A method, device and system for controlling the uniformity of temperature rise of a vertical ground electrode

Abstract

The application discloses a vertical ground electrode temperature rise uniformization control method, device and system, and belongs to the technical field of vertical ground electrode temperature rise distribution research. The vertical ground electrode temperature rise uniformization control method is: temperature rise data and environment data of a feeding rod are acquired, and a temperature rise mathematical model is constructed; a temperature rise uniformization coefficient is obtained according to the temperature rise mathematical model and coke filling diameter data, and the temperature rise uniformization degree of the vertical ground electrode is measured through the temperature rise uniformization coefficient. The temperature rise mathematical model constructed and the temperature rise uniformization coefficient obtained take the feeding rod data of the vertical ground electrode and the environment data of the feeding rod as the benchmark, reduce the interference of other unnecessary data, improve the accuracy of the temperature rise mathematical model, and further improve the accuracy of the temperature rise uniformization coefficient, so that the temperature rise uniformization control of the vertical ground electrode is more accurate, the service life of the feeding rod at the bottom is prevented from being damaged due to excessive temperature rise, and the power-on stability of the vertical ground electrode is improved.

Description

Technical Field

[0001] This invention relates to the field of vertical grounding electrode temperature rise distribution research technology, and in particular to a method, device and system for controlling the uniformity of temperature rise of vertical grounding electrodes. Background Technology

[0002] With rapid economic development and increasingly scarce land resources, traditional horizontal grounding electrodes, which occupy a large area, no longer meet current development trends. Vertical grounding electrodes, on the other hand, consist of multiple vertical electrode feed rods buried deep underground, allowing high-current DC flow to propagate deep underground. They occupy a relatively small area and have relatively better surface electrical parameters and impact on the surrounding environment, thus finding application in current DC projects. DC grounding electrodes are essential facilities for ultra-high voltage DC transmission systems. To improve system reliability, they must withstand the impact of high-current DC flows during monopolar operation.

[0003] Currently, research on grounding electrode temperature rise mainly focuses on transient modeling and testing of horizontal grounding electrode temperature rise, and experimental analysis and results analysis of vertical grounding electrode temperature rise. No research has been conducted on temperature rise control and distribution uniformity. However, because the feed bar of a vertical grounding electrode points vertically downwards, the temperature rise at the bottom of the feed bar is relatively large due to the end effect of current density, which will severely damage the service life of the feed bar in the long run. Therefore, a new control method or system is urgently needed to address the shortcomings of existing technologies. Summary of the Invention

[0004] This invention provides a method and system for controlling the temperature rise uniformity of vertical grounding electrodes, in order to solve the technical problem of how to more accurately control the temperature rise uniformity of vertical grounding electrodes, thereby avoiding damage to the service life of the bottom of the feeder rod due to excessive temperature rise.

[0005] To address the aforementioned technical problems, embodiments of the present invention provide a method for controlling the uniformity of temperature rise in a vertical grounding electrode, comprising:

[0006] When the temperature of the feed rod of the vertical grounding electrode changes, acquire the temperature rise data of the feed rod and environmental data;

[0007] Based on the temperature rise data of the feed rod and environmental data, and combined with the particle swarm optimization algorithm, an optimal temperature rise mathematical model is constructed.

[0008] The coke filling diameter of the feed rod is updated iteratively, and the temperature rise uniformity coefficient of the current iteration is calculated based on the coke filling diameter of the current iteration and the optimal temperature rise mathematical model, until the temperature rise uniformity coefficient meets the preset requirements.

[0009] The temperature rise uniformity of the vertical grounding electrode is controlled based on the coke filling diameter of the feed rod output by the iteration.

[0010] Understandably, compared to existing technologies, this invention acquires temperature rise data and environmental data of the feeder rod in the vertical grounding electrode and constructs a temperature rise mathematical model based on this data. This constructed temperature rise mathematical model, using the feeder rod data and environmental data of the vertical grounding electrode as a benchmark, reduces interference from other unnecessary data, improves the accuracy of the temperature rise mathematical model, and consequently improves the accuracy of the subsequent temperature rise uniformity coefficient. The temperature rise uniformity coefficient is calculated based on the temperature rise mathematical model and the coke filling diameter data of the feeder rod. This coefficient is used to measure the uniformity of the vertical grounding electrode, making the temperature rise uniformity control of the vertical grounding electrode more accurate. This prevents damage to the service life of the feeder rod bottom due to excessive temperature rise, thereby improving the energizing stability of the vertical grounding electrode.

[0011] As a preferred embodiment, when the temperature of the feed rod of the vertical grounding electrode changes, the temperature rise data and environmental data of the feed rod are obtained, specifically as follows:

[0012] When the temperature of the feed rod of the vertical grounding electrode changes, the ambient temperature data of the feed rod and the temperature rise value of each sub-segment are recorded to obtain the temperature rise data of each sub-segment of the feed rod; wherein, each sub-segment of the feed rod includes: upper sub-segment, middle sub-segment and lower sub-segment of the feed rod;

[0013] When the temperature of the feed rod remains constant, the final temperature rise time and final temperature rise value of the feed rod are obtained; the final temperature rise time, final temperature rise value and temperature rise data of the feed rod segment are processed to obtain the temperature rise data of the feed rod.

[0014] Soil data of the power supply rod is obtained, and combined with the ambient temperature data of the power supply rod, the environmental data of the power supply rod is obtained.

[0015] By collecting and organizing the temperature rise data of the feed rod, we can obtain the temperature rise value and temperature rise time of the feed rod, which provides a data foundation for constructing a temperature rise mathematical model and solving the temperature rise uniformity coefficient.

[0016] As a preferred embodiment, the optimal temperature rise mathematical model is constructed based on the temperature rise data of the feed rod and environmental data, combined with the particle swarm optimization algorithm, specifically as follows:

[0017] Obtain the preset temperature-time coefficient, and combine it with the temperature rise data of the feed rod and environmental data to construct an initial temperature rise mathematical model:

[0018]

[0019]

[0020] Among them, y (t) Let ε be the mathematical model function for temperature rise, t represent different time points during the temperature rise process, and ε be the temperature rise rate. (c)ε represents the final temperature rise of the feed rod. (o) The ambient temperature before the DC current is input to the feed rod is given by: e is an exponential function, k is the temperature rise coefficient, λ is the temperature-time coefficient, C is the soil heat capacity coefficient, δ is the soil thermal conductivity, and R... e ρ is the grounding resistance of a single vertical grounding electrode, A is the surface area of ​​the vertical grounding electrode filled with coke, and ρ is the soil resistivity.

[0021] Based on the preset initial temperature rise change coefficient k ′ By combining the particle swarm optimization algorithm, the initial particle positions and particle counts are obtained, and the objective function for particle swarm optimization is constructed:

[0022]

[0023] Where F(k) is the objective function of particle swarm optimization, y(t) is the actual measured temperature rise data, y(t) is the simulated value of the temperature rise mathematical model, and N is the number of particles in the swarm.

[0024] The objective function for particle swarm optimization is iteratively updated based on the preset initial particle velocity and maximum number of iterations.

[0025] When the preset maximum number of iterations is reached, the iterative update of the objective function for particle swarm optimization is stopped, and the optimal temperature change coefficient k″ is obtained.

