光伏-直流智能充电桩有序充电策略与应用效果

Orderly Charging Strategy and Application Effect of PV-DC Intelligent EV Chargers

在双碳目标的指引下,建筑屋顶可作为分布式光伏的重要场景,同时汽车电动化是交通领域减碳的关键举措。然而,大量光伏出力和电动汽车充电需求在时间上的不匹配,给电网稳定性带来较大压力。提出一种光伏-直流智能充电桩的有序充电策略,在满足充电需求的基础上,减少外网供电,可有效提高光伏自消纳能力和负荷满足率。以北京市某办公建筑为例,通过实验测试和模拟计算,分析了不同天气条件下系统运行效果。结果表明,该充电策略可以完全利用建筑光伏满足电动汽车充电需求,无须向外网取电,即负荷满足率可达100%。与传统恒功率充电方式相比,光伏消纳率提高了42%,光伏最大并网功率下降了54%,为建筑光伏高效利用和交通领域电气化提供借鉴和参考。

To achieve the goal of carbon peaking and carbon neutrality,building rooftops can be an important scenario for distributed photovoltaics,and electrification of vehicles is a key measure for carbon reduction in the transportation sector.However,the large amount of photovoltaic output and electric vehicle charging demand are mismatched in time,which puts great pressure on the stability of the power grid.This paper proposes an orderly charging strategy for photovoltaic-direct current(PV-DC)intelligent charging station,which can reduce external power supply while meeting charging demand,thus effectively improving the photovoltaic self-consumption capacity and load satisfaction rate.Taking an office building in Beijing as an example,the system performance and technical advantages under different working conditions were analyzed through actual testing and simulation calculations.The results show that the proposed strategy can fully utilize the building photovoltaics to meet the electric vehicle charging demand without the need for external power supply.The load satisfaction rate can reach 100%.Compared with the traditional constant power charging method,the photovoltaic self-consumption rate increased by 42%,while the maximum photovoltaic grid-connected power decreased by 54%.The proposed strategy can provide a reference and guidance for the efficient utilization of building photovoltaics and the electrification of the transportation industry.