Offshore photovoltaic cluster submarine cable laying method

Abstract

The invention provides an offshore photovoltaic cluster submarine cable laying method, and relates to the field of offshore photovoltaic technologies. The laying method comprises the following steps: transporting a submarine cable reel to a preset position on the sea surface; pulling one end of the submarine cable in the submarine cable reel from a preset position to a land area, and connecting the submarine cable with a sea-land conversion docking box on the land area; the submarine cable in the submarine cable reel is put down according to a preset route until the submarine cable extends to the offshore photovoltaic platform from the land area; excavating a seabed mud layer along the extension direction of the submarine cable to form a submarine cable laying groove, placing the submarine cable in the submarine cable laying groove, and backfilling the submarine cable laying groove; and fixing the submarine cable extending to the offshore photovoltaic platform on the offshore photovoltaic platform. According to the submarine cable laying method, the submarine cable laying efficiency and stability can be improved.

Description

Technical Field

[0001] The present disclosure relates to the field of offshore photovoltaic technology, and in particular to a method for laying offshore photovoltaic cluster submarine cables. Background Art

[0002] In the field of offshore power generation, wind power generation has long dominated, but with the in-depth exploration and growing demand for the use of renewable energy around the world, offshore photovoltaics as an emerging and highly promising power generation method is gradually entering people's field of vision. Photovoltaic panels on offshore photovoltaic platforms need to be connected to the power system on land through submarine cables. However, due to the complex environment at sea, the laying efficiency of submarine cables is low and the stability is poor.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] The present invention provides a method for laying an offshore photovoltaic cluster submarine cable, which can improve the efficiency and stability of submarine cable laying.

[0005] According to one aspect of the present disclosure, a method for laying an offshore photovoltaic cluster cable is provided, comprising: Transporting the submarine cable reel to a preset location on the sea surface; Pulling one end of the submarine cable in the submarine cable reel from the preset position to the land area, and connecting it to the sea-land conversion docking box on the land area; Lowering the submarine cable in the submarine cable reel according to a predetermined route until the submarine cable extends from the land area to the offshore photovoltaic platform; Excavating a seabed mud layer along the extension direction of the submarine cable to form a submarine cable laying groove, placing the submarine cable in the submarine cable laying groove, and backfilling the submarine cable laying groove; The submarine cable extending to the offshore photovoltaic platform is fixed on the offshore photovoltaic platform.

[0006] In an exemplary embodiment of the present disclosure, pulling one end of the submarine cable in the submarine cable reel from the preset position to the land area and connecting it to the sea-land conversion docking box on the land area includes: Building a land towing platform, wherein a towing winch is provided on the land towing platform; a sea-land conversion docking box is provided on the side of the land towing platform away from the sea surface; Connecting one end of the submarine cable in the submarine cable reel to a traction rigging, and traction the end of the traction rigging away from the submarine cable to the land traction platform; The traction winch is used to tow the traction rigging to lower the submarine cable in the submarine cable reel, and the traction rigging drives the end of the submarine cable to move to the land traction platform; The end of the submarine cable located on the land towing platform is connected to the sea-land conversion docking box.

[0007] In an exemplary embodiment of the present disclosure, a submarine cable laying plough is used to form the submarine cable laying groove, and the depth and width of the submarine cable laying groove are both greater than the diameter of the submarine cable.

[0008] In an exemplary embodiment of the present disclosure, the submarine cable laying plow includes a plow body, a submarine cable limiting groove and a cable pressing device, the submarine cable limiting groove is located on the side of the plow body away from the seabed, the submarine cable limiting groove is used to lift the submarine cable, and the plow body can excavate the seabed mud layer and form the submarine cable laying groove during the forward movement; and the submarine cable located behind the plow body can be placed in the submarine cable laying groove; the cable pressing device can backfill the soil around the submarine cable laying groove.

[0009] In an exemplary embodiment of the present disclosure, the offshore photovoltaic platform comprises a support rod and a support platform, the support rod is fixed in a direction perpendicular to the sea surface, and the support platform is arranged on the support rod and is located above the sea surface; The step of fixing the submarine cable extending to the offshore photovoltaic platform on the offshore photovoltaic platform comprises: After the submarine cable is extended to the supporting platform, cutting the submarine cable to separate the submarine cable from the submarine cable reel; A submarine cable fixing piece is arranged on the support rod, wherein the submarine cable fixing piece is provided with a through hole, the submarine cable passes through the through hole and extends to the support platform; A fixing clamp is arranged on the submarine cable, and the fixing clamp is located on a side of the submarine cable fixing piece away from the seabed, and one end of the fixing clamp penetrates into the through hole and is interference fit with the inner wall of the through hole.

[0010] In an exemplary embodiment of the present disclosure, the submarine cable laying method further includes: A bending limiter is arranged at the bottom of the supporting rod, and the submarine cable passes through the bending limiter.

