A ground CT power taking optimization method and system based on a discrete optimal solution algorithm

Abstract

The application discloses a ground wire CT power taking optimization method and system based on a discrete optimal solution algorithm, and comprises the following steps: determining base variables affecting power taking under different ground wire operation modes, collecting the obtained base variables under different ground wire operation modes to form a plurality of base variable groups; through equivalent circuits and simulation analysis, simulation tests are performed on the base variable groups and the change law of induced current to obtain test results; corresponding target functions are constructed based on the test results of different base variable groups, and data corresponding to each group of base variables are collected as inputs of the target functions for solving; based on the solving results, a target tension section or a power taking position for installing a power taking device is determined; the adaptability of the base variables to different operation modes is improved, the calculation results of the target functions constructed based on the same are more accurate, accurate power taking positions are provided for different operation modes of the ground wire, the utilization rate of the induced current is improved, and the current loss is reduced; the calculation process disclosed by the application is simple, and the power taking positions under different grounding modes can be quickly obtained based on the method.

Description

TECHNICAL FIELD

[0001] The application belongs to the field of high voltage, and relates to a ground wire CT power taking optimization method and system based on a discrete optimal solution algorithm. BACKGROUND

[0002] The traditional online monitoring device power supply method, including small fan power supply and solar panel power supply, is greatly affected by weather factors, so the power supply power is unstable, and the power supply device is large in size, which is not conducive to the installation and maintenance of equipment, and increases the cost of line operation.

[0003] It is proposed to use the power frequency magnetic field generated by the current on the conductor in space and the current transformer (CT) to take power. There is electromagnetic coupling between the conductor and the ground wire, so there is a stable power frequency induced voltage and induced current on the ground wire generated by the current on the conductor. For the induced current, the ground wire induced current and the CT can be used to take power. When taking power, the difference in power at different positions is large, and if the best power taking position cannot be found, the current will be wasted. The existing method cannot quickly find the best power taking position for different ground wire grounding modes when taking power, which easily causes current waste and cannot meet the power demand of the online monitoring device of the power transmission line. SUMMARY

[0004] The purpose of the application is to solve the problem in the prior art that the best power taking position of the power taking device cannot be determined for different ground wire operation modes, the determination of the power taking position has low adaptability to the ground wire operation mode, and current waste is easily caused. A ground wire CT power taking optimization method and system based on a discrete optimal solution algorithm are provided.

[0005] To achieve the above purpose, the application adopts the following technical solutions:

[0006] A ground wire CT power taking optimization method based on a discrete optimal solution algorithm, comprising the following steps:

[0007] S1: Determine the base variables that affect power taking under different ground wire operation modes, and collect the base variables under different ground wire operation modes to form a plurality of base variable groups;

[0008] S2: Perform simulation tests on the base variable groups and the induced current variation law through equivalent circuits and simulation analysis, and obtain test results;

[0009] S3: Based on the test results of different base variable groups, construct corresponding objective functions, and collect the data corresponding to each group of base variables as the input of the objective functions for solving;

[0010] S4: Based on the solving results, determine the target tension section or power taking position for installing the power taking device;

[0011] S5: When the solution result is the target strain section for installing the power taking device, the power taking position in the target strain section is determined through simulation test.

[0012] Further improvement of the present application is:

[0013] The different ground wire operation modes include:

[0014] Common ground wire section insulation and OPGW tower-by-tower grounding;

[0015] Double OPGW tower-by-tower grounding.

[0016] When the ground wire operation mode is common ground wire section insulation and OPGW tower-by-tower grounding, the basic variables include:

[0017] Tower grounding resistance, whether the conductor in the strain section is transposed, average span of the line in the strain section, average distance between the ground wires in the strain section and average distance between the ground wires in the strain section.

[0018] When the ground wire operation mode is double OPGW tower-by-tower grounding, the basic variables include:

[0019] Height difference between the ground wires at each span and distance between the ground wires at each span.

