Simulation of a High Voltage System in a Hybrid Electrical Vehicle

Fig. 16. Results of a short circuit fault to the DC-link.
Fig. 17. Contactor fault during battery charging.
Fig. 18. Error current after HV-AC insulation fault.
III. CONCLUSIONS
This paper presents a combined method for the
simulation of the dynamic behavior of electric voltages
and currents in vehicle electrical systems during
operation. The system topology is characterized.
Component modeling by using electric equivalent
circuits and transfer functions is discussed. The use of
the circuit simulator PLECS is proposed to combine
power electronic circuits with the simulation
environment used. By this procedure, advantages of
both software systems can be used. Various operating
conditions and the implication on the vehicle electrical
system can be simulated. The simulation results
presented in this paper show deviations from the
regular operation. Transient voltages, high short circuit
320
currents or error currents resulting from insulation
faults are simulated in this way. Other critical fault
scenarios as load dumps can be analyzed as well. This
fault situations are used for reliability and safety issues.
The model can be parameterized for various vehicle
electrical systems.
Another related research field is the simulation of
lightning arcs. Due to the high voltages above the
standard 12V system, lightning arcs occur after
connection faults in the HV-system. Modeling
techniques and the interaction with the simulation are
under investigation and will be presented in following
works.
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