Energy Cooperation Strategy for Island Microgrids Based on Cooperation Alliance

Currently, many island microgrids rich in renewable energy have been established. Some of them are geographically close and have the potential to achieve energy sharing and improve power supply reliability through interconnection. However, the traditional method, laying submarine cables among island microgrids, may lead to issues such as easy damage and poor economy. Therefore, in this paper, an energy cooperation alliance is first proposed. An energy transporter is designed as the initiator of the alliance, achieving inter-island transfer of electricity by dispatching all-electric ships. Secondly, an energy scheduling model is established, including models for island microgrids and the energy transporter. Thirdly, the stability coefficient of the cooperation alliance is presented, and a benefit allocation strategy based on the asymmetric Nash bargaining model is applied. The renewable energy consumption rate and the role imbalance coefficient are considered. Finally, simulation studies on island microgrids in the South China Sea indicate that the proposed energy cooperation strategy is effective and beneficial.