Coordinated Control Strategy and Capacity Optimization Configuration of Thermal Power-Energy Storage Joint System Based on FESS in Primary Frequency Regulation

With high instantaneous power, short response time, and long life cycle, flywheel energy storage has been widely noticed and applied in the field of auxiliary participation of energy storage systems in grid frequency regulation. The participation of flywheel energy storage in primary frequency regulation can effectively share the frequency regulation pressure of thermal power units, improve the frequency safety of the power grid, and is of great significance for improving the frequency regulation performance of the system. Firstly, virtual droop inertia coordinated control strategy based on low-pass filtering for automatic allocation of fire storage power and considering the state of charge of energy storage for fire storage joint primary frequency regulation was designed to achieve power coordinated allocation in the fire storage joint system; Secondly, considering the system's frequency regulation performance, operational costs, and frequency regulation benefits, a collaborative optimization model for primary frequency regulation based on the PSA algorithm was established to achieve capacity configuration and control parameter optimization of flywheel energy storage under coordinated control strategy. Finally, simulation verification was conducted, and the results showed that the proposed coordinated control strategy and capacity configuration collaborative optimization method could effectively reduce system frequency deviation, improve the frequency regulation performance of the fire storage joint primary frequency regulation system, reduce the action amplitude of thermal power units, effectively alleviate the pressure of unit frequency regulation, and improve system economy, promoting the safe and economic operation of the system.