Corona effect deicing method, device and equipment for ultra-high voltage transmission line

Abstract

The invention provides a corona effect deicing method, device and equipment for an ultra-high voltage transmission line, and the method comprises the steps: obtaining the lead type information, line arrangement information and weather information of the ultra-high voltage transmission line in the ultra-high voltage transmission line; based on the wire type information and the weather information, determining the corona inception field intensity of the ultra-high voltage power transmission line; based on the wire type information and the line arrangement information, determining the maximum surface field intensity of the ice-coating-free wire of the ultra-high voltage power transmission line; based on the corona inception field intensity and the maximum surface field intensity of the non-icing wire, whether the ultra-high voltage transmission line meets a first preset condition is determined; and if the first preset condition is met, deicing the ultra-high voltage power transmission line by using a corona effect. By means of the method, the ultra-high voltage transmission line suitable for corona effect deicing can be determined, and effective deicing and ice prevention of the ultra-high voltage transmission line are achieved through the corona effect.

Description

Technical Field

[0001] The present application relates to the field of power supply technology, and in particular to a method, device and equipment for deicing an ultra-high voltage transmission line using the corona effect. Background Art

[0002] Ultra-UHV transmission lines include ultra-high voltage transmission lines and ultra-high voltage transmission lines. The current ultra-UHV transmission line anti-icing and de-icing technologies are mainly divided into three categories: thermal, mechanical and passive. The electric thermal de-icing technology in thermal de-icing is currently the only anti-icing and de-icing technology used in large-scale engineering projects. However, it is limited by the capacity of the de-icing power supply, the range of de-icing, the need to shut down the line, the long de-icing time, and the high cost. It cannot meet the de-icing requirements of ultra-UHV transmission lines. Mechanical de-icing technology is only suitable for de-icing operations on small sections of lines, and the equipment is expensive. Passive de-icing methods such as anti-icing coatings have problems such as short service life and environmental protection.

[0003] Currently, there is still a lack of an effective way to de-ice ultra-high voltage transmission lines. Summary of the invention

[0004] In view of this, the purpose of the present application is to provide a method, device, equipment and storage medium for deicing ultra-ultra-high voltage transmission lines using the corona effect, which can determine ultra-ultra-high voltage transmission lines suitable for deicing using the corona effect, and use the corona effect to achieve effective deicing of ultra-ultra-high voltage transmission lines.

[0005] In a first aspect, the present application provides a method for deicing an ultra-high voltage transmission line by corona effect, comprising:

[0006] Obtaining conductor type information of ultra-ultra-high voltage transmission lines, line layout information of ultra-ultra-high voltage transmission lines, and weather information;

[0007] Determining the corona initiation field strength of the ultra-high voltage transmission line based on the conductor type information and the weather information;

[0008] Based on the conductor type information and the line layout information, determining the maximum surface field strength of the ice-free conductor of the ultra-high voltage transmission line;

[0009] Based on the corona initiation field strength and the maximum surface field strength of the ice-free conductor, determining whether the ultra-high voltage transmission line meets a first preset condition, wherein the first preset condition is that the maximum surface field strength of the ice-free conductor is less than or equal to the corona initiation field strength;

[0010] If the first preset condition is met, the ultra-high voltage transmission line is de-iced using the corona effect.

[0011] Optionally, the method further includes:

[0012] If the first preset condition is not met, the ultra-high voltage transmission line is modified to obtain a modified ultra-high voltage transmission line, so as to de-ice the modified ultra-high voltage transmission line by utilizing the corona effect.

[0013] Optionally, the transformation of the ultra-high voltage transmission line includes any one or more of the following:

[0014] Increase the number of conductor splits of the ultra-high voltage transmission line, reduce the conductor diameter of the ultra-high voltage transmission line, and increase the height of the conductor of the ultra-high voltage transmission line above the ground.

[0015] Optionally, the weather information includes: weather coefficient, atmospheric pressure and temperature information; the conductor type information includes sub-conductor radius and line type;

[0016] Then, determining the corona initiation field strength of the ultra-high voltage transmission line based on the conductor type information and the weather information includes:

[0017] Performing calculation based on the atmospheric pressure and the temperature information to determine relative air density;

[0018] Based on the weather coefficient, determining the conductor surface roughness coefficient of the ultra-high voltage transmission line;

[0019] The corona initiation field strength of the ultra-high voltage transmission line is determined by calculation based on the conductor surface roughness coefficient, the air relative density, the line type and the sub-conductor radius.

[0020] Optionally, the line layout information includes: an average height of the conductor above the ground, a first distance between the first conductor and the second conductor, and a second distance between virtual images of the first conductor and the second conductor; the conductor type information includes a radius of a split conductor circle and a radius of a sub-conductor;

[0021] Based on the conductor type information and the line layout information, the maximum surface field strength of the ice-free conductor of the ultra-high voltage transmission line is determined, including:

[0022] Based on the radius of the split conductor circle, the radius of the sub-conductor, the number of conductor splits, and the average height of the conductor above the ground, a potential coefficient matrix of the ultra-high voltage transmission line is calculated;

[0023] Calculating based on the potential coefficient matrix to obtain a conductor charge matrix of the ultra-high voltage transmission line;

[0024] Calculating based on the conductor charge matrix, the number of conductor splittings and the sub-conductor radius, to obtain the average field strength of the sub-conductors of the ultra-high voltage transmission line;

[0025] The maximum surface field strength of the ice-free conductor of the ultra-high voltage transmission line is obtained by calculation based on the average field strength of the sub-conductors, the radius of the split conductor circle, and the number of conductor splits.

[0026] Optionally, the method further includes: obtaining a voltage level of the ultra-high voltage transmission line;

[0027] Determining the corona inception voltage of the ultra-high voltage transmission line based on the conductor type and the line layout;

[0028] Based on the voltage level and the corona inception voltage, determining whether the ultra-high voltage transmission line meets a second preset condition, wherein the second preset condition is that the voltage level is greater than or equal to the corona inception voltage;

[0029] If the first preset condition is met, deicing the ultra-high voltage transmission line using the corona effect includes:

[0030] If the first preset condition and the second preset condition are met, the ultra-high voltage transmission line is de-iced using the corona effect.

