CN107844897A - A kind of power network mountain fire monitoring alarm shaft tower computational methods based on divide and conquer - Google Patents
A kind of power network mountain fire monitoring alarm shaft tower computational methods based on divide and conquer Download PDFInfo
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Abstract
The invention discloses a kind of power network mountain fire satellite monitoring based on divide and conquer to alert shaft tower computational methods, and this method comprises the steps：(1), transmission line tower coordinate tabular；(2) electric power line pole tower buffered data index, is established；(3), the doubtful influence shaft tower collection of fire point obtains；(4) power network mountain fire warning information is issued.The present invention is based on divide and conquer thinking, the buffered data concordance list of each shaft tower is established offline, the buffering shaft tower data acquisition system of nearest shaft tower is put by transferring fire, the collection of all doubtful early warning shaft towers can disposably be completed, the lookup to remaining a large amount of shaft tower is effectively avoided, early warning is spread for mountain fire and circuit mountain fire trip risk calculates and provides data supporting.This method clear thinking, easy to operate, calculating speed is fast, can be widely applied to power network mountain fire satellite monitoring early warning field.
Description
Technical Field
The invention belongs to the technical field of electric power engineering, and particularly relates to a power grid mountain fire satellite monitoring and alarming tower calculation method based on a divide and conquer thought.
Background
The tripping accident of the power transmission line is caused by the factors of fire customs, weather and the like in production and living, and when large-area mountain fire is easily exploded in continuous dry weather in spring seasons, clear seasons, autumn harvest and the like, the tripping accident of the power transmission line is caused, and the safety of a power grid is seriously threatened. The monitoring is carried out in the initial period of the forest fire of the power transmission line, the trip accident of the forest fire of the power transmission line can be effectively reduced, the social and property economic losses are reduced, and the method has great significance.
Traditional transmission line forest fire monitoring relies on artifical tour, and intensity of labour is big, and the field of vision is limited, the monitoring is untimely, and is efficient. In order to realize the large-range centralized monitoring of the mountain fire of the power transmission line, a power transmission line mountain fire monitoring system based on satellite remote sensing is adopted, and the mountain fire of a corridor of the power transmission line can be monitored in real time and the coordinate information of a fire point can be obtained. However, because the number of the transmission line towers is large, only the transmission line towers with 220kV and above of the power grid in the south of the lake can reach hundreds of thousands of levels, and when a large-range mountain fire occurs and the number of fire points reaches hundreds, traversing search is performed, time consumption for calculating the distance between the fire points and the transmission line is very long, and the monitoring and early warning efficiency of the mountain fire is seriously influenced.
Disclosure of Invention
In order to solve the problem that the existing power grid satellite mountain fire monitoring and alarming pole tower set is complex to calculate, the invention provides the power grid mountain fire monitoring and alarming pole tower calculation method based on the divide-and-conquer method, which considers that buffer pole tower indexes under different radiuses are established for each line pole tower off line, can avoid blind search for regional pole towers and overcomes the limitation of the existing method in calculation time.
In order to achieve the technical purpose, the technical scheme of the invention is that,
a power grid mountain fire monitoring and alarming pole tower calculation method based on a divide-and-conquer method comprises the following steps:
step one, tabulating coordinates of a power transmission line tower: arranging according to longitude and latitude coordinates from small to large to form a tower two-dimensional data table;
step two, establishing a transmission line tower buffer data index: according to the longitude and latitude of all the power transmission line towers, calculating a tower set which falls into a corresponding buffer area of each tower under different buffer radiuses;
step three, acquiring a tower set suspected of being influenced by fire points: and importing the coordinates of the fire points monitored by the satellites, and calculating a tower set closest to the fire points to serve as a suspected alarm tower set influenced by the fire points.
The method for calculating the power grid mountain fire monitoring and alarming tower based on the divide-and-conquer method comprises the following steps:
collecting longitude and latitude data of all transmission line towers in the area, and sequentially sorting and storing according to the longitude and latitude to form a tower two-dimensional data table [ lon 1 ,lon 2 ,…,lon N ][lat 1 ,lat 2 ,…,lat N ]Where lon represents the longitude value and lat represents the latitude value.
The second step of the power grid mountain fire monitoring and alarming pole tower calculation method based on the divide and conquer method comprises the following processes:
for all the transmission line towers, calculating tower number sets with the buffer radiuses of 1km, 2km and 3km falling into the buffer area in an off-line mode according to the longitude and latitude degrees to form tower buffer data indexes { P 1 ,P 2 ,P 3 In which P is 1 Representing the set of towers falling under the 1km buffer zone of the tower, P 2 Representing the set of towers falling under the 2km buffer zone of the tower, P 3 Representing the set of towers that fall under the 3km buffer for that tower.