[0020] When the ground wire operation mode is common ground wire section insulation and OPGW tower-by-tower grounding, the target function constructed is:

[0021]

[0022] Wherein, R represents the average tower grounding resistance; x represents the average line span; d represents the average ground wire-to-ground height; h represents the average height difference between the ground wires;

[0023] m represents the transposition condition of the ground wire in the strain section, m=1 for no conductor transposition in the strain section and m=2 for conductor transposition in the strain section. Wherein, n is the position of the transposition point, and N is the total number of spans in the strain section.

[0024] The formula (1) is optimized:

[0025]

[0026] Wherein, the feasible region S is determined by the actual power transmission line.

[0027] When the ground wire operation mode is double OPGW tower-by-tower grounding, the target function constructed is:

[0028]

[0029] Wherein, d represents the average height of the ground wire to the ground; h represents the average height difference between the ground wires,

[0030] Based on formula (2), the gear with the maximum value is the energy taking position.

[0031] A ground wire CT energy taking optimization system based on a discrete optimal solution algorithm, comprising a basic variable group acquisition module, a test analysis module, a function construction module, a position acquisition module one and a position acquisition module two;

[0032] The basic variable group acquisition module is used for determining the basic variables affecting energy taking under different ground wire operation modes, and the basic variables under different ground wire operation modes are summarized to form a plurality of basic variable groups.

[0033] The test analysis module is used for performing simulation tests on the basic variable groups and the variation law of induced current through equivalent circuits and simulation analysis, and obtaining test results.

[0034] The function construction module is used for constructing corresponding target functions based on the test results of different basic variable groups, and collecting the data corresponding to each group of basic variables as the input of the target functions for solving.

[0035] The position acquisition module one is used for determining the target tension section or the energy taking position where the energy taking device is installed based on the solving results.

[0036] The position acquisition module two is used for determining the energy taking position in the target tension section through simulation tests when the solving result is the target tension section where the energy taking device is installed.

[0037] A terminal device comprises a memory, a processor, and a computer program stored in the memory and executable on the processor, and the processor implements the steps of the method of any one of the present application when executing the computer program.

[0038] A computer readable storage medium stores a computer program, and the computer program is executed by a processor to implement the steps of the method of any one of the present application.

[0039] Compared with the prior art, the present application has the following beneficial effects:

[0040] The present application discloses a ground wire CT energy taking optimization method based on a discrete optimal solution algorithm, different basic variables are collected for different wiring modes of the ground wire, and the basic variables corresponding to each mode are analyzed, which improves the adaptability of the basic variables to different operation modes, the calculation results of the target functions constructed based thereon are more accurate, accurate energy taking positions are provided for different operation modes of the ground wire, the utilization rate of the induced current is improved, and the loss of the current is reduced, the calculation process disclosed by the present application is simple, and the energy taking positions under different grounding modes can be quickly obtained based on the method. Attached Figure Description

[0041] 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.

[0042] Figure 1 This is a schematic diagram of the process of the present invention;

[0043] Figure 2 The diagrams show the energy extraction methods under two ground wire operation modes of the present invention (where a is a diagram of the energy extraction method when the ordinary ground wire is segmented and the OPGW is grounded to each tower, and b is a diagram of the energy extraction method when both OPGWs are grounded to each tower).

[0044] Figure 3 This is an equivalent circuit diagram for calculating the induced current in the ground wire under the ground wire operation mode of ordinary ground wire segmented insulation and OPGW tower-by-tower grounding in this invention;

[0045] Figure 4 This is a graph showing the variation of the energy harvesting power of the present invention with the span distance;

[0046] Figure 5 This is a graph showing the variation of the energy harvesting power of the present invention with grounding resistance;

[0047] Figure 6 The equivalent circuit diagram for calculating the induced current in the ground wire when both OPGWs are grounded to their respective towers is shown in this invention.

[0048] Figure 7 The diagram shows the variation of energy harvesting power with the grounding resistance of the towers when both OPGWs are grounded to each tower according to the present invention.

