Modular multilevel structure of a high power dual active bridge DC transformer with stepped two-level output

I. A. Gowaid, G. P. Ased, A. M. Massoud, S. Ahmed, D. Holliday, B. W. Williams

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

14 Citations (Scopus)

Abstract

This paper addresses the issues of dc voltage matching and dc fault protection in potential super-grids. An approach for high power dc-dc conversion is proposed and analyzed. A front-to-front connection of modular-multilevel converters (MMC) forms a dual active bridge (DAB)-like structure. Near two-level operation is achieved by sequential switching of half-bridge chopper cells. This alleviates dv/dt stress exercised by two-level DAB configurations on the ac stage. The operating mode, switching patterns necessary are distinct from conventional MMC. Furthermore, common-mode currents, cell capacitance size, arm inductances are significantly reduced. The considered structure is shown to be useful for high power applications due to the low switching frequency, modularity, reliability and dc fault isolation capability. Various operation aspects are illustrated using simulations. A reduced-scale test rig provides an experimental proof of the concept.
LanguageEnglish
Title of host publication2014 16th European Conference on Power Electronics and Applications (EPE'14-ECCE Europe)
Place of PublicationPiscataway, NJ.
PublisherIEEE
Number of pages10
ISBN (Electronic)9781479930159
DOIs
Publication statusPublished - 29 Sep 2014

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DC transformers
Sequential switching
Switching frequency
Inductance
Capacitance
Electric potential

Keywords

  • HVDC
  • multilevel converters
  • high voltage power converters
  • power transmission
  • voltage source converter (VSC)

Cite this

Gowaid, I. A., Ased, G. P., Massoud, A. M., Ahmed, S., Holliday, D., & Williams, B. W. (2014). Modular multilevel structure of a high power dual active bridge DC transformer with stepped two-level output. In 2014 16th European Conference on Power Electronics and Applications (EPE'14-ECCE Europe) Piscataway, NJ.: IEEE. https://doi.org/10.1109/EPE.2014.6911044
Gowaid, I. A. ; Ased, G. P. ; Massoud, A. M. ; Ahmed, S. ; Holliday, D. ; Williams, B. W. / Modular multilevel structure of a high power dual active bridge DC transformer with stepped two-level output. 2014 16th European Conference on Power Electronics and Applications (EPE'14-ECCE Europe). Piscataway, NJ. : IEEE, 2014.
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abstract = "This paper addresses the issues of dc voltage matching and dc fault protection in potential super-grids. An approach for high power dc-dc conversion is proposed and analyzed. A front-to-front connection of modular-multilevel converters (MMC) forms a dual active bridge (DAB)-like structure. Near two-level operation is achieved by sequential switching of half-bridge chopper cells. This alleviates dv/dt stress exercised by two-level DAB configurations on the ac stage. The operating mode, switching patterns necessary are distinct from conventional MMC. Furthermore, common-mode currents, cell capacitance size, arm inductances are significantly reduced. The considered structure is shown to be useful for high power applications due to the low switching frequency, modularity, reliability and dc fault isolation capability. Various operation aspects are illustrated using simulations. A reduced-scale test rig provides an experimental proof of the concept.",
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Gowaid, IA, Ased, GP, Massoud, AM, Ahmed, S, Holliday, D & Williams, BW 2014, Modular multilevel structure of a high power dual active bridge DC transformer with stepped two-level output. in 2014 16th European Conference on Power Electronics and Applications (EPE'14-ECCE Europe). IEEE, Piscataway, NJ. https://doi.org/10.1109/EPE.2014.6911044

Modular multilevel structure of a high power dual active bridge DC transformer with stepped two-level output. / Gowaid, I. A. ; Ased, G. P.; Massoud, A. M.; Ahmed, S.; Holliday, D.; Williams, B. W.

2014 16th European Conference on Power Electronics and Applications (EPE'14-ECCE Europe). Piscataway, NJ. : IEEE, 2014.

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

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AB - This paper addresses the issues of dc voltage matching and dc fault protection in potential super-grids. An approach for high power dc-dc conversion is proposed and analyzed. A front-to-front connection of modular-multilevel converters (MMC) forms a dual active bridge (DAB)-like structure. Near two-level operation is achieved by sequential switching of half-bridge chopper cells. This alleviates dv/dt stress exercised by two-level DAB configurations on the ac stage. The operating mode, switching patterns necessary are distinct from conventional MMC. Furthermore, common-mode currents, cell capacitance size, arm inductances are significantly reduced. The considered structure is shown to be useful for high power applications due to the low switching frequency, modularity, reliability and dc fault isolation capability. Various operation aspects are illustrated using simulations. A reduced-scale test rig provides an experimental proof of the concept.

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KW - power transmission

KW - voltage source converter (VSC)

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Gowaid IA, Ased GP, Massoud AM, Ahmed S, Holliday D, Williams BW. Modular multilevel structure of a high power dual active bridge DC transformer with stepped two-level output. In 2014 16th European Conference on Power Electronics and Applications (EPE'14-ECCE Europe). Piscataway, NJ.: IEEE. 2014 https://doi.org/10.1109/EPE.2014.6911044