NUCLEAR STEAM FEED CONTROL SYSTEM

Abstract

NUCLEAR STEAM SUPPLY CONTROL SYSTEM The present invention relates specifically to a nuclear steam supply control system, comprising: a monitoring control layer, which is used to generate field human-machine interaction signals, and to display field operation signals, field alarm signals and field human-machine interaction signals on a field human-machine interaction display; a field control layer, which is used to perform field alarm logic operations on the collected field operation signals in order to generate field alarm signals, and to perform field control logic operations on the field human-machine interaction signals in order to generate field control signals;and a field actuator, which is used to adjust the field operation signals according to the field control signals. The present invention enables field operators to monitor and control the operation of nuclear steam supply stations. Summary figure: Fig. 1;

Description

Title of the invention: NUCLEAR STEAM SUPPLY CONTROL SYSTEM technical field

[0001] The present invention relates to the technical field of nuclear steam supply control, and in particular a nuclear steam supply control system. STATE OF THE ART

[0002] The nuclear steam production plant adopts a steam conversion technology to produce industrial steam from the steam in the secondary circuit of the nuclear power plant, and then transport the industrial steam to user companies through the industrial steam pipeline network.

[0003] After the commissioning of the nuclear steam power plant, the two units will each operate at partial load during normal operation, and when one of the units is shut down, the other unit will ensure operation at full load.

[0004] In order to ensure the safe and stable operation of the nuclear steam power plant, it is necessary to design a nuclear steam production control system to carry out field monitoring and control of the nuclear steam power plant for the field monitoring and control needs of the nuclear steam power plant. SUMMARY

[0005] The object of the present invention is to provide an industrial steam supply control system for nuclear power plants enabling the operator of the nuclear steam supply station to monitor and control the operation of the nuclear steam supply station.

[0006] To achieve the above-mentioned objective, the present invention provides a nuclear steam feed control system to enable the operator to monitor and control the field operation of the nuclear steam feed station, comprising: a monitoring control layer, used by operators to perform field human-machine interaction on a field human-machine interaction display in order to generate field human-machine interaction signals and send them to a field control layer; receive field operation signals and field alarm signals sent by the field control layer; and display the field operation signals, the field alarm signals and field human-machine interaction signals on the field human-machine interaction display; The field control layer, used to collect field operation signals from a field actuator; perform field alarm logic operations on field operation signals to generate field alarm signals; send field operation signals and field alarm signals to the monitoring control layer; receive field human-machine interaction signals sent by the monitoring control layer; perform field control logic operations on field human-machine interaction signals to generate field control signals and send them to the field actuator; and the field actuator, used to receive field control signals sent by the field control layer, and adjust field operation signals according to the field control signals.

[0007] As one of the feasible ways, the field control layer includes an I / O (input / output) control cabinet, and the monitoring control layer includes an engineer station and a control station; The engineer's station is used to configure and compile the field human-machine interaction display to generate the field human-machine interaction display, configure and compile field control logic to generate the field control logic; configure and compile field alarm logic to generate the field alarm logic; upload the field control logic and field alarm logic to the control cabinet 1 / O, and upload the field human-machine interaction display to the control station; The control station is used to run the field human-machine interaction display, to perform field human-machine interaction by operators on the field human-machine interaction display in order to generate field human-machine interaction signals and send them to the I / O control cabinet, to receive field alarm signals and field operating signals sent by the I / O control cabinet, and to display field alarm signals, field operating signals and field human-machine interaction signals on the field human-machine interaction display; The I / O control cabinet is used to receive field human-machine interaction signals sent by the control station; perform field control logic operations on the field human-machine interaction signals to generate field control signals and send them to the field actuator; collect field operating signals from the field actuator; perform field alarm logic operations on the operating signals to generate field alarm signals; and send the field operating signals and alarm signals to the control station; and The field actuator is used to receive field control signals sent by the I / O control cabinet, and adjust the operating signals according to the control signals.

