Non-intrusive voltage measurement method for extra-high voltage direct current transmission line and related device thereof

Abstract

The application relates to a non-invasive voltage measurement method for an extra-high voltage direct current transmission line and a related device thereof, which comprises the following steps: arranging a differential sensor array composed of at least one group of electric field sensor combinations around a transmission conductor to be measured, and obtaining a first initial electric field value and a second initial electric field value measured by a first electric field sensor and a second electric field sensor in the differential sensor array under an ion flow environment; performing differential processing on the first initial electric field value and the second initial electric field value to obtain an initial differential electric field value; correcting the initial differential electric field value based on a preset scalar restoration correction coefficient to obtain a target differential electric field value. Based on the target differential electric field value and the device parameters of the differential sensor array, a target voltage value of the transmission conductor is calculated. The scheme provided by the application effectively suppresses the ion flow interference in the electric field measurement process by arranging the differential sensor array and performing differential processing and correction, and improves the measurement accuracy and safety of the transmission line.

Description

Technical Field

[0001] This application relates to the field of power transmission line testing technology, and in particular to a non-invasive voltage measurement method and related apparatus for ultra-high voltage direct current transmission lines. Background Technology

[0002] Ultra-high voltage direct current (UHVDC) transmission technology, with its advantages of long distance, large capacity, and low loss, has become a core solution for modern power transmission. In power systems, voltage directly reflects the operating status and fault characteristics of power equipment and transmission lines, making it the most critical parameter.

[0003] Currently, UHVDC voltage measurement methods are still mainly based on contact measurement. The main principle is to reduce the high voltage to a measurable range through voltage division and then transmit it to ground equipment after signal conditioning. However, this method requires the device to be in direct contact with the transmission equipment, which can easily change the topology of the measurement system and cause safety hazards. Non-invasive measurement methods are also used in some measurement scenarios, but UHVDC transmission lines ionize the air around the high-voltage conductors during operation, generating ion flows. These ion flows have a significant impact on measurements based on the electric field method, resulting in inaccurate measured electric fields and errors in calculating the voltage of the transmission line. Summary of the Invention

[0004] To address or partially address the problems existing in related technologies, this application provides a non-invasive voltage measurement method and related device for ultra-high voltage direct current transmission lines. By setting up a differential sensor array and performing differential processing and correction, ion flow interference during electric field measurement is effectively suppressed, thereby improving the measurement accuracy and safety of the transmission line.

[0005] The first aspect of this application provides a non-invasive voltage measurement method for ultra-high voltage direct current (UHVDC) transmission lines, comprising: setting up a differential sensor array consisting of at least one set of electric field sensor combinations around the transmission line to be measured, and acquiring a first initial electric field value and a second initial electric field value measured by a first electric field sensor and a second electric field sensor in a single set of electric field sensor combinations in the differential sensor array under an ion flow environment, respectively; wherein a single set of electric field sensor combinations includes two electric field sensors; performing differential processing on the first initial electric field value and the second initial electric field value to obtain an initial differential electric field value; correcting the initial differential electric field value based on a preset scalar restoration correction coefficient to obtain a target differential electric field value; wherein the preset scalar restoration correction coefficient is used to represent the ratio between the electric field value measured by the electric field sensor in the differential sensor array under an ion flow environment and the electric field value measured by the electric field sensor in the differential sensor array under an ion-free environment; and calculating a target voltage value of the transmission line based on the target differential electric field value and the equipment parameters of the differential sensor array.

[0006] In conjunction with the first aspect, in one possible implementation of the first aspect, the step of performing differential processing on the first initial electric field value and the second initial electric field value to obtain an initial differential electric field value includes: calculating the initial differential electric field value according to the following formula:

[0007]

[0008] in, The initial differential electric field value is... The first initial electric field value, This is the second initial electric field value.

[0009] In conjunction with the first aspect, in one possible implementation of the first aspect, the step of correcting the initial differential electric field value based on a preset scalar restoration correction coefficient to obtain the target differential electric field value includes: calculating the target differential electric field value according to the following formula:

[0010]

[0011] in, The target differential electric field value, The initial differential electric field value is... The preset scalar restoration correction coefficient is used.

[0012] In conjunction with the first aspect, one possible implementation of the first aspect further includes: a first distance between the first electric field sensor and the second electric field sensor in a single set of electric field sensor combinations is less than a preset distance threshold.

[0013] In conjunction with the first aspect, in one possible implementation of the first aspect, setting up a differential sensor array composed of at least one set of electric field sensors around the power transmission line to be tested includes: setting the differential sensor array directly below the power transmission line to be tested; wherein the sensing direction of the sensor is perpendicular to the ground; or, setting the differential sensor array obliquely below the power transmission line to be tested; wherein the sensing direction of the sensor has a preset angle with the ground.

[0014] In conjunction with the first aspect, in one possible implementation of the first aspect, calculating the target voltage value of the transmission line based on the target differential electric field value and the device parameters of the differential sensor array includes: calculating the target voltage value of the transmission line based on the target differential electric field value, the distance between the differential sensor array and the transmission line.

[0015] In conjunction with the first aspect, in one possible implementation of the first aspect, calculating the target voltage value of the transmission line based on the target differential electric field value and the device parameters of the differential sensor array includes: when the differential sensor array is positioned directly below the transmission line to be measured, calculating the first target voltage value of the transmission line according to the following formula:

[0016]

[0017] in, The first target voltage value of the transmission line. The target differential electric field value, This is the second distance between the differential sensor array and the power transmission line.

