Transverse wind prediction method and system for overhead transmission line

Abstract

The invention belongs to the technical field of electric power weather forecast, and discloses a transverse wind prediction method and system for an overhead transmission line, and the method comprises the steps: obtaining the position and line height information of the overhead transmission line, and numerical weather forecast data, and calculating the longitudinal wind and the latitudinal wind predicted at the line height; establishing a coordinate system in which the power transmission line is coordinated with the numerical forecasting wind field; constructing an analysis model for forecasting the wind direction and the trend of the power transmission line section by combining the coordination coordinate system, the warp-direction wind and weft-direction wind data at the line height and the position information of the overhead power transmission line; and based on the analysis model for forecasting the wind direction and the trend of the power transmission line section, combining the longitudinal wind and the latitudinal wind forecasted at the height of the line, establishing a transverse wind size forecasting model for the line section, and forecasting the transverse wind of the overhead power transmission line. According to the method, the warp wind and the weft wind at the height of the power transmission line can be calculated more accurately, so that accurate basic data is provided for subsequent wind direction and transverse wind calculation.

Description

Technical Field

[0001] The invention belongs to the technical field of electric power meteorological forecasting, and in particular relates to a method and system for predicting lateral wind of overhead transmission lines. Background Art

[0002] The lateral wind (i.e., wind perpendicular to the direction of the line section, also known as side wind or cross wind) facing the transmission line section has the most important impact on the calculation of line wind load. The force of lateral wind may cause the transmission tower to tilt or collapse, and even cause large-scale power outages. Strong wind events in many places have caused serious damage to transmission lines. This shows that the potential harm of lateral wind to transmission lines cannot be ignored. The lateral wind speed not only directly affects the wind load calculation of the transmission line, affecting the vibration and stability of the line, but also may cause the tilt and fracture of the tower and damage to key equipment such as insulators, thereby causing power transmission interruptions and system failures, thereby affecting the reliable supply of electricity and the overall safe operation of the power grid. In addition, the frequent occurrence of extreme lateral wind speed events increases the maintenance and repair costs of power grid facilities, resulting in huge economic losses and social impacts. Therefore, how to carry out accurate lateral wind prediction for overhead transmission lines is one of the important technologies to ensure the safe operation of power grid facilities.

[0003] Then, the current lateral wind forecast for line sections has the following shortcomings. First, the wind speed and wind direction output height of the numerical weather forecast model is not sufficiently compatible with the height of the transmission line, and the wind force cannot be effectively converted to the line height, and the wind force received by the line cannot be accurately reflected, resulting in low forecast accuracy. Second, there is a serious lack of consideration for the direction of the line section and the angle between it and the wind direction at the line height. There is a lack of a coordinated coordinate system and an analysis model for the direction angle of the line section and its angle with the wind direction, which seriously affects the accuracy of the lateral wind forecast. These deficiencies have led to low accuracy in extreme wind speed forecasts, which cannot fully meet the requirements for safe operation of the power grid. Summary of the invention

[0004] The object of the present invention is to provide a method and system for predicting lateral wind of an overhead transmission line, so as to solve the problem of low accuracy of prediction in the prior art.

[0005] To achieve the above object, the present invention adopts the following technical solutions: In a first aspect, the present invention provides a method for predicting lateral wind of an overhead transmission line, comprising: Obtain the location and line height information of the overhead transmission line, as well as numerical weather forecast data, and calculate the predicted meridional and zonal winds at the line height; Establish a coordinate system for transmission lines and numerical wind forecasting; Combining the coordinated coordinate system, the meridional and zonal wind data at the line height, and the location information of the overhead transmission line, an analytical model for forecasting wind direction and the direction of the transmission line section is constructed; Based on the analysis model of the predicted wind direction and the direction of the transmission line section, combined with the predicted meridional wind and latitudinal wind at the line height, a lateral wind prediction model for the line section is established to predict the lateral wind of the overhead transmission line.

[0006] Furthermore, the acquisition of the location and line height information of the overhead transmission line, and numerical weather forecast data, includes: The location and line height information of the overhead transmission line includes the longitude x and latitude y of the transmission line towers at each level, and the height h of the transmission line section; Extract the conventional data of numerical weather forecast for the grid corresponding to the line segment: Based on the gridded numerical weather forecast covering the transmission line, according to the longitude and latitude information of the line towers, establish a matching relationship between each line segment and the numerical weather forecast grid, and extract the conventional data of the corresponding grid points from the numerical weather forecast results.

