Cooling system and control system of converter valve

Abstract

The invention relates to a cooling system and a control system of a converter valve. The cooling system in the control system of the converter valve comprises a cooling device, at least two photoelectric conversion modules and at least two IO modules, each photoelectric conversion module is connected with a first control system and converts a received electric signal into an optical signal and transmits the optical signal to the corresponding IO module, and the IO modules are used for transmitting the optical signal to the first control system according to the received optical signal. Outputting a control signal to the cooling equipment, wherein the control signal is used for indicating the cooling equipment to enter a starting state or a closing state; according to the cooling system, the photoelectric conversion module in redundant design is adopted to convert the electric signal output by the first control system into the optical signal and transmit the optical signal to the corresponding IO module, the stability of signal transmission is improved, any IO module can output the control signal to the cooling equipment according to the received optical signal, and the cooling efficiency is improved. And the cooling capacity of the control system of the converter valve is improved.

Description

Technical Field

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

[0002] The converter valve control system, also known as the valve cooling system, is used to control the converter valve temperature and ensure its operation within a safe temperature range. Currently, core components within this control system, such as IGBT (Insulated-Gate Bipolar Transistor) power modules, flow control valves, sensors, and control systems, are highly dependent on imports. Furthermore, due to environmental restrictions, chemical treatment of the cooling water outside the converter valve control system is not possible, leading to scaling of the cooling tower coils and reducing the cooling capacity of the converter valve control system. Summary of the Invention

[0003] Based on this, it is necessary to provide a cooling system and a control system for the converter valve to improve the cooling capacity of the control system of the converter valve in order to address the above technical problems.

[0004] In a first aspect, the present application provides a cooling system applied to a control system of a converter valve, wherein the control system of the converter valve further includes a first control system connected to the cooling system; the cooling system includes:

[0005] cooling equipment;

[0006] At least two photoelectric conversion modules, each of which is connected to the first control system, and is used to receive an electrical signal transmitted by the first control system and convert the electrical signal into an optical signal;

[0007] At least two IO modules, each IO module is connected to each photoelectric conversion module one by one, and each IO module is connected to a cooling device. The IO module is used to output a control signal to the cooling device based on the received optical signal, and the control signal is used to instruct the cooling device to enter the start state or the shutdown state.

[0008] In one embodiment, the first control system and the photoelectric conversion module are connected via a ProfiBus bus.

[0009] In one embodiment, the at least two IO modules include a master IO module and a slave IO module connected to each other;

[0010] The slave IO module is used to detect the communication status of the master IO module. When the slave IO module detects that the communication status of the master IO module is normal, the master IO module is used to output a control signal to the cooling device. When the slave IO module detects that the communication status of the master IO module is abnormal, the slave IO module is used to output a control signal to the cooling device.

[0011] In one embodiment, the master IO module is connected to the slave IO module via a communication bus, and the communication bus supports the PRP / HSR protocol;

[0012] The master IO module is used to send a heartbeat signal to the slave IO module via the communication bus, and the heartbeat signal is used to detect the communication status.

[0013] In one embodiment, the cooling system further comprises:

[0014] The device control circuit is connected to the cooling device and each IO module respectively. The device control circuit is used to instruct the cooling device to enter the startup state when it detects that the communication status of each IO module is abnormal.

[0015] In one embodiment, the device control circuit includes:

[0016] At least two monitoring relays, each monitoring relay being connected to each IO module one by one, and the monitoring relay being configured to enter a closed state when detecting that the communication status of the IO module is abnormal; wherein the monitoring relays are connected in sequence to form a series circuit;

[0017] The starting relay is connected to one end of the series circuit. The starting relay is used to control the cooling equipment to enter the starting state when all monitoring relays are in the closed state.

[0018] In one embodiment, the device control circuit further includes:

[0019] A switching device connected between the power source and the other end of the series circuit.

[0020] In one embodiment, the cooling system further comprises:

[0021] The second control system is connected to the first control system and each photoelectric conversion module respectively. The second control system is used to receive the electrical signal transmitted by the first control system and transmit the electrical signal to the photoelectric conversion module.

[0022] In one embodiment, the first control system and the second control system are connected via a MODBUS-TCP bus;

[0023] The second control system is connected to the photoelectric conversion module via an EtherCat bus.

[0024] In a second aspect, the present application further provides a control system for a converter valve, comprising a first control system and the cooling system as described above;

[0025] Wherein, the cooling system is connected to the first control system.

