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Use of Local and Remote Information in POD 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
2009 (English)In: 2009 IEEE BUCHAREST POWERTECH / [ed] Toma L; Otomega B, NEW YORK: IEEE , 2009, 793-798 p.Conference paper, Published paper (Refereed)
Abstract [en]

VSC-HVdcs have shown to be effective means to increase margins of stability in transmission systems. An appropriate control strategy and a correct selection of input signals allow VSC-HVdcs to enhance transient stability, damp power oscillations and provide voltage support in a significant way. In this paper the use of local and remote information in control strategies for POD in the control of a VSC-HVdc are studied. Two main control strategies are considered one of them based on linear control and the other one based on nonlinear control. As local signals current through transmission lines and frequency at connecting nodes of the VSC-HVdc are used. Rotor angles and speed of the generators are used as remote signals.

Place, publisher, year, edition, pages
NEW YORK: IEEE , 2009. 793-798 p.
Keyword [en]
Remote Information, POD, Transient Stability, VSC-HVdc
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-31666DOI: 10.1109/PTC.2009.5282037ISI: 000276834600120Scopus ID: 2-s2.0-74949137600ISBN: 978-1-4244-2234-0 (print)OAI: oai:DiVA.org:kth-31666DiVA: diva2:405139
Conference
Bucharest PowerTech Conference, Bucharest, ROMANIA, JUN 28-JUL 02, 2009
Note
QC 20110321Available from: 2011-03-21 Created: 2011-03-21 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.
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, MehrdadSöder, Lennart

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