Following type cable mooring structure and construction method thereof

Abstract

The invention relates to the technical field of ocean engineering, and discloses an accompanying type cable mooring structure and a construction method thereof.The accompanying type cable mooring structure comprises a mooring cable, a submarine cable dynamic section, a submarine cable static section and a plurality of bearing clamps, the mooring cable and the submarine cable dynamic section are connected to a floating type offshore photovoltaic platform, and the submarine cable static section and the bearing clamps are connected to a fixed type draught fan platform; and a mooring cable of the floating type offshore photovoltaic platform towards the direction of the fixed type fan platform is used as a binding mother rope of the submarine cable dynamic section. According to the adjoint type cable mooring structure and the construction method thereof, the submarine cable dynamic section and the mooring cable, facing the fan direction, of the floating type offshore photovoltaic platform are bound through the bearing clamp, cable combining type arrangement of a submarine cable dynamic section-mooring cable composite structure is formed, integration of the submarine cable dynamic section and a mooring system on the routing and structure is achieved, and the structure of the submarine cable dynamic section and the mooring system is optimized. And meanwhile, the submarine cable dynamic section is fixed to the bearing clamp through shielding of the mooring cable, the effect of waves and a flow field on the submarine cable dynamic section is weakened, and the abrasion and vibration risks are reduced.

Description

Technical Field

[0001] This invention relates to the technical field of marine engineering, specifically to an accompanying cable mooring structure and its construction method. Background Technology

[0002] Faced with the multiple pressures of land scarcity and energy transition, the wind-solar co-location model has emerged. This integrated development model is an innovative, three-dimensional, and intensive utilization solution for marine space. It integrates offshore wind power and offshore photovoltaic power deployment in the same sea area, achieving synergistic enhancement of ecological, economic, and social benefits through sharing marine space, energy systems, and operation and maintenance resources.

[0003] In wind and solar co-location projects, the electricity generated by the offshore floating photovoltaic array is inverted and collected, then connected to a nearby fixed wind turbine platform via a submarine cable. The cable is then connected to the existing wind turbine tower, stepped up, and then connected to the low-voltage side of the wind turbine transformer before being transmitted to the grid via the wind power transmission line, thus achieving wind and solar co-location. The dynamic cable, as the "lifeline" connecting the floating offshore photovoltaic platform and the seabed, has its design and laying quality directly related to the safety and lifespan of the entire system.

[0004] Dynamic cable technology is gradually becoming a focal technology in the field of marine engineering. However, it started relatively late and still has prominent problems in engineering practice: submarine cables and mooring cables are usually laid out independently, which leads to complex layout in the sea area. In the limited sea space, cables and mooring cables are prone to crossing and colliding, resulting in chaotic layout. Moreover, the independent laying of submarine cables requires separate laying of submarine cables and installation of mooring systems, which increases the time for ship operation and increases construction and maintenance costs. In shallow water areas, submarine cables are prone to excessive sag, arching above the water surface, or friction with the seabed due to platform offset, causing the cable bending radius to exceed the design threshold and resulting in fatigue damage, which seriously affects its service life and operational reliability. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides an accompanying cable mooring structure, which solves the problems mentioned in the background.

[0006] The present invention provides the following technical solution: an accompanying cable mooring structure and its construction method, comprising: a mooring cable connected to a floating offshore photovoltaic platform and a main submarine cable set between the floating offshore photovoltaic platform and a fixed wind turbine platform, wherein multiple carrying clamps are provided between the main submarine cable and the mooring cable. The main submarine cable includes a dynamic section and a static section. The mooring cable of the floating offshore photovoltaic platform facing the fixed wind turbine platform serves as the binding mother rope of the dynamic section. The dynamic section is bound to the mooring cable by multiple carrying clamps. The static section is connected to the fixed wind turbine platform. A bottom-touching protection device is installed near the bottom-touching point of the dynamic section.

[0007] Preferably, the distance between two adjacent carrying clamps is 2-3 meters.

[0008] Preferably, both the floating offshore photovoltaic platform and the fixed wind turbine platform are equipped with J-shaped pipes. The dynamic section of the submarine cable is bound to the mooring cable starting 5 meters away from the J-shaped pipe of the floating offshore photovoltaic platform and continuing until the mooring cable is connected to the steel chain.

[0009] Preferably, both the dynamic section and the static section of the submarine cable are provided with bending stiffeners at their ends to increase the bending stiffness of the dynamic section.

