Fuzzy immune PID control used in no-load grid-connection for doubly-fed wind power system

With the single unit capacity of wind power becoming larger, the impact current when the wind turbine cut in grid can´t be ignored now, and the grid-connection control technology should be getting attention. The traditional PI controller is sensitive to the model parameters and it does not have the ability of self-tuning when the model parameters vary. In this paper the fuzzy PID system with immune algorithm based on stator flux oriented vector control is proposed. Firstly, the model of doubly-fed induction generator(DFIG) is established. Secondly, in order to dispose of the strong coupling problems, the idea of DFIG stator-flux-oriented vector control strategy is introduced. Then the fuzzy immune PID controller is designed. Finally, the proposed method is simulated with MATLAB/Simulink. The simulation results prove that the proposed strategy have a better capacity of resisting disturbance, enhancing the robustness of the system.