Radio interference calculation method and system for high-altitude high-voltage alternating-current transmission line

Abstract

The invention discloses a radio interference calculation method and system for a high-altitude high-voltage AC power transmission line, and the method comprises the steps: calculating the maximum field intensity of the surface of a wire based on the parameters of the wire of the power transmission line; calculating radio interference excitation functions under heavy rain conditions at different altitudes based on lead parameters, the maximum field intensity of the surface of the lead and an altitude correction factor; correcting the radio interference excitation function based on meteorological correction factors of different meteorological conditions, and determining radio interference excitation functions of different meteorological conditions; based on the radio interference excitation functions under different meteorological conditions, determining the radio interference current of each phase conductor through mode transformation; and obtaining the generated field based on the wireless interference current, and determining the radio interference of the high-altitude high-voltage alternating-current transmission line under different meteorological conditions.

Description

Technical Field

[0001] The present invention relates to the technical field of electromagnetic environment of power system, and more specifically, to a method and system for calculating radio interference of high-altitude high-voltage alternating current transmission lines. Background Art

[0002] With the rapid economic development and the need for clean energy development in the west, more and more ultra-high voltage AC transmission lines are being planned and constructed in high-altitude areas, with the highest voltage reaching 1000kV and the highest altitude exceeding 4000m. However, due to the lack of measured data on the electromagnetic environment of high-altitude transmission lines in China and the lack of many precedents for high-altitude line construction abroad, there is no mature and accurate prediction method for the electromagnetic environment of high-altitude AC transmission lines, especially radio interference. The radio interference prediction method proposed by my country through ultra-high voltage corona cage tests and long-term observations at low altitudes is only applicable to altitudes of 500m. At the same time, long-term observations of the electromagnetic environment of ultra-high voltage AC transmission lines in low-altitude areas show that the existing foreign high-voltage AC transmission line radio interference prediction accuracy is insufficient, and there has been no prediction method for high altitudes, especially above 3000m, that has been verified by actual measurements in the past.

[0003] In the face of the needs of high-altitude power grid construction, it is urgent to study and propose a more accurate method for calculating radio interference of high-altitude AC transmission lines. At the same time, traditional radio interference prediction methods are generally used to calculate the radio interference level under heavy rain conditions, and existing studies have shown that the difference between heavy rain and good weather is 16-25dB, or even larger. When designing lines above 750kV, the good weather limit of radio interference is a certain value rather than a range. Therefore, it is urgent to propose a certain prediction difference through long-term observation. At the same time, the weather types that can be calculated by traditional prediction models are relatively limited, and environmental complaints may occur in various weather conditions such as snow, fog, and haze. The existing prediction methods cannot evaluate the radio interference level in these weather conditions. It is urgent to propose a radio interference calculation for high-altitude high-voltage AC transmission lines that is suitable for various weather conditions to guide engineering design. Summary of the invention

[0004] The technical solution of the present invention provides a method and system for calculating radio interference of high-altitude high-voltage AC transmission lines to solve the problem of how to calculate radio interference of high-altitude high-voltage AC transmission lines.

[0005] In order to solve the above problems, the present invention provides a method for calculating radio interference of high-altitude high-voltage AC transmission lines, the method comprising:

[0006] Based on the conductor parameters of the transmission line, the maximum electric field strength on the conductor surface is calculated;

[0007] Based on the conductor parameters, the maximum field strength on the conductor surface and the altitude correction factor, the radio interference excitation function under heavy rain conditions at different altitudes is calculated;

[0008] The radio interference excitation function is corrected based on the meteorological correction factor of different meteorological conditions to determine the radio interference excitation function of different meteorological conditions;

[0009] Based on the radio interference excitation function under different meteorological conditions, the radio interference current of each phase conductor is determined through mode conversion;

[0010] Based on the fields generated by wireless interference current acquisition, the radio interference of high-altitude high-voltage AC transmission lines under different meteorological conditions is determined.

[0011] Preferably, the conductor parameters of the transmission line include: sub-conductor diameter d, number of conductor splits n, phase-to-phase distance and height above the ground.