[0010] Preferably, the bending reinforcement of the dynamic section of the submarine cable is installed at the bottom end of the J-shaped pipe of the floating offshore photovoltaic platform, and the bending reinforcement of the static section of the submarine cable is installed at the bottom end of the J-shaped pipe of the fixed wind turbine platform.

[0011] Preferably, the bottom protection device is a protective tube, and the protective tube is sleeved on the surface of the dynamic section of the submarine cable.

[0012] A construction method for an accompanying cable mooring structure includes the following steps: Step S1, transshipment of submarine cable dynamic segment: transport the submarine cable dynamic segment and the bending reinforcement pre-installed on the submarine cable dynamic segment to the cable laying vessel. Step S2: The dynamic section of the submarine cable is landed on the floating offshore photovoltaic platform; Step S3, Dynamic Cable Segment Deployment and Binding Construction: After the dynamic cable is landed, divers will install carrying clamps underwater when laying the dynamic cable segment. The cable-laying vessel will release the dynamic cable segment along the mooring cable and simultaneously bind buoys at calculated intervals. Starting from 5 meters away from the J-tube, the dynamic cable segment will be bound to the mooring cable using carrying clamps until the connection between the mooring cable and the steel chain is reached. The distance between two adjacent carrying clamps is 2-3 meters. Step S4: Install the bottoming-out protection device; Step S5, laying of the static section of the submarine cable: After the dynamic section of the submarine cable touches the bottom, the static section of the submarine cable is laid along the seabed using conventional laying methods with a burial plow. Step S6: The static section of the submarine cable is landed on the fixed wind turbine platform.

[0013] Preferably, step S2 includes: Step S21: Deploy traction equipment on the floating offshore photovoltaic platform; Step S22: Position the cable-laying vessel near the floating offshore photovoltaic platform, ensuring that the stern of the cable-laying vessel faces the J-shaped opening of the floating offshore photovoltaic platform and maintains a certain safe distance from the mooring cable. Step S23: The diver removes the bottom cover plate of the J-shaped pipe on the side of the floating offshore photovoltaic platform, inserts a traction steel wire, and connects the dynamic section of the submarine cable to the traction equipment on the side of the floating offshore photovoltaic platform through the traction steel wire. In step S24, the platform winch pulls the cable traction head to land the submarine cable until the flange of the underwater bending reinforcement is tightly attached to the flange of the J-shaped pipe at the bottom of the platform. Divers go underwater to install fixing bolts to secure the bending reinforcement, while the upper part of the floating offshore photovoltaic platform is anchored.

[0014] Preferably, in step S4, a bottoming protection device is installed near the bottoming point of the dynamic section of the submarine cable; the bottoming protection device is a protective tube, and the installation of the protective tube begins after the dynamic section of the submarine cable is dropped to the marked position for installing the bottoming protection device.

[0015] Preferably, in step S6, the landing length is measured, the length of the required static section of submarine cable from the underwater J-tube flare to the wind turbine terminal is accurately calculated, the excess cable is cut off and sealed with lead, and then led up to the wind turbine through the J-tube of the fixed wind turbine platform, and the bending limiter of the static section of submarine cable is fixed.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention achieves the integration of the dynamic segment of the submarine cable and the mooring cable of the floating offshore photovoltaic platform facing the wind turbine in a parallel cable arrangement by binding the dynamic segment of the submarine cable with the mooring cable in the direction of the wind turbine using a carrying clamp. This prevents the dynamic segment of the submarine cable and the mooring cable from crossing or colliding. At the same time, the dynamic segment of the submarine cable is shielded by the mooring cable and fixed by the carrying clamp, which reduces the impact of waves and current fields on the dynamic segment of the submarine cable and reduces the risk of wear and vibration.

[0017] 2. This invention, by adopting the above-mentioned composite structure and sharing the mooring cable route, combines the laying of dynamic sections of submarine cables with the mooring system, which simplifies the cable laying process, reduces independent construction procedures, and solves the technical problems of numerous construction procedures, long ship and machinery operation time, and high maintenance costs caused by independent cable laying.

