Joint Planning of Multi-Type Energy Storages and Flexible Resources for High-Penetration Renewable Energy Integration

With the large-scale integration of renewable energy, how to balance the power supply and demand economically and effectively has become an important issue for power systems. Under this circumstance, it is necessary to consider the utilization of flexible resources (FRs) in power system planning. In this paper, a joint planning method of multi-type energy storage systems (ESSs) and flexible resources is proposed, considering the seasonal energy balance of power systems, different balance periods of ESSs as well as the differences of flexibility of FRs among multiple days. Firstly, several typical demand-side flexible resources are modeled, and an aggregate boundary model is adopted to unify the various flexible resources into aggregate feasible region. Then, a planning model for multi-type ESSs and FRs is proposed, which embeds an annual operation simulation of the power system. Energy of ESSs is separated into inter-day energy and intra-day energy to describe the seasonal energy balance of the power system. Thirdly, an acceleration strategy based on hierarchical clustering is proposed. Finally, the proposed method is tested using HRP-38 system. Simulation results verify the effectiveness of the proposed method.