CN118568998B - Method, device, equipment, storage medium and program product for determining lightning protection measures of power transmission line - Google Patents

Abstract

The present application relates to a method, device, equipment, storage medium and program product for determining lightning protection measures for a transmission line. The method includes: obtaining line characteristic parameters of a transmission line; the line characteristic parameters include an initial value of grounding resistance, an initial value of insulator string length, an initial value of pole tower height and an initial value of lightning conductor protection angle; according to the line characteristic parameters, a first lightning trip rate is determined, and when the first lightning trip rate does not meet a preset condition, the line characteristic parameters are optimized, and at least one second lightning trip rate is determined according to the optimized line characteristic parameters. According to the first lightning trip rate and each second lightning trip rate, a target lightning protection measure is determined; the target lightning protection measure includes a target value of each parameter in the line characteristic parameter. By adopting the present application, the accuracy of determining lightning protection measures for transmission lines can be improved.

Description

Method, device, equipment, storage medium and program product for determining lightning protection measures of power transmission line

Technical Field

The application relates to the technical field of lightning protection of power transmission lines, in particular to a method, a device, equipment, a storage medium and a program product for determining lightning protection measures of power transmission lines.

Background

The transmission line is a basic component of the power grid, and the safe operation of the transmission line has important significance for the safety of the power grid. The topography of the power transmission corridor is quite complex, the passing landform and the meteorological conditions are extremely diversified, the safe operation and maintenance of the power transmission corridor are greatly threatened by lightning damage, and the safe and stable operation of the power transmission line in the area is greatly influenced. Therefore, how to determine and optimize the lightning protection measures of the power transmission line is of great importance to the power transmission line.

In the related art, lightning protection optimization measures are usually analyzed according to manual experience so as to determine the lightning protection measures of the power transmission line, but the lightning protection measures are determined by relying on manual analysis, so that the problem of low accuracy may exist.

Disclosure of Invention

In view of the foregoing, it is desirable to provide a lightning protection measure determining method, apparatus, device, storage medium, and program product for a power transmission line that can improve the accuracy of determining the lightning protection measure for the power transmission line.

In a first aspect, the present application provides a method for determining lightning protection measures of a power transmission line, where the method includes:

acquiring line characteristic parameters of a power transmission line; the line characteristic parameters comprise an initial value of a grounding resistance, an initial value of the length of an insulator string, an initial value of the height of a pole tower and an initial value of a protection angle of a lightning conductor;

determining a first lightning trip-out rate according to the line characteristic parameters;

under the condition that the first lightning trip-out rate does not meet the preset condition, optimizing the line characteristic parameters, and determining at least one second lightning trip-out rate according to the optimized line characteristic parameters;

Determining a target lightning protection measure according to the first lightning trip-out rate and each second lightning trip-out rate; the target lightning protection measures include target values for each of the line characteristic parameters.

In one embodiment, determining the target lightning protection measure based on the first lightning trip-out rate and each of the second lightning trip-out rates includes:

Determining lightning protection measure gradient data according to the first lightning trip-out rate and each second lightning trip-out rate;

Obtaining intermediate values of parameters corresponding to the intermediate lightning protection measures according to the lightning protection measure gradient data, updating the line characteristic parameters according to the intermediate values of the parameters, and returning to execute the step of determining the first lightning trip-out rate according to the line characteristic parameters until the preset condition is met;

And determining the target lightning protection measures according to the intermediate values of the parameters meeting the preset conditions.

In one embodiment, determining lightning protection measure gradient data from the first lightning trip-out rate and each of the second lightning trip-out rates includes:

Determining lightning trip-out change rates corresponding to the second lightning trip-out rates according to the first lightning trip-out rates and the second lightning trip-out rates;

and determining lightning protection measure gradient data according to the trip change rate of each lightning stroke.

In one embodiment, the method further comprises:

Determining a lightning strike risk level corresponding to the first lightning strike tripping rate;

Under the condition that the lightning strike risk level is larger than the risk level threshold value, the optimization times of lightning protection measures are obtained;

and under the condition that the optimization times are smaller than the optimization times threshold value, determining that the first lightning trip-out rate does not meet the preset condition.

In one embodiment, optimizing the line characteristic parameter and determining at least one second lightning trip-out rate according to the optimized line characteristic parameter comprises:

determining target parameters to be optimized according to initial values of parameters in the line characteristic parameters and corresponding parameter thresholds; the initial value of the target parameter is smaller than the corresponding parameter threshold value;

optimizing an initial value of the target parameter to obtain an optimized line characteristic parameter;

and determining a second lightning trip-out rate of each target parameter according to the optimized line characteristic parameters.

In one embodiment, determining the target parameter to be optimized according to the initial value of each parameter in the line characteristic parameters and the corresponding parameter threshold value includes:

Determining a reference interval of each parameter in the line characteristic parameters;

Normalizing the initial values of the parameters in the line characteristic parameters according to the reference interval of the parameters in the line characteristic parameters to obtain normalized line characteristic parameters;

and determining the target parameter to be optimized according to the value of each parameter in the normalized line characteristic parameters and the corresponding parameter threshold value.

In one embodiment, the method further comprises:

acquiring a ground inclination angle initial value and a ground flash density initial value;

and determining the lightning defect proportion and/or the lightning risk degree according to the initial ground inclination angle, the initial ground flash density, the initial ground resistance, the initial insulator string length, the initial pole height and the initial lightning protection angle.

In a second aspect, the present application provides a lightning protection measure determining apparatus for a power transmission line, the apparatus comprising:

The acquisition module is used for acquiring line characteristic parameters of the power transmission line; the line characteristic parameters comprise an initial value of a grounding resistance, an initial value of the length of an insulator string, an initial value of the height of a pole tower and an initial value of a protection angle of a lightning conductor;

The first determining module is used for determining a first lightning trip-out rate according to the line characteristic parameters;

the optimizing module is used for optimizing the line characteristic parameters under the condition that the first lightning trip-out rate does not meet the preset condition, and determining at least one second lightning trip-out rate according to the optimized line characteristic parameters;

the second determining module is used for determining target lightning protection measures according to the first lightning trip-out rate and each second lightning trip-out rate; the target lightning protection measures include target values for each of the line characteristic parameters.

In a third aspect, the present application provides a lightning protection measure determining apparatus for a power transmission line, the lightning protection measure determining apparatus comprising a memory and a processor, the memory storing a computer program, the processor executing the computer program to perform the steps of the method of the first aspect described above.

In a fourth aspect, the present application provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of the method of the first aspect described above.

In a fifth aspect, the application also provides a computer program product comprising a computer program which, when executed by a processor, implements the steps of the method of the first aspect described above.

The method, the device, the equipment, the storage medium and the program product for determining the lightning protection measures of the power transmission line are realized by acquiring the line characteristic parameters of the power transmission line; and determining a first lightning trip-out rate according to the line characteristic parameters. And under the condition that the first lightning trip-out rate does not meet the preset condition, optimizing the line characteristic parameters, and determining at least one second lightning trip-out rate according to the optimized line characteristic parameters. Further, a target lightning protection measure is determined based on the first lightning trip-out rate and each of the second lightning trip-out rates. Compared with the mode of determining lightning protection measures according to manual experience in the related art, the embodiment of the application can directly influence the lightning resistance level and the lightning trip-out rate of the power transmission line by acquiring key parameters such as the initial value of the grounding resistance, the initial value of the length of the insulator string, the initial value of the height of the pole tower, the initial value of the protection angle of the lightning conductor and the like, and provides basic data for subsequent lightning protection performance analysis and optimization. Considering that the lightning trip-out rate is an important index for measuring the lightning protection performance of the power transmission line, the lightning protection performance of the current line can be primarily estimated by obtaining the first lightning trip-out rate based on the initial line characteristic parameters in the embodiment of the application. Further, when the first lightning trip-out rate does not meet the preset condition, the lightning-proof level of the power transmission line can be improved by optimizing the line characteristic parameters (such as reducing the ground resistance, adjusting the length of the insulator string, changing the height of the tower or adjusting the protection angle of the lightning conductor, etc.). After the characteristic parameters of the power transmission line are optimized, at least one second lightning trip rate is calculated again, and a final target lightning protection measure can be determined through the first lightning trip rate and the second lightning trip rate, so that the accuracy of the lightning protection measure of the power transmission line can be improved, the power transmission line can still keep a lower lightning trip rate under the condition of frequent lightning activities, and the reliability and the economy of the power transmission line are improved.

