Intelligent lightning interceptor and lightning surge pulse protection method

Abstract

The invention relates to the technical field of intelligent sensing thunder and lightning interceptors, in particular to an intelligent thunder and lightning interceptor and a lightning surge pulse protection method, and the method comprises the steps: measuring a thunder and lightning current sequence when thunder and lightning occur through a thunder and lightning current recorder, dividing the thunder and lightning current sequence to obtain thunder and lightning current subsequences, and calculating the thunder and lightning change rate of each thunder and lightning current; determining the lightning magnetic field deviation degree of each lightning current based on the difference between the lightning change rates of each lightning current and the adjacent lightning current and the average value of the lightning change rates of all lightning currents in the lightning current sub-sequence, and obtaining the lightning magnetic field interference intensity of each lightning current by combining the difference between each lightning current and the average value of the left and right adjacent lightning currents. Calculating a lightning magnetic field correction coefficient of each lightning current, and correcting each lightning current in the lightning current sub-sequence; and intercepting thunder and lightning by adopting a thunder and lightning interceptor according to the corrected amplitude spectrum and energy spectrum of the thunder and lightning wave. The lightning current data precision can be improved, and the lightning interception accuracy is ensured.

Description

Technical Field

[0001] The present application relates to the technical field of intelligent sensor lightning interceptors, and in particular to an intelligent lightning interceptor and a lightning surge pulse protection method. Background Art

[0002] At present, the mainstream design of wind turbine lightning protection is that the lightning lightning receptor system of the wind turbine is located on the surface area of ​​the wind turbine blades, and the blade lightning conductor is bonded inside the blade cavity. After the blade is struck by lightning, the lightning receptor and lightning conductor may locally heat up and cause the blade to burn or be damaged. According to the interception principle of the lightning interceptor: when the electric field of the thundercloud approaches, the ground is induced with a charge of the opposite polarity to the charge at the bottom of the thundercloud. The polarity converter of the resonant cavity converts the polarity of the earth charge and sends it to the cavity amplitude spectrum selective impedance converter. The cavity resonates and transmits the charge to the end of the cavity, so that the end of the cavity gathers several times the opposite polarity of the charge at the bottom of the thundercloud. When the air breakdown threshold is reached, corona begins and an upward leader is generated.

[0003] When lightning occurs, it will generate a lightning electromagnetic field. The lightning electromagnetic field will generate magnetic field noise on the lightning current data, causing the lightning current data to be distorted. Traditionally, time series data is mostly denoised by mean filtering, but due to the different lightning intensities, the lightning electromagnetic field intensities caused are also different, resulting in poor lightning current correction effects, and thus poor lightning interceptor effects. Summary of the invention

[0004] In order to solve the above technical problems, the purpose of this application is to provide an intelligent lightning interceptor and a lightning surge pulse protection method. The technical solutions adopted are as follows:

[0005] The present invention provides a method for protecting against lightning surge pulses, including the following steps:

[0006] The lightning current data at each acquisition time when lightning occurs is measured by a lightning current recorder to form a lightning current sequence;

[0007] Based on the extreme points of the trend sequence corresponding to the lightning current sequence, the lightning current sequence is divided into lightning current subsequences, and the lightning change rate of each lightning current is analyzed according to the difference between each lightning current in the lightning current subsequence and its adjacent lightning current;

[0008] Based on the difference in lightning change rate between each lightning current in the lightning current subsequence and its adjacent lightning current, and the average value of the lightning change rate of all lightning currents in the lightning current subsequence, the lightning electromagnetic field deviation of each lightning current is determined, and combined with the difference between each lightning current in the lightning current subsequence and the average value of its left and right adjacent lightning currents, the lightning electromagnetic field interference intensity of each lightning current is obtained;

[0009] Calculate the lightning electromagnetic field correction coefficient of each lightning current according to the lightning electromagnetic field interference intensity, and correct each lightning current in the lightning current subsequence according to the difference between each lightning current in the lightning current subsequence and the mean value of its left and right adjacent lightning currents in combination with the lightning electromagnetic field correction coefficient;

[0010] According to the amplitude spectrum and energy spectrum of the corrected lightning wave, a lightning interceptor is used to intercept lightning.