[0026] The above-mentioned cooling system and the control system of the converter valve, the cooling system in the control system of the converter valve includes: a cooling device, at least two photoelectric conversion modules and at least two IO modules, each photoelectric conversion module is respectively connected to the first control system, converts the received electrical signal into an optical signal and transmits it to the corresponding IO module, the IO module is used to output a control signal to the cooling device according to the received optical signal, and the control signal is used to instruct the cooling device to enter the start state or the shutdown state; the present application adds a cooling system to the control system of the converter valve, and the cooling system adopts a redundant photoelectric conversion module to convert the electrical signal output by the first control system into an optical signal and transmit it to the corresponding IO module, thereby improving the stability of signal transmission. Any IO module can output a control signal to the cooling device according to the received optical signal, thereby improving the cooling capacity of the control system of the converter valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments or the conventional technology descriptions. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0028] Figure 1 is a structural block diagram of a cooling system in one embodiment;

[0029] Figure 2 Schematic diagram of the structure of a control system of a converter valve in one embodiment;

[0030] Figure 3 is a structural block diagram of a control system of a converter valve in another embodiment;

[0031] Figure 4 is a structural block diagram of a device control circuit in one embodiment;

[0032] Figure 5 Schematic diagram of the structure of a device control circuit in one embodiment;

[0033] Figure 6 is a connection diagram of a second control system in one embodiment;

[0034] Figure 7 FIG. 1 is a structural block diagram of a control system of a converter valve in one embodiment. DETAILED DESCRIPTION

[0035] To facilitate understanding of the present application, the present application will be described more fully below with reference to the accompanying drawings. The accompanying drawings provide embodiments of the present application. However, the present application may be implemented in many different forms and is not limited to the embodiments described herein. Rather, these embodiments are provided to make the disclosure of the present application more thorough and comprehensive.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art to which this application pertains. The terms used herein in the specification of this application are for the purpose of describing specific embodiments only and are not intended to limit this application.

[0037] It will be understood that the terms "first," "second," and the like, as used herein, may be used to describe various elements herein, but these elements are not limited by these terms. These terms are used solely to distinguish a first element from another element. For example, a first control system may be referred to as a second control system, and similarly, a second control system may be referred to as a first control system, without departing from the scope of this application. The first control system and the second control system are both control systems, but they are not the same control system.

[0038] It can be understood that the “connection” in the following embodiments should be understood as “electrical connection”, “communication connection”, etc. if there is transmission of electrical signals or data between the connected circuits, modules, units, etc.

[0039] It is understood that “at least one” refers to one or more, “a plurality” refers to two or more, and “at least a portion of an element” refers to a portion or all of an element.

[0040] As used herein, the singular forms "a," "an," and "the" may also include the plural forms, unless the context clearly indicates otherwise. It should also be understood that the terms "include," "comprising," "having," and the like specify the presence of stated features, integers, steps, operations, components, parts, or combinations thereof, but do not preclude the presence or addition of one or more other features, integers, steps, operations, components, parts, or combinations thereof. Furthermore, the term "and / or" as used in this specification includes any and all combinations of the relevant listed items.

[0041] Currently, due to environmental and other restrictions, converter stations are unable to implement chemical treatment on the external cooling water of the converter valve control system (referred to as the valve cooling system). This results in scaling of the cooling tower coils, reducing the cooling capacity of the valve cooling system. To address this issue, the valve cooling system requires retrofitting. However, core components within the valve cooling system, such as IGBT power modules, flow control valves, sensors, and control systems, are heavily imported. Their design parameters, interface protocols, and control logic differ from those of domestic components. Domestic replacement of the valve cooling system requires re-adapting interfaces and control strategies, resulting in high integration complexity and long commissioning cycles. Furthermore, the ability to coordinate control between imported and domestic components is insufficient, and cross-platform communication is prone to data loss and timing errors, affecting control accuracy. This can also lead to problems such as uneven thermal stress and unbalanced flow distribution. The temperature rise of the valve cooling system fluctuates by as much as ±3°C, resulting in a high failure rate. Furthermore, existing retrofits often employ a "full system shutdown followed by complete replacement" model, lacking modular replacement and online upgrade technology. This requires interrupting HVDC project operations during the retrofit, resulting in significant economic losses.

