摘要
在大功率电动汽车充电系统中,PWM整流器对系统稳定运行有重要影响,为有效改善充电级联系统的稳定性,本文基于Middlebrook准则研究了LCL型PWM整流器的闭环输出阻抗特性,分析了影响阻抗特性的相关因素。并针对在充电控制系统中采用母线电压小信号反馈的方式引入虚拟阻抗提高系统稳定性导致电网侧电流谐波增加的问题,本文提出了一种变参数控制的虚拟阻抗控制方法,在提高直流侧系统稳定性的同时,又抑制了网侧电流谐波的增加。最后通过仿真和实验验证了所提方法的正确性。
In the high-power electric vehicle charging system,the PWM rectifier has an important influence on the stable operation of the system.In order to effectively improve the stability of the charging cascade system,this paper studies its closed-loop output impedance characteristics of the LCL-type PWM rectifier based on the Middlebrook criterion,and analyzes the relevant factors affecting the impedance characteristics.And aiming at the problem of the increase of grid-side current harmonics caused by the introduction of virtual impedance in the charging system with the bus voltage small signal feedback method to improve system stability,this paper proposes a virtual impedance control method controlled by variable parameters,which improves the stability of the DC side system while suppressing the increase of grid-side current harmonics.The correctness of the proposed method is verified by simulation and experiment.
作者
常征
曾四鸣
李秉宇
杜旭浩
崔顺尧
杜庆诚
肖国春
CHANG Zheng;ZENG Si-ming;LI Bing-yu;DU Xu-hao;CUI Shun-yao;DU Qing-cheng;XIAO Guo-chun(State Grid Hebei Electric Power Company, Shijiazhuang 050021, China;State Grid Hebei Electric Power Research Institute, Shijiazhuang 050000, China;Xinji Power Supply Branch, State Grid Hebei Electric Power Co.Ltd., Shijiazhuang 052300, China;School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China)
出处
《电工电能新技术》
CSCD
北大核心
2021年第8期32-42,共11页
Advanced Technology of Electrical Engineering and Energy
