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Continuous modeling of open-loop control based negative sequence current control of modular multilevel converters for HVDC transmission
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.ORCID iD: 0000-0002-1755-1365
2013 (English)In: Eur. Conf. Power Electron. Appl., EPE, 2013Conference paper, Published paper (Refereed)
Abstract [en]

Negative sequence currents are obtained during ac-side asymmetrical faults of converters in highvoltage direct current (HVDC) transmission systems. Consequently, second order harmonics in the dc-side voltage and current, unbalanced ac-side currents, and power oscillations can be observed. This paper presents a negative sequence current control (NSCC) scheme that eliminates second order harmonic ripples in the voltage and current of the dc-side during unbalanced grid conditions. Controllers for this purpose are investigated using a continuous model of the modular multilevel converter (M2C). The proposed scheme utilizes an open-loop controller for lower level control of the M2C. The continuous model used also has the capability to model blocking and deblocking events which may be used during protective actions. Simulation results reveal that the proposed NSCC scheme is effective in suppressing dc-side voltage and current ripples. Moreover, it keeps the ac-side phase currents balanced during asymmetrical fault conditions.

Place, publisher, year, edition, pages
2013.
Series
2013 15th European Conference on Power Electronics and Applications, EPE 2013
Keyword [en]
Fault handling strategy, HVDC, Modeling, Multilevel converters, Power transmission
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-139412DOI: 10.1109/EPE.2013.6634635Scopus ID: 2-s2.0-84890226294ISBN: 9781479901166 (print)OAI: oai:DiVA.org:kth-139412DiVA: diva2:688225
Conference
2013 15th European Conference on Power Electronics and Applications, EPE 2013, 2 September 2013 through 6 September 2013, Lille
Note

QC 20140116

Available from: 2014-01-16 Created: 2014-01-13 Last updated: 2014-01-16Bibliographically approved

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Nee, Hans-Peter

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