[0042] The cooling system provided in the embodiment of the present application is provided with a photoelectric conversion module, which converts the received electrical signal of the first control system into an optical signal for transmission, effectively avoiding the problems of electrical signals being susceptible to interference and limited transmission distance, and improving control accuracy. The IO module (Input / Output) and the photoelectric conversion module both adopt a redundant design. Any IO module can output a control signal to the cooling equipment based on the received optical signal, thereby improving the cooling capacity of the control system of the converter valve and improving the reliability and fault tolerance of the control system. At the same time, the cooling system uses domestic components and adopts the same communication protocol as the first control system in the original control system, so that the cooling system can be seamlessly integrated into the existing control system. The cooling system supports hot-swappable operations, and there is no need to interrupt the operation of the high-voltage DC project during the transformation, supporting online repair and maintenance operations of the control system.

[0043] In an exemplary embodiment, Figure 1 As shown, a cooling system is provided, which is applied to a control system of a converter valve. The control system of the converter valve further includes a first control system, which is connected to the cooling system. The cooling system includes:

[0044] Cooling equipment 110;

[0045] At least two photoelectric conversion modules 120, each photoelectric conversion module 120 is connected to the first control system, and the photoelectric conversion module 120 is used to receive the electrical signal transmitted by the first control system and convert the electrical signal into an optical signal;

[0046] At least two IO modules 130 are provided, each IO module 130 is connected to each photoelectric conversion module 120 one by one, and each IO module 130 is connected to the cooling device 110. The IO module 130 is used to output a control signal to the cooling device 110 based on the received optical signal. The control signal is used to instruct the cooling device 110 to enter the start state or the shutdown state.

[0047] Among them, the type of cooling equipment can be set according to actual conditions. In the embodiment of the present application, the cooling equipment is taken as an air cooler fan as an example. It should be noted that the number of air cooler fans can be set according to actual conditions and is not limited in the embodiment of the present application; the number of photoelectric conversion modules and IO modules can be set according to actual conditions and is not limited in the embodiment of the present application.

[0048] Specifically, the first control system in the control system of the converter valve can be connected to various sensors, such as temperature sensors, pressure sensors, etc., to collect operating data. The signals collected by the first control system are usually electrical signals such as voltage signals and current signals. The control signals output by the first control system, such as PLC (Programmable Logic Controller), are also electrical signals, such as Figure 1 As shown, since the first control system and the IO system 130 may be set up in different areas, the electrical signal is easily affected by electromagnetic interference during long-distance transmission, resulting in signal distortion, which affects the reliability and stability of the control system of the converter valve. The optical signal has the advantages of strong anti-interference ability and low transmission loss. Therefore, by providing a photoelectric conversion module 120, the electrical signal transmitted by the first control system is converted into an optical signal for transmission, thereby enhancing the stability and anti-interference ability of the communication between the IO module 130 and the first control system and improving the control accuracy; the IO module 130 converts the received optical signal into an electrical signal, and outputs a control signal to the cooling device 110 according to the electrical signal. The control signal is used to instruct the cooling device 110 to enter the start state or the shutdown state.

[0049] Both the photoelectric conversion module 120 and the IO module 130 adopt a redundant design to effectively avoid the risk of downtime during production. When a communication failure occurs in any photoelectric conversion module 120 or IO module 130, the other photoelectric conversion modules 120 and IO modules 130 can complete the control of the cooling device 110, thereby improving the fault tolerance of the cooling system.

[0050] For example, the IO module 130 can be implemented using domestically produced chips. The IO module 130 covers digital and analog input and output functions such as DI (Digital Input), DO (Digital Output), AI (Analog Input), and AO (Analog Output), which are commonly required for the control system of the converter valve. It can be understood that by adopting domestic components to implement a phased domestic replacement solution for the control system, domestic IO modules are preferentially deployed in non-safety-critical loops (such as ordinary analog acquisition), and gradually expanded to digital control, ultimately achieving hybrid redundant operation of the core control loop and reducing the risk of transformation. At the same time, the introduction of domestic IO modules reduces dependence on foreign products, enhances the safety of the control system, and reduces costs.

[0051] It should be noted that the type of domestic IO modules can be set according to actual conditions to meet the needs of different application scenarios, so that the control system of the converter valve can adapt to various industrial automation applications and have strong life cycle management capabilities.

[0052] The above-mentioned cooling system includes a cooling device, at least two photoelectric conversion modules and at least two I / O modules. Each photoelectric conversion module is connected to the first control system, converts the received electrical signal into an optical signal and transmits it to the corresponding I / O module, thereby improving the stability of signal transmission. Any I / O module can output a control signal to the cooling device based on the received optical signal, thereby improving the cooling capacity of the control system of the converter valve.

