Modeling and Analysis of Conducted EMI in a Simulated Electric Vehicle Powertrain

Department of Electrical and Electronics Engineering, S A Engineering College, Chennai, India

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Abstract

This study describes an extensive simulation-based investigation of the conducted electromagnetic interference (EMI) using a complete EV powertrain system. The aim is to identify the EMI characteristics of the vehicle so that its reliability can be improved, and its compliance with automotive electromagnetic standards can be guaranteed. A highly accurate model of a 53kWh lithium-ion battery pack is created with the help of the MATLAB Simscape Battery Builder, and nominal voltage of about 400V is delivered to the system as realistic power source. The system being analyzed consists of a 150kW three-phase traction inverter, which is controlling a Permanent Magnet Synchronous Motor (PMSM), along with an auxiliary 400V–12V buck converter for low-voltage support. There is a Line Impedance Stabilization Network (LISN), which has been designed according to the CISPR25 standard, for the purpose of measuring conducted noise that is propagating toward the battery. The research uses EMI profile of the powertrain without filters and divides the signals into Common-Mode (CM) and Differential-Mode (DM) components for frequency-domain analysis. The results highlight dominant noise generation mechanisms and spectral characteristics of the unfiltered system, providing a strong foundation for future EMI filter design and optimization.