Lightning suppression system and lightning suppression method based on thundercloud monitoring

Abstract

The invention belongs to the technical field of thunder and lightning protection, and provides a thundercloud monitoring-based thunder and lightning suppression system and method, and the main scheme is as follows: setting a standard thunder and lightning electric field intensity threshold through a thundercloud monitoring unit, monitoring a thunder and lightning real-time electric field intensity value, and comparing the thunder and lightning real-time electric field intensity value with the standard thunder and lightning electric field intensity threshold; the lightning suppression unit is matched with the thundercloud monitoring unit, a comparison result of a lightning real-time electric field intensity value and a standard lightning electric field intensity threshold value is obtained, and when the lightning real-time electric field intensity value is lower than the standard lightning electric field intensity threshold value, the lightning suppression unit is controlled to be in a capacitance characteristic and is connected with a space capacitor in series to form a pilot channel; and when the lightning real-time electric field intensity value is higher than the standard lightning electric field intensity value, the lightning suppression unit is controlled to be in a resistance characteristic and form a lightning suppression channel with the space capacitor, and the gradient and amplitude of lightning waves are reduced through the lightning suppression channel.

Description

Technical Field

[0001] The present invention relates to the technical field of lightning protection, and in particular to a lightning suppression system and a lightning suppression method based on thundercloud monitoring. Background Art

[0002] At present, with the rapid development of the national economy and the continuous growth of stable and reliable electricity demand, the safety issues of power production are becoming more and more prominent. For transmission lines, lightning has always been an important factor affecting the reliability of power supply of high-voltage transmission lines. my country's power grid suffers more than 350,000 lightning strikes each year, and lightning faults account for as high as 47.6%. Frequent lightning strikes can cause damage to electrical equipment and even cause major safety accidents, seriously threatening the safe operation of the power grid. Therefore, it is urgent to explore the lightning response law of high-voltage transmission lines, study the impact of lightning intrusion waves on power equipment, and new methods and technologies for lightning protection to avoid or reduce lightning accidents in high-voltage transmission lines. The application research of new lightning protection technologies in high-voltage transmission lines has a good engineering application example, which will provide reference and reference for lightning protection engineering designers. Lightning strikes can cause great harm to high-altitude wind turbines and overhead collector lines. Wind turbines and collector lines are all arranged in open and high places, which also makes the equipment extremely vulnerable to lightning strikes. Lightning strikes cause line tripping and equipment damage, resulting in particularly large economic losses. As wind turbines are used at high altitudes, their capacity and height increase, and their control systems use a large number of microelectronic devices with extremely low over-field strength and over-current resistance but extremely high working efficiency, the severity of lightning damage to the units will become increasingly prominent, and the indirect economic losses caused will also increase.

[0003] Therefore, the negative impact of lightning strikes under different working conditions, especially under high-altitude wind farm conditions, needs to be addressed urgently. In addition, since the lightning process itself is complex and changeable, especially in high-altitude mountain wind farm areas, before the construction of wind farm projects, most of them are uninhabited areas, and the means of suppressing and protecting against lightning are extremely limited. Summary of the invention

[0004] The purpose of the present invention is to provide a lightning suppression system and a lightning suppression method based on thundercloud monitoring, which can realize lightning intrusion wave monitoring and effective lightning suppression under different working conditions, especially high-altitude wind farm conditions, thereby greatly improving the lightning protection level of wind turbines in wind farms and effectively reducing the occurrence of lightning damage accidents.

[0005] The present invention solves the technical problem and adopts the following technical solution: In one aspect, the present invention provides a lightning suppression system based on thundercloud monitoring, comprising: A position acquisition unit, used to obtain location information of possible lightning strikes in different lightning suppression scenarios; The thundercloud monitoring unit is used to select an installation location based on the position information where lightning strikes may occur under different lightning suppression scenarios. After installation, it is set to the always-on state and is provided with a standard lightning electric field intensity threshold, which is used to monitor the real-time lightning electric field intensity value and compare the real-time lightning electric field intensity value with the standard lightning electric field intensity threshold; The lightning suppression unit is adapted to the thundercloud monitoring unit and is used to obtain the comparison result between the real-time lightning electric field intensity value and the standard lightning electric field intensity threshold. When the real-time lightning electric field intensity value is lower than the standard lightning electric field intensity threshold, it controls the lightning suppression unit to exhibit capacitive characteristics and forms a pilot channel in series with the space capacitor to dissipate the lightning through the pilot channel. When the real-time lightning electric field intensity value is higher than the standard lightning electric field intensity value, it controls the lightning suppression unit to exhibit resistive characteristics and forms a lightning suppression channel with the space capacitor to reduce the steepness and amplitude of the lightning wave through the lightning suppression channel.

