Valve cooling control system and control method

Abstract

The invention discloses a valve cooling control system and method. The system comprises a control module, an input module and a protection module, the input module is used for collecting and outputting signals; the protection module is used for trip protection output; the first control unit is in communication connection with the operation station through the first switch; the first control unit is in communication connection with the protection module through a second switch; the first control unit is in communication connection with the second control unit; and the first control unit, the first input unit, the second input unit, the third input unit and the second control unit are sequentially in communication connection through a power link ring network. The embodiment of the invention is beneficial to improving the working reliability of the system and improving the working efficiency. The method can be widely applied to the technical field of valve control.

Description

Technical Field

[0001] The present invention relates to the technical field of valve control, and in particular to a valve cooling control system and a control method. Background Art

[0002] In recent years, valve cooling control systems have been implemented through specific mechanical devices to control the flow, flow direction, pressure, temperature, etc. of fluid media. This system plays a basic and key role in the pipeline system to ensure the effective management and control of the fluid. In related technologies, if a link in the control process of the valve cooling control system fails, the entire system may stop working, and the reliability of the system needs to be improved. At the same time, the control efficiency is low. Summary of the invention

[0003] The purpose of the present invention is to solve one of the technical problems existing in the prior art to at least a certain extent.

[0004] Therefore, an object of the present invention is to provide a reliable valve cooling control system and control method.

[0005] In order to achieve the above technical objectives, the technical solutions adopted by the embodiments of the present invention include the following aspects:

[0006] On the one hand, an embodiment of the present invention provides a valve cooling control system, including: a control module, an input module and a protection module; the control module includes a first control unit and a second control unit, the input module includes a first input unit, a second input unit and a third input unit; the protection module includes a first protection unit, a second protection unit and a third protection unit; wherein the input module is used for signal acquisition and output; the protection module is used for trip protection output; the first control unit is connected to the operation station through a first switch, the second control unit is connected to the operation station through a first switch, and the operation station is used to input control signals or output target results; the first control unit is connected to the protection module through a second switch, and the second control unit is connected to the protection module through a second switch; the first control unit is connected to the second control unit; the first control unit, the first input unit, the second input unit, the third input unit and the second control unit are connected in turn through a power link ring network communication. The embodiment of the present application alleviates the problem that any unit failure affects the working reliability of the system through the redundant design of the control module, the input module and the protection module, which is conducive to improving the working reliability of the system; at the same time, the embodiment of the present application realizes the efficient transmission of data and information through the ring network communication link, which is conducive to improving work efficiency.

[0007] In addition, the valve cooling control system according to the above embodiment of the present invention may also have the following additional technical features:

[0008] Furthermore, in the valve cooling control system of the embodiment of the present invention, the first input end of the first input unit is used to receive a digital input signal, and the second input end of the second input unit is used to receive a digital input signal; the control module is used to determine an out-of-tolerance alarm according to the deviation between the digital input signal received by the first input end and the digital input signal received by the second input end; the control module is used to operate on the input digital quantity to obtain a first operation result; the output end of the first input unit is used to output the first operation result, and the output end of the second input unit is used to output the first operation result.

[0009] Furthermore, in one embodiment of the present invention, the control module is used to receive a first protection action result of the first protection unit, a second protection action result of the second protection unit, and a third protection action result of the third protection unit; and output a tripping determination logic based on two of the protection action results; and the control module is used to output the protection action result through the second protection unit and the third protection unit if the first protection unit fails.

[0010] Furthermore, in one embodiment of the present invention, the control module includes a redundant data synchronization unit, and the redundant data synchronization unit is used for data synchronization between the first control unit and the second control unit, and the data sent by the first control unit is transmitted to the second control unit via the redundant data synchronization unit.

[0011] Furthermore, in one embodiment of the present invention, the input module and the protection module are used to control a dual-circulation pump, an electric heater and a cooling fan.

[0012] On the other hand, an embodiment of the present invention provides a valve cooling control method, which is applied to the above-mentioned valve cooling control system. The method includes:

[0013] receiving an input signal through the first input unit, the second input unit, and the third input unit;

[0014] The first control unit and the second control unit calculate the input signal to determine the protection action result;

[0015] According to the protection action result, a logic output is determined.

[0016] Furthermore, in the valve cooling control method of the embodiment of the present invention, redundant data synchronization is achieved by the following steps:

[0017] If the first control unit and the second control unit are in operation and no write output operation is performed, it is determined to perform a user data synchronization operation; the data sent by the first control unit is transmitted to the second control unit via a redundant data synchronization unit.

[0018] Furthermore, in the valve cooling control method of the embodiment of the present invention, the dual circulation pump is controlled by the following steps:

[0019] After determining that the first main circulation pump executes the power frequency operation for the first time period, the second main circulation pump is soft-started;

[0020] After the second time period, the soft start contactor and the power frequency contactor of the second main circulation pump are energized, and the second main circulation pump performs power frequency operation;

[0021] After the third time period, the soft starter of the second main circulation pump stops running.

[0022] Furthermore, in the valve cooling control method of the embodiment of the present invention, the electric heater is controlled by the following steps:

[0023] If the control temperature is less than or equal to the start temperature of the electric heater, and less than or equal to the stop temperature, it is determined that the electric heater is started with a delay without a fault;

[0024] If the control temperature is greater than the stop temperature of the electric heater, the electric heater is stopped.