[0007] Furthermore, the calculation of the predicted meridional wind and zonal wind at the line height includes: The linear interpolation method is used to calculate the wind component at the height of the transmission line, as shown in formula (1): (1.) in, Indicates the height of the transmission line The wind component at the location, i.e., meridional wind or zonal wind; and Two known heights and The wind force at The meridional wind and zonal wind at the line segment are interpolated and calculated respectively. According to the different heights of each line segment, the meridional wind and zonal wind at the line height are calculated respectively. The specific calculation is shown in formula (2): (2.) in, and Transmission line height Meridional and zonal winds at and Two known heights and The meridian wind, and The two known heights are and The zonal wind.

[0008] Furthermore, the establishment of a coordinate system for coordinating the transmission line with the numerical wind forecasting field includes: Wind components based on numerical weather forecasts, i.e. meridional wind and zonal wind , establish the coordinate system for calculation, as follows: Meridional wind and zonal wind Orthogonal, meridian wind is the wind component along the longitude of the Earth, the zonal wind The wind direction is the direction of the wind. The wind direction arrow points to the north at 0°, and moves clockwise. When the wind direction arrow points to the east at 90°, the wind direction is 0°. ; When the wind direction is 90°, ; Based on the coordinate system of the wind component of numerical weather forecast, the longitude and latitude information of the transmission line tower is placed on the wind component coordinate system, and the longitude is specified. Changes on the horizontal axis of the coordinate system, latitude Changes on the vertical axis of the coordinate system; when the longitude and latitude changes of adjacent towers are used to indicate the direction of the line, the wind direction is agreed to be the direction of the wind. The wind direction arrow points to the north at 0°, and moves clockwise. When the wind direction arrow points to the east, it is 90°. When the wind direction is 0°, ; When the wind direction is 90°, .

[0009] Furthermore, the analysis model for forecasting wind direction and transmission line section direction is constructed by combining the coordinated coordinate system, the meridional wind and zonal wind data at the line height, and the location information of the overhead transmission line, including: The wind direction at the line height is calculated based on the wind component coordinate system, and the transmission line height is calculated by Meridional wind and zonal wind , the wind direction corresponding to the line height for: (3.) in, is the inverse tangent function; Based on the wind component coordinate system, the direction of each line segment is calculated. By the tower and Composed of towers The longitude and latitude coordinates of Tower The longitude and latitude coordinates of ; Line segment Trend for: (4.) in, is the inverse tangent function, Represents the change in longitude of the line segment, is the dimensional change of the line segment, which can be calculated from the longitude and latitude coordinates of the towers at both ends of the line segment; Convert the wind direction angle and line segment strike angle to the interval [0,360] and introduce the four-quadrant inverse tangent function Calculate the angle: (5.) in, , so that the function range becomes On this basis, by adjusting the value range and the conversion between radians and angles, the angle is made to fall between The specific interval is as shown in formula (6): (6.) in, The result is returned in radians, multiplied by It is converted to an angle.

[0010] Furthermore, the analysis model based on the predicted wind direction and the direction of the transmission line section is combined with the predicted meridional wind and zonal wind at the line height to establish a lateral wind magnitude prediction model for the line section, including: The calculation of the synthetic wind speed at the transmission line height is based on the calculated transmission line height Meridional wind and zonal wind , calculate the size of the composite wind speed based on its orthogonality: (7.) The calculation of the angle between the transmission line section and the wind direction is based on the wind direction angle and transmission line section strike angle , and their values ​​are adjusted Within the interval, in the same coordinate system, the angle α between the transmission line section and the wind direction is calculated as: (8.) The transmission line section direction and wind direction angle are adjusted to Within the range, specifically: (9.) The calculation of the lateral wind size facing the transmission line is based on the synthetic wind speed and the angle between the transmission line section and the wind direction. Size: (10.).

[0011] Furthermore, the above-mentioned prediction of lateral wind of overhead transmission lines includes: The lateral wind prediction for time and space dual-loop iteration is based on the lateral wind model. For each integral time step of the numerical weather forecast and each line section of the transmission line, a time and space dual-loop iteration is carried out to calculate the lateral wind results for each tower iteration at each forecast time. For the tower-level and minute-level lateral wind forecast of transmission lines, the lateral wind results calculated at each integral time step and tower-by-tower iteration are judged against the wind protection parameters of the line design. When the lateral wind is greater than the design parameters, a refined high wind warning will be issued for the line section and integral time step.

