%0 Journal Article
%T 负载均流的自适应虚拟阻抗下垂控制方法<br>Adaptive Virtual Impedance Droop Control Method in Load Sharing
%A 王天宏
%A 李奇
%A 陈维荣&lt
%A br&gt
%A WANG Tianhong
%A LI Qi
%A CHENG Weirong
%J 西南交通大学学报
%D 2017
%R 10.3969/j.issn.0258-2724.2017.05.025
%X 为实现直流外电网系统的负载均流，提高系统稳定性，在考虑线路阻抗的前提下，提出一种基于自适应虚拟阻抗的下垂控制方法.该方法根据输出下垂特性和虚拟阻抗原理，将负载电压、电流等代入虚拟阻抗算法，对所得虚拟阻值进行适当修正，实现了虚拟阻抗的自适应修正，能够有效改善负载均流效果.在搭建的实验平台上与传统下垂控制、传统虚拟阻抗下垂控制进行实验测试与对比，结果表明：传统虚拟阻抗下垂控制方式和自适应虚拟阻抗下垂控制方式均能将负载电流差异抑制在0.04 A内，各并联单元输出电流差异小；自适应虚拟阻抗下垂控制方式的负载调整率为0.1%，具有更低的负载调整率；综合考虑输出电流差异、负载调整率、母线电压等因素，自适应虚拟阻抗下垂控制方式具有良好的负载均流优越性和系统稳定性.<br>：An adaptive virtual impedance droop control method considering line impedance is proposed to achieve load sharing of a DC grid system and improve system stability. Based on the output droop characteristics and the principle of virtual impedance, the load voltage and current are taken into consideration in the virtual impedance algorithm. Then, the virtual resistance obtained is modified to realize adaptive correction, which effectively improves the load sharing performance. Finally, experimental measurement and comparison with traditional droop control and traditional virtual impedance droop control are carried out on the experimental platform. The results indicate that the traditional virtual impedance droop control mode and adaptive virtual impedance droop control mode can maintain the load current difference under 0.04 A. Further, the parallel output current difference is small, and the load regulation rate of the adaptive virtual impedance droop control method is 0.1%, which is lower than those of the other two control methods. Given factors such as output current difference, load regulation rate, and bus voltage, the adaptive virtual impedance droop control method has load sharing superiority and system stability
%K 直流微电网
%K 变换器并联运行
%K 负载均流
%K 下垂控制
%K 自适应虚拟阻抗
%K &lt
%K br&gt
%K direct current microgrid
%K converter parallel operation
%K load sharing
%K droop control
%K adaptive virtual impedance
%U http://manu19.magtech.com.cn/Jweb_xnjd/CN/abstract/abstract12498.shtml