Split system real-time following system and method based on serial communication

Abstract

The invention provides a discrete system real-time following system and method based on serial communication. The system comprises a first valve control subsystem and a second valve control subsystem. The first valve control subsystem comprises a first logic processing unit and a first encoding and decoding unit; the second valve control subsystem comprises a second logic processing unit and a second encoding and decoding unit; the first logic processing unit is connected with an external converter valve through the first coding and decoding unit; the second logic processing unit is connected with an external converter valve through the second coding and decoding unit; serial communication is adopted between the first logic processing unit and the second logic processing unit, so that the first valve control subsystem and the second valve control subsystem are in a master-slave state. Since the first logic processing unit of the first valve control subsystem and the second logic processing unit of the second valve control subsystem interact with each other in a series connection mode, the first valve control subsystem and the second valve control subsystem can be prevented from being in a master or slave state at the same time, and control failure of the converter valve is avoided.

Description

Technical Field

[0001] The invention belongs to the technical field of valve control systems for direct current power transmission, and in particular relates to a discrete system real-time following system and method based on serial communication. Background Art

[0002] The valve-based electronic device (VBE) is the core control device for the converter valve to achieve AC-DC power conversion. Its basic function is to control and protect the converter valve. At the same time, the VBE itself should have a complete self-test function. VBE is the lowest-level control and protection device of the converter valve, and its operating reliability directly affects the operating stability of the entire DC transmission line. The operational complexity of the DC transmission converter valve determines the difficulty of VBE design.

[0003] The engineering application foundation of the existing converter valve control system is relatively weak. In order to meet the current needs of autonomous, controllable and safe development, higher system "fault tolerance" design requirements are proposed, and the redundant reliability requirements of the valve control system for "lower performance" components are increased.

[0004] like Figure 1 As shown, the VBE equipment mainly consists of two groups A and B, trigger and monitoring chassis, two groups A and B communication and control chassis and recording chassis. According to the overall division, such as Figure 2 As shown in the figure, the VBE device can be divided into two systems, A and B, and connected to the TE (thyristor trigger monitoring module) board externally. The A and B systems share a trigger and monitoring chassis, and the information exchange between the two systems is internal to the chassis. In a fully redundant structure, the A and B systems are located in different trigger and monitoring chassis with completely identical and redundant hardware.

[0005] The fully redundant design of the valve control equipment may cause the two systems to be the same master or the same slave during the master-slave switching period, which may lead to the failure of the converter valve control or even the lock of the converter valve. Summary of the invention

[0006] In order to overcome the above-mentioned deficiencies of the prior art, in a first aspect, the present invention proposes a discrete system real-time following system based on serial communication, the system comprising: a first valve control subsystem and a second valve control subsystem; the first valve control subsystem comprises a first logic processing unit and a first codec unit; the second valve control subsystem comprises a second logic processing unit and a second codec unit;

[0007] The first logic processing unit is connected to an external flow conversion valve through the first codec unit; the second logic processing unit is connected to the external flow conversion valve through the second codec unit;

[0008] The first logic processing unit and the second logic processing unit use serial communication to realize the master-slave state of the first valve control subsystem and the second valve control subsystem.

[0009] Preferably, a high-speed serial communication protocol and field programmable gate array parallel processing technology are used between the first logic processing unit and the second logic processing unit to form a serial transmission link.

[0010] Preferably, a high-speed serial communication protocol is implemented between the first logic processing unit and the second logic processing unit using optical fiber.

[0011] Preferably, the first valve control subsystem and the second valve control subsystem are powered by independent power supplies respectively.

[0012] Preferably, the first logic processing unit and the second logic processing unit realize the master-slave state of the first valve control subsystem and the second valve control subsystem by exchanging the master-slave signal state and channel state of the first valve control subsystem and the second valve control subsystem.

[0013] Preferably, the converter valve comprises: a thyristor trigger monitoring module and a thyristor;

[0014] The thyristor is connected to the thyristor trigger monitoring module for communication; the first logic processing unit and the second logic processing unit are connected to the thyristor trigger monitoring module for communication and interaction respectively;

[0015] The thyristor is used to receive a trigger command from the thyristor trigger monitoring module, and is triggered according to the trigger command to realize the conduction of the converter valve.