[0012] Preferably, the calculation of the radio interference excitation function under heavy rain conditions at different altitudes based on the conductor parameters, the maximum field strength of the conductor and the altitude correction factor includes:

[0013] Sub-conductor diameter d, number of conductor splits n, maximum field strength on the conductor surface g max , the excitation function under heavy rain conditions at altitude H is:

[0014] Γ 大雨 =55-576.5 / g max +42.4lg(d)-0.714lg(n)+K H

[0015] Among them, K H is the altitude correction factor, which is calculated as:

[0016] H≤3500, K H =H / 300; 3500<H≤4300,K H =22.8(1-e (-H / 5000) )

[0017] The heavy rain condition is a rainfall rate of 7.6 mm / h or above.

[0018] Preferably, it also includes:

[0019] The excitation function of radio interference in good weather without rain, snow, fog or haze is:

[0020] Γ=Γ 大雨 -20.

[0021] Preferably, the meteorological correction factor based on different meteorological conditions is used to correct the radio interference excitation function to determine the radio interference excitation function under different meteorological conditions, including:

[0022] When the meteorological condition is heavy snowfall, the radio interference excitation function under heavy snowfall is the radio interference excitation function under heavy rain condition;

[0023] When the meteorological condition is haze weather, the radio interference excitation function under haze weather is the excitation function of radio interference under good weather plus 1dB;

[0024] When the meteorological condition is rainy or snowy weather with a rainfall rate of not less than 0.6 mm / h, the radio interference excitation function under rainy or snowy weather with a rainfall rate of not less than 0.6 mm / h is the radio interference excitation function under heavy rain conditions minus 5 dB;

[0025] When the meteorological condition is rainy weather with a rainfall rate less than 0.6 mm / h, the radio interference excitation function under rainy weather with a rainfall rate less than 0.6 mm / h is the radio interference excitation function under heavy rain conditions minus 12 dB.

[0026] Preferably, the diameter of the sub-conductor is 24-33.6 mm, the number of conductor splits is 4-8, the surface field strength of the conductor is 12-20 kV / cm, and the altitude is 0-4300 m.

[0027] Preferably, the calculating the maximum field strength on the conductor surface based on the conductor parameters of the transmission line includes:

[0028] The maximum field strength on the conductor surface is obtained based on the sub-conductor diameter, the number of conductor splits, the phase distance, and the height above the ground.

[0029] According to another aspect of the present invention, the present invention provides a high altitude high voltage AC transmission line radio interference calculation system, the system comprising:

[0030] A first calculation unit is used to calculate the maximum field strength on the conductor surface based on the conductor parameters of the transmission line;

[0031] A second calculation unit is used to calculate the radio interference excitation function under heavy rain conditions at different altitudes based on the conductor parameters, the maximum field strength on the conductor surface and the altitude correction factor;

[0032] A third calculation unit is used to correct the radio interference excitation function based on the meteorological correction factor of different meteorological conditions to determine the radio interference excitation function of different meteorological conditions;

[0033] A fourth calculation unit, used for determining the radio interference current of each phase conductor through mode conversion based on the radio interference excitation function of different meteorological conditions;

[0034] The fifth calculation unit is used to determine the radio interference of the high-altitude high-voltage AC transmission line under different meteorological conditions based on the field generated by the wireless interference current acquisition.

[0035] The technical solution of the present invention provides a method and system for calculating radio interference of high-altitude high-voltage AC transmission lines, wherein the method includes: calculating the maximum field strength on the surface of the conductor based on the conductor parameters of the transmission line; calculating the radio interference excitation function under heavy rain conditions at different altitudes based on the conductor parameters, the maximum field strength on the surface of the conductor and the altitude correction factor; correcting the radio interference excitation function based on the meteorological correction factor of different meteorological conditions to determine the radio interference excitation function of different meteorological conditions; determining the radio interference current of each phase conductor through mode conversion based on the radio interference excitation function of different meteorological conditions; determining the radio interference of high-altitude high-voltage AC transmission lines under different meteorological conditions based on the field generated by the wireless interference current. The technical solution of the present invention is applicable to the radio interference level of high-voltage AC transmission lines in high-altitude areas under various weather conditions, and can be applied to the conductor selection, line design and construction of high-altitude AC transmission lines to protect the plateau environment. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0037] Figure 1 A flow chart of a method for calculating radio interference of a high altitude high voltage AC transmission line according to a preferred embodiment of the present invention;

[0038] Figure 2 A flow chart of a method for calculating radio interference of a high altitude high voltage AC transmission line according to a preferred embodiment of the present invention;

