Fuzzy PID controller used in yaw system of Wind Turbine

Yaw system plays an important role in wind turbine generator because of the direction and intensity of wind is time-varying. Because the model of yaw system is difficult to be set up and some parameters of controller are uncertain. General PID controller is not suit for all operation scope. This paper presents a fuzzy PID controller to deal with the control of yaw system with disturbances and uncertain factors. To provide a better tracking effect for system, an approach of fuzzy PID rule is adopted, which PID parameter is adjusted by fuzzy rule when wind turbine generator is operating. Simulation results show that using the present scheme combining conventional PID with fuzzy control, the yaw system can posses better tracking characteristics than PID controller does.