[0031] Optionally, the ultra-high voltage transmission line is an ultra-high voltage transmission line, and the method further includes:

[0032] Obtaining radio interference information of the ultra-high voltage transmission line;

[0033] Based on the radio interference information, determining whether the ultra-high voltage transmission line meets a third preset condition, wherein the third preset condition is that the radio interference information is less than or equal to a first threshold;

[0034] If the first preset condition is met, the ultra-high voltage transmission line is de-iced by using the corona effect, including: if the first preset condition and the third preset condition are met, the ultra-high voltage transmission line is de-iced by using the corona effect.

[0035] Optionally, if the ultra-high voltage transmission line is an ultra-high voltage transmission line;

[0036] The method further comprises:

[0037] Acquiring audible noise of the UHV transmission line;

[0038] Based on the audible noise, determining whether the UHV transmission line meets a fourth preset condition, wherein the fourth preset condition is that the audible noise is less than or equal to a second threshold;

[0039] If the first preset condition is met, the ultra-high voltage transmission line is de-iced by using the corona effect, including: if the first preset condition and the fourth preset condition are met, the ultra-high voltage transmission line is de-iced by using the corona effect.

[0040] In a second aspect, the present application provides a corona effect deicing device for an ultra-high voltage transmission line, comprising:

[0041] An acquisition unit, used to acquire conductor type information of an ultra-high voltage transmission line, line layout information of an ultra-high voltage transmission line, and weather information;

[0042] A determination unit, configured to determine the corona initiation field strength of the ultra-high voltage transmission line based on the conductor type information and the weather information;

[0043] The determining unit is further used to determine the maximum surface field strength of the ice-free conductor of the ultra-high voltage transmission line based on the conductor type information and the line layout information;

[0044] The determining unit is further used to determine whether the ultra-high voltage transmission line meets a first preset condition based on the corona initiation field strength and the maximum surface field strength of the ice-free conductor, wherein the first preset condition is that the maximum surface field strength of the ice-free conductor is less than or equal to the corona initiation field strength;

[0045] A deicing unit is used to de-ice the ultra-high voltage transmission line by utilizing the corona effect if the first preset condition is met.

[0046] In a third aspect, the present application provides a corona effect deicing device for an ultra-high voltage transmission line, comprising:

[0047] Memory for storing computer programs;

[0048] A processor is used to execute the computer program stored in the memory to implement the steps of the corona effect deicing method for ultra-ultra-high voltage transmission lines as described in the first aspect.

[0049] It can be seen that the present application provides a method, device and equipment for deicing an ultra-ultra-high voltage transmission line by corona effect. In the method, the conductor type information, line layout information and weather information of the ultra-ultra-high voltage transmission line are obtained; based on the conductor type information and weather information, the corona initiation field strength of the ultra-ultra-high voltage transmission line is determined; based on the conductor type information and line layout information, the maximum surface field strength of the un-iced conductor of the ultra-ultra-high voltage transmission line is determined; based on the corona initiation field strength and the maximum surface field strength of the un-iced conductor, it is determined whether the ultra-ultra-high voltage transmission line meets the first preset condition, and the first preset condition is that the maximum surface field strength of the un-iced conductor is less than or equal to the corona initiation field strength; if the first preset condition is met, the ultra-ultra-high voltage transmission line is de-iced by using the corona effect. Through the above method, the ultra-ultra-high voltage transmission line that can be de-iced by the corona effect can be determined, and the corona effect can be used to achieve effective de-icing and anti-icing of the ultra-ultra-high voltage transmission line. BRIEF DESCRIPTION OF THE DRAWINGS

[0050] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present application, and a person skilled in the art can also obtain other drawings based on these drawings.

[0051] Figure 1 It is a flow chart of a method for deicing an ultra-high voltage transmission line by using a corona effect, provided in an embodiment of the present application;

[0052] Figure 2 It is a schematic diagram of calculating the potential coefficient provided by the present application;

[0053] Figure 3 It is a schematic diagram of a solution for measuring radio interference information and audible noise provided in an embodiment of the present application;

[0054] Figure 4 It is a structural schematic diagram of a corona effect deicing device for an ultra-ultra-high voltage transmission line provided in an embodiment of the present application. DETAILED DESCRIPTION

[0055] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0056] To facilitate understanding of the technical solution provided by the present application, the following will describe a method for deicing an ultra-high voltage transmission line by using the corona effect in conjunction with the accompanying drawings. Figure 1 , is a flow chart of a method for deicing an ultra-ultra-high voltage transmission line using corona effect provided in an embodiment of the present application, wherein the method includes S101-S105.

[0057] S101: Acquire conductor type information of the ultra-ultra-high voltage transmission line, line layout information of the ultra-ultra-high voltage transmission line, and weather information.

[0058] In the embodiment of the present application, conductor type information of the ultra-ultra-high voltage transmission line, line layout information of the ultra-ultra-high voltage transmission line, and weather information can be obtained.

[0059] The present application does not limit the specific content of the conductor type information. As an example, the conductor type information may include the sub-conductor radius, line type, split conductor circle radius, and the number of conductor splits. It is understandable that the ultra-high voltage transmission line in the present application is a multi-phase split conductor, and the sub-conductor is any single conductor in the multi-phase split conductor. The line type includes an AC line, a positive polarity DC line, or a negative polarity DC line, which is used to indicate which type of line the ultra-high voltage transmission line is. The split conductor circle radius refers to the radius of the circumscribed circle of the split conductor.

[0060] The present application does not limit the specific content of the line layout information. As an example, the line layout information includes: the average height of the conductor above the ground, the first distance between the first conductor and the second conductor, and the second distance between the virtual images of the first conductor and the second conductor. It can be understood that the first conductor and the second conductor are different phase conductors in the split conductor. As an example, the line layout information may also include the tower type.

[0061] The present application does not limit the specific content of weather information. As an example, weather information includes: weather coefficient, atmospheric pressure and temperature information. It can be understood that the weather coefficient is used to correct the calculation formula of the onset field strength.

