Offshore photovoltaic grounding method

Abstract

The invention belongs to the field of offshore photovoltaic technology, and discloses an offshore photovoltaic grounding method, which comprises a photovoltaic structure and a grounding structure. The photovoltaic structure comprises a photovoltaic support, a fixing pile and a plurality of photovoltaic module frames. The photovoltaic support is fixed on the fixing pile. The grounding structure comprises a grounding body, a leading-up conductor and a plurality of electric conductors, each electric conductor is laid along the photovoltaic support and fixed to the photovoltaic support through a corresponding fastener, and every two adjacent electric conductors are fixedly connected through a clamping piece; the leading-up conductor is connected between the photovoltaic module frame and the electric conductor; one end of the grounding body is connected to the conductor, and the other end of the grounding body is buried in a seabed mud surface so as to realize grounding connection. A horizontal buried net does not need to be erected, on-site welding operation is not needed, construction is convenient, the construction difficulty can be effectively lowered, and the construction efficiency is improved. In addition, according to the method, a plurality of conductors are combined with the grounding body to be led into the seabed mud surface, the requirement that the grounding resistance is smaller than 4 ohms is met, and the safety of offshore photovoltaic grounding is ensured.

Description

Technical Field

[0001] The invention relates to the technical field of offshore photovoltaics, and in particular to an offshore photovoltaic grounding method. Background Art

[0002] Offshore photovoltaics have attracted much attention as a new energy form with great development potential. Compared with onshore photovoltaics, offshore photovoltaics have natural environmental advantages. The sea surface is open and there are no obstructions. The sunshine is long and fully utilized, which can significantly increase the power generation. In order to ensure that photovoltaic modules are not damaged by lightning and to ensure the normal and stable operation of the photovoltaic system, lightning protection grounding is required.

[0003] In the existing technology, when traditional onshore photovoltaic power generation is used for lightning protection and grounding, a horizontal grounding grid needs to be built around the photovoltaic field. The buried depth of the horizontal grounding grid should not be less than 0.8m, and the underwater horizontal buried grid has high requirements for corrosion protection. However, in offshore photovoltaic projects with piles, due to the deep water surface and the high altitude of photovoltaic modules, it is difficult to build a horizontal grounding grid and bury it underwater, and there are corrosion protection issues. Summary of the invention

[0004] The purpose of the present invention is to provide an offshore photovoltaic grounding method, which is convenient to construct and can meet the anti-corrosion requirements.

[0005] To achieve this object, the present invention adopts the following technical solutions:

[0006] Provided is an offshore photovoltaic grounding method, including a photovoltaic structure and a grounding structure;

[0007] The photovoltaic structure comprises a photovoltaic support, a fixing pile and a plurality of photovoltaic component frames, the photovoltaic support is fixed on the fixing pile, each photovoltaic component frame is fixed on the photovoltaic support, and the photovoltaic component frame is configured to fix the photovoltaic panel;

[0008] The grounding structure includes a grounding body, a lead-up conductor and multiple conductors. Each of the conductors is laid along the photovoltaic bracket and fixed to the photovoltaic bracket by corresponding fasteners. Two adjacent conductors are fixedly connected by a clamping piece; the lead-up conductor is connected between the photovoltaic component frame and the conductor; one end of the grounding body is connected to one of the conductors, and the other end is buried in the seabed mud.

[0009] As an optional solution for the offshore photovoltaic grounding method, the grounding body, the conductor and the lead-up conductor are all aluminum-copper alloy rods.

[0010] As an optional solution for offshore photovoltaic grounding methods, an alloy crimping nose is provided on the frame of the photovoltaic component, and an insertion cavity is provided at the end of the alloy crimping nose away from the photovoltaic bracket. The lead-up conductor is inserted into the insertion cavity, and a crimping piece is pressed at the junction of the alloy crimping nose and the lead-up conductor.

[0011] As an optional solution for the offshore photovoltaic grounding method, the diameter of the lead-in conductor is D, and the crimping length of the crimping piece is not less than 6D.

[0012] As an optional solution for the offshore photovoltaic grounding method, the grounding body is attached to the outer wall of the fixing pile and is tied to the fixing pile by a fixing piece.

[0013] As an optional solution for offshore photovoltaic grounding methods, the grounding body is coated with anti-corrosion paint, which includes a base coating, an intermediate coating and a surface coating. The base coating is an epoxy zinc-rich primer, the intermediate coating is an epoxy micaceous iron intermediate coating, and the surface coating is an aliphatic acrylic polyurethane topcoat.