[0049] Figure 8 The induced current in the ground wire within the tension section of this invention is distributed along the line. Detailed Implementation

[0050] 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.

[0051] 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.

[0052] 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.

[0053] 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.

[0054] 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.

[0055] 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.

[0056] The present invention will now be described in further detail with reference to the accompanying drawings:

[0057] See Figure 1 This invention discloses a ground wire CT energy harvesting optimization method based on a discrete optimal solution algorithm. Different objective functions are constructed and calculated based on different ground wire grounding methods to determine the energy harvesting location in different grounding methods.

[0058] In the aforementioned grounding methods, OPGW generally adopts a tower-by-tower grounding operation mode, which allows the lightning current to quickly enter the ground through the tower when the ground wire is struck by lightning. In order to reduce the loss caused by electromagnetic induction on the ground wire, ordinary ground wires generally adopt a segmented insulation operation mode. However, due to the influence of electrostatic induction, if the entire line is segmented and insulated, there will be an electrostatic induction voltage of up to several thousand volts on the ordinary ground wire. Therefore, the ordinary ground wire will select a single-point grounding at a certain point in the line to reduce the electrostatic induction voltage to 0.

[0059] The ground CT energy harvesting optimization method disclosed in this invention includes the following steps:

[0060] Step 1: Determine the basic variables that affect the acquisition of induced current under different ground wire operating modes, and summarize the basic variables under different ground wire operating modes to form several basic variable groups;

[0061] The method disclosed in this invention can be applied to the two grounding operation modes mentioned above, namely:

[0062] (1) Ordinary ground wire segmented insulation and OPGW tower-by-tower grounding;

[0063] (2) Both OPGWs are grounded on a tower-by-tower basis;

[0064] Energy is extracted using electromagnetic induction current from the ground wire through magnetic circuit coupling. This method does not involve modifying the ground wire structure and does not affect the original lightning protection and shielding functions of the ground wire. Because the current transformer (CT) and the ground wire are not in direct contact, the energy extraction device is less affected by the lightning current and overvoltage on the ground wire when it is struck by lightning. Two methods for energy extraction using electromagnetic induction from the ground wire are described below for different ground wire operating modes. Figure 2 a- Figure 2 b

[0065] Furthermore, in this embodiment of the invention, when the ground wire operates in a mode of segmented insulation of ordinary ground wire and tower-by-tower grounding of OPGW, the basic variables affecting the acquisition of induced current are:

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

[0067] Furthermore, in this embodiment of the invention, when the local line operates in a dual OPGW configuration with each tower grounded, the basic variables affecting the acquisition of the induced current are:

[0068] The height difference between each conductor and the distance between each ground wire.

[0069] Step 2: Through equivalent circuit and simulation analysis, conduct simulation experiments on the variation law of each basic variable group and the induced current, and obtain the experimental results;

[0070] When using a CT to harvest energy, the energy source is the power frequency magnetic field generated in space by the induced current in the ground wire.

[0071] After installing a current transformer (CT) on the ground wire, the load impedance brought by the CT is much smaller than the self-impedance along the ground wire. Therefore, the influence of the CT on the induced current on the ground wire can be ignored, and the induced current on the ground wire can be considered to remain approximately constant. After installing the CT on the ground wire, the CT and the ground wire together form a transformer with a primary side of 1 turn. The specific relationship between the extracted power and the induced current on the ground wire is as follows:

[0072]

[0073] Where ω = 2πf, f is the power frequency of 50Hz, Lm is the inductance of the power harvesting CT, and for a fixed power harvesting CT, the inductance is a constant. Ig is the magnitude of the induced current on the ground wire. Therefore, the maximum power harvesting can be obtained by placing the power harvesting device at the location with the largest induced current on the ground wire.

