Dynamic modeling and constant power control of wind turbines with trailing-edge flaps

The wind turbine systems with trailing-edge flaps have broad prospects in application of large-scale wind turbine system. In the smart wind turbines with variable trailing-edge flaps, the aerodynamic characteristics of the blades can be regulated by using the trailing-edge flaps, and then the purpose of the constant power output of the wind turbines can be achieved. In this paper, the aerodynamic model of wind turbine blades with variable trailing-edge flaps is presented firstly by blade element moment method. Then a nonlinear dynamic model of smart wind power system is established. The nonlinear model is linearized by dynamic inversion method. Based on the linearized model, the feedback controller is designed through H_∞ control. Finally, simulations are carried out for cases with 12-16 m/s step wind and actual wind based on four component model. Simulation results show that the control strategies are capable of controlling output power of wind power system effectively.