Realistic QoS Optimization Potential at Commercial EV Charging Sites through Pricing-Based Prioritization

At present, EVs are emerging at a fast pace. This may cause pressure for commercial buildings to offer electric vehicle (EV) charging services for their customers. In a cost-efficient charging site, it is necessary to find a balance between the costs and the offered quality of charging service (QoCS). This may be a difficult task as the charging requirements of the customers are unpredictable and vary daily. In this paper, an algorithm using a charging price-based prioritization is proposed and discussed. This can be used to take unpredictable charging requirements into account and to improve the QoCS while requiring a minimal effort from the EV users. To ensure an improvement in the QoCS and the practicality of its implementation, the algorithm is tested using hardware-in-the-loop simulations with two commercial EVs and real charging data. The results verify that the QoCS can be improved by 2% on average and by up to 16% for a single EV user. This leads to a more attractive and more cost-efficient charging site.