Intelligent control method for line cathodic protection

Abstract

A method for intelligent control of cathodic protection of a pipeline includes natural potential acquisition, influence testing, influence setting, system operation, operation data acquisition, data analysis, system adjustment, adjustment mode analysis, conventional constant current adjustment, interference constant current adjustment, conventional constant current cut-off adjustment, interference constant current cut-off adjustment, conventional constant current adjustment, and interference constant current adjustment. Before adjusting the potentiostat, this invention performs data analysis to determine whether the potential fluctuation amplitude used as the control basis is too large and whether the degree of stray current interference has a significant impact. This allows the potentiostat to select a more suitable operating mode and adjustment method, making the operating mode and control basis of the potentiostat more reasonable. It can eliminate the negative impact of stray current on the control of the potentiostat, solving the problems of unreasonable control basis, stray current interference, and unreasonable operating mode existing in the current control methods of potentiostats along pipelines.

Description

Technical Field

[0001] This invention belongs to the field of cathodic protection and corrosion prevention technology, and particularly relates to an intelligent control method for line cathodic protection. Background Technology

[0002] Multiple potentiostats are installed along the pipeline. The operating mode of the potentiostats is basically constant potential (energized potential or de-energized potential). In this operating mode, the potentiostat first sets a preset potential. The potentiostat uses the energized point as the sampling control point and adjusts the output current of the potentiostat according to the difference between the actual protection potential measured at the sampling control point and the preset potential, so that the protection potential reaches the preset potential.

[0003] The pipelines protected by the potentiostat range in length from tens to hundreds of kilometers. It is unreasonable to rely solely on the potential at the sampling control point as the basis for the potentiostat's output control.

[0004] First, the uneven soil environment and corrosion protection quality along the pipeline lead to inconsistent cathodic protection current distribution. The potential at the energized point cannot accurately reflect the protection potential along the pipeline, and the potentiostat cannot be adjusted in real time according to the actual protection situation.

[0005] Secondly, the cathodic protection range of the line is long, and there are many stray current interference sources along the pipeline. The stray current interference causes fluctuations or abnormalities in the protection potential along the line, and the potentiostat cannot adjust it in real time according to the interference situation.

[0006] Furthermore, the potential fluctuations caused by dynamic stray current interference at the sampling control point often prevent the constant potential mode from operating normally. The constant potential meter will automatically switch to the constant current operating mode. However, the preset value of the constant current operating mode is fixed without human intervention, which means that the constant potential meter cannot adjust in real time according to the line protection status.

[0007] Finally, in certain dynamic stray current interference environments, such as subway interference, the interference period is relatively fixed. In this case, the potentiostat should adjust its operating mode in a timely manner according to whether there is interference. Traditional potentiostats require manual adjustment, and the timeliness of the adjustment is difficult to guarantee. Summary of the Invention

[0008] To address the shortcomings of related technologies, this invention provides an intelligent control method for line cathodic protection, which solves the problems of unreasonable control basis, stray current interference, and unreasonable working mode in the current control method of constant potential meters along pipelines.

[0009] This invention provides an intelligent control method for line cathodic protection, characterized by comprising the following steps:

[0010] Natural potential acquisition: Data is collected from monitoring points A1 to A2 along the pipeline. m The natural potential;

[0011] Impact testing: Potentiostatic meters C1~C along the pipeline n The test runs are performed sequentially according to the set output current, with only one potentiostat running at a time. Data is collected at detection points A1 to A2 during the test run of each potentiostat. m The power-off potential is determined, and the test potential difference ΔV between it and the corresponding natural potential is calculated. text ;

[0012] Influence setting: Extract all test potential differences ΔV corresponding to a potentiostat. text , will ΔV text Test points whose absolute value is greater than or equal to the first influence threshold are set as Class A test points, and the other potentiostats obtain their corresponding Class A test points in the same way as described above.

[0013] System operation: Potentiostat C1~C n All will run according to the corresponding set operating mode until the set initial operating parameters are reached;

[0014] Operational data acquisition: Data collection from monitoring points A1 to A2 along the pipeline. m The power-off potential, and the test stakes B1 to B1 corresponding to each potentiostat. n The on-state potential and the off-state potential;

[0015] Data analysis: Data acquisition using potentiostat C1~C n The operating mode of the potentiostat is calculated, and C1~C2 are calculated. n Calculate the potentiostat C1~C2 based on the first coefficient of variation CV1 and the second coefficient of variation CV2. n Calculate the third coefficient of variation CV3 for the corresponding Class A test points, and calculate the potentiostat C1~C n The first interference coefficient Y; where the first coefficient of variation CV1 is the ratio of the standard deviation to the average value of the energized potential measured by the potentiostat at its corresponding test pile within m operating cycles, the second coefficient of variation CV2 is the ratio of the standard deviation to the average value of the de-energized potential measured by the potentiostat at its corresponding test pile within m operating cycles, the third coefficient of variation CV3 is the ratio of the standard deviation to the average value of the de-energized potential measured by the Class A test point within m operating cycles, and the first interference coefficient Y is the ratio of the Class A test points whose third coefficient of variation CV3 exceeds the first analysis threshold to the total number of Class A test points;

[0016] System adjustment: Adjust potentiostats C1 to C2 sequentially. n Perform regulation mode analysis;

[0017] Regulation mode analysis:

[0018] If the potentiostat operates in constant current potential mode and the first interference coefficient Y is less than or equal to the first interference threshold, then the regular constant current adjustment procedure is performed.

[0019] If the potentiostat operates in constant current mode, the first coefficient of variation CV1 is less than or equal to the first variation threshold, the second coefficient of variation CV2 is greater than the second variation threshold, and the first interference coefficient Y is less than or equal to the first interference threshold, then the potentiostat switches to constant current potential mode and performs the routine constant current adjustment steps.

[0020] If the potentiostat operates in constant current potential mode and the first interference coefficient Y is greater than the first interference threshold, then the interference constant current adjustment step is performed.

[0021] If the potentiostat operates in constant current mode, the first coefficient of variation CV1 is less than or equal to the first variation threshold, the second coefficient of variation CV2 is greater than the second variation threshold, and the first interference coefficient Y is greater than the first interference threshold, then the potentiostat switches to constant current potential mode and performs interference constant current adjustment steps.

[0022] If the potentiostat operates in constant power-off potential mode, and the first interference coefficient Y is less than or equal to the first interference threshold, then the regular constant power-off adjustment procedure is performed.

[0023] If the potentiostat operates in constant current mode, the second coefficient of variation CV2 is less than or equal to the second variation threshold, and the first interference coefficient Y is less than or equal to the first interference threshold, then the potentiostat switches to constant power-off potential mode and performs the routine constant power-off adjustment steps.

[0024] If the potentiostat operates in constant off-voltage mode and the first interference coefficient Y is greater than the first interference threshold, then the interference constant off-voltage adjustment step is performed.

[0025] If the potentiostat operates in constant current mode, the second coefficient of variation CV2 is less than or equal to the second variation threshold, and the first interference coefficient Y is greater than the first interference threshold, then the potentiostat switches to constant off-potential mode and performs interference constant off-potential adjustment steps.

[0026] If the potentiostat is in constant current mode, the first coefficient of variation CV1 is greater than the first variation threshold, the second coefficient of variation CV2 is greater than the second variation threshold, and the first interference coefficient Y is less than or equal to the first interference threshold, then the conventional constant current adjustment steps are performed.