[0016] Preferably, the first valve control subsystem further includes: a first electro-optical conversion module; the first electro-optical conversion module is respectively connected to the first encoding and decoding unit and the thyristor trigger monitoring module for communication;

[0017] The second valve control subsystem further includes: a second electro-optical conversion module; the second electro-optical conversion module is communicatively connected with the second encoding and decoding unit and the thyristor trigger monitoring module respectively.

[0018] Preferably, the first electro-optical conversion module includes a first electro-optical conversion transmitting board and a first electro-optical conversion receiving board; the second electro-optical conversion module includes a second electro-optical conversion transmitting board and a second electro-optical conversion receiving board;

[0019] The first electro-optical conversion transmitting board is used to receive the signal of the first encoding and decoding unit, and transmit the signal to the thyristor trigger monitoring module after conversion; the first electro-optical conversion receiving board is used to receive the signal of the thyristor trigger monitoring module, and transmit the signal to the first encoding and decoding unit after conversion;

[0020] The second electro-optical conversion transmitting board is used to receive the signal of the thyristor trigger monitoring module, and send the converted signal to the second encoding and decoding unit; the second electro-optical conversion receiving board is used to receive the signal of the thyristor trigger monitoring module, and send the converted signal to the second encoding and decoding unit.

[0021] Preferably, the system further comprises: a control and protection module, wherein the control and protection module is communicatively connected with the converter valve;

[0022] The control and protection module is used to issue an alarm message when the converter valve is abnormal; the alarm message includes a signal reminder message of insufficient redundancy of the thyristors in the converter valve.

[0023] In a second aspect, the present invention also proposes a discrete system real-time following method based on serial communication, the method comprising:

[0024] Serial communication is adopted between the first logic processing unit in the first valve control subsystem and the second logic processing unit in the second valve control subsystem to realize the master-slave state of the first valve control subsystem and the second valve control subsystem.

[0025] In a third aspect, the present invention application further proposes an electronic device, comprising: at least one processor and a memory; the memory and the processor are connected via a bus;

[0026] The memory is used to store one or more programs;

[0027] When the one or more programs are executed by the at least one processor, the discrete system real-time following method based on serial communication is implemented.

[0028] In a fourth aspect, the present invention application further proposes a readable storage medium having an execution program stored thereon, and when the execution program is executed, the discrete system real-time following method based on serial communication is implemented.

[0029] Compared with the closest prior art, the present invention has the following beneficial effects:

[0030] The present invention discloses a discrete system real-time following system and method based on serial communication, the system comprising: a first valve control subsystem and a second valve control subsystem; the first valve control subsystem comprises a first logic processing unit and a first codec unit; the second valve control subsystem comprises a second logic processing unit and a second codec unit; the first logic processing unit is connected to an external converter valve through the first codec unit; the second logic processing unit is connected to the external converter valve through the second codec unit; the first logic processing unit and the second logic processing unit adopt serial communication to realize the master-slave state of the first valve control subsystem and the second valve control subsystem. Since the first logic processing unit of the first valve control subsystem and the second logic processing unit of the second valve control subsystem interact with each other in a serial manner, the state where the first valve control subsystem and the second valve control subsystem are both master or slave at the same time can be avoided; the problem of failure of converter valve control or even converter valve locking can be avoided. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 System architecture diagram of a VBE device in the prior art;

[0032] Figure 2 System architecture diagram of the two systems A and B in the prior art;

[0033] Figure 3 An architectural diagram of a discrete system real-time following system based on serial communication provided by the present invention;

[0034] Figure 4 An architectural diagram of a system involved in a discrete system real-time following method based on serial communication provided by the present invention;

[0035] Figure 5 A schematic diagram of the operation of an electronic device provided in the present invention application. DETAILED DESCRIPTION

[0036] The specific implementation methods of the present invention are further described in detail below with reference to the accompanying drawings.

[0037] Embodiment 1:

[0038] like Figure 3 As shown, the present invention application proposes a discrete system real-time following system based on serial communication, the system comprising: a first valve control subsystem and a second valve control subsystem; the first valve control subsystem comprises a first logic processing unit and a first codec unit; the second valve control subsystem comprises a second logic processing unit and a second codec unit;

[0039] The first logic processing unit is connected to an external flow conversion valve through the first codec unit; the second logic processing unit is connected to the external flow conversion valve through the second codec unit;

[0040] The first logic processing unit and the second logic processing unit use serial communication, the first valve control subsystem and the second valve control subsystem are completely consistent, and during normal operation, one of them is used as the master system and the other is used as the slave system, so that the first valve control subsystem and the second valve control subsystem are in the master-slave state. When a fault is handled on one of the systems, the normal operation of the other system is not affected.

