DC/DC converters based on hybrid MMC for HVDC grid interconnection

Rong Zeng, Lie Xu, Liangzhong Yao

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

42 Citations (Scopus)
104 Downloads (Pure)


This paper presents a multi-terminal high-power DC/DC converter configuration based on hybrid MMC topology with fault blocking capability for interconnecting HVDC systems. Its main functions include bidirectional power flow, step-up and step-down operation and fault isolation equivalent to a DC circuit breaker. By contrast to the conventional MMC based DC/DC converter, the proposed DC/DC converter with hybrid MMC configuration has the advantage of being able to block the DC/DC converter terminal connecting to faulty DC grid section, while continue operating the other terminals connected to healthy DC grid sections. The proposed DC/DC converter operation is analyzed and its control is described. Simulation results using Matlab/Simulink are presented to demonstrate the robust performance during dc fault conditions.
Original languageEnglish
Title of host publication11th IET International Conference on AC and DC Power Transmission
Number of pages6
Publication statusPublished - 1 Feb 2015


  • bidirectional power flow
  • step-up operation
  • step-down operation
  • simulink
  • power transmission faults
  • power system interconnection
  • power grids
  • circuit breakers
  • DC/DC converter


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