A Two-Layer Fuzzy Control Strategy for the Participation of Energy Storage Battery Systems in Grid Frequency Regulation

To address the frequency fluctuation problem caused by the power dynamic imbalance between the power system and the load when a large number of new energy sources are connected to the grid, a two-layer fuzzy control strategy is proposed for the participation of the energy storage battery system in FM. Firstly, considering the coordination of FM units responding to automatic power generation control commands, a comprehensive allocation strategy of two signals under automatic power generation control commands is proposed to give full play to the advantages of two FM signals while enabling better coordination of two FM units responding to FM commands; secondly, based on the grid FM demand and battery FM capability, a double-layer fuzzy control strategy is proposed for FM units responding to automatic power generation control commands in a coordinated manner under dual-signal allocation mode to precisely allocate the power output depth of FM units, which can control the fluctuation of frequency deviation within a smaller range at a faster speed while maintaining the battery charge state; finally, the proposed Finally, the proposed control strategy is simulated and verified in Matlab/Simulink. The results show that the proposed control strategy can control the frequency deviation within a smaller range in a shorter time, better stabilize the fluctuation of the battery charge level, and improve the utilization of the FM unit.