[0074] Furthermore, in this embodiment of the invention, the ground wire operation mode is ordinary ground wire segmented insulation and OPGW tower-by-tower grounding, and the basic variables are analyzed:

[0075] The operation mode of ordinary ground wire segmented insulation and OPGW tower-by-tower grounding, the energy harvesting CT is installed on OPGW. The spatial magnetic field generated by the power frequency current in the phase line acts on the "ground-OPGW-ground" loop to generate an induced electromotive force and then an induced current. The induced current then generates a magnetic field in the surrounding space, and the CT can be used to harvest energy.

[0076] Under the grounding operation mode of segmented insulation of ordinary grounding wires and tower-by-tower grounding of OPGW, the equivalent current used to calculate the induced current in the grounding wire is as follows: Figure 3 As shown in the figure, Eg2 represents the induced voltage generated by the conductor on the OPGW ground wire, Zg2 represents the internal impedance of the OPGW ground wire, and R represents the grounding resistance of the tower. These three factors affect the magnitude of the induced current on the ground wire. Furthermore, regarding the induced voltage on the OPGW: the power frequency current of the conductor on the same line is equal in magnitude at all locations. Therefore, for different tension sections, the factors affecting the energy extraction power include: tower grounding resistance, line span, tower structure, and whether the conductor within the tension section has been transposed.

[0077] Furthermore, an analysis was conducted to determine whether the conductors within the tension section had been transposed.

[0078] If the conductors in the tension section where the energy harvesting device is located are transposed in the middle of the tension section, the electromagnetic induction current generated by the conductors before and after the transposition will cancel each other out, and the ground wire induced current will drop to about half of that before the transposition. Therefore, tension sections where conductors are transposed should be avoided as much as possible when arranging the energy harvesting device.

[0079] Furthermore, the structure of the tower within the tension section is analyzed:

[0080] Based on electromagnetic field calculations and analysis, two parts of the tower structure can affect the induced current in the ground wire and thus the energy harvesting power. These two parts are the height of the ground wire above the ground and the distance between the conductors and the ground wire.

[0081] The distance between conductors and ground wires is mainly determined by the height difference between them. Taking a single-circuit transmission line as an example, its specific expression is shown in formula (4). Based on formula (4), the energy extraction power is proportional to the square of the logarithm of the ground wire height and inversely proportional to the square of the logarithm of the height difference between the conductors and ground wires.

[0082]

[0083] Among them I g Let f be the induced current on the ground wire, and f be the frequency of the conductor current. a I b I c D represents the current in the three-phase conductors. g d is the mirror height of OPGW. ag d bg d cg These represent the distances between the OPGW and the three-phase conductors, respectively.

[0084] Furthermore, the average span of the line within the tension section is analyzed:

[0085] The longer the span, the larger the area of ​​the energy harvesting loop. Therefore, the induced electromotive force on the ground wire is proportional to the span, and the energy harvesting power varies with the span as follows: Figure 4 As shown. Since the internal resistance in the circuit is mainly determined by the grounding resistance of the tower, the induced current in the ground wire increases approximately linearly with the span, and thus the energy extraction power is proportional to the square of the span.

[0086] Furthermore, the grounding resistance of the tower is analyzed:

[0087] The variation of energy harvesting power with tower grounding resistance is as follows: Figure 5 As shown, when other conditions are constant, the greater the grounding resistance of the tower, the smaller the current in the circuit, and therefore the smaller the energy extraction power. The energy extraction power is approximately inversely proportional to the square of the tower's grounding resistance.

[0088] Furthermore, in this embodiment of the invention, the local grounding mode is that both OPGWs are grounded tower by tower, and the basic variables are analyzed:

[0089] In this ground wire operation mode, compared with the aforementioned ground wire operation mode, the energy extraction circuit changes from "tower-OPGW ground wire-tower-earth" to "OPGW ground wire 1-OPGW ground wire 2". Therefore, when finding the optimal energy extraction point, each transmission line segment must be analyzed and evaluated.

