Transient Analysis in Complex Automotive High Voltage Systems

Electrical transients are present in the high-voltage (HV) supply systems of battery electric vehicles (BEV), which is an integrated LVDC power system. In these systems, transients challenge the vehicle developer, in terms of their impact on the protection, measurement and the communication systems. A transient occurs while connecting a vehicle to the infrastructure at the beginning of a charging procedure. In this paper, a summary of the effects of voltage and current transients on the automotive HV supply systems is shown. A detailed system level modelling approach is provided to examine the electric transients on automotive HV-systems. The critical design and integration challenges are analysed with respect to reliable and stable operation. Furthermore, the relevant electrical characteristics on device and system level are evaluated to guarantee the safe and stable operation of the automotive HV supply systems. Validation is conducted on MATLAB/Simulink/Simscape models and on prototype vehicles.