Advanced fault ride-through strategy by an MMC HVDC transmission for off-shore wind farm interconnection

Junghun Lee, Yeuntae Yoo, Minhan Yoon, Gilsoo Jang

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


In order to solve the problems brought upon by off-shore wind-power plants, it is important to improve fault ride-through capability when an on-shore fault occurs in order to prevent DC overvoltage. In this paper, a coordinated control strategy is implemented for a doubly-fed induction generator (DFIG)-based off-shore wind farm, which connects to on-shore land by a modular multilevel converter (MMC)-based high voltage direct current (HVDC) transmission system during an on-shore fault. The proposed control strategy adjusts the DC voltage of the off-shore converter to ride through fault condition, simultaneously varying off-shore AC frequency. The grid-side converter detects the frequency difference, and the rotor-side converter curtails the output power of the DFIG. The surplus energy will be accumulated at the rotor by accelerating the rotor speed and DC link by rising DC voltage. By the time the fault ends, energy stored in the rotor and energy stored in the DC capacitor will be released to the on-shore side to restore the normal transmission state. Based on the control strategy, the off-shore wind farm will ride through an on-shore fault with minimum rotor stress. To verify the validity of the proposed control strategy, a DFIG-based wind farm connecting to the on-shore side by an MMC HVDC system is simulated by PSCAD with an on-shore Point of Common Coupling side fault scenario.

Original languageEnglish
Article number522
JournalApplied Sciences (Switzerland)
Issue number12
Publication statusPublished - 2019 Jun 1

Bibliographical note

Funding Information:
Acknowledgments: This work was supported under the framework of the international cooperation program managed by the National Research Foundation of Korea (No. 2017K1A4A3013579) and the Human Resources Program in Energy Technology of the Korean Institute of Energy Technology Evaluation and Planning (KETEP) financial resources granted by the Ministry of Trade, Industry & Energy, Republic of Korea (No. 20174030201540).

Publisher Copyright:
© 2019 by the authors.


  • Doubly-fed induction generator (DFIG)
  • Fault ride-through (FRT)
  • High voltage direct current (HVDC) system
  • Off-shore wind farm
  • Variable frequency
  • Voltage sourced converter (VSC)

ASJC Scopus subject areas

  • General Materials Science
  • Instrumentation
  • General Engineering
  • Process Chemistry and Technology
  • Computer Science Applications
  • Fluid Flow and Transfer Processes


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