[0026] Based on the optimal temperature change coefficient k″, the parameters of the initial temperature rise mathematical model are optimized to obtain the optimal temperature rise mathematical model:

[0027]

[0028] Among them, y (t) Let ε be the mathematical model function for temperature rise, t represent different time points during the temperature rise process, and ε be the temperature rise rate. (c) ε represents the final temperature rise of the feed rod. (o) The ambient temperature before the DC current is input to the feed rod is given by: e is an exponential function, k″ is the optimal temperature rise coefficient, λ is the temperature-time coefficient, C is the soil heat capacity coefficient, δ is the soil thermal conductivity, and R... e Let A be the grounding resistance of a single vertical grounding electrode, A be the surface area of ​​the vertical grounding electrode filled with coke, and ρ be the soil resistivity.

[0029] By constructing a temperature rise mathematical model and combining it with the particle swarm optimization algorithm to construct the objective function of particle swarm optimization, the optimal temperature change coefficient is obtained, thus obtaining the optimal temperature rise mathematical model. This makes the solution for the temperature rise uniformity of the feed rod more accurate and in line with reality.

[0030] As a preferred embodiment, the iterative update of the coke filling diameter of the feed rod, and the calculation of the temperature rise homogenization coefficient for the current iteration based on the current coke filling diameter and the optimal temperature rise mathematical model, until the temperature rise homogenization coefficient meets the preset requirements, specifically:

[0031] Obtain the coke filling diameter corresponding to the upper, middle and lower sub-segments of the feed rod, and calculate the surface area of ​​the coke filling corresponding to the upper, middle and lower sub-segments of the feed rod;

[0032] To obtain the optimal temperature rise mathematical model, and combining it with the surface area of ​​the coke filling the upper, middle, and lower segments of the feed rod, we obtain the temperature rise mathematical models for the upper, middle, and lower segments of the feed rod:

[0033]

[0034]

[0035]

[0036] in, and These represent the mathematical models of temperature rise for the upper, middle, and lower segments of the feed rod, respectively, where t represents different time points during the temperature rise process, and ε represents the temperature rise coefficient. (c) ε represents the final temperature rise of the feed rod. (o) The ambient temperature before the DC current is input to the feed bar, e is an exponential function, k″ is the optimal temperature rise coefficient, and λ a , λ b and λ c These represent the temperature-time coefficients for the upper, middle, and lower segments of the feed rod, respectively; C is the soil's heat capacity coefficient; δ is the soil's thermal conductivity; and R... e ρ is the grounding resistance of a single vertical grounding electrode, A is the surface area of ​​the vertical grounding electrode filled with coke, and ρ is the soil resistivity.

[0037] Obtain the final temperature rise time from the temperature rise data of the feed rod, combine it with the temperature rise mathematical models corresponding to the upper, middle and lower segments of the feed rod, calculate the temperature rise uniformity coefficient of the feed rod, confirm that the temperature rise uniformity coefficient meets the preset requirements, and complete the iterative update:

[0038]

[0039] Where D is the temperature rise uniformity coefficient of the feed rod, and T1 is the final temperature rise time in the temperature rise data of the feed rod. and These represent the mathematical models for the temperature rise of the upper, middle, and lower segments of the feed rod, respectively.

[0040] By obtaining the coke filling diameter of the feed rod, and solving the temperature rise uniformity coefficient of the feed rod according to the temperature rise mathematical model of the feed rod, the temperature rise uniformity of the vertical grounding electrode can be expressed in a more intuitive and accurate way.

[0041] As a preferred embodiment, confirming that the temperature rise uniformity coefficient meets the preset requirements and completing the iterative update specifically involves:

[0042] Obtain the preset temperature rise uniformity range of the vertical grounding electrode. When the temperature rise uniformity coefficient of the feed rod is not within the preset temperature rise uniformity range of the vertical grounding electrode, iteratively update the coke filling diameter corresponding to the upper, middle and lower sub-segments of the feed rod.

[0043] Record the temperature rise data of the feed rod corresponding to the coke filling diameter in the current iteration; calculate and update the temperature rise uniformity coefficient of the feed rod;

[0044] When the temperature rise uniformity coefficient of the feed rod is within the preset temperature rise uniformity range of the vertical grounding electrode, the iterative update is completed, and the coke filling diameter of the current iteration is output.

[0045] By continuously updating the coke filling diameter of the feed rod until the temperature rise uniformity coefficient of the feed rod meets the preset requirements, uniform control of the vertical grounding electrode is achieved.

[0046] Accordingly, this invention provides a vertical grounding electrode temperature rise uniformity control device, including: a feed rod data acquisition module, a temperature rise mathematical model construction module, a temperature rise uniformity coefficient iteration module, and a temperature rise uniformity control module;

[0047] The feed rod data acquisition module is used to acquire temperature rise data and environmental data of the feed rod when the temperature of the feed rod of the vertical grounding electrode changes.

[0048] The temperature rise mathematical model construction module is used to construct the optimal temperature rise mathematical model based on the temperature rise data of the feed rod and environmental data, combined with the particle swarm algorithm.

[0049] The temperature rise uniformity coefficient iteration module is used to iteratively update the coke filling diameter of the feed rod, and calculate the temperature rise uniformity coefficient of the current iteration based on the coke filling diameter of the current iteration and the optimal temperature rise mathematical model, until the temperature rise uniformity coefficient meets the preset requirements.

[0050] The temperature rise uniformity control module is used to control the temperature rise uniformity of the vertical grounding electrode based on the coke filling diameter of the feed rod output by the iterative output.

[0051] As a preferred embodiment, the feed rod data acquisition module includes: a feed rod data acquisition unit;

[0052] The feed bar data acquisition unit is used to record the ambient temperature data and the temperature rise value of each sub-segment of the feed bar when the temperature of the feed bar of the vertical grounding electrode changes, so as to obtain the temperature rise data of each sub-segment of the feed bar; wherein, each sub-segment of the feed bar includes: upper sub-segment, middle sub-segment and lower sub-segment of the feed bar;

[0053] When the temperature of the feed rod remains constant, the final temperature rise time and final temperature rise value of the feed rod are obtained; the final temperature rise time, final temperature rise value and temperature rise data of the feed rod segment are processed to obtain the temperature rise data of the feed rod.

[0054] Soil data of the power supply rod is obtained, and combined with the ambient temperature data of the power supply rod, the environmental data of the power supply rod is obtained.

[0055] As a preferred embodiment, the temperature rise mathematical model construction module includes: a temperature rise mathematical model construction unit;

[0056] The temperature rise mathematical model building unit is used to obtain a preset temperature-time coefficient and, combined with the temperature rise data of the feed rod and environmental data, construct an initial temperature rise mathematical model:

[0057]

[0058]

[0059] Among them, y (t) Let ε be the mathematical model function for temperature rise, t represent different time points during the temperature rise process, and ε be the temperature rise rate. (c) ε represents the final temperature rise of the feed rod. (o) The ambient temperature before the DC current is input to the feed rod is given by: e is an exponential function, k is the temperature rise coefficient, λ is the temperature-time coefficient, C is the soil heat capacity coefficient, δ is the soil thermal conductivity, and R... e ρ is the grounding resistance of a single vertical grounding electrode, A is the surface area of ​​the vertical grounding electrode filled with coke, and ρ is the soil resistivity.

[0060] Based on the preset initial temperature rise change coefficient k ′ By combining the particle swarm optimization algorithm, the initial particle positions and particle counts are obtained, and the objective function for particle swarm optimization is constructed:

[0061]

[0062] Where F(k) is the objective function of particle swarm optimization, Y(t) is the actual measured temperature rise data, y(t) is the simulated value of the temperature rise mathematical model, and N is the number of particles in the swarm.

[0063] The objective function for particle swarm optimization is iteratively updated based on the preset initial particle velocity and maximum number of iterations.

[0064] When the preset maximum number of iterations is reached, the iterative update of the objective function for particle swarm optimization is stopped, and the optimal temperature change coefficient k″ is obtained.

