A method and system for selecting a position of a power taking device based on a voltage across a ground insulator

Abstract

The application discloses a method and system for selecting the arrangement position of a power-taking device based on the voltage between the two ends of a ground wire insulator, and comprises the following steps: obtaining preliminary influencing factors of power-taking power, and optimizing the preliminary influencing factors to obtain optimized influencing factors; analyzing the influence law of the optimized influencing factors on the power-taking power; constructing a target function based on the obtained influence law and the optimized influencing factors, and obtaining a strain section that can maximize the power-taking power; and selecting the arrangement position of the power-taking device based on the obtained strain section. The method disclosed by the application can quickly find the maximum power-taking position, is time-saving and labor-saving compared with the existing method, and can better utilize the energy of electromagnetic induction on the ground wire according to the power-taking position obtained by the method. The applicability and universality of the method are high, and the method can be applied to power transmission lines of different voltage levels.

Description

Technical Field

[0001] This invention belongs to the field of high voltage technology and relates to a method and system for selecting the location of an energy harvesting device based on the voltage across the two ends of a ground wire insulator. Background Technology

[0002] Online monitoring equipment for power transmission lines, due to its dispersed location on poles or conductors, cannot be directly powered by the power grid or distribution network terminals like other equipment. How to provide stable and effective power to online monitoring equipment on power transmission lines has become one of the important issues in the development of online monitoring technology. Common power supply methods for online monitoring equipment include using small wind turbines, solar cells, erecting dedicated low-voltage power lines, and wireless power supply. However, these methods are affected by factors such as geography, weather, cost, size, output power, and insulation, and cannot adequately meet the power requirements of online monitoring equipment and related communication equipment. To solve the power supply problem for online monitoring equipment, some scholars have proposed using current transformers (CTs) to provide online power based on the phase conductor current. However, this method cannot power equipment at low potentials (such as monitoring devices located on poles or ground wires).

[0003] To prevent transmission lines from being directly struck by lightning, 110kV and above overhead lines are generally equipped with lightning protection wires, i.e., ground wires, along their entire length. Due to the effects of electrostatics and electromagnetic induction, an induced voltage and current stably exist on the ground wire, thus introducing related energy losses. Taking a 1000km 750kV transmission line as an example, the annual energy loss on the ground wire can reach as high as 2×10⁻⁶. 7 kWh. Some scholars have proposed utilizing this energy to power online monitoring equipment, which can be divided into energy harvesting based on electrostatic induction and energy harvesting based on electromagnetic induction. Utilizing ground wire induction provides a new approach to solving the power supply problem for online equipment.

[0004] There are two main methods for energy harvesting based on electromagnetic induction of the ground wire: one is based on the voltage across the ground wire insulator, and the other is based on the induced current and current transformer (CT) of the ground wire. The voltage-based method is primarily used for ground wires with segmented insulation, while the method based on the induced current and CT is primarily used for ground wires grounded to individual towers. Current research on ground wire energy harvesting mainly focuses on calculating the harvested power and designing the harvesting device. Few studies have addressed the impact of different device placements on the harvested power. Calculations have shown that even within a single tension section of a transmission line, the harvested power can vary by several times depending on the placement of the ground wire energy harvesting device. Furthermore, existing methods cannot quickly determine the appropriate ground wire energy harvesting scheme and device placement for different ground wire operating modes, nor can they effectively utilize the energy induced by electromagnetic induction on the ground wire. Summary of the Invention

[0005] The purpose of this invention is to solve the problems in the prior art of lacking a method for selecting the installation location of the ground wire energy harvesting device, making it impossible to quickly find the optimal energy harvesting location when arranging the energy harvesting device, making the selection of the energy harvesting location time-consuming and laborious, and having low utilization rate of electromagnetic induction energy on the ground wire. The invention provides a method and system for selecting the arrangement location of the energy harvesting device based on the voltage across the ground wire insulator.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] A method for selecting the location of an energy harvesting device based on the voltage across a ground wire insulator includes the following steps:

[0008] S1: Obtain the preliminary influencing factors of energy harvesting power, and optimize the preliminary influencing factors to obtain the optimized influencing factors;

[0009] S2: Analyze the influence of optimized factors on energy harvesting power;

[0010] S3: Based on the obtained influence laws and optimized influence factors, construct an objective function to obtain the tension section that maximizes energy extraction power;

[0011] S4: Select the location of the energy harvesting device based on the obtained tension section.

