Capability curves of a VSC-HVDC connected to a weak AC grid considering stability and power limits

Agustí Egea-Alvarez, Carl Barker, Fainan Hassan, Oriol Gomis-Bellmunt

Research output: Chapter in Book/Report/Conference proceedingConference contribution book

12 Citations (Scopus)


The connection point of a VSC-HVDC for the transmission of RES electricity, can be located far from the large generation plants, leading to a weak grid connection. This paper analyses the limitations on the power flow transfer through a VSCHVDC system connected to a weak grid. First, the impact of the angle and voltage stability limits and the VSC rating are examined. Then, the power transfer capability curves of a VSC connected to a weak grid of an SCR of 1.1 pu by means of an L-interface are calculated. Finally, the impact of providing additional reactive power (Q) support is investigated through utilising a capacitor at the connection point. It has been shown that an additional Q-support of 0.2 pu can maintain the transfer of full power without the need for oversizing the VSC.

Original languageEnglish
Title of host publication AC and DC Power Transmission, 11th IET International Conference on
PublisherInstitution of Engineering and Technology
Number of pages5
ISBN (Print)9781849199827
Publication statusPublished - 13 Jul 2015
Externally publishedYes
Event11th IET International Conference on AC and DC Power Transmission - Birmingham, United Kingdom
Duration: 10 Feb 201512 Feb 2015


Conference11th IET International Conference on AC and DC Power Transmission
Country/TerritoryUnited Kingdom
Internet address


  • capability curves
  • short circuit ratio (SCR)
  • weak grids

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