Design and performance analysis of fuzzy logic-based speed controller for DTC of VSI fed IPMSM drives

Fuzzy set theory has gained great attention for many researchers due to its several advantages in the area of power electronic systems control. This paper describes the direct torque control of voltage source inverter fed interior permanent magnet Brushless AC motor drives, considering a fuzzy logic-based speed controller which offers robustness against reference speed and/or load torque disturbance effects. In this research study, according to speed error and its first time derivative, the proportional and integral gains of the speed controller are online adjusted. A simulation-based comparative study between the performance of the proposed speed controller and the conventional one, has highlighted the superiority of the developed controller which exhibits fast dynamic response, more robustness and less steady-state error especially when there exist motor parameter uncertainties and unexpected load changes occur.