Method and device for calculating radio interference of high-altitude ultrahigh-voltage alternating-current transmission line

Abstract

The invention discloses a radio interference calculation method and device for a high-altitude ultrahigh-voltage alternating-current transmission line. The method comprises the following steps: calculating to obtain the maximum field intensity of the surface of a wire according to the structural parameters and the operating voltage of a line; respectively calculating a rainy day radio interference excitation function and a good weather radio interference excitation function based on the maximum field intensity of the surface of the conductor, the structural parameters of the line and the meteorological parameters of the target area; calculating the radio interference current of each phase conductor through mode transformation according to the rainy day radio interference excitation function and the good weather radio interference excitation function; and according to the radio interference current, the radio interference levels of good weather and rainy days under the influence of different meteorological conditions are solved.

Description

Technical Field

[0001] This invention relates to the field of electromagnetic environment technology for power systems, and more specifically, to a method and apparatus for calculating radio interference of high-altitude ultra-high voltage AC transmission lines. Background Technology

[0002] As voltage increases, altitude rises, and relative air density decreases, the corona field strength of conductors decreases, making corona discharge more likely to occur. This results in significantly increased radio interference and audible noise compared to low-altitude plains. Radio interference has become one of the key environmental indicators for determining the conductor selection and arrangement of transmission lines in high-altitude areas. Currently, GB / T 15707-2017 "Radio Interference Limits for High-Voltage AC Overhead Transmission Lines" provides good weather conditions and double 80% values ​​(80% time, 80% confidence level) for radio interference. For the calculation of radio interference, the methods proposed by various countries through corona cage tests are mainly used to calculate radio interference under heavy rain conditions. There is a large range of variation between heavy rain and good weather. Studies by IEC / CISPR and others suggest that the difference between the two is 16-25 dB. Accurately calculating radio interference under good weather is extremely difficult. Some past studies have proposed taking the median value of 20.5 dB to calculate radio interference under good weather, but this method yields a fixed value with low accuracy. At the same time, since radio interference under rainy and good weather is closely related to local meteorological parameters and will change with various parameters such as rainfall rate, relative humidity, and air pressure, there is an urgent need to propose a method for calculating radio interference under high-altitude ultra-high voltage AC transmission lines to accurately assess their radio interference level in order to guide engineering design and environmental protection.

[0003] Due to the lack of measured data on high-altitude AC transmission lines in my country in the past, the prediction of radio interference mainly relied on methods proposed domestically and internationally through corona cage experiments. These methods are primarily suitable for calculating radio interference under heavy rain conditions, but they cannot account for the impact of changes in meteorological parameters such as rainfall rate on rainy days. Furthermore, they can only provide a range for radio interference in good weather, which varies greatly with air pressure, relative humidity, and temperature. Meanwhile, my country's radio interference control standards have already given limits for radio interference under 80% humidity and good weather conditions. Since past methods have difficulty accurately assessing the level of radio interference under the influence of different meteorological parameters, a large margin needs to be given in line design, which will affect the economic efficiency of line design. Summary of the Invention

[0004] To address the shortcomings of existing technologies, this invention provides a method and apparatus for calculating radio interference in high-altitude ultra-high voltage AC transmission lines.

[0005] According to one aspect of the present invention, a method for calculating radio interference of high-altitude ultra-high voltage AC transmission lines is provided, comprising:

[0006] The maximum electric field strength on the conductor surface is calculated based on the structural parameters and operating voltage of the line.

[0007] Based on the maximum electric field strength on the conductor surface, the structural parameters of the line, and the meteorological parameters of the target area, the radio interference excitation function in rainy weather and the radio interference excitation function in good weather are calculated respectively.

[0008] The radio interference excitation functions for rainy days and good weather are compared, and the radio interference excitation functions are used to calculate the radio interference current of each phase conductor through mode transformation.

[0009] Based on the radio interference current, the radio interference levels under different meteorological conditions are obtained for good weather and rainy days.

[0010] Optionally, the structural parameters of the line include the diameter of the sub-conductors, the number of splits, the phase-to-phase distance, and the height above ground; the operating voltage is the actual working voltage of the line.