[0014] As an optional solution for offshore photovoltaic grounding method, a water-stopping protection tube is provided on the grounding body, and cement is sealed in the water-stopping protection tube.

[0015] As an optional solution for offshore photovoltaic grounding method, both ends of the water-stopping protection pipe are coated with a waterproof protective layer.

[0016] As an optional solution for the offshore photovoltaic grounding method, the fastener is a clamp.

[0017] As an optional solution for offshore photovoltaic grounding method, the clamping piece is a C-type crimping clamp.

[0018] Beneficial effects of the present invention:

[0019] The present invention provides an offshore photovoltaic grounding method, wherein the grounding structure includes a grounding body, a lead-in conductor and a plurality of conductors, each conductor is laid along the photovoltaic support, and is fixed to the photovoltaic support by corresponding fasteners, and two adjacent conductors are fixedly connected by a clamp; the lead-in conductor is connected between the photovoltaic component frame and the conductor; one end of the grounding body is connected to one of the conductors, and the other end is buried in the seabed mud surface to achieve a grounding connection. There is no need to set up a horizontal buried network, and no on-site welding operations are required. The construction is convenient, and the construction difficulty can be effectively reduced and the construction efficiency can be improved. In addition, the method uses a combination of multiple conductors and grounding bodies to lead them down to the seabed mud surface, which is conducive to reducing the resistance of the grounding network, meeting the requirement that the grounding resistance is less than 4 ohms, and ensuring the safety of offshore photovoltaic grounding. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1It is a schematic diagram of the structure of a photovoltaic bracket provided in a specific embodiment of the present invention;

[0021] Figure 2 is a cross-sectional view of a photovoltaic structure and a grounding structure provided by a specific embodiment of the present invention;

[0022] Figure 3 It is a detailed diagram of the connection between the lead-up conductor and the photovoltaic module frame provided in the specific implementation example of the present invention;

[0023] Figure 4 It is a detailed diagram of the connection between the conductor and the lead-up conductor provided in the specific implementation example of the present invention.

[0024] In the figure:

[0025] 100, mud surface line; 200, sea surface line;

[0026] 1. Photovoltaic structure; 11. Photovoltaic bracket; 12. Fixing pile; 13. Photovoltaic module frame; 130. Mounting hole; 131. Bolt; 132. Nut;

[0027] 2. Grounding structure; 21. Grounding body; 22. Conductor; 23. Lead-up conductor;

[0028] 3. Fasteners; 4. Clip-on parts; 5. Alloy crimping noses; 6. Crimping parts; 7. Fixing parts; 8. Water-stop protection tube. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0030] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0031] In the present invention, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0032] In the description of this embodiment, the terms "upper", "lower", "right" and other directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplified operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0033] The technical solution of the present invention is further described below with reference to the accompanying drawings and through specific implementation methods.

[0034] This embodiment provides an offshore photovoltaic grounding method, such as Figures 1 to 4 As shown, it includes a photovoltaic structure 1 and a grounding structure 2. Among them, the photovoltaic structure 1 includes a photovoltaic support 11, a fixed pile 12 and a plurality of photovoltaic component frames 13, the photovoltaic support 11 is fixed on the fixed pile 12, the fixed pile 12 is fixed on the mud surface line 100 on the seabed, each photovoltaic component frame 13 is fixed on the photovoltaic support 11, and the photovoltaic component frame 13 is configured to fix the photovoltaic panel; the grounding structure 2 includes a grounding body 21, a lead-up conductor 23 and a plurality of conductors 22, each conductor 22 is laid along the photovoltaic support 11, and is fixed on the photovoltaic support 11 by a corresponding fastener 3, and two adjacent conductors 22 are fixedly connected by a clamp 4; the lead-up conductor 23 is connected between the photovoltaic component frame 13 and the conductor 22; one end of the grounding body 21 is connected to one of the conductors 22, and the other end is buried in the mud surface of the seabed to achieve grounding connection. There is no need to set up a horizontal buried network, and there is no need for on-site welding operations. The construction is convenient, which can effectively reduce the construction difficulty and improve the construction efficiency. In addition, the method uses a combination of multiple conductors 22 and grounding bodies 21 to lead them down to the seabed mud surface, which is beneficial to reducing the resistance of the grounding grid, meeting the requirement that the grounding resistance is less than 4 ohms, and ensuring the safety of offshore photovoltaic grounding.

