一种基于SOC的电动汽车充电过程等效电阻模型

An Equivalent Resistance Model of Electric Vehicle Charging Process Based on SOC

电动汽车大规模接入配电网将对电力系统的运行产生显著影响,电动汽车不同充电阶段的充电负荷不同,建立电动汽车充电过程的准确等值模型将为分析其充电带来的影响提供理论依据。文章研究电动汽车充电,分析充电机基于充电功率的充电过程等效非线性电阻模型,进而建立基于电池荷电状态(state of charge,SOC)的等效数学模型,最后将电动汽车充电负荷接入典型低压配电网中,仿真分析了重载方式下电动汽车充电负荷与配电网感应电机负荷对配电网供电的影响,对比分析了充电过程的功率模型和SOC模型的准确性,验证其建模方法具有计算量小、原始参数易获取的特点。

The large-scale access of electric vehicles to the grid will have a significant impact on the operation of the power system.The charging load of electric vehicles at different charging stages is different, so establishing an accurate equivalent model for the charging process of electric vehicles will provide a theoretical basis for analyzing the impact of charging.Firstly, this paper studies the charging of electric vehicles and analyzes the equivalent nonlinear resistance model of the charging process based on charging power of the charger,then an equivalent mathematical model based on state of charge(SOC)of batteries is established.Finally,the charging load of electric vehicle is connected to the typical low-voltage distribution network,and the influence of electric vehicle charging load and induction motor load on the power supply of the distribution network under heavy load mode is simulated and analyzed.By comparing and analyzing the accuracy of the power model and SOC model of the charging process,it is shown that the modeling method proposed in this paper has the characteristics of less calculation and easy access to the original parameters.