[0041] Furthermore, the first logic processing unit and the second logic processing unit use a high-speed serial communication protocol and field programmable gate array parallel processing technology to form a serial transmission link, which can shorten the master-slave system recognition time from milliseconds to microseconds.

[0042] Furthermore, the first logic processing unit and the second logic processing unit use optical fiber to implement a high-speed serial communication protocol, and the state interaction and logic interaction between the master and slave systems are both performed using high-speed serial optical fiber communication.

[0043] Furthermore, the first valve control subsystem and the second valve control subsystem are powered by independent power supplies respectively. Two completely independent power supplies are powered simultaneously, and if one power supply fails, the operation of the first valve control subsystem and the second valve control subsystem will not be affected.

[0044] Furthermore, the first logic processing unit and the second logic processing unit realize the master-slave state of the first valve control subsystem and the second valve control subsystem by exchanging the master-slave signal state and channel state of the first valve control subsystem and the second valve control subsystem. During system operation, only one of the first valve control subsystem and the second valve control subsystem can be in the master state, and the other can be in the slave state, and the two systems can monitor and follow independently in real time.

[0045] Furthermore, the converter valve comprises: a thyristor trigger monitoring module and a thyristor;

[0046] The thyristor is connected to the thyristor trigger monitoring module for communication; the first logic processing unit and the second logic processing unit are connected to the thyristor trigger monitoring module for communication and interaction respectively;

[0047] The thyristor is used to receive a trigger command from the thyristor trigger monitoring module, and is triggered according to the trigger command to realize the conduction of the converter valve.

[0048] Furthermore, the first valve control subsystem further includes: a first electro-optical conversion module; the first electro-optical conversion module is respectively connected to the first encoding and decoding unit and the thyristor trigger monitoring module for communication;

[0049] The second valve control subsystem further includes: a second electro-optical conversion module; the second electro-optical conversion module is communicatively connected with the second encoding and decoding unit and the thyristor trigger monitoring module respectively.

[0050] Further, the first electro-optical conversion module includes a first electro-optical conversion transmitting board and a first electro-optical conversion receiving board; the second electro-optical conversion module includes a second electro-optical conversion transmitting board and a second electro-optical conversion receiving board;

[0051] The first electro-optical conversion transmitting board is used to receive the signal of the first encoding and decoding unit, and transmit the signal to the thyristor trigger monitoring module after conversion; the first electro-optical conversion receiving board is used to receive the signal of the thyristor trigger monitoring module, and transmit the signal to the first encoding and decoding unit after conversion; the first electro-optical conversion transmitting board and the first electro-optical conversion receiving board convert the optical and electrical signals in the interaction into each other, thereby improving the efficiency of the interaction.

[0052] The second electro-optical conversion transmitting board is used to receive the signal of the thyristor trigger monitoring module, and send the signal to the second encoding and decoding unit after conversion; the second electro-optical conversion receiving board is used to receive the signal of the thyristor trigger monitoring module, and send the signal to the second encoding and decoding unit after conversion. The second electro-optical conversion transmitting board and the second electro-optical conversion receiving board convert the optical and electrical signals in the interaction to each other, thereby improving the efficiency of the interaction.

[0053] Furthermore, the system further comprises: a control and protection module, wherein the control and protection module is communicatively connected with the converter valve;

[0054] The control and protection module is used to issue an alarm message when the converter valve is abnormal; the alarm message includes a signal reminder message of insufficient redundancy of the thyristors in the converter valve, etc.

[0055] In summary, in the system of the present invention, when the first valve control subsystem and the second valve control subsystem are operating normally, one of the first valve control subsystem and the second valve control subsystem serves as the master system and the other serves as the slave system. The first valve control subsystem and the second valve control subsystem are powered by two completely independent power supplies at the same time, wherein the power failure of one power supply in the first valve control subsystem or the second valve control subsystem does not affect the operation of the other first valve control subsystem or the second valve control subsystem. The information interaction between the two systems is independent and optical fiber communication is used for interaction. Compared with the system of the background technology, the communication mode between the master and slave systems changes. The use of mutually independent power supply systems facilitates the replacement of a single system. The first valve control subsystem and the second valve control subsystem of the present invention can have no shared hardware equipment, and it is convenient to use a discrete chassis design, and the information between the two systems is communicated through optical fiber. The discrete chassis design of the valve control redundant system and the master-slave synchronous coordinated control are realized, breaking through the historical limitation that the optical conversion transmitting board, the optical conversion receiving board and the trigger optical fiber cannot be replaced online. The technical solution of the present invention has been currently applied to the valve control system of the Tianshengqiao / Guangzhou Station Changzhi converter valve, and it operates stably.

