A non-contact spatial magnetic field energy collection device for a power transmission tower and a construction method, system and medium

Abstract

This invention relates to the field of non-contact energy harvesting technology for power transmission towers. Specifically, it relates to a non-contact spatial magnetic field energy harvesting device, construction method, system, and medium for power transmission towers. The structure provided by this invention mainly includes a cylindrical energy-harvesting magnetic core and sheet-like magnetic focusing components disposed at both ends of the cylindrical energy-harvesting magnetic core. The cylindrical energy-harvesting magnetic core is used to intercept magnetic flux in the spatial magnetic field generated by the power frequency current of the conductor. An induction coil is wound around the cylindrical energy-harvesting magnetic core. The hollow dumbbell-shaped structure provided by this invention, when arranged in the space near the power transmission conductor, eliminates the need to surround the conductor or cut or strip the insulation layer. The installation process requires no power outage or only a short-term crossing operation, significantly reducing construction difficulty and operational risks.

Description

Technical Field

[0001] This invention relates to the field of non-contact energy harvesting technology for power transmission towers, and more specifically, to a non-contact space magnetic field energy harvesting device, construction method, system, and medium for power transmission towers. Background Technology

[0002] Overhead high-voltage transmission lines are a crucial link in the power system for long-distance power transmission. As power grids develop towards intelligence and digitalization, a large number of online monitoring devices, video surveillance equipment, status sensing sensors, and communication terminals need to be deployed along transmission lines to collect real-time information on conductor temperature, sag, galloping, icing, wind deflection, and operating environment. Traditional power supply methods, such as wired power supply, battery power supply, and solar power supply along transmission lines, are not only costly to construct and maintain, but are also significantly affected by installation conditions and environmental factors, making it difficult to consistently and stably meet the power supply needs of a large number of distributed sensing nodes.

[0003] Compared to other energy harvesting methods such as solar, wind, and vibration energy, the spatial power frequency magnetic field generated on the side of transmission towers during line operation has unique advantages. Taking a 110 kV AC transmission line as an example, a relatively stable power frequency AC magnetic field is formed around the conductor during normal operation. The spatial magnetic induction intensity is mainly determined by the line's operating state and is almost unaffected by external environmental conditions such as sunlight and climate. Utilizing this power frequency magnetic field for energy harvesting enables "energy harvesting along the line and power supply on demand," making it one of the ideal power supply methods for online monitoring sensors in transmission tower line scenarios. It is expected to effectively support large-scale, long-term online monitoring applications.

[0004] However, transmission towers are high-voltage equipment. Traditional contact-based energy harvesting methods (such as current transformer-based energy harvesting structures) typically require direct mounting on the outside of the conductors, meaning they must be directly connected to the high-voltage conductors. This not only necessitates power outages for installation but also fails to directly power the monitoring terminals installed on the tower, requiring excessively long cables for current diversion, which poses a significant risk of insulation breakdown and safety hazards. Existing independent magnetic field energy harvesting devices mostly employ a single cylindrical magnetic core structure. The distance between the tower crossarm and the high-voltage conductors maintains a certain safety insulation distance, resulting in a weak spatial magnetic field distribution in this area. Conventional single-core induction structures, due to their limited magnetic concentration area and low magnetic circuit utilization, struggle to capture sufficient electrical energy to drive the sensor in the weak spatial magnetic field, leading to low energy density per unit volume and limiting their application in practical engineering. This invention addresses the self-powered scenario of transmission tower sensors by presenting a non-contact spatial magnetic field energy harvesting device with a highly concentrated magnetic structure. While ensuring electrical safety and ease of installation, it achieves efficient energy harvesting from the power frequency spatial magnetic field of transmission towers. Summary of the Invention

[0005] The purpose of this invention is to provide a non-contact space magnetic field energy harvesting device, construction method, system, and medium for power transmission towers, in order to solve the above-mentioned problems in the prior art.