[0090] The magnitude of the extracted power is determined by the magnitude of the induced current on the ground wire. When both OPGWs are grounded at each tower, the equivalent circuit for calculating the induced current on the ground wire is as follows: Figure 6 As shown:

[0091] E g1 E g2 Z represents the induced electromotive force generated by the phase conductor on the two ground wires. g1 and Z g2 These are the self-impedances of the two ground wires, and R is the grounding resistance of the corresponding tower. According to the circuit topology, it is easy to see that when calculating electromagnetic induction based on the secondary ground wire operation mode, the ground wire induced current on a certain span of the tension section is basically unaffected by other spans in the same tension section. Therefore, there is no need to consider the situation of conductor transposition in the tension section.

[0092] Regarding the tower grounding resistance: When both OPGWs are grounded tower by tower, because the tower grounding resistance is much greater than the internal resistance of the ground wire, the main loop of the induced current is through the two ground wires, and the component entering the ground is very small. Therefore, when the grounding resistance changes, the induced current in the loop formed by the two OPGW ground wires remains basically unchanged, so the extracted power basically does not change. The specific results obtained through simulation are as follows: Figure 7 As shown, the tower grounding resistance is not considered a fundamental variable affecting energy extraction efficiency when both OPGWs are grounded to each tower.

[0093] Based on this, when the local grounding operation mode is dual OPGW with each tower grounded, the basic variables affecting the energy extraction power are: the height difference between the conductors and grounding wires of each span and the distance between the grounding wires of each span.

[0094] Furthermore, the influence of the height difference between each conductor and the distance between each ground wire on the energy extraction power is the same as the analysis law of the tower structure when ordinary ground wire is segmented insulated and OPGW is grounded tower by tower.

[0095] Step 3: Construct the corresponding objective function based on the experimental results of different basic variable groups, and collect the data corresponding to each group of basic variables as the input of the objective function for solving;

[0096] The local grounding operation mode is ordinary grounding wire segmented insulation and OPGW tower-by-tower grounding. The objective function is constructed as follows:

[0097] In actual operation, the average values ​​of the above parameters are different in each tension section. Applying theory or simulation calculations to find the optimal energy extraction location is inefficient. Instead, we can use the relevant knowledge of optimization theory, take the magnitude of the ground wire induced current as the objective function, and take the above influencing factors as variables. When the variables are within a certain range, we can find the optimal solution.

[0098] Let the average tower grounding resistance be R, the average span be x, the average ground wire height to ground 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. Based on simulation patterns and theoretical analysis, the objective function can be written as:

[0099]

[0100] Therefore, the problem can be transformed into an optimization problem of finding the maximum value:

[0101] maxI(x i ,h i ,d i ,R i ,m i (2)

[0102] st(x i ,h i ,d i ,R i ,m i )∈S, S=(x,h,d,R,m)

[0103] The feasible region S of the problem is determined by the actual transmission line conditions. The constraints of the above optimization problem are extremely simple, and the values ​​of the basic variables are discrete, so relevant algorithms can be used to solve it quickly.

[0104] The local grounding operation mode is dual OPGW, with each tower grounded sequentially. The objective function is constructed as follows:

[0105] In the grounding operation mode where both OPGWs are grounded to each tower, since the grounding resistance is much greater than the internal resistance of the ground wire, the induced current loop is mainly composed of the two OPGWs between the two towers. The resistance in the loop is the internal resistance of the two ground wires. Increasing the line span proportionally increases the induced electromotive force and internal resistance in the loop. Therefore, the induced current on the ground wire is approximately unchanged (in reality, the induced current on the ground wire will increase slightly with the increase of the span).

[0106] Based on this, the main factors affecting the induced current in the ground wire include the height difference between the conductors and the distance between the ground wires. These two factors influence the magnitude of the harvested power by affecting the vector difference of the induced electromotive force between the two OPGW ground wires. An objective function is then constructed as follows:

[0107]

[0108] At this point, we only need to find what makes Energy can be extracted from the highest value setting.