[0012] A further improvement of the present invention is that:

[0013] In step S1, the preliminary influencing factors of the energy harvesting power include:

[0014] The self-impedance of OPGW ground wire and ordinary ground wire, the eddy induced electromotive force on OPGW ground wire and ordinary ground wire, the size of the energy harvesting load, and the size of the tower grounding resistance.

[0015] In step S1, the optimized influencing factors include:

[0016] The tower grounding resistance, the average span of the line in the tension section, the average distance between conductors and ground wires, the average distance between ground wires, and whether the conductors in the tension section have been transposed.

[0017] In step S2, assuming that the number of towers in each tension section of the transmission line is equal, the influence of influencing factors on the energy extraction law is analyzed:

[0018] The energy harvesting power decreases as the tower grounding resistance decreases;

[0019] The magnitude of the energy harvesting power is directly proportional to the change in the average span of the line within the tension section.

[0020] When the average distance between the ground wires increases, the energy harvesting power increases;

[0021] As the average distance between the conductors and ground wires increases, the energy harvesting power decreases.

[0022] When the conductor is transposed within the tension section, the energy harvesting power is reduced.

[0023] In step S3, the objective function constructed is:

[0024]

[0025] Where k is the conductor current coefficient; a is the ground wire radius coefficient; b is the ground wire internal resistance coefficient; R represents the average grounding resistance of the tower; x represents the average span of the line within the tension section; d represents the average distance between ground wires; h represents the average height difference between conductors and ground wires; m represents the conductor-ground wire transposition status within the tension section. If there is no conductor transposition within the tension section, m = 1; if there is conductor transposition, m = 1. Where n is the location of the switching point, and N is the total number of spans within the tension section.

[0026] Step S4 includes the following steps:

[0027] Based on the obtained maximum tension section, the energy harvesting power at different energy harvesting points within the same tension section is simulated and calculated. The final placement position of the energy harvesting device is obtained based on the comparison results of the energy harvesting power.

[0028] The selected energy harvesting device is located at the tower furthest from the segmented insulator.

[0029] A system for selecting the location of an energy harvesting device based on the voltage across a ground wire insulator includes an influencing factor acquisition module, an influencing factor analysis module, an objective function construction module, and a location determination module.

[0030] The influencing factor acquisition module is used to acquire the preliminary influencing factors of energy harvesting power and optimize the preliminary influencing factors to obtain the optimized influencing factors.

[0031] The influencing factor analysis module is used to analyze the impact of optimized influencing factors on energy harvesting power.

[0032] The objective function construction module is used to construct an objective function based on the obtained influence laws and optimized influence factors, in order to obtain the tension section that maximizes the energy harvesting power.

[0033] The placement determination module is used to select the placement location of the energy harvesting device based on the acquired tension section.

[0034] A terminal device includes a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the computer program to implement the steps of any of the methods described in this invention.

[0035] A computer-readable storage medium storing a computer program, characterized in that, when executed by a processor, the computer program implements the steps of any of the methods described in this invention.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] This invention discloses a method for selecting the location of an energy harvesting device based on the voltage across the ground wire insulator. The method optimizes the acquired energy harvesting factors and analyzes these optimized factors to better abstract the relationship between each influencing factor and the energy harvesting power. Based on this, an objective function is constructed to obtain the tension section that maximizes the energy harvesting power. The energy harvesting location is then obtained within this maximum tension section. This method can quickly find the maximum energy harvesting location, saving time and effort compared to existing methods. The energy harvesting location obtained by this method can better utilize the electromagnetic induction energy on the ground wire. This method has high applicability and universality and can be applied to transmission lines of different voltage levels. Attached Figure Description

[0038] 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.

[0039] Figure 1 This is a schematic flowchart of the method of the present invention;

[0040] Figure 2This is a top view schematic diagram of the conventional ground wire segmented insulation and OPGW tower-by-tower grounding of the present invention;

[0041] Figure 3 This is the equivalent circuit diagram of the local wire operation mode of the present invention when the ordinary ground wire is segmented and insulated, and the OPGW ground wire is grounded tower by tower;

[0042] Figure 4 This invention illustrates how the voltage extraction power across the insulator varies with grounding resistance.