[0011] In an exemplary embodiment of the present disclosure, the bending limiter is an arc-shaped tube.

[0012] In an exemplary embodiment of the present disclosure, the submarine cable laying method further includes: Installing a traction net in the end of the submarine cable close to the supporting platform; A guide pulley and a traction rope are installed on the support platform. The traction rope passes around the guide pulley and is connected to the traction net. The traction rope can drive the fixing fixture and the submarine cable to pass through the bending limiter.

[0013] In an exemplary embodiment of the present disclosure, the submarine cable laying method further includes: Conducting electrical performance tests on the submarine cable.

[0014] In an exemplary embodiment of the present disclosure, the submarine cable laying method further includes: The submarine cable is connected to the photovoltaic panels on the offshore photovoltaic platform.

[0015] The method for laying offshore photovoltaic clustered submarine cables disclosed in the present invention simplifies the operation process by directly unfolding the submarine cable reel at a preset position on the sea surface, and pulling the submarine cable to the land area to connect with the sea-land conversion docking box, reducing multiple intermediate links in traditional laying (such as temporary storage, segmented docking, etc.), shortening the laying cycle, and improving the efficiency of submarine cable laying. At the same time, by excavating a laying groove on the seabed and placing the submarine cable therein, and then backfilling the soil, the potential threats to the submarine cable from the complex seabed environment (such as water flow impact, sediment movement, and interference from marine organisms) are effectively avoided, thereby ensuring the long-term stable operation of the submarine cable and improving the stability of the submarine cable. In addition, fixing the submarine cable on the offshore photovoltaic platform not only facilitates the connection between the submarine cable and the photovoltaic panel on the offshore photovoltaic platform, but also reduces the movement and wear of the submarine cable caused by natural environmental factors, which can reduce maintenance costs and extend the service life of the submarine cable.

[0016] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0018] Figure 1 It is a flow chart of the method for laying offshore photovoltaic cluster submarine cables in an embodiment of the present disclosure.

[0019] Figure 2 It is a schematic diagram of dragging and pulling rigging at a preset position in an embodiment of the present disclosure.

[0020] Figure 3 It is a schematic diagram of the state of the traction rigging towing the submarine cable in the embodiment of the present disclosure.

[0021] Figure 4 It is a schematic diagram of the end of the submarine cable being dragged to the land area in an embodiment of the present disclosure.

[0022] Figure 5 It is a schematic diagram of a submarine cable transport ship reaching an offshore photovoltaic platform in an embodiment of the present disclosure.

[0023] Figure 6 It is a schematic diagram of a submarine cable laying plow in an embodiment of the present disclosure.

[0024] Figure 7 It is a schematic diagram of fixing a submarine cable on a support pole in an embodiment of the present disclosure.

[0025] In the figure: 1. Submarine cable reel; 11. Submarine cable; 2. Land area; 21. Land towing platform; 22. Sea-land conversion docking box; 23. Cable trench; 3. Offshore photovoltaic platform; 31. Support rod; 32. Support platform; 4. Towing rigging; 5. Submarine cable laying plow; 6. Seabed mud layer; 7. Submarine cable fixings; 8. Fixing clamps; 9. Bending limiter; 10. Towing net; 20. Guide pulley; 30. Towing rope; 40. Submarine cable transport ship; 50. Cable-laying ship; 60. Anchor cable. DETAILED DESCRIPTION

[0026] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that this disclosure will be comprehensive and complete and will fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted.

[0027] Although relative terms such as "upper" and "lower" are used in this specification to describe the relative relationship of one component of the illustration to another component, these terms are used in this specification only for convenience, such as according to the orientation of the examples described in the drawings. It is understood that if the device of the illustration is turned upside down, the component described as "upper" will become the component "lower". When a structure is "on" other structures, it may mean that the structure is formed integrally on the other structure, or that the structure is "directly" disposed on the other structure, or that the structure is "indirectly" disposed on the other structure through another structure.

[0028] The terms "a", "an", "the" and "said" are used to indicate the presence of one or more elements / components / etc.; the terms "comprising" and "having" are used to indicate an open-ended inclusive meaning and mean that additional elements / components / etc. may be present in addition to the listed elements / components / etc.

[0029] In the current technical field, offshore power generation projects are mainly concentrated in the field of wind power, and there are relatively few offshore photovoltaic projects. Although wind power projects also involve the laying of submarine cables, their specific needs and construction requirements are completely different from those of offshore photovoltaic projects. Offshore photovoltaic projects not only require the seamless connection between submarine cables and photovoltaic panels on offshore photovoltaic platforms, but also face the actual situation of a large number of submarine cables and significantly increased laying difficulty. Therefore, how to lay submarine cables efficiently and reliably has become a difficult point in the construction of offshore photovoltaic projects.