[0027] If the potentiostat operates in constant current mode, and the first coefficient of variation CV1 is greater than the first variation threshold, the second coefficient of variation CV2 is greater than the second variation threshold, and the first interference coefficient Y is greater than the first interference threshold, then the interference constant current adjustment step is performed.

[0028] Routine constant current adjustment: If the de-energized potential of the Class A test point of the potentiostat is not up to standard, calculate the routine current potential difference between the de-energized potential of the Class A test point that is not up to standard and the closest compliant potential. Multiply the routine current potential difference by the current adjustment coefficient to obtain the routine current simulated adjustment amount. The routine current simulated adjustment amount with the smallest absolute value is taken as the routine current potential adjustment amount. The potentiostat adjusts its preset current potential according to the routine current potential adjustment amount.

[0029] Interference Constant Current Adjustment: If the power-off potential of the Class A test point of the potentiostat is under-protected, the first interference current potential difference between the power-off potential of the under-protected Class A test point and the closest compliant potential is calculated. The first interference current potential difference is multiplied by the current adjustment coefficient to obtain the first interference current simulated adjustment amount. The first interference current simulated adjustment amount with the smallest absolute value is taken as the first interference current potential adjustment amount. The potentiostat adjusts its preset current potential according to the first interference current potential adjustment amount. If the power-off potential of the Class A test point of the potentiostat is not under-protected but is over-protected, the second interference current potential difference between the power-off potential of the over-protected Class A test point and the closest compliant potential is calculated. The second interference current potential difference is multiplied by the current adjustment coefficient to obtain the second interference current simulated adjustment amount. The second interference current simulated adjustment amount with the smallest absolute value is taken as the second interference current potential adjustment amount. The potentiostat adjusts its preset current potential according to the second interference current potential adjustment amount.

[0030] Routine power-off adjustment: If the power-off potential of the Class A test point of the potentiostat is not up to standard, calculate the routine power-off potential difference between the power-off potential of the substandard Class A test point and the closest compliant potential. Multiply the routine power-off potential difference by the power-off adjustment coefficient to obtain the routine power-off simulation adjustment amount. The routine power-off simulation adjustment amount with the smallest absolute value is taken as the routine power-off potential adjustment amount. The potentiostat adjusts its preset power-off potential according to the routine power-off simulation adjustment amount.

[0031] Interference Power-Off Adjustment: If the power-off potential of the Class A test point of the potentiostat is underprotected, the first interference power-off potential difference between the underprotected Class A test point and the closest compliant potential is calculated. The first interference power-off potential difference is multiplied by the power-off adjustment coefficient to obtain the first interference power-off simulated adjustment amount. The first interference power-off simulated adjustment amount with the smallest absolute value is taken as the first interference power-off potential adjustment amount. The potentiostat adjusts its preset power-off potential according to the first interference power-off potential adjustment amount. If the power-off potential of the Class A test point of the potentiostat is not underprotected but is overprotected, the second interference power-off potential difference between the overprotected Class A test point and the closest compliant potential is calculated. The second interference power-off potential difference is multiplied by the power-off adjustment coefficient to obtain the second interference power-off simulated adjustment amount. The second interference power-off simulated adjustment amount with the smallest absolute value is taken as the second interference power-off potential adjustment amount. The potentiostat adjusts its preset power-off potential according to the second interference power-off potential adjustment amount.

[0032] Routine constant current adjustment: If the de-energization potential of the Class A test point of the potentiostat is not up to standard, the rated output current of the potentiostat is multiplied by the constant current adjustment coefficient to obtain the routine current adjustment amount, and the potentiostat adjusts its output current according to the routine current adjustment amount.

[0033] Interference constant current adjustment: If the de-energization potential of the Class A test point of the potentiostat is not up to standard, the rated output current of the potentiostat is multiplied by the constant current adjustment coefficient to obtain the conventional current adjustment amount, and the potentiostat adjusts its output current according to the conventional current adjustment amount.

[0034] In some embodiments, after the data acquisition step, a compliance comparison step is further included;

[0035] Comparison of standards: Test points A1 to A2 m The collected power-off potentials are compared with the compliant potential range. If the power-off potentials of all detection points are within the compliant potential range, the potentials are compliant, and each potentiostat maintains its current operation. If the power-off potential of any detection point is outside the compliant potential range, the potentials are not compliant, and the data analysis step is performed.

[0036] In some embodiments, the data analysis step further includes calculating the potentiostat C1 to C2. n The second interference coefficient X; where the second interference coefficient X is the ratio of the number of Class A test points whose power failure potential exceeds the second analysis threshold for n consecutive operating cycles within m operating cycles to the total number of Class A test points, n < m;

[0037] In the adjustment mode analysis step, the first interference coefficient Y being less than or equal to the first interference threshold is replaced with the first interference coefficient Y being less than or equal to the first interference threshold and the second interference coefficient X being less than or equal to the second interference threshold; the first interference coefficient Y being greater than the first interference threshold is replaced with the first interference coefficient Y being greater than the first interference threshold or the second interference coefficient X being greater than the second interference threshold.

[0038] In some embodiments, in the influence setting step, ΔV text Test points whose absolute value is less than the first influence threshold and greater than or equal to the second influence threshold are set as Class B test points, where the first influence threshold is greater than the second influence threshold.

[0039] The conventional constant current adjustment procedure is replaced as follows: If the de-energized potential of the Class A and Class B test points of the potentiostat is not up to standard, calculate the first conventional current-on potential difference and the second conventional current-on potential difference between the de-energized potential of the Class A and Class B test points that are not up to standard and the closest compliant potential. Multiply the first conventional current-on potential difference and the second conventional current-on potential difference by the first current-on adjustment coefficient and the second current-on adjustment coefficient respectively to obtain the conventional current-on simulated adjustment amount. The conventional current-on simulated adjustment amount with the smallest absolute value is taken as the conventional current-on potential adjustment amount. The potentiostat adjusts its preset current-on potential according to the conventional current-on potential adjustment amount.

[0040] The conventional constant power-off adjustment procedure is replaced as follows: If the power-off potential of the Class A and Class B test points of the potentiostat is not up to standard, calculate the first conventional power-off potential difference and the second conventional power-off potential difference between the power-off potential of the non-compliant Class A and Class B test points and the closest compliant potential. Multiply the first conventional power-off potential difference and the second conventional power-off potential difference by the first power-off adjustment coefficient and the second power-off adjustment coefficient respectively to obtain the conventional power-off simulation adjustment amount. Take the conventional power-off simulation adjustment amount with the smallest absolute value as the conventional power-off potential adjustment amount. The potentiostat adjusts its preset power-off potential according to the conventional power-off simulation adjustment amount.

[0041] The conventional constant current adjustment procedure is replaced as follows: If the de-energization potential of the Class A and Class B test points of the potentiostat is not up to standard, the rated output current of the potentiostat is multiplied by the constant current adjustment coefficient corresponding to the type of test point that is not up to standard to obtain the conventional current analog quantity. The conventional current adjustment quantity is obtained by taking the conventional current analog quantity with the smallest absolute value. The potentiostat adjusts its output current according to the conventional current adjustment quantity.

[0042] In some embodiments, the first power-on adjustment coefficient is greater than the second power-on adjustment coefficient, the first power-off adjustment coefficient is greater than the second power-off adjustment coefficient, and the constant current adjustment coefficient corresponding to the type A test point is greater than the constant current adjustment coefficient corresponding to the type B test point.

