Grounding electrode step voltage control method and system with eccentric diversion center

Abstract

The invention discloses a step voltage control method and system for a grounding electrode with an eccentric diversion center, and the method comprises the steps: calculating the resistance and grounding current of diversion cables of different polar ring segments according to the eccentric position parameters of the diversion center, and calculating the step voltage of the polar ring segment according to the grounding current; according to the resistance, the earth current and the step voltage of the diversion cable, extracting associated data of the cable length of the diversion cable of each polar ring segment and the step voltage of the corresponding area, and calculating the length of a compensation cable; on the basis of the compensation cable length, whether the compensation effect meets a limit value in a grounding electrode design standard or not is checked again, and the final compensation cable length is determined; and reserving a preset design margin for the length of the final compensation cable to ensure that the system can still stably meet the step voltage control requirement after actual construction.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of grounding electrodes, and more particularly, to a method and system for controlling step voltage of a grounding electrode with a flow center eccentricity. BACKGROUND

[0002] In a high-voltage direct current (HVDC) transmission system, a grounding electrode is a core component for realizing a current loop and ensuring safe and stable operation of the system. The main function of the grounding electrode is to provide a path for direct current to enter the ground during normal operation of the system and to quickly discharge fault current during a fault state to avoid damage to equipment and collapse of the system.

[0003] In the design of a grounding electrode, the traditional concept usually pursues symmetrical arrangement of the electrode rings and the flow center to ensure uniform distribution of current in each electrode ring, thereby controlling the step voltage within a safe range. However, in recent years, with increasing land resource shortage, increasing environmental protection requirements, and increasing difficulty in coordinating interests related to land acquisition, the selection of a site for a high-voltage direct current grounding electrode faces severe challenges. In many projects, due to difficulties in land acquisition in the central area of the site, a scheme of eccentric arrangement of the flow center has to be adopted, i.e., the physical center of the grounding electrode does not coincide with the flow center, resulting in significant differences in the distances of the electrode rings from the flow center. SUMMARY

[0004] According to the present application, a method and system for controlling step voltage of a grounding electrode with a flow center eccentricity are provided to solve the technical problems of uneven distribution of current in each electrode ring and excessive local step voltage caused by eccentric arrangement of the center of the grounding electrode.

[0005] According to a first aspect of the present application, a method for controlling step voltage of a grounding electrode with a flow center eccentricity is provided, comprising:

[0006] According to the position parameters of the flow center eccentricity, the resistances of the flow cables of different electrode ring segments and the ground currents are calculated, and the step voltage of the electrode ring segment is calculated according to the ground currents;

[0007] According to the resistances of the flow cables, the ground currents, and the step voltages, the correlation data of the cable lengths of the flow cables of each electrode ring segment and the corresponding area step voltages are extracted, and the compensation cable lengths are calculated.

[0008] Based on the compensation cable lengths, it is determined whether the compensation effect meets the limit value in the design standard of the grounding electrode design, and the final compensation cable lengths are determined.

[0009] Optionally, calculating the resistances of the flow cables of different electrode ring segments and the ground currents according to the position parameters of the flow center eccentricity, and calculating the step voltage of the electrode ring segment according to the ground currents, comprises:

[0010] Let the total ground current be I, the ground electrode be a single circular ring, the radius of the electrode ring be R, the electrode ring be evenly segmented into n sections, the ground resistance of each electrode ring section be r0, the length of the current-carrying cable from the center of the electrode ring to the electrode ring be l1, l2…lk…ln respectively due to the eccentricity of the center of the ground electrode, and the resistance per unit length of the current-carrying cable be p0. The total resistance of the current-carrying cable of the kth electrode ring section is shown in formula (1):

[0011] rk=p0×lk (1)

[0012] The ground current ik flowing through the kth electrode ring section is calculated as shown in formula (2):

[0013]

[0014] According to the size of the ground current ik and the soil conditions of the ground electrode body, the step voltage Ek of the section needs to be calculated by CDEGS or other grounding design software. For the eccentrically arranged ground electrode, the shorter the length of the current-carrying cable, the greater the current shunt on the responding electrode ring, and the greater the step voltage will be, which exceeds the step voltage when the ground electrode is centrally arranged.