[0109] Step 4: Based on the solution results, determine the energy harvesting location for the energy harvesting device;

[0110] Assuming the parameters of the line within the same tension section are similar, and the ordinary ground wire is grounded at a certain point within the tension section, an analysis of the energy extraction power is performed using a tension section containing 10 spans. Within the same tension section, the distribution of the ground wire induced current along the line is as follows: Figure 8 As shown in the figure, the results indicate that the maximum energy harvesting power can be obtained when the energy harvesting device is located in the middle of the tension section. The obtained energy harvesting power is approximately six times that at the point of minimum current.

[0111] When using a CT to harvest energy, the energy source is the power frequency magnetic field generated in space by the induced current in the ground wire.

[0112] After installing a current transformer (CT) on the ground wire, the load impedance brought by the CT is much smaller than the self-impedance along the ground wire. Therefore, the influence of the CT on the induced current on the ground wire can be ignored, and the induced current on the ground wire can be considered to remain approximately constant. With the CT installed on the ground wire, the CT and the ground wire together form a transformer with a 1-turn primary winding. The specific relationship between the extracted power and the induced current on the ground wire under this energy extraction method is as follows:

[0113]

[0114] Where ω = 2πf, f is the power frequency of 50Hz, Lm is the inductance of the power harvesting CT, and for a fixed power harvesting CT, the inductance is a constant. Ig is the magnitude of the induced current on the ground wire. Therefore, the maximum power harvesting can be obtained by placing the power harvesting device at the location with the largest induced current on the ground wire.

[0115] This invention discloses a specific embodiment:

[0116] When both OPGWs are grounded on each tower, the selection of the energy harvesting device's location is relatively simple. However, when the OPGWs are grounded on each tower and the ordinary ground wires are insulated in sections, the selection of the energy harvesting device's location becomes more complex. The following explanation uses a specific case as an example.

[0117] 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:

[0118]

[0119] 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 CTs deployed at each tension segment, ensuring the CTs are located in the middle of the segment. Comparing the calculated energy harvesting power for each segment, we find that the maximum energy harvesting power is obtained at the middle position of tension segment number 1. These results demonstrate that the objective function in the proposed optimization algorithm effectively abstracts the relationship between various influencing factors and energy harvesting power, and also prove the feasibility of the proposed solution.

[0120] This invention discloses a ground wire CT energy harvesting optimization system based on a discrete optimal solution algorithm, including a basic variable set acquisition module, an experimental analysis module, a function construction module, a location acquisition module one, and a location acquisition module two;

[0121] The basic variable set acquisition module is used to determine the basic variables that affect energy harvesting under different ground wire operating modes, and to summarize the acquired basic variables under different ground wire operating modes to form several basic variable sets.

[0122] The experimental analysis module is used to conduct simulation experiments on the variation law of each basic variable group and the induced current through equivalent circuit and simulation analysis, and obtain experimental results;

[0123] The function construction module is used to construct corresponding objective functions based on the experimental results of different basic variable groups, and to collect the data corresponding to each basic variable group as input to the objective function for solving;

[0124] Location acquisition module one is used to determine the target tension section or energy harvesting location for the energy harvesting device based on the solution results;

[0125] The second location acquisition module is used to determine the energy harvesting location within the target tension section through simulation experiments when the solution result indicates that the energy harvesting device is to be installed in the target tension section.

[0126] 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.

[0127] 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.

[0128] 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.

[0129] 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.

[0130] 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.

[0131] 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.

