CN100567575C - Active interference removing apparatus for buried pipeline - Google Patents

Abstract

The invention relates to an active anti-interference device for buried pipelines, which includes a DC power supply unit, a pipeline-ground potential sensor, a given potentiometer, a voltage control unit and a power output unit. The voltage control unit is used to generate a PWM pulse width modulation signal, and the power The output unit is used to control the output of its internal inverter according to the PWM pulse width modulation signal, and output the anti-interference voltage which has been filtered and is equal to and opposite to the interference of the pipeline to the auxiliary ground bed and buried pipeline. The present invention adopts the tracking type PWM control method, so that its output can follow the change of the reference command signal of the command voltage processing module in time, and has the advantages of high output sensitivity, fast response speed, good dynamic performance, etc., and is especially suitable for eliminating and disturbances caused by changes in space weather.

Description

Buried pipeline active anti-jamming device

technical field

The invention relates to the field of electrochemical corrosion of buried metal pipelines, in particular to an active anti-interference device for buried pipelines.

Background technique

The continuous growth of the economy makes the demand for energy more and more large, and the construction of power transmission lines and oil pipelines is developing rapidly. Affected by factors such as population density, land resource conditions, and similar selection principles for transmission routes in the power industry and petrochemical industry, high-voltage transmission lines and buried pipelines are often arranged in parallel or across long distances. When the high-voltage transmission line is parallel to or crosses the buried pipeline, due to the influence of the alternating electromagnetic field generated by the high-voltage transmission line, the buried pipeline made of metal will induce AC voltage and current.

Even in areas without human interference, buried pipelines will have changing pipeline-ground potentials and pipeline currents, and the changes in pipeline-ground potentials are usually related to the disturbance of the geomagnetic field. When there are physical phenomena such as large sunspot groups, coronal holes, strong flares, and violent mass ejections on the sun, a large number of charged particle flows and high-energy rays enter the sun-earth space, especially the near-Earth space, resulting in a violent terrestrial magnetic field Changing, changing magnetic fields will also generate alternating induced voltages and currents on buried pipelines.

The interference caused by factors such as high-voltage transmission lines and changes in the earth's magnetic field on buried pipelines is called AC interference. The pipeline-ground potential of buried pipelines subject to AC interference is constantly changing. When the pipeline-ground potential is higher than its protection potential (- 0.85V), the pipeline will generate a leakage current to the ground, which will cause AC corrosion to the pipeline. When the pipeline ground potential is too low (less than -1.2V), it will cause damage to the pipeline coating and cause hydrogen evolution damage to sensitive steel.

At present, the existing technology generally adopts the drainage method and the cathodic protection device to eliminate the AC interference.

In the drainage method, the clamping drainage method and the method of sacrificial anode plus polarity drainage are more widely used. The clamping drainage method connects the pipeline to the earth through the drainage joint for direct drainage. It consists of two arms, one of which is connected in series with a silicon diode, and its anode is connected to the pipeline, which is called the positive arm; the other arm is connected in series with two silicon diodes, and its negative pole is connected to the pipeline, which is called the negative arm. When there is an interference voltage on the pipeline, the positive arm is turned on when the voltage is in the positive half cycle, and the negative arm is turned on when the voltage is in the negative half cycle. The actual use shows that although the clamp type drainer can alleviate the harm caused by AC interference to the pipeline to a certain extent, it still cannot completely solve the corrosion problem of the pipeline. Since the forward voltage drop of the silicon diode is 0.7V, when the positive arm of the discharge junction is turned on, the remaining voltage on the pipe will be greater than 0.7V, which is greater than the protection potential of the pipe (-0.85V) , the pipeline will inevitably suffer from corrosion in this case. The sacrificial anode plus polarity drainage method can provide a normal cathodic protection potential for the pipeline when the pipeline-ground potential rises, but it can only eliminate the AC interference of the pipeline in one direction, and cannot eliminate the damage caused by the low pipeline-ground potential to the pipeline.

