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Design of power supply system in DC electrified transit railways - Influence of the high voltage network
KTH, School of Electrical Engineering (EES), Electrical Energy Conversion.
2014 (English)Independent thesis Advanced level (degree of Master (Two Years)), 20 credits / 30 HE creditsStudent thesisAlternative title
Dimensionering av likspänningsbanmatningssystem – Inverkan av högspänningsnätet (Swedish)
Abstract [en]

Urban rail systems such as subways and trams transport millions of people every day, oering

a high level of service. Most of these systems are fed by direct current (DC). The design of the

power supply network of DC electried transit railways is of great importance and requires the

use of simulation models. The power supply network is composed of a high voltage network (fed

with AC) linked to a traction network (fed with DC) by traction substations. Many simulation

models ignore the high voltage network in the design process whereas it has a signicant inuence

on the results.

A Newton-Raphson algorithm is implemented to solve the AC load ow in the high voltage

network, and coupled to the existing simulation software Symphonie.

Three dierent high voltage network architectures are simulated, and the simulation results are

analyzed. The results show that the voltage drop at the AC side of traction substations and the

load sharing between them varies signicantly from one architecture to another. In particular,

when several traction substations are connected to the same high voltage loop, voltage drops can

be signicant for some traction substations.

In conclusion, the design of the power supply network of DC electried transit railways requires

the simulation of the high voltage network when several substations are connected to the same

high voltage loop.

Abstract [sv]

Publika sparburna transportsystem sasom tunnelbanor och lokalbanor transporterar miljontals

manniskor varje dag. De esta korta linjer matas med likstrom. Utformningen av stromforsorjningen

till dessa system ar avgorande for ett val fungerande , och forutsatter anvandningen av olika matematiska

modeller. Detta natverk bestar av ett vaxelstroms hogspanningsnat som omformas till

likstrom i era banmatningsstationer langs banan. Dessa matematiska modeller ignorerar dock

ofta hogspanningsdelen i modelleringen, varfor resultatet ibland kan bli missvisande.

I detta arbete har en belastningsfordelningsalgoritm baserad pa Newton-Raphsons metod implementerats

for att skapa en battre modellering av hsgspanningsdelen i den bentliga programvaran

Symphonie.

Tre olika hogspanningsstrukturer har bearbetats och resultatet visar att spanningsfall och belastningsf

ordelning varierar mellan de olika strukturerna. Speciellt nar era transformatorstationer

ar kopplade till samma hogspanningssystem, kan spanningsfall vara patagligt for vissa transformatorstationer.

Sammanfattningsvis maste utformningen av hogspanningsystemet till likstromsforsorjda jarnvagar

utformas med hjalp av anpassade matematiska modeller som tar hansyn till placering av transformatorstationer

liksom hogspanningsnatets kapacitet.

Place, publisher, year, edition, pages
2014. , 68 p.
Series
EES Examensarbete / Master Thesis, XR-EE-E2C 2014:007
Keyword [en]
railway simulation, electric traction, AC/DC load flow, high voltage network
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
URN: urn:nbn:se:kth:diva-153924OAI: oai:DiVA.org:kth-153924DiVA: diva2:753972
External cooperation
Setec its
Educational program
Master of Science in Engineering - Urban Management; Degree of Master - Transport Systems
Examiners
Available from: 2014-10-09 Created: 2014-10-09 Last updated: 2014-10-09Bibliographically approved

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