Extra-high voltage thyristor converter valve temperature monitoring device arrangement and monitoring method

Abstract

The invention provides an extra-high voltage thyristor converter valve temperature monitoring device comprising a plurality of temperature sensors which are respectively connected to the surface of a thyristor press-fitting unit; the optical fibers comprise a plurality of branch optical fibers and a gathering optical fiber, the plurality of branch optical fibers are arranged in parallel, one ends of the plurality of branch optical fibers are respectively connected with the plurality of temperature sensors, and the other ends of the plurality of branch optical fibers are jointly connected to the optical fiber box; the plurality of branch optical fibers are gathered into one gathered optical fiber through the optical fiber box and are connected to a control room; the temperature sensor is connected to the surface of the thyristor press-fitting unit, zero-intrusive sensor arrangement does not interfere with the structure and operation of an original system, interference of newly added electromagnetic waves is avoided, interference of high-voltage and strong electromagnetic environments on the performance of the sensor is effectively avoided through optical fiber transmission, and high precision and stability of data are ensured.

Description

Technical Field

[0001] The present invention relates to the technical field of monitoring power devices in converter valve equipment of ultra-high voltage direct current (UHVDC) power transmission projects, and in particular to an arrangement and a monitoring method for a temperature monitoring device of an ultra-high voltage thyristor converter valve. Background Art

[0002] Ultra-high voltage direct current (UHVDC) transmission projects offer significant advantages in long distances, large capacity, and low losses, making them a crucial technological solution for the interregional transmission of clean energy and the optimal allocation of energy resources. However, the operational reliability of these core components is directly linked to the safety and stability of the power system. In UHVDC systems, the converter valves are key components, and the performance of their thyristor devices plays a crucial role in system reliability. Research has shown that approximately 55% of high-power chip failures are caused by temperature, with junction temperature fluctuations in power devices being one of the primary causes of thyristor thermal failure. Thyristor thermal failure not only damages the equipment but can also cause the converter valve to shut down, seriously threatening the stable operation of the power grid and significantly impacting electricity consumption and industrial production.

[0003] Currently, safety research on high-power chips still focuses primarily on fault diagnosis, lacking real-time, precise control technologies. This is particularly true in complex UHVDC projects, where thyristors are constantly exposed to extreme environments of high current, high voltage, and strong electromagnetic interference. Traditional monitoring technologies struggle to meet these demands. Therefore, there is an urgent need to develop high-precision temperature sensing technology that can adapt to harsh electromagnetic environments. By enabling real-time monitoring and assessment of key temperature parameters of thyristors and their converter valve systems, this technology can provide the technical support for accurately identifying weak links and improving reliability. This research direction is crucial for improving the overall reliability and stability of UHVDC transmission projects. Summary of the Invention

[0004] In order to solve the problems of the prior art thyristor commutator valve power device temperature monitoring technology, the present invention proposes a UHV thyristor commutator valve temperature monitoring device, comprising:

[0005] There are several temperature sensors, each of which is connected to the surface of the thyristor press-fit unit;

[0006] The optical fiber includes a branch optical fiber and an aggregation optical fiber. There are several branch optical fibers, and the several branch optical fibers are arranged in parallel with each other. One end of the several branch optical fibers is respectively connected to the several temperature sensors, and the other ends of the several branch optical fibers are commonly connected to the optical fiber box. The several branch optical fibers are aggregated into an aggregation optical fiber through the optical fiber box and connected to the control room.

[0007] Preferably, it also includes a handheld mounting fixture (8);

[0008] The temperature sensor is adhered to the thyristor press-fit unit by a handheld mounting fixture.

[0009] Preferably, the handheld mounting fixture comprises: a clamping plate, one end of the clamping plate is provided with a U-shaped recess corresponding to the thyristor press-fitting unit, and the other end of the clamping plate is provided with a square through hole for handholding.

[0010] Preferably, a buffer insulation pad is provided at the connection between the handheld installation fixture and the thyristor press-fitting unit.