[0030] Based on this, the embodiment of the present disclosure provides a method for laying an offshore photovoltaic cluster cable. Figure 1 As shown, the laying method may include steps S110 to S150, wherein: Step S110, transporting the submarine cable reel to a preset position on the sea surface; Step S120, pulling one end of the submarine cable in the submarine cable reel from the preset position to the land area, and connecting it to the sea-land conversion docking box on the land area; Step S130, lowering the submarine cable in the submarine cable reel according to a predetermined route until the submarine cable extends from the land area to the offshore photovoltaic platform; Step S140, excavating a seabed mud layer along the extension direction of the submarine cable to form a submarine cable laying groove, placing the submarine cable in the submarine cable laying groove, and backfilling the submarine cable laying groove; Step S150, fixing the submarine cable extending to the offshore photovoltaic platform on the offshore photovoltaic platform.

[0031] In some embodiments of the present disclosure, the submarine cable laying method of the present disclosure may further include: setting a bending limiter at the bottom of the offshore photovoltaic platform, and the submarine cable passes through the bending limiter.

[0032] The disclosed offshore photovoltaic cluster cable laying method directly unfolds the cable reel at a preset position on the sea surface, and pulls the cable to the land area to achieve seamless connection with the sea-land conversion docking box, eliminating multiple intermediate links such as temporary storage and segmented docking in traditional laying, greatly shortening the laying cycle and improving overall operation efficiency. During the submarine laying stage, this method provides a solid protective barrier for the submarine cable by excavating a laying trench and safely placing the submarine cable therein, and then backfilling the soil, which enables the submarine cable to effectively resist the potential threats to the submarine cable from the complex submarine environment (such as water flow impact, sediment movement, and marine biological activities, etc.), thereby improving the stability and reliability of the submarine cable. In addition, by setting a bend limiter on the seabed, the submarine cable can be prevented from forming sharp bends or corners on the seabed, reducing the risk of damage to the submarine cable due to excessive bending, and helping to improve the service life and reliability of the submarine cable.

[0033] The following is a detailed description of the various steps and specific details of the method for laying offshore photovoltaic bundled submarine cables disclosed in the present invention: like Figure 1 As shown, in step S110, the submarine cable reel is transported to a preset position on the sea surface.

[0034] like Figure 2 and Figure 3 As shown, the submarine cable reel 1 can be used as a device for storing and transporting the submarine cable 11. It is usually cylindrical and can safely and orderly wind and fix the submarine cable 11 to prevent it from being damaged during transportation and laying. The submarine cable reel 1 is designed with a sturdy shell and internal support structure to ensure that the submarine cable 11 maintains a stable shape when winding and releasing; at the same time, the two ends of the submarine cable reel 1 are usually equipped with locking mechanisms, which can be used to fix the submarine cable 11 during transportation and storage.

[0035] The seabed area corresponding to the preset position is a geologically stable seabed area, and is avoided in areas with frequent geological activities such as landslides, mudslides, faults, etc., so as to reduce the potential threat of seabed geological changes to the submarine cable 11. Before transporting the submarine cable reel 1, the sea surface can be surveyed to ensure that the seabed terrain, water depth, water flow and other conditions corresponding to the preset position meet the requirements for transportation and laying of the submarine cable 11, and the specific coordinates of the preset position are marked, and obvious markers or buoys can be set for accurate identification at sea.

[0036] At the same time, the determination of the preset position should also take into account the operating capacity of the submarine cable transport ship 40 and the design requirements of the submarine cable 11, and select an appropriate water depth as the preset position. The preset position should be located in a sea area with relatively gentle currents to reduce the impact of the currents on the laying process of the submarine cable 11 and reduce the risk of damage to the submarine cable 11 due to the impact of the currents. The submarine cable reel 1 can be transported to the preset position by the submarine cable transport ship 40.

[0037] In some embodiments of the present disclosure, the straight-line distance between the preset position and the land area 2 may be greater than 200 meters. For example, the straight-line distance between the preset position and the land area 2 may be 200 meters, 300 meters, 400 meters, 500 meters or 600 meters. Of course, the straight-line distance between the preset position and the land area 2 may also be other values, which are not listed here. Since the preset position is relatively far from the land area 2, it can avoid the influence of unfavorable factors such as the complex terrain of the near-coastal area, which helps to improve the safety of the submarine cable 11 during the laying process.

[0038] In some embodiments of the present disclosure, after the submarine cable reel 1 is transported to the preset position, the submarine cable transport ship 40 can be anchored by the anchor cable 60 to prevent the submarine cable transport ship 40 from deviating from the preset position during subsequent operations, thereby causing the laying path of the submarine cable 11 to deviate.

[0039] like Figure 1As shown, in step S120 , one end of the submarine cable 11 in the submarine cable reel 1 is pulled from the preset position to the land area 2 , and connected to the sea-land conversion docking box 22 on the land area 2 .

