US4201923A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined cycle electric power plant and a gas turbine having improved megawatt load control
Assignee: Westinghouse Electric Corp
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Filing: 1974-08-08
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Granted: 1980-05-06
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Expires: 1994-08-08
Abstract
Abstract A combined cycle electric power plant includes gas and steam turbines and steam generators and a digital/analog control system. A gas turbine megawatt load control system is included in the control and it includes a feedforward load control which generates a fuel reference equal to the sum of a megawatt load demand and an idle speed fuel demand. The megawatt load control also includes a feedback load trimmer which provides minor corrective action on the operation of the feedforward load control. Gas turbine and combined cycle plant operation results in the generation of megawatts equal to an input demand value.
Inventors
- 👤 Terry J. Reed
- 👤 Jack R. Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 20:22
CPC Classifications
F; F02; F02C; F02C9/00; F02C9/26; F01; F01K; F01K23/00; F01K23/02; F01K23/06; F01K23/10; F01K23/103; F01K23/105; F05; F05D; F05D2200/00; F05D2200/10; F05D2200/11; Y; Y02; Y02E; Y02E20/00; Y02E20/16
Claims Analysis
Total Claims: 24
Claim 1
Independent Claim
105 words
A gas turbine electric power plant comprising a compressor section and a turbine section, a plurality of combustors for energizing the driving gas flow for the turbine section, means for generating electric power under the driving power of the turbine, a gas turbine control system including means for controlling the flow of fuel to the turbine combustors, means for generating a fuel reference having one portion thereof corresponding to load demand in units of electrical power generation and having another portion thereof corresponding to the fuel required for idling operation, and means for coupling said fuel reference generating means to said fuel flow controlling means.
Claim 2
Dependent Claim
105 words
A gas turbine electric power plant comprising a compressor section and a turbine section, a plurality of combustors for energizing the driving gas flow for the turbine section, means for generating electric power under the driving power of the turbine, a gas turbine control system including means for controlling the flow of fuel to the turbine combustors, means for generating a fuel reference having one portion thereof corresponding to load demand in units of electrical power generation and having another portion thereof corresponding to the fuel required for idling operation, and means for coupling said fuel reference generating means to said fuel flow controlling means.
Claim 3
Dependent Claim
65 words
A gas turbine electric power plant as set forth in claim 1 wherein said fuel reference generating means functions as a feedforward control element in a forward load control channel, means are provided for generating the signal representative of actual generated electrical power, and means are provided for correctively trimming the fuel reference in response to the actual power signal to satisfy the load demand.
Claim 4
Dependent Claim
30 words
A gas turbine electric power plant as set forth in claim 1 wherein said control system includes a programmed digital computer, and said computer includes said fuel reference generating means.
Claim 5
Dependent Claim
52 words
A gas turbine electric power plant as set forth in claim 1 wherein means are provided for generating a fuel reference during turbine startup, and said load fuel reference generating means includes means for registering the startup fuel reference at idle speed to provide said other portion of the load fuel reference.
Claim 6
Dependent Claim
65 words
A gas turbine electric power plant as set forth in claim 4 wherein said fuel reference generating means functions as a feedforward control element in a forward load control channel, means are provided for generating the signal representative of actual generated electrical power, and means are provided for correctively trimming the fuel reference in response to the actual power signal to satisfy the load demand.
Claim 7
Dependent Claim
37 words
A gas turbine electric power plant as set forth in claim 1 wherein means are coupled to said fuel reference generating means to cut back or to hold the fuel reference in response to predetermined limit conditions.
Claim 8
Dependent Claim
50 words
A gas turbine electric power plant as set forth in claim 4 wherein means are provided for generating a ramp toward a demand value at a controllable rate and means are provided for coupling said ramp generating means to function as a part of said load fuel reference generating means.
Claim 9
Dependent Claim
92 words
A gas turbine electric power plant as set forth in claim 4 wherein said fuel reference generating means functions as a feedforward control element in a forward load control channel, means are provided for generating the signal representative of actual generated electrical power, means are provided for correctively trimming the fuel reference in response to the actual power signal to satisfy load demand, and means are provided for adding an output from said trim correcting means with the registered startup fuel reference and the load demand portion of the load fuel reference.
Claim 10
Dependent Claim
69 words
A control system for an electric power plant gas turbine comprising means for controlling the flow of fuel to the gas turbine, means for generating a fuel reference having one portion thereof corresponding to load demand in units of electrical power generation having another portion thereof corresponding to the fuel required for idling operation, and means for coupling said fuel reference generating means to said fuel flow controlling means.