[0056] Embodiment 2:

[0057] The present invention application proposes a discrete system real-time following method based on serial communication, the method comprising:

[0058] Serial communication is adopted between the first logic processing unit in the first valve control subsystem and the second logic processing unit in the second valve control subsystem to realize the master-slave state of the first valve control subsystem and the second valve control subsystem.

[0059] High-speed serial communication and FPGA (Field Programmable Gate Array) parallel processing technology can be used between the first valve control subsystem or the second valve control subsystem, so the first valve control subsystem or the second valve control subsystem is the master and slave system, and the identification time of the master and slave systems is shortened from milliseconds to microseconds. Secondly, a discrete system delay synchronization method can be proposed between the first valve control subsystem or the second valve control subsystem based on serial communication. Only one of the master and slave systems can be in the master state, and the other system can be in the slave state. The master and slave systems are independently monitored, and the slave system follows the master system in real time. The state interaction and logical interaction of the master and slave systems can all be interacted using high-speed serial optical fiber communication. The communication speed can be based on the optical receiving module HFBR-2412TZ, and the communication rate can reach more than 10Mbaud / s. When the first valve control subsystem and the second valve control subsystem interact with each other through optical fiber, the communication content is the master-slave signal status and channel status of the first valve control subsystem and the second valve control subsystem. The system of the present invention avoids the abnormal state of the first valve control subsystem and the second valve control subsystem being the master or the slave at the same time due to the master and slave status received through interactive communication. The logical interaction and status interaction of the master and slave systems are associated with each other through software, which ensures the high speed of the communication transmission mode and reduces the content of the interaction between the master and slave systems.

[0060] Embodiment 3:

[0061] like Figure 4 As shown, the present invention application proposes a specific use case of a discrete system real-time following method based on serial communication, including: during operation, serial communication is adopted between a first logic processing unit in a first valve control subsystem and a second logic processing unit in a second valve control subsystem to realize the master-slave state of the first valve control subsystem and the second valve control subsystem.

[0062] During operation, optical fiber is used to implement a high-speed serial communication protocol between the first logic processing unit and the second logic processing unit, and a high-speed serial communication protocol and field programmable gate array parallel processing technology can be used between the first logic processing unit and the second logic processing unit to form a serial transmission link;

[0063] At the same time, considering that the first valve control subsystem and the second valve control subsystem are independent and do not affect each other, the first valve control subsystem and the second valve control subsystem are respectively connected to independent power supplies for power supply;

[0064] The first logic processing unit interacts with the second logic processing unit, and the content of the interaction is the master-slave signal state of the first valve control subsystem and the second valve control subsystem, and the channel state between the first valve control subsystem and the second valve control subsystem, so as to realize the master-slave state of the first valve control subsystem and the second valve control subsystem;

[0065] In addition, the converter valve in the system of the present invention includes: a thyristor trigger monitoring module and a thyristor, the thyristor is communicatively connected with the thyristor trigger monitoring module; the first logic processing unit and the second logic processing unit are communicatively connected and interacted with the thyristor trigger monitoring module respectively; when the thyristor receives the trigger command of the thyristor trigger monitoring module, it is triggered according to the trigger command, and triggers itself to turn on, thereby realizing the conduction of the converter valve; the main function of the thyristor is to control the conduction and closing of the converter valve.

[0066] The first valve control subsystem also includes: a first electro-optical conversion module; the first electro-optical conversion module is respectively communicated with the first encoding and decoding unit and the thyristor trigger monitoring module; the first electro-optical conversion module is respectively communicated with the first encoding and decoding unit and the thyristor trigger monitoring module; the first electro-optical conversion module includes a first electro-optical conversion transmitting board and a first electro-optical conversion receiving board, the first electro-optical conversion transmitting board is used to receive the signal of the first encoding and decoding unit, and transmit the signal to the thyristor trigger and monitoring module after conversion; the first electro-optical conversion receiving board is used to receive the signal of the thyristor trigger and monitoring module, and transmit the signal to the first encoding and decoding unit after conversion; it is intended to realize the mutual interaction between the first valve control subsystem and the thyristor trigger monitoring module, and the first electro-optical conversion transmitting board and the first electro-optical conversion receiving board convert the optical and electrical signals in the interaction to each other, thereby improving the efficiency of the interaction.

