Predictive torque control strategy of an Open-End Winding Induction Motor Drive with less common-mode voltage

Abstract

Direct Torque Control (DTC) and Predictive Torque Control (PTC) Strategies emerged as popular techniques for speed control of Induction Motor Drives. In this article, an effective PTC strategy is introduced to an Open-End Winding Induction Motor Drive (OEWIMD) to control torque and flux directly. PTC offers all the features of classical DTC and it provides lesser ripple in torque and flux. The limitations of classical PTC are: (i) higher common-mode voltage (ii) variable switching frequency (iii) high computational burden and (iii) selection of weighting factors. To trounce some of these problems PTC of OEWIMD is developed. OEWIMD is operated with dual inverter configuration. In dual inverter configuration, if the inverters are operated with equal DC bus voltages (1:1 ratio), it can deliver ‘18’ space vector locations, out of these space vector locations only six active space vectors and a null vector has been considered. The voltage vectors used to implement the proposed algorithm can maintain less common-mode voltage. The proposed algorithm is verified by comparing the obtained experimental results with simulation results.