[0062] S102: Determine the corona initiation field strength of the ultra-high voltage transmission line based on the conductor type information and weather information.

[0063] It can be understood that the corona initiation field strength corresponds to the corona initiation voltage of the ice-covered conductor. The present application does not limit the specific method of determining the corona initiation field strength of the ultra-ultra-high voltage transmission line based on the conductor type information and the weather information. As an example, the weather information includes: weather coefficient, atmospheric pressure and temperature information; the conductor type information includes the sub-conductor radius and the line type; then the method of determining the corona initiation field strength of the ultra-ultra-high voltage transmission line based on the conductor type information and the weather information includes:

[0064] A1: Calculate based on the atmospheric pressure and the temperature information to determine the relative air density;

[0065] As an example, the present application can calculate based on the following formula to obtain the relative air density.

[0066]

[0067] In the formula, δ represents the relative air density, P represents the temperature information, which can be the local temperature, and T represents the atmospheric pressure, which can be the local atmospheric pressure.

[0068] A2: Based on the weather coefficient, determine the conductor surface roughness coefficient of the ultra-high voltage transmission line.

[0069] This application does not limit the specific value of the weather coefficient. As an example, different weather conditions can be distinguished to divide the ultra-ultra-high voltage transmission line into dry conductors, wet conductors and ice-covered conductors. When the ultra-ultra-high voltage transmission line is a dry conductor, the weather coefficient can be 0.6; when the ultra-ultra-high voltage transmission line is a wet conductor, the weather coefficient can be 0.45; when the ultra-ultra-high voltage transmission line is an ice-covered conductor, the weather coefficient can be 0.2.

[0070] As another example, the weather coefficient can be obtained through experiments. In this application, the surface of the conductor can be smoothed to simulate aging conditions, and voltage-boosting experiments on dry conductors, wet conductors, and ice-covered conductors can be carried out respectively to measure the corona inception voltage of the stranded wire and the corona inception voltage of the smooth conductor with the same diameter. The weather correlation coefficient calculation formula is: α w =U ACSR / U smooth ,. Among them, U ACSR Indicates the corona inception voltage of the ultra-high voltage transmission line, U smooth It represents the corona inception voltage of a smooth round conductor. It is understandable that UHV transmission lines are generally steel-core aluminum stranded wires. Therefore, U ACSR It can also represent the corona inception voltage of the steel core aluminum stranded wire. The present application can obtain a more accurate weather coefficient through experiments, thereby improving the accuracy of subsequent calculations.

[0071] The present application does not limit the specific method of determining the surface roughness coefficient of the conductor of the ultra-ultra-high voltage transmission line based on the weather coefficient. As an example, the present application can directly use the weather coefficient as the surface roughness coefficient of the conductor of the ultra-ultra-high voltage transmission line. As another example, the present application can calculate the surface roughness coefficient of the conductor of the ultra-ultra-high voltage transmission line by the following formula:

[0072] α=α c α t α w ;

[0073] In the formula, α represents the surface roughness coefficient of the conductor of the ultra-high voltage transmission line, α c Indicates the conductor type coefficient of the ultra-high voltage transmission line, α t represents the time aging coefficient of the UHV transmission line, α w Represents the weather factor.

[0074] It is understandable that the present application can also obtain the conductor type coefficient and the time aging coefficient, so as to combine the conductor type coefficient, the time aging coefficient and the weather coefficient to calculate the conductor surface roughness coefficient of the ultra-ultra-high voltage transmission line, and the conductor surface roughness coefficient of the ultra-ultra-high voltage transmission line can be obtained more accurately. The conductor of the ultra-ultra-high voltage transmission line is generally a steel core aluminum stranded wire, and its conductor type coefficient can be 0.82 to 0.9. The time aging coefficient can be determined by the following formula:

[0075]

[0076] In the formula, α t represents the time aging coefficient, k represents the empirical coefficient, t represents the wire installation time, t 0 represents the half-cycle of conductor smoothness aging. The present application does not limit the specific time of the half-cycle of conductor smoothness aging. As an example, assuming that the smoothness of the conductor does not increase due to aging 6 months after the line is installed, then t 0 =90, unit is day.

[0077] A3: The corona inception field strength of the ultra-high voltage transmission line is determined by calculation based on the conductor surface roughness coefficient, air relative density, line type and sub-conductor radius.

[0078] It is understandable that the corona initiation field strength of the ultra-ultra-high voltage transmission line is the corona initiation field strength on the conductor surface. This application does not limit the calculation method for determining the corona initiation field strength of the ultra-ultra-high voltage transmission line. As an example, this application can calculate it through the following formula:

[0079]

[0080] In the formula, E 0 represents the corona initiation field strength, α represents the conductor surface roughness coefficient, δ represents the relative air density, and E m represents the empirical voltage constant, r 0 represents the radius of the sub-conductor, and k represents the empirical coefficient.

[0081] The present application does not limit the specific values ​​of the empirical coefficient and the empirical voltage constant. As an example, the present application can determine the empirical voltage constant and the empirical coefficient according to the line type. When the line type is an AC line, the empirical voltage constant E m=31.0kV / cm, empirical coefficient k = 0.308. When the line type is a positive polarity DC line, the empirical voltage constant E m =33.7kV / cm, empirical coefficient k = 0.24. When the line type is a negative polarity DC line, the empirical voltage constant E m =31.0kV / cm, empirical coefficient k=0.308.

[0082] S103: Determine the maximum surface field strength of the ice-free conductor of the ultra-high voltage transmission line based on the conductor type information and the line layout information.

[0083] The present application does not limit the specific manner of determining the maximum surface field strength of the ice-free conductor of the ultra-ultra-high voltage transmission line based on the conductor type information and the line layout information. As an example, when the line layout information includes: the average height of the conductor above the ground, the first distance between the first conductor and the second conductor, and the second distance between the virtual images of the first conductor and the second conductor; and the conductor type information includes the radius of the split conductor circle, the number of conductor splits, and the radius of the sub-conductor, based on the conductor type information and the line layout information, determining the maximum surface field strength of the ice-free conductor of the ultra-ultra-high voltage transmission line includes the following steps B1-B4:

[0084] B1: Based on the radius of the split conductor circle, the radius of the sub-conductor, the number of conductor splits, and the average height of the conductor above the ground, calculation is performed to obtain the potential coefficient matrix of the ultra-high voltage transmission line.

