A method for determining the PLP protection range of double-branch non-equal-height photovoltaic stations based on the rolling ball method

Abstract

The present application relates to the technical field of power system protection, and in particular to a method for determining the protection range of two non-equal-height PLPs in a photovoltaic station based on the rolling ball method. The method comprises: calculating the protection radius of the PLP on the ground according to the installation height and rolling ball radius of the PLP; determining the spacing between the first PLP and the second PLP; when the spacing is less than twice the protection radius, determining the slope tangent value between the first PLP and the second PLP according to the protection radius and the rolling ball radius; calculating the first zone protection range, the second zone protection range and the third zone protection range respectively according to the installation height, protection radius, rolling ball radius, spacing and / or slope tangent value; determining the common protection range of the first PLP and the second PLP according to the first zone protection range, the second zone protection range and the third zone protection range. It aims to solve the problem of how to calculate the joint protection range of the two when the protection ranges between two non-equal-height PLPs in a photovoltaic station overlap.

Description

Technical Field

[0001] The present application relates to the technical field of power system protection, and in particular to a method for determining a double-branch non-equal-height PLP protection range of a photovoltaic station based on a rolling ball method. Background Art

[0002] As the photovoltaic industry continues to develop rapidly, the application of solar photovoltaic industry is becoming more and more extensive, and the accompanying lightning hazards and lightning protection work of photovoltaic power stations also need to be paid attention to. Lightning poses a huge threat to the safe operation of solar photovoltaic power stations. When lightning directly hits the solar panel, it will directly destroy the equipment and cause the system to paralyze; lightning electromagnetic pulses will generate overvoltage in the power circuit of the photovoltaic system and damage electrical equipment.

[0003] Among the relevant technical solutions, a new type of lightning protection device has been proposed - Plasma Lightning Protector (PLP), which has a good effect in lightning protection. It uses the "tip-like effect" to make its own electric field strength under the thundercloud two orders of magnitude higher than the protected object, and attracts the thundercloud charge, so that the protected target is in a safe position with a relatively low electric field. It also adopts an induction array anti-lightning rod and a dielectric barrier strong ionization composite discharger, and uses the thundercloud electric field to achieve passive strong ionization. The strong ionization discharger generates and radiates high-concentration plasma in both directions from cloud to ground, and efficiently neutralizes the thundercloud charge attracted by the anti-lightning rod, solving the fatal problem that the electric field self-shielding effect of the traditional lightning arrester array needle suppresses the increase of divergent current and is easily struck by lightning.

[0004] Traditional lightning protection devices have one thing in common when calculating their lightning protection range, that is, the higher the lightning rod, the wider its protection range, but in the PLP lightning protection of photovoltaic production stations in plateau mountains, due to the influence of the installation location, the protection range of its related equipment is quite different from the protection range in traditional plain scenes. In the process of conceiving and realizing this application, the inventor found that one of the reasons for this difference is that the installation of photovoltaic equipment in plateau mountains is affected by the intensity of sunlight, and its installation location needs to be installed on an uphill slope with a certain slope, while the traditional lightning protection range only makes a certain interpretation for the protection range of horizontal ground, and ignores the influence of the slope on the protection range. Therefore, a method for determining the protection range of double-branch non-equal height PLP in photovoltaic stations is needed to improve the calculation accuracy of the lightning protection range of PLP.

[0005] The above contents are only used to assist in understanding the technical solution of the present application and do not constitute an admission that the above contents are prior art. Summary of the invention

[0006] The main purpose of this application is to provide a method for determining the protection range of two non-equal-height PLPs in a photovoltaic station based on the rolling ball method, aiming to solve the problem of how to calculate the joint protection range of the two when the protection ranges of two non-equal-height PLPs in a photovoltaic station overlap.

[0007] To achieve the above purpose, the present application provides a method for determining the PLP protection range of two non-equal height photovoltaic stations based on the rolling ball method, the method comprising:

[0008] Calculate the protection radius of the PLP on the ground according to the installation height of the PLP and the rolling ball radius;

[0009] Determine a distance between a first PLP and a second PLP, wherein the slope of the slope at which the first PLP is located is higher than that of the second PLP;

[0010] When the spacing is less than twice the protection radius, determining the slope tangent value of the slope between the first PLP and the second PLP according to the protection radius and the rolling ball radius;

[0011] According to the installation height, the protection radius, the rolling ball radius, the spacing and / or the slope tangent value of the inclined plane, respectively calculate the first zone protection range, the second zone protection range and the third zone protection range, wherein the first zone protection range is the protection range on the left side of the first PLP, the second zone protection range is the protection range between the first PLP and the second PLP, and the third zone protection range is the protection range on the right side of the second PLP;

[0012] According to the first area protection range, the second area protection range and the third area protection range, a common protection range of the first PLP and the second PLP is determined.

