NOVELTY - A fuel cell system comprises a fuel cell power module (12) including a fuel cell stack; electrical storage device for providing power limit signals and state of charge signal; average power calculation processor (16) responsive to a power demand signal; weighting function processor (20) responsive to state of charge signal; multiplier (24) for multiplying weighting signal and average power signal; power comparison processor responsive to power demand signal, fuel cell power module signal and power limit signals; and adder (26) responsive to output signal and multiplied signal.    USE - A fuel cell system for a hybrid fuel cell vehicle and for reducing fast voltage transients of fuel cell power module.    ADVANTAGE - The system employs a floating base load strategy that reduces fast power transient demands from the fuel cell power module.    DETAILED DESCRIPTION - A fuel cell system comprises:    (1) fuel cell power module (12) including a fuel cell stack and for providing a fuel cell power module signal indicative of current output power of the module;    (2) electrical storage device for providing power limit signals indicative of current power limits of the device and a state of charge signal indicative of current state of charge of the device;    (3) average power calculation processor (16) responsive to a power demand signal and for providing an average power signal based on power demand signals from a predetermined previous period of time;    (4) weighting function processor (20) responsive to state of charge signal and for providing a weighting signal that decreases as the state of charge of electrical storage device approaches its maximum state of charge and increases as the state of charge of electrical storage device approaches its minimum state of charge;    (5) multiplier (24) for multiplying the weighting signal and average power signal, and providing a multiplied signal;    (6) power comparison processor responsive to power demand signal, fuel cell power module signal and power limit signals, for subtracting the fuel cell power module signal from power demand signal to provide a difference signal between the difference of current power and demanded power, and for comparing the difference signal to power limit signals of electrical storage device, where if the difference signal exceeds the power limits of electrical storage device an output signal is generated to indicate an increase or decrease of output power from fuel cell power module, and where if the difference signal is within the power limits of electrical storage device, the output signal of power comparison processor is zero; and    (7) adder (26) responsive to output signal of power comparison processor and multiplied signal, and for providing an output signal for changing the fuel cell power module signal based on power demand signal.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of a power system.    Fuel cell power module (12)    Average power calculation processor (16)    Weighting function processor (20)    Multiplier (24)    Adder (26)