[0065] Based on the optimal temperature change coefficient k″, the parameters of the initial temperature rise mathematical model are optimized to obtain the optimal temperature rise mathematical model:

[0066]

[0067] Among them, y (t) Let ε be the mathematical model function for temperature rise, t represent different time points during the temperature rise process, and ε be the temperature rise rate. (c) ε represents the final temperature rise of the feed rod. (o) The ambient temperature before the DC current is input to the feed rod is given by: e is an exponential function, k″ is the optimal temperature rise coefficient, λ is the temperature-time coefficient, C is the soil heat capacity coefficient, δ is the soil thermal conductivity, and R... e Let A be the grounding resistance of a single vertical grounding electrode, A be the surface area of ​​the vertical grounding electrode filled with coke, and ρ be the soil resistivity.

[0068] As a preferred embodiment, the temperature rise uniformity coefficient iteration module includes: a temperature rise uniformity coefficient iteration unit;

[0069] The temperature rise homogenization coefficient iteration unit is used to obtain the coke filling diameter corresponding to the upper, middle and lower sub-segments of the feed rod, and to calculate the surface area of ​​the coke filling corresponding to the upper, middle and lower sub-segments of the feed rod.

[0070] To obtain the optimal temperature rise mathematical model, and combining it with the surface area of ​​the coke filling the upper, middle, and lower segments of the feed rod, we obtain the temperature rise mathematical models for the upper, middle, and lower segments of the feed rod:

[0071]

[0072]

[0073]

[0074] in, and These represent the mathematical models of temperature rise for the upper, middle, and lower segments of the feed rod, respectively, where t represents different time points during the temperature rise process, and ε represents the temperature rise coefficient. (c) ε represents the final temperature rise of the feed rod. (o) The ambient temperature before the DC current is input to the feed bar, e is an exponential function, k″ is the optimal temperature rise coefficient, and λ a , λ b and λ c These represent the temperature-time coefficients for the upper, middle, and lower segments of the feed rod, respectively; C is the soil's heat capacity coefficient; δ is the soil's thermal conductivity; and R...e ρ is the grounding resistance of a single vertical grounding electrode, A is the surface area of ​​the vertical grounding electrode filled with coke, and ρ is the soil resistivity.

[0075] Obtain the final temperature rise time from the temperature rise data of the feed rod, combine it with the temperature rise mathematical models corresponding to the upper, middle and lower segments of the feed rod, calculate the temperature rise uniformity coefficient of the feed rod, confirm that the temperature rise uniformity coefficient meets the preset requirements, and complete the iterative update:

[0076]

[0077] Where D is the temperature rise uniformity coefficient of the feed rod, and T1 is the final temperature rise time in the temperature rise data of the feed rod. and These represent the mathematical models for the temperature rise of the upper, middle, and lower segments of the feed rod, respectively.

[0078] As a preferred embodiment, the temperature rise uniformity coefficient iteration unit includes: a temperature rise uniformity coefficient iteration subunit;

[0079] The temperature rise uniformity coefficient iteration subunit is used to obtain the preset temperature rise uniformity range of the vertical grounding electrode. When the temperature rise uniformity coefficient of the feed rod is not in the preset temperature rise uniformity range of the vertical grounding electrode, the coke filling diameter corresponding to the upper, middle and lower sub-segments of the feed rod is iteratively updated.

[0080] Record the temperature rise data of the feed rod corresponding to the coke filling diameter in the current iteration; and calculate and update the temperature rise uniformity coefficient of the feed rod.

[0081] When the temperature rise uniformity coefficient of the feed rod is within the preset temperature rise uniformity range of the vertical grounding electrode, the iterative update is completed, and the coke filling diameter of the current iteration is output.

[0082] Accordingly, this invention provides a vertical grounding electrode temperature rise uniformity control system, including: a DC current generating module, a vertical grounding electrode well temperature rise testing module, a current-conducting cable, a current-shunting cable, and the above-mentioned vertical grounding electrode temperature rise uniformity control device.

[0083] The DC current generating module is used to generate DC current.

[0084] The vertical grounding electrode well temperature rise test module is used to receive the DC current generated by the DC current generation module, so as to change the temperature of the feed rod of the vertical grounding electrode and record the temperature change data of the feed rod.

[0085] The current-conducting cable and the current-shunting cable are used to transmit the DC current generated by the DC current generating module;

[0086] The vertical grounding electrode temperature rise uniformity control device is used to control the temperature rise uniformity of the vertical grounding electrode.

[0087] As a preferred embodiment, the DC current generating module includes: an AC power supply cabinet, a rectifier, a disconnecting switch, and a busbar;

[0088] The busbar is connected to the current-conducting cable, the current-conducting cable is connected to the shunt cable, and the shunt cable is connected to the vertical grounding electrode well temperature rise test module.

[0089] As a preferred embodiment, the vertical grounding electrode well temperature rise test module includes: a grounding electrode feed rod, a feed rod shunt cable, a temperature sensor, coke, a signal transmission line, a data logger, an epoxy resin package, and soil.

[0090] The grounding electrode feed rod is divided into upper, middle and lower sub-segments, and each sub-segment is equipped with a temperature sensor. The temperature sensor is connected to the data logger through a signal transmission line. The feed rod shunt cable and the grounding electrode feed rod are welded together, and the weld joint is wrapped with epoxy resin. The feed rod shunt cable and the shunt cable are connected. Attached Figure Description

[0091] Figure 1 : A flowchart illustrating the steps of a method for controlling the uniform temperature rise of a vertical grounding electrode according to an embodiment of the present invention;

[0092] Figure 2 : A schematic diagram of the device structure for a vertical grounding electrode temperature rise uniformity control device provided in an embodiment of the present invention;

[0093] Figure 3 : A schematic diagram of the system structure of a vertical grounding electrode temperature rise uniformity control system provided in an embodiment of the present invention;

[0094] Figure 4 : This is a schematic diagram of the structure and connection of a DC current generating module provided in an embodiment of the present invention, wherein, 101: AC power supply cabinet, 102: rectifier, 103: disconnecting switch, 104: busbar, 2: vertical grounding electrode well temperature rise test module, 3: current-conducting cable, 4: shunt cable;

[0095] Figure 5 : This is a schematic diagram of a vertical grounding electrode well temperature rise testing module provided in an embodiment of the present invention, wherein 201: grounding electrode feed rod, 202: feed rod shunt cable, 203: temperature sensor, 204: coke, 205: signal transmission line, 206: data logger, 207: epoxy resin package, 208: soil. Detailed Implementation

[0096] 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. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0097] In the field of research on temperature rise distribution of vertical grounding electrodes, researchers usually focus on the temperature rise experiments and results analysis of vertical grounding electrodes, but lack research on temperature rise control and temperature rise uniformity of vertical grounding electrodes. However, since the feed rod of the vertical grounding electrode is vertically downward, uneven temperature rise of the vertical grounding electrode will lead to excessive temperature rise at the bottom of the feed rod, which will result in instability and shorten the service life of the vertical grounding electrode, thus affecting the operation of the UHVDC transmission system.

[0098] Example 1

[0099] Please refer to Figure 1 The flowchart of a direct electrode temperature rise uniformity control method provided in this embodiment of the invention includes steps S1-S4.

[0100] Step S1: When the temperature of the feed rod of the vertical grounding electrode changes, acquire the temperature rise data of the feed rod and the environmental data.

