A method, device and system for evaluating vertical earth electrode flooding density homogenization

Abstract

The application discloses a vertical grounding electrode overflow density uniformization evaluation method, device and system, and belongs to the technical research field of extra-high voltage direct current transmission grounding electrode, wherein the vertical grounding electrode overflow density uniformization evaluation method comprises the following steps: a simulation model of the vertical grounding electrode is constructed, then the filling coke cross-section diameter of each electrode well in the simulation model is iteratively updated to obtain a required overflow density offset index; finally, the overflow density uniformization fitness of the vertical grounding electrode is calculated according to the current overflow density data of the simulation model and the actually measured current overflow density of each feeding rod of the vertical grounding electrode. The evaluation of the overflow density uniformization of the vertical grounding electrode is more accurate by combining the theoretical value with the actual value, so that the overflow density uniformization of the vertical grounding electrode can be better controlled, and the non-uniform overflow density of the vertical grounding electrode can be avoided to cause the feeding rod of the vertical grounding electrode to be seriously heated and the service life of the feeding rod to be reduced.

Description

Technical Field

[0001] This invention relates to the field of ultra-high voltage direct current transmission grounding electrode technology research, and in particular to a method, device and system for evaluating the uniformity of overflow density of vertical grounding electrodes. Background Technology

[0002] In recent years, with the rapid development of ultra-high voltage direct current (UHVDC) transmission technology, more and more UHVDC transmission projects have been completed and put into operation. Currently, UHVDC transmission is developing towards higher voltage, larger capacity, and longer distance. Among them, the UHVDC grounding electrode is an important component of the DC transmission system, providing a strong guarantee for the stability and safety of the DC transmission system. However, due to the inherent requirements of the grounding electrode, the selection of electrode sites is becoming increasingly difficult. From the traditional horizontal grounding electrode with a large footprint, vertical grounding electrodes and deep well grounding electrodes with relatively smaller footprints have been gradually developed. Therefore, further research is needed on the relevant electrical parameters of vertical grounding electrodes and deep well grounding electrodes.

[0003] A vertical grounding electrode is a type of grounding electrode deeply buried underground. It operates with a large current, and the current density distribution of its electrode feed rod is relatively uneven depending on the shape of the electrode ring. Overflow density uniformity, as a key performance parameter of vertical DC grounding electrodes, has a decisive impact on the overall system performance. Current technologies typically evaluate the degree of overflow density uniformity based solely on the current data of the vertical grounding electrode. However, this existing technology suffers from limitations in considering only one factor, making the evaluation and control of overflow density uniformity in vertical grounding electrodes inaccurate and unrealistic. Insufficient overflow density uniformity in vertical grounding electrodes will lead to severe overheating of the feed rod, reducing its service life. Therefore, a method or system is urgently needed to address the problem of inaccurate evaluation and control of overflow density uniformity in existing technologies. Summary of the Invention

[0004] This invention provides a method, apparatus, and system for evaluating the uniformity of overflow current density of vertical grounding electrodes, in order to solve the technical problem of being unable to accurately evaluate and control the degree of uniformity of overflow current density of vertical grounding electrodes.

[0005] To address the aforementioned technical problems, embodiments of the present invention provide a method for evaluating the uniformity of overflow current density at vertical grounding electrodes, comprising:

[0006] Based on the obtained equipment and environmental data of the vertical grounding electrode, a simulation model of the vertical grounding electrode is constructed.

[0007] Based on the overflow density offset index of the simulation model, the diameter of the coke-filled cross section of each electrode well in the simulation model is iteratively updated. Based on the diameter of the coke-filled cross section of each electrode well in the current iteration, the current overflow density data and overflow density offset index of the simulation model are calculated and updated until the overflow density offset index of the simulation model meets the preset requirements.

[0008] Based on the cross-sectional diameter of the coke filling in each electrode well in the simulation model output by the iteration and the current overflow density data of the simulation model, the uniformity of the overflow density of the vertical grounding electrode is obtained.

[0009] The uniformity of the overflow density of the vertical grounding electrode is evaluated based on the uniformity of the overflow density of the vertical grounding electrode and the preset judgment range of the uniformity of the overflow density of the vertical grounding electrode.

[0010] Understandably, this invention first constructs a simulation model of the vertical grounding electrode, then iteratively updates the cross-sectional diameter of the coke filling in each electrode well in the simulation model to obtain the overflow density offset index that meets the requirements. By constructing a simulation model of the vertical grounding electrode and simulating the data, a theoretical value for the uniform control of the overflow density of the vertical grounding electrode is obtained, and a more accurate theoretical value is obtained through iterative updates, providing a more accurate theoretical reference for the subsequent actual control of the vertical grounding electrode. Finally, based on the current overflow density data of the obtained simulation model, combined with the actual measured current overflow density of each feeder rod of the vertical grounding electrode, the uniformity of the overflow density of the vertical grounding electrode is calculated. By combining theoretical values ​​with actual values, the evaluation of the uniformity of the overflow density of the vertical grounding electrode is more accurate, thereby better controlling the uniformity of the overflow density of the vertical grounding electrode, avoiding the severe heating of the feeder rod of the vertical grounding electrode due to the non-uniformity of the overflow density, reducing its service life, and improving the operational stability and safety of the DC transmission system.

[0011] As a preferred embodiment, the step of constructing a simulation model of the vertical grounding electrode based on the acquired equipment data and environmental data of the vertical grounding electrode specifically involves:

[0012] Obtain the shape data of the vertical grounding electrode and construct a three-dimensional model of the vertical grounding electrode;

[0013] Based on the acquired equipment and environmental data of the vertical grounding electrode, generate the equipment and environmental data of the vertical grounding electrode simulation model;

[0014] Based on the equipment data, environmental data, and preset simulation model calculation range of the vertical grounding electrode simulation model, and combined with the three-dimensional model of the vertical grounding electrode, a simulation model of the vertical grounding electrode is constructed at a preset model scale.

[0015] By constructing a simulation model of the vertical grounding electrode, the overflow density data of the vertical grounding electrode can be simulated, providing a theoretical reference value for the actual control of the vertical grounding electrode.

[0016] As a preferred embodiment, the overflow density offset index of the simulation model is used to iteratively update the cross-sectional diameter of the coke filling in each electrode well in the simulation model. Based on the cross-sectional diameter of the coke filling in each electrode well in the current iteration, the current overflow density data and overflow density offset index of the simulation model are calculated and updated until the overflow density offset index of the simulation model meets the preset requirements. Specifically:

[0017] Obtain the cross-sectional diameter of the coke filling in each electrode well in the simulation model, and combine it with the operating data of each feed rod in the simulation model to calculate the current overflow density of the feed rod in each electrode well in the simulation model:

[0018]

[0019] Among them, I i Let d be the current in the feed rod of each electrode well, L be the length of the feed rod in the electrode well, and d be the current in the feed rod of each electrode well. i The diameter of the cross-sectional area of ​​the coke filling for each electrode well;

[0020] Based on the current overflow density of the feed rod in each electrode well, the average current overflow density of the vertical grounding electrode in the simulation model is obtained:

[0021]

[0022] Among them, I i Let d be the current in the feed rod of each electrode well, L be the length of the feed rod in the electrode well, and d be the current in the feed rod of each electrode well. i The cross-sectional diameter of the coke filling for each electrode well, and N is the number of feed rods in the electrode well;

[0023] Based on the current overflow density of the feed rod in each electrode well and the average current overflow density of the vertical grounding electrode, combined with the preset integral variable of the feed rod length, the overflow density offset index of the simulation model is calculated. After confirming that the overflow density offset index of the simulation model meets the preset requirements, the iterative update is completed.