[0043] In some embodiments, an AC interference analysis step is further included prior to the modulation mode analysis;

[0044] AC interference analysis: If the de-energization potential of the Class A test points of the potentiostat meets the standard, and there is an AC current density in the Class A test points that is greater than the AC threshold, then perform the AC interference adjustment step and set the Class A test points with AC current density greater than the AC threshold as Class P test points.

[0045] AC interference adjustment: The potentiostat operates according to the current operating mode. If the AC current density of the P-type test point is less than or equal to the DC threshold, the potentiostat maintains the current operating state. If the AC current density of the P-type test point is greater than the DC threshold, the compliant potential range used in subsequent steps is -0.9V to -1.15V.

[0046] In some embodiments, in the influence setting step, ΔV text Test points whose absolute value is less than the first influence threshold and greater than or equal to the second influence threshold are set as Class B test points, where the first influence threshold is greater than the second influence threshold.

[0047] The AC interference analysis steps are replaced as follows: If the de-energization potentials of both Class A and Class B test points of the potentiostat meet the standards, and there is an AC current density greater than the AC threshold in Class A and Class B test points, then an AC interference adjustment step is performed, and the Class A and Class B test points with AC current densities greater than the AC threshold are set as Class P test points.

[0048] Based on the above technical solution, before adjusting the potentiostat, the embodiments of the present invention first perform data analysis to determine whether the potential fluctuation amplitude used as the control basis is too large, and whether the degree of interference from stray current has a significant impact. This allows the potentiostat to select a more suitable operating mode and adjustment method, making the operating mode and control basis of the potentiostat more reasonable. It can eliminate the negative impact of stray current on the control of the potentiostat, and solve the problems of unreasonable control basis, stray current interference, and unreasonable working mode in the current control methods of potentiostats along pipelines. Attached Figure Description

[0049] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0050] Figure 1 This is a flowchart illustrating the operation of the intelligent control method for line cathodic protection according to the present invention. Detailed Implementation

[0051] The technical solutions in 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 a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0052] In the description of this invention, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0053] The terms "first," "second," and "third" 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," "second," or "third" may explicitly or implicitly include one or more of that feature.

[0054] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0055] like Figure 1 As shown in the schematic embodiment of the intelligent control method for line cathodic protection of the present invention, the intelligent control method for line cathodic protection includes natural potential acquisition, influence test, influence setting, system operation, operation data acquisition, data analysis, system adjustment, adjustment mode analysis, conventional constant current adjustment, interference constant current adjustment, conventional constant current cut-off adjustment, interference constant current cut-off adjustment, conventional constant current adjustment, and interference constant current adjustment.

[0056] Potentiostats C1 to C1 are installed along the pipeline. n and test piles B1 to B n The number of potentiostats is the same as the number of test stakes, so a test stake is set at the location of each potentiostat to detect the on-state and off-state potentials of the pipeline at the location of the potentiostat. Detection points A1 to A2 are also set along the pipeline. mEach testing point also has its natural potential and power failure potential measured by a test pile.

[0057] Natural potential was collected by using test stakes along the pipeline at test points A1 to A2. m The natural potential. An influence test was conducted using potentiostats C1 to C1 along the pipeline. n The potentiostats are tested sequentially according to the set output current. When one potentiostat reaches the set test duration, it stops running, and the next potentiostat begins its test run. That is, only one potentiostat is tested at a time. Data is collected at detection points A1 to A1 when each potentiostat reaches the set test duration. m The power-off potential is determined, and the test potential difference ΔV between it and the corresponding natural potential is calculated. text The influence setting is performed, and all test potential differences ΔV corresponding to a potentiostat are extracted. text , will ΔV text Test points whose absolute value is greater than or equal to the first influence threshold are set as Class A test points, and the other potentiostats obtain their corresponding Class A test points in the same way as described above.

[0058] To run the system, use potentiostats C1 to C2. n All systems operate according to their respective preset operating modes until the set initial operating parameters are reached. These initial operating parameters include preset energizing potential, preset de-energizing potential, and preset output current. Operating data is collected from monitoring points A1 to A2 along the pipeline. m The power-off potential, and the test stakes B1 to B1 corresponding to each potentiostat. n The on-state potential and the off-state potential.

[0059] Data analysis was performed, and data was collected from potentiostat C1 to C1. n The operating mode of the potentiostat is calculated, and C1~C2 are calculated. n Calculate the potentiostat C1~C2 based on the first coefficient of variation CV1 and the second coefficient of variation CV2. n Calculate the third coefficient of variation CV3 for the corresponding Class A test points, and calculate the potentiostat C1~C n The first interference coefficient Y.

[0060] Because it needs to detect the power-off potential, the potentiostat needs to operate according to a set operating cycle. Within the operating cycle, the potentiostat needs to run for a set period of time and then be powered off for a set period of time. Potentiostat C1~C n They run synchronously according to the same operating cycle.

[0061] The first coefficient of variation, CV1, is the ratio of the standard deviation to the average value of the energized potential measured at the corresponding test point by the potentiostat over m operating cycles. CV1 reflects the fluctuation of the energized potential on the pipeline at the current location of the potentiostat. The second coefficient of variation, CV2, is the ratio of the standard deviation to the average value of the de-energized potential measured at the corresponding test point by the potentiostat over m operating cycles. CV2 reflects the fluctuation of the de-energized potential on the pipeline at the current location of the potentiostat. The third coefficient of variation, CV3, is the ratio of the standard deviation to the average value of the de-energized potential measured at Class A test points over m operating cycles. The first interference coefficient, Y, is the ratio of Class A test points whose third coefficient of variation, CV3, exceeds the first analysis threshold to the total number of Class A test points. This ratio reflects the degree of dynamic stray current interference at the test points with higher influence corresponding to the current potentiostat. Here, m is a non-zero natural number.

[0062] Perform system adjustments, sequentially adjusting potentiostats C1 to C1. n Perform adjustment mode analysis. Based on the current operating mode of the potentiostat, the degree of potential fluctuation, and the degree of dynamic stray current interference, determine the adjustment mode of the potentiostat.

[0063] In the adjustment mode analysis step, if the potentiostat operates in constant current potential mode and the first interference coefficient Y is less than or equal to the first interference threshold, then the conventional constant current adjustment step is performed. The fact that the first interference coefficient Y is less than or equal to the first interference threshold indicates that the dynamic stray current interference experienced by the detection point with a higher degree of influence corresponding to the potentiostat is relatively small. Therefore, the conventional constant current adjustment step, which uses the Class A detection point with a higher degree of influence as the adjustment basis, is more reasonable, the adjustment basis is more accurate, and it can adjust the pipeline potential to the optimal cathodic protection state.

[0064] In the adjustment mode analysis step, if the potentiostat operates in constant current mode, the first coefficient of variation CV1 is less than or equal to the first variation threshold, the second coefficient of variation CV2 is greater than the second variation threshold, and the first interference coefficient Y is less than or equal to the first interference threshold, then the potentiostat switches to constant current potential mode and performs the routine constant current adjustment steps. The fact that the first coefficient of variation CV1 is less than or equal to the first variation threshold and the second coefficient of variation CV2 is greater than the second variation threshold indicates that the potential fluctuation at the location of the potentiostat is small, while the potential fluctuation after de-energization is large. Using the constant current potential mode allows the pipeline to achieve the optimal cathodic protection state. The fact that the first interference coefficient Y is less than or equal to the first interference threshold indicates that the dynamic stray current interference at the detection point with a higher degree of influence corresponding to the potentiostat is small. After switching the operating mode, using the Class A detection point with a higher degree of influence as the adjustment basis for the routine constant current adjustment steps is more reasonable, the adjustment basis is more accurate, and it can adjust the pipeline potential to the optimal cathodic protection state.

