Measurement and Simulation of Common-Mode Current for an Electric Vehicle Fast Charger

Measurements and simulations of common-mode (CM) current in a commercial ABB TERRA 54CJ 50 kW electric vehicle fast charger are presented. Three-phase and neutral currents were measured using a Chauvin-Arnoux C.A 8336 power analyzer equipped with four MN93A current probes while charging a Hyundai Kona electric vehicle at approximately 50.5 kW. A reconstructed CM current was derived from the measured phase and neutral currents and analyzed in both the time and frequency domains. Fast Fourier Transform analysis showed that the dominant spectral component occurs at 50 Hz, with significant components below 2.5 kHz. An improved frequency-domain behavioral model was implemented in ADS using all measured harmonics. Comparison with measurements showed improved agreement relative to the previously published model, reducing average waveform errors for all phase currents and the neutral current. The results demonstrate the applicability of the proposed model for studying low-frequency common-mode current behavior in EV fast chargers and for supporting future EMC-related investigations.