[0024]

[0025] Where τ is the overflow density offset exponent of the simulation model, I is the vertical grounding electrode injection current, and d(L) is the integral variable of the feed rod length. i Let d be the current in the feed rod of each electrode well, L be the length of the feed rod in the electrode well, and d be the current in the feed rod of each electrode well. i The diameter of the coke cross-section for each electrode well is given by N, where N is the number of feed rods in the electrode well.

[0026] The overflow density offset index calculated by using the current overflow density and average current overflow density of the feed rod in each electrode well in the simulation model is more in line with reality and can more accurately express the degree of overflow density uniformity of the vertical grounding electrode.

[0027] As a preferred embodiment, confirming that the overflow density offset index of the simulation model meets the preset requirements and completing the iterative update specifically involves:

[0028] Obtain the preset overflow density offset index range. When the overflow density offset index of the simulation model is not within the preset overflow density offset index range, iteratively update the cross-sectional diameter of the filled coke for each electrode well.

[0029] Based on the diameter of the filled coke cross section of each electrode well in the current iteration, calculate and update the current overflow density data and overflow density offset index of the simulation model;

[0030] When the overflow density offset index of the simulation model is within the preset overflow density offset index range, the iterative update is completed, and the simulation model current overflow density data corresponding to the cross-sectional diameter of the filled coke of each electrode well in the current iteration is output.

[0031] More accurate theoretical values ​​were obtained through iterative updates of the simulation model of the vertical grounding electrode, providing a more accurate theoretical reference for the subsequent actual control of the vertical grounding electrode.

[0032] As a preferred embodiment, the process of obtaining the uniformity of overflow density of the vertical grounding electrode based on the cross-sectional diameter of the filled coke in each electrode well in the simulation model output by iteration and the current overflow density data of the simulation model is as follows:

[0033] Based on the cross-sectional diameter of the coke filling in each electrode well in the simulation model output by iteration, the cross-sectional diameter of the coke filling in each electrode well of the vertical grounding electrode corresponding to the simulation model is modified accordingly, and the current overflow density of the feed rod in each electrode well of the vertical grounding electrode corresponding to the modified simulation model is measured and calculated.

[0034] Based on the current overflow density of the feed rod in each electrode well of the vertical grounding electrode corresponding to the simulation model, and combined with the current overflow density data of the simulation model output by iteration, the uniformity of the overflow density of the vertical grounding electrode is calculated:

[0035]

[0036] Among them, M′ av(i) M represents the current overflow density of the feed rod in each electrode well of the vertical grounding electrode corresponding to the simulation model. av(i)This refers to the current overflow density of the feed rod in each electrode well in the current overflow density data of the simulation model. This represents the average current overflow density of the vertical grounding electrode in the current overflow density data of the simulation model.

[0037] By combining the theoretical values ​​obtained from the simulation model with the overflow density data obtained from the actual vertical grounding electrode corresponding to the simulation model, the uniformity of the overflow density of the vertical grounding electrode is more accurate and in line with reality, and can better evaluate the uniformity of the overflow density of the vertical grounding electrode.

[0038] As a preferred embodiment, the evaluation of the overflow density uniformity of the vertical grounding electrode is based on the uniformity matching degree of the overflow density of the vertical grounding electrode, combined with a preset judgment range for the uniformity matching degree of the overflow density of the vertical grounding electrode, specifically includes:

[0039] Obtain a preset judgment range for the uniformity of overflow density of vertical grounding electrode, and determine whether the uniformity of overflow density of vertical grounding electrode is within the preset judgment range for the uniformity of overflow density of vertical grounding electrode.

[0040] When the overflow density uniformity of the vertical grounding electrode is within the preset overflow density uniformity judgment range of the vertical grounding electrode, the vertical grounding electrode is adjusted accordingly based on the simulation data of the simulation model.

[0041] When the overflow density uniformity of the vertical grounding electrode is not within the preset overflow density uniformity judgment range of the vertical grounding electrode, the soil resistivity of the vertical grounding electrode is measured, and the vertical grounding electrode layout scheme is optimized according to the simulation model.

[0042] By setting a predefined range for judging the uniformity of overflow density of vertical grounding electrodes, the judgment of the uniformity of overflow density of vertical grounding electrodes can be made more in line with the actual application of electrical engineering.

[0043] Accordingly, this invention provides a vertical grounding electrode overflow density uniformity evaluation device, including: a simulation model construction module, an overflow density offset index iterative update module, an overflow density uniformity fit solution module, and an overflow density uniformity evaluation module.

[0044] The simulation model building module is used to build a simulation model of the vertical grounding electrode based on the acquired equipment data and environmental data.

[0045] The overflow density offset index iterative update module is used to iteratively update the cross-sectional diameter of the coke filling in each electrode well in the simulation model according to the overflow density offset index of the simulation model. Based on the cross-sectional diameter of the coke filling in each electrode well in the current iteration, the module calculates and updates the current overflow density data and overflow density offset index of the simulation model until the overflow density offset index of the simulation model meets the preset requirements.

[0046] The overflow density uniformity matching module is used to obtain the overflow density uniformity matching of the vertical grounding electrode based on the cross-sectional diameter of the filled coke in each electrode well in the simulation model output by iteration and the current overflow density data of the simulation model.

[0047] The overflow density uniformity assessment module is used to assess the overflow density uniformity of the vertical grounding electrode based on the overflow density uniformity matching degree of the vertical grounding electrode, combined with the preset vertical grounding electrode overflow density uniformity matching degree judgment range.

[0048] As a preferred embodiment, the simulation model construction module includes: a simulation model construction unit;

[0049] The simulation model building unit is used to obtain the shape data of the vertical grounding electrode and build a three-dimensional model of the vertical grounding electrode.

[0050] Based on the acquired equipment and environmental data of the vertical grounding electrode, generate the equipment and environmental data of the vertical grounding electrode simulation model;

[0051] Based on the equipment data, environmental data, and preset simulation model calculation range of the vertical grounding electrode simulation model, and combined with the three-dimensional model of the vertical grounding electrode, a simulation model of the vertical grounding electrode is constructed at a preset model scale.

