Impact of Common Mode Signal Injection on the Leakage Current of a Grid-connected Transformerless Pv Inverter

Julian C. Giacomini; Leandro Michels; Humberto Pinheiro; Cassiano Rech

doi:10.18618/REP.2016.4.2633

Authors

Julian C. Giacomini Federal University of Santa Maria, Power Electronics and Control Research Group, Santa Maria – RS, Brazil
Leandro Michels Federal University of Santa Maria, Power Electronics and Control Research Group, Santa Maria – RS, Brazil
Humberto Pinheiro Federal University of Santa Maria, Power Electronics and Control Research Group, Santa Maria – RS, Brazil
Cassiano Rech Federal University of Santa Maria, Power Electronics and Control Research Group, Santa Maria – RS, Brazil

DOI:

https://doi.org/10.18618/REP.2016.4.2633

Keywords:

Geometric approach, Leakage Current, Transformerless PV Inverter

Abstract

Leakage current is one of the most relevant problems in grid-connected transformerless photovoltaic (PV) inverters due to parasitic capacitance of the PV modules. This problem is directly related to the common mode voltage generated by inverter modulation. Therefore, this paper presents an analysis of the impact of the common mode signal usually injected in carrier based modulation approaches, aiming the reduction of the leakage current in three-phase grid-connected transformerless PV inverter. The resulting leakage current is analyzed for an inverter topology with a modified LCL filter, which is utilized to attenuate the high frequency components of the voltage on the PV parasitic capacitance. Experimental results are given to evaluate the performance of a 10 kW transformerless PV inverter.

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Author Biographies

Julian C. Giacomini, Federal University of Santa Maria, Power Electronics and Control Research Group, Santa Maria – RS, Brazil

was born in Redentora, Brazil, in 1989. He received the B. S. degree in electrical engineering in 2013 from the Regional University of Northwestern Rio Grande do Sul, Ijuí, Brazil, and the M.S. degree in electrical engineering from the Federal University of Santa Maria, Santa Maria, Brazil, in 2015. Currently, he is working toward the Ph.D. degree in electrical engineering in Federal University of Santa Maria. His areas of interest are: photovoltaic systems, control in power electronics and multilevel converters.

Leandro Michels, Federal University of Santa Maria, Power Electronics and Control Research Group, Santa Maria – RS, Brazil

was born in Não-Me-Toque, Brazil, in 1979. He received the B.S and Ph.D. degrees from the Federal University of Santa Maria, Santa Maria, Brazil, in 2002 and 2006, respectively, both in electrical engineering. Since 2009 he has been with the Power Electronics and Control Research Group (GEPOC) at Federal University of Santa Maria, where he is currently an Adjunct Professor. His current research interests include modeling and control of power converters, applied digital control and renewable energy applications.

Humberto Pinheiro, Federal University of Santa Maria, Power Electronics and Control Research Group, Santa Maria – RS, Brazil

was born in Santa Maria, Rio Grande do Sul, Brazil, in 1960. He received the B.S. degree from the Federal University of Santa Maria, Santa Maria, in 1983, the M.S. degree from the Federal University of Santa Catarina, Florianópolis, Brazil, in 1987, and the Ph.D. degree from Concordia University, Montreal, QC, Canada, in 1999. From 1987 to 1990, he was a Research Engineer with a Brazilian UPS company and then joined the Pontifícia Universidade Católica do Rio Grande do Sul, Porto Alegre, Brazil, where he lectured on power electronics. Since 1991, he has been with the UFSM. His current research interests include grid connected three-phase converters, wind energy conversion systems, and control applied to power electronics systems. Dr. Pinheiro is a member of SOBRAEP, IEEE Power Electronics Society and IEEE Industrial Electronics Society.

Cassiano Rech, Federal University of Santa Maria, Power Electronics and Control Research Group, Santa Maria – RS, Brazil

was born in Carazinho, RS, Brazil, in 1977. He received the B.S., M.S. and Ph.D. degrees in electrical engineering from the Federal University of Santa Maria (UFSM), Santa Maria, Brazil, in 1999, 2001, and 2005, respectively. From 2005 to 2007, he was with the Regional University of Northwestern Rio Grande do Sul. From 2008 to 2009, he was with Santa Catarina State University, Florianópolis, Brazil. Since 2009, he has been with the UFSM, where he is currently a Professor. His research interests include multilevel converters and modeling, and digital control techniques of static converters. Dr. Rech is a member of Brazilian Power Electronics Society (SOBRAEP) and several IEEE Societies.

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