Dynamic submarine cable system for multiple platforms

Abstract

The utility model discloses a dynamic submarine cable system for multiple platforms, which comprises a dynamic submarine cable, a bending limiter, J-shaped cable protection pipes, a buoyancy block, a floating type photovoltaic platform and a fan tower drum, two groups of J-shaped cable protection pipes are respectively arranged on the floating type photovoltaic platform and the fan tower drum, and the bending limiter is arranged at the bottom of each J-shaped cable protection pipe; the dynamic submarine cable penetrates through the J-shaped cable protection pipes and the bending limiting devices on the two sides, and a plurality of buoyancy blocks are arranged on the dynamic submarine cable and located between the two bending limiting devices in a sleeving mode. The dynamic cable system can adapt to changes of marine environments such as waves, tides and ocean currents, and therefore the safety performance of submarine cables is improved; if the tension of the submarine cable is too large, the wet weight can be reduced by increasing the length of the submarine cable or adjusting the using number of the buoyancy blocks, and if the curvature of the submarine cable is too large, the dynamic section length of the submarine cable needs to be shortened, and meanwhile, the tension is increased and adjusted to meet the requirement.

Description

Technical Field

[0001] The utility model relates to the technical field of submarine cables, in particular to a dynamic submarine cable system for multiple platforms. Background Art

[0002] Under the dual carbon background, my country requires that renewable energy account for 50% of the country's total electricity consumption around 2025, and electric energy will gradually shift to green electricity. Among them, offshore photovoltaic projects have been widely promoted due to their advantages such as sufficient sunshine, land resource conservation, and wind and solar integration. They have great potential, especially in my country's vast shallow sea areas.

[0003] Currently, the mainstream submarine cable structures are divided into three-core and single-core x3. Among them, the production of three-core submarine cables is more difficult than that of single-core submarine cables. However, from the perspective of later laying, operation and maintenance, three-core submarine cables have the advantages of small laying engineering volume, high mechanical strength, and small sea area. Therefore, they are the main structure in the future and are widely used in offshore wind power and high-power transmission between land and islands. Submarine cables adopt a fixed laying method. Traditional submarine cables have large cross-sections and thick armor protection, so they are suitable for high-power fixed platform transmission scenarios.

[0004] With the rapid development of surface photovoltaic technology in recent years, the application mode of photovoltaic power generation has shifted from traditional land photovoltaic and lake photovoltaic to shallow-water photovoltaic, intertidal photovoltaic, and wind-solar co-existing forms. The lateral floating and longitudinal drop of photovoltaic modules have increased, which has also put forward higher requirements on the tensile strength, fatigue resistance and waterproof performance of cables. The existing fixed submarine cables have high cable rigidity and can provide stable support, but their size and weight are extremely large, which is not suitable for the dynamic environment of the sea. After long-term reciprocating operation, problems such as conductor or armor breakage and insulation wear and breakdown will occur. Utility Model Content

[0005] The technical problem to be solved by the present invention is: how to provide a dynamic submarine cable system for use on multiple platforms.

[0006] In order to solve the above technical problems, the present invention provides the following technical solutions:

[0007] A dynamic submarine cable system for multiple platforms includes a dynamic submarine cable, a bend limiter, a J-shaped cable protection tube, a buoyancy block, and a floating photovoltaic platform and a wind turbine tower installed above sea level. The J-shaped cable protection tubes are provided in two sets, one installed on the floating photovoltaic platform and the other on the wind turbine tower. A bend limiter is provided at the bottom of the J-shaped cable protection tubes.

[0008] The dynamic submarine cable passes through the J-shaped cable protection tubes and bend limiters on both sides. A plurality of buoyancy blocks are sleeved on the dynamic submarine cable and located between the two bend limiters.