[0006] As a further optimization, the position information of the lightning strikes that have occurred is obtained through the position acquisition unit, and the position distribution information of the possible lightning strike locations is obtained, and the position information of the possible lightning strike locations is screened based on the position distribution information of the possible lightning strike locations.

[0007] As a further optimization, the screening of the position information of the possible lightning strike locations based on the position distribution information of the possible lightning strike locations means: Based on the position distribution information of the possible lightning strike locations, the position information of the power equipment where lightning strikes have occurred and the position information of the power equipment with a probability of lightning strike greater than 40% are obtained; The top positions of the power equipment where lightning strikes have occurred and the top positions of the power equipment with a probability of lightning strike greater than 40% are selected as the position information of the possible lightning strike locations.

[0008] As a further optimization, the space capacitor is denoted as C1; When the real-time lightning electric field intensity value is lower than the standard lightning electric field intensity threshold, the lightning pilot channel includes the space capacitor C1, the first capacitor C2, and the inductor L, and the lightning is dissipated into the ground through the space capacitor C1, the first capacitor C2, and the inductor; When the real-time lightning electric field intensity value is higher than the standard lightning electric field intensity value, the lightning suppression channel includes the space capacitor C1, the adjustable resistor R, and the inductor L, and the lightning is conducted into the ground through the space capacitor C1, the adjustable resistor R, and the inductor L.

[0009] As a further optimization, the adjustable resistor R is made of a zinc oxide element.

[0010] On the other hand, the present invention also provides a lightning suppression method based on thundercloud monitoring, which is applied to the lightning suppression system based on thundercloud monitoring and includes the following steps: The location information of possible lightning strikes in different lightning suppression scenarios is obtained through a location acquisition unit; The thundercloud monitoring unit selects the installation location based on the location information of possible lightning strikes in different lightning suppression scenarios. After installation, it is set to the normal start state and set with a standard lightning electric field strength threshold to monitor the real-time lightning electric field strength value and compare the real-time lightning electric field strength value with the standard lightning electric field strength threshold; The lightning suppression unit is adapted to the thundercloud monitoring unit, and the comparison result between the real-time lightning electric field strength value and the standard lightning electric field strength threshold is obtained; When the real-time electric field strength value of lightning is lower than the standard lightning electric field strength threshold, the lightning suppression unit is controlled to present a capacitive characteristic and connected in series with the space capacitor to form a pilot channel to dissipate lightning through the pilot channel; When the real-time lightning electric field strength value is higher than the standard lightning electric field strength value, the lightning suppression unit is controlled to present a resistance characteristic and form a lightning suppression channel with the space capacitor, so that the lightning is passed through the lightning suppression channel to reduce the steepness and amplitude of the lightning wave.

[0011] The beneficial effects of the present invention are as follows: through the above-mentioned lightning suppression system and lightning suppression method based on thundercloud monitoring, firstly, the position information of possible lightning strikes in different lightning suppression scenarios is obtained through the position acquisition unit, and then, the installation position is selected based on the position information of possible lightning strikes in different lightning suppression scenarios through the thundercloud monitoring unit. After the installation is completed, it is set to a normal start state, and a standard lightning electric field strength threshold is set to monitor the real-time lightning electric field strength value, and the real-time lightning electric field strength value is compared with the standard lightning electric field strength threshold; finally, the lightning The suppression unit is adapted to the thundercloud monitoring unit, and obtains the comparison result between the real-time electric field strength value of lightning and the standard lightning electric field strength threshold. When the real-time electric field strength value of lightning is lower than the standard lightning electric field strength threshold, the lightning suppression unit is controlled to have a capacitive characteristic, and is connected in series with the space capacitor to form a pilot channel, and the lightning is dissipated through the pilot channel. When the real-time electric field strength value of lightning is higher than the standard lightning electric field strength value, the lightning suppression unit is controlled to have a resistive characteristic, and is formed with the space capacitor to form a lightning suppression channel, and the lightning is passed through the lightning suppression channel to reduce the steepness and amplitude of the lightning wave.