[0035] Optionally, the grounding body 21, the conductor 22 and the lead-in conductor 23 are all aluminum-copper alloy rods. The corrosion rate of the copper-aluminum alloy rods is 0.05 mm / a, which has high corrosion resistance and meets the anti-corrosion requirements of offshore photovoltaic grounding.

[0036] Optionally, in this embodiment, the fastener 3 is a clamp commonly used in the art, which is simple and convenient to operate, easy to obtain materials, and has good economy.

[0037] Optionally, the clamping member 4 is a C-type crimping clamp. The C-type crimping clamp is used to crimp and fix two adjacent conductors 22, which is simple and convenient to operate. Specifically, the crimping length of the C-type crimping clamp is not less than six times the diameter of the conductor 22.

[0038] Optionally, refer to Figure 3 The photovoltaic module frame 13 is provided with an alloy crimping nose 5, and an inserting cavity is provided at one end of the alloy crimping nose 5 away from the photovoltaic bracket 11, and the lead-up conductor 23 is inserted into the inserting cavity, and a crimping piece 6 is pressed at the junction of the alloy crimping nose 5 and the lead-up conductor 23 to ensure the stability of the lead-up conductor 23 inserted into the inserting cavity. Specifically, the alloy crimping nose 5 is also an existing structure commonly used in the art. Exemplarily, the crimping piece 6 is a crimping clamp commonly used in the art.

[0039] Specifically, continue to refer to Figure 3 A mounting hole 130 is opened on the photovoltaic module frame 13, a bolt 131 is passed through the mounting hole 130, an alloy wire pressing nose 5 is sleeved on the bolt 131, two nuts 132 are sleeved on the bolt 131, and the two nuts 132 are respectively arranged on both sides of the alloy wire pressing nose 5 to fix the alloy wire pressing nose 5 on the photovoltaic module frame 13. The operation is simple and convenient, the materials are easy to obtain, and it has good economy.

[0040] Furthermore, the diameter of the upper conductor 23 is D, and the crimping length of the crimping piece 6 is not less than 6D, so as to ensure the connection stability between the upper conductor 23 and the alloy crimping nose 5 .

[0041] Optionally, refer to Figure 4 The end of the lead-up conductor 23 away from the plug-in cavity is fixed to the corresponding conductor 22 through the clamping member 4 to achieve the connection between the lead-up conductor 23 and the conductor 22. Specifically, the clamping member 4 is a C-type crimping clamp, and the crimping length of the C-type crimping clamp is not less than six times the diameter of the conductor 22.

[0042] Specifically, Figure 4 The illustrated clamping member 4 can also be used for fixed connection between two adjacent conductors 22, and can also be used for fixed connection between a conductor 22 and a grounding body 21. The installation is simple and convenient, which is conducive to improving construction efficiency.

[0043] Optionally, the grounding body 21 is attached to the outer wall of the fixing pile 12 and is tied to the fixing pile 12 by the fixing member 7 to further improve the stability of the grounding body 21 and prevent it from moving with the drift of the seawater in the seawater. Specifically, the grounding body 21 is also an aluminum-copper alloy rod, and the fixing member 7 is a stainless steel wire commonly used in the field, which is not easy to corrode and rust. Exemplarily, multiple fixing members 7 can be arranged vertically to ensure the stability of the grounding body 21. The specific number of fixing members 7 can be set as needed and is not specifically limited here.

[0044] Optionally, the grounding body 21 is coated with an anti-corrosion paint, which includes a base coating, an intermediate coating and a surface coating, wherein the base coating is an epoxy zinc-rich primer, the intermediate coating is an epoxy micaceous iron intermediate coating, and the surface coating is an aliphatic acrylic polyurethane topcoat. The above configuration is used to improve the anti-corrosion performance of the grounding body 21 and extend the service life of the grounding body 21. Specifically, in this embodiment, the anti-corrosion paint is coated at the junction of the grounding body 21 and the sea surface line 200; in other embodiments, the entire outer wall of the grounding body 21 can be coated with the anti-corrosion paint.

