Composite cable and high-altitude power generation platform

Abstract

The invention relates to the technical field of new energy, and provides a composite cable and a high-altitude power generation platform. The composite cable comprises an outer protective layer, an inner protective layer, and a conductive unit, a gas circuit unit and an optical fiber unit which are arranged at the inner side of the inner protective layer, and the cross section of the composite cable is streamline-shaped. The cross section of the composite cable is streamline-shaped, and compared with a composite cable with a circular cross section in the prior art, the wind resistance of the composite cable is reduced. The resistance coefficient of the streamline shape is reduced in number level compared with that of a circular shape, at least part of the conductive units, the gas circuit units and the optical fiber units are linearly arranged, the section thickness is smaller than that of the composite cable with the circular section, and wind resistance is further reduced. In addition, after airflow flows through the maximum diameter of the composite cable with the circular section, eddy current can occur, and vortex-induced vibration is caused, and the composite cable in the embodiment of the invention has the streamline-shaped section, so that the airflow is more stable, laminar flow is formed, the vortex-induced vibration is effectively reduced, the stability of the composite cable is improved, and the safety of the high-altitude power generation platform is enhanced.

Description

Technical Field

[0001] The present invention relates to the field of new energy technologies, and particularly to a composite cable and an airborne power generation platform. Background Art

[0002] With the continuous growth of the global demand for clean energy, wind power generation and solar power generation technologies have developed rapidly. There are currently two main forms of airborne wind power generation: one is to use a tethered drone or aerostat to carry a generator set to high altitude for power generation, and the electric energy is transmitted to the ground through a tether cable. The other is to use an airborne wind energy capture device to convert wind energy into mechanical energy to drive a ground generator set for power generation. A space solar power station is a large-scale space power station operating in the geosynchronous orbit, which generates electricity in space and transmits the electric energy to the ground.

[0003] In an airborne tethered power generation aerostat platform, due to the need for high-power electric energy transmission, the wires and insulating layers inside the tether cable are relatively thick. At the same time, in order to achieve long-term hovering of the aerostat, it is usually necessary to add an air path in the tether cable for air replenishment, which further increases the diameter of the tether cable. The length of the tether cable of an ultra-high altitude tethered aerostat usually reaches more than ten to more than twenty kilometers, and it needs to pass through strong wind areas, resulting in a very large total wind resistance on the cable, seriously threatening the safety of the system. Summary of the Invention

[0004] The present invention provides a composite cable and an airborne power generation platform to solve the problems of the thick diameter, large wind resistance, and low safety of the tether cable of an ultra-high altitude tethered aerostat in the prior art.

[0005] The present invention provides a composite cable, including: an outer protective layer, an inner protective layer, and a conductive unit, an air path unit, and an optical fiber unit arranged inside the inner protective layer. The cross-section of the composite cable is streamlined.

[0006] According to the composite cable provided by the present invention, the cross-sectional area of the composite cable gradually decreases from the center to both ends.

[0007] According to the composite cable provided by the present invention, the cross-section of the composite cable is a symmetric structure.

[0008] According to the composite cable provided by the present invention, there are multiple conductive units, and the multiple conductive units, the air path unit, and the optical fiber unit are linearly arranged in a direction perpendicular to the axis of the composite cable, and adjacent two conductive units are spaced apart.

[0009] According to the composite cable provided by the present invention, it further includes a load-bearing unit, and at least one load-bearing unit is provided between at least one of the conductive unit and the air path unit, between the air path unit and the optical fiber unit, and between the conductive unit and the optical fiber unit.

[0010] According to a composite cable provided by the present invention, the conductive unit includes a first conductive unit, a second conductive unit, and a third conductive unit, and the load-bearing unit includes a first load-bearing unit and a second load-bearing unit; the first conductive unit, the first load-bearing unit, the gas path unit, the second conductive unit, the second load-bearing unit, the third conductive unit, and the optical fiber unit are arranged in sequence along a direction perpendicular to the axis of the composite cable.

[0011] According to a composite cable provided by the present invention, it further includes a filling unit, and the filling unit is filled between any two adjacent ones of the conductive unit, the gas path unit, and the optical fiber unit.

[0012] The present invention also provides an aerial power generation platform, which includes the composite cable as described in any one of the above, and further includes an aerostat, a power generation device, and a first fixing device. The aerostat is connected to the first end of the composite cable, and the second end of the composite cable is connected to the first fixing device; the power generation device is connected to the composite cable.

