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Modellering och analys av hjälpkraftsystemet i järnvägsnätet
KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
KTH, School of Technology and Health (STH), Medical Engineering, Computer and Electronic Engineering.
2016 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesisAlternative title
Modulation and analysis of auxiliary power in the railway system (English)
Abstract [sv]

I denna rapport utreds problem med spänningsfall i hjälpkraften på olika sträckor i Sverige. Hjälpkraften förser el, tele och signalsystemen med ström. Spänningsnivån kan vara 22 kV trefas eller 11 kV tre eller tvåfassystem. Rapportens utgångspunkt är STRI’s utredning om hjälpkraft där en schablonmetod har framställts. Den metoden har jämförts med simuleringsresultat ur µPAS. De sträckor som rapporten omfattar är trefas med den nominella spänningen 11 kV, 50 Hz.

Sträckorna har modellerats och simulerats i µPAS. Vidare har enkla analytiska metoder används, där hela lasten antogs ligga  i slutet på linjen. Resultaten från den analytiska modellen har sedan jämförts med de simulerade. Utifrån detta har två alternativa lösningar tagits fram: att höja den nominala spänningen till 22 kV eller ändra placeringen på inmatningspunkterna vid långmatning. För ett indikativt resultat kunde schablonmetoden användas, för en mer precis undersökning var  µPAS ett bättre alternativ.

Slutsatsen är att alla undersökta och normalmatade sträckor för 11 kV klarar spänningskraven på ± 10 % av nominalspänning. Problem uppkommer vid långmatning och då 11 kV inte upprätthålls från omformarstation.

Abstract [en]

This report will investigate troubles with voltage drop in the auxiliary power system on different routes in the Swedish railway. The auxiliary power system provides the electrical, telecom and signalling systems with power. The voltage level can be 22 kV three phase or 11 kV three or two phase. The report is based on an investigation from STRI where a standardised approach has been developed. The routes included in the report are three phase and has the rated voltage of 11 kV, 50 Hz.

The routes have been modulated and simulated in µPAS. To verify the results from the simulations calculations have been made separately. From the results two alternative solutions has been presented. Raise the voltage to 22 kV or change the position of the feeder for long feed. The aim was to lower the voltage drop for each of the solutions. For a quick control the standardised approach can be used. To get more accurate values µPAS is the better alternative.  

One conclusion was that all examined routes with 11 kV and are normal fed fulfil the demands of ± 10 % of rated voltage. Issues appear when a route is long fed and if the voltage from a frequency converter drops below 11 kV. 

Place, publisher, year, edition, pages
2016. , 52 p.
Series
TRITA-STH, 2016:41
Keyword [en]
Auxiliary power, µPAS, Baninformationssystemet, long feed, normal feed
Keyword [sv]
Hjälpkraft, µPAS, Baninformationssystemet, långmatning, normalmatning
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-188502OAI: oai:DiVA.org:kth-188502DiVA: diva2:935524
External cooperation
Trafikverket
Subject / course
Electrical Engineering
Educational program
Bachelor of Science in Engineering - Electrical Engineering
Supervisors
Examiners
Available from: 2016-10-21 Created: 2016-06-10 Last updated: 2016-10-21Bibliographically approved

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