CN113554266A - Power grid damage risk early warning method and system caused by strong wind under typhoon condition - Google Patents
Power grid damage risk early warning method and system caused by strong wind under typhoon condition Download PDFInfo
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Abstract
The invention discloses a method and a system for early warning the risk of power grid damage caused by strong wind under typhoon conditions, wherein the method comprises the following steps: collecting historical typhoon strong wind data, and setting typhoon strong wind judgment threshold values with different intensities according to the early warning area and the historical typhoon strong wind data which are respectively expanded in a certain range from south to north; collecting tower position information, line trend information and equipment strong wind bearing design standards of an early warning area; calculating wind speed values of typhoon strong wind judging threshold values with different intensities, which are vertical to the tower and the line, according to the tower position information and the main wind direction in the line trend information, the line trend and the included angles of the wind direction and the tower position of the tower; comparing the tower and line strong wind bearing design standard with the corresponding wind speed numerical value, judging the typhoon strong wind damage risk level possibly appearing on the equipment on the corresponding tower and line, and carrying out risk early warning according to the level. The invention can effectively improve the technical level of coping with typhoon and strong wind disasters of the overhead transmission line.
Description
Technical Field
The invention relates to the technical field of power grid protection, in particular to a method and a system for early warning of power grid damage risks caused by strong wind under a typhoon condition.
Background
The power grids in coastal areas of east and south China are subjected to typhoon invasion every year, according to statistics, 25-28 typhoons are generated in the western pacific and south sea areas every year, 6-9 of the typhoons can land on continents of China, records are recorded in 1949, and typhoons land in southern province, southern province and Liaoning province. The strong wind carried after the typhoon landing can easily cause the line windage tripping, the line disconnection and even the tower collapse.
The line windage yaw tripping is that the electrical clearance of the charged part to the grounding component or the adjacent object is insufficient due to the fact that a windage yaw angle under a strong wind load exceeds a design allowable value, so that the line flashover tripping is caused; the tower strong wind falling is that strong wind causes the stress of the tower angle steel component to exceed the designed bearing capacity, resulting in the instability of the tower. At present, power grid companies are gradually built for years in line and pole towers, the design standards of the line and the pole tower are different in different development periods and different areas, the bearing capacity of the line and the pole tower to typhoon strong wind disasters is different, and the damage conditions of the line and the pole tower under typhoon strong wind conditions are also different. Therefore, the risk judgment of the power grid damage caused by strong wind under the typhoon condition needs to be carried out, lines and towers with high risk of damage of the power grid under the typhoon condition are found out, and the power grid disaster prevention and control and the upgrading and reconstruction of power grid equipment are guided.
Disclosure of Invention
The invention provides a method and a system for early warning of power grid damage risks caused by strong wind under a typhoon condition, which are used for solving the technical problems of judgment and early warning of power grid damage risks caused by strong wind under the typhoon condition.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a power grid damage risk early warning method caused by strong wind under the typhoon condition comprises the following steps:
collecting historical typhoon strong wind data, and setting typhoon strong wind judgment threshold values with different intensities according to the early warning area and the historical typhoon strong wind data which are respectively expanded in a certain range from south to north;
collecting tower position information, line trend information and equipment strong wind bearing design standards of an early warning area;
calculating wind speed values of typhoon strong wind judging threshold values with different intensities, which are vertical to the tower and the line, according to the tower position information and the main wind direction in the line trend information, the line trend and the included angles of the wind direction and the tower position of the tower;
comparing tower and line strong wind bearing design standards and typhoon strong wind judgment threshold values with different strengths vertically to wind speed values on the towers and the lines, and judging the typhoon strong wind damage risk level possibly occurring on corresponding towers and equipment on the lines;
and carrying out risk early warning on the power grid tower and the equipment according to the possibly-occurring typhoon strong wind damage risk level of the equipment.
Preferably, the historical typhoon strong wind data comprises: historical typhoon data, and average wind speed and gust wind speed data observed by a ground meteorological station in a typhoon landing process.