[0013] According to an aerial power generation platform provided by the present invention, it further includes a connector. There are multiple composite cables, and adjacent two composite cables are connected through the connector. Both the aerostat and the power generation device are connected to the adjacent composite cables through the connector.

[0014] According to an aerial power generation platform provided by the present invention, the power generation device includes a photovoltaic cell and a solar power station. The photovoltaic cell is arranged on the aerostat, and the solar power station is deployed in the geostationary orbit. The solar power station receives sunlight and transmits it to the photovoltaic cell through laser energy transmission.

[0015] According to an aerial power generation platform provided by the present invention, the power generation device includes a wind power generation device. The wind power generation device is arranged on the aerostat; or, the wind power generation device is arranged between the aerostat and the first fixing device, and both ends of the wind power generation device are respectively connected to the two composite cables through the connector.

[0016] According to an aerial power generation platform provided by the present invention, it further includes a first winch and a cable. The first winch is fixed to the first fixing device, and the cable is wound around the first winch and then connected to the composite cable.

[0017] An aerial power generation platform provided by the present invention further includes an auxiliary cable, a cutter, a suspension member, and a second fixing device. A second winch is provided on the second fixing device. The auxiliary cable is wound around the second winch and then connected to the aerostat. Both the suspension member and the cutter are arranged at one end of the auxiliary cable close to the aerostat. The cutter is arranged between the suspension member and the aerostat. After the aerostat rises to the target height, the cutter cuts the auxiliary cable to disconnect the connection with the aerostat.

[0018] The composite cable and the aerial power generation platform provided by the present invention have a streamlined cross-section. Compared with the composite cable with a circular cross-section in the prior art, the wind resistance of the composite cable is reduced. The drag coefficient of the streamlined shape is reduced by an order of magnitude compared with that of the circular shape. Since at least part of the conductive unit, the gas path unit, and the optical fiber unit are linearly arranged, the cross-sectional thickness is smaller than that of the composite cable with a circular cross-section, further reducing the wind resistance. In addition, after the air flow passes through the maximum diameter of the composite cable with a circular cross-section, eddy currents will appear, causing vortex-induced vibration. The composite cable in the embodiment of the present invention has a streamlined cross-section, the air flow is more stable, forming a laminar flow, effectively reducing the vortex-induced vibration, improving the stability of the composite cable, and enhancing the safety of the aerial power generation platform. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, other drawings can be obtained based on these drawings without creative efforts.

[0020] Figure 1 is a schematic cross-sectional structure diagram of the composite cable provided by the present invention; Figure 2 is a schematic structural diagram of the aerial power generation platform according to Embodiment 1 provided by the present invention; Figure 3 is a schematic structural diagram of the aerial power generation platform according to Embodiment 2 provided by the present invention; Figure 4 is a schematic structural diagram of the aerial power generation platform according to Embodiment 3 provided by the present invention; Figure 5 is a schematic structural diagram of the installation process of the aerial power generation platform in Embodiment 3 provided by the present invention; Reference Signs: 10. Composite cable; 11. Outer protective layer; 12. Inner protective layer; 13. Conductive unit; 14. Gas path unit; 15. Optical fiber unit; 16. Filling unit; 17. Load-bearing unit; 20. First fixing device; 30. Connector; 40. Cable; 50. First winch; 61. Photovoltaic cell; 62. Wind power generation device; 621. Wind turbine; 622. Tower; 70. Aerostat; 80. Second fixing device; 90. Second winch; 100. Auxiliary cable. Detailed implementation manners

[0021] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without making creative efforts based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0022] In the description of the embodiments of the present invention, it should be noted that unless otherwise clearly defined and limited, the terms "connected" and "coupled" should be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or an integral connection; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0023] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationship indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the embodiments of the present invention.

[0024] In addition, the terms "first" and "second" are only used for descriptive purposes and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features. Thus, the features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present invention, "a plurality" means two or more unless otherwise specifically defined.

[0025] The embodiments of the present invention will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are intended to explain the present invention and should not be construed as a limitation to the present invention.

[0026] The following disclosure provides many different embodiments or examples for implementing different structures of the present invention. To simplify the disclosure of the present invention, the components and settings of specific examples are described below. Of course, they are only examples and are not intended to limit the present invention. In addition, the present invention may repeat reference numerals and / or letters in different examples. Such repetition is for the purpose of simplicity and clarity and does not itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present invention provides examples of various specific processes and materials, but those of ordinary skill in the art can recognize the applicability of other processes and / or the use of other materials.