[0008] Among the feasible means, the I / O control cabinet is equipped with a Profibus DP bus, input and output modules and two controllers; the two controllers are configured in redundancy with respect to each other, one controller being a primary controller and the other controller being a standby controller; the two controllers are respectively connected via the Profibus DP bus to the input and output modules; and the input and output modules are connected to the field actuator; The engineer's station is used to synchronously download the field control logic and the field alarm logic to the main controller and the watch controller; The control station is used to synchronously send field human-machine interaction signals to the main controller and the watch controller; to receive field alarm signals and field operation signals sent by the main controller; to display field alarm signals and field operation signals sent by the main controller on the field human-machine interaction display; The field actuator is used to collect field operation signals and send them to the input and output modules; to receive field control signals sent by the input and output modules, and to adjust the field operation signals according to the field control signals; The input and output modules are used to receive field operation signals sent by the field actuator, and to synchronously send field operation signals to the main controller and the standby controller; to receive field control signals sent by the main controller and send them to the field actuator; The main controller is used to receive field human-machine interaction signals sent by the control station; to perform field control logic operations on the field human-machine interaction signals to generate field control signals and send them to the input and output modules; and to receive field operation signals sent by the actuator. field; to perform logical field alarm operations on field operation signals to generate field alarm signals; and to send field operation signals and field alarm signals to the control station; The standby controller is used to receive field human-machine interaction signals sent by the control station; to perform field control logic operations on the field human-machine interaction signals to generate field control signals; to receive field operation signals sent by the field actuator; to perform field alarm logic operations on the field operation signals to generate field alarm signals; and The main controller and the standby controller synchronously receive field human-machine interaction signals sent by the control station, synchronously perform field control logic operations on the field human-machine interaction signals to synchronously generate field control signals; synchronously receive field operation signals sent by the field actuator, synchronously perform field alarm logic operations on the field operation signals to synchronously generate field alarm signals.

[0009] Among the feasible means, the main controller and the standby controller exchange synchronization signals and signals for establishing a link at each operating cycle to ensure that the main controller and the standby controller are ready for data exchange; The standby controller follows the main controller via synchronization signals, and when the main controller fails or stops working, the main controller and the standby controller switch over without any problems.

[0010] Among the feasible means, monitoring circuits and fault self-checking circuits are provided in the main controller and the standby controller; When the main controller fails, the main controller's monitoring circuit is activated, and the standby controller is switched to the main controller, and the main controller is switched to the standby controller; and When the main controller ceases to function, the main controller's fault self-checking circuit is activated, and the standby controller is switched to the main controller, and vice versa.

[0011] Among the feasible means, field human-machine interaction includes the definition of analog and digital signals, and the signals field human-machine interaction include analog definition signals and digital definition signals; Field control signals and field operation signals include analog signals and digital signals; Analog signals include liquid level signals, pressure signals, temperature signals, and valve open position signals, and digital signals include pump standby activation signals and valve interlock signals; Analog definition signals include liquid level definition signals, pressure definition signals, temperature definition signals, and valve open position definition signals; and digital definition signals include pump standby activation order signals and valve interlock switching order signals.

[0012] Among the feasible means, the field human-machine interaction display device includes a field process flow diagram, in which field operation signals, field human-machine interaction signals and field alarm signals are displayed; In the field process flow diagram, a standby activation button is provided for pumps in redundancy between them, and a lockout button is provided for locked valves; by activating or deactivating the standby activation button for the pumps and confirming, the standby activation control signals for the pumps are generated; by activating or deactivating the lockout cutout button for the valves and confirming, the lockout switching control signals for the valves are generated; the logical field control operations are performed on the standby activation control signals of the pumps, and the standby activation signals of the pumps are generated according to the standby activation control signals of the pumps; The logical field control operations are performed on the valve lock cut-off setting signals, and the valve lock signals are generated according to the valve lock cut-off setting signals.

[0013] Among the feasible means, the field alarm signals include an analog high limit alarm signal and an analog low limit alarm signal; The execution of field alarm logic operations on field operation signals to generate field alarm signals includes the following steps: generating a low limit alarm signal from the analog signal when the analog signal is below a defined low limit; and generate a high limit alarm signal of the analog signal, when the analog signal is above a defined high limit.

[0014] Among the feasible means, the terrain control layer further includes a historical station; The control station is also used to send field alarm signals, field operation signals, and field human-machine interaction signals to the historical station; and The historical station is used to receive field alarm signals, field operation signals, and field human-machine interaction signals sent by the control station; and to store, maintain, and query field operation signals, field alarm signals, and field human-machine interaction signals.

