Pre-charging and DC fault ride-through of hybrid MMC based HVDC systems

Rong Zeng, Lie Xu, Liangzhong Yao, D John Morrow

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122 Citations (Scopus)
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Abstract

Compared to half-bridge based MMCs, full-bridge based systems have the advantage of blocking dc fault, but at the expense of increased power semiconductors and power losses. In view of the relationships among ac/dc voltages and currents in full-bridge based MMC with the negative voltage state, this paper provides a detailed analysis on the link between capacitor voltage variation and the maximum modulation index. A hybrid MMC, consisting of mixed half-bridge and full-bridge circuits to combine their respective advantages is investigated in terms of its pre-charging process and transient dc fault ride-through capability. Simulation and experiment results demonstrate the feasibility and validity of the proposed strategy for a full-bridge based MMC and the hybrid MMC.
Original languageEnglish
Number of pages9
JournalIEEE Transactions on Power Delivery
Early online date24 Sep 2014
DOIs
Publication statusPublished - 2015

Keywords

  • capacitor voltage ripple
  • modular multilevel converter
  • DC fault
  • hybrid power systems

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