WO2018019278A1

WO2018019278A1 - Small radar-based thunder and lightning monitoring and warning method for electric transmission line, and storage medium

Info

Publication number: WO2018019278A1
Application number: PCT/CN2017/094778
Authority: WO
Inventors: 谷山强; 冯万兴; 王剑; 郭钧天; 赵淳; 曾瑜; 王佩; 章涵; 吴大伟
Original assignee: 国网电力科学研究院武汉南瑞有限责任公司
Priority date: 2016-07-29
Filing date: 2017-07-27
Publication date: 2018-02-01
Also published as: AU2017303947A1; CN106019287A; AU2017303947B2; CN106019287B; ZA201808653B; WO2018018840A1

Abstract

A small radar-based thunder and lightning monitoring and warning method for an electric transmission line, and a computer storage medium. The small radar-based thunder and lightning monitoring and warning method for an electric transmission line comprises the following steps: step 1, obtaining multilayer radar echo reflectivity data of a small radar and obtaining thunder occurrence data by means of a thunder and lightning locator; step 2, determining a thunderstorm region according to the echo reflectivity data and the thunder occurrence data; step 3, determining the movement direction and velocity of the thunderstorm region; step 4, estimating the position of a thunderstorm that occurs in a further time point k and the thunder and lightning activity intensity according to the movement direction and velocity of the thunderstorm region; and step 5, determining whether a pole and a tower of an electric transmission line are located in the position of the thunderstorm that occurs in the further time point k, generating a determining result, and determining whether to generate an alarm according to the determining result.

Description

Lightning monitoring and early warning method and storage medium for transmission line based on small radar

Cross-reference to related applications

The present application is filed on the basis of the Chinese Patent Application No. No. No. No. No. No. No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No No

Technical field

The invention relates to the field of lightning monitoring and early warning for transmission lines, and particularly relates to a lightning monitoring and early warning method for a transmission line based on a small radar and a computer storage medium.

Background technique

Thunderstorm weather is a kind of weather phenomenon in natural phenomena. In recent years, disasters caused by lightning have occurred frequently and have shown a rapid upward trend. Lightning is extremely harmful to the safe operation of transmission lines. The fault of the transmission line accounts for a large proportion of the lightning strike trip. Preventing the lightning trip can greatly reduce the fault of the transmission line, thereby reducing the frequency of accidents in the power grid. After years of exploration, China's transmission line lightning protection has basically formed a series of effective conventional lightning protection methods, such as reducing grounding resistance, erecting lightning protection lines, installing automatic reclosing, etc., but for some mountainous lines, lightning damage is very frequent. Reducing the grounding resistance is extremely difficult, and the cost is high, the workload is large, and the effect is also limited. For this reason, the lightning protection needs to be targeted early warning, and the line that may be tripped by lightning strikes is mainly protected.

The existing lightning warning technology mainly relies on various hardware devices to monitor and capture the physical characteristics released before the occurrence of lightning, and each has its own advantages and disadvantages. The following are common. Ground electric field instrument: The ground electric field instrument can monitor the cloud charging condition within a certain radius above it. Therefore, by setting different electric field strength threshold levels, it is possible to predict the possibility of local lightning. Its shortcoming is that it is not known whether the increase in electric field reflects the local cloud charge or because there is a strong charge. The cloud moves toward the location of the electric field meter. Lightning broadband interferometer system: It can detect the weak discharge activity in the cloud before the occurrence of lightning, and the early warning of the occurrence of lightning, it can also use its wide-band characteristics to effectively identify and eliminate the interference signal of non-lightning radiation signals. The disadvantage is that the detection range is too small. Satellite: The satellite determines the occurrence of lightning by identifying the lightning cloud and tracking the trajectory of the estimated lightning cloud. However, satellites have a poor resolution of lightning cloud sub-categories, such as cloud flash and ground flash. Radar: Forecasting lightning by detecting the climatic characteristics of lightning. Specifically, the patent application file of the publication No. CN203054097U entitled "A lightning early warning networking system" describes a lightning early warning networking system using a common electric field instrument and other supporting equipment. The publication number CN202025042U named "Thunder Warning Device" proposes a scheme for estimating the distance of the lightning power source by using the dipole antenna to reach the elevation angle of the antenna array by means of the lightning radiation signal. The publication number CN102095943A entitled "Lightning warning method and device" provides a scheme for estimating the distance of the lightning power source by using the lightning interferometer principle to measure the elevation angle of the lightning radiation signal to the antenna array. In addition to single-type devices, and based on a combination of devices, the publication number CN202975175U entitled "A device for lightning warning" refers to the combination of multiple magnetic field monitoring antennas and an infrared spectrum monitoring system.

