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Open AccessFeature PaperArticle

Power Oscillation Damping from Offshore Wind Farms Connected to HVDC via Diode Rectifiers

1
Department of Wind Energy, Technical University of Denmark, Building 115, Risø Campus, Frederiksborgvej 399, 4000 Roskilde, Denmark
2
rsted Offshore, Nesa Allé 1, 2820 Gentofte, Denmark
*
Author to whom correspondence should be addressed.
Energies 2019, 12(17), 3387; https://doi.org/10.3390/en12173387
Received: 5 July 2019 / Revised: 16 August 2019 / Accepted: 21 August 2019 / Published: 2 September 2019
(This article belongs to the Special Issue Control and Protection of HVDC-Connected Offshore Wind Power Plants)
Diode rectifiers (DRs) have elicited increasing interest from both industry and academia as a feasible alternative for connecting offshore wind farms (OWFs) to HVDC networks. However, before such technology is deployed, more 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 assessed the capability of such an OWF to provide support to an onshore AC network by means of (active) power oscillation damping (POD). A semi-aggregated OWF representation was considered in order to examine the dynamics of each grid-forming wind turbine (WT) within a string when providing POD, while achieving reasonable simulation times. Simulation results corroborate that such an OWF can provide POD by means of OWF active power controls similar to those developed for OWFs connected to HVDC via voltage source converters, while its grid-forming WTs share the reactive power consumption/production and keep the offshore voltage frequency and magnitude within their normal operating ranges. Open-loop test results show that such capability can, however, be restricted at operating points corresponding to the lowest and highest values of active power output. View Full-Text
Keywords: diode-rectifier-based HVDC transmission; grid-forming wind turbine control; offshore wind energy integration; power oscillation damping diode-rectifier-based HVDC transmission; grid-forming wind turbine control; offshore wind energy integration; power oscillation damping
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Saborío-Romano, O.; Bidadfar, A.; Göksu, Ö.; Zeni, L.; Cutululis, N.A. Power Oscillation Damping from Offshore Wind Farms Connected to HVDC via Diode Rectifiers. Energies 2019, 12, 3387.

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