[0085] The present application does not limit the specific method of the potential coefficient matrix. As an example, the present application can first calculate the equivalent radius of the split wire based on the split wire circle radius, the sub-wire radius and the number of wire splits. The calculation formula of the equivalent radius of the split wire is as follows:

[0086]

[0087] In the formula, r eq represents the equivalent radius of the split conductor, r 0 represents the sub-conductor radius, N represents the number of conductor splits, and R represents the radius of the split conductor circle.

[0088] In the embodiment of the present application, after calculating the equivalent radius of the split conductor, the potential coefficient matrix of the ultra-ultra-high voltage transmission line can be calculated based on the equivalent radius of the split conductor, the number of conductor splits, and the average height of the conductor above the ground. As an example, the potential coefficient matrix of the ultra-ultra-high voltage transmission line can be calculated by the following formula:

[0089] P = [p ij ] N×N ;

[0090]

[0091] In the formula, P represents the potential coefficient matrix, N is the number of wire splits, ε 0 represents the vacuum dielectric constant, r eq Denotes the equivalent radius of the split conductor, d′ ij represents the distance between the virtual images of the first and second conductors, h i Indicates the average height of the conductor above the ground, d ij Represents the distance between the first conductor and the second conductor; it can be understood that the first conductor and the second conductor are different phase conductors in the split conductor, the distance between the first conductor and the second conductor is also the distance between the phase conductors, and the distance between the virtual images of the first conductor and the second conductor is the distance between the virtual images of the phase conductor and other phase conductors.

[0092] like Figure 2 As shown, Figure 2 A schematic diagram of calculating a potential coefficient provided in the present application, where conductors i and j are different phase conductors and can be used as the first conductor and the second conductor respectively, i' represents the virtual image of conductor i, and j' represents the virtual image of conductor j. It can be understood that the distance between the virtual image of the first conductor and the second conductor is the same as the distance between the virtual image of the first conductor and the second conductor, and both can be expressed as d' ij The distance between the first wire and the second wire, and the distance between the virtual images of the first wire and the second wire can be calculated and expressed by the coordinates of the first wire and the coordinates of the second wire. As an example, they can be calculated and expressed by the following formula:

[0093]

[0094] In the formula, d′ ij represents the distance between the virtual images of the first and second conductors, d ij represents the distance between the first conductor and the second conductor, (X i , Y i ) represents the coordinates of the first wire i, (X j , Y j ) represents the coordinates of the second wire j.

[0095] In the embodiment of the present application, the average height of the conductor above the ground can be obtained directly, or by obtaining the height of the conductor hanging point above the ground and the conductor sag, and then calculating the height of the conductor hanging point above the ground and the conductor sag to obtain the average height of the conductor above the ground.

[0096] As an example, the average height of the conductor above the ground is calculated by the following formula:

[0097]

[0098] In the formula, h i Indicates the average height of the conductor above the ground, h tower Indicates the height of the wire hanging point from the ground, f sag Indicates the conductor sag.

[0099] B2: Calculating based on the potential coefficient matrix to obtain the conductor charge matrix of the ultra-high voltage transmission line;

[0100] The present application does not limit the specific calculation method of the wire charge matrix. As an example, it can be calculated using the following formula.

[0101] Q=[q m ] N×1 =P -1 U;

[0102] In the formula, Q represents the wire charge matrix, q m It represents the surface charge on the m-phase unit length conductor, and the unit is kV / cm, P represents the potential coefficient matrix, U represents the voltage matrix, and N represents the number of conductor splits.

[0103] It is understandable that the present application also needs to obtain a voltage matrix, so as to combine the voltage matrix and the potential coefficient matrix for calculation to obtain the conductor charge matrix of the ultra-ultra-high voltage transmission line.

[0104] B3: Calculate based on the conductor charge matrix, the number of conductor splits and the radius of the sub-conductor to obtain the average field strength of the sub-conductors of the ultra-high voltage transmission line.

[0105] The present application does not limit the specific calculation method of the average field strength of the sub-conductor of the ultra-ultra-high voltage transmission line. As an example, the average field strength of the sub-conductor of the ultra-ultra-high voltage transmission line can be calculated by the following formula:

[0106]

[0107] In the formula, E av represents the average electric field strength of the sub-conductor, q m represents the surface charge per unit length of the m-phase conductor, ε 0 represents the dielectric constant in vacuum, N represents the number of wire splits, r 0 Indicates the sub-conductor radius.

[0108] B4: Based on the average field strength of the sub-conductors, the radius of the split conductor circle, and the number of conductor splits, calculation is performed to obtain the maximum surface field strength of the ice-free conductor of the ultra-high voltage transmission line.

[0109] This application does not limit the specific calculation method of the maximum surface field strength of the un-ice-covered wire. As an example, it can be calculated by the following formula:

[0110]

[0111] In the formula, E max It represents the maximum surface field strength of the un-ice-covered conductor, E av represents the average electric field strength of the sub-conductor, q m represents the surface charge on the m-phase unit length wire, N represents the number of wire splits, r 0 represents the sub-wire radius, and R represents the split wire circle radius.

[0112] S104: Based on the corona initiation field strength and the maximum surface field strength of the un-iced conductor, determine whether the ultra-high voltage transmission line meets a first preset condition, the first preset condition being that the maximum surface field strength of the un-iced conductor is less than or equal to the corona initiation field strength.

[0113] In an embodiment of the present application, after obtaining the corona initiation field strength and the maximum surface field strength of the un-iced conductor, it can be determined whether the ultra-high voltage transmission line meets the first preset condition by comparing the corona initiation field strength and the maximum surface field strength of the un-iced conductor.

[0114] S105: If the first preset condition is met, de-icing the ultra-high voltage transmission line using the corona effect.

