基于柔性互联配电网的大规模电动汽车接入影响研究

Research on Impact of Large-scale Electric Vehicles Access Based on Flexible Interconnected Distribution Network

近年来,伴随着电动汽车的大规模发展,充电设施的规划建设和充电负荷的接入给配电网的安全稳定运行带来不可忽视的冲击性影响。以电力电子化的配电网改造趋势愈加成形,代表以柔性互联技术兼具开闭环运行优势,满足电动汽车时空随机性负荷的接入需求。针对柔性互联下的电动汽车接入影响进行评估,以适应未来电动汽车大规模接入发展形式。根据柔性互联原理建立基本数学约束模型;在考虑不确定性影响下,以充电功率、充电需求和充电时间分布三方面因素进行电动汽车负荷建模;在IEEE 33系统中测试并量化分析网间潮流均衡分布情况和整体电压偏差水平。

In recent years,with the large-scale development of electric vehicles,the planning and construction of charging facilities and the access of charging load have brought impact on the safe and stable operation of distribution network.The trend of power electronic distribution network transformation is more and more shaped,which means that flexible interconnection technology has the advantages of open-loop and closed-loop operation to meet the access requirements of electric vehicles with spatiotemporal random loads.The impact of electric vehicle access under flexible interconnection was evaluated to adapt to the development of large-scale access of electric vehicles in the future.Based on the principle of flexible interconnection,the basic mathematical constraint model was established.Considering the influence of uncertainty,the electric vehicle load was modeled by charging power,charging demand and charging time distribution.The power flow equilibrium distribution and the overall voltage deviation level were tested and quantitatively analyzed in IEEE 33 system.