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Improvement of Power System Stability by Using 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
2011 (English)In: International Journal of Electrical Power & Energy Systems, ISSN 0142-0615, E-ISSN 1879-3517, Vol. 33, no 2, 332-339 p.Article in journal (Refereed) Published
Abstract [en]

The capabilities of a VSC-HVdc to improve the stability in power systems are analyzed in this paper. The analysis considers a power system which has the need for increasing the transmission capacity. Two options are analyzed: connection of a new ac transmission line or connection of a VSC-HVdc link. Different disturbances are applied in the system in order to analyze the dynamic response of the system. Supplementary control is included in the control of the VSC-HVdc. The control strategies in the supplementary control are based on nonlinear and linear theory. Furthermore, remote and local information are used as input signals in the control strategies. Simulation results clearly showed the benefits of VSC-HVdc in the improvement of power system stability.

Place, publisher, year, edition, pages
2011. Vol. 33, no 2, 332-339 p.
Keyword [en]
CLF, Power oscillation damping, Small signal analysis, Voltage stability, VSC-HVdc
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-32310DOI: 10.1016/j.ijepes.2010.08.030ISI: 000289500700020Scopus ID: 2-s2.0-78650901414OAI: oai:DiVA.org:kth-32310DiVA: diva2:409897
Note
QC 20110411Available from: 2011-04-11 Created: 2011-04-11 Last updated: 2017-12-11Bibliographically 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.
Series
Trita-EE, ISSN 1653-5146 ; 2011:024
Keyword
Control Lyapunov Functions, Energy Function, Modal Analysis, Transient Stability, Voltage Stability, VSC-HVDC Transmission.
National Category
Engineering and Technology
Identifiers
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)
Opponent
Supervisors
Note
QC 20110412Available from: 2011-04-12 Created: 2011-04-11 Last updated: 2011-04-13Bibliographically approved

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Ghandhari, Mehrdad

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