The existing lightning warning methods generally use only a few of radar, satellite, lightning data, atmospheric electric field instruments, etc., and do not combine their advantages and disadvantages and application scenarios in the lightning early warning system. The incomplete data will bring about the low degree of automation of the lightning potential forecast and the low spatial resolution of lightning warning and the low degree of automation of public and decision-making service materials for lightning potential prediction and lightning warning.

In view of this, it is necessary to provide a lightning monitoring and early warning method for transmission lines to solve the above problems.

Summary of the invention

In view of the deficiencies of the above prior art, the embodiments of the present invention provide a small radar based transmission line lightning monitoring and early warning method based on easy implementation of maintenance. Compared to the traditional way, this Embodiments of the invention make lightning warnings more accurate.

The technical solution adopted by the embodiment of the present invention is:

Embodiments of the present invention provide a lightning monitoring and early warning method for a transmission line based on a small radar, and the method includes the following steps:

Acquiring echo reflectance data of small radar multi-layer radar and obtaining lightning data by lightning locator;

Determining a thunderstorm region based on the echo reflectance data and the lightning data;

Determining the direction and speed of movement in the thunderstorm area;

According to the direction and speed of the thunderstorm region, the location of the thunderstorm at the future time k and the lightning activity intensity of the thunderstorm at the future time k are estimated;

Determining whether the transmission line tower is located in a position area where the thunderstorm occurs at a time k in the future, generating a judgment result, and determining whether an alarm is generated according to the judgment result.

As an embodiment, the determining the thunderstorm area based on the echo reflectance data and the lightning data includes:

Extracting echo reflectance data obtained by the radar device meteorological entity at time t;

Obtaining lightning data at time t by a lightning locator;

The Thundercloud is correlated with the lightning event to determine the overlap data of the echo reflectance data and the lightning data at time t; the overlap data corresponds to the thunderstorm region on the image.

As an embodiment, the determining the direction and speed of movement of the thunderstorm region includes:

Obtaining the echo radial velocity and tangential velocity of the thunderstorm region;

Based on the echo radial velocity and tangential velocity, the direction and velocity of the thunderstorm region are determined.

As an embodiment, the obtaining the radial radial velocity and the tangential velocity of the thunderstorm region include:

Reading the radial velocity of the thunderstorm region obtained by small radar detection;

Using the radar to track the trajectory of the thundercloud to obtain the tangential velocity;

Correspondingly, the determining the direction and speed of movement of the thunderstorm region based on the echo radial velocity and the tangential velocity, including:

The sum of the parallelogram vectors is used to find the combined speed and direction of the thundercloud motion.

As an embodiment, the estimated lightning activity intensity of a thunderstorm at a time k in the future includes:

Here, the historical lightning current amplitude data of the region where the thunderstorm region is located at the time k in the future is used to model the probability distribution map of the region;

According to the data input by the lightning locator, the curve fitting is performed, and the median current parameter related to the lightning activity intensity and the concentration parameter of the lightning current amplitude distribution are obtained;

The lightning activity intensity is determined according to the probability distribution map, the median current parameter, and the concentration degree parameter of the lightning current amplitude distribution.

The embodiment of the invention further provides a computer storage medium, wherein the computer storage medium stores computer executable instructions, and the computer executable instructions are used to execute the foregoing small radar based transmission line lightning monitoring and early warning method.

Compared with the prior art, the embodiment of the invention has the following beneficial effects:

1. The embodiment of the present invention combines radar and lightning locator to obtain lightning data, wherein the radar is a millimeter wave radar, which has the advantages of wide monitoring range and high accuracy.

2. For the early warning of the risk of transmission line towers, taking into account the self-strength of lightning and the tolerance level of the tower, the risk warning is closer to reality and the accuracy is higher.

DRAWINGS

1 is a flowchart of implementing a lightning monitoring and early warning method for a transmission line based on a small radar according to an embodiment of the present invention;

2 is a schematic diagram of a radar echo strong reflection region closely related to lightning activity according to an embodiment of the present invention;

FIG. 3 is a flowchart of a specific implementation of a lightning radar monitoring and early warning method for a transmission line based on a small radar according to an embodiment of the present invention.

detailed description

In order to better understand the present invention, the contents of the present invention will be further clarified below with reference to the embodiments, but the contents of the present invention are not limited to the following embodiments. A person skilled in the art can make various changes or modifications to the invention, and such equivalents are also within the scope of the appended claims.

