Velocity controller of a wound rotor induction generator via block control linearization - Second order sliding modes

In this paper, a robust non-linear controller based on block control linearization combined with a second order sliding modes technique called super-twisting algorithm is proposed for controlling a wind power system. The control objectives consist on maximize the wind energy capture by the turbine and keep the stator power factor of a wound rotor induction generator in a set point value. The goal is achieved by controlling the rotor velocity and stator reactive power of the induction generator which is connected to an infinity bus and coupled with a wind turbine across a gear box. The performance of the designed controller is validated through simulations.