US 11,143,115 B2Granted

Gas turbine system and control apparatus and method thereof

OwnerByung Hee Choiinventor

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Abstract

A gas turbine system can estimate an amount of compressed air supplied to a combustor and limit a fuel amount according to the estimated compressed air amount. A control apparatus of the system includes a sensing unit to measure the turbine rotor speed; a compressed air amount estimation unit to estimate a change rate MR of an amount of compressed air produced by the compressor and supplied to the combustor, based on the measured turbine rotor speed; and a fuel amount control unit to control a fuel amount FC supplied to the combustor, based on the estimated change rate MR. The control apparatus can preemptively control the fuel amount in response to variations in the compressed air amount by a momentarily changing turbine rotor speed and can limit the turbine inlet temperature to below the maximum allowable temperature, to protect the turbine and/or combustor against fluctuations in compressed air amount.

Claims8

Dependent claims

A control method of a gas turbine system which includes a compressor configured to produce compressed air by sucking and compressing external air, a combustor configured to produce high-temperature high-pressure combustion gas by combusting the compressed air and fuel, and a turbine including a rotor rotated by the combustion gas produced through the combustor, wherein the compressor and the turbine are coaxially connected and a speed of the turbine rotor is proportional to a system frequency, the control method comprising:

measuring the speed of the turbine rotor;
estimating a change ratio MR of an amount of compressed air supplied to the combustor depending on a change in the measured speed of the turbine rotor;
and
controlling a fuel amount Fc supplied to the combustor according to the change ratio MR,
wherein the measuring includes measuring the amount of compressed air which is produced by the compressor and supplied to the combustor, measuring an inlet temperature of the compressor, and measuring a position of an inlet guide vane for inducing air to the compressor,
wherein the estimating includes storing first data that is a calculated amount of compressed air according to the inlet temperature of the compressor, storing second data that is a calculated amount of compressed air according to the position of the inlet guide vane, and estimating the change ratio MR according to at least one of the first data and the second data,
wherein the controlling includes correcting the change ratio MR of the amount of compressed air according to at least one of the first data and the second data.

4 more elements

A gas turbine system comprising:

a compressor configured to produce compressed air by sucking and compressing external air;
a combustor configured to produce combustion gas by combusting the compressed air and fuel;
a turbine coaxially connected to the compressor, the turbine including a rotor rotated by the combustion gas produced through the combustor and having a rotational speed proportional to a system frequency;
and
a controller including a sensor unit,
wherein the controller is configured to:
measure the speed of the turbine rotor;
estimate a change ratio MR of an amount of compressed air supplied to the combustor depending on a change in the measured speed of the turbine rotor;
and
control a fuel amount Fc supplied to the combustor according to the change ratio MR,
wherein the controller is further configured to measure the amount of compressed air which is produced by the compressor and supplied to the combustor, to measure an inlet temperature of the compressor, and to measure a position of an inlet guide vane for inducing air to the compressor,
wherein the controller is further configured to store first data that is a calculated amount of compressed air according to the inlet temperature of the compressor, to store second data that is a calculated amount of compressed air according to the position of the inlet guide vane, and to estimate the change ratio MR according to at least one of the first data and the second data, and
wherein the controller is further configured to correct the change ratio MR of the amount of compressed air according to at least one of the first data and the second data.

10 more elements

Dependencies are inferred from the claim text.

Facts

Application: 15/953,408Filed 14 Apr 2018
Priority: KR 10-2017-005238624 Apr 2017
Published: US 2018/0306124 A125 Oct 2018
Granted: 12 Oct 2021
Term ends: Not estimatedThe source records don’t support an estimate.

Classification10 codes

F02C 9/54
With control of working fluid flow: by throttling the working fluid, by adjusting vanes
F02C 7/22
Features, components parts, details or accessories, not provided for in, or of interest apart form groups F02C1/00 - F02C6/00; Air intakes for…:…
F02C 9/20
Control of working fluid flow: by throttling; by adjusting vanes
F02C 9/28
Control of fuel supply: regulating systems responsive to plant or ambient parameters, e.g. temperature, pressure, rotor speed