[0011] Optionally, meteorological parameters include rainfall rate, air pressure, and wind speed; meteorological parameters used to calculate the good weather radio interference excitation function include air pressure, relative humidity, and temperature.

[0012] Optionally, the formula for calculating the excitation function of radio interference in rainy weather is:

[0013] Γ1=-3.168-576.5 / E+42.4lgd-0.714lgn+k h +4.28lg(RR+1)+17.886lgP+0.202W

[0014] In the formula, k h The altitude correction factor is calculated as follows:

[0015] H≤3500, k h =H / 300; 3500<H≤4300, k h =22.8(1-e (-H / 5000) )

[0016] In the formula, d is the diameter of the sub-conductor; E is the maximum electric field strength on the conductor surface; n is the number of splits; RR is the rainfall rate; P is the air pressure; and W is the wind speed.

[0017] Optionally, the formula for calculating the radio interference excitation function in good weather is:

[0018] Γ2=26.085-576.5 / E+42.4lg(d)-0.714lg(n)+k h +0.078RH +0.025T +0.006P

[0019] In the formula, k hThe altitude correction factor is calculated using the following formula:

[0020] H≤3500, k h =H / 300; 3500<H≤4300, k h =22.8(1-e (-H / 5000) )

[0021] In the formula, d is the diameter of the sub-conductor; E is the maximum electric field strength on the conductor surface; n is the number of splits; P is the air pressure; RH is the relative humidity; and T is the temperature.

[0022] Optionally, the method is applicable to ultra-high voltage AC transmission lines with an altitude below 4300 meters, a sub-conductor diameter of 24-33.6 mm, a split number of 4-8, and a conductor surface field strength of 12-20 kV / cm.

[0023] According to another aspect of the present invention, a radio interference calculation device for high-altitude ultra-high voltage AC transmission lines is provided, comprising:

[0024] The first calculation module is used to calculate the maximum electric field strength on the conductor surface based on the structural parameters of the line and the operating voltage.

[0025] The second calculation module is used to calculate the radio interference excitation function in rainy weather and the radio interference excitation function in good weather, based on the maximum electric field strength on the conductor surface, the structural parameters of the line and the meteorological parameters of the target area.

[0026] The third calculation module is used to calculate the radio interference current of each phase conductor by combining the radio interference excitation function in rainy weather and the radio interference excitation function in good weather through mode transformation.

[0027] The solution module is used to calculate the radio interference levels under different meteorological conditions, specifically good weather and rainy weather, based on the radio interference current.

[0028] According to another aspect of the present invention, a computer-readable storage medium is provided, the storage medium storing a computer program for performing the methods described in any of the above aspects of the present invention.

[0029] According to another aspect of the present invention, an electronic device is provided, the electronic device comprising: a processor; a memory for storing executable instructions of the processor; the processor being configured to read the executable instructions from the memory and execute the instructions to implement the method described in any of the preceding aspects of the present invention.

[0030] Therefore, based on the results of high-altitude ultra-high voltage corona cage tests and through the summary and induction of long-term radio interference observation data of four high-altitude ultra-high voltage AC transmission lines, this invention proposes a calculation method for radio interference of high-altitude high-voltage AC transmission lines under rainy and good weather conditions. This method is highly accurate, simple, and easy to implement, and can meet the needs of predicting and assessing radio interference of high-altitude AC transmission lines under good weather conditions. First, the maximum electric field strength on the conductor surface is calculated based on the line parameters and line voltage, including conductor diameter, number of phases, phase distance, and height above ground. Then, using the conductor diameter, number of phases, maximum electric field strength on the conductor surface, and the rainfall rate, air pressure, relative humidity, and temperature of the region, the radio interference excitation functions under rainy and good weather conditions are calculated respectively. Finally, the excitation functions are substituted into the formula, and through a certain mode transformation, the radio interference current of each phase conductor is obtained, thereby obtaining the field generated by these currents, and thus obtaining the radio interference level under rainy and good weather conditions affected by different meteorological parameters. Since the air pressure, temperature, and humidity of a region are relatively easy to obtain, the above method can be used to predict the radio interference level of ultra-high voltage AC transmission lines under rainy and good weather conditions under different meteorological parameters below an altitude of 4300m. Attached Figure Description

[0031] Exemplary embodiments of the present invention can be more fully understood by referring to the following figures:

[0032] Figure 1 This is a flowchart illustrating a method for calculating radio interference in high-altitude ultra-high voltage AC transmission lines, provided in an exemplary embodiment of the present invention.

