Thermal Impact Analysis of Circulating Current in High Power Modular Online Uninterruptible Power Supplies Application

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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. 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.
Original languageEnglish
Title of host publicationProceedings of the 17th Conference on Power Electronics and Applications, EPE'15-ECCE Europe
Number of pages10
PublisherIEEE Press
Publication date2015
Pages1-10
DOIs
Publication statusPublished - 2015
Event17th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2015 - Centre International de Conférence Genève (CICG), 17 rue Varembé CH . 1211 Genève 20, Geneva, Switzerland
Duration: 8 Sep 201510 Sep 2015

Conference

Conference17th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2015
LocationCentre International de Conférence Genève (CICG), 17 rue Varembé CH . 1211 Genève 20
CountrySwitzerland
CityGeneva
Period08/09/201510/09/2015

Keywords

  • Modular UPS system
  • Thermal analysis
  • Zero sequence circulating current

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