[0018] In conjunction with the first aspect, in one possible implementation of the first aspect, calculating the target voltage value of the transmission line based on the target differential electric field value and the device parameters of the differential sensor array includes: when the differential sensor array is positioned obliquely below the transmission line to be measured, calculating a second target voltage value of the transmission line according to the following formula:

[0019]

[0020] in, This is the second target voltage value of the transmission line. The target differential electric field value, The second distance is between the differential sensor array and the power transmission line. The preset angle is [value].

[0021] In conjunction with the first aspect, in one possible implementation of the first aspect, the preset angle is 30 degrees to 75 degrees.

[0022] In conjunction with the first aspect, in one possible implementation of the first aspect, the process of obtaining the preset scalar restoration correction coefficient includes: constructing a simulation test based on the preset arrangement, the differential sensor array, and the transmission line to be tested; wherein the simulation test includes a simulated differential sensor array and a simulated transmission line, the parameters of the simulated differential sensor array being consistent with the parameters of the differential sensor array, and the parameters of the simulated transmission line being consistent with the parameters of the transmission line to be tested; applying a preset DC voltage to the simulated transmission line, and obtaining the actual electric field value in an ion flow environment and the nominal electric field value in a non-ion flow environment through the simulated differential sensor array; and obtaining the preset scalar restoration correction coefficient based on the nominal electric field value and the actual electric field value.

[0023] In conjunction with the first aspect, one possible implementation of the first aspect further includes: calculating the preset scalar restoration correction coefficient according to the following formula:

[0024]

[0025] in, The preset scalar restoration correction coefficient is... The actual electric field value is... The nominal electric field value is given.

[0026] In conjunction with the first aspect, one possible implementation of the first aspect further includes: summing the target voltage values ​​corresponding to each group of electric field sensor combinations to obtain a third target voltage value; dividing the third target voltage value by the number of electric field sensor combinations to obtain an average target voltage value; and determining the average target voltage value as the target voltage value of the transmission line.

[0027] A second aspect of this application provides a non-intrusive voltage measurement device for ultra-high voltage direct current transmission lines, comprising:

[0028] The acquisition module is used to set up a differential sensor array consisting of at least one set of electric field sensor combinations around the power transmission line to be tested, and to acquire the first initial electric field value and the second initial electric field value measured by the first electric field sensor and the second electric field sensor in a single set of electric field sensor combinations in the differential sensor array under an ion flow environment, respectively; wherein, a single set of electric field sensor combinations includes two electric field sensors.

[0029] The differential processing module is used to perform differential processing on the first initial electric field value and the second initial electric field value to obtain an initial differential electric field value;

[0030] The correction module is used to correct the initial differential electric field value based on a preset scalar restoration correction coefficient to obtain the target differential electric field value; wherein, the preset scalar restoration correction coefficient is used to represent the ratio between the electric field value measured by the electric field sensor in the differential sensor array under the ion flow environment and the electric field value measured by the electric field sensor in the differential sensor array under the non-ion flow environment.

[0031] The calculation module is used to calculate the target voltage value of the transmission line based on the target differential electric field value and the device parameters of the differential sensor.

[0032] A third aspect of this application provides an electronic device, comprising:

[0033] Processor; and

[0034] A memory that stores executable code, which, when executed by the processor, causes the processor to perform the method described above.

[0035] A fourth aspect of this application provides a computer-readable storage medium having executable code stored thereon, which, when executed by a processor of an electronic device, causes the processor to perform the method described above.

[0036] The fifth aspect of this application provides a computer program product, including a computer program / instructions that, when executed by a processor, implement the method described above.

[0037] The technical solution provided in this application may include the following beneficial effects:

[0038] This application discloses a non-invasive voltage measurement method and related apparatus for ultra-high voltage direct current (UHVDC) transmission lines, comprising: setting up a differential sensor array consisting of at least one set of electric field sensor combinations around the transmission line to be measured; acquiring first initial electric field values ​​and second initial electric field values ​​measured by a first electric field sensor and a second electric field sensor in a single set of electric field sensor combinations in the differential sensor array under an ion flow environment, respectively; wherein, a single set of electric field sensor combinations includes two electric field sensors; performing differential processing on the first initial electric field value and the second initial electric field value to obtain an initial differential electric field value; correcting the initial differential electric field value based on a preset scalar restoration correction coefficient to obtain a target differential electric field value; wherein, the preset scalar restoration correction coefficient is used to represent the ratio between the electric field value measured by the electric field sensor in the differential sensor array under an ion flow environment and the electric field value measured by the electric field sensor in the differential sensor array under an ion-free environment; and calculating the target voltage value of the transmission line based on the target differential electric field value and the equipment parameters of the differential sensor array. In this method, by setting up a differential sensor array and performing differential processing and correction, ion flow interference during electric field measurement is effectively suppressed, thereby improving the measurement accuracy and safety of transmission lines.

[0039] It should be understood that the above general description and the following detailed description are exemplary and explanatory only, and do not limit this application. Attached Figure Description

[0040] The above and other objects, features and advantages of this application will become more apparent from the more detailed description of exemplary embodiments thereof in conjunction with the accompanying drawings, wherein the same reference numerals generally represent the same components in the exemplary embodiments thereof.

[0041] Figure 1 This is a schematic flowchart illustrating a non-intrusive voltage measurement method for ultra-high voltage direct current transmission lines according to an embodiment of this application.

[0042] Figure 2 This is a schematic diagram of the structure of a non-intrusive voltage measurement device for ultra-high voltage direct current transmission lines, as shown in the embodiments of this application.