[0006] This invention is achieved through the following technical solution:

[0007] A first aspect is a method for constructing a non-contact space magnetic field energy harvesting device for power transmission towers, characterized in that it includes: A three-dimensional finite element model was established, which includes the power transmission conductor, the cylindrical energy harvesting magnetic core, the sheet-shaped magnetic focusing component, and the cylindrical covering structure. Multivariable sweep simulation was performed on several set parameters of a three-dimensional finite element model. Using the open-circuit induced voltage in the cylindrical energy harvesting core as the objective function, the parameter combination that maximizes the objective function or satisfies the preset threshold is selected as the preferred structural parameters, and the preferred structural parameters are output to the display terminal.

[0008] Preferably, the objective function for construction includes:

[0009] In the formula, This is the open-circuit induced voltage. The angular frequency of the external alternating magnetic field. The effective relative permeability of the magnetic core. The number of turns of the induction coil. The spatial magnetic flux density of the environment surrounding the transmission line. It is the effective cross-sectional area of ​​the region where the cylindrical energy extraction core is surrounded by the coil.

[0010] Preferably, the effective relative permeability includes:

[0011] In the formula, The length of the cylindrical energy-harvesting magnetic core. The thickness of the sheet-like magnetic focusing component, The outer diameter of the sheet-like magnetic focusing component. The diameter of the cylindrical energy-harvesting magnetic core. This is an intermediate parameter for the equivalent aspect ratio. For the related parameters, denoted as ρ, where ρ is the relative permeability of the cylindrical energy harvesting core material.

[0012] Secondly, the present invention also provides a non-contact space magnetic field energy harvesting device for power transmission towers, comprising a columnar energy harvesting magnetic core and sheet-shaped magnetic focusing components disposed at both ends of the columnar energy harvesting magnetic core. The columnar energy harvesting magnetic core is used to intercept magnetic flux in the space magnetic field generated by the power frequency current of the conductor, and an induction coil is wound around the columnar energy harvesting magnetic core.

[0013] Preferably, the sheet-like magnetic focusing component is covered with a covering member to shield and guide the magnetic field around the device.

[0014] Preferably, the sheet-shaped magnetic core is a disc-shaped or polygonal sheet-shaped magnetic core with a diameter larger than that of the cylindrical energy harvesting magnetic core.

[0015] Preferably, it also includes an energy management module. The two terminals of the cylindrical energy harvesting magnetic core are connected to the energy management module via a rectifier and filter circuit. The energy management module includes an impedance matching unit, an energy storage unit, and a voltage regulation output unit.

[0016] Preferably, the covering structure is made of a high magnetic permeability material or a conductive shielding material, and the outer diameter of the covering structure is equal to the outer diameter of the sheet-like magnetic focusing component.

[0017] Thirdly, the present invention also provides a construction system for a non-contact space magnetic field energy harvesting device for transmission towers, which is used in the above-mentioned construction method for a non-contact space magnetic field energy harvesting device for transmission towers, comprising: The simulation module is configured to build a three-dimensional finite element model that includes a transmission line, a cylindrical energy harvesting core, a sheet-like magnetic focusing component, and a cylindrical covering structure; and to perform multivariate scanning simulation on several set parameters of the three-dimensional finite element model. The output module is configured to take the open-circuit induced voltage in the cylindrical energy harvesting core as the objective function, select the parameter combination that maximizes the objective function or satisfies the preset threshold as the preferred structural parameters, and output the preferred structural parameters to the display terminal.

[0018] Fourthly, the present invention also provides a computer-readable storage medium storing a computer program that, when executed by a processor, implements the above-described method for constructing a non-contact space magnetic field energy harvesting device for power transmission towers.

[0019] The technical solution of the present invention has at least the following advantages and beneficial effects: The structure provided by this invention mainly includes a cylindrical energy-harvesting magnetic core and sheet-like magnetic focusing components disposed at both ends of the cylindrical energy-harvesting magnetic core. The cylindrical energy-harvesting magnetic core is used to intercept magnetic flux in the spatial magnetic field generated by the power frequency current of the conductor. An induction coil is wound around the cylindrical energy-harvesting magnetic core. The hollow dumbbell-shaped structure provided by this invention, when placed in the space near the transmission line, eliminates the need to surround the conductor or to cut or remove the insulation layer. The installation process requires no power outage or only a short-term crossing operation, significantly reducing construction difficulty and operational risks.