Preferably, the method for setting the typhoon strong wind determination threshold with different intensities further comprises the following steps:
a) and determining a coefficient ratio of the average wind speed and the maximum gust wind speed.
b) Sorting the maximum wind speed in the previous typhoon process from big to small, and taking the maximum wind speed data, namely the extreme strong typhoon wind speed threshold standard of the area; multiplying the extreme strong typhoon wind speed threshold standard by the gust average wind coefficient to obtain the extreme strong typhoon gust wind speed threshold standard;
taking the wind speed data on the 5 th percentile, namely the wind speed threshold standard of the strong typhoon in the area; multiplying the wind speed threshold standard of the strong typhoon by the gust average wind coefficient to obtain the wind speed threshold standard of the strong typhoon gust;
and taking the wind speed data on the median, namely the average typhoon wind speed threshold standard of the area, and multiplying the average typhoon wind speed threshold data standard by the gust average wind coefficient, namely the average typhoon gust wind speed threshold standard.
Preferably, the typhoon strong wind determination threshold values with different intensities comprise three typhoon wind speed threshold values: an extreme strong typhoon gust wind speed threshold, a strong typhoon gust wind speed threshold and an average typhoon gust wind speed threshold;
the corresponding wind speed values vertical to the tower and the line comprise: the wind speed value of the extreme strong typhoon gust, the wind speed value of the strong typhoon gust and the wind speed value of the average typhoon gust.
The present invention also provides a computer system comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the processor implementing the steps of any of the methods described above when executing the computer program.
The invention has the following beneficial effects:
the method and the system for early warning the power grid damage risk caused by strong wind under the typhoon condition have clear thought, strong practicability and high accuracy, and can effectively improve the technical level of coping with typhoon strong wind disasters of the overhead transmission line. The method can be widely applied to identification and early warning of power grid damage risks caused by strong wind according to typhoon and strong wind conditions, lines and tower conditions.
In addition to the objects, features and advantages described above, other objects, features and advantages of the present invention are also provided. The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic flow chart of a power grid damage risk early warning method caused by strong wind in a typhoon condition according to an embodiment 1 of the present invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
Example 1
Referring to fig. 1, the method for early warning the risk of power grid damage caused by strong wind under typhoon condition is disclosed. The method comprises the following steps:
s1, collecting and sorting historical typhoon strong wind data:
and collecting historical typhoon strong wind data, and expanding the historical typhoon strong wind data within a certain range according to the early warning area and the south to north. As the typhoon landing point has randomness and uncertainty, the 200km ranges from south to north are oriented by taking the early warning area as the center, and 50 year old typhoon data in the range of 1971 and 2020, and the average wind speed and gust wind speed data observed by the ground meteorological station in the typhoon landing process are collected from the meteorological department.
And (4) sorting historical typhoon strong wind data, and setting typhoon strong wind judging threshold values with different intensities.
The following are the preferred threshold value judgment of the typhoon with different intensities in a certain area:
a) determining a coefficient ratio of the average wind speed to the maximum gust wind speed;
b) sorting the maximum wind speed in the previous typhoon process from big to small, and taking the maximum wind speed data as the threshold standard of the extremely strong typhoon wind speed in the area; multiplying the extreme strong typhoon wind speed threshold standard by the gust average wind coefficient to serve as the extreme strong typhoon gust wind speed threshold standard;
taking the wind speed data on the 5 th percentile, namely the wind speed threshold standard of the strong typhoon in the area; multiplying the wind speed threshold standard of the strong typhoon by the gust average wind coefficient to obtain the wind speed threshold standard of the strong typhoon gust;
and taking the wind speed data on the median, namely the average typhoon wind speed threshold standard of the area, and multiplying the average typhoon wind speed threshold data standard by the gust average wind coefficient, namely the average typhoon gust wind speed threshold standard.
And S2, collecting tower position information, line trend information and equipment strong wind bearing design standard of the early warning area.
Because the typhoon system is a quasi-circular system, the main wind directions are northeast wind and southwest wind, and three wind speed values (an extreme typhoon gust wind speed threshold value standard, a strong typhoon gust wind speed threshold value standard and an average typhoon gust wind speed threshold value standard) vertical to the tower and the line are calculated according to the main wind direction, the line trend, the wind direction and the included angle of the tower position of the tower.
S3, calculating wind speed values of the typhoon strong wind determination threshold with three intensities, which are perpendicular to the tower and the line, according to the main wind direction in the tower position information and the line trend information and the included angle between the wind direction and the tower position of the tower.
