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Availability Assessment of the HVDC Converter Transformer System
KTH, School of Electrical Engineering (EES), Electric Power Systems.
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.ORCID iD: 0000-0003-4763-9429
2008 (English)In: Proceedings of the 10th International Conference on Probabilistic Methods Applied to Power Systems, PMAPS 2008, New York: IEEE , 2008, 575-582 p.Conference paper, Published paper (Refereed)
Abstract [en]

This paper presents a reliability assessment of the HVDC converter transformer system (CTS) comparing different component models and configurations. The CTS model is based on the Markov modelling approach, which is shown to be well suited for these relatively small systems. The failure rate data in the models is based on statistical surveys by CIGRE. A number of scenarios are calculated in order to evaluate the impact of the availability of the CTS given different conditions. The result shows on the benefit in availability using a spare transformer, particularly at a close location of the HVDC station.

Place, publisher, year, edition, pages
New York: IEEE , 2008. 575-582 p.
Keyword [en]
Converter Transformer, HVDC transmission, Markov processes, Power transmission reliability
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-25816ISI: 000271680900084Scopus ID: 2-s2.0-70349147917ISBN: 978-193432521-6 (print)OAI: oai:DiVA.org:kth-25816DiVA: diva2:359950
Conference
10th International Conference on Probabilistic Methods Applied to Power Systems, PMAPS 2008; Rincon; 25 May 2008 through 29 May 2008
Note
QC 20101101Available from: 2010-11-01 Created: 2010-11-01 Last updated: 2011-03-01Bibliographically approved
In thesis
1. On Reliability Methods Quantifying Risks to Transfer Capability in Electric Power Transmission Systems
Open this publication in new window or tab >>On Reliability Methods Quantifying Risks to Transfer Capability in Electric Power Transmission Systems
2009 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

In the operation, planning and design of the transmission system it is of greatest concern to quantify the reliability security margin to unwanted conditions. The deterministic N-1 criterion has traditionally provided this security margin to reduce the consequences of severe conditions such as widespread blackouts. However, a deterministic criterion does not include the likelihood of different outage events. Moreover, experience from blackouts shows, e.g. in Sweden-Denmark September 2003, that the outages were not captured by the N-1 criterion. The question addressed in this thesis is how this system security margin can be quantified with probabilistic methods. A quantitative measure provides one valuable input to the decision-making process of selecting e.g. system expansions alternatives and maintenance actions in the planning and design phases. It is also beneficial for the operators in the control room to assess the associated security margin of existing and future network conditions.

This thesis presents a method that assesses each component's risk to an insufficient transfer capability in the transmission system. This shows on each component's importance to the system security margin. It provides a systematic analysis and ranking of outage events' risk of overloading critical transfer sections (CTS) in the system. The severity of each critical event is quantified in a risk index based on the likelihood of the event and the consequence of the section's transmission capacity. This enables a comparison of the risk of a frequent outage event with small CTS consequences, with a rare event with large consequences.

The developed approach has been applied for the generally known Roy Billinton Test System (RBTS). The result shows that the ranking of the components is highly dependent on the substation modelling and the studied system load level.

With the restriction of only evaluating the risks to the transfer capability in a few CTSs, the method provides a quantitative ranking of the potential risks to the system security margin at different load levels. Consequently, the developed reliability based approach provides information which could improve the deterministic criterion for transmission system planning.

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. 85 p.
Series
Trita-EE, ISSN 1653-5146 ; 2009:015
Keyword
Power transmission reliability, power system security, reliability modeling, risk analysis for power systems, power system planning
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-10258 (URN)978-91-7415-270-8 (ISBN)
Presentation
2009-05-15, H1, Teknikringen 33, Stockholm, 10:00 (Swedish)
Opponent
Supervisors
Available from: 2009-05-06 Created: 2009-04-24 Last updated: 2010-11-01Bibliographically approved

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Bertling, Lina

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