[0011] Preferably, the thyristor press-fitting unit comprises: a plurality of thyristors and a plurality of heat sinks;

[0012] The plurality of thyristors are arranged at intervals, and the plurality of heat sinks are arranged in the gaps between the plurality of thyristors;

[0013] The temperature sensor is connected to the thyristor.

[0014] Preferably, the attachment position of the temperature sensor is determined according to actual conditions of different working conditions, including: attaching to any point on the cathode disk of the thyristor or the anode ceramic cylindrical surface, or attaching to various positions of the radiator.

[0015] On the other hand, the present invention also provides an arrangement of a UHV thyristor converter valve temperature monitoring device, comprising: a converter valve and the UHV thyristor converter valve temperature monitoring device described in any one of the above items, wherein the UHV thyristor converter valve temperature monitoring device is respectively arranged on the first and last valve sections of the converter valve.

[0016] In another aspect, the present invention further provides a UHV thyristor converter valve temperature monitoring system, characterized by comprising: an arrangement and a control chamber of the UHV thyristor converter valve temperature monitoring device as described above;

[0017] The control room is used to receive temperature information and analyze the temperature information.

[0018] In another aspect, the present invention further provides a method for monitoring the temperature of an ultra-high voltage thyristor converter valve, characterized by using the ultra-high voltage thyristor converter valve temperature monitoring device as described in any one of the above items, comprising:

[0019] The temperature in the thyristor press unit is measured by several temperature sensors, and the temperature of the first and last valve sections of the converter valve are monitored online in real time.

[0020] transmitting the temperature information measured by the temperature sensors to the optical fiber box through the branch optical fibers;

[0021] The optical fiber box aggregates a plurality of branch optical fibers into an aggregate optical fiber, and transmits the acquired temperature information to a control room, which analyzes the temperature information, thereby realizing real-time temperature monitoring.

[0022] Preferably, the control room analyzes the temperature information to achieve real-time temperature monitoring, including:

[0023] The control room central control system performs spectrum analysis on the optical signal transmitted by the optical fiber and analyzes the temperature of each monitoring point, thereby realizing real-time online monitoring of the thyristor temperature.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] The present invention provides a temperature monitoring device for an ultra-high voltage thyristor converter valve, comprising: a plurality of temperature sensors, each connected to the surface of a thyristor press-fit unit; and optical fibers, including branch optical fibers and a converging optical fiber. The branch optical fibers are provided in parallel, one end of each branch optical fiber being connected to a plurality of temperature sensors, and the other ends of each branch optical fiber being connected to a fiber optic box. The fiber optic box aggregates the branch optical fibers into a converging optical fiber and connects the converging optical fiber to a control room. The temperature sensors are connected to the surface of the thyristor press-fit unit using a non-invasive temperature sensor arrangement. This arrangement does not interfere with the structure and operation of the original system, does not require an independent power supply, does not interfere with the original system, and does not generate additional electromagnetic interference, thus avoiding new electromagnetic interference. This achieves seamless compatibility with the original system and facilitates the construction of a large-scale sensor network. Compared to the limitation of traditional electrical sensors that rely on two wires for connection, this solution greatly simplifies the wiring requirements of the sensor network, facilitating large-scale deployment. The branch optical fibers are aggregated into an aggregate optical fiber through an optical fiber box and data is transmitted to the control room, realizing a flexible topology structure of series connection of a single branch optical fiber and multiple temperature sensors and parallel connection of multiple branch optical fibers, supporting the efficient construction of large-scale temperature monitoring arrays; the data transmission of the optical fiber is optical signal data transmission, which can effectively avoid interference of high voltage and strong electromagnetic environment on sensor performance, ensuring high precision and stability of data transmission. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a planar layout diagram of a single valve section device and sensor of the present invention;

[0027] Figure 2 This is a schematic diagram of the arrangement structure of a single valve section sensor of the present invention;

[0028] Figure 3 This is a schematic diagram of the installation of the thyristor-level temperature sensor of the present invention;

[0029] Figure 4 Schematic diagram of the DWDM structure of the present invention;

