Operation analysis of thyristor based front-to-front active-forced-commutated bridge DC transformer in LCC and VSC hybrid HVDC networks

Peng Li, Grain P. Adam, Stephen J. Finney, Derrick Holliday

Research output: Contribution to journalArticle

15 Citations (Scopus)
132 Downloads (Pure)

Abstract

The active-forced-commutated (AFC) bridge employs a symmetrical thyristor-bridge with auxiliary self-commutated full-bridge chain-link (FB-CL) circuit to assist its soft transition and forced commutation. This combination can form a thyristor based voltage source converter (VSC) with significantly reduced on-state losses and dc-fault blocking capability. Due to the full topological symmetry of the AFC-bridge, either current direction or dc-link voltage polarity can be reversed for power flow reversal as for the full-bridge modular multilevel converter (FB-MMC). Thus, the AFC-bridge is compatible with both line-commutated-converter (LCC) and VSC terminals in a multi-terminal high voltage direct current (MT-HVDC) network. This paper investigates its front-to-front (F2F) dc-dc application for matching the regional dc grids in a LCC and VSC hybrid HVDC network. Simulation studies are carried out to demonstrate its potentials as a high efficiency multi-functional solution for dc-dc conversion.
Original languageEnglish
Pages (from-to)1657-1669
Number of pages12
JournalIEEE Journal of Emerging and Selected Topics in Power Electronics
Volume5
Issue number4
Early online date14 Aug 2017
DOIs
Publication statusPublished - 1 Dec 2017

Keywords

  • thyristors
  • voltage control
  • HVDC transmission
  • bridge circuits
  • topology
  • load flow
  • active-forced-commutated bridge
  • IGBT
  • high efficiency VSC
  • front-to-front dc-dc converter
  • dc-link voltage reversal
  • LCC and VSC hybrid HVDC grid

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