Patent ID: 8677761

Claim:
A method for controlling compressor extraction air flows from a compressor of a turbine system during turn down, the method comprising: monitoring, by a control unit, a combustor exit temperature of a turbine system; detecting, by the control unit, the combustor exit temperature is below a threshold, wherein the threshold is associated with a decrease in the exit temperature of the combustor; in response to detecting the combustor exit temperature is below the threshold, increasing the combustor exit temperature by transmitting a control signal to at least one variable orifice located in the turbine system causing the at least one variable orifice to alter at least one extraction air flow from the compressor, wherein prior to transmitting a control signal to at least one variable orifice located in the turbine system: transmitting to a user interface an indicator that the combustor exit temperature is below the threshold, and receiving, from the user interface, instructions to adjust at least one variable orifice located in the turbine system; detecting that at least one additional operating parameter is operating in a predetermined operating range; and based on the detection causing at least one additional variable orifice to increase the extraction air flow from the compressor.