[0030] Figure 5 This is a schematic structural diagram of a thyristor press-fit unit according to the present invention;

[0031] Figure 6 Schematic diagram of the system topology of the present invention;

[0032] Figure 7 Schematic diagram of the process of the temperature monitoring method of the ultra-high voltage thyristor converter valve of the present invention;

[0033] Figure 8 A schematic diagram of the topological structure of a single valve section sensor of the present invention;

[0034] Among them, 1-thyristor press-fit unit, 2-board unit, 3-fiber optic box, 4-optical fiber, 5-temperature sensor, 6-thyristor, 7-heat sink, 8-handheld installation fixture, 9-DWDM, 10-DWDM output end, 11-DWDM input end, 12-mounting bolts. DETAILED DESCRIPTION

[0035] Example 1:

[0036] A temperature monitoring device for a UHV thyristor valve, such as Figure 1 and Figure 2 Shown: Includes:

[0037] There are several temperature sensors 5, each of which is connected to the surface of the thyristor press-fit unit 1;

[0038] The optical fiber 4 includes branch optical fibers and aggregation optical fibers. Several branch optical fibers are provided and one end of each of the branch optical fibers is connected to the temperature sensor 5. The other end of the branch optical fiber is connected to the optical fiber box 3. The optical fiber box 3 aggregates the several branch optical fibers into an aggregation optical fiber and connects it to the control room.

[0039] The temperature sensor 5 is connected to the surface of the thyristor press-fit unit 1, and adopts a zero-invasive temperature sensor 5 arrangement method using photonic chip sensing technology. It does not interfere with the original system structure and operation, does not require an independent power supply, does not intervene in the original system, does not generate additional electromagnetic wave interference, avoids new electromagnetic wave interference, and achieves seamless compatibility with the original system and the construction of a large-scale sensor network. Compared with the limitation that traditional electrical sensors need to rely on two wires for connection, this solution greatly simplifies the wiring requirements of the sensor network and facilitates large-scale deployment.

[0040] The branch optical fibers are aggregated into an aggregate optical fiber through the optical fiber box 3 and data is transmitted to the control room, realizing a flexible topological structure of series connection of a single branch optical fiber and multiple temperature sensors 5 and parallel connection of multiple branch optical fibers, supporting the efficient construction of large-scale temperature monitoring arrays, and can use one aggregate optical fiber for one valve section to monitor the real-time temperature of at least 20 points, greatly simplifying the network structure, and at the same time realizing the independence of the optical paths of each sensor, which is convenient for later inspection and maintenance; the data transmission of the optical fiber 4 is optical signal data transmission, which can effectively avoid the interference of high voltage and strong electromagnetic environment on sensor performance, and ensure high precision and stability of data transmission.

[0041] Simplified installation and maintenance by reusing existing resources: The sensor network is laid out using spare fiber resources in the original system, and the DWDM 9 equipment is deployed in the existing fiber storage area, significantly reducing the investment in new resources and the complexity of installation and construction, while facilitating future maintenance and expansion.

[0042] like Figure 3 As shown, a handheld mounting fixture (8) is also included;

[0043] The temperature sensor 5 is adhered to the thyristor press-fit unit 1 by a handheld mounting fixture 8 .

[0044] The temperature sensor 5 is attached to the thyristor 6 or the radiator 7 whose temperature needs to be measured; the temperature sensor 5 can be attached in various ways, such as by bonding with thermally conductive silicone, fixing clamps, etc., or it can be directly embedded in the thyristor 6 and the radiator 7.

[0045] The temperature sensor 5 can be flexibly installed in various ways, such as by gluing, clamping, or embedding within the device, to meet different application requirements. Furthermore, the temperature sensor 5 can be placed above, below, left, right, and around the power device to achieve all-round temperature monitoring, ensuring accurate temperature data collection in key areas and providing reliable support for comprehensive assessment of the device's operating status.

[0046] Preferably, the handheld mounting fixture 8 comprises: a clamping plate, one end of which is provided with a U-shaped recess corresponding to the thyristor press-fitting unit 1 , and the other end of which is provided with a square through hole for handholding.