[0015] Optionally, according to the resistance of the current-carrying cable, the ground current, and the step voltage, the correlation data of the cable length of the current-carrying cable of each electrode ring section and the corresponding area step voltage is extracted, and the compensation cable length is calculated, including:

[0016] Considering the compensation cable length l' k , the total cable resistance of the corresponding kth electrode ring section is shown in formula (3):

[0017]

[0018] Formula (3) is brought into formula (2), that is, the ground current i' on the kth electrode ring section after considering the cable compensation is calculated k , because r' k increases, the current distribution of the kth electrode ring section decreases, thus reducing the step voltage of the section. By changing the length of the compensation cable l' k , it is verified whether the calculation result of the step voltage meets the specification requirements.

[0019] Optionally, based on the compensation cable length, it is reviewed whether the compensation effect meets the limit value in the grounding electrode design standard to determine the final compensation cable length, including:

[0020] The length of the compensation cable is substituted into the simulation model for multiple rounds of iterative verification. By comparing the key indicators of current density and step voltage distribution of each pole ring segment before and after compensation, the compensation effect is checked to see if it meets the limit value in the grounding electrode design standard. If there is a case that exceeds the limit value, the length of the compensation cable is recalculated until the simulation result is within the limit value range, and the final length of the compensation cable is determined.

[0021] According to another aspect of the present invention, a ground electrode step voltage control system with an eccentric current-conducting center is also provided, comprising:

[0022] The step voltage calculation module is used to calculate the resistance and ground current of the current-conducting cable of different pole ring segments based on the position parameters of the current-conducting center eccentricity, and to calculate the step voltage of the pole ring segment based on the ground current.

[0023] The compensation cable length calculation module is used to extract the correlation data between the cable length of each pole ring segment and the step voltage of the corresponding area based on the resistance, ground current and step voltage of the current-conducting cable, and calculate the compensation cable length.

[0024] The module for determining the final compensation cable length is used to verify whether the compensation effect meets the limit value in the grounding electrode design standard based on the compensation cable length, and to determine the final compensation cable length.

[0025] Optionally, the step voltage calculation module includes:

[0026] The cable resistance calculation submodule is used to assume that the total ground current of the grounding electrode is I, the grounding electrode is a single circular ring with a radius of R, the ring is evenly divided into n segments, and the grounding resistance of each segment is r0. Due to the eccentricity of the grounding electrode center, the lengths of the current-conducting cable from the center of the ring to the ring are l1, l2…lk…ln, and the resistance per unit length of the current-conducting cable is ρ0. Then the total resistance of the current-conducting cable of the kth segment of the ring is shown in equation (1):

[0027] rk=ρ0×lk (1)

[0028] The submodule for calculating ground current is used to calculate the ground current ik flowing through the kth pole ring segment, as shown in equation (2):

[0029]

[0030] The step voltage calculation submodule is used to calculate the step voltage Ek of the segment based on the magnitude of the ground current ik and the soil conditions of the grounding electrode body, using CDEGS or other grounding design software. For eccentrically arranged grounding electrodes, the shorter the length of the current-carrying cable, the greater the current shunting on the corresponding electrode ring, and the greater the step voltage will be, exceeding the step voltage when the electrode is centrally located.

[0031] Optionally, the module for calculating the compensation cable length includes:

[0032] The submodule for calculating the resistance of the compensated cable is used to take into account the length l′ of the compensated cable. k Then the total cable resistance of the corresponding k-th pole ring is shown in equation (3):

[0033]

[0034] Substituting equation (3) into equation (2), we can calculate the ground current i′ on the k-th pole ring after considering cable compensation. k , because r′ k The current distribution in the k-th segment of the pole ring increases, thus reducing the step voltage of that segment, by changing the compensation cable l′. k The length of the step voltage is used to verify whether the calculated results meet the specifications.

[0035] Optionally, the module for determining the final compensation cable length includes:

[0036] The final compensation cable length determination submodule is used to substitute the compensation cable length into the simulation model for multiple rounds of iterative verification. By comparing the current density and step voltage distribution of each pole ring segment before and after compensation, the module verifies whether the compensation effect meets the limit values ​​in the grounding electrode design standard. If there are cases that exceed the limit values, the compensation cable length is recalculated until the simulation results are within the limit value range, and the final compensation cable length is determined.