[0043] Figure 3 This is a schematic diagram of the structure of an electronic device shown in an embodiment of this application;

[0044] Figure 4 This is a schematic diagram of the structure of the simulation experiment shown in the embodiments of this application;

[0045] Figure 5 This is a schematic diagram illustrating the electric field values ​​measured by the electric field sensor in the differential sensor array during a simulation experiment, as shown in the embodiments of this application.

[0046] Figure 6 This is a schematic diagram illustrating the electric field value measured by another electric field sensor in a differential sensor array during a simulation experiment, as shown in an embodiment of this application. Detailed Implementation

[0047] Embodiments of this application will now be described in more detail with reference to the accompanying drawings. While embodiments of this application are shown in the drawings, it should be understood that this application may be implemented in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided to make this application more thorough and complete, and to fully convey the scope of this application to those skilled in the art.

[0048] The terminology used in this application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. The singular forms “a,” “the,” and “the” used in this application and the appended claims are also intended to include the plural forms unless the context clearly indicates otherwise. It should also be understood that the term “and / or” as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0049] It should be understood that although the terms "first," "second," "third," etc., may be used in this application to describe various information, this information should not be limited to these terms. These terms are only used to distinguish information of the same type from one another. For example, without departing from the scope of this application, first information may also be referred to as second information, and similarly, second information may also be referred to as first information. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0050] Ultra-high voltage direct current (UHVDC) transmission technology, with its advantages of long distance, large capacity, and low loss, has become a core solution for modern power transmission. In power systems, voltage directly reflects the operating status and fault characteristics of power equipment and transmission lines, making it the most critical parameter. Currently, UHVDC voltage measurement methods are still mainly contact-based. The main principle is to reduce high voltage to a measurable range through voltage division and then transmit it to ground equipment after signal conditioning. This method has the advantages of mature technology and high measurement accuracy. However, this method requires the device to be in direct contact with the transmission equipment, which can easily alter the topology of the measurement system and cause safety hazards. Furthermore, although fiber optic transmission and quantum sensing technologies offer extremely high accuracy, their high cost limits large-scale deployment.

[0051] Non-invasive measurement methods are used in some measurement scenarios, but during the operation of ultra-high voltage direct current (UHVDC) transmission lines, the air around the high-voltage conductors is ionized, generating ion flows. These ion flows significantly impact measurements based on the electric field method. First, the ion flow field alters the electric field distribution around the conductor, directly causing errors in the electric field sensor. Second, ions from the ion flow field settle on the sensor's metal surface, introducing additional signal interference, leading to inaccurate electric field measurements and consequently errors in calculating the transmission line voltage.

[0052] To address the aforementioned issues, this application provides a non-invasive voltage measurement method for ultra-high voltage direct current transmission lines. By setting up a differential sensor array and performing differential processing and correction, ion flow interference during electric field measurement is effectively suppressed, thereby improving the measurement accuracy and safety of the transmission line.

[0053] The technical solutions of the embodiments of this application are described in detail below with reference to the accompanying drawings.

[0054] Figure 1 This is a schematic flowchart illustrating a non-intrusive voltage measurement method for ultra-high voltage direct current transmission lines, as shown in an embodiment of this application.

[0055] See Figures 1-6 A non-invasive voltage measurement method for ultra-high voltage direct current transmission lines, comprising:

[0056] S110: A differential sensor array consisting of at least one set of electric field sensor combinations is set around the transmission line to be tested, and the first initial electric field value and the second initial electric field value measured by the first electric field sensor and the second electric field sensor in the single set of electric field sensor combinations in the differential sensor array under the ion flow environment are obtained respectively; wherein, the single set of electric field sensor combinations includes two electric field sensors.

[0057] Specifically, the differential sensor array includes a first electric field sensor and a second electric field sensor. The first and second electric field sensors can be placed near the transmission line. The ion flow environment refers to the region of charged ion flow generated by the ionization of air around the high-voltage conductor during the operation of the UHVDC transmission line. Then, the first initial electric field value and the second initial electric field value measured by the first and second electric field sensors in the differential sensor array under the ion flow environment are obtained.

[0058] In one possible implementation, a differential sensor array consisting of at least one set of electric field sensors is arranged around the power transmission line to be tested, including: placing the differential sensor array directly below the power transmission line to be tested; wherein the sensing direction of the sensors is perpendicular to the ground; or, placing the differential sensor array diagonally below the power transmission line to be tested; wherein the sensing direction of the sensors has a preset angle with the ground.

[0059] Specifically, placing the differential sensor array directly below the power transmission line to be measured allows the sensor to primarily detect the vertical electric field component generated by the power transmission line. Placing the differential sensor array diagonally below the power transmission line to be measured creates a preset angle between the sensor's sensing direction and the ground. This preset angle can be 40 degrees, 50 degrees, etc., and is not limited here. This improves the flexibility of on-site deployment. By setting the preset angle, the sensor can effectively capture the oblique electric field component, ensuring accurate electric field measurement even at locations that are not directly below the ground.

[0060] In one possible implementation, the preset angle is 30-75 degrees. Setting the preset angle to 30-75 degrees can avoid the electric field sensor being too small to detect the electric field value of the transmission line well, and also avoid the angle being too large to adapt to the environment.

[0061] In one possible implementation, the first distance between the first electric field sensor and the second electric field sensor in a single electric field sensor combination is less than a preset distance threshold.

