基于改进型VSM的V2G充放电策略研究  

Research on V2G Charging and Discharging Strategy Based on Improved VSM

作　　者：冯富国 王娟娟[1] FENG Fuguo;WANG Juanjuan(Department of Automation and Electrical Engineering,Dalian Jiaotong University,Dalian 116021,China)

机构地区：[1]大连交通大学自动化与电气工程学院,辽宁大连116021

出　　处：《自动化仪表》2022年第12期58-64,共7页Process Automation Instrumentation

摘　　要：实现电动汽车(EV)与电网能量的高效转换,使其具有较高的功率因数和较低的谐波污染,同时减小大规模EV并网时对电力系统产生的冲击,对提高电网运行的安全性和稳定性具有重要意义。在双向虚拟同步机(VSM)控制策略的基础上,通过在电压电流双环控制的电流环中引入超螺旋(ST)二阶滑膜控制(SMC),并通过仿真验证了VSM控制能够有效降低EV并网谐波污染,提高功率因数,提升EV与电网能量的转换效率。与传统比例微分(PI)控制相比,系统鲁棒性更好,能够抑制直流侧母线电压波动,提高系统的动态性能。将改进型双向VSM控制方法应用于EV充放电并网的控制策略中,使EV与电网能量交互时,能够与传统同步发电机一样具有惯性和阻尼性来降低EV并网对电力系统的冲击,并有效减少谐波含量、提高功率因素,实现了EV与电网能量的高效转换。It is of great significance to improve the safety and stability of grid operation by realizing the efficient conversion of electric vehicle(EV)to grid energy with high power factor and low harmonic pollution,while reducing the impact on the power system when large-scale EV are connected to the grid.Based on the bidirectional virtual synchronous machine(VSM)control strategy,the super twisting(ST)second-order sliding mode control(SMC)is introduced into the current loop of its voltage and current dual-loop control,and it is verified through simulation that VSM control can effectively reduce the harmonic pollution of EV grid connection,improve the power factor,and enhance the conversion efficiency of EV and grid energy.Compared with the transfer proportional differentiation(PI)control,the system has better robustness,can suppress the DC-side bus voltage fluctuation,and improve the dynamic performance of the system.The improved bidirectional VSM control method is applied to the control strategy of EV charging and discharging to the grid,so that the EV can interact with the grid energy with the same inertia and damping as the traditional synchronous generator to reduce the impact of EV to the power system,and effectively reduce the harmonic content,improve the power factor,and realize the efficient conversion of EV to the grid energy.

关 键 词：新能源 电动汽车 充电桩 虚拟同步机 电网能量交互 超螺旋二阶滑膜控制 电压电流双闭环 谐波污染 

分 类 号：TH-39[机械工程]