CN113571218A - Priority selection system of nuclear power station - Google Patents
Priority selection system of nuclear power station Download PDFInfo
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- CN113571218A CN113571218A CN202110771320.7A CN202110771320A CN113571218A CN 113571218 A CN113571218 A CN 113571218A CN 202110771320 A CN202110771320 A CN 202110771320A CN 113571218 A CN113571218 A CN 113571218A
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- G—PHYSICS
- G21—NUCLEAR PHYSICS; NUCLEAR ENGINEERING
- G21D—NUCLEAR POWER PLANT
- G21D3/00—Control of nuclear power plant
- G21D3/04—Safety arrangements
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Abstract
The invention provides a priority selection system of a nuclear power station, which is arranged between a control system and field equipment and comprises a plurality of preferable modules, wherein one preferable module correspondingly controls one field equipment. The optimization module is respectively connected with the control system and the field device and used for receiving each control instruction of the control system and outputting the target control instruction to the field device so as to realize optimization control. The optimization module comprises a CPLD chip which is used for processing each control instruction according to the preset optimization logic of the control instruction priority 1E DCS > ECP > DAS > NC DCS to obtain the target control instruction. The functions of the priority selection system can be enriched, and the change maintenance cost is reduced.
Description
Technical Field
The invention relates to the technical field of nuclear power, in particular to a priority selection system of a nuclear power station.
Background
Many important safety-level devices (such as pumps, valves, etc.) of a nuclear power plant need to be controlled by a plurality of control systems including a safety-level control system 1E DCS, an emergency operating platform ECP, a diversified driving system DAS, and a non-safety-level control system NCDCS, so that priority management needs to be performed on instructions from the control systems, and finally, field devices are operated through driving units. Traditional preferred module (also called equipment interface module) adopts the relay to build hardware logic in order to ensure the security, but uses the function of priority management system that this kind of mode was built too single, can't satisfy more and more complicated control requirement, in case need change control logic after the system was built to the completion simultaneously, only can change whole interface module, causes the improvement of change maintenance cost.
Disclosure of Invention
The invention provides a priority selection system of a nuclear power station, aiming at the defects in the prior art and solving the problems of single function and high changing and maintaining cost in the prior scheme.
The embodiment of the invention provides a priority selection system of a nuclear power station, which is arranged between a control system and field equipment, wherein the control system comprises a safety level control system 1EDCS, an emergency operating platform ECP, a diversified driving system DAS and a non-safety level control system NC DCS.
The priority selection system of the nuclear power plant comprises a plurality of preferred modules, and one preferred module correspondingly controls one field device. The optimization module is respectively connected with the control system and the field device and used for receiving each control instruction of the control system and outputting the target control instruction to the field device so as to realize optimization control. The optimization module comprises a CPLD (Complex Programmable logic device) chip, and is used for processing each control instruction according to the preset optimization logic of control instruction priority 1E DCS > ECP > DAS > NC DCS to obtain the target control instruction.
Preferably, the preferred module is used for receiving bus signals of control commands of the non-safety level control system NC DCS in a bus mode. The preferred module is also configured to receive control commands from the safety level control system 1E DCS, the emergency operating station ECP, and the diversified drive system DAS by hard wiring, and to output the target control commands to the field devices by hard wiring.
Preferably, the module is further connected to the backup pad BUP, and configured to receive a feedback signal of the field device in a hard-wired manner after the target control command is output to the field device, and the feedback signal is subjected to logic processing by the CPLD chip inside the module and drives a lamp on the backup pad BUP corresponding to the field device in a hard-wired manner to light up.
Preferably, the optimization module is further connected to the security engineer station by a bus, and is configured to receive configuration information configured by the security engineer station.
Preferably, the preferred module has a first interface, which is connected to the safety level control system 1E DCS and is configured to receive control signals of the safety level control system 1EDCS by hard wiring. The number of the first interfaces is two, and the two first interfaces are used for transmitting the received parallel control signals to a CPLD chip in the optimized module to obtain logical OR.
Preferably, the module also has a periodic test interface. The optimization module is also connected with the ESFAS for matching and completing the locking test, and feeds back the test result to the ESFAS in a hard-wired mode through the periodic test interface, so that the safety display unit S-VDU connected with the ESFAS displays the test result.
