CN109581923B - Water supply control system for nuclear power station - Google Patents
Water supply control system for nuclear power station Download PDFInfo
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- CN109581923B CN109581923B CN201811476758.7A CN201811476758A CN109581923B CN 109581923 B CN109581923 B CN 109581923B CN 201811476758 A CN201811476758 A CN 201811476758A CN 109581923 B CN109581923 B CN 109581923B
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B19/00—Programme-control systems
- G05B19/02—Programme-control systems electric
- G05B19/04—Programme control other than numerical control, i.e. in sequence controllers or logic controllers
- G05B19/042—Programme control other than numerical control, i.e. in sequence controllers or logic controllers using digital processors
- G05B19/0421—Multiprocessor system
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- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05B—CONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
- G05B2219/00—Program-control systems
- G05B2219/20—Pc systems
- G05B2219/24—Pc safety
- G05B2219/24182—Redundancy
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Abstract
The invention provides a nuclear power station feedwater control system, which comprises: a field device, at least one converter card, and a control system; the at least one conversion card is connected between the field device and the control system and used for transmitting a control signal from the control system to the field device and receiving a detection signal from the field device; each conversion card comprises a main I/O card and a redundant I/O card; the main I/O card and the redundant I/O card are respectively connected between the field equipment and the control system; when the main I/O card and the redundant I/O card work normally, the main I/O card and the redundant I/O card divide the input/output signals equally; when one of the primary or redundant I/O cards fails, the I/O value of the other card doubles. Compared with the prior art, the nuclear power station feedwater control system provided by the invention has stronger stability and reliability.
Description
Technical Field
The invention relates to the technical field of nuclear power stations, in particular to a nuclear power station water supply control system.
Background
High reliability is a first requirement of process control systems. Redundancy is a technique often used in the design of computer system reliability and is one of the most effective methods for improving the reliability of computer systems. In order to achieve the goal of high reliability and low failure rate, redundancy technology is usually adopted in the design and application of the control system.
At present, in a control system in most industries, a redundancy technology is implemented for key components such as a power supply and a network, and reliability and stability of the system are improved by adopting I/O (Input/Output) card redundancy, wherein the I/O cards are classified according to purposes and may include an ai (analog Input) card, an ao (analog Output) card, a di (digital Input) card, and a do (digital Output) card. However, in the control system of the nuclear power plant, only the controller realizes redundancy, and the redundancy technology of the I/O card is not adopted to improve the reliability and stability of the system.
In view of the above, there is a need to provide a new feedwater control system for nuclear power plants to overcome the above-mentioned drawbacks.
Disclosure of Invention
The invention aims to: the defects of the prior art are overcome, and the nuclear power station water supply control system with high reliability and stability is provided.
The invention provides a nuclear power station feedwater control system, which comprises field equipment, at least one conversion card and a control system, wherein the field equipment is connected with the conversion card; the at least one conversion card is connected between the field device and the control system and used for transmitting a control signal from the control system to the field device and receiving a detection signal from the field device; each conversion card comprises a main I/O card and a redundant I/O card; the main I/O card and the redundant I/O card are respectively connected between the field device and the control system; when the main I/O card and the redundant I/O card work normally, the main I/O card and the redundant I/O card divide input/output signals evenly; when one of the primary I/O cartridge or the redundant I/O cartridge fails, the input/output value of the other I/O cartridge is doubled.
As an improvement of the nuclear power station feedwater control system, the main I/O card can be communicated with the redundant I/O card, and the main I/O card and the redundant I/O card have self-diagnosis functions; when one of the main I/O card or the redundant I/O card has a fault, the I/O card with the fault interrupts the input/output of the I/O card and sends the fault information to the other I/O card, and the other I/O card doubles the input/output of the I/O card after receiving the fault information.
As an improvement of the nuclear power station feedwater control system, the field device is used for collecting feedwater parameters of a feedwater system under the working conditions of unit starting, hot standby, power operation and shutdown, supplying water to the secondary side of the steam generator and maintaining the water level of the secondary side of the steam generator.