[0047] Preferably, a buffer insulation pad is provided at the connection between the handheld installation fixture 8 and the thyristor press-fitting unit 1 .

[0048] The handheld mounting fixture 8 is used to fix the optical fiber 4 with the temperature sensor 5 on the thyristor 6. A buffer insulation pad is set at the contact part between the handheld mounting fixture 8 and the device for buffering to avoid hard contact damaging the photonic chip sensor. After the temperature sensor 5 is installed in place, the handheld mounting fixture 8 is removed.

[0049] like Figure 4 As shown, the optical fiber box 3 is provided with a DWDM 9;

[0050] The DWDM output end 10 is connected to the control room via one of the aggregation optical fibers;

[0051] The DWDM input end 11 is connected to the temperature sensors 5 through a plurality of branch optical fibers.

[0052] The DWDM 9 can be arranged in the fiber optic box 3 for connection and fixation by installing bolts 12 or customizing fixing connectors and other structural forms.

[0053] The output end 10 of the DWDM 9 is connected to a spare optical fiber of the fundamental valve section, i.e., the aggregation optical fiber, and the input end 11 and the branch optical fiber are connected to the temperature sensor 5; wherein the temperature sensor 5 is a sensor based on a silicon photonic sensing chip, which is integrated in the pigtail part of the branch optical fiber.

[0054] The temperature sensor 5 uses single-mode or multi-mode optical fiber and accurately prepares the microstructure through femtosecond laser etching technology. The overall length is 3mm, and the pigtail part adopts a polyimide coating design to ensure that it has high sensitivity, miniaturization characteristics and excellent environmental adaptability, and can meet the precision detection needs in complex environments.

[0055] Preferably, the interface types of the DWDM output end 10 and the DWDM input end 11 are determined according to actual conditions of different working conditions, including: ST / UPC interface, LC / APC interface.

[0056] The DWDM 9 and the fiber optic box 3 are mounted together on the support frame of the board unit 2 by connecting the mounting bolts 12 . The thyristor mounting unit 1 is mounted on the support frame and is located on one side of the board unit 2 .

[0057] like Figure 5 As shown, the thyristor press-fit unit 1 includes: a plurality of thyristors 6 and a plurality of heat sinks 7;

[0058] The plurality of thyristors 6 are arranged at intervals, and the plurality of heat sinks 7 are arranged in the gaps between the plurality of thyristors 6;

[0059] The temperature sensor 5 is connected to the thyristor 6 .

[0060] The thyristor press-fit unit 1 is composed of a plurality of thyristors 6, a plurality of heat sinks 7, and a support frame. The number of thyristors 6 and heat sinks 7 varies depending on the number of series-connected converter valves.

[0061] The temperature sensor 5 is attached to the thyristor 6 or the heat sink 7 whose temperature needs to be measured.

[0062] Preferably, the attachment position of the temperature sensor 5 is determined according to the actual conditions of different working conditions, including: attaching to any point on the thyristor cathode disk or anode ceramic cylindrical surface, or attaching to various positions of the radiator 7.

[0063] Real-time, high-precision temperature monitoring capability: Build a real-time temperature monitoring network covering thyristor core power devices to accurately capture changes in junction temperature of key equipment, providing strong support for equipment operating status assessment, fault warning, and reliability optimization.

[0064] Example 2:

[0065] Based on the same inventive concept, the present invention also provides an arrangement of a temperature monitoring device for an ultra-high voltage thyristor converter valve, which is characterized in that it includes: a converter valve and the ultra-high voltage thyristor converter valve temperature monitoring device as described above, and the ultra-high voltage thyristor converter valve temperature monitoring device is respectively arranged on the first and last valve sections of the converter valve.

[0066] The converter valve is the core equipment of the high-voltage direct current (HVDC) transmission system, responsible for converting alternating current (AC) to direct current (DC), ensuring the efficiency and stability of power transmission. The single valve is the basic unit of the converter valve, usually composed of multiple thyristor components connected in series or parallel to form a complete commutation path. The valve section is a further subdivision of the single valve, usually composed of multiple thyristor modules, used for hierarchical control and voltage sharing protection.

