Converter valve state monitoring sensor and composite power supply device and power supply method thereof

Abstract

The invention discloses a converter valve state monitoring sensor and a composite power supply device and a power supply method thereof, and belongs to the technical field of direct current transmission. The composite power supply device comprises a temperature difference energy taking module, a power supply management module and a space magnetic field energy taking module; the temperature difference energy taking module is deployed at a heating part of a converter valve, collects temperature difference energy of the converter valve and outputs direct current to the power supply management module; the space magnetic field energy taking module comprises a plurality of layers of planar coils, collects converter valve space broadband magnetic field energy and outputs alternating current to the power supply management module; the power supply management module is used for electric energy collection and charge and discharge management, and supplies power to the state monitoring sensor. Through efficient coupling of the converter valve temperature difference energy taking module and the space broadband magnetic field energy taking module, the environment energy collecting efficiency of the converter valve is improved, and therefore the continuity and stability of energy supply of the converter valve monitoring sensor are guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of direct current transmission, and more specifically, relates to a converter valve state monitoring sensor and a composite power supply device and a power supply method thereof. Background Art

[0002] As the core equipment of DC transmission technology, converter valves are expensive, and their safe and stable operation is of great significance to ensuring national energy security. Although there are some embedded converter valve status monitoring sensor solutions at this stage, the continuous and stable power supply of sensors is still an urgent problem to be solved in the current converter valve status monitoring field.

[0003] At present, condition monitoring sensors are usually powered by lithium batteries. However, when the lithium batteries are exhausted, the converter valve needs to be shut down to replace the lithium batteries, which incurs huge manpower and material costs. In addition, the reliability of lithium batteries in the strong electromagnetic environment of the converter valve has yet to be verified. Using thyristor-level RC buffer circuits to provide power to sensors can achieve continuous energy supply, but this will change the original structural design of the converter valve system. The electrical parameters of the main circuit need to be recalibrated, which is a huge workload and poses certain risks to the safe and stable operation of the converter valve.

[0004] At present, some relevant institutions have carried out research on sensor self-powered technology for energy collection during the operation of converter valves, including temperature difference energy collection and magnetic field energy collection, but there are still problems in the stability and sustainability of energy supply. Temperature difference energy collection is subject to the performance of thermoelectric materials, and the energy output efficiency is generally low. The power supply capacity of the converter valve status monitoring sensor needs to be improved; the power frequency magnetic field energy collection device can generally only be installed on the surface of the converter valve busbar or in a position with a large power frequency magnetic field strength around it, and it has strong directionality and high installation requirements.

[0005] Prior art document 1 (CN115371840A) proposes a temperature monitoring sensor for the joint of an electric power equipment and a magnetic field temperature difference energy acquisition method thereof to realize power supply to the electric temperature sensor. However, its magnetic field energy acquisition part is mainly for invasive industrial frequency magnetic field energy acquisition, and its non-invasive broadband magnetic field energy acquisition capability in narrow spaces such as inside a converter valve is insufficient.

[0006] Prior art document 2 (CN113567007A) discloses a converter valve temperature monitoring sensor, which is installed on the surface of the converter valve heat sink. The converter valve temperature monitoring sensor includes: a power supply unit and a sensor unit, wherein the sensor unit is used to collect the operating temperature of the converter valve and send the operating temperature to the background host computer; the power supply unit is used to power the sensor unit by temperature difference energy extraction and / or magnetic field energy extraction. The installation and deployment position of the converter valve temperature monitoring sensor provided in the prior art focuses on the converter valve heat sink, and the application scope is relatively small. Summary of the invention

[0007] In order to address the deficiencies in the prior art, the present invention provides a composite power supply device and method for a converter valve state monitoring sensor. Aiming at the abundant temperature difference and broadband electromagnetic field energy generated during the operation of the converter valve, the device couples the high-efficiency temperature difference energy harvesting technology with the spatial broadband magnetic field energy harvesting technology, thereby increasing the energy source of the power management circuit, improving the continuity and stability of the sensor power supply, expanding the frequency range and spatial range of magnetic field energy collection, and broadening the business scope of converter valve state monitoring.

[0008] The present invention adopts the following technical solution.