As shown in FIG. 1 , an embodiment of the present invention provides a lightning monitoring and early warning method for a transmission line based on a small radar, and the method includes the following steps:

Step 1. Acquire the small radar multi-layer radar echo reflectance data and obtain the lightning data through the lightning locator;

Here, multi-layer radar echo reflectance data is first obtained by a small radar. In this embodiment, when multi-layer radar echo reflectance data is obtained by a small radar, special attention is paid to an active target at an altitude of 5,000 to 7,000 meters, and a radar echo strong reflection region closely related to lightning activity is obtained, as shown in FIG. The area shown by the rectangular frame in Fig. 2 is the radar echo strong reflection area. In the figure, if a lightning is represented by one point, then multiple lightnings appear in the image to become a face (stacking of multiple points), that is, where the black dots are stacked in Fig. 2, where lightning occurs. The rectangular frame area (arrow pointing) as shown in Fig. 2 is a radar echo strong reflection area. It should be understood by those skilled in the art that not all locations in the radar echo strong reflection region are where the actual lightning occurs.

Second, get a real lightning cloud. Here, the real lightning cloud data is obtained in two ways. One is the radar wave returned by a small radar on a wide area (the radar wave includes various meteorological clouds), and the other is the lightning data returned by the lightning locator.

Step 2. Determine a thunderstorm area based on the echo reflectance data and the lightning data;

The step 2 includes the following steps:

Step 2-1: at the current time t, extracting the echo reflectance data P obtained by the radar device meteorological entity;

Step 2-2: obtaining lightning data I at time t from the lightning locator;

Step 2-3: correlate the thundercloud with the lightning event, and determine the overlapping data of the echo reflectance data (cloud data) P returned by the radar and the lightning strike data I returned by the lightning locator;

If the cloud data P and the lightning data I are presented on the image, that is, the image represents the data related to the lightning and/or the lightning cloud, then the boundary can be found in the image by image segmentation, and the thunderstorm region can be drawn. The thunderstorm area corresponds to the overlapping data of the cloud data P and the lightning data I.

Step 3. Determine the direction and speed of movement of the thunderstorm area;

In this embodiment, step 3 may include:

Step 3-1: Acquire the echo radial velocity and tangential velocity of the thunderstorm region;

Here, the echo radial velocity is a basic parameter for small radars to detect lightning data, which can be obtained by small radars. The echo tangential velocity is obtained according to the radial velocity of the echo.

Step 3-2: Determine the direction and speed of the thunderstorm region based on the echo radial velocity and tangential velocity.

Here, the echo radial velocity and the tangential velocity are both vectors, and the vector can be summed to determine the direction and velocity of the thunderstorm region.

As a specific implementation manner, in step 3-1 and step 3-2, after obtaining the echo radial velocity by the small radar, tracking multiple volume scans (such as about 5 minutes per volume scan, usually 5 times) The tangential velocity of the region is derived, and finally the direction and speed of the thunderstorm region are comprehensively calculated.

In the specific implementation, since the radial velocity v is a basic parameter of the small radar for lightning data detection, when the lightning data is detected, the radial velocity v can be obtained, that is, the thunderstorm region obtained by the small radar detection is obtained. Radial velocity v; the data obtained by using the radar for volume scanning, such as the returned five times data, tracking the thundercloud motion trajectory to obtain the tangential velocity p; The parallelograms are summed by vectors to find the combined velocity and direction of the v and p of the thundercloud.

Step 4. According to the direction and speed of the thunderstorm region, estimate the location of the thunderstorm at the moment k and the intensity of the thunderstorm at the future k time;

Here, when the motion direction, speed, and motion time of the thunderstorm area are known (such as the time difference between the future k time and the current time), the motion distance can be obtained, that is, the position where the thunderstorm occurs at the future k time (k is a positive number) is obtained. . For the intensity of lightning activity in the future k time, due to the persistence of lightning activity and the short-term prediction interval, it is assumed that the current lightning quantity and lightning current distribution represent the potential lightning activity intensity of the future thunderstorm area. Using the historical lightning current amplitude data of the region where the thunderstorm region is located at the time k in the future, model the lightning current probability distribution function, determine the weight of the constant and then obtain the probability distribution map of the region; according to the lightning location The data input by the instrument is subjected to curve fitting, and the a and b parameters related to the lightning activity intensity are obtained, and the lightning activity is determined according to the probability distribution map, the median current parameter and the concentration parameter of the lightning current amplitude distribution. strength. Where: a is the median current (the probability of occurrence of lightning current exceeding this amplitude is 50%), kA (kilograms); b is the concentration parameter of the distribution of lightning current amplitude. The size of the a and b parameters represents the strength of the lightning activity. If an area has a lightning current that exceeds its value, the probability of lightning in the area is 50%. If the lightning intensity parameter is made more precise, the least squares method can be used to control the errors of the two parameters a and b.