Drawings

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the related art, the drawings that are required to be used in the embodiments or the related technical descriptions will be briefly described, and it is apparent that the drawings in the following description are only some embodiments of the present application, and other drawings may be obtained according to the drawings without inventive effort for those skilled in the art.

Fig. 1 is a flow chart of a method for determining lightning protection measures of a power transmission line according to an embodiment of the present application;

Fig. 2 is a flow chart of a method for determining lightning protection measures of a power transmission line according to another embodiment of the present application;

Fig. 3 is a flow chart of a method for determining lightning protection measures of a power transmission line according to another embodiment of the present application;

Fig. 4 is a flow chart of a method for determining lightning protection measures of a power transmission line according to another embodiment of the present application;

Fig. 5 is a flow chart of a method for determining lightning protection measures of a power transmission line according to another embodiment of the present application;

Fig. 6 is a flow chart of a method for determining lightning protection measures of a power transmission line according to another embodiment of the present application;

fig. 7 is an overall flow chart of a method for determining lightning protection measures of a power transmission line according to an embodiment of the present application;

fig. 8 is a schematic structural diagram of a lightning protection measure determining apparatus for a power transmission line according to an embodiment of the present application;

fig. 9 is an internal structural view of the lightning protection means determining device in one embodiment of the application.

Detailed Description

The present application will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present application more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the application.

The method, the device, the equipment, the storage medium and the program product for determining the lightning protection measures of the power transmission line can be applied to a professional scene for determining the lightning protection measures of the power transmission line; the method and the device can be applied to the scene of determining the lightning protection measures of the power transmission line in other power supply systems, and the embodiment of the application is not limited.

The transmission line is a basic component of the power grid, and the safe operation of the transmission line has important significance for the safety of the power grid. The topography of the power transmission corridor is quite complex, the passing landform and the meteorological conditions are extremely diversified, the safe operation and maintenance of the power transmission corridor are greatly threatened by lightning damage, and the safe and stable operation of the power transmission line in the area is greatly influenced. At present, lightning hazard risk assessment mainly focuses on lightning trip-out rate, and influences of various parameters on the lightning trip-out rate are studied. For example, related studies have shown that differences in lightning activity intensity can lead to different risks of lightning accidents, both in transmission line path topography and line structure. In addition, the parameters of the line itself are also decisive factors for the risk of lightning damage.

In the related art, most of analysis for optimizing lightning protection measures is manual analysis, and the analysis can be divided into the following two methods: the direct impact prevention method is used for preventing the lead from being directly struck by lightning through the methods of erecting the lightning conductor, reducing the protection angle of the lightning conductor, additionally installing the lightning conductor and the like; according to the flashover prevention method, flashover of the power transmission line after lightning strike is prevented by reducing the grounding resistance of the tower, increasing the length of the insulator string and erecting the coupling ground wire. However, because the optimization measures depend on manual analysis, subjective problems exist, and therefore the accuracy of determining the lightning protection measures is low. Therefore, how to accurately determine lightning protection measures is critical to the grid system.

The lightning protection measure determining method of the power transmission line, provided by the embodiment of the application, can be used for lightning protection measure determining equipment, wherein the lightning protection measure determining equipment can be a server or a terminal, the server can be a single server or a server cluster consisting of a plurality of servers, and a data storage system can store line characteristic parameters, a first lightning trip-out rate, a second lightning trip-out rate and the like which need to be processed by the server. The data storage system may be integrated on a server or may be placed on a cloud or other network server. The terminal may be, but is not limited to, various personal computers, notebook computers, smart phones and tablet computer devices; the lightning protection measure determining method of the power transmission line provided by the embodiment of the application can also be applied to a system comprising a terminal and a server, and is realized through interaction of the terminal and the server.

In order to solve the problem of low accuracy of lightning protection measure determination of the power transmission line in the related art, the lightning protection measure determination method, device, equipment, storage medium and program product of the power transmission line provided by the embodiment of the application can directly influence the lightning resistance level and lightning trip rate of the power transmission line by acquiring key parameters such as the initial value of the grounding resistance, the initial value of the length of the insulator string, the initial value of the height of the pole tower, the initial value of the protection angle of the lightning conductor and the like, and provide basic data for subsequent lightning protection performance analysis and optimization. Considering that the lightning trip-out rate is an important index for measuring the lightning protection performance of the power transmission line, the lightning protection performance of the current line can be primarily estimated by obtaining the first lightning trip-out rate based on the initial line characteristic parameters in the embodiment of the application. Further, when the first lightning trip-out rate does not meet the preset condition, the lightning-proof level of the power transmission line can be improved by optimizing the line characteristic parameters (such as reducing the ground resistance, adjusting the length of the insulator string, changing the height of the tower or adjusting the protection angle of the lightning conductor, etc.). After the characteristic parameters of the power transmission line are optimized, at least one second lightning trip rate is calculated again, and a final target lightning protection measure can be determined through the first lightning trip rate and the second lightning trip rate, so that the accuracy of the lightning protection measure of the power transmission line can be improved, the power transmission line can still keep a lower lightning trip rate under the condition of frequent lightning activities, and the reliability and the economy of the power transmission line are improved.

In one embodiment, fig. 1 is a schematic flow chart of a lightning protection measure determining method of a power transmission line according to one embodiment of the present application, where in the embodiment of the present application, an example of lightning protection measure determining equipment applied to the power transmission line by using the method is described, where the lightning protection measure determining equipment of the power transmission line may be a server. As shown in fig. 1, the method of the embodiment of the present application may include the following steps.

S201, obtaining line characteristic parameters of the power transmission line.

Illustratively, the line characteristic parameter refers to a parameter describing physical and electrical characteristics of the transmission line; the line characteristic parameters may include, but are not limited to, an initial value of ground resistance, an initial value of insulator string length, an initial value of tower height, and an initial value of lightning protection angle.

The initial value of the grounding resistance refers to the resistance value of a power transmission line grounding system (such as a grounding electrode, a grounding grid and the like) in an initial state; the initial value of the length of the insulator string is the length of the insulator string, which is used for supporting the wire and preventing the wire from being in direct contact with the pole tower, on the power transmission line in an initial state; the initial value of the tower height refers to the height of a tower supporting a wire and an insulator string in a power transmission line in an initial state; the initial value of the protection angle of the lightning conductor refers to the value of the angle between the lightning conductor (also called overhead ground wire) and the conductor in the initial state.

The line characteristic parameters may be an initial value of the ground resistance, an initial value of the length of the insulator string, an initial value of the height of the tower, and an initial value of the protection angle of the lightning conductor, or may be normalized values of the ground resistance, the length of the insulator string, the height of the tower, and the protection angle of the lightning conductor, which are not limited.

In the step, the lightning protection measure determining device can acquire the line characteristic parameters of the power transmission line according to a preset acquisition mode, and important data basis is provided for the formulation and optimization of the lightning protection measure by accurately acquiring the line characteristic parameters.

Optionally, the acquiring manner of the line characteristic parameters of the power transmission line may be through professional measuring equipment and tools, performing on-site measurement on each characteristic parameter of the line, or consulting an initial value of the line characteristic parameters from a preset database, which is not limited.

S202, determining a first lightning trip-out rate according to the line characteristic parameters.

The first lightning trip-out rate refers to the probability of a tripping event of the power transmission line under the condition of lightning.

In the step, the lightning protection measure determining device can input the line characteristic parameters into a preset lightning trip-out model according to the line characteristic parameters to obtain a first lightning trip-out rate.

The lightning protection measure determining equipment can accurately calculate the lightning trip-out rate of the power transmission line under specific conditions according to the actual line characteristic parameters, thereby providing scientific basis for the determination of the follow-up lightning protection measure.

The preset lightning trip-out model is illustratively a calculation model based on statistical data and mathematical methods for predicting the lightning trip-out rate from line characteristic parameters of the transmission line. Through inputting line characteristic parameters, the model can calculate the corresponding lightning trip rate, and provide a quantization basis for the determination of lightning protection measures. In practical application, a preset lightning trip-out model can be adjusted and optimized according to specific power transmission line conditions and lightning protection requirements so as to improve accuracy and applicability of the lightning trip-out model.

And S203, optimizing the line characteristic parameters under the condition that the first lightning trip-out rate does not meet the preset condition, and determining at least one second lightning trip-out rate according to the optimized line characteristic parameters.