[0009] A first aspect of the present invention provides a converter valve state monitoring sensor composite power supply device,

[0010] The device includes a temperature difference energy acquisition module, a power management module and a space magnetic field energy acquisition module, wherein:

[0011] The temperature difference energy acquisition module and the space magnetic field energy acquisition module are respectively connected to the power management module;

[0012] The temperature difference energy acquisition module is deployed at the heating point of the converter valve, collects the temperature difference energy of the converter valve and outputs direct current to the power management module; the space magnetic field energy acquisition module includes a multi-layer planar coil, collects the spatial broadband magnetic field energy of the converter valve and outputs alternating current to the power management module; the power management module is used for electric energy collection and charge and discharge management, and supplies power to the status monitoring sensor.

[0013] Optionally, the temperature difference energy harvesting module includes: a Cu thermal collector plate, a temperature difference power generation array and a fin heat sink; the Cu thermal collector plate and the fin heat sink are respectively connected to the temperature difference power generation array; the Cu thermal collector plate is deployed at the heating position of the converter valve, the hot end of the temperature difference power generation array is in contact with the heat source of the converter valve through the Cu thermal collector plate, and the cold end of the temperature difference power generation array exchanges heat with the air through the fin heat sink, thereby generating a temperature difference environment, and the temperature difference power generation array generates DC power and outputs it to the power management module.

[0014] Optionally, the space magnetic field energy harvesting module includes an I-shaped magnetic core, a multi-layer planar coil and a flexible substrate; the multi-layer planar coil of the space magnetic field energy harvesting module is arranged on a flexible substrate with a central opening, the I-shaped magnetic core passes through the middle opening part of the flexible substrate, and the multi-layer planar coil generates AC power and outputs it to the power management module.

[0015] Optionally, the power management module includes a magnetic field energy power tracking unit, a temperature difference energy power tracking unit, a rectifier unit, an energy storage unit, a discharge control unit and a DC / DC conversion unit; the magnetic field energy power tracking unit is connected to the rectifier unit, and the rectifier unit is connected to the energy storage unit; the temperature difference energy power tracking unit is directly connected to the energy storage unit; the energy storage unit is connected to the discharge control unit, and the discharge control unit is connected to the DC / DC conversion unit; the magnetic field energy power tracking unit is used to process the AC output of the space magnetic field energy acquisition module, and the AC is rectified and transformed by the rectifier unit and then input into the energy storage unit in the form of DC; the temperature difference energy power tracking unit is used to process the DC output of the temperature difference energy acquisition module and input into the energy storage unit in the form of DC; the discharge control unit is used to control the discharge, and the DC-DC conversion unit changes the voltage output by the discharge control unit.

[0016] The second aspect of the present invention provides a converter valve state monitoring sensor, which is connected to the converter valve state monitoring sensor composite power supply device described in the first aspect of the present invention, and the state monitoring sensor includes a power interface, a control unit, a state sensing unit, an A / D conversion unit and a wireless communication unit; the power interface is connected to the output interface of the power management module, and the composite power supply device supplies power to the state monitoring sensor; the state sensing unit, the A / D conversion unit and the wireless communication unit are respectively connected to the control unit, the state sensing unit is connected to the A / D conversion unit, and the A / D conversion unit is connected to the wireless communication unit; the control unit controls the operation of each unit of the state monitoring sensor, the state sensing unit converts the temperature signal into an analog electrical signal, the A / D conversion unit is used to convert the analog signal into a digital signal, and the wireless communication unit is used to wirelessly send the converter valve state data information to the monitoring main station.

[0017] A third aspect of the present invention provides a composite power supply method for a converter valve state monitoring sensor, which is applied to the composite power supply device for the converter valve state monitoring sensor. The method comprises:

[0018] The temperature difference energy of the converter valve is collected at the heating point of the converter valve and converted into direct current output, and the spatial broadband magnetic field energy of the converter valve is collected at any position of the converter valve and converted into alternating current output;

[0019] The DC output and AC output are rectified and transformed accordingly, so that the electric energy is input into the energy management unit in the form of DC power, and then the state monitoring sensor is powered.

[0020] Optionally, collecting the converter valve temperature difference energy and converting it into electrical energy specifically includes:

[0021] The Cu thermal collector of the temperature difference energy harvesting module is deployed at the heating position of the converter valve, so that the hot end of the temperature difference power generation array contacts the heat source of the converter valve through the Cu thermal collector, and the cold end of the temperature difference power generation array exchanges heat with the air through the fin heat sink, generating a temperature difference environment, and then generating DC power output.