[0020] By optimizing the aspect ratio of the cylindrical energy harvesting core, expanding the cross-sectional area of ​​the sheet-like magnetic focusing components at both ends, and forming a secondary magnetic focusing channel with a cylindrical covering structure, this invention can effectively gather the power frequency magnetic flux around the conductor under non-closed magnetic circuit conditions, making the effective magnetic flux density in the cylindrical energy harvesting core significantly higher than that of a single cylindrical magnetic core structure, thereby significantly improving the output power per unit volume. Attached Figure Description

[0021] To more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of the present invention and should not be regarded as a limitation on the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the overall arrangement of the non-contact space magnetic field energy harvesting device and the overhead power transmission line of the present invention. Figure 2 This is a schematic diagram of the non-contact space magnetic field energy harvesting device of the present invention; Figure 3 This is an axial cross-sectional schematic diagram of the non-contact space magnetic field energy harvesting device of the present invention; Figure 4 This is a block diagram of the energy management circuit of the non-contact space magnetic field energy harvesting device of the present invention; Figure 5 This is a schematic diagram of the structural parameter optimization method of the present invention.

[0023] Icons: 1-Columnar energy harvesting magnetic core, 2-Induction coil, 3-Sheet-shaped magnetic focusing component, 4-Covering structure, 5-Supporting and fixing mechanism, 6-Energy management module, 7-Online monitoring equipment, 8-Energy storage unit, 9-Transmission line. Detailed Implementation

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. The components of the embodiments of the present invention described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.

[0025] The independently described modules or sub-modules may or may not be physically separated; they may be implemented in software or hardware, and some modules or sub-modules may be implemented in software, with the processor calling the software to implement the function of these modules or sub-modules, while other modules or sub-modules may be implemented in hardware, such as through hardware circuits. Furthermore, some or all of the modules can be selected to achieve the purpose of this application's solution according to actual needs.

[0026] Please refer to Figures 1-5 The present invention provides a method for constructing a non-contact space magnetic field energy harvesting device for power transmission towers, comprising: A three-dimensional finite element model was established, which includes the power transmission conductor, the cylindrical energy harvesting magnetic core, the sheet-shaped magnetic focusing component, and the cylindrical covering structure. Multivariable sweep simulation was performed on several set parameters of a three-dimensional finite element model. Using the open-circuit induced voltage in the cylindrical energy harvesting core as the objective function, the parameter combination that maximizes the objective function or satisfies the preset threshold is selected as the preferred structural parameters, and the preferred structural parameters are output to the display terminal.

[0027] Specifically, according to Faraday's principle of electromagnetic induction, the open-circuit induced voltage generated by the induction coil in a changing external magnetic field is used as the objective function:

[0028] In the formula, This is the open-circuit induced voltage. The angular frequency of the external alternating magnetic field. The effective relative permeability of the magnetic core. The number of turns of the induction coil. The spatial magnetic flux density of the environment surrounding the transmission line. It is the effective cross-sectional area of ​​the region where the cylindrical energy extraction core is surrounded by the coil.

[0029] To enable the device to transfer maximum power to the electrical load or energy management module 6, impedance matching is required in the circuit. This matching must be achieved when the load resistance matches the equivalent internal resistance of the induction coil 2. The maximum load power output of the system when the inductance is equal and the coil self-inductance is completely offset by the compensation capacitor. It can be calculated by the following formula In power transmission tower scenarios where installation space is limited, the power density per unit volume of the booster device is improved. The core objective of optimized design is power density. The expression is ,in This refers to the overall geometric volume of the energy harvesting device, including the magnetic core and induction coil 2. As shown in the above formula, given the external magnetic field parameters, the key to increasing the output power and power density lies in accurately solving for and maximizing the effective relative permeability of the magnetic core. .

