Comparative study between a three and a five-level inverter for DTC control of the doubly fed induction motor

Conventional Direct Torque Control (DTC) is an advanced means of regulating doubly fed induction motors (DFIM) offering superior performance due to its simplicity, high reliability, sensitivity to motor parameters, and improved dynamic response. Nevertheless, the uncontrolled switching frequency of the DTC resulting a high ripple in the torque and the flux which leads to acoustic noise that negatively impacts the control system's performance. Several DTC control strategies have been developed to overcome the limitations of traditional direct torque control (DTC) by concentrating on torque and flux. In this article, the development of DTC is discussed. The main objective of the paper is to improve the performance of conventional DFIM DTC control, thereby reducing energy losses and improving system efficiency, by using multi-level DTC. In this paper, we compare the performance of two structures of DFIM's three-level direct torque control and five-level DTC control and present the simulation results. The flux and torque rays are evaluated and compared. The goal is to determine the control that gives the best results.