3D High Frequency Modelling of Motor Converter and Cables in Propulsion Systems

University essay from KTH/Elektroteknisk teori och konstruktion

Author: Njiomouo Stephane Yannick; [2014]

Keywords: ;


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.

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