Coordinated Control of Wind Turbines in Diode-Rectifier-connected Offshore Wind Power Plants with Frequency Support Capability

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Lower costs and higher reliability make diode rectifiers (DRs) a promising alternative for connecting offshore wind power plants to HVdc networks. However, such offshore substations lack the grid-forming capability provided by voltage source converters. Hence, the grid-side converters of type-4 (fullconverter) wind turbines (WTs) have been proposed as viable candidates to take over such responsibility, apart from controlling the WT output power. In this work, a common synchronization reference (CSR) is proposed for the synchronization of such converters. Such reference is generated in the offshore HVdc substation and transmitted to the converters through the optical fibers embedded in the power cables. The proposed CSR enables the use of conventional current control for grid-forming WTs. Additionally, a scheme which combines communication-less and communication-based onshore frequency support is proposed and implemented. The proposed controls are validated by simulations under different operational scenarios.
Original languageEnglish
Title of host publicationProceedings of the 18th Wind Integration Workshop
Number of pages6
Publication date2019
Publication statusPublished - 2019
Event18th Wind Integration Workshop: International workshop on large-scale integration of wind power into power systems as well as on transmission networks for offshore wind power plants - Crowne Plaza Dublin Airport, Dublin, Ireland
Duration: 16 Oct 201918 Oct 2019
Conference number: 18


Workshop18th Wind Integration Workshop
LocationCrowne Plaza Dublin Airport
Internet address


  • Common synchronization reference
  • Dioderectifier-based HVdc transmission
  • Frequency support
  • Grid-forming wind turbine control
  • Offshore wind energy integration


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