Grey-fuzzy implementation of direct torque control of induction machines

A system with fast torque response is very beneficial in applications where direct torque control (DTC) is highly desirable. The principle of DTC is t o control machine torque and flux directly by selecting the switching state s of inverter according to the errors of torque and flux; however, the resp onse of direct torque control is slower during start-up and during change i n load. Fuzzy control with grey prediction strategy is proposed for the imp lementation of DTC to improve its slow response. Moreover, it uses less sen sors than the conventional method. Experimental implementation of the fuzzy logic controller and the grey predictor is carried out to verify the behav ior of the controller. The controller is implemented with a single board co mputer that uses a TMS320C30 DSP.