Proposal of Three-Phase High Frequency Transformer Isolation UPS Topologies

Carlos G. C. Branco; René P. Torrico-Bascopé; Cicero M. T. Cruz; Francisco K. A. Lima

doi:10.18618/REP.20114.285295

Authors

Carlos G. C. Branco Universidade Federal do Ceará Departamento de Engenharia Elétrica Campus do Pici, Bloco: 705, CEP: 60.455-760, Caixa Postal 6001, Fortaleza-CE-Brasil
René P. Torrico-Bascopé Universidade Federal do Ceará Departamento de Engenharia Elétrica Campus do Pici, Bloco: 705, CEP: 60.455-760, Caixa Postal 6001, Fortaleza-CE-Brasil
Cicero M. T. Cruz Universidade Federal do Ceará Departamento de Engenharia Elétrica Campus do Pici, Bloco: 705, CEP: 60.455-760, Caixa Postal 6001, Fortaleza-CE-Brasil
Francisco K. A. Lima Universidade Federal do Ceará Departamento de Engenharia Elétrica Campus do Pici, Bloco: 705, CEP: 60.455-760, Caixa Postal 6001, Fortaleza-CE-Brasil

DOI:

https://doi.org/10.18618/REP.20114.285295

Keywords:

High-frequency Transformer Isolation, Power Factor Correction - PFC, Three-phase Uninterruptible Power Supply

Abstract

A family of double conversion three-phase uninterruptible power system with power factor correction and high-frequency transformer (HFT) isolation topologies is presented in this work. This might be an alternative compared to large conventional UPS systems that are based in bulky transformers that operates in the grid frequency. These systems are suitable for operation with line-to-line input voltages equal to 220-V or 380-V. For both input voltages, the proposed converter has almost the same efficiency processing the same output power. The three-phase HFT UPS used for further analysis is composed by single-phase chopper modules, one three-phase boost module, and one three-phase inverter. The relevant features are soft commutation of the controlled switches in the chopper stage, simple control strategy that can be implemented with well-known integrated circuits (IC), and the use of few batteries in series due to the same reference of the step-up stages. Principle of operation of the chosen system for experimental validation, implemented control strategy and experimental results obtained for a 15kVA prototype are presented.

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Author Biographies

Carlos G. C. Branco, Universidade Federal do Ceará Departamento de Engenharia Elétrica Campus do Pici, Bloco: 705, CEP: 60.455-760, Caixa Postal 6001, Fortaleza-CE-Brasil

was born in Fortaleza, Ceará, Brazil, on July 11th, 1979. He received the B. Sc. And M. Sc degrees in Electrical Engineering from Federal University of Ceará, Brazil, in 2002 and 2005, respectively. Currently, he is working towards the Dr. Eng. degree in Electrical Engineering from Federal University of Ceará, Brazil. Since 2009, he has been with the Electrical Engineering Department, Federal University of Ceará (Brazil), where he is now Professor of Electrical Engineering. His research interests include uninterruptible power supply systems, power factor correction circuits, soft- switching techniques and converters for renewable energy sources. He is member of the Brazilian Society of Power Electronics (SOBRAEP) and the Institute of Electrical and Electronics Engineers (IEEE).

René P. Torrico-Bascopé, Universidade Federal do Ceará Departamento de Engenharia Elétrica Campus do Pici, Bloco: 705, CEP: 60.455-760, Caixa Postal 6001, Fortaleza-CE-Brasil

was born in Cochabamba, Bolivia, in 1967. He received the B. Eng. degree from San Simon University of Cochabamba, Bolivia, in 1992, and its M.Eng. and Dr.Eng. degrees from the Federal University of Santa Catarina, Florianopolis, Brazil, in 1994 and 2000, respectively. During 1995 and 1996, he was Research Engineer in the Power Electronics Institute of the Federal University of Santa Catarina. From March 2001 to May 2003, he has been an Assistant Professor at the Univali University of Itajai, Brazil. Currently, he is Associate Professor of the Department of Electrical Engineering of the Federal University of Ceará, Brazil. His main research interests include power supplies, power factor correction techniques, UPS systems, and alternative energy systems.

Cicero M. T. Cruz, Universidade Federal do Ceará Departamento de Engenharia Elétrica Campus do Pici, Bloco: 705, CEP: 60.455-760, Caixa Postal 6001, Fortaleza-CE-Brasil

was born in Crato-CE(Brazil). He received the B.Sc. in Electrical Engineering from the Federal University of Cearå in 1990. He received the MSc and Dr.Eng. degrees in Electrical Engineering from Federal University of Santa Catarina, Brazil, in 1993 and 2002, respectively. Since 1994, he has been with the Electrical Engineering Department, Federal University of Cearå (Brazil), where he is now Associate Professor of Electrical Engineering. His research interests include Power Electronics and its application to renewable energy. He is member of the Brazilian Society of Power Electronics (SOBRAEP).

Francisco K. A. Lima, Universidade Federal do Ceará Departamento de Engenharia Elétrica Campus do Pici, Bloco: 705, CEP: 60.455-760, Caixa Postal 6001, Fortaleza-CE-Brasil

was born in Fortaleza-CE (Brazil). He received the B.Sc. in Electrical Engineering from the Federal University of Ceará in 1998. He received the M. Sc. and Dr. Eng. degrees in Electrical Engineering from Federal University of Ceará, Brazil, and from Federal University of Rio de Janeiro, Brazil, in 2003 and 2009, respectively. Currently, he is with the Electrical Engineering Department, Federal University of Ceará (Brazil), where he is now Adjunct Professor of Electrical Engineering. His research interests include Power Electronics and its application to the power system and renewable energy systems. He is member of the Brazilian Society of Power Electronics (SOBRAEP).

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