Ändra sökning
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf
Fast Estimation of Relations Between Aggregated Train Power System Data and Traffic Performance
KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.ORCID-id: 0000-0003-2109-060X
KTH, Skolan för elektro- och systemteknik (EES), Elektriska energisystem.ORCID-id: 0000-0002-8189-2420
2011 (Engelska)Ingår i: IEEE Transactions on Vehicular Technology, ISSN 0018-9545, E-ISSN 1939-9359, Vol. 60, nr 1, s. 16-29Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

Transports via rail are increasing, and major railway infrastructure investments are expected. An important part of this infrastructure is the railway power supply system (RPSS). Future railway power demands are not known. The more distant the uncertain future, the greater the number of scenarios that have to be considered. Large numbers of scenarios make time-demanding (some minutes, each) full simulations of electric railway power systems less attractive and simplifications more so. The aim, and main contribution, of this paper is to propose a fast approximator that uses aggregated traction system information as inputs and outputs. This approximator can be used as an investment planning constraint in the optimization. It considers that there is a limit on the intensity of the train traffic, depending on the strength of the power system. This approximator approach has not previously been encountered in the literature. In the numerical example of this paper, the approximator inputs are the power system configuration; the distance between a connection from contact line to the public grid, to another connection, or to the end of the contact line; the average values and the standard deviations of the inclinations of the railway; the average number of trains; and their average velocity for that distance. The output is the maximal attainable average velocity of an added train for the described railway power system section. The approximator facilitates studies of many future railway power system loading scenarios, combined with different power system configurations, for investment planning analysis. The approximator is based on neural networks. An additional value of the approximator is that it provides an understanding of the relations between power system configuration and train traffic performance.

Ort, förlag, år, upplaga, sidor
IEEE conference proceedings, 2011. Vol. 60, nr 1, s. 16-29
Nyckelord [en]
Load flow, neural networks, railway
Nationell ämneskategori
Annan elektroteknik och elektronik
Identifikatorer
URN: urn:nbn:se:kth:diva-30549DOI: 10.1109/TVT.2010.2091293ISI: 000286385700003Scopus ID: 2-s2.0-78751660527OAI: oai:DiVA.org:kth-30549DiVA, id: diva2:401542
Anmärkning
© 2011 IEEE. Personal use of this material is permitted. Permission from IEEE must be obtained for all other uses, in any current or future media, including reprinting/republishing this material for advertising or promotional purposes, creating new collective works, for resale or redistribution to servers or lists, or reuse of any copyrighted component of this work in other works. QC 20110303Tillgänglig från: 2012-01-17 Skapad: 2011-02-28 Senast uppdaterad: 2017-12-11Bibliografiskt granskad
Ingår i avhandling
1. Optimal Railroad Power Supply System Operation and Design: Detailed system studies, and aggregated investment models
Öppna denna publikation i ny flik eller fönster >>Optimal Railroad Power Supply System Operation and Design: Detailed system studies, and aggregated investment models
2012 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

Railway power supply systems (RPSSs) differ mainly from public power systems from that the loads are moving. These moving loads are motoring trains. Trains can also be regenerating when braking and are then power sources. These loads consume comparatively much power, causing substantial voltage drops, not rarely so big that the loads are reduced. By practical reasons most RPSSs are single-phase AC or DC. Three-phase public grid power is either converted into single-phase for feeding the railway or the RPSS is compartmentalized into separate sections fed individually from alternating phase-pairs of the public grid. The latter is done in order not to overload any public grid phase unnecessarily much.

This thesis summarizes various ways of optimally operating or designing the railway power supply system. The thesis focuses on converter-fed railways for the reasons that they are more controllable, and also has a higher potential for the future. This is also motivated in a literature-reviewing based paper arguing for the converter usage potential. Moreover, converters of some kind have to be used when the RPSS uses DC or different AC frequency than the public grid.

The optimal operation part of this thesis is mainly about the optimal power flow controls and unit commitments of railway converter stations in HVDC-fed RPSSs. The models are easily generalized to different feeding, and they cope with regenerative braking. This part considers MINLP (mixed integer nonlinear programming) problems, and the main part of the problem is non-convex nonlinear. The concept is presented in one paper. The subject of how to model the problem formulations have been treated fully in one paper.

The thesis also includes a conference article and a manuscript for an idea including the entire electric train driving strategy in an optimization problem considering power system and mechanical couplings over time. The latter concept is a generalized TPSS (Train Power Systems Simulator), aiming for more detailed studies, whereas TPSS is mainly for dimensioning studies. The above optimal power flow models may be implemented in the entire electric train driving strategy model.

The optimal design part of this thesis includes two aggregation models for describing reduction in train traffic performance. The first one presented in a journal, and the second one, adapted more useful with different simulation results was presented at a conference. It also includes an early model for optimal railway power converter placements.

The conclusions to be made are that the potential for energy savings by better operation of the railway power system is great. Another conclusion is that investment planning models for railway power systems have a high development potential. RPSS planning models are computationally more attractive, when aggregating power system and train traffic details.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2012. s. xii, 77
Serie
Trita-EE, ISSN 1653-5146 ; 2012:062
Nationell ämneskategori
Annan elektroteknik och elektronik
Identifikatorer
urn:nbn:se:kth:diva-107037 (URN)978-91-7501-584-2 (ISBN)
Disputation
2012-12-17, sal Q2, Osquldasväg 10, KTH, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning

QC 20121206

Tillgänglig från: 2012-12-06 Skapad: 2012-12-05 Senast uppdaterad: 2013-02-25Bibliografiskt granskad

Open Access i DiVA

fulltext(320 kB)889 nedladdningar
Filinformation
Filnamn FULLTEXT01.pdfFilstorlek 320 kBChecksumma SHA-512
058024cc9173223c6168384293d10316eb0eb9197e35e0babc4f3678fbfbd5ad6503a375a07624fe60a1290b8868bc792214ec1f4956449bd90076ebe81b1410
Typ fulltextMimetyp application/pdf

Övriga länkar

Förlagets fulltextScopusIEEEXplore

Personposter BETA

Abrahamsson, LarsSöder, Lennart

Sök vidare i DiVA

Av författaren/redaktören
Abrahamsson, LarsSöder, Lennart
Av organisationen
Elektriska energisystem
I samma tidskrift
IEEE Transactions on Vehicular Technology
Annan elektroteknik och elektronik

Sök vidare utanför DiVA

GoogleGoogle Scholar
Totalt: 889 nedladdningar
Antalet nedladdningar är summan av nedladdningar för alla fulltexter. Det kan inkludera t.ex tidigare versioner som nu inte längre är tillgängliga.

doi
urn-nbn

Altmetricpoäng

doi
urn-nbn
Totalt: 1241 träffar
RefereraExporteraLänk till posten
Permanent länk

Direktlänk
Referera
Referensformat
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Annat format
Fler format
Språk
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Annat språk
Fler språk
Utmatningsformat
  • html
  • text
  • asciidoc
  • rtf