[0043] Figure 5 This is a graph showing the variation of the voltage harvesting power across the insulator of the present invention with the span distance;

[0044] Figure 6 This is a graph showing the effect of the distance between ground wires on the energy harvesting power according to the present invention;

[0045] Figure 7 This is a graph showing the effect of the height difference between conductors and ground wires on the energy harvesting power according to the present invention.

[0046] Figure 8 This is a graph showing the variation of energy harvesting power at different energy harvesting points within the same tension section of the present invention. Detailed Implementation

[0047] 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.

[0048] Therefore, the following detailed description of the embodiments of the invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely to illustrate selected embodiments of the invention. All other embodiments obtained by those skilled in the art based on the embodiments of the invention without inventive effort are within the scope of protection of the invention.

[0049] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.

[0050] In the description of the embodiments of the present invention, it should be noted that if terms such as "upper," "lower," "horizontal," or "inner" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship commonly used when the product of the invention is in use, 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 orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, terms such as "first" and "second" are only used to distinguish descriptions and should not be construed as indicating or implying relative importance.

[0051] Furthermore, the use of the term "horizontal" does not imply that the component must be absolutely horizontal, but rather that it can be slightly tilted. For example, "horizontal" simply means that its direction is more horizontal than "vertical," and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0052] In the description of the embodiments of the present invention, it should also be noted that, unless otherwise explicitly specified and limited, the terms "set," "install," "connect," and "link" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the present invention according to the specific circumstances.

[0053] The present invention will now be described in further detail with reference to the accompanying drawings:

[0054] See Figure 1 This invention discloses a method for selecting the location of an energy harvesting device based on the voltage across the ground wire insulator. This method is applied to the device when harvesting energy from the voltage across the ground wire insulator, specifically in the OPGW tower-by-tower grounding operation mode. Figure 2 The energy harvesting load is connected in parallel to both ends of the insulator connecting the segmented insulated ground wire and the tower, thus forming a "segmented insulated ground wire-load-OPGW" loop. The magnetic field generated by the conductor current acts on this loop to induce an eddy current electromotive force, which in turn generates an induced current. The induced current flows through the energy harvesting load to achieve the purpose of energy harvesting.

[0055] The specific implementation steps of this invention include:

[0056] Step 1: Obtain the preliminary influencing factors of energy harvesting power, and optimize the preliminary influencing factors to obtain the optimized influencing factors;

[0057] The basic variables are the factors affecting the power extracted from the ground wire. To determine which factors will affect the power extracted from the ground wire, the equivalent circuit for power extraction based on the voltage across the ground wire insulator should be analyzed based on electromagnetic field theory.

[0058] When the grounding wire operates in a conventional segmented insulation mode, and the OPGW grounding wire is grounded tower by tower, the equivalent circuit is as follows: Figure 3 As shown:

[0059] The energy extraction loop is a loop formed by the ground wires between the i-th tower and the m-th tower. The energy extraction load is installed on the m-th tower. The subscript of the OPGW ground wire is denoted as 1, and the subscript of the ordinary ground wire is denoted as 2. The subscripts i, m, etc. in the figure represent the tower numbers. The i-th section (between the (i-1)-th tower and the i-th tower, denoted as S) i Z i-1(1) E i-1(1) and Z i-1(2) E i-1(2) These represent the self-impedance and eddy-induced electromotive force of the OPGW and ordinary ground wire, respectively; E i-m(1e) E i-m(2e) The corresponding eddy current induced between nodes i and m corresponds to the two ground wires; Z i-m(1e) Z i-m(2e) R represents the self-impedance of the two ground wires between node i and node m, respectively; i Z1 represents the tower grounding resistance, and Z1 represents the energy extraction load.

[0060] According to the equivalent circuit, the initial influencing factors of energy harvesting power include:

[0061] The self-impedance of OPGW ground wire and ordinary ground wire, the eddy induced electromotive force on OPGW ground wire and ordinary ground wire, the size of the energy harvesting load, and the size of the tower grounding resistance.

[0062] Furthermore, based on theoretical analysis, the influencing factors of these factors can be identified, allowing for further refinement of the problem:

[0063] Regarding the self-impedance of the ground wire: The model of the OPGW ground wire and the ordinary ground wire are fixed parameters of the line. For a certain transmission line, the radius and internal resistance of the ground wire are the same. Therefore, the ground wire impedance is only affected by the span of the energy extraction range.