[0012] In a second aspect, the present invention provides a system for predicting lateral wind of an overhead transmission line, comprising: A data acquisition module is used to obtain the location and line height information of the overhead transmission line, as well as numerical weather forecast data, and calculate the predicted meridional wind and zonal wind at the line height; A coordinate system building module is used to establish a coordinate system that coordinates the transmission line and the numerical wind forecasting field; An analysis model building module is used to build an analysis model for forecasting wind direction and transmission line segment direction by combining the coordinated coordinate system, the meridional wind and zonal wind data at the line height, and the location information of the overhead transmission line; The prediction module is used to establish a lateral wind prediction model for the line section based on the analysis model of the predicted wind direction and the direction of the transmission line section, combined with the predicted longitudinal wind and latitudinal wind at the line height, to predict the lateral wind of the overhead transmission line.

[0013] In a third aspect, the present invention provides a computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of a method for predicting lateral wind of overhead transmission lines when executing the computer program.

[0014] In a fourth aspect, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for predicting lateral wind of an overhead transmission line are implemented.

[0015] Compared with the prior art, the present invention has the following technical effects: The present invention solves this problem effectively by performing linear interpolation on the meridional wind and the latitudinal wind respectively, thereby ensuring the accuracy of the wind direction. Through the linear interpolation method, the present invention can more accurately calculate the meridional wind and the latitudinal wind at the height of the transmission line, thereby providing accurate basic data for the subsequent calculation of the wind direction and the lateral wind size.

[0016] The present invention proposes a coordinate system based on the wind component of numerical weather forecast, orthogonalizes the meridional wind and the zonal wind, and stipulates the angle calculation rules of the wind direction and the direction of the line segment. The establishment of this coordinate system enables the analysis of the wind direction angle and the direction angle of the line segment to be carried out in the same coordinate system, greatly simplifying the subsequent angle calculation and coordination process.

[0017] The present invention can accurately calculate the magnitude of the lateral wind received by the transmission line segment by calculating the synthetic wind speed at the line height and the angle between the wind direction and the line segment direction. This method takes into account the relative relationship between the wind direction and the line segment direction, making the prediction of the lateral wind more in line with the actual situation and improving the prediction accuracy.

[0018] The present invention can predict the magnitude of the lateral wind at each forecast time and line segment by iterative calculation of each integral time step within the numerical weather forecast time. When the predicted lateral wind is greater than the wind protection parameter designed for the line, the present invention can issue a refined gale warning in a timely manner, providing a strong guarantee for the safe operation of the transmission line.

[0019] The present invention combines the basic information of overhead transmission lines with conventional data of numerical weather forecasts, and constructs a lateral wind prediction model for overhead transmission lines through the steps of linear interpolation of wind components in meteorology, definition of a coordinated coordinate system, analysis of wind direction and its angle with the line section, etc. This model is not only applicable to the current transmission line network, but also has certain scalability and can adapt to changes and expansions in the future transmission line network.

[0020] In summary, the present invention significantly improves the accuracy and reliability of lateral wind prediction for overhead power transmission lines through innovative wind direction prediction methods, coordinated coordinate system establishment, accurate lateral wind calculation, and refined high wind warning mechanisms, providing a strong guarantee for the safe operation of power transmission lines. At the same time, the model of the present invention has good applicability and scalability, and has broad application prospects. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Coordinate system based on the wind component of numerical weather prediction.

[0022] Figure 2 Coordinate system for coordination of transmission lines and numerical wind farm forecasting.

[0023] Figure 3 Flowchart of the present invention. DETAILED DESCRIPTION

[0024] The present invention is further described below in conjunction with the accompanying drawings: Example 1, please refer to Figure 3 , a method for predicting lateral wind of overhead transmission lines, comprising: Obtain the location and line height information of the overhead transmission line, as well as numerical weather forecast data, and calculate the predicted meridional and zonal winds at the line height; Establish a coordinate system for transmission lines and numerical wind forecasting; Combining the coordinated coordinate system, the meridional and zonal wind data at the line height, and the location information of the overhead transmission line, an analytical model for forecasting wind direction and the direction of the transmission line section is constructed; Based on the analysis model of the predicted wind direction and the direction of the transmission line section, combined with the predicted meridional wind and latitudinal wind at the line height, a lateral wind prediction model for the line section is established to predict the lateral wind of the overhead transmission line.