The preset condition may include that the lightning strike risk level is less than or equal to the risk level threshold, or the preset condition may include that the lightning strike risk level is less than or equal to the risk level threshold, and the optimization frequency of the lightning protection measure is not less than the optimization frequency threshold, which may be adjusted according to actual experience and conditions, and the method is not limited.

Illustratively, optimizing the line characteristic parameter refers to adding a preset increment to the line characteristic parameter to be optimized to obtain the optimized line characteristic parameter. Or optimizing the line characteristic parameters means that the line characteristic parameters to be optimized are multiplied by a preset coefficient to obtain the optimized line characteristic parameters.

In this step, under the condition that the first lightning trip-out rate does not meet the preset condition, the lightning protection measure determining device may increase the line characteristic parameter to be optimized by a preset increment, obtain the optimized line characteristic parameter, and determine at least one second lightning trip-out rate according to the optimized line characteristic parameter.

Therefore, when the preset condition is not met, the lightning protection measure determining device can perform iterative optimization on the characteristic parameters of the circuit, so that effective lightning protection measures and parameter setting can be found more accurately, the lightning trip rate can be reduced, power interruption and equipment damage caused by lightning stroke are reduced, and the stability and reliability of a power system are improved.

S204, determining target lightning protection measures according to the first lightning trip-out rate and each second lightning trip-out rate.

The target lightning protection measures can include, but are not limited to, target values of parameters in the line characteristic parameters.

Hereinafter, determination of the target lightning protection measures based on the first lightning trip-out rate and each of the second lightning trip-out rates will be exemplarily explained.

In one possible implementation, the lightning protection measure determining device may determine lightning protection measure gradient data according to the first lightning trip-out rate and each second lightning trip-out rate; and determining the target lightning protection measure according to the lightning protection measure gradient data.

In the implementation mode, the lightning protection measure determining equipment can intuitively know the influence degree of different lightning protection measures on the lightning trip-out rate by calculating the lightning protection measure gradient data, find the optimization direction with the largest lightning trip-out rate change degree, and select the comprehensive measures according to the gradient, so that the most efficient optimization effect can be achieved.

In another possible implementation manner, the lightning protection measure determining device may input the first lightning trip-out rate and each second lightning trip-out rate into a preset trained neural network based on the trained neural network model, and output one or more lightning protection measures, so as to determine the target lightning protection measure.

In the implementation manner, with the accumulation of new data and experience, the lightning protection measure determining device can continuously train and optimize the neural network model, and the accuracy of prediction and recommendation of the neural network model is improved. Through a large amount of training data, the neural network model can learn the complex relation between the lightning trip rate and the lightning protection measures, so that effective lightning protection measures can be predicted and recommended more accurately.

Thus, by any of the above implementations, the target lightning protection measure may be determined based on the first lightning trip-out rate and each of the second lightning trip-out rates.

In the lightning protection measure determining method of the power transmission line, the lightning protection measure determining device can acquire the line characteristic parameters of the power transmission line and determine the first lightning trip-out rate according to the line characteristic parameters. Under the condition that the first lightning trip-out rate does not meet the preset condition, the lightning protection measure determining equipment optimizes the line characteristic parameters and determines at least one second lightning trip-out rate according to the optimized line characteristic parameters. Further, the lightning protection measure determining device determines the target lightning protection measure according to the first lightning trip-out rate and each second lightning trip-out rate. Compared with the mode of determining the lightning protection measures according to manual experience in the related art, the lightning protection measure determining device can directly influence the lightning resistance level and the lightning trip rate of the power transmission line by acquiring key parameters such as the initial value of the grounding resistance, the initial value of the length of the insulator string, the initial value of the height of the pole tower, the initial value of the protection angle of the lightning conductor and the like, and provides basic data for subsequent lightning protection performance analysis and optimization. Considering that the lightning trip-out rate is an important index for measuring the lightning protection performance of the power transmission line, the lightning protection measure determining device obtains a first lightning trip-out rate based on the initial line characteristic parameters, and can primarily evaluate the lightning protection performance of the current line. Further, when the first lightning trip-out rate does not meet the preset condition, the lightning protection measure determining device can improve the lightning resistance level of the power transmission line by optimizing the line characteristic parameters (such as reducing the grounding resistance, adjusting the length of the insulator string, changing the height of the tower or adjusting the protection angle of the lightning conductor, etc.). After the characteristic parameters of the line are optimized, the lightning protection measure determining equipment calculates at least one second lightning trip rate again, and the final target lightning protection measure can be determined through the first lightning trip rate and the second lightning trip rate, so that the accuracy of the lightning protection measure of the power transmission line can be improved, the power transmission line can still keep a lower lightning trip rate under the condition of frequent lightning activity, and the reliability and the economy of the power transmission line are improved.

In one embodiment, on the basis of the foregoing embodiment, fig. 2 is a schematic flow diagram of a method for determining lightning protection measures of a power transmission line according to another embodiment of the present application, and in the embodiment of the present application, description is given, by way of example, of the content "determining a target lightning protection measure according to a first lightning trip rate and each second lightning trip rate" in S204 referred to in the foregoing embodiment. The method of the embodiment of the application can comprise the following steps.

S2041, determining lightning protection measure gradient data according to the first lightning trip-out rate and each second lightning trip-out rate.

The extent of influence of the parameters in reducing the lightning trip-out rate is illustratively represented by calculating the rate of change of the lightning trip-out rate before and after taking different lightning protection measures. The extent of this effect is typically quantified by the partial derivatives of the parameters with respect to the lightning trip-out rate, and these partial derivatives are combined into a vector, which may be referred to as lightning protection means gradient data.

In this step, the lightning protection measure determining device may determine lightning protection measure gradient data according to the first lightning trip-out rate and each second lightning trip-out rate. Therefore, the lightning protection measure determining equipment calculates the lightning protection measure gradient data and combines the gradient according to the partial derivative, so that the optimal direction with the maximum variation degree can be found, and the influence degree of different lightning protection measures on the lightning trip-out rate can be intuitively known.

Hereinafter, the description will be given of exemplary explanation of the determination of the contents of the lightning protection measure gradient data based on the first lightning trip-out rate and each of the second lightning trip-out rates.

The lightning protection measure determining device may determine a lightning trip-out rate corresponding to each second lightning trip-out rate according to the first lightning trip-out rate and each second lightning trip-out rate.

Wherein the lightning trip-out change rate is obtained by making a difference between the first lightning trip-out rate and the second lightning trip-out rate.

In this step, the lightning protection measure determining device may determine a lightning trip-out rate corresponding to each second lightning trip-out rate according to the first lightning trip-out rate and each second lightning trip-out rate. It can be seen that the lightning trip-out rate provides a quantified indicator for measuring the extent of the change in lightning trip-out rate after taking the optimization measures, so that the effect of the optimization measures can be intuitively evaluated. By comparing the lightning trip-out change rates under different optimization measures, the optimization measure with the best effect can be selected, and scientific basis is provided for the formulation of lightning protection measures.

Taking the grounding resistance measures in the target lightning protection measures as an example, the lightning trip-out change rate corresponding to the grounding resistance measures can be determined according to the first lightning trip-out rate of the grounding resistance measures and the second lightning trip-out rate of the grounding resistance measures after optimizing parameters. Illustratively, the equation for the lightning trip-out rate of change for a ground resistance measure may be expressed as:

（1）

wherein, Representing a lightning trip-out change rate corresponding to the grounding resistance measures; lightning trip rateIs a function of a plurality of lightning protection parameters.An initial value of the grounding resistance in the current state,An initial value of the length of the insulator string in the current state,An initial value of the height of the tower in the current state,And representing the initial value of the protection angle of the lightning conductor in the current state.Is the amount of change in ground resistance.

Of course, the calculation formula of the lightning trip-out change rate corresponding to the ground resistance measure can also be expressed as other variations of the above formula (1) or an equivalent formula.

It should be understood that the calculation formula of the lightning trip-out change rate corresponding to the insulator string length measure, the calculation formula of the lightning trip-out change rate corresponding to the tower height measure, and the calculation method of the lightning trip-out change rate corresponding to the lightning protection angle measure are similar to the above formula (1), and are not repeated here.

Further, the lightning protection measure determining device may determine lightning protection measure gradient data according to the trip change rate of each lightning stroke.