As an improvement of the nuclear power station feedwater control system of the present invention, the field device includes a main feedwater regulating valve and a startup feedwater regulating valve; the nuclear power station water supply control system comprises two conversion cards, wherein the main water supply regulating valve and the starting water supply regulating valve correspond to one conversion card respectively.
As an improvement of the nuclear power station feedwater control system, the I/O clamping pieces and the redundant I/O clamping pieces are AO clamping pieces.
As an improvement of the nuclear power station feedwater control system, the control system comprises a main controller, a redundancy controller and a terminal module; the main controller is respectively connected with each main I/O card and each redundant I/O card, and is used for receiving and processing the detection signal and generating a control signal according to the control instruction; the redundancy controller is respectively connected with each main I/O card and each redundancy I/O card, is used for receiving and processing detection signals when the main controller is overloaded or fails, and is also used for generating control signals according to control instructions; the terminal module is connected with the main controller and the redundancy controller through Ethernet and used for generating a control instruction according to a processing result of the detection signal; the main controller is also used for starting the redundant controller when the main controller is overloaded or fails.
According to the nuclear power station water supply control system provided by the invention, when the main I/O card and the redundant I/O card work normally, the main I/O card and the redundant I/O card divide input/output signals equally; when one I/O card of the main I/O card or the redundant I/O card has a fault, the other I/O card can automatically double the input/output value to reach the normal input/output value, so that the normal control of the field equipment is realized, and the reliability and the stability of the system are improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a nuclear power plant feedwater control system according to an embodiment of the present invention.
Fig. 2 is a schematic structural diagram of a nuclear power plant feedwater control system according to another embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "first", "second" and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implying any number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature.
In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
Please refer to fig. 1, which is a schematic structural diagram of a nuclear power plant feedwater control system 100 according to an embodiment of the present invention. The nuclear power plant feedwater control system 100 includes field devices 10, at least one conversion card 20, and a control system 30.
The field device 10 is configured to collect water supply parameters of the water supply system under the operating conditions of unit startup, hot standby, power operation, and shutdown, and supply water to the secondary side of the steam generator to maintain the water level of the secondary side of the steam generator.
At least one converter card 20 is connected between field device 10 and control system 30 for transmitting control signals from control system 30 to field device 10 and for receiving detection signals from field device 10. It will be appreciated that the converter card 20 will be primarily responsible for receiving the analog and digital signals transmitted by the field device 10 and then converting them to digital signals that can be received by the control system 30, as well as converting the control signals sent by the control system 30 to analog and digital signals to the field device 10.
Specifically, each converter card 20 includes a primary I/O (Input/Output) card 21 and a redundant I/O card 22. A primary I/O card 21 and a redundant I/O card 22 are connected between the field device 10 and the control system 30, respectively, i.e. the primary I/O card 21 is connected between the field device 10 and the control system 30, respectively, and the redundant I/O card 22 is also connected to the field device 10 and the control system 30, respectively. When the main I/O card 21 and the redundant I/O card 22 both work normally, the input/output signals of the main I/O card 21 and the redundant I/O card 22 are equally divided, that is, the input/output values of the main I/O card 21 and the redundant I/O card 22 are half of the total value. When one of the primary I/O card 21 or the redundant I/O card 22 fails, the input/output value of the other I/O card is doubled to reach the normal input/output value, thereby realizing the normal control of the field device 10.
According to the nuclear power station water supply control system 100 provided by the invention, when the nuclear power station water supply control system 100 works normally, the input/output signals are evenly divided by the main I/O clamping piece 21 and the redundant I/O clamping piece 22; when one I/O card of the main I/O card 21 or the redundant I/O card 22 has a fault, the other I/O card can automatically double the input/output value to reach the normal input/output value, so that the normal control of the field device 10 is realized, and the reliability and the stability of the system are improved.
In one embodiment, the main I/O card 21 can communicate with the redundant I/O card 22, and both the main I/O card 21 and the redundant I/O card 22 have self-diagnosis functions, when one of the main I/O card 21 or the redundant I/O card 22 fails, the failed I/O card interrupts its input/output and transmits failure information to the other I/O card, and the other I/O card doubles its input/output quickly after receiving the failure information. Because the main I/O card 21 and the redundant I/O card 22 both have self-diagnosis functions and can communicate with each other, the transmission efficiency of fault information is improved, the response speed of the system is increased, and the reliability of the system is further improved.
