Research on Frequency Modulation Control Strategy of Battery Energy Storage Assisted Thermal Power Unit Based on SOC Partition

The large-scale grid connection of new energy has an increasingly serious impact on frequency fluctuation. In order to improve the frequency regulation ability of thermal power units, battery energy storage is used to assist thermal power units to participate in grid frequency regulation. Considering the maintenance and recovery requirements of battery energy storage SOC, this paper divides the energy storage SOC into different regions, and proposes an adaptive droop control strategy based on battery energy storage SOC partition to control the adaptive output of battery energy storage, which realizes the complementary advantages of battery energy storage and conventional units. It is verified by Simulink simulation. The results show that the proposed control strategy achieves a good balance between maintaining the SOC of battery energy storage and improving the frequency regulation ability. It effectively utilizes the frequency regulation capacity of battery energy storage and improves the SOC maintenance effect of battery energy storage.