[0015] Among the feasible means, the field control layer further includes a communication station; digital communication points and analog communication points are configured between the nuclear power plant and a nuclear unit; the communication station collects in real time the values ​​of the digital communication points and the analog communication points; the nuclear unit sends signal requests to the communication station according to a defined frequency; the communication station receives the signal requests sent by the nuclear unit and sends the signals requested by the nuclear unit back to the nuclear unit; the nuclear unit receives the signals sent by the communication station and organizes and enters them into a DCS (Distributed Control System) display of the nuclear unit; The signal requests sent by the nuclear unit are the values ​​of the digital communication points and the analog communication points.

[0016] Among the possible embodiments, the monitoring control layer further includes a printer and two ring networks; there are two control stations and two history stations, one control station serving as an engineer station and a history station, and the other control station serving as a communication station and the other as a history station; the field control layer further includes a network cabinet and two relays, there are four I / O control cabinets, two I / O control cabinets corresponding to a relay cabinet, and two switches are arranged in the network cabinet; The printer is connected to one of the ring networks, and each switch is connected to two ring networks respectively; each control station and each controller is equipped with two network cards segmented into two rings, each control station is connected to two ring networks respectively. and each controller is connected to two ring networks and two switches respectively.

[0017] Among the possible embodiments, the field control layer further includes an electrical distribution cabinet; the electrical distribution cabinet receives two AC power supplies; An AC power switching module is provided in the electrical distribution cabinet, and the electrical distribution cabinet switches the two AC power supplies received by the AC power switching module redundantly, and provides working power for the I / O control cabinets, the relay cabinet, the network cabinet, an operating table and the printer respectively; DC power conversion modules are provided in the I / O control cabinets, and the I / O control cabinets receive the AC power supplies provided by the electrical distribution cabinet, convert the AC power supplies to DC power supplies by the DC power conversion modules, and provide working power for the input and output modules in the I / O control cabinets.

[0018] The beneficial technical effects of this patent:

[0019] According to the nuclear steam power supply control system of this patent, a field human-machine interaction display shows field operation signals and field alarm signals, and the operator performs field human-machine interaction on the field human-machine interaction display, which is convenient for the operator to monitor and control the field operation; highly redundant design, a single failure does not affect the operation of the system; the main controller and the standby controller operate simultaneously, and the main controller outputs the operation results to ensure seamless switching between the main controller and the standby controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] [Fig.1] is a structural diagram of an embodiment of the nuclear steam supply control system of the present invention;

[0021] [Fig.2] is a diagram of the redundant operating principle of a mode of implementation of two controllers in one I / O controller;

[0022] [Fig.3] is a diagram of the communication between a communication station and a nuclear power plant; and

[0023] [Fig.4] is a diagram of an embodiment of a human-interaction display machine. DETAILED DESCRIPTION OF THE IMPLEMENTATION METHODS.

[0024] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those generally understood by persons competent in the field of this application. The terms used in the description of the application serve only to describe specific embodiments and are not intended to limit this application. The terms "including" and "providing," and any variations thereof, in the description and claims of this application and in the drawings mentioned above are intended to cover non-exclusive inclusions. The terms "first," "second," etc., in the description and claims of this application or in the drawings mentioned above are used to distinguish different objects, rather than to describe a specific order.

[0025] The reference to "embodiment" in this application means that the specific features, structures, or particularities described with reference to that embodiment may be included in at least one embodiment of this application. The appearance of this expression in various places in the description does not necessarily refer to the same embodiment, nor to an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those competent in the field that the embodiments described herein may be combined with other embodiments.

[0026] The technical solution of the present invention is described below clearly and completely with reference to the drawings and specific embodiments.

[0027] With reference to [Fig. 1], a structural diagram of an embodiment of a nuclear steam feed control system is shown. The nuclear steam feed control system is used by operators to monitor and control the field operation of a nuclear steam feed power plant, and comprises: a monitoring control layer, used by operators to perform field human-machine interaction on the field human-machine interaction display in order to generate field human-machine interaction signals and send them to a field control layer; receive field operating signals and field alarm signals sent by the field control layer; display the field operating signals, field alarm signals and field human-machine interaction signals on the field human-machine interaction display; The field control layer, used to collect field operation signals from a field actuator; perform field alarm logic operations on the field operation signals in order to generate field alarm signals; send field operation signals and field alarm signals to the monitoring control layer; receive field human-machine interaction signals sent by the monitoring control layer; perform field control logic operations on the field human-machine interaction signals to generate field control signals and send them to the field actuator; and the field actuator, used to receive the field control signals sent by the field control layer, and adjust the field operation signals according to the field control signals.

