Non-contact power transmission line voltage measurement method and system, computer equipment and storage medium

Abstract

The invention provides a non-contact power transmission line voltage measurement method and system, computer equipment and a storage medium, and belongs to the technical field of power system voltage measurement. The method comprises the following steps: determining equivalent capacitance formed by an inner-layer polar plate and a wire and equivalent capacitance formed by an outer-layer polar plate and the wire to serve as first equivalent capacitance and second equivalent capacitance respectively; equivalent capacitance formed by the outer-layer polar plate and the ground, equivalent capacitance formed by the inner-layer polar plate and the ground and equivalent capacitance formed by the outer-layer polar plate and the inner-layer polar plate are obtained to serve as third equivalent capacitance, fourth equivalent capacitance and fifth equivalent capacitance respectively; determining a first voltage of the to-be-tested power transmission line; determining a correction coefficient of the first voltage; and taking the product of the correction coefficient of the first voltage and the first voltage as the actual voltage of the to-be-measured power transmission line. The problem of capacitive coupling when the non-contact voltage sensor is installed in the power transmission line is solved, and the accuracy of voltage measurement of the power transmission line is improved.

Description

Technical Field

[0001] The present invention belongs to the technical field of power system voltage measurement, and in particular relates to a contactless transmission line voltage measurement method, system, computer equipment and storage medium. Background Art

[0002] The voltage signal of the power system contains a lot of equipment and system operation information. By acquiring steady-state and transient voltage signals and identifying the fingerprint characteristics of voltage signals, real-time monitoring of the power system operation status can be achieved. At the same time, by capturing the early transient information of power system faults, fault prediction and diagnosis can be carried out, which helps dispatchers take necessary measures.

[0003] At present, the first choice for measuring voltage in the power industry is electromagnetic voltage transformer. This voltage transformer is based on the principle of electromagnetic induction, that is, the high voltage of the primary coil is reduced to the low voltage of the secondary coil by electromagnetic induction. Then the secondary voltage is measured by the measuring device to indirectly reflect the actual voltage on the high voltage side.

[0004] However, due to the complexity of three-phase AC transmission lines, the relationship between electric field parameters and voltage is often nonlinear, and there is a problem of multi-parameter coupling, which poses challenges to the accuracy and reliability of non-contact voltage measurement. Summary of the invention

[0005] In view of the deficiencies in the prior art, the present invention provides a contactless transmission line voltage measurement method, system, computer equipment and storage medium.

[0006] In a first aspect, the present invention provides a non-contact transmission line voltage measurement method, comprising:

[0007] Determine the equivalent capacitance formed by the inner electrode plate and the wire and the equivalent capacitance formed by the outer electrode plate and the wire, as the first equivalent capacitance and the second equivalent capacitance respectively; wherein the arc surface formed by the inner electrode plate is half of the cylinder where the arc surface of the inner electrode plate is located; the arc surface formed by the outer electrode plate is half of the cylinder where the arc surface of the outer electrode plate is located; the projections of the center of the cross section of the cylinder where the arc surface of the inner electrode plate is located, the center of the cross section of the cylinder where the arc surface of the outer electrode plate is located and the center of the cross section of the wire in the length direction of the wire coincide;

[0008] Obtaining an equivalent capacitance formed by the outer electrode plate and the earth, an equivalent capacitance formed by the inner electrode plate and the earth, and an equivalent capacitance formed by the outer electrode plate and the inner electrode plate as a third equivalent capacitance, a fourth equivalent capacitance, and a fifth equivalent capacitance, respectively;

[0009] Determine a first voltage of the transmission line to be tested according to the first equivalent capacitance, the second equivalent capacitance, the third equivalent capacitance, the fourth equivalent capacitance and the fifth equivalent capacitance;

[0010] determining a correction factor for the first voltage;

[0011] The product of the correction coefficient of the first voltage and the first voltage is taken as the actual voltage of the power transmission line to be measured.

[0012] Optionally, determining an equivalent capacitance formed by the inner electrode plate and the wire and an equivalent capacitance formed by the outer electrode plate and the wire as a first equivalent capacitance and a second equivalent capacitance, respectively, includes:

[0013] Calculate the first equivalent capacitance C1 according to the following formula:

[0014]

[0015] Among them, ε r1 is the relative dielectric constant of the inner plate; ε0 is the dielectric constant of vacuum; S eq1 is the area of ​​the side of the inner plate close to the wire; r eq1 The shortest distance from any point on the side of the inner plate close to the wire to the wire;

[0016] The second equivalent capacitance C2 is calculated according to the following formula:

[0017]

[0018] Among them, ε r2 is the relative dielectric constant of the outer plate; S eq2 is the area of ​​the side of the outer plate close to the wire; r eq2 It is the shortest distance from any point on the side of the outer plate close to the wire to the wire.