Step 5: determining whether the transmission line tower is located in a location area where the thunderstorm occurs at a time k in the future, generating a determination result, and determining whether an alarm is generated according to the determination result;

Here, if the location where the thunderstorm appears in the future k time is the thunderstorm prediction area, then the step is to retrieve the tower data base, read the coordinates of the transmission line tower, and judge whether the transmission line tower is located in the thunderstorm prediction area according to the coordinates. If it is not located, no alarm is generated, and if it is located, an alarm is generated.

In engineering implementation, as an implementation method, when judging that the transmission line tower is located in the thunderstorm prediction area, it is also necessary to consider the lightning protection level of the tower, and determine whether to enter according to the lightning resistance characteristics of the tower. Line alarm. Here, considering the occurrence of an alarm event, in addition to the strength of the lightning itself, the occurrence of the risk is also related to the lightning resistance level of the tower. The level of lightning resistance refers to the level of tolerance present in the subject itself. As the transmission line insulation parameters and other parameters increase with the increase of the transmission line voltage level, the transmission line voltage level determines the range of its lightning protection level; again, the structure of the transmission line and its parameters are important factors affecting its lightning resistance level. If it is judged that the coordinates of the transmission line tower are located in the thunderstorm prediction area and the lightning resistance is inferior, the alarm is required; if the coordinates of the transmission line tower are located in the thunderstorm prediction area, the judgment is located. Thunderstorm prediction area and lightning resistance characteristics are better, and no alarm is required. That is, the embodiment of the present invention is based on the position matching of the two areas of the transmission line tower area and the thunderstorm prediction area, and simultaneously considers the lightning protection level of the tower, and issues an alarm to the transmission line tower of the lightning strike.

In the embodiment of the invention, the radar and the lightning positioning instrument are simultaneously used to obtain a plurality of lightning data, so that the positioning hardware is more comprehensive and more targeted. Among them, in order to overcome the radar, the satellite can only identify the cloud layer, and can not distinguish whether the cloud layer may have lightning phenomenon. The lightning locator can screen the part that is more likely to generate lightning. By using the historical data of lightning occurrence and the radial velocity and tangential velocity of the lightning cloud fed back by the radar, the position of the lightning in the future moment can be derived in real time, and the activity intensity in the possible thunderstorm region in the future can be derived. At the target end, based on the position matching of the two areas of the transmission line tower area and the thunderstorm prediction area, and considering the lightning protection level of the tower, an alarm is issued to the power transmission tower of the lightning strike. With the embodiment of the invention, the lightning warning can be made more accurate.

The embodiment of the present invention further provides a computer storage medium, where the computer storage medium stores an executable program, and when the executable program is executed by the processor, the small radar-based transmission line lightning device provided by the embodiment of the present invention is implemented. The monitoring and early warning method, for example, the small radar based transmission line lightning monitoring and early warning method shown in FIG. 1 and FIG.

Specifically, as an implementation manner, when the computer executable instructions are executed by the processor, execute:

Obtaining small radar multi-layer radar echo reflectance data and obtaining lightning data by lightning locator; determining a thunderstorm region based on the echo reflectance data and lightning data; determining a moving direction and speed of the thunderstorm region; Direction and speed, estimate the location of the thunderstorm at the moment k and its lightning activity intensity; determine whether the transmission line tower is located in the location area where the thunderstorm appears in the future k time, generate a judgment result, and determine whether according to the judgment result An alarm is generated.

The storage medium includes a volatile random access memory (RAM), a read only memory (ROM), an electrically erasable programmable read only memory (EEPROM), a flash memory or other memory technology, a compact disk (CD-ROM), Digital versatile disc (DVD) or other medium that is accessed.

The contents not described in detail in the specification belong to the prior art known to those skilled in the art.

Those skilled in the art will appreciate that embodiments of the present invention can be provided as a method, system, or computer program product. Accordingly, the present invention can take the form of a hardware embodiment, a software embodiment, or a combination of software and hardware. Moreover, the invention can take the form of a computer program product embodied on one or more computer-usable storage media (including but not limited to disk storage and optical storage, etc.) including computer usable program code.

