Space Vector Modulation Techniques for Common-Mode Voltage Reduction in Three-Phase Transformerless Split-Source Inverters

Diego Brum Chaves; Felipe Bovolini Grigoletto

doi:10.18618/REP.2020.1.0065

Authors

Diego Brum Chaves Federal University of Pampa, Laboratory of Energy Processing and Control, Alegrete - RS, Brazil
Felipe Bovolini Grigoletto Federal University of Pampa, Laboratory of Energy Processing and Control, Alegrete - RS, Brazil

DOI:

https://doi.org/10.18618/REP.2020.1.0065

Keywords:

Common-Mode Voltage, Leakage Current, Space Vector Modulation, Split-Source Inverter

Abstract

Photovoltaic (PV) systems with low input voltage usually employ an input boost converter and an output inverter. Regarding to this issue, the split-source inverter (SSI) provides a single power conversion stage which aggregates boost capability with low switch count. On the other hand, conventional modulation strategies applied to the grid-connected SSI can result in large high-frequency common-mode voltage (CMV). Depending on the parasitic path, the CMV synthesized by the inverter can give rise to large leakage current which must be limited for security reasons. This paper proposes two space vector modulation (SVM) strategies to provide the reduction of high-frequency CMV in transformerles SSI. The first strategy is based on the selection of specific voltage vectors whereas the second strategy employs virtual vectors which correspond to the combination of existing voltage vectors. Furthermore, it is performed an analysis in terms of CMV, leakage current, total harmonic distortion of line-to-line voltages and the maximum achievable modulation index. In addition, a comparison with existing techniques is presented to demonstrate the features of the proposed strategies. Finally, simulations and hardware-in-the-loop results demonstrate the benefits of the proposed techniques.

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Author Biographies

Diego Brum Chaves, Federal University of Pampa, Laboratory of Energy Processing and Control, Alegrete - RS, Brazil

was born in Osorio, Brazil, in 1997. He received the B.Sc. degree in electrical engineering from the Federal University of Pampa, Brazil, in 2019. He is currently a master’s student at the Federal University of Santa Maria, Brazil. His areas of interest are power electronics and renewable energy conversion systems.

Felipe Bovolini Grigoletto, Federal University of Pampa, Laboratory of Energy Processing and Control, Alegrete - RS, Brazil

was born in Restinga SÃaca, Brazil, in 1985. He received his B.Sc., M.Sc., and D.Sc. degrees in electrical engineering from Federal University of Santa Maria (UFSM), Santa Maria, Brazil, in 2007, 2009 and 2013 respectively. He is currently a Professor with the Federal University of Pampa (UNIPAMPA), Alegrete, Brazil. His current research interests include renewable energy conversion systems, grid-connected converters and modulation strategies for multilevel converters. Dr. Grigoletto is currently a member of IEEE and SOBRAEP societies.

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