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A new modulation method for the modular multilevel converter allowing fundamental switching frequency
KTH, School of Electrical Engineering (EES). (Elektriska maskiner och effektelektronik)
KTH, School of Electrical Engineering (EES). (Elektriska maskiner och effektelektronik)
KTH, School of Electrical Engineering (EES). ABB, Sweden. (Elektriska maskiner och effektelektronik)ORCID iD: 0000-0002-8565-4753
KTH, School of Electrical Engineering (EES). (Elektriska maskiner och effektelektronik)ORCID iD: 0000-0002-1755-1365
2011 (English)In: IEEE 8th International Conference on Power Electronics and ECCE Asia (ICPE & ECCE), 2011: 'Green World with Power Electronics' / [ed] IEEE, IEEE , 2011, 991-998 p.Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents a new modulation method for the modular multilevel converter. The proposed method is based on a fixed pulse pattern where harmonic elimination methods can be applied. Modulation methods with harmonic elimination based on calculated pulse patterns have been presented for other multilevel topologies. However, similar modulation schemes have not yet been presented for the modular multilevel topology. In the proposed modulation method, the pulse pattern is chosen in such a way that the stored energy in each submodule remains stable. It is shown that this can be done at the fundamental switching frequency without measuring the capacitor voltages or using any other form of feedback control. Such a modulation scheme has not been presented before. The theoretical results are verified by both simulations and experimental results. The simulation results show successful operation at the fundamental switching frequency with a larger number of submodules. When a smaller number of submodules are used, harmonic elimination methods may be applied. This is verified experimentally on a converter with eight submodules per phase leg. The experimental results verify that stable operation can be maintained at the fundamental switching frequency while successfully eliminating the fifth harmonic in the ac-side voltage.

Place, publisher, year, edition, pages
IEEE , 2011. 991-998 p.
Keyword [en]
Harmonic analysis, Power electronics, Switching frequency, Topology
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
SRA - Energy
Identifiers
URN: urn:nbn:se:kth:diva-40604DOI: 10.1109/ICPE.2011.5944672Scopus ID: 2-s2.0-80052087118ISBN: 978-161284956-0 (print)OAI: oai:DiVA.org:kth-40604DiVA: diva2:441655
Conference
ICPE 2011
Funder
StandUp
Note

QC 20110930

Available from: 2011-09-17 Created: 2011-09-17 Last updated: 2016-04-27Bibliographically approved

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Norrga, StaffanNee, Hans-Peter

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