[0062] Specifically, the preset distance threshold can be set in advance. For example, if the preset distance threshold is 1 cm and the first distance between the first electric field sensor and the second electric field sensor is 0.5 cm, then the first distance is less than the preset distance threshold. When the sensor spacing is much smaller than the distance from the sensor to the transmission line (e.g., the distance between the sensor and the transmission line is tens of centimeters, while the spacing between the electric field sensors can reach several millimeters, which is an order of magnitude different), it can be approximately considered that the two electric field sensors are located at the same position.

[0063] In one possible implementation, the electric field sensor is any one of a field-milled electric field sensor, a capacitive electric field sensor, or a charge-inductive electric field sensor.

[0064] Specifically, a field-milled electric field sensor is a sensor that modulates an electric field signal through mechanical rotation. It utilizes a rotating, grounded shield to periodically block or expose the sensing electrodes, causing the charge on the electrodes to change periodically over time. This generates an AC signal proportional to the measured electric field strength. After amplification and demodulation, the electric field strength value can be obtained. A capacitive electric field sensor operates based on the principle of capacitance. Its sensing electrodes typically consist of two or more conductors. When a measured electric field is present, charge induction occurs between the sensing electrodes, forming a capacitance related to the electric field strength. By measuring the change in capacitance or the amount of induced charge, the electric field strength can be derived. A charge-induction electric field sensor measures electric field strength by directly sensing the induced charge generated on the conductor surface. When a conductor is placed in an electric field, its surface redistributes charge. The amount of these induced charges is closely related to the electric field strength. By measuring these induced charges through a high-impedance input circuit, the electric field parameters can be obtained. Different electric field sensors can be selected according to actual measurement needs, thus improving the overall accuracy and reliability of non-invasive voltage measurement methods for high-voltage direct current transmission lines.

[0065] In one possible implementation, the differential sensor array further includes a support and a base. The first electric field sensor and the second electric field sensor are the same electric field sensor. The support is disposed on the base, and the first electric field sensor and the second electric field sensor are respectively fixedly disposed on the upper end of the corresponding support.

[0066] Specifically, the support component is a structural part used to fix and support the electric field sensor, ensuring that the electric field sensor remains fixed during measurement and avoiding displacement or attitude changes caused by external environmental disturbances (such as wind or vibration), thereby ensuring the accuracy and consistency of the measurement data. The first and second electric field sensors are identical, ensuring that both sensors acquire essentially the same electric field value under the same electric field environment, thus effectively eliminating common-mode interference during differential processing.

[0067] In one possible implementation, the support is made of an insulating material and the base is made of a metal material.

[0068] Specifically, the support components are made of insulating materials, such as resin and ceramics, which can prevent the support components themselves from accumulating charges, corona discharge, or forming conductive paths in the strong electric field environment generated by the UHVDC transmission line, thereby avoiding interference with the surrounding electric field environment.

[0069] S120: Perform differential processing on the first initial electric field value and the second initial electric field value to obtain the initial differential electric field value.

[0070] Specifically, after obtaining the first and second initial electric field values, these two electric field values ​​can be differentially processed to obtain the initial differential electric field value. This can eliminate some of the interference received by the two electric field sensors, thereby improving the accuracy of the obtained electric field values.

[0071] In one possible implementation, the first initial electric field value and the second initial electric field value are differentially processed to obtain an initial differential electric field value, including:

[0072] The initial differential electric field value is calculated using the following formula:

[0073]

[0074] in, The initial differential electric field value, The first initial electric field value, This is the second initial electric field value.

[0075] Specifically, by using the difference between the first and second initial electric field values, the difference in electric field strength between the two electric field sensors can be obtained. This can suppress common-mode interference and the influence of the background electric field in the ion flow environment, so that the obtained initial differential electric field value can more accurately reflect the electric field gradient information generated by the transmission line, thereby improving the accuracy and stability of the entire non-invasive voltage measurement method.

[0076] S130: Based on the preset scalar restoration correction coefficient, the initial differential electric field value is corrected to obtain the target differential electric field value; wherein, the preset scalar restoration correction coefficient is used to represent the ratio between the electric field value measured by the electric field sensor in the differential sensor array under the ion flow environment and the electric field value measured by the electric field sensor in the differential sensor array under the ion-free environment.

[0077] Specifically, the scalar reduction correction coefficient can be used to quantify the ratio between the measured electric field value under ion flow conditions and the theoretical electric field value under ion flow-free conditions. The scalar reduction correction coefficient can be used to correct the nonlinear effect of ion flow on electric field distribution. The scalar reduction correction coefficient can be a fixed coefficient, for example, it can be calculated based on historical data. After correcting the initial differential electric field value with the scalar reduction correction coefficient, the target differential electric field value can be obtained. The target differential electric field value can reflect the real differential electric field information around the transmission line.

[0078] In one possible implementation, the initial differential electric field value is corrected based on a preset scalar reduction correction coefficient to obtain the target differential electric field value, including:

[0079] The target differential electric field value is calculated using the following formula:

[0080]

[0081] in, For the target differential electric field value, The initial differential electric field value, This is the preset scalar restoration correction coefficient.

[0082] Specifically, the target differential electric field value refers to the differential electric field value after correction for the ion flow effect. It can reflect the difference in electric field measured by the differential sensor array in the absence of ion flow. By using a preset scalar restoration correction coefficient, the ion flow effect can be effectively compensated, thereby obtaining a target differential electric field value that is closer to the real situation.