[0052] As a preferred embodiment, the overflow density offset index iterative update module includes: an overflow density offset index iterative update unit;

[0053] The overflow density offset exponential iterative update unit is used to obtain the cross-sectional diameter of the filled coke in each electrode well in the simulation model, and, combined with the working data of each feed rod in the simulation model, calculate the current overflow density of the feed rod in each electrode well in the simulation model:

[0054]

[0055] Among them, I i Let d be the current in the feed rod of each electrode well, L be the length of the feed rod in the electrode well, and d be the current in the feed rod of each electrode well. i The diameter of the cross-sectional area of ​​the coke filling for each electrode well;

[0056] Based on the current overflow density of the feed rod in each electrode well, the average current overflow density of the vertical grounding electrode in the simulation model is obtained:

[0057]

[0058] Among them, I i Let d be the current in the feed rod of each electrode well, L be the length of the feed rod in the electrode well, and d be the current in the feed rod of each electrode well. i The cross-sectional diameter of the coke filling for each electrode well, and N is the number of feed rods in the electrode well;

[0059] Based on the current overflow density of the feed rod in each electrode well and the average current overflow density of the vertical grounding electrode, combined with the preset integral variable of the feed rod length, the overflow density offset index of the simulation model is calculated. After confirming that the overflow density offset index of the simulation model meets the preset requirements, the iterative update is completed.

[0060]

[0061] Where τ is the overflow density offset exponent of the simulation model, I is the vertical grounding electrode injection current, and d(L) is the integral variable of the feed rod length. i Let d be the current in the feed rod of each electrode well, L be the length of the feed rod in the electrode well, and d be the current in the feed rod of each electrode well. i The diameter of the coke cross-section for each electrode well is given by N, where N is the number of feed rods in the electrode well.

[0062] As a preferred embodiment, the overflow density offset index iterative update unit includes: an overflow density offset index iterative update subunit;

[0063] The overflow density offset index iterative update subunit is used to obtain a preset overflow density offset index range. When the overflow density offset index of the simulation model is not within the preset overflow density offset index range, the diameter of the filled coke cross section of each electrode well is iteratively updated.

[0064] Based on the diameter of the filled coke cross section of each electrode well in the current iteration, calculate and update the current overflow density data and overflow density offset index of the simulation model;

[0065] When the overflow density offset index of the simulation model is within the preset overflow density offset index range, the iterative update is completed, and the simulation model current overflow density data corresponding to the cross-sectional diameter of the filled coke of each electrode well in the current iteration is output.

[0066] As a preferred embodiment, the overflow density uniformity matching degree solution module includes: an overflow density uniformity matching degree solution unit;

[0067] The overflow density uniformity matching degree solution unit is used to modify the cross-sectional diameter of the coke filling of each electrode well of the vertical grounding electrode corresponding to the simulation model according to the cross-sectional diameter of the coke filling of each electrode well in the simulation model output by iteration, and to measure and calculate the current overflow density of the feed rod in each electrode well of the vertical grounding electrode corresponding to the modified simulation model.

[0068] Based on the current overflow density of the feed rod in each electrode well of the vertical grounding electrode corresponding to the simulation model, and combined with the current overflow density data of the simulation model output by iteration, the uniformity of the overflow density of the vertical grounding electrode is calculated:

[0069]

[0070] Among them, M′ av(i) M represents the current overflow density of the feed rod in each electrode well of the vertical grounding electrode corresponding to the simulation model. av(i) This refers to the current overflow density of the feed rod in each electrode well in the current overflow density data of the simulation model. This represents the average current overflow density of the vertical grounding electrode in the current overflow density data of the simulation model.

[0071] As a preferred embodiment, the overflow density uniformity assessment module includes: an overflow density uniformity assessment unit;

[0072] The overflow density uniformity evaluation unit is used to obtain a preset overflow density uniformity matching degree judgment interval for vertical grounding electrodes, and to determine whether the overflow density uniformity matching degree of vertical grounding electrodes is within the preset overflow density uniformity matching degree judgment interval for vertical grounding electrodes.

[0073] When the overflow density uniformity of the vertical grounding electrode is within the preset overflow density uniformity judgment range of the vertical grounding electrode, the vertical grounding electrode is adjusted accordingly based on the simulation data of the simulation model.

[0074] When the overflow density uniformity of the vertical grounding electrode is not within the preset overflow density uniformity judgment range of the vertical grounding electrode, the soil resistivity of the vertical grounding electrode is measured, and the vertical grounding electrode layout scheme is optimized according to the simulation model.

[0075] Accordingly, this invention provides a vertical grounding electrode overflow density uniformity evaluation system, including: a DC current generation module, an electrode well module, a cable module, a data recording module, a ground module, and a vertical grounding electrode overflow density uniformity evaluation device as described above.

[0076] The DC current generating module includes: an AC power generator, a rectifier, a disconnecting switch, and a busbar;

[0077] The electrode well module includes: an electrode feed rod and electrode well filling coke;

[0078] The cable module includes: electrode shunt current and current-conducting main cable;

[0079] The data recording module includes: a signal recorder and a current measuring instrument;

[0080] The AC power generator and rectifier are directly connected; one end of the main current cable is connected to the busbar and the other end is connected to the electrode shunt cable; the electrode shunt cable is connected to the electrode feed rod; the electrode feed rod is buried deep inside the coke-filled electrode well; the current measuring device is arranged on the electrode shunt cable above each electrode feed rod; the signal recorder and the current measuring device are connected through a test signal line. Attached Figure Description

[0081] Figure 1 : A flowchart illustrating the steps of a method for evaluating the uniformity of overflow current density of a vertical grounding electrode, as provided in an embodiment of the present invention;

[0082] Figure 2 : A flowchart illustrating the steps of another method for evaluating the uniformity of overflow current density of a vertical grounding electrode provided in an embodiment of the present invention;

[0083] Figure 3 : A schematic diagram of the structure of a vertical grounding electrode overflow density uniformity evaluation device provided in an embodiment of the present invention;

[0084] Figure 4 : A schematic diagram of a vertical grounding electrode overflow density uniformity evaluation system provided in an embodiment of the present invention;

[0085] Figure 5 : A schematic diagram of the module connection in a vertical grounding electrode overflow density uniformity evaluation system provided in an embodiment of the present invention;

[0086] Figure 6 : A schematic diagram of the module connection in another vertical grounding electrode overflow density uniformity evaluation system provided in an embodiment of the present invention. Detailed Implementation

[0087] 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.

[0088] Example 1

[0089] Please refer to Figure 1 The flowchart of a method for evaluating the uniformity of overflow current density of a vertical grounding electrode provided in an embodiment of the present invention includes steps S1-S4.

[0090] Step S1: Based on the obtained equipment data and environmental data of the vertical grounding electrode, construct a simulation model of the vertical grounding electrode.

[0091] In this embodiment, the step of constructing a simulation model of the vertical grounding electrode based on the acquired equipment data and environmental data specifically involves:

[0092] Obtain the shape data of the vertical grounding electrode and construct a three-dimensional model of the vertical grounding electrode;

[0093] Based on the acquired equipment and environmental data of the vertical grounding electrode, generate the equipment and environmental data of the vertical grounding electrode simulation model;

[0094] Based on the equipment data, environmental data, and preset simulation model calculation range of the vertical grounding electrode simulation model, and combined with the three-dimensional model of the vertical grounding electrode, a simulation model of the vertical grounding electrode is constructed at a preset model scale.