The cathodic protection device relies on its internal potentiostat to provide protection voltage to the buried pipeline, so as to polarize the pipeline cathodically and prevent pipeline corrosion. The characteristics of the potentiostat are: the feedback signal is the measured tube-to-ground potential value, and the output of the potentiostat is controlled and adjusted by comparing the feedback tube-to-ground potential with a given potential. When the tube-to-ground potential rises, increase the output voltage to reduce the tube-to-ground potential. When the tube-to-ground potential drops, reduce the output voltage, but the output voltage can only drop to zero. If the tube-to-ground potential continues to drop, the potentiostat cannot start To the protective effect, so the cathodic protection device can not completely eliminate AC interference. In addition, in order to stabilize the output voltage and reduce the ripple coefficient, the existing cathodic protection device uses a large inductance or large capacitance filter circuit, which will cause the output voltage of the cathodic protection device to lag behind the input control signal. When there is AC interference, Because the delay time is too long, it is difficult to eliminate the interference in time through control, and sometimes more serious unstable oscillations are caused by the mismatch between the control time and the interference time.

To sum up, although the prior art proposes some technical solutions for eliminating the alternating interference of buried pipelines, none of them can completely eliminate the alternating interference fundamentally.

Contents of the invention

The object of the present invention is to provide an active interference removal device for buried pipelines, which can not only completely eliminate the alternating interference on buried pipelines, but also has fast response speed and good dynamic performance.

In order to achieve the above object, the present invention provides an active anti-interference device for buried pipelines, including a DC power supply unit for providing DC power, a pipeline-ground potential sensor for detecting the pipeline-ground potential of buried pipelines, and a pipeline-ground potential sensor for providing The given potentiometer for the given potential also includes a voltage control unit and a power output unit, the voltage control unit is connected with the pipe-ground potential sensor and the given potentiometer, and is used to receive the pipe-ground potential sent by the pipe-ground potential sensor and the given potential sent by the given potentiometer, according to the comparison result of the pipe-ground potential and the given potential, a reference command signal reflecting the ideal interference removal voltage is generated; at the same time, the voltage control unit is also connected with the output of the power output unit terminal connection, used to monitor the actual interference removal voltage output by the power output unit, and generate a PWM pulse width modulation signal according to the deviation between the actual interference removal voltage and the ideal interference removal voltage; the power output unit includes an inverter and a filter circuit, so The input end of the inverter is connected to the DC power supply unit, and the control end of the inverter is connected to the voltage control unit for receiving the PWM pulse width modulation signal sent by the voltage control unit, and according to the PWM pulse width modulation signal, to invert the DC power output by the DC power supply unit into a bipolar voltage, so that the output of the inverter follows the change of the reference command signal; the input end of the filter circuit is connected to the output end of the inverter, and the filter circuit The output terminals of the inverter are respectively connected to the auxiliary ground bed and the buried pipeline, and are used to filter the bipolar voltage output by the inverter to form an actual interference-removing voltage equal in size and opposite to the pipeline interference to the auxiliary ground bed and buried pipeline. ground pipe output.

The voltage control unit includes:

The signal processing module is connected with the pipe-ground potential sensor, and is used to receive and process the pipe-ground potential sent by the pipe-ground potential sensor;

The command voltage processing module is connected with the signal processing module and the given potentiometer respectively, and is used to receive the pipe-ground potential sent by the signal processing module and the given potential sent by the given potentiometer, and according to the comparison between the pipe-ground potential and the given potential As a result, a reference command signal is generated;

The voltage tracking control module is connected to the command voltage processing module and the output terminal of the power output unit respectively, and is used to receive the reference command signal reflecting the ideal interference removal voltage from the command voltage processing module, and receive the actual interference removal from the output terminal of the power output unit Voltage, according to the deviation between the actual interference removal voltage and the ideal interference removal voltage, a PWM pulse width modulation signal is generated;

The driving circuit is respectively connected with the voltage tracking control module and the inverter of the power output unit, and controls the inverter to output an actual interference-removing voltage that is equal in magnitude and opposite in direction to the pipeline interference according to the PWM pulse width modulation signal.

