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Modeling and Control of VSC-HVDC Transmissions
KTH, School of Electrical Engineering (EES), Electric Power Systems.
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 [en]
Control Lyapunov Functions, Energy Function, Modal Analysis, Transient Stability, Voltage Stability, VSC-HVDC Transmission.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:kth:diva-32313ISBN: 978-91-7415-924-0OAI: oai:DiVA.org:kth-32313DiVA: diva2:409908
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
List of papers
1. Control of a VSC-HVDC operating in Parallel with AC Transmission Lines
Open this publication in new window or tab >>Control of a VSC-HVDC operating in Parallel with AC Transmission Lines
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.

Keyword
Ddamping of power oscillations, load flow control, transient stability, voltage control, VSC-HVdc
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-32305 (URN)10.1109/TDCLA.2006.311394 (DOI)000246244800168 ()2-s2.0-82955169519 (ScopusID)978-1-4244-0287-8 (ISBN)
Conference
IEEE PES T&D C&E
Note
QC 20110411Available from: 2011-04-11 Created: 2011-04-11 Last updated: 2011-04-12Bibliographically approved
2. Active and reactive power control of a VSC-HVdc
Open this publication in new window or tab >>Active and reactive power control of a VSC-HVdc
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.

Keyword
control Lyapunov functions, modal analysis, power oscillations damping, transient stability, voltage support, VSC-HVdc
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-17820 (URN)10.1016/j.epsr.2008.03.003 (DOI)000259161800013 ()2-s2.0-45449091726 (ScopusID)
Note
QC 20100525Available from: 2010-08-05 Created: 2010-08-05 Last updated: 2011-04-12Bibliographically approved
3. Use of Local and Remote Information in POD Control of a VSC-HVdc
Open this publication in new window or tab >>Use of Local and Remote Information in POD Control of a VSC-HVdc
2009 (English)In: 2009 IEEE BUCHAREST POWERTECH / [ed] Toma L; Otomega B, NEW YORK: IEEE , 2009, 793-798 p.Conference 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
Keyword
Remote Information, POD, Transient Stability, VSC-HVdc
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-31666 (URN)10.1109/PTC.2009.5282037 (DOI)000276834600120 ()2-s2.0-74949137600 (ScopusID)978-1-4244-2234-0 (ISBN)
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
4. Improvement of Power System Stability by Using a VSC-HVdc
Open this publication in new window or tab >>Improvement of Power System Stability by Using a VSC-HVdc
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.

Keyword
CLF, Power oscillation damping, Small signal analysis, Voltage stability, VSC-HVdc
National Category
Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-32310 (URN)10.1016/j.ijepes.2010.08.030 (DOI)000289500700020 ()2-s2.0-78650901414 (ScopusID)
Note
QC 20110411Available from: 2011-04-11 Created: 2011-04-11 Last updated: 2012-08-22Bibliographically approved
5. Operation of Doubly Fed Induction Generators in Power Systems with VSC-HVDC Transmission
Open this publication in new window or tab >>Operation of Doubly Fed Induction Generators in Power Systems with VSC-HVDC Transmission
2010 (English)In: AC and DC Power Transmission, 2010. ACDC, 2010, 1-6 p.Conference paper (Refereed)
Abstract [en]

In this article we investigate the interaction of a wind park comprising doubly fed induction generators and a VSC-HVDC link in a test power system. We look at the combined impact of the components on power oscillation damping and voltage support.

Keyword
DFIG, Doubly fed induction generator, VSCHVDC, coordination, power oscillation damping, voltage support
National Category
Engineering and Technology
Identifiers
urn:nbn:se:kth:diva-32308 (URN)10.1049/cp.2010.1009 (DOI)2-s2.0-79952678419 (ScopusID)
Conference
International Conference on AC and DC Power Transmission
Note
QC 20110411Available from: 2011-04-11 Created: 2011-04-11 Last updated: 2011-04-12Bibliographically approved

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