Hybrid power generation equipment and control method thereof

A method of controlling a hybrid power generation facility including a gas turbine including a compressor configured to compress air introduced from an outside, a combustor configured to mix compressed air supplied from the compressor with fuel and to combust the air and fuel mixture, and a turbine configured to produce power with first combustion gas discharged from the combustor, a boiler including a combustion chamber and a burner installed in the combustion chamber and into which the first combustion gas discharged from the turbine of the gas turbine is introduced, a steam turbine through which steam generated in the combustion chamber passes, a first GT (gas turbine) pipeline connected between the turbine of the gas turbine and the burner, a first air pipeline connected to the first GT pipeline and configured to supply oxygen to the burner, a first oxygen sensor installed at an inlet of the burner and configured to measure an oxygen concentration of a fluid flowing into the burner, a first GT damper installed in the first GT pipeline and configured to control a flow rate of a fluid flowing through the first GT pipeline according to the oxygen concentration measured by the first oxygen sensor, a first heat exchanger through which the first air pipeline extends and second combustion gas discharged from the combustion chamber passes such that oxygen flowing through the first air pipeline is heat-exchanged with the second combustion gas in the first heat exchanger, a second heat exchanger through which feed water passes preheated by steam discharged from the steam turbine, a first heat exchange pipeline configured to transfer the second combustion gas discharged from the combustion chamber through the first heat exchanger, a second heat exchange pipeline branched from the first heat exchange pipeline and configured to transfer the second combustion gas discharged through the second heat exchanger, a first temperature sensor installed in the first heat exchange pipeline at an outlet of the first heat exchanger and configured to measure a temperature of the second combustion gas passing through the first heat exchanger, and an auxiliary damper installed in the second heat exchange pipeline at an inlet of the second heat exchanger and configured to control a flow rate of the second combustion gas supplied to the second heat exchanger according to the temperature measured by the first temperature sensor,

• the method comprising:
• measuring, by the first oxygen sensor, a concentration of oxygen of a fluid supplied to the burner;
• determining whether the measured concentration is greater than or equal to a first reference concentration;
• throttling, by the first GT damper, the first GT pipeline to reduce a flow rate of the fluid if the measured concentration is lower than the first reference concentration;
• measuring, by the first temperature sensor, the temperature of the second combustion gas discharged from the first heat exchanger through the first heat exchange pipeline;
• determining whether the measured temperature is equal to or lower than a first reference temperature;
• and
• opening, by the auxiliary damper, the second heat exchange pipeline if the measured temperature of the second combustion gas is higher than the first reference temperature.