Claim 11
Dependent Claim
69 words
A control system for an electric power plant gas turbine comprising means for controlling the flow of fuel to the gas turbine, means for generating a fuel reference having one portion thereof corresponding to load demand in units of electrical power generation having another portion thereof corresponding to the fuel required for idling operation, and means for coupling said fuel reference generating means to said fuel flow controlling means.
Claim 12
Dependent Claim
62 words
A control system as set forth in claim 9 wherein said fuel reference generating means functions as a feedforward control element in a forward load control channel, means are provided for generating the signal representative of actual generated electrical power, and means are provided for correctively trimming the fuel reference in response to the actual power signal to satisfy the load demand.
Claim 13
Dependent Claim
27 words
A control system as set forth in claim 9 wherein said control system includes a programmed digital computer, and said computer includes said fuel reference generating means.
Claim 14
Dependent Claim
49 words
A control system as set forth in claim 9 wherein means are provided for generating a fuel reference during turbine startup, and said load fuel reference generating means includes means for registering the startup fuel reference at idle speed to provide said other portion of the load fuel reference.
Claim 15
Dependent Claim
62 words
A control system as set forth in claim 12 wherein said fuel reference generating means functions as a feedforward control element in a forward load control channel, means are provided for generating the signal representative of actual generated electrical power, and means are provided for correctively trimming the fuel reference in response to the actual power signal to satisfy the load demand.
Claim 16
Dependent Claim
34 words
A control system as set forth in claim 9 wherein means are coupled to said fuel reference generating means to cut back or to hold the fuel reference in response to predetermined limit conditions.
Claim 17
Dependent Claim
47 words
A control system as set forth in claim 12 wherein means are provided for generating a ramp toward a demand value at a controllable rate and means are provided for coupling said ramp generating means to function as a part of said load fuel reference generating means.
Claim 18
Dependent Claim
90 words
A control system as set forth in claim 12 wherein said fuel reference generating means functions as a feedforward control element in a forward load control channel, means are provided for generating the signal representative of actual generated electrical power, means are provided for correctively trimming the fuel reference in response to the actual power signal to satisfy the load demand, and means are provided for adding an output from said trim correcting means with the registered startup fuel reference and the load demand portion of the load fuel reference.
Claim 19
Dependent Claim
133 words
A combined cycle electric power plant comprising at least one gas turbine, means for generating steam in response to heat energy from said gas turbine, a steam turbine driven by steam supplied to it from said steam generating means, means for generating electric power under the driving power of said turbines, means for controlling the operation of said turbines and said steam generating means, said controlling means including a gas turbine control system having means for controlling the flow of fuel to said gas turbine, means for generating a fuel reference having one portion thereof corresponding to load demand in units of electrical power generation and having another portion thereof corresponding to the fuel required for idling operation, and means for coupling said fuel reference generating means to said fuel flow controlling means.
Claim 20
Dependent Claim
133 words
A combined cycle electric power plant comprising at least one gas turbine, means for generating steam in response to heat energy from said gas turbine, a steam turbine driven by steam supplied to it from said steam generating means, means for generating electric power under the driving power of said turbines, means for controlling the operation of said turbines and said steam generating means, said controlling means including a gas turbine control system having means for controlling the flow of fuel to said gas turbine, means for generating a fuel reference having one portion thereof corresponding to load demand in units of electrical power generation and having another portion thereof corresponding to the fuel required for idling operation, and means for coupling said fuel reference generating means to said fuel flow controlling means.
Claim 21
Dependent Claim
65 words
A combined cycle electric power plant as set forth in claim 17 wherein said fuel reference generating means functions as a feedforward control element in a forward load control channel, means are provided for generating the signal representative of actual generated electrical power, and means are provided for correctively trimming the fuel reference in response to the actual power signal to satisfy the load demand.
Claim 22
Dependent Claim
30 words
A combined cycle electric power plant as set forth in claim 17 wherein said control system includes a programmed digital computer, and said computer includes said fuel reference generating means.
Claim 23
Dependent Claim
52 words
A combined cycle electric power plant as set forth in claim 17 wherein means are provided for generating a fuel reference during turbine startup, and said load fuel reference generating means includes means for registering the startup fuel reference at idle speed to provide said other portion of the load fuel reference.
Claim 24
Dependent Claim
65 words
A combined cycle electric power plant as set forth in claim 17 wherein said fuel reference generating means functions as a feedforward control element in a forward load control channel, means are provided for generating the signal representative of actual generated electrical power, and means are provided for correctively trimming the fuel reference in response to the actual power signal to satisfy the load demand.
References Cited (Backward Citations)
US3866109A
Cited
US3762162A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-05-06 | 1983-11-05 | 1984-05-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-05-06 | 1987-11-05 | 1988-05-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-05-06 | 1991-11-05 | 1992-05-06 | $7700.00 | Window Closed / Lapsed |