[0040] The land area 2 in the present disclosure may be a shore or near-shore area related to the laying of the submarine cable 11, and the land area 2 may serve as a starting point for connecting the submarine cable 11 with the land power grid. The land area 2 is usually provided with a sea-land conversion docking box 22, a cable trench 23, a transformer, etc., and the land area 2 may receive and convert electric energy from the sea.

[0041] In an exemplary embodiment of the present disclosure, pulling one end of the submarine cable 11 in the submarine cable reel 1 from a preset position to the land area 2 and connecting it to the sea-land conversion docking box 22 on the land area 2 (i.e., step S120) may include steps S210 to S240, wherein: Step S210, constructing a land towing platform 21, on which a towing winch is provided; a sea-land conversion docking box 22 is provided on a side of the land towing platform 21 away from the sea surface.

[0042] The land tractor platform 21 is located in the land area 2. The land tractor platform 21 can provide a stable support point for the traction and lowering of the submarine cable 11. It is mainly used to tract and control the lowering of the submarine cable 11. A tractor winch (not shown in the figure) is provided on the land tractor platform 21. The tractor winch can serve as the main power source for dragging the submarine cable 11. The tractor winch is usually driven by a high-power motor and has sufficient pulling force and control accuracy to ensure that the submarine cable 11 can be lowered into the sea smoothly and at a uniform speed. A sea-land conversion docking box 22 is installed on the side of the land tractor platform 21 away from the sea surface. A cable trench 23 is provided between the sea-land conversion docking box 22 and the land tractor platform 21. The sea-land conversion docking box 22 can be connected to the cable on land.

[0043] Step S220 , connecting one end of the submarine cable 11 in the submarine cable reel 1 to the traction rigging 4 , and traction the end of the traction rigging 4 away from the submarine cable 11 to the land traction platform 21 .

[0044] One end of the submarine cable 11 can be connected to the traction rigging 4. For example, a connector can be used to connect the submarine cable 11 to the traction rigging 4. The traction rigging 4 can be made of a material with high strength and corrosion resistance, which can withstand the huge pulling force of the submarine cable 11 in the water and the test of complex environment. The end of the traction rigging 4 away from the submarine cable 11 can be transported to the towing platform in the land area 2 by the cable-laying ship 50.

[0045] Step S230 , the traction sling 4 is towed by the traction winch to lower the submarine cable 11 in the submarine cable reel 1 , and the traction sling 4 drives the end of the submarine cable 11 to move to the land traction platform 21 .

[0046] like Figure 3 As shown, the traction sling 4 can be connected to the towing winch, and the towing winch can be started to drag the traction sling 4, thereby driving the submarine cable 11 in the submarine cable reel 1 to be gradually lowered into the sea. In this process, the speed and tension of the towing winch can be controlled to prevent the submarine cable 11 from being damaged or tangled.

[0047] It should be noted that, when the towing winch completely pulls the traction rigging 4 to the towing platform, the end of the submarine cable 11 is pulled to the towing platform.

[0048] Step S240 , connecting the end of the submarine cable 11 located on the land towing platform 21 to the sea-land conversion docking box 22 .

[0049] like Figure 4 As shown, after the end of the submarine cable 11 is successfully dragged to the land dragging platform 21, the submarine cable 11 can be placed in the cable trench of the land area 2, the cable trench can be connected to the sea-land conversion docking box 22, and the submarine cable 11 can be connected to the sea-land conversion docking box 22. The sea-land conversion docking box 22 is provided with an electrical or optical fiber interface to achieve seamless docking of the submarine cable 11 with the land network or power system.

[0050] like Figure 1 As shown, in step S130, the submarine cable 11 in the submarine cable reel 1 is lowered along a predetermined route until the submarine cable 11 extends from the land area 2 to the offshore photovoltaic platform 3.

[0051] like Figure 5 As shown, the offshore photovoltaic platform 3 is provided with a plurality of photovoltaic panels (not shown in the figure) distributed side by side, and the photovoltaic panels can convert solar energy into electrical energy. The predetermined route can be a predetermined laying route of the submarine cable 11, and the predetermined route is connected between the preset position and the offshore photovoltaic platform 3, which can serve as a connecting channel between the preset position and the offshore photovoltaic platform 3. The predetermined route can avoid obstacles such as submarine reefs and sunken ships to ensure the safety and feasibility of laying the submarine cable 11.

[0052] During the lowering of the submarine cable 11, the submarine cable transport ship 40 can be slowly started to gradually release the submarine cable 11 and sink it to the seabed along a predetermined route. During this process, the tension of the submarine cable 11 can be adjusted in real time by the tension control system to ensure stable lowering. At the same time, the lowering of the submarine cable 11 can also be monitored by GPS or underwater cameras.