Preferably, the bus between the preferred module and the non-safety level control system NC DCS is a Profibus-DP bus with a safety layer, wherein the master station of the Profibus-DP is the non-safety level control system NC DCS and the slave stations of the Profibus-DP are the preferred module. The preferred module is also used to bus diagnostic information of itself and status information of the field devices to the non-safety level control system NC DCS for display.
Preferably, the module further comprises an isolation device and a Random Access Memory (RAM). The number of buses between the module and the non-safety level control system NC DCS is preferably two. And the isolation device is respectively connected with the two buses and the double-port RAM between the non-safety control system NC DCS and is used for isolating the interference in the two bus signals and transmitting the two bus signals after isolating the interference to the double-port RAM.
Preferably, the preferred module further includes an FPGA (Field Programmable Gate Array) chip. The FPGA chip is connected with the CPLD chip and the double-port RAM and used for receiving whole-frame data of the two bus signals subjected to isolation interference, the whole-frame data of the two bus signals are respectively analyzed from a protocol stack by adopting two independent standard Profibus-DP, first data of two pure data sections are obtained after verification is passed, the two first data are respectively transmitted to two independent safety layer analysis modules of the FPGA chip for data analysis, two control instructions subjected to data analysis are verified and compared, and when the comparison result is that the two control instructions are consistent, a control instruction is generated and transmitted to the CPLD chip through hard wiring for optimal logic processing.
Preferably, the priority selection system of the nuclear power plant further comprises a preferred communication module. The optimized communication modules are respectively connected with the optimized module and the non-safety level control system NCDCS through buses and used for receiving control instructions of the non-safety level control system NC DCS through a bus mode and forwarding the control instructions to the optimized modules, and the number of the optimized communication modules is two. A plurality of preferred modules and a plurality of preferred communication modules are disposed in respective preferred chassis, and a plurality of preferred chassis are disposed in respective preferred cabinets. Different preferred chassis within the same preferred cabinet are cascaded through preferred communication modules within the preferred chassis. The different preferred cabinets are each independently arranged.
The priority selection system of the nuclear power station adopts CPLD technology to realize the optimization logic function in each optimization module, can enrich the function of the priority selection system, and has low change and maintenance cost.
Drawings
FIG. 1: selecting the position of the system in the reactor protection system for the priority of the nuclear power plant of the embodiment 1;
FIG. 2: is a partial enlarged view in the circle of fig. 1;
FIG. 3: a preferred logic diagram of a priority selection system of the nuclear power plant in embodiment 1;
FIG. 4: a schematic flow chart of a lock-up test of the priority selection system of the nuclear power plant according to embodiment 1;
FIG. 5: a schematic processing logic diagram of an FPGA chip of the priority selection system of the nuclear power plant in this embodiment 1;
FIG. 6: the interior of the preferred cabinet and the preferred cabinet of the priority selection system of the nuclear power plant of embodiment 1 is formed.
Detailed Description
In order to make the technical solutions of the present invention better understood, the present invention is further described in detail below with reference to the accompanying drawings and examples.
Example 1:
as shown in fig. 1 and fig. 2, the priority selection system of a nuclear power plant provided in this embodiment is disposed between each control system of layer 1 and a field device of layer 0, where the control systems include a safety level control system 1E DCS, an emergency operating platform ECP, a diversified drive system DAS, and a non-safety level control system NC DCS. The priority selection system is matched with a reactor protection system, two priority selection systems are arranged in the A column and the B column (only the priority selection system in the A column is shown in figure 1), the functions of the priority selection systems are completely consistent, but field devices controlled downstream are different according to the A column and the B column.
The priority selection system of the nuclear power plant of the embodiment includes a plurality of preferred modules, and one preferred module controls one field device correspondingly. The optimization module is respectively connected with the control system and the field device and used for receiving each control instruction of the control system and outputting the target control instruction to the field device so as to realize optimization control. The preferred module includes a CPLD chip for prioritizing 1E DCS according to control commands
And processing each control instruction by using the preset optimal logic of ECP DAS NC DCS to obtain the target control instruction.
