Managing risk for unbalanced load situations of three-phase supply systems in charging facilities providing single-phase charging for electric vehicles

摘要

Multi-point charging facilities for electric vehicles often use single-phase connections sufficient for ordinary charging demands. Without an even distribution of charging points across the 3-phase electrical supply, a severe load unbalance could occur, caused by an unfavorable parking pattern and charging time. Users' behaviors affect these patterns, influenced by the physical layout or obstacles. We investigate the load unbalance based on random distribution as well as on simulated parking behaviors assuming varying attractiveness of points. We also examine load unbalance in real-life data from a charging facility in Oslo. We suggest practical considerations for minimizing unbalance situations.