[0022] Optionally, the collecting of the converter valve spatial broadband magnetic field energy and converting it into electrical energy specifically includes:

[0023] The spatial magnetic field energy acquisition module collects the wide-band magnetic field energy of the converter valve and converts it into electrical energy;

[0024] The multi-layer planar coils of the space magnetic field energy harvesting module are arranged on a flexible substrate with a central opening, and the I-shaped magnetic core passes through the middle opening of the flexible substrate;

[0025] The multi-layer planar coil collects the spatial magnetic field energy of the converter valve and generates AC power output.

[0026] Optionally, the method further includes:

[0027] When collecting temperature difference energy and spatial broadband magnetic field energy and converting them into electrical energy output, the power tracking algorithm is used to optimize its output power.

[0028] Optionally, the specifications of the multi-layer planar coils are inconsistent, and their specifications are differentially matched according to different spatial magnetic field frequency intervals of the converter valve.

[0029] Compared with the prior art, the beneficial effects of the present invention include at least:

[0030] 1. Through the efficient coupling of the converter valve temperature difference energy harvesting module and the space magnetic field energy harvesting module, the efficiency of the converter valve environmental energy harvesting is improved, thereby ensuring the continuity and stability of the energy supply of the converter valve monitoring sensor;

[0031] 2. The spatial broadband magnetic field energy harvesting module collects the abundant broadband magnetic field energy in the converter valve environment through a multi-layer planar coil design, so that the magnetic field energy collection is no longer limited to the power frequency magnetic field near the busbar, expanding the scope of sensing applications and the types of converter valve status monitoring services;

[0032] 3. The present invention expands the application scope of the temperature difference energy harvesting device and the magnetic field energy harvesting device. In addition to being deployed on the heat sink of the converter valve, it can also be deployed at the converter valve reactor, busbar and other places with heat or rich spatial magnetic field;

[0033] 4. The energy acquisition device designed in the present invention is an integrated composite power supply device, which improves the flexibility of deployment through miniaturization design. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0035] Figure 1 A structural diagram of the device provided in an embodiment of the present invention;

[0036] Figure 2 A structural diagram of a temperature difference energy extraction module provided in an embodiment of the present invention;

[0037] Figure 3 A structural diagram of a space magnetic field energy harvesting module provided by an embodiment of the present invention;

[0038] Figure 4 A structural diagram of an I-shaped magnetic core provided by an embodiment of the present invention;

[0039] Figure 5 A physical schematic diagram of a space magnetic field energy harvesting module provided by an embodiment of the present invention;

[0040] Figure 6 A structural diagram of a power management circuit provided by an embodiment of the present invention;

[0041] Figure 7 A structural diagram of a state monitoring sensor provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0042] In order to make the purpose, technical scheme and advantages of the present invention clearer, the technical scheme of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The described embodiments are only embodiments of a part of the present invention, not all embodiments. Based on the spirit of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work belong to the protection scope of the present invention.

[0043] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0044] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, it can also be the internal connection of two components, it can be a wireless connection, or it can be a wired connection. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0045] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0046] like Figure 1 As shown, embodiment 1 of the present invention provides a converter valve state monitoring sensor and a composite power supply device thereof, including: a temperature difference energy acquisition module 10, a power management module 20, a state monitoring sensor 30 and a space magnetic field energy acquisition module 40;

[0047] The temperature difference energy acquisition module 10 is an electric energy generating device that collects the temperature difference energy of the converter valve and outputs direct current electric energy to the power management module 20;

[0048] The spatial magnetic field energy acquisition module 40 is an electric energy generating device that collects the wide-band magnetic field energy of the converter valve space, and outputs AC power to the power management module 20;

[0049] The power management module 20 realizes efficient energy collection and charge and discharge management through a dual-path power tracking algorithm, and supplies power to the status monitoring sensor 30;

[0050] The state monitoring sensor 30 is used to monitor the state information of the converter valve.

[0051] Specifically, Figure 2 , which is a structural diagram of a temperature difference energy harvesting module, the temperature difference energy harvesting module 10 includes: a Cu heat collecting plate 11 , a temperature difference power generation array 12 and a fin heat sink 13 .