[0025] The present invention is intended to solve the technical problem that it is difficult to accurately predict the lateral wind for overhead transmission lines. Based on the basic information of overhead transmission lines and high-precision gridded numerical weather forecast data, a scheme is proposed to use linear interpolation to calculate the meridional wind and latitudinal wind predicted at the line height respectively. Based on this, a coordinate system coordinated with the transmission line and the numerical forecast wind field is established, and then an accurate analysis of the predicted wind direction and the direction of the transmission line section is carried out. Finally, a lateral wind size prediction model for the line section is established, and iterative calculations are performed at each integral time step. When the lateral wind is greater than the line section and time of the design parameters, a refined high wind warning is issued. The present invention significantly improves the prediction accuracy of the lateral wind speed, which not only helps to reduce structural damage and failures of transmission lines, but also effectively improves the efficiency and safety of power grid operations. The invention aims to achieve accurate prediction of lateral wind speed and provide solid technical support and guarantee for the safe operation of transmission lines and equipment protection.

[0026] Example 2, please refer to Figure 1 to Figure 2 The present invention provides a method for predicting lateral wind of overhead transmission lines, which specifically includes: Step 1: Obtain basic information of overhead transmission lines and conventional numerical weather forecast data. The basic information of transmission lines includes the longitude of each tower at each level of the line. ,latitude , Line height The system also establishes a matching relationship between the longitude and latitude of the tower and the high-precision gridded numerical weather forecast data, and extracts the conventional data of the numerical weather forecast at the corresponding grid points of the transmission line, including the meridional wind speed at heights of 10 meters, 100 meters, and 200 meters. and zonal wind .

[0027] Step 2: Calculate the predicted meridional and zonal winds at the line height. The wind speed at the height of the transmission line is currently obtained by interpolating the synthetic wind speeds at different levels. However, the terrain of the transmission line is complex, the wind speed may change in many ways in the vertical direction, and the wind direction is a nonlinear function. The synthetic wind speed interpolation will lead to misjudgment of the wind direction. In order to solve the above problems and maintain consistency and compatibility with numerical forecast data, a method of interpolating the wind components separately is proposed, which can not only effectively solve the change of wind speed with height, but also avoid the error caused by synthetic wind speed interpolation, and also ensure the accuracy of wind direction.

[0028] Step 3: Establish a coordinate system that coordinates the transmission line and the numerical wind forecast. The calculation of the lateral wind facing the transmission line involves the analysis of multiple angles, such as the line section direction, wind direction, and the angle between the line section direction and wind direction. In addition, the numerical wind forecast is based on the longitudinal wind direction. and zonal wind The wind direction is composed of two components, and the angle of the wind direction is defined as the direction of the wind, which is not in the same coordinate system as the angle of the transmission line. In order to coordinate the subsequent various angle analyses and simplify the calculation, it is proposed to establish a coordinate system based on the numerical forecast wind component.

[0029] Step 4: Analytical model of predicted wind direction and transmission line segment orientation based on coordinated coordinate system. Based on the new coordinate system specified in step 3, calculate the corresponding wind direction angle according to the meridional wind and zonal wind data at the line height calculated in step 2. Calculate the line segment orientation angle between adjacent towers according to the longitude and latitude of adjacent towers extracted in step 1, and ensure that the calculated angle value is within the interval [0,360].

[0030] Step 5: Establish a prediction model for the lateral wind size facing the line segment. The meridional wind and zonal wind at the height of the transmission line calculated in step 2 are used to obtain the composite wind speed at that height. Based on step 4, the angle between the predicted wind direction and the direction of the line segment is calculated, and the calculated angle value is ensured to be within the range of [0,180]. The lateral wind size is calculated based on the composite wind speed and the angle between the line and the wind direction.

[0031] Step 6: Carry out lateral wind forecasts for each line section at each forecast time. Based on the lateral wind model in step 5, iterative lateral wind calculations are carried out for each tower at each forecast time for the transmission line. The calculated lateral wind is compared with the wind protection parameters of the line design. When the lateral wind is greater than the design parameters for the line section and time, a refined gale warning is issued.

[0032] Further, step 1 specifically includes: Step 1-1: Obtain the basic information of the transmission line towers under study, including the longitude of the transmission line towers at each level. ,latitude , and the height of the transmission line segment It should be noted that the longitude and latitude of the tower and the height of the line segment are actually an array, because a line contains multiple towers, and a line segment is determined between two adjacent towers. However, in order to simplify the description of the prediction model and facilitate understanding, they are simply recorded as a variable in the present invention, and can be expanded into an array structure in actual application.