[0053] In one embodiment, the first control system and the photoelectric conversion module are connected via a ProfiBus bus.

[0054] Specifically, the communication protocol between the first control system and the optoelectronic conversion module is the PROFIBUS-DP protocol. It can be understood that the first control system and the optoelectronic conversion module are connected via the ProfiBus bus. At the same time, the IO module supports the Profibus DP protocol and can be seamlessly integrated into the existing control system of the converter valve by importing the GSD file (General Station Description file).

[0055] It should be noted that the PROFIBUS-DP protocol is used to realize data transmission between the first control system and the optoelectronic conversion module, so that the data communication delay between imported equipment and domestic components is less than or equal to 2ms, and the clock deviation is less than or equal to ±1μs, which solves the data island problem of the hybrid system and improves communication efficiency.

[0056] For example, when configuring the cooling system in the existing converter valve control system, the GSD file of the domestically produced IO module can be installed and configured in the software of the first control system, the DI signal can be short-circuited externally, and the signal status can be monitored in the program. The signal status can be used to determine whether the domestically produced IO module has been connected to the first control system, thereby shortening the cycle required for functional matching verification between domestic components and imported equipment, thereby improving the MTBF (Mean Time Between Failure) of the hybrid system and reducing verification costs.

[0057] In the embodiment of the present application, the first control system and the photoelectric conversion module are connected via the ProfiBus bus, thereby realizing the connection between the cooling system and the existing control system of the converter valve, achieving compatibility between the two systems, and solving the problems of communication delay and protocol incompatibility in traditional heterogeneous systems.

[0058] In one embodiment, the at least two IO modules include a master IO module and a slave IO module connected to each other;

[0059] The slave IO module is used to detect the communication status of the master IO module. When the slave IO module detects that the communication status of the master IO module is normal, the master IO module is used to output a control signal to the cooling device. When the slave IO module detects that the communication status of the master IO module is abnormal, the slave IO module is used to output a control signal to the cooling device.

[0060] The number of slave I / O modules can be set based on actual conditions. When the communication status of the master I / O module is abnormal, any slave I / O module can switch from standby to normal. After entering normal state, the slave I / O module outputs a control signal to the cooling device based on the received optical signal. It should be noted that when the communication status of the master I / O module is normal, the slave I / O module is in standby mode. In this state, the slave I / O module receives optical signals but does not output control signals.

[0061] Specifically, using a single slave I / O module as an example, the cooling system deploys dual redundant I / O modules (one master and one slave), both connected to the same sensors and actuators (such as the air cooler fan relay). The slave I / O module also detects the communication status of the master I / O module. When the slave I / O module detects that the master I / O module's communication status is normal, the master I / O module assumes real-time control, outputting control signals to the cooling equipment based on the received optical signal. The slave I / O module continuously synchronizes data (optical signals) and remains in standby mode, saving energy. When the slave I / O module detects that the master I / O module's communication status is abnormal, it can take over control within milliseconds through a hardware watchdog circuit or FPGA logic, ensuring uninterrupted output of the air cooler fan relay. In other words, the slave I / O module then outputs control signals to the cooling equipment based on the received optical signal.

[0062] For example, the master and slave I / O modules can share input signal states (such as sensor data) and output instructions (such as relay control bits) in real time via dual-port RAM or synchronization frames. The master and slave I / O modules can maintain identical input and output data mirrors in the dual-port RAM. During switching, the slave I / O module directly inherits the mirrored data, avoiding logic errors caused by data jumps. Furthermore, the master and slave I / O modules can align data timestamps using the IEEE 1588 Precision Time Protocol, ensuring the timing consistency of received data and improving the practicality of the cooling system.

[0063] Furthermore, the converter valve control system can dynamically identify the network topology using LLDP (Link Layer Discovery Protocol), ensuring the optimal physical path between the I / O modules and actuators (such as wind turbines) after switching. The master I / O module periodically sends SYNC (synchronous pulse) signals to distributed slaves (such as remote I / O boxes). Upon taking over, the slave I / O modules immediately inherit the synchronization cycle, preventing data collection timing disruptions at the slaves.