On the basis of the above technical solution, when the buried pipeline approaches the high-voltage transmission line in parallel, the output end of the power output unit is connected to the terminal position of the buried pipeline. When the buried pipeline crosses the high-voltage transmission line, the output end of the power output unit is connected to the intersection of the buried pipeline and the high-voltage transmission line. When the buried pipeline is equipped with insulating flanges, the output ends of the power output unit are connected to both sides of the buried pipeline insulating flanges to prevent electromagnetic interference caused by space weather.

On the basis of the above technical solutions, it also includes cathodic protection devices arranged at the terminal position of the buried pipeline parallel to the high-voltage transmission line, the intersection position between the buried pipeline and the high-voltage transmission line, or the two sides of the insulating flange of the buried pipeline, The output end of the power output unit is connected in series with the cathodic protection device to jointly protect the buried pipeline.

The present invention proposes an active anti-jamming device for buried pipelines. Since the bipolar voltage output by the inverter is controllable in size and direction, the pipeline-ground potential opposite to the interference direction of the pipeline is "injected" into the buried pipeline, so It can completely eliminate any interference generated on the pipeline; due to the combined structure of the inverter and the voltage tracking control module, the output can follow the change of the reference command signal of the command voltage processing module in time by adopting the tracking PWM control method, so It has the advantages of high output sensitivity, fast response, and good dynamic performance, and is especially suitable for eliminating interference caused by high-voltage power lines and space weather changes. Furthermore, the present invention also summarizes the characteristics and laws of various interferences on the pipeline, and proposes the optimal configuration principles of the buried pipeline active interference removal device of the present invention, respectively: if the buried pipeline and the high-voltage transmission line Approaching in parallel, the present invention is arranged at the two ends of the pipeline in this section; if the buried pipeline and the high-voltage transmission line are intersected and distributed, the present invention is arranged at the intersection; for pipelines equipped with insulating flanges, in order to prevent the electromagnetic interference, the present invention is configured on both sides of the insulating flange. Through the configuration principle of the present invention, the buried pipeline active de-interference device of the present invention can be reasonably configured according to the interference situation of the AC transmission line and the distribution of the pipeline-ground potential generated on the buried pipeline according to the geomagnetic interference of space weather, so as to realize the best Effect. Furthermore, the active anti-jamming device for buried pipelines of the present invention can also be used in conjunction with cathodic protection devices for pipelines, and has broad application prospects.

The technical solutions of the present invention will be described in further detail below with reference to the accompanying drawings and embodiments.

Description of drawings

Fig. 1 is the structural representation of the buried pipeline active anti-jamming device of the present invention;

Fig. 2 is a schematic structural view of an embodiment of an active anti-jamming device for buried pipelines of the present invention;

Fig. 3 is a schematic diagram of the distribution of the interference voltage generated on the pipeline along the pipeline at a certain moment when the high-voltage transmission line and the buried pipeline are distributed in parallel;

Fig. 4 is a schematic diagram of the distribution of the interference voltage generated on the pipeline along the pipeline at a certain moment when the high-voltage transmission line and the buried pipeline are cross-distributed;

Figure 5 is a schematic diagram of the distribution of the interference voltage along the pipeline at a certain moment when the earth's magnetic field changes caused by space weather;

Fig. 6 is a schematic diagram showing the distribution of interference-removing voltages generated by the active device for removing interference for buried pipelines according to the present invention.