[0013] Optionally, the first zone protection range is referenced by a reference plane of the equipment installation location, the first zone protection range is associated with the rolling ball radius and the slope of the inclined plane, the first zone protection range includes a first minimum protection radius and a first maximum protection height corresponding to the first minimum protection radius, and the calculation expressions of the first minimum protection and the first maximum protection height are:

[0014]

[0015]

[0016] In the formula, is the first minimum protection radius, is the first maximum protection height, is the slope tangent value of the inclined plane, To protect the radius, is the rolling ball radius.

[0017] Optionally, the second zone protection range is associated with the spacing, and the second zone protection range includes a second minimum protection radius, a second maximum protection height corresponding to the second protection radius, and a second minimum protection width, and the calculation expressions of the second maximum protection height and the second minimum protection width are:

[0018]

[0019]

[0020] In the formula, is the second maximum protection height, is the second minimum protection width, is the second minimum protection radius, is the slope tangent value of the inclined plane, To protect the radius, is the rolling ball radius, h is the installation height of PLP, D is the distance between the first PLP and the second PLP.

[0021] Optionally, the horizontal protection range of the third zone protection range is the projection of the protection radius of the second PLP on the horizontal plane, the third zone protection range includes a third minimum protection radius, and a third maximum protection height corresponding to the third minimum protection radius, and the calculation expression of the third maximum protection height is:

[0022]

[0023] In the formula, is the third maximum protection height, is the third minimum protection radius, To protect the radius, is the rolling ball radius.

[0024] Optionally, the calculation expression of the protection radius is:

[0025]

[0026] Where r0 is the protection radius of PLP on the ground, h is the installation height of PLP, and h r is the rolling ball radius.

[0027] Optionally, the calculation expression of the slope tangent value is:

[0028]

[0029] In the formula, is the slope tangent value of the inclined plane, To protect the radius, is the rolling ball radius.

[0030] Optionally, the value of the rolling ball radius is associated with lightning strike density, terrain, region, and lightning protection level.

[0031] Optionally, the protection range of the PLP on the horizontal plane is a concentric circle cluster, and the value of the protection radius of the PLP on the horizontal plane is associated with the protection height of the PLP on the vertical plane.

[0032] Optionally, after the step of determining the spacing between the first PLP and the second PLP, the method further includes:

[0033] When the distance is greater than or equal to twice the protection radius, the protection range of the first PLP and the protection range of the second PLP are determined respectively based on a single PLP protection range calculation strategy.

[0034] This application has at least the following beneficial effects:

[0035] 1. When the distance D between two PLPs is less than twice the protection radius of the PLP on the ground, there is no dead zone in the longitudinal protection height between the two PLP devices. Compared with a single PLP, its protection range is significantly enhanced.

[0036] 2. In photovoltaic equipment sites with slopes, different protection ranges are divided along the slope direction, and different influencing parameters are determined for the protection range of each area, making the protection more targeted.

[0037] 3. Where the protection ranges of the two PLPs overlap, determine the minimum protection width of the two PLPs on each side of the ground by calculating the half-chord length of the arc of the intersection of the two pin protection ranges. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] Figure 1 A schematic diagram of the architecture of the hardware operating environment of the dual-branch non-equal-height PLP protection range calculation system involved in the embodiment of the present application;

[0039] Figure 2 This is a flow chart of the first embodiment of the method for determining the PLP protection range of two non-equal-height branches of a photovoltaic station based on the rolling ball method of the present application;

[0040] Figure 3 A schematic diagram of a single PLP protection range involved in an embodiment of the present application;

[0041] Figure 4 A schematic diagram of the slope surface and PLP coordinates involved in the embodiment of the present application;

[0042] Figure 5It is a schematic diagram of the projection of the protection range of two non-equal-height PLPs on the horizontal plane according to the rolling ball method involved in an embodiment of the present application.

[0043] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0044] In order to better understand the above technical solution, exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments described herein. On the contrary, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0045] As an implementation plan, Figure 1 This is a schematic diagram of the architecture of the hardware operating environment of the dual-branch non-equal-height PLP protection range calculation system involved in the embodiment of the present application.