[0052] The Cu heat collecting plate 11 is deployed at the heating position of the converter valve. The hot end of the thermoelectric power generation array 12 is in close contact with the heat source of the converter valve through the Cu heat collecting plate 11. The cold end of the thermoelectric power generation array 12 exchanges heat with the air through the fin heat sink 13, thereby generating a temperature difference environment. The thermoelectric power generation array 12 generates DC power output based on the Seebeck effect.

[0053] Specifically, Figure 3 , which is a structural diagram of a space magnetic field energy harvesting module, the space magnetic field energy harvesting module 40 includes: an I-shaped magnetic core 41 , a multi-layer planar coil 42 and a flexible substrate 43 .

[0054] Considering that the intrusive energy harvesting structure needs to be inserted into the transmission line or AC bus, it has poor operability and high maintenance costs in the later stage. The non-intrusive energy harvesting module is placed outside the energy harvesting device and harvests energy through external coupling, which helps to improve the flexible deployment in the complex broadband magnetic field environment of the converter valve. Therefore, the multi-layer planar coil 42 of the space magnetic field energy harvesting module 40 is arranged on a flexible substrate 43 with a central opening, and the I-shaped magnetic core 41 passes through the middle opening of the flexible substrate 43. The multi-layer planar coil 42 generates AC power output based on the law of electromagnetic induction.

[0055] Specifically, there is a preferred placement direction for the space magnetic field energy harvesting module, which is determined according to the magnetic field directions at different positions of the converter valve so that the magnetic field can better pass through the coil.

[0056] Specifically, Figure 4 , 5 As shown, considering that although the converter valve has a complex wide-range spatial magnetic field, its spatial magnetic field energy is often concentrated at certain frequency points, in order to collect magnetic field energy at more frequency points and improve the magnetic field energy output power, the present invention proposes a multi-layer planar coil 42 to achieve multiple frequency points designed at frequency points with higher magnetic field energy, thereby effectively expanding the energy extraction frequency band range.

[0057] In one embodiment, if Figure 6 As shown, the power management module 20 includes: a magnetic field energy power tracking unit 21, a temperature difference energy power tracking unit 22, a rectification unit 23, an energy storage unit 24, a discharge control unit 25 and a DC / DC conversion unit 26.

[0058] Specifically, Figure 6 As shown, the magnetic field energy acquisition power tracking unit 21 realizes the high-efficiency output of the space magnetic field energy acquisition module 40 through the power tracking algorithm, and inputs it into the energy storage unit 24 after the rectification unit 23 and AC-DC rectification conversion; the temperature difference energy acquisition power tracking unit 22 realizes the high-efficiency output of the temperature difference energy acquisition module 10 through the power tracking algorithm, and inputs it into the energy storage unit 24 in the form of direct current;

[0059] Specifically, the discharge control unit 25 controls the discharge through the discharge control strategy and the state of the energy storage unit 24 , and the DC-DC conversion unit 26 changes the voltage output by the discharge control unit 23 to meet the energy demand of the state monitoring sensor 30 .

[0060] In one embodiment, if Figure 7 As shown, the state monitoring sensor 30 includes: a power supply interface, a control unit 31, a state sensing unit 32, an A / D conversion unit 33 and a wireless communication unit 34.

[0061] The power supply interface is connected to the output interface of the power management module, and the state monitoring sensor is powered by a composite power supply device. The control unit 31, the state sensing unit 32, the A / D conversion unit 33 and the wireless communication unit 34 are all provided with power by the power management module 20; the control unit 31 controls the operation of each unit of the state monitoring sensor 30, the state sensing unit 32 converts the temperature signal into an analog electrical signal, the A / D conversion unit 33 realizes the conversion of the analog signal into a digital signal, and the wireless communication unit 34 wirelessly sends the converter valve state data information to the monitoring main station.

[0062] Embodiment 2 of the present invention provides a composite power supply method for a converter valve state monitoring sensor, which is applied to the composite power supply device for a converter valve state monitoring sensor described in Embodiment 1, and includes:

[0063] The magnetic field energy acquisition power tracking unit realizes high-efficiency output of the space magnetic field energy acquisition module through a power tracking algorithm, and inputs the energy storage unit after the rectification unit and AC-DC rectification conversion;

[0064] The temperature difference energy acquisition power tracking unit realizes high-efficiency output of the temperature difference energy acquisition module through a power tracking algorithm, and inputs the energy storage unit in the form of direct current;

[0065] The discharge control unit controls the discharge through the discharge control strategy and the state of the energy storage unit, and the DC-DC conversion unit changes the voltage output by the discharge control unit to meet the energy demand of the state monitoring sensor.

