A method for determining the PLP protection range of double-branch equal-height photovoltaic stations based on improved broken line 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 equal-height PLPs in a photovoltaic station based on an improved broken line method. By dividing the protection range of the two PLPs into inner and outer sides, the protection range of PLPs for photovoltaic equipment in different areas is different, making the protection more targeted; the protection method outside the two PLPs should be determined according to the protection range of a single PLP; the protection range between the two needles should be determined according to the height of the lowest point of the arc passing through the two PLP vertices and the lightning strike distance; on the outside of the arrester, by dividing different protection zones, a piecewise function can be used to determine the protection range outside the two PLPs. It aims to solve the problem of how to calculate the joint protection range of the two when the protection ranges between two 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 equal-height PLP protection range of a photovoltaic station based on an improved broken line 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; and the inventors found in the process of conceiving and realizing this application that: when the protection ranges between two equal-height PLPs in a photovoltaic station overlap, the use of traditional lightning protection range calculation methods will result in the problem that the actual lightning protection range of the PLP does not conform to the theoretical calculated value. For this reason, this application proposes a method for determining the protection range of two equal-height PLPs in a photovoltaic station to improve the calculation accuracy of the lightning protection range of the 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 equal-height PLPs in a photovoltaic station based on an improved broken line method, aiming to solve the problem of how to calculate the joint protection range of the two when the protection ranges between two 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 a photovoltaic station with two branches and equal heights based on an improved broken line method, the method comprising:

[0008] 1.5 times the installation height of the first PLP is used as the protection radius of a single PLP on the ground, and the distance between the first PLP and the second PLP is determined, wherein the first PLP and the second PLP are at the same height and in the same plane;

[0009] When the spacing is less than 7 times the PLP installation height, the minimum protection height of the midpoint of the line between the first PLP and the second PLP is calculated according to the protection radius and the spacing, and the inner protection height at any distance from the midpoint on the line between the first PLP and the second PLP is calculated according to the spacing;

[0010] And, obtaining the installation distance between the protected device and the PLP installation location, and calculating the outer protection height of the outer sides of the two PLPs according to the installation distance and the PLP installation height;

[0011] The protection range of the double-branch equal-height PLP formed by the first PLP and the second PLP in the photovoltaic station is determined according to the installation height, the protection radius, the spacing, the minimum protection height, the inner protection height and the outer protection height.

[0012] Optionally, the step of calculating the inner protection height at any distance from the midpoint on the line between the first PLP and the second PLP according to the spacing includes:

[0013] Calculate the radius of the lightning strike arc according to the spacing;

[0014] According to the arc radius of the lightning strike distance, an arc equation between two PLPs based on the improved curve method and an equation for the distance between the protected equipment and the PLP are constructed;

[0015] The arc equation and the distance equation between the protected device and the PLP are combined to obtain the inner protection height at any distance from the midpoint on the line between the first PLP and the second PLP.

[0016] Optionally, the calculation expression of the arc equation is:

[0017]

[0018] Wherein, (X, Y) is the coordinate of any point on the line between the first PLP and the second PLP, D is the distance between the first PLP and the second PLP, and h is the PLP installation height.

[0019] Optionally, the calculation expression of the distance equation between the protected device and the PLP is:

[0020]

[0021] Where D is the distance between the first PLP and the second PLP, and C is the distance between the protected device and the centers of the two PLPs.

[0022] Optionally, the calculation expression of the protection height at any distance X from the midpoint on the line between the first PLP and the second PLP is:

[0023]

[0024] In the formula, h x1 is the inner protection height, h is the PLP installation height, D is the distance between the first PLP and the second PLP, and C is the distance between the protected equipment and the center of the two PLPs.

[0025] Optionally, the calculation expression of the minimum protection height is:

[0026]

[0027] In the formula, is the minimum protection height, h is the PLP installation height, and D is the distance between the first PLP and the second PLP.

[0028] Optionally, when the installation distance between the protected device and the PLP installation location is greater than 0.5 times the PLP installation height, The calculation expression is:

[0029]

[0030] In the formula, is the PLP outer protection height when the installation distance is greater than 0.5 times the PLP installation height, h is the PLP installation height, It is the installation distance between the protected equipment and the PLP installation location.