[0046] like Figure 1 As shown, the dual-branch non-equal height PLP protection range calculation system may include: a processor 1001, such as a CPU, a memory 1005, a user interface 1003, a network interface 1004, and a communication bus 1002. Among them, the communication bus 1002 is used to realize the connection and communication between these components. The user interface 1003 may include a display screen (Display), an input unit such as a keyboard (Keyboard), and the optional user interface 1003 may also include a standard wired interface and a wireless interface. The network interface 1004 may optionally include a standard wired interface and a wireless interface (such as a WI-FI interface). The memory 1005 may be a high-speed RAM memory, or a stable memory (non-volatile memory), such as a disk memory. The memory 1005 may also be a storage device independent of the aforementioned processor 1001.

[0047] Those skilled in the art will understand that Figure 1 The dual-branch non-equal-height PLP protection range calculation system architecture shown in the figure does not constitute a limitation on the dual-branch non-equal-height PLP protection range calculation system, and may include more or fewer components than shown in the figure, or a combination of certain components, or a different arrangement of components.

[0048] like Figure 1As shown, the memory 1005 as a storage medium may include an operating system, a network communication module, a user interface module, and a photovoltaic field station double-branch non-equal-height PLP protection range determination program based on the rolling ball method. Among them, the operating system is a program for managing and controlling the hardware and software resources of the double-branch non-equal-height PLP protection range calculation system, the photovoltaic field station double-branch non-equal-height PLP protection range determination program based on the rolling ball method, and the operation of other software or programs.

[0049] exist Figure 1 In the double-branch non-equal-height PLP protection range calculation system shown, the user interface 1003 is mainly used to connect the terminal and communicate data with the terminal; the network interface 1004 is mainly used for the background server and communicates data with the background server; the processor 1001 can be used to call the photovoltaic station double-branch non-equal-height PLP protection range determination program based on the rolling ball method stored in the memory 1005.

[0050] In this embodiment, the double-branch non-equal-height PLP protection range calculation system includes: a memory 1005, a processor 1001, and a photovoltaic station double-branch non-equal-height PLP protection range determination program based on the rolling ball method stored in the memory and executable on the processor, wherein:

[0051] When the processor 1001 calls the rolling ball method-based photovoltaic station double-branch non-equal-height PLP protection range determination program stored in the memory 1005, the following operations are performed:

[0052] Calculate the protection radius of the PLP on the ground according to the installation height of the PLP and the rolling ball radius;

[0053] Determine a distance between a first PLP and a second PLP, wherein the slope of the slope at which the first PLP is located is higher than that of the second PLP;

[0054] When the spacing is less than twice the protection radius, determining the slope tangent value of the slope between the first PLP and the second PLP according to the protection radius and the rolling ball radius;

[0055] According to the installation height, the protection radius, the rolling ball radius, the spacing and / or the slope tangent value of the inclined plane, respectively calculate the first zone protection range, the second zone protection range and the third zone protection range, wherein the first zone protection range is the protection range on the left side of the first PLP, the second zone protection range is the protection range between the first PLP and the second PLP, and the third zone protection range is the protection range on the right side of the second PLP;

[0056] According to the first area protection range, the second area protection range and the third area protection range, a joint protection range of the first PLP and the second PLP is determined.

[0057] When the processor 1001 calls the rolling ball method-based photovoltaic station double-branch non-equal-height PLP protection range determination program stored in the memory 1005, the following operations are performed:

[0058] When the distance is greater than or equal to twice the protection radius, the protection range of the first PLP and the protection range of the second PLP are determined respectively based on a single PLP protection range calculation strategy.

[0059] Based on the hardware architecture of the double-branch non-equal-height PLP protection range calculation system of the above-mentioned power system protection technology, an embodiment of the method for determining the double-branch non-equal-height PLP protection range of a photovoltaic station based on the rolling ball method of the present application is proposed.

[0060] First embodiment

[0061] Reference Figure 2 In the first embodiment, the method for determining the protection range of the double-branch non-equal-height PLP of a photovoltaic station based on the rolling ball method includes the following steps:

[0062] Step S10, calculating the protection radius of the PLP on the ground according to the installation height of the PLP and the rolling ball radius;

[0063] In this embodiment, any PLP in a photovoltaic station is selected, whose installation height and rolling ball radius are known quantities, and its protection radius on the ground is calculated.

