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3D High Frequency Modelling of Motor Converter and Cables in Propulsion Systems
KTH, School of Electrical Engineering (EES), Electromagnetic Engineering.
2014 (English)Independent thesis Advanced level (professional degree), 20 credits / 30 HE creditsStudent thesis
Abstract [en]

The use of the power converters in railway traction systems introduces high frequency

electromagnetic interference (EMI) in the propulsion system, which causes

electromagnetic compatibility (EMC) problems. These high frequency phenomena

come from fast variations of current and voltage during the switching operations

in the power converter. The high frequency currents generate Electromagnetic

(EM) disturbances that could distort the smooth functionality of the electrical

drive system. In fact, power and audio frequency emissions could disturb track

signaling and the control systems, while high frequency currents injected into cable

screens could damage the cables. In order to ensure compatibility to conducted

and radiated EMC requirements, and related infrastructure signaling specications,

it is necessary to perform 3D modelling of the drive system to predict the

EM emission during the design phase of the propulsion system. CST, an electromagnetic

analysis tool, is used to create the 3D model of the converter module

and the cables. The model allows for the inclusion of the parasitic characteristics

of the IGBTs, the bus-bars, and the motor cables. Inuence of dierent grounding

schemes is analyzed. The model predicts the EM eld distribution at points inside

the converter module and in the vicinity.

Abstract [sv]

Anvandningen av kraftomvandlare i jarnvagstraktionssystem introducerar hogfrekvens

elektromagnetisk interferens (EMI) i framdrivningssystemet, vilket orsakar

elektromagnetiska kompatibilitetsproblem (EMC). Dessa hogfrekvensfenomen

orsakas av snabba variationer i strom och spanning under omkopplingsoperationer

i kraftomvandlare. Hogfrekvensstrommarna alstrar elektromagnetiska (EM)

storningar, som kan paverka funktionaliteten hos det elektriska drivsystemet.

Storningar vid kraft- och ljudfrekvenser kan paverka signal- och kontrollsystemen,

medan hogfrekventa strommar injiceras i kabelskarmar kan skada kablarna. For

att sakerstalla kompatibiliteten mellan EMC-kraven, vad galler ledningsbundna

och utsanda storningar, och specikationerna for signalsystemets infrastruktur

ar det nodvandigt att utfora 3D-modellering av drivsystemet, for att redan under

designfasen av framdrivningssystemet kunna forutsaga de elektromagnetiska

storningarna. CST, som ar ett elektromagnetiskt analysverktyg, anvands for att

skapa 3D-modellen av omriktarmodulen och kablarna. Modellen gor det mojligt

att ta med de parasitiska egenskaperna hos IGBT, ledningsmoduler och motorkablar.

Inverkan av olika jordningssystemen analyseras. Modellen forutsager det

elektromagnetiska faltet vid olika punkter inuti omriktarmodulen och i dess narhet.

Place, publisher, year, edition, pages
2014. , 62 p.
EES Examensarbete / Master Thesis, XR-EE-ETK 2014:012
National Category
Other Electrical Engineering, Electronic Engineering, Information Engineering
URN: urn:nbn:se:kth:diva-160637OAI: diva2:790654
Educational program
Master of Science in Engineering - Electrical Engineering
Available from: 2015-02-25 Created: 2015-02-25 Last updated: 2015-02-25Bibliographically approved

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