US5095221A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Gas turbine control system having partial hood control
Assignee: Siemens Energy Inc
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Filing: 1989-11-03
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Granted: 1992-03-10
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Expires: 2009-11-03
Abstract
Abstract Method and apparatus for controlling fuel flow in a combustion turbine, wherein a speed reference signal is given and wherein an actual speed signal is given, is shown to include a fuel flow regulator for regulating the flow of fuel in response to a control signal, a controller for generating a control signal representative of the difference between the actual speed signal and the speed reference signal, a first adjustment member for modifying the speed reference signal to account for droop prior to generation of the control signal, and a second adjustment means for modifying the speed reference signal to account for speed error also prior to generating the control signal. A load condition specifically envisioned for use with the present invention is the point of closure of the generator breaker.
Inventors
- 👤 Paul J. Tyler
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-24 11:50
CPC Classifications
F; F02; F02C; F02C9/00; F02C9/48; F02C9/50; F02C9/54; F02C9/26; F02C9/28; F02C9/40; F05; F05D; F05D2270/00; F05D2270/01; F05D2270/05
Claims Analysis
Total Claims: 25
Claim 1
Independent Claim
199 words
Apparatus for controlling fuel flow in a combustion turbine, wherein a speed reference signal is given and wherein an actual speed signal is given, said apparatus comprising, fuel flow means for regulating the flow of fuel in said combustion turbine in response to a control signal; controller means for generating a control signal representative of the difference between said actual speed signal and said speed reference signal and for providing said control signal to said fuel flow means; first adjustment means for modifying said speed reference signal to account for droop prior to generating said control signal, said first adjustment signal representative of droop and first subtraction means for determining an adjusted speed reference signal by subtracting the droop reference signal from said speed reference signal; second adjustment means for modifying said speed reference signal to account for speed error prior to generating said control signal, said second adjustment means comprising, error means for determining the error between said speed reference signal and said actual speed signal and second subtraction means for subtracting said error from said adjusted speed reference signal; and enabling means for enabling said first and second adjustment means on the occurrence of a prescribed event.
Claim 2
Dependent Claim
199 words
Apparatus for controlling fuel flow in a combustion turbine, wherein a speed reference signal is given and wherein an actual speed signal is given, said apparatus comprising, fuel flow means for regulating the flow of fuel in said combustion turbine in response to a control signal; controller means for generating a control signal representative of the difference between said actual speed signal and said speed reference signal and for providing said control signal to said fuel flow means; first adjustment means for modifying said speed reference signal to account for droop prior to generating said control signal, said first adjustment signal representative of droop and first subtraction means for determining an adjusted speed reference signal by subtracting the droop reference signal from said speed reference signal; second adjustment means for modifying said speed reference signal to account for speed error prior to generating said control signal, said second adjustment means comprising, error means for determining the error between said speed reference signal and said actual speed signal and second subtraction means for subtracting said error from said adjusted speed reference signal; and enabling means for enabling said first and second adjustment means on the occurrence of a prescribed event.
Claim 3
Dependent Claim
15 words
The apparatus of claim 1, wherein said controller means comprises a proportional integral differential controller.
Claim 4
Dependent Claim
163 words
An electric power plant, comprising: a combustion turbine having a shaft, said combustion turbine being operative to turn said shaft in response to the combustion of fuel in said turbine and said combustion turbine having fuel flow means to regulate the flow of said fuel in response to a control signal; a generator connected to said shaft so that electric power is produced when said turbine shaft turns; first reference means for generating a speed reference signal and an actual speed signal; controller means for generating a control signal representative of the difference between said actual speed signal and said speed reference signal and for providing said control signal to said fuel flow means, said control means comprising a proportional integral differential controller. first adjustment means for modifying said speed reference signal to account for droop prior to generating said control signal; and second adjustment means for modifying said speed reference signal to account for speed error prior to generating said control signal.
Claim 5
Dependent Claim
163 words
An electric power plant, comprising: a combustion turbine having a shaft, said combustion turbine being operative to turn said shaft in response to the combustion of fuel in said turbine and said combustion turbine having fuel flow means to regulate the flow of said fuel in response to a control signal; a generator connected to said shaft so that electric power is produced when said turbine shaft turns; first reference means for generating a speed reference signal and an actual speed signal; controller means for generating a control signal representative of the difference between said actual speed signal and said speed reference signal and for providing said control signal to said fuel flow means, said control means comprising a proportional integral differential controller. first adjustment means for modifying said speed reference signal to account for droop prior to generating said control signal; and second adjustment means for modifying said speed reference signal to account for speed error prior to generating said control signal.
Claim 6
Dependent Claim
34 words
The apparatus of claim 3, wherein said first adjustment means generates an adjusted speed reference signal and wherein said second adjustment means accounts for said speed error by modifying said adjusted speed reference signal.
Claim 7
Dependent Claim
42 words
The apparatus of claim 3, wherein said first adjustment means comprises droop means for generating a droop reference signal representative of droop, subtraction means for determining an adjusted speed reference signal by subtracting said droop reference signal from said speed reference signal.
Claim 8
Dependent Claim
41 words
The apparatus of claim 5, wherein said second adjustment means comprises error means for determining the error between said speed reference signal and said actual speed signal and second subtraction means for subtracting said error from said adjusted speed reference signal.
Claim 9
Dependent Claim
24 words
The apparatus of claim 6, further comprising enabling means for enabling said first and second adjustment means on the occurance of a prescribed event.
