Direct transient control of wind turbine driven DFIG for low voltage ride-through

Wind energy penetration to the power market has been continuously increasing over the past decades. High penetration level requires the wind energy generation to be more reliable. For wind farms equipped with doubly fed induction generators (DFIGs), a successful low voltage ride-through scheme has been a key issue to achieve reliable and uninterrupted wind energy generation. This paper proposes a new current control scheme, called ldquodirect transient current control (DTCC),rdquo as a solution to the low voltage ride through problem. This new scheme adds two additional feed-forward transient compensation terms to a regular decoupling current regulator. These transient terms compensate for the transient effects of stator terminal voltage dips on the rotor currents. Simulation results show that this control scheme could help limit the transient rotor current oscillations, keep the wind turbine DFIG system connected to the power grid, and thus maintain uninterrupted active and reactive power supply to the power grid.