Indirect vector control of a squirrel cage induction generator wind turbine

The paper deals with a squirrel cage induction generator connected to the grid through a back-to-back converter driven by vector control. The stator-side converter controls the generator torque by means of an indirect vector control scheme. In order to reduce the system dependance from the mechanical system behavior, a torque loop is used in the current reference calculations. Moreover, a torque control is included in the stator-side control in order to overcome a voltage dip fault. The grid-side converter controls the DC bus voltage and the reactive power in order to accomplish the grid codes. The proposed control strategy is evaluated by the simulation of different scenarios such as variable wind speed and different levels of voltage sags by means of Matlab/Simulink®.