[0065] In the adjustment mode analysis step, if the potentiostat operates in constant current potential mode and the first interference coefficient Y is greater than the first interference threshold, then the constant current interference adjustment step is performed. If the first interference coefficient Y is greater than the first interference threshold, it indicates that the dynamic stray current interference experienced by the detection points with higher impact on the potentiostat is significant. Using all Class A detection points as the adjustment basis is unreasonable. The adjustment basis needs to be selected based on the non-compliance of Class A detection points in the constant current interference step, making the potentiostat's adjustment basis more reasonable. After adjustment, the pipeline potential can be adjusted to the optimal cathodic protection state.

[0066] In the adjustment mode analysis step, if the potentiostat operates in constant current mode, the first coefficient of variation CV1 is less than or equal to the first variation threshold, the second coefficient of variation CV2 is greater than the second variation threshold, and the first interference coefficient Y is greater than the first interference threshold, then the potentiostat switches to constant current potential mode and performs an interference constant current adjustment step. The fact that the first coefficient of variation CV1 is less than or equal to the first variation threshold and the second coefficient of variation CV2 is greater than the second variation threshold indicates that the potential fluctuation at the location of the potentiostat is small, while the potential fluctuation after de-energization is large. Using the constant current potential mode allows the pipeline to achieve optimal cathodic protection. The fact that the first interference coefficient Y is greater than the first interference threshold indicates that the dynamic stray current interference at the detection points with higher impact on the potentiostat is significant. Using all Class A detection points as the adjustment basis is unreasonable. In the interference constant current step, the adjustment basis needs to be selected based on the non-compliance of the Class A detection points to make the potentiostat adjustment basis more reasonable. After adjustment, the pipeline potential can be adjusted to the optimal cathodic protection state.

[0067] In the adjustment mode analysis step, if the potentiostat operates in constant off-voltage mode and the first interference coefficient Y is less than or equal to the first interference threshold, then the conventional constant off-voltage adjustment step is performed. The fact that the first interference coefficient Y is less than or equal to the first interference threshold indicates that the dynamic stray current interference experienced by the detection point with a higher degree of influence corresponding to the potentiostat is relatively small. Therefore, using the Class A detection point with a higher degree of influence as the basis for adjustment in the conventional constant off-voltage adjustment step is reasonable, the adjustment basis is accurate, and it can adjust the pipeline potential to the optimal cathodic protection state.

[0068] In the adjustment mode analysis step, if the potentiostat operates in constant current mode, the second coefficient of variation CV2 is less than or equal to the second variation threshold, and the first interference coefficient Y is less than or equal to the first interference threshold, then the potentiostat switches to constant off-voltage mode and performs the routine constant off-voltage adjustment steps. The second coefficient of variation CV2 being less than or equal to the second variation threshold indicates that the off-voltage fluctuation at the location of the potentiostat is small, and using the constant off-voltage mode allows the pipeline to achieve optimal cathodic protection. The first interference coefficient Y being less than or equal to the first interference threshold indicates that the dynamic stray current interference at the detection point with a high degree of influence corresponding to the potentiostat is small. After switching the operating mode, using the Class A detection point with a high degree of influence as the adjustment basis for the routine constant off-voltage adjustment steps is more reasonable, the adjustment basis is more accurate, and it can adjust the pipeline potential to the optimal cathodic protection state.

[0069] In the adjustment mode analysis step, if the potentiostat operates in constant off-voltage mode and the first interference coefficient Y is greater than the first interference threshold, then the constant off-voltage interference adjustment step is performed. If the first interference coefficient Y is greater than the first interference threshold, it indicates that the dynamic stray current interference experienced by the detection points with higher impact on the potentiostat is significant. Using all Class A detection points as the adjustment basis is unreasonable. In the constant off-voltage interference step, the adjustment basis needs to be selected based on the non-compliance of Class A detection points to make the potentiostat's adjustment basis more reasonable. After adjustment, the pipeline potential can be adjusted to the optimal cathodic protection state.

[0070] In the adjustment mode analysis step, if the potentiostat operates in constant current mode, the second coefficient of variation CV2 is less than or equal to the second variation threshold, and the first interference coefficient Y is greater than the first interference threshold, then the potentiostat switches to constant off-voltage mode and performs an interference constant off-voltage adjustment step. The second coefficient of variation CV2 being less than or equal to the second variation threshold indicates that the off-voltage fluctuation at the location of the potentiostat is small, and using constant off-voltage mode allows the pipeline to achieve optimal cathodic protection. The first interference coefficient Y being greater than the first interference threshold indicates that the dynamic stray current interference at the detection points with higher impact corresponding to the potentiostat is significant. Using all Class A detection points as the adjustment basis is unreasonable. In the interference constant off-voltage step, the adjustment basis needs to be selected based on the non-compliance of Class A detection points to make the potentiostat's adjustment basis more reasonable, and after adjustment, the pipeline potential can be adjusted to the optimal cathodic protection state.

[0071] In the adjustment mode analysis step, if the potentiostat operates in constant current mode, the first coefficient of variation CV1 is greater than the first variation threshold, the second coefficient of variation CV2 is greater than the second variation threshold, and the first interference coefficient Y is less than or equal to the first interference threshold, then the conventional constant current adjustment step is performed. If the first coefficient of variation CV1 is greater than the first variation threshold and the second coefficient of variation CV2 is greater than the second variation threshold, it indicates that the on-state and off-state potentials at the location of the potentiostat fluctuate significantly. Maintaining the constant current operating mode ensures the pipeline achieves optimal cathodic protection.

[0072] In the adjustment mode analysis step, if the potentiostat operates in constant current mode, and the first coefficient of variation CV1 is greater than the first variation threshold or the second coefficient of variation CV2 is greater than the second variation threshold, and the first interference coefficient Y is greater than the first interference threshold, then the interference constant current adjustment step is performed. If the first coefficient of variation CV1 is greater than the first variation threshold and the second coefficient of variation CV2 is greater than the second variation threshold, it indicates that the on-state and off-state potentials at the location of the potentiostat fluctuate significantly. Maintaining the constant current operating mode allows the pipeline to achieve optimal cathodic protection.

[0073] When performing routine constant current adjustment, if the de-energized potential of the Class A test point of the potentiostat is not up to standard, the routine current potential difference between the de-energized potential of the Class A test point that is not up to standard and the closest compliant potential is calculated. The routine current potential difference is multiplied by the current adjustment coefficient to obtain the routine current simulated adjustment amount. The routine current simulated adjustment amount with the smallest absolute value is taken as the routine current potential adjustment amount. The potentiostat adjusts its preset current potential according to the routine current potential adjustment amount.