[0030] Because the hollow dumbbell-shaped structure of this invention is a non-closed magnetic circuit, when the magnetic core is subjected to an external magnetic field... During magnetization, the magnetic poles at both ends of the magnetic core will generate a demagnetizing field that is opposite to the direction of the external magnetic field. This leads to the actual magnetic field strength inside the magnetic core. The demagnetizing field is determined by the demagnetizing factor. The effective relative permeability is determined by the magnetization of the magnetic core, and derivation shows that it satisfies the following relationship: ,in The relative permeability of the cylindrical energy harvesting core material Let the outer diameter of the two-end sheet-like magnetic focusing component 3 be... Thickness set to The diameter of the intermediate cylindrical energy-harvesting magnetic core 1 is , length is The combined structure is geometrically equivalent, and the total length of the equivalent magnetic core is... It can be represented as Introduced with the outer diameter of the sheet-like magnetic focusing component 3 and thickness Strongly correlated volume correction term Combining the intermediate parameters of the equivalent aspect ratio and its related parameters The effective relative magnetic permeability of the structure after adding the sheet-like magnetic focusing component 3 The analytical equation is:

[0031] In the formula, The length of the cylindrical energy-harvesting magnetic core. The thickness of the sheet-like magnetic focusing component, The outer diameter of the sheet-like magnetic focusing component. The diameter of the cylindrical energy-harvesting magnetic core. This is an intermediate parameter for the equivalent aspect ratio. For the related parameters, denoted as ρ, where ρ is the relative permeability of the cylindrical energy harvesting core material.

[0032] After determining the basic optimized structural parameters of the cylindrical energy harvesting core 1 and the sheet-like magnetic focusing assembly 3 based on analytical equations, this invention further introduces a secondary optimization step for the cylindrical covering structure 4 in the structural parameter optimization method to further suppress spatial magnetic leakage and improve the overall magnetic circuit utilization. The cylindrical covering structure 4 is coaxially sleeved inside the sheet-like magnetic focusing assembly 3. Its physical mechanism lies in constructing a low magnetic resistance magnetic flux return channel around the device to achieve secondary magnetic focusing of the cylindrical energy harvesting core 1, while also shielding and guiding external interference magnetic fields. Considering that the cylindrical covering structure 4 introduces complex external boundary conditions, the nonlinear magnetic field coupling effect between it and the basic magnetic core structure is difficult to accurately characterize with a single analytical equation. Therefore, this invention adopts a joint optimization strategy combining theoretical analysis and finite element simulation.

[0033] Specifically, relying on the aforementioned effective relative permeability After quickly determining the parameter range of the hollow dumbbell-shaped basic magnetic core using analytical equations, a complete three-dimensional finite element simulation model including the cylindrical covering structure 4 was established. The inner diameter of the cylindrical covering structure 4 was then determined. outer diameter of cylinder Cylinder wall thickness cylinder length As a secondary optimization variable, a local multivariate parameter scan is performed near the determined basic core parameters. By comparing the increase in average magnetic flux density inside the cylindrical energy harvesting core 1 and the actual output power variation trend of the induction coil 2 under different cladding structure sizes, the optimal geometric dimensions of the cylindrical cladding structure 4 are determined.

[0034] Based on the above theoretical analysis and derivation, the present invention conducted the following three-dimensional finite element simulation experiment to verify the magnetizing effect. In the simulation experiment, to intuitively compare the superiority of the structure proposed in this invention, four different configurations of energy harvesting device structural models were used for comparison, namely structure A: using a single... Cylindrical energy harvesting core; Structure B: In The two ends of the cylindrical energy harvesting core are fixedly connected A conventional H-type magnetic core structure formed by sheet-like magnetic focusing components; Structure C: Based on structure B, an outer diameter is coaxially sleeved on the outside. inner diameter high A cylindrical covering structure forms the hollow dumbbell-shaped high-concentration magnetic structure proposed in this invention; Structure D: Physical experiment of the hollow dumbbell-shaped high-concentration magnetic structure of Structure C. In the simulation settings, the materials of the magnetic core, sheet-like magnetic concentrating component, and cylindrical covering structure are all set to manganese-zinc ferrite material with a relative permeability of 3300. The induction coil is set to a fixed number of turns N of 1500 and a winding copper wire diameter of 0.4mm. The simulation models of the four structures are placed in the same power frequency uniform alternating magnetic field generated by the equivalent power transmission conductor. The magnetic field strength is set to 15.9A / m. The electromagnetic field and circuit are solved jointly based on finite element simulation software. The boundary state is set to open. The core evaluation indicators such as the internal effective magnetic flux density, effective relative permeability, open circuit voltage, and final power density of each structure are extracted. The specific simulation results are shown in Table 1. Table 1 Simulation Results