[0031] Optionally, when the installation distance between the protected device and the PLP installation location is less than or equal to 0.5 times the PLP installation height, The calculation expression is:

[0032]

[0033] In the formula, is the PLP outer protection height when the installation distance is less than or equal to 0.5 times the PLP installation height, h is the PLP installation height, It is the installation distance between the protected equipment and the PLP installation location.

[0034] Optionally, after the steps of taking 1.5 times the installation height of the first PLP as the protection radius of a single PLP on the ground and determining the distance between the first PLP and the second PLP, the method further includes:

[0035] When the spacing is greater than or equal to 7 times the PLP installation height, the protection range of the first PLP is determined based on the single PLP protection range calculation strategy.

[0036] Optionally, the step of determining the protection range of a double-branch equal-height PLP jointly constituted by a first PLP and a second PLP in the photovoltaic station according to the installation height, the protection radius, the spacing, the minimum protection height, the inner protection height, and the outer protection height includes:

[0037] Calculate the inner protection range between the first PLP and the second PLP according to the spacing, the minimum protection height and the inner protection height;

[0038] Calculate the outer protection ranges of the first PLP and the second PLP respectively according to the installation height, the protection radius and the outer protection height;

[0039] The sum of the inner protection range, the outer protection range of the first PLP and the outer protection range of the second PLP is determined as the dual-branch equal-height PLP protection range.

[0040] This application has at least the following beneficial effects.

[0041] 1. By dividing the protection range of the two PLPs into inner and outer sides, the protection range of PLP for photovoltaic equipment in different areas is different, making the protection more targeted.

[0042] 2. The protection method outside the two PLPs should be determined according to the protection range of a single PLP; the protection range between the two needles should be determined according to the height of the lowest point of the arc passing through the vertices of the two PLPs and the lightning strike.

[0043] 3. By dividing the outside of the arrester into different protection areas, the protection range can be determined by a piecewise function outside the two PLPs. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a schematic diagram of the architecture of the hardware operating environment of the dual-branch equal-height PLP protection range calculation system involved in the embodiment of the present application;

[0045] Figure 2This is a flow chart of the first embodiment of the method for determining the double-branch equal-height PLP protection range of a photovoltaic station based on the improved broken line method of the present application;

[0046] Figure 3 This is a schematic diagram of the protection radius of a single PLP on the ground involved in an embodiment of the present application;

[0047] Figure 4 A schematic diagram of the inner side protection height involved in an embodiment of the present application;

[0048] Figure 5 This is a schematic diagram of the double-branch equal-height PLP protection range based on the improved curve method involved in an embodiment of the present application.

[0049] 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

[0050] 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.

[0051] As an implementation plan, Figure 1 This is a schematic diagram of the architecture of the hardware operating environment of the dual-branch equal-height PLP protection range calculation system involved in the embodiment of the present application.

[0052] like Figure 1 As shown, the dual-branch 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.

[0053] Those skilled in the art will understand that Figure 1The dual-branch equal-height PLP protection range calculation system architecture shown in the does not constitute a limitation on the dual-branch 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.

[0054] like Figure 1 As 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 equal-height PLP protection range determination program based on the improved broken line method. Among them, the operating system is a program for managing and controlling the hardware and software resources of the double-branch equal-height PLP protection range calculation system, the photovoltaic field station double-branch equal-height PLP protection range determination program based on the improved broken line method, and the operation of other software or programs.

[0055] exist Figure 1 In the double-branch 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 equal-height PLP protection range determination program based on the improved broken line method stored in the memory 1005.

[0056] In this embodiment, the double-branch equal-height PLP protection range calculation system includes: a memory 1005, a processor 1001, and a photovoltaic station double-branch equal-height PLP protection range determination program based on the improved broken line method stored in the memory and executable on the processor, wherein:

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

[0058] 1.5 times the installation height of the first PLP is used as the protection radius of a single PLP on the ground, and the distance between the first PLP and the second PLP is determined, wherein the first PLP and the second PLP are at the same height and in the same plane;

[0059] When the spacing is less than 7 times the PLP installation height, the minimum protection height of the midpoint of the line between the first PLP and the second PLP is calculated according to the protection radius and the spacing, and the inner protection height at any distance from the midpoint on the line between the first PLP and the second PLP is calculated according to the spacing;

[0060] And, obtaining the installation distance between the protected device and the PLP installation location, and calculating the outer protection height of the outer sides of the two PLPs according to the installation distance and the PLP installation height;

[0061] The protection range of the double-branch equal-height PLP formed by the first PLP and the second PLP in the photovoltaic station is determined according to the installation height, the protection radius, the spacing, the minimum protection height, the inner protection height and the outer protection height.

