Application of fuzzy logic for a ripple reduction strategy in DTC scheme of a PWM inverter fed induction motor drives

Abstract EN

This paper deals with the direct torque control (DTC) of the induction motor.

This type of control allows decoupling control between the flux and the torque without the need for a transformation of coordinates.

However, the DTC scheme has a high ripples for both electromagnetic torque and stator flux and a distortion of the stator current.

To solve these problems, we have developed a new approach of DTC scheme making use of both the technique of space vector modulation (SVM) and the hysteresis comparator.

The choice of the angle of the voltage vector applied to the motor is operated by a look-up table, while the voltage vector amplitude is calculated by an estimator based on fuzzy logic.

Finally, the reference voltage vector will be synthesized using the space vector modulation.

The main objective of this study is the reduction of electromagnetic torque ripples.

Moreover, this approach allows the reduction of stator flux ripples as well as improving the form of the stator currents.

Simulation results will illustrate the performance merits of our approach.