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Control of a VSC-HVDC operating in Parallel with AC Transmission Lines
KTH, School of Electrical Engineering (EES), Electric Power Systems.
KTH, School of Electrical Engineering (EES), Electric Power Systems.ORCID iD: 0000-0002-6431-9104
KTH, School of Electrical Engineering (EES), Electric Power Systems.ORCID iD: 0000-0002-8189-2420
2006 (English)In: 2006 IEEE/PES TRANSMISSION & DISTRIBUTION CONFERENCE & EXPOSITION, 2006, 917-921 p.Conference paper (Refereed)
Abstract [en]

As part of an analysis of a VSC-HVDC operating in parallel with AC transmission lines, this paper presents an adaptive control of VSC-HVDC that allows the device: to provide voltage support by means of reactive control at both ends; to damp power oscillations and improve transient stability by controlling either active or reactive power; and to control the power flow through the HVDC link. Simulations showed that the control operated correctly and that the VSC-HVDC significantly contributed to voltage stability, damping of power oscillations and improving of transient stability.

Place, publisher, year, edition, pages
2006. 917-921 p.
Keyword [en]
Ddamping of power oscillations, load flow control, transient stability, voltage control, VSC-HVdc
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-32305DOI: 10.1109/TDCLA.2006.311394ISI: 000246244800168ScopusID: 2-s2.0-82955169519ISBN: 978-1-4244-0287-8OAI: diva2:409887
QC 20110411Available from: 2011-04-11 Created: 2011-04-11 Last updated: 2011-04-12Bibliographically approved
In thesis
1. Modeling and Control of VSC-HVDC Transmissions
Open this publication in new window or tab >>Modeling and Control of VSC-HVDC Transmissions
2011 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Presently power systems are being operated under high stress level conditions unforeseen at the moment they were designed. These operating conditions have negatively impacted reliability, controllability and security margins.

FACTS devices and HVDC transmissions have emerged as solutions to help power systems to increase the stability margins. VSC-HVDC transmissions are of particular interest since the principal characteristic of this type of transmission is its ability to independently control active power and reactive power.

This thesis presents various control strategies to improve damping of electromechanical oscillations, and also enhance transient and voltage stability by using VSC-HVDC transmissions. These control strategies are based of different theory frames, namely, modal analysis, nonlinear control (Lyapunov theory) and model predictive control. In the derivation of the control strategies two models of VSC-HVDC transmissions were also derived. They are Injection Model and Simple Model. Simulations done in the HVDC Light Open Model showed the validity of the derived models of VSC-HVDC transmissions and the effectiveness of the control strategies.

Furthermore the thesis presents an analysis of local and remote information used as inputs signals in the control strategies. It also describes an approach to relate modal analysis and the SIME method. This approach allowed the application of SIME method with a reduced number of generators, which were selected based on modal analysis.

As a general conclusion it was shown that VSC-HVDC transmissions with an appropriate input signal and control strategy was an effective means to improve the system stability.


Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2011. x, 75 p.
Trita-EE, ISSN 1653-5146 ; 2011:024
Control Lyapunov Functions, Energy Function, Modal Analysis, Transient Stability, Voltage Stability, VSC-HVDC Transmission.
National Category
Engineering and Technology
urn:nbn:se:kth:diva-32313 (URN)978-91-7415-924-0 (ISBN)
Public defence
2011-05-04, H1, Teknikringen 33, Stockholm, 09:00 (English)
QC 20110412Available from: 2011-04-12 Created: 2011-04-11 Last updated: 2011-04-13Bibliographically approved

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