Gain scheduling PD controller for variable pitch wind turbines

This paper analyses the theory of variable pitch wind turbines, and according to the works of various parts of the wind turbine, establishes the mathematical model of the aerodynamic part, the drive part, the operative part and the whole unit. An algorithm is proposed to allow the generator to track the maximum power points of the wind turbine system when the wind speed is below the rated value and control the pitch angle to keep the output active power under the rated power when the wind speed is above the rated value by the gain scheduling PD controller. The proposed algorithm has been simulated in the main controller of SIMATIC MICROBOX PC, and good control results are achieved.