A reformer fuel feed stream in fuel cell power system is catalytically
reacted into a reformate stream for a fuel cell stack by adjusting fuel
supply throughput according to a predefined throughput ramp when a time
derivative and the current demand for the fuel cell deviates from zero by
more than an acceleration threshold value. The fuel cell power system is
of special value when deployed on a vehicle where the load command is
derived from the accelerator pedal of the vehicle.