充电站直流微网虚拟直流电机控制策略及其动态特性分析  

Virtual DC generator control strategy and its dynamic analysis of DC charging station microgrid

作　　者：刘玲 林刚 焦世青 安柏楠 李勇[2] 王姿雅[2] 王绍阳 LIU Ling;LIN Gang;JIAO Shiqing;AN Bonan;LI Yong;WANG Ziya;WANG Shaoyang(Power China Jiangxi Electric Power Design Institute Co.,Ltd.,Nanchang 330000,China;College of Electrical and Information Engineering,Hunan University,Changsha 410082,China)

机构地区：[1]中国电建集团江西省电力设计院有限公司,江西南昌330000 [2]湖南大学电气与信息工程学院,湖南长沙410082

出　　处：《电力系统保护与控制》2020年第11期28-35,共8页Power System Protection and Control

基　　金：湖南省重点研发计划项目资助(2018GK2031)。

摘　　要：电动汽车负荷的投切易造成充电站直流微网(Direct Current Microgrid,DC-MG)母线电压振荡甚至失稳。为平抑电压波动,通过分析系统惯量来源提出一种可改善系统阻尼特性和惯性效应的虚拟直流电机控制策略。建立该控制策略下Boost电路的小信号模型,推导出直流电压与输出电流之间的小信号传递函数,分析充电站受到扰动时母线电压的动态特性。利用二阶简化模型的零极点分布分析控制参数对动态响应过程的影响,用于指导控制参数的选取。仿真结果验证了所提控制策略的有效性和可靠性。In charging station,the switching of the electric vehicle may cause DC-MG bus voltage oscillation or even instability.The source of inertia is analyzed in this paper,and a virtual DC generator control that can improve the system damping characteristics and inertia effect is proposed to smooth the voltage fluctuation.The small signal model of the Boost circuit under this control is built.The small signal transfer function between the DC voltage and the output current is derived,and the dynamic characteristics of bus voltage are analyzed when the charging station is disturbed.The zero-pole distribution of the second-order simplified model is used to analyze the influence of the control parameters on the dynamic response,which is used to guide the selection of control parameters.Finally,simulation results verify the validity and reliability of the proposed control method.

关 键 词：充电站直流微网 虚拟直流电机控制 小信号模型 功率波动 直流电压振荡 

分 类 号：TM33[电气工程—电机]