[0019] Optionally, determining the first voltage of the transmission line to be tested according to the first equivalent capacitance, the second equivalent capacitance, the third equivalent capacitance, the fourth equivalent capacitance and the fifth equivalent capacitance includes:

[0020] Get the voltage U of the transmission line to be tested i ;

[0021] Calculate the first voltage U of the transmission line to be tested according to the following formula o :

[0022]

[0023] Among them, C1 is the first equivalent capacitor; C2 is the second equivalent capacitor; C3 is the third equivalent capacitor; C4 is the fourth equivalent capacitor; C5 is the fifth equivalent capacitor.

[0024] Optionally, determining a correction coefficient of the first voltage includes:

[0025] Step 401, obtaining the temperature, relative humidity and ground ion concentration of the surrounding environment of the transmission line to be tested, and performing normalization processing to obtain the normalized temperature T, relative humidity R and ground ion concentration d;

[0026] Step 402: input the normalized temperature T, relative humidity R and ground ion concentration d as nodes of the current BP neural network input layer into the current BP neural network, and calculate the output H of the jth neuron in the hidden layer according to the following formula: j :

[0027]

[0028] Among them, e is a natural constant; is the weight from the first neuron in the input layer to the jth neuron in the hidden layer; is the weight from the second neuron in the input layer to the jth neuron in the hidden layer; is the weight from the third neuron in the input layer to the jth neuron in the hidden layer; is the bias of the jth neuron in the hidden layer; j = 1, 2, 3;

[0029] Step 403, calculate the output Y of the output layer according to the following formula m :

[0030]

[0031] in, is the weight from the jth neuron in the hidden layer to the output layer; b (2) is the bias of the output layer;

[0032] Step 404, calculate the output error E of the output layer according to the following formula:

[0033]

[0034] Wherein, y is the preset correction coefficient;

[0035] Step 405, determining whether the output error of the output layer is greater than a preset error threshold;

[0036] Step 406: if it is greater than, then update the weights and biases of the hidden layer and the output layer to obtain a new BP neural network, and return to execute the operation of step 401;

[0037] Step 407, if it is not greater than, then the output Y of the output layer is m As a correction coefficient for the first voltage.

[0038] In a second aspect, the present invention provides a non-contact power transmission line voltage measurement system, comprising:

[0039] The first determination module is used to determine the equivalent capacitance formed by the inner electrode plate and the wire and the equivalent capacitance formed by the outer electrode plate and the wire, to respectively serve as the first equivalent capacitance and the second equivalent capacitance; wherein the arc surface formed by the inner electrode plate is half of the cylinder where the arc surface of the inner electrode plate is located; the arc surface formed by the outer electrode plate is half of the cylinder where the arc surface of the outer electrode plate is located; the projections of the center of the cross section of the cylinder where the arc surface of the inner electrode plate is located, the center of the cross section of the cylinder where the arc surface of the outer electrode plate is located and the center of the cross section of the wire in the length direction of the wire coincide;

[0040] an acquisition module, used to acquire an equivalent capacitance formed by an outer electrode plate and the earth, an equivalent capacitance formed by an inner electrode plate and the earth, and an equivalent capacitance formed by an outer electrode plate and an inner electrode plate, to respectively serve as a third equivalent capacitance, a fourth equivalent capacitance, and a fifth equivalent capacitance;

[0041] A second determination module, used to determine a first voltage of the transmission line to be tested according to the first equivalent capacitance, the second equivalent capacitance, the third equivalent capacitance, the fourth equivalent capacitance and the fifth equivalent capacitance;

[0042] A third determination module, used to determine a correction coefficient of the first voltage;

[0043] The fourth determination module is used to take the product of the correction coefficient of the first voltage and the first voltage as the actual voltage of the transmission line to be measured.

[0044] Optionally, the first determining module includes:

[0045] The first calculation unit is used to calculate the first equivalent capacitance C1 according to the following formula:

[0046]

[0047] Among them, ε r1 is the relative dielectric constant of the inner plate; ε0 is the dielectric constant of vacuum; S eq1 is the area of ​​the side of the inner plate close to the wire; r eq1 The shortest distance from any point on the side of the inner plate close to the wire to the wire;

[0048] The second calculation unit is used to calculate the second equivalent capacitance C2 according to the following formula:

[0049]

[0050] Among them, ε r2 is the relative dielectric constant of the outer plate; S eq2 is the area of ​​the side of the outer plate close to the wire; r eq2 It is the shortest distance from any point on the side of the outer plate close to the wire to the wire.

[0051] Optionally, the second determining module includes:

[0052] The first acquisition unit is used to obtain the ground voltage U of the transmission line to be tested. i ;

[0053] The third calculation unit is used to calculate the first voltage U of the transmission line to be tested according to the following formula o :

[0054]

[0055] Among them, C1 is the first equivalent capacitor; C2 is the second equivalent capacitor; C3 is the third equivalent capacitor; C4 is the fourth equivalent capacitor; C5 is the fifth equivalent capacitor.

