Capacity Determination Method for Energy Storage Plants in Grid-Connected Microgrid

The battery energy storage system is an important part of the microgrid to realize its local consumption value, and plays an important role in balancing the supply and demand relationship of the microgrid. Because the construction and operation and maintenance costs of the battery energy storage system are quite high, and both are in direct proportion to the capacity of the battery energy storage system, a set of calculation methods are needed to determine the capacity and plan the operation, so that the sum of the operation and maintenance costs of the microgrid and the construction costs of the battery energy storage system is the smallest. In this paper, after modeling the bilevel programming problem, the inequality constraint method is used to transform it into a single-level optimization problem, that is, the capacity of the battery energy storage system is deleted during the operation planning process. In other words, the problem will be simplified to be formulated only for the operation schedule. Finally, PSO algorithm is used to solve the problem.