Coordinated control strategy for frequency support of wind farm augmented with energy storage system

Abstract Owing to the uncontrollable and intermittent nature of wind resources, the frequency support capability of wind turbine generators has strong uncertainty. Employing energy storage systems could improve the frequency support capacity and stability of wind farms. This paper proposes a coordinated control strategy wherein wind power and energy storage collaboratively engage in frequency support operations. At the wind farm and energy storage level, the energy storage gives priority to providing the basic part of the incremental active power, and the wind turbine kinetic energy only takes the deficit. At the wind turbine level, the active power support capacity (APSC) of doubly fed induction generator (DFIG) units is proposed, based on which the coordinated control among wind turbines is designed. Simulation results are presented to validate the effectiveness of the proposed methodology.