Method and system for determining long-term observation points of electromagnetic environment of AC transmission lines

Abstract

The present invention discloses a method and system for determining the long-term observation points of the electromagnetic environment of an AC transmission line, including: determining the target AC transmission line according to the maximum elevation and minimum elevation of the pole towers of the AC transmission line; screening the pole towers according to the gear distance, elevation difference and connecting angle between the pole towers of the target AC transmission line to determine the target pole tower; importing the position information of the target pole tower into a satellite map, and determining the long-term observation points of the electromagnetic environment at different altitudes based on the satellite map. The method of the present invention obtains the surrounding conditions of the line in detail and comprehensively through the satellite map, greatly reducing the time of on-site survey, reducing the intensity of work and the danger. The present invention can determine the positions of multiple observation points at different altitudes in a relatively short time, improve the selection efficiency, and can be applied to the construction and research of long-term observation stations for the electromagnetic environment in the field of AC power transmission and transformation engineering, with high promotion value and broad application prospects.

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 determining long-term observation points of the electromagnetic environment of an AC transmission line. Background Art

[0002] With the development of my country's economy and the use of clean energy, the construction of ultra-high and extra-high voltage transmission lines in high-altitude areas such as Tibet, Qinghai and Sichuan has gradually accelerated. As the altitude of AC transmission lines increases, the corona discharge of conductors increases. The audible noise and radio interference generated by corona discharge are greatly enhanced compared with the plains and low-altitude areas, and the electromagnetic environment is at risk of deterioration. After studying at an altitude of less than 3200m, foreign countries believe that the corona effects such as audible noise and radio interference increase by 1dB for every 300m increase in altitude. In the past, my country mainly adopted this correction method when designing high-altitude lines. However, in recent years, my country has found through corona cage and short line tests that the correction method is not accurate. The altitude effect is related to the surface field strength of the conductor, and there is a saturation trend with the increase of altitude. At present, the highest altitude of my country's 500kV lines has reached 5200m, which is much higher than the 3200m studied by foreign countries. At the same time, my country also plans to build ultra-high and extra-high voltage AC and DC lines in Sichuan, Tibet and other areas with an altitude of more than 5000m. There is an urgent need to obtain a more accurate altitude correction method to guide the optimization design of the project.

[0003] It is a scientific and technological means recognized at home and abroad to obtain the correction method of altitude effect by building observation stations for long-term testing of actual high-altitude transmission lines. my country has built a large number of 500kV and 750kV high-altitude transmission lines in Sichuan, Tibet and Qinghai, which have become an important basis for studying the impact of altitude. However, my country currently has no data accumulation of corona characteristics of high-altitude lines and lacks basic data support. It is urgent to build observation stations for research. However, the terrain in the high-altitude areas in the west is complex, the environment is harsh, and it is rarely visited. The conventional trekking and step-by-step tower search is not only time-consuming and laborious, but also extremely dangerous. Even if a relatively flat land is found, it is difficult to carry out long-term testing without houses and power supply, which cannot meet the urgent requirements of engineering applications.

[0004] At present, environmental protection usually only conducts electromagnetic environment tests on AC power transmission and transformation projects in good weather without rain or snow. The amount of data obtained through short-term tests is very small, which makes it difficult to fully reflect the electromagnetic environment characteristics and levels of power transmission projects, and it is even more impossible to obtain the correction method for the influence of line altitude. The altitude correction method obtained by long-term observation of audible noise and radio interference levels at different altitudes of the same line and statistical analysis is a widely recognized scientific and technological method. Long-term testing requires the construction of long-term observation stations. The traditional method of building observation stations requires checking the line conditions step by step and selecting ideal measurement points. However, high-altitude areas above 3,000 meters in Tibet, Qinghai and other places in my country are all distributed in mountains and sparsely populated areas. Many towers are even arranged above cliffs. The ultra-high and ultra-high voltage lines are hundreds or thousands of kilometers long. It is not only time-consuming and labor-intensive to search for towers step by step by manpower, but also extremely dangerous. Summary of the invention

[0005] The present invention provides a method and system for determining long-term observation points of the electromagnetic environment of an AC power transmission line, so as to solve the problem of how to accurately determine the long-term observation points of the electromagnetic environment.

[0006] In order to solve the above problem, according to one aspect of the present invention, a method for determining a long-term observation point of the electromagnetic environment of an AC transmission line is provided, the method comprising:

[0007] Determine the target AC transmission line according to the maximum elevation and minimum elevation of the AC transmission line tower;

[0008] Screen the towers according to the distance between towers, elevation difference and connection angle of the target AC transmission line to determine the target towers;

[0009] The location information of the target tower is imported into a satellite map, and based on the satellite map, long-term observation points of the electromagnetic environment at different altitudes are determined.

[0010] Preferably, the step of determining the target AC transmission line according to the maximum elevation and the minimum elevation of the tower of the AC transmission line comprises:

[0011] Acquire multiple AC transmission lines of the same voltage level in high altitude areas, calculate the difference between the maximum elevation and the minimum elevation of the tower of each transmission line, and select the AC transmission lines whose difference is greater than or equal to a preset elevation difference threshold as target AC transmission lines.