[0011] Furthermore, each lightning current subsequence further comprises:

[0012] The time series decomposition algorithm is used to obtain the trend sequence of the lightning current sequence, the extreme points of the trend sequence are detected, and the lightning current sequence is divided according to all the extreme points to obtain each lightning current subsequence.

[0013] Furthermore, the lightning change rate of each lightning current is further the absolute value of the difference between each lightning current in the lightning current subsequence and its adjacent previous lightning current.

[0014] Furthermore, the expression of the lightning electromagnetic field deviation is: In the formula, Ac i Av is the lightning electromagnetic field deviation of the i-th lightning current in the lightning current subsequence; i 、Av i-1 、Av i+1 are the lightning change rates of the i-th, i-1-th, and i+1-th lightning currents in the lightning current subsequence respectively; is the average value of the lightning change rates of all lightning currents in the lightning current subsequence; k is a preset value greater than zero.

[0015] Furthermore, the lightning electromagnetic field interference intensity of each lightning current is the product of the lightning electromagnetic field deviation and the lightning impact confidence of each lightning current.

[0016] Furthermore, the lightning impact confidence is the absolute value of the difference between each lightning current and the average of its left and right adjacent lightning currents.

[0017] Furthermore, the lightning impact confidences of the first and last lightning currents in the lightning current subsequence are both assigned a value of 0.

[0018] Furthermore, the lightning electromagnetic field correction coefficient of each lightning current is expressed as: G i =1-exp(Tq i );where G i , Tq i It represents the lightning electromagnetic field correction coefficient and lightning electromagnetic field interference intensity of the i-th lightning current in the lightning current subsequence; exp() represents an exponential function with a natural constant as the base.

[0019] Furthermore, the correction value expression of each lightning current in the lightning current subsequence is: ′ i =A i +G i ×(MA i -A i );where A ′ i A represents the lightning current correction value of the i-th lightning current in the lightning current subsequence; i , G i Indicates the lightning electromagnetic field correction coefficient of the ith lightning current and the ith lightning current in the lightning current subsequence; MA i It represents the mean value of the left and right adjacent lightning currents of the i-th lightning current in the lightning current subsequence.

[0020] An embodiment of the present application also provides an intelligent lightning interceptor, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, wherein the processor implements the steps of any one of the above methods when executing the computer program.

[0021] It can be seen from the above that the intelligent lightning interceptor and lightning surge pulse protection method provided by the present application have at least the following beneficial effects:

[0022] This application takes into account that when filtering lightning current data, the magnetic field strength of lightning is different due to the different intensities of lightning, which makes the traditional processing of lightning current data less effective. This application collects data through a lightning current recorder, uses STL decomposition and extreme point detection algorithms to analyze lightning current trends, calculates lightning change rate and magnetic field deviation, and evaluates magnetic field interference intensity to construct a correction coefficient and correct the lightning current data, so that the corrected data is closer to the real lightning current data, and the correction effect is better, so that the lightning interceptor has a better interception effect on lightning. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions and advantages in the embodiments of the present application or the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 A flowchart of a lightning surge pulse protection method provided in this application;

[0025] Figure 2 A schematic diagram of the discharge process of an ideal multi-pulse lightning current provided in this application;

[0026] Figure 3 Provide the original data corresponding to the lightning current sequence and the waveform diagram of the trend sequence of the lightning current sequence for this application;

[0027] Figure 4 Schematic diagram of trend sequence extreme point detection provided for this application;

[0028] Figure 5 A schematic diagram of the lightning current amplitude correction sequence and its amplitude spectrum and energy spectrum provided in this application. DETAILED DESCRIPTION

[0029] In order to further explain the technical means and effects adopted by the present application to achieve the predetermined invention purpose, the following, in combination with the accompanying drawings and preferred embodiments, describes in detail the specific implementation, structure, features and effects of an intelligent lightning interceptor and a lightning surge pulse protection method proposed in the present application. In the following description, different "one embodiment" or "another embodiment" does not necessarily refer to the same embodiment. In addition, specific features, structures or characteristics in one or more embodiments may be combined in any suitable form.

