Multi-point regulation and control method, device and equipment for pipeline under extra-high voltage direct current interference

Abstract

The invention discloses a pipeline multi-point regulation and control method, device and equipment under extra-high voltage direct current interference, and relates to the field of pipeline corrosion and protection. Inputting the state parameters into a pre-constructed first function mapping relation, and outputting potential distribution of the pipeline without the potentiostat; based on the potential distribution, determining a plurality of key control points for installing the potentiostat by taking a potential zero point as a reference; determining a regulation and control coefficient of the potentiostat installed at each key control point; randomly selecting the output current of the potentiostat by adopting a particle swarm algorithm, calculating the potential of each key control point according to a random selection result and the regulation and control coefficient, calculating the potential variance along the pipeline according to the potential of each key control point, and when the potential variance along the pipeline is minimum and meets a potential constraint condition, determining that the pipeline is the pipeline. The optimal output current of the constant potential rectifier is obtained; and regulating and controlling the output of the constant potential rectifier based on the optimal output current.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of pipeline corrosion and protection, more particularly, it relates to a pipeline multi-point regulation method, device and equipment under UHVDC interference. BACKGROUND

[0002] With the parallel or intersection phenomenon of buried pipelines for gas or oil transmission and UHV power transmission system in line site selection, the buried steel pipeline is increasingly affected by stray current interference corrosion and danger. The grounding electrode discharge of UHVDC transmission system has uncertainty, transience and complexity. Due to the influence of grounding electrode discharge polarity, discharge current, discharge time and relative position with the pipeline, the interference degree and influence range of the nearby buried pipeline are different. For the protection of high-voltage direct current grounding electrode interference, the main methods include: zinc strip sacrificial anode polarity drainage, forced drainage, valve chamber or station grounding high potential conduction connection, pipeline segmentation insulation, etc. Among them, forced drainage is suitable for areas with high interference intensity and large influence range, and plays a major role in inhibiting stray current.

[0003] According to the test results, it is found that the corrosion protection measures such as constant potential instrument and zinc strip have played a positive role in relieving and inhibiting stray current interference. The existing single-point regulation method only adjusts the output current size of the constant potential instrument according to the interference of the pipeline near the constant potential instrument. This form may cause the constant potential instrument output to continuously increase when the near-end interference of the constant potential instrument is too large, resulting in over-protection of stray current flowing into the far end of the pipeline. There are high corrosion risk areas and over-protection areas coexisting in the pipeline. Secondly, the installation position of the corrosion protection measures such as constant potential instrument and zinc strip on the pipeline is not clear, which may cause resource waste due to the installation of multiple protection measures. SUMMARY

[0004] The purpose of the present application is to provide a pipeline multi-point regulation method, device and equipment under UHVDC interference, which solves the problem of coexistence of high corrosion risk areas and over-protection areas in the pipeline caused by single-point regulation method during UHVDC discharge, reduces the corrosion risk of the pipeline, and prolongs the service life of the pipeline.

[0005] In a first aspect of the present application, a pipeline multi-point regulation method under UHVDC interference is provided, the method comprising:

[0006] obtaining a state parameter of a pipeline without a constant potential instrument installed;

[0007] inputting the state parameter into a first function mapping relationship constructed in advance to output the potential distribution of the pipeline without the constant potential instrument installed; wherein the first function mapping relationship refers to the correlation between the potential distribution along the pipeline and the state parameter;

[0008] Based on the potential distribution, and taking the zero potential point as a reference, several key control points for installing a potentiostat on the pipeline are determined.

[0009] Determine the control coefficient of the potentiostat installed at each key control point;

[0010] The particle swarm optimization algorithm is used to randomly select the output current of the potentiostat to obtain the random selection result of the output current. Based on the random selection result and the control coefficient, the potential of each key control point is calculated. Based on the potential of each key control point, the potential variance along the pipeline is calculated. When the potential variance along the pipeline is minimized and the potential constraint condition is met, the optimal output current of the potentiostat is obtained.