Wherein, the lightning protection measure determining device may approximate each lightning trip-out change rate as a partial derivative, taking the ground resistance measure as an example, the calculation formula of the lightning trip-out change rate of the ground resistance measure as the partial derivative may be expressed as:

（2）

wherein, Representing the lightning trip-out change rate corresponding to the grounding resistance measures to obtain the limit; and the partial derivative of the grounding resistance measures is represented, namely, the change rate of the lightning trip rate along with the change of the grounding resistance under the condition that the initial value of the length of the insulator string, the initial value of the height of the pole tower and the initial value of the protection angle of the lightning conductor are kept unchanged.

Of course, the calculation formula of the partial derivative of the lightning trip-out change rate of the ground resistance measure can also be expressed as other variations of the above formula (2) or as an equivalent formula.

Further, after the lightning protection measure determining device approximates each lightning trip-out change rate to a partial derivative, each partial derivative is combined to obtain lightning protection measure gradient data.

Illustratively, the lightning protection measure gradient data may be expressed as:

（3）

wherein, And representing lightning protection measure gradient data.

Of course, the calculation formula of the lightning protection measure gradient data can also be expressed as other variants of the above formula (3) or equivalent formulas.

S2042, obtaining intermediate values of parameters corresponding to the intermediate lightning protection measures according to the lightning protection measure gradient data, updating the line characteristic parameters according to the intermediate values of the parameters, and returning to execute the step of determining the first lightning trip-out rate according to the line characteristic parameters until the preset condition is met.

The intermediate lightning protection measures refer to lightning protection measures obtained according to lightning protection measure gradient data under the condition that preset conditions are not met.

The intermediate values of the parameters corresponding to the intermediate lightning protection measures can comprise an intermediate value of a grounding resistance, an intermediate value of an insulator string length, an intermediate value of a pole height and an intermediate value of a lightning protection angle.

Updating the line characteristic parameters according to the intermediate values of the parameters refers to taking the intermediate values of the parameters as the line characteristic parameters.

In the step, the lightning protection measure determining device may calculate, according to the lightning protection measure gradient data, intermediate values of parameters corresponding to the intermediate lightning protection measure, and return to the step of executing S202 with the intermediate values of the parameters as line characteristic parameters until a preset condition is satisfied. Therefore, the lightning protection measure determining equipment can obtain the configuration of the line characteristic parameters with the lowest lightning trip rate through iterative optimization of the lightning protection measure, so that the lightning protection performance of the power system can be remarkably improved.

Illustratively, assuming that the values of the optimized line characteristic parameters are all 0.1, this can be expressed as:

（4）

wherein, Representing the optimized line characteristic parameters adopting the grounding resistance measures; Representing optimized line characteristic parameters adopting insulator string length measures; Representing the optimized line characteristic parameters adopting the tower height measure; and (5) representing the optimized line characteristic parameters adopting the lightning protection angle measures.

Further, the optimized line characteristic parameters are respectively substituted into lightning protection measure gradient data, and the parameters in the lightning protection measure gradient data are connected by partial leads, wherein the simultaneous formula can be expressed as:

（5）

wherein, Representing an intermediate value of the ground resistance in the intermediate lightning protection measure; An intermediate value representing the length of the insulator string in the intermediate lightning protection measure; An intermediate value representing the height of the tower in the intermediate lightning protection measure; and the intermediate value of the lightning protection angle in the intermediate lightning protection measures is represented.

It should be noted that, the intermediate values of the parameters corresponding to the intermediate lightning protection measures may satisfy the following constraints, and may be expressed as:

（6）

wherein, Respectively representing different directions of the grounding resistance parameter, the insulator chain length parameter, the pole tower height parameter and the lightning protection angle parameter in a multiple space.

Further, taking the intermediate value of the grounding resistance in the intermediate lightning protection measure as an example, a calculation formula of the intermediate value of the parameter corresponding to the grounding resistance in the intermediate lightning protection measure can be expressed as:

（7）

It should be noted that, the calculation manner of the intermediate values of the insulator string length, the tower height and the lightning protection angle in the intermediate lightning protection measure is similar to the above formula (7), and will not be described herein.

S2043, determining target lightning protection measures according to intermediate values of parameters meeting preset conditions.

In this step, the lightning protection measure determining apparatus may determine the target lightning protection measure according to the intermediate value of each parameter satisfying the preset condition. Therefore, the target lightning protection measures obtained by the lightning protection measure determining equipment through iterative optimization are optimized based on the influence degree of each parameter on the lightning trip-out rate, so that reasonable configuration and utilization of resources can be ensured, unnecessary waste is avoided, the lightning trip-out rate is reduced, and the lightning protection performance of the power system is improved.

According to the embodiment of the application, the lightning protection measure determining equipment calculates the lightning protection measure gradient data and combines the gradient according to the partial derivative, so that the optimal direction with the maximum variation degree can be found, and the influence degree of different lightning protection measures on the lightning trip-out rate can be intuitively known. The lightning protection measure determining equipment optimizes the lightning protection measure based on the influence degree of each parameter on the lightning trip-out rate through iterative optimization, so that reasonable configuration and utilization of resources can be ensured, unnecessary waste is avoided, the lightning trip-out rate is reduced, and the lightning protection performance of the power system is improved.

In an embodiment, based on the foregoing embodiment, fig. 3 is a schematic flow diagram of a lightning protection measure determining method of a power transmission line according to another embodiment of the present application, and in this embodiment of the present application, a further exemplary description is given of the content related to "determining that the first lightning trip rate does not meet the preset condition" in S203 related to the foregoing embodiment. The method of the embodiment of the application can comprise the following steps.

S401, determining a lightning strike risk level corresponding to the first lightning strike tripping rate.

The lightning strike risk level is used for evaluating and quantifying the risk degree possibly generated after the power transmission line or the facility is struck by lightning.

Hereinafter, the classification of lightning risk classes is exemplarily explained as shown in table 1.

TABLE 1 lightning strike risk ranking

Wherein, The first lightning trip-out rate of the ith tower is expressed in units of sub/(100)) Wherein a represents a year.And representing the actual control reference value of the line lightning trip-out rate.

Optionally, the actual control reference value of the line lightning trip-out rate under different voltage classesThe calculation formula of (2) can be expressed as:

（8）

wherein, Representing the actual flash density of the line corridor in units of sub/(100))；Expressed as line standard control reference values at different voltage levels; the coefficients are used to determine, by way of example, May have a value of 2.78.

The actual ground flash density of a line corridor refers to the number of ground flashes per 100 km of line per year in the area of the line corridor.

Of course, the actual control reference value of the line lightning trip-out rate under different voltage classesThe calculation formula of (2) may also be expressed as other variations of the above formula (8) or as an equivalent formula.

Illustratively, the line lightning trip rate standard control reference values at different voltage levels are different and can be found from table 2.

TABLE 2 lightning trip-out rate standard control reference value

In this step, the lightning protection measure determining device may accurately determine the corresponding lightning strike risk level from tables 1 and 2 according to the first lightning strike tripping rate, and provide a data base for subsequent calculation.

S402, under the condition that the lightning strike risk level is larger than the risk level threshold value, the optimization times of lightning protection measures are obtained.

The risk level threshold is a preset standard, and is used for judging whether the current lightning stroke risk level needs to trigger further lightning protection measures to optimize. For example, the risk level threshold may be a lightning strike risk level ii, and if the lightning strike risk level exceeds the level ii, the risk is considered to be high, and further optimization measures need to be taken to reduce the risk.

The optimization frequency of the lightning protection measures refers to the frequency of current iteration performed for reducing the risk after the lightning strike risk level exceeds a threshold value.

Alternatively, if the lightning strike risk level is not greater than the risk level threshold, all previous comprehensive measures are accumulated as a final overall comprehensive measure.

In the step, under the condition that the lightning strike risk level is larger than the risk level threshold, the lightning protection measure determining device can acquire the optimization times of the lightning protection measure. Therefore, the acquisition of the optimization times of the lightning protection measures can provide an important reference basis for whether to continue to optimize or not, and is beneficial to better evaluating the effect and cost effectiveness of the lightning protection measures.

S403, under the condition that the optimization times are smaller than the optimization times threshold value, determining that the first lightning trip-out rate does not meet the preset condition.

The optimization frequency threshold is a preset optimization standard for judging whether further lightning protection measures are needed to be optimized at present.

In this step, the lightning protection measure determining device may determine that the first lightning trip-out rate does not satisfy the preset condition, under the condition that the optimization number is smaller than the optimization number threshold.

Optionally, if the optimization frequency is not less than the threshold value of the optimization frequency, the lightning trip-out rate can be reduced by adopting a mode of additionally installing a lightning arrester.