[0018] 3. This invention installs a bending reinforcement on the dynamic section of the submarine cable on the side of a floating offshore photovoltaic platform, guided by a J-shaped tube. This effectively controls the bending radius of the submarine cable at the platform end and reduces dynamic fatigue. At the same time, a bottom-contact protection device is installed near the bottom contact point of the dynamic section of the submarine cable to resist seabed friction and swaying collisions at the seabed end. This solves the technical problems of sagging, excessive bending radius, and fatigue damage and shortened lifespan of the dynamic and static sections of the submarine cable in shallow water areas due to platform movement. Attached Figure Description

[0019] Figure 1 This is a top view of the floating offshore photovoltaic platform of the present invention; Figure 2 This is a diagram showing the dynamic arrangement of the mooring cable and submarine cable of the present invention. Figure 3 This is a schematic diagram illustrating the dynamic binding of the mooring cable and the submarine cable of the present invention; Figure 4 This is a flowchart illustrating the construction process of this invention.

[0020] In the diagram: 1. Floating offshore photovoltaic platform; 2. Fixed wind turbine platform; 3. Mooring cable; 4. Dynamic section of submarine cable; 5. Static section of submarine cable; 6. Backing clamp; 7. Bottom contact protection device; 8. J-tube; 9. Bending reinforcement. Detailed Implementation

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] Please see Figure 1-4 A type of accompanying cable mooring structure includes: a mooring cable 3 connected to a floating offshore photovoltaic platform 1 and a main submarine cable set between the floating offshore photovoltaic platform 1 and a fixed wind turbine platform 2. Multiple carrying clamps 6 are set between the main submarine cable and the mooring cable 3. The main submarine cable includes a dynamic section 4 and a static section 5. The mooring cable 3 facing the fixed wind turbine platform 2 from the floating offshore photovoltaic platform 1 serves as the binding mother rope for the dynamic section 4. The dynamic section 4 is bound to the mooring cable 3 by multiple carrying clamps 6. The static section 5 is connected to the fixed wind turbine platform 2. A bottoming protection device 7 is set near the bottoming point of the dynamic section 4. The distance between two adjacent carrying clamps 6 is 2-3 meters.

[0023] Both the floating offshore photovoltaic platform 1 and the fixed wind turbine platform 2 are equipped with J-shaped pipes 8. The dynamic section 4 of the submarine cable is bound to the mooring cable 3 starting from 5 meters or 8 meters away from the J-shaped pipe of the floating offshore photovoltaic platform 1, and continues to be bound to the connection between the mooring cable 3 and the steel chain. Both the dynamic section 4 and the static section 5 of the submarine cable are equipped with bending stiffeners 9 to increase the bending stiffness of the dynamic section 4.

[0024] The bending reinforcement 9 of the dynamic section 4 of the submarine cable is installed at the bottom end of the J-shaped tube 8 of the floating offshore photovoltaic platform 1, and the bending reinforcement 9 of the static section 5 of the submarine cable is installed at the bottom end of the J-shaped tube 8 of the fixed wind turbine platform 2.

[0025] Please see Figure 2 The bottom protection device 7 is a protective tube, and the protective tube is sleeved on the surface of the dynamic section 4 of the submarine cable.

[0026] Please see Figure 4 A construction method for an accompanying cable mooring structure includes the following steps: Step S1, transshipment of submarine cable dynamic segment 4: transport submarine cable dynamic segment 4 and the bending reinforcement 9 pre-installed on submarine cable dynamic segment 4 to the cable laying vessel. Step S2: The dynamic segment 4 of the submarine cable lands on the floating offshore photovoltaic platform 1; Step S3, laying and binding of dynamic cable segment 4: After the dynamic cable is landed, when laying dynamic cable segment 4, divers will install carrying clamps 6 underwater. The cable-laying vessel will release dynamic cable segment 4 along mooring cable 3, and at the same time, tie buoys at the calculated intervals. Starting from 5 meters or 8 meters away from the J-shaped pipe, the carrying clamps 6 will bind dynamic cable segment 4 to mooring cable 3 until the connection between mooring cable 3 and steel chain. The distance between two adjacent carrying clamps 6 is 2-3 meters. Step S4: Install bottom contact protection device 7; Step S5, laying of static section 5 of submarine cable: After dynamic section 4 of submarine cable touches the bottom, static section 5 of submarine cable is laid along the seabed using conventional laying method with burying plow. Step S6: The static section 5 of the submarine cable is landed on the fixed wind turbine platform 2.