[0011] The output of the potentiostat is adjusted based on the optimal output current.

[0012] In one implementation, the state parameters include pipeline parameters, interference source parameters, and environmental parameters.

[0013] In one implementation scheme, the control coefficient of the potentiostat installed at each key control point is determined, including:

[0014] By changing the output current of the potentiostat at each critical control point, the potential of each critical control point in the pipeline under different output currents is measured.

[0015] Based on the ratio of potential to output current, the control coefficient of the potentiostat installed at each key control point is determined.

[0016] In one implementation scheme, the control coefficient of the potentiostat installed at each key control point is determined, including:

[0017] In the first function mapping relationship, the output current of the potentiostat is introduced to construct the second function mapping relationship; the second function mapping relationship refers to the correlation between the potential distribution along the pipeline and the state parameters and the output current.

[0018] Based on the mapping relationship of the second function, the potential of each key control point of the pipeline under different output currents is calculated;

[0019] Based on the ratio of potential to output current, the control coefficient of the potentiostat installed at each key control point is determined.

[0020] In one implementation, the expression for minimizing the potential variance at key control points along the pipeline is: min(V²-V). 2 +(V3-V) 2 +……+(V N -V) 2 Where N represents the number of critical control points, and V NV represents the potential of the Nth critical control point, and V represents the standard value of the potential.

[0021] In one implementation, the potential constraint condition is that the sum of the potentials at each critical control point is greater than or equal to -3 volts and less than or equal to -0.5 volts.

[0022] A second aspect of this application provides a multi-point control device for pipelines under ultra-high voltage direct current interference, the device comprising:

[0023] The parameter acquisition module is used to acquire the status parameters of pipes that are not equipped with a potentiostat.

[0024] The potential distribution determination module is used to input state parameters into a pre-constructed first function mapping relationship and output the potential distribution of the pipeline without a potentiostat installed; wherein the first function mapping relationship refers to the correlation between the potential distribution along the pipeline and the state parameters;

[0025] The installation point selection module is used to determine multiple key control points for installing a potentiostat on the pipeline based on the potential distribution and with the zero potential point as a reference.

[0026] The control coefficient determination module is used to determine the control coefficient of the potentiostat installed at each key control point.

[0027] The optimization module is used to randomly select the output current of the potentiostat using the particle swarm optimization algorithm, obtain the random selection result of the output current, calculate the potential of each key control point based on the random selection result and the control coefficient, calculate the potential variance along the pipeline based on the potential of each key control point, and obtain the optimal output current of the potentiostat when the potential variance along the pipeline is minimized and the potential constraint condition is met.

[0028] The control module is used to control the output of the potentiostat based on the optimal output current.

[0029] In one implementation, the control coefficient determination module is further used for:

[0030] By changing the output current of the potentiostat at each critical control point, the potential of each critical control point in the pipeline under different output currents is measured.

[0031] Based on the ratio of potential to output current, the control coefficient of the potentiostat installed at each key control point is determined.

[0032] In one implementation, the control coefficient determination module is further used for:

[0033] In the first function mapping relationship, the output current of the potentiostat is introduced to construct the second function mapping relationship; the second function mapping relationship refers to the correlation between the potential distribution along the pipeline and the state parameters and the output current.

[0034] Based on the mapping relationship of the second function, the potential of each key control point of the pipeline under different output currents is calculated;

[0035] Based on the ratio of potential to output current, the control coefficient of the potentiostat installed at each key control point is determined.

[0036] A third aspect of this application provides a pipeline multi-point control device under ultra-high voltage direct current interference. The multi-point control device includes a processor, a memory, and a computer program stored in the memory and executable by the processor. When the computer program is executed by the processor, it implements the steps of a pipeline multi-point control method under ultra-high voltage direct current interference as provided in the first aspect of this application.

