All-DC offshore wind farms: when are they more cost-effective than AC designs?

Victor Timmers, Agustí Egea-Àlvarez, Aris Gkountaras, Rui Li, Lie Xu

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)
401 Downloads (Pure)

Abstract

The use of MVDC collector systems has been proposed as a way to reduce the levelised cost of energy (LCOE) of offshore wind farms. This study provides a quantitative assessment of the conditions required for such all-DC wind farms to be cost-effective. A comprehensive LCOE analysis of two AC and two all-DC wind farm designs is performed, with sensitivity studies on wind farm size, distance from shore, collector voltage, and component costs. The results show that for MVDC-based wind farms to be more cost-effective than equivalent HVDC wind farms, the DC/DC converter cost must be less than 90% of the cost of an equivalent MMC, with a cost reduction of 25% for the DC platform. Alternatively, if cost reductions of 30% can be achieved for the DC platform, then the DC/DC converter can be the same cost as an equivalent MMC. For all-MVDC wind farms without HVDC conversion stage to have the lowest LCOE, the collector voltage must be increased, preferably to ±100 kV or above. The all-MVDC configuration can also become cost-effective if a reduction of more than 50% in the cable installation cost can be achieved, for example through the simultaneous burial of multiple cables.
Original languageEnglish
Pages (from-to)2458-2470
Number of pages13
JournalIET Renewable Power Generation
Volume17
Issue number10
Early online date17 Jul 2022
DOIs
Publication statusPublished - 17 Jul 2022

Keywords

  • all-DC wind farms
  • offshore wiind farms
  • cost-effective
  • AC designs
  • MVDC collector systems

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