[0012] Preferably, the screening of towers according to the interval distance, elevation difference and connection angle between towers of the target AC transmission line to determine the target towers includes:

[0013] For the target AC transmission line, the towers whose inter-level distance between any two adjacent towers is less than or equal to the preset inter-level distance threshold, whose inter-tower elevation difference between any two connected towers is less than or equal to the preset inter-tower elevation difference threshold, and whose connecting line angle between any adjacent three-level towers is greater than or equal to the preset connecting line angle threshold are retained to determine the target towers.

[0014] Preferably, the method determines the distance between any two adjacent towers in the following manner, including:

[0015]

[0016] in, is the distance between the n-1th tower and the nth tower; x lng,n-1 is the longitude information of the n-1th tower; x lng,n is the longitude information of the nth tower; x lat,n-1 is the dimension information of the n-1th tower; x lat,n It is the dimension information of the nth tower; n is greater than or equal to 2.

[0017] Preferably, the method determines the angle between any two adjacent three-level towers in the following manner, including:

[0018]

[0019] Among them, θ n is the angle between the nth, n+1th and n+2th level towers; is the azimuth of the nth tower; is the azimuth of the n-1th tower; x lng,n-1 is the longitude information of the n-1th tower; x lng,n is the longitude information of the nth tower; x lat,n-1 is the dimension information of the n-1th tower; x lat,n It is the dimension information of the nth tower; n is greater than or equal to 2.

[0020] Preferably, the determining of long-term observation points of the electromagnetic environment at different altitudes based on the satellite map comprises:

[0021] Based on the satellite map, a location with a flat and open terrain within a first preset range in the middle of the line span where two-stage towers are connected in a straight line is selected, which is greater than or equal to a preset distance threshold from the end of the line, far away from line intersections and corners, far away from highways, railways and / or large factories, and to determine the location of the initial observation point;

[0022] Select an initial observation point where there are houses and no obstacles within the second preset range of the location of the initial observation point, and the height of the AC transmission line located thereto is within the preset area in the voltage level, as the intermediate observation point;

[0023] According to the line environment conditions, traffic convenience, land flatness, vegetation conditions and / or living convenience corresponding to the intermediate observation point corresponding to any altitude, an intermediate observation point is selected as the long-term observation point of the electromagnetic environment at any altitude.

[0024] Preferably, the method further comprises:

[0025] Audible noise and radio interference are tested within a third preset range of the location of the initial observation point and the transmission line to remove locations where external noise interference is greater than a preset interference threshold and where radio interference to a preset frequency exists.

[0026] According to another aspect of the present invention, a system for determining a long-term observation point of an electromagnetic environment of an AC transmission line is provided, the system comprising:

[0027] A target AC transmission line determination unit, used to determine the target AC transmission line according to the maximum elevation and the minimum elevation of the tower of the AC transmission line;

[0028] A target pole tower determination unit is used to screen the pole towers according to the interval distance, elevation difference and connection angle between the pole towers of the target AC transmission line to determine the target pole tower;

[0029] The long-term observation point determination unit is used to import the location information of the target tower into a satellite map, and determine the long-term observation points of the electromagnetic environment at different altitudes based on the satellite map.

[0030] Preferably, the target AC transmission line determination unit determines the target AC transmission line according to the maximum elevation and the minimum elevation of the tower of the AC transmission line, including:

[0031] Acquire multiple AC transmission lines of the same voltage level in high altitude areas, calculate the difference between the maximum elevation and the minimum elevation of the tower of each transmission line, and select the AC transmission lines whose difference is greater than or equal to a preset elevation difference threshold as target AC transmission lines.

[0032] Preferably, the target tower determination unit screens towers according to the interval distance, elevation difference and connection angle between towers of the target AC transmission line to determine the target tower, including:

[0033] For the target AC transmission line, the towers whose inter-level distance between any two adjacent towers is less than or equal to the preset inter-level distance threshold, whose inter-tower elevation difference between any two connected towers is less than or equal to the preset inter-tower elevation difference threshold, and whose connecting line angle between any adjacent three-level towers is greater than or equal to the preset connecting line angle threshold are retained to determine the target towers.

[0034] Preferably, the target tower determination unit determines the distance between any two adjacent towers in the following manner, including:

[0035]

[0036] in, is the distance between the n-1th tower and the nth tower; x lng,n-1 is the longitude information of the n-1th tower; x lng,n is the longitude information of the nth tower; x lat,n-1 is the dimension information of the n-1th tower; x lat,n It is the dimension information of the nth tower; n is greater than or equal to 2.

[0037] Preferably, the target tower determination unit determines the angle between any adjacent three-level towers in the following manner, including:

[0038]

[0039] Among them, θ n is the angle between the nth, n+1th and n+2th level towers; is the azimuth of the nth tower; is the azimuth of the n-1th tower; x lng,n-1 is the longitude information of the n-1th tower; x lng,n is the longitude information of the nth tower; x lat,n-1 is the dimension information of the n-1th tower; x lat,n It is the dimension information of the nth tower; n is greater than or equal to 2.