[0064] It should be noted that the IO module can adopt deterministic Ethernet or TSN (time-sensitive network) technology to ensure the real-time data synchronization of the master IO module and the slave IO module; the master IO module and the slave IO module have built-in dual power supplies and dual communication ports, and the physical layer realizes seamless switching; the master IO module and the slave IO module are compatible with domestic PLC protocols (such as EtherCAT protocol), which can reduce protocol conversion overhead.

[0065] In an embodiment of the present application, the IO module adopts a redundant design, and the master IO module and the slave IO module are connected to the control system of the converter valve in a "hot standby dual-channel" mode. The slave IO module is used to detect the communication status of the master IO module. When it is detected that the communication status of the master IO module is abnormal, the slave IO module is used to output a control signal to the cooling device, that is, the control of the cooling device is completed by switching from the master IO module to the slave IO module, thereby improving the cooling capacity of the control system of the converter valve while improving the reliability and fault tolerance of the control system.

[0066] In order to facilitate the understanding of those skilled in the art, the control system of the converter valve is described below with reference to a specific example. Figure 2 As shown, the first control system can be the original valve cooling control system, the cooling system includes a newly added IO system and a newly added air cooler fan, the domestically produced IO A system can be the main IO module, and the domestically produced IO B system can be the slave IO module; the cooling equipment can be an air cooler fan.

[0067] like Figure 2 As shown, the existing valve cooling control system can be equipped with two CPUs (Central Processing Units), namely CPU A and CPU B, which sample and operate simultaneously, but only one is active. The existing valve cooling control system and the photoelectric conversion module are connected via ProfiBus. When the existing valve cooling control system detects the need to start or stop the air cooler fan, it outputs a corresponding switching signal (an electrical signal, such as a high or low level). This switching signal is converted by the photoelectric conversion module into an optical signal and transmitted to the corresponding I / O module (domestic I / O A system or domestic I / O B system). The I / O module then converts the optical signal back into an electrical signal. Based on this electrical signal, the I / O module controls the on / off of the air cooler fan power circuit, thereby starting and stopping the air cooler fan. For example, when it is detected that the control system temperature of the converter valve exceeds the set upper limit, the original valve cooling control system outputs a high-level signal. After transmission through the photoelectric conversion module, the IO module controls the power supply to start the air cooler fan. When the control system temperature of the converter valve drops to the set lower limit, the first control system outputs a low-level signal. After transmission through the photoelectric conversion module, the IO module controls the air cooler fan to stop running.

[0068] Furthermore, if the air cooler fan utilizes variable frequency speed regulation technology, the first control system can also output an analog signal (such as a 4-20mA current signal or a 0-10V voltage signal) to adjust the air cooler fan's operating frequency based on actual operating conditions. This analog electrical signal is first converted into an optical signal by the optoelectronic conversion module and transmitted to the I / O module, which then converts the optical signal back into an analog electrical signal. The IO module then transmits the received analog signal to the inverter, which adjusts its output frequency based on the received signal, thereby changing the air cooler fan's speed. For example, when the heat load of the converter valve control system is high, the existing valve cooling control system outputs a high analog signal. After transmission through the optoelectronic conversion module, the IO module instructs the inverter to increase its output frequency, accelerating the air cooler fan's speed and increasing cooling air volume. When the heat load of the converter valve control system decreases, the existing valve cooling control system outputs a low analog signal. After transmission through the optoelectronic conversion module, the IO module instructs the inverter to reduce its output frequency, slowing the air cooler fan's speed and saving energy.

[0069] It should be noted that the type of electrical signal output by the first control system can be set according to actual conditions and is not limited in the embodiments of this application. The IO module can be configured with an alarm output function. When an abnormality is detected in the received electrical signal, the IO module outputs an alarm signal that can be used to drive an audible and visual alarm to remind the user to take timely action.

[0070] In one embodiment, the master IO module is connected to the slave IO module via a communication bus, and the communication bus supports the PRP / HSR protocol;

[0071] The master IO module is used to send a heartbeat signal to the slave IO module via the communication bus, and the heartbeat signal is used to detect the communication status.

[0072] Specifically, the master IO module is connected to the slave IO module via a communication bus. It is understood that the master IO module and the slave IO module are connected via independent communication channels, thereby maintaining state synchronization and avoiding single points of failure. It should be noted that the master IO module and the slave IO module can maintain state synchronization via an independent bus or a dedicated redundant link (such as a high-speed backplane or Ethernet Redundancy Protocol PRP / HSR).