[0039] Figure 3 A schematic diagram showing a comparison between the calculation results according to a preferred embodiment of the present invention and the actual values ​​of long-term observation of a high-altitude power transmission line; and

[0040] Figure 4 The structure diagram of a high altitude high voltage AC transmission line radio interference calculation system according to a preferred embodiment of the present invention. DETAILED DESCRIPTION

[0041] Now, exemplary embodiments of the present invention are described with reference to the accompanying drawings. However, the present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to disclose the present invention in detail and completely and to fully convey the scope of the present invention to those skilled in the art. The terms used in the exemplary embodiments shown in the accompanying drawings are not intended to limit the present invention. In the accompanying drawings, the same units / elements are marked with the same reference numerals.

[0042] Unless otherwise specified, the terms (including technical terms) used herein have the commonly understood meanings to those skilled in the art. In addition, it is understood that the terms defined in commonly used dictionaries should be understood to have the same meanings as those in the context of the relevant fields, and should not be understood as idealized or overly formal meanings.

[0043] Figure 1 The present invention is a flowchart of a method for calculating radio interference of a high-altitude high-voltage AC transmission line according to a preferred embodiment of the present invention.

[0044] Due to the lack of measured data of high-altitude AC transmission lines in my country in the past, the prediction of radio interference mainly adopts foreign methods. However, the foreign methods are based on limited altitude and conductor voltage, and the proposed altitude correction method is usually 1dB / 300m. At the same time, there are large differences in environmental climate at home and abroad. Studies have shown that altitude correction is not always linear. At the same time, compared with the long-term observation statistics of ultra-high voltage AC transmission lines, it is found that the accuracy of foreign prediction methods has large errors, and the radio interference prediction method recommended by my country's current standards is only applicable to an altitude of 500m. Although the existing technology has also proposed some radio interference prediction and altitude correction methods through corona cage tests, these methods have not been effectively verified by the actual high-altitude line statistical results. In order to meet environmental indicators in the actual prediction calculation of the project, a large calculation margin is often used, which will reduce the economic efficiency of the project to a certain extent. At the same time, the existing domestic and foreign prediction models are mainly used to calculate the radio interference value under single weather, generally heavy rain conditions, while my country's national standards stipulate the radio interference limit values ​​of 750kV and 1000kV AC transmission lines under good weather, making it difficult for the existing prediction models to directly correspond to the measured values. Long-term observations of high-altitude AC transmission lines show that the calculated difference of 18dB between heavy rain and good weather obtained from long-term observations at low altitudes is no longer applicable. Through corona cage tests and long-term tests at multiple high-altitude observation stations, the proposed radio interference calculation method is highly accurate and simple to implement, and can meet the needs of radio interference prediction and evaluation of high-altitude AC transmission lines in various weather conditions.

[0045] The present invention proposes a method for calculating radio interference of high-altitude high-voltage AC transmission lines, wherein the method includes: calculating the maximum field strength on the surface of the conductor according to line parameters and line voltage, including conductor diameter, number of splits, phase-to-phase distance, and height above the ground; using the line conductor diameter, number of splits, maximum field strength on the surface of the conductor, and altitude correction factor to calculate the radio interference excitation function under heavy rain conditions at different altitudes; using the weather correction factor to calculate the excitation function under other weather conditions; finally, using the excitation function under various weather conditions, through certain modulus conversion, the radio interference current of each phase conductor is obtained, and then the field generated by these currents is obtained, thereby obtaining the radio interference under different weather conditions. The above method can predict and evaluate the radio interference level of high-voltage AC transmission lines in high-altitude areas below 4,300 meters above sea level in various weather conditions. It can be used for conductor selection, line design and construction of high-altitude AC transmission lines to protect the plateau environment.

[0046] like Figure 1 As shown, the present invention provides a method for calculating radio interference of high-altitude high-voltage AC transmission lines, the method comprising:

[0047] Step 101: Calculate the maximum electric field strength on the conductor surface based on the conductor parameters of the transmission line;

[0048] Preferably, the maximum field strength on the conductor surface is calculated based on the conductor parameters of the transmission line, including:

[0049] The maximum field strength on the conductor surface is obtained based on the sub-conductor diameter, the number of conductor splits, the phase distance, and the height above the ground.