[0040] Preferably, the long-term observation point determination unit determines the long-term observation points of the electromagnetic environment at different altitudes based on the satellite map, including:

[0041] Based on the satellite map, a location with a flat and open terrain within a first preset range in the middle of the line span where two-stage towers are connected in a straight line is selected, which is greater than or equal to a preset distance threshold from the end of the line, far away from line intersections and corners, far away from highways, railways and / or large factories, and to determine the location of the initial observation point;

[0042] Select an initial observation point where there are houses and no obstacles within the second preset range of the location of the initial observation point, and the height of the AC transmission line located thereto is within the preset area in the voltage level, as the intermediate observation point;

[0043] According to the line environment conditions, traffic convenience, land flatness, vegetation conditions and / or living convenience corresponding to the intermediate observation point corresponding to any altitude, an intermediate observation point is selected as the long-term observation point of the electromagnetic environment at any altitude.

[0044] Preferably, the long-term observation point determination unit further comprises:

[0045] Audible noise and radio interference are tested within a third preset range of the location of the initial observation point and the transmission line to remove locations where external noise interference is greater than a preset interference threshold and where radio interference to a preset frequency exists.

[0046] The present invention provides a method and system for determining the long-term observation point of the electromagnetic environment of an AC transmission line, including: determining the target AC transmission line according to the maximum elevation and minimum elevation of the pole tower of the AC transmission line; screening the pole tower according to the gear distance, elevation difference and connection angle between the pole towers of the target AC transmission line to determine the target pole tower; importing the position information of the target pole tower into a satellite map, and determining the long-term observation point of the electromagnetic environment at different altitudes based on the satellite map. The method of the present invention determines the target pole tower by the elevation between the pole towers, the gear distance between the adjacent two-level pole towers and the connection angle between any adjacent three-level pole towers, and selects the long-term observation point based on the satellite map. The satellite map can be used to obtain the surrounding conditions of the line in detail and comprehensively, greatly reducing the time of on-site survey, reducing the work intensity and danger. The present invention can determine the positions of multiple observation points at different altitudes in a short time, improves the selection efficiency, and can be applied to the construction and research of long-term observation stations for electromagnetic environment in the field of AC power transmission and transformation engineering, with high promotion value and broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0047] A more complete understanding of exemplary embodiments of the present invention may be obtained by referring to the following drawings:

[0048] Figure 1 A flowchart of a method 100 for determining a long-term observation point of an electromagnetic environment of an AC power transmission line according to an embodiment of the present invention;

[0049] Figure 2 An exemplary diagram of a method for determining a long-term observation point of an electromagnetic environment of an AC power transmission line according to an embodiment of the present invention;

[0050] Figure 3 A schematic diagram of determining the surrounding conditions of a power transmission line based on a satellite map according to an embodiment of the present invention;

[0051] Figure 4 4 is a schematic diagram of the structure of a system 400 for determining long-term observation points of the electromagnetic environment of an AC transmission line according to an embodiment of the present invention. DETAILED DESCRIPTION

[0052] 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.

[0053] 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.

[0054] Figure 1 FIG. 1 is a flow chart of a method 100 for determining a long-term observation point of the electromagnetic environment of an AC power transmission line according to an embodiment of the present invention. Figure 1 Therefore, the method for determining the long-term observation point of the electromagnetic environment of the AC transmission line provided by the embodiment of the present invention determines the target tower through the elevation between the towers (i.e., the altitude), the distance between the adjacent two-level towers, and the angle between any adjacent three-level towers, and selects the long-term observation point based on the satellite map. The satellite map can be used to obtain the surrounding conditions of the line in detail and comprehensively, greatly reducing the time for on-site surveys, reducing the intensity of work and the danger. The present invention can determine the locations of multiple observation points at different altitudes in a short time, improve the selection efficiency, and can be applied to the construction and research of long-term observation stations for the electromagnetic environment in the field of AC power transmission and transformation engineering, with high promotion value and broad application prospects. The method 100 for determining the long-term observation point of the electromagnetic environment of the AC transmission line provided by the embodiment of the present invention starts from step 101. In step 101, the target AC transmission line is determined according to the maximum elevation and minimum elevation of the tower of the AC transmission line.

[0055] Preferably, the step of determining the target AC transmission line according to the maximum elevation and the minimum elevation of the tower of the AC transmission line comprises:

[0056] Acquire multiple AC transmission lines of the same voltage level in high altitude areas, calculate the difference between the maximum elevation and the minimum elevation of the tower of each transmission line, and select the AC transmission lines whose difference is greater than or equal to a preset elevation difference threshold as target AC transmission lines.

[0057] In the present invention, multiple AC transmission line paths of the same voltage level in high-altitude areas are obtained, and the difference between the maximum elevation and the minimum elevation of the tower of each transmission line is determined through the elevation of each level of towers, and the transmission line with the elevation difference greater than or equal to the preset elevation difference threshold of 1000m is selected as the target AC transmission line. Specifically, the path map or coordinate information of multiple AC transmission lines of the same voltage level in high-altitude areas is obtained, and the line voltage should be 220kV and above. The line path map is a satellite path map or table including the longitude and latitude of each level of towers. The elevation of each level of towers is obtained through the line satellite path map or GPS coordinate information, and the line with the height difference between the maximum elevation and the minimum elevation of the line is more than 1000m is selected.

[0058] In step 102, pole towers are screened according to the interval distance, elevation difference and connection angle between pole towers of the target AC transmission line to determine the target pole tower.