[0025] Further, in the valve cooling control method of the embodiment of the present invention, the cooling fan is controlled by the following steps: if the inlet valve temperature is greater than or equal to the first temperature, the first group of variable frequency fans are started; if the inlet valve temperature is the second temperature, the frequency of the first group of variable frequency fans is determined to decrease; if the inlet valve temperature is in the first temperature range, the frequency of the first group of variable frequency fans is determined to remain unchanged; the second temperature is less than the first temperature, and the second temperature is less than any temperature in the first temperature range;

[0026] If the inlet valve temperature is greater than or equal to a third temperature, the first group of variable frequency fans and the second group of variable frequency fans are started; the third temperature is greater than the first temperature.

[0027] On the other hand, an embodiment of the present invention provides a valve cooling control device, comprising:

[0028] at least one processor;

[0029] at least one memory for storing at least one program;

[0030] When the at least one program is executed by the at least one processor, the at least one processor implements the above-mentioned valve cooling control method.

[0031] On the other hand, an embodiment of the present invention provides a storage medium, in which a program executable by a processor is stored. When the program executable by the processor is executed by the processor, it is used to implement the above-mentioned valve cooling control method.

[0032] The system provided by the embodiment of the present invention includes: a control module, an input module and a protection module; the control module includes a first control unit and a second control unit, the input module includes a first input unit, a second input unit and a third input unit; the protection module includes a first protection unit, a second protection unit and a third protection unit; wherein the input module is used for signal acquisition and output; the protection module is used for trip protection output; the first control unit is connected to the operation station through a first switch, the second control unit is connected to the operation station through a first switch, and the operation station is used to input control signals or output target results; the first control unit is connected to the protection module through a second switch, and the second control unit is connected to the protection module through a second switch; the first control unit is connected to the second control unit; the first control unit, the first input unit, the second input unit, the third input unit and the second control unit are connected in turn through a power link ring network communication. The embodiment of the present application alleviates the problem that any unit failure affects the working reliability of the system through the redundant design of the control module, the input module and the protection module, which is conducive to improving the working reliability of the system; at the same time, the embodiment of the present application realizes the efficient transmission of data and information through the ring network communication link, which is conducive to improving work efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the embodiments of the present invention or the drawings of related technical solutions in the prior art are introduced below. It should be understood that the drawings introduced below are only for the convenience of clearly describing some embodiments of the technical solutions of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 A schematic diagram of the structure of the valve cooling control system provided in this application;

[0035] Figure 2 A schematic diagram of the signal connection relationship of the digital input module provided in this application;

[0036] Figure 3 A schematic diagram of the signal connection relationship of the digital output module provided in this application;

[0037] Figure 4 A schematic diagram of the signal connection relationship of the analog input module provided in this application;

[0038] Figure 5 A flowchart of an embodiment of redundant data synchronization provided by the present application;

[0039] Figure 6 A flowchart of an embodiment of power link access provided by the present application;

[0040] Figure 7 A flow chart of an embodiment of Modbus TCP communication provided by the present application;

[0041] Figure 8 A schematic flow chart of an embodiment of a dual circulation pump control process provided by the present application;

[0042] Fig. 9 A schematic flow chart of another embodiment of the dual circulation pump control process provided by the present application;

[0043] Fig.10 A schematic diagram of a flow chart of an embodiment of a dual circulation pump fault switching provided by the present application;

[0044] Fig.11 A schematic flow chart of an embodiment of an electric heater control process provided by the present application;

[0045] Fig.12 A schematic flow chart of another embodiment of the electric heater control process provided in the present application. DETAILED DESCRIPTION

[0046] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and are not to be construed as limitations of the present invention. For the step numbers in the following embodiments, they are only provided for the convenience of explanation, and the order between the steps is not limited in any way, and the execution order of each step in the embodiment can be adaptively adjusted according to the understanding of those skilled in the art.

[0047] In recent years, valve cooling control systems have been implemented through specific mechanical devices to control the flow, flow direction, pressure, temperature, etc. of fluid media. This system plays a basic and key role in the pipeline system to ensure the effective management and control of the fluid. In related technologies, if a link in the control process of the valve cooling control system fails, the entire system may stop working, and the reliability of the system needs to be improved. At the same time, the control efficiency is low.

[0048] At present, the domestic valve cooling control system mainly adopts PLC controller. The mainstream equipment manufacturers of PLC controller are Siemens, Omron, Rockwell, etc., which are realized through imported products, making the cost of system realization high.

[0049] The valve cooling control system and implementation method proposed in the embodiments of the present invention are described in detail below with reference to the accompanying drawings. First, a valve cooling control system proposed in the embodiments of the present invention is described with reference to the accompanying drawings.

[0050] Figure 1 Schematic diagram of the valve cooling control system structure of an embodiment of the present invention, the system specifically includes:

[0051] Control module, input module and protection module;

[0052] The control module includes a first control unit and a second control unit, the input module includes a first input unit, a second input unit and a third input unit; the protection module includes a first protection unit, a second protection unit and a third protection unit;

[0053] Among them, the input module is used for signal collection and output; the protection module is used for tripping protection output;

[0054] The first control unit is connected to the operation station through the first switch, and the second control unit is connected to the operation station through the first switch. The operation station is used to input control signals or output target results.

[0055] The first control unit is connected to the protection module through the second switch, and the second control unit is connected to the protection module through the second switch; the first control unit is connected to the second control unit;

[0056] The first control unit, the first input unit, the second input unit, the third input unit and the second control unit are sequentially connected via a power link ring network communication.

[0057] The control module in the embodiment of the present application can be controlled by Beijing Hollysys LK226C series redundant PLC.

