In the context of the construction of new power systems, it is an important technical issue to consider the composite functions and application scenarios of new energy storage, and to demonstrate the planning and configuration scale and coordination of energy storage from the overall perspective of the system. This paper takes the coordination planning and layout of new energy storage for complex AC and DC power grids as the background, proposes a new system-level energy storage layout planning two-stage method. In the first stage, the optimization goal is to improve the new energy consumption capacity of the system, ensure the lowest overall cost of system planning and comprehensive operating cost, and preliminarily determine the overall energy storage configuration scale of the system. In the second stage, overall consideration is given to solving the consumption problems of new energy collection areas and delivery capacity of external delivery channels, network blockage in load-intensive areas, and system transient stability, the installation location and layout scale of new energy storage is optimized, and relevant models and processes of the method are provided. Finally, based on the complex AC and DC power grid planning of a province in 2025, a case study is carried out on the configuration scale and layout of energy storage in a compound scenario, which verifies the effectiveness of the model and method.