[0027] Step S2 includes: Step S21: Deploy traction equipment on the floating offshore photovoltaic platform 1; Step S22: Position the cable-laying vessel near the floating offshore photovoltaic platform 1, so that the stern of the cable-laying vessel is facing the J-type pipe 8 opening of the floating offshore photovoltaic platform 1 and maintains a certain safe distance from the mooring cable 3. Step S23: The diver removes the bottom cover plate of the J-shaped pipe 8 on the side of the floating offshore photovoltaic platform 1, inserts a traction steel wire, and connects the dynamic section 4 of the submarine cable to the traction equipment on the side of the floating offshore photovoltaic platform 1 through the traction steel wire. In step S24, the platform winch pulls the cable traction head to land the submarine cable until the flange of the underwater bending reinforcement 9 is tightly attached to the flange of the J-shaped pipe 8 at the bottom of the platform. Divers go underwater to install fixing bolts to fix the bending reinforcement 9, while the floating offshore photovoltaic platform 1 is anchored.

[0028] In step S4, a bottoming protection device 7 is installed near the bottoming point of the dynamic section 4 of the submarine cable. The bottoming protection device 7 is a protective tube. The installation of the protective tube begins after the dynamic section 4 of the submarine cable is dropped to the marked position for installing the bottoming protection device.

[0029] In step S6, the landing length is measured, the length of the required static section 5 of the submarine cable from the flared end of the underwater J-tube 8 to the wind turbine terminal is accurately calculated, the excess cable is cut off and sealed with lead, and then led up to the wind turbine through the J-tube 8 of the fixed wind turbine platform 2. The bending limiter of the static section 5 of the submarine cable is fixed.

[0030] In one specific embodiment: the mooring cable 3 on the floating offshore photovoltaic platform 1 that is closest to and faces the fixed wind turbine platform 2 is selected as the binding mother rope. One end of this mooring cable 3 is anchored to the seabed, and the other end is connected to the floating offshore photovoltaic platform 1 to provide it with mooring force. A special submarine cable dynamic section 4 is used, which has good flexibility and fatigue resistance.

[0031] Multiple carrying clamps 6 are used to securely bind the dynamic segment 4 of the submarine cable to the selected mooring cable 3. The installation spacing between adjacent carrying clamps 6 is preferably 2 to 3 meters to ensure that the two can move in coordination under the action of waves and ocean currents, and avoid mutual impact and wear. The binding starting point is located about 5 meters away from the outlet of the 1J-type pipe 8 of the floating offshore photovoltaic platform, and the binding ending point extends to the vicinity of the connection point between the mooring cable 3 and the seabed steel chain. This binding ensures that the dynamic segment 4 of the submarine cable is guided and protected by the mooring cable 3 in most of the dynamic area from the platform to the near seabed.

[0032] A bending stiffener 9 is installed at the point where the dynamic section 4 of the submarine cable enters the J-shaped pipe 8 of the floating offshore photovoltaic platform 1. This component is pre-installed on the dynamic section 4 and the static section 5 of the submarine cable at the factory. On-site, it is fixed to the flange of the J-shaped pipe 8 via the flange on the bending stiffener 9. Its function is to locally increase the bending stiffness of the submarine cable, ensuring that the bending radius of the dynamic section 4 and the static section 5 at the opening of the J-shaped pipe 8 remains within the design safety threshold when the platform moves, preventing fatigue damage caused by excessive bending. At the same time, it transfers the end tension load of the dynamic section 4 of the submarine cable to the structure of the floating offshore photovoltaic platform 1. Near the point where the dynamic section 4 of the submarine cable contacts the seabed, a bottom contact protection device 7, such as a protective pipe or protective tube, is installed to prevent the submarine cable from rubbing or colliding with the seabed when it swings under the action of ocean currents, thus preventing damage to the dynamic section 4 of the submarine cable.

[0033] After the dynamic section 4 of the submarine cable touches the bottom, its end is connected underwater to the static section 5 of the submarine cable. The static section 5 is responsible for the stable transmission of power on the seabed. The other end of the static section 5 is led up through the J-shaped pipe 8 reserved on the fixed wind turbine platform 2 and finally connected to the wind turbine box transformer to complete the entire power transmission circuit.

[0034] The specific steps of the construction method of the present invention are as follows: 1. Transshipment of Dynamic Section 4 of Submarine Cable: The dynamic section 4 of submarine cable, along with the pre-installed anchoring and bending reinforcement 9, is coiled on a special iron tray, transported to the dock, and transshipped onto a cable-laying vessel equipped with dynamic positioning function.

[0035] II. Landing of the submarine cable dynamic section 4 onto the floating offshore photovoltaic platform 1: First, the traction equipment such as the pulley winch and pulleys is transferred and installed onto the already positioned floating offshore photovoltaic platform 1.