[0064] Optionally, refer to Figure 3 The schematic diagram of the protection range of a single PLP is shown, and the calculation expression of the protection radius is:

[0065] (1)

[0066] Where r0 is the protection radius of PLP on the ground, h is the installation height of PLP, and h r is the rolling ball radius.

[0067] Further and optionally, the value of the rolling ball radius is associated with the lightning strike density, terrain, region, and lightning protection level. In some specific embodiments, the rolling ball radius can be 60 meters.

[0068] Step S20, determining the distance between the first PLP and the second PLP, wherein the slope of the slope at the location of the first PLP is higher than that of the second PLP;

[0069] Step S30, when the spacing is less than twice the protection radius, determining the slope tangent value between the first PLP and the second PLP according to the protection radius and the rolling ball radius;

[0070] In this embodiment, the distance D between the first PLP and the second PLP is a preset value, which can be measured on site or directly determined by the spacing distance between the first PLP and the second PLP recorded in the system.

[0071] When the spacing is less than twice the protection radius, the rolling ball method radius is judged to be continuous, and the first PLP installation position is taken as the origin, and the spacing D between the first PLP and the second PLP is less than twice r0, and the following is established: Figure 4 The schematic diagram of the hillside surface and PLP coordinates is shown, wherein the slope of the slope where the first PLP is located is higher than that of the second PLP.

[0072] Assume the coordinates of the center of the rolling ball method are (X=-r o , Y = h r ), take the slope angle as θ, and construct the rolling ball circle equation and the slope steepness equation:

[0073] (2)

[0074] (3)

[0075] The calculation expression of the slope tangent value is:

[0076] (4)

[0077] In the formula, is the slope tangent value of the inclined plane, To protect the radius, is the rolling ball radius.

[0078] It should be noted that when the distance D between the two PLPs is greater than twice r0, the radius of the rolling ball method is discontinuous. Since the protection range on the left side of the PLP is affected by the rolling ball radius and the slope at the same time, an unprotected area appears inside the two PLPs, that is, a protection dead zone. The single PLP protection range calculation strategy is adopted to determine the protection range of the first PLP and the protection range of the second PLP respectively.

[0079] Among them, the single PLP protection range calculation strategy is an existing technology and will not be repeated here.

[0080] Step S40, respectively calculating a first zone protection range, a second zone protection range, and a third zone protection range according to the installation height, the protection radius, the rolling ball radius, the spacing, and / or the slope tangent value of the slope, wherein the first zone protection range is a protection range on the left side of the first PLP, the second zone protection range is a protection range between the first PLP and the second PLP, and the third zone protection range is a protection range on the right side of the second PLP;

[0081] After calculating the tangent value of the slope, combined with the installation height, protection radius, rolling ball radius, spacing and / or tangent value of the slope solved in the previous steps, calculate the first zone protection range located on the left side of the first PLP, the second zone protection range located between the first PLP and the second PLP, and the third zone protection range located on the right side of the second PLP.

[0082] Optionally, for solving the first zone protection range, the first zone protection range is referenced by a reference plane of the equipment installation location, the first zone protection range is associated with the rolling ball radius and the slope of the slope, the first zone protection range includes a first minimum protection radius, and a first maximum protection height corresponding to the first minimum protection radius, and the calculation expressions of the first minimum protection and the first maximum protection height are:

[0083] (5)

[0084] (6)

[0085] In the formula, is the first minimum protection radius, is the first maximum protection height, is the slope tangent value of the inclined plane, To protect the radius, is the rolling ball radius.

[0086] Optionally, for solving the protection range of the second zone, assume that the coordinates of any point on the rolling ball are (a, b), where the coordinates of point a are the minimum protection radius of the first PLP in the protection range of the second zone. ,Right now .

[0087] Press the formula:

[0088] (7)

[0089] (8)

[0090] (9)

[0091] Arranging (7), (8), and (9), we obtain:

[0092] (10)

[0093] Optionally, within the protection range of the second zone, the minimum protection width of the two PLPs on each side of the ground is determined, that is, the second minimum protection width is the half chord length of the arc of the intersection of the protection ranges between the two PLPs. Therefore, the calculation expression of the second minimum protection width is:

[0094] (11)

[0095] In the formula, is the second maximum protection height, is the second minimum protection width, is the second minimum protection radius, is the slope tangent value of the inclined plane, To protect the radius, is the rolling ball radius, h is the installation height of PLP, D is the distance between the first PLP and the second PLP.