[0012] On the one hand, the location and time of lightning strike can be predicted more accurately, and the hardware investment cost will not be wasted due to the installation of too many lightning suppression units. On the other hand, under different lightning electric field strengths, if the lightning electric field strength is relatively low, the lightning can be directly introduced into the earth. At this time, the pilot channel is directly opened to dissipate the lightning. If the lightning electric field strength is relatively high, the lightning cannot be directly introduced into the earth. At this time, the lightning suppression channel can be opened to suppress the high-voltage lightning, thereby reducing the steepness and amplitude of the lightning wave, and reducing the damage to the power equipment at the lightning strike location when lightning occurs. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 Schematic diagram of the structure of a lightning suppression system based on thundercloud monitoring in Example 1 of the present invention; Figure 2 is a schematic diagram of an equivalent circuit when lightning occurs in this embodiment 1; Figure 3 This is a flow chart of a lightning suppression method based on thundercloud monitoring in Example 2 of the present invention.

[0014] Wherein, C1 represents space capacitance, C2 represents first capacitance, R represents adjustable resistance, and L represents inductance. DETAILED DESCRIPTION

[0015] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Generally, the components of the embodiments of the present invention described and shown in the drawings here can be arranged and designed in various different configurations.

[0016] Example 1

[0017] This embodiment provides a lightning suppression system based on thundercloud monitoring, and its composition and structure diagram is shown in Figure 1 , wherein the method comprises: A position acquisition unit, used to obtain location information of possible lightning strikes in different lightning suppression scenarios; The thundercloud monitoring unit is used to select the installation location based on the location information of possible lightning strikes in different lightning suppression scenarios. After installation, it is set to the normal start state and is set with a standard lightning electric field strength threshold. It is used to monitor the real-time lightning electric field strength value and compare the real-time lightning electric field strength value with the standard lightning electric field strength threshold; The lightning suppression unit is adapted to the thundercloud monitoring unit and is used to obtain the comparison result between the real-time lightning electric field strength value and the standard lightning electric field strength threshold. When the real-time lightning electric field strength value is lower than the standard lightning electric field strength threshold, the lightning suppression unit is controlled to have a capacitive characteristic and is connected in series with the space capacitor to form a pilot channel to dissipate the lightning through the pilot channel. When the real-time lightning electric field strength value is higher than the standard lightning electric field strength value, the lightning suppression unit is controlled to have a resistive characteristic and is formed with the space capacitor to form a lightning suppression channel to reduce the steepness and amplitude of the lightning wave through the lightning suppression channel.

[0018] For different situations where lightning may occur, taking wind power equipment as an example, if a lightning suppression unit is installed on the top of each wind power equipment, the installation density problem needs to be considered. If the installation density is too low, lightning protection cannot be effectively achieved. If the installation density is too high, the hardware investment cost will be too high. Therefore, in this embodiment, in order to accurately respond to the damage to power equipment caused by lightning strikes and to reduce the hardware investment cost as much as possible, it is necessary to know in advance the specific location information of the installation of the lightning suppression unit. Therefore, in this embodiment, more accurate location information of lightning strikes that have occurred and location information of lightning strikes that may occur can be obtained through the location acquisition unit. Therefore, in this embodiment, the location information of lightning strikes that have occurred is obtained through the location acquisition unit, and the location distribution information of lightning strikes that may occur is obtained, and the location information of lightning strikes that may occur is screened out based on the location distribution information of lightning strikes that may occur.