Therefore, the lightning protection measure determining device stops the current optimizing process after a certain optimizing frequency is reached by setting the optimizing frequency threshold value, invalid iteration and resource waste are avoided, more reasonable utilization of resources is facilitated, and the lightning protection work efficiency is improved. Further, the information of the optimized times and the first lightning trip-out rate can provide important reference basis for a decision maker.

In one embodiment, fig. 4 is a schematic flow chart of a lightning protection measure determining method of a power transmission line according to another embodiment of the present application, where the related content of "optimizing a line characteristic parameter and determining at least one second lightning trip rate according to the optimized line characteristic parameter" in S203 related to the foregoing embodiment is described as an example. The method of the embodiment of the application can comprise the following steps.

S2031, determining target parameters to be optimized according to initial values of parameters in the line characteristic parameters and corresponding parameter thresholds.

The parameter threshold is a critical value or reference standard set for each line characteristic parameter in order to ensure safe operation of the power system, and may include, but is not limited to, a ground resistance reference threshold, an insulator string length reference threshold, a tower height reference threshold, and a lightning protection angle reference threshold, where the parameter threshold corresponding to each parameter in the line characteristic parameter may be obtained according to an optimal value of each parameter value interval.

Optionally, the initial value of the target parameter is smaller than the corresponding parameter threshold.

In the step, the lightning protection measure determining device can compare the initial value of each parameter in the line characteristic parameters with the corresponding parameter threshold value, and if the initial value of the target parameter is smaller than the corresponding parameter threshold value, the initial value of the target parameter is used as the target parameter to be optimized; if the initial value of the target parameter is not smaller than the corresponding parameter threshold value, updating the initial value of the target parameter to be constant, namely, lowering the lightning trip-out rate function by one latitude, and avoiding the parameter measures in comprehensive measures.

Therefore, the lightning protection measure determining device can quickly identify the target parameters to be optimized by comparing the parameter initial values with the parameter threshold values, update the parameter initial values which reach or exceed the safety standard to constant values, avoid unnecessary adjustment of the parameters, improve the efficiency of the optimization process, and further ensure the safe operation of the power system. By limiting the optimization range and adjusting the parameters with the optimization space, the cost of the optimization process can be reduced.

And S2032, optimizing the initial value of the target parameter to obtain the optimized line characteristic parameter.

Illustratively, the optimized line characteristic parameter is obtained by taking the preset increment as a unit length and advancing the initial value of the target parameter by the length of the preset increment in the preset direction.

Illustratively, the preset increment of the initial value of each of the line characteristic parameters may be 0.1.

In the step, the lightning protection measure determining device can adjust the initial value of the target parameter through a preset increment to obtain the optimized line characteristic parameter, and the optimized solution can be gradually approximated, so that the lightning protection performance of the line is improved.

Therefore, the lightning protection measure determining device can improve the efficiency of the optimization process and reduce the optimization cost while ensuring the precision by adopting an iterative optimization method with preset increment. By optimizing the target parameters, the lightning protection performance of the line can be improved, the lightning trip-out rate is reduced, and the safe and stable operation of the power system is ensured. Further, the setting of the preset increment can be adjusted according to actual conditions, so that the optimization process is more flexible and extensible.

S2033, determining a second lightning trip-out rate of each target parameter according to the optimized line characteristic parameters.

In the step, the lightning protection measure determining device may input the optimized line characteristic parameter into a preset lightning trip-out model according to the optimized line characteristic parameter, so as to obtain a second lightning trip-out rate.

The second lightning trip-out rate can directly reflect the influence of the optimized line characteristic parameters on the lightning protection performance, and the lightning protection measure determining device can clearly analyze the effect of the optimizing measure by comparing the first lightning trip-out rate with the second lightning trip-out rate, so that the effectiveness of the lightning protection measure is evaluated. By continuously optimizing target parameters, the lightning trip-out rate is reduced, and the lightning protection performance of the power system can be remarkably improved.

In the embodiment of the application, the lightning protection measure determining equipment can adjust the parameters with the optimization space by limiting the optimization range, so that the cost of the optimization process can be reduced. The lightning protection measure determining equipment can improve the lightning protection performance of the circuit, reduce the lightning trip-out rate and ensure the safe and stable operation of the power system through optimizing the target parameters. Further, the second lightning trip-out rate can directly reflect the influence of the optimized line characteristic parameters on the lightning protection performance, and the lightning protection measure determining device can clearly analyze the effect of the optimizing measure by comparing the first lightning trip-out rate with the second lightning trip-out rate, so that the effectiveness of the lightning protection measure is evaluated.

In an embodiment, fig. 5 is a schematic flow chart of a lightning protection measure determining method of a power transmission line according to another embodiment of the present application based on the foregoing embodiment, and in the embodiment of the present application, description is given, by way of example, to related content of "determining a target parameter to be optimized according to an initial value of each parameter in line characteristic parameters and a corresponding parameter threshold in S2031 related to the foregoing embodiment". The method of the embodiment of the application can comprise the following steps.

S601, determining a reference interval of each parameter in the line characteristic parameters.

Illustratively, the lightning protection measure determining apparatus may determine the reference value of the ground resistance, the lightning protection angle, and the length of the insulator string according to the overhead transmission line design specification. The reference value may represent a safe, reasonable range of the parameter during design and operation. Further, the lightning protection measure determining device may combine statistical data of the heights of the towers to obtain a distribution of the heights of the towers, thereby determining a reasonable reference range of the heights of the towers.

Optionally, the lightning protection measure determining device may adopt a normal distribution fitting method to determine a reference interval of each parameter in the line characteristic parameters.

In the step, the lightning protection measure determining device can determine the reference interval of each parameter in the line characteristic parameters, and the determined reference interval has the characteristics of standardization and normalization by referring to the preset standard and the statistical data, so that the design and the optimization standard of the lightning protection measure are unified, and the determined reference interval can provide important reference basis for subsequent works such as lightning protection measure optimization, performance evaluation, maintenance management and the like.

S602, carrying out normalization processing on initial values of all parameters in the line characteristic parameters according to reference intervals of all the parameters in the line characteristic parameters to obtain normalized line characteristic parameters.

The normalization process refers to a process of converting an original value of data into a relative value or a proportional value, and enables data of different units or dimensions to be compared and analyzed under the same scale.

Illustratively, the normalized calculation formulas for the lightning protection angle, the insulator string length, and the tower height can all be expressed as:

（9）

wherein, The per-unit value of the parameter is represented,Representing the parameter before taking the per unit value,Representing the optimal value of the value interval of the parameter under the current voltage class condition and under the single-double loop condition; and the worst value of the value interval of the parameter under the current voltage class condition and the single-double loop condition is represented.

For example, for the ground resistance, the normalization is performed after the logarithmic calculation, so that the actual situation is more satisfied, and the normalization calculation formulas of the ground resistance can be expressed as follows:

（10）

wherein, Representing the per-unit value of the ground resistance parameter,Represents the ground resistance parameter before taking the per unit value,The optimal value of the grounding resistance parameter value interval of the parameter under the current voltage class condition and the single-double loop condition is represented; and the worst value of the grounding resistance parameter value interval of the parameter under the current voltage class condition and the single-double loop condition is represented.

In this step, the lightning protection measure determining device may normalize the initial values of the parameters in the line characteristic parameters according to the reference intervals of the parameters in the line characteristic parameters, to obtain normalized line characteristic parameters. Therefore, the lightning protection measure determining device can eliminate unit difference through normalization processing, so that all parameters have the same weight in an optimization or evaluation model, the influence degree of different parameters on the line performance is favorably compared, and deviation caused by different units is avoided.

S603, determining target parameters to be optimized according to the values of the parameters in the normalized line characteristic parameters and the corresponding parameter thresholds.

In the step, the lightning protection measure determining device may compare the value of each parameter in the normalized line characteristic parameter with the corresponding parameter threshold, and if the value of the parameter in the normalized line characteristic parameter is smaller than the corresponding parameter threshold, take the value of the parameter in the normalized line characteristic parameter as the target parameter to be optimized; if the value of the parameter in the normalized line characteristic parameter is not smaller than the corresponding parameter threshold value, updating the value of the parameter in the normalized line characteristic parameter to be constant, namely, lowering the lightning trip-out rate function by one latitude, and avoiding the measure of the parameter in the comprehensive measure.