[0096] Optionally, the horizontal protection range of the third zone protection range is the projection of the protection radius of the second PLP on the horizontal plane, the third zone protection range includes a third minimum protection radius, and a third maximum protection height corresponding to the third minimum protection radius, and the calculation expression of the third maximum protection height is:

[0097] (12)

[0098] In the formula, is the third maximum protection height, is the third minimum protection radius, To protect the radius, is the rolling ball radius.

[0099] It should be noted that, refer to Figure 3 Based on the maximum protection height and / or minimum protection radius corresponding to each area solved above, the geometric area of ​​the shadow of each area can be further calculated. The geometric area is approximately the protection range corresponding to each area of ​​two non-equal-height PLPs.

[0100] Step S50: Determine a joint protection range of the first PLP and the second PLP according to the first area protection range, the second area protection range and the third area protection range.

[0101] In this embodiment, the range formed by the calculated first area protection range, the second area protection range and the third area protection range is determined as the joint protection range of the first PLP and the second PLP.

[0102] In addition, further and optionally, reference Figure 5 The figure shows a schematic diagram of the projection of the protection range of two non-equal-height PLPs on the horizontal plane using the rolling ball method. The protection range of the PLP on the horizontal plane is a concentric circle cluster, and the value of the protection radius of the PLP on the horizontal plane is associated with the protection height of the PLP on the vertical plane.

[0103] In the technical solution provided in this embodiment, a method for determining the protection range of double-branch non-equal-height PLP of a photovoltaic station based on the rolling ball method is proposed. By dividing the lightning protection area of ​​the photovoltaic station, a protection range model for different parameters is established to make the protection more targeted.

[0104] Second embodiment

[0105] Based on the first embodiment, in this embodiment, the rolling ball radius h is taken r equal to 60m, PLP installation height equal to 30m, is 30°.

[0106] Substituting into formula (1), we get the single PLP protection radius r0 to be 51.96 m.

[0107] Substituting into formula (5), we can calculate the minimum protection radius r within the protection range of the first zone: x =18m.

[0108] Substituting into (6), calculate the first maximum protection height h within the protection range of the first zone x =10.4m.

[0109] Third embodiment

[0110] Based on the first embodiment, in this embodiment, the rolling ball radius h is taken r equal to 60m, PLP installation height equal to 30m, is 30°, =30m.

[0111] Substituting into formula (1), we get the single PLP protection radius r0 to be 51.96 m.

[0112] Substituting into (7), we can calculate b = 4.2m;

[0113] Substituting into (8), we can calculate c = -17.3m;

[0114] Substituting into (9), the second maximum protection height h can be calculated x =21.5m.

[0115] Fourth embodiment

[0116] Based on the first embodiment, in this embodiment, the rolling ball radius h is taken r equal to 60m, PLP installation height equal to 30m, It is 30°, and the distance between the first PLP and the second PLP satisfies that it is less than twice the protection radius r0, and D=60m is taken.

[0117] Substituting into the above formula 11, the minimum protection width of PLP on each side of the ground can be obtained as b0=42.4m.

[0118] Fifth embodiment

[0119] Based on the first embodiment, in this embodiment, the rolling ball radius h is taken r equal to 60m, PLP installation height equal to 30m, is 30°, is 15m.

[0120] Substituting into formula (1), we get the single PLP protection radius r0 to be 51.96 m.

[0121] Substituting into (12), the third maximum protection height h can be calculated x =21.4m.

[0122] In addition, it can be understood by a person skilled in the art that all or part of the processes in the method for implementing the above embodiment can be completed by instructing the relevant hardware through a computer program. The computer program includes program instructions, and the computer program can be stored in a storage medium, which is a computer-readable storage medium. The program instructions are executed by at least one processor in the dual-branch non-equal height PLP protection range calculation system to implement the process steps of the embodiment of the above method.

[0123] Therefore, the present application also provides a computer-readable storage medium, which stores a program for determining the PLP protection range of two branches of photovoltaic stations with non-equal heights based on the rolling ball method. When the program for determining the PLP protection range of two branches of photovoltaic stations with non-equal heights based on the rolling ball method is executed by a processor, it implements the various steps of the method for determining the PLP protection range of two branches of photovoltaic stations with non-equal heights based on the rolling ball method as described in the above embodiment.

[0124] The computer-readable storage medium may be a USB flash drive, a mobile hard disk, a read-only memory (ROM), a magnetic disk, or an optical disk, etc., which are computer-readable storage media that can store program codes.

