Abstract: Microgrid cluster technology promotes the collaborative consumption of distributed renewable energy among microgrids through the coordination and complementarity among multiple microgrids, and is considered as an important means for distributed generators to access the grid in the future new power system. Considering the coordination and mutual assistance characteristics of the microgrid cluster, a cloud energy storage operation architecture for the microgrid cluster which realizes the shared use of both centralized and distributed energy storage facilities is proposed. Specifically speaking, centralized energy storage is shared among all microgrids in the microgrid cluster, providing services to all microgrids through collaborative construction and capacity sharing, aiming to reduce the energy storage usage costs of each microgrid. Meanwhile, the distributed energy storage mainly serves various microgrids in the microgrid cluster, with the main goal of ensuring the reliability of each microgrid itself, while also taking into account the demand of coordination and mutual assistance for energy storage reuse. On this basis, a multi-objective two-level optimal configuration model of cloud energy storage driven by economy, low-carbon and reliability is constructed, and the model solution based on the non-dominated sorting genetic algorithm Ⅱ is realized. After that, a business mode for cloud energy storage system in microgrid clusters is established. Based on the Shapley value method and operation simulation, a reasonable allocation of investment, operation costs, and benefits for cloud energy storage systems is achieved, and a method for allocating the initial investment cost of the cloud energy storage is proposed. Finally, based on the IEEE 33-bus system, a microgrid cluster system is built and case studies are carried out. The results show that the proposed method can provide a solution set of cloud energy storage configuration schemes for different investment preferences, and verify the effectiveness of cloud energy storage mode to improve the investment and operation benefits of the system.