Research on capacity optimization configuration of distributed photovoltaic energy storage system

Abstract It is necessary to configure the power grid with appropriately sized energy storage equipment to address both economic efficiency and the operation of the regional power grid in a safe and stable manner after large-scale power stations are generated by photovoltaic effect integration. Considering the energy model of energy storage, an optimal configuration method with the lowest annual investment cost of the regional microgrid as the objective function is proposed. In the case conditions, considering the operation investment cost of each device of the microgrid and the optical storage subsidy, the rated capacity and rated power of the energy storage are set to optimize the optimal situation, and the composition of the annual investment cost of the microgrid is analyzed when the two are increased by 40 %. The results indicate that configuring the microgrid with optimal energy storage can significantly reduce power purchase costs and increase the percentage of photovoltaic power generation. However, decreasing the energy storage system’s rated capacity and rated power will lead to higher purchase costs, reduced economic efficiency, and diminished environmental protection benefits.