[0101] In this embodiment, when the temperature of the feed rod of the vertical grounding electrode changes, acquiring the temperature rise data and environmental data of the feed rod specifically involves:

[0102] When the temperature of the feed rod of the vertical grounding electrode changes, the ambient temperature data of the feed rod and the temperature rise value of each sub-segment are recorded to obtain the temperature rise data of each sub-segment of the feed rod; wherein, each sub-segment of the feed rod includes: upper sub-segment, middle sub-segment and lower sub-segment of the feed rod;

[0103] When the temperature of the feed rod remains constant, the final temperature rise time and final temperature rise value of the feed rod are obtained; the final temperature rise time, final temperature rise value and temperature rise data of the feed rod segment are processed to obtain the temperature rise data of the feed rod.

[0104] Soil data of the power supply rod is obtained, and combined with the ambient temperature data of the power supply rod, the environmental data of the power supply rod is obtained.

[0105] In one optional embodiment, when the temperature of the feed rod of the vertical grounding electrode changes, the temperature rise values ​​of the feed rod and its upper, middle, and lower segments are recorded respectively; when the temperature of the feed rod remains constant, the final temperature rise value and final temperature rise time of the feed rod are recorded, and the recording of the temperature rise values ​​of each segment of the feed rod is stopped, thus obtaining the temperature rise data of the feed rod and each segment of the feed rod; the temperature rise data of the feed rod and each segment of the feed rod are sorted out, and outliers in the temperature rise data are removed.

[0106] In an optional embodiment, when the temperature of the feed rod of the vertical grounding electrode changes, the ambient temperature of the feed rod is recorded, and the thermal capacity coefficient, thermal conductivity, and resistivity data of the soil around the feed rod are measured. The above data are then calibrated and cleaned to obtain the environmental data of the feed rod.

[0107] Step S2: Based on the temperature rise data of the feed rod and environmental data, and combined with the particle swarm optimization algorithm, construct the optimal temperature rise mathematical model.

[0108] In this embodiment, the step of constructing an optimal temperature rise mathematical model based on the temperature rise data of the feed rod and environmental data, combined with the particle swarm optimization algorithm, specifically involves:

[0109] Obtain the preset temperature-time coefficient, and combine it with the temperature rise data of the feed rod and environmental data to construct an initial temperature rise mathematical model:

[0110]

[0111]

[0112] Among them, y (t) Let ε be the mathematical model function for temperature rise, where t represents different time points during the temperature rise process. (c) ε represents the final temperature rise of the feed rod. (o) The ambient temperature before the DC current is input to the feed rod is given by: e is an exponential function, k is the temperature rise coefficient, λ is the temperature-time coefficient, C is the soil heat capacity coefficient, δ is the soil thermal conductivity, and R... e ρ is the grounding resistance of a single vertical grounding electrode, A is the surface area of ​​the vertical grounding electrode filled with coke, and ρ is the soil resistivity.

[0113] Based on the preset initial temperature rise change coefficient k ′ By combining the particle swarm optimization algorithm, the initial particle positions and particle counts are obtained, and the objective function for particle swarm optimization is constructed:

[0114]

[0115] Where F(k) is the objective function of particle swarm optimization, y(t) is the actual measured temperature rise data, y(t) is the simulated value of the temperature rise mathematical model, and N is the number of particles in the swarm.

[0116] The objective function for particle swarm optimization is iteratively updated based on the preset initial particle velocity and maximum number of iterations.

[0117] When the preset maximum number of iterations is reached, the iterative update of the objective function for particle swarm optimization is stopped, and the optimal temperature change coefficient k″ is obtained.

[0118] Based on the optimal temperature change coefficient k″, the parameters of the initial temperature rise mathematical model are optimized to obtain the optimal temperature rise mathematical model:

[0119]

[0120] Among them, y (t) Let ε be the mathematical model function for temperature rise, where t represents different time points during the temperature rise process. (c) ε represents the final temperature rise of the feed rod. (o) The ambient temperature before the DC current is input to the feed rod is given by: e is an exponential function, k″ is the optimal temperature rise coefficient, λ is the temperature-time coefficient, C is the soil heat capacity coefficient, δ is the soil thermal conductivity, and R... e Let A be the grounding resistance of a single vertical grounding electrode, A be the surface area of ​​the vertical grounding electrode filled with coke, and ρ be the soil resistivity.

[0121] In one optional embodiment, after constructing the initial temperature rise mathematical model, the initial temperature rise variation coefficient is set to 5. The number of particles in the particle swarm optimization algorithm is determined based on the collected temperature rise data of the feed rod, and the particle swarm number and the number of particles are kept consistent, thereby constructing the objective function of particle swarm optimization. The number of iterations is set to 100, and the objective function of particle swarm optimization is iteratively updated. When the number of iterations reaches 100 or the value of the objective function of particle swarm optimization is less than 1.2, the iterative update is stopped, and the optimal temperature rise variation coefficient is obtained. The optimal temperature rise variation coefficient is then substituted into the initial temperature rise mathematical model to obtain the optimal temperature rise mathematical model.

[0122] It should be noted that the initial temperature rise coefficient, the number of iterations, and the target value of the particle swarm optimization objective function can be determined by those skilled in the art based on historical experimental data and actual conditions. Of course, they can also be set based on the experience of those skilled in the art. In this embodiment, the initial temperature rise coefficient can be any value from 0.1 to 10; the number of iterations is set to 100; and the target value of the particle swarm optimization objective function is set to less than 1.2, i.e., meeting the iteration stopping condition. It should be understood that due to differences in historical experimental data and actual conditions, other values ​​that those skilled in the art can obtain without creative effort are all within the scope of protection of this invention.

[0123] It should be noted that the Particle Swarm Optimization (PSO) algorithm used in this embodiment finds the optimal solution to the problem by allowing particles to fly in the search space and using the individual optimal position and the group's optimal position to guide the particle's flight direction and velocity. Each particle has a position and a velocity in the search space, and by continuously updating these two parameters, the particle can gradually approach the optimal solution.

[0124] Step S3: Iteratively update the coke filling diameter of the feed rod, and calculate the temperature rise uniformity coefficient of the current iteration based on the coke filling diameter of the current iteration and the optimal temperature rise mathematical model, until the temperature rise uniformity coefficient meets the preset requirements.

[0125] In this embodiment, the coke filling diameter of the feed rod is updated iteratively, and the temperature rise homogenization coefficient of the current iteration is calculated based on the coke filling diameter of the current iteration and the optimal temperature rise mathematical model, until the temperature rise homogenization coefficient meets the preset requirements, specifically:

[0126] Obtain the coke filling diameter corresponding to the upper, middle and lower sub-segments of the feed rod, and calculate the surface area of ​​the coke filling corresponding to the upper, middle and lower sub-segments of the feed rod;

[0127] To obtain the optimal temperature rise mathematical model, and combining it with the surface area of ​​the coke filling the upper, middle, and lower segments of the feed rod, we obtain the temperature rise mathematical models for the upper, middle, and lower segments of the feed rod:

[0128]

[0129]

[0130]

[0131] in, and These represent the mathematical models of temperature rise for the upper, middle, and lower segments of the feed rod, respectively, where t represents different time points during the temperature rise process, and ε represents the temperature rise coefficient. (c) ε represents the final temperature rise of the feed rod. (o) The ambient temperature before the DC current is input to the feed bar, e is an exponential function, k″ is the optimal temperature rise coefficient, and λ a , λ b and λ c These represent the temperature-time coefficients for the upper, middle, and lower segments of the feed rod, respectively; C is the soil's heat capacity coefficient; δ is the soil's thermal conductivity; and R... e ρ is the grounding resistance of a single vertical grounding electrode, A is the surface area of ​​the vertical grounding electrode filled with coke, and ρ is the soil resistivity.

