Power Management and Control Strategy of Island Energy Supply System Based on Energy Router

Currently, most islands are using diesel generators or heavy oil generators for power supply, leading to unstable and inefficient power supply, as well as serious pollution issues. Islands possess abundant and diverse renewable energy sources (RES). However, due to the lack of advanced equipment and control technologies, RES on the islands has not been fully utilized. In this regard, supported by the Multi-energy Complementary Demonstration Project on Daguan Island in Qingdao, China, this paper proposes a power management and control strategy of island energy supply system based on the energy router (ER). To deal with fluctuations of renewable energy outputs and electricity demand, a switching strategy among the energy supply system operation modes considering multi-power flows and the energy storage system (ESS) state of charge is proposed. Furthermore, to avoid the ESS lifespan reduction caused by the inconsistent degree of battery charging/discharging, a balanced control strategy of battery packs is developed. Finally, simulations are carried out, proving the effectiveness of the proposed power management and control method in fast and balanced control for island energy supply.