[0037] According to another aspect of the invention, a computer-readable storage medium is also provided, on which a computer program is stored, which, when executed by a processor, implements the steps of the method as described in any one of the claims.

[0038] According to another aspect of the present invention, an electronic device is also provided, comprising:

[0039] The aforementioned computer-readable storage medium; and

[0040] One or more processors for executing a program in the computer-readable storage medium.

[0041] Therefore, by compensating for the length of the current-conducting cable, the length of the current-conducting cable connecting each pole ring to the current-conducting center is made approximately the same even when the grounding electrode is eccentrically positioned. This eliminates the problem of inconsistent impedance among the pole rings caused by differences in cable length, achieves uniform current distribution among the pole rings, and ultimately avoids excessive local step voltage. This method specifically addresses the key problem in the specific case of an eccentrically positioned grounding electrode, innovatively proposing a simple and effective solution by focusing on the fundamental influencing factor of current-conducting cable length. Attached Figure Description

[0042] Exemplary embodiments of the present invention can be more fully understood by referring to the following figures:

[0043] Figure 1 This is a flowchart illustrating a method for controlling the step voltage of a grounding electrode with an eccentric current-conducting center, as described in this embodiment.

[0044] Figure 2 This is a schematic diagram of a grounding electrode step voltage control system with an eccentric current-conducting center as described in this embodiment. Detailed Implementation

[0045] Exemplary embodiments of the invention will now be described with reference to the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0046] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0047] According to a first aspect of the present invention, a method 100 for controlling the step voltage of a grounding electrode with an eccentric current-conducting center is provided, with reference to... Figure 1 As shown, the method 100 includes:

[0048] S101: Based on the position parameters of the eccentricity of the current-conducting center, calculate the resistance and ground current of the current-conducting cable of different pole ring segments, and calculate the step voltage of the pole ring segment based on the ground current.

[0049] S102: Based on the resistance, ground current and step voltage of the current-conducting cable, extract the correlation data between the cable length of each pole ring segment and the step voltage of the corresponding area, and calculate the compensation cable length.

[0050] S103: Based on the length of the compensation cable, verify whether the compensation effect meets the limit value in the grounding electrode design standard, and determine the final length of the compensation cable.

[0051] Specifically, the quantitative analysis and calculation during the design phase: In the early stages of grounding electrode design, based on the specific parameters of the eccentric arrangement of the current-conducting center, a simulation model is established to perform simulation calculations on the grounding electrode system under asymmetrical operating conditions. The focus is on calculating the resistance differences (including the grounding resistance of the electrode rings and the resistance of the current-conducting cables) caused by the differences in the length of the current-conducting cables in different electrode ring segments. Simultaneously, the current distribution of each segment and the corresponding step voltage values ​​are simulated to clarify the degree of difference in step voltage in different areas and the risk points of exceeding the standard.

[0052] To illustrate the above relationship, let's take a single circular ring symmetrical arrangement of grounding electrodes as an example. Let the total ground current into the ground be I, the grounding electrode be arranged in a single circular ring with a radius of R, and the ring be evenly divided into n segments. The grounding resistance of each segment of the ring is r0. Due to the eccentricity of the grounding electrode center, the lengths of the current-conducting cables from the center of the ring to the ring are l1, l2…lk…ln, and the resistance per unit length of the current-conducting cable is ρ0. Then, the total resistance of the current-conducting cable in the kth ring segment is shown in equation (1):

[0053] rk=ρ0×lk (1)

[0054] The ground current ik flowing through the kth pole ring segment is shown in equation (2):

[0055]

[0056] Depending on the size of ik and the soil conditions of the grounding electrode, the step voltage Ek of the segment can be calculated using CDEGS or other professional grounding design software. For eccentrically arranged grounding electrodes, the shorter the length of the current-carrying cable, the greater the current shunting on the corresponding electrode ring, and the greater the step voltage will be, exceeding the step voltage when the electrode is centrally located.

