Charging pile access control mode and strategy for substation area

Large numbers of private electric vehicles (EVs) will connect to the charging pile for battery charging in a centralized period, thus bringing a high load pressure on the local distribution network. To reduce the impact while satisfying the total charging demand, coordinated charging should be carried out. A substation-area charging pile access control mode is proposed, and a two-stage dispatch strategy is provided through an analysis of the charging pattern of private EVs in the residential area. First, a charging pile accessing strategy is proposed with meeting the total charging demand as the constraint and the distribution transformer capacity balancing the substation load as the objective. Second, a distributed strategy objective to balance the line load rate is proposed and the best dispatch scheme of charging pile in each residential quarter is achieved. The optimized dispatch model is simulated under different scenarios in the substation area, and the peak-valley and grid parameters of different operation modes are researched. Results show that the dispatch strategy is rational and effective, and suggestions for the distribution network reconstruction are provided.