[0030] Unless otherwise specified and limited, terms such as "comprises", "comprising" or any other variants thereof are intended to cover non-exclusive inclusion, so that a circuit structure, article or device including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such articles or devices. In the absence of further restrictions, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the article or device including the element. In addition, the term "and\or" used herein includes any and all combinations of one or more related listed items. All technical and scientific terms used herein have the same meaning as those commonly understood by technicians in the technical field of this application.

[0031] The specific scheme of an intelligent lightning interceptor and a lightning surge pulse protection method provided by the present application is described in detail below with reference to the accompanying drawings.

[0032] See also Figure 1 , which shows a flowchart of a lightning surge pulse protection method provided by an embodiment of the present application, including the following steps:

[0033] Step 1: Use a lightning current recorder to measure the lightning current data at each collection moment when lightning occurs to form a lightning current sequence.

[0034] Lightning current sensors are installed on wind turbines to collect the amplitude of lightning current when lightning occurs. The multi-pulse discharge of lightning mainly includes the first return pulse, the subsequent return pulse, the final return pulse and other processes. The schematic diagram of the discharge process of the ideal state of multi-pulse lightning current is shown in the figure. Figure 2 As shown, Figure 2 There is an M component in the continuous current. Figure 2 As shown in Figure 2 The horizontal axis is time t, representing the time when the lightning strike occurs, and the vertical axis is the lightning current i.

[0035] In this embodiment, during the data collection and analysis of lightning current, the sampling interval of the lightning current sensor is 10iHz, and the sampling time is 1s, which can be set by the implementer. Since the indirect object collected by the lightning current sensor is lightning, strong magnetic induction will be caused when lightning occurs, making it possible that the data collected by the lightning current sensor is missing. Therefore, in this embodiment, the mean filling method is used to complete the missing lightning current data. The completed lightning current data is arranged in the order of collection time to obtain a lightning current sequence.

[0036] Step 2: Divide the lightning current sequence into lightning current subsequences based on the extreme points of the trend sequence corresponding to the lightning current sequence, and analyze the lightning change rate of each lightning current according to the difference between each lightning current in the lightning current subsequence and its adjacent lightning current.

[0037] Under normal conditions without lightning, the value displayed by the lightning current sensor is usually very small, almost negligible, and close to zero. However, once lightning strikes the sky, the reading of the lightning current sensor will soar rapidly, which is called a lightning surge, reflecting the sharp increase in current. When the lightning current reaches its peak, that is, the strongest moment, it will begin to gradually decline, forming a clear current pulse. Subsequently, the current will experience a series of fluctuations and repeated pulses until the lightning strike is complete.

[0038] There are three significant physical characteristics of multiple lightning pulses: first, there are many pulses, and the envelope of their waveform is hump-shaped; second, the time interval between pulses has two values ​​(50ms and 400ms); third, the impact time can be as long as 1s.

[0039] When a lightning strike occurs, it is accompanied by not only a lightning surge, but also a strong lightning electromagnetic field. The strength of this magnetic field may have an impact on the surrounding electromagnetic environment. As a precision device for capturing current changes, the lightning current sensor's data may be interfered by the lightning electromagnetic field. Changes in the magnetic field may induce additional current in the sensor's circuit, thereby affecting the accuracy of the sensor's readings.

[0040] Ideally, when the lightning current sensor reaches the peak value of a lightning surge pulse, the lightning current data is a single-increase property, and the data growth state is relatively similar; after the peak value of the lightning surge pulse, the lightning current data has a single-decrease property, and the data reduction state is relatively similar. Although the lightning electromagnetic field will affect the lightning current data, the change trend of the lightning current will not change during the pulse process.