[0059] Preferably, the screening of towers according to the interval distance, elevation difference and connection angle between towers of the target AC transmission line to determine the target towers includes:

[0060] For the target AC transmission line, the towers whose inter-level distance between any two adjacent towers is less than or equal to the preset inter-level distance threshold, whose inter-tower elevation difference between any two connected towers is less than or equal to the preset inter-tower elevation difference threshold, and whose connecting line angle between any adjacent three-level towers is greater than or equal to the preset connecting line angle threshold are retained to determine the target towers.

[0061] Preferably, the method determines the distance between any two adjacent towers in the following manner, including:

[0062]

[0063] in, is the distance between the n-1th tower and the nth tower; x lng,n-1 is the longitude information of the n-1th tower; x lng,n is the longitude information of the nth tower; x lat,n-1 is the dimension information of the n-1th tower; x lat,n It is the dimension information of the nth tower; n is greater than or equal to 2.

[0064] Preferably, the method determines the angle between any two adjacent three-level towers in the following manner, including:

[0065]

[0066] Among them, θ nis the angle between the nth, n+1th and n+2th level towers; is the azimuth of the nth tower; is the azimuth of the n-1th tower; x lng,n-1 is the longitude information of the n-1th tower; x lng,n is the longitude information of the nth tower; x lat,n-1 is the dimension information of the n-1th tower; x lat,n It is the dimension information of the nth tower; n is greater than or equal to 2.

[0067] In the present invention, for any line, the pole tower coordinates of two adjacent pole towers connected in a straight line with a small distance between the poles and a small difference in altitude are screened out, and the screened pole tower coordinates are imported into the satellite map to determine the long-term observation point. Among them, by calculating the distance between the adjacent 2-level pole towers, the elevation difference between the adjacent 2-level pole towers and the angle of the adjacent 3-level pole towers on the same line, the pole tower coordinates of two adjacent pole towers connected in a straight line with a small distance between the poles and a small difference in altitude are obtained.

[0068] Specifically, for the same route with a height difference greater than 1000m, the distance between the adjacent two-level towers is subtracted and the absolute value is taken. For the absolute value greater than 50m, it is considered that the terrain is not flat enough and should be removed. For the same route with a height difference greater than 1000m, the angle of the connecting line of the adjacent three-level towers is calculated. If the angle of the connecting line is less than 170°, it is considered that the route has a corner at this point and should be removed. According to the above two conditions, some towers can be deleted, so as to obtain a straight line with flat terrain based on the remaining target towers.

[0069] In the present invention, the symbols and units are agreed upon. They include: X: the original tower information matrix, in degrees; X · : The selected tower information matrix, in degrees; x lat : latitude of point x, in degrees; x lng : longitude of point x, in degrees; x ele : Tower elevation information matrix, in km; Δ: span elevation difference matrix, in km; D: span distance matrix, in km; Az: span azimuth, from the north direction line, the angle between the current tower and the direction line of the next tower in a clockwise direction, in °; Θ: span angle matrix, in °; L: the spherical distance between two adjacent towers, in km; r: the average radius of the earth, taken as 6371.393km; θ: the angle between two adjacent spans, in °.

[0070] The process of determining the target tower includes:

[0071] 1) Select a line with n towers and input the location information matrix X of each tower, which includes the longitude and latitude data of the tower. The matrix X is expressed as:

[0072]

[0073] 2) Obtain the elevation information matrix x of each tower through the public map API interface ele , expressed as:

[0074]

[0075] 3) Obtain the elevation difference matrix △ between the line spans and the range of the tower elevation R ele :

[0076]

[0077] R ele =Max(x ele )-Min(x ele ),

[0078] 4) For R ele Lines shorter than 1 km are eliminated. ele Lines greater than or equal to 1 km.

[0079] 5) Further screening is performed on the selected lines. Using the tower position information matrix X, the spherical distance between adjacent towers (i.e., the distance between spans) is calculated by the Haversine method to obtain the span distance matrix D; the span azimuth Az and span angle matrix Θ are calculated by the spherical cosine formula. The matrices D, Az, and Θ are expressed as:

[0080]

[0081]

[0082]

[0083]

[0084]

[0085] 6) Since the span across the tower usually has a higher conductor height, the amplitude calibration of the ground electromagnetic environment data is not significant, so the part with a span distance greater than the preset span distance threshold of 1km is eliminated, that is, X is retained. 1 ={x m ∈X|d m ≤1}. For example, if the distance between tower m and tower m+1 is d mIf the tower is less than or equal to 1 km, then keep the tower m. m If it is greater than 1km, the tower m will be eliminated.

[0086] 7) Since the tower spans near mountains and hills usually have a higher elevation difference and the terrain is not flat enough, the terrain between the spans cannot meet the construction requirements of long-term observation station sites. Therefore, the part with the elevation difference between towers greater than the preset elevation difference threshold of 0.05 km between towers is removed, that is, X is retained. 2 ={x m ∈X|δ m ≤0.05}. For example, if the height difference between tower m and tower m+1 is δ m If δ is greater than 0.05 km, then remove the tower m. m If it is less than or equal to 0.05km, the tower m will be retained.

[0087] 8) As the electromagnetic environment data at the corner tower is different from the normal level, the part with the angle between the spans less than the preset connection angle threshold of 170° is eliminated, that is, X is retained. 3 ={x m ∈X|θ m ≥170}. For example, if the angle θ between the spans of tower m and tower m+1 is m If θ is less than 170°, then remove the tower m. m If it is greater than or equal to 170°, the tower m is retained.

