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

I. A. Gowaid, G. P. Adam, A. M. Massoud, Shehab Ahmed, D. Holliday, B. W. Williams

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

15 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.

Original languageEnglish
Title of host publication2014 16th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2014
PublisherInstitute of Electrical and Electronics Engineers Inc.
ISBN (Electronic)9781479930159
DOIs
Publication statusPublished - 25 Sep 2014
Event2014 16th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2014 - Lappeenranta, Finland
Duration: 26 Aug 201428 Aug 2014

Other

Other2014 16th European Conference on Power Electronics and Applications, EPE-ECCE Europe 2014
CountryFinland
CityLappeenranta
Period26/8/1428/8/14

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Keywords

  • High voltage power converters
  • HVDC
  • Multilevel converters
  • Power transmission
  • Voltage Source Converter (VSC)

ASJC Scopus subject areas

  • Electrical and Electronic Engineering

Cite this

Gowaid, I. A., Adam, 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-ECCE Europe 2014 [6911044] Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/EPE.2014.6911044