[0037] Compared with the prior art, the present invention has the following beneficial effects:

[0038] 1. In the multi-point control method for pipelines under UHVDC interference provided in this application, a functional mapping relationship of the pipeline is established through state parameters, and the key control points of the pipeline potential are determined based on the functional mapping relationship. This solves the problem of unclear installation location of existing potentiostats and avoids the waste of resources caused by installing multiple potentiostats.

[0039] 2. In the multi-point control method for pipelines under UHVDC interference provided in this application, the pipeline potential at key control point locations is adjusted to make the potential of the entire pipeline conform to the standard, which solves the pipeline corrosion risk that may exist in the original single-point control. Compared with the single-point control provided by the prior art which is a fixed pipeline potential, this application controls the potential of the entire pipeline within the range that conforms to the standard, which is more flexible and has a better protection effect against DC stray current interference.

[0040] 3. In the multi-point control method for pipelines under UHVDC interference provided in this application, the particle swarm optimization algorithm is used to randomly select the output current of the potentiostat to obtain the random selection result of the output current. Based on the random selection result and the control coefficient, the potential of each key control point is calculated. Based on the potential of each key control point, the potential variance along the pipeline is calculated. When the potential variance along the pipeline is minimized and the potential constraint condition is met, the optimal output current of the potentiostat is obtained. Based on this optimal output current, the entire pipeline can be well protected from DC stray current interference, and there will be no over-protection of potential near the pipeline or under-protection of potential far from the pipeline. Moreover, the potential of the entire pipeline is in a relatively stable range. Attached Figure Description

[0041] The accompanying drawings, which are included to provide a further understanding of embodiments of the invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0042] Figure 1 A flowchart illustrating a multi-point control method for pipelines under ultra-high voltage direct current interference, provided as an embodiment of this application;

[0043] Figure 2 This is a diagram showing the pipeline potential control range provided in an embodiment of this application;

[0044] Figure 3 This is a schematic diagram of a pipeline multi-point control device under ultra-high voltage direct current interference, provided as an embodiment of this application. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of the present invention are only used to explain the present invention and are not intended to limit the present invention.

[0046] It should be noted that the terms "comprising" or "may include" used in the various embodiments of this application indicate the presence of the claimed function, operation, or element, and do not limit the addition of one or more functions, operations, or elements. Furthermore, as used in the various embodiments of this application, the terms "comprising," "having," and their cognates are intended only to indicate a specific feature, number, step, operation, element, component, or combination of the foregoing, and should not be construed as primarily excluding the presence of one or more other features, numbers, steps, operations, elements, components, or combinations of the foregoing, or adding one or more combinations of the foregoing.

[0047] It should be understood that terms such as "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0048] Please refer to Figure 1 , Figure 1 This application provides a flowchart illustrating a multi-point control method for pipelines under ultra-high voltage direct current interference, as shown in the embodiments below. Figure 1 As shown, the method includes:

[0049] S101, Obtain the status parameters of the pipe that is not equipped with a potentiostat.

[0050] In this embodiment, the state parameters include pipeline parameters, interference source parameters, and environmental parameters. The pipeline parameters include pipe diameter, wall thickness, burial depth, pipeline length, pipeline direction, and anti-corrosion layer type. The interference source parameters near the pipeline include the length, direction, transmission level, load current, and conductor specifications of the high-voltage direct current transmission line. The environmental parameters of the pipeline burial area include soil type, soil resistivity, and soil stratification.

[0051] S102, input the state parameters to the pre-constructed first function mapping relationship, and output the potential distribution of the pipeline without a potentiostat installed; where the first function mapping relationship refers to the correlation between the potential distribution along the pipeline and the state parameters.