[0056] Optionally, the third determining module includes:

[0057] The second acquisition unit is used to acquire the temperature, relative humidity and ground ion concentration of the surrounding environment of the transmission line to be tested, and perform normalization processing to obtain the normalized temperature T, relative humidity R and ground ion concentration d;

[0058] The fourth calculation unit is used to input the normalized temperature T, relative humidity R and ground ion concentration d as nodes of the current BP neural network input layer into the current BP neural network, and calculate the output H of the jth neuron in the hidden layer according to the following formula: j :

[0059]

[0060] Among them, e is a natural constant; is the weight from the first neuron in the input layer to the jth neuron in the hidden layer; is the weight from the second neuron in the input layer to the jth neuron in the hidden layer; is the weight from the third neuron in the input layer to the jth neuron in the hidden layer; is the bias of the jth neuron in the hidden layer; j = 1, 2, 3;

[0061] The fifth calculation unit is used to calculate the output Y of the output layer according to the following formula m :

[0062]

[0063] in, is the weight from the jth neuron in the hidden layer to the output layer; b (2) is the bias of the output layer;

[0064] The sixth calculation unit is used to calculate the output error E of the output layer according to the following formula:

[0065]

[0066] Wherein, y is the preset correction coefficient;

[0067] A judging unit, used to judge whether an output error of the output layer is greater than a preset error threshold;

[0068] A first determination unit is used to determine to update the weights and biases of the hidden layer and the output layer when the judgment unit determines that the output error of the output layer is greater than a preset error threshold, obtain a new BP neural network, and return to execute the operation of the second acquisition unit;

[0069] The second determining unit is used to determine that the output Y of the output layer is not greater than the preset error threshold when the judging unit determines that the output error of the output layer is not greater than the preset error threshold. m As a correction coefficient for the first voltage.

[0070] In a third aspect, the present invention provides a computer device, comprising a processor and a memory; wherein, when the processor executes a computer program stored in the memory, the steps of the non-contact power transmission line voltage measurement method described in the first aspect are implemented.

[0071] In a fourth aspect, the present invention provides a computer-readable storage medium for storing a computer program; when the computer program is executed by a processor, the steps of the non-contact power transmission line voltage measurement method described in the first aspect are implemented.

[0072] The present invention provides a non-contact transmission line voltage measurement method, system, computer equipment and storage medium. The method realizes non-contact line voltage measurement without damaging the insulation layer of the transmission line, solves the capacitive coupling problem existing when the non-contact voltage sensor is installed in the transmission line, and solves the influence of the environment around the transmission line, such as temperature, humidity and earth ion concentration, on the measurement of the sensor, thereby improving the accuracy of the transmission line voltage measurement. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] In order to more clearly illustrate the technical solution of the present invention, the drawings required for use in the embodiments are briefly introduced below. Obviously, the drawings described below are only embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0074] Figure 1 A schematic diagram of a flow chart of a non-contact transmission line voltage measurement method provided by an embodiment of the present invention;

[0075] Figure 2 An application scenario diagram of the non-contact power transmission line voltage measurement method provided by an embodiment of the present invention;

[0076] Figure 3 A schematic diagram of the structure of a BP neural network algorithm voltage correction model provided by an embodiment of the present invention;

[0077] Figure 4 A schematic structural diagram of a contactless power transmission line voltage measurement system provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0078] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0079] Example 1

[0080] like Figure 1 As shown, this embodiment provides a non-contact transmission line voltage measurement method, including:

[0081] Step 101, determine the equivalent capacitance formed by the inner electrode plate and the wire and the equivalent capacitance formed by the outer electrode plate and the wire, and use them as the first equivalent capacitance and the second equivalent capacitance respectively. Figure 2 As shown, the arc surface formed by the inner plate 1 is half of the cylinder where the inner plate arc surface is located; the arc surface formed by the outer plate 2 is half of the cylinder where the outer plate arc surface is located; the projection of the cross-sectional center of the cylinder where the inner plate arc surface is located, the cross-sectional center of the cylinder where the outer plate arc surface is located and the cross-sectional center of the conductor 3 in the length direction of the conductor coincides. The coupling capacitor probe is a differential capacitive coupling probe in the shape of a semicircular arc surface, which can collect the phase voltage of the overhead line of the power transmission and distribution network.

[0082] Exemplarily, the first equivalent capacitance C1 is calculated according to the following formula:

[0083]

[0084] Among them, ε r1 is the relative dielectric constant of the inner plate; ε0 is the dielectric constant of vacuum; S eq1 is the area of ​​the side of the inner plate close to the wire; r eq1 It is the shortest distance from any point on the side of the inner plate close to the wire to the wire.