Therefore, the lightning protection measure determining device can compare the value of each parameter in the normalized line characteristic parameters with the parameter threshold value, and can eliminate the unit difference through normalization processing, so that all the parameters have the same weight in the optimization or evaluation model, the influence degree of different parameters on the line performance can be compared, the target parameters needing to be optimized can be rapidly identified, the parameter initial value which reaches or exceeds the safety standard is updated to be constant, unnecessary adjustment of the parameters can be avoided, the efficiency of the optimization process is improved, and the safe operation of the power system is ensured.

In the embodiment of the application, the lightning protection measure determining equipment can determine the reference interval of each parameter in the line characteristic parameters, and the determined reference interval has the characteristics of standardization and normalization by referring to the preset standard and the statistical data, is beneficial to unifying the design and the optimization standard of the lightning protection measure, and can provide important reference basis for subsequent works such as lightning protection measure optimization, performance evaluation, maintenance management and the like. The lightning protection measure determining device can compare the value of each parameter in the normalized line characteristic parameters with the parameter threshold value, and can eliminate the unit difference through normalization processing, so that the influence degree of different parameters on the line performance can be compared, the target parameters needing to be optimized can be rapidly identified, the initial value of the parameters which reach or exceed the safety standard is updated to be constant, and unnecessary adjustment of the parameters can be avoided, thereby improving the efficiency of the optimization process.

In one embodiment, fig. 6 is a schematic flow chart of a method for determining lightning protection measures of a power transmission line according to another embodiment of the present application based on the foregoing embodiment. The method of the embodiment of the application can comprise the following steps.

S701, acquiring an initial value of the ground inclination angle and an initial value of the ground flash density.

The initial value of the ground inclination angle refers to ground inclination angle information at a specific place, and is usually obtained by a digital elevation model with reference to a horizontal plane.

The initial value of the ground flash density refers to the number of lightning hits per unit area on the ground in a certain time and space range. The ground flash density reference data may refer to lightning activity over a period of time in a particular area, typically in terms of lightning strikes per square kilometer per year.

Hereinafter, the description will be given of exemplary explanation of the related contents of acquiring the initial value of the ground inclination angle.

The ground inclination angle parameter can be obtained by extracting scanning points and central point altitude measurement calculation from the digital elevation model based on the longitude and latitude of the tower.

Illustratively, a two-dimensional plane perpendicular to the line trend is made through the central point of the tower, each of which extends 100m left and right, a scanning point is arranged every 25m, 9 altitudes are extracted in combination with the central point, and the altitude is obtained by a digital elevation model. The included angle between the connecting line of 8 scanning points and the central point and the horizontal direction is the ground inclination angle of the point, the central point is higher than the scanning point and is positive, the central point is lower than the scanning point and is negative, 4 ground inclination angles on the left side and 4 ground inclination angles on the right side are obtained, and the ground inclination angles of 8 ground inclination angles can be averaged to obtain the initial value of the ground inclination angle.

Hereinafter, the description will be given of exemplary explanation of the contents of acquiring the initial value of the ground flash density.

The lightning protection measure determining device can acquire lightning monitoring data from the power grid system, wherein the lightning monitoring data comprises statistic data of ground flash density.

Further, the lightning protection measure determining device may divide the area to be monitored into grids of a preset size according to a grid method, for example, divide the area to be monitored into grid grids of 1km×1 km; for each grid, calculating a number of lightning events within a circle domain of a preset radius, which may be, for example, 3km; according to the selected preset time period, for example, the preset time period can be in units of years and months, and the total number of lightning events in the range of each circle field is counted, namely the initial value of the ground flash density of the area to be monitored.

In the step, the lightning protection measure determining device can acquire the initial value of the ground inclination angle and the initial value of the ground flash density through a preset acquisition method, and basic data is provided for subsequent determination of the lightning defect duty ratio and the lightning risk degree.

Optionally, the lightning protection measure determining device may obtain historical statistics of the ground inclination angle and the ground flash density, and determine a reference interval of an initial value of the ground inclination angle and an initial value of the ground flash density. Further, based on the obtained ground inclination angle initial value and the reference section of the ground flash density initial value, the ground inclination angle initial value and the ground flash density initial value are subjected to normalization processing to obtain a ground inclination angle per unit value and a ground flash density per unit value. The normalization process may refer to the above formula (9), and will not be described here.

S702, determining the lightning defect ratio and/or the lightning risk degree according to the initial value of the ground inclination angle, the initial value of the ground flash density, the initial value of the ground resistance, the initial value of the length of the insulator string, the initial value of the height of the pole tower and the initial value of the protection angle of the lightning conductor.

The lightning defect ratio refers to a quantitative index of the difference between the current parameter state and the good state. For example, when the per unit value of a certain parameter is smaller than 1, the lightning defect ratio is the difference between 1 and the per unit value, which may represent the distance between the current parameter state and the good state, and may represent the extent to which the adverse condition of the parameter affects the lightning risk level. When the per unit value of a certain parameter is greater than or equal to 1, it is considered that a good state has been achieved, and it is not considered as a cause of the high risk of lightning damage.

The lightning risk level refers to an integrated assessment of damage or impact that may be caused by lightning activity.

Illustratively, taking a ground resistance parameter as an example, a lightning defect duty ratio calculation formula of the ground resistance may be expressed as:

（11）

wherein, Representing the per unit value of the ground resistance,A per unit value representing the length of the insulator string,A per unit value representing the height of the tower,A per unit value representing the protection angle of the lightning conductor,A per unit value of the ground inclination angle,Representing the per unit value of the ground flash density parameter.The lightning defect ratio representing the ground resistance.

Of course, the lightning defect duty ratio calculation formula may also be expressed as other variations of the above formula (11) or an equivalent formula.

Note that, the calculation method of the lightning defect ratio of the ground inclination angle, the ground flash density, the insulator string length, the tower height and the lightning protection angle is similar to the calculation method of the above formula (11), and will not be described again here.

For example, the calculation formula of the lightning risk level may be expressed as:

（12）

wherein, A first lightning risk coefficient representing a ground resistance; a first lightning risk factor representing a length of the insulator string; a first lightning risk factor representing a height of the tower; a first lightning risk coefficient representing a lightning protection angle; a first lightning risk coefficient representing the inclination angle of the ground; a first lightning risk coefficient representing a ground flash density parameter; indicating the degree of lightning risk.

Of course, the calculation formula of the lightning risk level may also be expressed as other variations of the above formula (12) or an equivalent formula.

In this step, the lightning protection measure determining device may normalize the ground inclination angle initial value, the ground flash density initial value, the ground resistance initial value, the insulator string length initial value, the tower height initial value, and the lightning protection angle initial value, to obtain a corresponding per unit value, and determine a lightning defect occupation ratio and an overall lightning risk degree corresponding to each parameter according to the per unit value.

Of course, the lightning defect duty ratio and the overall lightning risk degree corresponding to each parameter can also be determined directly according to lightning protection measures, and the equipment can be calculated according to the ground inclination angle initial value, the ground flash density initial value, the ground resistance initial value, the insulator string length initial value, the pole height initial value and the lightning protection angle initial value, which are not limited.

Therefore, the lightning protection measure determining device can evaluate lightning damage risks more comprehensively and accurately by comprehensively considering a plurality of parameters, and provides scientific basis for formulating effective lightning protection measures. Based on detailed parameter analysis, the contribution degree of each parameter to lightning hazard risk can be determined, so that a targeted lightning protection strategy is formulated.

In the embodiment of the application, the lightning protection measure determining equipment can acquire the initial value of the ground inclination angle and the initial value of the ground flash density through a preset acquisition method, and provides basic data for the subsequent determination of the lightning defect duty ratio and the lightning risk degree. Further, by comprehensively considering a plurality of parameters, the lightning hazard risk is estimated more comprehensively and accurately, and a scientific basis is provided for formulating effective lightning protection measures.

In one embodiment, fig. 7 is an overall flow chart of a method for determining lightning protection measures of a power transmission line according to one embodiment of the present application based on the foregoing embodiment. As shown in fig. 7, the method may include the following steps.

S801, the lightning protection measure determining equipment acquires line characteristic parameters of the power transmission line.

The line characteristic parameters comprise an initial value of a grounding resistance, an initial value of an insulator string length, an initial value of a pole tower height and an initial value of a lightning protection angle;

s802, the lightning protection measure determining device determines a first lightning trip-out rate according to the line characteristic parameters.

