Direct Torque Control (DTC) and three phase induction motor simulation in MATLAB/Simulink

Abstract

Direct Torque Control (DTC) is considered one of the most effective methods for the decoupled control of electromagnetic torque and speed in an induction motor. In DTC, torque is directly regulated by the torque angle, defined as the difference between the stator flux angle and the rotor flux angle. The advantages of employing DTC include the simplicity of implementation, a reduced number of controllers, excellent torque dynamics, and decreased torque oscillation. Implementing DTC with microcontrollers is easier than with Field-Oriented Control (FOC). This paper discusses the operational principles of DTC and highlights its advantages over the FOC method. The goal is to independently control stator flux linkages, rotor flux linkages, electromagnetic torque, and speed by providing the appropriate switching pulses to the Voltage Source Inverter (VSI). To validate the effectiveness of this control method, we modeled DTC and a 6-kW induction motor using MATLAB/Simulink. The results confirm the efficacy of DTC for decoupled control of torque and speed in the induction motor, demonstrating lower switching losses and excellent torque dynamics. The induction motor was tested under both no-load and a 10 Nm load conditions.