[0115] In the embodiment of the present application, when it is determined that the maximum surface field strength of the un-iced conductor is less than or equal to the corona initiation field strength, it is determined that the first preset condition is met, and the corona effect can be used to de-ice the ultra-high voltage transmission line.

[0116] It is understandable that ice on ultra-high voltage transmission lines will increase the roughness of the conductors and distort the electric field, causing corona discharge on iced conductors at low voltages. Corona losses under normal circumstances are detrimental to economic interests and need to be reduced. However, increasing the field strength on the conductor surface in iced conditions can help suppress ice, and the corona effect can help melt the ice, which can enhance the anti-icing performance of the line.

[0117] Through the above method, the ultra-ultra-high voltage transmission lines that can be used for deicing using the corona effect can be determined, the conductor type information and line layout information of the ultra-ultra-high voltage transmission lines that are suitable for deicing using the corona effect can be determined, and the corona effect can be used to achieve effective deicing and anti-icing of ultra-ultra-high voltage transmission lines.

[0118] As a possible implementation method, a method for deicing an ultra-ultra-high voltage transmission line using corona effect provided in the present application also includes the following steps: if the first preset condition is not met, the ultra-ultra-high voltage transmission line is modified to obtain a modified ultra-ultra-high voltage transmission line, so as to de-ice the modified ultra-ultra-high voltage transmission line using the corona effect.

[0119] It is understandable that if the first preset condition is not met, it means that the current ultra-high voltage transmission line is not suitable for the deicing method of the corona effect. Therefore, the ultra-high voltage transmission line can be modified. It is understandable that the present application modifies the circuit in the direction of increasing the corona thermal effect.

[0120] The present application does not limit the specific method of modifying the ultra-ultra-high voltage transmission line. As a possible implementation method, the modification of the ultra-ultra-high voltage transmission line includes any one or more of the following: increasing the number of conductor splits of the ultra-ultra-high voltage transmission line, reducing the conductor diameter of the ultra-ultra-high voltage transmission line, and increasing the conductor height of the ultra-ultra-high voltage transmission line above the ground.

[0121] It can be understood that the present application can effectively enhance the corona thermal effect by increasing the number of conductor splits, reducing the conductor diameter, and increasing the height of the conductor above the ground, and better utilize the corona effect to achieve effective de-icing and anti-icing of ultra-high voltage transmission lines.

[0122] As a possible implementation, the present application provides an ultra-high voltage transmission line, wherein the method further comprises the following steps:

[0123] C1: Obtain the voltage level of the ultra-high voltage transmission line.

[0124] It can be understood that the voltage level of the ultra-high voltage transmission line is used to indicate the voltage value corresponding to the ultra-high voltage transmission line.

[0125] C2: Determine the corona inception voltage of the ultra-high voltage transmission line based on the conductor type and the line layout.

[0126] The present application does not limit the specific method of determining the corona inception voltage of the ultra-ultra-high voltage transmission line based on the conductor type and line layout. As an example, the present application conducts voltage-increasing experiments on non-iced conductors and naturally iced conductors with different conductor types and line layouts, and records the iced corona inception voltage and non-iced corona inception voltage under various types of conductors and line layouts, so as to obtain the corresponding relationship between the conductor type, line layout and corona inception voltage. Therefore, after determining the conductor type and line layout, the corona inception voltage of the ultra-ultra-high voltage transmission line can be determined in combination with the corresponding relationship.

[0127] C3: Based on the voltage level and the corona inception voltage, determine whether the ultra-high voltage transmission line meets a second preset condition, where the second preset condition is that the voltage level is greater than or equal to the corona inception voltage.

[0128] In the embodiment of the present application, after the voltage level and the corona inception voltage are obtained, it can be determined whether the ultra-high voltage transmission line meets the second preset condition by comparing the voltage level and the corona inception voltage.

[0129] If S105 satisfies the first preset condition, the ultra-high voltage transmission line is de-iced by using the corona effect, including: if the first preset condition and the second preset condition are met, the ultra-high voltage transmission line is de-iced by using the corona effect.

[0130] It is understandable that the present application requires that the ultra-high voltage transmission line simultaneously satisfies the first preset condition and the second preset condition before confirming that the ultra-high voltage transmission line can utilize the corona discharge thermal effect for passive deicing and anti-icing.

[0131] For example, if under a certain conductor type and line layout, when the voltage is boosted to AC (Alternating Current) 510kV, corona discharge is observed on ice-covered conductors, it is considered that the conductor type and line layout can use the thermal effect of corona discharge for passive deicing at voltage levels above that, thereby improving the anti-icing performance of the line, such as AC 750kV. Under this conductor type and line layout, when the non-ice conductor is at AC 800kV, corona discharge occurs on the non-ice conductor, and it is considered that the ultra-high voltage transmission line with a line voltage level of AC 750kV can use the corona thermal effect for deicing. However, under this layout, the surface field strength of the non-ice-covered conductor of the AC1000kV line exceeds the corona initiation field strength, and the corona thermal effect cannot be used for deicing.

[0132] As a possible implementation, when the ultra-high voltage transmission line is an ultra-high voltage transmission line, the ultra-high voltage transmission line corona effect deicing method provided in the present application further includes the following steps:

[0133] D1: Obtaining radio interference information of the ultra-high voltage transmission line.

[0134] D2: Based on the radio interference information, determine whether the ultra-high voltage transmission line meets a third preset condition, where the third preset condition is that the radio interference information is less than or equal to a first threshold.

[0135] It is understandable that with the continuous increase in the transmission voltage level, the audible noise and radio interference generated by corona discharge become more serious. Among them, for ultra-high voltage lines, radio interference (RI) is a control condition for its line design. Therefore, this application needs to obtain the radio interference information of the ultra-high voltage transmission line, and determine whether the radio interference information is less than or equal to the first threshold. If the radio interference information is less than or equal to the first threshold, it is determined that the ultra-high voltage transmission line meets the third preset condition.