[0057] Determination of compensation amount based on step voltage difference: Based on the above calculation results, the correlation data between the actual length of the current-carrying cable of each pole ring segment and the step voltage of the corresponding area is extracted to establish a mapping relationship of "cable length-resistance-current-step voltage". For pole ring segments with excessive step voltage, the required cable length compensation amount is derived in reverse - that is, by increasing the cable length to compensate for the resistance difference, so that the total impedance of the target segment is consistent with that of other normal segments, thereby balancing the current distribution and reducing the step voltage.

[0058] Essentially, the purpose of cable compensation is to distribute the current as evenly as possible across each pole ring segment. For pole ring segments with excessive step voltage, the length of the compensation cable l′ should be considered. k Then the total resistance of the corresponding k-th segment pole ring is shown in equation (3):

[0059] r′ k =ρ0×(lk +l′) k (3)

[0060] Substituting equation (3) into equation (2), we can calculate the ground current i′ on the k-th pole ring after considering cable compensation. k , because r′ k The increase in voltage distribution reduces the current distribution in the k-th segment's pole ring, thus effectively reducing the step voltage in that segment. This can be achieved by changing the compensation cable l′. k The length of the step voltage is used to verify whether the calculated results meet the specifications.

[0061] Simulation verification and optimization of the compensation scheme: The initially determined cable compensation length parameters are substituted into the simulation model for multiple rounds of iterative verification. By comparing key indicators such as current density and step voltage distribution of each pole ring segment before and after compensation, the compensation effect is verified to ensure it meets the limits in the grounding electrode design standard. If there are still local cases where the limits are exceeded, the compensation length is fine-tuned or the compensation segment division is optimized until the simulation results fully meet the design requirements.

[0062] Design margin provision: When determining the final compensation length, take into account the error factors that may occur during construction, including the length deviation during cable laying (within ±5%), resistance fluctuations caused by connection process, and the subtle influence of soil resistivity non-uniformity on current distribution, and reserve a design margin of 5%-10% to ensure that the system can still stably meet the step voltage control requirements after actual construction.

[0063] Path planning and implementation in actual construction: Based on the specific location of the pole center eccentricity (e.g., biased towards a certain pole ring or segment area), and considering factors such as site topography and construction convenience, the laying path of the compensating cable should be rationally planned. Priority should be given to paths away from sensitive equipment and facilitating later maintenance. For compensating cables requiring increased length, serpentine laying or partial detours can be used to achieve length compensation, avoiding increased construction difficulty or cable damage due to unreasonable paths. After laying, the actual length of all cables should be remeasured, and impedance consistency should be verified through continuity testing.

[0064] Optionally, based on the position parameters of the eccentricity of the current-conducting center, the resistance and ground current of the current-conducting cable for different pole ring segments are calculated, and the step voltage of the pole ring segment is calculated based on the ground current, including:

[0065] Let the total ground current into the ground electrode be I, the ground electrode be a single circular ring with a radius of R, and the ring be evenly divided into n segments. The grounding resistance of each segment is r0. Due to the eccentricity of the ground electrode center, the lengths of the current-conducting cables from the center of the ring to the ring are l1, l2…lk…ln, and the resistance per unit length of the current-conducting cable is ρ0. Then the total resistance of the current-conducting cable in the kth segment of the ring is shown in equation (1):

[0066] rk=ρ0×lk (1)

[0067] The ground current ik flowing through the kth pole ring segment is calculated as shown in equation (2):

[0068]

[0069] Based on the magnitude of the ground current ik and the soil conditions of the grounding electrode, the step voltage Ek of this segment needs to be calculated using CDEGS or other grounding design software. For eccentrically arranged grounding electrodes, the shorter the length of the current-carrying cable, the greater the current shunting on the corresponding electrode ring, and the greater the step voltage will be, exceeding the step voltage when the electrode is centrally located.