[0085] The second equivalent capacitance C2 is calculated according to the following formula:

[0086]

[0087] Among them, ε r2is the relative dielectric constant of the outer plate; S eq2 is the area of ​​the side of the outer plate close to the wire; r eq2 It is the shortest distance from any point on the side of the outer plate close to the wire to the wire.

[0088] Step 102, obtaining an equivalent capacitance formed by the outer electrode plate and the earth, an equivalent capacitance formed by the inner electrode plate and the earth, and an equivalent capacitance formed by the outer electrode plate and the inner electrode plate, as a third equivalent capacitance, a fourth equivalent capacitance, and a fifth equivalent capacitance, respectively.

[0089] Step 103: determining a first voltage of the transmission line to be tested according to the first equivalent capacitance, the second equivalent capacitance, the third equivalent capacitance, the fourth equivalent capacitance and the fifth equivalent capacitance.

[0090] Exemplarily, this step includes obtaining the voltage U of the transmission line to be tested to the ground i .

[0091] Calculate the first voltage U of the transmission line to be tested according to the following formula o :

[0092]

[0093] Among them, C1 is the first equivalent capacitor; C2 is the second equivalent capacitor; C3 is the third equivalent capacitor; C4 is the fourth equivalent capacitor; C5 is the fifth equivalent capacitor.

[0094] Step 104: determine a correction coefficient of the first voltage.

[0095] Different coupling capacitors will affect the voltage divider ratio of the capacitive coupling voltage sensor. In the voltage divider capacitor model obtained based on the spatial capacitance coupling principle, the value of each capacitor directly affects the induced voltage output of the voltage sensor. Changes in the distributed coupling capacitors will affect the input-output transmission relationship of the sensor.

[0096] Overhead transmission lines are located in the wilderness, and fault indicators are installed on poles and towers, which need to withstand the test of complex environments. Since the voltage divider is easily affected by environmental factors, causing the capacitance value to change, the voltage divider model ratio difference formed between the measured line and the sensor is unstable, which can easily affect the measurement accuracy. On the one hand, changes in the atmospheric environment affect the size of the air dielectric constant, change the capacitance of the high-voltage arm of the sensor, and thus cause changes in the voltage divider ratio of the sensor, affecting the measurement accuracy of the sensor; on the other hand, the sensor is located below the overhead transmission line and installed on the transmission tower. The change in the distance between the sensor and the ground affects the induced voltage. Considering the characteristics of the external environmental impact, the change in voltage caused by the external environmental impact is corrected to obtain accurate overhead line voltage information.

[0097] If the non-contact voltage sensor is installed outdoors, it is difficult to avoid the weather with large temperature and humidity differences such as wind, sun, rain, snow, etc. When the other values ​​of the plate are determined, the plate coupling capacitance is proportional to the relative dielectric constant of the medium. The dielectric constant is determined by the medium itself and reflects the ability of the medium to affect the electric field in the electric field. When the temperature rises, the irregular movement of molecules intensifies, making the direction of the dipole moment of each molecule farther away from the direction of the electric field, the orientation polarization weakens, and the dielectric constant decreases; when the humidity increases, the water content in the air increases. Water is a polar molecule, which will increase the polarization strength of the air and thus increase the dielectric constant of the air. According to the capacitance calculation formula, the change in the distance of the sensor to the ground is also an important factor affecting the capacitance change, which affects the coupling capacitance voltage divider ratio of the voltage probe, and then affects the reduction coefficient of the sensor.

[0098] In this embodiment, the correction prediction of the restoration coefficient in restoring the actual voltage from the voltage sensor induced voltage based on the BP neural network is implemented to ensure the measurement accuracy in complex external environmental interference and improve the ability of the fault indicator voltage measurement to resist external environmental interference.

[0099] For example, Figure 3 As shown, step 104 includes:

[0100] Step 401, obtaining the temperature, relative humidity and ground ion concentration of the surrounding environment of the transmission line to be tested, and performing normalization processing to obtain the normalized temperature T, relative humidity R and ground ion concentration d.

[0101] Step 402: input the normalized temperature T, relative humidity R and ground ion concentration d as nodes of the current BP neural network input layer into the current BP neural network, and calculate the output H of the jth neuron in the hidden layer according to the following formula: j :

[0102]

[0103] Among them, e is a natural constant; is the weight from the first neuron in the input layer to the jth neuron in the hidden layer; is the weight from the second neuron in the input layer to the jth neuron in the hidden layer; is the weight from the third neuron in the input layer to the jth neuron in the hidden layer; is the bias of the jth neuron in the hidden layer; j = 1, 2, 3.

