Design of a 660 V / 15 kVA single-phase UPS based on series connection of low-output-voltage modular UPS

Telles B. Lazzarin; Ivo Barbi

doi:10.18618/REP.2012.3.584591

Authors

Telles B. Lazzarin Federal Institute of Santa Catarina (IFSC), Florianópolis - SC, Brazil
Ivo Barbi Federal University of Santa Catarina (UFSC), Florianópolis - SC, Brazil

DOI:

https://doi.org/10.18618/REP.2012.3.584591

Keywords:

High Output Voltage, Series Connection, UPS

Abstract

Critical loads are usually provided by sources of uninterruptible power supply (UPS). Such devices have output voltages equivalent to levels found in commercial power grids. However, when high output voltages are required there is still no standard solution to achieve the desired level of voltage. This paper proposes the development of a high-output-voltage single-phase UPS based on the series connection of several low-output-voltage modular UPSs. The main idea is to obtain a commercial UPS in one standard module which can connect several modules in series until reaching the required output voltage. This solution allows high-voltage to be obtained employing only available modules and being of low cost it is suitable for industrial application. In this context, this paper introduces some principles regarding the series connection of UPS, which translates into the serial connection of voltage source inverters (VSIs). Furthermore, the study provides the experimental verification of the proposed system through the development of a prototype of 660V and 15kVA, obtained from the connection of three single-phase modules of 220V and 5kVA.

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Author Biographies

Telles B. Lazzarin, Federal Institute of Santa Catarina (IFSC), Florianópolis - SC, Brazil

was born in Criciúma, Santa Catarina, Brazil, in 1979. He received the B.S. degree in electrical engineering and the M.S. and Ph.D. degrees from the Federal University of Santa Catarina (UFSC), Florianópolis, Brazil, in 2004, 2006, and 2010, respectively. He is currently a Professor in Federal Institute of Santa Catarina (IFSC). He is a member of the Brazilian Power Electronic (SOBRAEP) and a member of the IEEE Society.

Ivo Barbi, Federal University of Santa Catarina (UFSC), Florianópolis - SC, Brazil

was born in Gaspar, Santa Catarina, Brazil, in 1949. He received the B.S. and M.S. degrees in electrical engineering from the Federal University of Santa Catarina (UFSC), Florianópolis, Brazil, in 1973 and 1976, respectively, and the Dr.Ing. degree from the Institut National Polytechnique of Toulouse, Toulouse, France, in 1979. He founded the Brazilian Power Electronics Society (SOBRAEP) and the Institute of Power Electronics (INEP), UFSC. He is currently a Professor with INEP and the Leader of the power electronics program of UFSC.

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