Referring to fig. 2, a schematic structural diagram of a nuclear power plant feedwater control system 100 according to another embodiment of the present invention is shown. Specifically, field device 10 includes a main feedwater regulating valve 11 and an activated feedwater regulating valve 12. The nuclear power plant feedwater control system 100 includes two converter cards 20, wherein the main feedwater regulating valve 11 and the start-up feedwater regulating valve 12 correspond to one converter card 20, respectively, that is, the number of the converter cards 20 included in the nuclear power plant feedwater control system 100 is determined according to the number of the field devices 10.
The I/O cards may be classified according to their applications, and include AI (Analog Input) cards, AO (Analog Output) cards, DI (Digital Input) cards, and DO (Digital Output) cards. In the present embodiment, both the I/O card 21 and the redundant I/O card 22 are AO cards.
In this embodiment, the nuclear power plant water supply system 100 is mainly located in a steam turbine plant of a nuclear power plant, and is divided into a main water supply system and a start water supply system; among them, the water feed path passing through the principal water feed adjusting valve 11 is called principal water feed; the feed water path through the start-up regulating valve 12 is referred to as start-up feed water.
Specifically, field device 10 further includes a main feed water pump (not shown) that operates normally to supply water to the steam generator from a main feed water path when the power plant is operating, a pressure gauge (not shown), a flow gauge (not shown), and the like; during operation, main water supply parameters such as main water supply flow, wide-range/narrow-range liquid level of a steam generator, water supply temperature, steam flow, steam pressure value and the like are measured through a pressure meter, a flow meter and other instruments, converted into detection signals and transmitted to the control system 30 through corresponding I/O clamping pieces; then the control system 30 transmits the control signal to the main water supply regulating valve 11 through the corresponding I/O clamping piece, and controls the main water supply regulating valve 11 to regulate the main water supply flow, so that the liquid level of the steam generator is maintained in a certain range.
When the flow meter detects that the main water supply flow is lower than a preset value, the control system 30 sends a control signal, closes the main water supply regulating valve 11, opens the starting water supply regulating valve 12, and supplies water to the steam generator by the starting water supply system.
Further, in one embodiment, the control system includes a primary controller 31, a redundant controller 32, and a termination module 33.
The main controller 31 is connected to each main I/O card 21 and each redundant I/O card 22, respectively, for receiving and processing the detection signals, and for generating control signals according to the control instructions.
The redundancy controller 32 is connected to each of the primary I/O cards 21 and each of the redundant I/O cards 22, respectively, for receiving and processing the detection signals when the primary controller 31 is overloaded or fails, and for generating control signals according to control instructions.
The terminal module 33 is connected to the main controller 31 and the redundant controller 32 via ethernet, and is configured to generate a control instruction according to a processing result of the detection signal.
Further, the main controller 31 is also used to activate the redundant controller 32 when it is overloaded or fails. In this embodiment, when the main controller 31 fails, the redundant controller 32 can be activated to operate, thereby further improving the stability and reliability of the system.
It should be understood that the above-mentioned serial numbers of the embodiments of the present invention are merely for description and do not represent the merits of the embodiments.
It should be noted that: the nuclear power plant feedwater system 100 provided in the foregoing embodiments is only illustrated by dividing the above functional modules, and in practical applications, the above functions may be distributed by different functional modules according to needs, that is, the internal structure of the equipment is divided into different functional modules to complete all or part of the above described functions.
The above description is only an embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications of equivalent structures and equivalent processes, which are made by using the contents of the present specification and the accompanying drawings, or directly or indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (6)
1. A nuclear power station feedwater control system is characterized by comprising field equipment, at least one conversion card and a control system; the at least one conversion card is connected between the field device and the control system and used for transmitting a control signal from the control system to the field device and receiving a detection signal from the field device; each conversion card comprises a main I/O card and a redundant I/O card; the main I/O card and the redundant I/O card are respectively connected between the field device and the control system; when the main I/O card and the redundant I/O card work normally, the main I/O card and the redundant I/O card divide input/output signals evenly; when one of the primary I/O cartridge or the redundant I/O cartridge fails, the input/output value of the other I/O cartridge is doubled.
