An Overview of Modular Multilevel Converters in HVDC Transmission Systems With STATCOM Operation During Pole-to-Pole DC Short Circuits

Thanh Hai Nguyen, Khalifa Al Hosani, Mohamed S. El Moursi, Frede Blaabjerg

Research output: Contribution to journalJournal articleResearchpeer-review

49 Citations (Scopus)

Abstract

Fault-current handling capability of the modular multilevel converters (MMCs) under dc-cable short-circuit conditions is a major concern for the MMC applications on the high-voltage direct-current (HVDC) transmission systems, where the MMCs based on half-bridge submodules (SMs) cannot block the fault currents to protect the converter devices. In this paper, a comprehensive review for the fault-ride-through capability of the HVDC transmission systems based on the MMCs adopting different SM schemes is presented, where the MMCs can block the fault currents and compensate the reactive currents to the electric grid during the dc faults. An analysis of the dc short-circuit faults in the MMC is introduced and then the operation principle of different SM circuits building the MMC for blocking the fault currents is highlighted. The fault-tolerant operation of these MMC schemes as static synchronous compensator to enhance the ac grid stability during the dc faults is also investigated. A comparison in terms of investment cost, loss, volume, and controllability for various MMC topologies is performed. Comprehensive simulation results for the most promising topologies of the MMC with a capability of fault-ride through under dc-fault conditions are finally presented.
Original languageEnglish
Article number8424079
JournalI E E E Transactions on Power Electronics
Volume34
Issue number5
Pages (from-to)4137 - 4160
Number of pages24
ISSN0885-8993
DOIs
Publication statusPublished - May 2019

Keywords

  • DC short-circuit faults
  • Fault-handling capability
  • High-voltage direct-current (HVDC) transmission systems
  • Modular-multilevel converters
  • Static synchronous compensator (STATCOM)
  • Submodules (SMs)

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