The Large-Capacity Energy Storage Configuration for New Energy Integration Systems

The large-scale integration of energy storage in renewable energy systems faces several challenges, including incomplete policies, unclear business models, and suboptimal project economics. The gradual reduction of subsidies for wind and solar energy has further increased the financial pressures on enterprises, making energy storage configurations with low returns cost-prohibitive and lengthening investment payback periods. This paper focuses on the “Renewable Energy + Energy Storage” collaborative model, specifically addressing the multi-objective optimization of large-capacity energy storage systems. A comparative study of energy storage system topologies is conducted, considering multi-dimensional performance factors such as economics, reliability, and flexibility, resulting in the development of an optimal topology scheme. Furthermore, the paper explores multi-level state-of-charge (SOC) balancing control strategies, taking into account the charging and discharging characteristics of batteries. The proposed optimization strategies are validated through simulations.