[0083] In one possible implementation, the process of obtaining the preset scalar restoration correction coefficient includes: constructing a simulation test based on a preset arrangement, a differential sensor array, and the transmission line to be tested; wherein the simulation test includes a simulated differential sensor array and a simulated transmission line, the parameters of the simulated differential sensor array are consistent with the parameters of the differential sensor array, and the parameters of the simulated transmission line are consistent with the parameters of the transmission line to be tested; applying a preset DC voltage to the simulated transmission line, and obtaining the actual electric field value in an ion flow environment and the nominal electric field value in a non-ion flow environment through the simulated differential sensor array; obtaining the preset scalar restoration correction coefficient based on the nominal electric field value and the actual electric field value; wherein the preset scalar restoration correction coefficient is positively correlated with the actual electric field value, and the preset scalar restoration correction coefficient is negatively correlated with the nominal electric field value.

[0084] Specifically, in the constructed simulation experiment, a known and stable preset DC voltage is applied to the simulated transmission line. The electric field values ​​under two different environments are measured using a simulated differential sensor array. First, in the simulated ion flow environment, the simulated differential sensor array measures the actual electric field value. The ion flow environment can be obtained by introducing a corona discharge device to simulate the corona effect around an actual UHVDC transmission line. Then, in the non-ion flow environment, i.e., the ideal state without corona discharge or charged particle flow interference, the simulated differential sensor array measures the nominal electric field value. After obtaining the actual electric field value under the ion flow environment and the nominal electric field value under the non-ion flow environment, a scalar restoration correction coefficient is calculated. This scalar restoration correction coefficient accurately reflects the proportional relationship between the electric field value measured by the electric field sensor under a specific ion flow environment and the electric field value under the ideal non-ion flow environment, ensuring the accuracy and reliability of the scalar restoration correction coefficient and improving the accuracy and stability of subsequent non-invasive voltage measurements of the UHVDC transmission line.

[0085] In one possible implementation, the method further includes: calculating a preset scalar restoration correction coefficient according to the following formula:

[0086]

[0087] in, The preset scalar restoration correction coefficient, This is the actual electric field value. This is the nominal electric field value.

[0088] Specifically, the actual electric field value This refers to the electric field value measured by a simulated differential sensor array during a simulation test, when a preset DC voltage is applied to the simulated power transmission line and an ion flow environment is present. Nominal electric field value. This refers to the electric field value measured by a simulated differential sensor array when a preset DC voltage is applied to the simulated transmission line but it is in an ion-free environment during the same simulation test. The scalar reduction correction coefficient obtained through this ratio relationship can quantify the degree of influence of the ion flow environment on the measured electric field value.

[0089] S140: Calculate the target voltage value of the transmission line based on the target differential electric field value and the equipment parameters of the differential sensor.

[0090] Specifically, the target voltage value can be derived from the target differential electric field value and the second distance through a linear or nonlinear functional relationship. The target voltage value is the final confirmed voltage value of the transmission line. This method realizes non-invasive measurement of the voltage of UHVDC transmission lines in an ion flow environment, improves the accuracy and stability of the measurement results, avoids the safety hazards caused by traditional contact measurement, and reduces the measurement cost.

[0091] In one possible implementation, the target voltage value of the transmission line is calculated based on the target differential electric field value and the device parameters of the differential sensor array, including: calculating the target voltage value of the transmission line based on the target differential electric field value, the distance between the differential sensor array and the transmission line.

[0092] In one possible implementation, the target voltage value of the transmission line is calculated based on the target differential electric field value and the device parameters of the differential sensor, including: when the differential sensor array is positioned directly below the transmission line to be measured, the first target voltage value of the transmission line is calculated according to the following formula:

[0093]

[0094] in, This is the first target voltage value for the transmission line. For the target differential electric field value, This is the second distance between the differential sensor array and the power transmission line.

[0095] Specifically, when the differential sensor array is placed directly below the transmission line to be measured, the electric field distribution between the sensor array and the transmission line has high symmetry. At this time, the second distance is the vertical distance from the sensor array to the transmission line. This formula can be used to obtain the voltage value of the transmission line more accurately, thus improving the practicality and reliability of the non-invasive voltage measurement method.

[0096] In one possible implementation, the target voltage value of the transmission line is calculated based on the target differential electric field value and the device parameters of the differential sensor, including: when the differential sensor array is positioned diagonally below the transmission line to be measured, a second target voltage value of the transmission line is calculated according to the following formula:

[0097]

[0098] in, This is the second target voltage value for the transmission line. For the target differential electric field value, This is the second distance between the differential sensor array and the power transmission line. This is a preset angle.

[0099] Specifically, due to limitations of the actual measurement environment (such as terrain, obstacles) or specific monitoring needs, the differential sensor array can be set diagonally below the power transmission line to be measured. This formula can be used to obtain the voltage value of the power transmission line more accurately.

[0100] In one possible implementation, the method further includes: summing the target voltage values ​​corresponding to each group of electric field sensor combinations to obtain a third target voltage value; dividing the third target voltage value by the number of electric field sensor combinations to obtain an average target voltage value; and determining the average target voltage value as the target voltage value of the transmission line.

[0101] Specifically, by summing and averaging the target voltage values ​​obtained by combining multiple sets of electric field sensors, the error caused by a single electric field sensor combination can be reduced, thus improving the accuracy of the target voltage value of the transmission line.

