Access Restriction

Author Chi Zhang ♦ Guerrero, J.M. ♦ Vasquez, J.C.
Source IEEE Xplore Digital Library
Content type Text
Publisher Institute of Electrical and Electronics Engineers, Inc. (IEEE)
File Format PDF
Copyright Year ©2015
Language English
Subject Domain (in DDC) Natural sciences & mathematics ♦ Physics ♦ Electricity & electronics ♦ Technology ♦ Engineering & allied operations ♦ Applied physics
Subject Keyword Modular UPS system ♦ Reactive power ♦ zero sequence circulating current ♦ Heating ♦ Pulse width modulation ♦ Voltage control ♦ Junctions ♦ Uninterruptible power systems ♦ thermal analysis
Abstract In a modular uninterruptible power supplies (UPS), each DC/AC module was designed to work in a circular way considering the reliability and power stress issues of the whole system. Thus unsynchronized PWMs will occur if any of the DC/AC modules is plugged in or out of the system at any time. On the other hand, modular difference is another issue that will bring such kind of circulating current. In order to reduce system size and cost, each module shares the same DC and AC bus without any isolation or passive elements in the system. Consequently, potential zero-sequence current is possible to occur and should be paid specific attention. In this paper, a four-module online UPS system is designed. And thermal and loss distribution condition are investigated under different circulating current condition with conventional three phase H-bridge topology.
Description Author affiliation: Aalborg Univ., Aalborg, Denmark (Chi Zhang; Guerrero, J.M.; Vasquez, J.C.)
Educational Role Student ♦ Teacher
Age Range above 22 year
Educational Use Research ♦ Reading
Education Level UG and PG
Learning Resource Type Article
Publisher Date 2015-09-08
Publisher Place Switzerland
Rights Holder EPE Association and IEEE
e-ISBN 9789075815221
Size (in Bytes) 1.14 MB
Page Count 10
Starting Page 1
Ending Page 10

Source: IEEE Xplore Digital Library