[0066] The present invention firstly realizes efficient collection of converter valve environmental energy through efficient coupling of the converter valve temperature difference energy acquisition module and the spatial broadband magnetic field energy acquisition module, thereby ensuring the continuity and stability of the converter valve monitoring sensor power supply. In addition, the spatial broadband magnetic field energy acquisition module expands the magnetic field energy acquisition capability through the multi-layer planar coil design, realizing the collection of abundant broadband magnetic field energy in the converter valve environment, and on the other hand, realizes the miniaturization of the broadband magnetic field energy acquisition device, improves the flexibility of application deployment, and makes the magnetic field energy collection no longer limited to the vicinity of the converter valve busbar, thus expanding the scope of sensor power supply and the types of converter valve status monitoring services.

[0067] The present invention first proposes a temperature difference energy extraction scheme for the temperature difference energy in the operation process of the converter valve. The temperature difference between the hot and cold ends of the thermocouple arm is increased by using a Cu collector plate and a fin heat sink, thereby increasing the utilization capacity of the low-grade heat source of the converter valve, and collecting the temperature difference energy of the converter valve to realize self-power supply of the sensor.

[0068] In addition, in order to address the problems of stability and sustainability of energy supply by single temperature difference energy extraction of converter valves, a method of supplementing the energy supply by collecting broadband magnetic field energy in the converter valve space is proposed. A broadband magnetic field efficient collection method and a miniaturized energy extraction design scheme are also proposed. This solves the problem that the power frequency magnetic field energy extraction device can generally only be installed in locations with high power frequency magnetic field intensity, such as the surface of the converter valve busbar or its surroundings, thereby expanding the application capability and scope of use of self-energy extraction sensors in the converter valve space.

[0069] It should be noted that the present invention adopts an I-shaped magnetic core. Since the closed magnetic core is used to gather the surrounding industrial frequency magnetic field around the conductors, busbars, etc., and in the converter valve scenario, except for the converter valve busbar, the remaining magnetic fields are mostly open broadband and high-frequency magnetic fields generated by the frequent switching process of the valve body, and it is impossible to obtain magnetic field energy through the closed magnetic core. The I-shaped magnetic core can better gather the spatial broadband magnetic field through reasonable placement, increase the magnetic flux and magnetic flux change rate passing through the multi-layer planar coil, thereby improving the power output capacity.

[0070] The present disclosure may be a system, a method and / or a computer program product. The computer program product may include a computer-readable storage medium carrying computer-readable program instructions for causing a processor to implement various aspects of the present disclosure.

[0071] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents, and any modifications or equivalent replacements that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A composite power supply device for a converter valve status monitoring sensor, characterized in that: The device includes a temperature difference energy acquisition module, a power management module and a space magnetic field energy acquisition module, wherein: The temperature difference energy acquisition module and the space magnetic field energy acquisition module are respectively connected to the power management module; The temperature difference energy acquisition module is deployed at the heating point of the converter valve, and is used to collect the temperature difference energy of the converter valve and output direct current to the power management module; the space magnetic field energy acquisition module includes a multi-layer planar coil, which is used to collect the spatial broadband magnetic field energy of the converter valve and output alternating current to the power management module; the power management module is used for electric energy collection and charge and discharge management, and supplies power to the status monitoring sensor.

2. A converter valve state monitoring sensor composite power supply device according to claim 1, characterized in that: The temperature difference energy harvesting module comprises: a Cu heat collecting plate, a temperature difference power generation array and a fin heat sink; The Cu heat collecting plate and the fin heat sink are respectively connected to the temperature difference power generation array; The Cu heat collecting plate is deployed at the heating position of the converter valve. The hot end of the thermoelectric power generation array contacts the heat source of the converter valve through the Cu heat collecting plate, and the cold end of the thermoelectric power generation array exchanges heat with the air through the fin heat sink, thereby generating a temperature difference environment. The thermoelectric power generation array generates DC power and outputs it to the power management module.

