Direct Torque Control for Induction Machine Drive based on Sliding Mode Controller with a New Adaptive Speed Observer

Abstract

this paper presents a Direct Torque Control approach (DTC) based on a sliding mode controller applied to an induction machine with a new adaptive speed observer fed by a voltage source inverter. The DTC is one of the most superior strategies control for induction machine drive (IM). They aim to give a decoupled control of electromagnetique torque and stator flux. However, the main problem associated with the conventional DTC was the high torque and flux ripples. This disadvantage was amended with the use of a control scheme which combined Direct Torque Control with a sliding mode strategy. The sliding mode controller is structured dependent on the stator flux and electromagnetic torque errors, to make the electromagnetique torque and stator flux quick and precise alteration. A new adaptive observer design using the Super Twisting strategy for rotor speed estimation is made. The main aim is to accomplish a efficient and robust control, which will enable us to test and evaluate the performance of the proposed control of the IM drive, with the new adaptive speed observer. The tests are effectuate and validated by numerical simulation using MATLAB/SIMULINK toolbox. The simulation results will show the effectiveness of the proposed sensorless control scheme.