[0132] Obtain the final temperature rise time from the temperature rise data of the feed rod, combine it with the temperature rise mathematical models corresponding to the upper, middle and lower segments of the feed rod, calculate the temperature rise uniformity coefficient of the feed rod, confirm that the temperature rise uniformity coefficient meets the preset requirements, and complete the iterative update:

[0133]

[0134] Where D is the temperature rise uniformity coefficient of the feed rod, and T1 is the final temperature rise time in the temperature rise data of the feed rod. and These represent the mathematical models for the temperature rise of the upper, middle, and lower segments of the feed rod, respectively.

[0135] In this embodiment, confirming that the temperature rise uniformity coefficient meets the preset requirements and completing the iterative update specifically involves:

[0136] Obtain the preset temperature rise uniformity range of the vertical grounding electrode. When the temperature rise uniformity coefficient of the feed rod is not within the preset temperature rise uniformity range of the vertical grounding electrode, iteratively update the coke filling diameter corresponding to the upper, middle and lower sub-segments of the feed rod.

[0137] Record the temperature rise data of the feed rod corresponding to the coke filling diameter in the current iteration; and calculate and update the temperature rise uniformity coefficient of the feed rod.

[0138] When the temperature rise uniformity coefficient of the feed rod is within the preset temperature rise uniformity range of the vertical grounding electrode, the iterative update is completed, and the coke filling diameter of the current iteration is output.

[0139] In an optional embodiment, the temperature rise uniformity range of the vertical grounding electrode is set to 0 to 0.7 and 0.7 to 1; when the temperature rise uniformity coefficient of the feed rod is greater than or equal to 0 and less than or equal to 0.7, it indicates that the temperature rise uniformity of the vertical grounding electrode meets the requirements; when the temperature rise uniformity coefficient of the feed rod is greater than 0.7 and less than or equal to 1, it indicates that the temperature rise uniformity of the vertical grounding electrode does not meet the requirements.

[0140] It should be noted that the temperature rise uniformity range of the vertical grounding electrode described in this embodiment can be determined by those skilled in the art based on historical experimental data and actual conditions. Of course, it can also be set based on the experience of those skilled in the art. In this embodiment, the temperature rise uniformity range of the vertical grounding electrode is set to 0 to 0.7 and 0.7 to 1. It should be understood that, due to differences in historical experimental data and actual conditions, other values ​​that those skilled in the art can obtain without creative effort are all within the scope of protection of this invention.

[0141] This embodiment acquires temperature rise data and environmental data of the feeder rod in the vertical grounding electrode and constructs a temperature rise mathematical model based on this data. This constructed mathematical model, using the feeder rod data and environmental data as a benchmark, reduces interference from other unnecessary data, improves the accuracy of the temperature rise mathematical model, and consequently improves the accuracy of the subsequent temperature rise uniformity coefficient. The temperature rise uniformity coefficient is calculated based on the temperature rise mathematical model and the coke filling diameter data of the feeder rod. This coefficient is used to measure the uniformity of the vertical grounding electrode, making the temperature rise uniformity control of the vertical grounding electrode more accurate. This prevents the feeder rod bottom from being damaged due to excessive temperature rise, thus improving the energizing stability of the vertical grounding electrode.

[0142] Example 2

[0143] Please refer to Figure 2 The above is a schematic diagram of the device structure of a vertical grounding electrode temperature rise uniformity control device provided in an embodiment of the present invention, including: a feed rod data acquisition module 501, a temperature rise mathematical model construction module 502, a temperature rise uniformity coefficient iteration module 503, and a temperature rise uniformity control module 504.

[0144] The feed rod data acquisition module 501 is used to acquire temperature rise data and environmental data of the feed rod when the temperature of the feed rod of the vertical grounding electrode changes.

[0145] In this embodiment, the feed rod data acquisition module 501 includes: a feed rod data acquisition unit;

[0146] The feed bar data acquisition unit is used to record the ambient temperature data and the temperature rise value of each sub-segment of the feed bar when the temperature of the feed bar of the vertical grounding electrode changes, so as to obtain the temperature rise data of each sub-segment of the feed bar; wherein, each sub-segment of the feed bar includes: upper sub-segment, middle sub-segment and lower sub-segment of the feed bar;

[0147] When the temperature of the feed rod remains constant, the final temperature rise time and final temperature rise value of the feed rod are obtained; the final temperature rise time, final temperature rise value and temperature rise data of the feed rod segment are processed to obtain the temperature rise data of the feed rod.

[0148] Soil data of the power supply rod is obtained, and combined with the ambient temperature data of the power supply rod, the environmental data of the power supply rod is obtained.

[0149] The temperature rise mathematical model construction module 502 is used to construct the optimal temperature rise mathematical model based on the temperature rise data of the feed rod and environmental data, combined with the particle swarm algorithm.

[0150] In this embodiment, the temperature rise mathematical model construction module 502 includes: a temperature rise mathematical model construction unit;

[0151] The temperature rise mathematical model building unit is used to obtain a preset temperature-time coefficient and, combined with the temperature rise data of the feed rod and environmental data, construct an initial temperature rise mathematical model:

[0152]

[0153]

[0154] Among them, y (t) Let ε be the mathematical model function for temperature rise, t represent different time points during the temperature rise process, and ε be the temperature rise rate. (c) ε represents the final temperature rise of the feed rod. (o) The ambient temperature before the DC current is input to the feed rod is given by: e is an exponential function, k is the temperature rise coefficient, λ is the temperature-time coefficient, C is the soil heat capacity coefficient, δ is the soil thermal conductivity, and R... e ρ is the grounding resistance of a single vertical grounding electrode, A is the surface area of ​​the vertical grounding electrode filled with coke, and ρ is the soil resistivity.

[0155] Based on the preset initial temperature rise change coefficient k ′ By combining the particle swarm optimization algorithm, the initial particle positions and particle counts are obtained, and the objective function for particle swarm optimization is constructed:

[0156]

[0157] Where F(k) is the objective function of particle swarm optimization, Y(t) is the actual measured temperature rise data, y(t) is the simulated value of the temperature rise mathematical model, and N is the number of particles in the swarm.

[0158] The objective function for particle swarm optimization is iteratively updated based on the preset initial particle velocity and maximum number of iterations.

[0159] When the preset maximum number of iterations is reached, the iterative update of the objective function for particle swarm optimization is stopped, and the optimal temperature change coefficient k″ is obtained.

[0160] Based on the optimal temperature change coefficient k″, the parameters of the initial temperature rise mathematical model are optimized to obtain the optimal temperature rise mathematical model:

[0161]

[0162] Among them, y (t) Here, δ is the mathematical model function for temperature rise, where t represents different time points during the temperature rise process. (c) δ represents the final temperature rise of the feed rod. (o) The ambient temperature before the DC current is input to the feed rod is given by: e is an exponential function, k″ is the optimal temperature rise coefficient, λ is the temperature-time coefficient, C is the soil heat capacity coefficient, δ is the soil thermal conductivity, and R... eLet A be the grounding resistance of a single vertical grounding electrode, A be the surface area of ​​the vertical grounding electrode filled with coke, and ρ be the soil resistivity.

[0163] The temperature rise uniformity coefficient iteration module 503 is used to iteratively update the coke filling diameter of the feed rod, and calculate the temperature rise uniformity coefficient of the current iteration based on the coke filling diameter of the current iteration and the optimal temperature rise mathematical model, until the temperature rise uniformity coefficient meets the preset requirements.

[0164] In this embodiment, the temperature rise uniformity coefficient iteration module 503 includes: a temperature rise uniformity coefficient iteration unit;

[0165] The temperature rise homogenization coefficient iteration unit is used to obtain the coke filling diameter corresponding to the upper, middle and lower sub-segments of the feed rod, and to calculate the surface area of ​​the coke filling corresponding to the upper, middle and lower sub-segments of the feed rod.

