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US5953238A
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Method for generating control system setpoints with implicit dependencies
Assignee: General Electric Co
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Filing: 1996-03-12
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Granted: 1999-09-14
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Expires: 2016-03-12
Abstract
Abstract A method for modeling linear control systems that are asymptotically stable provided that any initial deviation is within a definite bound is described. The method includes the steps of generating a parametric model of the quasi steady state system, generating a time-invariant parametric mapping function, using the system model, to relate a system setpoint parameter at a system setpoint function to an input process parameter implicit in a system implicit parameter, and generating an interface protocol to adjust the time-invariant parametric mapping function to account for any time-dependent variations in the relative performance between the input process parameter and the implicit system parameter.
Inventors
- 👤 Christofer M. Mowry
- 👤 Israel Nir
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:13
CPC Classifications
G; G05; G05B; G05B17/00; G05B17/02
Claims Analysis
Total Claims: 27
Claim 1
Independent Claim
62 words
A method for generating a system setpoint reference function for a boiling water reactor system, said method comprising the steps of: generating a parametric model of the system; defining a time-invariant parametric mapping function; and generating an interface protocol to adjust the time-invariant parametric mapping function to account for any time-dependent variations between an input process parameter and an implicit system parameter.
Claim 2
Independent Claim
62 words
A method for generating a system setpoint reference function for a boiling water reactor system, said method comprising the steps of: generating a parametric model of the system; defining a time-invariant parametric mapping function; and generating an interface protocol to adjust the time-invariant parametric mapping function to account for any time-dependent variations between an input process parameter and an implicit system parameter.
Claim 3
Dependent Claim
28 words
A method in accordance with claim 1 wherein the system implicit parameter, a system setpoint parameter, and the input process parameter are utilized in generating the parametric model.
Claim 4
Dependent Claim
39 words
A method in accordance with claim 1 wherein the mapping function is generated using the parametric model to relate a system setpoint parameter at a system setpoint function to the input process parameter implicit in the system implicit parameter.
Claim 5
Dependent Claim
46 words
A method in accordance with claim 3 wherein relating the system setpoint parameter to the input process parameter comprises the step of collapsing a three dimensional system operating surface into a two-dimensional space defined by the control system input process parameter and the system setpoint parameter.
Claim 6
Dependent Claim
22 words
A method in accordance with claim 4 wherein collapsing the three dimensional system operating surface is performed along the system setpoint function.
Claim 7
Independent Claim
106 words
A method for generating a system setpoint reference function for a boiling water reactor system, said method comprising the steps of: generating a parametric model of the system using a system implicit parameter, x 1 , a system setpoint parameter, x 2 , and an input process parameter, X 3 , wherein a system operating surface is described by the relationship of x 1 , x 2 , and x 3 ; defining a time-invariant parametric mapping function; and generating an interface protocol to adjust the time-invariant parametric mapping function to account for any time-dependent variations between the input process parameter and the system implicit parameter.
Claim 8
Independent Claim
106 words
A method for generating a system setpoint reference function for a boiling water reactor system, said method comprising the steps of: generating a parametric model of the system using a system implicit parameter, x 1 , a system setpoint parameter, x 2 , and an input process parameter, X 3 , wherein a system operating surface is described by the relationship of x 1 , x 2 , and x 3 ; defining a time-invariant parametric mapping function; and generating an interface protocol to adjust the time-invariant parametric mapping function to account for any time-dependent variations between the input process parameter and the system implicit parameter.
Claim 9
Dependent Claim
54 words
A method in accordance with claim 6 wherein the system operating surface is defined as: S(x.sub.1, x.sub.2, x.sub.3)=Constant, where parameter x 1 is the system implicit parameter and is an independent variable of a system setpoint function, parameter x 2 is the system setpoint parameter, and parameter x 3 is the input process parameter.
Claim 10
Dependent Claim
19 words
A method in accordance with claim 7 wherein the system setpoint function is defined as: x.sub.2 =g.sub.SSF (x.sub.1). 9.
Claim 11
Dependent Claim
33 words
A method in accordance with claim 8 wherein for a given value of the input process parameter, the system implicit parameter is directly related to the system setpoint parameter by: x.sub.1 =F(x.sub.2,x.sub.3 ').
Claim 12
Dependent Claim
16 words
A method in accordance with claim 9 wherein the parametric mapping function is: x.sub.1 =Ω.sub.PMF (x.sub.3).
Claim 13
Dependent Claim
18 words
A method in accordance with claim 10 wherein the setpoint reference function is: x.sub.2 =g.sub.SSF (Ω.sub.PMF (x.sub.3)). 12.