[0027] The following will describe the composite cable and the high-altitude power generation platform of the present invention in conjunction with Figures 1 - 5 Describe the composite cable and the high-altitude power generation platform of the present invention.

[0028] The composite cable 10 provided by the embodiment of the present invention includes an outer sheath 11, an inner sheath 12, a conductive unit 13, a gas path unit 14, and an optical fiber unit 15. The outer sheath 11 is provided on the outer side of the inner sheath 12, and the conductive unit 13, the gas path unit 14, and the optical fiber unit 15 are provided on the inner side of the inner sheath 12. The outer sheath 11 can be made of a low-density polyethylene and an iodine-doped semiconductor material to maintain the structural stability of the composite cable 10; the outer sheath 11 can achieve ground protection to ensure safety; the outer sheath 11 can also shield external electromagnetic interference; it can also effectively release static electricity and discharge lightning, improving the lightning resistance of the composite cable 10. The inner sheath 12 can be a copper mesh braided layer to enhance the mechanical strength and electromagnetic shielding performance of the composite cable 10. The conductive unit 13 is used to transmit electric energy. The gas path unit 14 is used to supply air to the aerostat 70 to maintain the hovering time of the aerostat 70. The optical fiber unit 15 is used for data transmission or communication.

[0029] In the embodiment of the present invention, the cross-section of the composite cable 10 is arranged in a streamline shape. Specifically, the conductive unit 13, the gas path unit 14, and the optical fiber unit 15 are arranged at intervals along the direction perpendicular to the axis of the composite cable 10. Since the cross-sectional areas of the conductive unit 13, the gas path unit 14, and the optical fiber unit 15 are different, the formed streamline structures are different. In one embodiment, there are multiple conductive units 13. When the cross-sectional areas of the conductive unit 13 and the optical fiber unit 15 are small, the optical fiber unit 15 is arranged adjacent to both the conductive unit 13 and the gas path unit 14. It should be noted that the arrangement methods of the conductive unit 13, the gas path unit 14, and the optical fiber unit 15 are not limited, as long as their cross-sections are in a streamline shape.

[0030] In the embodiment of the present invention, the cross-section of the composite cable 10 is streamlined, which reduces the wind resistance of the composite cable 10 compared with the composite cable 10 with a circular cross-section in the prior art. The streamline shape has a reduction in the drag coefficient at the order of magnitude compared with the circular shape. Since at least part of the conductive unit 13, the gas path unit 14, and the optical fiber unit 15 are linearly arranged, the cross-section thickness is smaller than that of the composite cable 10 with a circular cross-section, further reducing the wind resistance. In addition, after the air flow passes through the maximum diameter of the composite cable 10 with a circular cross-section, eddy currents will appear, causing vortex-induced oscillations. The composite cable 10 in the embodiment of the present invention has a streamlined cross-section, the air flow is more stable, forming a laminar flow, effectively reducing the vortex-induced vibration, improving the stability of the composite cable 10, and enhancing the safety of the high-altitude power generation platform.

[0031] As Figure 1 shown, the cross-sectional area of the composite cable 10 in the embodiment of the present invention gradually decreases from the center to both ends.

[0032] In one embodiment, the cross-section of the composite cable 10 is a symmetric structure. The cross-sectional area of the composite cable 10 gradually decreases from the center to both ends, and the decreasing trend is the same, forming a symmetric structure, which has small resistance and high safety. It should be noted that the size of the cross-sectional area can be adjusted by the filling unit 16 to meet the design requirements.

[0033] In another embodiment, the cross-sectional area of the composite cable 10 gradually decreases from the center to both ends, and the decreasing trend is different, which can be set according to the cross-sectional dimensions of the conductive unit 13, the gas path unit 14, and the optical fiber unit 15.

[0034] There may be multiple conductive units 13 in the embodiment of the present invention. Multiple conductive units 13, gas path units 14, and optical fiber units 15 are linearly arranged along the direction perpendicular to the axis of the composite cable 10. It should be noted that adjacent two conductive units 13 are spaced apart to avoid problems such as electrical breakdown due to the thin air at high altitudes.

[0035] In one embodiment, there are 3 conductive units 13, namely the first conductive unit, the second conductive unit, and the third conductive unit. The first conductive unit, the gas path unit 14, the second conductive unit, the optical fiber unit 15, and the third conductive unit are linearly arranged along the direction perpendicular to the axis of the composite cable 10. It should be noted that the filling unit 16 is filled between adjacent two of the first conductive unit, the gas path unit 14, the second conductive unit, the optical fiber unit 15, and the third conductive unit, and the filling unit 16 is also filled between the first conductive unit, the gas path unit 14, the second conductive unit, the optical fiber unit 15, the third conductive unit and the inner sheath 12, and the stability is good. The filled unit includes aerogel.

