Abstract: In September 2020, China proposed to striving to achieve carbon neutrality by 2060. It is an important way to achieve carbon neutrality by vigorously developing a power system with high penetration of wind and photovoltaic (PV) solar energy. Due to the fluctuating and intermittent nature of new energy power generation, it is necessary to improve the flexibility of the power system to guarantee the safe, stable and economic operation of the clean energy power system. With the 2060 carbon neutrality target as the boundary and an incorporated 8760-hour-time-series operation simulation model, we optimize the new energy power, energy storage and grid interconnection capacity from different time and space scales, considering various flexibility resources constraints, thereby offering a viable way to carbon neutrality. On this basis, the sensitivity analysis on wind and PV power curtailment, wind and PV power capacity, energy storage and grid interconnection capacity are completed to further demonstrate the effectiveness of the proposed model and method, and the benefits of coordinated supply-grid-storage planning are quantitatively analyzed for the high new energy penetrated power system.

Key words: carbon neutrality, flexibility resource, supply-grid-storage, coordinated optimization