[0036] The cable-laying vessel uses its positioning function to precisely position itself near the floating offshore photovoltaic platform 1, ensuring that its stern faces the entrance of the J-shaped pipe 8 of the floating offshore photovoltaic platform 1 and maintains a safe distance from the mooring cable 3 of the floating offshore photovoltaic platform 1.

[0037] Divers were dispatched to the water to remove the waterproof cover at the bottom of J-shaped pipe 8, and then a traction steel wire was threaded through it.

[0038] Connect the traction steel wire to the traction head at the end of the dynamic section 4 of the submarine cable, start the pull winch on the floating offshore photovoltaic platform 1, and slowly pull the dynamic section 4 of the submarine cable through the J-shaped tube 8. Continue pulling until the flange of the underwater bending reinforcement 9 is tightly fitted with the flange at the bottom of the J-shaped tube 8.

[0039] Divers operate underwater, rotating the flange and aligning the bolt holes, installing and tightening the fixing bolts, while simultaneously completing the anchoring operation of the dynamic section 4 of the submarine cable on the upper part of the platform, firmly fixing it to the floating offshore photovoltaic platform 1 structure.

[0040] III. Laying and Binding of Dynamic Cable Segment 4: After the initial end of dynamic cable segment 4 is secured on land, the cable-laying vessel begins to slowly move along the pre-planned mooring cable route 3, simultaneously releasing dynamic cable segment 4. During this process: At pre-calculated intervals, buoys are tied to the dynamic section 4 of the submarine cable to provide temporary buoyancy, control the cable's entry into the water, and facilitate subsequent operations.

[0041] When the submarine cable is released to a distance of approximately 5 meters from J-tube 8, underwater operations begin, with divers using backpack clamps 6 to secure the dynamic section 4 of the submarine cable to the mooring cable 3. The securing operation continues, with backpack clamps 6 installed one by one at intervals of 2-3 meters until the mooring cable 3 connects to the steel chain.

[0042] IV. Installation of Bottom Contact Protection Device 7: When the cable-laying vessel drops the dynamic section 4 of the submarine cable to the bottom contact point marked on the design drawings, the installation of the bottom contact protection device 7 begins. Construction personnel, taking advantage of the space on the stern deck, install the protective pipe in sections on the dynamic section 4 of the submarine cable, lowering one section at a time until the entire bottom contact protection section is installed and placed at the predetermined position on the seabed.

[0043] V. Laying and Connection of Static Cable Segment 5: After the dynamic cable segment 4 has fully reached the seabed, it is connected underwater to the static cable segment 5 at its end. The cable-laying vessel then slowly releases the static cable segment 5 along the designed seabed route. Upon reaching the designated burial starting point, a self-propelled burial plow is used for conventional laying operations to bury the static cable segment 5 below the seabed for protection.

[0044] VI. Submarine cable static section 5 landing on fixed wind turbine platform 2: Accurately measure the required submarine cable landing length from the flared end of J-type pipe 8 on fixed wind turbine platform 2 to the transformer terminal.

[0045] Install bending reinforcement 9 at the corresponding position of the static section 5 of the sea cable on the construction vessel.

[0046] Cut off the excess static section 5 of the submarine cable and seal the end with lead for waterproofing.

[0047] The static section 5 of the submarine cable is pulled from the seabed through the J-shaped pipe 8 of the fixed wind turbine platform 2 into the platform, and finally connected to the wind turbine transformer box, completing the entire installation work.

[0048] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A companion cable mooring structure, characterized by, The utility model relates to a kind of floating offshore photovoltaic platform and fixed wind turbine platform connection method, including: Mooring cable (3) connected on floating offshore photovoltaic platform (1) and total submarine cable between floating offshore photovoltaic platform (1) and fixed wind turbine platform (2) are arranged, and multiple back-carrying clamps (6) are arranged between total submarine cable and mooring cable (3); The total submarine cable includes submarine cable dynamic section (4) and submarine cable static section (5), and the mooring cable (3) of floating offshore photovoltaic platform (1) is as the binding female rope of submarine cable dynamic section (4) towards fixed wind turbine platform (2) direction, the submarine cable dynamic section (4) is bound together with the mooring cable (3) by multiple back-carrying clamps (6), and the submarine cable static section (5) is connected on fixed wind turbine platform (2), and the bottom-touching point of the submarine cable dynamic section (4) is provided with bottom-touching section protection device (7).

2. An alongside cable mooring structure according to claim 1, characterised in that, The interval of adjacent two back-carrying clamps (6) is 2-3 meters.