[0070] Optionally, based on the resistance, ground current, and step voltage of the current-conducting cable, the correlation data between the cable length of each pole ring segment and the step voltage of the corresponding area is extracted, and the compensation cable length is calculated, including:

[0071] Considering the compensating cable length l′ k Then the total cable resistance of the corresponding k-th pole ring is shown in equation (3):

[0072]

[0073] Substituting equation (3) into equation (2), we can calculate the ground current i′ on the k-th pole ring after considering cable compensation. k , because r′ k The current distribution in the k-th segment of the pole ring increases, thus reducing the step voltage of that segment, by changing the compensation cable l′. k The length of the step voltage is used to verify whether the calculated results meet the specifications.

[0074] Optionally, based on the length of the compensation cable, the compensation effect is checked to see if it meets the limits in the grounding electrode design standard, and the final compensation cable length is determined, including:

[0075] The length of the compensation cable is substituted into the simulation model for multiple rounds of iterative verification. By comparing the key indicators of current density and step voltage distribution of each pole ring segment before and after compensation, the compensation effect is checked to see if it meets the limit value in the grounding electrode design standard. If there is a case that exceeds the limit value, the length of the compensation cable is recalculated until the simulation result is within the limit value range, and the final length of the compensation cable is determined.

[0076] Therefore, by compensating for the length of the current-conducting cable, the length of the current-conducting cable connecting each pole ring to the current-conducting center is made approximately the same even when the grounding electrode is eccentrically positioned. This eliminates the problem of inconsistent impedance among the pole rings caused by differences in cable length, achieves uniform current distribution among the pole rings, and ultimately avoids excessive local step voltage. This method specifically addresses the key problem in the specific case of an eccentrically positioned grounding electrode, innovatively proposing a simple and effective solution by focusing on the fundamental influencing factor of current-conducting cable length.

[0077] According to another aspect of the invention, a ground electrode step voltage control system 200 with an eccentric current-conducting center is also provided, with reference to... Figure 2 As shown, the system 200 includes:

[0078] The step voltage calculation module 210 is used to calculate the resistance and ground current of the current-conducting cable of different pole ring segments based on the position parameters of the current-conducting center eccentricity, and to calculate the step voltage of the pole ring segment based on the ground current.

[0079] The compensation cable length calculation module 220 is used to extract the correlation data between the cable length of the current-conducting cable in each pole ring segment and the step voltage of the corresponding area based on the resistance, ground current and step voltage of the current-conducting cable, and calculate the compensation cable length.

[0080] The module 230 for determining the final compensation cable length is used to verify whether the compensation effect meets the limit value in the grounding electrode design standard based on the compensation cable length, and to determine the final compensation cable length.

[0081] The reserved design margin module 240 is used to reserve a predetermined design margin for the final compensation cable length to ensure that the system can still stably meet the step voltage control requirements after actual construction.

[0082] Optionally, the step voltage calculation module includes:

[0083] The cable resistance calculation submodule is used to assume that the total ground current of the grounding electrode is I, the grounding electrode is a single circular ring with a radius of R, the ring is evenly divided into n segments, and the grounding resistance of each segment is r0. Due to the eccentricity of the grounding electrode center, the lengths of the current-conducting cable from the center of the ring to the ring are l1, l2…lk…ln, and the resistance per unit length of the current-conducting cable is ρ0. Then the total resistance of the current-conducting cable of the kth segment of the ring is shown in equation (1):

[0084] rk=ρ0×lk (1)

[0085] The submodule for calculating ground current is used to calculate the ground current ik flowing through the kth pole ring segment, as shown in equation (2):

[0086]

[0087] The step voltage calculation submodule is used to calculate the step voltage Ek of the segment based on the magnitude of the ground current ik and the soil conditions of the grounding electrode body, using CDEGS or other grounding design software. For eccentrically arranged grounding electrodes, the shorter the length of the current-carrying cable, the greater the current shunting on the corresponding electrode ring, and the greater the step voltage will be, exceeding the step voltage when the electrode is centrally located.

[0088] Optionally, the module for calculating the compensation cable length includes:

[0089] The submodule for calculating the resistance of the compensated cable is used to take into account the length l′ of the compensated cable. k Then the total cable resistance of the corresponding k-th pole ring is shown in equation (3):

[0090]

[0091] Substituting equation (3) into equation (2), we can calculate the ground current i′ on the k-th pole ring after considering cable compensation. k , because r′ k The current distribution in the k-th segment of the pole ring increases, thus reducing the step voltage of that segment, by changing the compensation cable l′. k The length of the step voltage is used to verify whether the calculated results meet the specifications.

