Steam turbine fuzzy logic cyclic control method and apparatus therefor
First Claim
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.
3 Assignments
0 Petitions
Accused Products
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.
58 Citations
27 Claims
-
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. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
-
-
10. A method for controlling a turbine in a steam plant using fuzzy logic such that future projected load demand is considered in determining current turbine control action so as to respond to cycling loads in an optimal fashion, the method comprising the steps of:
-
comparing current turbine loading with selected composite electrical-load cycle profiles to generate a load error signal, each of said electrical cycle profiles comprising multiple sequential load stages corresponding to phases of a predicted turbine loading profile; generating weighted operating constraints by means of a fuzzy inference calculation in correspondence with selected ones of said electrical cycle profiles; producing control signals for selected steam plant regulatory functions by applying said weighted operating constraints and said load error signal so as to optimize turbine load-following efficacy, steam plant efficiency, and machinery stress reduction; and applying the steam plant regulatory control signals to respective regulatory function actuators in said steam plant. - View Dependent Claims (11, 12, 13, 14, 15, 16, 17, 18, 19, 20)
-
-
21. A steam plant controller for controlling cyclic operation of the steam plant in response to changes in electrical load demand on a turbine generator unit in said plant, comprising:
-
a boiler controller comprising means for selectively adjusting the steam pressure delivered to said turbine generator unit; a steam supply control apparatus coupled to said turbine generator unit so as to selectively control the amount of steam admitted into the turbine; and a steam plant cyclic controller coupled to said boiler controller and said steam supply control apparatus, said steam plant cyclic controller comprising means for generating control signals for said boiler controller and said steam supply control apparatus so that selected steam plant operation parameters are optimized with respect to an anticipated load profile by means of a fuzzy inference calculation. - View Dependent Claims (22, 23, 24, 25, 26, 27)
-
Specification