Explanation of reference signs:

1-DC power supply unit; 2-Power output unit; 3-Voltage control unit;

4-Auxiliary ground bed; 5-Buried pipeline; 6-Pipe ground potential sensor;

7-given potentiometer; 8-reference electrode; 21-inverter;

22-Filter circuit; 31-Signal processing module; 32-Command voltage processing module;

33-voltage tracking control module; 34-drive circuit; 100-high voltage transmission line.

Detailed ways

Fig. 1 is a structural schematic diagram of an active anti-jamming device for a buried pipeline according to the present invention. As shown in Figure 1, the buried pipeline active interference removal device of the present invention includes a DC power supply unit 1, a power output unit 2, a voltage control unit 3, a pipeline-ground potential sensor 6, a given potentiometer 7 and a reference electrode 8, wherein The pipe-ground potential sensor 6 is connected with the reference electrode 8 for detecting the pipe-ground potential of the buried pipeline 5; the given potentiometer 7 is used to provide a given potential; the voltage control unit 3 is connected with the pipe-ground potential sensor 6 and the given potential Connected to the device 7, used to receive the pipe-ground potential sent by the pipe-ground potential sensor 6 and the given potential sent by the given potentiometer 7, and generate a reference command reflecting the ideal interference-removing voltage according to the comparison result between the pipe-ground potential and the given potential signal; at the same time, the voltage control unit 3 is also connected to the output terminal of the power output unit 2 for monitoring the actual interference removal voltage output by the power output unit 2, and generates a PWM pulse according to the comparison result between the actual interference removal voltage and the ideal interference removal voltage wide modulation signal. The control terminal of the power output unit 2 is connected to the voltage control unit 3, its input terminal is connected to the DC power supply unit 1, and its output terminal is respectively connected to the auxiliary ground bed 4 and the buried pipeline 5 for receiving the PWM signal sent by the voltage control unit 3. Pulse width modulation signal, control the output of the inverter according to the PWM pulse width modulation signal, and output the filtered interference-removing voltage to the auxiliary ground bed 4 and buried pipeline 5. The interference-removing voltage is equal in size and direction to the pipeline interference On the contrary, to offset the change of pipe-ground potential generated by AC interference on buried pipelines, the ideal waveform of pipe-ground potential is obtained.

Fig. 2 is a schematic structural view of an embodiment of an active interference removal device for a buried pipeline according to the present invention. As shown in Figure 2, in the above technical solution of this embodiment, the power output unit 2 includes an inverter 21 and a filter circuit 22, the input end of the inverter 21 is connected to the DC power supply unit 1, and the output end is connected to the filter circuit 22, The control terminal is connected to the voltage control unit 3, and is used to invert the DC output from the DC power supply unit 1 into a bipolar voltage according to the PWM pulse width modulation signal sent by the voltage control unit 3, so that the output follows the PWM pulse width modulation signal. change; the input end of the filter circuit 22 is connected to the inverter 21, and the output end is respectively connected to the auxiliary ground bed 4 and the buried pipeline 5, and is used to filter the bipolar voltage output by the inverter 21 to form a connection with the pipeline The anti-interference voltage with equal interference and opposite direction is output to auxiliary ground bed 4 and buried pipeline 5 . The voltage control unit 3 includes a signal processing module 31, a command voltage processing module 32, a voltage tracking control module 33, and a drive circuit 34. The signal processing module 31 is connected to the pipe-ground potential sensor 6 for receiving the pipe-ground potential sensor 6. The potential is processed as the input signal of the command voltage processing module 32. In this embodiment, the pipe-ground potential sensor 6 is also connected with the reference electrode 8; the command voltage processing module 32 is connected with the signal processing module 31 and the given potentiometer 7 respectively , used to receive the pipe-to-ground potential sent by the signal processing module 31 and the given potential sent by the given potentiometer 7, and generate a reference command signal according to the comparison result of the pipe-to-ground potential and the given potential, and the ideal target reflected by the reference command signal The interference voltage is exactly the anti-interference voltage that expects the power output unit 2 to output the AC interference that can eliminate the buried pipeline in time; The voltage processing module 32 receives the reference command signal reflecting the ideal interference removal voltage, receives the actual interference removal voltage from the output terminal of the power output unit 2, and generates a PWM pulse width modulation signal according to the deviation between the actual interference removal voltage and the ideal interference removal voltage; One end of the drive circuit 34 is connected to the voltage tracking control module 33, and the other end is connected to the inverter 21 of the power output unit 2, and the inverter 21 is controlled according to the PWM pulse width modulation signal to adjust the output voltage of the power output unit 2 to remove interference. The size and direction, that is, "injecting" the pipe-ground potential opposite to the pipeline interference direction into the buried pipeline, so that the present invention can timely and accurately offset the change of the pipeline-ground potential generated by the AC interference on the buried pipeline, and obtain an ideal pipe-ground potential waveform.