According to the power grid mountain fire monitoring and alarming tower calculation method based on the divide-and-conquer method, a calculation formula of the distance between towers is as follows:
in the formula, R 0 Is the mean radius of the earth, R 0 ＝6371km；(x 0 ,y 0 ) For selecting the latitude and longitude coordinate values of the tower, (x) i ,y i ) And the latitude and longitude coordinate value of the tower number i in the buffer area is marked with an upper standard rad to convert the latitude into a radian form.
The third step of the power grid mountain fire monitoring and alarming pole tower calculation method based on the divide and conquer method comprises the following processes:
step 1, importing fire point coordinates (x ', y') monitored by a satellite, and performing longitude search on a two-dimensional data table by adopting a linear search method to find out two base towers (x ', y') closest to the fire point longitude value in positive and negative directions 1 ,y 1 ) And (x) 2 ,y 2 ) Satisfies max (x) 2 -x',x'-x 1 )<, 0.03 degree and max (| y) 1 -y'|,|y'-y 2 |)<0.03°；
Step 2, performing latitude search on the two-dimensional data table by adopting a linear search method to find out two base towers (x) with the latitude values closest to the fire point in positive and negative 3 ,y 3 ) And (x) 4 ,y 4 ) Satisfies max (y) 4 -y',y'-y 3 )<, 0.03 degree and max (| x) 4 -x'|,|x'-x 3 |)<0.03°；
Step 3, calculating the respective distances d between the 4-base adjacent tower and the fire point according to the formula (1) i And judging the called data index table:
if d is i If the number of the tower frames is less than 1km, calling a buffer data index table P under the tower frame with the number of 3km 3 ；
If d is less than or equal to 1km i If the number is less than 2km, calling a buffer data index table P under the tower for 2km 2 ；
If d is less than or equal to 2km i If the number of the tower frames is less than 3km, calling a buffer data index table P under the tower frame with the number of 1km 1 ；
If d is i >, 3km, no influence on the rod tower set;
and 4, integrating 4-base adjacent towers and tower sets in the buffer data index table thereof, removing repeated towers, and forming a tower set suspected of being influenced by fire points.
The power grid mountain fire monitoring and alarming pole tower calculation method based on the divide-and-conquer method further comprises the following step four of issuing power grid mountain fire alarming information: calculating the distance d between the fire point and the suspected tower set, and issuing power grid mountain fire alarm information according to the distance d:
if d is less than 1km, the tower is a power grid mountain fire first-level early warning tower;
if d is more than or equal to 1km and less than 2km, the tower is a power grid mountain fire secondary early warning tower;
and if d is more than or equal to 2km and less than 3km, the tower is a power grid mountain fire three-level early warning tower.
The beneficial effects of the invention are: the invention provides a power grid mountain fire monitoring and warning tower calculation method based on a dividing and treating thought, wherein a buffer data index table of each tower is established off line, and the collection of all suspected early warning towers can be completed at one time by taking a buffer tower data set of the tower closest to a fire point, so that the searching of a large number of other towers is effectively avoided, the system processing efficiency is greatly improved, and support is provided for mountain fire spreading early warning and line mountain fire tripping risk calculation.
Drawings
Fig. 1 is a schematic diagram of power grid mountain fire alarm tower calculation based on a buffer index table.
Detailed Description
The invention relates to a transmission line buffer tower off-line calculation method based on a divide-and-conquer method, which is characterized in that a linear search strategy is utilized to calculate the tower number closest to the longitude and latitude of a fire point, the collection of all suspected early warning towers is completed at one time by extracting the buffer tower index table of the closest tower, and mountain fire warning information is issued based on the calculation result of the distance from the fire point to each tower, so that data support is provided for mountain fire spreading early warning and line mountain fire tripping risk calculation.
The method of the present invention is described in the following supplementary descriptions with reference to practical operation examples, and the specific implementation steps are as follows:
step 1: and (5) tabulating the coordinates of the transmission line tower. Collecting all the transmission line tower data in the area, and sequentially sorting and storing according to the longitude and latitude to form a tower two-dimensional data table [ lon 1 ,lon 2 ,…,lon N ][lat 1 ,lat 2 ,…,lat N ](lon represents longitude value, lat represents latitude value), stored in the system database.