[0033] Figure 2 This is a schematic diagram comparing measured and predicted values ​​under different humidity levels, provided by an exemplary embodiment of the present invention.

[0034] Figure 3 This is a residual diagram comparing the calculation results of the present invention with the long-term observed values ​​of high-altitude transmission lines, provided by an exemplary embodiment of the present invention.

[0035] Figure 4 This is a schematic diagram of the structure of a radio interference calculation device for high-altitude ultra-high voltage AC transmission lines provided in an exemplary embodiment of the present invention;

[0036] Figure 5 This is the structure of an electronic device provided in an exemplary embodiment of the present invention. Detailed Implementation

[0037] Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. It is obvious that the described embodiments are merely some embodiments of the present invention, and not all embodiments of the present invention, and it should be understood that the present invention is not limited to the exemplary embodiments described herein.

[0038] It should be noted that, unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of the invention.

[0039] Those skilled in the art will understand that the terms "first," "second," etc., in the embodiments of the present invention are only used to distinguish different steps, devices, or modules, and do not represent any specific technical meaning, nor do they indicate a necessary logical order between them.

[0040] It should also be understood that in the embodiments of the present invention, "multiple" can refer to two or more, and "at least one" can refer to one, two or more.

[0041] It should also be understood that any component, data or structure mentioned in the embodiments of the present invention can generally be understood as one or more unless explicitly defined or given contrary instructions in the context.

[0042] Furthermore, the term "and / or" in this invention is merely a description of the relationship between related objects, indicating that three relationships can exist. For example, A and / or B can represent: A existing alone, A and B existing simultaneously, or B existing alone. Additionally, the character " / " in this invention generally indicates that the preceding and following related objects have an "or" relationship.

[0043] It should also be understood that the description of the various embodiments in this invention emphasizes the differences between the various embodiments, and the similarities or similarities can be referred to each other. For the sake of brevity, they will not be described in detail.

[0044] At the same time, it should be understood that, for ease of description, the dimensions of the various parts shown in the accompanying drawings are not drawn according to actual scale.

[0045] The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit the invention or its application or use.

[0046] Techniques, methods, and equipment known to those skilled in the art may not be discussed in detail, but where appropriate, they should be considered part of the specification.

[0047] It should be noted that similar labels and letters in the following figures indicate similar items; therefore, once an item is defined in one figure, it does not need to be discussed further in subsequent figures.

[0048] The embodiments of this invention can be applied to electronic devices such as terminal devices, computer systems, and servers, and can operate together with a wide range of other general-purpose or special-purpose computing system environments or configurations. Well-known examples of terminal devices, computing systems, environments, and / or configurations suitable for use with electronic devices such as terminal devices, computer systems, and servers include, but are not limited to: personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network PCs, minicomputer systems, mainframe computer systems, and distributed cloud computing environments including any of the above systems, etc.

[0049] Electronic devices such as terminal devices, computer systems, and servers can be described in the general context of computer system executable instructions (such as program modules) executed by a computer system. Typically, program modules can include routines, programs, object programs, components, logic, data structures, etc., which perform specific tasks or implement specific abstract data types. Computer systems / servers can be implemented in distributed cloud computing environments, where tasks are executed by remote processing devices linked through communication networks. In distributed cloud computing environments, program modules can reside on local or remote computing system storage media, including storage devices.

[0050] Exemplary methods

[0051] Figure 1 This is a flowchart illustrating a method for calculating radio interference in high-altitude ultra-high-voltage AC transmission lines, provided by an exemplary embodiment of the present invention. This embodiment can be applied to electronic devices, such as... Figure 1 As shown, the method 100 for calculating radio interference of high-altitude ultra-high voltage AC transmission lines includes the following steps:

[0052] Step 101: Calculate the maximum electric field strength on the conductor surface based on the structural parameters and operating voltage of the line;

[0053] Step 102: Based on the maximum electric field strength on the conductor surface, the structural parameters of the line, and the meteorological parameters of the target area, calculate the radio interference excitation function in rainy weather and the radio interference excitation function in good weather, respectively.

