Adaptive Control Strategy for Primary Frequency Regulation of Energy Storage Battery Banks with SOC

Abstract

In view of the frequency fluctuation caused by the power dynamic imbalance between power system and load when a large number of new energy sources are connected to the grid, this paper proposes a balanced operation strategy that takes into account the demand of grid frequency regulation, the state of charge (SOC) of energy storage batteries and the participation of multiple battery energy storage systems (BESS) in frequency regulation. The primary frequency regulation adaptive control strategy. The strategy is based on the demand of grid frequency regulation, firstly, the frequency deviation is partitioned to determine the throughput flow of battery power, secondly, the adaptive regulation of frequency regulation is achieved based on sag control for single group of BESS in different SOC states, and at the same time, considering the uneven power output of multiple groups of BESS participating in frequency regulation, balanced control is introduced on the basis of single unit frequency regulation to achieve the liaison and cooperation of multiple units of frequency regulation. Finally, based on Matlab/Simulink platform, the simulation verifies the correctness and effectiveness of the mentioned adaptive control strategy.