[0067] like Figure 6 In the system topology shown, for UHVDC projects, a single valve hall typically contains a set of 12-pulse converters, consisting of 12 individual valves arranged into three or six converter valve towers. Each individual valve consists of several valve sections connected in series. To monitor the temperature of the converter valve power components, a DWDM 9 device is installed at the first and last valve sections of each individual valve. Depending on the number of thyristor 6 stages in each valve section, a single optical fiber within that valve section can be used to monitor a varying number of points. A single valve hall contains 12 individual valves, for a total of 24 DWDM 9 channels. All sensored valve sections transmit signals to the control room via a single backup optical fiber. The central control system in the control room performs spectral analysis and interprets the individual module temperatures, enabling real-time online monitoring of the thyristor 1 temperature in each valve section.

[0068] Example 3:

[0069] Based on the same inventive concept, the present invention also provides a UHV thyristor converter valve temperature monitoring system, characterized by comprising: an arrangement and a control room of the UHV thyristor converter valve temperature monitoring device according to claim 8;

[0070] The control room is used to receive temperature information and analyze the temperature information.

[0071] Example 4:

[0072] Based on the same inventive concept, the present invention also provides a temperature monitoring method for a UHV thyristor converter valve, such as Figure 7 As shown, a temperature monitoring device for a UHV thyristor converter valve as described in any one of the above items is used, comprising:

[0073] The temperature in the thyristor press unit 1 is measured by a number of temperature sensors 5, and the temperature of the first and last valve sections of the converter valve is monitored online in real time;

[0074] The temperature information measured by the temperature sensors 5 is transmitted to the optical fiber box 3 through a plurality of branch optical fibers;

[0075] The optical fiber box 3 aggregates the plurality of branch optical fibers into one aggregate optical fiber, and transmits the acquired temperature information to the control room, which analyzes the temperature information, thereby achieving real-time temperature monitoring.

[0076] Preferably, the control room analyzes the temperature information to achieve real-time temperature monitoring, including:

[0077] The central control system in the control room performs spectrum analysis on the optical signal transmitted by the optical fiber and analyzes the temperature of each monitoring point, thereby realizing real-time online monitoring of the temperature of the thyristor 6 .

[0078] Example 5:

[0079] This paper designs a sensor network topology and optimized layout suitable for practical engineering applications. This system provides a temperature monitoring system. By using a series-connected structure of specific wavelength wave plates, it implements dense wavelength division multiplexing and demultiplexing of optical paths, significantly reducing optical path losses. This system can monitor the real-time temperature of at least 20 points per valve section using a single optical fiber, significantly simplifying the network structure. Furthermore, each sensor optical path is independent, facilitating subsequent inspection and maintenance.

[0080] like Figure 8 The sensor topology of a single valve section is shown. For the sensor arrangement of a single valve section, one sensor is installed on each thyristor stage for temperature monitoring. The sensor can be installed on the corresponding thyristor tube shell or on the surface of the heat sink 7 in contact with it. Each valve section can monitor up to 20 points, which are summarized by the DWDM 9 and output using one optical fiber. The DWDM 9 is placed in the spare optical fiber box 4 of the corresponding valve section, and the interface between the optical fiber 4 and the DWDM 9 is located inside the optical fiber box 4.

[0081] By rationally installing the sensor system and laying the optical path network in the converter valve hall, a large-scale temperature monitoring network with wide coverage and high perception accuracy is constructed, which enables real-time and accurate monitoring of the junction temperature of the core power devices of the thyristor converter valve. This meets the operation requirements in complex electromagnetic environments, effectively improves the reliability of temperature monitoring and system stability, and provides important technical support for the safe operation and fault warning of UHVDC projects.

[0082] It will be understood by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Thus, the present invention may take the form of an entirely hardware embodiment, an entirely software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0083] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowcharts and / or block diagrams, as well as combinations of processes and / or blocks in the flowcharts and / or block diagrams, 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 produce 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 flowcharts and / or block diagrams. 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.