S803, judging whether the lightning strike risk level of the first lightning strike tripping rate is larger than a risk level threshold, if the lightning strike risk level of the first lightning strike tripping rate is not larger than the risk level threshold, executing S804, otherwise, executing S805.

S804, the lightning protection measures determine all comprehensive measures before the equipment accumulates as the final total comprehensive measure.

S805, the lightning protection measure determining device obtains the optimization times of the lightning protection measure, judges whether the optimization times are smaller than an optimization times threshold, and if the optimization times are not smaller than the optimization times threshold, executes S806; otherwise, S807 is executed.

S806, the lightning protection measure determines that the lightning trip-out rate of the equipment is reduced by adopting a mode of additionally installing a lightning arrester.

S807, judging whether the initial value of each standard parameter in the line characteristic parameters is smaller than a corresponding parameter threshold value; if the initial value of each standard parameter in the line characteristic parameters is not less than the corresponding parameter threshold, executing S808; otherwise, S809 is performed.

The initial value of the target parameter is smaller than the corresponding parameter threshold value.

S808, the lightning protection measure determining apparatus updates the initial value of the target parameter to a constant.

S809, the lightning protection measure determining device takes the initial value of the target parameter as the target parameter to be optimized.

S810, the lightning protection measure determining equipment optimizes the initial value of the target parameter to obtain the optimized line characteristic parameter.

S811, the lightning protection measure determining device determines a second lightning trip-out rate of each target parameter according to the optimized line characteristic parameters.

S812, the lightning protection measure determining device determines lightning trip-out change rates corresponding to the second lightning trip-out rates according to the first lightning trip-out rates and the second lightning trip-out rates.

S813, the lightning protection measure determining device determines lightning protection measure gradient data according to the lightning trip change rate.

S814, the lightning protection measure determining device obtains intermediate values of parameters corresponding to the intermediate lightning protection measure according to the lightning protection measure gradient data, and updates the line characteristic parameters according to the intermediate values of the parameters.

S815, judging whether the updated line characteristic parameters meet the preset conditions, if not, returning to S802, and if yes, executing S816.

S816, the lightning protection measure determining device determines the target lightning protection measure according to the intermediate value of each parameter meeting the preset condition.

It should be noted that, the realizable manner and the technical effect of each step in the embodiment of the present application may refer to the relevant content in the above embodiment, and are not repeated herein.

It should be understood that, although the steps in the flowcharts related to the above embodiments are sequentially shown as indicated by arrows, these steps are not necessarily sequentially performed in the order indicated by the arrows. The steps are not strictly limited to the order of execution unless explicitly recited herein, and the steps may be executed in other orders. Moreover, at least some of the steps in the flowcharts described in the above embodiments may include a plurality of steps or a plurality of stages, which are not necessarily performed at the same time, but may be performed at different times, and the order of the steps or stages is not necessarily performed sequentially, but may be performed alternately or alternately with at least some of the other steps or stages.

Based on the same inventive concept, the embodiment of the application also provides a lightning protection measure determining device of the power transmission line for realizing the lightning protection measure determining method of the power transmission line. The implementation scheme of the device for solving the problem is similar to the implementation scheme recorded in the method, so the specific limitation in the embodiment of the lightning protection measure determining device for one or more power transmission lines provided below can be referred to the limitation of the lightning protection measure determining method for the power transmission lines hereinabove, and will not be repeated here.

In one embodiment, fig. 8 is a schematic structural diagram of a lightning protection measure determining apparatus for a power transmission line according to one embodiment of the present application, where the lightning protection measure determining apparatus for a power transmission line provided by the embodiment of the present application may be applied to lightning protection measure determining devices for a power transmission line, where the lightning protection measure determining devices for a power transmission line may be servers. As shown in fig. 8, the lightning protection measure determining apparatus for a power transmission line according to an embodiment of the present application may include: a first acquisition module 901, a first determination module 902, an optimization module 903, and a second determination module 904, wherein:

A first obtaining module 901, configured to obtain a line characteristic parameter of a power transmission line; the line characteristic parameters comprise an initial value of a grounding resistance, an initial value of the length of an insulator string, an initial value of the height of a pole tower and an initial value of a protection angle of a lightning conductor;

a first determining module 902, configured to determine a first lightning trip rate according to the line characteristic parameter;

The optimizing module 903 is configured to optimize the line characteristic parameter and determine at least one second lightning trip rate according to the optimized line characteristic parameter when the first lightning trip rate does not meet a preset condition;

a second determining module 904, configured to determine a target lightning protection measure according to the first lightning trip-out rate and each second lightning trip-out rate; the target lightning protection measures include target values for each of the line characteristic parameters.

In one embodiment, the second determining module 904 may include: a first determination unit, a second determination unit, and a third determination unit, wherein:

The first determining unit is used for determining lightning protection measure gradient data according to the first lightning trip-out rate and each second lightning trip-out rate;

the second determining unit is used for obtaining intermediate values of parameters corresponding to the intermediate lightning protection measures according to the lightning protection measure gradient data, updating the line characteristic parameters according to the intermediate values of the parameters, and returning to execute the step of determining the first lightning trip-out rate according to the line characteristic parameters until the preset condition is met;

and the third determining unit is used for determining the target lightning protection measures according to the intermediate values of the parameters meeting the preset conditions.

In one embodiment, the first determining unit is specifically configured to:

Determining lightning trip-out change rates corresponding to the second lightning trip-out rates according to the first lightning trip-out rates and the second lightning trip-out rates;

and determining lightning protection measure gradient data according to the trip change rate of each lightning stroke.

In an embodiment, the lightning protection measure determining device for a power transmission line further includes a third determining module, a second obtaining module, and a fourth determining module, where:

The third determining module is used for determining a lightning strike risk level corresponding to the first lightning strike tripping rate;

the second acquisition module is used for acquiring the optimization times of lightning protection measures under the condition that the lightning strike risk level is greater than the risk level threshold value;

And the fourth determining module is used for determining that the first lightning trip-out rate does not meet the preset condition under the condition that the optimization times are smaller than the optimization times threshold value.

In one embodiment, the optimizing module 903 may include: a fourth determination unit, an optimization unit, and a fifth determination unit, wherein:

a fourth determining unit, configured to determine a target parameter to be optimized according to an initial value of each parameter in the line characteristic parameters and a corresponding parameter threshold; the initial value of the target parameter is smaller than the corresponding parameter threshold value;

the optimizing unit is used for optimizing the initial value of the target parameter to obtain the optimized line characteristic parameter;

And a fifth determining unit, configured to determine a second lightning trip-out rate of each target parameter according to the optimized line characteristic parameter.

In one embodiment, the fourth determining unit is specifically configured to:

Determining a reference interval of each parameter in the line characteristic parameters;

Normalizing the initial values of the parameters in the line characteristic parameters according to the reference interval of the parameters in the line characteristic parameters to obtain normalized line characteristic parameters;

and determining the target parameter to be optimized according to the value of each parameter in the normalized line characteristic parameters and the corresponding parameter threshold value.

In an embodiment, the lightning protection measure determining device for a power transmission line further includes a third obtaining module and a fifth determining module, where:

The third acquisition module is used for acquiring the initial value of the ground inclination angle and the initial value of the ground flash density;

and the fifth determining module is used for determining the lightning defect occupation ratio and/or the lightning risk degree according to the ground inclination angle initial value, the ground flash density initial value, the ground resistance initial value, the insulator string length initial value, the pole tower height initial value and the lightning protection angle initial value.

The lightning protection measure determining device for the power transmission line provided by the embodiment can execute the method embodiment, and the implementation principle and the technical effect are similar, and are not repeated here.

All or part of each module in the lightning protection measure determining device of the power transmission line can be realized by software, hardware and a combination thereof. The modules can be embedded in a processor in the lightning protection measure determining equipment of the power transmission line in a hardware mode or can be stored in a memory in the lightning protection measure determining equipment of the power transmission line in a software mode so that the processor can call and execute operations corresponding to the modules.

