机车用质子交换膜燃料电池系统过氧比区域建模

Proton exchange membrane fuel cell (PEMFC) power system for high-power locomotive has both "oxygen starvation" and "oxygen saturation" under different working conditions. The oxygen starvation will occur if oxygen excess ratio (OER) is too low, which will casuse the oxygen deficiency and reduce the output power of PEMFC system so that the load demand can not be satisfied.At the same time, the"hot spot" will appear on the surface of MEA, causing the problems such as the stack short circuit,stack life cycle reduction. If OER is too high, it would enlarge the parasitic loss and reduce net output power of PEMFC system.Therefore, a model of PEMFC system of locomotive was established in this paper. An effictive division of OER working region and the feasibility of OER detection in locomotive application was also achieved based on the model, and then the static performance and the stability of PEMFC system were improved.