Robust DTC for Three Phase Induction Motor Drive Systems using FSTPI

Abstract

An effective and efficient drive should be capable of driving the Induction Motor (IM) on all four operation quadrants and running to full capacity in a well-controlled manner. In this paper a Four Switch Three Phase Inverter (FSTPI) driving an IM using the Direct Torque Control (DTC) strategy is proposed. The theory and design of the drive system is outlined and then simulated with an IM model in the synchronous reference frame using Matlab/Simulink package. The drive is subjected to different system inputs and disturbances such as step changes in speed under different load conditions, abrupt loading at high speed and speed reversal. Also, the motor parameters that vary with motor operating conditions such as the stator resistance and moment of inertia are varied from the rated value to examine the motor speed dynamics. The results assure that the drive is valid with fast torque response, high stability and good dynamic performance.