[0136] This application does not limit the specific method of obtaining radio interference information of ultra-high voltage transmission lines. As an example, Figure 3 As shown, Figure 3 A schematic diagram of a scheme for measuring radio interference information and audible noise provided in an embodiment of the present application. The present application measures RI with a measuring instrument at a projection of 20m from the edge phase conductor. Among them, RI is measured using a magnetic field antenna or an electric field antenna, and the RI value of 0.5MHz is analyzed in detail.

[0137] As another possible implementation, the present application may also calculate RI using the CISPR empirical formula, as shown below:

[0138]

[0139] In the formula, SNR represents the radio interference signal-to-noise ratio, in decibels (dB), g max represents the maximum potential gradient on the surface of the sub-conductor, g 0 represents the reference potential gradient of the sub-conductor; D i Represents the distance between the calculation point and the measured conductor, r 0 represents the radius of the sub-conductor, f represents the measurement frequency, and f 0 Denotes the reference frequency, D 0 represents the reference distance, and Δf represents the reference passband. It is understandable that the present application can represent RI by radio interference signal-to-noise ratio SNR. It is understandable that the calculation point can be the measurement point mentioned above.

[0140] The present application does not limit the specific size of the first threshold, and the first threshold can be set according to actual needs. As an example, the first threshold can be 58 decibels, that is, the present application requires a radio interference signal-to-noise ratio SNR ≤ 58 dB.

[0141] If the first preset condition is met in S105, the ultra-high voltage transmission line is de-iced by using the corona effect, including: if the first preset condition and the third preset condition are met, the ultra-high voltage transmission line is de-iced by using the corona effect.

[0142] In the embodiment of the present application, when the ultra-ultra-high voltage transmission line is an ultra-high voltage transmission line, the ultra-high voltage transmission line is required to meet the first preset condition and the third preset condition at the same time to confirm that the ultra-ultra-high voltage transmission line can utilize the corona discharge thermal effect for passive deicing and anti-icing, and the ultra-ultra-high voltage transmission line that can be used for corona effect deicing can be determined more accurately.

[0143] As a possible implementation, if the ultra-high voltage transmission line is an ultra-high voltage transmission line, the ultra-high voltage transmission line corona effect deicing method provided in the present application further includes the following steps:

[0144] E1: Obtain the audible noise of the UHV transmission line.

[0145] E2: Based on the audible noise, determine whether the UHV power transmission line meets a fourth preset condition, where the fourth preset condition is that the audible noise is less than or equal to a second threshold.

[0146] It can be understood that for UHV transmission lines, audible noise (AN) is a control condition for their line design. Therefore, this application needs to obtain the audible noise of the UHV transmission line and determine whether the audible noise is less than or equal to the second threshold. If the audible noise is less than or equal to the first threshold, it is determined that the UHV transmission line meets the fourth preset condition. As an example, the audible noise can be the audible noise at a projection of 20m from the edge phase.

[0147] This application does not limit the specific method of obtaining the audible noise of the ultra-high voltage transmission line. As an example, Figure 3 As shown, Figure 3 A schematic diagram of a scheme for measuring radio interference information and audible noise provided in an embodiment of the present application. The present application can measure AN with a measuring instrument at a projection of 20m from the edge phase conductor. AN is measured using an A-weighted sound level meter.

[0148] As another possible implementation, the present application may calculate the audible noise by the following formula:

[0149] The calculation formula for the audible noise generated by AC ultra-high voltage transmission lines under rainy conditions is as follows:

[0150] L WA,i =-123+97.2lg(g max,i )+19.1lgN+41.7lg(2r 0 );

[0151] In the formula, L WA,i It represents the A-weighted sound pressure level of the audible noise per unit length of the i-th phase conductor, g max,irepresents the maximum potential gradient on the surface of the i-th phase conductor, N represents the number of conductor splits, r 0 Indicates the sub-conductor radius. As an example, the valid range of the number of conductor splits is 4 to 12.

[0152] The calculation formula for the audible noise generated by the DC ultra-high voltage transmission line under sunny conditions is:

[0153] L WA,i =-133.4+86lg(g max,i )+40lg(2r eq );

[0154] In the formula, L WA,i It represents the A-weighted sound pressure level of the audible noise per unit length of the i-th phase conductor, g max,i represents the maximum potential gradient on the surface of the i-th phase conductor, r eq Indicates the equivalent radius of the split wire.

[0155] The cumulative percentage level of audible noise generated by multi-phase split conductors can be calculated using the following formula:

[0156]

[0157] In the formula, L 50 Indicates the value that the A-weighted sound pressure level measured by the sound pressure meter exceeds 50% of the time during the measurement period, D i Indicates the distance between the calculation point and the measured conductor, L WA,i It represents the A-weighted sound pressure level of the audible noise per unit length of the i-th phase conductor.

[0158] The present application does not limit the specific value of the second threshold. As an example, when the audible noise is the audible noise at a projection of 20m from the edge phase, for an AC UHV line, on a rainy day, L 50 ≤55dB; for UHV DC lines, on sunny days L 50 ≤55dB. That is, the second threshold in the present application may be 55 decibels.

[0159] If the first preset condition is met in S105, the ultra-high voltage transmission line is de-iced by using the corona effect, including: if the first preset condition and the fourth preset condition are met, the ultra-high voltage transmission line is de-iced by using the corona effect.

[0160] In the embodiment of the present application, when the ultra-ultra-high voltage transmission line is an ultra-high voltage transmission line, the ultra-high voltage transmission line needs to satisfy both the first preset condition and the fourth preset condition to confirm that the ultra-ultra-high voltage transmission line can utilize the corona discharge thermal effect for passive deicing and anti-icing, and the ultra-ultra-high voltage transmission line that can be used for corona effect deicing can be determined more accurately.

[0161] The following is an introduction to an ultra-high voltage transmission line deicing device provided in an embodiment of the present application. The device described below and the ultra-high voltage transmission line deicing method using corona effect described above can be referred to in correspondence with each other. Figure 4 , Figure 4 A schematic structural diagram of a deicing device for an ultra-high voltage transmission line provided in an embodiment of the present application, the device includes an acquisition unit 401, a determination unit 402 and a deicing unit 403.