[0064] For the eddy current induced in the ground wire: the power frequency current of the conductor in the same line is equal in magnitude at all locations. Therefore, the factors affecting the eddy current induced in the ground wire include whether the conductor is transposed within the tension section, the average span of the line within the tension section, the average distance between the conductor and the ground wire within the tension section, and the average distance between the conductors within the tension section.

[0065] In summary, the optimized influencing factors, i.e., the basic variables selected for the optimization problem, are:

[0066] The tower grounding resistance, the average span of the line in the tension section, the average distance between conductors and ground wires, the average distance between ground wires, and whether the conductors in the tension section have been transposed.

[0067] Step 2: Analyze the impact of optimized influencing factors on energy harvesting power;

[0068] Within the same tension section, the farther the energy harvesting device is from the single-point grounding point within the tension section, the larger the energy harvesting loop becomes, and the greater the electromagnetic induction in the loop, thus resulting in greater energy harvesting power. Therefore, the difficulty in selecting the location of the energy harvesting device lies in choosing which tension section of the transmission line to harvest energy from. In analyzing the problem, it is assumed that each tension section of the transmission line contains an equal number of towers. The impact of the average line parameters within the tension section on the energy harvesting power is discussed below.

[0069] The impact of the tower grounding resistance on the energy harvesting power:

[0070] The magnitude of the tower grounding resistance affects the energy extraction power by influencing the magnitude of the current flowing into the ground in the circuit. Specific simulation results are as follows: Figure 4 As shown, when the grounding resistance of the tower decreases, the component of the induced current flowing into the ground through the tower will increase, and the induced current flowing through the energy harvesting load will decrease accordingly. Therefore, the energy harvesting power decreases as the grounding resistance decreases.

[0071] The impact of the average span length of the tension section on the energy harvesting power:

[0072] See Figure 5 Based on the variation of the energy harvesting power across the insulator voltage with the span, simulation results show that the energy harvesting power is approximately proportional to the span. This is because, under constant conditions, increasing the span of the energy harvesting section is equivalent to increasing the area of ​​the energy harvesting circuit, resulting in a larger induced voltage under the same magnetic field. However, increasing the span of the energy harvesting circuit also proportionally increases the total internal resistance of the line. But due to the influence of the energy harvesting load and the tower grounding resistance, the total resistance of the energy harvesting circuit does not strictly change linearly with the span. Therefore, the energy harvesting power only exhibits an approximately linear relationship with the span.

[0073] The effect of the average distance between ground wires on the energy harvesting power:

[0074] See Figure 6 When the distance between the phase conductors increases, it is equivalent to increasing the area of ​​the energy extraction circuit. The magnetic field generated by the phase conductors will produce a higher induced voltage in the larger circuit, thus significantly improving the energy extraction power.

[0075] The effect of the average distance between the conductors on the energy harvesting power:

[0076] See Figure 7When the height between the conductor and the ground wire increases, the distance between the energy harvesting circuit and the conductor becomes farther, and the magnetic field acting on the energy harvesting circuit becomes weaker. Therefore, the induced voltage on the circuit decreases and the energy harvesting power decreases.

[0077] The effect of conductor transposition within the tension section on energy harvesting power:

[0078] Conductor transposition also has a significant impact on energy harvesting power. If the conductors in the tension section where the energy harvesting device is located are transposed, the energy harvesting power will drop to about half of that before transposition. Therefore, tension sections where conductor transposition should be avoided as much as possible when arranging energy harvesting devices.

[0079] Step 3: Based on the obtained influence patterns and optimized influencing factors, construct an objective function to obtain the tension section that maximizes energy extraction power.

[0080] Let the average tower grounding resistance be R, the average span be x, the average distance between ground wires be d, and the average height difference between conductors and ground wires be h. Let m represent the conductor-ground wire transposition within the tension section. If there is no conductor transposition within the tension section, m = 1; if there is conductor transposition, m = 1. Where n is the location of the switching point, and N is the total number of spans within the tension section.

[0081] Based on simulation patterns and theoretical analysis, the objective function is obtained as follows:

[0082]

[0083] Where k, a, and b are coefficients related to conductor current, ground wire radius, and ground wire internal resistance, respectively.