[0050] Preferably, the diameter of the sub-conductor is 24-33.6 mm, the number of conductor splits is 4-8, the surface field strength of the conductor is 12-20 kV / cm, and the altitude is 0-4300 m.

[0051] Preferably, the conductor parameters of the transmission line include: sub-conductor diameter d, number of conductor splits n, phase-to-phase distance and height above the ground.

[0052] Preferably, based on the conductor parameters, the maximum field strength of the conductor and the altitude correction factor, the radio interference excitation function under heavy rain conditions at different altitudes is calculated, including:

[0053] Sub-conductor diameter d, number of conductor splits n, maximum field strength on the conductor surface g max , the excitation function under heavy rain conditions at altitude H is:

[0054] Γ 大雨 =55-576.5 / g max +42.4lg(d)-0.714lg(n)+K H

[0055] Among them, K His the altitude correction factor, which is calculated as:

[0056] H≤3500, K H =H / 300; 3500<H≤4300,K H =22.8(1-e (-H / 5000) )

[0057] Heavy rain conditions are when the rainfall rate is above 7.6 mm / h.

[0058] Preferably, it also includes:

[0059] The excitation function of radio interference in good weather without rain, snow, fog or haze is:

[0060] Γ=Γ 大雨 -20.

[0061] The present invention is applicable to the case where the diameter of the sub-conductor is 24-33.6 mm, the number of conductor splits is 4-8, the surface field strength of the conductor is 12-20 kV / cm, and the altitude is 0-4300 m.

[0062] Step 102: Calculate the radio interference excitation function under heavy rain conditions at different altitudes based on the conductor parameters, the maximum field strength on the conductor surface, and the altitude correction factor;

[0063] Furthermore, the line parameters include the diameter of the sub-conductor d, the number of splits n, the maximum field strength on the conductor surface g max , the excitation function under heavy rain conditions at an altitude of H (in m) is:

[0064] Γ 大雨 =55-576.5 / g max +42.4lg(d)-0.714lg(n)+K H

[0065] In the formula, K H is the altitude correction factor, which is calculated as:

[0066] H≤3500, K H =H / 300; 3500<H≤4300,K H =22.8(1-e (-H / 5000) )

[0067] Furthermore, the excitation function of radio interference under good weather conditions is calculated as follows:

[0068] Γ=Γ 大雨 -20

[0069] That is, heavy rain minus 20dB to get the good weather level.

[0070] Step 103: Correcting the radio interference excitation function based on the meteorological correction factors of different meteorological conditions to determine the radio interference excitation functions of different meteorological conditions;

[0071] Other weather excitation functions of the present invention are calculated as follows: heavy snowfall directly uses the heavy rain value, haze is obtained by adding 1dB to good weather, rainy days above 0.6mm / h and heavy snow weather are obtained by subtracting 5dB from the heavy rain value, and light and moderate rain weather is obtained by subtracting 12dB from the heavy rain value.

[0072] Step 104: determining the radio interference current of each phase conductor through mode conversion based on the radio interference excitation function of different meteorological conditions;

[0073] Preferably, the radio interference excitation function is corrected based on the meteorological correction factor of different meteorological conditions to determine the radio interference excitation function of different meteorological conditions, including:

[0074] When the meteorological condition is heavy snowfall, the radio interference excitation function under heavy snowfall is the radio interference excitation function under heavy rain;

[0075] When the meteorological condition is foggy and haze weather, the radio interference excitation function under foggy and haze weather is the excitation function of radio interference under foggy and haze weather without rain, snow or haze weather plus 1dB;

[0076] When the meteorological conditions are rainy days or heavy snow with a rainfall rate of not less than 0.6mm / h, the radio interference excitation function under rainy days or heavy snow with a rainfall rate of not less than 0.6mm / h is the radio interference excitation function under heavy rain conditions minus 5dB;

[0077] When the meteorological condition is rainy weather with a rainfall rate less than 0.6 mm / h, the radio interference excitation function under rainy weather with a rainfall rate less than 0.6 mm / h is the radio interference excitation function under heavy rain conditions minus 12 dB.