[0095] In one optional embodiment, a three-dimensional model of the vertical grounding electrode is constructed in the 3D software AutoCAD based on the acquired vertical grounding electrode shape data; the equipment and environmental data of the vertical grounding electrode are set in the simulation calculation software CDEGS based on the acquired equipment and environmental data of the vertical grounding electrode, wherein setting the equipment and environmental data of the vertical grounding electrode in the simulation calculation software CDEGS includes: setting the soil resistivity, setting the characteristics of the grounding electrode feed rod, filling coke, and cable materials; finally, the three-dimensional model of the vertical grounding electrode is input into the simulation calculation software CDEGS, and a simulation model of the vertical grounding electrode is constructed proportionally according to the set simulation model calculation range.

[0096] It should be noted that the aforementioned 3D software specifically refers to application software used to construct 3D models, including but not limited to AutoCAD, CATIA, and Inventor; the aforementioned simulation calculation software specifically refers to electromagnetic field simulation software used to quickly and accurately simulate complex electromagnetic field distributions, grounding system structures, and soil properties in power systems, including but not limited to CDEGS, ANSYS Maxwell, HFSS, and FEMM; the preset model scale can be determined by those skilled in the art based on historical experimental data and actual conditions, and of course, it can also be set based on the experience of those skilled in the art.

[0097] Step S2: Based on the overflow density offset index of the simulation model, iteratively update the cross-sectional diameter of the coke filling in each electrode well in the simulation model. Based on the cross-sectional diameter of the coke filling in each electrode well in the current iteration, calculate and update the current overflow density data and overflow density offset index of the simulation model until the overflow density offset index of the simulation model meets the preset requirements.

[0098] In this embodiment, the overflow density offset index of the simulation model is used to iteratively update the cross-sectional diameter of the coke filling in each electrode well in the simulation model. Based on the cross-sectional diameter of the coke filling in each electrode well in the current iteration, the current overflow density data and overflow density offset index of the simulation model are calculated and updated until the overflow density offset index of the simulation model meets the preset requirements. Specifically:

[0099] Obtain the cross-sectional diameter of the coke filling in each electrode well in the simulation model, and combine it with the operating data of each feed rod in the simulation model to calculate the current overflow density of the feed rod in each electrode well in the simulation model:

[0100]

[0101] Among them, I i Let d be the current in the feed rod of each electrode well, L be the length of the feed rod in the electrode well, and d be the current in the feed rod of each electrode well. i The diameter of the cross-sectional area of ​​the coke filling for each electrode well;

[0102] Based on the current overflow density of the feed rod in each electrode well, the average current overflow density of the vertical grounding electrode in the simulation model is obtained:

[0103]

[0104] Among them, I i Let d be the current in the feed rod of each electrode well, L be the length of the feed rod in the electrode well, and d be the current in the feed rod of each electrode well. i The cross-sectional diameter of the coke filling for each electrode well, and N is the number of feed rods in the electrode well;

[0105] Based on the current overflow density of the feed rod in each electrode well and the average current overflow density of the vertical grounding electrode, combined with the preset integral variable of the feed rod length, the overflow density offset index of the simulation model is calculated. After confirming that the overflow density offset index of the simulation model meets the preset requirements, the iterative update is completed.

[0106]

[0107] Where τ is the overflow density offset exponent of the simulation model, I is the vertical grounding electrode injection current, and d(L) is the integral variable of the feed rod length. iLet d be the current in the feed rod of each electrode well, L be the length of the feed rod in the electrode well, and d be the current in the feed rod of each electrode well. i The diameter of the coke cross-section for each electrode well is given by N, where N is the number of feed rods in the electrode well.

[0108] In this embodiment, confirming that the overflow density offset index of the simulation model meets the preset requirements and completing the iterative update specifically involves:

[0109] Obtain the preset overflow density offset index range. When the overflow density offset index of the simulation model is not within the preset overflow density offset index range, iteratively update the cross-sectional diameter of the filled coke for each electrode well.

[0110] Based on the diameter of the filled coke cross section of each electrode well in the current iteration, calculate and update the current overflow density data and overflow density offset index of the simulation model;

[0111] When the overflow density offset index of the simulation model is within the preset overflow density offset index range, the iterative update is completed, and the simulation model current overflow density data corresponding to the cross-sectional diameter of the filled coke of each electrode well in the current iteration is output.

[0112] In one optional embodiment, based on the obtained overflow density offset index range of 0 to 0.5 and 0.5 to 1, when the overflow density offset index of the simulation model is greater than or equal to 0 and less than or equal to 0.5, it indicates that the overflow density offset index of the simulation model meets the preset requirements, and the overflow density uniformity of each electrode well feed rod meets the requirements, thus completing the iterative update; when the overflow density offset index of the simulation model is greater than 0.5 and less than 1, it indicates that the overflow density offset index of the simulation model does not meet the preset requirements, and the overflow density uniformity of each electrode well feed rod does not meet the requirements.

[0113] It should be noted that the overflow density offset index range 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 overflow density offset index range is set to 0 to 0.5 and 0.5 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.

[0114] In an optional embodiment, when the overflow density offset index of the simulation model is not within the preset overflow density offset index range, the current overflow density of the feed rod in each electrode well in the simulation model and the average current overflow density are compared sequentially. When the current overflow density of the feed rod is greater than the average current overflow density, the diameter of the coke cross-section corresponding to the feed rod is increased by 0.1m. When the current overflow density of the feed rod is less than the average current overflow density, the diameter of the coke cross-section corresponding to the feed rod is decreased by 0.1m. The overflow density offset index is updated according to the updated coke cross-section diameter. If the overflow density offset index is still not within the preset overflow density offset index range, the adjustment value of the previous coke cross-section diameter is halved and the coke cross-section diameter is updated, and the overflow density offset index is calculated again. The above process is repeated until the overflow density offset index of the simulation model is within the preset overflow density offset index range.

[0115] Step S3: Based on the cross-sectional diameter of the coke filling in each electrode well in the simulation model output by the iteration and the current overflow density data of the simulation model, obtain the uniformity of the overflow density of the vertical grounding electrode.

[0116] In this embodiment, the process of obtaining the uniformity of overflow density of the vertical grounding electrode based on the cross-sectional diameter of the coke filling in each electrode well in the simulation model output by iteration and the current overflow density data of the simulation model is as follows:

[0117] Based on the cross-sectional diameter of the coke filling in each electrode well in the simulation model output by iteration, the cross-sectional diameter of the coke filling in each electrode well of the vertical grounding electrode corresponding to the simulation model is modified accordingly, and the current overflow density of the feed rod in each electrode well of the vertical grounding electrode corresponding to the modified simulation model is measured and calculated.

[0118] Based on the current overflow density of the feed rod in each electrode well of the vertical grounding electrode corresponding to the simulation model, and combined with the current overflow density data of the simulation model output by iteration, the uniformity of the overflow density of the vertical grounding electrode is calculated:

[0119]

[0120] Among them, M′ av(i) M represents the current overflow density of the feed rod in each electrode well of the vertical grounding electrode corresponding to the simulation model. av(i) This refers to the current overflow density of the feed rod in each electrode well in the current overflow density data of the simulation model. This represents the average current overflow density of the vertical grounding electrode in the current overflow density data of the simulation model.