[0054] Step 103: Calculate the radio interference current of each phase conductor by using the mode transformation between the radio interference excitation function for rainy weather and the radio interference excitation function for good weather.

[0055] Step 104: Based on the radio interference current, calculate the radio interference levels under different meteorological conditions for good weather and rainy days.

[0056] Specifically, to address the aforementioned problems, this invention proposes a method for calculating radio interference in high-altitude ultra-high voltage AC transmission lines. The method includes: first, calculating the maximum electric field strength on the conductor surface based on line parameters and voltage, including conductor diameter, number of phases, phase spacing, and height above ground; then, using the conductor diameter, number of phases, maximum electric field strength on the conductor surface, and the local rainfall rate, air pressure, relative humidity, and temperature, calculating the radio interference excitation functions under rainy and sunny weather conditions; finally, substituting the excitation functions into the formula and performing a mode transformation to obtain the radio interference current of each phase conductor, thereby obtaining the field generated by these currents and thus determining the radio interference levels under rainy and sunny weather conditions influenced by different meteorological parameters. Since air pressure, temperature, and humidity in a region are relatively easy to obtain, this method can predict the radio interference levels of ultra-high voltage AC transmission lines below 4300m in rainy and sunny weather conditions, thus enabling the selection of conductors and the design and construction of high-altitude AC transmission lines, protecting the plateau environment.

[0057] A method for calculating radio interference on high-altitude ultra-high voltage AC transmission lines. The method includes: first, calculating the maximum electric field strength on the conductor surface based on line parameters and voltage, including conductor diameter, number of phases, phase spacing, and height above ground; then, calculating the radio interference excitation functions under rainy and sunny weather conditions using the conductor diameter, number of phases, maximum electric field strength, and local rainfall rate, air pressure, relative humidity, and temperature; finally, substituting the excitation functions into the formula and performing a mode transformation to obtain the radio interference current of each phase conductor, thereby obtaining the field generated by these currents and thus the radio interference levels under different meteorological parameters. Since air pressure, temperature, and humidity in a region are relatively easy to obtain, for a fixed high-altitude point, air pressure changes are small, while temperature varies widely across seasons. Radio interference on rainy days is mainly affected by relative humidity, and radio interference under sunny weather conditions is also mainly affected by relative humidity. The calculation results can represent the average radio interference under different rainfall amounts on rainy days and the average radio interference under different relative humidity levels in sunny weather. The above method can be used to predict the radio interference level of ultra-high voltage AC transmission lines below 4300m altitude under rainy and good weather conditions.

[0058] Furthermore, the line parameters include the sub-conductor diameter d (in cm), the number of splits n, the maximum electric field strength E on the conductor surface (in kV / m), and the meteorological parameters include the rainfall rate RR (in mm / h), the air pressure P (in hpa), the wind speed W (in m / s), the relative humidity RH (in %), and the temperature T (in °C).

[0059] Furthermore, the excitation functions for radio interference under different rainfall amounts are as follows:

[0060] Γ1=-3.168-576.5 / E+42.4lgd-0.714lgn+k h +4.28lg(RR+1)+17.886lgP+0.202W

[0061] In the formula, k h The altitude correction factor is calculated as follows:

[0062] H≤3500, k h =H / 300; 3500<H≤4300, k h =22.8(1-e (-H / 5000) )

[0063] Furthermore, the radio interference excitation function under good weather conditions is:

[0064] Γ2=26.085-576.5 / E+42.4lg(d)-0.714lg(n)+k h +0.078RH +0.025T +0.006P

[0065] Furthermore, after obtaining the excitation function, the radio interference current of each phase conductor can be obtained through a certain mode transformation, thereby obtaining the field generated by these currents, and thus the radio interference field strength under rainy and good weather conditions. By substituting the temperature, humidity, and air pressure under different weather conditions, the radio interference level under the influence of various meteorological parameters can be obtained.

[0066] Furthermore, the method is applicable to conductors with a diameter of 24-33.6 mm, a conductor split number of 4-8, a conductor surface electric field strength of 12-20 kV / cm, and an altitude of 0-4300 m.

