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A method of controlling variable extraction flow in a combustion turbine engine, wherein extraction flow comprises a supply of compressed air extracted from the compressor and supplied to the turbine through extraction conduits, and wherein the extraction conduits includes a variable extraction orif

A method of controlling variable extraction flow in a combustion turbine engine, wherein extraction flow comprises a supply of compressed air extracted from the compressor and supplied to the turbine through extraction conduits, and wherein the extraction conduits includes a variable extraction orifice, the method comprising the steps of: measuring a plurality of turbine engine operating parameters; monitoring, by a control unit, the measured operating parameters of the combustion turbine engine; setting the variable extraction orifices to a setting that allows an approximate maximum level of extraction flow; calculating, by the control unit, at least one calculated operating parameter based upon model-based control and the measured operating parameters, including at least a current turbine inlet temperature and a maximum turbine inlet temperature; and manipulating the setting for the supply of fuel to the combustor such that an increased and/or maximum level of engine output is determined by comparing the values for the current turbine inlet temperature and the maximum turbine inlet temperature.

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1. A method of controlling variable extraction flow in a turbine engine that includes a compressor, a combustor and a turbine, wherein extraction flow comprises a supply of compressed air extracted from the compressor and supplied to the turbine while bypassing the combustor through one or more extr

1. A method of controlling variable extraction flow in a turbine engine that includes a compressor, a combustor and a turbine, wherein extraction flow comprises a supply of compressed air extracted from the compressor and supplied to the turbine while bypassing the combustor through one or more extraction conduits, and wherein at least one of the extraction conduits includes a variable extraction orifice that has a plurality of settings controlled by a control unit, the method comprising the steps of: measuring a plurality of turbine engine operating parameters, wherein the measured operating parameters include at least one associated with a temperature within the turbine, one associated with the setting of the variable extraction orifice, one associated with the level of extraction flow; one associated with a supply of fuel to the combustor;monitoring, by the control unit, the measured operating parameters of the combustion turbine engine;setting at least one variable extraction orifice to a setting that allows an approximate maximum level of extraction flow;calculating, by the control unit, at least one calculated operating parameter based upon model-based control and the measured operating parameters, including at least a current turbine inlet temperature and a maximum turbine inlet temperature;manipulating the setting for the supply of fuel to the combustor such that an increased and/or approximate maximum level of engine output is determined by comparing the values for the current turbine inlet temperature and the maximum turbine inlet temperature;determining if a system operator wants to increase and/or maximize engine output;setting at least one of the variable extraction orifices to a setting that allows an approximate maximum level of extraction flow;given any changes in the measured operating parameters that result from the setting that allows an approximate maximum level of extraction flow for the at least one variable extraction orifice, calculating the current turbine inlet temperature and the maximum turbine inlet temperature, wherein the calculation of the maximum turbine inlet temperature is based upon an approximate maximum combustor exit temperature at which the turbine engine may operate given the temperature limits of hot-gas path parts and the approximate level of extraction flow at the setting that allows an approximate maximum level of extraction flow for the at least one variable extraction orifice; andcomparing the current turbine inlet temperature and the maximum turbine inlet temperature. 2. The method of claim 1, wherein the current turbine inlet temperature comprises a current turbine inlet temperature, and the maximum turbine inlet temperature comprises the approximate maximum turbine inlet temperature that the turbine engine may operate at given the temperature limits of hot-gas path parts and the level of extraction flow. 3. The method of claim 1, wherein: variable extraction flow comprises extraction flow levels that vary depending on the setting of the variable extraction orifice; andthe variable extraction orifice has at least two discreet settings, which include a less open setting in which a reduced level of extraction flow is allowed through the variable extraction orifice and a more open setting in which an increased level of extraction flow is allowed through the variable extraction orifice. 4. The method of claim 1, wherein model-based control comprises a method of controlling a turbine engine based upon a computer-implemented model of the operation of the turbine engine, wherein the control of the turbine engine is based upon a plurality of measured operating parameters and calculated operating parameters, the calculated operating parameters being calculated based upon the computer-implemented model of operation and the measured operating parameters. 5. The method of claim 1, wherein at least a portion of the extracted flow is supplied to hot-gas path parts in the turbine such that the extracted flow cools the parts during operation. 6. The method of claim 1, wherein: the measuring of measured operating parameters is completed by a plurality of sensors, the plurality of sensors including at least one pressure transducer disposed downstream of the variable extraction orifice; andthe sensors collect operating parameters data and transmit the operating parameters data to the control unit. 7. The method of claim 1, further comprising the steps of: if it is determined that the current turbine inlet temperature exceeds the maximum turbine inlet temperature by a predetermined amount, decreasing the supply of fuel to the combustor; andif it is determined that the maximum turbine inlet temperature exceeds the current turbine inlet temperature by a predetermined amount, increasing the supply of fuel to the combustor. 8. The method of claim 7, wherein the steps of the method are repeated until the approximate maximum level of engine output is determined, wherein the approximate maximum level of engine output occurs when the supply of fuel to the combustor at which the current turbine inlet temperature is approximately equal to the maximum turbine inlet temperature. 9. The method of claim 1, wherein the step of manipulating the setting for the supply of fuel to the combustor such that an increased and/or approximate maximum level of engine output is determined by comparing the values for the current turbine inlet temperature and the maximum turbine inlet temperature comprises: manipulating the setting for the supply of fuel to the combustor such that an approximate maximum level of engine output is determined by comparing the values for the current turbine inlet temperature and the maximum turbine inlet temperature.