In the embodiment, the priority selection logic of a plurality of control system instructions is realized by adopting the CPLD technology in the optimized module, compared with the traditional method of constructing the hardware logic by adopting a relay, the method has richer functions, and only the program in the CPLD chip needs to be changed in the later-stage change maintenance without dismantling the whole hardware circuit, so the maintenance cost is low. It should be noted that the preferred module may be hardwired to the control system and the field devices, respectively, which may reduce the response time of the prioritization system. The preferred logic preset by the CPLD chip according to the priority of the control instruction is shown in fig. 3: double-instruction (an 'on instruction' and a 'off instruction') signals from four different control systems of 1E DCS, ECP, DAS and NC DCS are subjected to preferred logic processing in a safety-oriented mode in a CPLD chip in each preferred module, namely, the priority order is 1E DCS > ECP > DAS > NC DCS, and the priority of the 'on instruction' of the same control system is higher than that of the 'off instruction' (if special conditions exist in the field, the priority between the 'on instruction' and the 'off instruction' from the same control system can be flexibly adjusted through different wiring modes). After the processing of the preferred logic is completed, the CPLD outputs an "on command" and an "off command" to the driver circuit behind the preferred module (again, flexible adjustment by wiring is possible when the field device supports only single command control).
Optionally, the preferred module is configured to receive a bus signal of a control command of the non-safety-level control system NC DCS in a bus manner. The preferred module is also configured to receive control commands from the safety level control system 1E DCS, the emergency operating station ECP, and the diversified drive system DAS by hard wiring, and to output target control commands to the field devices by hard wiring.
In the traditional priority selection system built by adopting the relay, the control instructions from the non-safety control system NC DCS are all hard-wired, a large number of hard-wired and isolating devices are introduced (according to the requirements of RCC-E pressurized water reactor nuclear island electrical equipment design and construction rules, the hard-wired connection of the safety control system and the non-safety control system needs to be decoupled and isolated by using the isolating devices), so that the design is too bloated, more fault points are possibly generated, and the economic efficiency is not high. In this embodiment, because the requirement on the real-time performance of the command response by the control command of the non-safety level control system NC DCS is not high, the preferred module (or priority level selection system) is connected to the NC DCS in a bus form, which can greatly reduce the number of hard-wired lines used, and improve the economy of the nuclear power plant. The control commands of the other three control systems are usually safety protection commands, so that the control commands are still connected in a hard-wired mode, and the response time can be shortened.
Optionally, the module is further connected to the backup pad BUP, and configured to receive a feedback signal of the field device in a hard-wired manner after outputting the target control command to the field device, where the feedback signal drives a lamp on the backup pad BUP corresponding to the field device to light in a hard-wired manner after being logically processed by the CPLD chip inside the feedback signal.
In this embodiment, the preferred module receives the feedback signal of the field device, performs logic processing on the feedback signal by the CPLD inside the preferred module, and then sends the feedback signal to the BUP in a hard-wired manner to perform lighting operation, so that the state of the field device can be obtained in real time, and operators of the nuclear power plant can perform timely and accurate processing conveniently.
Optionally, the preferred module is further connected to the security engineer station by a bus, and is configured to receive configuration information configured by the security engineer station. For example, an engineer can configure each preferred module at a security engineer station, and download information to each preferred module after configuration is completed, so that the change operation is simple, and the change maintenance cost is low. Furthermore, more complex processing logic can be implemented using the station of security engineers and CPLD technology than is traditionally a purely hardware constituent of the preferred module. For example, if the field debugging stage needs to modify the feedback signal of the field device and the logic of the BUP lighting, the online modification can be performed through the bus communication of the security engineer station-corresponding preferred module.
Optionally, it is preferred that the module has a first interface. The first interfaces are connected with the security level control system 1E DCS and used for receiving control signals of the security level control system 1EDCS in a hard-wired mode, the number of the first interfaces is two, and the two first interfaces are used for transmitting the received parallel control signals to a CPLD chip in the optimized module to obtain logical OR.
In this embodiment, since the instruction from the security level control system 1E DCS is two parallel redundant control instructions, two first interfaces are designed for receiving the instruction of the 1E DCS in each preferred module, and then logical or is performed in the preferred modules, that is, as long as one path of the 1E DCS control instruction is valid, the field device can be controlled by the priority level selection system, thereby reducing the rejection rate of the entire system.
Optionally, the preferred module also has a periodic test interface. The optimization module is also connected with the ESFAS for matching and completing the locking test, and feeds back the test result to the ESFAS in a hard-wired mode through the periodic test interface, so that the safety display unit S-VDU connected with the ESFAS displays the test result.
