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Special Issue "Control and Protection of HVDC-Connected Offshore Wind Power Plants"

A special issue of Energies (ISSN 1996-1073). This special issue belongs to the section "Wind, Wave and Tidal Energy".

Deadline for manuscript submissions: 30 November 2019

Special Issue Editors

Guest Editor
Dr. Ömer Göksu

Department of Wind Energy, Technical University of Denmark, Copenhagen, Denmark
Website | E-Mail
Interests: Control and modelling of wind turbines/wind power plants; wind turbine converter control; grid integration; grid services; grid codes; HVDC connections; fault analysis
Guest Editor
Dr. Jayachandra N. Sakamuri

Department of Wind Energy, Technical University of Denmark, Copenhagen, Denmark
Website | E-Mail
Interests: HVDC control and modelling; HVDC converter control; multi-terminal DC grids; HVDC grid protection; integration of wind and solar; high voltage switchgear
Guest Editor
Dr. Nicolaos A. Cutululis

Department of Wind Energy, Technical University of Denmark, Copenhagen, Denmark
Website | E-Mail
Phone: +3421324965
Interests: integration of wind power; offshore wind power and grids; modelling and control of wind turbines and farms; wind power variability and ancillary services from wind power

Special Issue Information

Dear colleagues,

As offshore wind power plant (OWPP) sites are getting very far from onshore connection points, HVDC connection is becoming the preferred solution over long AC connection today. The ambitious targets for offshore wind installations in the EU 2030 and 2050 plans will also require more DC connections. DC-interconnected HVDC networks (multiterminal/meshed HVDC) within the North Sea are also being considered as a future solution. The control and protection schemes in the 100% converter-based offshore network require special considerations due to the characteristics of the converters (wind turbine and HVDC converters). There are additional challenges in terms of harmonic interactions and instabilities in the HVDC-based offshore networks. Moreover, considering the high share of offshore wind in the power systems, certain system services need to be provided from HVDC-connected OWPPs. Overall, novel control and design for the offshore HVDC network (e.g. OWPP design, HVDC converter technologies) would be adopted for the efficient deployment of offshore wind. The focus of this Special Issue includes (but is not limited to):

Control of HVDC-connected OWPPs:

  • Parallel HVDC converters
  • Cluster control of several OWPPs
  • Grid forming OWPPs
  • Stability and harmonic interactions

Protection of HVDC-based offshore networks:

  • Symmetrical/asymmetrical offshore AC faults
  • DC faults
  • Protection schemes
  • Field experiences

Long HVAC vs. HVDC transmission

Interconnection of HVDC offshore:

  • Multiterminal/meshed HVDC grids
  • AC interconnections offshore

Novel HVDC connection technologies:

  • Hybrid HVDC; e.g. VSC–LCC–DR (diode rectifier),
  • MMCs (half bridge/full bridge/mixed arm/novel MMC)
  • DC wind turbines/wind power plants

Grid services by HVDC-Connected OWPPs:

  • Synthetic inertia and frequency support
  • Black start
  • Voltage/reactive power support

Grid code analysis and recommendations

Dr. Ömer Göksu
Dr. Jayachandra N. Sakamuri
Dr. Nicolaos A. Cutululis
Guest Editors

Manuscript Submission Information

Manuscripts should be submitted online at www.mdpi.com by registering and logging in to this website. Once you are registered, click here to go to the submission form. Manuscripts can be submitted until the deadline. All papers will be peer-reviewed. Accepted papers will be published continuously in the journal (as soon as accepted) and will be listed together on the special issue website. Research articles, review articles as well as short communications are invited. For planned papers, a title and short abstract (about 100 words) can be sent to the Editorial Office for announcement on this website.

Submitted manuscripts should not have been published previously, nor be under consideration for publication elsewhere (except conference proceedings papers). All manuscripts are thoroughly refereed through a single-blind peer-review process. A guide for authors and other relevant information for submission of manuscripts is available on the Instructions for Authors page. Energies is an international peer-reviewed open access semimonthly journal published by MDPI.

Please visit the Instructions for Authors page before submitting a manuscript. The Article Processing Charge (APC) for publication in this open access journal is 1800 CHF (Swiss Francs). Submitted papers should be well formatted and use good English. Authors may use MDPI's English editing service prior to publication or during author revisions.

Keywords

  • wind power
  • offshore wind
  • HVAC
  • HVDC
  • control
  • protection
  • grid integration
  • grid codes
  • ancillary services
  • clusters
  • meshed offshore grids
  • multi-terminal DC grids
  • wind turbines

Published Papers (1 paper)

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Research

Open AccessArticle Control Strategies of Full-Voltage to Half-Voltage Operation for LCC and Hybrid LCC/MMC based UHVDC Systems
Energies 2019, 12(4), 742; https://doi.org/10.3390/en12040742
Received: 17 January 2019 / Revised: 14 February 2019 / Accepted: 20 February 2019 / Published: 23 February 2019
PDF Full-text (3779 KB) | HTML Full-text | XML Full-text
Abstract
With the increasing demand of transmitting bulk-power over long-distance, the ultra high-voltage direct-current (UHVDC) transmission systems become an attractive option. Nowadays, not only the line commutated converter (LCC) based systems, but also the modular multilevel converter (MMC) based systems have reached UHVDC levels. [...] Read more.
With the increasing demand of transmitting bulk-power over long-distance, the ultra high-voltage direct-current (UHVDC) transmission systems become an attractive option. Nowadays, not only the line commutated converter (LCC) based systems, but also the modular multilevel converter (MMC) based systems have reached UHVDC levels. The converter stations of UHVDC systems normally utilize two series-connected valve-groups to reduce the difficulties of device manufacturing and transportation. This high-voltage and low-voltage valve-group configuration allows the UHVDC systems to achieve a full-voltage to half-voltage operation which increases the flexibility of the systems. However, the existing research only focuses on the full-voltage to half-voltage control of LCC-UHVDC systems. The control strategies for hybrid LCC/MMC UHVDC systems are underresearched. Moreover, the approaches to reduce the load-shedding caused by the full-voltage to half-voltage control for both LCC and hybrid LCC/MMC based UHVDC systems have not been investigated. In this paper, full-voltage to half-voltage control strategies for both LCC and hybrid LCC/MMC based UHVDC systems have been proposed. Moreover, to avoid load-shedding caused by the half-voltage operation, a power rescheduling method that re-sets the power references of the half-voltage operating and full-voltage operating poles has been proposed. The proposed full-voltage to half-voltage control strategies and power rescheduling method can achieve a stable and fast control process with a minimum power loss. The proposed methods have been verified through the time-domain simulations conducted in PSCAD/EMTDC. Full article
(This article belongs to the Special Issue Control and Protection of HVDC-Connected Offshore Wind Power Plants)
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