[0084] For a given transmission line at a given moment, the conductor current and ground wire parameters along the line remain constant. Therefore, the aforementioned coefficients are constants when analyzing the energy extraction problem. Thus, the problem can be transformed into an optimization problem of finding its maximum value:

[0085]

[0086] The feasible region S of the problem is determined by the actual transmission line conditions, and the values ​​of the basic variables are discrete, so relevant algorithms can be used to solve it quickly.

[0087] Step 4: Select the location of the energy harvesting device based on the obtained tension section.

[0088] According to equivalent circuit and electromagnetic theory, the farther the energy harvesting device is placed from the ground wire segment insulator in the tension section, the larger the effective energy harvesting loop area is. Under other conditions, the magnetic flux of the power frequency magnetic field generated by the power frequency current in the space will be greater, and therefore the electromagnetic induction of the ground wire will be stronger.

[0089] Taking the case where the ground wire segment insulator is located at the midpoint of the tension section as an example, the energy harvesting power at different energy harvesting points within the same tension section is simulated and calculated. Figure 8 As shown in the results, the farther the energy harvesting point is from the segment insulator, the greater the energy harvesting power. Therefore, the optimal energy harvesting point should be selected at the tower location furthest from the segment insulator within the tension section.

[0090] This invention discloses a specific embodiment:

[0091] Assume a 500kV single-circuit transmission line has five tension sections, and each tension section contains 10 spans of line. The average values ​​of relevant parameters for each tension section are shown below:

[0092]

[0093] Substituting the above parameters into the optimization problem, we find that the basic variables corresponding to tension segment number 1 are the optimal solutions, maximizing the objective function value. Using simulation circuits, we calculate the energy harvesting power of the energy harvesting loads arranged at each tension segment. During the calculation, the condition that the energy harvesting loads are located on both sides of the insulator furthest from the grounding point is satisfied. Finally, comparing the calculated energy harvesting power results for each segment, we find that the maximum energy harvesting power is obtained at tension segment number 1. These results demonstrate that the objective function in the optimization algorithm proposed in this invention effectively abstracts the relationship between various influencing factors and energy harvesting power, and also prove the feasibility of the proposed solution.

[0094] Determining the location of maximum energy extraction power using simulation circuits is cumbersome in terms of parameter input during operation and requires sequential calculation of the energy extraction power at each tension section, which is more time-consuming and labor-intensive compared to the method proposed in this invention. Although the method proposed in this invention cannot accurately obtain the energy extraction power value, it can quickly and accurately find the location of maximum energy extraction power, and can be used to guide the placement of ground wire energy extraction devices in actual production. Furthermore, the method proposed in this invention can be extended to transmission lines of different voltage levels, demonstrating universality and applicability.

[0095] This invention also discloses a ground wire-based energy harvesting device placement location selection system, comprising:

[0096] The influencing factor acquisition module is used to acquire the preliminary influencing factors of energy harvesting power and optimize the preliminary influencing factors to obtain the optimized influencing factors.

[0097] The influencing factor analysis module is used to analyze the impact of optimized influencing factors on energy harvesting power.

[0098] The objective function construction module is used to construct an objective function based on the obtained influence laws and optimized influence factors, in order to obtain the tension section that maximizes the energy harvesting power.

[0099] The placement determination module is used to select the placement location of the energy harvesting device based on the acquired tension section.

[0100] A schematic diagram of a terminal device according to an embodiment of the present invention. The terminal device of this embodiment includes: a processor, a memory, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, it implements the steps in the various method embodiments described above. Alternatively, when the processor executes the computer program, it implements the functions of each module / unit in the various device embodiments described above.

[0101] The computer program can be divided into one or more modules / units, which are stored in the memory and executed by the processor to complete the present invention.

[0102] The terminal device may be a desktop computer, laptop, handheld computer, or cloud server, etc. The terminal device may include, but is not limited to, a processor and a memory.

[0103] The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSPs), application-specific integrated circuits (ASICs), field-programmable gate arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc.

[0104] The memory can be used to store the computer program and / or module. The processor implements various functions of the terminal device by running or executing the computer program and / or module stored in the memory and calling the data stored in the memory.