[0009] This application designs a bending configuration to cooperate with the dynamic submarine cable, and cooperates with accessories such as anchor bend limiters, J-shaped cable protection tubes and buoyancy blocks, so that the dynamic cable system can adapt to changes in the marine environment, such as waves, tides and currents, thereby improving the safety performance of the submarine cable; if the tension of the submarine cable is too large, the wet weight can be reduced by increasing the length of the submarine cable or adjusting the number of buoyancy blocks used. If the curvature of the submarine cable is too large, the length of the dynamic section of the submarine cable needs to be shortened, and the tension is increased and adjusted to meet the requirements.

[0010] As a further solution of the present invention: the dynamic submarine cable includes several PV conductors, wherein the several PV conductors include a phase-separation sheath and several cables arranged in the phase-separation sheath and water-blocking glue connecting them. The dynamic submarine cable is provided with an outer sheath from the outermost circle, and a bidirectional armor and an inner sheath are sequentially arranged on the inner side of the outer sheath, and an optical fiber unit is also provided inside the inner sheath.

[0011] As a further solution of the present invention: the top of the J-shaped cable protection tube is installed on the floating photovoltaic platform through armored anchoring, and a traction head is provided above the armored anchoring.

[0012] As a further solution of the present invention: a bend limiter connecting flange is provided on the top of the bend limiter, and is connected to the J-shaped cable protection tube through the bend limiter connecting flange.

[0013] As a further solution of the present invention: a limiter is installed at the other end of the bend limiter.

[0014] As a further solution of the present invention: the dynamic submarine cable adopts insulating material, which can specifically be polyethylene material, cross-linked polyethylene material or EPDM rubber material.

[0015] Compared with the prior art, the beneficial effects of the present invention are:

[0016] 1. This application utilizes a design that combines a curved configuration with a dynamic submarine cable, along with accessories such as anchor bend limiters, J-shaped cable protection tubes, and buoyancy blocks, to enable the dynamic cable system to adapt to changes in the marine environment, such as waves, tides, and currents, thereby improving the safety of the submarine cable. If the cable tension is too high, the wet weight can be reduced by increasing the cable length or adjusting the number of buoyancy blocks used. If the cable curvature is too large, the length of the dynamic section of the cable needs to be shortened while increasing the tension to meet the requirements.

[0017] 2. This application fully considers the capacity of the floating photovoltaic power generation platform and specifically selects multiple suitable PV conductors. Compared with traditional three-core submarine cables, this significantly reduces cable stiffness and improves cable fatigue resistance, making it more suitable for use in dynamic marine environments and effectively reducing cable cost and weight.

[0018] 3. This application aims to select DC or AC boost mode according to the transmission distance, thereby reducing line loss during transmission. The AC boost mode can also reduce the cable cross-section and reduce the use of copper materials. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 This is a cross-sectional view of a dynamic submarine cable according to an embodiment of the present utility model;

[0020] Figure 2 This is a structural diagram of a dynamic submarine cable system for multiple platforms according to an embodiment of the present utility model;

[0021] Explanation of the accompanying symbols: 1. PV conductor; 2. Water-blocking adhesive; 3. Phase-splitting sheath; 4. Optical fiber unit; 5. Inner sheath; 6. Bidirectional armor; 7. Outer sheath; 8. Towing head; 9. Bend limiter connecting flange; 10. Dynamic submarine cable; 11. Floating photovoltaic platform; 12. Armor anchoring; 13. J-shaped cable protection tube; 14. Bend limiter; 15. Buoyancy block; 16. Limiter. DETAILED DESCRIPTION

[0022] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention. Obviously, the embodiments described are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0023] Reference Figure 1 and Figure 2 A dynamic submarine cable system for multiple platforms includes a dynamic submarine cable 10, an armored anchor 12, a bend limiter 14, a J-shaped cable protection tube 13, a buoyancy block 15, and a floating photovoltaic platform 11 and a wind turbine tower installed on the sea level. Two groups of J-shaped cable protection tubes 13 are respectively installed on the floating photovoltaic platform 11 and the wind turbine tower. Bend limiters 14 are provided at the bottom of the J-shaped cable protection tubes 13; the dynamic submarine cable 10 passes through the J-shaped cable protection tubes 13 and the bend limiters 14 on both sides, and a plurality of buoyancy blocks 15 are further provided on the dynamic submarine cable 10 and between the two bend limiters 14; the dynamic submarine cable 10 uses an insulating material, which can specifically be made of polyethylene material, cross-linked polyethylene material, or EPDM rubber material.