[0067] Furthermore, to verify the effectiveness of the proposed method for calculating radio interference on high-altitude AC high-voltage transmission lines under good weather conditions, radio interference at the 750kV Gangcha observation station (3320m altitude) was calculated under good weather conditions and compared with 390,000 sets of measured data obtained from a year of long-term observation. The results are as follows: Figure 2 and Figure 3 As shown in the figure, the residuals between the predicted average radio interference under different relative humidities in good weather and the measured values ​​using this method are distributed between -1.12 and 2.79 dB. The measured average radio interference in good weather is above 45.83 dB, with a relative error of -2.4% to 5.8%. The relative error of the prediction model is below 6%, achieving relatively accurate prediction.

[0068] It should be noted that long-term line observations show that the average radio interference is roughly equivalent to the 50% value, and the above estimation method is also equivalent to obtaining the 50% value of radio interference. The calculation of the conductor surface electric field strength is relatively conventional and will not be detailed here. The above method is applicable to conductor diameters of 24-33.6 mm, conductor split numbers of 4-8, conductor surface electric field strength of 12-20 kV / cm, and altitudes of 0-4300 m. For AC transmission lines with larger conductor diameters, more split numbers, and higher altitudes, due to the lack of actual line test results, its accuracy needs further verification, and the calculation results of this method can only be used as a reference.

[0069] Therefore, based on the results of high-altitude ultra-high voltage corona cage tests and through the summary and induction of long-term radio interference observation data of four high-altitude ultra-high voltage AC transmission lines, this invention proposes a calculation method for radio interference of high-altitude high-voltage AC transmission lines under rainy and good weather conditions. This method is highly accurate, simple, and easy to implement, and can meet the needs of predicting and assessing radio interference of high-altitude AC transmission lines under good weather conditions. First, the maximum electric field strength on the conductor surface is calculated based on the line parameters and line voltage, including conductor diameter, number of phases, phase distance, and height above ground. Then, using the conductor diameter, number of phases, maximum electric field strength on the conductor surface, and the rainfall rate, air pressure, relative humidity, and temperature of the region, the radio interference excitation functions under rainy and good weather conditions are calculated respectively. Finally, the excitation functions are substituted into the formula, and through a certain mode transformation, the radio interference current of each phase conductor is obtained, thereby obtaining the field generated by these currents, and thus obtaining the radio interference level under rainy and good weather conditions affected by different meteorological parameters. Since the air pressure, temperature, and humidity of a region are relatively easy to obtain, the above method can be used to predict the radio interference level of ultra-high voltage AC transmission lines under rainy and good weather conditions under different meteorological parameters below an altitude of 4300m.

[0070] Exemplary device

[0071] Figure 4 This is a schematic diagram of the structure of a radio interference calculation device for high-altitude ultra-high voltage AC transmission lines provided in an exemplary embodiment of the present invention. Figure 4 As shown, the device 400 includes:

[0072] The first calculation module 410 is used to calculate the maximum electric field strength on the surface of the conductor based on the structural parameters of the line and the operating voltage.

[0073] The second calculation module 420 is used to calculate the radio interference excitation function in rainy weather and the radio interference excitation function in good weather, based on the maximum electric field strength on the conductor surface, the structural parameters of the line and the meteorological parameters of the target area.

[0074] The third calculation module 430 is used to calculate the radio interference current of each phase conductor by combining the radio interference excitation function in rainy weather and the radio interference excitation function in good weather through mode transformation.

[0075] The solver module 440 is used to calculate the radio interference levels under different meteorological conditions, based on the radio interference current.

[0076] Optionally, the structural parameters of the line include the diameter of the sub-conductors, the number of splits, the phase-to-phase distance, and the height above ground; the operating voltage is the actual working voltage of the line.

[0077] Optionally, meteorological parameters include rainfall rate, air pressure, and wind speed; meteorological parameters used to calculate the good weather radio interference excitation function include air pressure, relative humidity, and temperature.