[0058] The control system provided by the embodiment of the present application includes: a control module, an input module and a protection module; the control module includes a first control unit and a second control unit, the input module includes a first input unit, a second input unit and a third input unit; the protection module includes a first protection unit, a second protection unit and a third protection unit; wherein the input module is used for signal acquisition and output; the protection module is used for trip protection output; the first control unit is connected to the operation station through the first switch, the second control unit is connected to the operation station through the first switch, and the operation station is used to input control signals or output target results; the first control unit is connected to the protection module through the second switch, and the second control unit is connected to the protection module through the second switch; the first control unit is connected to the second control unit; the first control unit, the first input unit, the second input unit, the third input unit and the second control unit are connected in turn through the power link ring network communication. The embodiment of the present application alleviates the problem that any unit failure affects the working reliability of the system through the redundant design of the control module, the input module and the protection module, which is conducive to improving the working reliability of the system; at the same time, the embodiment of the present application realizes the efficient transmission of data and information through the ring network communication link, which is conducive to improving work efficiency.

[0059] Optionally, in the valve cooling control system in the embodiment of the present invention, the first input end of the first input unit is used to receive a digital input signal, and the second input end of the second input unit is used to receive a digital input signal; the control module is used to determine an out-of-tolerance alarm based on the deviation between the digital input signal received at the first input end and the digital input signal received at the second input end; the control module is used to operate on the input digital quantity to obtain a first operation result; the output end of the first input unit is used to output the first operation result, and the output end of the second input unit is used to output the first operation result.

[0060] In some possible implementations, the output end of the second input unit maintains the same output result as the output end of the first input unit.

[0061] Optionally, in the valve cooling control system in the embodiment of the present invention, the control module is used to receive the first protection action result of the first protection unit, the second protection action result of the second protection unit and the third protection action result of the third protection unit; and output the tripping judgment logic according to two of the protection action results; the control module is used to output the protection action result through the second protection unit and the third protection unit if the first protection unit fails.

[0062] In some possible implementations, the control module is used to output the protection action result through the first protection unit and the third protection unit if the second protection unit fails. Similarly, if the third protection unit fails, it will not affect the normal operation of the system.

[0063] Optionally, in the valve cooling control system in the embodiment of the present invention, the control module includes a redundant data synchronization unit, which is used for data synchronization between the first control unit and the second control unit. The data sent by the first control unit is transmitted to the second control unit through the redundant data synchronization unit.

[0064] Optionally, in the valve cooling control system in the embodiment of the present invention, the input module and the protection module are used to control the dual circulation pump, the electric heater and the cooling fan.

[0065] Next, a valve cooling control method according to an embodiment of the present invention will be described with reference to the accompanying drawings.

[0066] A valve cooling control method is provided in an embodiment of the present invention. The valve cooling control method in the embodiment of the present invention can be applied to a terminal, a server, or software running in a terminal or a server. The terminal can be a tablet computer, a laptop computer, a desktop computer, etc., but is not limited thereto. The server can be an independent physical server, or a server cluster or distributed system composed of multiple physical servers, or a cloud server that provides basic cloud computing services such as cloud services, cloud databases, cloud computing, cloud functions, cloud storage, network services, cloud communications, middleware services, domain name services, security services, CDN, and big data and artificial intelligence platforms. The valve cooling control method in the embodiment of the present invention is applied to the above valve cooling control system, and mainly includes the following steps:

[0067] receiving an input signal through the first input unit, the second input unit, and the third input unit;

[0068] The first control unit and the second control unit calculate the input signal to determine the protection action result;

[0069] Determine the logic output according to the protection action result.

[0070] Optionally, in the valve cooling control method in the embodiment of the present invention, redundant data synchronization is achieved by the following steps:

[0071] If the first control unit and the second control unit are in operation and no write output operation is performed, it is determined to perform a user data synchronization operation; the data sent by the first control unit is transmitted to the second control unit via the redundant data synchronization unit.

[0072] Optionally, in the valve cooling control method in the embodiment of the present invention, the dual circulation pump is controlled by the following steps:

[0073] Determine that the first main circulation pump performs the power frequency operation for the first time duration, and the second main circulation pump soft-starts;

[0074] After the second time period, the soft start contactor and the power frequency contactor of the second main circulation pump are energized, and the second main circulation pump performs power frequency operation;

[0075] After the third time period, the soft starter of the second main circulation pump stops running.

[0076] The control method provided in the embodiment of the present application further includes:

[0077] In the maintenance mode, the main circulation pump is manually started; in the automatic mode, the manual start of the main circulation pump is invalid;

[0078] The main circulation pump receives a local automatic start command or a remote automatic start command, and the first main circulation pump performs a soft start;

[0079] After a certain period of time, the soft start contactor and the power frequency contactor are energized, and the first main circulation pump performs power frequency operation;

[0080] After a certain period of time, the soft starter stops running;

[0081] Switching process of dual circulation pump:

[0082] Determine that the first main circulation pump performs the power frequency operation for the first time duration, and the second main circulation pump soft-starts;

[0083] After the second time period, the soft start contactor and the power frequency contactor of the second main circulation pump are energized, and the second main circulation pump performs power frequency operation;

[0084] After the third time period, the soft starter of the second main circulation pump stops running.

[0085] The conditions for the dual circulation pump to perform the switching process are:

[0086] If the outlet water pressure of the main circulation pump is less than or equal to the preset outlet water pressure, it is determined to switch from the current main circulation pump to the standby main circulation pump;

[0087] If the inlet valve pressure of the main circulation pump is less than or equal to the preset inlet valve pressure, it is determined to switch from the current main circulation pump to the standby main circulation pump.

[0088] Optionally, in the valve cooling control method in the embodiment of the present invention, the electric heater is controlled by the following steps:

[0089] If the control temperature is less than or equal to the start temperature of the electric heater, and less than or equal to the stop temperature, it is determined that the electric heater has no fault delay start;

[0090] If the control temperature is greater than the stop temperature of the electric heater, the electric heater is stopped.

