Operation of a hybrid modular multilevel converter during grid voltage unbalance
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 HV...
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| Format: | Article |
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IET
2016
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| Online Access: | https://eprints.nottingham.ac.uk/37543/ |
| _version_ | 1848795481460703232 |
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| author | Amankwah, Emmanuel K. Watson, Alan James Clare, Jon C. |
| author_facet | Amankwah, Emmanuel K. Watson, Alan James Clare, Jon C. |
| author_sort | Amankwah, Emmanuel K. |
| building | Nottingham Research Data Repository |
| collection | Online Access |
| description | 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. |
| first_indexed | 2025-11-14T19:32:46Z |
| format | Article |
| id | nottingham-37543 |
| institution | University of Nottingham Malaysia Campus |
| institution_category | Local University |
| last_indexed | 2025-11-14T19:32:46Z |
| publishDate | 2016 |
| publisher | IET |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | nottingham-375432020-05-04T18:13:47Z https://eprints.nottingham.ac.uk/37543/ Operation of a hybrid modular multilevel converter during grid voltage unbalance Amankwah, Emmanuel K. Watson, Alan James Clare, Jon C. 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. IET 2016-09-02 Article PeerReviewed Amankwah, Emmanuel K., Watson, Alan James and Clare, Jon C. (2016) Operation of a hybrid modular multilevel converter during grid voltage unbalance. IET Generation, Transmission & Distribution, 10 (12). pp. 3102-3110. ISSN 1751-8695 Offshore installations; HVDC power transmission; Power system harmonics http://digital-library.theiet.org/content/journals/10.1049/iet-gtd.2015.0766 doi:10.1049/iet-gtd.2015.0766 doi:10.1049/iet-gtd.2015.0766 |
| spellingShingle | Offshore installations; HVDC power transmission; Power system harmonics Amankwah, Emmanuel K. Watson, Alan James Clare, Jon C. Operation of a hybrid modular multilevel converter during grid voltage unbalance |
| title | Operation of a hybrid modular multilevel converter during grid voltage unbalance |
| title_full | Operation of a hybrid modular multilevel converter during grid voltage unbalance |
| title_fullStr | Operation of a hybrid modular multilevel converter during grid voltage unbalance |
| title_full_unstemmed | Operation of a hybrid modular multilevel converter during grid voltage unbalance |
| title_short | Operation of a hybrid modular multilevel converter during grid voltage unbalance |
| title_sort | operation of a hybrid modular multilevel converter during grid voltage unbalance |
| topic | Offshore installations; HVDC power transmission; Power system harmonics |
| url | https://eprints.nottingham.ac.uk/37543/ https://eprints.nottingham.ac.uk/37543/ https://eprints.nottingham.ac.uk/37543/ |