[0062] When the processor 1001 calls the photovoltaic station double-branch equal-height PLP protection range determination program based on the improved broken line method stored in the memory 1005, the following operations are performed:

[0063] When the spacing is greater than or equal to 7 times the PLP installation height, the protection range of the first PLP is determined based on the single PLP protection range calculation strategy.

[0064] When the processor 1001 calls the photovoltaic station double-branch equal-height PLP protection range determination program based on the improved broken line method stored in the memory 1005, the following operations are performed:

[0065] Calculate the inner protection range between the first PLP and the second PLP according to the spacing, the minimum protection height and the inner protection height;

[0066] Calculate the outer protection ranges of the first PLP and the second PLP respectively according to the installation height, the protection radius and the outer protection height;

[0067] The sum of the inner protection range, the outer protection range of the first PLP and the outer protection range of the second PLP is determined as the dual-branch equal-height PLP protection range.

[0068] Based on the hardware architecture of the double-branch 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 equal-height PLP protection range of a photovoltaic station based on the improved broken line method of the present application is proposed.

[0069] First embodiment

[0070] Reference Figure 2 In the first embodiment, the method for determining the double-branch equal-height PLP protection range of a photovoltaic station based on the improved broken line method includes the following steps:

[0071] Step S10, taking 1.5 times of the installation height of the first PLP as the protection radius of a single PLP on the ground, and determining the distance between the first PLP and the second PLP, wherein the first PLP and the second PLP are at the same height and in the same plane;

[0072] In this embodiment, 1.5 times of the installation height of the first PLP is used as the protection radius of a single PLP on the ground to determine the distance between the first PLP and the second PLP.

[0073] For example, refer to Figure 3 The schematic diagram of the protection radius of a single PLP on the ground is shown, and the protection radius of a single PLP on the ground is determined according to the improved broken line method.

[0074] The calculation expression of the protection radius r is:

[0075]

[0076] Determine the protection radius of a single PLP on the ground according to the improved broken line method

[0077] Where h is the installation height of PLP and r is the protection radius of PLP on the ground.

[0078] Optionally, 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.

[0079] Step S21, when the spacing is less than 7 times the PLP installation height, calculate the minimum protection height of the midpoint of the line between the first PLP and the second PLP according to the protection radius and the spacing, and calculate the inner protection height at any distance from the midpoint on the line between the first PLP and the second PLP according to the spacing;

[0080] Step S22, and, obtaining the installation distance between the protected device and the PLP installation location, and calculating the outer protection height of the outer sides of the two PLPs according to the installation distance and the PLP installation height;

[0081] In this embodiment, in step S21, when the distance between the first PLP and the second PLP is less than 7 times the PLP installation height, the protection range between the two PLPs is determined as the protection range of two equal-height PLPs. According to the protection radius and spacing obtained in the previous step, the minimum protection height h of the midpoint of the line between the first PLP and the second PLP is calculated. 0， And calculate the inner protection height h at any distance from the midpoint on the line between the first PLP and the second PLP according to the spacing x1 .

[0082] In addition, in this embodiment, when the spacing is greater than or equal to 7 times the PLP installation height, it means that the spacing between the PLPs is too large, and the protection range of the first PLP is determined based on the single PLP protection range calculation strategy.

[0083] The traditional single PLP protection range calculation strategy is an existing technology and will not be described in detail here.

[0084] Optionally, the calculation expression of the minimum protection height is:

[0085]

[0086] In the formula, is the minimum protection height, h is the PLP installation height, and D is the distance between the first PLP and the second PLP.

[0087] Optionally, the inner protection height h x1 The calculation steps include: calculating the arc radius of the lightning strike distance according to the spacing, constructing an arc equation between the two PLPs based on the improved curve method and a distance equation between the protected device and the PLP according to the arc radius of the lightning strike distance; combining the arc equation and the distance equation between the protected device and the PLP to obtain the inner protection height at any distance from the midpoint on the line between the first PLP and the second PLP.