[0041] Based on this, the lightning current sequence is used as the input of the STL (Seasonal and Trend decomposition using Loess) decomposition algorithm, and the output is the trend sequence. Specifically, the waveform diagram of the original data of the lightning current sequence corresponding to the collected lightning current amplitude data and the waveform diagram of the trend sequence obtained by the STL decomposition of the lightning current sequence are as follows: Figure 3 As shown, Figure 3 In the example, the original data is the lightning current amplitude at each acquisition moment obtained in step 1. Figure 3 The horizontal axis of the raw data waveform diagram is time, and the vertical axis is the lightning current amplitude, that is, the collected raw lightning current data. Figure 3 The horizontal axis of the fluctuation diagram of the trend sequence is time, and the vertical axis is the trend strength. Further, the trend sequence is used as the input of the extreme point detection algorithm, and the output is the position of the extreme point in the trend sequence. Specifically, the extreme point detection diagram of this embodiment is as follows Figure 4 As shown, Figure 4 The middle curve represents the waveform diagram of the trend sequence, and the circles represent the extreme points in the waveform diagram corresponding to the trend sequence. Figure 4 The horizontal axis represents time, and the vertical axis represents the trend amplitude. Finally, the lightning current sequence is segmented by the positions of all extreme points, and each segmented subsequence is recorded as a lightning current subsequence. The STL decomposition algorithm and the extreme point detection algorithm are both well-known technologies, and the specific calculation process will not be repeated here.

[0042] In this embodiment, any lightning current subsequence is taken as an example for analysis. For the lightning current subsequence, it is the state of the lightning current from trough to peak value, or from peak value to trough under one pulse. Since the lightning current is a single trend data under an ideal state, the change amplitude of the lightning current data at adjacent acquisition moments in the lightning current subsequence is similar or the same. When the change amplitude differs greatly, it indicates that the lightning current data is highly affected by the lightning electromagnetic field.

[0043] Thus, the lightning change rate at each acquisition time in the lightning current subsequence is calculated, and the difference between the lightning current at each acquisition time in the lightning current subsequence and its adjacent acquisition time is used as the lightning change rate of each lightning current in the lightning current subsequence. In this embodiment, the lightning current difference is analyzed by taking the absolute value of the difference. Specifically, the corresponding calculation formula is: Av i=|A i -A i-1 |, where Av i A represents the lightning change rate of the i-th lightning current in the lightning current subsequence; i , A i-1 They represent the lightning currents of the i-th and i-1-th lightning currents in the lightning current subsequence respectively; || indicates the absolute value sign.

[0044] It should be noted that the lightning change rate at the first acquisition moment of the lightning current subsequence is the average of the lightning change rates at all other acquisition moments except the first acquisition moment.

[0045] When the intensity of lightning increases significantly at a certain moment, the growth rate of lightning current value increases faster in unit time, which is manifested as a significant increase in the gap between lightning currents at two adjacent acquisition moments. Therefore, the greater the lightning change rate at each acquisition moment in the lightning current subsequence.

[0046] Step 3: Based on the difference in lightning change rate between each lightning current in the lightning current subsequence and its adjacent lightning current, and the average value of the lightning change rate of all lightning currents in the lightning current subsequence, determine the lightning electromagnetic field deviation of each lightning current, and combine the difference between each lightning current in the lightning current subsequence and the average value of its left and right adjacent lightning currents to obtain the lightning electromagnetic field interference intensity of each lightning current.

[0047] Furthermore, for the lightning current data in the lightning current subsequence, the greater the degree of influence by the lightning electromagnetic field, the greater the difference between the lightning change rate of each lightning current and the adjacent lightning current.

[0048] Thus, the lightning electromagnetic field deviation of each lightning current in the lightning current subsequence is calculated. The calculation formula in this embodiment is:

[0049] In the formula, Ac i Av represents the lightning electromagnetic field deviation of the i-th lightning current in the lightning current subsequence; i 、Av i-1 、Av i+1 They represent the lightning change rates of the i-th, i-1-th, and i+1-th lightning currents in the lightning current subsequence respectively; represents the average value of the lightning change rate of all lightning currents in the lightning current subsequence; k is a preset value greater than zero, and in this embodiment, the value is 1. It should be noted that for the lightning current subsequence, when i=1 and i=n, ​​the corresponding Av i-1 =Av0 and Av i+1 =Av n+1 Lightning current does not exist. In order to ensure the normal calculation of data, Av0 is assigned to Av2 during the calculation process. n+1 Assign value to Avn-1 , n represents the length of the lightning current subsequence.

