Planning and Control of Offshore VSC-HVDC Multi-terminal Transmission Grids

Project Description

COBRAcable is a sub-sea power link between Denmark and The Netherlands that will enter in operation in 2019. The
link intends to improve the security of supply and to integrate more renewable energy in European power network, while developing and implementing new transmission technology, as it is multiterminal HVDC-VSC.

Point-to-point connections through HVDC-VSC have been made (e.g., Skagerrak, Cross Sound Cable) and the next technological step is the development of multiterminal HVDC-VSC links. The COBRAcable is to be initially used as a two-terminal link, but later connections to offshore wind-farms and/or oil/gas platforms must be a possibility. In that case the link will be operated as a multiterminal link, a scheme that has not yet been tried outside of controllable environments.

This project consists in academia-industry collaboration with the end goal of designing guidelines and requirements for the operation of the COBRAcable as a fully functional multiterminal HVDC-VSC link. Several of the main technical issues hindering the implementation of the technology will be solved and solutions proposed for a more efficient operation of the COBRAcable.

Expected Results/Objectives

  • Allow operating the COBRAcable as a fully functional multiterminal VSC-HVDC link;
  • Set of guidelines for future connections and a specification of the desirable range of controllability of the converters;
  • Minimum requirements for the connection of a 3rd terminal to the HVDC link;
  • Guidelines for the different types of stability issues.


Associate Professor Filipe Miguel Faria da Silva
Direct phone: +45 9940 9280

Project Period



Aalborg University: 1 Full Prof., 1 Associ. Prof., 1 post-doc (full-time), 1 PhD student (full-time)

Technical University of Delft: 1 Full Prof., 1 Assist. Prof., 1 post-doc (full-time), 1 PhD student (full-time)