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Active and reactive power control of a VSC-HVdc
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
2008 (English)In: Electric power systems research, ISSN 0378-7796, Vol. 78, no 10, 1756-1763 p.Article in journal (Refereed) Published
Abstract [en]

Voltage source converter-based HVdc(VSC-HVdc) systems have the ability to rapidly control the transmitted active power, and also to independently exchange reactive power with transmissions systems. Due to these characteristics, VSC-HVdcs with a suitable control scheme can offer an alternative means to enhance transient stability, to improve power oscillations damping, and to provide voltage support. In this paper, a VSC-HVdc is represented by a simple model, referred to as the injection model. Based on this model, an energy function is developed for a multi-machine power system including VSC-HVdcs. Furthermore, based on Lyapunov theory (control Lyapunov function) and small signal analysis (modal analysis), various control strategies for transient stability and damping of low-frequency power oscillations are derived.

Place, publisher, year, edition, pages
2008. Vol. 78, no 10, 1756-1763 p.
Keyword [en]
control Lyapunov functions, modal analysis, power oscillations damping, transient stability, voltage support, VSC-HVdc
National Category
Engineering and Technology
URN: urn:nbn:se:kth:diva-17820DOI: 10.1016/j.epsr.2008.03.003ISI: 000259161800013ScopusID: 2-s2.0-45449091726OAI: diva2:335865
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 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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