A non-linear control of power wind turbine based on Doubly Fed Induction Generator

The efficiency of the wind power conversion systems can be significantly improved by the judicious choice of the control algorithm. To maximize the power extraction of a Doubly-Fed Induction Generator (DFIG) based wind turbine, we propose a non-linear control algorithm, based on a sliding mode theory. It has been used to control the wind turbine speed so that it reaches the desired value which corresponds to the maximum power point. For a great capacity to generate very good quality waveforms, the machine is connected to the grid via multilevel converter. To be able to easily control the wind turbine power generation, we will realize an independent control of generator stator active and reactive power. The control system adopts the oriented flux. Simulation tests are established using MATLAB-Simulink. Analysis of simulation results confirms the validity of the proposed strategy.