[0074] When adjusting the constant current for interference, if the de-energized potential of the Class A test point of the potentiostat is under-protected, the first interference current potential difference between the de-energized potential of the under-protected Class A test point and the closest compliant potential is calculated. This first interference current potential difference is multiplied by the current adjustment coefficient to obtain the first interference current simulated adjustment amount. The first interference current simulated adjustment amount with the smallest absolute value is taken as the first interference current potential adjustment amount, and the potentiostat adjusts its preset current potential according to this first interference current potential adjustment amount. If the de-energized potential of the Class A test point of the potentiostat is not under-protected but is over-protected, the second interference current potential difference between the de-energized potential of the over-protected Class A test point and the closest compliant potential is calculated. This second interference current potential difference is multiplied by the current adjustment coefficient to obtain the second interference current simulated adjustment amount. The second interference current simulated adjustment amount with the smallest absolute value is taken as the second interference current potential adjustment amount, and the potentiostat adjusts its preset current potential according to this second interference current potential adjustment amount.

[0075] When performing routine constant power-off adjustment, if the power-off potential of the Class A test point of the potentiostat is not up to standard, the routine power-off potential difference between the power-off potential of the Class A test point that is not up to standard and the closest compliant potential is calculated. The routine power-off potential difference is multiplied by the power-off adjustment coefficient to obtain the routine power-off simulation adjustment amount. The routine power-off simulation adjustment amount with the smallest absolute value is taken as the routine power-off potential adjustment amount. The potentiostat adjusts its preset power-off potential according to the routine power-off simulation adjustment amount.

[0076] When adjusting for interference constant power outage, if the power outage potential of the Class A test point of the potentiostat is underprotected, the first interference power outage potential difference between the underprotected Class A test point and the closest compliant potential is calculated. This first interference power outage potential difference is multiplied by the power outage adjustment coefficient to obtain the first interference power outage simulated adjustment amount. The first interference power outage simulated adjustment amount with the smallest absolute value is taken as the first interference power outage potential adjustment amount, and the potentiostat adjusts its preset power outage potential according to this first interference power outage potential adjustment amount. If the power outage potential of the Class A test point of the potentiostat is not underprotected but is overprotected, the second interference power outage potential difference between the overprotected Class A test point and the closest compliant potential is calculated. This second interference power outage potential difference is multiplied by the power outage adjustment coefficient to obtain the second interference power outage simulated adjustment amount. The second interference power outage simulated adjustment amount with the smallest absolute value is taken as the second interference power outage potential adjustment amount, and the potentiostat adjusts its preset power outage potential according to this second interference power outage potential adjustment amount.

[0077] When performing routine constant current adjustment, if the de-energization potential of the Class A test point of the potentiostat is not up to standard, the rated output current of the potentiostat is multiplied by the constant current adjustment coefficient as the routine current adjustment amount, and the potentiostat adjusts its output current according to the routine current adjustment amount.

[0078] When adjusting the constant current during interference, if the de-energization potential of the Class A test point of the potentiostat is not up to standard, the rated output current of the potentiostat is multiplied by the constant current adjustment coefficient to obtain the normal current adjustment amount, and the potentiostat adjusts its output current according to the normal current adjustment amount.

[0079] After one potentiostat completes the adjustment of the preset potential or output current, the next potentiostat performs adjustment mode analysis and follows the corresponding adjustment steps based on the analysis results. The potentiostats perform adjustment mode analysis and adjustment steps one by one. When the last potentiostat completes the adjustment of the preset potential or output current, the potentiostats C1 to C2 along the pipeline... n After completing one round of adjustments, return to the data acquisition step and repeat the cycle.

[0080] In the above illustrative embodiment, the Class A detection points corresponding to each potentiostat are first obtained through test runs. Then, data analysis is used to obtain the fluctuation levels of the on-state potential and off-state potential at each potentiostat location, as well as the degree of interference from dynamic stray currents on the off-state potential of the Class A detection points. Different adjustment methods are selected based on the potential fluctuation level and interference level: a constant on-state potential working mode is used when the on-state potential fluctuation is small and the off-state potential fluctuation is large; a constant off-state potential working mode is used when the off-state potential fluctuation is small; and a constant current working mode is used when both the on-state and off-state potential fluctuations are large. Furthermore, dynamic... When the dynamic stray current interference is small, the difference between all non-compliant Class A detection points and the compliant potential range is used as the adjustment basis. When the dynamic stray current interference is large, the difference between the non-compliant Class A detection points and the compliant potential range is selectively used as the adjustment basis. This allows the potentiostat to adopt a more reasonable working mode and adjustment basis in various adjustment methods, which can eliminate the influence of external interference on the control of the potentiostat and enable the pipeline to achieve the best cathodic protection state after adjustment. This solves the problems of unreasonable control basis, stray current interference, and unreasonable working mode of the current control method of the potentiostat along the pipeline.

[0081] The on-state and off-state potentials on a pipeline can largely reflect the cathodic protection status of the pipeline. Compared to the constant current operating mode where the potentiostat outputs a fixed current, the constant on-state potential and constant off-state potential operating modes, which use the on-state and off-state potentials as control criteria, can ensure that the pipeline is in the optimal cathodic protection state to the greatest extent. In the adjustment mode analysis step, when the on-state or off-state potential fluctuations at the location of the potentiostat are small, switching the potentiostat from the constant current operating mode to the constant on-state potential or constant off-state potential operating mode can ensure that the control basis of the operating mode after the switch is accurate, while maximizing the cathodic protection state of the pipeline.

[0082] The first influence threshold, first analysis threshold, first interference threshold, first variation threshold, second variation threshold, power-on adjustment coefficient, power-off adjustment coefficient, and constant current adjustment coefficient are all manually set. To avoid excessively large adjustment steps, the power-on adjustment coefficient, power-off adjustment coefficient, and constant current adjustment coefficient are all greater than 0 and less than 1. Potential compliance means the potential value is within the compliant potential range; potential non-compliance means the potential value is outside the compliant potential range; under-protection means the potential value is greater than the compliant potential range; over-protection means the potential value is less than the compliant potential range. To make the variation coefficient more reliable, m is greater than or equal to 3.

[0083] In some embodiments, after performing the data acquisition step, a compliance comparison step is further included.

[0084] After the data acquisition step is completed, a compliance comparison step is performed, and the detection points A1 to A2 are compared.m The collected power-off potentials are compared with the compliant potential range. If the power-off potentials of all detection points are within the compliant potential range, the potentials are compliant, and each potentiostat maintains its current operation. If the power-off potential of any detection point is outside the compliant potential range, the potentials are not compliant, and the data analysis step is performed.

[0085] Detection points A1~A m If all the de-energized potentials meet the standards, it indicates that the pipeline is currently in optimal cathodic protection condition. No adjustments to the potentiostats are needed, and no further steps are required. This avoids unnecessary output adjustments to the potentiostats that could alter the pipeline's potential and affect the cathodic protection effect. Furthermore, once it is confirmed that all de-energized potentials at the detection points meet the standards, the workflow can more quickly return to the data acquisition cycle, shortening the cycle time and allowing for earlier detection of substandard de-energized potentials at the detection points, thus improving the sensitivity of the potentiostat adjustments.

[0086] In some embodiments, the data analysis step further includes calculating the potentiostat C1 to C2. n The second interference coefficient X is the ratio of the number of Class A test points whose power outage potential exceeds the second analysis threshold for n consecutive operating cycles within m operating cycles to the total number of Class A test points, where n < m. This ratio reflects the degree of UHVDC interference on the test points with higher influence corresponding to the current potentiostat. Here, n is a non-zero natural number; to make the coefficient of variation more reliable, m should be at least 4 and n at least 3.