[0121] Step S4: Based on the uniformity of the overflow density of the vertical grounding electrode and the preset judgment range of the uniformity of the overflow density of the vertical grounding electrode, evaluate the uniformity of the overflow density of the vertical grounding electrode.

[0122] In this embodiment, the evaluation of the overflow density uniformity of the vertical grounding electrode based on the uniformity matching degree of the overflow density of the vertical grounding electrode, combined with a preset judgment range for the uniformity matching degree of the overflow density of the vertical grounding electrode, specifically involves:

[0123] Obtain a preset judgment range for the uniformity of overflow density of vertical grounding electrode, and determine whether the uniformity of overflow density of vertical grounding electrode is within the preset judgment range for the uniformity of overflow density of vertical grounding electrode.

[0124] When the overflow density uniformity of the vertical grounding electrode is within the preset overflow density uniformity judgment range of the vertical grounding electrode, the vertical grounding electrode is adjusted accordingly based on the simulation data of the simulation model.

[0125] When the overflow density uniformity of the vertical grounding electrode is not within the preset overflow density uniformity judgment range of the vertical grounding electrode, the soil resistivity of the vertical grounding electrode is measured, and the vertical grounding electrode layout scheme is optimized according to the simulation model.

[0126] In one optional embodiment, the overflow density uniformity matching degree judgment range is set to 0 to 0.8 and 0.8 to 1. When the overflow density uniformity matching degree of the vertical grounding electrode is greater than or equal to 0 and less than or equal to 0.8, it indicates that the overflow density uniformity matching degree of the vertical grounding electrode meets the preset requirements, the simulation model and the actual measured overflow density uniformity matching degree are high, and it can meet the practical application requirements; when the overflow density uniformity matching degree of the vertical grounding electrode is greater than 0.8 and less than 1, it indicates that the overflow density uniformity matching degree of the vertical grounding electrode does not meet the preset requirements, the simulation model and the actual measured overflow density uniformity matching degree are low, and it cannot meet the practical application requirements.

[0127] It should be noted that the overflow density homogenization consistency judgment range 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 overflow density homogenization consistency judgment range is set to 0 to 0.8 and 0.8 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 protection scope of this invention.

[0128] Please refer to Figure 2The following is a flowchart of another method for evaluating the uniformity of overflow current density of a vertical grounding electrode, provided by an embodiment of the present invention. First, a vertical grounding electrode model is established proportionally. The current overflow density of the electrode feed rod is calculated through simulation, and the offset index of the simulated overflow current density of the vertical grounding electrode is calculated. The offset index of the simulated overflow current density of the vertical grounding electrode is then determined. When the uniformity of the simulated overflow current density is low, the diameter of the filler coke in the simulation model is adjusted, and the above steps are repeated to calculate the offset index of the simulated overflow current density of the vertical grounding electrode until the uniformity of the simulated overflow current density is high. When the uniformity of the simulated overflow current density is high, the measured current overflow density data under the filler coke diameter corresponding to the high uniformity of the simulated overflow current density is tested using an actual test system. The overflow density uniformity coefficient is then calculated based on this data, and the applicability of the method is determined according to the overflow density uniformity coefficient.

[0129] This embodiment first constructs a simulation model of the vertical grounding electrode, then iteratively updates the cross-sectional diameter of the coke filling in each electrode well in the simulation model to obtain the overflow density offset index that meets the requirements. By constructing a simulation model of the vertical grounding electrode and simulating the data, a theoretical value for the uniform control of the overflow density of the vertical grounding electrode is obtained. Through iterative updates, a more accurate theoretical value is obtained, providing a more accurate theoretical reference for the subsequent actual control of the vertical grounding electrode. Finally, based on the current overflow density data obtained from the simulation model, combined with the actual measured current overflow density of each feeder rod of the vertical grounding electrode, the uniformity of the overflow density of the vertical grounding electrode is calculated. By combining theoretical values ​​with actual values, the evaluation of the uniformity of the overflow density of the vertical grounding electrode is more accurate, thereby better controlling the uniformity of the overflow density of the vertical grounding electrode. This avoids the uneven overflow density of the vertical grounding electrode causing severe overheating of the feeder rod, reducing its service life, and improving the operational stability and safety of the DC transmission system.

[0130] Example 2

[0131] Please refer to Figure 3 The present invention provides a schematic diagram of a vertical grounding electrode overflow density uniformity evaluation device, including: a simulation model construction module 601, an overflow density offset index iterative update module 602, an overflow density uniformity matching degree solution module 603, and an overflow density uniformity evaluation module 604.

[0132] The simulation model building module 601 is used to build a simulation model of the vertical grounding electrode based on the acquired equipment data and environmental data of the vertical grounding electrode.

[0133] In this embodiment, the simulation model construction module 601 includes: a simulation model construction unit;

[0134] The simulation model building unit is used to obtain the shape data of the vertical grounding electrode and build a three-dimensional model of the vertical grounding electrode.

[0135] Based on the acquired equipment and environmental data of the vertical grounding electrode, generate the equipment and environmental data of the vertical grounding electrode simulation model;

[0136] Based on the equipment data, environmental data, and preset simulation model calculation range of the vertical grounding electrode simulation model, and combined with the three-dimensional model of the vertical grounding electrode, a simulation model of the vertical grounding electrode is constructed at a preset model scale.

[0137] The overflow density offset index iterative update module 602 is used to iteratively update the cross-sectional diameter of the coke filling in each electrode well in the simulation model according to the overflow density offset index of the simulation model. Based on the cross-sectional diameter of the coke filling in each electrode well in the current iteration, it calculates and updates the current overflow density data and overflow density offset index of the simulation model until the overflow density offset index of the simulation model meets the preset requirements.

[0138] In this embodiment, the overflow density offset index iterative update module 602 includes: an overflow density offset index iterative update unit;

[0139] The overflow density offset exponential iterative update unit is used to obtain the cross-sectional diameter of the filled coke in each electrode well in the simulation model, and, combined with the working data of each feed rod in the simulation model, calculate the current overflow density of the feed rod in each electrode well in the simulation model:

[0140]

[0141] Among them, I i Let d be the current in the feed rod of each electrode well, L be the length of the feed rod in the electrode well, and d be the current in the feed rod of each electrode well. i The diameter of the cross-sectional area of ​​the coke filling for each electrode well;

[0142] Based on the current overflow density of the feed rod in each electrode well, the average current overflow density of the vertical grounding electrode in the simulation model is obtained:

[0143]

[0144] Among them, I i Let d be the current in the feed rod of each electrode well, L be the length of the feed rod in the electrode well, and d be the current in the feed rod of each electrode well. i The cross-sectional diameter of the coke filling for each electrode well, and N is the number of feed rods in the electrode well;

[0145] Based on the current overflow density of the feed rod in each electrode well and the average current overflow density of the vertical grounding electrode, combined with the preset integral variable of the feed rod length, the overflow density offset index of the simulation model is calculated. After confirming that the overflow density offset index of the simulation model meets the preset requirements, the iterative update is completed.

