Li Haidong

Modeling and Control of Variable Pitch and Variable Speed Wind Turbine

A dynamic model of variable pitch and variable speed wind turbine was developed. This model can be used simulate wind turbine and design pitch and toque controller. The research work presented in this paper is aimed to reduce pitch actuator fatigue and smooth output power above-rated power operating condition. To cope with the nonlinear characteristics of wind turbine and reduce the pitch actuator fatigue, a new control strategy for variable pitch variable speed wind turbine is proposed. In the proposed method a variable gains PD controller based on fuzzy control theory is used. The inputs of fuzzy controller are rotor speed and pitch angle. A comparison with purposed strategies and PI controllers is performed. Simulation result show that the proposed approach results in better power regulation and less pitch action. The proposed strategy is easy to realize and has stronger robustness.