When the equipment within the source-storage integrated system cannot meet the load demand, it is necessary to purchase electricity from the higher-level power grid. Conversely, when the load demand is met, and there is surplus electricity, profits are obtained by selling it to the higher-level power grid.
Shared energy storage is applied to integrated energy systems, providing power auxiliary services to renewable energy and power grids within a certain region through interconnection, coordinated control, and overall management of power devices at different levels.
The cost function for interaction between the source-storage integrated system and the higher-level power grid is as follows: (20) C a, t = λ t in P buy, t P sell, t where P buy, t and P sell, t represent the power purchased from and sold to the higher-level power grid during period t, respectively.
The energy storage system can maintain the state of charge for the initial operation with a fluctuation of about 0.5, allowing it to move on to the next dispatch period. Under Scenario 4, energy storage is used throughout the period and is not idle.
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