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Operating region extension for multilevel converters in HVDC applications by optimisation methods
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.ORCID iD: 0000-0002-8565-4753
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
2012 (English)In: IET Conference Publications: 10th IET International Conference on AC and DC Power Transmission (ACDC 2012) Volume 2012, Issue 610 CP, 2012, 2012Conference paper, Published paper (Refereed)
Abstract [en]

Modular multilevel converters, based on cascading of halfbridge converter cells, can combine low switching frequency with low harmonic interference. They can be designed for high operating voltages without direct series connection of semiconductor elements. This has led to a rapid adoption within high-power applications such as high voltage direct current transmission. However, the overall hardware expenditure is generally greater than for conventional converters. Improving the operating range in the PQ-plane of the converter is thus desirable. In this work it is shown that optimisation of the internal variables of the converter can increase the power handling capability significantly for a given set of rating constraints. In this process optimal values for the circulating currents, the zero-sequence ac-side voltages and the average stored energy are sought. Also, a control algorithm is demonstrated by which the converter can be operated in the optimised operating point. Simulation results clearly indicate the feasibility of the proposed methodology.

Place, publisher, year, edition, pages
2012.
Series
IET Conference Publications, 2012
Keyword [en]
Cascaded Converter, Modular Multilevel Converter, Optimisation
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
SRA - Energy
Identifiers
URN: urn:nbn:se:kth:diva-107720DOI: 10.1049/cp.2012.1987Scopus ID: 2-s2.0-84879682770ISBN: 978-184919700-7 (print)OAI: oai:DiVA.org:kth-107720DiVA: diva2:577753
Conference
10th IET International Conference on AC and DC Power Transmission, ACDC 2012; Birmingham; United Kingdom; 4 December 2012 through 5 December 2012
Funder
StandUp
Note

QC 20130111

Available from: 2012-12-17 Created: 2012-12-17 Last updated: 2013-10-08Bibliographically approved

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Norrga, Staffan

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
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Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
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  • Other locale
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Output format
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