[0050] When the lightning current in the lightning current subsequence is an abnormal lightning current, that is, a lightning current affected by a lightning electromagnetic field, its lightning current data is displayed as an increase or decrease in the rate of change in the lightning current sensor, but the actual situation is that the rate of change has not increased or decreased dramatically. Compared with the lightning current data not affected by the lightning electromagnetic field, the difference in the lightning change rate of adjacent lightning currents in the lightning current subsequence affected by the lightning electromagnetic field is larger; due to the influence of the lightning electromagnetic field, the change in the overall lightning current data is not obvious, so the mean value of the lightning change rate of all lightning currents in the lightning current subsequence does not change much. As a result, the lightning electromagnetic field deviation Ac of the lightning current affected by the lightning electromagnetic field in the lightning current subsequence j The value of increases, and the greater the degree of influence, the larger the value.

[0051] Since the trend of lightning current in a single lightning current subsequence is the same, there will be no jump point in the lightning current data when lightning occurs. Therefore, in normal lightning current data, there is similarity between the lightning current data and its neighboring lightning current data, that is, the difference between the mean values ​​of the adjacent data is small.

[0052] Therefore, the lightning impact confidence of each lightning current can be obtained through the lightning proximity data. The lightning impact confidence of each lightning current in the lightning current subsequence is the difference between each lightning current and the mean value of its left and right adjacent lightning currents. The specific calculation formula in this embodiment is: At i =|A i -MA i |; In the formula, At i A represents the lightning impact confidence of the i-th lightning current in the lightning current subsequence; i Represents the i-th lightning current in the lightning current subsequence; MA i It represents the mean value of the left and right adjacent lightning currents of the i-th lightning current in the lightning current subsequence, that is, the mean value of the left and right adjacent lightning currents.

[0053] It should be noted that, in this embodiment, the lightning impact confidence levels of the first lightning current and the last lightning current in the lightning current subsequence are set to 0.

[0054] Due to the trend characteristics of lightning current data, there will be no jump points in the lightning current data. Therefore, when the lightning current data is more affected by the lightning electromagnetic field, the greater the difference between the lightning current data collected by the lightning current sensor and the average value of its adjacent lightning current, the lightning impact confidence At i The larger it is, the more the lightning current data is affected by the magnetic field.

[0055] Therefore, the lightning electromagnetic field deviation of each lightning current is combined with the lightning impact confidence to calculate the lightning electromagnetic field interference intensity of each lightning current in the lightning current subsequence. The calculation formula in this embodiment is specifically as follows:

[0056] Tq i =Ac i ×At i ; In the formula, Tq i Ac represents the electromagnetic interference intensity of the i-th lightning current in the lightning current subsequence; i At represents the lightning electromagnetic field deviation of the i-th lightning current in the lightning current subsequence; i It represents the lightning impact confidence of the i-th lightning current in the lightning current subsequence.

[0057] The greater the influence of the magnetic field on the lightning current, the higher the distortion of the data collected by the lightning current sensor, and the lightning electromagnetic field deviation Ac of the lightning current data. i The larger the value is, the higher the confidence level of the lightning current data deviation is, that is, the lightning impact confidence level At i The larger the value is, the greater the lightning electromagnetic field interference intensity Tq of the lightning current in the lightning current subsequence i The larger it is, the more the lightning current data collected by the lightning circuit sensor should be corrected to reduce the distortion properties of the data.

[0058] Step 4: Calculate the lightning electromagnetic field correction coefficient of each lightning current according to the lightning electromagnetic field interference intensity, and correct each lightning current in the lightning current subsequence according to the difference between each lightning current in the lightning current subsequence and the mean value of its left and right adjacent lightning currents in combination with the lightning electromagnetic field correction coefficient.

[0059] Further, the lightning electromagnetic field correction coefficient of each lightning current is calculated according to the lightning electromagnetic field interference intensity. The calculation formula of the lightning electromagnetic field correction coefficient in this embodiment is: G i =1-exp(Tq i );where G i It represents the lightning electromagnetic field correction coefficient of the i-th lightning current in the lightning current subsequence; exp() represents an exponential function with a natural constant as the base.

[0060] The greater the lightning electromagnetic field interference intensity of the lightning current in the lightning current subsequence, the deeper the lightning current data collected by the lightning current sensor is affected by the lightning electromagnetic field. When correcting the lightning current data, the correction intensity of the lightning current should be greater, thus making the value of the lightning electromagnetic field correction coefficient of the lightning current larger.

