Double-layer power optimal allocation strategy of energy storage power station considering energy efficiency and battery state

Abstract Electrochemical energy storage is popular in many fields for its quick response and flexible setup. However, at this stage, the cost of energy storage is still high; the source of income is limited, and the profit prospects are worrying. Therefore, this paper proposes a two-layer power optimization allocation strategy for energy storage power stations considering energy efficiency and battery state. Through this strategy, the operation mode of energy storage can be optimized. The single-cycle expenditure for energy storage sees a reduction. The life cycle can be prolonged, and the income can be expanded. The bi-level optimal allocation strategy is divided into the optimization layer of the power storage subsystem and the optimization layer of the unit. At the level of the subsystem, considering the relationship between the load condition of the transformer and its efficiency, the power of each transformer is determined with the minimum total energy loss of the transformer as the objective. At the energy storage unit level, the state of charge and the health of the power storage unit are considered at the same time. The output power of each unit is optimized to ensure consistent battery states and avoid the “shortboard effect”. The simulation results show that the strategy has certain feasibility and effectiveness.