[0078] Other weather excitation functions of the present invention are calculated as follows: heavy snowfall directly uses the heavy rain value, haze is obtained by adding 1dB to good weather, rainy days with a rainfall rate of more than 0.6mm / h and heavy snow weather are obtained by subtracting 5dB from the heavy rain value, and light rain weather is obtained by subtracting 12dB from the heavy rain value.

[0079] Step 105: Determine the radio interference of the high altitude high voltage AC transmission line under different meteorological conditions based on the field generated by the wireless interference current acquisition.

[0080] After obtaining the excitation function, the present invention only needs to perform certain mode conversion to obtain the radio interference current of each phase conductor, and then obtain the field generated by these currents, thereby obtaining the radio interference field strength. Substituting the excitation function of different weather conditions into the average value of radio interference under various weather conditions can be obtained.

[0081] Long-term observation of the line of the present invention shows that the average value of radio interference is substantially equivalent to the 50% value, and the above estimation method is equivalent to obtaining the 50% value of radio interference under various weather conditions.

[0082] Figure 2 The flowchart of a method for calculating radio interference of high-altitude high-voltage AC transmission lines is a specific embodiment of the present invention. Figure 2 As shown, the method mainly includes:

[0083] Step 1: First, calculate the maximum field strength g on the conductor surface based on the line parameters and line voltage, including conductor diameter, number of splits, phase distance, and height to the ground. max .

[0084] Step 2: Using the sub-conductor diameter d, the number of splits n and the maximum field strength gmax on the conductor surface, calculate the excitation function under heavy rain conditions at an altitude of H (in meters):

[0085] Γ 大雨 =55-576.5 / g max +42.4lg(d)-0.714lg(n)+K H

[0086] In the formula, K H is the altitude correction factor, which is calculated as:

[0087] H≤3500, K H =H / 300; 3500<H≤4300,K H =22.8(1-e (-H / 5000) )

[0088] Step 3: The excitation function of radio interference under good weather conditions is calculated as follows:

[0089] Γ=Γ 大雨 -20

[0090] That is, heavy rain minus 20dB to get the good weather level.

[0091] Step 4: Other weather excitation functions are calculated as follows: heavy snowfall is directly calculated using the heavy rain value, haze is calculated by adding 1dB to good weather, rainy days with a rainfall rate of more than 0.6mm / h and heavy snow are calculated by subtracting 5dB from the heavy rain value, and light and moderate rain is calculated by subtracting 12dB from the heavy rain value.

[0092] Step 5: After obtaining the excitation functions under various weather conditions, it is only necessary to obtain the radio interference current of each phase conductor through a certain modular transformation, and then obtain the field generated by these currents, and thus the radio interference field strength. Substituting the excitation functions of different weather conditions, the average value of radio interference under various weather conditions can be obtained.

[0093] In order to verify the effectiveness of the method for calculating radio interference of high-altitude AC high-voltage transmission lines provided by the present invention, the present invention calculates the radio interference of the 750kV Guanting Observation Station at an altitude of 1854m, the 750kV Gangcha Observation Station at an altitude of 3320m, and the 500kV Xiangcheng Observation Station at an altitude of 3950m, and compares them with the measured values ​​obtained by long-term observation statistics. The results are as follows: Figure 3 The CISPR formula in the figure uses an altitude correction factor of 1dB / 300m. The figure lists the comparison between the calculated values ​​and the measured values ​​under heavy rain and good weather. It can be seen from the figure that for the three high-altitude long-term observation stations, the calculated results in this paper are in good agreement with the measured values.

[0094] It should be noted here that long-term observations of the line show that the average value of radio interference is basically equivalent to the 50% value, and the above estimation method is equivalent to obtaining the 50% value of radio interference under various weather conditions. The calculation of the surface field strength of the conductor is relatively conventional and will not be described in detail here. The above method is applicable to sub-conductor diameters of 24-33.6mm, number of conductor splits of 4-8, conductor surface field strength of 12-20kV / cm, and altitude of 0-4300m. For AC transmission lines with larger conductor diameters, more splits and higher altitudes, due to the lack of actual line test results, its accuracy needs to be further verified, and the calculation results of this method can only be used as a reference.

[0095] Figure 4 The structure diagram of a high altitude high voltage AC transmission line radio interference calculation system according to a preferred embodiment of the present invention.

