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In a primary or backup control system for operating a gas turbine, a blade path temperature limit signal is generated which acts as a check on a fuel scheduling signal to the turbine which might otherwise cause excursion of the blade path temperature beyond prescribed limits. The means for generatin

In a primary or backup control system for operating a gas turbine, a blade path temperature limit signal is generated which acts as a check on a fuel scheduling signal to the turbine which might otherwise cause excursion of the blade path temperature beyond prescribed limits. The means for generating the blade path temperature limit signal is adapted however so that a preliminary error signal is conditioned to behave in one manner in response to a condition of increasing temperature and in another manner to a condition of decreasing temperature. This two-way response is achieved by utilizing a plurality of proportional signal limiters, each one of which is matched to or tuned in accordance with the characteristics of the gas turbine. Further, the response duality is automatic and subject to the particular condition of temperature change which obtains. In addition, means are provided for generating a temperature limit signal which is clamped to a fixed, predetermined percentage of the fuel scheduling signal. This signal is employed, under appropriate conditions, in place of the conditioned error signal to insure that the conditioned error signal does not otherwise set the fuel scheduling signal at less than the fixed percentage above its 100% value. Acting in concert, the means for conditioning the preliminary error signal and the means for generating the clamped temperature signal yield increased turbine protection, greater operating stability and more rapid control response where permissible.

대표청구항 ▼

Apparatus for controlling fuel flow to a turbine including: a. input means for receiving representations of information concerning predetermined turbine operating parameters; b. speed control means, including means for generating a turbine speed setpoint, operably related to said input means for dev

Apparatus for controlling fuel flow to a turbine including: a. input means for receiving representations of information concerning predetermined turbine operating parameters; b. speed control means, including means for generating a turbine speed setpoint, operably related to said input means for developing a speed error for use in adjusting fuel flow; c. temperature control means, including means for generating a blade path temperature error which changes at a first rate under a first condition when the measured temperature is above the setpoint and at a second rate under a second condition when the measured temperature is below the setpoint, operably related to said input means, for developing a temperature limit for use in adjusting fuel flow; and d. selector means, operably related to said speed control means, said temperature control means and the turbine, for selecting in accordance with a predetermined criteria said speed error or said temperature limit for use in adjusting fuel flow.