2. The nuclear power plant feedwater control system of claim 1, wherein the primary I/O card is capable of communicating with the redundant I/O card, and the primary I/O card and the redundant I/O card each have a self-diagnostic function; when one of the main I/O card or the redundant I/O card has a fault, the I/O card with the fault interrupts the input/output of the I/O card and sends the fault information to the other I/O card, and the other I/O card doubles the input/output of the I/O card after receiving the fault information.
3. The nuclear power plant feedwater control system of claim 1 or 2 wherein the field devices are configured to collect feedwater parameters of the feedwater system during unit start-up, hot standby, power operation, and shutdown conditions, and to supply water to the secondary side of the steam generator to maintain a water level at the secondary side of the steam generator.
4. The nuclear power plant feedwater control system of claim 3, wherein the field devices include a main feedwater regulating valve and a start-up feedwater regulating valve; the nuclear power station water supply control system comprises two conversion cards, wherein the main water supply regulating valve and the starting water supply regulating valve correspond to one conversion card respectively.
5. The nuclear power plant feedwater control system of claim 4, wherein: the I/O cards and the redundant I/O cards are AO cards.
6. The nuclear power plant feedwater control system of claim 1, wherein: the control system comprises a main controller, a redundancy controller and a terminal module; the main controller is respectively connected with each main I/O card and each redundant I/O card, and is used for receiving and processing the detection signal and generating a control signal according to the control instruction; the redundancy controller is respectively connected with each main I/O card and each redundancy I/O card, is used for receiving and processing detection signals when the main controller is overloaded or fails, and is also used for generating control signals according to control instructions; the terminal module is connected with the main controller and the redundancy controller through Ethernet and used for generating a control instruction according to a processing result of the detection signal; the main controller is also used for starting the redundant controller when the main controller is overloaded or fails.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811476758.7A CN109581923B (en) | 2018-12-05 | 2018-12-05 | Water supply control system for nuclear power station |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201811476758.7A CN109581923B (en) | 2018-12-05 | 2018-12-05 | Water supply control system for nuclear power station |
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| CN109581923A CN109581923A (en) | 2019-04-05 |
| CN109581923B true CN109581923B (en) | 2021-10-15 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102426863A (en) * | 2011-10-31 | 2012-04-25 | 中广核工程有限公司 | Signal transmission system and method of reactor in nuclear station |
| CN104360676A (en) * | 2014-09-12 | 2015-02-18 | 中广核工程有限公司 | Signal output setting method and system of nuclear station CPUs (central processing units) in parallel redundancy mode |
| CN104681111A (en) * | 2015-01-08 | 2015-06-03 | 中国核电工程有限公司 | Auxiliary water supply flow segmented regulation control method |
| CN106506080A (en) * | 2016-10-10 | 2017-03-15 | 中广核工程有限公司 | A kind of field bus system and method based on nuclear power station water supply system |
| CN106710653A (en) * | 2016-12-05 | 2017-05-24 | 浙江大学 | Real-time data abnormal diagnosis method for monitoring operation of nuclear power unit |
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2018
- 2018-12-05 CN CN201811476758.7A patent/CN109581923B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102426863A (en) * | 2011-10-31 | 2012-04-25 | 中广核工程有限公司 | Signal transmission system and method of reactor in nuclear station |
| CN104360676A (en) * | 2014-09-12 | 2015-02-18 | 中广核工程有限公司 | Signal output setting method and system of nuclear station CPUs (central processing units) in parallel redundancy mode |
| CN104681111A (en) * | 2015-01-08 | 2015-06-03 | 中国核电工程有限公司 | Auxiliary water supply flow segmented regulation control method |
| CN106506080A (en) * | 2016-10-10 | 2017-03-15 | 中广核工程有限公司 | A kind of field bus system and method based on nuclear power station water supply system |
| CN106710653A (en) * | 2016-12-05 | 2017-05-24 | 浙江大学 | Real-time data abnormal diagnosis method for monitoring operation of nuclear power unit |
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