Short-term frequency support of power system from wind farms using energy storage system

The high penetration of non-dispatch-able, grid-connected wind power is bringing serious challenge to the frequency regulation of power systems because of the decoupling between the output power of doubly-fed induction generator-based wind farms and the grid frequency. Therefore, this paper proposes a compensation strategy to help wind farms to support the system frequency response by using the energy storage system. Firstly, the conclusion that the wind farm, which is equipped an energy storage system with 5% rated power of wind farm, could have similar short-term frequency response ability as synchronous generators with the same capacity is deduced. Then, a fuzzy logic controller is designed for the energy storage system to achieve this. Simulation results of a simplified practical power system show that wind farms with the proposed compensation strategy could response to the frequency change of power system rapidly and support the short-term frequency regulation effectively under various disturbances.