[0052] In this embodiment, the first function mapping relationship is constructed using numerical simulation software, and its expression is: V = f(X1, X2, X3); where X1 represents the pipe parameter, X2 represents the interference source parameter, X3 represents the environmental parameter, V represents the potential distribution, and f represents the calculation function of the pipe potential distribution, which is affected by the combined influence of the pipe parameter, the interference source parameter, and the environmental parameter.

[0053] The first function mapping relationship is constructed using numerical simulation analysis. The analysis process includes: establishing an interference model in numerical simulation software based on the collected state parameters. The interference model includes a pipeline model, an interference source model, and an environment model. The pipeline potential distribution is obtained by calculating the interference model.

[0054] Therefore, in this embodiment, a function mapping relationship of the pipeline is established through state parameters, and the key control points of the pipeline potential are determined based on the function mapping relationship. This solves the problem of unclear installation location of existing potentiostats and avoids the waste of resources caused by installing multiple potentiostats.

[0055] S103, Based on the potential distribution, and with the zero potential point as a reference, determine several key control points for installing a potentiostat on the pipeline.

[0056] In this embodiment, using the zero potential point as a reference, interference extreme points with opposite phases are found in the potential distribution, namely the anodic discharge point and the cathodic discharge point. The pipeline locations corresponding to these interference extreme points are determined as critical control points, and then a potentiostat is installed near the critical control points. When a potential fluctuation occurs at a certain point in the pipeline, the pipeline potential at the critical control point is measured, and the measured pipeline potential at the critical control point location is transmitted to the server. When the potentiostat outputs current to provide cathodic protection for the entire pipeline, the pipeline potential at each critical control point along the entire pipeline is not the same due to the different degrees of interference from the interference source and the different environmental parameters around the pipeline. Therefore, the server needs to apply different control coefficients to different critical control points to ensure that the potential of the entire pipeline meets the relevant standards.

[0057] S104, determine the control coefficient of the potentiostat installed at each critical control point.

[0058] In this embodiment, since there is a linear relationship between the pipe potential and the output current of the potentiostat, the control coefficient refers to the linearity coefficient between the output current of the potentiostat and the pipe potential.

[0059] The control coefficient can be determined in two ways: one is to change the output current of the potentiostat at each key control point and measure the potential of each key control point in the pipeline under different output currents; then, based on the ratio of potential to output current, the control coefficient of the potentiostat installed at each key control point can be determined.

[0060] The second method is numerical simulation, which involves introducing the output current of a potentiostat based on the first function mapping relationship established in step S102, thereby constructing a second function mapping relationship for pipeline DC interference protection; where the second function mapping relationship refers to the correlation between the pipeline potential distribution and the state parameters and output current.

[0061] The expression for the second function mapping relationship is: V = f(X1, X2, X3, X4); where X4 represents the applied current protection parameter.

[0062] Then, based on the second function mapping relationship, the potential of each key control point of the pipeline under different output currents is calculated;

[0063] Finally, based on the ratio of potential to output current calculated from the second function mapping relationship, the control coefficient of the potentiostat installed at each key control point is determined.

[0064] S105 uses a particle swarm optimization algorithm to randomly select the output current of the potentiostat, obtains the random selection result of the output current, calculates the potential of each key control point based on the random selection result and the control coefficient, calculates the potential variance along the pipeline based on the potential of each key control point, and obtains the optimal output current of the potentiostat when the potential variance along the pipeline is minimized and the potential constraint condition is met.

[0065] In this embodiment, since there is a certain functional relationship between the potential at each point in the pipeline and the output current of the potentiostat, the particle swarm optimization algorithm is applied to optimize the pipeline. The objective function is to minimize the potential variance along the pipeline, and the variable is the output current of the potentiostat. This ensures that the potential along the entire pipeline meets the standard and has minimal fluctuations, thus obtaining the control coefficient of the potential at each point in the pipeline and the magnitude of the output current of the potentiostat.