[0104] Step 403, calculate the output Y of the output layer according to the following formula m :

[0105]

[0106] in, is the weight from the jth neuron in the hidden layer to the output layer; b (2) is the bias of the output layer.

[0107] Step 404, calculate the output error E of the output layer according to the following formula:

[0108]

[0109] Wherein, y is the preset correction coefficient.

[0110] Step 405, determining whether the output error of the output layer is greater than a preset error threshold.

[0111] Step 406: If it is greater than, update the weights and biases of the hidden layer and the output layer to obtain a new BP neural network, and return to execute the operation of step 401.

[0112] According to the output error E of the network and the step size of the learning rate, the parameters in the network are updated in the direction of gradient descent.

[0113] Update the hidden layer weights and biases:

[0114]

[0115] in, is the updated weight from the i-th node of the input layer to the j-th node of the hidden layer; x1 represents the normalized air temperature; x2 represents the normalized air humidity; x3 represents the normalized earth ion concentration; ω jk is the weight from the jth neuron in the hidden layer to the kth neuron in the output layer; e k is the error of the kth node (neuron) in the output layer; m is the total number of nodes in the output layer.

[0116]

[0117] Update the output layer weights and biases:

[0118]

[0119] Where η is the learning rate; Represents the updated weight from the jth node (neuron) in the hidden layer to the kth node in the output layer. is the updated bias of the kth node in the output layer.

[0120] Step 407, if it is not greater than, then the output Y of the output layer is m As a correction coefficient for the first voltage.

[0121] Step 105: taking the product of the correction coefficient of the first voltage and the first voltage as the actual voltage of the transmission line to be measured.

[0122] In summary, this embodiment provides a non-contact transmission line voltage measurement method, which realizes non-contact line voltage measurement without damaging the insulation layer of the transmission line, solves the capacitive coupling problem existing when the non-contact voltage sensor is installed in the transmission line, and the influence of the environment around the transmission line such as temperature, humidity and earth ion concentration on the sensor measurement, thereby improving the accuracy of transmission line voltage measurement.

[0123] Example 2

[0124] Based on the same inventive concept as Example 1, this embodiment provides a contactless power transmission line voltage measurement system. Since the principle of solving the problem by this system is similar to the aforementioned contactless power transmission line voltage measurement method, the implementation of this system can refer to the implementation of the contactless power transmission line voltage measurement method.

[0125] like Figure 4 As shown, the non-contact transmission line voltage measurement system comprises:

[0126] The first determination module 10 is used to determine the equivalent capacitance formed by the inner electrode plate and the conductor and the equivalent capacitance formed by the outer electrode plate and the conductor, as the first equivalent capacitance and the second equivalent capacitance respectively; wherein the arc surface formed by the inner electrode plate is half of the cylinder where the arc surface of the inner electrode plate is located; the arc surface formed by the outer electrode plate is half of the cylinder where the arc surface of the outer electrode plate is located; the projections of the cross-sectional center of the cylinder where the arc surface of the inner electrode plate is located, the cross-sectional center of the cylinder where the arc surface of the outer electrode plate is located and the cross-sectional center of the conductor in the length direction of the conductor coincide.

[0127] The acquisition module 20 is used to acquire the equivalent capacitance formed by the outer electrode plate and the earth, the equivalent capacitance formed by the inner electrode plate and the earth, and the equivalent capacitance formed by the outer electrode plate and the inner electrode plate, as the third equivalent capacitance, the fourth equivalent capacitance, and the fifth equivalent capacitance, respectively.

[0128] The second determination module 30 is used to determine the first voltage of the transmission line to be tested according to the first equivalent capacitance, the second equivalent capacitance, the third equivalent capacitance, the fourth equivalent capacitance and the fifth equivalent capacitance.

[0129] The third determination module 40 is configured to determine a correction coefficient of the first voltage.

[0130] The fourth determination module 50 is configured to take the product of the correction coefficient of the first voltage and the first voltage as the actual voltage of the transmission line to be measured.

[0131] Exemplarily, the first determining module includes:

[0132] The first calculation unit is used to calculate the first equivalent capacitance C1 according to the following formula:

[0133]

[0134] Among them, ε r1 is the relative dielectric constant of the inner plate; ε0 is the dielectric constant of vacuum; S eq1 is the area of ​​the side of the inner plate close to the wire; r eq1 It is the shortest distance from any point on the side of the inner plate close to the wire to the wire.

[0135] The second calculation unit is used to calculate the second equivalent capacitance C2 according to the following formula:

[0136]

[0137] Among them, ε r2 is the relative dielectric constant of the outer plate; S eq2 is the area of ​​the side of the outer plate close to the wire; r eq2 It is the shortest distance from any point on the side of the outer plate close to the wire to the wire.

[0138] Exemplarily, the second determining module includes:

[0139] The first acquisition unit is used to obtain the ground voltage U of the transmission line to be tested. i .

