A novel direct torque fuzzy control of SVM-inverter-fed induction motor drive

This paper presents an improved direct torque control (DTC) based on fuzzy logic technique. Two major problems that are usually associated with DTC drives are the high torque ripple and switching frequency that varies with operating conditions. To overcome these problems, fuzzy controllers are proposed and associated with DTC scheme. The proposed approach is shown to be able to reduce the torque and flux ripple and to improve performance DTC. The control algorithm is based on the SVM (space vector modulation) technique to provide a constant inverter switching frequency. Furthermore, to verify the effectiveness of this model, a DSP-based experimental induction motor DTC drive system is built.