In the above-mentioned technical solution of the present invention, the DC power supply unit can be a DC power supply obtained by rectifying and filtering 380V AC power. When there is no AC power supply in actual use, it can also be a DC power supply provided by a gas generator device or a solar energy device. The filter circuit uses a smaller filter capacitor to shorten the transition time of the circuit. The active anti-interference device for buried pipelines provided by the present invention can completely eliminate Any interference generated on the pipeline; due to the combined structure of the inverter and the voltage tracking control module, the output can follow the change of the PWM pulse width modulation signal of the command voltage processing module in time by adopting the tracking PWM control method, so it has output High sensitivity, fast response, good dynamic performance and so on.

The inventor's in-depth research for many years found that the cathodic protection devices in the prior art can rarely eliminate AC interference, and the installation positions of the cathodic protection devices on most buried pipelines are contradictory to anti-interference. For example, from the optimal principle of economic rationality, the cathodic protection device of a section of buried pipeline should be installed in the middle of the pipeline, but the inventor's research shows that, from the perspective of the optimal principle of eliminating high-voltage transmission lines and space interference, a section of pipeline Cathodic protection devices should be installed at both ends of the pipeline. Therefore, the current installation position of the cathodic protection device does not meet the optimal principle of anti-interference. When AC interference exists, the role of the cathodic protection device is: to protect on either side of the installation position of the cathodic protection device, and on the other side One side is underprotected.

For this reason, the inventor proposes the configuration principle of the buried pipeline active anti-jamming device of the present invention according to the characteristics and rules of the buried pipeline affected by interference, which are illustrated by the following examples.

first embodiment

Figure 3 is a schematic diagram of the distribution of the interference voltage generated on the pipeline along the pipeline at a certain time when the high-voltage transmission line and the buried pipeline are distributed in parallel. Figure 4 is the interference voltage generated on the pipeline at a certain time when the high-voltage transmission line and the buried pipeline are distributed across Schematic diagram of the distribution along the pipeline. Aiming at the impact of high-voltage transmission lines on buried pipelines, the inventors concluded the characteristics and rules as follows: when high-voltage transmission lines approach a section of buried pipeline in parallel, the pipe-ground potential at the terminal of the buried pipeline parallel to the high-voltage transmission line is the largest , the pipe-to-ground potential away from the terminal gradually decays along the buried pipeline, as shown in Figure 3. Specifically, the AB section of the buried pipeline 5 is parallel to the high-voltage transmission line 100, and the buried pipeline 5 continues to extend outside the AB section and is far away from the high-voltage transmission line 100. Points A and B of the ground pipeline 5 are the largest, and the potential of the buried pipeline 5 away from points A and B gradually decays. When the buried pipeline crosses the high-voltage transmission line, the pipe-ground potential of the buried pipeline changes the most at the intersection point, and the pipe-ground potential gradually decays along the pipeline away from the intersection point, as shown in Figure 4. Specifically, the buried pipeline 5 intersects the high-voltage transmission line 100 at point C, and the pipeline-ground potential caused by the AC interference of the high-voltage transmission line 100 is the largest at point C of the buried pipeline 5, far away from the point C of the buried pipeline 5. The ground potential of the pipe gradually decays.

