Contribution to the enhancement of dual dtc application: Doubly fed induction motor

In this paper, we present a double direct control of the torque of the doubly fed induction motor (DFIM). First, the modeling of the motor is carried out in order to apply the technique of dual direct control of the torque (DTC). Thereafter, an explanation of the said control is spread out as well as the principle of adjusting the flux and the electromagnetic torque according to the desired speed. Then, the estimation's method of these two control variables will be presented in addition to the adopted switching table of the hysteresis controllers used which is based on the model of the multi-level voltage inverter. Finally, the robustness of the developed system will be analyzed with a validation on the Matlab / Simulink environment to illustrate the performance of this command.

I. Introduction

For several years, various control strategies have been developed in order to carry out a decoupled control of the doubly fed induction machine. These methods called “vector controls” provide dynamic performance equivalent to that obtained by the direct current machine. Today, the development of new digital signal processing techniques has led to much more sophisticated control strategies. The most recent steps in this direction are those grouped under the term direct control of the torque.