Improved Droop Control Strategy of Battery Energy Storage Participating in Hydropower Primary Frequency Regulation

In this paper, an improved droop control strategy of battery energy storage (BES) participating in hydropower primary frequency regulation based on fuzzy variable droop regulation coefficient is proposed. The setting of droop regulation coefficient fully considers the influence of the change rate of unit active power and the state of charge (SOC) on the charging and discharging power of BES, so that the BES can be adjusted adaptively according to its own electric quantity and system frequency regulation demand in the process of primary frequency regulation. The simulation of an example shows that the strategy can take into account the effect of system frequency modulation and the effect of maintaining the SOC of BES.