[0140] The third calculation unit is used to calculate the first voltage U of the transmission line to be tested according to the following formula o :

[0141]

[0142] Among them, C1 is the first equivalent capacitor; C2 is the second equivalent capacitor; C3 is the third equivalent capacitor; C4 is the fourth equivalent capacitor; C5 is the fifth equivalent capacitor.

[0143] Exemplarily, the third determining module includes:

[0144] The second acquisition unit is used to acquire the temperature, relative humidity and ground ion concentration of the surrounding environment of the transmission line to be tested, and perform normalization processing to obtain the normalized temperature T, relative humidity R and ground ion concentration d.

[0145] The fourth calculation unit is used to input the normalized temperature T, relative humidity R and ground ion concentration d as nodes of the current BP neural network input layer into the current BP neural network, and calculate the output H of the jth neuron in the hidden layer according to the following formula: j :

[0146]

[0147] Among them, e is a natural constant; is the weight from the first neuron in the input layer to the jth neuron in the hidden layer; is the weight from the second neuron in the input layer to the jth neuron in the hidden layer; is the weight from the third neuron in the input layer to the jth neuron in the hidden layer; is the bias of the jth neuron in the hidden layer; j = 1, 2, 3.

[0148] The fifth calculation unit is used to calculate the output Y of the output layer according to the following formula m :

[0149]

[0150] in, is the weight from the jth neuron in the hidden layer to the output layer; b (2) is the bias of the output layer.

[0151] The sixth calculation unit is used to calculate the output error E of the output layer according to the following formula:

[0152]

[0153] Wherein, y is the preset correction coefficient.

[0154] The judging unit is used to judge whether the output error of the output layer is greater than a preset error threshold.

[0155] The first determination unit is used to determine to update the weights and biases of the hidden layer and the output layer when the judgment unit determines that the output error of the output layer is greater than a preset error threshold, obtain a new BP neural network, and return to execute the operation of the second acquisition unit.

[0156] The second determining unit is used to determine that the output Y of the output layer is not greater than the preset error threshold when the judging unit determines that the output error of the output layer is not greater than the preset error threshold. m As a correction coefficient for the first voltage.

[0157] For more specific working processes of the above modules, please refer to the corresponding contents disclosed in Example 1, which will not be repeated here.

[0158] Example 3

[0159] This embodiment provides a computer device, including a processor and a memory; wherein the processor implements the steps of the non-contact power transmission line voltage measurement method described in Embodiment 1 when executing a computer program stored in the memory.

[0160] For more specific details of the above method, please refer to the corresponding contents disclosed in Example 1, which will not be repeated here.

[0161] Example 4

[0162] This embodiment provides a computer-readable storage medium for storing a computer program; when the computer program is executed by a processor, the steps of the non-contact power transmission line voltage measurement method described in Embodiment 1 are implemented.

[0163] For more specific details of the above method, please refer to the corresponding contents disclosed in Example 1, which will not be repeated here.

[0164] Example 5

[0165] This embodiment provides a computer program product, including computer executable instructions or a computer program. When the computer executable instructions or the computer program are executed by a processor, the steps of the non-contact power transmission line voltage measurement method described in Embodiment 1 are implemented.

[0166] For more specific details of the above method, please refer to the corresponding contents disclosed in Example 1, which will not be repeated here.

[0167] In this specification, each embodiment is described in a progressive manner, and each embodiment focuses on the differences from other embodiments. The same or similar parts between the embodiments can be referred to each other. For the systems, devices, storage media, and computer program products disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method part description.

[0168] Those skilled in the art can clearly understand that the technology in the embodiments of the present invention can be implemented by means of software plus a necessary general hardware platform. Based on this understanding, the technical solution in the embodiments of the present invention is essentially or the part that contributes to the prior art can be embodied in the form of a software product, which can be stored in a storage medium such as ROM / RAM, a disk, an optical disk, etc., and includes a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment of the present invention or some parts of the embodiments.

[0169] In some embodiments, computer executable instructions may be in the form of a program, software, software module, script or code, written in any form of programming language (including compiled or interpreted languages, or declarative or procedural languages), and may be deployed in any form, including as a stand-alone program or as a module, component, subroutine or other unit suitable for use in a computing environment.

[0170] As an example, computer-executable instructions may, but need not, correspond to a file in a file system, may be stored as part of a file that stores other programs or data, such as in one or more scripts in a HyperText Markup Language (HTML) document, in a single file dedicated to the program in question, or in multiple coordinated files (e.g., files storing one or more modules, subroutines, or code portions).

[0171] As an example, computer executable instructions may be deployed to be executed on one electronic device, or on multiple electronic devices located at one site, or on multiple electronic devices distributed at multiple sites and interconnected by a communication network.

