Application of feedback linearization method to wind turbines with PMSG for extracting maximum power from wind energy

In this paper it is proposed a state feedback linearization method for a wind turbine equipped with a permanent magnet synchronous generator (PMSG), in order to extract maximum power from wind energy. The method is based on Lie derivatives and has several advantages as: adjusting the power coefficient of wind turbine as close as possible to its maximum value, obtaining the optimal tip speed ratio of wind turbine, along with maintaining the generator speed at optimum value. For the state linearized feedback controller design (determining the parameters vector) it was used the pole-placement method. For the classic maximum power point tracking (MPPT) control structure, a PI controller is synthesized with the Matlab PIDtune program. For wind turbine with PMSG of 2 MW, based on the model built in Matlab, the results obtained with state feedback linearization method are presented. These results are compared with those obtained with the classic MPPT control structure.