Independence enhancement of distributed generation systems by integrating shared energy storage system and energy community with internal market

Abstract

The connection of large-scale distributed generation systems, primarily distributed solar and wind power, to the public grid, will cause a considerable burden on its dispatching. How to improve the independence of distributed generation systems is crucial. This study thoroughly investigates the possibility of enhancing the independence of distributed generation systems by combining feasible solutions such as integrating energy community, installing shared energy storage, and adopting rational dispatching strategies while ensuring the benefits of multiple parties. A two-level framework for optimizing energy community scheduling and shared energy storage system sizing is proposed. The upper layer uses a multi-objective approach to optimize the size of the shared energy storage system, which ensures the economy of the shared energy storage system and the independence of the energy community. The lower layer dispatches power intending to maximize social welfare and allocates cooperative benefits through the Sharply value method, thus ensuring the interests of community participants. And a dynamic electricity price strategy in response to the imbalance between supply and demand to guide community dispatching is proposed, which reduces the peak-to-valley range while ensuring economic performance. The case results show that compared to the distributed generation systems operating alone, integrating the energy community increased the self-sufficiency and self-consumption rates of the community by 6.01 % and 6.01 %, respectively, and installing shared energy storage system increased the self-sufficiency and self-consumption rates of the community by 13.50 % and 19.35 %, respectively.