This paper considers a microgrid system consisting of multiple subnets distributed in different geographical locations, each with its own energy production and energy load, which are interconnected and connected to the power grid through a Point of Common Coupling (PCC). In such a microgrid system, the subnets can operate collaboratively, and the energy regulation of the microgrid requires mutual coordination and information exchange among multiple subnets. Therefore, the microgrid system can better achieve effective integration of resources and reasonable allocation and utilization. However, due to the complex structure and energy interaction characteristics, the energy management of microgrid systems is particularly important. Therefore, this paper focuses on the study of energy optimization and regulation methods for microgrid systems containing multiple interconnected subnets to address the negative impact due to the operational uncertainties of renewable generation and demands in the integrated energy systems and collaborate with multiple interconnected subnets to ensure operational efficiency and energy supply reliability of the microgrid system.