[0035] The present invention also provides a non-contact space magnetic field energy harvesting device for power transmission towers, comprising: a columnar energy harvesting magnetic core 1 for intercepting magnetic flux in the space magnetic field generated by the power frequency current of the conductor; and an induction coil 2 wound around the outer periphery of the columnar energy harvesting magnetic core 1 for converting the changing magnetic flux in the columnar energy harvesting magnetic core 1 into alternating current. The sheet-shaped magnetic focusing components 3, disposed at both ends of the columnar energy harvesting magnetic core 1, are used to expand the effective cross-sectional area of ​​the intercepted magnetic flux and guide the magnetic flux into the columnar energy harvesting magnetic core 1. The cylindrical covering structure 4, which is sleeved on the outside of the sheet-like magnetic gathering component 3, is used to shield and guide the magnetic field around the device, suppress magnetic leakage, and realize secondary magnetic gathering of the columnar energy harvesting core 1.

[0036] The axis of the columnar energy harvesting magnetic core 1 is basically parallel to the axis of the transmission line 9. The center of the sheet-like magnetic focusing component 3 is coaxially arranged with the axis of the columnar energy harvesting magnetic core 1. The cylindrical covering structure 4 is coaxially sleeved on the outside of the sheet-like magnetic focusing component 3 to form an integral hollow dumbbell-shaped high magnetic focusing structure.

[0037] The columnar energy harvesting core 1 is made of high-permeability magnetic ferrite material or nanocrystalline soft magnetic alloy. The length-to-diameter ratio L / D of its length L and diameter D is selected within a preset range to reduce the demagnetization factor and increase the effective relative permeability. Preferably, the value of L / D is in the range of L1 to L2, where L1 and L2 are determined comprehensively based on factors such as demagnetization factor requirements, structural strength, and installation space constraints.

[0038] The sheet-shaped magnetic core 3 is a disc-shaped or polygonal sheet-shaped magnetic core with a diameter larger than that of the columnar energy harvesting core 1, used to expand the magnetic flux cross-sectional area in the magnetic field concentration area; the thickness of the sheet-shaped magnetic core 3 is determined according to the magnetic flux density and the saturation magnetic induction intensity of the material, so as to balance the magnetic flux carrying capacity and the structural weight.

[0039] The cylindrical covering structure 4 is made of a high magnetic permeability material or a conductive shielding material, and its outer diameter is equal to the outer diameter of the sheet-like magnetic gathering component 3. By reasonably setting the inner diameter, wall thickness and length of the cylindrical covering structure 4, the overall volume and mass can be controlled while suppressing magnetic leakage and increasing the effective magnetic flux density of the columnar energy harvesting core 1.

[0040] The two terminals of the induction coil 2 are connected to the energy management module 6 via a rectifier and filter circuit. The energy management module 6 includes an impedance matching unit, an energy storage unit 8, and a voltage regulation output unit, which is used to rectify the AC power output by the induction coil 2 into DC power and provide maximum power matching and voltage regulation for the entire device.

[0041] like Figure 1 and Figure 2 As shown in the figure, this embodiment provides a non-contact space magnetic field energy harvesting device SX for self-powered sensors of power transmission towers. It is installed inside the crossarm angle steel of the overhead power transmission tower 9 and includes a columnar energy harvesting magnetic core 1, an induction coil 2, a sheet-like magnetic focusing assembly 3, a cylindrical covering structure 4, a support and fixing mechanism 5, and an energy management module 6.

