The second approach is called “Spread Energy With Priority” (SEWP), and consists in spreading the energy to be still supplied to the user over the entire time period available before the user leaves the system. In this case, the charging rate is calculated as CR = ER(t)/TR(t). Simulations were performed to evaluate the impact of the MEWP and SEWP approaches for the six vehicles of Table 1. As shown by results in Tables 2 and 3, the two smart approaches lead to a significant increase in both the degrees of user satisfaction and the total profit of the utility with respect to the FR-FCFS strategy because of a better exploitation of the grid potentiality. Fig. 2 clearly evidences that the total allocated power by using MEWP and SEWP is almost equal to the maximum power available from the grid for
the greater part of the process. The comparison between data in Tables 2 and 3 shows that the MEWP and SEWP methods are almost equivalent when a unitary constant charging efficiency is assumed. In the next section, the impact of the charging efficiency will be analyzed.