3. An alongside cable mooring structure according to claim 1, characterised in that, J type pipe (8) is arranged on floating offshore photovoltaic platform (1) and fixed wind turbine platform (2), and the submarine cable dynamic section (4) is bound with the mooring cable (3) from 5 meters away from J type pipe (8) of the floating offshore photovoltaic platform (1), and is bound to the connection place of the mooring cable (3) and steel chain.

4. An alongside cable mooring structure according to claim 3, characterised in that, The end of the submarine cable dynamic section (4) and submarine cable static section (5) is provided with bending reinforcement (9) for increasing the bending stiffness of submarine cable dynamic section (4).

5. An alongside cable mooring structure according to claim 4, characterised in that, The bending reinforcement (9) of the submarine cable dynamic section (4) is installed at the bottom end of J type pipe (8) of the floating offshore photovoltaic platform (1), and the bending reinforcement (9) at the end of submarine cable static section (5) is installed at the bottom end of J type pipe (8) of fixed wind turbine platform (2).

6. An alongside cable mooring structure according to claim 1, characterised in that, The bottom-touching section protection device (7) is protection pipe, and protection pipe is sleeved on the surface of submarine cable dynamic section (4).

7. A method of construction of a companion cable mooring structure, characterised in that, The utility model relates to a kind of floating offshore photovoltaic platform and fixed wind turbine platform connection method, including: Step S1, submarine cable dynamic section (4) over-replacement shipment: submarine cable dynamic section (4) and bending reinforcement (9) preloaded on submarine cable dynamic section (4) are transported to cable-laying ship; Step S2, submarine cable dynamic section (4) lands on floating offshore photovoltaic platform (1); Step S3, submarine cable dynamic section (4) is thrown and bound construction: after the beginning of dynamic cable landing is completed, when laying submarine cable dynamic section (4), diver installs back-carrying clamp (6) underwater, and cable-laying ship releases submarine cable dynamic section (4) along mooring cable (3), simultaneously binds and ties float ball according to calculated interval, and submarine cable dynamic section (4) is bound with mooring cable (3) from 5 meters away from J type pipe (8) using back-carrying clamp (6), and is bound to the connection place of mooring cable (3) and steel chain, and the interval of adjacent two back-carrying clamps (6) is 2-3 meters; Step S4, install bottom-touching section protection device (7); Step S5, submarine cable static section (5) laying: after submarine cable dynamic section (4) touches the bottom, submarine cable static section (5) is laid along seabed, and conventional laying is carried out using burying plough; Step S6, submarine cable static section (5) lands on fixed wind turbine platform (2).

8. A method of installing an attendant cable mooring according to claim 7, wherein, The step S2 includes: Step S21, traction equipment is arranged on the floating offshore photovoltaic platform (1). Step S22, the cable-laying ship is positioned near the floating offshore photovoltaic platform (1), the stern of the cable-laying ship is directed to the direction of the J-shaped pipe (8) of the floating offshore photovoltaic platform (1) and keeps a certain safety distance from the mooring cable (3); Step S23, the diver removes the bottom cover plate of the J-shaped pipe (8) of the floating offshore photovoltaic platform (1), sets the traction steel wire, and connects the dynamic section (4) of the submarine cable with the traction equipment of the floating offshore photovoltaic platform (1) through the traction steel wire; Step S24, the platform winch pulls the cable traction head to land the submarine cable until the flange of the underwater bending reinforcement (9) is close to the flange of the J-shaped pipe (8) of the platform bottom, the diver installs the fixing bolt to fix the bending reinforcement (9), and the upper part of the floating offshore photovoltaic platform (1) is anchored.

9. A method of installing an attendant cable mooring according to claim 7, wherein, In step S4, the bottom-touching section protection device (7) is installed near the bottom-touching point of the dynamic section (4) of the submarine cable; the bottom-touching section protection device (7) is a protection pipe, and when the dynamic section (4) of the submarine cable is thrown and reaches the installation position of the bottom-touching protection device, the protection pipe is installed.

10. A method of installing an attendant cable mooring according to claim 7, wherein, In step S6, the landing length is measured, the length of the static section (5) of the submarine cable required from the J-shaped pipe (8) to the terminal of the wind turbine is accurately calculated, the remaining cable is cut off and lead-sealed, the static section (5) of the submarine cable is introduced into the wind turbine through the J-shaped pipe (8) of the fixed wind turbine platform (2), and the bending limiter (9) of the static section (5) of the submarine cable is fixed.

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