基于虚拟阻抗逆变器无互连线并联均流控制  

No-interconnection Current-sharing Control for Parallel Inverter Based on Virtual Impedance

作　　者：张铭隆 龙江涛[1] 钱希森[1] 张颖超[1] 

机构地区：[1]重庆通信学院,重庆400035

出　　处：《电源世界》2015年第3期26-30,共5页The World of Power Supply

摘　　要：在逆变器并联系统中,由于传统下垂控制对逆变器输出阻抗性质极为敏感,难以实现真正的均流。本文在分析下垂控制原理基础之上,利用系统等效传递函数bode图,研究了逆变器参数及线路连接阻抗对输出阻抗影响;通过在控制环节加入虚拟阻抗以改善输出阻抗性质,实现了功率均分,减小了模块间环流;构建了两台逆变器仿真模型,验证了该方案的有效性。In the system of parallel inverter, it is difficult to achieve current sharing that the conventional droop control is more sensitive to the output impedance of inverter. In this paper, through the bode diagram of equivalent transfer function of the inverter system discussthat the impedance of line and the parameters of control affect to the output impedance after understanding the droop control method. Power sharing and the circulating current reducing can be achieved by adding virtual impedance in control loopsto improve the nature of oulput impedance. Constructed two simulate models ofinverter to verify the effectiveness of the program.

关 键 词：逆变器 并联 虚拟阻抗 均流 

分 类 号：TM464[电气工程—电器]