[0146]

[0147] Where τ is the overflow density offset exponent of the simulation model, I is the vertical grounding electrode injection current, and d(L) is the integral variable of the feed rod length. i Let d be the current in the feed rod of each electrode well, L be the length of the feed rod in the electrode well, and d be the current in the feed rod of each electrode well. i The diameter of the coke cross-section for each electrode well is given by N, where N is the number of feed rods in the electrode well.

[0148] In this embodiment, the overflow density offset index iterative update unit includes: an overflow density offset index iterative update subunit;

[0149] The overflow density offset index iterative update subunit is used to obtain a preset overflow density offset index range. When the overflow density offset index of the simulation model is not within the preset overflow density offset index range, the diameter of the filled coke cross section of each electrode well is iteratively updated.

[0150] Based on the diameter of the filled coke cross section of each electrode well in the current iteration, calculate and update the current overflow density data and overflow density offset index of the simulation model;

[0151] When the overflow density offset index of the simulation model is within the preset overflow density offset index range, the iterative update is completed, and the simulation model current overflow density data corresponding to the cross-sectional diameter of the filled coke of each electrode well in the current iteration is output.

[0152] The overflow density uniformity matching module 603 is used to obtain the overflow density uniformity matching of the vertical grounding electrode based on the cross-sectional diameter of the filled coke of each electrode well in the simulation model output by iteration and the current overflow density data of the simulation model.

[0153] In this embodiment, the overflow density uniformity matching degree solution module 603 includes: an overflow density uniformity matching degree solution unit;

[0154] The overflow density uniformity matching degree solution unit is used to modify the cross-sectional diameter of the coke filling of each electrode well of the vertical grounding electrode corresponding to the simulation model according to the cross-sectional diameter of the coke filling of each electrode well in the simulation model output by iteration, and to measure and calculate the current overflow density of the feed rod in each electrode well of the vertical grounding electrode corresponding to the modified simulation model.

[0155] Based on the current overflow density of the feed rod in each electrode well of the vertical grounding electrode corresponding to the simulation model, and combined with the current overflow density data of the simulation model output by iteration, the uniformity of the overflow density of the vertical grounding electrode is calculated:

[0156]

[0157] Among them, M′ av(i) M represents the current overflow density of the feed rod in each electrode well of the vertical grounding electrode corresponding to the simulation model. aν(i) This refers to the current overflow density of the feed rod in each electrode well in the current overflow density data of the simulation model. This represents the average current overflow density of the vertical grounding electrode in the current overflow density data of the simulation model.

[0158] The overflow density uniformity evaluation module 604 is used to evaluate the overflow density uniformity of the vertical grounding electrode based on the overflow density uniformity matching degree of the vertical grounding electrode and in combination with the preset vertical grounding electrode overflow density uniformity matching degree judgment range.

[0159] In this embodiment, the overflow density homogenization evaluation module 604 includes: an overflow density homogenization evaluation unit;

[0160] The overflow density uniformity evaluation unit is used to obtain a preset overflow density uniformity matching degree judgment interval for vertical grounding electrodes, and to determine whether the overflow density uniformity matching degree of vertical grounding electrodes is within the preset overflow density uniformity matching degree judgment interval for vertical grounding electrodes.

[0161] When the overflow density uniformity of the vertical grounding electrode is within the preset overflow density uniformity judgment range of the vertical grounding electrode, the vertical grounding electrode is adjusted accordingly based on the simulation data of the simulation model.

[0162] When the overflow density uniformity of the vertical grounding electrode is not within the preset overflow density uniformity judgment range of the vertical grounding electrode, the soil resistivity of the vertical grounding electrode is measured, and the vertical grounding electrode layout scheme is optimized according to the simulation model.

[0163] This embodiment first constructs a simulation model of the vertical grounding electrode, then iteratively updates the cross-sectional diameter of the coke filling in each electrode well in the simulation model to obtain the overflow density offset index that meets the requirements. By constructing a simulation model of the vertical grounding electrode and simulating the data, a theoretical value for the uniform control of the overflow density of the vertical grounding electrode is obtained. Through iterative updates, a more accurate theoretical value is obtained, providing a more accurate theoretical reference for the subsequent actual control of the vertical grounding electrode. Finally, based on the current overflow density data obtained from the simulation model, combined with the actual measured current overflow density of each feeder rod of the vertical grounding electrode, the uniformity of the overflow density of the vertical grounding electrode is calculated. By combining theoretical values ​​with actual values, the evaluation of the uniformity of the overflow density of the vertical grounding electrode is more accurate, thereby better controlling the uniformity of the overflow density of the vertical grounding electrode. This avoids the uneven overflow density of the vertical grounding electrode causing severe overheating of the feeder rod, reducing its service life, and improving the operational stability and safety of the DC transmission system.

[0164] Example 3

[0165] Please refer to Figure 4 The present invention provides a structural schematic diagram of a vertical grounding electrode overflow density uniformity evaluation system, including: a DC current generation module 1, an electrode well module 2, a cable module 3, a data recording module 4, a ground module 5, and a vertical grounding electrode overflow density uniformity evaluation device 6 as described in Embodiment 2.

[0166] The DC current generating module 1 includes: an AC power generator 101, a rectifier 102, a disconnecting switch 103, and a busbar 104;

[0167] The electrode well module 2 includes: an electrode feed rod 201 and an electrode well filling coke 202;

[0168] The cable module 3 includes: an electrode shunt cable 301 and a main current-conducting cable 302;

[0169] The data recording module 4 includes: a signal recorder 401 and a current measuring instrument 402;

[0170] The AC power generator 101 and rectifier 102 are directly connected; one end of the main current-conducting cable 302 is connected to the busbar 104, and the other end is connected to the electrode shunt cable 301; the electrode shunt cable 301 is connected to the electrode feed rod 201; the electrode feed rod 201 is buried deep inside the electrode well filled with coke 202; the current measuring instrument 402 is arranged above the electrode shunt cable 301 of each electrode feed rod; the signal recorder 401 and the current measuring instrument 402 are connected through a test signal line.

[0171] In one alternative embodiment, please refer to Figure 5 This is a schematic diagram of the module connections in a vertical grounding electrode overflow density uniformity evaluation system provided by an embodiment of the present invention. Specifically, 1 is a DC current generating module, 101 is an AC power generator in the DC current generating module, 102 is a rectifier in the DC current generating module, 103 is an isolating switch in the DC current generating module, 104 is a busbar in the DC current generating module, 201 is an electrode feed rod in the electrode well module, 301 is an electrode shunt cable in the cable module, and 302 is a main current-conducting cable in the cable module. The AC power generator 101, rectifier 102, and isolating switch 103 are connected sequentially. The isolating switch 103 is connected to the busbar 104, the busbar 104 is connected to the main current-conducting cable 302, the main current-conducting cable 302 is connected to the electrode shunt cable 301, and the electrode shunt cable 301 is connected to the electrode feed rod 201.