[0105] If the modules / units integrated into the terminal device are implemented as software functional units and sold or used as independent products, they can be stored in a computer-readable storage medium. Based on this understanding, all or part of the processes in the methods of the above embodiments can also be implemented by a computer program instructing related hardware. The computer program can be stored in a computer-readable storage medium, and when executed by a processor, it can implement the steps of the various method embodiments described above. The computer program includes computer program code, which can be in the form of source code, object code, executable files, or certain intermediate forms. The computer-readable medium can include: any entity or device capable of carrying the computer program code, recording media, USB flash drives, portable hard drives, magnetic disks, optical disks, computer memory, read-only memory (ROM), random access memory (RAM), electrical carrier signals, telecommunication signals, and software distribution media, etc. It should be noted that the content included in the computer-readable medium can be appropriately added or removed according to the requirements of legislation and patent practice in the jurisdiction. For example, in some jurisdictions, according to legislation and patent practice, computer-readable media do not include electrical carrier signals and telecommunication signals.

[0106] 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 selecting the location of an energy harvesting device based on the voltage across a ground wire insulator, characterized in that, Includes the following steps: S1: Obtain the preliminary influencing factors of energy harvesting power, and optimize the preliminary influencing factors to obtain the optimized influencing factors; S2: Analyze the influence of optimized factors on energy harvesting power; S3: Based on the obtained influence laws and optimized influence factors, construct an objective function to obtain the tension section that maximizes energy extraction power; S4: Select the location of the energy harvesting device based on the obtained tension section; In step S1, the preliminary influencing factors of the energy harvesting power include: The self-impedance of OPGW ground wire and ordinary ground wire, the eddy induced electromotive force on OPGW ground wire and ordinary ground wire, the size of the energy harvesting load, and the size of the tower grounding resistance; In step S1, the optimized influencing factors include: Tower grounding resistance, average span of line within tension section, average distance between conductor and ground wire, average distance between ground wire, and whether conductors within tension section have been transposed. In step S2, assuming that the number of towers in each tension section of the transmission line is equal, the influence of influencing factors on the energy extraction law is analyzed: The energy harvesting power decreases as the tower grounding resistance decreases; The magnitude of the energy harvesting power is directly proportional to the change in the average span of the line within the tension section. When the average distance between the ground wires increases, the energy harvesting power increases; As the average distance between the conductors and ground wires increases, the energy harvesting power decreases. When the conductor is transposed within the tension section, the energy harvesting power is reduced; In step S3, the objective function constructed is: Where k is the conductor current coefficient; a is the ground wire radius coefficient; b is the ground wire internal resistance coefficient; R represents the average grounding resistance of the tower; x represents the average span of the line within the tension section; d represents the average distance between ground wires; h represents the average height difference between conductors and ground wires; m represents the conductor-ground wire transposition status within the tension section, where m=1 is recorded if there is no conductor transposition and m= , where n is the location of the switching point and N is the total number of spans in the tension section.

2. The method for selecting the location of an energy harvesting device based on the voltage across a ground wire insulator according to claim 1, characterized in that, Step S4 includes the following steps: Based on the obtained maximum tension section, the energy harvesting power at different energy harvesting points within the same tension section is simulated and calculated. The final placement position of the energy harvesting device is obtained based on the comparison results of the energy harvesting power.

3. The method for selecting the location of an energy harvesting device based on the voltage across a ground wire insulator according to claim 2, characterized in that, The selected energy harvesting device is located at the tower furthest from the segmented insulator.

4. A system for selecting the location of an energy harvesting device based on the voltage across a ground wire insulator, implementing the method of claim 1, characterized in that, It includes modules for acquiring influencing factors, analyzing influencing factors, constructing objective functions, and determining placement locations; The influencing factor acquisition module is used to acquire the preliminary influencing factors of energy harvesting power and optimize the preliminary influencing factors to obtain the optimized influencing factors. The influencing factor analysis module is used to analyze the impact of optimized influencing factors on energy harvesting power. The objective function construction module is used to construct an objective function based on the obtained influence laws and optimized influence factors, in order to obtain the tension section that maximizes the energy harvesting power. The placement determination module is used to select the placement location of the energy harvesting device based on the acquired tension section.

5. A terminal device, comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the computer program, it implements the steps of the method as described in any one of claims 1-3.

6. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method as described in any one of claims 1-3.

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