[0091] In some possible implementations, the electric heater is further controlled by the following steps:

[0092] If the inlet valve temperature is less than or equal to the first temperature and less than or equal to the second temperature, it is determined that the electric heater is delayed to start without fault; the first temperature and the second temperature are related to the dew point;

[0093] If the inlet valve temperature is greater than the stop temperature of the electric heater, stop the electric heater.

[0094] Optionally, in the valve cooling control method in the embodiment of the present invention, the cooling fan is controlled by the following steps:

[0095] If the inlet valve temperature is greater than or equal to the first temperature, the first set of variable frequency fans is started; if the inlet valve temperature is the second temperature, the frequency of the first set of variable frequency fans is determined to decrease; if the inlet valve temperature is in the first temperature range, the frequency of the first set of variable frequency fans is determined to remain unchanged; the second temperature is less than the first temperature, and the second temperature is less than any temperature in the first temperature range;

[0096] If the inlet valve temperature is greater than or equal to the third temperature, the first set of variable frequency fans and the second set of variable frequency fans are started; the third temperature is greater than the first temperature;

[0097] If the inlet valve temperature is greater than or equal to the fourth temperature, the first group of variable frequency fans, the second group of variable frequency fans and the third group of variable frequency fans are started; the fourth temperature is greater than the third temperature.

[0098] It can be seen that the contents of the above system embodiments are all applicable to the present method embodiments, the functions specifically implemented by the present method embodiments are the same as those of the above system embodiments, and the beneficial effects achieved are also the same as those achieved by the above system embodiments.

[0099] The control system and control method provided by the present application are described in detail below with a specific embodiment:

[0100] Reference Figure 1 As shown, the present application is an autonomous and controllable valve cooling control system, which is used for dual redundancy of control system, dual redundancy of communication link, dual redundancy of signal acquisition and output IO, and triple redundancy of trip protection output. The failure of any module in the system will not affect the performance of the valve cooling system. The control part of the valve cooling system uses Beijing Hollysys LK226C series redundant PLC, which has the ability to monitor, control and protect the valve cooling system, as well as the functions of early diagnosis, recording and analysis of abnormalities. The redundant controller has the function of non-disturbance switching between the main and standby, and the switching process will not affect the signal acquisition, logical operation and drive output of the valve cooling system.

[0101] The redundant control system connects two sets of standard LC fiber interfaces through a dedicated optical cable, with a communication rate of more than 1Gbps, for redundant data communication. The two links work redundantly. When one link fails and the other link is normal, it switches to the normal redundant link. The switching time does not exceed 10ms, thereby improving the reliability of continuous operation of the system.

[0102] Reference Figure 2 As shown, all digital input signals of the control system are connected to the A / B control system input modules respectively. The two systems take the digital input module signals sampled by the A and B control systems from their respective digital input modules for calculation. Among them, the digital input module can meet the following requirements:

[0103] 11. The control system allows a certain digital input module or channel failure without affecting the system operation;

[0104] 12. When the signals of the two input modules deviate, the system can detect the deviation of the module input signal and alarm;

[0105] 13. Two sets of system input module signals can realize dual redundancy function;

[0106] 14. All DI modules can realize hot-swap replacement function;

[0107] 15. Both control systems can identify module failure or channel out-of-tolerance and upload fault information.

[0108] Reference Figure 3 As shown, the control system is equipped with two completely independent digital output modules. The currently activated system outputs through CPU calculation, and the hot standby system receives the output of the main system through the communication module between the A\B system. The standby system follows the main system to execute control output. The digital output module in the embodiment of the present application can meet the following requirements:

[0109] 21. The control system allows a digital output module or channel failure without affecting system operation;

[0110] 22. The main system executes the operation and outputs the control signal, and the backup system follows the output through the communication module;

[0111] 23. All DO modules can realize hot-swap replacement function;

[0112] 24. Both control systems can identify module failures or channel out-of-tolerance and upload fault information.

[0113] Reference Figure 4 As shown, the valve cooling system protection measurement unit is implemented by three sets of protection units, and the valve cooling system redundant instruments are connected to three systems respectively. The triple instruments are connected to three sets of protection units respectively, and the dual instruments are connected to the A and B systems respectively, and the single instrument is connected to the C set of protection units. The protection unit in the embodiment of the present application can meet the following requirements:

[0114] 31. A single set of protection units can be taken out of operation for maintenance;

[0115] 32. Three sets of protection settings with independent CPU for logical operation;

[0116] 33. The three sets of protection each output the protection action results to the main control unit, and the main control unit realizes the three-out-of-two protection output;

[0117] 34. If one of the protection systems fails, the other two systems can still realize the protection action logic output.

[0118] for Figure 1 The system topology shown, detailed selection and operation are as follows:

[0119] 1. The selection of the main control unit (control system A / B) involves the following aspects:

[0120] 1.1 Main control backplane Select LK132C 6-slot backplane from left to right, which are power slot, controller slot, expansion slot 0 to expansion slot 3. The default device address of the controller slot is 1, and the device address of the expansion slot increases by 1, which are 2 to 5 respectively.

[0121] 1.2 Slot 0 is a redundant DC power supply module LK921C, which converts two 24V DC inputs into one 24V DC output. The two DC power supplies are protected against short circuits and overvoltages through a protection circuit composed of a slow-break fuse and a varistor. After eliminating interference signals through a filter circuit, a 24VDC is output. When one of the input circuits fails, it switches to another circuit, and the output voltage is not affected, thus achieving a safe and reliable redundant power supply mode. The basic features are: input voltage: 19.2~30VDC; input short circuit protection; support for anti-reverse insertion.

