Study on Optimal Hybrid Ratio Parameters of Hybrid Fuel Cell System

Abstract

With the parameters of a bus as the prototype and fuel cells and rechargeable batteries as the hybrid power, parameters of the bus motor, the fuel motor and the rechargeable battery were calculated and matched on consideration of the characteristics of fuel cells and rechargeable batteries as well as power demands under different working conditions, such as start, acceleration, climbing and braking. On guaranteeing definite total power of the bus, it was calculated that the optimal hybrid ratio of fuel cells and rechargeable batteries was 0.4, that is, the power of the fuel cell was about 50kw while that of the lithium battery was 70kw when the efficiency of the bus was the optimal.