[0067] The second valve control subsystem also includes: a second electro-optical conversion module; the second electro-optical conversion module is respectively connected to the second codec unit and the thyristor trigger monitoring module. The second electro-optical conversion module is respectively connected to the second codec unit and the thyristor trigger monitoring module, and the second electro-optical conversion module includes a second electro-optical conversion transmitting board and a second electro-optical conversion receiving board. The second electro-optical conversion transmitting board is used to receive the signal of the thyristor trigger and monitoring module, and send the signal to the second codec unit after conversion; the second electro-optical conversion receiving board is used to receive the signal of the thyristor trigger and monitoring module, and send the signal to the second codec unit after conversion, aiming to realize the mutual interaction between the second valve control subsystem and the thyristor trigger monitoring module, and the second electro-optical conversion transmitting board and the second electro-optical conversion receiving board mutually convert the optical and electrical signals in the interaction, thereby improving the efficiency of the interaction. The background technology of the present invention is that in the non-completely redundant structure of the VBE device, the A and B systems share a trigger and monitoring chassis, and the information between the two systems is exchanged through the inside of the chassis. The first valve control subsystem and the second valve control subsystem of the present invention can have no shared hardware equipment, and the information between the two systems is communicated through optical fiber.

[0068] It is understandable that:

[0069] With the implementation of the "dual carbon" strategy, large-scale grid connection of new energy and large-scale access to interactive devices such as electric vehicles and distributed energy, the power system will show the "dual high" characteristics of a high proportion of new energy and a high proportion of power electronics. The system's frequency regulation capability will drop significantly and its anti-disturbance capability will be further weakened. At the same time, my country will continue to build multiple UHV DC projects to transport new energy from the west to the eastern load center, and the DC landing points will be more dense.

[0070] my country has built and put into operation nearly 40 high-voltage direct current transmission projects, with 13 in East China and 9 in Guangdong, forming a group of DC transmission and receiving terminals with dense locations. As the number of UHV DC locations continues to grow, power grids in East China, South China and other regions will form denser multi-feed DC systems, with closer coupling between stations and more serious multi-station interlocking commutation failures. By then, the stability and fault tolerance of the DC equipment valve control system will face great challenges.

[0071] Due to the particularity of domestic industrial technology development and power grid security, the engineering application foundation of domestic components in the existing converter valve control system is relatively weak; at the same time, the operation mode of the large power grid puts forward the extreme requirement of "available at any time" for the safety and reliability of the power channel. It is required that the failure of the valve control system does not affect the normal operation of the DC system, and the valve control system fault handling can achieve DC non-stop operation as much as possible, with full redundancy and reliable online maintenance technology.

[0072] The discrete system real-time following technology based on serial communication can ensure that the VBE equipment can realize the discrete chassis design of the valve control redundant system and the master-slave synchronous coordinated control, breaking through the limitation that the optical receiving board and the transmitting board cannot be replaced online. It can realize the full redundancy of the VBE equipment and improve the reliability of the equipment. Therefore, it is necessary to develop a communication mechanism that enables the valve control equipment to meet the control requirements of the converter valve when the dual system equipment of the (valve-based electronic equipment) VBE equipment is completely independent and separated.

[0073] Embodiment 4:

[0074] like Figure 5 As shown, the present invention also provides an electronic device, which may be a computer device, a single-chip device, an intelligent mobile device, etc. The electronic device in this embodiment may include a processor, a memory, a transceiver component, etc. The memory, the processor, and the transceiver component are connected via a bus; the memory may be used to store an execution program, and an exemplary execution program may include instructions; the processor is used to execute the instructions stored in the memory. The memory may also be used to store data, which may be called and / or modified when the instructions are executed.

[0075] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. It is the computing core and control core of the terminal, which is suitable for implementing one or more instructions, specifically suitable for loading and executing one or more instructions in a storage medium to implement a corresponding method flow or corresponding function, so as to implement the steps of a discrete system real-time following method based on serial communication in the above-mentioned embodiment.

[0076] Embodiment 5:

[0077] Based on the same inventive concept, the present invention also provides a readable storage medium, specifically an electronic device readable storage medium (Memory), which is a memory device in the electronic device for storing programs and data. It can be understood that the storage medium here can include both the built-in storage medium in the electronic device and the extended storage medium supported by the electronic device. The storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space, and these instructions can be one or more execution programs (including program codes). It should be noted that the storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor loads and executes one or more instructions stored in the storage medium, which can implement the steps of a discrete system real-time following method based on serial communication in the above embodiment.