[0172] In one alternative embodiment, please refer to Figure 6 This is a schematic diagram of the module connections in another vertical grounding electrode overflow density uniformity evaluation system provided by an embodiment of the present invention. Specifically, 1 is a DC current generating module, 201 is an electrode feed rod in the electrode well module, 202 is coke filling in the electrode well module, 301 is an electrode shunt cable in the cable module, 302 is a main current-conducting cable in the cable module, 401 is a signal recorder in the data recording module, 402 is a current measuring instrument in the data recording module, and 5 is a ground module; wherein, each electrode shunt cable 301 and Electrode feed rods 201 are connected; the electrode feed rods 201 are buried inside the coke filling 202 of the electrode well, and the current measuring instrument 402 is arranged above the electrode shunt cable 301 above each electrode feed rod 201; when the DC current generating module 1 generates DC current, the electrode feed rods 201 in each electrode well will be distributed with different DC currents, and then flow through the coke filling 202 of the electrode well to the ground module 5. The current measuring instrument 402 monitors the current value flowing into each electrode feed rod 201, and the signal recorder 401 records the current measurement value in real time.

[0173] In this embodiment, a DC current is generated by a DC current generating module, transmitted to the electrode well module via a cable module, and the current data is measured and recorded by a data recording module. Finally, the degree of uniformity of the overflow density of the vertical grounding electrode is evaluated by a vertical grounding electrode overflow density uniformity evaluation device.

[0174] In summary, this embodiment generates DC current through a DC current generation module, transmits it to the electrode well module via a cable module, measures and records the current data through a data recording module, and finally evaluates the degree of uniformity of the overflow density of the vertical grounding electrode through a vertical grounding electrode overflow density uniformity evaluation device. Specifically, the vertical grounding electrode overflow density uniformity evaluation device first constructs a simulation model of the vertical grounding electrode, then iteratively updates the cross-sectional diameter of the coke filling in each electrode well in the simulation model to obtain the overflow density offset index that meets the requirements. By constructing a simulation model of the vertical grounding electrode and simulating the data, the theoretical value of the vertical grounding electrode overflow density uniformity control is obtained, and through iterative... The updated model yielded more accurate theoretical values, providing a more precise theoretical reference for subsequent actual control of the vertical grounding electrode. Finally, based on the current overflow density data from the simulation model and the actual measured current overflow density of each feeder rod of the vertical grounding electrode, the uniformity of the overflow density of the vertical grounding electrode was calculated. By combining theoretical and actual values, the evaluation of the uniformity of the overflow density of the vertical grounding electrode became more accurate, thus enabling better control of the uniformity of the overflow density of the vertical grounding electrode. This avoids the uneven overflow density of the vertical grounding electrode causing severe overheating of the feeder rod, reducing its service life, and improving the operational stability and safety of the DC transmission system.

[0175] 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 evaluating the uniformity of overflow current density at vertical grounding electrodes, characterized in that, include: Based on the obtained equipment and environmental data of the vertical grounding electrode, a simulation model of the vertical grounding electrode is constructed. Based on the overflow density offset index of the simulation model, the diameter of the coke-filled cross-section of each electrode well in the simulation model is iteratively updated. Based on the current overflow density data and overflow density offset index of each electrode well in the current iteration, the overflow density offset index of the simulation model is calculated and updated until it meets the preset requirements; specifically: Obtain the cross-sectional diameter of the coke filling in each electrode well in the simulation model, and combine it with the operating data of each feed rod in the simulation model to calculate the current overflow density of the feed rod in each electrode well in the simulation model: ， in, The current in the feed rod in each electrode well, The length of the feed rod in the electrode well. The diameter of the cross-sectional area of ​​the coke filling for each electrode well; Based on the current overflow density of the feed rod in each electrode well, the average current overflow density of the vertical grounding electrode in the simulation model is obtained: , in, The number of feed rods in the electrode well; Based on the current overflow density of the feed rod in each electrode well and the average current overflow density of the vertical grounding electrode, combined with the integral variable of the preset feed rod length, the overflow density offset index of the simulation model is calculated, and a preset overflow density offset index range is obtained. When the overflow density offset index of the simulation model is not within the preset overflow density offset index range, the diameter of the coke-filled cross section of each electrode well is iteratively updated. Based on the diameter of the coke-filled cross section of each electrode well in the current iteration, the current overflow density data and overflow density offset index of the simulation model are calculated and updated. When the overflow density offset index of the simulation model is within the preset overflow density offset index range, the iterative update is completed, and the current overflow density data of the simulation model corresponding to the diameter of the coke-filled cross section of each electrode well in the current iteration is output. ， in, The overflow density offset index of the simulation model. Inject current into the vertical grounding electrode. The integral variable is the length of the feed rod; Based on the cross-sectional diameter of the coke filling in each electrode well in the simulation model output by the iteration and the current overflow density data of the simulation model, the uniformity of the overflow density of the vertical grounding electrode is obtained. Specifically, based on the cross-sectional diameter of the coke filling in each electrode well in the simulation model output by the iteration, the cross-sectional diameter of the coke filling in each electrode well of the vertical grounding electrode corresponding to the simulation model is modified accordingly, and the current overflow density of the feed rod in each electrode well of the vertical grounding electrode corresponding to the modified simulation model is measured and calculated; based on the current overflow density of the feed rod in each electrode well of the vertical grounding electrode corresponding to the simulation model, combined with the current overflow density data of the simulation model output by the iteration, the uniformity of the overflow density of the vertical grounding electrode is calculated. ， in, This represents the current overflow density of the feed rod in each electrode well of the vertical grounding electrode corresponding to the simulation model. This refers to the current overflow density of the feed rod in each electrode well in the current overflow density data of the simulation model. The average current overflow density of the vertical ground electrode in the current overflow density data of the simulation model; The uniformity of the overflow density of the vertical grounding electrode is evaluated based on the uniformity of the overflow density of the vertical grounding electrode and the preset judgment range of the uniformity of the overflow density of the vertical grounding electrode.

2. The method for evaluating the uniformity of overflow current density of a vertical grounding electrode as described in claim 1, characterized in that, The step of constructing a simulation model of the vertical grounding electrode based on the acquired equipment and environmental data is as follows: Obtain the shape data of the vertical grounding electrode and construct a three-dimensional model of the vertical grounding electrode; Based on the acquired equipment and environmental data of the vertical grounding electrode, generate the equipment and environmental data of the vertical grounding electrode simulation model; Based on the equipment data, environmental data, and preset simulation model calculation range of the vertical grounding electrode simulation model, and combined with the three-dimensional model of the vertical grounding electrode, a simulation model of the vertical grounding electrode is constructed at a preset model scale.