[0066] The expression for minimizing the potential variance is: min(V²-V) 2 +(V3-V) 2 +……+(V N -V) 2 Where N represents the number of critical control points, and V N V represents the potential of the Nth critical control point, and V represents the standard value of the potential.

[0067] like Figure 2 As shown, the potential constraint condition is that the sum of the potentials at each critical control point is greater than or equal to -3 volts and less than or equal to -0.5 volts. The expression for the potential constraint condition is: Among them, V1, V2, V3, V N This represents the potential at critical control points along the entire pipeline, in mV; K. 11 K 12 K 13 K MN The control coefficients representing key control points; I1, I2, I3, I M This indicates the power supply output current of each potentiometer, in A.

[0068] In this embodiment, a particle swarm optimization algorithm is used to randomly select the output current of the potentiostat to obtain the random selection result of the output current. Based on the random selection result and the control coefficient, the potential of each key control point is calculated. Based on the potential of each key control point, the potential variance along the pipeline is calculated. When the potential variance along the pipeline is minimized and the potential constraint condition is met, the optimal output current of the potentiostat is obtained. Based on this optimal output current, the entire pipeline can be well protected from DC stray current interference, and there will be no over-protection of potential near the pipeline or under-protection of potential far from the pipeline. Moreover, the potential of the entire pipeline is in a relatively stable range.

[0069] S106, The output of the potentiostat is adjusted based on the optimal output current.

[0070] In this embodiment, based on the optimal output current of the potentiostat, the server applies different control coefficients to the potentiostats at each key control point to optimize the output current of the potentiostat, thereby ensuring that the potential of the entire pipeline meets the standard and has minimal fluctuations. In other words, by adjusting the pipeline potential at the key control point locations, the potential of the entire pipeline meets the standard, solving the pipeline corrosion risk that may exist with the original single-point control. Compared with the single-point control provided by the prior art, which provides a fixed pipeline potential, this application controls the potential of the entire pipeline within a standard-compliant range, offering greater flexibility and better protection against DC stray current interference.

[0071] Please refer to Figure 3 , Figure 3 A schematic diagram of a multi-point control device for pipelines under ultra-high voltage direct current interference provided in this application embodiment is shown below. Figure 3 As shown, the device includes:

[0072] The parameter acquisition module 310 is used to acquire the state parameters of the pipe that is not equipped with a potentiostat;

[0073] The potential distribution determination module 320 is used to input the state parameters to a pre-constructed first function mapping relationship and output the potential distribution of the pipeline without a potentiostat installed; wherein the first function mapping relationship refers to the correlation between the potential distribution along the pipeline and the state parameters;

[0074] The installation point selection module 330 is used to determine multiple key control points for installing a potentiostat on the pipeline based on the potential distribution and with the zero potential point as a reference.

[0075] The control coefficient determination module 340 is used to determine the control coefficient of the potentiostat installed at each key control point.

[0076] The optimization module 350 is used to randomly select the output current of the potentiostat using the particle swarm optimization algorithm, obtain the random selection result of the output current, calculate the potential of each key control point based on the random selection result and the control coefficient, calculate the potential variance along the pipeline based on the potential of each key control point, and obtain the optimal output current of the potentiostat when the potential variance along the pipeline is minimized and the potential constraint condition is met.

[0077] The control module 360 ​​is used to control the output of the potentiostat based on the optimal output current.

[0078] As can be seen, the pipeline multi-point control device under ultra-high voltage direct current interference provided in this application embodiment is similar to the one described above. Figure 1The method for multi-point control of pipelines under ultra-high voltage direct current interference shown is a technical solution based on the same inventive concept. Through the detailed description of the method for multi-point control of pipelines under ultra-high voltage direct current interference provided in the above embodiments, those skilled in the art can clearly understand the implementation process of the multi-point control device for pipelines under ultra-high voltage direct current interference in this embodiment. Therefore, for the sake of brevity, it will not be described again here.