[0053] like Figure 1As shown, in step S140, the seabed mud layer 6 is excavated along the extension direction of the submarine cable 11 to form a submarine cable laying groove, the submarine cable 11 is placed in the submarine cable laying groove, and the submarine cable laying groove is backfilled.

[0054] In some embodiments of the present disclosure, Figure 6 As shown, a submarine cable laying trough can be formed by using a submarine cable laying plough 5. For example, in the process of lowering the submarine cable 11 according to a predetermined route, the submarine cable laying plough 5 can be dropped from the land area 2. The submarine cable laying plough 5 can move in the extension direction of the submarine cable 11 and use its own plow body to dig the seabed mud layer 6 to form a submarine cable laying trough. In this process, the travel speed and excavation depth of the submarine cable laying plough 5 are precisely controlled to ensure that the size and shape of the laying trough meet the needs of laying the submarine cable 11.

[0055] While the submarine cable laying plough 5 is digging the submarine cable laying groove, the submarine cable 11 can be automatically and continuously and smoothly placed in the submarine cable laying groove, and then the excavated seabed mud layer 6 or special backfill is backfilled into the submarine cable laying groove by backfilling equipment, thereby firmly fixing the submarine cable 11 on the seabed. This step can be achieved through an automated control system, ensuring that the position of the submarine cable 11 is accurate and not damaged during the laying process.

[0056] It should be noted that the depth and width of the submarine cable laying groove can be greater than the diameter of the submarine cable 11, so that the submarine cable 11 can be completely buried in the submarine cable laying groove, and sufficient space is reserved to cope with the dynamic changes of the submarine environment (such as sediment flow, water scouring, etc.). After backfilling, the submarine cable 11 is completely covered, which effectively avoids the risk of the submarine cable 11 being displaced or exposed to seawater due to seabed turbulence, and can reduce the need for repair and replacement caused by position displacement or damage, thereby reducing long-term maintenance costs. At the same time, it can reduce the damage to the submarine cable 11 caused by adverse factors such as seawater corrosion and marine biological attachment, which helps to extend the service life of the submarine cable 11.

[0057] In an exemplary embodiment of the present disclosure, a submarine cable laying plow 5 may include a plow body, a submarine cable limiting groove, and a cable pressing device, wherein the shape of the plow body is similar to a traditional agricultural plow, and the front end of the plow body is sharp, which is convenient for cutting into the seabed mud layer 6; the rear end is gradually widened to form a submarine cable laying groove with a moderate width. The plow body can be made of high-strength, corrosion-resistant materials, such as stainless steel or special alloys, as long as it can meet the requirements of high strength and corrosion resistance. Under the action of the drag force, the plow body can move forward along a predetermined route, and its sharp front end first cuts into the seabed mud layer 6. During the process of the plow body moving forward, as the plow body goes deeper, the excavated seabed mud layer 6 is gradually turned over and pushed to both sides, thereby forming a continuous submarine cable laying groove.

[0058] The submarine cable limit groove is located on the side of the plow body away from the seabed, that is, the upper part or side of the plow body. The submarine cable limit groove can be used to lift the submarine cable 11. The submarine cable limit groove can be in the shape of a groove, and its width and depth match the diameter of the submarine cable 11 so as to confine the submarine cable 11 inside. The inner wall of the submarine cable limit groove is usually covered with wear-resistant and non-slip materials to ensure the stability and safety of the submarine cable 11 during the laying process. During the laying process of the submarine cable 11, the submarine cable 11 is guided into the submarine cable limit groove and is gradually lifted to a predetermined height as the plow body advances, and the submarine cable 11 located behind the plow body can be placed in the submarine cable laying groove. The design of the submarine cable limit groove ensures the accurate position of the submarine cable 11 during the laying process and avoids the displacement of the submarine cable 11 caused by changes in the seabed terrain or the action of water flow.

[0059] The cable pressing device can backfill the soil around the submarine cable laying groove. For example, the cable pressing device can be located at the rear of the plow body and is composed of a set of adjustable pressure rollers or pressure plates. These pressure rollers or pressure plates control their downward pressure by hydraulic or mechanical means to ensure that the submarine cable 11 is firmly fixed in the submarine cable laying groove. After the submarine cable 11 is placed in the submarine cable laying groove, the cable pressing device starts to work, and its pressure rollers or pressure plates gently press down to backfill the soil on both sides of the submarine cable laying groove into the groove and compact it tightly. This process not only fixes the position of the submarine cable 11, but also prevents the intrusion of seawater and silt, thereby protecting the integrity of the submarine cable 11.

[0060] like Figure 1 As shown, in step S150 , the submarine cable 11 extending to the offshore photovoltaic platform 3 is fixed on the offshore photovoltaic platform 3 .

