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 Title: |
US5517424:
Steam turbine fuzzy logic cyclic control method and apparatus therefor
[ Derwent Title ]
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| Country: |
US United States of America
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| Inventor: |
Marcelle, Kenneth A. W.; Schenectady, NY
Chiang, Kenneth H.; Schenectady, NY
Houpt, Paul K.; Schenectady, NY
Bonissone, Piero P.; Schenectady, NY
Weiss, Joseph; Cupertino, CA
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| Assignee: |
Electric Power Research Institute, Inc.
other patents from ELECTRIC POWER RESEARCH INSTITUTE, INC. (167035) (approx. 834)
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| Published / Filed: |
1996-05-14
/ 1994-03-31
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| Application Number: |
US1994000221746
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| IPC Code: |
Advanced:
H02J 3/00;
Core:
more...
IPC-7:
H02J 3/12;
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| ECLA Code: |
H02J3/00;
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| U.S. Class: |
Current:
700/287;
060/645;
290/052;
307/039;
706/900;
706/907;
Original:
364/494;
395/900;
395/907;
307/039;
060/645;
290/052;
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| Field of Search: |
364/492,494
060/660,646,645
376/217
395/003,61,900,906,907
307/038-41
290/052
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| Priority Number: |
| 1994-03-31 |
US1994000221746 |
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| Abstract: |
A method for automated control of a steam turbine during cyclic operation includes the steps of comparing current turbine loading with an anticipated load profile to generate a load error signal. Anticipated electrical load profiles correspond to the time of day, day of the week, month of the year, and historical data; operator input can vary such historical profiles as appropriate for unusual situations. The predicted load profile is categorized with respect to selected composite electrical load cycle profiles; weighted operating constraints are generated by means of a fuzzy inference calculation using electrical cycle profiles selected to correspond to the anticipated electrical load profile. Control signals for selected steam plant regulatory functions, such as steam supply valve position and boiler pressure, are produced by applying the fuzzy logic-generated weighted operating constraints and the load error signal so as to optimize turbine load-following efficacy, steam plant efficiency, and machinery stress reduction. These control signals are then applied to respective regulatory function actuators in the steam plant to implement the desired trajectory of steam plant operation.
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| Attorney, Agent or Firm: |
Flehr, Hohbach, Test, Albritton & Herbert ;
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| Primary / Asst. Examiners: |
Voeltz, Emanuel T.; Choi, Kyle J.
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| Maintenance Status: |
E3 Expired Check current status
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| INPADOC Legal Status: |
Show legal status actions
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| Family: |
None
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First Claim:
Show all 27 claims |
What is claimed is:
1. A method using fuzzy logic for cyclic operation control of a steam turbine, the method comprising the steps of:
- categorizing current turbine operation with respect to selected composite electrical-load cycle profiles, each of said electrical-load cycle profiles comprising multiple sequential load stages corresponding to phases of a predicted turbine loading profile; and
- producing control signals for selected steam plant regulatory functions by means of a fuzzy inference calculation in accordance with the categorization of turbine operation with respect to said selected composite electrical-load cycle profiles such that turbine operation is optimized.
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| Background / Summary: |
Show background / summary
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| Drawing Descriptions: |
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| Description: |
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| Forward References: |
Show 14 U.S. patent(s) that reference this one
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| Foreign References: |
None
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| Other Abstract Info: |
DERABS G96-251303
DERG96-251303
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| Other References: |
Mamdani E. H., et al., "Application of fuzzy algorithms for control of simple dynamic plant," Proceedings of IEE: Control & Science, vol. 121, No. 12, Dec. 1974, pp. 1585-1588.
(4 pages)
Cited by 15 patents
Matsumoto, H., et al., "An operation support expert system based on on-line dynamics simulation and fuzzy . . . ," IEEE Trans. on Energy Conversion., vol. 8, No. 4, Dec. 1993, pp. 674-680.
(7 pages)
[ISI abstract]
A. Khotanzad, R.-C. Hwang, and D. Maratukulam, "Hourly Load Forecasting by Neural Networks," in IEEE Power Engineering Society Winter Meeting, (Columbus, OH), Feb. 1993.
A F. Armor, R. D. Hottenstein, I. A. Diaz-Tous, and N. F. Lansing, "Cycling Capabilty of Supercritical Turbines: A World Wide Assessment," in Fossil Plant Cycling Workshop, (Miami Beach, FL), 1985.
F. J. Hanzalek and P. G. Ipsen, "Boiler-Turbine Coordination during Startup and Loading of Large Units," in American Society of Mechanical Engineers, (Chicago, IL), Nov. 7-11, 1965.
J. Jelinek, "Cycling controllers for electric utilities," in EPRI Conference on Power Plan Controls and Automation, 1989.
K. Anderson, "Advanced control technology to reduce power plant stress," in ASME Publication, Paper #90-JPGC/Pwr-2, Boston, MA, Oct. 1990.
D. B. P. Gibbs, "Nonlinear model predictive control for fossil power plants," in Proc. American Control Conf., pp. vol. 4, pp. 3091-3098, Chicago, IL, Jun. 1992.
D. P. B. P. Gibbs, D. S. Weber, "Application of nonlinear model-based predictive control to fossil power plants," in Proc. 30th IEEE Conf. on Decision and Control, Dec. 1992.
H. F. Martin and J. G. J. Silvestri, "Turbine Cycle Performance Optimization," in EPRI Heat Rate Improvement Conference, (Richmond, VA), May 10-12 (1988).
C. C. Lee, "Fuzzy Logic in Control Systems: Fuzzy Logic Controller I and II," IEEE Systems, Man, and Cybernetics, vil. 20, No. 2, 1990.
C. E. Garcia and A. Morshedi, "Quadratic Programming Solution of Dynamic Matrix Control (QDMC)." Chem. Eng. Comun., vol. 46, pp. 073-087, 1986.
(15 pages)
Cited by 4 patents
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