Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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Hybrid Double Direction Blocking Sub-Module for MMC-HVDC Design and Control

  • Zhang, Jianpo (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University) ;
  • Cui, Diqiong (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University) ;
  • Tian, Xincheng (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University) ;
  • Zhao, Chengyong (State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources, North China Electric Power University)
  • Received : 2018.06.17
  • Accepted : 2019.08.26
  • Published : 2019.11.20
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Abstract

Dealing with the DC link fault poses a technical problem for an HVDC based on a modular multilevel converter. The fault suppressing mechanisms of several sub-module topologies with DC fault current blocking capacity are examined in this paper. An improved half-bridge sub-module topology with double direction control switch is also designed to address the additional power consumption problem, and a sub-module topology called hybrid double direction blocking sub module (HDDBSM) is proposed. The DC fault suppression characteristics and sub-module capacitor voltage balance problem is also analyzed, and a self-startup method is designed according to the number of capacitors. The simulation model in PSCAD/EMTDC is built to verify the self-startup process and the DC link fault suppression features.

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References

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