METHOD OF ESTIMATING THE MAXIMUM POWER GENERATION CAPACITY AND FOR CONTROLLING A SPECIFIED POWER RESERVE OF A SINGLE CYCLE OR COMBINED CYCLE GAS TURBINE POWER PLANT, AND A POWER GENERATING SYSTEM FOR USE WITH SAID METHOD
First Claim
1. A method for controlling a specified power reserve of a gas turbine power plant having an input means which generates a load set-point signal for the gas turbine power plant and a controller which receives the load set-point signal and regulates a power output of the gas turbine power plant, the method comprising:
- continuously updating an estimate of the maximum power generation capacity of the gas turbine power plant;
calculating a load offset by specifying a power reserve and determining the load offset from the specified power reserve;
calculating a load limit as a difference of the estimate of the maximum power generation capacity and the load offset; and
applying the load limit as an upper limit of the load set-point signal to obtain a limited load set-point signal.
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Abstract
An estimation unit can estimate, on a real-time basis, a maximum power generation capacity of a single cycle or combined cycle gas turbine power plant. For example, the actual power output and the maximum power generation capacity can be calculated relying on a mathematical process model. Subsequently, the calculated actual power output can be compared with the measured power output yielding a model-estimation error. Based on the model-estimation error, a correction signal can be deduced, to correct the calculated maximum power generation capacity. A controller can maintain a specified power reserve. The controller can use an estimate of the maximum power generation capacity as a reference, subtract a load offset, and apply the resulting signal as upper limit of the load set-point.
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Citations
18 Claims
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1. A method for controlling a specified power reserve of a gas turbine power plant having an input means which generates a load set-point signal for the gas turbine power plant and a controller which receives the load set-point signal and regulates a power output of the gas turbine power plant, the method comprising:
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continuously updating an estimate of the maximum power generation capacity of the gas turbine power plant; calculating a load offset by specifying a power reserve and determining the load offset from the specified power reserve; calculating a load limit as a difference of the estimate of the maximum power generation capacity and the load offset; and applying the load limit as an upper limit of the load set-point signal to obtain a limited load set-point signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A power generating system, comprising:
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a gas turbine power plant; an input means for generating a load set-point signal for the gas turbine power plant; a controller for receiving the load set-point signal and for regulating the power output of the gas turbine power plant; and an input means for specifying a power reserve; wherein the controller is configured for; operating the gas turbine power plant such that the specified power reserve is maintained; using a continuously updated estimate of the maximum power generation capacity of the gas turbine power plant; calculating a load offset by specifying a power reserve and for determining the load offset from the specified power reserve; calculating a load limit as a difference of said estimate of the maximum power generation capacity and said load offset; and applying said limit as an upper limit of said load set-point signal to obtain a limited load set-point signal. - View Dependent Claims (16, 17, 18)
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Specification