Stable and Passive High-Power Dual Active Bridge Converters Interfacing MVDC Grids

Francisco D. Freijedo*, Enrique Rodriguez-Diaz, Drazen Dujic

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

31 Citations (Scopus)
224 Downloads (Pure)

Abstract

Dual active bridge (DAB) is a topology that is receiving more and more attention as a potential solution to interface dc grids of different voltage levels. From a system level, the implications of DABs on the stability of complex power systems are addressed in this paper. Dynamics modeling and stability assessment for a DAB implementation aimed to interface low-voltage energy resources with medium-voltage dc (MVdc) collection and distribution grids are presented. The DAB admittance is analytically derived and assessed in order to describe its dynamics and anticipate its behavior when integrated in a complex MVdc grid. The model considers the low-frequency range, mostly dominated by the controller action, and the high-frequency range, described by a nonlinear operation. The theoretical analysis is verified by hardware-in-the-loop emulation, with the controller running on a digital signal processor. The proposed implementation is proved to achieve passivity in the whole spectrum, which undoubtedly is a desired feature for massive power electronics integration in the future MVdc grids.
Original languageEnglish
Article number8369156
JournalIEEE Transactions on Industrial Electronics
Volume65
Issue number12
Pages (from-to)9561-9570
Number of pages10
ISSN0278-0046
DOIs
Publication statusPublished - Dec 2018

Keywords

  • Admittance measurement
  • DC-DC power conversion
  • power generation control
  • stability

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