[0162] The acquisition unit 401 is used to acquire conductor type information of the ultra-high voltage transmission line, line layout information of the ultra-high voltage transmission line, and weather information;

[0163] A determination unit 402, configured to determine the corona initiation field strength of the ultra-high voltage transmission line based on the conductor type information and the weather information;

[0164] The determining unit 402 is further configured to determine the maximum surface field strength of the ice-free conductor of the ultra-high voltage transmission line based on the conductor type information and the line layout information;

[0165] The determining unit 402 is further configured to determine whether the ultra-high voltage transmission line meets a first preset condition based on the corona initiation field strength and the maximum surface field strength of the ice-free conductor, wherein the first preset condition is that the maximum surface field strength of the ice-free conductor is less than or equal to the corona initiation field strength;

[0166] The deicing unit 403 is used to de-ice the ultra-high voltage transmission line by utilizing the corona effect if the first preset condition is met.

[0167] As a possible implementation manner, the device further includes:

[0168] The transformation unit is used to transform the ultra-ultra-high voltage transmission line if the first preset condition is not met, so as to obtain a transformed ultra-ultra-high voltage transmission line, so as to de-ice the transformed ultra-ultra-high voltage transmission line by utilizing the corona effect.

[0169] As a possible implementation method, the transformation unit is specifically used to transform the ultra-high voltage transmission line, including any one or more of the following: increasing the number of conductor splits of the ultra-high voltage transmission line, reducing the conductor diameter of the ultra-high voltage transmission line, and increasing the height of the conductor of the ultra-high voltage transmission line above the ground.

[0170] As a possible implementation, the weather information includes: weather coefficient, atmospheric pressure and temperature information; the conductor type information includes sub-conductor radius and line type;

[0171] The determining unit 402 is specifically configured to:

[0172] Performing calculation based on the atmospheric pressure and the temperature information to determine relative air density;

[0173] Based on the weather coefficient, determining the conductor surface roughness coefficient of the ultra-high voltage transmission line;

[0174] The corona initiation field strength of the ultra-high voltage transmission line is determined by calculation based on the conductor surface roughness coefficient, the air relative density, the line type and the sub-conductor radius.

[0175] As a possible implementation, the line arrangement information includes: an average height of the conductor above the ground, a first distance between the first conductor and the second conductor, and a second distance between virtual images of the first conductor and the second conductor; the conductor type information includes a radius of a split conductor circle, a number of conductor splits, and a sub-conductor radius;

[0176] Then the determining unit 402 is specifically configured to:

[0177] Based on the radius of the split conductor circle, the radius of the sub-conductor, the number of conductor splits, and the average height of the conductor above the ground, a potential coefficient matrix of the ultra-high voltage transmission line is calculated;

[0178] Calculating based on the potential coefficient matrix to obtain a conductor charge matrix of the ultra-high voltage transmission line;

[0179] Calculating based on the conductor charge matrix, the number of conductor splittings and the sub-conductor radius, to obtain the average field strength of the sub-conductors of the ultra-high voltage transmission line;

[0180] The maximum surface field strength of the ice-free conductor of the ultra-high voltage transmission line is obtained by calculation based on the average field strength of the sub-conductors, the radius of the split conductor circle, and the number of conductor splits.

[0181] As a possible implementation, the acquisition unit 401 is further used to acquire the voltage level of the ultra-high voltage transmission line;

[0182] The device also includes:

[0183] The determining unit 402 is further configured to determine the corona inception voltage of the ultra-high voltage transmission line based on the conductor type and the line layout;

[0184] The determining unit 402 is further configured to determine whether the ultra-high voltage transmission line meets a second preset condition based on the voltage level and the corona inception voltage, wherein the second preset condition is that the voltage level is greater than or equal to the corona inception voltage;

[0185] The deicing unit 403 is also used for:

[0186] If the first preset condition and the second preset condition are met, the ultra-high voltage transmission line is de-iced using the corona effect.

[0187] As a possible implementation, the ultra-high voltage transmission line is an ultra-high voltage transmission line, and the device further includes:

[0188] The acquisition unit 401 is further used to acquire the radio interference information of the ultra-high voltage transmission line;

[0189] The determining unit 402 is further configured to determine whether the ultra-high voltage transmission line meets a third preset condition based on the radio interference information, wherein the third preset condition is that the radio interference information is less than or equal to a first threshold;

[0190] The deicing unit 403 is specifically used to: if the first preset condition and the third preset condition are met, deicing the ultra-high voltage transmission line by utilizing the corona effect.

[0191] As a possible implementation, if the ultra-high voltage transmission line is an ultra-high voltage transmission line; the device further includes:

[0192] The acquisition unit 401 is used to acquire the audible noise of the UHV transmission line;

[0193] The determining unit 402 is further configured to determine whether the UHV transmission line meets a fourth preset condition based on the audible noise, wherein the fourth preset condition is that the audible noise is less than or equal to a second threshold;

[0194] The deicing unit 403 is specifically used to: if the first preset condition and the fourth preset condition are met, deicing the UHV power transmission line by utilizing the corona effect.

[0195] It should be noted that the de-icing device for an ultra-high voltage transmission line provided in the embodiment of the present application has the technical effects of any of the above embodiments, and the embodiments of the present application are not described in detail here.

[0196] The present application also provides a de-icing device for an ultra-high voltage transmission line, which may include a memory and a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the method for de-icing the ultra-high voltage transmission line by corona effect as described in the above embodiment is implemented.

[0197] It should be noted that the de-icing equipment for an ultra-high voltage transmission line provided in the embodiment of the present application has the technical effects of any of the above embodiments, and the embodiments of the present application are not described in detail here.

[0198] The present application also provides a computer-readable storage medium on which a computer program is stored, and when the computer program is executed, the steps provided in the above embodiment can be implemented. The storage medium may include: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes.

[0199] It should be noted that a computer-readable storage medium provided in an embodiment of the present application has the technical effects of any of the above embodiments, and the embodiments of the present application are not described in detail here.

[0200] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0201] It should also be noted that, in this article, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0202] Specific examples are used herein to illustrate the principles and implementation methods of the present application, and the description of the above embodiments is only used to help understand the method and core ideas of the present application. It should be pointed out that for ordinary technicians in this technical field, without departing from the principles of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the scope of protection of the claims of the present application.