[0028] In this embodiment, as one of the feasible ways, the field control layer includes an I / O control cabinet; and the monitoring control layer includes an engineer station and a control station.

[0029] The engineer station is used to configure and compile the field human-machine interaction display to generate the field human-machine interaction display; configure and compile field control logic to generate the field control logic; configure and compile field alarm logic to generate the field alarm logic; upload the field control logic and field alarm logic to the I / O control cabinet, and upload the field human-machine interaction display to the control station.

[0030] The control station is used to run the field human-machine interaction display; to perform field human-machine interaction by operators on the field human-machine interaction display in order to generate field human-machine interaction signals and send them to the I / O control cabinet; to receive field alarm signals and field operation signals sent by the I / O control cabinet; and to display field alarm signals, field operation signals and field human-machine interaction signals on the field human-machine interaction display.

[0031] The I / O control cabinet is used to receive field human-machine interaction signals sent by the control station; perform field control logic operations on the field human-machine interaction signals in order to generate field control signals and send them to the field actuator; collect field operation signals from the field actuator; perform field alarm logic operations on the field operation signals in order to generate field alarm signals; and send the field operation signals and field alarm signals to the control station.

[0032] The field actuator is used to receive field control signals sent by the I / O control cabinet, and adjust the field operation signals according to the field control signals.

[0033] See [Fig.2], in this example, as one of the possible embodiments, a bus Profibus DP, an input / output module and two controllers are planned in the FO control cabinet.

[0034] The two controllers are configured in redundancy with respect to each other, one controller being a primary controller and the other a standby controller.

[0035] The two controllers are respectively connected via the Profibus DP bus to the input / output modules; and the input / output modules are connected to the field actuator.

[0036] The engineer station is used to synchronously upload field control logic and field alarm logic to the main controller and the standby controller.

[0037] The control station is used to synchronously send field human-machine interaction signals to the main controller and the standby controller; receive field alarm signals and field operation signals sent by the main controller; display field alarm signals and field operation signals sent by the main controller on the field human-machine interaction display.

[0038] The field actuator is used to collect field operation signals and send them to the input / output modules; receive field control signals sent by the input / output modules, and adjust the field operation signals according to the field control signals.

[0039] The input / output modules are used to receive field operation signals sent by the field actuator, and synchronously send field operation signals to the main controller and the standby controller; and receive field control signals sent by the main controller and send them to the field actuator.

[0040] The main controller is used to receive field human-machine interaction signals sent by the control station; perform field control logic operations on the field human-machine interaction signals in order to generate field control signals and send them to the input and output modules; receive field operation signals sent by the field actuator; perform field alarm logic operations on the field operation signals in order to generate field alarm signals; and send the field operation signals and field alarm signals to the control station.

[0041] The standby controller is used to receive field human-machine interaction signals sent by the control station; perform field control logic operations on the field human-machine interaction signals in order to generate field control signals; receive field operating signals sent by the field actuator; and perform field alarm logic operations on the field operating signals in order to generate field alarm signals.

[0042] The main controller and the standby controller simultaneously receive field human-machine interaction signals sent by the control station, simultaneously perform field control logic operations on the field human-machine interaction signals in order to simultaneously generate field control signals; simultaneously receive field operating signals sent by the field actuator, simultaneously perform field alarm logic operations on the field operating signals in order to simultaneously generate field alarm signals.

[0043] The controller's operational cycle is the time required for the controller to perform the following operations: receive field human-machine interaction signals sent by the control station; perform field control logic operations on the field human-machine interaction signals in order to generate field control signals; receive field operating signals sent by the field actuator; perform field alarm logic operations on the field operating signals in order to generate field alarm signals.