[0061] like Figure 5 and Figure 7 As shown, the offshore photovoltaic platform 3 may include a support rod 31 and a support platform 32, wherein the support rod 31 may be made of high-strength, corrosion-resistant materials, such as stainless steel or special alloys, to resist long-term erosion by seawater and mechanical challenges under extreme weather conditions. The shape of the support rod 31 may be cylindrical; in other embodiments of the present disclosure, the shape of the support rod 31 may also be conical, and when the shape of the support rod 31 is conical, its bottom diameter is larger, which can enhance the contact area and stability with the seabed mud layer 6, and the top gradually narrows to facilitate connection with the support platform 32. The support rod 31 may extend in a direction perpendicular to the sea surface, and one end of the support rod 31 penetrates into the seabed and is fixed to the seabed, and the other end extends above the sea surface.

[0062] Please continue to see Figure 5 and Figure 7As shown, the support platform 32 is arranged on the support rod 31 and is located above the sea surface, that is, the support platform 32 is fixed above the sea surface through the support rod 31. The distance between the support platform 32 and the sea surface can be greater than 10 meters. The support platform 32 can be used as the main carrier for installing photovoltaic panels. The material of the support platform 32 can be alloy or other composite materials. The support platform 32 can be used to fix the photovoltaic panels to ensure that the photovoltaic panels can remain stable under various sea conditions.

[0063] In an exemplary embodiment of the present disclosure, fixing the submarine cable 11 extending to the offshore photovoltaic platform 3 on the offshore photovoltaic platform 3 (ie, step S150) may include steps S310 to S330, wherein: Step S310 , after the submarine cable 11 extends to the supporting platform 32 , the submarine cable 11 is cut to separate the submarine cable 11 from the submarine cable reel 1 .

[0064] When the submarine cable 11 is pulled from the seabed to the support platform 32 and reaches the predetermined position, the submarine cable 11 can be cut, thereby separating the submarine cable 11 from the submarine cable reel 1, so as to prepare for the subsequent fixing and electrical connection of the submarine cable 11. Professional submarine cable 11 cutting tools (for example, underwater hydraulic shears or special cable cutters) can be used to ensure that the submarine cable 11 is cut quickly and the cross section is smooth, avoiding damage to the internal structure of the submarine cable 11.

[0065] Step S320 , a submarine cable fixing member 7 is arranged on the support rod 31 , wherein the submarine cable fixing member 7 is provided with a through hole, and the submarine cable 11 passes through the through hole and extends to the support platform 32 .

[0066] like Figure 7 As shown, the submarine cable fixture 7 can be made of corrosion-resistant, high-strength materials, such as stainless steel or special alloys, to ensure long-term stability in the marine environment. A through hole is provided on the submarine cable fixture 7, and the diameter of the through hole can be slightly larger than the outer diameter of the submarine cable 11, so that the submarine cable 11 can pass through smoothly. The submarine cable fixture 7 is located below the sea surface, and the distance between the submarine cable fixture 7 and the seabed can be larger than the distance between it and the sea surface. Such a design can ensure that the submarine cable fixture 7 will not hinder the natural bending of the submarine cable 11, and can effectively limit the shaking of the submarine cable 11 under the action of external forces such as wind and waves. After the submarine cable 11 passes through the through hole, an appropriate margin should be left to accommodate the expansion and contraction of the submarine cable 11 caused by factors such as temperature changes and ocean currents.

[0067] Step S330, a fixing fixture 8 is provided on the submarine cable 11, wherein the fixing fixture 8 is located on a side of the submarine cable fixing member 7 away from the seabed, and one end of the fixing fixture 8 penetrates into the through hole and is interference fit with the inner wall of the through hole.

[0068] Please continue to see Figure 5As shown, the fixing clamp 8 can surround and be fixed on the outer periphery of the submarine cable 11, for example, it can be fixed on the outer periphery of the submarine cable 11 by bonding, clamping, threaded connection, etc. The material of the fixing clamp 8 can be a high-strength, corrosion-resistant titanium alloy material, so as to resist the salt erosion in the seawater and extend the service life. The fixing clamp 8 can be in the shape of a strip, and after it is fixed on the submarine cable 11, it can extend along the length direction of the submarine cable 11. In some embodiments of the present disclosure, the fixing clamp 8 can be in the shape of a cone, and the size of one end close to the submarine cable fixing member 7 can be smaller than the size of the through hole, while the size of the end of the fixing clamp 8 away from the submarine cable fixing member 7 is larger than the size of the through hole. The smaller end of the fixing clamp 8 can be embedded in the through hole and have an interference fit with the through hole, thereby stably fixing the submarine cable 11.

[0069] In an exemplary embodiment of the present disclosure, the offshore photovoltaic cluster cable laying method of the present disclosure may further include: Step S160 , a bending limiter 9 is provided at the bottom of the support rod 31 , and the submarine cable 11 passes through the bending limiter 9 .