[0033] Step 1-2: Extract the conventional data of the numerical weather forecast for the grid corresponding to the line segment. Based on the grid numerical weather forecast covering the transmission line, according to the longitude and latitude information of the line tower in step 1-1, establish the matching relationship between each line segment and the numerical weather forecast grid, and extract the conventional data of the corresponding grid points from the numerical weather forecast results. The current mainstream numerical forecast model includes the meridional wind and zonal wind at 10 meters, 100 meters, and 200 meters above the ground in the near-ground layer wind field forecast, which are recorded as , , , , and It should also be noted that the wind speeds at different levels are actually an array, and the size of the array depends on the integral time step and forecast validity of the numerical weather forecast. In other words, these conventional forecast data are included in each integral time step of the numerical forecast. However, for simplicity, they are simply recorded as a variable in the present invention. In actual application, they can be expanded into an array structure according to the results of the numerical forecast.

[0034] Further, step 2 specifically includes: Step 2-1: Construct an interpolation calculation model for the meridional wind and the zonal wind. Accurate prediction of the lateral wind facing the transmission line requires not only accurate wind speed at the height of the transmission line, but also accurate prediction of the wind direction angle. Therefore, various interpolation methods based on synthetic wind speed in the past are not applicable. The present invention proposes interpolation calculation schemes for the meridional wind and the zonal wind respectively, which ensures the accuracy of the wind direction while obtaining the meridional wind and the zonal wind at the height of the line. The present invention uses a linear interpolation method to calculate the wind component at the height of the transmission line, as shown in formula (1): (11.) in, Indicates the height of the transmission line The wind component at a location, namely the meridional wind or the zonal wind. and Two known heights and The wind quantity at the location.

[0035] Step 2-2: Interpolate and calculate the meridional wind and zonal wind at the line segment. According to the different heights of each line segment, the meridional wind and zonal wind at the line height are calculated according to the model in step 2-1. The specific calculation is shown in formula (2): (12.) in, and Transmission line height The meridional and zonal winds. and Two known heights and The same applies to the meridian wind. and The two known heights are and In the present invention, the known heights are 10 meters, 100 meters and 200 meters, and the corresponding meridional wind and zonal wind have been obtained in step 1-2. It is only necessary to calculate the corresponding meridional wind according to the height of the transmission line. By selecting the two closest known heights, the meridional wind and zonal wind of the line segment can be calculated using formula (2).

[0036] Further, step 3 specifically includes: Step 3-1: Establish a coordinate system based on the wind component of numerical weather forecast. The wind component based on numerical weather forecast, i.e., the meridional wind and zonal wind , establish the coordinate system calculated by the present invention. The details are as follows: and zonal wind Orthogonal, meridian wind is the wind component along the longitude of the Earth, the zonal wind It is the wind component along the latitude of the earth. In addition, for the convenience of calculation coordination and application scenario understanding, the wind direction is agreed to be the direction of the wind. The wind direction arrow points to the north at 0°, and moves clockwise. When the wind direction arrow points to the east, it is 90°. For details, see Figure 1 As shown in the figure, when the wind direction is 0°, ; When the wind direction is 90°, ; and so on.

[0037] Step 3-2: Establish a coordinate system for the transmission line and the numerical weather forecast wind field. Based on the coordinate system of the numerical weather forecast wind component established in step 3-1, place the longitude and latitude information of the transmission line tower on the wind component coordinate system and specify the longitude Changes on the horizontal axis of the coordinate system, latitude When the longitude and latitude changes of adjacent towers are used to represent the line direction, the values ​​of the longitude and latitude changes and the related angles are consistent with those in step 3-1. Figure 2 As shown, it can be found from the figure that the concepts of wind direction angle and line segment direction angle are mutually alternate angles. It can be seen that the coordinate system proposed in the present invention well unifies and coordinates the wind direction and the line segment direction, which will greatly simplify the subsequent analysis and calculation process.

[0038] Further, step 4 specifically includes: Step 4-1: Calculate the wind direction at the line height based on the wind component coordinate system. The transmission line height calculated in step 2-2 Meridional wind and zonal wind ,Depend on Figure 1 It can be seen that the wind direction corresponding to the line height is for: (13.) in, is the inverse tangent function.