[0079] Accordingly, the pipeline multi-point control device under UHVDC interference provided in this application embodiment has the same beneficial effects as the pipeline multi-point control method under UHVDC interference, namely:

[0080] 1. By establishing a functional mapping relationship for the pipeline through state parameters, and determining the key control points of the pipeline potential based on the functional mapping relationship, the problem of unclear installation location of existing potentiostats is solved, and the waste of resources caused by installing multiple potentiostats is avoided.

[0081] 2. By adjusting the pipeline potential at key control points, the potential of the entire pipeline is made to meet the standard, which solves the pipeline corrosion risk that may exist in the original single-point control. Compared with the single-point control provided by the existing technology, which is a fixed pipeline potential, this application controls the potential of the entire pipeline within the range that meets the standard, which is more flexible and has a better protection effect against DC stray current interference.

[0082] 3. A particle swarm optimization algorithm is used to randomly select the output current of the potentiostat. Based on the random selection result and the control coefficient, the potential at each key control point is calculated. The potential variance along the pipeline is then calculated based on the potential at each key control point. The optimal output current of the potentiostat is obtained when the potential variance along the pipeline is minimized and the potential constraint condition is met. This optimal output current effectively protects the entire pipeline from DC stray current interference, preventing over-protection near the pipeline or under-protection far from the pipeline, and ensuring the potential along the entire pipeline remains within a relatively stable range.

[0083] In some embodiments, the control coefficient determination module is further used for:

[0084] By changing the output current of the potentiostat at each critical control point, the potential of each critical control point in the pipeline under different output currents is measured.

[0085] Based on the ratio of potential to output current, the control coefficient of the potentiostat installed at each key control point is determined.

[0086] In some embodiments, the control coefficient determination module is further used for:

[0087] In the first function mapping relationship, the output current of the potentiostat is introduced to construct the second function mapping relationship; the second function mapping relationship refers to the correlation between the potential distribution along the pipeline and the state parameters and the output current.

[0088] Based on the mapping relationship of the second function, the potential of each key control point of the pipeline under different output currents is calculated;

[0089] Based on the ratio of potential to output current, the control coefficient of the potentiostat installed at each key control point is determined.

[0090] This application also provides a pipeline multi-point control device under ultra-high voltage direct current interference. The multi-point control device includes a processor, a memory, and a computer program stored in the memory and executable by the processor. When the computer program is executed by the processor, it implements the steps of a pipeline multi-point control method under ultra-high voltage direct current interference as described in the above embodiments.

[0091] In this embodiment, a computer-readable storage medium is also provided. This computer-readable storage medium is a memory device in a computer device used to store programs and data. It is understood that the computer-readable storage medium here can include both the built-in storage medium in the computer device and extended storage media supported by the computer device. The computer-readable storage medium provides storage space that stores the operating system of the terminal. Furthermore, this storage space also stores one or more instructions suitable for loading and execution by a processor. These instructions can be one or more computer programs (including program code). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk storage device. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the corresponding steps of the above embodiment regarding a method for multi-point control of pipelines under ultra-high voltage direct current interference. Those skilled in the art should understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention 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.

[0092] 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 description is only a specific embodiment of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A method for multi-point control of pipelines under ultra-high voltage direct current interference, characterized in that the method... include: Obtain the status parameters of the pipeline that is not equipped with a potentiostat; The state parameters are input into a pre-constructed first function mapping relationship, and the output is the potential distribution of the pipeline without a potentiostat installed; where the first function mapping relationship refers to the correlation between the potential distribution along the pipeline and the state parameters; Based on the potential distribution, and taking the zero potential point as a reference, several key control points for installing a potentiostat on the pipeline are determined. Determine the control coefficient of the potentiostat installed at each key control point; The particle swarm optimization algorithm is used to randomly select the output current of the potentiostat to obtain the random selection result of the output current. Based on the random selection result and the control coefficient, the potential of each key control point is calculated. Based on the potential of each key control point, the potential variance along the pipeline is calculated. When the potential variance along the pipeline is minimized and the potential constraint condition is met, the optimal output current of the potentiostat is obtained. The output of the potentiostat is adjusted based on the optimal output current.

