Steam turbine generator control system
First Claim
1. A control system for a steam turbine operative to drive an electric generator and having a plurality of steam admission valves which are controllable in position to determine the operating level of the turbine, comprising:
- (A) a controller including programmable digital computer means operable to receive and store input target set point signals and being responsive to said signals to generate a plurality of digital valve control signals;
(B) each said steam admission valve including a valve actuation circuit operable, in response to a valve position control signal, to position the valve so as to control its degree of opening;
(C) position detection means coupled to each said valve to provide respective feedback signals indicative of valve position;
(D) a plurality of valve position control circuits each including programmable digital computer means operable to receive and store a respective one of said digital valve control signals as well as a respective one of said feedback signals and being responsive to said digital valve control and feedback signals to generate a respective one of said valve position control signals; and
(E) said programmable digital computer means of said valve position control circuit being additionally operable to transmit selected stored digital information back to said controller.
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Accused Products
Abstract
A turbine control system which includes dual controllers having microcomputer processing circuits and capable of transmitting and receiving digital information to and from a plurality of valve position control circuits, also including their own microcomputer circuitry for controlling turbine steam admission valves. An operator'"'"'s panel provides for two levels of automatic control as well as a manual backup which is communicative directly with all of the valve position control circuits. Overspeed protection control as well as fast valving is provided by redundant speed control circuits.
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Citations
36 Claims
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1. A control system for a steam turbine operative to drive an electric generator and having a plurality of steam admission valves which are controllable in position to determine the operating level of the turbine, comprising:
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(A) a controller including programmable digital computer means operable to receive and store input target set point signals and being responsive to said signals to generate a plurality of digital valve control signals; (B) each said steam admission valve including a valve actuation circuit operable, in response to a valve position control signal, to position the valve so as to control its degree of opening; (C) position detection means coupled to each said valve to provide respective feedback signals indicative of valve position; (D) a plurality of valve position control circuits each including programmable digital computer means operable to receive and store a respective one of said digital valve control signals as well as a respective one of said feedback signals and being responsive to said digital valve control and feedback signals to generate a respective one of said valve position control signals; and (E) said programmable digital computer means of said valve position control circuit being additionally operable to transmit selected stored digital information back to said controller. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31)
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32. A steam turbine-generator power plant comprising:
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(A) a steam turbine having a high pressure section and at least a lower pressure section; (B) an electric generator rotated by said turbine to generate electric power when connected to a load; (C) means for providing motive steam; (D) a plurality of steam admission valves for controllably admitting said steam to said turbine; (E) a reheater section in the steam flow path between said high and lower pressure turbine sections; (F) interceptor valve means for admitting reheated steam to said lower pressure turbine section; (G) a controller including programmable digital computer means operable to receive and store input target set point signals being responsive to said signals to generate a plurality of digital valve control signals; (H) each said steam admission valve including a valve actuation circuit operable, in response to a valve position control signal, to position the valve so as to control its degree of opening; (I) position detection means coupled to each said valve to provide respective feedback signals indicative of valve position; (J) means for providing a turbine speed indicative signal; (K) an overspeed protection controller circuit including programmable digital computer means responsive to said turbine speed indicative signal and operable to provide a first RPM turbine speed signal; (L) means, when said generator is connected to said load, to derive an MW load signal; (M) said overspeed protection controller circuit being responsive to said MW signal and a predetermined turbine pressure condition to control the closing and any subsequent opening of said interceptor valve means. PG,72 - View Dependent Claims (33)
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34. A control system for a steam turbine operative to drive an electric generator and having a plurality of steam admission valves which are controllable in position to determine the operating level of the turbine, comprising:
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(A) a controller including programmable digital computer means operable to receive and store input target set point signals and being responsive to said signals to generate a plurality of digital valve control signals; (B) each said steam admission valve including a valve actuation circuit operable, in response to a valve position control signal, to position the valve so as to control its degree of opening; (C) position detection means coupled to each said valve to provide respective feedback signals indicative of valve position; (D) a plurality of valve position control circuits each including programmable digital computer means operable to receive and store a respective one of said digital valve control signals as well as a respective one of said feedback signals and being responsive to said digital valve control and feedback signals to generate a respective one of said valve position control signals; (E) said control system being operable in a selective one of a manual or automatic mode of operation; (F) manual input means operable, when in said manual mode of operation, to modify the values of said stored digital valve control signals of all of said valve position control circuits; (G) said programmable digital computer means of said valve position control circuits being operable to transmit its respective modified control signal back to said controller. - View Dependent Claims (35)
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36. A control system for a steam turbine operative to drive an electric generator and having a plurality of steam admission valves which are controllable in position to determine the operating level of the turbine, comprising:
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(A) a controller including programmable digital computer means operable to receive and store input target set point signals and being responsive to said signals to generate a plurality of digital valve control signals; (B) each said steam admission valve including a valve actuation circuit operable, in response to a valve position control signal, to position the valve so as to control its degree of opening; (C) position detection means coupled to each said valve to provide respective feedback signals indicative of valve position; (D) a plurality of valve position control circuits each including programmable digital computer means operable to receive and store a respective one of said digital valve control signals as well as a respective one of said feedback signals and being responsive to said digital valve control and feedback signals to generate a respective one of said valve position control signals; (E) a plurality of transducers positioned to provide respective output signals indicative of turbine speed; (F) a plurality of overspeed protection controller circuits each including programmable digital computer means operable to provide a presumed valid RPM turbine speed signal in response to at least a respective one of said transducer output signals and the presumed valid RPM turbine speed signal from at least one other overspeed protection controller circuit of said plurality. (G) said programmable digital computer means of an overspeed protection controller circuit, being in digital communication with said controller and being operable to transmit said presumed valid RPM turbine speed signal back to said controller.
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Specification