[0039] Step 4-2: Calculate the direction of each line segment based on the wind component coordinate system. Suppose any line segment By the tower and Composed of towers The longitude and latitude coordinates of Tower The longitude and latitude coordinates of .Depend on Figure 2 It can be seen that the line segment Trend for: (14.) in, is the inverse tangent function, Represents the change in longitude of the line segment, is the dimensional change of the line segment, which can be calculated from the longitude and latitude coordinates of the towers at both ends of the line segment.

[0040] Step 4-3: Convert the wind direction angle and the line segment strike angle to the interval [0,360]. From the calculation of the wind direction angle and the line segment strike angle in steps 4-1 and 4-2, we know that their value range is , in order to adjust the value to In between, introduce the four-quadrant inverse tangent function Calculate the angle: (15.) in, Taking into account the changes in the four quadrants, the value range of the function becomes On this basis, by adjusting the value range and the conversion between radians and angles, the angle is made to fall between The specific interval is as shown in formula (6): (16.) in, The result is in radians, multiplied by It is converted to an angle.

[0041] Further, step 5 specifically includes: Step 5-1: Calculation of synthetic wind speed at the transmission line height. The transmission line height calculated in step 2-2 Meridional wind and zonal wind , the size of the composite wind speed can be calculated based on its orthogonality: (17.) Step 5-2: Calculate the angle between the transmission line section and the wind direction. The wind direction angle can be obtained from step 4. and transmission line section strike angle , and their values ​​are adjusted In the same coordinate system, the angle α between the two can be directly calculated as: (18.) Since the wind direction angle and the line segment strike angle are both calculated clockwise from the north, the angle between the two needs to be adjusted to Within the range, specifically: (19.) Step 5-3: Calculation of the lateral wind force facing the transmission line. Based on the synthetic wind speed and angle obtained in steps 5-1 and 5-2, the lateral wind force on the transmission line section can be accurately calculated. Size: (20.) Further, step 6 specifically includes: Step 6-1: Double-loop iteration of lateral wind forecasting in time and space. Based on the lateral wind model in step 5, double-loop iterations in time and space are performed for each integral time step of the numerical weather forecast and each line segment of the transmission line to calculate the lateral wind results for each tower iteration at each forecast time.

[0042] Step 6-2: Transmission line lateral wind forecast for tower level and minute level. Based on the lateral wind results calculated by step 6-1, the wind protection parameters of the line design are compared. When the lateral wind is greater than the design parameters, a refined gale warning will be issued for the line section and the integral time step.

[0043] The present invention is based on the basic information of overhead transmission lines and the numerical weather forecast data matched thereto. First, linear interpolation is used to respectively calculate the meridional wind and latitudinal wind predicted at the line height, thereby avoiding the nonlinear error of calculating the wind direction by synthetic wind speed interpolation. Then, based on the wind component at the line height, a coordinate system coordinated with the numerical forecast wind field is established to accurately analyze the wind direction and the direction of the transmission line segment. Then, based on the analysis of the angle between the wind direction and the direction of the line segment, a lateral wind size prediction model for the line segment is established. Finally, by iterative calculation of each integral time step within the numerical forecast time, the lateral wind forecast within the forecast period is obtained by comparing with the design parameters. The present invention combines the basic information of overhead transmission lines with the conventional data of numerical weather forecasts. Through the steps of linear interpolation of wind components in meteorology, definition of a coordinated coordinate system, and analysis of wind direction and its angle with the direction of the line segment, a lateral wind prediction model for overhead transmission lines is constructed, which perfectly solves the current technical problems, is more in line with the actual situation, and has higher model prediction accuracy.

[0044] In yet another embodiment of the present invention, a system for predicting lateral wind on an overhead transmission line is provided, which can be used to implement the above-mentioned method for predicting lateral wind on an overhead transmission line. Specifically, the system includes: A data acquisition module is used to obtain the location and line height information of the overhead transmission line, as well as numerical weather forecast data, and calculate the predicted meridional wind and zonal wind at the line height; A coordinate system building module is used to establish a coordinate system that coordinates the transmission line and the numerical wind forecasting field; An analysis model building module is used to build an analysis model for forecasting wind direction and transmission line segment direction by combining the coordinated coordinate system, the meridional wind and zonal wind data at the line height, and the location information of the overhead transmission line; The prediction module is used to establish a lateral wind prediction model for the line section based on the analysis model of the predicted wind direction and the direction of the transmission line section, combined with the predicted longitudinal wind and latitudinal wind at the line height, to predict the lateral wind of the overhead transmission line.

