A Generalized Scalar Pulse-width Modulation for Nine-switch Inverters

Fabrício Bradaschia; Leonardo R. Limongi; Felipe C. de Andrade; Gustavo M. S. Azevedo

doi:10.18618/REP.2014.2.182193

Authors

Fabrício Bradaschia Federal University of Pernambuco, Department of Electrical Engineering
Leonardo R. Limongi Federal University of Pernambuco, Department of Electrical Engineering
Felipe C. de Andrade Federal University of Pernambuco, Department of Electrical Engineering
Gustavo M. S. Azevedo Federal University of Pernambuco, Department of Electrical Engineering

DOI:

https://doi.org/10.18618/REP.2014.2.182193

Keywords:

Nine-switch inverter, Pulse Width Modulation, Switching Losses

Abstract

The nine-switch inverter has been proposed recently and, since then, a large number of applications has been investigated, specially as a substitute to the dualbridge (back-to-back) converter. The main advantage of the nine-switch inverter is its lesser number of switches (nine instead of twelve of the back-to-back converter), which has as a tradeoff some restrictions in the total attainable amplitude at its outputs, dependent on the phase shift between its two terminal sets. Thus, when migrating modulation techniques from the conventional three-phase inverter to the nine-switch inverter, more concerns have to be addressed. This paper deals with pulse-width modulation strategies that can be easily implemented by using the concept of generalized scalar modulation in this type of inverter. In fact, such concept leads to a systematic and straight approach to the generation of any continuous or discontinuous pulsewidth modulation strategy. Aiming the reduction of switching losses, the generalized modulation is applied with a specific distribution parameter that reduces the number of switchings and the power losses of the three-phase nine-switch inverter. Experimental results confirm the validity of the proposed method.

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Author Biographies

Fabrício Bradaschia, Federal University of Pernambuco, Department of Electrical Engineering

was born in São Paulo, Brazil, in 1983. He received the B.Sc., M.Sc. and Ph.D. degrees in electrical engineering from the Federal University of Pernambuco, Recife, Brazil, in 2006, 2008 and 2012, respectively. From 2008 to 2009, he worked as a visiting scholar at the University of Alcalá, Madrid, Spain. Since 2013, he is working as an associate professor in the Department of Electrical Engineering at the Federal University of Pernambuco. His research interests are application of power electronics in renewable energy systems and power quality, including pulse-width modulation, converter topologies and grid synchronization methods.

Leonardo R. Limongi, Federal University of Pernambuco, Department of Electrical Engineering

was born in Recife, Brazil, degree in electrical in 1978. He received the M.Sc. engineering from the Federal University of Pernambuco, Recife, Brazil, in 2006, and the Ph.D. degree from the Politecnico di Torino, Turin, Italy, in 2009. Since 2010, he has been at the Department of Electrical Engineering, Federal University of Pernambuco, where he is currently a Professor of Electrical Engineering. He is the author of more than 30 papers published in international conference proceedings and technical journals. His research interests include the fields of power electronics dedicated to power conditioning systems and distributed generation.

Felipe C. de Andrade, Federal University of Pernambuco, Department of Electrical Engineering

was born in Recife, Brazil, in 1989. He received the B.S. degree in electrical engineering from the University of Pernambuco, Recife, Brazil, in 2013. He is currently working toward the M.Sc. degree in electrical engineering from the Federal University of Pernambuco, Recife, Brazil. His research interests are renewable energy systems and power quality.

Gustavo M. S. Azevedo, Federal University of Pernambuco, Department of Electrical Engineering

was born in Belo Jardim, Brazil, in 1981. He received the B.Sc., M.Sc. and Ph.D. degrees in electrical engineering from the Federal University of Pernambuco in 2005, 2007 and 2011, respectively. He worked as a visiting scholar at the Polytechnical University of Catalunya, Barcelona, Spain, from 2008 to 2009. Since 2014, he has been in the Department of Electrical Engineering at the Federal University of Pernambuco, where he is currently a Professor of Electrical Engineering. His research interests are renewable energy systems and microgrids.

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