[0092] Optionally, the module for determining the final compensation cable length includes:

[0093] The final compensation cable length determination submodule is used to substitute the compensation cable length into the simulation model for multiple rounds of iterative verification. By comparing the current density and step voltage distribution of each pole ring segment before and after compensation, the module verifies whether the compensation effect meets the limit values ​​in the grounding electrode design standard. If there are cases that exceed the limit values, the compensation cable length is recalculated until the simulation results are within the limit value range, and the final compensation cable length is determined.

[0094] The step voltage control system 200 of the ground electrode with eccentric current conduction center according to an embodiment of the present invention corresponds to the step voltage control method 100 of the ground electrode with eccentric current conduction center according to another embodiment of the present invention, and will not be described again here.

[0095] Those skilled in the art will understand that embodiments of this application can be provided as methods, systems, or computer program products. Therefore, this application can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application can take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. The solutions in the embodiments of this application can be implemented in various computer languages, such as the object-oriented programming language Java and the interpreted scripting language JavaScript.

[0096] This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart... Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0097] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0098] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0099] Although preferred embodiments of this application have been described, those skilled in the art, upon learning the basic inventive concept, can make other changes and modifications to these embodiments. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments as well as all changes and modifications falling within the scope of this application.

[0100] Obviously, those skilled in the art can make various modifications and variations to this application without departing from the spirit and scope of this application. Therefore, if such modifications and variations fall within the scope of the claims of this application and their equivalents, this application also intends to include such modifications and variations.

Claims

1. A method for controlling the step voltage of a grounding electrode with an eccentric current-conducting center, characterized in that, include: Based on the position parameters of the eccentricity of the current-conducting center, the resistance and ground current of the current-conducting cable of different pole ring segments are calculated, and the step voltage of the pole ring segment is calculated based on the ground current. Based on the resistance, ground current, and step voltage of the current-conducting cable, the correlation data between the cable length of each pole ring segment and the step voltage of the corresponding area is extracted, and the compensation cable length is calculated. Based on the length of the compensation cable, verify whether the compensation effect meets the limit value in the grounding electrode design standard, and determine the final length of the compensation cable.

2. The method for controlling the step voltage of a grounding electrode with an eccentric current-conducting center according to claim 1, characterized in that, Based on the position parameters of the eccentricity of the current-conducting center, the resistance and ground current of the current-conducting cable for different pole ring segments are calculated, and the step voltage of the pole ring segment is calculated based on the ground current, including: Let the total ground current into the ground electrode be I, the ground electrode be a single circular ring with a radius of R, and the ring be evenly divided into n segments. The grounding resistance of each segment is r0. Due to the eccentricity of the ground electrode center, the lengths of the current-conducting cables from the center of the ring to the ring are l1, l2…lk…ln, and the resistance per unit length of the current-conducting cable is ρ0. Then the total resistance of the current-conducting cable in the kth segment of the ring is shown in equation (1): rk=ρ0×lk (1) The ground current ik flowing through the kth pole ring segment is calculated as shown in equation (2): Based on the magnitude of the ground current ik and the soil conditions of the grounding electrode, the step voltage Ek of this segment needs to be calculated using CDEGS or other grounding design software. For eccentrically arranged grounding electrodes, the shorter the length of the current-carrying cable, the greater the current shunting on the corresponding electrode ring, and the greater the step voltage will be, exceeding the step voltage when the electrode is centrally located.

3. The method for controlling the step voltage of a grounding electrode with an eccentric current-conducting center according to claim 2, characterized in that, Based on the resistance, ground current, and step voltage of the current-conducting cable, the correlation data between the cable length of each pole ring segment and the step voltage of the corresponding area is extracted, and the compensation cable length is calculated, including: Considering the compensating cable length l′ k Then the total cable resistance of the corresponding k-th pole ring is shown in equation (3): Substituting equation (3) into equation (2), we can calculate the ground current i′ on the k-th pole ring after considering cable compensation. k , because r′ k The current distribution in the k-th segment of the pole ring increases, thus reducing the step voltage of that segment, by changing the compensation cable l′. k The length of the step voltage is used to verify whether the calculated results meet the specifications.

