Maintaining offshore wind farms (OWFs) is essential to ensure stable power production, but poses significant logistical and operational challenges due to the harsh marine environment, making it complicated to transport technicians and equipment.
This study introduces the problem of finding the route and assignment of technicians minimizing the total time required to complete all scheduled maintenance tasks at OWFs under three concurrent assumptions: (1) the compatibility of technicians’ skill-set and the maintenance task to be performed, (2) technicians’ routing in the form of drop-off and pick-up, and (3) synchronized two-echelon system, composed of accommodation vessel (AV) and crew transfer vessels (CTVs). Together, these assumptions create a realistic and operationally meaningful foundation for the problem. Skill-task compatibility ensures that only appropriately qualified technicians are assigned to each maintenance job, reflecting real workforce constraints. Modeling technicians’ movements as coordinated drop-off and pick-up routes cuts idle time of the vessels, as service times at turbines are typically much longer than the short travel times between them. Finally, the synchronized two-echelon system addresses the long commute distance from shore, enhancing operational efficiency.
The problem is modeled as a mixed integer linear program (MILP) model that accounts for various types of vessels and allows technicians to continue working independently after being dropped off. Finding feasible solutions to this problem is challenging, and solving it to optimality is extremely computationally complex. Thus, an adaptive matheuristic is designed to find high-quality solutions efficiently. Preliminary experiments on test instances based on Norwegian OWFs demonstrate that the proposed method yields robust and near-optimal solutions. We have also compared this method to a genetic algorithm that is adjusted to solve this specific problem and observe that, in most cases, the adaptive matheuristic reached better solutions with higher robustness. The impact of technician availability is also analyzed, showing that reducing crew size can significantly affect total operation time.
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