[0102] This application discloses a non-invasive voltage measurement method for ultra-high voltage direct current (UHVDC) transmission lines, comprising: setting up a differential sensor array consisting of at least one set of electric field sensor combinations around the transmission line to be measured; acquiring first and second initial electric field values ​​measured by a first electric field sensor and a second electric field sensor in a single set of electric field sensor combinations within the differential sensor array under an ion flow environment, respectively; wherein each single set of electric field sensor combinations includes two electric field sensors; performing differential processing on the first and second initial electric field values ​​to obtain an initial differential electric field value; correcting the initial differential electric field value based on a preset scalar restoration correction coefficient to obtain a target differential electric field value; wherein the preset scalar restoration correction coefficient represents the ratio between the electric field value measured by the electric field sensor in the differential sensor array under an ion flow environment and the electric field value measured by the electric field sensor in the differential sensor array under an ion-free environment. Based on the target differential electric field value and the equipment parameters of the differential sensor array, the target voltage value of the transmission line is calculated. In this method, by setting up a differential sensor array and performing differential processing and correction, ion flow interference during electric field measurement is effectively suppressed, thereby improving the measurement accuracy and safety of transmission lines.

[0103] Corresponding to the aforementioned application function implementation method embodiments, this application also provides a non-intrusive voltage measurement device for ultra-high voltage direct current transmission lines, electronic equipment, and corresponding embodiments.

[0104] Figure 2 This is a schematic diagram of the structure of a non-intrusive voltage measurement device for ultra-high voltage direct current transmission lines, as shown in the embodiments of this application.

[0105] See Figure 2 A non-invasive voltage measurement device 200 for ultra-high voltage direct current transmission lines, comprising:

[0106] The acquisition module 210 is used to set up a differential sensor array consisting of at least one set of electric field sensor combinations around the transmission line to be tested, and to acquire the first initial electric field value and the second initial electric field value measured by the first electric field sensor and the second electric field sensor in the single set of electric field sensor combinations in the differential sensor array under the ion flow environment, respectively; wherein, the single set of electric field sensor combinations includes two electric field sensors.

[0107] In one possible implementation, the acquisition module 210 is further configured to place the differential sensor array directly below the power transmission line to be measured, wherein the sensing direction of the sensor is perpendicular to the ground; or, to place the differential sensor array obliquely below the power transmission line to be measured, wherein the sensing direction of the sensor has a preset angle with the ground.

[0108] The differential processing module 220 is used to perform differential processing on the first initial electric field value and the second initial electric field value to obtain the initial differential electric field value.

[0109] In one possible implementation, the differential processing module 220 is further configured to calculate the initial differential electric field value according to the following formula:

[0110]

[0111] in, The initial differential electric field value, The first initial electric field value, This is the second initial electric field value.

[0112] The correction module 230 is used to correct the initial differential electric field value based on a preset scalar restoration correction coefficient to obtain the target differential electric field value; wherein, the preset scalar restoration correction coefficient is used to represent the ratio between the electric field value measured by the electric field sensor in the differential sensor array under the ion flow environment and the electric field value measured by the electric field sensor in the differential sensor array under the ion-free environment.

[0113] In one possible implementation, the correction module 230 is further configured to calculate the target differential electric field value according to the following formula:

[0114]

[0115] in, For the target differential electric field value, The initial difference value, This is the preset scalar restoration correction coefficient.

[0116] In one possible implementation, the calibration module 230 is further configured to construct a simulation test based on a preset arrangement, a differential sensor array, and a transmission line to be tested; wherein the simulation test includes a simulated differential sensor array and a simulated transmission line, the parameters of the simulated differential sensor array being consistent with the parameters of the differential sensor array, and the parameters of the simulated transmission line being consistent with the parameters of the transmission line to be tested; a preset DC voltage is applied to the simulated transmission line, and the actual electric field value in an ion flow environment and the nominal electric field value in a non-ion flow environment are obtained through the simulated differential sensor array; a preset scalar restoration correction coefficient is obtained based on the nominal electric field value and the actual electric field value; wherein the preset scalar restoration correction coefficient is positively correlated with the actual electric field value, and the preset scalar restoration correction coefficient is negatively correlated with the nominal electric field value.

[0117] In one possible implementation, the correction module 230 is further configured to calculate a preset scalar restoration correction coefficient according to the following formula:

[0118]

[0119] in, The preset scalar restoration correction coefficient, This is the actual electric field value. This is the nominal electric field value.

[0120] The calculation module 240 is used to calculate the target voltage value of the transmission line based on the target differential electric field value and the device parameters of the differential sensor.

[0121] In one possible implementation, the calculation module 240 is further configured to calculate a first target voltage value of the transmission line according to the following formula when the differential sensor array is positioned directly below the transmission line to be measured:

[0122]

[0123] in, This is the first target voltage value for the transmission line. For the target differential electric field value, This is the second distance between the differential sensor array and the power transmission line.

[0124] In one possible implementation, the calculation module 240 is further configured to calculate a second target voltage value of the transmission line according to the following formula when the differential sensor array is positioned diagonally below the transmission line to be measured:

[0125]

[0126] in, This is the second target voltage value for the transmission line. For the target differential electric field value, This is the second distance between the differential sensor array and the power transmission line. This is a preset angle.

[0127] In one possible implementation, the calculation module 240 is further configured to sum the target voltage values ​​corresponding to each group of electric field sensor combinations to obtain a third target voltage value; divide the third target voltage value by the number of electric field sensor combinations to obtain an average target voltage value; and determine the average target voltage value as the target voltage value of the transmission line.