[0166] To obtain the optimal temperature rise mathematical model, and combining it with the surface area of ​​the coke filling the upper, middle, and lower segments of the feed rod, we obtain the temperature rise mathematical models for the upper, middle, and lower segments of the feed rod:

[0167]

[0168]

[0169]

[0170] in, and These represent the mathematical models of temperature rise for the upper, middle, and lower segments of the feed rod, respectively, where t represents different time points during the temperature rise process, and ε represents the temperature rise coefficient. (c) ε represents the final temperature rise of the feed rod. (o) The ambient temperature before the DC current is input to the feed bar, e is an exponential function, k″ is the optimal temperature rise coefficient, and λ a , λ b and λ c These represent the temperature-time coefficients for the upper, middle, and lower segments of the feed rod, respectively; C is the soil's heat capacity coefficient; δ is the soil's thermal conductivity; and R... e ρ is the grounding resistance of a single vertical grounding electrode, A is the surface area of ​​the vertical grounding electrode filled with coke, and ρ is the soil resistivity.

[0171] Obtain the final temperature rise time from the temperature rise data of the feed rod, combine it with the temperature rise mathematical models corresponding to the upper, middle and lower segments of the feed rod, calculate the temperature rise uniformity coefficient of the feed rod, confirm that the temperature rise uniformity coefficient meets the preset requirements, and complete the iterative update:

[0172]

[0173] Where D is the temperature rise uniformity coefficient of the feed rod, and T1 is the final temperature rise time in the temperature rise data of the feed rod. and These represent the mathematical models for the temperature rise of the upper, middle, and lower segments of the feed rod, respectively.

[0174] The temperature rise uniformity control module 504 is used to control the temperature rise uniformity of the vertical grounding electrode according to the coke filling diameter of the feed rod output by the iteration.

[0175] In this embodiment, the temperature rise uniformity coefficient iteration unit includes: a temperature rise uniformity coefficient iteration subunit;

[0176] The temperature rise uniformity coefficient iteration subunit is used to obtain the preset temperature rise uniformity range of the vertical grounding electrode. When the temperature rise uniformity coefficient of the feed rod is not in the preset temperature rise uniformity range of the vertical grounding electrode, the coke filling diameter corresponding to the upper, middle and lower sub-segments of the feed rod is iteratively updated.

[0177] Record the temperature rise data of the feed rod corresponding to the coke filling diameter in the current iteration; and calculate and update the temperature rise uniformity coefficient of the feed rod.

[0178] When the temperature rise uniformity coefficient of the feed rod is within the preset temperature rise uniformity range of the vertical grounding electrode, the iterative update is completed, and the coke filling diameter of the current iteration is output.

[0179] This embodiment acquires temperature rise data and environmental data of the feeder rod in the vertical grounding electrode and constructs a temperature rise mathematical model based on this data. This constructed mathematical model, using the feeder rod data and environmental data as a benchmark, reduces interference from other unnecessary data, improves the accuracy of the temperature rise mathematical model, and consequently improves the accuracy of the subsequent temperature rise uniformity coefficient. The temperature rise uniformity coefficient is calculated based on the temperature rise mathematical model and the coke filling diameter data of the feeder rod. This coefficient is used to measure the uniformity of the vertical grounding electrode, making the temperature rise uniformity control of the vertical grounding electrode more accurate. This prevents the feeder rod bottom from being damaged due to excessive temperature rise, thus improving the energizing stability of the vertical grounding electrode.

[0180] Example 3

[0181] Please refer to Figure 3 The above is a system structure diagram of a vertical grounding electrode temperature rise uniformity control system provided in an embodiment of the present invention, including: a DC current generating module 1, a vertical grounding electrode well temperature rise testing module 2, a current-conducting cable 3, a current-shunting cable 4, and a vertical grounding electrode temperature rise uniformity control device 5 as described in Embodiment 2.

[0182] The DC current generating module 1 is used to generate DC current.

[0183] In this embodiment, the DC current generating module 1 includes: AC power supply cabinet 101, rectifier 102, disconnect switch 103 and busbar 104;

[0184] Among them, the busbar 104 is connected to the current-conducting cable 3, the current-conducting cable 3 is connected to the current-shunting cable 4, and the current-shunting cable 4 is connected to the vertical grounding electrode well temperature rise test module 2.

[0185] In one alternative embodiment, please refer to Figure 4 This is a schematic diagram of the structure and connection of a DC current generating module provided in an embodiment of the present invention; wherein, the AC power supply cabinet 101, the rectifier 102 and the disconnecting switch 103 are connected in sequence, the disconnecting switch 103 is connected to the busbar 104, the busbar 104 is connected to the current-conducting cable 3, the current-conducting cable 3 is connected to the shunt cable 4, and the shunt cable 4 is connected to the vertical grounding electrode well temperature rise test module 2.

[0186] The vertical grounding electrode well temperature rise test module 2 is used to receive the DC current generated by the DC current generation module, so as to change the temperature of the feed rod of the vertical grounding electrode and record the temperature change data of the feed rod.

[0187] In this embodiment, the vertical grounding electrode well temperature rise test module 2 includes: grounding electrode feed rod 201, feed rod shunt cable 202, temperature sensor 203, coke 204, signal transmission line 205, data logger 206, epoxy resin package 207, and soil 208.

[0188] The grounding electrode feed rod 201 is divided into upper, middle and lower sub-segments, and each sub-segment is equipped with a temperature sensor 203. The temperature sensor 203 is connected to the data logger 206 through a signal transmission line. The feed rod shunt cable 202 and the grounding electrode feed rod 201 are welded together, and the weld joint is wrapped with epoxy resin 207. The feed rod shunt cable 202 and the shunt cable 4 are connected.

[0189] In one alternative embodiment, please refer to Figure 5 This is a schematic diagram of a vertical grounding electrode well temperature rise testing module provided in an embodiment of the present invention; wherein, the grounding electrode feed rod 201 is divided into upper, middle and lower sub-segments, and a temperature sensor 203 is arranged at the bottom of each sub-segment. The temperature sensor 203 is connected to the data logger 206 through a signal transmission line; the feed rod shunt cable 202 and the grounding electrode feed rod 201 are welded together, and the weld joint is covered with epoxy resin 207. The feed rod shunt cable 202 and the shunt cable 4 are connected.

[0190] In an optional embodiment, the grounding electrode feed rod 201 receives a DC current of more than 1000A generated by the DC current generating module 1, causing a temperature change in the grounding electrode feed rod 201. The current then flows through the coke 204 to the soil 208. The temperature sensor 203 measures the temperature of the grounding electrode feed rod 201 at different times in real time and transmits the data to the data logger 206. The DC current of more than 1000A generated by the DC current generating module 1 is transmitted to the grounding electrode feed rod 201 through the current-conducting cable 3, the current-shunting cable 4, and the feed rod current-shunting cable 202, respectively.

[0191] The current-carrying cable 3 and the current-splitting cable 4 are used to transmit the DC current generated by the DC current generating module.

[0192] The vertical grounding electrode temperature rise uniformity control device 5 is used to control the temperature rise uniformity of the vertical grounding electrode.

[0193] In this embodiment, a DC current is generated by the DC current generating module in the vertical grounding electrode temperature rise uniformity control system. The DC current is transmitted through a cable into the feed rod in the vertical grounding electrode well temperature rise test module, so that the temperature of the feed rod changes and the temperature rise change data is recorded, so that the vertical grounding electrode temperature rise uniformity control device can control the temperature rise uniformity of the vertical grounding electrode.

