基于虚拟阻抗的不间断电源并联系统均流控制-中国电机工程学报.PDF

第29 卷 第24 期 中 国 电 机 工 程 学 报 Vol.29 No.24 Aug. 25, 2009 32 2009 年8 月25 日 Proceedings of the CSEE ©2009 Chin.Soc.for Elec.Eng. 0258-8013 (2009) 24-0032-08 TN 86 TM 464 A 470 40 文章编号： 中图分类号： ； 文献标志码： 学科分类号： ⋅ 基于虚拟阻抗的不间断电源并联系统均流控制 于玮，徐德鸿 (浙江大学电气工程学院，浙江省 杭州市 310027) Control Scheme of Paralleled UPS System Based on Output Virtual Resistance YU Wei, XU De-hong (College of Electrical Engineering, Zhejiang University, Hangzhou 310027, Zhejiang Province, China) ABSTRACT: Because of the parameter differences among 流控制方法可大大提高系统的均流特性和稳定性。 units as well as the connection conductor impedances, the 关键词：虚拟电阻；有功功率和无功功率；均流控制；不间 equivalent impedance of each UPS (uninterrupeted power 断电源 system) inverter is different. In paralleled UPS system the DC bus voltage, IGBT conductor voltage and dead time of each 0 引言 UPS inverter also may be different. This difference can cause 随着用户对电源可靠性以及容量要求的不断 circulation current and decrease the load-sharing quality of 提高，UPS 的并联运行是一个很好的选择。采用冗 paralleled UPS system. In order to solve the problem, besides 余并机技术，即将UPS逆变器的输出端直接连接同 the double loop controller of output voltage and inductor 时给负载供电，可以提高UPS 的容量和系统的可靠 current, the output filter inductor current was being used to simulate a virtual resistance. The virtual resistance was added 性。UPS并联运行的关键在于负载电流的分配，近 to decrease the influence of DC bus voltage and IGBT 年来有很多学者对UPS逆变器并联控制方式进行研 conductor voltage difference