Analysis and Performance Comparison of Vector Control Method with Direct Torque Control to Reduce Current and Speed ripples of Three-Phase Induction Motors

Today, three-phase induction motors are widely used in industry due to advantages such as lower maintenance requirements, higher reliability, lower design costs, and the ability to operate in dusty and explosive environments. Vector control and direct torque control are two common methods for controlling induction motors. The control algorithm of the two methods is almost the same in some cases and completely different in others. Each of the control methods has advantages due to their general structure, which lead to a better response compared to other methods. The vector control method contains a good steady state response however offers relatively less speed dynamic responses and steady state time. Several methods have been proposed to solve this problem. In this paper, a switching table is used to select the appropriate switching modes for the induction motor drive to improve the output dynamic response. Comparison of the results obtained from the performance of the drive under test with the vector control and direct torque control methods illustrates that the response of the drive system to the vector control includes faster dynamics with less constant state fluctuations. In order to validate the performance of the drive system, MATLAB software has been utilized for modeling and simulation.