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Västerås, Sweden

Behmann U.,Otto Hahn Str. 7 | Schutte T.,Atkins Sverige AB
eb - Elektrische Bahnen | Year: 2012

The advantageous use of static converters for 50 Hz traction power supply, which is technically, operationally and economically undisputable, appears to be attractive also under fi nancial aspects. First concrete applications are offered by the newly structured Trans European Transport Network in which several thousand kilometres of railway track are planned to be upgraded or newly built by 2030.

Martinsen F.,Jernbaneverket BTPE | Nordgard M.,KAntech AS | Schutte T.,Atkins Sverige AB
eb - Elektrische Bahnen | Year: 2010

The feeding system of the electrified railways in Norway is challenged by increased power consumption due to more traffic and new trains and locomotives with higher power. To meet these requirements without new feeding stations, the autotransformer system is an attractive solution. The conditions in Scandinavia are special with very low ground conductivity creating electromagnetic compatibility problems and with long distances between feeding stations. To cope with these tasks, an autotransformer system is presented which comprises positive and negative feeder and a contact line divided into short unconnected sections fed by the positive feeder. This solution has low electromagnetic interference levels and allows bypassing sections where the contact line is not energized.

Abrahamsson L.,KTH Royal Institute of Technology | Schutte T.,Atkins Sverige AB | Ostlund S.,KTH Royal Institute of Technology
Energy for Sustainable Development | Year: 2012

Railways are the most energy-efficient land-based mode of transport, and electrification is the most energy-efficient way to power the trains. There are many existing solutions to supply the trains with electricity. Regardless of which particular technology is chosen, it is beneficial to interconnect the public power grids to grids supplying power to the railways. This paper shows that the most efficient, flexible, and gentle-for-the-public-grid way of doing that is through power electronic-based power converters. Converters offer great benefits regardless of whether the overhead contact lines are of DC-type or AC type, and regardless of the AC grid frequency. This paper presents neither new theory nor new experimental results. Based on already available information, this paper presents logical arguments leading to this conclusion from collected facts. Over time what used to be advanced and high-cost equipment earlier can nowadays be purchased at reasonable cost. It is obvious that for most electrically-fed railways, the use of modern power converters is attractive. Where the individual trains are high consumers of energy, the railway gradients are substantial, and the public grids feeding the railway are weak, the use of converters would be technically desirable, if not necessary for electrification.It is expected that more high-speed railways will be built, and more existing railways will be electrified in the foreseeable future. This paper could provide some insights to infrastructure owners and decision makers in railway administrations about value additions that converter-fed electric railways would provide. © 2012 International Energy Initiative.

Behmann U.,Otto Hahn Str. 7 | Schutte T.,Atkins Sverige AB
eb - Elektrische Bahnen | Year: 2012

Nowadays, powerful DC trains run in interconnected overhead line contact systems. Converting them to AC operation in the conventional way, i.e. using phase-changing substations or even transformers, means new disadvantages to both the trains and the 3AC operators. Among these disad-vantages are power peaks that occur when catching up on speed losses after idling runs in phase separation sections. Static converters now again permit an interconnection of the line systems which allows a conversion to be re-assessed.

Abrahamsson L.,KTH Royal Institute of Technology | ostlund S.,KTH Royal Institute of Technology | Schutte T.,Atkins Sverige AB | Soder L.,KTH Royal Institute of Technology
Transportation Research Part C: Emerging Technologies | Year: 2013

This paper presents an optimization model for simulations of railway power supply systems. It includes detailed power systems modeling, train movements in discretized time considering running resistance and other mechanical constraints, and the voltage-drop-induced reduction of possible train tractive forces. The model has a fixed number of stationary power system nodes, which alleviates optimized operation over time. The proposed model uses SOS2 (Special Ordered Sets of type 2) variables to distribute the train loads to the two most adjacent power system nodes available.The impacts of the number of power system nodes along the contact line and the discretized time step length on model accuracy and computation times are investigated.The program is implemented in GAMS. Experiences from various solver choices are also discussed. The train traveling times are minimized in the example. Other studies could e.g. consider energy consumption minimization. The numerical example is representative for a Swedish decentralized, rotary-converter fed railway power supply system. The proposed concept is however generalizable and could be applied for all kinds of moving load power system studies. © 2013 Elsevier Ltd.

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