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US 8,510,013 B2Granted
Gas turbine shutdown
AssigneeGeneral Electric Company
InventorsHarold Lamar Jordan, Jr., David August Snider
Life of this patent
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Abstract
A gas turbine includes a rotor, and a controller for controlling a shutdown of the gas turbine based on a target fuel-to-air ratio profile and/or controlling a rotor speed according to a target speed schedule to attain a specified duration for the shutdown. The controller controls the rotor speed by engaging the starting system to turn the rotor.
Claims17
A gas turbine configured to connect to a power plant, the gas turbine comprising:
- a rotor;
- and
- a controller for controlling a shutdown of the gas turbine to minimize shutdown variation by controlling at least one of:
- air flow, speed of the rotor or fuel flow, the controller including a modeler configured to generate a model of operation of the gas turbine,
- wherein the model includes a fuel-to-air ratio profile for the gas turbine.
2 more elements
A gas turbine comprising:
- a rotor;
- a generator including a starting system coupled to the rotor for powered turning of the rotor;
- a modeler communicatively connected to the rotor and configured to generate a model of operation of the gas turbine which includes a target fuel-to-air ratio profile for the gas turbine;
- and
- a controller for controlling shutdown of the gas turbine, the controller configured to control an air flow to the gas turbine according to the target fuel-to-air ratio profile, and to control a speed of the rotor according to a target speed schedule to attain a specified duration for a shutdown of the gas turbine, the controller controlling the speed of the rotor by engaging the starting system to turn the rotor.
2 more elements
A method comprising:
- modeling operation of a gas turbine to generate a target fuel-to-air ratio profile;
- and
- controlling a shutdown of the gas turbine by controlling at least one of:
- an air flow to the gas turbine to attain the target fuel-to-air ratio profile,
- a fuel flow to the gas turbine to attain the target fuel-to-air ratio profile, or
- a speed of a rotor of the gas turbine according to a target speed schedule configured to attain a specified duration for the shutdown,
- wherein the rotor speed controlling includes:
- generating a nominal starting system schedule to attain a desired deceleration profile for the speed of the rotor;
- determining an error between an actual speed of the rotor and the target speed schedule;
- and
- controlling a torque output of a starting system connected to the gas turbine to correct for the error.
8 more elements
Dependencies are inferred from the claim text.