In an exemplary embodiment, a lightning protection measure determining apparatus of a power transmission line is provided, which may be a server, and an internal structure diagram thereof may be as shown in fig. 9. The lightning protection measure determining device comprises a processor, a memory, an Input/Output interface (I/O) and a communication interface. The processor, the memory and the input/output interface are connected through a system bus, and the communication interface is connected to the system bus through the input/output interface. Wherein the processor of the lightning protection measure determining device of the transmission line is used for providing computing and control capabilities. The memory of the lightning protection measure determining device of the power transmission line comprises a nonvolatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The internal memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the lightning protection measure determining equipment of the power transmission line is used for storing line characteristic parameters, a first lightning trip-out rate, a second lightning trip-out rate and the like which need to be processed. The lightning protection measure of the transmission line determines that the input/output interface of the equipment is used for exchanging information between the processor and the external equipment. The lightning protection measure determines that the communication interface of the device is used for communicating with an external terminal through a network connection. The computer program, when executed by the processor, implements the method for determining lightning protection measures of a power transmission line provided in the above-described embodiment of the present application.

It will be appreciated by those skilled in the art that the structure shown in fig. 9 is merely a block diagram of a part of the structure related to the present application and does not constitute a limitation of the lightning protection means determining device of the power transmission line to which the present application is applied, and that a specific lightning protection means determining device of the power transmission line may include more or less components than those shown in the drawings, or may combine some components, or may have a different arrangement of components.

In one embodiment, a lightning protection measure determining device is provided, including a memory and a processor, where the memory stores a computer program, and the processor implements the technical scheme in the embodiment of the lightning protection measure determining method for the power transmission line according to the present application when executing the computer program, and the implementation principle and the technical effect are similar, and are not repeated herein.

In one embodiment, a computer readable storage medium is provided, on which a computer program is stored, where the computer program when executed by a processor implements the technical solution in the embodiment of the lightning protection measure determining method for a power transmission line according to the present application, and the implementation principle and the technical effect are similar, and are not repeated herein.

In one embodiment, a computer program product is provided, and the computer program product is implemented by a processor to implement the technical scheme in the embodiment of the lightning protection measure determining method for the power transmission line according to the present application, and the implementation principle and the technical effect are similar, and are not repeated herein.

Those skilled in the art will appreciate that implementing all or part of the above-described methods may be accomplished by way of a computer program, which may be stored on a non-transitory computer readable storage medium and which, when executed, may comprise the steps of the above-described embodiments of the methods. Any reference to memory, database, or other medium used in embodiments provided herein may include at least one of non-volatile and volatile memory. The nonvolatile Memory may include Read-Only Memory (ROM), magnetic tape, floppy disk, flash Memory, optical Memory, high density embedded nonvolatile Memory, resistive random access Memory (ReRAM), magneto-resistive random access Memory (Magnetoresistive Random Access Memory, MRAM), ferroelectric Memory (Ferroelectric Random Access Memory, FRAM), phase change Memory (PHASE CHANGE Memory, PCM), graphene Memory, and the like. Volatile memory can include random access memory (Random Access Memory, RAM) or external cache memory, and the like. By way of illustration, and not limitation, RAM can be in various forms such as static random access memory (Static Random Access Memory, SRAM) or dynamic random access memory (Dynamic Random Access Memory, DRAM), etc. The processor referred to in the embodiments provided in the present application may be a general-purpose processor, a central processing unit, a graphics processor, a digital signal processor, a programmable logic unit, a data processing logic unit based on quantum computing, or the like, but is not limited thereto.

The technical features of the above embodiments may be arbitrarily combined, and all possible combinations of the technical features in the above embodiments are not described for brevity of description, however, as long as there is no contradiction between the combinations of the technical features, they should be considered as the scope of the description.

The foregoing examples illustrate only a few embodiments of the application, which are described in detail and are not to be construed as limiting the scope of the application. It should be noted that it will be apparent to those skilled in the art that several variations and modifications can be made without departing from the spirit of the application, which are all within the scope of the application. Accordingly, the scope of the application should be assessed as that of the appended claims.

Claims (10)

1. A method for determining lightning protection measures for a power transmission line, characterized in that the method comprises: Acquire line characteristic parameters of the transmission line; the line characteristic parameters include an initial value of ground resistance, an initial value of insulator string length, an initial value of tower height, and an initial value of lightning conductor protection angle; Determining a first lightning trip rate according to the line characteristic parameters; When the first lightning trip rate does not meet the preset conditions, optimizing the line characteristic parameters, and determining at least one second lightning trip rate according to the optimized line characteristic parameters; Determine lightning protection measure gradient data according to the first lightning trip rate and each of the second lightning trip rates, wherein the lightning protection measure gradient data is determined according to the change rate of the lightning trip rate before and after different lightning protection measures, and is used to characterize the influence of each line characteristic parameter on reducing the trip rate; According to the gradient data of the lightning protection measures, the intermediate values of the parameters corresponding to the intermediate lightning protection measures are obtained, and the line characteristic parameters are updated according to the intermediate values of the parameters, and the step of determining the first lightning tripping rate according to the line characteristic parameters is returned to be executed until the preset conditions are met; and the target lightning protection measures are determined according to the intermediate values of the parameters that meet the preset conditions. 2. The method according to claim 1, characterized in that the step of determining the lightning protection measure gradient data according to the first lightning trip rate and each of the second lightning trip rates comprises: Determining a lightning tripping change rate corresponding to each of the second lightning tripping rates according to the first lightning tripping rate and each of the second lightning tripping rates; According to each of the lightning tripping change rates, the lightning protection measure gradient data is determined. 3. The method according to claim 1, characterized in that the method further comprises: Determining a lightning strike risk level corresponding to the first lightning strike trip rate; When the lightning strike risk level is greater than the risk level threshold, obtaining the number of optimization times of the lightning protection measures; When the number of optimizations is less than a threshold number of optimizations, it is determined that the first lightning trip rate does not meet a preset condition. 4. The method according to any one of claims 1 to 3, characterized in that said optimizing the line characteristic parameters and determining at least one second lightning trip rate according to the optimized line characteristic parameters comprises: Determining a target parameter to be optimized according to an initial value of each parameter in the line characteristic parameter and a corresponding parameter threshold; the initial value of the target parameter is less than the corresponding parameter threshold; Optimizing the initial value of the target parameter to obtain optimized line characteristic parameters; A second lightning trip rate for each target parameter is determined according to the optimized line characteristic parameter. 5. The method according to claim 4, characterized in that the step of determining the target parameter to be optimized according to the initial value of each parameter in the line characteristic parameters and the corresponding parameter threshold comprises: Determining a reference interval for each parameter of the line characteristic parameters; According to the reference interval of each parameter in the line characteristic parameter, the initial value of each parameter in the line characteristic parameter is normalized to obtain the normalized line characteristic parameter; The target parameter to be optimized is determined according to the value of each parameter in the normalized line characteristic parameters and the corresponding parameter threshold. 6. The method according to any one of claims 1 to 3, characterized in that the method further comprises: Obtain the initial value of ground inclination and ground-to-ground lightning density; The proportion of lightning damage defects and/or the degree of lightning damage risk are determined according to the initial value of the ground inclination angle, the initial value of the ground lightning density, the initial value of the ground resistance, the initial value of the insulator string length, the initial value of the tower height and the initial value of the lightning conductor protection angle. 7. A device for determining lightning protection measures for a power transmission line, characterized in that the device comprises: An acquisition module is used to acquire line characteristic parameters of a transmission line; the line characteristic parameters include an initial value of ground resistance, an initial value of insulator string length, an initial value of tower height, and an initial value of lightning protection angle; A first determination module, used to determine a first lightning trip rate according to the line characteristic parameters; An optimization module, configured to optimize each of the line characteristic parameters when the first lightning trip rate does not meet a preset condition, and determine at least one second lightning trip rate according to the optimized line characteristic parameters; A first determining unit is used to determine lightning protection measure gradient data according to the first lightning trip rate and each of the second lightning trip rates, wherein the lightning protection measure gradient data is determined according to the change rate of the lightning trip rate before and after different lightning protection measures, and is used to characterize the influence of each line characteristic parameter on reducing the trip rate; A second determination unit is used to obtain the intermediate values of the parameters corresponding to the intermediate lightning protection measures according to the lightning protection measures gradient data, and update the line characteristic parameters according to the intermediate values of the parameters, and return to the step of determining the first lightning tripping rate according to the line characteristic parameters until the preset condition is met; The third determination unit is used to determine the target lightning protection measures according to the intermediate values of the parameters that meet the preset conditions. 8. A device for determining lightning protection measures for a transmission line, 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 the method described in any one of claims 1 to 6 when executing the computer program. 9. A computer-readable storage medium having a computer program stored thereon, wherein when the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented. 10. A computer program product, comprising a computer program, characterized in that when the computer program is executed by a processor, the steps of the method according to any one of claims 1 to 6 are implemented.