3. The method for evaluating the uniformity of overflow current density of a vertical grounding electrode as described in claim 1, characterized in that, The process of evaluating the uniformity of overflow density of the vertical grounding electrode based on the uniformity of overflow density of the vertical grounding electrode, combined with a preset judgment range for the uniformity of overflow density of the vertical grounding electrode, is as follows: Obtain a preset judgment range for the uniformity of overflow density of vertical grounding electrode, and determine whether the uniformity of overflow density of vertical grounding electrode is within the preset judgment range for the uniformity of overflow density of vertical grounding electrode. When the overflow density uniformity of the vertical grounding electrode is within the preset overflow density uniformity judgment range of the vertical grounding electrode, the vertical grounding electrode is adjusted accordingly based on the simulation data of the simulation model. When the overflow density uniformity of the vertical grounding electrode is not within the preset overflow density uniformity judgment range of the vertical grounding electrode, the soil resistivity of the vertical grounding electrode is measured, and the vertical grounding electrode layout scheme is optimized according to the simulation model.

4. A device for evaluating the uniformity of overflow current density at a vertical grounding electrode, characterized in that... ,include: The system includes a simulation model building module, an overflow density offset index iterative update module, an overflow density homogenization fit solution module, and an overflow density homogenization evaluation module. The simulation model building module is used to build a simulation model of the vertical grounding electrode based on the acquired equipment data and environmental data. The overflow density offset index iterative update module is used to iteratively update the cross-sectional diameter of the coke filling in each electrode well in the simulation model based on the overflow density offset index of the simulation model. Based on the cross-sectional diameter of the coke filling in each electrode well in the current iteration, it calculates and updates the current overflow density data and overflow density offset index of the simulation model until the overflow density offset index of the simulation model meets the preset requirements. The overflow density offset index iterative update module includes: an overflow density offset index iterative update unit; the overflow density offset index iterative update unit is used to obtain the cross-sectional diameter of the coke filling in each electrode well in the simulation model, and, combined with the working data of each feeder rod in the simulation model, calculate the current overflow density of the feeder rod in each electrode well of the simulation model. ， in, The current in the feed rod in each electrode well, The length of the feed rod in the electrode well. The diameter of the cross-sectional area of ​​the coke filling for each electrode well; Based on the current overflow density of the feed rod in each electrode well, the average current overflow density of the vertical grounding electrode in the simulation model is obtained: , in, The number of feed rods in the electrode well; Based on the current overflow density of the feed rod in each electrode well and the average current overflow density of the vertical grounding electrode, combined with the preset integral variable of the feed rod length, the overflow density offset index of the simulation model is calculated. After confirming that the overflow density offset index of the simulation model meets the preset requirements, the iterative update is completed. ， in, The overflow density offset index of the simulation model. Inject current into the vertical grounding electrode. The integral variable is the length of the feed rod; The overflow density offset index iterative update unit includes: an overflow density offset index iterative update subunit; the overflow density offset index iterative update subunit is used to obtain a preset overflow density offset index range; when the overflow density offset index of the simulation model is not within the preset overflow density offset index range, the diameter of the coke-filled cross section of each electrode well is iteratively updated; based on the diameter of the coke-filled cross section of each electrode well in the current iteration, the current overflow density data and overflow density offset index of the simulation model are calculated and updated; when the overflow density offset index of the simulation model is within the preset overflow density offset index range, the iterative update is completed, and the current overflow density data of the simulation model corresponding to the diameter of the coke-filled cross section of each electrode well in the current iteration is output; The overflow density uniformity matching module is used to obtain the overflow density uniformity matching degree of the vertical grounding electrode based on the cross-sectional diameter of the filled coke of each electrode well in the simulation model output by iteration and the current overflow density data of the simulation model. The overflow density uniformity matching degree solution module includes: an overflow density uniformity matching degree solution unit; the overflow density uniformity matching degree solution unit is used to modify the cross-sectional diameter of the filled coke of each electrode well of the vertical grounding electrode corresponding to the simulation model according to the cross-sectional diameter of the filled coke of each electrode well in the simulation model output by iteration, and to measure and calculate the current overflow density of the feed rod in each electrode well of the vertical grounding electrode corresponding to the modified simulation model; based on the current overflow density of the feed rod in each electrode well of the vertical grounding electrode corresponding to the simulation model, combined with the current overflow density data of the simulation model output by iteration, the overflow density uniformity matching degree of the vertical grounding electrode is calculated. ， in, This represents the current overflow density of the feed rod in each electrode well of the vertical grounding electrode corresponding to the simulation model. This refers to the current overflow density of the feed rod in each electrode well in the current overflow density data of the simulation model. The average current overflow density of the vertical ground electrode in the current overflow density data of the simulation model; The overflow density uniformity assessment module is used to assess the overflow density uniformity of the vertical grounding electrode based on the overflow density uniformity matching degree of the vertical grounding electrode, combined with the preset vertical grounding electrode overflow density uniformity matching degree judgment range.

5. The vertical grounding electrode overflow density uniformity evaluation device as described in claim 4, characterized in that, The simulation model construction module includes: a simulation model construction unit; The simulation model building unit is used to obtain the shape data of the vertical grounding electrode and build a three-dimensional model of the vertical grounding electrode. Based on the acquired equipment and environmental data of the vertical grounding electrode, generate the equipment and environmental data of the vertical grounding electrode simulation model; Based on the equipment data, environmental data, and preset simulation model calculation range of the vertical grounding electrode simulation model, and combined with the three-dimensional model of the vertical grounding electrode, a simulation model of the vertical grounding electrode is constructed at a preset model scale.

6. The vertical grounding electrode overflow current density uniformity evaluation device as described in claim 4, characterized in that, The overflow density homogenization assessment module includes: an overflow density homogenization assessment unit; The overflow density uniformity evaluation unit is used to obtain a preset overflow density uniformity matching degree judgment interval for vertical grounding electrodes, and to determine whether the overflow density uniformity matching degree of vertical grounding electrodes is within the preset overflow density uniformity matching degree judgment interval for vertical grounding electrodes. When the overflow density uniformity of the vertical grounding electrode is within the preset overflow density uniformity judgment range of the vertical grounding electrode, the vertical grounding electrode is adjusted accordingly based on the simulation data of the simulation model. When the overflow density uniformity of the vertical grounding electrode is not within the preset overflow density uniformity judgment range of the vertical grounding electrode, the soil resistivity of the vertical grounding electrode is measured, and the vertical grounding electrode layout scheme is optimized according to the simulation model.

7. A system for evaluating the uniformity of overflow current density at vertical grounding electrodes, characterized in that... ,include: A DC current generating module, an electrode well module, a cable module, a data recording module, a ground module, and a vertical grounding electrode overflow density uniformity evaluation device as described in any one of claims 4 to 6; The DC current generating module includes: an AC power generator, a rectifier, a disconnecting switch, and a busbar; The electrode well module includes: an electrode feed rod and electrode well filling coke; The cable module includes: electrode shunt current and current-conducting main cable; The data recording module includes: a signal recorder and a current measuring instrument; The AC power generator and rectifier are directly connected; one end of the main current cable is connected to the busbar and the other end is connected to the electrode shunt cable; the electrode shunt cable is connected to the electrode feed rod; the electrode feed rod is buried deep inside the coke-filled electrode well; the current measuring device is arranged on the electrode shunt cable above each electrode feed rod; the signal recorder and the current measuring device are connected through a test signal line.

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