Coordinated Control Strategy of the Battery Energy Storage System for Wind Power Dispatching

Incorporating battery energy storage system (BESS) into a wind farm can mitigate wind power fluctuations as well as grid-side voltage variations, and the controllability of the wind farm can be improved accordingly. In this paper, a coordinated control strategy for the charge/discharge time (CDT) and the active and reactive power outputs of the BESS is proposed for a combined wind-storage system. First of all, a multi-mode reactive power control scheme is proposed to regulate the grid-side voltage, the reactive power output, and the power factor, considering the power converter system sizing limit. Then a coordinated control strategy for the BESS based on a variable filter time is proposed to satisfy both the active and reactive power control requirements, considering an optimal CDT for BESS efficiency improvement. Finally, the effectiveness of the proposed control strategy is verified by actual data from a wind farm in eastern China.