Equilibrium operation strategy for shared energy storage in power system based on the network equilibrium model

Abstract

The integration of renewable energy on a large scale into the grid presents a significant challenge to the secure operation of the electricity supply chain. Shared energy storage (SES), an innovative technology to energy management, has garnered increasing attention for its potential to mitigate the challenges associated with renewable energy integration. This study introduces a multi-period electricity supply chain network model that incorporates SES and examines its operational strategies within a competitive landscape, encompassing scheduling, bidding, and the determination of key energy storage parameters. We also investigate the influence of SES on the electricity supply chain members. The findings reveal that: (1) SES can allocate power judiciously among various users based on demand size, ensuring the electricity needs of multiple users are met. (2) The profit of SES is inversely proportional to the rated power, and it exhibits a trend of initial increase followed by a decrease as the rated capacity of SES expands. (3) SES can significantly increase the consumption of renewable energy from 97.25 % to 99.79 % and concurrently lower the energy costs of users by 0.3626 million Yuan. Moreover, SES can substantially curb the peak load of users by 74.36 MW, thereby alleviating the supply pressure. These findings offer valuable guidance for the broader implementation of SES in future power systems.