And S4, comparing tower and line strong wind bearing design standards and wind speed values of different intensities of typhoon strong wind judgment thresholds vertical to the towers and the lines, and judging the possible typhoon strong wind damage risk level of the corresponding towers and the equipment on the lines.
In this embodiment, the strong wind damage risk identification of the line tower preferably adopts the following method:
comparing the tower and line strong wind bearing design standard with the extreme strong typhoon gust wind speed value, the strong typhoon gust wind speed value and the average typhoon gust wind speed value which are perpendicular to the tower and the line:
a) the design standard of tower and line strong wind bearing is higher than the numerical value of the wind speed of extreme strong typhoon gust which is vertical to the tower and the line, the equipment can bear typhoon strong wind, and the damage risk of the typhoon strong wind is extremely low;
b) the tower and line strong wind bearing design standard is lower than the numerical value of the wind speed of the extremely strong typhoon gust which is vertical to the tower and line, but higher than the numerical value of the wind speed of the strong typhoon gust which is vertical to the tower and line; the equipment can bear most of typhoon strong wind, and the risk of typhoon strong wind damage can occur only when extreme strong typhoon occurs;
c) the tower and line strong wind bearing design standard is lower than the numerical value of the wind speed of strong typhoon gusts vertical to the tower and the line, but higher than the numerical value of the wind speed of average typhoon gusts vertical to the tower and the line; the equipment can bear general typhoon strong wind, and the risk of typhoon strong wind damage can occur when strong typhoon occurs;
d) the design standard of tower and line strong wind bearing is lower than the average typhoon gust wind speed value vertical to the tower and the line, the capability of the equipment for bearing typhoon strong wind is poor, and the risk of typhoon strong wind damage is extremely high.
And S5, performing risk early warning on the power grid tower and the equipment according to the possible typhoon strong wind damage risk level of the equipment.
According to the grade judgment result, when the typhoon is about to log in, the risk early warning of the power grid tower and the equipment can be carried out according to the typhoon intensity and the wind speed prediction; when equipment upgrading and transformation are carried out, high-risk equipment upgrading and transformation can be carried out in limited consideration.
Example 2:
the steps of this embodiment are basically the same as those of embodiment 1, and this embodiment takes the building grid of Fujian province as an example to illustrate the application of the method for warning the risk of grid damage caused by strong wind under typhoon condition. The method and the system for early warning the risk of power grid damage caused by strong wind under the typhoon condition are explained by taking a mansion area as an early warning area, wherein the Fujian power grid is one of serious disaster areas affected by typhoon in China, and the method comprises the following steps:
s1, collecting and sorting historical typhoon strong wind data:
as the typhoon landing points have randomness and uncertainty, the 200km ranges from south to north are oriented by taking Fujian as a center, the historical typhoon data of the range in 50 years and 83 times in 50 years in 1971 and 2020, the average wind speed observed by the ground meteorological station in the typhoon landing process and the gust wind speed data are collected from the meteorological department, and the wind speed data are sorted.
And S2, sorting historical typhoon strong wind data, and setting typhoon strong wind judgment threshold values with different intensities.
Counting and sorting historical typhoon data, average wind speed data observed by a ground meteorological station in a typhoon landing process and gust wind speed data, and determining the following key data:
a) the coefficient ratio of the average wind speed to the maximum gust wind speed is determined, the coefficient ratio of the maximum gust wind speed to the average wind speed in the current tower and line design is generally 1.5, and statistics shows that the coefficient of the maximum gust wind speed and the average wind speed observed by the weather station can reach 1.6-1.7 actually.
b) Sorting the maximum wind speed in the 83 typhoon processes from big to small, wherein the maximum wind speed data is 42.9m/s, namely the threshold standard of the extremely strong typhoon wind speed in the area is 42.9 m/s; multiplying the extreme strong typhoon wind speed threshold standard by the gust average wind coefficient to obtain the extreme strong typhoon gust wind speed threshold standard which is 72.9 m/s;
the wind speed data on the 5 th percentile is 34.3m/s, namely the wind speed threshold standard of the strong typhoon in the area is 34.3 m/s; multiplying the standard of the wind speed threshold of the strong typhoon by the average wind coefficient of the gust to obtain the standard of the wind speed threshold of the strong typhoon gust, wherein the standard of the wind speed threshold of the strong typhoon gust is 58.6 m/s;
the wind speed data on the median is 28m/s, namely the average typhoon wind speed threshold value standard of the area is 28m/s, and the average typhoon wind speed threshold value data standard is multiplied by the gust average wind coefficient, namely the average typhoon gust wind speed threshold value standard is 47.6 m/s.
