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Active Snubber Circuit for Source Commutated Converters Utilizing the IGBT in the Linear Region
KTH, School of Electrical Engineering (EES), Electrical Machines and Power Electronics (closed 20110930). KTH, School of Engineering Sciences (SCI), Centres, The KTH Railway Group.
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).ORCID iD: 0000-0002-8565-4753
2008 (English)In: IEEE transactions on power electronics, ISSN 0885-8993, E-ISSN 1941-0107, Vol. 23, no 5, 2595-2601 p.Article in journal (Refereed) Published
Abstract [en]

This paper describes a gate control method where an IGBT is controlled in its linear region by means of closed loop control in order to regulate the voltage slope during turn-on and to clamp the voltage of an anti-parallel diode in a source commutated converter. Controlling the voltage slope may be necessary in a high voltage converter to avoid emission of EMI or to avoid triggering oscillations which may cause insulation failure. Controlling the switching trajectory without influence from the device characteristics is important where series-connection is necessary to increase the overall blocking voltage. The control method has been verified by means of a prototype.

Place, publisher, year, edition, pages
IEEE , 2008. Vol. 23, no 5, 2595-2601 p.
Keyword [en]
Ac-ac power conversion; Electromagnetic interference; Insulated gate bipolar transistors; Snubbers
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
Research subject
Järnvägsgruppen - Elsystem
Identifiers
URN: urn:nbn:se:kth:diva-10425DOI: 10.1109/TPEL.2008.2002093ISI: 000261599700038Scopus ID: 2-s2.0-57349189392OAI: oai:DiVA.org:kth-10425DiVA: diva2:217109
Note

QC 20150624

Available from: 2009-05-13 Created: 2009-05-13 Last updated: 2015-11-11Bibliographically 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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Östlund, StefanNorrga, Staffan

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