计及多日一充模式的规模化电动汽车充电负荷建模策略

A Modeling Strategy for Charging Loads of Large-Scale Electric Vehicles Considering Multi-days Spaced Charging Mode

提出了一种计及多日一充模式的规模化电动汽车充电负荷建模策略,为电动汽车充电负荷预测及有序充电控制措施的制定奠定必要的理论基础。该策略首先依据日行驶里程差异划分了6个用户类,并在详细分析各用户类中单个用户充电起始时刻和充电时长概率特性的基础上,提出了单个用户在指定时刻充电的负荷期望值的计算方法;然后提出了元日期窗口的概念,并分别模拟了两类多日一充模式下各用户类中的用户在元日期窗口内充电的概率分布;最后基于大数定理提出了规模化电动汽车在各工作日内集群充电的总充电负荷计算模型及其离散处理方法。算例分析结果表明,该策略可显著提高规模化电动汽车电池容量的利用率,可获得更为准确的充电负荷特性,且操作性强,因而具有广阔的应用前景。

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.