[0096] like Figure 4 As shown, the present invention provides a high altitude high voltage AC transmission line radio interference calculation system, the system comprising:

[0097] A first calculation unit 401 is used to calculate the maximum field strength on the conductor surface based on the conductor parameters of the transmission line;

[0098] Preferably, the maximum field strength on the conductor surface is calculated based on the conductor parameters of the transmission line, including:

[0099] The maximum field strength on the conductor surface is obtained based on the sub-conductor diameter, the number of conductor splits, the phase distance, and the height above the ground.

[0100] Preferably, the conductor parameters of the transmission line include: sub-conductor diameter d, number of conductor splits n, phase-to-phase distance and height above the ground.

[0101] Preferably, the diameter of the sub-conductor is 24-33.6 mm, the number of conductor splits is 4-8, the surface field strength of the conductor is 12-20 kV / cm, and the altitude is 0-4300 m.

[0102] The second calculation unit 402 is used to calculate the radio interference excitation function under heavy rain conditions at different altitudes based on the conductor parameters, the maximum field strength on the conductor surface and the altitude correction factor;

[0103] Preferably, based on the conductor parameters, the maximum field strength of the conductor and the altitude correction factor, the radio interference excitation function under heavy rain conditions at different altitudes is calculated, including:

[0104] Sub-conductor diameter d, number of conductor splits n, maximum field strength on the conductor surface g max , the excitation function under heavy rain conditions at altitude H is:

[0105] Γ 大雨 =55-576.5 / g max +42.4lg(d)-0.714lg(n)+K H

[0106] Among them, K H is the altitude correction factor, which is calculated as:

[0107] H≤3500, K H =H / 300; 3500<H≤4300,K H =22.8(1-e (-H / 5000) )

[0108] Heavy rain conditions are when the rainfall rate is above 7.6 mm / h.

[0109] The third calculation unit 403 is used to correct the radio interference excitation function based on the meteorological correction factor of different meteorological conditions to determine the radio interference excitation function of different meteorological conditions;

[0110] Preferably, the radio interference excitation function is corrected based on the meteorological correction factor of different meteorological conditions to determine the radio interference excitation function of different meteorological conditions, including:

[0111] When the meteorological condition is heavy snowfall, the radio interference excitation function under heavy snowfall is the radio interference excitation function under heavy rain;

[0112] When the meteorological condition is foggy and haze weather, the radio interference excitation function under foggy and haze weather is the excitation function of radio interference under foggy and haze weather without rain, snow or haze weather plus 1dB;

[0113] When the meteorological conditions are rainy days or heavy snow with a rainfall rate of not less than 0.6mm / h, the radio interference excitation function under rainy days or heavy snow with a rainfall rate of not less than 0.6mm / h is the radio interference excitation function under heavy rain conditions minus 5dB;

[0114] When the meteorological condition is rainy weather with a rainfall rate of not less than 0.6 mm / h, the radio interference excitation function under rainy weather with a rainfall rate of not less than 0.6 mm / h is the radio interference excitation function under heavy rain conditions minus 12 dB.

[0115] The fourth calculation unit 404 is used to determine the radio interference current of each phase conductor through mode conversion based on the radio interference excitation function of different meteorological conditions;

[0116] The fifth calculation unit 405 is used to determine the radio interference of the high-altitude high-voltage AC transmission line under different meteorological conditions based on the field generated by the wireless interference current acquisition.

[0117] Preferably, it also includes:

[0118] The excitation function of radio interference in the absence of rain, snow, fog and haze is:

[0119] Γ=Γ 大雨 -20.

[0120] A high-altitude high-voltage AC transmission line radio interference calculation system according to a preferred embodiment of the present invention corresponds to a high-altitude high-voltage AC transmission line radio interference calculation method according to another preferred embodiment of the present invention, and will not be described in detail here.

[0121] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Moreover, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes. The schemes in the embodiments of the present invention may be implemented in various computer languages, for example, object-oriented programming language Java and literal scripting language JavaScript, etc.

[0122] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0123] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0124] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0125] Although the preferred embodiments of the present invention have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention.

[0126] Obviously, those skilled in the art can make various changes and modifications to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is also intended to include these modifications and variations.

[0127] The invention has been described above with reference to a few embodiments. However, it is readily apparent to a person skilled in the art that other embodiments than the ones disclosed above are equally within the scope of the invention, as defined by the appended patent claims.