[0172] The present invention has been described in detail above in conjunction with specific implementations and exemplary examples, but these descriptions cannot be understood as limiting the present invention. Those skilled in the art understand that, without departing from the spirit and scope of the present invention, a variety of equivalent substitutions, modifications or improvements may be made to the technical solution of the present invention and its implementation methods, all of which fall within the scope of the present invention. The scope of protection of the present invention shall be subject to the attached claims.

Claims

1. A non-contact transmission line voltage measurement method, characterized in that: include: Determine the equivalent capacitance formed by the inner electrode plate and the wire and the equivalent capacitance formed by the outer electrode plate and the wire, as the first equivalent capacitance and the second equivalent capacitance respectively; wherein the arc surface formed by the inner electrode plate is half of the cylinder where the arc surface of the inner electrode plate is located; the arc surface formed by the outer electrode plate is half of the cylinder where the arc surface of the outer electrode plate is located; the projections of the center of the cross section of the cylinder where the arc surface of the inner electrode plate is located, the center of the cross section of the cylinder where the arc surface of the outer electrode plate is located and the center of the cross section of the wire in the length direction of the wire coincide; Obtaining an equivalent capacitance formed by the outer electrode plate and the earth, an equivalent capacitance formed by the inner electrode plate and the earth, and an equivalent capacitance formed by the outer electrode plate and the inner electrode plate as a third equivalent capacitance, a fourth equivalent capacitance, and a fifth equivalent capacitance, respectively; Determine a first voltage of the transmission line to be tested according to the first equivalent capacitance, the second equivalent capacitance, the third equivalent capacitance, the fourth equivalent capacitance and the fifth equivalent capacitance; determining a correction factor for the first voltage; The product of the correction coefficient of the first voltage and the first voltage is taken as the actual voltage of the power transmission line to be measured.

2. The non-contact power transmission line voltage measurement method according to claim 1, characterized in that: The step of determining an equivalent capacitance formed by the inner electrode plate and the wire and an equivalent capacitance formed by the outer electrode plate and the wire as a first equivalent capacitance and a second equivalent capacitance, respectively, includes: Calculate the first equivalent capacitance C1 according to the following formula: Among them, ε r1 is the relative dielectric constant of the inner plate; ε0 is the dielectric constant of vacuum; S eq1 is the area of ​​the side of the inner plate close to the wire; r eq1 The shortest distance from any point on the side of the inner plate close to the wire to the wire; Calculate the second equivalent capacitance C2 according to the following formula: Among them, ε r2 is the relative dielectric constant of the outer plate; S eq2 is the area of ​​the side of the outer plate close to the wire; r eq2 It is the shortest distance from any point on the side of the outer plate close to the wire to the wire.

3. The non-contact power transmission line voltage measurement method according to claim 1, characterized in that: The method of determining the first voltage of the transmission line to be tested according to the first equivalent capacitance, the second equivalent capacitance, the third equivalent capacitance, the fourth equivalent capacitance and the fifth equivalent capacitance comprises: Get the voltage U of the transmission line to be tested i ; Calculate the first voltage U of the transmission line to be tested according to the following formula o : Among them, C1 is the first equivalent capacitor; C2 is the second equivalent capacitor; C3 is the third equivalent capacitor; C4 is the fourth equivalent capacitor; C5 is the fifth equivalent capacitor.

4. The non-contact transmission line voltage measurement method according to claim 1, characterized in that: The step of determining a correction coefficient for the first voltage comprises: Step 401, obtaining the temperature, relative humidity and ground ion concentration of the surrounding environment of the transmission line to be tested, and performing normalization processing to obtain the normalized temperature T, relative humidity R and ground ion concentration d; Step 402: input the normalized temperature T, relative humidity R and ground ion concentration d as nodes of the current BP neural network input layer into the current BP neural network, and calculate the output H of the jth neuron in the hidden layer according to the following formula: j : Among them, e is a natural constant; is the weight from the first neuron in the input layer to the jth neuron in the hidden layer; is the weight from the second neuron in the input layer to the jth neuron in the hidden layer; is the weight from the third neuron in the input layer to the jth neuron in the hidden layer; is the bias of the jth neuron in the hidden layer; j = 1, 2, 3; Step 403, calculate the output Y of the output layer according to the following formula m : in, is the weight from the jth neuron in the hidden layer to the output layer; b (2) is the bias of the output layer; Step 404, calculate the output error E of the output layer according to the following formula: Wherein, y is the preset correction coefficient; Step 405, determining whether the output error of the output layer is greater than a preset error threshold; Step 406: if it is greater than, then update the weights and biases of the hidden layer and the output layer to obtain a new BP neural network, and return to execute the operation of step 401; Step 407, if it is not greater than, then the output Y of the output layer is m As a correction coefficient for the first voltage.

