Research on Frequency Modulation Control Strategy of Power System Based on Optimized Design of Energy Storage SOC

Due to the frequent occurrence of system frequency security problems caused by integrating wind power generation into the grid, new frequency Modulation measures are urgently needed. To ensure the economy and safety of power grid operation, it is necessary to provide energy storage systems for wind farms. In this paper, energy storage batteries are utilized to participate in the primary and secondary frequency Modulation of the power system, and an equal-proportion control algorithm for improving the SOC imbalance of energy storage batteries was proposed. This algorithm can jointly determine how the power deviation signal generated by frequency Modulation is reasonably distributed to each energy storage battery unit based on the different SOC of each battery unit of the energy storage battery and its operating status (charging and discharging) so that the energy storage battery can not only support the frequency Modulation of the power grid but also improve the imbalance problem of its own SOC. The simulation results reveal that using energy storage batteries to regulate frequency can well meet the active frequency support capability of the new power system, and introducing the equal-proportion control algorithm can also improve the imbalance problem of SOC.