[0078] Those skilled in the art will appreciate that the embodiments of the present invention application can be provided as methods, systems, or computer program products. Therefore, the present invention application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present invention application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0079] The present invention application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present invention application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0080] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0081] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0082] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention application rather than to limit its protection scope. Although the present invention application is described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that after reading the present invention application, those skilled in the art can still make various changes, modifications or equivalent substitutions to the specific implementation methods of the application, but these changes, modifications or equivalent substitutions are all within the protection scope of the claims to be approved.

Claims

1. A discrete system real-time following system based on serial communication, characterized in that: The system comprises: a first valve control subsystem and a second valve control subsystem; the first valve control subsystem comprises a first logic processing unit and a first encoding and decoding unit; the second valve control subsystem comprises a second logic processing unit and a second encoding and decoding unit; The first logic processing unit is connected to an external flow conversion valve through the first codec unit; the second logic processing unit is connected to the external flow conversion valve through the second codec unit; The first logic processing unit and the second logic processing unit use serial communication to realize the master-slave state of the first valve control subsystem and the second valve control subsystem.

2. The system according to claim 1, characterized in that A high-speed serial communication protocol and field programmable gate array parallel processing technology are used between the first logic processing unit and the second logic processing unit to form a serial transmission link.

3. The system according to claim 2, characterized in that A high-speed serial communication protocol is implemented between the first logic processing unit and the second logic processing unit using optical fiber.

4. The system according to claim 1, characterized in that The first valve control subsystem and the second valve control subsystem are powered by independent power supplies respectively.

5. The system according to any one of claims 1 to 3, characterized in that: The first logic processing unit and the second logic processing unit realize the master-slave state of the first valve control subsystem and the second valve control subsystem by exchanging the master-slave signal state and the channel state of the first valve control subsystem and the second valve control subsystem.

6. The system according to claim 5, characterized in that The converter valve comprises: a thyristor trigger monitoring module and a thyristor; The thyristor is connected to the thyristor trigger monitoring module for communication; the first logic processing unit and the second logic processing unit are connected to the thyristor trigger monitoring module for communication and interaction respectively; The thyristor is used to receive a trigger command from the thyristor trigger monitoring module, and is triggered according to the trigger command to realize the conduction of the converter valve.

7. The system according to claim 6, characterized in that The first valve control subsystem further includes: a first electro-optical conversion module; the first electro-optical conversion module is respectively connected to the first encoding and decoding unit and the thyristor trigger monitoring module for communication; The second valve control subsystem further includes: a second electro-optical conversion module; the second electro-optical conversion module is communicatively connected with the second encoding and decoding unit and the thyristor trigger monitoring module respectively.

8. The system according to claim 7, characterized in that The first electro-optical conversion module includes a first electro-optical conversion transmitting board and a first electro-optical conversion receiving board; the second electro-optical conversion module includes a second electro-optical conversion transmitting board and a second electro-optical conversion receiving board; The first electro-optical conversion transmitting board is used to receive the signal of the first encoding and decoding unit, and transmit the signal to the thyristor trigger monitoring module after conversion; the first electro-optical conversion receiving board is used to receive the signal of the thyristor trigger monitoring module, and transmit the signal to the first encoding and decoding unit after conversion; The second electro-optical conversion transmitting board is used to receive the signal of the thyristor trigger monitoring module, and send the converted signal to the second encoding and decoding unit; the second electro-optical conversion receiving board is used to receive the signal of the thyristor trigger monitoring module, and send the converted signal to the second encoding and decoding unit.

9. The system according to any one of claims 1 to 8, characterized in that: The system further includes: a control and protection module, the control and protection module being communicatively connected with the converter valve; The control and protection module is used to issue an alarm message when the converter valve is abnormal; the alarm message includes a signal reminder message of insufficient redundancy of the thyristors in the converter valve.

10. A discrete system real-time following method based on serial communication, characterized in that: The method is applicable to the system according to any one of claims 1 to 9, and the method comprises: Serial communication is adopted between the first logic processing unit in the first valve control subsystem and the second logic processing unit in the second valve control subsystem to realize the master-slave state of the first valve control subsystem and the second valve control subsystem.

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