[0087] Due to the introduction of the magnitude of UHVDC interference, in the adjustment mode analysis step, the first interference coefficient Y less than or equal to the first interference threshold is replaced with the first interference coefficient Y less than or equal to the first interference threshold and the second interference coefficient X less than or equal to the second interference threshold, and the first interference coefficient Y greater than the first interference threshold is replaced with the first interference coefficient Y greater than the first interference threshold or the second interference coefficient X greater than the second interference threshold.

[0088] In the adjustment mode analysis steps, when both the dynamic stray current interference and the UHVDC interference are relatively small, conventional constant current adjustment, conventional constant current interruption adjustment, and conventional constant current adjustment are used. The de-energization potential of all non-compliant Class A test points is used as the adjustment basis for the potentiostat, enabling the pipeline to achieve the optimal cathodic protection state after potentiostat adjustment. When either the dynamic stray current interference or the UHVDC interference is relatively large, interference constant current adjustment, interference constant current interruption adjustment, and interference constant current adjustment are used. When the interference is large, the difference between the non-compliant Class A test points and the compliant potential range is selectively used as the adjustment basis, enabling the pipeline to achieve the optimal cathodic protection state after potentiostat adjustment. The introduction of UHVDC interference further improves the rationality of the adjustment basis and enhances the effect after adjustment.

[0089] In some embodiments, in the influence setting step, ΔV text Test points whose absolute value is less than the first influence threshold and greater than or equal to the second influence threshold are set as Class B test points, where the first influence threshold is greater than the second influence threshold.

[0090] The introduction of the second influence threshold further subdivides the test points, designating test points with a high degree of influence from the operation of the potentiostat as Class A test points, while designating test points with a moderate degree of influence from the operation of the potentiostat as Class B test points.

[0091] The conventional constant current adjustment procedure is replaced as follows: If the de-energized potentials of the Class A and Class B test points of the potentiostat are substandard, calculate the first conventional current-energized potential difference between the de-energized potential of the substandard Class A test point and the closest compliant potential, and calculate the second conventional current-energized potential difference between the de-energized potential of the substandard Class B test point and the closest compliant potential. Multiply the first and second conventional current-energized potential differences by the first and second current-energized adjustment coefficients, respectively, to obtain two sets of conventional current-energized simulated adjustment values. The conventional current-energized simulated adjustment value with the smallest absolute value is taken as the conventional current-energized potential adjustment value. The potentiostat adjusts its preset current-energized potential according to the conventional current-energized potential adjustment value.

[0092] The conventional constant power-off adjustment procedure is replaced as follows: If the power-off potential of the Class A test points and Class B test points of the potentiostat is not up to standard, calculate the first conventional power-off potential difference between the power-off potential of the substandard Class A test point and the closest compliant potential, and calculate the second conventional power-off potential difference between the power-off potential of the substandard Class B test point and the closest compliant potential. Multiply the first conventional power-off potential difference and the second conventional power-off potential difference by the first power-off adjustment coefficient and the second power-off adjustment coefficient, respectively, to obtain two sets of conventional power-off simulation adjustment amounts. The conventional power-off simulation adjustment amount with the smallest absolute value is taken as the conventional power-off potential adjustment amount, and the potentiostat adjusts its preset power-off potential according to the conventional power-off simulation adjustment amount.

[0093] The conventional constant current adjustment procedure is replaced as follows: If the de-energization potential of the potentiostat's Class A and Class B test points is substandard, the rated output current of the potentiostat is multiplied by the constant current adjustment coefficient corresponding to the substandard test point type to obtain the conventional current analog quantity. That is, the constant current adjustment coefficient is divided into a first constant current adjustment coefficient and a second constant current adjustment coefficient. When the substandard test point is only Class A, the rated output current of the potentiostat is multiplied by the first constant current adjustment coefficient to obtain the conventional current analog quantity; when the substandard test point is only Class B, the rated output current of the potentiostat is multiplied by the second constant current adjustment coefficient to obtain the conventional current analog quantity; when the substandard test points are both Class A and Class B, the rated output current of the potentiostat is multiplied by both the first and second constant current adjustment coefficients to obtain two conventional current analog quantities. The conventional current analog quantity with the smallest absolute value is used as the conventional current adjustment quantity, and the potentiostat adjusts its output current according to the conventional current adjustment quantity.

[0094] With the introduction of Class B test points, the adjustment basis of the potentiostat in conventional constant current adjustment, conventional constant current-off adjustment, and conventional constant current adjustment is further refined. The calculation of the adjustment amount not only takes the substandard Class A test points as the calculation basis, but also the substandard Class B test points. That is, the adjustment of the potentiostat not only considers the Class A test points with greater influence, but also the Class B test points with moderate influence. After the potentiostat adjusts its output according to the adjustment amount, the de-energization potential of both Class A and Class B test points can approach or enter the compliant potential range, so that the pipeline can reach the optimal cathodic protection state after multiple rounds of adjustment.

[0095] In some embodiments, the first power-on adjustment coefficient is greater than the second power-on adjustment coefficient, and the first power-off adjustment coefficient is greater than the second power-off adjustment coefficient. The constant current adjustment coefficient corresponding to the type A test point is greater than the constant current adjustment coefficient corresponding to the type B test point, that is, the first constant current adjustment coefficient is greater than the second constant current adjustment coefficient.

[0096] The relationship between the aforementioned adjustment coefficients allows for a relatively larger adjustment step size for Class A test points and a relatively smaller adjustment step size for Class B test points. This results in a smaller adjustment amount, leading to a smaller adjustment step size for the potentiostat. Furthermore, the adjustment ensures that the de-energized potentials of both Class A and Class B test points approach or enter the compliant potential range, enabling the pipeline to achieve optimal cathodic protection after multiple adjustments. The first energized adjustment coefficient can be set to 0.1, and the second energized adjustment coefficient can be set to 0.01. The first de-energized adjustment coefficient can be set to 0.1, and the second de-energized adjustment coefficient can be set to 0.001. The first constant current adjustment coefficient can be set to 0.1, and the second constant current adjustment coefficient can be set to 0.001.

[0097] In some embodiments, an AC interference analysis step is further included prior to the initial step.

[0098] If the de-energization potentials of all Class A test points of the potentiostat meet the standards, and there is an AC current density greater than the AC threshold in the Class A test points, then an AC interference adjustment step is performed, and the Class A test points with AC current density greater than the AC threshold are set as Class P test points.

[0099] When adjusting for AC interference, the potentiostat operates according to the current operating mode. If the DC current density at the P-type test point is less than or equal to the DC threshold, the potentiostat maintains its current operating state. If the DC current density at the P-type test point is greater than the DC threshold, the compliant potential range used in subsequent steps is -0.9V to -1.15V.

[0100] The AC interference analysis step introduces the degree of DC interference. If the AC current density at Class A test points exceeds the AC threshold, it indicates strong AC interference at those points. The pipeline potential will change due to this interference. If subsequent steps directly use the conventional acceptable potential range of -0.85V to -1.2V as the adjustment basis, the pipeline potential after potentiostat adjustment may be at risk of AC interference corrosion. Therefore, an AC interference adjustment step is required. In the AC interference adjustment step, if the DC current density at all Class P test points is less than or equal to the DC threshold, it indicates a low risk of AC corrosion at these test points. In this case, the AC interference is considered acceptable, and the AC interference adjustment is completed, proceeding to the subsequent adjustment mode analysis. If the DC current density at Class P test points exceeds the DC threshold, it indicates a risk of AC interference corrosion at these test points. In this case, the AC interference is considered unacceptable, and the acceptable potential range is set to -0.9V to -1.15V, proceeding to the subsequent adjustment mode analysis step.