Step 2: and establishing a transmission line tower buffer data index. For all the electric transmission line towers, tower number sets with the buffering radiuses of 1km, 2km and 3km falling into the buffer area are calculated off line according to the longitude and latitude of the electric transmission line towers to form tower buffering data indexes { P } 1 ,P 2 ,P 3 }(P 1 Representing the set of towers falling under the 1km buffer zone of the tower, P 2 Representing the set of towers falling under the 2km buffer zone of the tower, P 3 Representing the set of towers that fall under the 3km buffer for that tower). The distance calculation formula between towers is as follows:
in the formula, R 0 Is the mean radius of the earth, R 0 ＝6371km；(x 0 ,y 0 ) For selecting the latitude and longitude coordinate values of the tower, (x) i ,y i ) And D, converting the latitude into a radian form by the upper standard rad, wherein the latitude and longitude coordinate values are the tower numbers i in the buffer area.
And step 3: the fire point is suspected to influence the acquisition of the tower set. Leading in the coordinates (x ', y') of the fire point monitored by the satellite, calculating a suspected alarm tower set influenced by the fire point, and executing the following steps:
(3.1) carrying out longitude search on the two-dimensional data table in the step (1) by adopting a linear search method, and finding out two base towers (x) with the most positive and negative fire point longitude values 1 ,y 1 ) And (x) 2 ,y 2 ) Satisfies max (x) 2 -x',x'-x 1 )<, 0.03 degree and max (| y) 1 -y'|,|y'-y 2 |)<0.03°。
(3.2) performing latitude search on the two-dimensional data table in the step (1) by adopting a linear search method, and finding out two base towers (x) with the latitude values which are closest to the fire point in positive and negative 3 ,y 3 ) And (x) 4 ,y 4 ) Satisfies max (y) 4 -y',y'-y 3 )<, 0.03 degree and max (| x) 4 -x'|,|x'-x 3 |)<0.03°。
(3.3) calculating the respective distances d between the 4-base adjacent tower and the fire point according to the formula (1) i And judging the called data index table:
if d is i If the number of the tower frames is less than 1km, calling a buffer data index table P under the tower frame with the number of 3km 3 ；
If d is less than or equal to 1km i If the number is less than 2km, calling a buffer data index table P under the tower for 2km 2 ；
If d is less than or equal to 2km i If the number of the tower frames is less than 3km, calling a buffer data index table P under the tower frame with the number of 1km 1 ；
If d is i >, 3km, no influence on the rod tower set;
and (3.4) integrating 4-base adjacent towers and tower sets in the buffer data index table thereof, removing repeated towers, and forming a tower set suspected of being influenced by fire points.
And 4, step 4: and issuing power grid forest fire alarm information. Calculating the distance d between the fire point and the suspected tower set, and issuing power grid mountain fire alarm information:
if d is less than 1km, the tower is a power grid mountain fire first-level early warning tower;
if d is more than or equal to 1km and less than 2km, the tower is a power grid mountain fire secondary early warning tower;
if d is more than or equal to 2km and less than 3km, the tower is a power grid mountain fire three-level early warning tower;
in this embodiment, the satellite receives fire longitude 110.942 and latitude 28.585.
First, adjacent towers with the shortest fire point longitude and latitude distances are determined through linear search, namely 1444# and 1445# towers of a certain +/-800 kV line A, and the longitude and latitude of the towers are respectively (110.937, 28.561) and (110.944, 28.567).
Then, according to the formula (1), the distances d are obtained 1 ＝1103.9m，d 2 ＝749.2m。
And then looking up a tower set in a 1444# tower 2km buffer index table and a 1445# tower 3km buffer index table. Wherein the 1444# tower 2km buffer index table comprises 1442#, 1443#, 1445#, 1446#, 1447# of the line A and 2302# and 2303# of a 500kV line B; the 1445# tower 3km buffer index table contains 1442#, 1443#, 1444#, 1446#, 1447#, 1448# of the line A and 2303#, 2304# and 2305# of a certain 500kV line B.
And finally, calculating the distance between the fire point and each tower in the buffer index table to obtain 1444# (secondary early warning), 1445# (primary early warning), 1446# (tertiary early warning) and 2303# (secondary early warning) of the line A with the early warning tower of +/-800 kV and the line B with the 500 kV. The information can provide support for mountain fire spreading tower early warning and line mountain fire tripping risk calculation.
