Submodule configuration of HVDC-DC auto transformer considering DC fault

Zhiwen Suo, Gengyin Li, Rui Li, Lie Xu, Weisheng Wang, Yongning Chi, Wei Sun

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This paper studies the submodule configuration of MMC based non-isolated HVDC-DC autotransformer (HVDC-AT) with DC fault blocking capability, including two-terminal and multi-terminal topologies. The operation principle of the HVDC-AT is described. Considering the arm current differences, the total number of required semiconductors for the HVDC-AT is derived and is compared with the MMC based isolated front-to-front (F2F) DC transformer. A full operation process for the multi-terminal HVDC-AT considering DC fault is then presented, including normal operation, fault isolation and continuous operation of healthy converters after fault. The submodule configuration and fault recovery of the multi-terminal HVDC-AT are validated by simulations using PSCAD/EMTDC.
Original languageEnglish
Pages (from-to)1-24
Number of pages24
JournalIET Power Electronics
Publication statusAccepted/In press - 22 Aug 2016


  • renewable energy
  • HVDC technology
  • offshore wind power
  • modular multilevel converter


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