[0073] For example, the master I / O module can periodically (e.g., every 10ms) send heartbeat signals to the slave I / O modules. If the slave I / O module does not receive the heartbeat signal within a timeout threshold (e.g., 100ms), it determines that the master I / O module's communication status is abnormal. The slave I / O module can also verify the rationality of the master I / O module's input and output data (e.g., value range, rate of change) to assist in determining whether the master I / O module has experienced a communication anomaly or logic error.

[0074] It should be noted that switchover events between the master and slave I / O modules can be pushed in real time via the OPC UA publish / subscribe model. Both modules have built-in SNMP agents that send trap messages to the network management platform upon switchover, triggering SMS / email notifications to maintenance users. Both modules have built-in non-volatile memory that records snapshots of key data before and after the switchover (such as input status 10ms before the fault and switchover timestamps) to support post-event analysis. Switchover events are uploaded to the MES system via the MQTT protocol, triggering the automatic generation of work orders and scheduling preventive maintenance.

[0075] In an embodiment of the present application, the master IO module is connected to the slave IO module via a communication bus to realize the collection of heartbeat signals between the master IO module and the slave IO module. When it is detected that the communication status of the master IO module is abnormal, it is quickly switched to the slave IO module to realize control of the cooling equipment, thereby improving the reliability of the control system of the converter valve.

[0076] To facilitate understanding by those skilled in the art, the steps of detecting the heartbeat signal of the master IO module are described below with reference to a specific example:

[0077] The master I / O module stops outputting heartbeat signals due to communication interruption. The slave I / O module detects the loss of the master I / O module's heartbeat and starts the fault timer.

[0078] After the fault timer times out, the slave IO module immediately takes over the control of the communication bus through the hardware switching circuit, reads the latest output status synchronized in the dual-port RAM from the IO module, and maintains the original control signal of the relay.

[0079] The slave IO module reports faults to the host computer and records logs, supporting subsequent manual intervention or automatic switchback after the main IO module is repaired.

[0080] In one embodiment, Figure 3 As shown, the cooling system also includes:

[0081] The device control circuit 140 is connected to the cooling device 110 and each IO module 130 . The device control circuit 140 is used to instruct the cooling device 110 to enter the startup state when detecting that the communication status of each IO module 130 is abnormal.

[0082] Specifically, if Figure 3 As shown, considering that a communication failure may cause the cooling equipment to stop and bring adverse effects on the operation of the converter valve, a device control circuit 140 is configured. When an abnormality occurs in the communication between each IO module 130 and the first control system, the device control circuit 140 will force the cooling equipment to enter the startup state to ensure the cooling capacity of the control system of the converter valve.

[0083] In an embodiment of the present application, a device control circuit is provided so that when the communication status of each IO module is abnormal, the device control circuit can instruct the cooling device to enter the startup state, thereby ensuring the cooling capacity of the control system of the converter valve.

[0084] In one embodiment, Figure 4 As shown, the device control circuit includes:

[0085] At least two monitoring relays, each monitoring relay being connected to each IO module one by one, and the monitoring relay being configured to enter a closed state when detecting that the communication status of the IO module is abnormal; wherein the monitoring relays are connected in sequence to form a series circuit;

[0086] The starting relay is connected to one end of the series circuit. The starting relay is used to control the cooling equipment to enter the starting state when all monitoring relays are in the closed state.

[0087] The number of monitoring relays can be set according to actual conditions, as long as the number can satisfy the requirement that one IO module corresponds to one monitoring relay.

[0088] Specifically, when any IO module communicates normally, the start relay maintains its output, and the cooling system is in normal control mode. The normally closed contact of the monitoring relay corresponding to that IO module is open, and the cooling equipment is controlled by the IO module according to normal control strategies, such as adjusting the start, stop, and speed of the cooling equipment based on parameters such as temperature and pressure. When all IO modules communicate abnormally, the start relay stops outputting, and the normally closed contacts of the monitoring relays close. The cooling system enters emergency mode, forcibly starting the cooling equipment to ensure the cooling effect of the converter valve control system and avoid overheating and other problems caused by communication failures.

[0089] It should be noted that the other end of the series circuit can be connected to a power supply. When all IO modules communicate abnormally, the start relay stops outputting, the normally closed contacts of each monitoring relay close, and the cooling equipment is powered on and enters the startup state.

