Design Of The Pitch Controller Based On Wind Turbine Aerodynamic Model

Wind power as a solution to the problem of human survival and development. The governments of all countries in the world take more and more attention on it, because it is a kind of new energy for sustainable development, not only can save energy, reduce environmental pollution, but also has good economic benefit and social benefit.Wind turbine generator consisted by impeller, transmission device, different characteristics components, it becomes to a complex nonlinear system. Therefore, for the establishment of wind turbine the nonlinear characteristics of the control system is vital for safety and efficiency. Based on the deep research on wind turbine aerodynamic characteristics is proposed on the basis of the new variable pitch control strategy.PI controller is widely used in industrial control, because the wind wheel strong nonlinear aerodynamic characteristics at different wind speed, single PI controller is difficult to achieve control result satisfactory. Based on the analysis of wind characteristics and wind power system is simplified, built above rated wind speed and pitch angle of the nonlinear model, according to the wind speed changes using optimization method the linear partitions, for each linear partition design a simple PI controller and the regulation of its parameters to meet the control requirements. Simulation results show that the algorithm is simple, multiple partition PI, in different wind speeds and has better control effect.PI controller switching process will produce large disturbance. In this paper, and then to multiple PI controller based on the partition, the PI control parameters by linear interpolation, design a continuous PI controller, the PI controller switching process into the parameters of continuous adjustment, overcomes the impact of controller switching. Take the300KW wind turbine as simulation experiments, results show that continuous PI control have more ideal performance than the single PI control.