[0078] Optionally, the formula for calculating the excitation function of radio interference in rainy weather is:

[0079] Γ1=-3.168-576.5 / E+42.4lgd-0.714lgn+k h +4.28lg(RR+1)+17.886lgP+0.202W

[0080] In the formula, k h The altitude correction factor is calculated as follows:

[0081] H≤3500, k h =H / 300; 3500<H≤4300, k h =22.8(1-e (-H / 5000) )

[0082] In the formula, d is the diameter of the sub-conductor; E is the maximum electric field strength on the conductor surface; n is the number of splits; RR is the rainfall rate; P is the air pressure; and W is the wind speed.

[0083] Optionally, the formula for calculating the radio interference excitation function in good weather is:

[0084] Γ2=26.085-576.5 / E+42.4lg(d)-0.714lg(n)+k h +0.078RH +0.025T +0.006P

[0085] In the formula, k h The altitude correction factor is calculated using the following formula:

[0086] H≤3500, k h =H / 300; 3500<H≤4300, k h =22.8(1-e (-H / 5000) )

[0087] In the formula, d is the diameter of the sub-conductor; E is the maximum electric field strength on the conductor surface; n is the number of splits; P is the air pressure; RH is the relative humidity; and T is the temperature.

[0088] Optionally, the method is applicable to ultra-high voltage AC transmission lines with an altitude below 4300 meters, a sub-conductor diameter of 24-33.6 mm, a split number of 4-8, and a conductor surface field strength of 12-20 kV / cm.

[0089] Exemplary electronic devices

[0090] Figure 5 This is the structure of an electronic device provided in an exemplary embodiment of the present invention. For example... Figure 5 As shown, the electronic device 50 includes one or more processors 51 and memory 52.

[0091] The processor 51 may be a central processing unit (CPU) or other form of processing unit with data processing and / or instruction execution capabilities, and may control other components in the electronic device to perform desired functions.

[0092] The memory 52 may include one or more computer program products, which may include various forms of computer-readable storage media, such as volatile memory and / or non-volatile memory. The volatile memory may include, for example, random access memory (RAM) and / or cache memory. The non-volatile memory may include, for example, read-only memory (ROM), hard disk, flash memory, etc. One or more computer program instructions may be stored on the computer-readable storage medium, and the processor 51 may execute the program instructions to implement the methods of the software programs of the various embodiments of the present invention described above, and / or other desired functions. In one example, the electronic device may also include an input device 53 and an output device 54, these components being interconnected via a bus system and / or other forms of connection mechanisms (not shown).

[0093] In addition, the input device 53 may also include, for example, a keyboard, a mouse, etc.

[0094] The output device 54 can output various information to the outside. The output device 54 may include, for example, a display, a speaker, a printer, and a communication network and its connected remote output devices, etc.

[0095] Of course, for the sake of simplicity, Figure 5 Only some of the components of this electronic device relevant to the present invention are shown, omitting components such as buses, input / output interfaces, etc. In addition, the electronic device may include any other suitable components depending on the specific application.

[0096] Exemplary computer program products and computer-readable storage media

[0097] In addition to the methods and apparatus described above, embodiments of the present invention may also be computer program products, which include computer program instructions that, when executed by a processor, cause the processor to perform the steps of the methods according to various embodiments of the present invention described in the "Exemplary Methods" section above.

[0098] The computer program product can be written in any combination of one or more programming languages ​​to perform the operations of the embodiments of the present invention. The programming languages ​​include object-oriented programming languages ​​such as Java and C++, as well as conventional procedural programming languages ​​such as C or similar languages. The program code can be executed entirely on the user's computing device, partially on the user's computing device, as a standalone software package, partially on the user's computing device and partially on a remote computing device, or entirely on a remote computing device or server.

[0099] Furthermore, embodiments of the present invention may also be computer-readable storage media storing computer program instructions thereon, which, when executed by a processor, cause the processor to perform the steps of the methods according to various embodiments of the present invention described in the "Exemplary Methods" section above.

[0100] The computer-readable storage medium may be any combination of one or more readable media. A readable medium may be a readable signal medium or a readable storage medium. A readable storage medium may be, for example, an electrical, magnetic, optical, electromagnetic, infrared, or semiconductor system, device, or any combination thereof. More specific examples (a non-exhaustive list) of readable storage media include: an electrical connection having one or more wires, a portable disk, a hard disk, random access memory (RAM), read-only memory (ROM), erasable programmable read-only memory (EPROM or flash memory), optical fiber, portable compact disk read-only memory (CD-ROM), optical storage device, magnetic storage device, or any suitable combination thereof.

