LVRT and power smoothening of DFIG-based wind turbine systems using energy storage devices

This paper proposes a ride-through technique of doubly-fed induction generator (DFIG) wind turbine systems. The control technique uses energy storage devices (ESD) which are controlled with current and power control loops. During grid faults, the generator output power can be reduced by increasing the generator speed, resulting in increased inertial energy of the rotational body. Also, the output power fluctuation of the generator due to wind speed variation is smoothened by controlling the ESD appropriately. The PSCAD/EMTDC simulation results have proved the effectiveness of the proposed algorithm.