Back-to-back converters with doubly fed induction generators for wind energy scheme

The paper describes the design of a Doubly Fed Induction Generator (DFIG) connected to the grid through back-to-back converters in the rotor circuit. A vector control oriented with the stator voltage is applied for the grid side converter that is responsible for maintaining the DC link voltage constant regardless of the power flow between the rotor and the grid. A field orientation control with the d-axis aligned with the stator flux is applied for the rotor side converter that is responsible to extract the maximum power from the wind using Maximum Power Point Tracking (MPPT) technique; this is done by decoupling the active and reactive power flow between the stator and the grid. The system is studied under the different wind conditions.