Peak-to-Peak Output Current Ripple Analysis in Multiphase and Multilevel Inverters

137 Pages·2014·15.959 MB·English

by  Jelena Loncarski (auth.)

Springer Theses
Recognizing Outstanding Ph.D. Research
Jelena Loncarski

Peak-to-Peak
Output Current
Ripple Analysis
in Multiphase
and Multilevel
Inverters
Springer Theses
Recognizing Outstanding Ph.D. Research
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Jelena Loncarski
Peak-to-Peak Output
Current Ripple Analysis
in Multiphase and Multilevel
Inverters
Doctoral Thesis accepted by
University of Bologna, Bologna, Italy
1 3
Author Supervisor
Dr. Jelena Loncarski, Ph.D. Prof. Gabriele Grandi, Ph.D.
Department of Electrical, Electronic Department of Electrical, Electronic
and Information Engineering, and Information Engineering,
“Guglielmo Marconi”—DEI “Guglielmo Marconi”—DEI
Alma Mater Studiorum—University Alma Mater Studiorum—University
of Bologna of Bologna
Viale Risorgimento, 2 Viale Risorgimento, 2
40136 Bologna 40136 Bologna
Italy Italy
email: [email protected]
ISSN 2190-5053 ISSN 2190-5061 (electronic)
ISBN 978-3-319-07250-0 ISBN 978-3-319-07251-7 (eBook)
DOI 10.1007/978-3-319-07251-7
Springer Cham Heidelberg New York Dordrecht London
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Parts of this thesis have been published in the following documents:
Journal
• G. Grandi, J. Loncarski, “Analysis of peak-to-peak current ripple amplitude in
seven-phase PWM voltage source inverters”, Energies, 6, ISSN 1996–1073,
2013. DOI: 10.3390/en6094429
• G. Grandi, J. Loncarski, “Simpliefi d implementation of optimised carrier-based
PWM in three-level inverters,” IET Electronics Letters, vol. 50, no. 8, pp. 631–
633, April 2014. DOI: 10.1049/el.2014.0043
International Conferences
• G. Grandi, J. Loncarski, “Evaluation of current ripple amplitude in three-
phase PWM voltage source inverters,” In Proc. of 8th IEEE Intl. Conference
on Compatibility and Power Electronics, CPE, Ljubljana SLO, 5–7 June 2013.
DOI: 10.1109/CPE.2013.6601146
• G. Grandi, J. Loncarski, “Evaluation of current ripple amplitude in five-phase
PWM voltage source inverters,” Proc. of IEEE Conference on ICT, Power engi-
neering, and Signal processing (EUROCON), Zagreb CRO, 1–4 July 2013.
DOI: 10.1109/EUROCON.2013.6625114
• J. Loncarski, O. Dordevic, G. Grandi, “Experimental verification of current rip-
ple amplitude in five-phase PWM VSIs,” In Proc. of 39th Annual Conference of
the IEEE Industrial Electronics Society (IECON), Wien AUT, 10–13 Nov. 2013.
DOI: 10.1109/IECON.2013.6699977
• G. Grandi, J. Loncarski, C. Rossi, “Comparison of peak-to-peak current ripple
amplitude in multiphase PWM voltage source inverters,” In Proc. of 15th IEEE
Conf. on Power Electronics and Applications (EPE’13 ECCE Europe), Lille FR,
3–5 Sept. 2013. DOI: 10.1109/EPE.2013.6634719
• G. Grandi, J. Loncarski, R. Seebacher, “Effects of current ripple on dead-time analy-
sis of three-phase inverters,” In Proc. of IEEE Energy Conference (ENERGYCON),
Florence IT, 9–12 Sept. 2012, pp. 207–212. DOI: 10.1109/EnergyCon.2012.6347753
Supervisor’s Foreword
It is a great pleasure to introduce Dr. Jelena Loncarski’s Ph.D. thesis work,
accepted for publication within Springer Theses and awarded with a prize for out-
standing original work in 2014. Dr. Loncarski joined my research group in January
2011, after finishing the Master program at Faculty of Electrical Engineering,
University of Belgrade, and some work experience in Serbian engineering
enterprises. She started her Doctoral study in Electrical Engineering (Power
Electronics) under my supervision at the Department of Electrical, Electronic, and
Information Engineering at University of Bologna (Italy) with a 3-year Erasmus
scholarship and completed it with an oral defense in March 2014. During the
3-years she was a fellow of the Institute of Advanced Studies (ISA—UniBO).
In 2012, she was awarded with Marco Polo scholarship for a 3-month exchange
period with the Technical University of Graz, Austria.
Dr. Loncarski has started her Ph.D. research period with a detailed investigation
of the inverter dead-time. In particular, the effect of the dead-time on the inverter
output voltage was introduced for multiphase inverters (three-, five-, and seven-
phases), in the case of sinusoidal output currents. Further on, the analysis has been
extended to the realistic case of high ripple currents. Her aim was to determine the
zero-crossing interval of the current, and it has been verified that it is proportional
to the peak-to-peak amplitude of the current ripple. Since the existing literature
on the peak-to-peak current ripple is poor, she has started to develop an accurate
method to account for it.
In this Ph.D. thesis, Jelena introduces an original and effective method for the
analysis of the peak-to-peak output current ripple amplitude in three-phase two-