[0070] Please continue to see Figure 5 and Figure 7 As shown, the bend limiter 9 may be tubular, for example, it may be an arc-shaped tube, for example, it may be a "J"-shaped tube. The material of the bend limiter 9 may be a high-strength and corrosion-resistant material so as to resist the corrosion of seawater. One end of the bend limiter 9 may be fixed on the seabed, and the other end may extend toward the sea surface. Taking the "J"-shaped tube as an example, the bottom of the J in the "J"-shaped tube may be fixed on the seabed, and the top of the "J" extends toward the sea surface. The tube diameter of the bend limiter 9 may be slightly larger than the diameter of the submarine cable 11 so that the submarine cable 11 can pass smoothly. By arranging the bend limiter 9 on the seabed, the submarine cable 11 can be prevented from forming sharp bends or corners on the seabed, reducing the risk of damage to the submarine cable 11 due to excessive bending, and helping to improve the service life and reliability of the submarine cable 11.

[0071] In an exemplary embodiment of the present disclosure, the offshore photovoltaic cluster cable laying method of the present disclosure may further include step S170 and step S180, wherein: Step S170 , installing a traction net 10 at the end of the submarine cable 11 close to the supporting platform 32 .

[0072] The traction net 10 can be made of high-strength, wear-resistant materials, such as nylon or polyester fibers, and has a hole inside that matches the diameter of the submarine cable 11 so as to tightly wrap the submarine cable 11. Figure 5 and Figure 7As shown, the hauling net 10 can be installed on one end of the submarine cable 11 close to the supporting platform 32. For example, the hauling net 10 can be put on the submarine cable 11, and ensure that its hole is tightly fitted with the submarine cable 11. Then, the hauling net 10 is fixed to the submarine cable 11 using a special fastening belt or binding belt to ensure that it will not fall off or loosen during the hauling process.

[0073] Step S180, installing the guide pulley 20 and the traction rope 30 on the support platform 32, the traction rope 30 passes around the guide pulley 20 and is connected to the traction net 10; the traction rope 30 can drive the fixing clamp 8 and the submarine cable 11 to pass through the bending limiter 9.

[0074] Please continue to see Figure 5 and Figure 7 As shown, a guide pulley 20 can be installed in the support platform 32 near the edge of the submarine cable 11. Bolts or other fixings can be used to firmly fix the guide pulley 20 on the support platform 32. One end of the traction rope 30 passes through the guide pulley 20, and is connected to the traction net 10 after passing around the guide pulley 20. The connection method can be knotting, using a connecting buckle or other reliable connection methods to ensure that the traction rope 30 and the traction net 10 are firmly connected and will not fall off. The other end is used to apply tension.

[0075] Before the formal towing, the traction rope 30 and the guide pulley 20 can be tested to ensure that they can work smoothly without jamming or excessive friction. At the same time, the position and angle of the guide pulley 20 can be adjusted to ensure that the traction rope 30 can maintain appropriate tension and direction when passing around the guide pulley 20. After the towing starts, the transmission effect of the guide pulley 20 and the traction rope 30 can drive the traction net 10, the fixing clamp 8 and the submarine cable 11 to pass through the bend limiter 9.

[0076] In an exemplary embodiment of the present disclosure, multiple submarine cables 11 can be laid at the same time, and the laying efficiency is high. That is, multiple submarine cable reels 1 can be installed on the submarine cable transport ship 40 at the same time, and the ends of multiple submarine cable reels 1 can be towed to the land area 2 at the same time by the towing rigging 4, and multiple submarine cables 11 can be connected to different cables in the sea-land conversion docking box 22 respectively. And when the submarine cable reel 1 is lowered according to the predetermined route, the submarine cables 11 in multiple submarine cable reels 1 can be lowered at the same time. Correspondingly, the submarine cable burying plow 5 may include multiple plow bodies distributed side by side, and each plow body is correspondingly provided with a submarine cable limit groove and a cable pressing device, thereby realizing the synchronous laying of multiple submarine cables 11. After reaching the offshore photovoltaic platform 3, multiple submarine cables 11 can be fixed on the offshore photovoltaic platform 3, and multiple submarine cables 11 can be connected to the photovoltaic panels in the offshore photovoltaic platform 3 at the same time. It should be noted that the voltage level or current capacity of different submarine cables can be the same or different, and no special limitation is made here.

[0077] In an exemplary embodiment of the present disclosure, the offshore photovoltaic cluster cable laying method of the present disclosure may further include: Step S190: performing an electrical performance test on the submarine cable 11.

[0078] The submarine cable 11 can be subjected to a DC resistance test, an insulation resistance test and a withstand voltage test to obtain the conductivity, insulation and withstand voltage performance of the submarine cable 11. When the test results of the conductivity, insulation and withstand voltage performance meet the preset standards, it is judged that the cable laying is normal and the cable laying is completed.