[0036] In the embodiments of the present invention, there may be multiple optical fiber units 15. In one embodiment, there are two optical fiber units 15, namely a first optical fiber unit and a second optical fiber unit. The first conductive unit, the gas path unit 14, the second conductive unit, the first optical fiber unit, and the third conductive unit are arranged in sequence along a direction perpendicular to the axis of the composite cable 10. The second optical fiber unit may be arranged between the first optical fiber unit and the second conductive unit, or between the first optical fiber unit and the third conductive unit, or between the first conductive unit and the gas path unit 14. In one embodiment, the second optical fiber unit may also be arranged adjacent to at least three of the first conductive unit, the gas path unit 14, the second conductive unit, the first optical fiber unit, and the third conductive unit.

[0037] The composite cable 10 in the embodiments of the present invention further includes a load-bearing unit 17, and the load-bearing unit 17 is used to enhance the performance of the composite cable 10. The load-bearing unit 17 may be an ultra-thin sheath aramid fiber cable.

[0038] In one embodiment, at least one load-bearing unit 17 is arranged between the conductive unit 13 and the gas path unit 14. In another embodiment, at least one load-bearing unit 17 is arranged between the gas path unit 14 and the optical fiber unit 15. In yet another embodiment, at least one load-bearing unit 17 is arranged between the conductive unit 13 and the optical fiber unit 15. In yet another embodiment, at least one load-bearing unit 17 is arranged between the conductive unit 13 and the gas path unit 14, between the gas path unit 14 and the optical fiber unit 15, and between the conductive unit 13 and the optical fiber unit 15.

[0039] There are three conductive units 13 in the embodiments of the present invention, namely a first conductive unit, a second conductive unit, and a third conductive unit, and there are two load-bearing units 17, namely a first load-bearing unit and a second load-bearing unit. As Figure 1 shown, the first conductive unit, the first load-bearing unit, the gas path unit 14, the second conductive unit, the second load-bearing unit, the third conductive unit, and the optical fiber unit 15 are arranged in sequence along a direction perpendicular to the axis of the composite cable 10. It can be understood that units with a smaller diameter can be arranged side by side with other units. For example, the optical fiber unit 15 has a smaller diameter and can be arranged in the area formed by the conductive unit 13, the load-bearing unit 17, and the inner sheath 12, or in the area formed between the conductive unit 13, the gas path unit 14, and the inner sheath 12. In the embodiments of the present invention, the arrangement positions of the respective units are not specifically limited, and a streamlined cross-section can be formed, and the adjacent two conductive units 13 are arranged at intervals.

[0040] The composite cable 10 further includes a filling unit 16. The filling unit 16 is filled between any two adjacent ones of the conductive unit 13, the gas path unit 14, the optical fiber unit 15, and the load-bearing unit 17. The filling unit 16 is also filled between the conductive unit 13, the gas path unit 14, the optical fiber unit 15, the load-bearing unit 17 and the inner sheath 12 to enhance the structural stability. The filling unit 16 includes aerogel.

[0041] An embodiment of the present invention further provides an airborne power generation platform, which includes the composite cable 10 in any of the above embodiments, and further includes an aerostat 70, a power generation device, and a first fixing device 20. The aerostat 70 is connected to the first end of the composite cable 10, the second end of the composite cable 10 is connected to the first fixing device 20, and the power generation device is connected to the composite cable 10.

[0042] The aerostat 70 is connected to the first end of the composite cable 10 and is used to lift the power generation device to a high altitude to utilize high-altitude wind energy or solar energy resources. The aerostat 70 can be a tethered drone, a balloon, or other lightweight aircraft, and has the ability to stay in the air for a long time. It should be noted that the connection between the aerostat 70 and the first end of the composite cable 10 includes both mechanical connection and gas path connection to supply air to the aerostat 70 and extend the stay time in the air. The aerostat 70 can be directly provided on the aerostat 70 or fixed on the composite cable 10 to achieve fixation. The power generation device is electrically connected to the composite cable 10 and is used to convert high-altitude wind energy or solar energy into electrical energy. The power generation device includes a wind power generation device 62, a photovoltaic cell 61, or other energy conversion devices, and the specific form is selected according to the application scenario. The first fixing device 20 is connected to the second end of the composite cable 10 and is used to fix the composite cable 10 to the ground or other stable structures to ensure the stability of the airborne power generation platform. The first fixing device 20 can be a ground anchoring device, a tower 622, or other fixing structures.

