Reduced torque ripple of direct torque control of induction motor using hysteresis based controller

Azlan, Ashraf Nukman (2018) Reduced torque ripple of direct torque control of induction motor using hysteresis based controller. Project Report. Universiti Teknikal Malaysia Melaka, Melaka, Malaysia. (Submitted)

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Abstract

Alternating Current (AC) motor drives required the precision and faster response controller to achieve the excellent and optimal performance. Therefore, the vector control has been introduced to control the AC drive, either steady-state or dynamic response. One of the vector control method is Field Oriented Control (FOC) to control the AC motor. Although the FOC is the first controlling method was introduced, but this vector control method is complicated configuration and difficult to design. After a few decades, Direct Torque Control (DTC) was introduced. This vector control scheme is popular method, simplest structure and easy implementation for controlling the AC motor. DTC is widely used in industry as well as the electric vehicles because it is easy to design the configuration. Asynchronous motor is one of the AC motor. Asynchronous motor namely induction motor has some advantages due to economical, maintenance and weight. The conventional DTC controller has some major problems such as high torque ripple and switching devices do not operate at optimal performance during hardware implementation. The switching frequency controlled by the Voltage Source Inverter (VSI). DTC drive can operate at different of speed condition with applied the voltage vector which generated by using Voltage Source Inverter (VSI) by appropriate selection of voltage vectors. To improve the performance of induction motor, this thesis proposed a new topology circuit of VSI to ensure the switching devices operate at optimal performance. The torque is controlled by using hysteresis-based controller. The tolerant band of the hysteresis band are being control as the performances of the motor will improve. In summary, the torque is reduced by the hysteresis-based controller and the switching frequency is being adapted by new structure of switching devices.

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