[0101] The acceptable potential range is set to -0.9V to -1.15V. This means that in subsequent adjustments for routine constant current, routine constant current interruption, routine constant current, interference constant current, interference constant current interruption, and interference constant current, the judgment of whether the potential meets the standard will be based on this range. The potential difference between the unacceptable potential and the acceptable potential range during adjustment calculations will also be within this range. When both AC and DC interference are significant, using a range of -0.9V to -1.15V ensures more accurate subsequent potential compliance judgments and potentiostat adjustments, adapting to the impact of AC interference on pipeline potential and ensuring the pipeline is truly in optimal cathodic protection condition.

[0102] The DC and AC thresholds are set manually, with the AC threshold set to 30A / m. 2 The DC threshold can be set to 1A / m. 2 .

[0103] In some embodiments, in the influence setting step, ΔV text Test points whose absolute value is less than the first influence threshold and greater than or equal to the second influence threshold are set as Class B test points, where the first influence threshold is greater than the second influence threshold.

[0104] The AC interference analysis steps are replaced as follows: If the de-energization potentials of both Class A and Class B test points of the potentiostat meet the standards, and there is an AC current density greater than the AC threshold in Class A and Class B test points, then an AC interference adjustment step is performed, and the Class A and Class B test points with AC current densities greater than the AC threshold are set as Class P test points.

[0105] The introduction of Class B test points makes the AC interference analysis more detailed. Class A and Class B test points are set as Class P test points according to the degree of AC interference they are affected by, making the reference basis for whether the subsequent standard potential range needs to be adjusted more accurate. This further improves the accuracy of whether the potential meets the standard and the calculation of the standard gap when the potentiostat is adjusted, adapts to the impact of AC interference on the pipeline potential, and ensures that the pipeline is truly in the best cathodic protection state.

[0106] Finally, it should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0107] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A method for intelligent control of line cathodic protection, characterized in that, Includes the following steps: Natural potential acquisition: Data is collected from monitoring points A1 to A2 along the pipeline. m The natural potential; Impact testing: Potentiostatic meters C1~C along the pipeline n The test runs are performed sequentially according to the set output current, with only one potentiostat running at a time. Data is collected at detection points A1 to A2 during the test run of each potentiostat. m The power-off potential is determined, and the test potential difference ΔV between it and the corresponding natural potential is calculated. text ; Influence setting: Extract all test potential differences ΔV corresponding to a potentiostat. text , will ΔV text Test points whose absolute value is greater than or equal to the first influence threshold are set as Class A test points, and the other potentiostats obtain their corresponding Class A test points in the same way as described above. System operation: Potentiostat C1~C n All will run according to the corresponding set operating mode until the set initial operating parameters are reached; Operational data acquisition: Data collection from monitoring points A1 to A2 along the pipeline. m The power-off potential, and the test stakes B1 to B1 corresponding to each potentiostat. n The on-state potential and the off-state potential; Data analysis: Data acquisition using potentiostat C1~C n The operating mode of the potentiostat is calculated, and C1~C2 are calculated. n Calculate the potentiostat C1~C2 based on the first coefficient of variation CV1 and the second coefficient of variation CV2. n Calculate the third coefficient of variation CV3 for the corresponding Class A test points, and calculate the potentiostat C1~C n The first interference coefficient Y; where the first coefficient of variation CV1 is the ratio of the standard deviation to the average value of the energized potential measured by the potentiostat at its corresponding test pile within m operating cycles, the second coefficient of variation CV2 is the ratio of the standard deviation to the average value of the de-energized potential measured by the potentiostat at its corresponding test pile within m operating cycles, the third coefficient of variation CV3 is the ratio of the standard deviation to the average value of the de-energized potential measured by the Class A test point within m operating cycles, and the first interference coefficient Y is the ratio of the Class A test points whose third coefficient of variation CV3 exceeds the first analysis threshold to the total number of Class A test points; System adjustment: Adjust the potentiostat C1 to C2 sequentially. n Perform regulation mode analysis; Regulation mode analysis: If the potentiostat operates in constant current potential mode and the first interference coefficient Y is less than or equal to the first interference threshold, then the regular constant current adjustment procedure is performed. If the potentiostat operates in constant current mode, the first coefficient of variation CV1 is less than or equal to the first variation threshold, the second coefficient of variation CV2 is greater than the second variation threshold, and the first interference coefficient Y is less than or equal to the first interference threshold, then the potentiostat switches to constant current potential mode and performs the routine constant current adjustment steps. If the potentiostat operates in constant current potential mode and the first interference coefficient Y is greater than the first interference threshold, then the interference constant current adjustment step is performed. If the potentiostat operates in constant current mode, the first coefficient of variation CV1 is less than or equal to the first variation threshold, the second coefficient of variation CV2 is greater than the second variation threshold, and the first interference coefficient Y is greater than the first interference threshold, then the potentiostat switches to constant current potential mode and performs interference constant current adjustment steps. If the potentiostat operates in constant power-off potential mode, and the first interference coefficient Y is less than or equal to the first interference threshold, then the regular constant power-off adjustment procedure is performed. If the potentiostat operates in constant current mode, the second coefficient of variation CV2 is less than or equal to the second variation threshold, and the first interference coefficient Y is less than or equal to the first interference threshold, then the potentiostat switches to constant power-off potential mode and performs the routine constant power-off adjustment steps. If the potentiostat operates in constant off-voltage mode and the first interference coefficient Y is greater than the first interference threshold, then the interference constant off-voltage adjustment step is performed. If the potentiostat operates in constant current mode, the second coefficient of variation CV2 is less than or equal to the second variation threshold, and the first interference coefficient Y is greater than the first interference threshold, then the potentiostat switches to constant off-potential mode and performs interference constant off-potential adjustment steps. If the potentiostat is in constant current mode, the first coefficient of variation CV1 is greater than the first variation threshold, the second coefficient of variation CV2 is greater than the second variation threshold, and the first interference coefficient Y is less than or equal to the first interference threshold, then the conventional constant current adjustment steps are performed. If the potentiostat operates in constant current mode, and the first coefficient of variation CV1 is greater than the first variation threshold, the second coefficient of variation CV2 is greater than the second variation threshold, and the first interference coefficient Y is greater than the first interference threshold, then the interference constant current adjustment step is performed. Routine constant current adjustment: If the de-energized potential of the Class A test point of the potentiostat is not up to standard, calculate the routine current potential difference between the de-energized potential of the Class A test point that is not up to standard and the closest compliant potential. Multiply the routine current potential difference by the current adjustment coefficient to obtain the routine current simulated adjustment amount. The routine current simulated adjustment amount with the smallest absolute value is taken as the routine current potential adjustment amount. The potentiostat adjusts its preset current potential according to the routine current potential adjustment amount. Interference Constant Current Adjustment: If the power-off potential of the Class A test point of the potentiostat is under-protected, the first interference current potential difference between the power-off potential of the under-protected Class A test point and the closest compliant potential is calculated. The first interference current potential difference is multiplied by the current adjustment coefficient to obtain the first interference current simulated adjustment amount. The first interference current simulated adjustment amount with the smallest absolute value is taken as the first interference current potential adjustment amount. The potentiostat adjusts its preset current potential according to the first interference current potential adjustment amount. If the power-off potential of the Class A test point of the potentiostat is not under-protected but is over-protected, the second interference current potential difference between the power-off potential of the over-protected Class A test point and the closest compliant potential is calculated. The second interference current potential difference is multiplied by the current adjustment coefficient to obtain the second interference current simulated adjustment amount. The second interference current simulated adjustment amount with the smallest absolute value is taken as the second interference current potential adjustment amount. The potentiostat adjusts its preset current potential according to the second interference current potential adjustment amount. Routine power-off adjustment: If the power-off potential of the Class A test point of the potentiostat is not up to standard, calculate the routine power-off potential difference between the power-off potential of the substandard Class A test point and the closest compliant potential. Multiply the routine power-off potential difference by the power-off adjustment coefficient to obtain the routine power-off simulation adjustment amount. The routine power-off simulation adjustment amount with the smallest absolute value is taken as the routine power-off potential adjustment amount. The potentiostat adjusts its preset power-off potential according to the routine power-off simulation adjustment amount. Interference Power-Off Adjustment: If the power-off potential of the Class A test point of the potentiostat is underprotected, the first interference power-off potential difference between the underprotected Class A test point and the closest compliant potential is calculated. The first interference power-off potential difference is multiplied by the power-off adjustment coefficient to obtain the first interference power-off simulated adjustment amount. The first interference power-off simulated adjustment amount with the smallest absolute value is taken as the first interference power-off potential adjustment amount. The potentiostat adjusts its preset power-off potential according to the first interference power-off potential adjustment amount. If the power-off potential of the Class A test point of the potentiostat is not underprotected but is overprotected, the second interference power-off potential difference between the overprotected Class A test point and the closest compliant potential is calculated. The second interference power-off potential difference is multiplied by the power-off adjustment coefficient to obtain the second interference power-off simulated adjustment amount. The second interference power-off simulated adjustment amount with the smallest absolute value is taken as the second interference power-off potential adjustment amount. The potentiostat adjusts its preset power-off potential according to the second interference power-off potential adjustment amount. Routine constant current adjustment: If the de-energization potential of the Class A test point of the potentiostat is not up to standard, the rated output current of the potentiostat is multiplied by the constant current adjustment coefficient to obtain the routine current adjustment amount, and the potentiostat adjusts its output current according to the routine current adjustment amount. Interference constant current adjustment: If the de-energization potential of the Class A test point of the potentiostat is not up to standard, the rated output current of the potentiostat is multiplied by the constant current adjustment coefficient to obtain the conventional current adjustment amount, and the potentiostat adjusts its output current according to the conventional current adjustment amount.

