A Transformerless Common-Ground Two-Switch Single-Phase Inverter for Battery Energy Storage System Applications

Gabriel de O. Assunção; Ivo Barbi

doi:10.18618/REP.2021.1.0022

Authors

Gabriel de O. Assunção Federal University of Santa Catarina, Department of Electrical Engineering, Florianópolis - SC, Brazil
Ivo Barbi Federal University of Santa Catarina, Department of Automation and Systems, Florianópolis - SC, Brazil

DOI:

https://doi.org/10.18618/REP.2021.1.0022

Keywords:

Battery energy storage system, Common-ground inverter, Leakage Current, Parasitic capacitance, Transformerless inverter

Abstract

This paper proposes a transformerless common-ground single-phase inverter for battery energy storage system (BESS) applications. With regard to conventional converters operating as a voltage source inverter (VSI), the proposed converter offers the advantage of a common connection between the battery bank negative terminal and the ground. Hence, the common-mode voltage becomes continuous while common-mode currents flowing through parasitic capacitances located between the battery bank and the grounded metallic frame are eliminated, allowing operation without a transformer. This new topology has only two power semiconductors, two inductors and one capacitor, without the need for a filter on the AC grid side. The converter operation is described and the relevant equations for sizing are presented along with the main characteristics. A 1 kW non-optimized prototype was dimensioned, built and tested to validate in practice the theoretical analysis, and a maximum efficiency of 95.25% was obtained. Due to the simplicity, low number of active components, no clamping circuit requirement and the common-ground, this topology is a very interesting option for the above-mentioned application.

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Author Biographies

Gabriel de O. Assunção , Federal University of Santa Catarina, Department of Electrical Engineering, Florianópolis - SC, Brazil

was born in Londrina, Brazil, in 1988. He received his B.S. degree in electronic engineering and M.S. degree in electrical engineering from the Federal University of Technology – Paraná (UTFPR), Ponta Grossa, Brazil, in 2013 and 2016, respectively. He is currently working toward a Ph.D. degree in electrical engineering at Eletrôn. Potên., Florianópolis, v. 27, n. 1, p. 15-25, jan./mar. 2022 25 the Federal University of Santa Catarina (UFSC), Florianopolis, Brazil. His research interests include power electronics, rectifiers, inverters, power converters for storage systems and renewable energy sources.

Ivo Barbi , Federal University of Santa Catarina, Department of Automation and Systems, Florianópolis - SC, Brazil

was born in Gaspar, Santa Catarina, Brazil. 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 in electrical engineering from the Institut National Polytechnique de Toulouse, Toulouse, France, in 1979. He founded the Brazilian Power Electronics Society, the Brazilian Power Electronics Conference, in 1990, and the Brazilian Institute of Power Electronics and Renewable Energy, in 2016. He is currently a Researcher with the Solar Energy Research Center, Florianópolis, SC, Brazil, and a Professor Emeritus of electrical engineering with UFSC. Dr. Barbi was a recipient of the 2020 IEEE William E. Newell Power Electronics Award. He was an Associate Editor for the IEEE TRANSACTIONS ON INDUSTRIAL ELECTRONICS and the IEEE TRANSACTIONS ON POWER ELECTRONICS for several years.

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