Abstract
Taking a series-parallel combined hybrid city bus as the prototype, the synergic electric power supply system (SEPS system) consisted of Ni-Mh battery pack and ultra-capacitor(UC)pack was designed to replace the original single electric power source which was battery pack. The element parameters were determined. By secondary development of ADVISOR, the simulation model and control strategy of the SEPS system and then the vehicle simulation model were built. Then the paper combined the ADVISOR with genetic algorithm to find the best capacity values of the battery pack and UC pack. The simulation results show that the vehicle with SEPS system can reduce the charge-discharge current of the battery pack, recapture more energy when braking which means better safety and fuel economy for the vehicle.
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