3. The composite power supply device for a converter valve state monitoring sensor according to claim 1, characterized in that: The spatial magnetic field energy harvesting module comprises an I-shaped magnetic core, a multi-layer planar coil and a flexible substrate; The multi-layer planar coil of the space magnetic field energy acquisition module is arranged on a flexible substrate with a central opening, and the I-shaped magnetic core passes through the middle opening part of the flexible substrate. The multi-layer planar coil generates AC power and outputs it to the power management module.

4. The composite power supply device for a converter valve state monitoring sensor according to claim 1, characterized in that: The power management module includes a magnetic field energy acquisition power tracking unit, a temperature difference energy acquisition power tracking unit, a rectification unit, an energy storage unit, a discharge control unit and a DC / DC conversion unit; The magnetic field energy-taking power tracking unit is connected to the rectifying unit, and the rectifying unit is connected to the energy storage unit; the temperature difference energy-taking power tracking unit is directly connected to the energy storage unit; the energy storage unit is connected to the discharge control unit, and the discharge control unit is connected to the DC / DC conversion unit; The magnetic field energy acquisition power tracking unit is used to process the alternating current output of the space magnetic field energy acquisition module, and the alternating current is rectified and transformed by the rectifying unit and then input into the energy storage unit in the form of direct current; The temperature difference energy acquisition power tracking unit is used to process the DC output of the temperature difference energy acquisition module and input it into the energy storage unit in the form of DC; The discharge control unit is used to control discharge, and the DC-DC conversion unit changes the voltage output by the discharge control unit.

5. A converter valve status monitoring sensor connected to the composite power supply device according to any one of claims 1 to 4, characterized in that: The state monitoring sensor includes a power supply interface, a control unit, a state sensing unit, an A / D conversion unit and a wireless communication unit; The power interface is connected to the output interface of the power management module, and the composite power supply device supplies power to the status monitoring sensor; The state sensing unit, the A / D conversion unit and the wireless communication unit are respectively connected to the control unit, the state sensing unit is connected to the A / D conversion unit, and the A / D conversion unit is connected to the wireless communication unit; The control unit controls the operation of each unit of the status monitoring sensor. The status sensing unit converts the temperature signal into an analog electrical signal. The A / D conversion unit is used to convert the analog signal into a digital signal. The wireless communication unit is used to wirelessly send the converter valve status data information to the monitoring main station.

6. A composite power supply method for a converter valve state monitoring sensor, applied to the composite power supply device for a converter valve state monitoring sensor according to any one of claims 1 to 4, characterized in that: The method comprises: The temperature difference energy of the converter valve is collected at the heating point of the converter valve and converted into direct current output, and the spatial broadband magnetic field energy of the converter valve is collected at any position of the converter valve and converted into alternating current output; The DC output and AC output are rectified and transformed accordingly, so that the electric energy is input into the energy management unit in the form of DC power, and then the state monitoring sensor is powered.

7. The composite power supply method for converter valve state monitoring sensor according to claim 6 is characterized in that: The collecting of the converter valve temperature difference energy and converting it into electrical energy specifically includes: The Cu thermal collector of the temperature difference energy harvesting module is deployed at the heating position of the converter valve, so that the hot end of the temperature difference power generation array contacts the heat source of the converter valve through the Cu thermal collector, and the cold end of the temperature difference power generation array exchanges heat with the air through the fin heat sink, generating a temperature difference environment, and then generating DC power output.

8. The composite power supply method for converter valve status monitoring sensor according to claim 6 is characterized in that: The collecting of the wide-band magnetic field energy of the converter valve space and converting it into electrical energy specifically includes: The spatial magnetic field energy acquisition module collects the wide-band magnetic field energy of the converter valve and converts it into electrical energy; The multi-layer planar coils of the space magnetic field energy harvesting module are arranged on a flexible substrate with a central opening, and the I-shaped magnetic core passes through the middle opening of the flexible substrate; The multi-layer planar coil collects the spatial magnetic field energy of the converter valve and generates AC power output.

9. The composite power supply method for converter valve state monitoring sensor according to claim 6, characterized in that: The method further comprises: When collecting temperature difference energy and spatial broadband magnetic field energy and converting them into electrical energy output, the power tracking algorithm is used to optimize its output power.

10. The composite power supply method for converter valve state monitoring sensor according to claim 8, characterized in that: The specifications of the multi-layer planar coils are inconsistent, and their specifications are differentiated according to the different spatial magnetic field frequency ranges of the converter valve.

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