Most EV users start charging after returning home from work at 18:00 and the starting time for charging of more than ninety percent of EV users is between 13:00 and 23:00. Therefore, in this case, it takes μ as 18 and takes σ as 5. The probability distribution of the starting time is shown in Fig. 2.4. The initial SOC. The initial SOC of EV battery also presents some certain randomness. Using probability distribution model, it is described as