4. The method for controlling the step voltage of a grounding electrode with an eccentric current-conducting center according to claim 1, characterized in that, Based on the length of the compensation cable, verify whether the compensation effect meets the limits in the grounding electrode design standard, and determine the final length of the compensation cable, including: The length of the compensation cable is substituted into the simulation model for multiple rounds of iterative verification. By comparing the key indicators of current density and step voltage distribution of each pole ring segment before and after compensation, the compensation effect is checked to see if it meets the limit value in the grounding electrode design standard. If there is a case that exceeds the limit value, the length of the compensation cable is recalculated until the simulation result is within the limit value range, and the final length of the compensation cable is determined.

5. A grounding electrode step voltage control system with an eccentric current-conducting center, characterized in that, include: The step voltage calculation module is used to calculate the resistance and ground current of the current-conducting cable of different pole ring segments based on the position parameters of the current-conducting center eccentricity, and to calculate the step voltage of the pole ring segment based on the ground current. The compensation cable length calculation module is used to extract the correlation data between the cable length of each pole ring segment and the step voltage of the corresponding area based on the resistance, ground current and step voltage of the current-conducting cable, and calculate the compensation cable length. The module for determining the final compensation cable length is used to verify whether the compensation effect meets the limit value in the grounding electrode design standard based on the compensation cable length, and to determine the final compensation cable length.

6. A grounding electrode step voltage control system with an eccentric current-conducting center according to claim 5, characterized in that, The step voltage calculation module includes: The cable resistance calculation submodule is used to assume that the total ground current of the grounding electrode is I, the grounding electrode is a single circular ring with a radius of R, the ring is evenly divided into n segments, and the grounding resistance of each segment is r0. Due to the eccentricity of the grounding electrode center, the lengths of the current-conducting cable from the center of the ring to the ring are l1, l2…lk…ln, and the resistance per unit length of the current-conducting cable is ρ0. Then the total resistance of the current-conducting cable of the kth segment of the ring is shown in equation (1): rk=ρ0×lk (1) The submodule for calculating ground current is used to calculate the ground current ik flowing through the kth pole ring segment, as shown in equation (2): The step voltage calculation submodule is used to calculate the step voltage Ek of the segment based on the magnitude of the ground current ik and the soil conditions of the grounding electrode body, using CDEGS or other grounding design software. For eccentrically arranged grounding electrodes, the shorter the length of the current-carrying cable, the greater the current shunting on the corresponding electrode ring, and the greater the step voltage will be, exceeding the step voltage when the electrode is centrally located.

7. A grounding electrode step voltage control system with an eccentric current-conducting center according to claim 6, characterized in that, The module for calculating the length of the compensating cable includes: The submodule for calculating the resistance of the compensated cable is used to take into account the length l′ of the compensated cable. k Then the total cable resistance of the corresponding k-th pole ring is shown in equation (3): r′ k =ρ0×(p+l′ k ) (3) Substituting equation (3) into equation (2), we can calculate the ground current i′ on the k-th pole ring after considering cable compensation. k , because r′ k The current distribution in the k-th segment of the pole ring increases, thus reducing the step voltage of that segment, by changing the compensation cable l′. k The length of the step voltage is used to verify whether the calculated results meet the specifications.

8. A grounding electrode step voltage control system with an eccentric current-conducting center according to claim 7, characterized in that, The module for determining the final compensation cable length includes: The final compensation cable length determination submodule is used to substitute the compensation cable length into the simulation model for multiple rounds of iterative verification. By comparing the current density and step voltage distribution of each pole ring segment before and after compensation, the module verifies whether the compensation effect meets the limit values ​​in the grounding electrode design standard. If there are cases that exceed the limit values, the compensation cable length is recalculated until the simulation results are within the limit value range, and the final compensation cable length is determined.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it implements the steps of the method as described in any one of claims 1-4.

10. An electronic device, characterized in that, include: The computer-readable storage medium as described in claim 9; as well as One or more processors for executing a program in the computer-readable storage medium.

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