Direct Torque Control of a Doubly-Fed Wind Generator Based on Grey-Fuzzy Logic

This paper presents the analysis and design of a Direct Torque Control (DTC) of a Doubly-Fed Induction Generator applied to a wind generation system. The aims of control are the control of reactive power interchanged between the generator and the grid and the control of active power absorbed from the wind turbine in order to track the optimum operation point. The DTC system control generator torque and flux directly, however, the response of DTC is slower during large change in load. Fuzzy control with grey prediction strategy is proposed for the implementation of DTC to improve its slow response. Simulation of the DTC system with grey-fuzzy controller is carried out to verify the control performance.