Patent ID: 7422809

Claim:
A method of operating a fuel cell system comprising a fuel cell ( 3 ) with an anode stream passage and a cathode stream passage, an anode supply system ( 1 ) for supplying a hydrogen-rich gas to the anode stream passage, a cathode supply system ( 2 ) for supplying an oxidant stream to the cathode stream passage and a controller ( 4 ) for operating the anode and cathode supply systems ( 1 , 2 ), the method comprising operating one supply system in dependence on the dynamic response of the other supply system, characterized in that the fuel cell system comprises a fuel processing system ( 1 ) for converting a supply fuel into a hydrogen-rich gas wherein the supply fuel mass flow (m Fuel ) to the fuel processing system ( 1 ) is set in dependence on the dynamic response of the cathode supply system ( 2 ).