[0128] This application discloses a non-invasive voltage measurement device for ultra-high voltage direct current (UHVDC) transmission lines, comprising: an acquisition module, configured to set up a differential sensor array consisting of at least one set of electric field sensor combinations around the transmission line to be measured, and acquire the first initial electric field value and the second initial electric field value measured by the first electric field sensor and the second electric field sensor in a single set of electric field sensor combinations in the differential sensor array under an ion flow environment, respectively; wherein, the single set of electric field sensor combinations includes two electric field sensors; a differential processing module, configured to perform differential processing on the first initial electric field value and the second initial electric field value to obtain an initial differential electric field value; a correction module, configured to correct the initial differential electric field value based on a preset scalar restoration correction coefficient to obtain a target differential electric field value; wherein, the preset scalar restoration correction coefficient is used to represent the ratio between the electric field value measured by the electric field sensor in the differential sensor array under an ion flow environment and the electric field value measured by the electric field sensor in the differential sensor array under an ion-free environment; and a calculation module, configured to calculate the target voltage value of the transmission line based on the target differential electric field value and the device parameters of the differential sensors. In this method, by setting up a differential sensor array and performing differential processing and correction, ion flow interference during electric field measurement is effectively suppressed, thereby improving the measurement accuracy and safety of transmission lines.

[0129] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated further here.

[0130] This application also provides an electronic device. Figure 3 This is a schematic diagram of the hardware structure of an embodiment of the electronic device of this application. The electronic device includes a memory 320 and at least one processor 310. The memory 320 is electrically connected to the at least one processor 310. The memory 320 stores instructions. The at least one processor 310 calls the instructions in the memory 320 to cause the electronic device to execute the non-invasive voltage measurement method for ultra-high voltage direct current transmission lines according to any of the foregoing embodiments of this application.

[0131] Specifically, the processor 310 may include a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits that can be configured to implement the embodiments of this application.

[0132] Memory 320 may include a mass storage device for data or instructions. For example, and not limitingly, memory 320 may include a hard disk drive (HDD), floppy disk drive, flash memory, optical disk, magneto-optical disk, magnetic tape, or Universal Serial Bus (USB) drive, or a combination of two or more of these. Where appropriate, memory 320 may include removable or non-removable (or fixed) media. Where appropriate, memory 320 may be internal or external to the integrated gateway disaster recovery device. In a particular embodiment, memory 320 is non-volatile solid-state memory. In a particular embodiment, memory 320 includes read-only memory (ROM). Where appropriate, the ROM may be a mask-programmed ROM, a programmable ROM (PROM), an erasable PROM (EPROM), an electrically erasable PROM (EEPROM), an electrically rewritable ROM (EAROM), or flash memory, or a combination of two or more of these.

[0133] In one example, the control device may also include a communication interface 330 and a bus 340. The processor 310, memory 320, and communication interface 330 are connected via the bus 340 and communicate with each other.

[0134] The communication interface 330 is mainly used to realize communication between various modules, devices, units and / or equipment in the embodiments of this application.

[0135] Bus 340 includes hardware, software, or both, that couples components of an online data traffic metering device together. For example, and not limitingly, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a Memory 320 bus, a Microchannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable buses, or combinations of two or more of these. Where appropriate, bus 340 may include one or more buses. Although specific buses are described and illustrated in embodiments of this application, any suitable bus or interconnect is contemplated herein.

[0136] Furthermore, in conjunction with the non-invasive voltage measurement method for UHVDC transmission lines described in the above embodiments, this application embodiment can provide a computer-readable storage medium for implementation. This computer-readable storage medium stores instructions that, when executed by a processor, implement any of the non-invasive voltage measurement methods for UHVDC transmission lines described in the above embodiments.

[0137] This application is not limited to the specific configurations and processes described above and shown in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and shown as examples. However, the method process of this application is not limited to the specific steps described and shown. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of this application.

[0138] The functional blocks shown in the above block diagram can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, they can be, for example, electronic circuits, application-specific integrated circuits (ASICs), appropriate firmware, plug-ins, function cards, etc. When implemented in software, the elements of this application are programs or code segments used to perform the required tasks. Programs or code segments can be stored on a machine-readable medium or transmitted over a transmission medium or communication link via data signals carried on a carrier wave. "Machine-readable medium" can include any medium capable of storing or transmitting information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, etc. Code segments can be downloaded via computer networks such as the Internet, intranets, etc.

[0139] It should also be noted that the exemplary embodiments mentioned in this application describe methods or systems based on a series of steps or apparatus. However, this application is not limited to the order of the above steps; that is, the steps can be performed in the order mentioned in the embodiments, or in a different order, or several steps can be performed simultaneously.

[0140] Alternatively, this application also provides a computer program product capable of implementing some or all of the steps of the methods in the above embodiments. The computer program product includes a computer program / instruction that, when executed by a processor, implements some or all of the steps of the methods in the above embodiments.

[0141] The above description is merely a specific implementation of this application. Those skilled in the art will clearly understand that, for the sake of convenience and brevity, the specific working processes of the systems, modules, and units described above can be referred to the corresponding processes in the foregoing method embodiments, and will not be repeated here. It should be understood that the protection scope of this application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in this application, and these modifications or substitutions should all be covered within the protection scope of this application.

Claims

1. A non-invasive voltage measurement method for ultra-high voltage direct current transmission lines, characterized in that, include: A differential sensor array consisting of at least one set of electric field sensor combinations is set around the transmission line to be tested, and the first initial electric field value and the second initial electric field value measured by the first electric field sensor and the second electric field sensor in a single set of electric field sensor combinations in the differential sensor array under an ion flow environment are obtained respectively; wherein, a single set of electric field sensor combinations includes two electric field sensors. The first initial electric field value and the second initial electric field value are processed by difference to obtain the initial differential electric field value; Based on a preset scalar restoration correction coefficient, the initial differential electric field value is corrected to obtain the target differential electric field value; wherein, the preset scalar restoration correction coefficient is used to represent the ratio between the electric field value measured by the electric field sensor in the differential sensor array under ion flow environment and the electric field value measured by the electric field sensor in the differential sensor array under ion flow-free environment. Based on the target differential electric field value and the device parameters of the differential sensor array, the target voltage value of the transmission line is calculated.

