Three Speed Controllers of Direct Torque Control for a Doubly Fed Induction Motor Drive-A Comparison

This research paper presents the performance of direct torque control (DTC) for a doubly fed induction motor (DFIM). The DFIM performance depends mainly on the design of the speed controller. The traditional proportional-integral (PI) speed controller is not very effective when the system is highly perturbed, and its gain values depend on engine parameters that are not constant. Consequently, a robust speed controller is required to achieve a high-performance drive. A backstepping speed controller is developed to achieve continuous control of the motor speed and torque. In addition, the fuzzy logic speed controller is designed to achieve high performance, speed accuracy, dynamic tracking behavior, and robustness to load disturbances. The control algorithms offered are simulated and tested in a MATLAB/Simulink environment. A comparative analysis of these speed controllers of the DTC strategy is conducted and discussed, highlighting the method that best meets the requirements in terms of dynamic response, references tracking, torque ripple, complexity, and robustness to torque variation.