| Abstract |
In a battery electric vehicle (BEV), the traction inverter generates a current ripple overlaying the DC current, supplied by the high voltage battery. The overlaid current ripple increases the RMS and peak value of the DC bus current and may accelerate the aging of the battery. This paper derives and analyzes the current ripple in a driving cycle defined in the Worldwide Harmonized Light Vehicle Test Procedure (WLTP). The simulation model is validated by measurements from an automotive test bench. Different criteria to evaluate the current ripple are presented, compared, and discussed. Driving scenarios which produce a high ripple are detected. Finally, a sweep of switching frequency and DC link capacitance shows effective means to reduce the current ripple over the driving cycle. |