Claims

1. A method for deicing ultra-high voltage transmission lines by corona effect, characterized in that: The method comprises: Obtaining conductor type information of ultra-ultra-high voltage transmission lines, line layout information of ultra-ultra-high voltage transmission lines, and weather information; Determining the corona initiation field strength of the ultra-high voltage transmission line based on the conductor type information and the weather information; Based on the conductor type information and the line layout information, determining the maximum surface field strength of the ice-free conductor of the ultra-high voltage transmission line; Based on the corona initiation field strength and the maximum surface field strength of the ice-free conductor, determining whether the ultra-high voltage transmission line meets a first preset condition, wherein the first preset condition is that the maximum surface field strength of the ice-free conductor is less than or equal to the corona initiation field strength; If the first preset condition is met, the ultra-high voltage transmission line is de-iced using the corona effect.

2. The method according to claim 1, characterized in that The method further comprises: If the first preset condition is not met, the ultra-high voltage transmission line is modified to obtain a modified ultra-high voltage transmission line, so as to de-ice the modified ultra-high voltage transmission line by utilizing the corona effect.

3. The method according to claim 2, characterized in that The transformation of the ultra-high voltage transmission line includes any one or more of the following: Increase the number of conductor splits of the ultra-high voltage transmission line, reduce the conductor diameter of the ultra-high voltage transmission line, and increase the height of the conductor of the ultra-high voltage transmission line above the ground.

4. The method according to claim 1, characterized in that: The weather information includes: weather coefficient, atmospheric pressure and temperature information; the conductor type information includes sub-conductor radius and line type; Then, determining the corona initiation field strength of the ultra-high voltage transmission line based on the conductor type information and the weather information includes: Performing calculation based on the atmospheric pressure and the temperature information to determine relative air density; Based on the weather coefficient, determining the conductor surface roughness coefficient of the ultra-high voltage transmission line; The corona initiation field strength of the ultra-high voltage transmission line is determined by calculation based on the conductor surface roughness coefficient, the air relative density, the line type and the sub-conductor radius.

5. The method according to claim 1, characterized in that The line layout information includes: average height of the conductor above the ground, a first distance between the first conductor and the second conductor, and a second distance between virtual images of the first conductor and the second conductor; the conductor type information includes the radius of the split conductor circle, the number of conductor splits, and the radius of the sub-conductor; Based on the conductor type information and the line layout information, the maximum surface field strength of the ice-free conductor of the ultra-high voltage transmission line is determined, including: Based on the radius of the split conductor circle, the radius of the sub-conductor, the number of conductor splits, and the average height of the conductor above the ground, a potential coefficient matrix of the ultra-high voltage transmission line is calculated; Calculating based on the potential coefficient matrix to obtain a conductor charge matrix of the ultra-high voltage transmission line; Calculating based on the conductor charge matrix, the number of conductor splittings and the sub-conductor radius, to obtain the average field strength of the sub-conductors of the ultra-high voltage transmission line; The maximum surface field strength of the ice-free conductor of the ultra-high voltage transmission line is obtained by calculation based on the average field strength of the sub-conductors, the radius of the split conductor circle, and the number of conductor splits.

6. The method according to claim 1, characterized in that The method further comprises: obtaining a voltage level of the ultra-high voltage transmission line; Determining the corona inception voltage of the ultra-high voltage transmission line based on the conductor type and the line layout; Based on the voltage level and the corona inception voltage, determining whether the ultra-high voltage transmission line meets a second preset condition, wherein the second preset condition is that the voltage level is greater than or equal to the corona inception voltage; If the first preset condition is met, deicing the ultra-high voltage transmission line using the corona effect includes: If the first preset condition and the second preset condition are met, the ultra-high voltage transmission line is de-iced using the corona effect.

7. The method according to claim 1, characterized in that When the ultra-high voltage transmission line is an ultra-high voltage transmission line, the method further comprises: Obtaining radio interference information of the ultra-high voltage transmission line; Based on the radio interference information, determining whether the ultra-high voltage transmission line meets a third preset condition, wherein the third preset condition is that the radio interference information is less than or equal to a first threshold; If the first preset condition is met, the ultra-high voltage transmission line is de-iced by using the corona effect, including: if the first preset condition and the third preset condition are met, the ultra-high voltage transmission line is de-iced by using the corona effect.

8. The method according to claim 1, characterized in that When the ultra-high voltage transmission line is an ultra-high voltage transmission line, the method further comprises: Acquiring audible noise of the UHV transmission line; Based on the audible noise, determining whether the UHV transmission line meets a fourth preset condition, wherein the fourth preset condition is that the audible noise is less than or equal to a second threshold; If the first preset condition is met, deicing the ultra-high voltage transmission line by using the corona effect includes: If the first preset condition and the fourth preset condition are satisfied, the UHV power transmission line is de-iced using the corona effect.

9. A corona effect deicing device for ultra-high voltage transmission lines, characterized in that: include: An acquisition unit, used to acquire conductor type information of an ultra-high voltage transmission line, line layout information of an ultra-high voltage transmission line, and weather information; A determination unit, configured to determine the corona initiation field strength of the ultra-high voltage transmission line based on the conductor type information and the weather information; The determining unit is further used to determine the maximum surface field strength of the ice-free conductor of the ultra-high voltage transmission line based on the conductor type information and the line layout information; The determining unit is further used to determine whether the ultra-high voltage transmission line meets a first preset condition based on the corona initiation field strength and the maximum surface field strength of the ice-free conductor, wherein the first preset condition is that the maximum surface field strength of the ice-free conductor is less than or equal to the corona initiation field strength; A deicing unit is used to de-ice the ultra-high voltage transmission line by utilizing the corona effect if the first preset condition is met.

10. An ultra-high voltage transmission line corona effect deicing device, characterized in that: include: Memory for storing computer programs; A processor is used to execute the computer program stored in the memory to implement the steps of the corona effect deicing method for ultra-ultra-high voltage transmission lines as described in any one of claims 1 to 8.

Images