基于实时最优恒定功率的电动汽车有序充电策略

大规模电动汽车无序接入充电会与电力系统基础负荷"峰峰相叠",加大系统峰谷差,造成配电变压器重过载和系统网损增大等后果,从而威胁电网的安全运行.为了实现电动汽车有序充电,在以负荷波动差作为网损分析指标的基础上,提出基于实时最优恒定功率的电动汽车有序充电模型.根据常规负荷预测曲线和电动汽车充电基础数据求解实时最优恒定功率,在满足配变最大容量等约束的前提下,以系统负荷波动差最小为目标形成电动汽车有序充电方案.最后通过MATLAB平台作算例仿真,以IEEE 33节点系统为例的仿真结果表明:所提有序充电策略能够更有效地实现系统负荷"移峰填谷",达到平抑负荷波动和降低系统网损的目标,从而验证了该策略的有效性.

Ordered charging strategy of electric vehicles based on real-time optimal constant power

Large-scale electric vehicles charging in disorder will overlap with the basic load of power system, increase the peak valley difference of the system, cause the heavy overload of distribution transformer and the increase of power system network loss, thus threatening the safe operation of power grid. In order to realize the orderly charging of electric vehicles, based on the load fluctuation difference as the network loss analysis index, a real-time optimal constant power orderly charging model of electric vehicles is proposed. According to the conventional load forecasting curve and the basic data of electric vehicle charging, the real-time optimal constant power is solved. On the premise of meeting the maximum capacity of distribution transformer and other constraints, the orderly charging scheme of electric vehicles is formed with the goal of minimizing the load fluctuation difference of power system. Finally, the simulation results of IEEE 33 bus system with MATLAB platform show that the proposed orderly charging strategy can more effectively achieve the goal of "peak shifting and valley filling", achieve the goal of stabilizing load fluctuation and reducing system network loss, thus verifying the effectiveness of the strategy.