level inverters first. Then, the analysis is extended to both multiphase and multi-
level inverters, with particular emphasis on five and seven phases, and three levels,
making possible a general comparison among different number of phases and out-
put voltage levels. Various peak-to-peak current ripple diagrams are presented and
discussed. In particular, an original and effective map of the ripple amplitude is
introduced for all the considered cases. Simple and straight expressions to account
for the maximum of the output current ripple have been defined. The results are
original and well supported by numerical simulations and experimental tests.
Interesting application examples are given in the last section of the Ph.D. thesis.
vii
viii Supervisor’s Foreword
Dr. Loncarski’s thesis includes significant original scientific contributions in the
field of power electronics, proved by publications in scientific journals and inter -
national conferences.
The knowledge of peak-to-peak current ripple distribution has the potential
for future improvements in several fields. Possible applications are in all power
electronic systems with current ripple restrictions. Furthermore, the knowledge of
the analytical expression of peak-to-peak current ripple amplitude allows switch-
ing frequency optimization in PWM inverters and opens the possibility to compare
the behavior with hysteresis current controllers in both multiphase and multilevel
inverters.
Bologna, March 2014 Prof. Gabriele Grandi
Acknowledgments
It is my honor to express sincere gratitude to all the people I came across during
my research period at University of Bologna, and if perhaps they have not been
listed here, were a great impact on me and my work.
First of all, I would like to thank my family in Serbia, for all the support and
encouragement they provided to me during all the years of my growth. Without
their support I would not have been able to complete my Ph.D. research work suc-
cessfully. Furthermore, I would like to thank all my friends in Serbia for all the
care and support they provided me, regardless of the distance and in spite of their
own problems due to the decades of the difficult situation in Serbia.
My deepest gratitude goes to my advisor, Prof. Gabriele Grandi, who has
unselfishly helped me with all the issues we have come across during my Ph.D.
research activity. I was very lucky to have had the opportunity to work with such
an extraordinary person as him. Among the many difficulties we had to solve,
most appreciable was his help from the academic point of view. His professional
supervision and immense technical knowledge have helped my research to steer in
the right direction and framed this thesis. His support and guidance have always
given me the strength to continue forward. All the merits for the results obtained
during my research period should be addressed to him. I am looking forward to
extend our collaboration also for the future research work.
I am deeply thankful to my dear friend, Prof. Eduardo Alvarez–Miranda, with
whom I passed the most joyful moments and shared the most difficult ones during
the Ph.D. period. Although we originally come from different parts of the world,
for us it has been easy to get close and find a common point. I hope to keep our
friendship, regardless of the possible future distance.
Two important persons from the Department of Electrical Engineering at
UniBO have encouraged my work. First is our Ph.D. coordinator, Prof. Domenico
Casadei, whom I thank for the theoretical and practical concepts he has provided
to all of us. Second is Prof. Claudio Rossi, who has always given practical knowl-
edge and advised me from the point of view of applications.
I would like to thank also the group of Prof. Emil Levi, Liverpool John Moores
University, in particular Dr. Obrad Dordevic, for the support given to obtain the
experimental results, their devoted cooperation, and useful advice.
ix
x Acknowledgments
This research project has been supported by Erasmus Mundus (JoinEU-SEE
project). The help of our Erasmus coordinator Livia Mercatelli is gratefully
acknowledged.
I wish to express my sincere appreciation for the support I have received during
my Ph.D. course from the Institute of the Advanced Studies (ISA), where I have
been a Fellow during 3 years. A very special person from ISA, coordinator Barbara
Cimatti, has selefl ssly devoted herself to helping the fellows of the institute. Their
hospitality meant a lot to me, and it is great to have such an institution as an Alma
Mater.
It has been a privilege to collaborate with the Department for Electrical
Engineering, University of Bologna, and I would like to thank all the colleagues
for the work facilities they provided me and their willingness to collaborate.
Bologna, February 2014 Jelena Loncarski