Cloud energy storage can aggregate a large amount of distributed energy storage and centralized energy storage control information. The wind farm can realize the controllability of the output power by renting cloud energy storage and selfbuilt physical energy storage. In order to extend the service life of selfbuilt energy storage equipment, a power allocation strategy is designed. Based on the life cycle cost of selfbuilt energy storage equipment, cloud energy storage energy lease cost, abandoned wind penalty cost, and minimum power shortage penalty cost, the optimal configuration model of the selfbuilt energy storage and the leased cloud energy storage capacity is established for a wind farm. Simulation analysis shows that the energy rental unit prices of different cloud energy storage will affect the cloud energy storage energy utilization, charge and discharge results, thus affecting the optimal configuration capacity of selfbuiltenergy storage. The reasonable allocation of cloud energy storage energy lease and selfbuilt physical energy storage has good economy and practicality.