S3 to S5 are the same as in example 1.
By adopting the method, the power grid damage risk judgment and early warning caused by strong wind in the Fujian mansion area are carried out, the practicability is high, the accuracy rate is high, and the effect is obvious.
Example 3:
the present invention also provides a computer system comprising a memory, a processor and a computer program stored on the memory and executable on the processor, the steps of any of the above embodiments being implemented when the computer program is executed by the processor.
In conclusion, the method comprehensively judges the possible typhoon strong wind damage risk level of the tower and the equipment on the line by combining the historical typhoon strong wind information and the actual tower and line strong wind bearing design standard, and carries out grading early warning according to the risk level, so that the method has clear thought, strong practicability and high accuracy, and can effectively improve the technical level of overhead transmission line typhoon strong wind disaster response. The method can be widely applied to identification and early warning of power grid damage risks caused by strong wind according to typhoon and strong wind conditions, lines and tower conditions.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (5)
1. A power grid damage risk early warning method caused by strong wind under the typhoon condition is characterized by comprising the following steps:
collecting historical typhoon strong wind data, and setting typhoon strong wind judgment threshold values with different intensities according to the early warning area and the historical typhoon strong wind data which are respectively expanded in a certain range from south to north;
collecting tower position information, line trend information and equipment strong wind bearing design standards of an early warning area;
calculating wind speed values of typhoon strong wind judging threshold values with different intensities, which are vertical to the tower and the line, according to the tower position information and the main wind direction in the line trend information, the line trend and the included angles of the wind direction and the tower position of the tower;
comparing tower and line strong wind bearing design standards and typhoon strong wind judgment threshold values with different strengths vertically to wind speed values on the towers and the lines, and judging the typhoon strong wind damage risk level possibly occurring on corresponding towers and equipment on the lines;
and carrying out risk early warning on the power grid tower and the equipment according to the possibly-occurring typhoon strong wind damage risk level of the equipment.
2. The method for early warning of power grid damage risk caused by strong wind under typhoon condition as claimed in claim 1, wherein the historical typhoon strong wind data comprises: historical typhoon data, and average wind speed and gust wind speed data observed by a ground meteorological station in a typhoon landing process.
3. The method for early warning of power grid damage risk caused by strong wind under typhoon condition according to claim 2, wherein the setting of the typhoon strong wind determination threshold values with different intensities further comprises the following steps:
a) and determining a coefficient ratio of the average wind speed and the maximum gust wind speed.
b) Sorting the maximum wind speed in the previous typhoon process from big to small, and taking the maximum wind speed data, namely the extreme strong typhoon wind speed threshold standard of the area; multiplying the extreme strong typhoon wind speed threshold standard by the gust average wind coefficient to obtain the extreme strong typhoon gust wind speed threshold standard;
taking the wind speed data on the 5 th percentile, namely the wind speed threshold standard of the strong typhoon in the area; multiplying the wind speed threshold standard of the strong typhoon by the gust average wind coefficient to obtain the wind speed threshold standard of the strong typhoon gust;
and taking the wind speed data on the median, namely the average typhoon wind speed threshold standard of the area, and multiplying the average typhoon wind speed threshold data standard by the gust average wind coefficient, namely the average typhoon gust wind speed threshold standard.
4. The pre-warning method for power grid damage risk caused by strong wind under typhoon condition as claimed in claim 2,
the typhoon strong wind judging threshold values with different intensities comprise three typhoon wind speed threshold values: an extreme strong typhoon gust wind speed threshold, a strong typhoon gust wind speed threshold and an average typhoon gust wind speed threshold;
the corresponding wind speed values vertical to the tower and the line comprise: the wind speed value of the extreme strong typhoon gust, the wind speed value of the strong typhoon gust and the wind speed value of the average typhoon gust.
5. A computer system comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the steps of the method of any one of claims 1 to 4 are performed when the computer program is executed by the processor.
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