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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.