[0044] In this embodiment, as one of the feasible ways, the main controller and the standby controller exchange synchronization signals and signals for establishing a link in each operating cycle to ensure that the main controller and the standby controller are ready for data exchange.

[0045] The standby controller tracks the main controller via synchronization signals. When the main controller fails or stops working, the main controller and the standby controller switch over seamlessly when the standby controller is in normal operating condition, which will not affect the system.

[0046] In this embodiment, as one of the feasible ways, monitoring circuits and fault self-checking circuits are provided in both the main controller and the standby controller.

[0047] When the main controller fails, the main controller monitoring circuit is activated, and the standby controller is switched to the main controller, and the main controller is switched to the standby controller.

[0048] When the main controller stops working, the main controller's fault self-checking circuit is activated, and the standby controller is switched to the main controller, and the main controller is switched to the standby controller.

[0049] The failure of the main controller includes a hardware failure and a software failure.

[0050] In this embodiment, as one of the feasible ways, field human-machine interaction includes the definition of analog and digital signals, and field human-machine interaction signals include analog definition signals and digital definition signals.

[0051] Field control signals and field operation signals include both analog and digital signals.

[0052] Analog signals include liquid level signals, pressure signals, temperature signals and valve open position signals, and digital signals include pump standby activation signals and valve interlock signals.

[0053] Analog definition signals include liquid level definition signals, pressure definition signals, temperature definition signals and valve opening position definition signals.

[0054] The digital definition signals include standby pump activation order signals and valve interlock switching order signals.

[0055] With reference to [Fig.4], in this example embodiment, as one of the feasible ways, the field human-machine interaction display includes a field process flow diagram, in which field operation signals, field human-machine interaction signals and field alarm signals are displayed.

[0056] In the field process flow diagram, a standby activation button is provided for the pumps, which are redundant with each other. Activating the standby activation button indicates that the pump is in standby mode, and deactivating the standby activation button indicates that the pump is in main operation. Confirmation prompts are given for activating or deactivating the standby activation button. After confirmation to activate or deactivate the standby activation button, the pump standby activation control signals are generated. The valve The valve is equipped with a lock release button. Activating the valve's lock release button indicates that the valve is unlocked, and deactivating the button indicates that the valve is locked. Confirmation prompts are given for activating or deactivating the valve's lock release button. After confirmation to activate or deactivate the valve's lock release button, the valve lock switching control signals are generated.

[0057] The field control logic operations are performed on the pump standby activation control signals, and the pump standby activation signals are generated according to the pump standby activation control signals.

[0058] The field control logic operations are performed on the valve lock cutoff setting signals, and the valve lock signals are generated according to the valve lock cutoff setting signals.

[0059] In this embodiment example, as one feasible way, the field alarm signals include an analog high limit alarm signal and an analog low limit alarm signal.

[0060] The execution of field alarm logic operations on the field operation signals to generate the field alarm signals includes the following steps: generating a low limit alarm signal from the analog signal when the analog signal is below a set low limit value; and generation of a high limit alarm signal of the analog signal, when the analog signal is above a set high limit value.

[0061] In this embodiment, as one of the feasible ways, the engineer station is provided with a master engineering control software, where the master engineering control software integrates the functions of logic configuration, display configuration, compilation and downloading; the control station is provided with the operator's online monitoring software, and the field human-machine interaction display runs in the operator's online monitoring software.

[0062] The operator's online monitoring software runs the field human-machine interaction display so that the operator can monitor and control the field operation, so that the operator can understand field operation signals and field alarm signals at any time, and perform field human-machine interaction in the field human-machine interaction display in a timely manner to ensure the safe and stable operation of the field equipment.

[0063] In this embodiment, as one of the feasible ways, the terrain control layer further includes a history station.

[0064] The control station is further used to send field alarm signals, field operation signals and field human-machine interaction signals to the historical station.

[0065] The history station is used to receive field alarm signals, field operation signals and field human-machine interaction signals sent by the control station; and to store, maintain and query field operation signals, field alarm signals and field human-machine interaction signals.

[0066] With reference to [Fig.3], in this embodiment, as one of the feasible ways, the field control layer further includes a communication station.

[0067] The communication station is equipped with communication application software, and a communication interface module is provided for the nuclear unit that supplies heat to the nuclear power plant. The communication application software of the communication station communicates with the communication interface module of the nuclear unit based on the Modbus TCP protocol.