[0101] The basic principles of the present invention have been described above with reference to specific embodiments. However, it should be noted that the advantages, benefits, and effects mentioned in the present invention are merely examples and not limitations, and should not be considered as essential features of each embodiment of the present invention. Furthermore, the specific details disclosed above are for illustrative and facilitative purposes only, and are not limitations. These details do not limit the present invention to the necessity of employing the aforementioned specific details.

[0102] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For system embodiments, since they largely correspond to method embodiments, the description is relatively simple; relevant parts can be referred to the descriptions in the method embodiments.

[0103] The block diagrams of devices, systems, devices, and systems involved in this invention are merely illustrative examples and are not intended to require or imply that they must be connected, arranged, or configured in the manner shown in the block diagrams. As those skilled in the art will recognize, these devices, systems, devices, and systems can be connected, arranged, and configured in any manner. Words such as “comprising,” “including,” “having,” etc., are open-ended terms meaning “including but not limited to,” and are used interchangeably with them. The terms “or” and “and” as used herein refer to the terms “and / or,” and are used interchangeably with them unless the context clearly indicates otherwise. The term “such as” as used herein refers to the phrase “such as but not limited to,” and is used interchangeably with it.

[0104] The methods and systems of the present invention may be implemented in many ways. For example, they may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above-described order of steps for the methods is for illustrative purposes only, and the steps of the methods of the present invention are not limited to the order specifically described above unless otherwise specifically stated. Furthermore, in some embodiments, the present invention may also be implemented as a program recorded on a recording medium, the program comprising machine-readable instructions for implementing the methods according to the present invention. Thus, the present invention also covers recording media storing programs for performing the methods according to the present invention.

[0105] It should also be noted that in the systems, apparatus, and methods of the present invention, the components or steps can be disassembled and / or recombined. These disassemblies and / or recombinations should be considered equivalents of the present invention. The above description of the disclosed aspects is provided to enable any person skilled in the art to make or use the invention. Various modifications to these aspects will be readily apparent to those skilled in the art, and the general principles defined herein can be applied to other aspects without departing from the scope of the invention. Therefore, the invention is not intended to be limited to the aspects shown herein, but rather to be carried out within the widest scope consistent with the principles and novel features disclosed herein.

[0106] The above description has been given for purposes of illustration and description. Furthermore, this description is not intended to limit the embodiments of the invention to the forms disclosed herein. Although numerous exemplary aspects and embodiments have been discussed above, those skilled in the art will recognize certain variations, modifications, alterations, additions, and sub-combinations thereof.

Claims

1. A method for calculating radio interference of high altitude EHV AC transmission line, characterized by, The method comprises the steps of: calculating the maximum field strength on the surface of the conductor according to the structural parameters and the operating voltage of the line; calculating the radio interference excitation function in rainy days and the radio interference excitation function in fine weather respectively based on the maximum field strength on the surface of the conductor, the structural parameters of the line and the meteorological parameters of the target area; calculating the radio interference current of each phase conductor by mode transformation based on the radio interference excitation function in rainy days and the radio interference excitation function in fine weather; solving the radio interference levels in fine weather and in rainy days under the influence of different meteorological conditions according to the radio interference current.

2. The method of claim 1, wherein, The structural parameters of the line include the diameter of the sub-conductor, the number of sub-conductors, the distance between phases and the height above ground; the operating voltage is the actual working voltage of the line.

3. The method of claim 1, wherein, The meteorological parameters include the rainfall rate, the air pressure and the wind speed; the meteorological parameters on which the calculation of the radio interference excitation function in fine weather is based include the air pressure, the relative humidity and the temperature.