Claim 14
Dependent Claim
33 words
A method in accordance with claim 11 wherein generating an interface protocol comprises the step of defining an alignment reference trajectory inside the system operating envelope as: x.sub.2 =g.sub.ART (x.sub.1). x.sub.1 =f.sub.ART (x.sub.3).
Claim 15
Dependent Claim
29 words
A method in accordance with claim 12 wherein generating an interface protocol comprises the step of generating an alignment measured trajectory defined as: x.sub.2 =g.sub.ART (x.sub.1). x.sub.1 =f.sub.ART (x.sub.3).
Claim 16
Dependent Claim
44 words
A method in accordance with claim 13 wherein an alignment correction, Δ ALIGN , is established as a function of the measured input process parameter value (x 3 ), by conserving the implicit system parameter value, x 1 : f.sub.AMT (x.sub.3)=f.sub.ART (x.sub.3 =Δ.sub.ALIGN). 15.
Claim 17
Dependent Claim
38 words
A method in accordance with claim 14 wherein compensations for any system performance changes are incorporated by the alignment correction as: x.sub.2 =g.sub.SSF (Ω.sub.PMF (x.sub.3 =Δ.sub.ALIGN)), where x 3 is the measured value of the input process parameter.
Claim 18
Dependent Claim
66 words
A method in accordance with claim 15 wherein criterion for continued applicability of the parametric mapping function requires that the system model satisfies: ##EQU13## for any value of x' 3 , where ε is sufficiently small, and x 2 analytical and x 2 empirical refer to the analytical system model value and the measured value of the system setpoint parameter at a common x' 3 value.
Claim 19
Dependent Claim
48 words
A method in accordance with claim 16 wherein trajectories on the system operating surface are equivalent to empirical values of the input process parameter if: |x.sub.3.sup.empirical -x.sub.3.sup.analytical |.sub.x.sbsb.1 '.sub., x.sbsb.2 '≦δ, where x' 1 and x' 2 represent any common point and δ is defined consistent with ε.
Claim 20
Independent Claim
87 words
A method for determining reactor trip setpoints as a function of reactor coolant recirculation flow, said method comprising the steps of: generating a parametric model of the system, the parametric model including core flow, W T , core power, P, and recirculation drive flow, W D , related by: W.sub.T =f.sub.SURF (P, W.sub.D); and defining a time-invariant parametric mapping function as: ##EQU14## where a core flow value at the intersection of setpoint function i and reference power control line n, is designated as W T i ,n.
Claim 21
Independent Claim
87 words
A method for determining reactor trip setpoints as a function of reactor coolant recirculation flow, said method comprising the steps of: generating a parametric model of the system, the parametric model including core flow, W T , core power, P, and recirculation drive flow, W D , related by: W.sub.T =f.sub.SURF (P, W.sub.D); and defining a time-invariant parametric mapping function as: ##EQU14## where a core flow value at the intersection of setpoint function i and reference power control line n, is designated as W T i ,n.
Claim 22
Dependent Claim
14 words
A method in accordance with claim 18 wherein the trip reference function is: ##EQU15##20.
Claim 23
Independent Claim
82 words
A method for generating a system setpoint reference function for controlling a boiling water reactor system in a nuclear power plant, said method comprising the steps of: generating a parametric model of the system using a system implicit parameter, a system setpoint parameter, and an input process parameter; defining a time-invariant parametric mapping function; and generating an interface protocol to adjust the time-invariant parametric mapping function to account for any time-dependent variations between the input process parameter and the system implicit parameter.
Claim 24
Independent Claim
82 words
A method for generating a system setpoint reference function for controlling a boiling water reactor system in a nuclear power plant, said method comprising the steps of: generating a parametric model of the system using a system implicit parameter, a system setpoint parameter, and an input process parameter; defining a time-invariant parametric mapping function; and generating an interface protocol to adjust the time-invariant parametric mapping function to account for any time-dependent variations between the input process parameter and the system implicit parameter.
Claim 25
Dependent Claim
33 words
A method in accordance with claim 20 wherein the parametric model includes core flow, W T , core power, P, and recirculation drive flow, W D , related by: W.sub.T =f.sub.SURF (P, W.sub.D).
Claim 26
Dependent Claim
42 words
A method in accordance with claim 20 wherein the time-invariant parametric mapping function is defined as: ##EQU16## where a core flow value at the intersection of setpoint function i and reference power control line n, is designated as W T i ,n.
Claim 27
Dependent Claim
42 words
A method in accordance with claim 20 wherein the interference protocol produces a trip reference setpoint function defined as: ##EQU17## where P n i represents the core power value at the intersection of set point i and reference power control line n.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 2002-09-13 | 2003-03-15 | 2003-09-14 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2006-09-13 | 2007-03-15 | 2007-09-14 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2010-09-13 | 2011-03-15 | 2011-09-14 | $7700.00 | Window Closed / Lapsed |