2. The intelligent control method for line cathodic protection according to claim 1, characterized in that, Following the data collection step, a compliance comparison step is further included; Comparison of standards: Test points A1 to A m The collected power-off potentials are compared with the compliant potential range. If the power-off potentials of all detection points are within the compliant potential range, the potentials are compliant, and each potentiostat maintains its current operation. If the power-off potential of any detection point is outside the compliant potential range, the potentials are not compliant, and the data analysis step is performed.

3. The intelligent control method for line cathodic protection according to claim 1, characterized in that, The data analysis step further includes calculating the potentiostat C1 to C2. n The second interference coefficient X; where the second interference coefficient X is the ratio of the number of Class A test points whose power failure potential exceeds the second analysis threshold for n consecutive operating cycles within m operating cycles to the total number of Class A test points, n < m; In the adjustment mode analysis step, the first interference coefficient Y being less than or equal to the first interference threshold is replaced with the first interference coefficient Y being less than or equal to the first interference threshold and the second interference coefficient X being less than or equal to the second interference threshold; the first interference coefficient Y being greater than the first interference threshold is replaced with the first interference coefficient Y being greater than the first interference threshold or the second interference coefficient X being greater than the second interference threshold.

4. The intelligent control method for line cathodic protection according to claim 1, characterized in that, In the influence setting steps, ΔV text Test points whose absolute value is less than the first influence threshold and greater than or equal to the second influence threshold are set as Class B test points, where the first influence threshold is greater than the second influence threshold. The conventional constant current adjustment procedure is replaced as follows: If the de-energized potential of the Class A and Class B test points of the potentiostat is not up to standard, calculate the first conventional current-on potential difference and the second conventional current-on potential difference between the de-energized potential of the Class A and Class B test points that are not up to standard and the closest compliant potential. Multiply the first conventional current-on potential difference and the second conventional current-on potential difference by the first current-on adjustment coefficient and the second current-on adjustment coefficient respectively to obtain the conventional current-on simulated adjustment amount. The conventional current-on simulated adjustment amount with the smallest absolute value is taken as the conventional current-on potential adjustment amount. The potentiostat adjusts its preset current-on potential according to the conventional current-on potential adjustment amount. The conventional constant power-off adjustment procedure is replaced as follows: If the power-off potential of the Class A and Class B test points of the potentiostat is not up to standard, calculate the first conventional power-off potential difference and the second conventional power-off potential difference between the power-off potential of the non-compliant Class A and Class B test points and the closest compliant potential. Multiply the first conventional power-off potential difference and the second conventional power-off potential difference by the first power-off adjustment coefficient and the second power-off adjustment coefficient respectively to obtain the conventional power-off simulation adjustment amount. Take the conventional power-off simulation adjustment amount with the smallest absolute value as the conventional power-off potential adjustment amount. The potentiostat adjusts its preset power-off potential according to the conventional power-off simulation adjustment amount. The conventional constant current adjustment procedure is replaced as follows: If the de-energization potential of the Class A and Class B test points of the potentiostat is not up to standard, the rated output current of the potentiostat is multiplied by the constant current adjustment coefficient corresponding to the type of test point that is not up to standard to obtain the conventional current analog quantity. The conventional current analog quantity with the smallest absolute value is taken as the conventional current adjustment quantity, and the potentiostat adjusts its output current according to the conventional current adjustment quantity.

5. The intelligent control method for line cathodic protection according to claim 4, characterized in that, The first power-on adjustment coefficient is greater than the second power-on adjustment coefficient, the first power-off adjustment coefficient is greater than the second power-off adjustment coefficient, and the constant current adjustment coefficient corresponding to the type A test point is greater than the constant current adjustment coefficient corresponding to the type B test point.

6. The intelligent control method for line cathodic protection according to claim 1, characterized in that, Prior to the regulation mode analysis, an AC interference analysis step is further included; AC interference analysis: If the de-energization potential of the Class A test points of the potentiostat meets the standard, and there is an AC current density in the Class A test points that is greater than the AC threshold, then perform the AC interference adjustment step and set the Class A test points with AC current density greater than the AC threshold as Class P test points. AC interference adjustment: The potentiostat operates according to the current operating mode. If the DC current density of the P-type test point is less than or equal to the DC threshold, the potentiostat maintains the current operating state; if the DC current density of the P-type test point is greater than the DC threshold, the compliant potential range used in subsequent steps is -0.9V to -1.15V.

7. The intelligent control method for line cathodic protection according to claim 5, characterized in that, In the influence setting steps, ΔV text Test points whose absolute value is less than the first influence threshold and greater than or equal to the second influence threshold are set as Class B test points, where the first influence threshold is greater than the second influence threshold. The AC interference analysis steps are replaced as follows: If the de-energization potentials of both Class A and Class B test points of the potentiostat meet the standards, and there is an AC current density greater than the AC threshold in Class A and Class B test points, then an AC interference adjustment step is performed, and the Class A and Class B test points with AC current densities greater than the AC threshold are set as Class P test points.

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