5. A non-contact transmission line voltage measurement system, characterized in that: include: The first determination module is used to determine the equivalent capacitance formed by the inner electrode plate and the wire and the equivalent capacitance formed by the outer electrode plate and the wire, to respectively serve as the first equivalent capacitance and the second equivalent capacitance; wherein the arc surface formed by the inner electrode plate is half of the cylinder where the arc surface of the inner electrode plate is located; the arc surface formed by the outer electrode plate is half of the cylinder where the arc surface of the outer electrode plate is located; the projections of the center of the cross section of the cylinder where the arc surface of the inner electrode plate is located, the center of the cross section of the cylinder where the arc surface of the outer electrode plate is located and the center of the cross section of the wire in the length direction of the wire coincide; an acquisition module, used to acquire an equivalent capacitance formed by an outer electrode plate and the earth, an equivalent capacitance formed by an inner electrode plate and the earth, and an equivalent capacitance formed by an outer electrode plate and an inner electrode plate, to respectively serve as a third equivalent capacitance, a fourth equivalent capacitance, and a fifth equivalent capacitance; A second determination module, used to determine a first voltage of the transmission line to be tested according to the first equivalent capacitance, the second equivalent capacitance, the third equivalent capacitance, the fourth equivalent capacitance and the fifth equivalent capacitance; A third determination module, used to determine a correction coefficient of the first voltage; The fourth determination module is used to take the product of the correction coefficient of the first voltage and the first voltage as the actual voltage of the transmission line to be measured.

6. The non-contact power transmission line voltage measurement system according to claim 5, characterized in that: The first determining module comprises: The first calculation unit is used to calculate the first equivalent capacitance C1 according to the following formula: Among them, ε r1 is the relative dielectric constant of the inner plate; ε0 is the dielectric constant of vacuum; S eq1 is the area of ​​the side of the inner plate close to the wire; r eq1 The shortest distance from any point on the side of the inner plate close to the wire to the wire; The second calculation unit is used to calculate the second equivalent capacitance C2 according to the following formula: Among them, ε r2 is the relative dielectric constant of the outer plate; S eq2 is the area of ​​the side of the outer plate close to the wire; r eq2 It is the shortest distance from any point on the side of the outer plate close to the wire to the wire.

7. The non-contact power transmission line voltage measurement system according to claim 5, characterized in that: The second determining module comprises: The first acquisition unit is used to obtain the ground voltage U of the transmission line to be tested. i ; The third calculation unit is used to calculate the first voltage U of the transmission line to be tested according to the following formula o : Among them, C1 is the first equivalent capacitor; C2 is the second equivalent capacitor; C3 is the third equivalent capacitor; C4 is the fourth equivalent capacitor; C5 is the fifth equivalent capacitor.

8. The non-contact power transmission line voltage measurement system according to claim 5, characterized in that: The third determination module comprises: The second acquisition unit is used to acquire the temperature, relative humidity and ground ion concentration of the surrounding environment of the transmission line to be tested, and perform normalization processing to obtain the normalized temperature T, relative humidity R and ground ion concentration d; The fourth calculation unit is used to input the normalized temperature T, relative humidity R and ground ion concentration d as nodes of the current BP neural network input layer into the current BP neural network, and calculate the output H of the jth neuron in the hidden layer according to the following formula: j : Among them, e is a natural constant; is the weight from the first neuron in the input layer to the jth neuron in the hidden layer; is the weight from the second neuron in the input layer to the jth neuron in the hidden layer; is the weight from the third neuron in the input layer to the jth neuron in the hidden layer; is the bias of the jth neuron in the hidden layer; j = 1, 2, 3; The fifth calculation unit is used to calculate the output Y of the output layer according to the following formula m : in, is the weight from the jth neuron in the hidden layer to the output layer; b (2) is the bias of the output layer; The sixth calculation unit is used to calculate the output error E of the output layer according to the following formula: Wherein, y is the preset correction coefficient; A judging unit, used to judge whether an output error of the output layer is greater than a preset error threshold; A first determination unit is used to determine to update the weights and biases of the hidden layer and the output layer when the judgment unit determines that the output error of the output layer is greater than a preset error threshold, obtain a new BP neural network, and return to execute the operation of the second acquisition unit; The second determining unit is used to determine that the output Y of the output layer is not greater than the preset error threshold when the judging unit determines that the output error of the output layer is not greater than the preset error threshold. m As a correction coefficient for the first voltage.

9. A computer device, characterized in that: The method comprises a processor and a memory; wherein, when the processor executes the computer program stored in the memory, the steps of the non-contact power transmission line voltage measurement method according to any one of claims 1 to 4 are implemented.

10. A computer-readable storage medium, characterized in that: Used to store computer programs; when the computer programs are executed by the processor, the steps of the non-contact power transmission line voltage measurement method described in any one of claims 1-4 are implemented.

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