Gas turbine under frequency response improvement system and method
원문보기
IPC분류정보
국가/구분
United States(US) Patent
등록
국제특허분류(IPC7판)
G05D-011/00
H02P-009/04
F02C-009/26
F02C-009/46
출원번호
US-0751689
(2013-01-28)
등록번호
US-9209730
(2015-12-08)
발명자
/ 주소
Scipio, Alston Ilford
Davis, Dale J.
Hartman, Steven
Ekanayake, Sanji
Fernandez, Paul Robert
출원인 / 주소
General Electric Company
대리인 / 주소
Cusick, Ernest G.
인용정보
피인용 횟수 :
0인용 특허 :
6
초록▼
A system and method is provided that improves the under frequency response of gas turbines by providing a fast-response power augmentation system. The system includes a tank storing a blended mixture of motive fuel such as ethanol or methanol and demineralized water in a predetermined ratio that is
A system and method is provided that improves the under frequency response of gas turbines by providing a fast-response power augmentation system. The system includes a tank storing a blended mixture of motive fuel such as ethanol or methanol and demineralized water in a predetermined ratio that is provided as a diluent to be injected into the compressor bellmouth, the Compressor Discharge Chamber (CDC), and/or the combustion system via one to three dedicated circuits. To achieve the instantaneous injection of the diluent at the correct pressure and for the appropriate duration to meet the needs of the gas turbine Grid compliance mandate, an accumulator is used as the motive force to drive the augmentation fluid in the dedicated circuits. The injected diluent is microprocessor controlled to either be simultaneous into all three circuits or is sequenced based on a determination of the best turbine control and performance.
대표청구항▼
1. A turbine control system that controls provision of fuel and air to a turbine engine and/or an air compressor that provides compressed air to said turbine engine, said turbine engine being connected to a power grid to provide generated power thereto, said system comprising: at least one sensor th
1. A turbine control system that controls provision of fuel and air to a turbine engine and/or an air compressor that provides compressed air to said turbine engine, said turbine engine being connected to a power grid to provide generated power thereto, said system comprising: at least one sensor that monitors frequency fluctuations of said power grid from a standardized grid frequency value;an accumulator that stores a mixture of water and a motive fuel under pressure; anda controller that adjusts fuel and air flow to the turbine engine in response to detected grid frequency fluctuations, said controller providing the pressurized mixture of water and motive fuel to at least said compressor to augment mass flow to said turbine engine when said at least one sensor detects an under frequency condition of said power grid. 2. A turbine control system as in claim 1, wherein the motive fuel comprises at least one of: ethanol, methanol, or any combination thereof. 3. A turbine control system as in claim 1, wherein an output of said accumulator is arranged so as to selectively provide said mixture of water and motive fuel via a first flow path to a bellmouth of said compressor, via a second flow path to a compressor discharge chamber at an output of said compressor, via a third flow path to a combustion system of said turbine engine under control of said controller; or to any combination thereof. 4. A turbine control system as in claim 3, wherein said controller is programmed with a set of rules for controlling the delivery of the mass flow of the mixture that will be used for augmenting power output of the turbine engine in response to a detected under frequency condition of said power grid so as to selectively provide said mixture of water and motive fuel to said first, second and/or third flow path based on a degree of detected under frequency condition and response time requirements for correcting a detected under frequency condition. 5. A turbine control system as in claim 4, wherein said controller includes a processor that processes software to implement an algorithm based on turbine operating parameters, grid variations for determining the discharge pressure, and pressure degradation rate for rationing the mixture of water and motive fuel to the first, second and/or third flow paths in response to the detected under frequency condition. 6. A turbine control system as in claim 1, further comprising an air pressurization system that continuously charges said accumulator to a pressure that delivers effectively lag-free responsiveness in response to detection of an under frequency condition of said power grid. 7. A turbine control system as in claim 6, wherein said air pressurization system comprises a flow channel that provides compressor bleed to said accumulator under control of said controller. 8. A turbine control system as in claim 6, wherein said air pressurization system comprises a variable frequency discharge air pump. 9. A method of controlling the supply of fuel and air to a turbine engine and/or an air compressor that provides compressed air to said turbine engine, said turbine engine being connected to a power grid to provide generated power thereto, said method comprising: detecting an under frequency deviation of said power grid from a standardized grid frequency value;adjusting mass augmentation flow to at least said compressor by providing a pressurized mixture of water and a motive fuel to at least said compressor to augment mass flow to said turbine engine when said under frequency deviation of said power grid is detected. 10. A method as in claim 9, further comprising maintaining constant air flow from the compressor by modulating inlet guide vanes and fuel flow to the compressor and turbine engine to facilitate controlling a fuel to compressor discharge pressure ratio such that a combustor state of the turbine engine does not lag changes in air flow when a combustor of the turbine engine responds to the frequency deviation of said power grid. 11. A method as in claim 9, further comprising selectively providing said mixture of water and motive fuel via a first flow path to a bellmouth of said compressor, via a second flow path to a compressor discharge chamber at an output of said compressor, via a third flow path to a combustion system of said turbine engine under control of said controller, or via any combination thereof. 12. A method as in claim 11, wherein said providing of said mixture of water and motive fuel comprises processing an algorithm based on turbine operating parameters, grid variations for determining the discharge pressure, and pressure degradation rate for rationing the mixture of water and motive fuel to the first, second and/or third flow paths in response to the detected under frequency condition and selectively providing the mixture of water and motive fuel to said first, second and/or third flow path to correct said under frequency condition. 13. A method as in claim 9, further comprising pressurizing said mixture of water and motive fuel to a pressure that delivers effectively lag-free responsiveness in response to determination of an under frequency deviation of said power grid.
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이 특허에 인용된 특허 (6)
Zachary Richard E., Apparatus for monitoring wet compression gas turbine power augmentation-related casing distortions.
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