The traditional priority selection system has the problems of complex operation and low efficiency in periodic tests due to the adoption of a hardware circuit built by a relay. In this embodiment, by designing a periodic test interface on each preferred module, periodic tests can be performed on each preferred module or a plurality of preferred modules controlling a specific equipment group in an engineering implementation manner, and test results are fed back to the ESFAS system through the periodic test interface of each preferred module and finally displayed to an operator on the S-VDU. Meanwhile, through the special circuit design in each optimized module, when the module is tested at regular intervals, the module driving part performs millisecond-level action, the execution correctness of the driving unit is verified, the misoperation of field equipment is avoided, and the reliability of the priority selection system is improved.
As shown in FIG. 4, a flow chart of a system lockout (T3) test is completed for the priority selection system in cooperation with the 1E DCS and the S-VDU. In order to ensure the reliability of the priority selection system and the control system, an operator performs a T3 periodic test on the whole system according to a set period, and verifies the validity of the system output channel to the maximum extent while not triggering the action of the field safety level equipment. The embodiment can conveniently issue an initial periodic test instruction and observe a test result in the S-VDU through design optimization, meanwhile, in order to ensure safety (for example, a timing test instruction is triggered by mistake in the S-VDU), a periodic test interface is designed in each optimized module, and the operation personnel can complete periodic test work on the system in cooperation with the operation personnel in the S-VDU through engineering design in local periodic test signals of single or grouped enabling modules. The specific test process comprises the following steps:
step S1, the operator uses the S-VDU to send a periodic TEST Enable signal TEST _ Enable1 to a certain preferred module or group of modules through the 1E DCS (the S-VDU communicates with the 1EDCS through a bus, and the 1E DCS sends and receives signals with the priority selection system through hard wiring);
step S2, the operator can confirm the periodical TEST Enable signal TEST _ Enable1 sent by the S-VDU and received by the preferred module through the local indicator light, and then let the preferred module or the preferred modules generate local periodical TEST signals TEST _ Single/TEST _ Union to be fed back to the S-VDU (through 1E DCS) through the local operation button (the button is connected to the periodical TEST interface of the preferred module or the preferred modules through engineering design);
step S3, at the same time, the corresponding preferred module enters a periodic test mode, and at this time, the signal from the 1E DCS system is locked, that is, the CPLD generates a preferred result as usual, but the preferred final output only generates a short pulse of 1ms in the drive circuit of the preferred module, so that the short pulse is not enough to make the field device operate from the 1E DCS to the drive circuit of the corresponding preferred module.
In step S4, the short pulse generated by the optimized module in step S3 outputs the result to the 1E DCS through a holding circuit in the optimized module in a hard-wired mode, and the result is fed back to the S-VDU through the 1EDCS through the network, so that an operator can confirm the completion action correctness of the 1E DCS and the optimized system in the T3 regular test in the S-VDU.
Step S5, after the TEST is completed, the operator disables TEST _ Enable1 and TEST _ Single/TEST _ Union signals in the S-VDU and the local area respectively, and the corresponding preferred module exits the periodic TEST mode and normally responds to the instruction from the 1E DCS.
Optionally, the bus between the preferred module and the non-safety level control system NC DCS is a Profibus-DP bus with a safety layer, wherein the master station of the Profibus-DP is the non-safety level control system NC DCS and the slave stations of the Profibus-DP are the preferred module. The preferred module is also used to bus diagnostic information of itself and status information of the field devices to the non-safety level control system NC DCS for display.
In this embodiment, the communication bus between the priority selection system and the NC DCS is a Profibus-DP bus with a security layer. Control instructions from the NC DCS are sent to each optimized module of the priority selection system through downlink messages of the bus, and then control corresponding field equipment after passing through optimized logic inside each optimized module; and simultaneously, the state information of the field equipment and the self-diagnosis information of the corresponding preferred module are directly fed back to the NC DCS through the bus uplink message. Compared with the traditional method that the diagnosis information is transmitted through a way of 'safety level system internal bus-safety level gateway-non-safety level gateway-NC DCS system display unit', the method saves a plurality of links in the transmission process, improves the transmission efficiency of the diagnosis information, and reduces the network load of a safety level network. In addition, a safety layer is packaged on the standard Profibus-DP bus protocol, so that communication faults (such as disorder, delay, repetition and the like) defined in IEC 61784-3 field bus function safety requirements of bus data can be prevented, the safety of the bus data is ensured, and the reliability is improved. When the bus signal of the control command received from the NC DCS can not pass the verification of the safety layer, the corresponding optimized module refuses to execute the error command, and the safety guidance of the system is ensured.