[0088] For example, refer to Figure 4 Schematic diagram of the inner protection height is shown. Optionally, according to the regulations, the vertical distance from the lowest point of the lightning strike distance arc to the PLP vertex is taken as D / 7, and the calculation expression of the lightning strike distance arc is:

[0089]

[0090] Where R is the radius of the lightning stroke distance arc, and D / 7 is the vertical distance from the lowest point of the lightning stroke distance arc to the PLP vertex.

[0091] The radius R of the lightning strike distance arc is calculated to be 53D / 56, and the center of the lightning strike distance arc is determined to be (D / 2, (45D / 56)+h).

[0092] Further and optionally, the calculation expression of the arc equation is:

[0093]

[0094] Wherein, (X, Y) is the coordinate of any point on the line between the first PLP and the second PLP, D is the distance between the first PLP and the second PLP, and h is the PLP installation height.

[0095] Further and optionally, the calculation expression of the distance equation between the protected device and the PLP is:

[0096]

[0097] Where D is the distance between the first PLP and the second PLP, and C is the distance between the protected device and the centers of the two PLPs.

[0098] Further and optionally, the calculation expression of the protection height at any distance X from the midpoint on the line between the first PLP and the second PLP is:

[0099]

[0100] In the formula, h x1 is the inner protection height, h is the PLP installation height, D is the distance between the first PLP and the second PLP, and C is the distance between the protected equipment and the center of the two PLPs.

[0101] In this embodiment, in step S22, the installation distance C between the protected device and the PLP installation location is obtained, and the outer protection height h of the outer sides of the two PLPs is calculated according to the installation distance C and the PLP installation height h. x2 .

[0102] Optionally, the outer protection height h x2 There are two cases for the calculation of :

[0103] 1. When the installation distance between the protected equipment and the PLP installation location is greater than 0.5 times the PLP installation height, The calculation expression is:

[0104]

[0105] In the formula, is the PLP outer protection height when the installation distance is greater than 0.5 times the PLP installation height, h is the PLP installation height, It is the installation distance between the protected equipment and the PLP installation location.

[0106] 2. When the installation distance between the protected equipment and the PLP installation location is less than or equal to 0.5 times the PLP installation height, The calculation expression is:

[0107]

[0108] In the formula, is the PLP outer protection height when the installation distance is less than or equal to 0.5 times the PLP installation height, h is the PLP installation height, It is the installation distance between the protected equipment and the PLP installation location.

[0109] Step S30, determining the double-branch equal-height PLP protection range formed by the first PLP and the second PLP in the photovoltaic station according to the installation height, the protection radius, the spacing, the minimum protection height, the inner protection height and the outer protection height.

[0110] In this embodiment, after obtaining the parameters of installation height, protection radius, spacing, minimum protection height, inner protection height and outer protection height, the PLP installation height h, protection height h x (Including the inner protection height h x1 and outer protection height h x2 ), the distance D between the two PLPs is quantitatively analyzed and calculated. Finally, different protection zones are divided outside the arrester so that the distance from the PLP and the protection height can be determined by a piecewise function outside the two PLPs.

[0111] Optionally, the specific steps of calculating the dual-branch equal-height PLP protection range include:

[0112] According to the spacing, the minimum protection height and the inner protection height, the inner protection range between the first PLP and the second PLP is calculated. According to the installation height, the protection radius and the outer protection height, the outer protection range of the first PLP and the second PLP is calculated respectively, and the sum of the inner protection range, the outer protection range of the first PLP and the outer protection range of the second PLP is determined as the protection range of the double-branch equal-height PLP.

[0113] For example, refer to Figure 5 A schematic diagram of the protection range of a double-branch equi-height PLP based on the improved curve method is shown, wherein the area of ​​the triangular-like geometric figure on the left side of the first PLP is the outer protection range of the first PLP, the area of ​​the geometric figure between the first PLP and the second PLP is the inner protection range, and the area of ​​the triangular-like geometric figure on the right side of the second PLP is the outer protection range of the second PLP.

[0114] In the technical solution provided in this embodiment,

[0115] Second embodiment

[0116] Based on the first embodiment, in this embodiment, the minimum protection height h0=5m is taken at the midpoint of the line between the first PLP and the second PLP, and when the PLP installation height h=30m, the known parameters are substituted into the corresponding formula in the first embodiment, and the distance D=175m between the two lightning arresters can be obtained.

