Optimal Charging Strategy for EVs in Microgrid Considering Customer Urgency

With the growing popularity of electric vehicle (EVs) in residential areas and the continuous improvement of charging facilities, it is important to reduce the unwanted effect caused by dumb charging of users to the power grid, and arrange charging behaviors in an orderly manner according to the actual charging needs of users. In response, this paper proposes a two-level optimization strategy for residential areas. In the upper optimization, based on the travel characteristics of residential areas and typical charging scenarios, the optimal charging power in each time period is modeled and solved, and the optimal charging power distribution curve is obtained. In the lower optimization, the charging urgency is calculated according to the received EV state information, and the residential users are guided to conduct orderly charging in combination with the power distribution curve. The typical daily load data and EV charging characteristics of a certain cell are used for example simulation, and the results show that the strategy can effectively suppress the load fluctuation, at the same time better meet the needs of users, and reduce the cost.