Communication-Less Frequency Support from Offshore Wind Farms Connected to HVdc via Diode Rectifiers

Oscar Saborío-Romano*, Ali Bidadfar, Jayachandra Naidu Sakamuri, Lorenzo Zeni, Ömer Goksu, Nicolaos Antonio Cutululis

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

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Abstract

Before diode rectifier (DR) technology for connecting offshore wind farms (OWFs) to HVdc is deployed, in-depth studies are needed to assess the actual capabilities of DR-connected OWFs to contribute to the secure operation of the networks linked to them. This study assesses the capability of such an OWF to provide communication-less frequency support (CLFS) to an onshore ac network. It is shown that the HVdc link's offshore terminal direct voltage can be estimated from measurements at the OWF's point of connection with the DR platform. Two different methods are proposed for implementing CLFS in the OWF active power controls. In Method 1, the estimated offshore terminal direct voltage is used for estimating the onshore frequency deviation. In Method 2, the actual offshore terminal direct voltage measurement is used instead. Unique features of the provision of CLFS from OWFs connected to HVdc via DRs are highlighted, and the dynamic and static performance of the CLFS control scheme is compared to that of the communication-based frequency support scheme. To assess the impact of parameter estimation errors on the provision of CLFS, a parametric sensitivity study is presented as well, and recommendations are given to increase accuracy.
Original languageEnglish
JournalIEEE Transactions on Sustainable Energy
Volume12
Issue number1
Pages (from-to)441-450
Number of pages10
ISSN1949-3029
DOIs
Publication statusPublished - 2021

Keywords

  • Diode-rectifier-based HVdc transmission
  • Frequency support
  • Grid-forming wind turbine control
  • Offshore wind energy integration
  • Primary frequency response

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