Optionally, the preferred module further comprises isolation means and a dual port RAM. The number of buses between the module and the non-safety level control system NC DCS is preferably two. And the isolation device is respectively connected with the two buses and the double-port RAM between the non-safety control system NC DCS and is used for isolating the interference in the two bus signals and transmitting the two bus signals after isolating the interference to the double-port RAM.
In this embodiment, because the priority selection system of this embodiment centralizes the control commands of the NC DCS to each preferred module on the bus for processing, if the bus fails, the preferred module of the entire priority selection system loses the connection with the NC DCS, and therefore, in order to improve reliability, the bus of the NC DCS and the priority selection system (specifically, the preferred module) adopts a redundant configuration. Further, since all the preferred modules are bus-type connected with the NC DCS, and the CPLD circuits inside the preferred modules are susceptible to external interference (such as static electricity, series winding, etc.), bus signals need to be processed by the CPLDs of the preferred modules before being processed by the isolation device, so as to prevent the normal operation of all the preferred modules from being affected when interference is introduced at one bus node.
Optionally, the preferred module further comprises an FPGA chip. The FPGA chip is connected with the CPLD chip and the double-port RAM and used for receiving whole-frame data of the two bus signals subjected to isolation interference, the whole-frame data of the two bus signals are respectively analyzed from a protocol stack by adopting two independent standard Profibus-DP, first data of two pure data sections are obtained after verification is passed, the two first data are respectively transmitted to two independent safety layer analysis modules of the FPGA chip for data analysis, two control instructions subjected to data analysis are verified and compared, and when the comparison result is that the two control instructions are consistent, a control instruction is generated and transmitted to the CPLD chip through hard wiring for optimal logic processing.
In this embodiment, each preferred module includes an FGPA chip and a CPLD chip, and the CPLD different from the FPGA is used as a processing chip of the preferred logic to improve the deep defense capability inside the module and reduce the occurrence probability of common cause faults of the computer system. And the FPGA chip is adopted to process bus signals of control instructions sent by the NC DCS, and the processing result of the FGPA chip is sent to the CPLD chip to participate in the optimal logic processing of the instructions of the plurality of control systems. After the bus signal passes through the isolation device, the bus signal is firstly cached in the double-port RAM of the optimization module, and the double-port RAM can prevent a large amount of illegal data from always occupying resources of the FPGA when the bus is abnormal, so that the throughput capacity of the data can be improved, and the response capacity of the optimization module to the NC DCS control instruction is indirectly improved. As shown in fig. 5, a schematic diagram of processing logic of bus signals of a dual-path redundant NC DCS control instruction in an FPGA chip after passing through an isolation device and a dual-port RAM is shown. Specifically, after the data is taken through the dual-port RAM, the FPGA of the preferred module obtains the whole frame data from the two redundant buses, then the two independent frames are analyzed from a protocol stack by two independent standard Profibus-DP inside the FPGA, and the data of the pure data section is obtained after verification; because the data of the data segment at the moment is encapsulated by the security layer, the two data segments are sent to two independent security layer analysis modules in the FPGA for data analysis, and then two instructions from the NC DCS are obtained if the verification is passed; after obtaining two instructions with correct analysis, the FPGA compares the two instructions, if the two instructions are consistent, an instruction is generated and sent to the CPLD through a hard line to participate in the preferred logic, and if the two instructions are inconsistent, the FPGA keeps the original instruction so as to prevent the occurrence of unexpected situations (such as two contradictory instructions sent by the NC DCS), and the reliability is improved.
Optionally, a preferred communication module is also included. The optimized communication modules are respectively connected with the optimized module and the non-safety level control system NC DCS through buses and used for receiving control instructions of the non-safety level control system NC DCS through a bus mode and forwarding the control instructions to the optimized modules, and the number of the optimized communication modules is two. A plurality of preferred modules and a plurality of preferred communication modules are disposed in respective preferred chassis, and a plurality of preferred chassis are disposed in respective preferred cabinets. Different preferred chassis within the same preferred cabinet are cascaded through preferred communication modules within the preferred chassis. The different preferred cabinets are each independently arranged.