[0088] 9) The final filtered tower information matrix X · for:

[0089] X′=X 1 ∩X 2 ∩X 3 .

[0090] In step 103, the location information of the target tower is imported into a satellite map, and based on the satellite map, long-term observation points of the electromagnetic environment at different altitudes are determined.

[0091] Preferably, the determining of long-term observation points of the electromagnetic environment at different altitudes based on the satellite map comprises:

[0092] Based on the satellite map, a location with a flat and open terrain within a first preset range in the middle of the line span where two-stage towers are connected in a straight line is selected, which is greater than or equal to a preset distance threshold from the end of the line, far away from line intersections and corners, far away from highways, railways and / or large factories, and to determine the location of the initial observation point;

[0093] Select an initial observation point where there are houses and no obstacles within the second preset range of the location of the initial observation point, and the height of the AC transmission line located thereto is within the preset area in the voltage level, as the intermediate observation point;

[0094] According to the line environment conditions, traffic convenience, land flatness, vegetation conditions and / or living convenience corresponding to the intermediate observation point corresponding to any altitude, an intermediate observation point is selected as the long-term observation point of the electromagnetic environment at any altitude.

[0095] Preferably, the method further comprises:

[0096] Audible noise and radio interference are tested within a third preset range of the location of the initial observation point and the transmission line to remove locations where external noise interference is greater than a preset interference threshold and where radio interference to a preset frequency exists.

[0097] In the present invention, after the target pole tower is determined, the coordinates of the selected target pole tower are imported into the satellite map to check the surrounding conditions of the line tower by tower. The line path map is imported into the satellite map, and the resolution of the satellite map should be high enough and the information should be rich enough, including the latitude and longitude of each point, elevation information, and map information such as towns, transportation, and houses.

[0098] When determining long-term observation points, first, start from the head substation in the satellite map, check the line conditions around the tower level by level to the terminal substation. The selected location should be more than 10 kilometers away from the end of the line, away from line intersections and corners, and away from highways, railways, and large factories. The location near the center of the line span connected by two straight towers where the terrain is flat and open and there are no other power lines should be marked; there should be houses near the marked location; then, obtain its elevation, longitude and latitude information and administrative divisions through satellite maps; then, determine the location based on the marked location elevation, the distance between the line and the house, and the traffic conditions. The positions that need to be observed are selected (i.e., the initial observation points); then, the positions that need to be observed are screened, and the positions that are close to the lines, have no tall trees or vegetation around them, are available and inhabited, and have normal power supply are selected to determine the intermediate observation points, where the height of the line to the ground at the selected point should be at a lower position in the voltage level; finally, the remaining intermediate observation points are screened according to different altitudes, and only one point is selected at the same altitude, and the long-term observation points are finally determined based on the environmental conditions around the lines, the degree of traffic convenience, the flatness of the land, the vegetation conditions, and the convenience of renting houses and land.

[0099] In addition, the house directly selected as the observation station should be less than 50m away from the phase conductor on the line. For houses far away from the line, a temporary house can be built near the line as an observation station.

[0100] In the present invention, before selecting houses and power transmission lines, it is also necessary to test audible noise and radio interference to eliminate locations where external noise interference is large and where there is radio station interference at 0.5MHz radio interference.

[0101] The present invention can not only exclude the vast majority of line locations that cannot be tested through satellite map search, but also obtain the surrounding conditions of the line in a more comprehensive and specific manner, and find key areas with flat and open terrain between the straight towers without the influence of the tension towers and the corner towers, and greatly reduce the workload of on-site surveys in these areas compared to full-line surveys. At the same time, during on-site surveys, key surveys can be conducted on areas that are not clearly marked on satellite maps, and locations where trees and vegetation have a high impact on the test can be removed, further improving efficiency. In addition, short-term testing can exclude areas with external interference, avoiding the embarrassment of finding that the measurement points are not ideal after the construction of the observation station, resulting in time-consuming and labor-intensive, unsatisfactory or even erroneous data.

[0102] In addition, satellite maps can be used to more quickly screen the altitudes of intended measurement points, and routes with small altitude differences can be directly excluded. At the same time, ideal measurement points at different altitudes can be better arranged.

[0103] The method for determining the long-term observation points of the electromagnetic environment of AC power transmission lines at different altitudes of the present invention obtains multiple AC power transmission line paths of the same voltage level in high-altitude areas, selects lines with an altitude difference greater than 1000m through the elevation and coordinate analysis of each level of pole towers, selects the pole tower coordinates of the line where two adjacent pole towers are connected in a straight line and the altitude difference is small, imports the selected pole tower coordinates into a satellite map, checks the surrounding conditions of the line tower by tower, selects the flat and open terrain around the line connected by two-level straight towers for marking, conducts on-site surveys on the marked positions, removes areas with large external interference through short-term tests, and finally determines the site of the long-term observation station by combining on-site power supply, housing, and altitude differences. By analyzing satellite and star maps through elevation coordinates to screen the measuring points, the labor intensity and danger of checking the lines step by step on-site in high-altitude areas with towering mountains can be greatly reduced, the measuring points with strong interference can be removed through short-term tests to better obtain the corona characteristics of the line itself, and the observation station can be built by using existing houses or power supply conditions to greatly speed up the operation time of the observation station and improve the measurement efficiency.