[0045] The division of modules in the embodiments of the present invention is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present invention may be integrated into one processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules.

[0046] In another embodiment of the present invention, a computer device is provided, the computer device including a processor and a memory, the memory is used to store a computer program, the computer program includes program instructions, and the processor is used to execute the program instructions stored in the computer storage medium. The processor may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc., which are the computing core and control core of the terminal, which are suitable for implementing one or more instructions, and are specifically suitable for loading and executing one or more instructions in the computer storage medium to implement the corresponding method flow or corresponding function; the processor described in the embodiment of the present invention can be used for the operation of a method for predicting lateral wind of overhead transmission lines.

[0047] In another embodiment of the present invention, the present invention further provides a storage medium, specifically a computer-readable storage medium (Memory), which is a memory device in a computer device for storing programs and data. It is understandable that the computer-readable storage medium here can include both built-in storage media in the computer device and, of course, extended storage media supported by the computer device. The computer-readable storage medium provides a storage space, which stores the operating system of the terminal. In addition, one or more instructions suitable for being loaded and executed by the processor are also stored in the storage space, and these instructions can be one or more computer programs (including program codes). It should be noted that the computer-readable storage medium here can be a high-speed RAM memory or a non-volatile memory, such as at least one disk memory. The processor can load and execute one or more instructions stored in the computer-readable storage medium to implement the corresponding steps of a method for predicting lateral wind of an overhead transmission line in the above embodiment.

[0048] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0049] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks 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 produce 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.

[0050] 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.

[0051] 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 The steps for the functions specified in one or more boxes.

[0052] 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 predicting lateral wind of overhead transmission lines, characterized in that: include: Obtain the location and line height information of the overhead transmission line, as well as numerical weather forecast data, and calculate the predicted meridional and zonal winds at the line height; Establish a coordinate system for transmission lines and numerically predicted wind farms; Combining the coordinated coordinate system, the meridional and zonal wind data at the line height, and the location information of the overhead transmission line, an analytical model for forecasting wind direction and the direction of the transmission line section is constructed; Based on the analysis model of the predicted wind direction and the direction of the transmission line section, combined with the predicted meridional wind and latitudinal wind at the line height, a lateral wind prediction model for the line section is established to predict the lateral wind of the overhead transmission line.

2. A method for predicting lateral wind of overhead transmission lines according to claim 1, characterized in that: The obtaining of the location and line height information of the overhead transmission line and numerical weather forecast data includes: The location and line height information of the overhead transmission line includes the longitude x and latitude y of the transmission line towers at each level, and the height h of the transmission line section; Extract the conventional data of numerical weather forecast for the grid corresponding to the line segment: Based on the gridded numerical weather forecast covering the transmission line, according to the longitude and latitude information of the line towers, establish a matching relationship between each line segment and the numerical weather forecast grid, and extract the conventional data of the corresponding grid points from the numerical weather forecast results.

3. The method for predicting lateral wind of an overhead transmission line according to claim 1, characterized in that: The calculation of the meridional wind and zonal wind forecast at the line height includes: The linear interpolation method is used to calculate the wind component at the height of the transmission line, as shown in formula (1): （1） in, Indicates the height of the transmission line The wind component at the location, i.e., meridional wind or zonal wind; and Two known heights and The wind force at The meridional wind and zonal wind at the line segment are interpolated and calculated respectively. According to the different heights of each line segment, the meridional wind and zonal wind at the line height are calculated respectively. The specific calculation is shown in formula (2): （2） in, and Transmission line height Meridional and zonal winds at and Two known heights and The meridian wind, and The two known heights are and The zonal wind.

4. The method for predicting lateral wind of an overhead transmission line according to claim 1, characterized in that: The establishment of a coordinate system for coordinating the transmission line with the numerical wind forecasting field includes: Wind components based on numerical weather forecasts, i.e. meridional wind and zonal wind , establish the coordinate system for calculation, as follows: Meridional wind and zonal wind Orthogonal, meridian wind is the wind component along the longitude of the Earth, the zonal wind The wind direction is the direction of the wind. The wind direction arrow points to the north at 0°, and moves clockwise. When the wind direction arrow points to the east at 90°, the wind direction is 0°. ; When the wind direction is 90°, ; Based on the coordinate system of the wind component of numerical weather forecast, the longitude and latitude information of the transmission line tower is placed on the wind component coordinate system, and the longitude is specified. Changes on the horizontal axis of the coordinate system, latitude Changes on the vertical axis of the coordinate system; when the longitude and latitude changes of adjacent towers are used to indicate the direction of the line, the wind direction is agreed to be the direction of the wind. The wind direction arrow points to the north at 0°, and moves clockwise. When the wind direction arrow points to the east, it is 90°. When the wind direction is 0°, ; When the wind direction is 90°, .