[0042] The cylindrical energy harvesting core 1 is a cylindrical integral core, with its axis substantially perpendicular to the axis of the transmission conductor 9. Preferably, the length Lc of the cylindrical energy harvesting core 1 is within the range of Lc1 to Lc2, where Lc1 and Lc2 are determined based on the current rating of the transmission conductor, the installation distance of the device, and the permeability of the core material; the diameter Dc of the cylindrical energy harvesting core 1 is within the range of Dc1 to Dc2, where Dc1 and Dc2 are determined based on a combination of flux carrying capacity, allowable weight of the device, and installation space dimensions. The cylindrical energy harvesting core 1 is made of manganese-zinc ferrite or nanocrystalline soft magnetic alloy, and preferably, its relative permeability μ is within the range of μ1 to μ2, where μ1 and μ2 are determined based on the target magnetic focusing capability, material loss at the operating frequency, and material availability.

[0043] The induction coil 2 is wound around the outer periphery of the middle part of the cylindrical energy harvesting core 1. The number of turns N of the induction coil 2 is determined according to the target output voltage and the operating current density of the device. When arranging the coil, the coil is reliably isolated from the cylindrical energy harvesting core 1 by an insulating frame to improve the electrical insulation level.

[0044] The sheet-like magnetic focusing assembly 3 is disposed at both ends of the cylindrical energy harvesting magnetic core 1, with each end including at least one disk-shaped magnetic core. The center of the disk-shaped magnetic core is coaxial with the axis of the cylindrical energy harvesting magnetic core 1. Preferably, the outer diameter Dp of the disk-shaped magnetic core is k1 to k2 times the diameter Dc of the cylindrical energy harvesting magnetic core, where k1 and k2 are determined according to the magnetic focusing cross-sectional area requirements, the overall size of the device, and structural weight limitations, in order to expand the interception area of ​​the spatial magnetic field. The sheet-like magnetic focusing assembly 3 and the cylindrical energy harvesting magnetic core 1 are fixed together by adhesive bonding or tight fitting to ensure good magnetic circuit contact.

[0045] The cylindrical covering structure 4 is coaxially sleeved inside the sheet-like magnetic focusing component 3, including a cylindrical body and openings at both ends; the inner diameter Ds of the cylindrical body is equal to the maximum outer diameter of the sheet-like magnetic focusing component 3 or the outer diameter Dt of the cylindrical body is equal to the maximum outer diameter of the sheet-like magnetic focusing component 3, and the wall thickness Ts and length Ls of the cylindrical body are determined according to the magnetic shielding requirements and structural strength.

[0046] The supporting and fixing mechanism 5 is used to install the entire device near the transmission line 9, and can take the form of an insulating bracket, clamp, or suspension arm. Preferably, the supporting and fixing mechanism 5 is made of composite insulating material, one end of which is fixed to the crossarm of the tower or metal bracket by hardware, and the other end is connected to the main body of the device by an insulating tie rod to ensure a sufficient electrical safety distance.

[0047] The energy management module 6 is installed inside the device housing or integrated into the device. The input terminal of the energy management module 6 is connected to the output terminal of the induction coil 2, and the output terminal is connected to the online monitoring device 7 and the energy storage unit 8. It is used to rectify, store, and regulate the induced electrical energy. A system for constructing a non-contact space magnetic field energy harvesting device for power transmission towers, comprising the above-mentioned method for constructing a non-contact space magnetic field energy harvesting device for power transmission towers, including: The simulation module is configured to build a three-dimensional finite element model that includes a transmission line, a cylindrical energy harvesting core, a sheet-like magnetic focusing component, and a cylindrical covering structure; and to perform multivariate scanning simulation on several set parameters of the three-dimensional finite element model. The output module is configured to use the open-circuit induced voltage in the cylindrical energy harvesting core as the objective function, select a parameter combination that maximizes the objective function or satisfies a preset threshold as the preferred structural parameters, and output the preferred structural parameters to the display terminal.

[0048] Furthermore, the functional units in the various embodiments of the present invention can be integrated into one processing unit, or each unit can exist physically separately, or two or more units can be integrated into one unit. The integrated unit can be implemented in hardware or as a software functional unit.

[0049] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. This computer software product, stored in a storage medium, includes several instructions to cause a computer device (which may be a personal computer, server, or network device, etc.) to execute all or part of the steps of the methods of the various embodiments of the present invention. The aforementioned storage medium includes various media capable of storing program code, such as USB flash drives, portable hard drives, read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks.