[0068] Digital and analog communication points are configured between the nuclear power plant and the nuclear unit. The communication station collects the values ​​from the digital and analog communication points in real time.

[0069] The communication interface module of the nuclear unit sends signal requests to the communication application software of the communication station according to the defined frequency.

[0070] The communication station's communication application software receives signal requests sent by the nuclear power unit's communication interface module, and sends the signals requested by the nuclear power unit's communication interface module to the nuclear power unit's communication interface module.

[0071] The communication interface module of the nuclear power unit receives the signals sent by the communication application software of the communication station, and organizes and introduces them into the DCS display of the nuclear power unit.

[0072] The signal requests sent by the communication interface module of the nuclear power unit to the communication application software of the communication station are the values ​​of the digital communication points and the analog communication points.

[0073] In this embodiment, as one of the feasible ways, the nuclear steam feed station is heated jointly by two units of nuclear power, the communication interface module of each nuclear power unit is connected to the communication station by optical fiber, photoelectric converters are provided respectively at both ends of the optical fiber, a firewall is provided between the photoelectric converter and the communication station, the communication station is connected to the firewall by twisted cables, the firewall is connected to the photoelectric converter by twisted cables, and the communication interface module of each nuclear power unit is connected to the photoelectric converter by twisted cables.

[0074] In this embodiment, as one of the feasible ways, the monitoring control layer further includes a printer and two ring networks; there are two control stations and two history stations, one control station serves as an engineer station and a history station, and the other control station serves as a communication station and the other as a history station.

[0075] The ground layer further includes a network cabinet and two relays. There are four I / O control cabinets, two I / O control cabinets correspond to one relay cabinet, and two switches are arranged in the network cabinet.

[0076] The printer is connected to one of the ring networks, and each switch is connected to two ring networks respectively; each control station and each controller is equipped with two dual-ring segmented network cards, each control station is connected to two ring networks respectively, and each controller is connected to two ring networks and two switches respectively.

[0077] In this embodiment, as one of the feasible ways, the ground layer further comprises an electrical distribution cabinet. The electrical distribution cabinet receives two AC power supplies; one AC power supply is used to power the nuclear power plant, and the other is used to power the inverter.

[0078] A 220 V AC power supply switching module is provided in the electrical distribution cabinet, and the electrical distribution cabinet redundantly switches the two AC power supplies received by the 220 V AC power supply switching module, and provides working power for the I / O control cabinets, the relay cabinet, the network cabinet, an operating table and the printer respectively.

[0079] The I / O control cabinets are equipped with DC power conversion modules, and the I / O control cabinets receive 220 V AC power supplies from the electrical distribution cabinet, and convert the 220 V AC power supplies into (24-48) V DC power supplies by the modules DC power conversion, and provide working power for input and output modules in I / O control cabinets.

[0080] In the nuclear steam supply control system of this example, the field human-machine interaction display shows field operation signals and field alarm signals. The operator performs field human-machine interaction on the field human-machine interaction display, which is convenient for the operator to monitor and control field operations. The highly redundant design means that a single failure does not affect the system's operation. The main controller and the standby controller operate simultaneously, and the main controller outputs the operating results to ensure seamless switching between the main controller and the standby controller.

[0081] The examples mentioned above only illustrate several instances of the present patent, and the description is relatively specific and detailed, but it cannot be construed as a limitation of the scope of this patent. It should be noted that, for an expert in the field, without departing from the concept of this patent, several distortions and improvements can be made, all of which fall within the scope of protection of this patent. Therefore, the scope of protection of this patent must be defined by the claims.

Claims

Demands

1. A nuclear steam feed control system, characterized in that the nuclear steam feed control system is configured to allow operators to monitor and control a field operation of a nuclear steam feed station, and comprises: a monitoring control layer, configured by the operators to perform field human-machine interaction on a field human-machine interaction display in order to generate field human-machine interaction signals and send field human-machine interaction signals to a field control layer; receive field operation signals and field alarm signals sent by the field control layer; and display the field operation signals, field alarm signals and field human-machine interaction signals on the field human-machine interaction display;The field control layer, configured to collect field operation signals from a field actuator; perform field alarm logic operations on field operation signals to generate field alarm signals; send field operation signals and field alarm signals to the monitoring control layer; receive field human-machine interaction signals sent by the monitoring control layer; perform field control logic operations on field human-machine interaction signals to generate field control signals and send the field control signals to the field actuator; and the field actuator, configured to receive field control signals sent by the field control layer, and adjust the field operation signals according to the field control signals.

