Modelling and recursive power control of horizontal variable speed wind turbines

The paper deals with the modeling and power control of horizontal variable speed wind turbines using a new recursive controller. The problem considered is to realize a multi-objective control scheme covering the entire wind turbine working domain. The proposed recursive model free controller (RMFC) is designed to realize a compromise between the maximum-power-point trajectory tracking under realistic wind energy exploitation, the desired rotor speed reference trajectory tracking and the need of decreasing the solicitations induced in the mechanical structure of the turbine. The RMFC uses only the turbine output measurement and does not require knowledge of turbine parameters. It has a very simple structure and can be easily implemented in computer control systems. The effectiveness and robustness of the proposed control approach are proven by numerical simulations.