Abstract: When the wind speed exceeds the rated value, usually the blade pitch controller will be put into the operation of large-scale wind turbine. Specifically, the blade pitch angle is adjusted to maintain appropriate angle of attacking on the blade. Thus, the aerodynamic torque captured from the wind can be regulated to achieve stable power output. In combination with fuzzy control logic and conventional PI control, this paper proposes the design of fuzzy-PI controller and fuzzy gain-scheduling PI controller respectively. Both controllers are applied in the blade pitch control process for the stabilized power output. Under the Simulink-FAST interface, the proposed strategies were tested on a 5 MW onshore wind turbine model. Simulation results show that the novel controller can significantly shorten the time duration for adjustment and reduce the overshoot such that satisfactory control effect can be achieved under the proposed strategies.

Key words: large-scale wind turbine, blade pitch control, fuzzy rule, PI control, FAST software