[0061] Furthermore, the lightning current in the lightning current subsequence is corrected by the lightning electromagnetic field correction coefficient to obtain the lightning current correction value of each lightning current. The corresponding calculation formula is:

[0062] A′ i =A i +G i ×(MA i -A i );where A ′ i A represents the lightning current correction value of the i-th lightning current in the lightning current subsequence; i represents the i-th lightning current in the lightning current subsequence; G i Represents the lightning electromagnetic field correction coefficient of the i-th lightning current in the lightning current subsequence; MA i It represents the mean value of the left and right adjacent lightning currents of the i-th lightning current in the lightning current subsequence.

[0063] The greater the influence of the lightning electromagnetic field on the lightning current data, the greater the deviation between the lightning current data collected by the lightning current sensor and the actual lightning current data. Therefore, when correcting the lightning current data, the lightning electromagnetic field correction coefficient G of the lightning current in the lightning current subsequence is i The larger the value of (MA i -A i ) is larger, thus making the lightning current correction value A of the lightning current in the lightning current subsequence ′ i The higher the correction strength, the higher the correction strength. It should be noted that due to (MA i -A i ) may be negative, therefore, in this embodiment, the above (MA i -A i ) means that the larger the value is, the more significant it is, regardless of the sign, and not the positive or negative factors.

[0064] Step 5: According to the corrected amplitude spectrum and energy spectrum of the lightning wave, a lightning interceptor is used to intercept the lightning.

[0065] Through the above steps, the lightning current in each lightning current subsequence is corrected. For the convenience of understanding and expression, in this embodiment, the lightning current correction values ​​are arranged according to the arrangement positions of the lightning currents before correction to obtain a lightning current amplitude correction sequence.

[0066] Furthermore, the lightning current amplitude correction sequence is transmitted to the lightning interceptor, and the lightning interceptor can obtain the corresponding amplitude spectrum and energy spectrum based on the double exponential wave characteristics of the lightning current by using Fourier transform and Basseva equation. Figure 5 As shown, Figure 5 In the waveform diagram corresponding to the lightning current amplitude correction sequence, the horizontal axis represents time, and the vertical axis represents the lightning current correction value. In the amplitude and energy spectrum diagram, the horizontal axis is frequency, and the vertical axis is amplitude and energy, respectively.

[0067] According to the amplitude and energy spectrum distribution law of lightning waves, the charge polarity conversion technology, wave impedance voltage multiplication technology, and distributed parameter control technology in the lightning interceptor are adopted. The lightning interceptor outputs lightning current spectrum data with spectrum characteristics, that is, the lightning interceptor selects the lightning current spectrum data. Finally, the cavity resonance of the lightning interceptor generates a corresponding charge according to the output lightning current spectrum data, and transmits the charge to the end of the cavity, so that the end of the cavity gathers several times the opposite polarity of the charge at the bottom of the thundercloud. When the air breakdown threshold is reached, corona begins and an upward leader is generated, thereby intercepting lightning. It should be noted that the specific process of lightning interception is a prior art. Among them, the double wave index of lightning current, Fourier transform, Basseva equation, charge polarity conversion technology, wave impedance voltage multiplication technology, and distributed parameter control technology are all well-known technologies in the field, and the specific calculation process will not be repeated.

[0068] So far, the lightning surge pulse protection method can be implemented according to the above process of this embodiment.

[0069] Based on the same inventive concept as the above method, an embodiment of the present application also provides an intelligent lightning interceptor, including a memory, a processor, and a computer program stored in the memory and running on the processor. When the processor executes the computer program, the steps of any one of the above-mentioned lightning surge pulse protection methods are implemented.

[0070] It is to be understood that the sequence of the embodiments of the present application described above is for description only and does not represent the advantages and disadvantages of the embodiments. The above describes specific embodiments of the present specification. In addition, the processes depicted in the accompanying drawings do not necessarily require the specific order or continuous order shown to achieve the desired results. In some embodiments, multitasking and parallel processing are also possible or may be advantageous.

[0071] The various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referenced to each other, and each embodiment focuses on the differences from other embodiments.

[0072] The above content is only an implementation method of the present application and is not intended to limit the scope of the present application. Any equivalent structure or equivalent process transformation made using the contents of the present application specification and drawings, or directly or indirectly used in other related technical fields, are also included in the protection scope of the present application.