The present invention has been described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (system), and computer program products according to embodiments of the invention. It will be understood that each flow and/or block of the flowchart illustrations and/or FIG. These computer program instructions can be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing device to produce a machine for the execution of instructions for execution by a processor of a computer or other programmable data processing device. Means for implementing the functions specified in one or more of the flow or in a block or blocks of the flow chart.

These computer program instructions can also be stored in a bootable computer or other programmable data processing The apparatus is readable in a computer readable memory in a particular manner such that instructions stored in the computer readable memory produce an article of manufacture comprising instruction means implemented in one or more flows and/or block diagrams of the flowchart The function specified in the box or in multiple boxes.

These computer program instructions can also be loaded onto a computer or other programmable data processing device such that a series of operational steps are performed on a computer or other programmable device to produce computer-implemented processing for execution on a computer or other programmable device. The instructions provide steps for implementing the functions specified in one or more of the flow or in a block or blocks of a flow diagram.

The above is only the preferred embodiment of the present invention and is not intended to limit the scope of the present invention.

Industrial applicability

In the embodiment of the invention, the radar (small radar) and the lightning positioning instrument are simultaneously used to obtain the monitoring data required for various lightning warnings, so that the positioning hardware is more comprehensive and more targeted. Among them, in order to overcome the radar, the satellite can only identify the cloud layer, and can not distinguish whether the cloud layer may have lightning phenomenon. The lightning locator can screen the part that is more likely to generate lightning. By using the historical data of lightning occurrence and the radial velocity and tangential velocity of the lightning cloud fed back by the radar, the position of the lightning in the future moment can be derived in real time, and the activity intensity in the possible thunderstorm region in the future can be derived. At the target end, based on the position matching of the two areas of the transmission line tower area and the thunderstorm prediction area, and considering the lightning protection level of the tower, an alarm is issued to the power transmission tower of the lightning strike. With the embodiment of the invention, the lightning warning can be made more accurate.

Claims

A lightning radar monitoring and early warning method for transmission lines based on small radar, the method comprising the following steps:

Acquiring echo reflectance data of small radar multi-layer radar and obtaining lightning data by lightning locator;

Determining a thunderstorm region based on the echo reflectance data and the lightning data;

Determining the direction and speed of movement in the thunderstorm area;

According to the direction and speed of the thunderstorm region, the location of the thunderstorm at the future time k and the lightning activity intensity of the thunderstorm at the future time k are estimated;

Determining whether the transmission line tower is located in a position area where the thunderstorm occurs at a time k in the future, generating a judgment result, and determining whether an alarm is generated according to the judgment result.
The small radar-based transmission line lightning monitoring and warning method according to claim 1, wherein the determining the thunderstorm area based on the echo reflectance data and the lightning data comprises:

Extracting echo reflectance data obtained by the radar device meteorological entity at time t;

Obtaining lightning data at time t by a lightning locator;

The Thundercloud is correlated with the lightning event to determine the overlap data of the echo reflectance data and the lightning data at time t; the overlap data corresponds to the thunderstorm region on the image.
The small-radar-based transmission line lightning monitoring and warning method according to claim 1, wherein the determining the direction and speed of the thunderstorm region includes:

Obtaining the echo radial velocity and tangential velocity of the thunderstorm region;

Based on the echo radial velocity and tangential velocity, the direction and velocity of the thunderstorm region are determined.
The small radar-based lightning line monitoring and early warning method for a transmission line according to claim 3, wherein the obtaining the radial radial velocity and the tangential velocity of the thunderstorm region comprises:

Reading the radial velocity of the thunderstorm region obtained by small radar detection;

Using the radar to track the trajectory of the thundercloud to obtain the tangential velocity;

Correspondingly, the determining the direction and speed of movement of the thunderstorm region based on the echo radial velocity and the tangential velocity, including:

The sum of the parallelogram vectors is used to find the combined speed and direction of the thundercloud motion.
The small radar-based lightning line monitoring and early warning method for a transmission line according to claim 1, wherein the estimated lightning activity intensity of the thunderstorm at a future k time comprises:

Using the historical lightning current amplitude data of the region where the thunderstorm region is located at the time k in the future, the probability distribution map of the region is obtained;

According to the data input by the lightning locator, the curve fitting is performed, and the median current parameter related to the lightning activity intensity and the concentration parameter of the lightning current amplitude distribution are obtained;

The lightning activity intensity is determined according to the probability distribution map, the median current parameter, and the concentration degree parameter of the lightning current amplitude distribution.
A computer storage medium, wherein the computer storage medium stores computer executable instructions for performing a small radar based transmission line lightning according to any one of claims 1 to 5. Monitoring early warning methods.