[0122] 1.3 Slot 1 is LKC226C, the main control unit of the redundant control system, which realizes the fully independent and controllable design of hardware and software. The controller uses 100 / 1000Mbps dual Ethernet interface to connect to FA-AT programming software. It supports SD card firmware upgrade and can communicate with other devices as the master / slave station of Modbus TCP. It supports three working modes: PRG, REM, and RUN. Basic features: support NTP time synchronization; support IP automatic scanning; support power-off data saving.

[0123] 1.4 Slot 2 is the LK240C redundant data synchronization module, which completes the data synchronization between the master and slave controllers and is connected via optical fiber. LK240C redundancy data such as the master controller user project, IEC operating status, controller reset / stop / run / clear operation, force and write operation to the slave controller in real time. When the system is powered on, the master and slave status is determined based on the A and B system project status and historical operating status. The basic features are: determining the master-slave mechanism; supporting gigabit optical fiber communication; supporting 2-way optical fiber interface.

[0124] 1.5 Slot 3 is the LK241C PowerLink master communication module, which exchanges data with the controller via the high-speed backplane bus. The PowerLink master periodically polls the slave, reads the slave input data, and writes the output data sent by the controller. The PowerLink network supports ring network redundancy mode. The basic features are: 2-way PowerLink Ethernet interface; PowerLink master communication protocol; support ring network redundancy mode.

[0125] 1.6 Slot 4 is the LK246C Ethernet communication processor module, which provides two 10 / 100 / 1000Mbps Ethernet ports for connecting three protection systems and one of the two Modbus TCP communications. The basic features are: 10 / 100 / 1000Mbps Ethernet port; support Modbus TCP master-slave protocol; support 16 master / slave protocols. The master and slave each support a maximum of 64 connections, and the master protocol has a maximum of 32 instructions per connection.

[0126] 2. Redundant IO (used to control the signal input / output of electrical equipment) involves the following aspects:

[0127] 2.1LK235C is a PowerLink interface module, used for PowerLink slave station, and realizes data forwarding and communication conversion with the above LK241C master station. It supports PowerLink slave protocol. It realizes data interaction between controller and I / O module through PowerLink Ethernet.

[0128] 2.2LK616C is a leakage type digital input module, used for discrete signal acquisition of valve cooling system, and is the input of system logic operation. Basic features: 32-contact leakage input; field power supply voltage: 19.2VDC~28.8VDC; module field side and system side isolation; field power supply fault diagnosis; support channel overvoltage protection; support Profibus-DP slave station protocol; support hot swap.

[0129] 2.3LK716C is a source type digital output module, used for discrete signal output of valve cooling system, used to drive valve cooling system electrical equipment, and realize automatic control. Basic features: 32-channel transistor output; field power supply voltage: 19.2VDC ~ 28.8VDC; reverse voltage protection; field power supply fault diagnosis; short circuit protection; isolation between channels and systems; support fail-safe mode output; support hot plug.

[0130] 2.4LK411C is an 8-channel current analog input module that can receive 4-20mA signals on site. The module provides 8-channel channel status indication to monitor module operation and fault status. It can diagnose module faults and channel faults. When the module fails, it reports the fault information to the controller and triggers the status indicator. When the module works normally, it reports the channel acquisition value in real time. When the module fails, the channel signal keeps the data of the previous cycle. Basic features: 8-channel current input; range: 0-20mA / 4-20mA; support four-wire and two-wire instruments with external power supply; disconnection diagnosis; under-range diagnosis; over-range diagnosis; on-site power supply fault diagnosis; isolation between channels and systems; support hot plugging.

[0131] 3. The protection system (three sets of protection systems, used to perform three-out-of-two operations and transmit them to the main control unit to determine the output trip signal) involves the following aspects:

[0132] 3.1 The protection system uses LK221C stand-alone controller and LK441C analog input module to form a protection system. A total of three sets are set up, which collect three redundant instruments of the valve cooling system for calculation and judgment. The three instruments use AND logic when judging the trip signal. When the same type of instrument corresponding to the three protection systems is judged as a trip signal, the system outputs a valid trip signal.

[0133] 3.2 Two Modbus TCP communications are set up between the three protection systems and the control system A / B, and any abnormality in any communication will not cause data transmission between the control system and the target protection system. When both communications between the main control system and the protection system are abnormal, the control system automatically switches to the backup control system to maintain normal data interaction.

[0134] Basic features: The three protection systems are independent of each other, and the shutdown of any system will not affect the tripping judgment logic output; the control system and protection system communication are dual redundant, and the failure of any one line will not cause abnormal data interaction.

[0135] The control method involved in the embodiment of the present application includes:

[0136] 41. Redundant data synchronization:

[0137] like Figure 1 As shown in the valve cooling system topology diagram, when the control system redundancy switches, in order to reduce the disturbance to the valve cooling equipment after the switch, the user data should be synchronized when the main and standby controllers are running, so as to reduce the jump of the output signal caused by the user data.

[0138] The synchronized data solution adopted by the autonomous controllable redundant controller is full data area redundancy. The advantage is that users do not need to specifically select the data that needs to be redundant, and all configured variables are redundant. For RTS (Request to Send), the technical difficulty of software implementation is relatively low.

[0139] User data is transmitted from the host to the standby. The controller module of the host rack is responsible for organizing and sending data. The data is transmitted to the LK240 redundant synchronization module through the high-speed backplane bus in the rack. The data is forwarded to the optical fiber redundant link through hardware in the LK240 module. After receiving the data, the LK240 module of the standby rack caches the data. The controller module of the standby rack will frequently query whether the LK240 module has cached data, and read the data if there is data.

