Control Oriented Modeling of Solid Oxide Fuel Cell Auxiliary Power Unit for Transportation Applications

摘要: This paper reports on the development of a control-oriented model for simulating hybrid auxiliary power unit (APU) equipped with solid oxide fuel cell (SOFC) stack. Such work is motivated by strong interest devoted to SOFC technology due its highly appealing potentialities in terms savings, flexibility, cogeneration, low-pollution and low-noise operation. In this context, availability acceptable computational burden satisfactory accuracy can significantly enhance both system control strategy design phases APUs destined wide application area (e.g., mild-hybrid cars, trains, ships, airplanes). The core part stack, surrounded number ancillary devices: air compressor/blower, regulating pressure valves, heat exchangers, prereformer, postburner. Since thermal dynamics clearly slowest one, lumped-capacity proposed describe response exchangers load (i.e., operating current) variation. stack takes into account dependence voltage temperature, thus adequately describing typical undershoot following decrease demand. On other hand, their faster mass transfer electrochemistry processes are assumed instantaneous. hybridizing device, whose main purpose assist ancillaries) during transient conditions, consists lead-acid battery pack. Battery current modeled, taking influence actual state charge open circuit internal resistance. developed APU was tested demand profiles heavy-duty truck parked-idling phases. Suited strategies also were avoid under severe transients and, at same time, guarantee sustaining operation order assess benefits achievable introducing SOFC-APU board commercial truck, simulated consumption compared consumed idling engine. From simulation carried out, it emerges how allows achieving potential reduction up 70%.