A modeling strategy for charging loads of large-scale electric vehicles considering multi-days spaced charging mode

This paper presents a modeling strategy for charging loads of large-scale electric vehicles considering multi-days spaced charging mode, which can provide necessary theoretical bases for charging load forecasting and ordered charging control method. Six user sets are firstly suggested according to the daily travel distance. Then, on the basis of a detailed analysis on the probability characteristics of the charging starting time and the charging duration of a single electric vehicle from each user set, a calculation method for the load expectation of a single user set at specified time instant is proposed. After that, the concept of the initial date window is put forward, and the probability distributions of the uses with two kinds of multi-days spaced charging modes in the initial date window are simulated respectively. Finally, based on the law of large numbers, the overall load calculation model and its discrete approach for the aggregated charging load on each workday are proposed. According to the result of example analysis, the strategy can significantly im-prove the battery capacity utilization of large-scale electric vehicles, achieve more accurate charging load characteristics with a good maneuverability, and thus would have consider able application prospects. ©, 2015, Chinese Machine Press. All right reserved.