Coordinated Voltage Control in Offshore HVDC Connected Cluster of Wind Power Plants

Jayachandra N. Sakamuri, Zakir Hussain Rather, Johan Rimez, Müfit Altin, Ömer Göksu, Nicolaos Antonio Cutululis

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

This paper presents a coordinated voltage control scheme (CVCS) for a cluster of offshore wind power plants (OWPPs) connected to a VSC HVDC system. The primary control point of the proposed voltage control scheme is the introduced Pilot bus, which is having the highest short circuit
capacity in the offshore AC grid. The developed CVCS comprehends an optimization algorithm, aiming for minimum active power losses in the offshore grid, to generate voltage reference to the Pilot bus. During steady state operation, the Pilot bus voltage is controlled by dispatching reactive power references to each wind turbine (WT) in the WPP cluster based on their available reactive power margin and network sensitivity based participation factors, which are derived from the dV/dQ sensitivity of a WT bus w.r.t the Pilot bus. This method leads to minimization of the risk of undesired effects, particularly overvoltage at the terminals of the WT located far away from the AC collector substation, by dispatching lower reactive power references compared to the ones nearer to the substation. In addition, the paper proposes a control strategy for improved voltage ride through capability of WTs for faults in the offshore grid, thus leading to improved dynamic voltage profile in the offshore AC grid.
Original languageEnglish
JournalIEEE Transactions on Sustainable Energy
Volume7
Issue number4
Pages (from-to) 1592-1601
Number of pages10
ISSN1949-3029
DOIs
Publication statusPublished - 2016

Keywords

  • Cluster voltage controls
  • HVDC
  • Power loss
  • Offshore wind power plants
  • Reactive power dispatch
  • Voltage ride through

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