Day-Ahead Energy Management for Pelagic Island Microgrid Groups Considering Non-Integer-Hour Energy Transmission

Pelagic islanded microgrid groups (PIMGGs) can be developed into resource islands and load islands with the electric vessel achieving the interisland energy transmission. For such multi-microgrid structure, the interisland energy transmission time affected by environmental factors is likely to be non-integer hour (such as 23min), resulting in mismatching with the standard day-ahead scheduling step (1h). However, rounding the transit time may bring about large errors in optimization results, while using an elaborate scheduling step to approach the transit time will result in heavy computing burden due to numerous variables. To address the above problems, this paper proposes a novel day-ahead energy management system (EMS). Firstly, analyzing the impact of environmental factors including wind, ocean current, and wave, a centralized energy management framework considering the non-integer-hour energy transmission is designed. Furthermore, an optimal EMS operation model based on the 1-hour scheduling step is proposed. It eliminates the errors from rounding by coordinating the original and mirror unit commitments. Additionally, the optimization model is converted into a mixed-integer linearization programming (MILP) problem using a two-stage method including preprocessing and linearizing stage. Simulation studies on Taiping Island, Honma Island and Bolan Reef indicate the proposed EMS is effective and beneficial for PIMGGs.