[0043] During the actual operation process, the aerostat 70 carries the power generation device to ascend to a predetermined height, and the gas path unit 14 in the composite cable 10 extends the stay time of the aerostat 70 through the air supply position. The power generation device uses high-altitude wind energy or solar energy to generate electricity, and the electrical energy generated by the power generation device is transmitted to the ground equipment through the conductive unit 13 in the composite cable 10. The optical fiber unit 15 is used to transmit control signals and monitoring data to achieve remote monitoring and management.

[0044] The airborne power generation platform provided by the embodiment of the present invention realizes the efficient utilization of high-altitude wind energy or solar energy through the coordinated work of the composite cable 10, the aerostat 70, the power generation device, and the first fixing device 20. The streamlined cross-sectional design and multi-functional integration of the composite cable 10 significantly reduce wind resistance, improve the stability and safety of the system, and are applicable to clean energy fields such as high-altitude wind power generation and space solar power stations.

[0045] The high-altitude power generation platform further includes a connector 30. There are multiple composite cables 10, and two adjacent composite cables 10 are connected by the connector 30, which is convenient for installation, maintenance, and expansion. It should be noted that the connector 30 does not affect the continuity and reliability of electrical, gas path, and optical fiber connections. The aerostat 70, the power generation device, and the first fixing device 20 are all connected to the adjacent composite cable 10 through the connector 30. The connector 30 can withstand the loads exerted by the composite cable 10 and the external environment, achieve mechanical fixation and functional connection, and ensure the integrity and stability of the system. The connector 30 includes a rotating connector with sufficient axial bearing capacity. The rotating connector allows the composite cable 10 to adjust the direction of the composite cable 10 based on the wind direction, reducing wind resistance and vortex-induced vibration, and improving the adaptability and stability of the system. The aerostat 70 and the power generation device can also be connected to the adjacent composite cable 10 through the connector 30, which is convenient for installation and enhances its stability.

[0046] The high-altitude power generation platform further includes a first winch 50 and a cable 40. The first winch 50 is fixed to the first fixing device 20 and is used for winding the cable 40. The cross-section of the cable 40 is circular, and its internal structure is the same as that of the composite cable 10, at least including a conductive unit 13, an optical fiber unit 15, and a gas path unit 14. It may also include a load-bearing unit 17 and / or a filling unit 16. The cable 40 can be connected to the composite cable 10 through the connector 30 without affecting the continuity and reliability of electrical, gas path, and optical fiber connections. After the cable 40 is wound around the first winch 50, it is connected to the composite cable 10, and the length of the composite cable 10 can be adjusted by rotating the first winch 50, thereby adjusting the height of the power generation device.

[0047] In the embodiment of the present invention, there are multiple composite cables 10, and two adjacent composite cables 10 are connected by the connector 30 to adapt to working conditions with large wind direction differences at different heights. The connector 30 can be an optical, electrical, and gas combined slip ring. The connection section with the ground is a conventional circular cable 40. The circular cable 40 is wound on the first winch 50, and the cable 40 is retracted and released through the winch to adjust the entire working height.

[0048] In one embodiment, the power generation device includes a photovoltaic cell 61 and a solar power station. As Figure 4 shown, the aerostat 70 operates in the weak wind layer at an altitude of 20 km. The photovoltaic cell 61 is provided on the aerostat 70, such as the upper part of the aerostat 70 is paved with the photovoltaic cell 61. The solar power station is deployed in the geosynchronous orbit. The space solar power station is a large synchronous satellite operating in the geosynchronous orbit. The satellite includes a large number of solar panels. The solar panels can receive sunlight and transmit it to the photovoltaic cell 61 through laser energy transmission. The photovoltaic cell 61 is transmitted to the ground through the composite cable 10 and the cable 40. The main advantage compared with ground solar power generation is that the sunlight attenuation is small at this altitude, the solar power density is high, and importantly, it is not affected by clouds and the power generation is relatively stable.

