Modeling of Electric vehicle High Voltage Power Systems Using CISPR-25 CE Measurement Data

Author: Badri Khvitia
Co-authors: Z. Kutchadze, A. Gheonjian,R. Jobava
Keywords: Electric vehicle, modeling, high voltage power system, inverter
Annotation:

Proposes a methodology that significantly reduces the time of preliminary prediction of EMI/EMC (Electromagnetic Interference, Electromagnetic Compatibility) problems and greatly simplifies the work of creating the research system itself. It is shown how accurate the model can be built using the results of measurements carried out by the CISPR-25 CE standard. Inverter, filter, DC-link capacitor, and cable models are discussed, highlighting the key parameters that impact final results. Since the filter effectively conceals the noise generator impedance, we believe that accurate modeling of the filter is sufficient to accurately determine the device's impedance. The methodology presented in the article shows that if we know (from CISPR-25 CE measurements and additional general information) the PWM fundamental frequency and other parameters (specified in the article), we can reconstruct the filter model with high accuracy. On the example of a specific inverter, it is shown that using the filter model created by this method, we get a fairly good comparison between the measured and modeled signals on the LISN output. This inverter model can be incorporated into whole vehicle modeling to identify parasitic resonances and select optimal cable layouts.