[0019] Here, the filtering out of the location information where lightning strikes may occur based on the distribution information of the locations where lightning strikes may occur specifically refers to: Based on the distribution information of the locations where lightning strikes may occur, obtain the location information of the power equipment where lightning strikes have occurred, as well as the location information of the power equipment where the probability of lightning strikes occurring is greater than 40%; The top position of the electric equipment where lightning strike has occurred and the top position of the electric equipment where the probability of lightning strike occurring is greater than 40% are selected as the position information where lightning strike may occur.

[0020] It should be pointed out that since the position of thunderclouds changes with the weather and it is difficult for them to be in a fixed position, when different thunderclouds change, the real-time electric field strength values ​​of lightning emitted by them will also change accordingly. Therefore, for the above two situations in which the pilot channel and the lightning suppression channel eliminate lightning or reduce lightning damage, it is necessary to record the specific thundercloud position and the corresponding real-time electric field strength value of lightning, so as to record the frequency of use of the lightning suppression unit to guide the later maintenance of the lightning suppression unit. Therefore, in this embodiment, when monitoring the real-time electric field strength value of lightning, the thundercloud monitoring unit records the first thundercloud position information and the first real-time electric field strength value of lightning when the real-time electric field strength value of lightning is lower than the standard lightning electric field threshold, and stores them in the first storage list according to the recording sequence, and records the second thundercloud position information and the second real-time electric field strength value of lightning when the real-time lightning intensity value is higher than the standard lightning intensity threshold, and stores them in the second storage list according to the recording sequence.

[0021] At the same time, in order to provide installation guidance for lightning suppression units for other working conditions, it is also necessary to realize real-time synchronization of lightning elimination or lightning suppression by the meteorological system. Therefore, in this embodiment, the first thundercloud location information and the first lightning real-time electric field strength value in the first storage list, and the second thundercloud location information and the second lightning real-time electric field strength value in the second storage list.

[0022] For specific application, see Figure 2 The equivalent circuit diagram when lightning occurs is shown in the figure, wherein the space capacitor can be represented as C1; when the real-time electric field strength value of lightning is lower than the standard lightning electric field strength threshold, the lightning leader channel includes the space capacitor C1, the first capacitor C2 and the inductor L, and the lightning is introduced into the earth and dissipated through the space capacitor C1, the first capacitor C2 and the inductor; when the real-time electric field strength value of lightning is higher than the standard lightning electric field strength value, the lightning suppression channel includes the space capacitor C1, the adjustable resistor R and the inductor L, and the lightning is introduced into the earth through the space capacitor C1, the adjustable resistor R and the inductor L.

[0023] As a preferred embodiment, the adjustable resistor R can be made of zinc oxide element.

[0024] Example 2

[0025] Based on Example 1, this embodiment provides a lightning suppression method based on thundercloud monitoring. Figure 3 , wherein the method comprises the steps of: S1. Acquire location information of possible lightning strikes in different lightning suppression scenarios through a location acquisition unit; S2. Select an installation location based on the location information of possible lightning strikes in different lightning suppression scenarios through the thundercloud monitoring unit. After installation, set it to a normal start state and set a standard lightning electric field strength threshold to monitor the real-time lightning electric field strength value and compare the real-time lightning electric field strength value with the standard lightning electric field strength threshold; S3, adapting the lightning suppression unit to the thundercloud monitoring unit, and obtaining a comparison result between the real-time lightning electric field strength value and the standard lightning electric field strength threshold; S4. When the real-time electric field strength value of lightning is lower than the standard lightning electric field strength threshold, the lightning suppression unit is controlled to have a capacitive characteristic and connected in series with the space capacitor to form a pilot channel to dissipate lightning through the pilot channel; S5. When the real-time lightning electric field strength value is higher than the standard lightning electric field strength value, the lightning suppression unit is controlled to present a resistance characteristic and form a lightning suppression channel with the space capacitor to reduce the steepness and amplitude of the lightning wave through the lightning suppression channel.

[0026] Based on the description of Example 1, it can be seen that the application conditions and implementation principles of this embodiment are consistent with those of Example 1, and therefore will not be described in detail.