[0117] That is, when the height of the protected object is 5m, the distance between two 30m high PLPs cannot exceed 175m.

[0118] Third embodiment

[0119] Based on the first embodiment, in this embodiment, when the minimum protection height h0=0m at the midpoint of the line connecting the first PLP and the second PLP and the PLP installation height h=30m are taken, the known parameters are substituted into the corresponding formula in the first embodiment, and the distance between the two arresters D=210m can be obtained; that is, the prerequisite for the aforementioned two pins to have a joint protection range. The distance between the two PLPs cannot exceed 210m.

[0120] Fourth embodiment

[0121] Based on the first embodiment, in this embodiment, the PLP installation height h=30m, the distance between the protected equipment and the center of the two PLPs C=10m, and the distance between the two PLPs is 175m, the known parameters are substituted into the corresponding formula in the first embodiment to obtain the inner protection height h x1 =5.3m.

[0122] Fifth embodiment

[0123] Based on the first embodiment, in this embodiment, the PLP installation height h=30m, the distance between the protected equipment and the center of the two PLPs C=50m, and the distance between the two PLPs is 175m, the known parameters are substituted into the corresponding formula in the first embodiment to obtain the inner protection height h x1 =12.6m;

[0124] Sixth embodiment

[0125] Based on the first embodiment, in this embodiment, the PLP installation height h=30m, the distance between the protected equipment and the center of the two PLPs C=80m, and the distance between the two PLPs is 175m, the known parameters are substituted into the corresponding formula in the first embodiment to obtain the inner protection height h x1 =34.6m;

[0126] Seventh embodiment

[0127] Based on the first embodiment, in this embodiment, the PLP installation height h=30m, the distance between the protected equipment and the center of the two PLPs C=105m in an ideal state, and the distance between the two PLPs is 210m, the known parameters are substituted into the corresponding formula in the first embodiment to obtain the inner protection height h x1 ≈30m.

[0128] Eighth embodiment

[0129] Based on the first embodiment, in this embodiment, the PLP installation height h=30m, the distance between the protected equipment and the PLP installation location r x =20m, substituting the known parameters into the corresponding formula in the first embodiment, it can be obtained that when the installation distance is greater than 0.5 times the PLP installation height, =12.5m

[0130] Ninth embodiment

[0131] Based on the first embodiment, in this embodiment, the PLP installation height h=30m, the distance between the protected equipment and the PLP installation location r x =12m, substituting the known parameters into the corresponding formula in the first embodiment, it can be obtained that when the installation distance is less than or equal to 0.5 times the PLP installation height, =18m;

[0132] 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 equal-height PLP protection range calculation system to implement the process steps of the embodiment of the above method.

[0133] Therefore, the present application also provides a computer-readable storage medium, which stores a program for determining the double-branch equal-height PLP protection range of a photovoltaic station based on the improved broken line method. When the program for determining the double-branch equal-height PLP protection range of a photovoltaic station based on the improved broken line method is executed by a processor, it implements the various steps of the method for determining the double-branch equal-height PLP protection range of a photovoltaic station based on the improved broken line method as described in the above embodiment.

[0134] 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.

[0135] 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.

[0136] 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.

[0137] 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.

[0138] 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.

[0139] 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.

[0140] 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.

[0141] 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.

