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Operation of a hybrid modular multilevel converter during grid voltage unbalance

Amankwah, Emmanuel K.; Watson, Alan James; Clare, Jon C.

Authors

Emmanuel K. Amankwah ezzea@exmail.nottingham.ac.uk

Alan James Watson alan.watson@nottingham.ac.uk

Jon C. Clare jon.clare@nottingham.ac.uk



Abstract

The recently proposed parallel hybrid modular multilevel converter is considered to be a low loss, low component count converter with soft switching capability of the ‘main’ H-bridge. The converter has similar advantages to other emerging modular multilevel converter circuits being considered for HVDC power transmission and can be made compact which is desirable for offshore application. However, during ac network unbalance the individual ‘chain-links’ exchange unequal amounts of power with the grid which requires appropriate remedial action. This paper presents research into the performance of the converter and proposes a suitable control method that enables the converter to operate during grid voltage unbalance. The proposed control concept involves the use of asymmetric third harmonic voltage generation in the ‘chain-links’ of the converter to redistribute the power exchanged between the individual ‘chain-links’ and the grid. Mathematical analysis and simulation modelling with results are presented to support the work described.

Journal Article Type Article
Publication Date Sep 2, 2016
Journal IET Generation, Transmission & Distribution
Print ISSN 1751-8687
Electronic ISSN 1751-8695
Publisher Institution of Engineering and Technology (IET)
Peer Reviewed Peer Reviewed
Volume 10
Issue 12
APA6 Citation Amankwah, E. K., Watson, A. J., & Clare, J. C. (2016). Operation of a hybrid modular multilevel converter during grid voltage unbalance. IET Generation, Transmission and Distribution, 10(12), doi:10.1049/iet-gtd.2015.0766
DOI https://doi.org/10.1049/iet-gtd.2015.0766
Keywords Offshore installations; HVDC power transmission; Power system harmonics
Publisher URL http://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2015.0766
Copyright Statement Copyright information regarding this work can be found at the following address: http://eprints.nottingh.../end_user_agreement.pdf
Additional Information This paper is a postprint of a paper submitted to and accepted for publication in IET Generation, Transmission and Distribution and is subject to Institution of Engineering and Technology Copyright. The copy of record is available at IET Digital Library

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Copyright Statement
Copyright information regarding this work can be found at the following address: http://eprints.nottingham.ac.uk/end_user_agreement.pdf





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