[0132] 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 ground CT energy harvesting optimization method based on discrete optimal solution algorithm, characterized in that, Includes the following steps: S1: Determine the basic variables that affect energy harvesting under different ground wire operating modes, and summarize the basic variables obtained under different ground wire operating modes to form several basic variable groups; S2: Through equivalent circuit and simulation analysis, simulation experiments are conducted on the variation law of each basic variable group and the induced current to obtain the experimental results; S3: Construct the corresponding objective function based on the experimental results of different basic variable groups, and collect the data corresponding to each group of basic variables as the input of the objective function for solving; S4: Based on the solution results, determine the target tension section or energy harvesting location for the energy harvesting device; S5: When the solution result determines the target tension section where the energy harvesting device is installed, the energy harvesting location within the target tension section is determined through simulation experiments. The different ground wire operating modes include: Ordinary ground wire segmented insulation and OPGW tower-by-tower grounding; Both OPGWs are grounded on a tower-by-tower basis; When the grounding wire operates under the conditions of segmented insulation of ordinary grounding wire and tower-by-tower grounding of OPGW, the basic variables include: Tower grounding resistance, whether conductors in the tension section have been transposed, average span of the line in the tension section, average distance between conductors and ground wires in the tension section, and average distance between conductors in the tension section. When the local line operates in a dual OPGW configuration with each tower grounded individually, the basic variables include: The height difference between each conductor and the distance between each ground wire; When the grounding method of the local ground wire is either ordinary ground wire segmented insulation or OPGW tower-by-tower grounding, the objective function is constructed as follows: Where R represents the average tower grounding resistance; x represents the average line span; d represents the average ground wire height to the ground; and h represents the average height difference between conductors and ground wires. m represents the conductor transposition status within the tension section. No conductor transposition is recorded as m=1, and conductor transposition is recorded as m= Where n is the location of the switching point and N is the total number of spans in the tension section; When the grounding method of the local wire is dual OPGW grounding on each tower, the objective function is constructed as follows: Where d represents the average height of the ground wire above the ground; h represents the average height difference between the conductors. Based on formula (2), the position with the largest value is the energy extraction position.

2. The method for optimizing ground line CT energy harvesting based on discrete optimal solution algorithm according to claim 1, characterized in that, Optimize formula (1): The feasible region S is determined by the actual conditions of the transmission line.

3. A ground CT energy harvesting optimization system based on a discrete optimal solution algorithm, characterized in that, It includes a basic variable set acquisition module, an experimental analysis module, a function construction module, a location acquisition module one, and a location acquisition module two; The basic variable set acquisition module is used to determine the basic variables that affect energy harvesting under different ground wire operating modes, and to summarize the acquired basic variables under different ground wire operating modes to form several basic variable sets. The experimental analysis module is used to conduct simulation experiments on the variation law of each basic variable group and the induced current through equivalent circuit and simulation analysis, and obtain experimental results; The function construction module is used to construct corresponding objective functions based on the experimental results of different basic variable groups, and to collect the data corresponding to each basic variable group as input to the objective function for solving; Location acquisition module one is used to determine the target tension section or energy harvesting location for the energy harvesting device based on the solution results; Location acquisition module 2 is used to determine the energy harvesting location within the target tension section through simulation experiments when the solution result determines the target tension section where the energy harvesting device is installed. The different ground wire operating modes include: Ordinary ground wire segmented insulation and OPGW tower-by-tower grounding; Both OPGWs are grounded on a tower-by-tower basis; When the grounding wire operates under the conditions of segmented insulation of ordinary grounding wire and tower-by-tower grounding of OPGW, the basic variables include: Tower grounding resistance, whether conductors in the tension section have been transposed, average span of the line in the tension section, average distance between conductors and ground wires in the tension section, and average distance between conductors in the tension section. When the local line operates in a dual OPGW configuration with each tower grounded individually, the basic variables include: The height difference between each conductor and the distance between each ground wire; When the grounding method of the local ground wire is either ordinary ground wire segmented insulation or OPGW tower-by-tower grounding, the objective function is constructed as follows: Where R represents the average tower grounding resistance; x represents the average line span; d represents the average ground wire height to the ground; and h represents the average height difference between conductors and ground wires. m represents the conductor transposition status within the tension section. No conductor transposition is recorded as m=1, and conductor transposition is recorded as m= Where n is the location of the switching point and N is the total number of spans in the tension section; When the grounding method of the local wire is dual OPGW grounding on each tower, the objective function is constructed as follows: Where d represents the average height of the ground wire above the ground; h represents the average height difference between the conductors. Based on formula (2), the position with the largest value is the energy extraction position.

4. 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 1-2.

5. 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 1-2.

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