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Thermal Evaluation of a Medium Frequency Transformer in a Line Sider Conversion System
KTH, School of Electrical Engineering (EES), Electrical Machines and Power Electronics (closed 20110930). KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group.
ABB AB, Sweden .ORCID iD: 0000-0002-8565-4753
KTH, School of Electrical Engineering (EES), Electrical Machines and Power Electronics (closed 20110930).ORCID iD: 0000-0001-7330-146X
KTH, School of Electrical Engineering (EES), Electrical Machines and Power Electronics (closed 20110930).
2009 (English)In: Proceedings of the 13th International European Electronics Conference and Exhibition, EPE '09, IEEE , 2009, 2517-2526 p.Conference paper, Published paper (Refereed)
Abstract [en]

A central part of a medium frequency conversion system is the transformer. A medium frequency transformer for railway propulsion may be stressed beyond 30kV with voltage slopes around 50kV/mu s depending on topology while the geometric dimensions are small. A 170kVA transformer prototype operated at 4 kHz has been developed and tested.

A transient thermal model of the transformer is developed and verified experimentally. The transient thermal behavior is important in propulsion applications where the conversion system is often heavily overloaded. Simulations indicate that the overloading capability of the transformer is comparable to a conventional traction transformer. Experimental results are in good agreement with the model.

Place, publisher, year, edition, pages
IEEE , 2009. 2517-2526 p.
Keyword [en]
Transformer, High frequency power converter, Thermal design, Rail vehicle
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Järnvägsgruppen - Elsystem
Identifiers
URN: urn:nbn:se:kth:diva-10426ISI: 000275384101045Scopus ID: 2-s2.0-72949091735ISBN: 978-1-4244-4432-8 (print)OAI: oai:DiVA.org:kth-10426DiVA: diva2:217111
Conference
2009 13th European Conference on Power Electronics and Applications, EPE '09; Barcelona; 8 September 2009 through 10 September 2009
Note

QC 20110304

Available from: 2009-05-13 Created: 2009-05-13 Last updated: 2014-10-09Bibliographically approved
In thesis
1. On Design of a Compact Primary Switched Conversion System for Electric Railway Propulsion
Open this publication in new window or tab >>On Design of a Compact Primary Switched Conversion System for Electric Railway Propulsion
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

In this thesis, a compact and light primary switched conversion system for AC-fed railway propulsion is investigated. It is characterized by soft switching of all converter stages and a source commutated primary converter comprising series connected valves. Both weight and volume of the conversion system are reduced significantly compared to a conventional system with a low frequency transformer.

The conversion system is made up of N isolated AC/DC conversion cells, each comprising a cycloconverter and a voltage source converter (VSC) coupled by a medium frequency transformer. The cells are series connected on the AC side and connected to a common DC-link. Thus, 2N+1 voltage levels can be synthesized at the AC terminal and the voltage stress on the transformer and line filter is reduced compared to a one cell solution. Series connection of semiconductor valves allows independent choice of blocking voltage and number of converter cells. Choosing two converter cells is an attractive compromise. Five level output reduces the harmonic distortion and simplify transformer and line filter design while keeping the complexity of the conversion system low.

The mutually commutated converter (MCC) allows a transformer frequency in the range of 4 to 8 kHz without derating the line side converter due to zero voltage switching of the VSC. Modern magnetic materials, like high silicon steel, amorphous and noncrystalline materials allow design of the transformer with high efficiency at elevated frequencies.

In a 15 kV system, the peak voltage at the catenary is typically beyond 32 kV which is far beyond the voltage capability of currently available semiconductors. Therefore, several semiconductors are connected in series. Favourable commutation conditions and a new gate drive arrangement allow snubberless commutation of the primary converter stage. Thus, the primary converter can be highly integrated, reducing both weight and volume. The conversion system can be placed on the roof or in the underframe without compromising efficiency or vehicle performance.

The feasibility of the conversion concept has been demonstrated by means of a down-scaled prototype. Snubberless commutation of series connected valves is demonstrated.

Place, publisher, year, edition, pages
Stockholm: KTH, 2009. viii, 75 p.
Series
Trita-EE, ISSN 1653-5146 ; 2009 : 29
Keyword
Isolated AC/DC converter, Mutual commutation, Soft Switching, Cyclo converter, Medium-Frequency Transformer, Electric Railway Propulsion
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-10428 (URN)978-91-7415-327-9 (ISBN)
Public defence
2009-06-05, D3, Lindstedtvägen 5, KTH, Stockholm, 10:00 (English)
Opponent
Supervisors
Note
QC 20100723Available from: 2009-05-18 Created: 2009-05-13 Last updated: 2010-07-23Bibliographically approved

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Norrga, StaffanÖstlund, Stefan

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