2. The nuclear steam supply control system according to claim 1, wherein the field control layer comprises an I / O control cabinet, and the control layer monitoring includes an engineer's station and a control station; The engineer's station is configured to configure and compile the field human-machine interaction display to generate the field human-machine interaction display, configure and compile field control logic to generate the field control logic; configure and compile field alarm logic to generate the field alarm logic; upload the field control logic and field alarm logic to the I / O control cabinet, and upload the field human-machine interaction display to the control station;The control station is configured to run the field human-machine interaction display, to perform field human-machine interaction by operators on the field human-machine interaction display in order to generate field human-machine interaction signals and send field human-machine interaction signals to the I / O control cabinet, to receive field alarm signals and field operation signals sent by the I / O control cabinet, and to display field alarm signals, field operation signals and field human-machine interaction signals on the field human-machine interaction display; The I / O control cabinet is configured to receive field human-machine interaction signals sent by the control station; perform field control logic operations on the field human-machine interaction signals to generate field control signals and send the field control signals to the field actuator; collect field operation signals from the field actuator; perform field alarm logic operations on the field operation signals to generate field alarm signals; and send the field operation signals and field alarm signals to the control station; and The field actuator is configured to receive field control signals sent by the I / O control cabinet, and adjust the field operation signals according to the field control signals.

3. The nuclear steam supply control system according to claim 2, wherein the I / O control cabinet is provided with a Profibus DP bus, input and output modules, and two controllers; the two controllers are configured redundantly with respect to each other, one controller being a primary controller and the other controller being a standby controller; the two controllers are respectively connected via the Profibus DP bus to the input and output modules; and the input and output modules are connected to the field actuator; the engineer station is configured to synchronously download field control logic and field alarm logic to the primary controller and the standby controller; the control station is configured to synchronously send field human-machine interaction signals to the primary controller and the standby controller;receive field alarm signals and field operation signals sent by the main controller; display field alarm signals and field operation signals sent by the main controller on the field human-machine interaction display; the field actuator is configured to collect field operation signals and send field operation signals to the input and output modules; receive field control signals sent by the input and output modules, and adjust the field operation signals according to the field control signals; the input and output modules are configured to receive field operation signals sent by the field actuator, and synchronously send the field operation signals to the main controller and the standby controller;receive field control signals sent by the main controller and send the field control signals to the field actuator; the main controller is configured to receive field human-machine interaction signals sent by the control station; perform field control logic operations on the field human-machine interaction signals to generate field control signals and send the field control signals to the input and output modules; receive;

4.

5. field operation signals sent by the field actuator; perform field alarm logic operations on the field operation signals to generate field alarm signals; and send the field operation signals and field alarm signals to the control station; The standby controller is configured to receive field human-machine interaction signals sent by the control station; perform field control logic operations on the field human-machine interaction signals to generate field control signals; receive field operation signals sent by the field actuator; perform field alarm logic operations on the field operation signals to generate field alarm signals; and the main controller and the standby controller simultaneously receive field human-machine interaction signals sent by the control station, simultaneously perform field control logic operations on the field human-machine interaction signals to simultaneously generate field control signals;simultaneously receive field operation signals sent by the field actuator, simultaneously perform field alarm logic operations on the field operation signals to simultaneously generate field alarm signals. The nuclear steam supply control system according to claim 3, wherein the main controller and the watch controller exchange synchronization signals and signals for establishing a link at each operating cycle to ensure that the main controller and the watch controller are ready for data exchange; The standby controller follows the main controller via synchronization signals, and when the main controller fails or stops working, the main controller and the standby controller are switched over. The nuclear steam supply control system according to claim 4, wherein monitoring circuits and fault self-checking circuits are provided in both the main controller and the standby controller; When the main controller fails, the main controller monitoring circuit is activated, and the standby controller is switched to the main controller, and the main controller is switched to the standby controller; and when the main controller stops working, the main controller fault self-checking circuit is activated, and the standby controller is switched to the main controller, and the main controller is switched to the standby controller.

