Predictive functional control of a doubly fed induction generator for variable speed wind turbines

Automatic control is crucial to the efficiency and reliability of wind power generation systems. Predictive functional control for doubly fed induction machine is proposed. The doubly fed induction machine is used in generating mode for large-scale grid-connected variable speed wind turbines. In order to control the active power and reactive power exchanged between the stator and the grid, the rotor is fed by a bi-directional power converter. A dynamic model of doubly fed induction generator (DFIG) written in a d-q reference frame synchronized with the stator flux is established to synthesize controllers and to investigate simulations. The DFIG is controlled by a predictive functional controller whose performances are compared with a traditional proportional integral controller in terms of reference tracking, sensibility to perturbations and robustness. Simulation results verify the effectiveness of the proposed methods.