[0125] It should be noted that since the storage medium provided in the embodiment of the present application is the storage medium used to implement the method of the embodiment of the present application, based on the method introduced in the embodiment of the present application, the person skilled in the art can understand the specific structure and deformation of the storage medium, so it is not repeated here. All storage media used in the method of the embodiment of the present application belong to the scope of protection of this application.

[0126] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems or computer program products. Therefore, the present application may take the form of a complete hardware embodiment, a complete software embodiment or an embodiment combining software and hardware. Moreover, the present application may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program codes.

[0127] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems) and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0128] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0129] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0130] It should be noted that in the claims, any reference signs placed between brackets shall not be construed as limiting the claims. The word "comprising" does not exclude the presence of components or steps not listed in the claim. The word "a" or "an" preceding a component does not exclude the presence of a plurality of such components. The present application may be implemented by means of hardware comprising several different components and by means of a suitably programmed computer. In a unit claim enumerating several means, several of these means may be embodied by the same item of hardware. The use of the words first, second, and third etc. does not indicate any order. These words may be interpreted as names.

[0131] Although the preferred embodiments of the present application have been described, those skilled in the art may make additional changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0132] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A method for determining the protection range of double-branch non-equal-height PLPs in a photovoltaic station based on a rolling ball method, characterized in that: Applied to a photovoltaic station provided with at least two PLPs of unequal heights, the method comprises the following steps: Calculate the protection radius of the PLP on the ground according to the installation height of the PLP and the rolling ball radius; Determine a distance between a first PLP and a second PLP, wherein the slope of the slope at which the first PLP is located is higher than that of the second PLP; When the spacing is less than twice the protection radius, determining the slope tangent value of the slope between the first PLP and the second PLP according to the protection radius and the rolling ball radius; According to the installation height, the protection radius, the rolling ball radius, the spacing and / or the slope tangent value of the inclined plane, respectively calculate the first zone protection range, the second zone protection range and the third zone protection range, wherein the first zone protection range is the protection range on the left side of the first PLP, the second zone protection range is the protection range between the first PLP and the second PLP, and the third zone protection range is the protection range on the right side of the second PLP; Determine, according to the first area protection range, the second area protection range and the third area protection range, a joint protection range of the first PLP and the second PLP; The first zone protection range is referenced by the reference plane of the equipment installation location. The first zone protection range is associated with the rolling ball radius and the slope of the slope. The first zone protection range includes a first minimum protection radius and a first maximum protection height corresponding to the first minimum protection radius. The calculation expressions of the first minimum protection and the first maximum protection height are: ； ； In the formula, is the first minimum protection radius, is the first maximum protection height, is the slope tangent value of the inclined plane, To protect the radius, is the rolling ball radius; The second zone protection range is associated with the spacing, and the second zone protection range includes a second minimum protection radius, a second maximum protection height corresponding to the second minimum protection radius, and a second minimum protection width. The calculation expressions of the second maximum protection height and the second minimum protection width are: ； ； In the formula, is the second maximum protection height, is the second minimum protection width, is the second minimum protection radius, is the slope tangent value of the inclined plane, To protect the radius, is the rolling ball radius, h is the installation height of PLP, D is the distance between the first PLP and the second PLP; The horizontal protection range of the third zone protection range is the projection of the protection radius of the second PLP on the horizontal plane. The third zone protection range includes a third minimum protection radius and a third maximum protection height corresponding to the third minimum protection radius. The calculation expression of the third maximum protection height is: ； In the formula, is the third maximum protection height, is the third minimum protection radius, To protect the radius, is the rolling ball radius; The calculation expression of the protection radius is: ； Where r0 is the protection radius of PLP on the ground, h is the installation height of PLP, and h r is the rolling ball radius; The calculation expression of the slope tangent value is: ； In the formula, is the slope tangent value of the inclined plane, To protect the radius, is the rolling ball radius.

2. The method according to claim 1, characterized in that The value of the rolling ball radius is related to the lightning ground lightning density, terrain, region, and lightning protection level.

3. The method according to claim 1, characterized in that The protection range of the PLP on the horizontal plane is a concentric circle cluster, and the value of the protection radius of the PLP on the horizontal plane is associated with the protection height of the PLP on the vertical plane.

4. The method according to claim 1, characterized in that: After the step of determining the spacing between the first PLP and the second PLP, the method further includes: When the distance is greater than or equal to twice the protection radius, the protection range of the first PLP and the protection range of the second PLP are determined respectively based on a single PLP protection range calculation strategy.

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