In the present embodiment, the physical arrangement of the priority selection system is exemplified and not limited to the arrangement structure in the embodiment. As shown in fig. 6, the priority selection system is physically composed of preferred cabinets, and the preferred cabinets are not interconnected, and can be flexibly arranged according to the number of the control security level devices in the design stage. The preferred cabinet is composed of:
(1) the preferable chassis: the chassis is used for bearing various functional modules, and a back plate containing data and a control bus is preferably arranged in the chassis and used for transmitting data;
(2) the preferred module is as follows: the main function module is arranged in the optimized case, and signal input and optimized output are realized through the optimized terminal module;
(3) the preferred terminal module: directly connecting with DCS system or field device to provide channel protection and relay/MOSFET output;
(4) I/O switching module: signal connection of the preferred module and the preferred terminal module is realized;
(5) the preferred communication switching module: the communication switching module is connected with the NC DCS system and is arranged in the case to realize optical/electrical signal conversion;
(6) the preferred communication module: the communication state indication of the case and the NC DCS system is realized through a front panel indicator light;
(7) a management module: the system is responsible for downloading the configuration information of the security engineer station into the preferred module through a backboard bus;
(8) the management switching module: the security level engineer station is connected with the security level engineer station through a security level configuration bus;
(9) a power supply module: the power supply is arranged in the optimized case and provides working power supply for the various modules;
(10) the auxiliary equipment comprises: for carrying the preferred chassis and other accessory equipment (e.g., fans, panels, etc.).
Wherein the preferred chassis is designed according to a standard 6U chassis, and a single preferred cabinet can control up to 36 field devices if the entire preferred cabinet is fully populated with preferred modules. The entire preferred rack is connected to the NC DCS only through the preferred communication switch module (or pair of preferred communication switch modules if a redundant bus) on one of the preferred enclosures, and different preferred enclosures of the same preferred rack are cascaded through the preferred communication switch modules (preferred communication modules) within the preferred enclosure, with all preferred modules within the rack being a slave node on the Profibus-DP bus via these cascaded lines. For example, two redundant Profibus-DP buses from an NC DCS switch the buses to a backplane through two separate preferred communication switch modules of a preferred rack, which are then connected by the backplane to two communication ports of each preferred module through connectors. Thus, only one pair of Profibus-DP master stations in the NC DCS is needed to issue the control commands of 36 preferred modules (corresponding to 36 field devices) by the NC DCS, and compared with the traditional design of receiving the control commands of the NC DCS in a hard-wired mode, the design enables 36 hard-wired cables to be saved in a single preferred cabinet (if the preferred modules are controlled by double commands, each preferred module needs 2 cables, and the preferred cabinet needs 72 cables in total), so that the use of wall penetration pieces is reduced, and the economic benefit is improved.
In the priority selection system of the nuclear power plant of this embodiment, first, the control commands from the safety level control system, the emergency console, and the diversified driving system are received in a hard-wired manner, and the rejection rate of the important controlled equipment is reduced by using a parallel input or output manner for the signals of the important safety level control system. And then, a Profibus-DP bus mode with a safety layer is used for receiving the automatic control instruction from the non-safety control system, so that the setting of hard wiring is reduced, and the design economy is improved on the premise of ensuring the safety. Then, each main control module of the whole priority selection system uses FPGA and CPLD technologies, so that functions of each module are richer, and more state information of field equipment and a preferred module can be fed back. Finally, the special design of the drive part of the preferred module in the system enables the system to cooperate with a safety display unit (S-VDU) and a safety special system (ESFAS) to complete the T3 test to the drive unit, so that the in-service reliability of the whole priority selection system is ensured.
It will be understood that the above embodiments are merely exemplary embodiments taken to illustrate the principles of the present invention, which is not limited thereto. It will be apparent to those skilled in the art that various modifications and improvements can be made without departing from the spirit and substance of the invention, and these modifications and improvements are also considered to be within the scope of the invention.
Claims (10)
1. A priority selection system of a nuclear power station is characterized by being arranged between a control system and field equipment, wherein the control system comprises a safety level control system 1E DCS, an emergency operation platform ECP, a diversified driving system DAS and a non-safety level control system NC DCS,
the priority selection system of the nuclear power plant comprises a plurality of preferred modules, one preferred module correspondingly controls one field device,
the optimization module is respectively connected with the control system and the field device and used for receiving each control instruction of the control system and outputting a target control instruction to the field device to realize optimization control,
the optimization module comprises a CPLD chip which is used for processing each control instruction according to the preset optimization logic of the control instruction priority 1E DCS > ECP > DAS > NC DCS to obtain the target control instruction.
