Model-based coordinated air-fuel control for a gas turbine

F - Mech Eng,Light,Heat,Weapons – 02 – C

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F02C 9/50 (2006.01) F02C 9/28 (2006.01)

Patent

CA 2717613

A fuel controller (33), and associated method, provides a fuel control output signal (49) to a fuel control actuator (47) to control operations. The fuel controller (33) determines the fuel control output signal (49) based on rotational speed error. A combustion air controller (35) provides a combustion air control output signal (59) to a combustion air control actuator (61) to control operations. A cross channel controller (15) is in communication with the fuel controller (33) and the combustion air controller (35). The cross channel controller (15) provides a combustion air control modification signal (67) to the combustion air controller (35). The combustion air control modification signal (67) is determined from the fuel control output signal (49) using an air versus fuel model (71). The combustion air controller (35) determines a preliminary combustion air control signal (63) based on an exhaust temperature error, and further determines the combustion air control output signal (59) based on both of the preliminary combustion air control signal (63) and the combustion air control modification signal (67).

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