[0194] In summary, this embodiment of the invention acquires temperature rise data and environmental data of the feeder rod in the vertical grounding electrode and constructs a temperature rise mathematical model based on this data. This constructed mathematical model, using feeder rod data and environmental data as a benchmark, reduces interference from other unnecessary data, improves the accuracy of the temperature rise mathematical model, and consequently improves the accuracy of the subsequent temperature rise uniformity coefficient. The temperature rise uniformity coefficient is calculated based on the temperature rise mathematical model and the coke filling diameter data of the feeder rod. This coefficient measures the uniformity of the vertical grounding electrode, making the temperature rise uniformity control of the vertical grounding electrode more accurate. This prevents damage to the feeder rod's lifespan due to excessive temperature rise at the bottom of the vertical grounding electrode, thereby improving the energizing stability of the vertical grounding electrode. Furthermore, a DC current generation module in the vertical grounding electrode temperature rise uniformity control system generates DC current, which is transmitted through a cable to the feeder rod in the vertical grounding electrode well temperature rise test module, causing a temperature change in the feeder rod. This allows the vertical grounding electrode temperature rise uniformity control device to control the temperature rise uniformity of the vertical grounding electrode.

[0195] The specific embodiments described above further illustrate the purpose, technical solution, and beneficial effects of the present invention. It should be understood that the above descriptions are merely specific embodiments of the present invention and are not intended to limit the scope of protection of the present invention. In particular, it should be noted that 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 for those skilled in the art.

Claims

1. A method for controlling the uniform temperature rise of a vertical grounding electrode, characterized in that, include: When the temperature of the feed rod of the vertical grounding electrode changes, acquire the temperature rise data of the feed rod and environmental data; Based on the temperature rise data of the feed rod and environmental data, and combined with the particle swarm optimization algorithm, an optimal temperature rise mathematical model is constructed. The coke filling diameter of the feed rod is iteratively updated, and the temperature rise homogenization coefficient of the current iteration is calculated based on the current coke filling diameter and the optimal temperature rise mathematical model, until the temperature rise homogenization coefficient meets the preset requirements; specifically: the coke filling diameters corresponding to the upper, middle, and lower sub-segments of the feed rod are obtained, and the surface area of ​​the coke filling corresponding to the upper, middle, and lower sub-segments of the feed rod is calculated; the optimal temperature rise mathematical model is obtained, and combined with the surface area of ​​the coke filling corresponding to the upper, middle, and lower sub-segments of the feed rod, the temperature rise mathematical model corresponding to the upper, middle, and lower sub-segments of the feed rod is obtained: ， ， ， in, , and These represent the mathematical models for the temperature rise of the upper, middle, and lower segments of the feed rod, respectively. This indicates different points in time during the temperature rise process. This represents the final temperature rise of the feed rod. The ambient temperature before the DC current is input to the feed rod. It is an exponential function. The optimal temperature rise coefficient is... , and These are the temperature-time coefficients corresponding to the upper, middle, and lower sub-segments of the feed rod, respectively. Obtain the final temperature rise time from the temperature rise data of the feed rod, combine it with the temperature rise mathematical models corresponding to the upper, middle and lower segments of the feed rod, calculate the temperature rise uniformity coefficient of the feed rod, confirm that the temperature rise uniformity coefficient meets the preset requirements, and complete the iterative update: ， Where D is the temperature rise uniformity coefficient of the feed rod. This refers to the final temperature rise time in the temperature rise data of the feed rod. , and These represent the mathematical models for the temperature rise of the upper, middle, and lower segments of the feed rod, respectively. The temperature rise uniformity of the vertical grounding electrode is controlled based on the coke filling diameter of the feed rod output by the iteration.

2. The method for uniform temperature rise control of a vertical grounding electrode as described in claim 1, characterized in that, When the temperature of the feed rod of the vertical grounding electrode changes, the temperature rise data and environmental data of the feed rod are acquired, specifically as follows: When the temperature of the feed rod of the vertical grounding electrode changes, the ambient temperature data of the feed rod and the temperature rise value of each sub-segment are recorded to obtain the temperature rise data of each sub-segment of the feed rod; wherein, each sub-segment of the feed rod includes: upper sub-segment, middle sub-segment and lower sub-segment of the feed rod; When the temperature of the feed rod remains constant, the final temperature rise time and final temperature rise value of the feed rod are obtained; the final temperature rise time, final temperature rise value and temperature rise data of the feed rod segment are processed to obtain the temperature rise data of the feed rod. Soil data of the power supply rod is obtained, and combined with the ambient temperature data of the power supply rod, the environmental data of the power supply rod is obtained.

3. The method for uniform temperature rise control of a vertical grounding electrode as described in claim 1, characterized in that, The optimal temperature rise mathematical model is constructed based on the temperature rise data of the feed rod and environmental data, combined with the particle swarm optimization algorithm, as follows: Obtain the preset temperature-time coefficient, and combine it with the temperature rise data of the feed rod and environmental data to construct an initial temperature rise mathematical model: ， ， in, For the temperature rise mathematical model function, This indicates different points in time during the temperature rise process. This represents the final temperature rise of the feed rod. The ambient temperature before the DC current is input to the feed rod. It is an exponential function. The coefficient of temperature change. This is the temperature-time coefficient. The heat capacity coefficient of the soil. For the thermal conductivity of soil, The grounding resistance for a single vertical grounding electrode. The surface area of ​​coke to fill the vertical grounding electrode. Soil resistivity; Based on the preset initial temperature rise change coefficient By combining the particle swarm optimization algorithm, the initial particle positions and particle counts are obtained, and the objective function for particle swarm optimization is constructed: ， in, The objective function for particle swarm optimization is... The actual measured temperature rise data. These are the simulation values ​​from the temperature rise mathematical model. This represents the total number of time points during the temperature rise process. The objective function for particle swarm optimization is iteratively updated based on the preset initial particle velocity and maximum number of iterations. When the preset maximum number of iterations is reached, the iterative update of the objective function for particle swarm optimization is stopped, and the optimal temperature change coefficient is obtained. ; Based on the optimal temperature change coefficient By optimizing the parameters of the initial temperature rise mathematical model, the optimal temperature rise mathematical model is obtained: ， in, For the temperature rise mathematical model function, This indicates different points in time during the temperature rise process. This represents the final temperature rise of the feed rod. The ambient temperature before the DC current is input to the feed rod. It is an exponential function. The optimal temperature rise coefficient is... This represents the temperature-time coefficient.

4. The method for uniform temperature rise control of a vertical grounding electrode as described in claim 1, characterized in that, The process of confirming that the temperature rise uniformity coefficient meets the preset requirements and completing the iterative update is as follows: Obtain the preset temperature rise uniformity range of the vertical grounding electrode. When the temperature rise uniformity coefficient of the feed rod is not within the preset temperature rise uniformity range of the vertical grounding electrode, iteratively update the coke filling diameter corresponding to the upper, middle and lower sub-segments of the feed rod. Record the temperature rise data of the feed rod corresponding to the coke filling diameter in the current iteration; and calculate and update the temperature rise uniformity coefficient of the feed rod. When the temperature rise uniformity coefficient of the feed rod is within the preset temperature rise uniformity range of the vertical grounding electrode, the iterative update is completed, and the coke filling diameter of the current iteration is output.

