A novel approach for a multirate 3 level carrier SVM of DTC based IM drive

This project describes the implementation of multirate sampling technique for 3-level carrier space vector pulse width modulation based direct torque control (CSVPWM DTC) of induction motor (IM) drive with an objective to reduce the electromagnetic torque ripple for medium to high power applications. The proposed multirate technique for 3-level CSVPWM DTC based IM drive gives lower torque ripple as compared to single rate sampling technique. In multirate sampling technique, for the same digital signal processor, two sampling periods are used. The fundamental sampling period is used for data capturing and estimation of speed, torque and flux parameters. The other sampling period which is an integer multiple of the fundamental sampling period, is used for speed, flux and torque error processing and also for the implementation of CSVPWM algorithm for synthesizing gate pulses. The 3-level inverter gives the smaller voltage steps lead to the production of higher power quality waveforms. The simulation results are experimentally validated.