[0027] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lightning suppression system based on thundercloud monitoring, characterized in that: include: A position acquisition unit, used to obtain location information of possible lightning strikes in different lightning suppression scenarios; The thundercloud monitoring unit is used to select the installation location based on the location information of possible lightning strikes in different lightning suppression scenarios. After installation, it is set to the normal start state and is set with a standard lightning electric field strength threshold. It is used to monitor the real-time lightning electric field strength value and compare the real-time lightning electric field strength value with the standard lightning electric field strength threshold; The lightning suppression unit is adapted to the thundercloud monitoring unit and is used to obtain the comparison result between the real-time lightning electric field strength value and the standard lightning electric field strength threshold. When the real-time lightning electric field strength value is lower than the standard lightning electric field strength threshold, the lightning suppression unit is controlled to have a capacitive characteristic and is connected in series with the space capacitor to form a pilot channel to dissipate the lightning through the pilot channel. When the real-time lightning electric field strength value is higher than the standard lightning electric field strength value, the lightning suppression unit is controlled to have a resistive characteristic and is formed with the space capacitor to form a lightning suppression channel to reduce the steepness and amplitude of the lightning wave through the lightning suppression channel.

2. The lightning suppression system based on thundercloud monitoring according to claim 1 is characterized in that: The location information of the lightning strike that has occurred is obtained by the location acquisition unit, and the location distribution information of the possible lightning strike is obtained, and the location information of the possible lightning strike is screened out based on the location distribution information of the possible lightning strike.

3. The lightning suppression system based on thundercloud monitoring according to claim 2 is characterized in that: The filtering out of the location information where lightning strikes may occur based on the distribution information of the locations where lightning strikes may occur refers to: Based on the distribution information of the locations where lightning strikes may occur, obtain the location information of the power equipment where lightning strikes have occurred, as well as the location information of the power equipment where the probability of lightning strikes occurring is greater than 40%; The top position of the electric equipment where lightning strike has occurred and the top position of the electric equipment where the probability of lightning strike occurring is greater than 40% are selected as the position information where lightning strike may occur.

4. The lightning suppression system based on thundercloud monitoring according to claim 1 is characterized in that: The space capacitance is represented by C1; When the real-time electric field strength value of lightning is lower than the standard lightning electric field strength threshold, the lightning leader channel includes the space capacitor C1, the first capacitor C2 and the inductor L, and the lightning is introduced into the earth and dissipated through the space capacitor C1, the first capacitor C2 and the inductor; When the real-time lightning electric field strength value is higher than the standard lightning electric field strength value, the lightning suppression channel includes the space capacitor C1, the adjustable resistor R and the inductor L, and the lightning is introduced into the earth through the space capacitor C1, the adjustable resistor R and the inductor L.

5. The lightning suppression system based on thundercloud monitoring according to claim 4 is characterized in that: The adjustable resistor R is made of zinc oxide elements.

6. A lightning suppression method based on thundercloud monitoring, applied to a lightning suppression system based on thundercloud monitoring according to any one of claims 1 to 5, characterized in that: The steps include: The location information of possible lightning strikes in different lightning suppression scenarios is obtained through a location acquisition unit; The thundercloud monitoring unit selects the installation location based on the location information of possible lightning strikes in different lightning suppression scenarios. After installation, it is set to the normal start state and set with a standard lightning electric field strength threshold to monitor the real-time lightning electric field strength value and compare the real-time lightning electric field strength value with the standard lightning electric field strength threshold; The lightning suppression unit is adapted to the thundercloud monitoring unit, and the comparison result between the real-time lightning electric field strength value and the standard lightning electric field strength threshold is obtained; When the real-time electric field strength value of lightning is lower than the standard lightning electric field strength threshold, the lightning suppression unit is controlled to present a capacitive characteristic and connected in series with the space capacitor to form a pilot channel to dissipate lightning through the pilot channel; When the real-time lightning electric field strength value is higher than the standard lightning electric field strength value, the lightning suppression unit is controlled to present a resistance characteristic and form a lightning suppression channel with the space capacitor, so that the lightning is passed through the lightning suppression channel to reduce the steepness and amplitude of the lightning wave.

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