[0140] Reference Figure 5 As shown in the figure, the controller synchronizes user data after each user program operation and before writing the output. This prevents switching during the sending of redundant data, which causes the output signal to regress. Therefore, the synchronization data occupies the user task cycle time. If there is a lot of data to be synchronized, the user task cycle needs to match the synchronization data time. When the programming platform executes compilation, the actual length used in each data area is identified, and RTS synchronizes the data according to the actual length used in the data area to minimize the synchronization data time.

[0141] There are two redundant data tasks in the controller to realize the function of synchronizing user data. In each user task cycle, after the host user program operation is completed, the redundant data is sent to the standby machine. During the data transmission process, the redundant data task of the standby machine processes it, and after the redundant data is received, the user data area is updated. To ensure data consistency, when the redundant data task updates the data area, it is mutually exclusive with the user program execution.

[0142] 42. POWERLINK IO module access

[0143] The autonomous controllable redundant controller expands the IO module through the POWERLINK connection protocol. The controller configures LK241C and IO-A, IO-B, and IO-C to form a ring network, such as Figure 6 The autonomous controllable redundant control system collects the digital quantity of the valve cooling system and the analog quantity signal of its instrument through the extended IO, and then transmits the value IO output after software logic processing.

[0144] 43. Control and protection separation Modbus TCP communication

[0145] Controller A and controller B are connected to the protection system composed of three LK221C through switch A, and the LK246C configured in the controller is connected to another network port of the three protection systems through switch B. Figure 7As shown, the above two network port communications are separately set to Modbus TCP. They exchange the same data storage area with the redundant controller at the upper end to form a redundant communication link. When one of the Modbus TCP communication links is abnormal, it will automatically switch to the other Modbus TCP communication link.

[0146] The main device control logic involved in the embodiments of the present application is as follows.

[0147] 51. Dual circulation pump (P01 / P02)

[0148] Among them, the main circulation pump can be started manually or automatically. Manual start is only applicable to maintenance mode. When running in automatic mode, the main pump started in manual mode fails. In automatic mode, the main circulation pump can accept local automatic control and remote automatic control functions. It can be stopped remotely during local automatic control, and cannot be stopped locally during remote automatic control. This requirement is not implemented for valve cooling systems without remote control. Valve cooling systems are generally equipped with soft starter control, which is only used for start control. After the start is completed, it should be transferred to bypass power frequency operation.

[0149] When the main circulation pump performs automatic start, the main circulation pump first performs soft start. After 5 seconds of soft start, the power frequency bypass contact is output, so that the main circulation pump switches to power frequency operation. At the same time, the soft starter maintains output. At this time, the soft start and power frequency contactors are simultaneously energized. The power frequency contactor is energized for 5 seconds before the soft starter is exited, realizing seamless connection between soft start and power frequency. If the soft starter fails to start due to a fault, the main circulation pump is forced to run at power frequency 5 seconds after executing the automatic start command. The control process is as follows Figure 8 shown.

[0150] For the automatic switching mode of two main circulation pumps:

[0151] Reference Fig. 9 As shown in the figure, after the P01 main pump runs continuously at power frequency without fault for 168 hours, the main circulation pump automatic switching logic is started, the P02 main pump is put into operation and the P01 main pump is stopped. (Taking the operation of the P01 main pump as an example, the main circulation pump operation time of 168 hours should be set on the operation panel).

[0152] Valve cooling system circulation pump fault switching control mode:

[0153] When the current main circulation pump is running, if the valve cooling system has the following faults, the system will automatically switch to the standby main pump and the current pump will stop. Fig.10 As shown, fault conditions include:

[0154] Main pump outlet water pressure low alarm: When the detection value of any main pump outlet water pressure transmitter is ≤ the low pressure protection set value, the control system will report the "main pump outlet water pressure low" alarm after a delay of 3 seconds.

[0155] Inlet valve low pressure alarm: When the detection value of any inlet valve pressure transmitter is ≤ the low pressure protection set value, the control system will report the "inlet valve low pressure" alarm after a delay of 3 seconds.

[0156] Main circulation pump fault alarm: When the circuit breaker in the main circulation pump power circuit is tripped or the thermal relay is activated, the control system will report a "main circulation pump fault" alarm after a delay of 500 milliseconds.

[0157] The function of switching the main pump in case of power failure alarm of equipment power supply is only applicable to the system with two AC power supplies, and the two main circulation pumps are powered by two AC power supplies respectively, that is, the I-stage AC power supply supplies the P01 main pump, and the II-stage AC power supply supplies the P02 main pump. When the main pump in operation of the valve cooling system powered by this configuration fails, after a delay of 500 milliseconds, the control system reports the corresponding AC power failure and switches the main pump. For the system that uses dual power supply switching to power the main pump, the AC power supply is switched first when a single AC power supply fails, and the original main pump continues to run after the AC power supply is switched.

[0158] Main circulation pump control circuit breaker tripping: Each main circulation pump is equipped with two control circuit breakers. When both circuit breakers of the main circulation pump control circuit are tripped during operation, the main circulation pump performs fault switching.

[0159] 52. Electric heater

[0160] Reference Fig.11 The temperature control start and stop process shown:

[0161] When the control temperature is less than or equal to the start temperature of the electric heater and also less than or equal to the stop temperature, the electric heater starts with a delay of 2 seconds without any fault.

[0162] When the control temperature is greater than the electric heater stop temperature, the electric heater stops.

[0163] Reference Fig.12 The dew point control start and stop process shown:

[0164] When the inlet valve temperature is less than or equal to the dew point +1°C and also less than or equal to the dew point +4°C, the fault-free electric heater starts with a delay of 2 seconds.

[0165] When the inlet valve temperature is greater than the electric heater stop temperature, the electric heater stops.

