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. پرونده مقاله

Three-phase induction motors as widely used electric drives in industry, automation, transportation and electric vehicles are mainly controlled by two conventional methods, vector control (VC) and direct torque control (DTC). The vector control method has a suitable steady state response, but in terms of dynamics and time to reach the steady state, it provides a relatively slower response. In contrast, the direct torque control method works almost the opposite way and provides a better dynamic response. Therefore, providing a control strategy that combines the advantages of the two mentioned methods as much as possible improves the driving performance of the induction motor. This paper presents a hybrid control method based on the optimal keying table to select the appropriate keying modes for the induction motor drive converter to improve the output dynamic response. To reduce current and torque ripples in different operational states, the space vector modulation technique has been used in the proposed drive system. The efficiency of the drive system presented with the hybrid control strategy has been compared with the conventional DTC and VC control methods, and the results illustrate a faster dynamic response of the proposed drive system with less steady-state ripples than the two conventional methods. Modeling and implementation of the proposed drive system have been performed in MATLAB/Simulink software. پرونده مقاله