[0142] 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 PLP protection range of double-branch equal-height photovoltaic stations based on an improved broken line method, characterized in that: Applied to a photovoltaic station provided with at least two plasma lightning arresters of equal height, the method comprises the following steps: Taking 1.5 times of the installation height of the first plasma lightning arrester as the protection radius of a single plasma lightning arrester on the ground, and determining the distance between the first plasma lightning arrester and the second plasma lightning arrester, wherein the first plasma lightning arrester and the second plasma lightning arrester are of the same height and are in the same plane; When the spacing is less than 7 times the installation height of the plasma lightning arrester, the minimum protection height of the midpoint of the line between the first plasma lightning arrester and the second plasma lightning arrester is calculated according to the protection radius and the spacing, and the inner protection height at any distance from the midpoint on the line between the first plasma lightning arrester and the second plasma lightning arrester is calculated according to the spacing; And, obtaining the installation distance between the protected equipment and the installation location of the plasma lightning arrester, and calculating the outer protection height of the outer sides of the two plasma lightning arresters according to the installation distance and the installation height of the plasma lightning arrester; Determine the protection range of the double-branch equal-height plasma lightning arrester formed by the first plasma lightning arrester and the second plasma lightning arrester in the photovoltaic station according to the installation height, the protection radius, the spacing, the minimum protection height, the inner protection height and the outer protection height; The step of calculating the inner protection height at any distance from the midpoint on the line between the first plasma lightning arrester and the second plasma lightning arrester according to the spacing comprises: Calculate the radius of the lightning strike arc according to the spacing; According to the arc radius of the lightning strike distance, an arc equation between two plasma lightning arresters based on the improved curve method and an equation for the distance between the protected equipment and the plasma lightning arrester are constructed; Combine the arc equation and the distance equation between the protected device and the plasma lightning arrester to obtain the inner protection height at any distance from the midpoint on the line between the first plasma lightning arrester and the second plasma lightning arrester; The calculation expression of the arc equation is: ； Wherein, (X, Y) is the coordinate of any point on the line between the first plasma lightning arrester and the second plasma lightning arrester, D is the distance between the first plasma lightning arrester and the second plasma lightning arrester, and h is the installation height of the plasma lightning arrester; The calculation expression of the distance equation between the protected equipment and the plasma lightning arrester is: ； In the formula, D is the distance between the first plasma lightning arrester and the second plasma lightning arrester, and C is the distance between the protected equipment and the center of the two plasma lightning arresters; The calculation expression of the protection height at any distance X from the midpoint on the connecting line between the first plasma lightning arrester and the second plasma lightning arrester is: ； In the formula, h x1 is the inner protection height, h is the installation height of the plasma lightning arrester, D is the distance between the first plasma lightning arrester and the second plasma lightning arrester, and C is the distance between the protected equipment and the center of the two plasma lightning arresters; When the installation distance between the protected equipment and the installation location of the plasma lightning arrester is greater than 0.5 times the installation height of the plasma lightning arrester, The calculation expression is: ； In the formula, is the outer protection height of the plasma lightning arrester when the installation distance is greater than 0.5 times the installation height of the plasma lightning arrester, h is the installation height of the plasma lightning arrester, It is the installation distance between the protected equipment and the installation location of the plasma lightning arrester.

2. The method according to claim 1, characterized in that The calculation expression of the minimum protection height is: ； In the formula, is the minimum protection height, h is the installation height of the plasma lightning arrester, and D is the distance between the first plasma lightning arrester and the second plasma lightning arrester.

3. The method according to claim 1, characterized in that When the installation distance between the protected equipment and the installation location of the plasma lightning arrester is less than or equal to 0.5 times the installation height of the plasma lightning arrester, The calculation expression is: ； In the formula, is the outer protection height of the plasma lightning arrester when the installation distance is less than or equal to 0.5 times the installation height of the plasma lightning arrester, h is the installation height of the plasma lightning arrester, It is the installation distance between the protected equipment and the installation location of the plasma lightning arrester.

4. The method according to claim 1, characterized in that: After the steps of taking 1.5 times the installation height of the first plasma lightning arrester as the protection radius of a single plasma lightning arrester on the ground and determining the distance between the first plasma lightning arrester and the second plasma lightning arrester, the method further includes: When the spacing is greater than or equal to 7 times the installation height of the plasma lightning arrester, the protection range of the first plasma lightning arrester is determined based on the protection range calculation strategy of a single plasma lightning arrester.

5. The method according to claim 1, characterized in that: The step of determining the protection range of the double-branch equal-height plasma lightning arrester formed by the first plasma lightning arrester and the second plasma lightning arrester in the photovoltaic station according to the installation height, the protection radius, the spacing, the minimum protection height, the inner protection height and the outer protection height comprises: Calculate the inner protection range between the first plasma lightning arrester and the second plasma lightning arrester according to the spacing, the minimum protection height and the inner protection height; According to the installation height, the protection radius and the outer protection height, respectively calculating the outer protection ranges of the first plasma lightning arrester and the second plasma lightning arrester; The sum of the inner protection range, the outer protection range of the first plasma lightning arrester and the outer protection range of the second plasma lightning arrester is determined as the protection range of the double-branch equal-height plasma lightning arrester.

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