[0166] 53. Cooling fan

[0167] When there are a large number of cooling fans, take the example of Gaoling expansion converter station with 108 fans, of which 27 are variable frequency controlled and 81 are industrial frequency controlled. The external cooling fan should first start the variable frequency fan control, and then start the industrial frequency fan when the heat dissipation of the variable frequency fan is insufficient.

[0168] The variable frequency fans are divided into three groups with starting temperatures of 32°C, 33°C and 34°C. The starting temperature can be set on the operation panel. The target temperature of the variable frequency fans -1.5°C can be set on the operation panel. The three groups of variable frequency fans adopt a first-start-first-stop and cyclic start-stop control method.

[0169] The variable frequency fans are divided into three groups of starting temperatures: 32°C, 33°C, and 34°C. The starting temperature can be set on the operation panel. The target temperature of the variable frequency fans -1.5°C can be set on the operation panel. The three groups of variable frequency fans adopt a first-start-first-stop and cyclic start-stop control method.

[0170] The power frequency fan has three starting temperatures: 35°C, 37°C, and 39°C. The starting temperature can be set on the operation panel. The stopping temperature of the power frequency fan is the starting temperature minus 2°C. The temperature gradient of the power frequency fan can be set.

[0171] The variable frequency fans are divided into 3 groups, and the starting temperatures are 32℃, 33℃, and 34℃ respectively. The industrial frequency fans are divided into 3 groups, with 27 units in each group, and the starting temperatures are 35℃, 37℃, and 39℃ respectively.

[0172] The target temperature value should be settable on the operation panel.

[0173] Frequency conversion fan control mode:

[0174] When the inlet valve temperature is ≥32℃, start the first set of variable frequency fans, and the target temperature is controlled at -1.5℃. When the inlet valve temperature reaches 32℃, the first set of variable frequency fans starts. When the inlet valve temperature drops to 30.5℃, the frequency of the first set of inverters starts to decrease. When the inlet valve temperature is between 30.6 and 31.4℃, it is the frequency control dead zone range, and the inverter frequency remains unchanged. Only when one set of variable frequency fans is started, the cyclic start and stop logic is executed.

[0175] When the inlet valve temperature is ≥33℃, the first and second sets of variable frequency fans are started, and the target temperature is controlled at -1.5℃. When the inlet valve temperature reaches 33℃, the first and second sets of variable frequency fans are started. When the inlet valve temperature drops to 31.5℃, the frequency of the 9 inverters begins to decrease. When the inlet valve temperature is between 31.6 and 32.4℃, it is a dead zone, and the frequency of the inverter remains unchanged. The two sets of fans are started to execute the cycle start and stop logic.

[0176] When the inlet valve temperature is ≥34℃, the first, second and third groups of variable frequency fans start, and the target temperature is controlled at -1.5℃. When the inlet valve temperature drops to 32.5℃, the frequencies of the first, second and third groups of inverters begin to decrease. When the inlet valve temperature is between 32.6 and 33.4℃, it is the control dead zone range, and the inverter frequency remains unchanged.

[0177] On the other hand, an embodiment of the present invention provides a valve cooling control device, comprising:

[0178] at least one processor;

[0179] at least one memory for storing at least one program;

[0180] When the at least one program is executed by the at least one processor, the at least one processor is enabled to implement the valve cooling control method.

[0181] Similarly, the contents of the above method embodiments are all applicable to the present device embodiments. The functions specifically implemented by the present device embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0182] An embodiment of the present invention further provides a computer-readable storage medium, in which a program executable by a processor is stored. The program executable by the processor is used to execute the above-mentioned valve cooling control method when executed by the processor.

[0183] Similarly, the contents of the above method embodiments are all applicable to the present storage medium embodiments. The functions specifically implemented by the present storage medium embodiments are the same as those of the above method embodiments, and the beneficial effects achieved are also the same as those achieved by the above method embodiments.

[0184] In some selectable embodiments, the function / operation mentioned in the block diagram may not occur in the order mentioned in the operation diagram. For example, depending on the function / operation involved, the two boxes shown in succession can actually be executed substantially simultaneously or the boxes can sometimes be executed in reverse order. In addition, the embodiment presented and described in the flow chart of the present invention is provided by way of example, for the purpose of providing a more comprehensive understanding of technology. The disclosed method is not limited to the operation and logic flow presented herein. Selectable embodiments are expected, wherein the order of various operations is changed and the sub-operation of a part for which is described as a larger operation is performed independently.

[0185] In addition, although the present invention is described in the context of functional modules, it should be understood that, unless otherwise specified, one or more of the functions and / or features can be integrated into a single physical device and / or software module, or one or more functions and / or features can be implemented in a separate physical device or software module. It is also understood that a detailed discussion of the actual implementation of each module is unnecessary for understanding the present invention. More specifically, in view of the properties, functions and internal relationships of the various functional modules in the device disclosed herein, the actual implementation of the module will be understood within the conventional skills of the engineer. Therefore, those skilled in the art can implement the present invention set forth in the claims without excessive experimentation using ordinary techniques. It is also understood that the specific concepts disclosed are merely illustrative and are not intended to limit the scope of the present invention, which is determined by the full scope of the appended claims and their equivalents.

[0186] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several programs to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., which can store program codes.

[0187] The logic and / or steps represented in the flowchart or otherwise described herein, for example, may be considered as an ordered list of executable programs for implementing the logical functions, and may be embodied in any computer-readable medium for use by a program execution system, device or apparatus (such as a computer-based system, a system including a processor, or other system that can fetch and execute a program from a program execution system, device or apparatus), or in conjunction with such program execution systems, devices or apparatuses. For purposes of this specification, a "computer-readable medium" may be any device that can contain, store, communicate, propagate or transmit a program for use by a program execution system, device or apparatus, or in conjunction with such program execution systems, devices or apparatuses.