[0090] For example, the starting relay can be set outside the cooling device or inside the cooling device, which is not limited in the embodiments of the present application; the number of starting relays can be set according to actual conditions, which is not limited in the embodiments of the present application.

[0091] In an embodiment of the present application, at least two monitoring relays and a starting relay are provided in the device control circuit, so that when the communication status of each IO module is abnormal, the monitoring relays all enter a closed state, and the starting relay controls the cooling device to enter a starting state, thereby ensuring the cooling capacity of the control system of the converter valve.

[0092] In one embodiment, the device control circuit further includes:

[0093] A switching device connected between the power source and the other end of the series circuit.

[0094] Among them, the type of switching device can be set according to actual conditions and is not limited in the embodiments of this application.

[0095] Specifically, the switch device can be used to switch between different control modes, select different devices, or change the operating state of the cooling system. For example, in the device control circuit, the switch device can be used to select manual control mode and automatic control mode. When the switch device is in the manual position, the operator can directly control the start and stop of the cooling device through buttons or other methods. When the switch device is in the automatic position, the cooling device is automatically controlled by the I / O module according to the above logic.

[0096] In order to facilitate the understanding of those skilled in the art, the device control circuit is described below with reference to a specific example. Figure 5 As shown, the following example is used to illustrate the configuration of 2 monitoring relays and 4 starting relays in the equipment control circuit:

[0097] Two monitoring relays are configured in the equipment control circuit. Their normally closed contacts are used to control the fans (cooling equipment) of the newly added air coolers. When the I / O module is communicating normally, the connected monitoring relay maintains its output, the normally closed contact opens, and the fans are controlled by the I / O module. If I / O module communication is interrupted or an abnormality occurs, the connected monitoring relay stops outputting, the normally closed contact closes, and the start relay connects to power, forcing all air cooler fans to start.

[0098] The selector switch (SA) can be used to switch between manual and automatic control modes. When the switch is in the manual position, the user can directly control the start and stop of the cooling device using buttons or other methods. When the switch is in the automatic position, the cooling device is automatically controlled by the I / O module according to the aforementioned logic.

[0099] In one embodiment, the cooling system further comprises:

[0100] The second control system is connected to the first control system and each photoelectric conversion module respectively. The second control system is used to receive the electrical signal transmitted by the first control system and transmit the electrical signal to the photoelectric conversion module.

[0101] Specifically, the secondary control system utilizes dual-machine hot standby hardware redundancy to effectively prevent production downtime. Fault tolerance is achieved through two parallel central controllers (CPUs), connected via a synchronous bus and controlling redundant I / O modules via redundant EtherCAT lines. In the event of an error, a disturbance-free control transfer occurs, meaning the unaffected hot standby CPU continues execution at the point of interruption without any information loss.

[0102] It should be noted that in order to achieve technological breakthroughs in core equipment and get rid of the problem of the converter valve control system being highly dependent on imported equipment, thereby improving the practicality and reliability of products in the DC field, the second control system can be implemented using domestic components. Taking the domestic IL40 redundant control system as an example, the IL40 series PLC has the functions of smooth master-slave switching, automatic event synchronization, integrated error identification and error location, automatic re-entry after CPU repair, online replacement of all components during operation, disturbance-free CPU switching, no information loss, no alarm, and no interruption loss.

[0103] For example, the first control system can be implemented using an imported Siemens S7-400H series PLC, such as Figure 6 As shown, the first control system can be the on-board valve cooling control system, and the second control system can be the dwarf autonomous controllable valve cooling control system. It can be understood that the two sets of redundant control and protection systems (on-board valve cooling control system and external autonomous controllable valve cooling control system) sample and work at the same time, but only one is in the active state.

[0104] Two redundant control and protection systems—the primary and secondary control systems—sample and operate simultaneously, but only one remains active. If both fail, the system ceases operation. The secondary control system can operate continuously in environments with high electrical noise, radio interference, and vibration. It remains operational even in the presence of electromagnetic interference (EMI) and radio frequency interference (RFI) at frequencies of 400-500MHz and 5W at a distance of 1.2 meters from electronic equipment.

[0105] In the embodiment of the present application, a second control system is configured and a redundant design is adopted to effectively avoid the risk of shutdown during production, thereby improving the fault tolerance of the control system of the converter valve.

[0106] In one embodiment, Figure 6 As shown, the first control system and the second control system are connected via a MODBUS-TCP bus;

[0107] The second control system is connected to the photoelectric conversion module via an EtherCat bus.

