Optimal Allocation of Shared Energy Storage Considering Zonal Power Self-balancing

In order to solve the problems of unclear service scope of shared energy storage and redundant allocation of energy storage on the new energy side, an optimal allocation method of shared energy storage considering regional power self-balancing is proposed. Firstly, a shared energy storage area division indicator including modularity indicator and power balance indicator is proposed. Secondly, the shared energy storage area division problem is abstracted into a graph theoretic model, and the community discovery Girvan-Newman algorithm is used to realize the shared area division of the transmission network. And then, a shared energy storage siting and capacity determination model based on the shared area division is set up to realize the optimal allocation of shared energy storage across the whole network. Finally, the effectiveness of the methodology in this paper is verified by comparing and analysing the shared allocation scheme with the source-side fixed-ratio allocation scheme, using the actual power grid of a coastal province in the eastern part of China as an arithmetic example.