[0188] More specific examples of computer-readable media (a non-exhaustive list) include the following: an electrical connection with one or more wires (electronic device), a portable computer disk case (magnetic device), a random access memory (RAM), a read-only memory (ROM), an erasable and programmable read-only memory (EPROM or flash memory), an optical fiber device, and a portable compact disk read-only memory (CDROM). In addition, the computer-readable medium may even be a paper or other suitable medium on which the program is printed, since the program may be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, deciphering or, if necessary, processing in another suitable manner, and then stored in a computer memory.

[0189] It should be understood that the various parts of the present invention can be implemented by hardware, software, firmware or a combination thereof. In the above-mentioned embodiments, a plurality of steps or methods can be implemented by software or firmware stored in a memory and executed by a suitable program execution system. For example, if implemented by hardware, as in another embodiment, it can be implemented by any one of the following technologies known in the art or their combination: a discrete logic circuit having a logic gate circuit for implementing a logic function for a data signal, a dedicated integrated circuit having a suitable combination of logic gate circuits, a programmable gate array (PGA), a field programmable gate array (FPGA), etc.

[0190] In the above description of this specification, the description with reference to the terms "one embodiment / example", "another embodiment / example" or "certain embodiments / examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner.

[0191] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

[0192] The above is a specific description of the preferred implementation of the present invention, but the present invention is not limited to the embodiments. Those skilled in the art may make various equivalent modifications or substitutions without violating the spirit of the present invention. These equivalent modifications or substitutions are all included in the scope defined by the claims of the present invention.

Claims

1. A valve cooling control system, characterized in that: The control system comprises: a control module, an input module and a protection module; the control module comprises a first control unit and a second control unit, the input module comprises a first input unit, a second input unit and a third input unit; the protection module comprises a first protection unit, a second protection unit and a third protection unit; Wherein, the input module is used for signal collection and output; the protection module is used for trip protection output; The first control unit is connected to the operation station through the first switch, and the second control unit is connected to the operation station through the first switch, and the operation station is used to input control signals or output target results; The first control unit is connected to the protection module through a second switch, and the second control unit is connected to the protection module through a second switch; the first control unit is connected to the second control unit; The first control unit, the first input unit, the second input unit, the third input unit and the second control unit are sequentially connected via a power link ring network communication.

2. The valve cooling control system according to claim 1, characterized in that: The first input end of the first input unit is used to receive a digital input signal, and the second input end of the second input unit is used to receive a digital input signal; the control module is used to determine an out-of-tolerance alarm based on the deviation between the digital input signal received by the first input end and the digital input signal received by the second input end; the control module is used to operate on the input digital quantity to obtain a first operation result; the output end of the first input unit is used to output the first operation result, and the output end of the second input unit is used to output the first operation result.

3. The valve cooling control system according to claim 1, characterized in that: The control module is used to receive a first protection action result of the first protection unit, a second protection action result of the second protection unit, and a third protection action result of the third protection unit; And the tripping judgment logic output is based on two of the protection action results; The control module is used to output a protection action result through the second protection unit and the third protection unit if the first protection unit fails.

4. The valve cooling control system according to claim 1, characterized in that: The control module includes a redundant data synchronization unit, which is used for data synchronization between the first control unit and the second control unit. The data sent by the first control unit is transmitted to the second control unit via the redundant data synchronization unit.

5. The valve cooling control system according to claim 1, characterized in that: The input module and the protection module are used to control the dual circulation pump, the electric heater and the cooling fan.

6. A valve cooling control method, characterized in that: Applied to the valve cooling control system according to claim 1, the method comprises: receiving an input signal through the first input unit, the second input unit, and the third input unit; The first control unit and the second control unit calculate the input signal to determine the protection action result; According to the protection action result, a logic output is determined.

7. The valve cooling control method according to claim 6, characterized in that: Redundant data synchronization is achieved through the following steps: If the first control unit and the second control unit are in operation and no write output operation is performed, it is determined to perform a user data synchronization operation; the data sent by the first control unit is transmitted to the second control unit via a redundant data synchronization unit.

8. The valve cooling control method according to claim 6, characterized in that: The dual circulation pump is controlled by the following steps: After determining that the first main circulation pump executes the power frequency operation for the first time period, the second main circulation pump is soft-started; After the second time period, the soft start contactor and the power frequency contactor of the second main circulation pump are energized, and the second main circulation pump performs power frequency operation; After the third time period, the soft starter of the second main circulation pump stops running.

9. The valve cooling control method according to claim 6, characterized in that: The electric heater is controlled by the following steps: If the control temperature is less than or equal to the start temperature of the electric heater, and less than or equal to the stop temperature, it is determined that the electric heater is started with a delay without a fault; If the control temperature is greater than the stop temperature of the electric heater, the electric heater is stopped.

10. The valve cooling control method according to claim 6, characterized in that: The cooling fan is controlled by the following steps: if the inlet valve temperature is greater than or equal to the first temperature, the first group of variable frequency fans are started; if the inlet valve temperature is the second temperature, the frequency of the first group of variable frequency fans is determined to decrease; if the inlet valve temperature is in the first temperature range, the frequency of the first group of variable frequency fans is determined to remain unchanged; The second temperature is lower than the first temperature, and the second temperature is lower than any temperature in the first temperature range; If the inlet valve temperature is greater than or equal to a third temperature, the first group of variable frequency fans and the second group of variable frequency fans are started; the third temperature is greater than the first temperature.

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