[0045] Specifically, in this embodiment, the epoxy zinc-rich primer of the bottom layer is coated with two layers, and the dry film thickness of the bottom layer is 80 μm, the epoxy micaceous iron intermediate paint of the middle layer is coated with two layers, and the dry film thickness of the middle layer is 200 μm, and the aliphatic acrylic polyurethane of the surface layer is coated with three layers, and the dry film thickness of the surface layer is 100 μm, and the overall dry film thickness of the anti-corrosion paint is 380 μm. In other embodiments, the number of layers of the bottom layer paint, the middle layer paint, and the surface layer paint can be set as needed, and is not specifically limited here.

[0046] Optionally, refer to Figure 2 , a water stop protection pipe 8 is provided on the grounding body 21, and cement is filled in the water stop protection pipe 8 to improve the anti-corrosion performance of the grounding body 21 and prevent the grounding body 21 from rusting and corroding due to long-term contact with seawater. Specifically, in this embodiment, the upper end of the water stop pipe is located 1000m above the sea level 200, and the lower end of the water stop pipe is located 1000m below the sea level 200; in other embodiments, the positions of the upper and lower ends of the water stop pipe relative to the sea level 200 can be determined according to the high tide and low tide water levels, and are not specifically limited here.

[0047] Furthermore, both ends of the water-stopping protection tube 8 are coated with a waterproof protective layer to further improve the anti-corrosion performance of the grounding body 21. Specifically, the waterproof protective layer is a waterproof glue disclosed in the prior art.

[0048] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. An offshore photovoltaic grounding method, characterized in that: It comprises a photovoltaic structure (1) and a grounding structure (2); The photovoltaic structure (1) comprises a photovoltaic support (11), a fixing pile (12) and a plurality of photovoltaic component frames (13); the photovoltaic support (11) is fixed on the fixing pile (12); each photovoltaic component frame (13) is fixed on the photovoltaic support (11); and the photovoltaic component frame (13) is configured to fix a photovoltaic panel; The grounding structure (2) comprises a grounding body (21), a lead-up conductor (23) and a plurality of conductors (22); each conductor (22) is laid along the photovoltaic support (11) and is fixed to the photovoltaic support (11) via a corresponding fastener (3); two adjacent conductors (22) are fixedly connected via a clamp (4); the lead-up conductor (23) is connected between the photovoltaic component frame (13) and the conductor (22); one end of the grounding body (21) is connected to one of the conductors (22), and the other end is buried in the seabed mud surface.

2. The offshore photovoltaic grounding method according to claim 1, characterized in that: The grounding body (21), the conductor (22) and the upper conductor (23) are all aluminum-copper alloy rods.

3. The offshore photovoltaic grounding method according to claim 1, characterized in that: An alloy wire crimping nose (5) is sleeved on the photovoltaic component frame (13), an end of the alloy wire crimping nose (5) away from the photovoltaic bracket (11) is provided with an insertion cavity, the lead-up conductor (23) is inserted into the insertion cavity, and a crimping piece (6) is pressed at the junction of the alloy wire crimping nose (5) and the lead-up conductor (23).

4. The offshore photovoltaic grounding method according to claim 3, characterized in that: The diameter of the lead-up conductor (23) is D, and the crimping length of the crimping piece (6) is not less than 6D.

5. The offshore photovoltaic grounding method according to claim 1, characterized in that: The grounding body (21) is attached to the outer wall of the fixing pile (12) and is tied to the fixing pile (12) via a fixing member (7).

6. The offshore photovoltaic grounding method according to claim 1, characterized in that: The grounding body (21) is coated with an anti-corrosion paint, which includes a base coating, an intermediate coating and a surface coating. The base coating is an epoxy zinc-rich primer, the intermediate coating is an epoxy micaceous iron intermediate coating, and the surface coating is an aliphatic acrylic polyurethane topcoat.

7. The offshore photovoltaic grounding method according to claim 1, characterized in that: The grounding body (21) is sleeved with a water-stopping protection pipe (8), and the water-stopping protection pipe (8) is sealed with cement.

8. The offshore photovoltaic grounding method according to claim 7, characterized in that: Both ends of the water-stopping protection pipe (8) are coated with a waterproof protective layer.

9. The offshore photovoltaic grounding method according to any one of claims 1 to 8, characterized in that: The fastener (3) is a clamp.

10. The offshore photovoltaic grounding method according to any one of claims 1 to 8, characterized in that: The clamping piece (4) is a C-shaped crimping clamp.

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