If the buried pipeline is close to the high-voltage transmission line in parallel, when configuring the active anti-interference device for the buried pipeline of the present invention, in this embodiment, the active anti-interference device for the buried pipeline of the present invention is arranged at the terminal of the buried pipeline, that is, this The output end of the inventive power output unit 2 is connected to the terminal position of the buried pipeline (points A and B in FIG. 3 ).

If buried pipelines and high-voltage transmission lines are intersected, when configuring the active interference removal device for buried pipelines of the present invention, this embodiment configures the active interference removal device for buried pipelines of the present invention at the intersection of buried pipelines and high-voltage transmission lines , that is, the output end of the power output unit 2 of the present invention is connected at the intersection of the buried pipeline and the high-voltage transmission line (point C in FIG. 4 ).

second embodiment

Figure 5 is a schematic diagram of the distribution of the interference voltage generated on the buried pipeline along the pipeline at a certain moment when the earth's magnetic field changes caused by space weather. In view of the influence of changes in the earth's magnetic field on buried pipelines, the inventors concluded the characteristics and rules as follows: when long-distance buried oil pipelines are equipped with insulating flanges, the largest change in pipe-to-ground potential caused by earth's magnetic field disturbances is at the insulating flanges on both sides, as shown in Figure 5. Specifically, at the insulating flange 101, the insulating flange 102, the insulating flange 103 and the insulating flange 104, it can be seen that the pipe-ground potential of the buried pipeline caused by the change of the earth's magnetic field is close to each insulating flange 101- The two sides of the insulating flange 104 are the largest, and the pipe-ground potential away from the insulating flange 101 to the insulating flange 104 gradually decays.

For buried pipelines equipped with insulating flanges, when space interference is considered, when configuring the active anti-interference device for buried pipelines of the present invention, this embodiment configures the active anti-interference device for buried pipelines of the present invention on the buried pipeline. Both sides of the insulating flange, that is, the output end of the power output unit of the present invention is connected to the positions on both sides of the insulating flange of the buried pipeline (both sides of the insulating flange 101 to the insulating flange 104 in FIG. 5 ).

Fig. 6 is a schematic diagram showing the distribution of interference-removing voltages generated by the active device for removing interference for buried pipelines according to the present invention. As shown in Figure 6, the J place is the confluence point of the buried pipeline active de-interference device of the present invention on the buried pipeline 5, and the pipe-ground potential of the buried pipeline 5 at the J place is the largest, far away from the buried pipeline 5 at the J place. The ground potential of the pipe gradually decays. The solid line in Fig. 6 is the positive direction voltage curve family generated by the active anti-interference device for buried pipelines of the present invention, and the dotted line is the negative direction voltage curve family generated by the active anti-interference device for buried pipelines of the present invention. In this way, the location of the active interference removal device for buried pipelines of the present invention can be selected according to the distribution characteristics and rules of different interference types. In this way, the distribution of the voltage along the pipeline by the buried pipeline active interference removal device of the present invention is consistent with the distribution of the voltage along the pipeline by the interference of the transmission line and the earth's magnetic field on the pipeline, which is more conducive to completely eliminating the interference such as alternation.

In addition, when the cathodic protection device on the buried pipeline has been arranged at or near the above-mentioned location, the active anti-jamming device for the buried pipeline of the present invention can be used in series with the existing cathodic protection device, so that the anode ground bed can be shared , and can avoid excavating the pipeline when the active interference removal device for buried pipelines of the present invention is configured. Potential tracking protection potential given value.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present invention without limitation, although the present invention has been described in detail with reference to the preferred embodiments, those of ordinary skill in the art should understand that the technical solutions of the present invention can be Modifications or equivalent replacements can be made without departing from the spirit and scope of the technical solutions of the present invention.