Claim 10
Dependent Claim
29 words
The apparatus of claim 7, further comprising a generator breaker for connecting said generator to a power system and wherein said prescribed event is the closing of said breaker.
Claim 11
Dependent Claim
71 words
The apparatus of claim 7, wherein said combustion turbine includes a select means for selecting a signal to control fuel flow and wherein said enabling means comprises a zero reference means for providing a zero reference signal and switch means for providing said zero reference signal to said said first and second adjustment means prior to the occurence of said event in place of said droop reference signal and said error.
Claim 12
Dependent Claim
130 words
Apparatus for controlling fuel flow in a combustion turbine, wherein a speed reference signal is given and wherein an actual speed signal is given, and wherein a device is provided for regulating the flow of fuel in said combustion turbine in response to a control signal, said apparatus comprising: controller means for generating a control signal representative of the difference between the actual speed signal and the speed reference signal and for providing said control signal to said fuel flow device, said control means comprising a proportional integral differential controller; first adjustment means for modifying the speed reference signal to account for droop prior to generating said control signal; and second adjustment means for modifying the speed reference signal to account for speed error prior to generating the control signal.
Claim 13
Dependent Claim
130 words
Apparatus for controlling fuel flow in a combustion turbine, wherein a speed reference signal is given and wherein an actual speed signal is given, and wherein a device is provided for regulating the flow of fuel in said combustion turbine in response to a control signal, said apparatus comprising: controller means for generating a control signal representative of the difference between the actual speed signal and the speed reference signal and for providing said control signal to said fuel flow device, said control means comprising a proportional integral differential controller; first adjustment means for modifying the speed reference signal to account for droop prior to generating said control signal; and second adjustment means for modifying the speed reference signal to account for speed error prior to generating the control signal.
Claim 14
Dependent Claim
34 words
The apparatus of claim 10, wherein said first adjustment means generates an adjusted speed reference signal and wherein said second adjustment means accounts for said speed error by modifying said adjusted speed reference signal.
Claim 15
Dependent Claim
42 words
The apparatus of claim 10, wherein said first adjustment means comprises droop means for generating a droop reference signal representative of droop, subtraction means for determining an adjusted speed reference signal by subtracting said droop reference signal from said speed reference signal.
Claim 16
Dependent Claim
41 words
The apparatus of claim 2, wherein said second adjustment means comprises error means for determining the error between said speed reference signal and said actual speed signal and second subtraction means for subtracting said error from said adjusted speed reference signal.
Claim 17
Dependent Claim
24 words
The apparatus of claim 13, further comprising enabling means for enabling said first and second adjustment means on the occurance of a prescribed event.
Claim 18
Dependent Claim
71 words
The apparatus of claim 4, wherein said combustion turbine includes a select means for selecting a signal to control fuel flow and wherein said enabling means comprises a zero reference means for providing a zero reference signal and switch means for providing said zero reference signal to said said first and second adjustment means prior to the occurence of said event in place of said droop reference signal and said error.
Claim 19
Independent Claim
122 words
A method for controlling fuel flow in a combustion turbine, wherein a speed reference signal is given and wherein an actual speed signal is given, said method comprising the steps of; regulating the flow of fuel in the combustion turbine in response to a control signal; generating a control signal representative of the difference between said actual speed signal and said speed reference signal and providing said control signal to said fuel flow means, wherein the generation of said control signal is achieved by a proportional integral differential control method; modifying the speed reference signal to account for droop prior to generating the control signals; and modifying the speed reference signal to account for speed error prior to generating the control signal.
Claim 20
Independent Claim
122 words
A method for controlling fuel flow in a combustion turbine, wherein a speed reference signal is given and wherein an actual speed signal is given, said method comprising the steps of; regulating the flow of fuel in the combustion turbine in response to a control signal; generating a control signal representative of the difference between said actual speed signal and said speed reference signal and providing said control signal to said fuel flow means, wherein the generation of said control signal is achieved by a proportional integral differential control method; modifying the speed reference signal to account for droop prior to generating the control signals; and modifying the speed reference signal to account for speed error prior to generating the control signal.
Claim 21
Dependent Claim
48 words
The method of claim 16, wherein said step of modifying said speed reference signal to account for droop comprises the steps of generating a droop reference signal representative of droop and determining an adjusted speed reference signal by subtracting said droop reference signal from said speed reference signal.
Claim 22
Dependent Claim
46 words
The apparatus of claim 17, wherein said step of modifying said speed reference signal to account for speed error comprises the steps of determining the error between said speed reference signal and said actual speed signal and subtracting said error from said adjusted speed reference signal.
Claim 23
Dependent Claim
46 words
The method of claim 16, wherein said step of modifying said speed reference signal to account fo droop generates an adjusted speed reference signal and wherein said step of modifying said speed reference signal to account for speed error comprises modifying said adjusted speed reference signal.
Claim 24
Dependent Claim
33 words
The method of claim 9, further comprising the step of enabling the steps of modifying the speed reference signal to account for droop and speed error on the occurrence of a prescribed event.
Claim 25
Dependent Claim
33 words
The method of claim 20, wherein said combustion turbine includes a generator breaker for connecting said generator to a power system and wherein said prescribed event is the closing of said generator breaker.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-03-10 | 1995-09-09 | 1996-03-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-03-10 | 1999-09-09 | 2000-03-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-03-10 | 2003-09-09 | 2004-03-10 | $7700.00 | Window Closed / Lapsed |