5. The method for predicting lateral wind of an overhead transmission line according to claim 1, characterized in that: The method combines the coordinated coordinate system, the meridional wind and zonal wind data at the line height, and the location information of the overhead transmission line to construct an analysis model for predicting wind direction and transmission line section direction, including: The wind direction at the line height is calculated based on the wind component coordinate system, and the transmission line height is calculated by Meridional wind and zonal wind , the wind direction corresponding to the line height for: （3） in, is the inverse tangent function; Based on the wind component coordinate system, the direction of each line segment is calculated. By the tower and Composed of towers The longitude and latitude coordinates of Tower The longitude and latitude coordinates of ; Line segment Trend for: （4） in, is the inverse tangent function, Represents the change in longitude of the line segment, is the dimensional change of the line segment, which can be calculated from the longitude and latitude coordinates of the towers at both ends of the line segment; Convert the wind direction angle and line segment strike angle to the interval [0,360] and introduce the four-quadrant inverse tangent function Calculate the angle: （5） in, , so that the function range becomes On this basis, by adjusting the value range and the conversion between radians and angles, the angle is made to fall between The specific interval is as shown in formula (6): （6） in, The result is returned in radians, multiplied by It is converted to an angle.

6. A method for predicting lateral wind of overhead transmission lines according to claim 5, characterized in that: The analysis model based on the predicted wind direction and the direction of the transmission line section is combined with the predicted meridional wind and zonal wind at the line height to establish a lateral wind magnitude prediction model facing the line section, including: The calculation of the synthetic wind speed at the transmission line height is based on the calculated transmission line height Meridional wind and zonal wind , calculate the size of the composite wind speed based on its orthogonality: （7） The calculation of the angle between the transmission line section and the wind direction is based on the wind direction angle and transmission line section strike angle , and their values ​​are adjusted Within the interval, in the same coordinate system, the angle α between the transmission line section and the wind direction is calculated as: （8） The transmission line section direction and wind direction angle are adjusted to Within the range, specifically: （9） The calculation of the lateral wind size facing the transmission line is based on the synthetic wind speed and the angle between the transmission line section and the wind direction. Size: （10）。 7. A method for predicting lateral wind of overhead transmission lines according to claim 6, characterized in that: The method of predicting the lateral wind of overhead transmission lines comprises: The lateral wind prediction for time and space dual-loop iteration is based on the lateral wind model. For each integral time step of the numerical weather forecast and each line section of the transmission line, a time and space dual-loop iteration is carried out to calculate the lateral wind results for each tower iteration at each forecast time. For the tower-level and minute-level lateral wind forecast of transmission lines, the lateral wind results calculated at each integral time step and tower-by-tower iteration are judged against the wind protection parameters of the line design. When the lateral wind is greater than the design parameters, a refined high wind warning will be issued for the line section and integral time step.

8. An overhead transmission line lateral wind prediction system, characterized in that: include: A data acquisition module is used to obtain the location and line height information of the overhead transmission line, as well as numerical weather forecast data, and calculate the predicted meridional wind and zonal wind at the line height; A coordinate system building module is used to establish a coordinate system that coordinates the transmission line and the numerical wind forecasting field; An analysis model building module is used to build an analysis model for forecasting wind direction and transmission line segment direction by combining the coordinated coordinate system, the meridional wind and zonal wind data at the line height, and the location information of the overhead transmission line; The prediction module is used to establish a lateral wind prediction model for the line section based on the analysis model of the predicted wind direction and the direction of the transmission line section, combined with the predicted longitudinal wind and latitudinal wind at the line height, to predict the lateral wind of the overhead transmission line.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the method for predicting lateral wind of an overhead transmission line as claimed in any one of claims 1 to 7 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of a method for predicting lateral wind of an overhead transmission line as claimed in any one of claims 1 to 7 are implemented.

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