in control of Induction motor but it also results in high acoustic noise and harmonic distortion. Randomization of the switching pattern causes the spread spectrum results in the reduction of the acoustic noise. In this paper a Variable Delay Random PWM algorithm with constant switching frequency is employed for the reduction of the acoustic noise for a Direct Torque Controlled open-end winding Induction motor. To verify performance for the aforementioned drive, simulations have been carried out and the results are presented by comparing the simplified SVPWM with VDRPWM. From the simulation results it can be observed that VDRPWM algorithm reduces the THD and acoustic noise by spreading the harmonic spectra.