5. A vertical grounding electrode temperature rise uniformity control device, characterized in that, include: The module includes a feed bar data acquisition module, a temperature rise mathematical model construction module, a temperature rise uniformity coefficient iteration module, and a temperature rise uniformity control module. The feed rod data acquisition module is used to acquire temperature rise data and environmental data of the feed rod when the temperature of the feed rod of the vertical grounding electrode changes. The temperature rise mathematical model construction module is used to construct the optimal temperature rise mathematical model based on the temperature rise data of the feed rod and environmental data, combined with the particle swarm algorithm. The temperature rise homogenization coefficient iteration module is used to iteratively update the coke filling diameter of the feed rod, and calculate the temperature rise homogenization coefficient of the current iteration based on the current coke filling diameter and the optimal temperature rise mathematical model, until the temperature rise homogenization coefficient meets the preset requirements; the temperature rise homogenization coefficient iteration module includes: a temperature rise homogenization coefficient iteration unit; the temperature rise homogenization coefficient iteration unit is used to obtain the coke filling diameter corresponding to the upper, middle and lower sub-segments of the feed rod, calculate the surface area of ​​the filling coke corresponding to the upper, middle and lower sub-segments of the feed rod; obtain the optimal temperature rise mathematical model, and combine it with the surface area of ​​the filling coke corresponding to the upper, middle and lower sub-segments of the feed rod to obtain the temperature rise mathematical model corresponding to the upper, middle and lower sub-segments of the feed rod: ， ， ， in, , and These represent the mathematical models for the temperature rise of the upper, middle, and lower segments of the feed rod, respectively. This indicates different points in time during the temperature rise process. This represents the final temperature rise of the feed rod. The ambient temperature before the DC current is input to the feed rod. It is an exponential function. The optimal temperature rise coefficient is... , and These are the temperature-time coefficients corresponding to the upper, middle, and lower sub-segments of the feed rod, respectively. Obtain the final temperature rise time from the temperature rise data of the feed rod, combine it with the temperature rise mathematical models corresponding to the upper, middle and lower segments of the feed rod, calculate the temperature rise uniformity coefficient of the feed rod, confirm that the temperature rise uniformity coefficient meets the preset requirements, and complete the iterative update: ， Where D is the temperature rise uniformity coefficient of the feed rod. This refers to the final temperature rise time in the temperature rise data of the feed rod. , and These represent the mathematical models for the temperature rise of the upper, middle, and lower segments of the feed rod, respectively. The temperature rise uniformity control module is used to control the temperature rise uniformity of the vertical grounding electrode based on the coke filling diameter of the feed rod output by the iterative output.

6. The vertical grounding electrode temperature rise uniformity control device as described in claim 5, characterized in that, The feed rod data acquisition module includes: a feed rod data acquisition unit; The feed bar data acquisition unit is used to record the ambient temperature data and the temperature rise value of each sub-segment of the feed bar when the temperature of the feed bar of the vertical grounding electrode changes, so as to obtain the temperature rise data of each sub-segment of the feed bar; wherein, each sub-segment of the feed bar includes: upper sub-segment, middle sub-segment and lower sub-segment of the feed bar; When the temperature of the feed rod remains constant, the final temperature rise time and final temperature rise value of the feed rod are obtained; the final temperature rise time, final temperature rise value and temperature rise data of the feed rod segment are processed to obtain the temperature rise data of the feed rod. Soil data of the power supply rod is obtained, and combined with the ambient temperature data of the power supply rod, the environmental data of the power supply rod is obtained.

7. The vertical grounding electrode temperature rise uniformity control device as described in claim 5, characterized in that, The temperature rise mathematical model construction module includes: a temperature rise mathematical model construction unit; The temperature rise mathematical model building unit is used to obtain a preset temperature-time coefficient and, combined with the temperature rise data of the feed rod and environmental data, construct an initial temperature rise mathematical model: ， ， in, For the temperature rise mathematical model function, This indicates different points in time during the temperature rise process. This represents the final temperature rise of the feed rod. The ambient temperature before the DC current is input to the feed rod. It is an exponential function. The coefficient of temperature change. This is the temperature-time coefficient. The heat capacity coefficient of the soil. For the thermal conductivity of soil, The grounding resistance for a single vertical grounding electrode. The surface area of ​​coke to fill the vertical grounding electrode. Soil resistivity; Based on the preset initial temperature rise change coefficient By combining the particle swarm optimization algorithm, the initial particle positions and particle counts are obtained, and the objective function for particle swarm optimization is constructed: ， in, The objective function for particle swarm optimization is... The actual measured temperature rise data. These are the simulation values ​​from the temperature rise mathematical model. This represents the total number of time points during the temperature rise process. The objective function for particle swarm optimization is iteratively updated based on the preset initial particle velocity and maximum number of iterations. When the preset maximum number of iterations is reached, the iterative update of the objective function for particle swarm optimization is stopped, and the optimal temperature change coefficient is obtained. ; Based on the optimal temperature change coefficient By optimizing the parameters of the initial temperature rise mathematical model, the optimal temperature rise mathematical model is obtained: ， in, For the temperature rise mathematical model function, This indicates different points in time during the temperature rise process. This represents the final temperature rise of the feed rod. The ambient temperature before the DC current is input to the feed rod. It is an exponential function. The optimal temperature rise coefficient is... This represents the temperature-time coefficient.

8. The vertical grounding electrode temperature rise uniformity control device as described in claim 5, characterized in that, The temperature rise uniformity coefficient iteration unit includes: a temperature rise uniformity coefficient iteration subunit; The temperature rise uniformity coefficient iteration subunit is used to obtain the preset temperature rise uniformity range of the vertical grounding electrode. When the temperature rise uniformity coefficient of the feed rod is not in the preset temperature rise uniformity range of the vertical grounding electrode, the coke filling diameter corresponding to the upper, middle and lower sub-segments of the feed rod is iteratively updated. Record the temperature rise data of the feed rod corresponding to the coke filling diameter in the current iteration; and calculate and update the temperature rise uniformity coefficient of the feed rod. When the temperature rise uniformity coefficient of the feed rod is within the preset temperature rise uniformity range of the vertical grounding electrode, the iterative update is completed, and the coke filling diameter of the current iteration is output.

9. A vertical grounding electrode temperature rise uniformity control system, characterized in that, include: A DC current generating module, a vertical grounding electrode well temperature rise testing module, a current-conducting cable, a current-shunting cable, and a vertical grounding electrode temperature rise uniformity control device as described in any one of claims 5 to 8; The DC current generating module is used to generate DC current. The vertical grounding electrode well temperature rise test module is used to receive the DC current generated by the DC current generation module, so as to change the temperature of the feed rod of the vertical grounding electrode and record the temperature change data of the feed rod. The current-conducting cable and the current-shunting cable are used to transmit the DC current generated by the DC current generating module; The vertical grounding electrode temperature rise uniformity control device is used to control the temperature rise uniformity of the vertical grounding electrode.

10. A vertical grounding electrode temperature rise uniformity control system as described in claim 9, characterized in that, The DC current generating module includes: an AC power supply cabinet, a rectifier, a disconnect switch, and a busbar; The busbar is connected to the current-conducting cable, the current-conducting cable is connected to the shunt cable, and the shunt cable is connected to the vertical grounding electrode well temperature rise test module.

11. The vertical grounding electrode temperature rise uniformity control system as described in claim 9, characterized in that, The vertical grounding electrode well temperature rise test module includes: grounding electrode feed rod, feed rod shunt cable, temperature sensor, coke, signal transmission line, data logger, epoxy resin package and soil; The grounding electrode feed rod is divided into upper, middle and lower sub-segments, and each sub-segment is equipped with a temperature sensor. The temperature sensor is connected to the data logger through a signal transmission line. The feed rod shunt cable and the grounding electrode feed rod are welded together, and the weld joint is wrapped with epoxy resin. The feed rod shunt cable and the shunt cable are connected.

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