[0104] The following specifically illustrates the embodiments of the present invention.

[0105] like Figure 2 As shown, the method for determining the long-term observation point of the electromagnetic environment of the AC transmission line according to the embodiment of the present invention includes:

[0106] Step 1: Obtain the route map of multiple AC transmission lines of the same voltage level in high altitude areas or the longitude and latitude coordinates of each level of towers. The line voltage should be 220kV and above. The route map is a satellite route map or table including the longitude and latitude of each level of towers. You can choose the 500kV line of the Qinghai-Tibet and Sichuan-Tibet interconnection or the 750kV line of Qinghai and Gansu. The route map can be obtained from the power company or relevant power design institute.

[0107] Step 2: Through computer data processing, remove lines with small elevation differences, towers with corners between towers, and towers with large elevation differences between adjacent towers, and obtain preliminary screening points. The specific instructions are as follows:

[0108] 1) Select a route, input the GPS coordinates of each tower, and automatically obtain the elevation (i.e., altitude) of each tower through the GPS database.

[0109] 2) Obtain the maximum and minimum elevation values ​​of the line towers, and eliminate the lines with the maximum and minimum elevation difference less than 1000m. Select the lines with the elevation difference greater than 1000m.

[0110] 3) For the same line with an altitude difference greater than 1000m, the elevations between two adjacent towers are subtracted and the absolute value is taken. If the absolute value is greater than 50m, it is considered that the terrain is not flat enough and should be removed.

[0111] 4) For the same line with an altitude difference greater than 1000m, the angle of the connecting line of the adjacent three-level tower coordinates is calculated. If the angle of the connecting line is less than 170°, it is considered that the line has a corner at this location and should be eliminated.

[0112] 5) According to the above two conditions, the target towers are selected to obtain a straight line with flat terrain. Among them, by checking the satellite map step by step and removing the position where the straight tower and the tension tower are connected, the flat area where the straight towers are connected can be obtained.

[0113] Step 3: Based on the selected line towers, import the line route map into the satellite map, and check the surrounding conditions of the line tower by tower. Satellite maps can be selected from Google maps or other satellite maps. The resolution of the satellite map should be high enough and the information should be rich enough, including the latitude and longitude of each point, elevation information, and map information such as towns, transportation, and houses.

[0114] Step 4: Start from the head end substation and check the surrounding conditions of the line tower by tower on the satellite map (such as Figure 3The selected location should be more than 10 kilometers away from the end of the line, away from line intersections and corners, as well as away from highways, railways, and large factories. Check all the way to the terminal substation, except for the location where the straight tower is connected to the tension tower. For lines directly connected by two-level straight towers, select a location near the center of the line span where the terrain is flat and open and there are no other power lines for marking.

[0115] Step 5: There should be houses near the marked location so that the observatory can be powered. At the same time, its elevation, latitude and longitude information and administrative divisions can be obtained through satellite maps.

[0116] Step 6: Determine the locations that require special observation based on the marked location elevation, distance between the line and the house, and traffic conditions.

[0117] Step 7: Conduct on-site investigation and test line parameters at locations that require special observation. Select houses that are close to the lines, have no tall trees or vegetation around them, are available and inhabited, and have normal power supply. The height of the lines above the ground at the selected points should be relatively low in the voltage level; for example, the minimum height for 500kV and 750kV lines should be no higher than 20m and 30m, respectively.

[0118] Step 8: Test audible noise and radio interference near selected houses and power transmission lines, and remove locations where external noise interference is large and 0.5MHz radio interference is interfered by radio stations. The test time should be carried out during the day and at night, and the total time should be no less than 1 hour to obtain the A-weighted value of audible noise, 0.5MHz radio interference field strength, and spectrum distribution. According to the test results, remove locations where external noise interference is large and 0.5MHz radio interference is interfered by radio stations. For example, when it is close to a factory or a highway, there will be more noise interference at night. When 0.5MHz radio interference is interfered by radio stations, not only is the value large and does not decrease with increasing frequency, but it also fluctuates greatly back and forth. At the same time, when there is an obvious radio station in the receiver sound, these points need to be eliminated.

[0119] Step 9: For the remaining measuring points, select them according to their altitudes. Only one point is selected at the same altitude. The long-term observation point is finally determined based on the surrounding environment of the line, the degree of traffic convenience, the flatness of the land, the vegetation conditions, and the convenience of renting houses and land. There should be no tall trees around the selected measuring point. When land needs to be occupied for testing, a flatter and more open area should be selected as much as possible. At the same time, the economic crops planted on the land should not be too expensive to reduce crop damage and land acquisition costs. The house should be located where residents live and can provide simple care.

[0120] It should be noted that the distance between the house directly selected as the observation station and the phase conductor of the line should be less than 50m. For houses far away from the line, a temporary house can be built near the line as an observation station. The altitude difference between two adjacent altitude observation stations should be no less than 500m.

[0121] Figure 4 FIG. 4 is a schematic diagram of a system 400 for determining a long-term observation point of an electromagnetic environment of an AC power transmission line according to an embodiment of the present invention. Figure 4 As shown, a system 400 for determining long-term observation points of an electromagnetic environment of an AC transmission line provided by an embodiment of the present invention includes: a target AC transmission line determination unit 401 , a target tower determination unit 402 and a long-term observation point determination unit 403 .

