MATLAB Simulation of Direct Torque Control for Three-Phase AC Induction Motors

This article presents a comprehensive guide to simulating Direct Torque Control (DTC) for three-phase AC induction motors using MATLAB. We begin by explaining the fundamental operating principles of induction motors and their critical importance in industrial applications. The concept of Direct Torque Control will be introduced, focusing on its implementation advantages including fast torque response and reduced parameter dependence. The MATLAB simulation methodology will be detailed with explanations of key components: stator flux estimation algorithms using voltage models, torque calculation methods, hysteresis band comparators for flux and torque control, and switching table implementation for inverter control. The simulation approach includes modeling the motor using Simulink blocks, implementing the DTC algorithm with MATLAB Function blocks or S-functions, and configuring appropriate sampling times for digital control implementation. Finally, we will summarize the key concepts covered and discuss their practical applications in industrial drive systems, including performance validation through torque and flux waveform analysis.