[0050] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for constructing a non-contact space magnetic field energy harvesting device for power transmission towers, characterized in that, include: A three-dimensional finite element model was established, which includes the power transmission conductor, the cylindrical energy harvesting magnetic core, the sheet-shaped magnetic focusing component, and the cylindrical covering structure. Multivariable sweep simulation was performed on several set parameters of a three-dimensional finite element model. Using the open-circuit induced voltage in the cylindrical energy harvesting core as the objective function, the parameter combination that maximizes the objective function or satisfies the preset threshold is selected as the preferred structural parameters, and the preferred structural parameters are output to the display terminal.

2. The method for constructing a non-contact space magnetic field energy harvesting device for power transmission towers according to claim 1, characterized in that, The objective function for construction includes: In the formula, This is the open-circuit induced voltage. The angular frequency of the external alternating magnetic field. The effective relative permeability of the magnetic core. The number of turns of the induction coil. The spatial magnetic flux density of the environment surrounding the power transmission line. It is the effective cross-sectional area of ​​the region where the cylindrical energy extraction core is surrounded by the coil.

3. A method for constructing a non-contact space magnetic field energy harvesting device for power transmission towers according to claim 2, characterized in that, The effective relative permeability includes: In the formula, The length of the cylindrical energy-harvesting magnetic core. The thickness of the sheet-like magnetic focusing component, The outer diameter of the sheet-like magnetic focusing component. The diameter of the cylindrical energy-harvesting magnetic core. This is an intermediate parameter for the equivalent aspect ratio. For the related parameters, denoted as ρ, where ρ is the relative permeability of the cylindrical energy harvesting core material.

4. A non-contact space magnetic field energy harvesting device for power transmission towers, characterized in that, It includes a cylindrical energy harvesting magnetic core and sheet-shaped magnetic focusing components disposed at both ends of the cylindrical energy harvesting magnetic core. The cylindrical energy harvesting magnetic core is used to intercept magnetic flux in the spatial magnetic field generated by the power frequency current of the conductor. An induction coil is wound around the cylindrical energy harvesting magnetic core.

5. A non-contact space magnetic field energy harvesting device for power transmission towers according to claim 4, characterized in that, The sheet-like magnetic focusing component is covered with a covering member to shield and guide the magnetic field around the device.

6. A non-contact space magnetic field energy harvesting device for power transmission towers according to claim 5, characterized in that, The sheet-shaped magnetic core is a disc-shaped or polygonal sheet-shaped magnetic core with a diameter larger than that of the columnar energy harvesting magnetic core.

7. A non-contact space magnetic field energy harvesting device for power transmission towers according to claim 6, characterized in that, It also includes an energy management module. The two terminals of the cylindrical energy harvesting magnetic core are connected to the energy management module via a rectifier and filter circuit. The energy management module includes an impedance matching unit, an energy storage unit, and a voltage regulation output unit.

8. A non-contact space magnetic field energy harvesting device for power transmission towers according to claim 7, characterized in that, The covering structure is made of a high magnetic permeability material or a conductive shielding material, and the outer diameter of the covering structure is equal to the outer diameter of the sheet-like magnetic concentrator.

9. A construction system for a non-contact space magnetic field energy harvesting device for transmission towers, used to perform the construction method of a non-contact space magnetic field energy harvesting device for transmission towers as described in any one of claims 1-3, comprising: The simulation module is configured to build a three-dimensional finite element model that includes a transmission line, a cylindrical energy harvesting core, a sheet-like magnetic focusing component, and a cylindrical covering structure; and to perform multivariate scanning simulation on several set parameters of the three-dimensional finite element model. The output module is configured to take the open-circuit induced voltage in the cylindrical energy harvesting core as the objective function, select the parameter combination that maximizes the objective function or satisfies the preset threshold as the preferred structural parameters, and output the preferred structural parameters to the display terminal.

10. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program, which, when executed by a processor, implements a method for constructing a non-contact space magnetic field energy harvesting device for power transmission towers as described in any one of claims 1-3.

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