[0122] Preferably, the target AC transmission line determining unit 401 is used to determine the target AC transmission line according to the maximum elevation and the minimum elevation of the tower of the AC transmission line.

[0123] Preferably, the target AC transmission line determining unit 401 determines the target AC transmission line according to the maximum elevation and the minimum elevation of the tower of the AC transmission line, including:

[0124] Acquire multiple AC transmission lines of the same voltage level in high altitude areas, calculate the difference between the maximum elevation and the minimum elevation of the tower of each transmission line, and select the AC transmission lines whose difference is greater than or equal to a preset elevation difference threshold as target AC transmission lines.

[0125] Preferably, the target pole tower determining unit 402 is used to screen the pole towers according to the interval distance, elevation difference and connection angle between the pole towers of the target AC transmission line to determine the target pole tower.

[0126] Preferably, the target tower determining unit 402 screens towers according to the interval distance, elevation difference and connection angle between towers of the target AC transmission line to determine the target tower, including:

[0127] For the target AC transmission line, towers whose inter-level distance between any two adjacent towers is less than or equal to the preset inter-level distance threshold and towers whose connecting angle between any adjacent three-level towers is greater than or equal to the preset connecting angle threshold are retained to determine the target tower.

[0128] Preferably, the target tower determination unit 402 determines the distance between any two adjacent towers in the following manner, including:

[0129]

[0130] in, is the distance between the n-1th tower and the nth tower; x lng,n-1 is the longitude information of the n-1th tower; x lng,n is the longitude information of the nth tower; x lat,n-1 is the dimension information of the n-1th tower; x lat,n It is the dimension information of the nth tower; n is greater than or equal to 2.

[0131] Preferably, the target tower determining unit 402 determines the angle between any adjacent three-level towers in the following manner, including:

[0132]

[0133] Among them, θ n is the angle between the nth, n+1th and n+2th level towers; is the azimuth of the nth tower; is the azimuth of the n-1th tower; x lng,n-1 is the longitude information of the n-1th tower; x lng,n is the longitude information of the nth tower; x lat,n-1 is the dimension information of the n-1th tower; x lat,n It is the dimension information of the nth tower; n is greater than or equal to 2.

[0134] Preferably, the long-term observation point determination unit 403 is used to import the location information of the target tower into a satellite map, and determine the long-term observation points of the electromagnetic environment at different altitudes based on the satellite map.

[0135] Preferably, the long-term observation point determination unit 403 determines the long-term observation points of the electromagnetic environment at different altitudes based on the satellite map, including:

[0136] Based on the satellite map, a location with a flat and open terrain within a first preset range in the middle of the line span where two-stage towers are connected in a straight line is selected, which is greater than or equal to a preset distance threshold from the end of the line, far away from line intersections and corners, far away from highways, railways and / or large factories, and to determine the location of the initial observation point;

[0137] Select an initial observation point where there are houses and no obstacles within the second preset range of the location of the initial observation point, and the height of the AC transmission line located thereto is within the preset area in the voltage level, as the intermediate observation point;

[0138] According to the line environment conditions, traffic convenience, land flatness, vegetation conditions and / or living convenience corresponding to the intermediate observation point corresponding to any altitude, an intermediate observation point is selected as the long-term observation point of the electromagnetic environment at any altitude.

[0139] Preferably, the long-term observation point determination unit 403 further includes:

[0140] Audible noise and radio interference are tested within a third preset range of the location of the initial observation point and the transmission line to remove locations where external noise interference is greater than a preset interference threshold and where radio interference to a preset frequency exists.

[0141] The system 400 for determining long-term observation points of the electromagnetic environment of an AC transmission line in an embodiment of the present invention corresponds to the method 100 for determining long-term observation points of the electromagnetic environment of an AC transmission line in another embodiment of the present invention, and will not be described in detail herein.

[0142] 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.

[0143] 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.

[0144] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0145] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes 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 generate 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.

[0146] 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.

[0147] 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 A step that specifies a function in one or more boxes.