Claims (6)
1. A power grid mountain fire monitoring and alarming pole tower calculation method based on a divide-and-conquer method is characterized by comprising the following steps:
step one, tabulating coordinates of a power transmission line tower: arranging according to the longitude and latitude coordinates from small to large to form a tower two-dimensional data table;
step two, establishing a transmission line tower buffer data index: according to the longitude and latitude of all the power transmission line towers, calculating a tower set which falls into a corresponding buffer area of each tower under different buffer radiuses;
step three, acquiring a tower set suspected of being influenced by fire points: and importing the coordinates of the fire points monitored by the satellites, and calculating a tower set closest to the fire points to serve as a suspected alarm tower set influenced by the fire points.
2. The power grid forest fire monitoring and alarming tower calculation method based on the divide-and-conquer method as claimed in claim 1, wherein the first step comprises the following processes:
collecting longitude and latitude data of all transmission line towers in the area, and sequentially sorting and storing according to the longitude and latitude to form a tower two-dimensional data table [ lon 1 ,lon 2 ,…,lon N ][lat 1 ,lat 2 ,…,lat N ]Where lon represents the longitude value and lat represents the latitude value.
3. The power grid mountain fire monitoring and alarming tower calculation method based on the divide and conquer method as claimed in claim 1, wherein the second step comprises the following processes:
for all the transmission line towers, calculating tower number sets with the buffer radiuses of 1km, 2km and 3km falling into the buffer area in an off-line mode according to the longitude and latitude degrees to form tower buffer data indexes { P 1 ,P 2 ,P 3 In which P is 1 Representing the set of towers falling under the 1km buffer zone of the tower, P 2 Representing the set of towers falling under the 2km buffer zone of the tower, P 3 Representing the set of towers that fall under the 3km buffer for that tower.
4. The power grid forest fire monitoring and alarming tower calculation method based on the divide-and-conquer method as claimed in claim 3, wherein the calculation formula of the distance between towers is as follows:
in the formula, R 0 Is the mean radius of the earth, R 0 ＝6371km；(x 0 ,y 0 ) For selecting the latitude and longitude coordinate values of the tower, (x) i ,y i ) And the latitude and longitude coordinate value of the tower number i in the buffer area is marked with an upper standard rad to convert the latitude into a radian form.
5. The power grid forest fire monitoring and alarming tower calculation method based on the divide-and-conquer method as claimed in claim 4, wherein the third step comprises the following processes:
step 1, importing fire point coordinates (x ', y') monitored by a satellite, and performing longitude search on a two-dimensional data table by adopting a linear search method to find out two base towers (x ', y') closest to the fire point longitude value in positive and negative directions 1 ,y 1 ) And (x) 2 ,y 2 ) Satisfies max (x) 2 -x',x'-x 1 )<, 0.03 degree and max (| y) 1 -y'|,|y'-y 2 |)<0.03°；
Step 2, carrying out latitude search on the two-dimensional data table by adopting a linear search method, and finding out two base towers (x) with the latitude values which are closest to the fire point in positive and negative 3 ,y 3 ) And (x) 4 ,y 4 ) Satisfies max (y) 4 -y',y'-y 3 )<, 0.03 degree and max (| x) 4 -x'|,|x'-x 3 |)<0.03°；
Step 3, calculating the respective distances d between the 4-base adjacent tower and the fire point according to the formula (1) i And judging the called data index table:
if d is i Less than 1km, calling a buffer data index table P under the tower for 3km 3 ；
If d is less than or equal to 1km i If the number is less than 2km, calling a buffer data index table P under the tower for 2km 2 ；
If d is less than or equal to 2km i If the number of the tower frames is less than 3km, calling a buffer data index table P under the tower frame with the number of 1km 1 ；
If d is i >, 3km, no influence on the pole tower set;
and 4, integrating 4-base adjacent towers and tower sets in the buffer data index table thereof, removing repeated towers, and forming a tower set suspected of being influenced by fire points.
6. The power grid forest fire monitoring and alarming tower calculation method based on the divide-and-conquer method as claimed in claim 1, further comprising the fourth step of issuing power grid forest fire alarming information: calculating the distance d between the fire point and the suspected tower set, and issuing power grid mountain fire alarm information according to the distance d:
if d is less than 1km, the tower is a power grid mountain fire first-level early warning tower;
if d is more than or equal to 1km and less than 2km, the tower is a power grid mountain fire secondary early warning tower;
and if d is more than or equal to 2km and less than 3km, the tower is a power grid mountain fire three-level early warning tower.
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| CN112817572A (en) * | 2019-11-15 | 2021-05-18 | 内蒙古电力(集团)有限责任公司内蒙古电力科学研究院分公司 | Power transmission line forest fire early warning method |
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Application publication date: 20180327 |