Claims

1. A lightning surge pulse protection method, characterized in that: The following steps are involved: The lightning current data at each acquisition time when lightning occurs is measured by a lightning current recorder to form a lightning current sequence; Based on the extreme points of the trend sequence corresponding to the lightning current sequence, the lightning current sequence is divided into lightning current subsequences, and the lightning change rate of each lightning current is analyzed according to the difference between each lightning current in the lightning current subsequence and its adjacent lightning current; Based on the difference in lightning change rate between each lightning current in the lightning current subsequence and its adjacent lightning current, and the average value of the lightning change rate of all lightning currents in the lightning current subsequence, the lightning electromagnetic field deviation of each lightning current is determined, and combined with the difference between each lightning current in the lightning current subsequence and the average value of its left and right adjacent lightning currents, the lightning electromagnetic field interference intensity of each lightning current is obtained; Calculate the lightning electromagnetic field correction coefficient of each lightning current according to the lightning electromagnetic field interference intensity, and correct each lightning current in the lightning current subsequence according to the difference between each lightning current in the lightning current subsequence and the mean value of its left and right adjacent lightning currents in combination with the lightning electromagnetic field correction coefficient; According to the amplitude spectrum and energy spectrum of the corrected lightning wave, a lightning interceptor is used to intercept lightning.

2. A lightning surge pulse protection method as claimed in claim 1, characterized in that: Each lightning current subsequence further comprises: The time series decomposition algorithm is used to obtain the trend sequence of the lightning current sequence, the extreme points of the trend sequence are detected, and the lightning current sequence is divided according to all the extreme points to obtain each lightning current subsequence.

3. A lightning surge pulse protection method as claimed in claim 1, characterized in that: The lightning change rate of each lightning current is further the absolute value of the difference between each lightning current in the lightning current subsequence and its adjacent previous lightning current.

4. A lightning surge pulse protection method as claimed in claim 1, characterized in that: The expression of the lightning electromagnetic field deviation is: In the formula, Ac i Av is the lightning electromagnetic field deviation of the i-th lightning current in the lightning current subsequence; i 、Av i-1 、Av i+1 are the lightning change rates of the i-th, i-1-th, and i+1-th lightning currents in the lightning current subsequence respectively; is the average value of the lightning change rates of all lightning currents in the lightning current subsequence; k is a preset value greater than zero.

5. A lightning surge pulse protection method as claimed in claim 1, characterized in that: The lightning electromagnetic field interference intensity of each lightning current is the product of the lightning electromagnetic field deviation and the lightning impact confidence of each lightning current.

6. A lightning surge pulse protection method as claimed in claim 5, characterized in that: The lightning impact confidence level is the absolute value of the difference between each lightning current and the average of its left and right adjacent lightning currents.

7. A lightning surge pulse protection method as claimed in claim 5, characterized in that: The lightning impact confidence of the first and last lightning currents in the lightning current subsequence are both assigned a value of 0.

8. A lightning surge pulse protection method as claimed in claim 1, characterized in that: The expression of the lightning electromagnetic field correction coefficient of each lightning current is: G i =1-exp(Tq i );where G i , Tq i It represents the lightning electromagnetic field correction coefficient and lightning electromagnetic field interference intensity of the i-th lightning current in the lightning current subsequence; exp() represents an exponential function with a natural constant as the base.

9. A lightning surge pulse protection method as claimed in claim 1, characterized in that: The correction value expression of each lightning current in the lightning current subsequence is: ′ i =A i +G i ×(MA i -A i );where A ′ i A represents the lightning current correction value of the i-th lightning current in the lightning current subsequence; i , G i Indicates the lightning electromagnetic field correction coefficient of the ith lightning current and the ith lightning current in the lightning current subsequence; MA i It represents the mean value of the left and right adjacent lightning currents of the i-th lightning current in the lightning current subsequence.

10. An intelligent lightning interceptor, comprising a memory, a processor, and a computer program stored in the memory and running on the processor, characterized in that: When the processor executes the computer program, the steps of the lightning surge pulse protection method as described in any one of claims 1-9 are implemented.

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