[0108] Specifically, the first control system and the second control system perform data synchronization via the MODBUS-TCP bus, and the second control system transmits the electrical signal to the photoelectric conversion module via the EtherCat bus.

[0109] In an exemplary embodiment, Figure 7 As shown, a control system for a converter valve is provided, comprising a first control system 10 and the cooling system 20 as described above;

[0110] The cooling system 20 is connected to the first control system 10 .

[0111] Specifically, the cooling system 20 is equipped with a photoelectric conversion module to convert the electrical signals received from the first control system 10 into optical signals for transmission, effectively avoiding the problems of electrical signals being susceptible to interference and limited transmission distance, thereby improving control accuracy. The IO module (Input / Output) and the photoelectric conversion module both adopt a redundant design. Any IO module can output a control signal to the cooling equipment based on the received optical signal, thereby improving the cooling capacity of the control system of the converter valve and improving the reliability and fault tolerance of the control system.

[0112] In the description of this specification, reference to the terms "some embodiments" or "other embodiments" 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 application. In this specification, the schematic descriptions of the above terms do not necessarily refer to the same embodiment or example.

[0113] The technical features of the above-mentioned embodiments can be combined arbitrarily. In order to make the description concise, not all possible combinations of the technical features in the above-mentioned embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0114] The above-described embodiments merely represent several implementation methods of the present application. While the descriptions are relatively specific and detailed, they should not be construed as limiting the scope of the present application. It should be noted that a person of ordinary skill in the art may make various modifications and improvements without departing from the spirit of the present application, and these modifications and improvements fall within the scope of protection of the present application. Therefore, the scope of protection of the present application shall be determined by the appended claims.

Claims

1. A cooling system, characterized in that: The control system for the converter valve further includes a first control system connected to the cooling system; the cooling system includes: cooling equipment; at least two photoelectric conversion modules, each of which is connected to the first control system, and is used to receive an electrical signal transmitted by the first control system and convert the electrical signal into an optical signal; At least two IO modules, each of which is connected one by one to each of the photoelectric conversion modules, and each of which is connected to the cooling device. The IO module is used to output a control signal to the cooling device based on the received optical signal, and the control signal is used to instruct the cooling device to enter the start state or the shutdown state.

2. The cooling system according to claim 1, characterized in that The first control system is connected to the photoelectric conversion module via a ProfiBus bus.

3. The cooling system according to claim 1, characterized in that At least two of the IO modules include a master IO module and a slave IO module connected to each other; The slave IO module is used to detect the communication status of the master IO module. When the slave IO module detects that the communication status of the master IO module is normal, the master IO module is used to output the control signal to the cooling device. When the slave IO module detects that the communication status of the master IO module is abnormal, the slave IO module is used to output the control signal to the cooling device.

4. The cooling system according to claim 3, characterized in that The master IO module is connected to the slave IO module via a communication bus, and the communication bus supports the PRP / HSR protocol; The master IO module is used to send a heartbeat signal to the slave IO module via the communication bus, and the heartbeat signal is used to detect the communication status.

5. The cooling system according to claim 1, wherein: The cooling system further comprises: The device control circuit is connected to the cooling device and each of the IO modules, and is used to instruct the cooling device to enter a startup state when it is detected that the communication status of each of the IO modules is abnormal.

6. The cooling system according to claim 5, characterized in that The device control circuit includes: at least two monitoring relays, each of which is connected to each of the IO modules, and configured to enter a closed state upon detecting that the communication status of the IO module is abnormal; wherein the monitoring relays are connected in sequence to form a series circuit; A starting relay is connected to one end of the series circuit, and is used to control the cooling device to enter a starting state when all the monitoring relays are in a closed state.

7. The cooling system according to claim 6, characterized in that The device control circuit further includes: A switching device is connected between the power source and the other end of the series circuit.

8. The cooling system according to claim 1, wherein: The cooling system further comprises: The second control system is connected to the first control system and each of the photoelectric conversion modules respectively. The second control system is used to receive the electrical signal transmitted by the first control system and transmit the electrical signal to the photoelectric conversion module.

9. The cooling system according to claim 8, characterized in that The first control system and the second control system are connected via a MODBUS-TCP bus; The second control system is connected to the photoelectric conversion module via an EtherCat bus.

10. A control system for a converter valve, characterized in that: comprising a first control system, and a cooling system according to any one of claims 1 to 9; Wherein, the cooling system is connected to the first control system.

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