Flexible energy storage power station with dual functions of power flow regulation and energy storage based on energy-sharing concept

Abstract

The high proportion of renewable energy access and randomness of load side has resulted in several operational challenges for conventional power systems. Firstly, this paper proposes the concept of a flexible energy storage power station (FESPS) on the basis of an energy-sharing concept, which offers the dual functions of power flow regulation and energy storage. Moreover, the real-time application scenarios, operation, and implementation process for the FESPS have been analyzed herein. Subsequently, a method involving a bilevel optimization model was adopted: by replacing the original energy storage capacity at each end of the source, grid, and load with the FESPS, the energy storage capacity was fully released. Finally, a case study was performed to verify that the proposed FESPS based on the energy-sharing concept can effectively promote the on-site consumption of renewable energy, reduce the configuration capacity of energy storage equipment, and realize the function of energy storage/reuse. Notably, the application of FESPS in different application scenarios of the power grid is conducive to promoting the construction of new power systems. Configuration capacity of FESPS is only 70% of that of conventional power stations featuring shared energy storage.

Keywords

• Sharing concept
• Power flow regulation
• Flexible energy storage
• Bilevel optimization