[0024] Furthermore, the top of the J-shaped cable protection tube 13 is installed on the floating photovoltaic platform 11 through the armor anchor 12 , and a traction head 8 is provided above the armor anchor 12 .

[0025] Furthermore, a bend limiter connecting flange 9 is provided on the top of the bend limiter 14 and is connected to the J-shaped cable protection tube 13 through the bend limiter connecting flange 9; a limiter 16 is installed at the other end of the bend limiter 14.

[0026] Reference Figure 1 The dynamic submarine cable 10 includes several PV conductors 1, wherein the several PV conductors 1 include a phase-separation sheath 3 and several cables arranged in the phase-separation sheath 3 and a water-blocking glue 2 connecting them. The dynamic submarine cable 10 is provided with an outer sheath 7 from the outermost circle, and a bidirectional armor 6 and an inner sheath 5 are arranged in sequence inside the outer sheath 7. An optical fiber unit 4 is also provided inside the inner sheath 5.

[0027] The specific operating principles of this application are as follows:

[0028] Calculate the conductor structure and quantity of the submarine cable 10, operating voltage, etc. according to the capacity of the floating photovoltaic platform 11, and design a suitable submarine cable structure;

[0029] The curved configuration is designed based on the hydrological report of the water area where the floating photovoltaic system (installed on a floating photovoltaic platform) will be deployed and the six-degree-of-freedom motion parameters of the platform;

[0030] According to the bending configuration, the corresponding armored anchor 12, bend limiter 14, buoyancy block 15 and other accessories are designed to alleviate the dynamic cable curvature and tension caused by cable weight, water depth change and photovoltaic foundation drift, and prevent the cable from being damaged by bending or stretching.

[0031] The capacity of floating photovoltaic panel strings is smaller than that of offshore wind turbines, mainly between 0.5 and 1MW. It is advisable to use DC or AC conductors with a nominal cross-section of 2.5 to 6 square meters (AC conductors can be used to increase the voltage for transmission and reduce the nominal cross-section by one level. For example, if DC uses 4 square meters, the corresponding AC can use 2.5 square meters). The voltage level is 1 to 3kV. The use of a low-voltage transmission system reduces the use of shielding copper materials, which is more suitable for the low capacity and low cost requirements of floating photovoltaic systems.

[0032] For short-distance power transmission, a DC method can be used, that is, each photovoltaic panel uses two PV DC lines. For long-distance power transmission, a boosted AC method is used, and each photovoltaic panel requires three PV AC lines to reduce DC transmission losses.

[0033] Preferably or optionally, the number of PV conductors used for the AC / DC cable (dynamic submarine cable 10) is calculated as follows: assuming the number of photovoltaic panels used on the platform is k and the DC transmission mode is adopted, the minimum number of PV conductors required is 2k;

[0034] Preferably or optionally, the number of PV conductors used in the AC / DC cable (dynamic submarine cable 10) is calculated as follows: if the PV platform has a long transmission distance, in order to reduce transmission line losses, an inverter booster is installed after the PV platform collects power, and an AC transmission mode is adopted. Assuming the number of PV panels used on the platform is k, the minimum number of PV conductors required is 3k;

[0035] Preferably or optionally, the AC / DC cable (dynamic submarine cable 10) uses a large number of PV conductors. To avoid wiring errors during construction and facilitate subsequent maintenance, each group of PV conductors can be color-coded and numbered. For example, a DC system can use red and black colors, with line numbers 1 to k; an AC system can use red, blue, and yellow colors, with line numbers 1 to k.

[0036] Preferably or optionally, the number of PV conductors used in the AC / DC cable (dynamic submarine cable 10) is matched according to the actual power generation capacity of the floating photovoltaic panel, which reduces the weight and cost of the submarine cable. At the same time, compared with the traditional three-core submarine cable, it is more flexible and improves the fatigue resistance of the cable body, making it more suitable for common use in dynamic sea areas.

