In view of the secondary frequency modulation of the battery energy storage in regional power systems, an energy storage frequency modulation control strategy based on the fuzzy dynamic distribution is proposed, which solves the contradiction between the system frequency modulation demand and the energy storage SOC reconstruction, giving a full play to the rapid frequency modulation characteristics of the energy storage. First, by analyzing the relationship between sensitivity and frequency bias, the relationship between the best energy storage involved in the frequency modulation depth, i.e. that between the allocation factor value and the frequency deviation. By calculating the sensitivity of the energy storage allocation factor and dynamically adjusting the energy storage control strategy for the allocation factors, the problem is solved that in previous studies it is necessary to develop the reconstruction strategies to maintain the energy storage SOC. On this basis, considering that the continuous output of the energy storage under continuous load disturbance may limit the SOC, we propose a quadratic correction strategy of the energy storage allocation factor based on the ultra-short-term load prediction and the fuzzy control, which is able to perceive the load trends in advance and make a secondary correction for the allocation factor, dealing with the continuous load disturbance with the sufficient capacity of the energy storage reserve. The simulation example of a two-region interconnection system with the battery energy storage verifies the effectiveness of this strategy. © 2023 Power System Technology Press. All rights reserved.
