Abstract: A fuel gas supply apparatus for a fuel cell includes: a plurality of fuel gas supply sources, a plurality of fuel gas supply lines, a plurality of first valves disposed on the plurality of fuel gas supply lines, the first valves being capable of opening and closing on the basis of a pressure of a mixed gas of the plurality of fuel gases or a pressure of a mixed gas tank. A mixed gas supply line is provided for supplying the mixed gas containing at least one of the plurality of fuel gases to the fuel cell. The plurality of first valves open if the pressure of the mixed gas of the plurality of fuel gases or the pressure of the mixed gas tank becomes equal to or lower than a setting pressure, and the setting pressure is set to be different for each of the plurality of first valves.

Abstract: A combined power generation system is promptly activated, and stable operation thereof is provided. A control apparatus of the combined power generation system that generates power by performing cooperative operation combining an SOFC and an MGT, in which the combined power generation system includes: an exhaust fuel gas supply line that supplies exhaust fuel gas to a combustor of the MGT from the SOFC; a recirculation line that branches from the exhaust fuel gas supply line to flow the exhaust fuel gas to the SOFC; and a flow rate adjustment valve provided on a path of the exhaust fuel gas supply line, and in which a gain to an opening of the flow rate adjustment valve is adjusted according to an cooperative operation state of the SOFC and the MGT.

Abstract: A combined power generation system is promptly activated, and stable operation thereof is provided. A control apparatus of the combined power generation system that generates power by performing cooperative operation combining an SOFC and an MGT, in which the combined power generation system includes: an exhaust fuel gas supply line that supplies exhaust fuel gas to a combustor of the MGT from the SOFC; a recirculation line that branches from the exhaust fuel gas supply line to flow the exhaust fuel gas to the SOFC; and a flow rate adjustment valve provided on a path of the exhaust fuel gas supply line, and in which a gain to an opening of the flow rate adjustment valve is adjusted according to an cooperative operation state of the SOFC and the MGT.