2. The priority selection system of a nuclear power plant as recited in claim 1,
a preferred module, which is used for receiving the bus signal of the control instruction of the non-safety level control system NC DCS through a bus mode,
the preferred module is also configured to receive control commands from the safety level control system 1E DCS, the emergency operating station ECP, and the diversified drive system DAS by hard wiring, and to output the target control commands to the field devices by hard wiring.
3. The priority selection system of nuclear power plant according to claim 2, wherein the optimization module is further connected to the backup pad BUP, and configured to receive a feedback signal of the field device in a hard-wired manner after outputting the target control command to the field device, and the feedback signal drives a lamp on the backup pad BUP corresponding to the field device to light in a hard-wired manner after being logically processed by the CPLD chip inside the feedback signal.
4. The priority selection system of a nuclear power plant according to claim 3,
the optimization module is also connected with the security engineer station in a bus mode and used for receiving configuration information configured by the security engineer station.
5. The priority selection system of nuclear power plant as claimed in claim 4, wherein the preference module has a first interface,
a first interface connected with the safety level control system 1E DCS and used for receiving the control signal of the safety level control system 1E DCS in a hard-wired mode,
the number of the first interfaces is two, and the two first interfaces are used for transmitting the received parallel control signals to a CPLD chip in the optimized module to obtain logical OR.
6. The priority selection system of nuclear power plant as claimed in claim 5, wherein the preference module further has a periodic test interface,
the optimization module is also connected with the ESFAS for matching and completing the locking test, and feeds back the test result to the ESFAS in a hard-wired mode through the periodic test interface, so that the safety display unit S-VDU connected with the ESFAS displays the test result.
7. The priority selection system of a nuclear power plant according to claim 6,
the bus between the preferred module and the non-safety level control system NC DCS is a Profibus-DP bus with a safety layer, wherein, the main station of the Profibus-DP is the non-safety level control system NC DCS, the slave station of the Profibus-DP is the preferred module,
the preferred module is also used to bus diagnostic information of itself and status information of the field devices to the non-safety level control system NC DCS for display.
8. The priority selection system of nuclear power plant as claimed in claim 7, wherein the preference module further comprises an isolation device and a dual port RAM,
the number of buses between the module and the non-safety level control system NC DCS is preferably two,
and the isolation device is respectively connected with the two buses and the double-port RAM between the non-safety control system NC DCS and is used for isolating the interference in the two bus signals and transmitting the two bus signals after isolating the interference to the double-port RAM.
9. The priority selection system of nuclear power plant as claimed in claim 8, wherein the preference module further includes an FPGA chip,
the FPGA chip is connected with the CPLD chip and the double-port RAM and is used for receiving the whole frame data of the two bus signals after the interference is isolated, analyzing the whole frame data of the two bus signals from a protocol stack by adopting two independent standard Profibus-DP respectively, obtaining first data of two pure data sections after the verification is passed, transmitting the two first data to two independent safety layer analysis modules of the FPGA chip respectively for data analysis, verifying and comparing two control instructions after the data analysis,
and when the comparison result shows that the two control instructions are consistent, generating a control instruction and transmitting the control instruction to the CPLD chip through hard wiring to perform optimal logic processing.
10. The priority selection system of nuclear power plant as recited in claim 9, further comprising a preference communication module,
the optimized communication module is respectively connected with the optimized module and the non-safety level control system NC DCS through buses and is used for receiving the control instruction of the non-safety level control system NC DCS through a bus mode and transmitting the control instruction to the optimized module, the number of the optimized communication modules is two,
a plurality of preferred modules and a plurality of preferred communication modules are disposed in respective preferred cabinets, a plurality of preferred cabinets are disposed in respective preferred cabinets,
different preferred chassis within the same preferred cabinet are cascaded by preferred communication modules within the preferred chassis,
the different preferred cabinets are each independently arranged.
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| CN202110771320.7A CN113571218A (en) | 2021-07-08 | 2021-07-08 | Priority selection system of nuclear power station |
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