Optimal Operation of a Multi-Energy Island Grid Integrated with a Hybrid LNG-Energy Storage System

Integrated energy systems play a pivotal role in enhancing energy efficiency and attaining dual carbon goals. However, within the integrated energy system development realm, islands have garnered inadequate attention due to their unique geographical positioning. To improve the operational efficiency of an island power grid, the feasibility of connecting islands integrated with multi-energy systems using liquid natural gas (LNG) ships is explored. A novel multi-energy system model with LNG ships is proposed to minimize carbon emissions and enhance stability. Furthermore, the operation is optimized by the interior point method. To verify the proposed method, case studies are conducted on the natural conditions and load scenarios of Yancheng city in Jiangsu Province. The numerical results indicate that the economic costs and carbon emissions were significantly reduced in the LNG ship connected integrated energy system.