Research on Electromagnetic Interference in the Energy Dynamic Processes of Power Battery in Electric Vehicles

Electromagnetic interference (EMI) of electric vehicles will affect the sensitive devices, health of the passengers and power quality of the grid. In order to get interference characteristics in the energy dynamic processes, pulse width modulation (PWM) inverter and on-board charger are studied for interference source feature analysis. Then, the power battery is modeled as the main energy storage equipment and interference propagation paths in electric vehicles; the parameters of the model are identified through tests and measurements. Furthermore, the model is verified from two aspects: energy changing dynamic response and frequency features. Finally, interference characteristics are obtained from differential mode (DM) and common mode (CM) current analysis based on simulations and experiments.