4. The method of claim 3, wherein, The calculation formula of the radio interference excitation function in rainy days is: Γ1 = -3.168 - 576.5 / E + 42.4 lg d - 0.714 lg n + k h + 4.28 lg (RR + 1) + 17.886 lg P + 0.202 W where k h is an altitude correction factor calculated as: H≤3500, k h = H / 300; 3500 < H≤4300, k h = 22.8(1 - e (-H / 5000) ) wherein d is the diameter of the sub-conductor, E is the maximum field strength on the surface of the conductor, n is the number of sub-conductors, RR is the rainfall rate, P is the air pressure and W is the wind speed. The calculation formula of the radio interference excitation function in fine weather is:

5. The method of claim 3, wherein, wherein d is the diameter of the sub-conductor, E is the maximum field strength on the surface of the conductor, n is the number of sub-conductors, P is the air pressure, RH is the relative humidity and T is the temperature. Γ2= 26.085 - 576.5 / E + 42.4 lg(d) - 0.714 lg(n) + k h + 0.078 RH + 0.025 T + 0.006 P where k h is an altitude correction factor, calculated as: H≤3500, k h = H / 300; 3500 < H≤4300, k h = 22.8(1 - e (-H / 5000) ) The method is applicable to the ultra-high voltage AC transmission line with an altitude of less than 4300 meters, a diameter of the sub-conductor of 24-33.6 mm, a number of sub-conductors of 4-8 and a conductor surface field strength of 12-20 kV / cm.

6. The method of claim 1, wherein, The method comprises the steps of:

7. A device for calculating radio interference of a high-altitude EHV AC transmission line, characterized by, a first calculation module for calculating the maximum field strength on the surface of the conductor according to the structural parameters and the operating voltage of the line; a second calculation module for calculating the radio interference excitation function in rainy days and the radio interference excitation function in fine weather respectively based on the maximum field strength on the surface of the conductor, the structural parameters of the line and the meteorological parameters of the target area; a third calculation module for calculating the radio interference current of each phase conductor by mode transformation based on the radio interference excitation function in rainy days and the radio interference excitation function in fine weather; a solving module for solving the radio interference levels in fine weather and in rainy days under the influence of different meteorological conditions according to the radio interference current. The structural parameters of the line include the diameter of the sub-conductor, the number of sub-conductors, the distance between phases and the height above ground; the operating voltage is the actual working voltage of the line.

8. The apparatus of claim 7, wherein, The meteorological parameters include the rainfall rate, the air pressure and the wind speed; the meteorological parameters on which the calculation of the radio interference excitation function in fine weather is based include the air pressure, the relative humidity and the temperature.

9. The apparatus of claim 7, wherein, The calculation formula of the radio interference excitation function in rainy days is:

10. The apparatus of claim 9, wherein, wherein d is the diameter of the sub-conductor, E is the maximum field strength on the surface of the conductor, n is the number of sub-conductors, RR is the rainfall rate, P is the air pressure and W is the wind speed. Y1 = -3.168 - 576.5 / E + 42.4lgd - 0.714lgn + k h + 4.28lg(RR+1) + 17.886lgP + 0.202W where k h is an altitude correction factor calculated as: H≤3500, k h = H / 300; 3500 < H≤4300, k h = 22.8(1 - e (-H / 5000) ) The calculation formula of the radio interference excitation function in fine weather is: wherein d is the diameter of the sub-conductor, E is the maximum field strength on the surface of the conductor, n is the number of sub-conductors, P is the air pressure, RH is the relative humidity and T is the temperature.

11. The apparatus of claim 9, wherein, The device is applicable to the ultra-high voltage AC transmission line with an altitude of less than 4300 meters, a diameter of the sub-conductor of 24-33.6 mm, a number of sub-conductors of 4-8 and a conductor surface field strength of 12-20 kV / cm. Γ2= 26.085 - 576.5 / E + 42.4 lg(d) - 0.714 lg(n) + k h + 0.078 RH + 0.025 T + 0.006 P where k h is an altitude correction factor, calculated as: H≤3500, k h = H / 300; 3500 < H≤4300, k h = 22.8(1 - e (-H / 5000) ) ​ 12. The apparatus of claim 7, wherein, ​ 13. A computer-readable storage medium, characterized in that, The storage medium stores a computer program for executing the method of any one of claims 1-6.

14. An electronic device, comprising: The electronic device comprises: a processor; a memory for storing executable instructions of the processor; the processor is configured to read the executable instructions from the memory and execute the instructions to implement the method of any one of claims 1-6.

Images