[0128] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the technical field, unless explicitly defined otherwise herein. All references to "a / said / the [means, components, etc.]" are to be openly interpreted as at least one instance of the means, components, etc., unless explicitly stated otherwise. The steps of any method disclosed herein do not necessarily have to be performed in the exact order disclosed, unless explicitly stated otherwise.

Claims

1. A method for calculating radio interference of high-altitude high-voltage AC transmission lines, the method comprising: Based on the conductor parameters of the transmission line, the maximum electric field strength on the conductor surface is calculated; Based on the conductor parameters, the maximum field strength on the conductor surface and the altitude correction factor, the radio interference excitation function under heavy rain conditions at different altitudes is calculated; The radio interference excitation function is corrected based on the meteorological correction factor of different meteorological conditions to determine the radio interference excitation function of different meteorological conditions; Based on the radio interference excitation function under different meteorological conditions, the radio interference current of each phase conductor is determined through mode conversion; Based on the fields generated by wireless interference current acquisition, the radio interference of high-altitude high-voltage AC transmission lines under different meteorological conditions is determined.

2. The method according to claim 1, wherein the conductor parameters of the transmission line include: The sub-conductor diameter d, the number of conductor splits n, the phase distance and the height above the ground.

3. The method according to claim 2, wherein the calculation of the radio interference excitation function under heavy rain conditions at different altitudes based on the conductor parameters, the maximum field strength of the conductor and the altitude correction factor comprises: Sub-conductor diameter d, number of conductor splits n, maximum field strength on the conductor surface g max , the excitation function under heavy rain conditions at altitude H is: Γ 大雨 =55-576.5 / g max +42.4lg(d)-0.714lg(n)+K H Among them, K H is the altitude correction factor, which is calculated as: H≤3500,K H =H / 300;3500<H≤4300,K H =22.8(1-e (-H / 5000) ) The heavy rain condition is a rainfall rate of 7.6 mm / h or more.

4. The method according to claim 3, further comprising: The excitation function of radio interference in good weather without rain, snow, fog or haze is: C=C 大雨 -20.

5. The method according to claim 4, wherein the radio interference excitation function is corrected based on the meteorological correction factor of different meteorological conditions to determine the radio interference excitation function of different meteorological conditions, comprising: When the meteorological condition is heavy snowfall, the radio interference excitation function under heavy snowfall is the radio interference excitation function under heavy rain condition; When the meteorological condition is haze weather, the radio interference excitation function under haze weather is the excitation function of radio interference under good weather plus 1dB; When the meteorological condition is rainy weather or heavy snow weather with a rainfall rate of not less than 0.6mm / h, the radio interference excitation function of the rainy day with a rainfall rate of not less than 0.6mm / h is the radio interference excitation function under heavy rain conditions minus 5dB; when the meteorological condition is rainy weather with a rainfall rate of less than 0.6mm / h, the radio interference excitation function of the rainy day with a rainfall rate of less than 0.6mm / h is the radio interference excitation function under heavy rain conditions minus 12dB.

6. The method according to claim 3, wherein the diameter of the sub-conductor is 24-33.6 mm, the number of conductor splits is 4-8, the surface field strength of the conductor is 12-20 kV / cm, and the altitude is 0-4300 m.

7. The method according to claim 3, wherein the step of calculating the maximum field strength on the conductor surface based on the conductor parameters of the transmission line comprises: The maximum field strength on the conductor surface is obtained based on the sub-conductor diameter, the number of conductor splits, the phase distance, and the height above the ground.

8. A high altitude high voltage AC transmission line radio interference calculation system, the system comprising: A first calculation unit is used to calculate the maximum field strength on the conductor surface based on the conductor parameters of the transmission line; A second calculation unit is used to calculate the radio interference excitation function under heavy rain conditions at different altitudes based on the conductor parameters, the maximum field strength on the conductor surface and the altitude correction factor; A third calculation unit, used to correct the radio interference excitation function based on the meteorological correction factor of different meteorological conditions, and determine the radio interference excitation function of different meteorological conditions; A fourth calculation unit, used for determining the radio interference current of each phase conductor through mode conversion based on the radio interference excitation function of different meteorological conditions; The fifth calculation unit is used to determine the radio interference of the high-altitude high-voltage AC transmission line under different meteorological conditions based on the field generated by the wireless interference current acquisition.

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