[0084] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work 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 The function specified in one or more boxes.

[0085] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0086] The above are merely embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention are included in the scope of the claims of the present invention to be approved.

Claims

1. A temperature monitoring device for a UHV thyristor valve, characterized in that: include: A plurality of temperature sensors (5) are provided and are respectively connected to the surface of the thyristor press-fit unit (1); The optical fiber (4) includes a branch optical fiber and a gathering optical fiber. The branch optical fibers are provided in plurality, and the plurality of branch optical fibers are arranged in parallel with each other. One end of each of the branch optical fibers is connected to a plurality of the temperature sensors (5), respectively. The other ends of the plurality of branch optical fibers are connected to a fiber optic box (3) in common. The plurality of branch optical fibers are gathered into a gathering optical fiber through the fiber optic box (3) and connected to a control room.

2. A temperature monitoring device for a UHV thyristor valve according to claim 1, characterized in that: Also included is a handheld mounting fixture (8); The temperature sensor (5) is adhered to the thyristor press-fit unit (1) via a handheld mounting fixture (8).

3. The temperature monitoring device for a UHV thyristor valve according to claim 2, characterized in that: The handheld mounting fixture (8) comprises a clamping plate, one end of which is provided with a U-shaped recess corresponding to the thyristor press-fitting unit (1), and the other end of which is provided with a square through hole for handholding.

4. The temperature monitoring device for a UHV thyristor valve according to claim 3, characterized in that: A buffer insulation pad is provided at the connection between the handheld installation fixture (8) and the thyristor pressing unit (1).

5. The temperature monitoring device for a UHV thyristor valve according to claim 1, wherein: The thyristor press-fitting unit (1) comprises: a plurality of thyristors (6) and a plurality of heat sinks (7); The plurality of thyristors (6) are arranged at intervals, and the plurality of heat sinks (7) are arranged in the gaps between the plurality of thyristors (6); The temperature sensor (5) is connected to the thyristor (6).

6. The temperature monitoring device for a UHV thyristor valve according to claim 5, characterized in that: The attachment position of the temperature sensor (5) is determined according to actual conditions of different working conditions, including: attachment to any point on the thyristor cathode disk or anode ceramic cylindrical surface, or attachment to various positions of the radiator (7).

7. An arrangement of a temperature monitoring device for a UHV thyristor converter valve, characterized in that: include: A converter valve and a temperature monitoring device for an ultra-high voltage thyristor converter valve according to any one of claims 1 to 6, wherein the temperature monitoring device for the ultra-high voltage thyristor converter valve is respectively arranged on the first and last valve sections of the converter valve.

8. A temperature monitoring system for ultra-high voltage thyristor converter valves, characterized in that: include: The arrangement and control room of a temperature monitoring device for a UHV thyristor converter valve according to claim 7; The control room is used to receive temperature information and analyze the temperature information.

9. A method for monitoring the temperature of a UHV thyristor converter valve, characterized in that: A temperature monitoring device for a UHV thyristor valve according to any one of claims 1 to 6 is used, comprising: The temperature in the thyristor press-fit unit (1) is measured by a plurality of temperature sensors (5), and the temperature of the first and last valve sections of the converter valve are monitored online in real time; transmitting temperature information measured by a plurality of temperature sensors (5) through a plurality of branch optical fibers; The optical fiber box (3) aggregates a plurality of branch optical fibers into an aggregate optical fiber, and transmits temperature information acquired by the temperature sensor (5) to a control room, which analyzes the temperature information, thereby achieving real-time temperature monitoring.

10. The method for monitoring temperature of a UHV thyristor valve according to claim 9, wherein: The control room analyzes the temperature information to achieve real-time temperature monitoring, including: The control room central control system performs spectrum analysis on the optical signal transmitted by the aggregated optical fiber and analyzes the temperature of each monitoring point, thereby achieving real-time online monitoring of the thyristor (6) temperature.

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