2. The method according to claim 1, characterized in that, The status parameters include pipeline parameters, interference source parameters, and environmental parameters.

3. The method according to claim 1, characterized in that, Determine the control coefficients of the potentiostat installed at each critical control point, including: By changing the output current of the potentiostat at each critical control point, the potential of each critical control point in the pipeline under different output currents is measured. Based on the ratio of potential to output current, the control coefficient of the potentiostat installed at each key control point is determined.

4. The method according to claim 1, characterized in that, Determine the control coefficients of the potentiostat installed at each critical control point, including: In the first function mapping relationship, the output current of the potentiostat is introduced to construct the second function mapping relationship; the second function mapping relationship refers to the correlation between the potential distribution along the pipeline and the state parameters and the output current. Based on the mapping relationship of the second function, the potential of each key control point of the pipeline under different output currents is calculated; Based on the ratio of potential to output current, the control coefficient of the potentiostat installed at each key control point is determined.

5. The method according to claim 1, characterized in that, The expression for minimizing the potential variance at key control points along the pipeline is: min(V²-V). 2 +(V3-V) 2 +……+(V N -V) 2 Where N represents the number of critical control points, and V N V represents the potential of the Nth critical control point, and V represents the standard value of the potential.

6. The method according to claim 1, characterized in that, The potential constraint condition is that the sum of the potentials at each critical control point is greater than or equal to -3 volts and less than or equal to -0.5 volts.

7. A multi-point control device for pipelines under ultra-high voltage direct current interference, characterized in that, The device includes: The parameter acquisition module is used to acquire the status parameters of pipes that are not equipped with a potentiostat. The potential distribution determination module is used to input state parameters into a pre-constructed first function mapping relationship and output the potential distribution of the pipeline without a potentiostat installed; wherein the first function mapping relationship refers to the correlation between the potential distribution along the pipeline and the state parameters; The installation point selection module is used to determine multiple key control points for installing a potentiostat on the pipeline based on the potential distribution and with the zero potential point as a reference. The control coefficient determination module is used to determine the control coefficient of the potentiostat installed at each key control point. The optimization module is used to randomly select the output current of the potentiostat using the particle swarm optimization algorithm, obtain the random selection result of the output current, calculate the potential of each key control point based on the random selection result and the control coefficient, calculate the potential variance along the pipeline based on the potential of each key control point, and obtain the optimal output current of the potentiostat when the potential variance along the pipeline is minimized and the potential constraint condition is met. The control module is used to control the output of the potentiostat based on the optimal output current.

8. The apparatus according to claim 7, characterized in that, The control coefficient determination module is also specifically used for: By changing the output current of the potentiostat at each critical control point, the potential of each critical control point in the pipeline under different output currents is measured. Based on the ratio of potential to output current, the control coefficient of the potentiostat installed at each key control point is determined.

9. The apparatus according to claim 7, characterized in that, The control coefficient determination module is also specifically used for: In the first function mapping relationship, the output current of the potentiostat is introduced to construct the second function mapping relationship; the second function mapping relationship refers to the correlation between the potential distribution along the pipeline and the state parameters and the output current. Based on the mapping relationship of the second function, the potential of each key control point of the pipeline under different output currents is calculated; Based on the ratio of potential to output current, the control coefficient of the potentiostat installed at each key control point is determined.

10. A multi-point control device for pipelines under ultra-high voltage direct current interference, characterized in that, The multi-point control device includes a processor, a memory, and a computer program stored in the memory and executable by the processor, wherein when the computer program is executed by the processor, it implements the steps of a multi-point control method for pipelines under ultra-high voltage direct current interference as described in any one of claims 1 to 7.

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