Direct torque control of induction motors using fuzzy logic with current limitation

Abstract

This work presents a DTC system controlled by a fuzzy logic system that also limits the stator current. The simulation and experimental results are presented for two different stator current limitation strategies. The proposed control scheme uses the fuzzy logic controller to modulate the voltage vector phase applied to the induction motor. This scheme keeps the control voltage vector magnitude almost constant, allowing variations only to limit the stator current. The proposed scheme performance was analyzed using simulation programs written in the C computer language, and the simulated predictions were validated with experimental measurements obtained using a 1 1/2 HP motor driven by a rectifier-inverter system called plataforma, developed by the SIEP Group at Simon Bolivar University.