[0079] In an exemplary embodiment of the present disclosure, the offshore photovoltaic cluster cable laying method of the present disclosure may further include: Step S200 , connecting the submarine cable 11 to the photovoltaic panels on the offshore photovoltaic platform 3 .

[0080] After the electrical inspection is complete, the submarine cable 11 can be connected to the photovoltaic panel, and the current generated by the photovoltaic panel can be directly transmitted to the power grid, energy storage system or inverter on land through the submarine cable 11, thereby realizing the utilization of offshore photovoltaic resources.

[0081] It should be noted that, although the steps of the offshore photovoltaic cluster cable laying method in the present disclosure are described in a specific order in the accompanying drawings, this does not require or imply that the steps must be performed in this specific order, or that all the steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps, etc.

[0082] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A method for laying offshore photovoltaic cluster cables, characterized in that: include: Transporting the submarine cable reel to a preset location on the sea surface; Pulling one end of the submarine cable in the submarine cable reel from the preset position to the land area, and connecting it to the sea-land conversion docking box on the land area; Lowering the submarine cable in the submarine cable reel according to a predetermined route until the submarine cable extends from the land area to the offshore photovoltaic platform; Excavating a seabed mud layer along the extension direction of the submarine cable to form a submarine cable laying groove, placing the submarine cable in the submarine cable laying groove, and backfilling the submarine cable laying groove; The submarine cable extending to the offshore photovoltaic platform is fixed on the offshore photovoltaic platform.

2. The method for laying a submarine cable according to claim 1, characterized in that: The step of pulling one end of the submarine cable in the submarine cable reel from the preset position to the land area and connecting it to the sea-land conversion docking box on the land area comprises: Building a land towing platform, wherein a towing winch is provided on the land towing platform; a sea-land conversion docking box is provided on the side of the land towing platform away from the sea surface; Connecting one end of the submarine cable in the submarine cable reel to a traction rigging, and traction the end of the traction rigging away from the submarine cable to the land traction platform; The traction winch is used to tow the traction rigging to lower the submarine cable in the submarine cable reel, and the traction rigging drives the end of the submarine cable to move to the land traction platform; The end of the submarine cable located on the land towing platform is connected to the sea-land conversion docking box.

3. The method for laying a submarine cable according to claim 1, characterized in that: The submarine cable laying groove is formed by using a submarine cable laying plow, and the depth and width of the submarine cable laying groove are both greater than the diameter of the submarine cable.

4. The method for laying a submarine cable according to claim 3, characterized in that: The submarine cable laying plow includes a plow body, a submarine cable limiting groove and a cable pressing device. The submarine cable limiting groove is located on the side of the plow body away from the seabed. The submarine cable limiting groove is used to lift the submarine cable. During the forward movement of the plow body, the submarine cable can excavate the seabed mud layer and form the submarine cable laying groove; and the submarine cable located behind the plow body can be placed in the submarine cable laying groove; the cable pressing device can backfill the soil around the submarine cable laying groove.

5. The method for laying a submarine cable according to claim 1, characterized in that: The offshore photovoltaic platform comprises a support rod and a support platform, wherein the support rod is fixed in a direction perpendicular to the sea surface, and the support platform is arranged on the support rod and is located above the sea surface; The step of fixing the submarine cable extending to the offshore photovoltaic platform on the offshore photovoltaic platform comprises: After the submarine cable is extended to the supporting platform, cutting the submarine cable to separate the submarine cable from the submarine cable reel; A submarine cable fixing piece is arranged on the support rod, wherein the submarine cable fixing piece is provided with a through hole, the submarine cable passes through the through hole and extends to the support platform; A fixing clamp is arranged on the submarine cable, and the fixing clamp is located on a side of the submarine cable fixing piece away from the seabed, and one end of the fixing clamp penetrates into the through hole and is interference fit with the inner wall of the through hole.

6. The method for laying a submarine cable according to claim 5, characterized in that: The submarine cable laying method also includes: A bending limiter is arranged at the bottom of the supporting rod, and the submarine cable passes through the bending limiter.

7. The method for laying a submarine cable according to claim 6, characterized in that: The bending limiter is an arc-shaped tube.

8. The method for laying a submarine cable according to claim 6, characterized in that: The submarine cable laying method also includes: Installing a traction net in the end of the submarine cable close to the supporting platform; A guide pulley and a traction rope are installed on the support platform. The traction rope passes around the guide pulley and is connected to the traction net. The traction rope can drive the fixing fixture and the submarine cable to pass through the bending limiter.

9. The method for laying a submarine cable according to claim 1, characterized in that: The submarine cable laying method also includes: Conducting electrical performance tests on the submarine cable.

10. The method for laying a submarine cable according to any one of claims 1 to 9, characterized in that: The submarine cable laying method also includes: The submarine cable is connected to the photovoltaic panels on the offshore photovoltaic platform.

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