6. The nuclear steam supply control system according to claim 1, wherein the field human-machine interaction includes the setting of analog and digital signals, and the field human-machine interaction signals include analog setting signals and digital setting signals; the field control signals and the field operation signals both include analog and digital signals; the analog signals include liquid level signals, pressure signals, temperature signals and valve opening position signals, and the digital signals include pump standby activation signals and valve interlock signals;Analog control signals include liquid level control signals, pressure control signals, temperature control signals, and valve opening position control signals; and digital control signals include pump standby activation command signals and valve interlock switching command signals.

7. The nuclear steam supply control system according to claim 6, wherein the field human-machine interaction display comprises a field process flow diagram, wherein field operation signals, field human-machine interaction signals, and field alarm signals are displayed in the field process flow diagram; in the field process flow diagram, a standby activation button is provided for pumps in redundancy between them, and a lockout button is provided for valves locked; by activating or deactivating the pump standby activation button and confirming, the pump standby activation control signals are generated; by activating or deactivating the valve lock cutoff button and confirming, the valve lock switching control signals are generated; field control logic operations are performed on the pump standby activation control signals, and the pump standby activation signals are generated according to the pump standby activation control signals; and field control logic operations are performed on the valve lock cutoff setting signals, and the valve lock signals are generated according to the valve lock cutoff setting signals.

8. The nuclear steam supply control system according to claim 6, wherein the field alarm signals comprise an analog high limit alarm signal and an analog low limit alarm signal; the execution of the field alarm logic operations on the field operation signals to generate the field alarm signals comprises the following steps: generating a low limit alarm signal of the analog signal, when the analog signal is below a set low limit; and generating an high limit alarm signal of the analog signal, when the analog signal is above a set high limit.

9. The nuclear steam supply control system according to claim 3, wherein the field control layer further comprises a history station; the control station is further configured to send field alarm signals, field operation signals and field human-machine interaction signals to the history station; and the history station is configured to receive field alarm signals, field operation signals and field human-machine interaction signals sent by the control station; and store, maintain and query the field operation signals, field alarm signals and field human-machine interaction signals.

10.

11. The nuclear steam supply control system according to claim 9, wherein the field control layer further comprises a communication station; digital communication points and analog communication points are configured between the nuclear steam generating station and a nuclear power unit; the communication station collects in real time the values ​​of the digital communication points and the analog communication points; The nuclear power unit sends signal requests to the communication station at a defined frequency; the communication station receives the signal requests sent by the nuclear power unit and sends the signals requested by the nuclear power unit back to the nuclear power unit; the nuclear power unit receives the signals sent by the communication station and organizes and inputs the signals into a DCS display of the nuclear power unit; and The signal requests sent by the nuclear power unit are the values ​​of the digital communication points and the analog communication points. The nuclear steam supply control system according to claim 10, wherein the monitoring control layer further comprises a printer and two ring networks; there are two control stations and two history stations, one control station serving as an engineer station and one history station, and the other control station serving as a communications station and the other history station; The field control layer further includes a network cabinet and two relays; there are four I / O control cabinets, two I / O control cabinets corresponding to one relay cabinet, and two switches are arranged in the network cabinet; and the printer is connected to one of the ring networks, and each switch is connected to both ring networks respectively; each control station and each controller is equipped with two dual-ring segmented network cards, each control station is connected to both ring networks respectively, and each controller is connected to both ring networks and the two switches respectively.

12. The nuclear steam supply control system according to claim 11, wherein the field control layer further comprises an electrical distribution cabinet; the electrical distribution cabinet receives two AC power supplies; an AC power supply switching module is provided in the electrical distribution cabinet, and the electrical distribution cabinet switches the two AC power supplies received by the AC power supply switching module in redundancy, and provides power to the I / O control cabinets, the relay cabinet, the network cabinet, an operating table, and the printer, respectively; and DC power conversion modules are provided in the I / O control cabinets, and the 1 / O control cabinets receive AC power supplies from the electrical distribution cabinet, convert the AC power supplies to DC power supplies by the DC power conversion modules, and provide power to the input and output modules in the I / O control cabinets.

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