[0037] Preferably or optionally, the insulation of the AC / DC cable (dynamic submarine cable 10 ) may be made of polyethylene PE, cross-linked polyethylene XLPE, or ethylene propylene diene monomer rubber EPR.

[0038] Preferably or optionally, the AC / DC cable (dynamic submarine cable 10) adopts a waterproofing method of two-component glue or polyurethane drip irrigation, which is more reliable under dynamic fatigue conditions than the traditional water-blocking tape method.

[0039] Preferably or optionally, the bending configuration and accessory design includes the following steps:

[0040] According to the water depth and the horizontal drift of the floating foundation, a static bending configuration is designed. The left and right connecting sections are fixed with anchors 12 to the armor. For shallow water areas, the bending configuration can adopt a double waveform or a triple waveform (i.e., a waveform segment formed by two buoyancy blocks 15). This application is a double waveform (refer to Figure 2 ), the horizontal distance of the linear area (i.e. the two ends of the waveform) is 2 to 4 times the water depth, leaving enough margin, and the top and bottom of the waveform must meet the requirement of being greater than 1 / 4 of the water depth to alleviate the dynamic cable curvature and tension caused by water depth changes and foundation drift, and to avoid the impact of passing ships on the cable.

[0041] Add extreme working conditions to the static bending configuration and re-evaluate whether the dynamic cable curvature and tension meet the requirements. If the curvature is too large, shorten the length of the dynamic section of the submarine cable and increase the tension at the same time to adjust it to meet the requirements. If the tension is too large, reduce the wet weight by increasing the length or adjusting the number of buoyancy blocks used.

[0042] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit the same. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that the technical solutions described in the aforementioned embodiments can still be modified, or some of the technical features thereof can be replaced by equivalents. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A dynamic submarine cable system for multiple platforms, comprising a dynamic submarine cable (10), characterized in that: The invention also includes a bend limiter (14), a J-shaped cable protection tube (13), a buoyancy block (15), and a floating photovoltaic platform (11) and a wind turbine tower installed on the sea level. The J-shaped cable protection tube (13) is provided with two groups, which are installed on the floating photovoltaic platform (11) and the wind turbine tower respectively. A bend limiter (14) is provided at the bottom of the J-shaped cable protection tube (13). The dynamic submarine cable (10) passes through the J-shaped cable protection tube (13) and the bend limiter (14) on both sides. A plurality of buoyancy blocks (15) are sleeved on the dynamic submarine cable (10) and located between the two bend limiters (14).

2. The multi-platform dynamic submarine cable system according to claim 1, characterized in that: The dynamic submarine cable (10) includes a plurality of PV conductors (1) therein, wherein the plurality of PV conductors (1) include a phase-splitting sheath (3) and a plurality of cables arranged in the phase-splitting sheath (3) and a water-blocking glue (2) connecting the cables. The dynamic submarine cable (10) is provided with an outer sheath (7) from the outermost circle, and a bidirectional armor (6) and an inner sheath (5) are sequentially provided inside the outer sheath (7), and an optical fiber unit (4) is also provided inside the inner sheath (5).

3. The multi-platform dynamic submarine cable system according to claim 1, characterized in that: The top of the J-shaped cable protection tube (13) is installed on the floating photovoltaic platform (11) through an armored anchor (12), and a traction head (8) is arranged above the armored anchor (12).

4. The multi-platform dynamic submarine cable system according to claim 1, characterized in that: A bend limiter connecting flange (9) is provided on the top of the bend limiter (14), and is connected to the J-shaped cable protection tube (13) via the bend limiter connecting flange (9).

5. The multi-platform dynamic submarine cable system according to claim 4, characterized in that: A stopper (16) is installed at the other end of the bend limiter (14).

6. The multi-platform dynamic submarine cable system according to claim 1, characterized in that: The dynamic submarine cable (10) is made of insulating material, which can specifically be polyethylene material, cross-linked polyethylene material or EPDM rubber material.

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