Claims (6)

1. An active anti-interference device for buried pipelines, including a DC power supply unit for providing DC power, a pipeline-ground potential sensor for detecting the pipeline-ground potential of buried pipelines, and a given potential for providing a given potential The device is characterized in that it also includes a voltage control unit and a power output unit, the voltage control unit is connected with the pipe-ground potential sensor and a given potentiometer, and is used to receive the pipe-ground potential and the given potentiometer sent by the pipe-ground potential sensor. The given potential sent by the potentiometer generates a reference command signal reflecting the ideal interference removal voltage according to the comparison result of the pipe-ground potential and the given potential; at the same time, the voltage control unit is also connected to the output terminal of the power output unit, It is used to monitor the actual interference removal voltage output by the power output unit, and generate a PWM pulse width modulation signal according to the deviation between the actual interference removal voltage and the ideal interference removal voltage; the power output unit includes an inverter and a filter circuit, and the inverter The input terminal of the inverter is connected to the DC power supply unit, the control terminal of the inverter is connected to the voltage control unit, and is used to receive the PWM pulse width modulation signal sent by the voltage control unit, and according to the PWM pulse width modulation signal, the The DC power output by the DC power supply unit is inverted into a bipolar voltage, so that the output of the inverter follows the change of the reference command signal; the input end of the filter circuit is connected to the output end of the inverter, and the output end of the filter circuit They are respectively connected to the auxiliary ground bed and the buried pipeline, and are used to filter the bipolar voltage output by the inverter to form an actual interference-removing voltage that is equal in size and opposite to the pipeline interference and output to the auxiliary ground bed and buried pipeline . 2. The buried pipeline active anti-jamming device according to claim 1, wherein the voltage control unit comprises: The signal processing module is connected with the pipe-ground potential sensor, and is used to receive and process the pipe-ground potential sent by the pipe-ground potential sensor; The command voltage processing module is connected with the signal processing module and the given potentiometer respectively, and is used to receive the pipe-ground potential sent by the signal processing module and the given potential sent by the given potentiometer, and according to the comparison between the pipe-ground potential and the given potential As a result, a reference command signal is generated; The voltage tracking control module is connected to the command voltage processing module and the output terminal of the power output unit respectively, and is used to receive the reference command signal reflecting the ideal interference removal voltage from the command voltage processing module, and receive the actual interference removal from the output terminal of the power output unit Voltage, according to the deviation between the actual interference removal voltage and the ideal interference removal voltage, a PWM pulse width modulation signal is generated; The driving circuit is respectively connected with the voltage tracking control module and the inverter of the power output unit, and controls the inverter to output an actual interference-removing voltage that is equal in magnitude and opposite in direction to the pipeline interference according to the PWM pulse width modulation signal. 3. The buried pipeline active anti-jamming device according to claim 1 or 2, characterized in that, when the buried pipeline approaches the high-voltage transmission line in parallel, the output end of the power output unit is connected to the buried pipeline. terminal position. 4. The buried pipeline active anti-jamming device according to claim 1 or 2, characterized in that, when the buried pipeline and the high-voltage transmission line are cross-distributed, the output end of the power output unit is connected between the buried pipeline and the high-voltage transmission line. Crossing locations of high voltage transmission lines. 5. The buried pipeline active anti-interference device according to claim 1 or 2, characterized in that, when the buried pipeline is equipped with an insulating flange, the output end of the power output unit is connected to the buried pipeline insulation method. The positions on both sides of the blue are used to prevent electromagnetic interference caused by space weather. 6. The buried pipeline active anti-jamming device according to claim 1 or 2, characterized in that it also includes the terminal position of the buried pipeline parallel to the high-voltage transmission line, the intersection of the buried pipeline and the high-voltage transmission line The cathodic protection device at the position or on both sides of the insulating flange of the buried pipeline. The output end of the power output unit is connected in series with the cathodic protection device to jointly protect the buried pipeline.

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