An assessment of converter modelling needs for offshore wind power plants connected via VSC-HVDC networks

Jakob Bærholm Glasdam, Lorenzo Zeni, Jesper Hjerrild, Łukasz Kocewiak, Bo Hesselbæk, Poul E. Sørensen, Anca D. Hansen, Claus Leth Bak, Philip C. Kjær

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Modular multilevel cascaded converter (MMCC) based high voltage direct current (HVDC) transmission is technically superior to other technologies, especially in case of connection of offshore wind power plants (OWPPs). Modelling challenges are faced by OWPP developers, who are not acquainted with detailed information regarding the internal behaviour of such complex devices.
This paper presents an investigation of the modelling requirements of the MMCC HVDC system, based on comparison between simulation results using a detailed HVDC representation in PSCAD/EMTDC and two less detailed models realised in EMT and RMS environments in DIgSILENT PowerFactory, respectively.
The results show that the simplified EMT/RMS models can be trusted for slow dynamic studies like those related to power control considered in this work. The results obtained from the detailed EMT model highlights the necessity for voltage balancing of the distributed capacitor voltages in the MMCC for both steady state operating conditions and during dynamic events such as step changes in the reference signals.
Original languageEnglish
Title of host publicationProceedings of the 12th Wind Integration Workshop : International Workshop on Large-Scale Integration of Wind Power into Power Systems as well as on Transmission Networks for Offshore Wind Plants
Number of pages6
Publication dateOct 2013
ISBN (Print)978-3-9813870-7-0
Publication statusPublished - Oct 2013
Event12th Wind Integration Workshop - London, United Kingdom
Duration: 22 Oct 201324 Oct 2013


Conference12th Wind Integration Workshop
Country/TerritoryUnited Kingdom


  • HVDC
  • Wind power integration and control
  • DIgSILENT PowerFactory


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