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Electromagnetic noise generated in the electrified railway propulsion system
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering. (Division of Electromagnetic Engineering)
2011 (English)Licentiate thesis, comprehensive summary (Other academic)
Abstract [en]

The electromagnetic compatibility (EMC) problem in the railway propulsion system is a significant safety issue of high concern. The problems can be caused by any part of the propulsion system as well as any combination of the sub systems. Simulation is a fast economical way to understand the system and to predict the EMC performance. In this thesis, the propulsion system is studied partly from the rectifier to the motor. To simulate the rectifier, a two level pulse width modulation (PWM) controlled rectifier is built in Simulink. Time domain line current as well as frequency domain spectra is studied. The spectrum changing according to time variation is obtained. In order to study the high derivative of switching pulse in the insulated gate bipolar transistor (IGBT), a simple circuit is proposed to investigate it. The high frequency noise spectrum is given and the variation of the spectrum due to the reverse recovery time of the ant-parallel diode is also demonstrated.

Transmission line theory is used to model the cable used to connect the inverter and motor. The method to extract the characteristic capacitance and inductance matrices of the cable system is presented. Decoupling these characteristic matrices is required for modeling the multiconductor transmission line (MTL) in PSpice. A simple way to decouple them is thus proposed here. Through the simulation studies, we analyze the oscillation and overvoltage in the cable. A fourth cable with optimized layout is also illustrated here to reduce the oscillation on the line. Furthermore, the relationship between the length of line and the noise frequency is studied.

Shielding is another way to reduce the electromagnetic (EM) coupling of power lines. The method to model shielded cables in PSpice is given in this thesis. Based on the model we have investigated the shielding effect and analyzed the impact of different grounding conditions on the shielding performance.

Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology , 2011. , 50 p.
Series
Trita-EE, ISSN 1653-5146 ; 2011:011
Keyword [en]
Electromagnetic compatibility, railway, propulsion system, shielded cable, transmission line
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering Telecommunications
Research subject
SRA - Transport
Identifiers
URN: urn:nbn:se:kth:diva-31581ISBN: 978-91-7415-873-1OAI: oai:DiVA.org:kth-31581DiVA: diva2:404891
Presentation
2011-03-28, V3, KTH, Teknikringen 72, Stockholm, 10:00 (English)
Opponent
Supervisors
Funder
TrenOp, Transport Research Environment with Novel Perspectives
Note
QC 20110321Available from: 2011-03-21 Created: 2011-03-18 Last updated: 2011-03-21Bibliographically approved
List of papers
1. PSpice Modeling of Electrified Railway Propulsion Drive Rectifiers for Harmonic Analysis
Open this publication in new window or tab >>PSpice Modeling of Electrified Railway Propulsion Drive Rectifiers for Harmonic Analysis
2009 (English)In: ITST: 2009 9TH INTERNATIONAL CONFERENCE ON INTELLIGENT TRANSPORT SYSTEMS TELECOMMUNICATIONS, New York: IEEE , 2009, 113-116 p.Conference paper (Refereed)
Abstract [en]

A method to construct the electrified railway propulsion drive rectifier in PSpice for EMC assessment is developed. The working mechanisms of a three level NPC PWM rectifier and its logical signal generator are elaborated. Besides that, the convergence problem of PSpice is explained and the proper parametric settings for simulation in this paper are given. At last, the noise spectra for two different loads are compared and the causes for this difference are discussed as well.

Place, publisher, year, edition, pages
New York: IEEE, 2009
Keyword
three level PWM rectifier, PSpice, Propulsion drive, harmonic analysis
National Category
Telecommunications Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-29681 (URN)000279343400021 ()2-s2.0-77950490954 (ScopusID)
Conference
9th International Conference on Intelligent Transport Systems Telecommunications
Note
QC 20110218Available from: 2011-02-18 Created: 2011-02-11 Last updated: 2012-06-04Bibliographically approved
2. EMC assessment of the railway traction system by using PSpice
Open this publication in new window or tab >>EMC assessment of the railway traction system by using PSpice
2010 (English)In: 2010 Asia-Pacific Symposium on Electromagnetic Compatibility, APEMC 2010, 2010, 598-601 p.Conference paper (Refereed)
Abstract [en]

This paper describes how to analyze the EMC performance of the railway traction system by using PSpice. This analysis method is based on the accurate modelling of the IGBT and power diodes. The paper gives the analysis method as well as the modelling details of these power devices. An efficient way to predict the worst EMC performance is proposed, especially for high frequency EM noise. We have also studied the impact of the reverse-recovery time of a free wheeling diode on high frequency EM noise generation. © 2010 IEEE.

Keyword
Analysis method, EMC performance, Freewheeling diodes, High frequency, Noise generation, Power devices, Power diode, Railway traction, Recovery time, Electromagnetic compatibility, Electromagnetism, Traction (friction), Railroads
National Category
Telecommunications Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-31661 (URN)10.1109/APEMC.2010.5475886 (DOI)2-s2.0-77954966395 (ScopusID)9781424456215 (ISBN)
Note
QC 20110321Available from: 2011-03-21 Created: 2011-03-21 Last updated: 2011-03-21Bibliographically approved
3. Optimal cable assembly for reducing conducted electromagnetic interference in the traction system
Open this publication in new window or tab >>Optimal cable assembly for reducing conducted electromagnetic interference in the traction system
2012 (English)In: IET Electrical Systems in Transportation, ISSN 2042-9738, Vol. 2, no 1, 29-37 p.Article in journal (Refereed) Published
Abstract [en]

The present work deals with a method of modelling a traction system in PSpice with the consideration for optimal cable arrangements for reducing conducted electromagnetic interference. Multiconductor transmission line (MTL) theory is adopted to model the cable which connects the pulse-width modulation (PWM) source inverter and the motor. A simple decoupling transformation method is proposed and used to transform the MTL into several single transmission line, which can be easily modelled in PSpice. The PWM controlled voltage source and induction motor are also included in this model. Thus, the full model for a traction system is realised in PSpice. From system simulation, the voltage oscillation in the cable is observed and the conducted electromagnetic noise in the system is studied. The relationship between the frequency of the noise and the length of feeding cables are also demonstrated in this work. In order to mitigate the high-frequency noise, a cable system with a fourth parallel earth conductor is proposed and the noise level is indeed reduced by this technique. This modelling procedure for traction system can be used for any specific application like the electrified railway traction system.

National Category
Telecommunications Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-31663 (URN)10.1049/iet-est.2011.0024 (DOI)2-s2.0-84857338457 (ScopusID)
Funder
StandUp
Note

QC 20110321

Updated from submitted to published, 20120315. Previous title: Optimal cable assembly for reducing conducted electromagnetic

Available from: 2011-03-21 Created: 2011-03-21 Last updated: 2016-04-21Bibliographically approved
4. Modeling the traction system in PSpice for electromagnetic noise analysis
Open this publication in new window or tab >>Modeling the traction system in PSpice for electromagnetic noise analysis
2011 (English)Conference paper (Other academic)
Keyword
multiconductor transmission line, traction system, PWM, electromagnetic noise
National Category
Telecommunications Other Electrical Engineering, Electronic Engineering, Information Engineering
Identifiers
urn:nbn:se:kth:diva-31664 (URN)
Conference
Electronic Environment
Funder
StandUp
Note

QC 20120316

Available from: 2011-03-21 Created: 2011-03-21 Last updated: 2016-06-22Bibliographically approved

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