[0148] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for determining long-term observation points of the electromagnetic environment of an AC transmission line, characterized in that: The method comprises: Determine the target AC transmission line according to the maximum elevation and minimum elevation of the AC transmission line tower; Screen the towers according to the distance between towers, elevation difference and connection angle of the target AC transmission line to determine the target towers; Importing the location information of the target tower into a satellite map, and determining long-term observation points of the electromagnetic environment at different altitudes based on the satellite map; Wherein, determining the target AC transmission line according to the maximum elevation and the minimum elevation of the tower of the AC transmission line includes: Acquire multiple AC transmission lines of the same voltage level in high altitude areas, calculate the difference between the maximum elevation and the minimum elevation of the tower of each transmission line, and select the AC transmission line whose difference is greater than or equal to a preset elevation difference threshold as the target AC transmission line; The screening of the towers according to the interval distance, elevation difference and connection angle between the towers of the target AC transmission line to determine the target towers includes: For the target AC transmission line, the towers whose inter-level distance between any two adjacent towers is less than or equal to the preset inter-level distance threshold, whose inter-tower elevation difference between any two connected towers is less than or equal to the preset inter-tower elevation difference threshold, and whose connecting line angle between any adjacent three-level towers is greater than or equal to the preset connecting line angle threshold are retained to determine the target towers; The method determines the distance between any two adjacent towers in the following manner, including: in, is the distance between the n-1th tower and the nth tower; x lng,n-1 is the longitude information of the n-1th tower; x lng,n is the longitude information of the nth tower; x lat,n-1 is the latitude information of the n-1th tower; x lat,n is the latitude information of the nth tower; n is greater than or equal to 2; The method determines the angle between any two adjacent three-level towers in the following manner: Among them, θ n is the angle between the nth, n+1th and n+2th level towers; is the azimuth of the nth tower; is the azimuth of the n-1th tower; x lng,n-1 is the longitude information of the n-1th tower; x lng,n is the longitude information of the nth tower; x lat,n-1 is the latitude information of the n-1th tower; x lat,n is the latitude information of the nth tower; n is greater than or equal to 2; Wherein, determining the long-term observation points of the electromagnetic environment at different altitudes based on the satellite map includes: Based on the satellite map, a location with a flat and open terrain within a first preset range in the middle of the line span where two-stage towers are connected in a straight line is selected, which is greater than or equal to a preset distance threshold from the end of the line, far away from line intersections and corners, far away from highways, railways and / or large factories, and to determine the location of the initial observation point; Select an initial observation point where there are houses and no obstacles within the second preset range of the location of the initial observation point, and the height of the AC transmission line located thereto is within the preset area in the voltage level, as the intermediate observation point; According to the line environment conditions, traffic convenience, land flatness, vegetation conditions and / or living convenience corresponding to the intermediate observation point corresponding to any altitude, an intermediate observation point is selected as the long-term observation point of the electromagnetic environment at any altitude.

2. The method according to claim 1, characterized in that: The method further comprises: Audible noise and radio interference are tested within a third preset range of the location of the initial observation point and the transmission line to remove locations where external noise interference is greater than a preset interference threshold and where radio interference to a preset frequency exists.

3. A system for determining long-term observation points of the electromagnetic environment of an AC transmission line, characterized in that: The system comprises: A target AC transmission line determination unit, used to determine the target AC transmission line according to the maximum elevation and the minimum elevation of the tower of the AC transmission line; A target pole tower determination unit is used to screen the pole towers according to the interval distance, elevation difference and connection angle between the pole towers of the target AC transmission line to determine the target pole tower; A long-term observation point determination unit, used for importing the location information of the target tower into a satellite map, and determining the long-term observation points of the electromagnetic environment at different altitudes based on the satellite map; The target AC transmission line determination unit determines the target AC transmission line according to the maximum elevation and the minimum elevation of the tower of the AC transmission line, including: Acquire multiple AC transmission lines of the same voltage level in high altitude areas, calculate the difference between the maximum elevation and the minimum elevation of the tower of each transmission line, and select the AC transmission line whose difference is greater than or equal to a preset elevation difference threshold as the target AC transmission line; The target tower determination unit screens the towers according to the interval distance, elevation difference and connection angle between the towers of the target AC transmission line to determine the target towers, including: For the target AC transmission line, the towers whose inter-level distance between any two adjacent towers is less than or equal to the preset inter-level distance threshold, whose inter-tower elevation difference between any two connected towers is less than or equal to the preset inter-tower elevation difference threshold, and whose connecting line angle between any adjacent three-level towers is greater than or equal to the preset connecting line angle threshold are retained to determine the target towers; The target tower determination unit determines the distance between any two adjacent towers in the following manner, including: in, is the distance between the n-1th tower and the nth tower; x lng,n-1 is the longitude information of the n-1th tower; x lng,n is the longitude information of the nth tower; x lat,n-1 is the latitude information of the n-1th tower; x lat,n is the latitude information of the nth tower; n is greater than or equal to 2; The target tower determination unit determines the angle between any adjacent three-level towers in the following manner, including: Among them, θ n is the angle between the nth, n+1th and n+2th level towers; is the azimuth of the nth tower; is the azimuth of the n-1th tower; x lng,n-1 is the longitude information of the n-1th tower; x lng,n is the longitude information of the nth tower; x lat,n-1 is the latitude information of the n-1th tower; x lat,n is the latitude information of the nth tower; n is greater than or equal to 2; The long-term observation point determination unit determines the long-term observation points of the electromagnetic environment at different altitudes based on the satellite map, including: Based on the satellite map, a location with a flat and open terrain within a first preset range in the middle of the line span where two-stage towers are connected in a straight line is selected, which is greater than or equal to a preset distance threshold from the end of the line, far away from line intersections and corners, far away from highways, railways and / or large factories, and to determine the location of the initial observation point; Select an initial observation point where there are houses and no obstacles within the second preset range of the location of the initial observation point, and the height of the AC transmission line located thereto is within the preset area in the voltage level, as the intermediate observation point; According to the line environment conditions, traffic convenience, land flatness, vegetation conditions and / or living convenience corresponding to the intermediate observation point corresponding to any altitude, an intermediate observation point is selected as the long-term observation point of the electromagnetic environment at any altitude.

4. The system according to claim 3, characterized in that The long-term observation point determination unit further includes: Audible noise and radio interference are tested within a third preset range of the location of the initial observation point and the transmission line to remove locations where external noise interference is greater than a preset interference threshold and where radio interference to a preset frequency exists.

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