2. The method according to claim 1, characterized in that, The step of performing a difference processing on the first initial electric field value and the second initial electric field value to obtain an initial differential electric field value includes: The initial differential electric field value is calculated using the following formula: in, The initial differential electric field value is... The first initial electric field value, This is the second initial electric field value.

3. The method according to claim 1, characterized in that, The step of correcting the initial differential electric field value based on a preset scalar restoration correction coefficient to obtain the target differential electric field value includes: The target differential electric field value is calculated using the following formula: in, The target differential electric field value, The initial differential electric field value is... The preset scalar restoration correction coefficient is used.

4. The method according to claim 1, characterized in that, Also includes: In a single set of electric field sensor combinations, the first distance between the first electric field sensor and the second electric field sensor is less than a preset distance threshold.

5. The method according to claim 1, characterized in that, The step of setting up a differential sensor array around the transmission line to be tested, consisting of at least one set of electric field sensors, includes: The differential sensor array is positioned directly below the power transmission line to be measured; wherein the sensing direction of the electric field sensor is perpendicular to the ground. Alternatively, the differential sensor array can be positioned diagonally below the power transmission line to be measured; wherein the sensing direction of the electric field sensor has a preset angle with the ground.

6. The method according to claim 5, characterized in that, The calculation of the target voltage value of the transmission line based on the target differential electric field value and the device parameters of the differential sensor array includes: The target voltage value of the transmission line is calculated based on the target differential electric field value, the distance between the differential sensor array and the transmission line.

7. The method according to claim 6, characterized in that, The calculation of the target voltage value of the transmission line based on the target differential electric field value and the device parameters of the differential sensor array includes: When the differential sensor array is positioned directly below the transmission line to be measured, the first target voltage value of the transmission line is calculated according to the following formula: in, The first target voltage value of the transmission line. The target differential electric field value, This is the second distance between the differential sensor array and the power transmission line.

8. The method according to claim 6, characterized in that, The calculation of the target voltage value of the transmission line based on the target differential electric field value and the device parameters of the differential sensor array includes: When the differential sensor array is positioned diagonally below the transmission line to be measured, the second target voltage value of the transmission line is calculated according to the following formula: in, This is the second target voltage value of the transmission line. The target differential electric field value, The second distance is between the differential sensor array and the power transmission line. The preset angle is [the angle].

9. The method according to claim 5, characterized in that, The preset angle is 30 degrees to 75 degrees.

10. The method according to claim 1, characterized in that, The process of obtaining the preset scalar restoration correction coefficient includes: A simulation test is constructed based on a preset arrangement, the differential sensor array, and the transmission line to be tested; wherein the simulation test includes a simulated differential sensor array and a simulated transmission line, the parameters of the simulated differential sensor array are consistent with the parameters of the differential sensor array, and the parameters of the simulated transmission line are consistent with the parameters of the transmission line to be tested. A preset DC voltage is applied to the simulated transmission line, and the actual electric field value in the ion flow environment and the nominal electric field value in the non-ion flow environment are obtained through the simulated differential sensor array. The preset scalar restoration correction coefficient is obtained based on the nominal electric field value and the actual electric field value.

11. The method according to claim 10, characterized in that, Also includes: The preset scalar restoration correction coefficient is calculated according to the following formula: in, The preset scalar restoration correction coefficient is... The actual electric field value is given. The nominal electric field value is given.

12. The method according to claim 10, characterized in that, Also includes: The target voltage values ​​corresponding to each group of electric field sensor combinations are summed to obtain the third target voltage value; Divide the third target voltage value by the number of electric field sensor combinations to obtain the average target voltage value; The average target voltage value is determined as the target voltage value of the transmission line.

13. A non-invasive voltage measurement device for ultra-high voltage direct current transmission lines, characterized in that, include: The acquisition module is used to set up a differential sensor array consisting of at least one set of electric field sensor combinations around the power transmission line to be tested, and to acquire the first initial electric field value and the second initial electric field value measured by the first electric field sensor and the second electric field sensor in a single set of electric field sensor combinations in the differential sensor array under an ion flow environment, respectively; wherein, a single set of electric field sensor combinations includes two electric field sensors. The differential processing module is used to perform differential processing on the first initial electric field value and the second initial electric field value to obtain an initial differential electric field value; The correction module is used to correct the initial differential electric field value based on a preset scalar restoration correction coefficient to obtain the target differential electric field value; wherein, the preset scalar restoration correction coefficient is used to represent the ratio between the electric field value measured by the electric field sensor in the differential sensor array under the ion flow environment and the electric field value measured by the electric field sensor in the differential sensor array under the non-ion flow environment. The calculation module is used to calculate the target voltage value of the transmission line based on the target differential electric field value and the device parameters of the differential sensor.

14. An electronic device, characterized in that, include: processor; as well as A memory having executable code stored thereon, which, when executed by the processor, causes the processor to perform the method as described in any one of claims 1-12.

15. A computer-readable storage medium, characterized in that, It stores executable code that, when executed by a processor of an electronic device, causes the processor to perform the method as described in any one of claims 1-12.

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