[0049] In another embodiment, the power generation device includes a wind power generation device 62. As Figure 2 shown, in a high-wind area where the height of the aerostat 70 is 7 - 12 kilometers, the wind power generation device 62 is provided on the aerostat 70. The wind power generation device 62 includes a ducted fan and a conventional fan. As Figure 3 shown, the aerostat 70 is arranged in a light-wind area at a height of 20 km, and the wind power generation device 62 is arranged in a high-wind area at a height of 7 - 12 km. The wind power generation device 62 includes a tower 622 and a fan 621. Both ends of the tower 622 are respectively connected to two adjacent composite cables 10 through connectors 30. The fan 621 is installed on the tower 622 through a pan-tilt structure, and the fan 621 can be controlled to rotate and pitch relative to the pan-tilt structure through the pan-tilt structure. A wind speed and direction sensor is installed on the tower 622, and an attitude sensor is installed on the fan 621. The position of the fan 621 is adjusted by calculation.

[0050] As Figure 5 shown, the high-altitude power generation platform provided by the embodiment of the present invention further includes an auxiliary cable 100, a cutter, a suspension member, and a second fixing device 80. A second winch 90 is provided on the second fixing device 80. The auxiliary cable 100 is wound around the second winch 90 and then connected to the aerostat 70. Both the suspension member and the cutter are arranged at one end of the auxiliary cable 100 close to the aerostat 70 (not shown in the figure). The cutter is arranged between the suspension member and the aerostat 70. After the aerostat 70 rises to the target height, the cutter cuts the auxiliary cable 100 to disconnect the connection with the aerostat 70.

[0051] The high-altitude wind field is variable. For example, in the high-wind area (7 - 12 kilometers) in the Northern Hemisphere's mid-latitudes in summer, the maximum wind speed is 20 to 40 m / s, while in the high-wind area in winter, the wind speed can reach 40 - 60 m / s. Therefore, when the wind is light, the auxiliary cable 100 is used to achieve safe ascending height. During the actual operation process, a small-wind window is selected through wind field forecasting, a radiosonde balloon is released, and the wind speed and direction at different heights are measured. When the wind field meets the conditions, the ascending operation is carried out. As Figure 5As shown, an auxiliary cable 100 is wound around the second winch 90. One end of the first composite cable is connected to the aerostat 70 through the connector 30, and the other end of the first composite cable is connected to the cable 40 through the connector 30. The cable 40 is wound around the first winch 50. Control the second winch 90 to rotate to release the auxiliary cable 100. The first composite cable is released passively. After the first composite cable is completely released, pause the release of the auxiliary cable 100. Install the second composite cable between the cable 40 and the first composite cable through the connector 30. Repeat this cycle until the auxiliary cable is completely unloaded. Control the cutter to start and cut the auxiliary cable to disconnect the connection between the auxiliary cable 100 and the aerostat 70. Control the second winch 90 to rotate in the reverse direction, and the auxiliary cable 100 and the suspension member slowly fall to complete the installation. It should be noted that the buoyancy of the suspension member can help the auxiliary cable 100 to slowly descend, avoid direct dropping, and improve safety. Further, by rotating the first winch 50, release or tighten the cable 40 to further adjust the height of the aerostat 70 and the power generation device until the target height is reached, with high installation accuracy.

[0052] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features. However, such modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A composite cable, characterized in that: include: The composite cable comprises an outer protective layer, an inner protective layer, a conductive unit, an air path unit and an optical fiber unit arranged inside the inner protective layer, and the cross section of the composite cable is streamlined.

2. The composite cable according to claim 1, characterized in that The cross-sectional area of ​​the composite cable gradually decreases from the center to both ends.

3. The composite cable according to claim 1 or 2, characterized in that: The cross section of the composite cable is a symmetrical structure.

4. The composite cable according to claim 1, characterized in that: There are a plurality of conductive units, and the plurality of conductive units, the air path unit and the optical fiber unit are linearly arranged along a direction perpendicular to the axis of the composite cable, and two adjacent conductive units are spaced apart.

5. The composite cable according to claim 4, characterized in that: It also includes a load-bearing unit, and at least one of the load-bearing unit is provided between the conductive unit and the air circuit unit, between the air circuit unit and the optical fiber unit, and between the conductive unit and the optical fiber unit.

6. The composite cable according to claim 5, characterized in that: The conductive unit includes a first conductive unit, a second conductive unit and a third conductive unit, and the load-bearing unit includes a first load-bearing unit and a second load-bearing unit; The first conductive unit, the first load-bearing unit, the air path unit, the second conductive unit, the second load-bearing unit, the third conductive unit, and the optical fiber unit are sequentially arranged along a direction perpendicular to the axis of the composite cable.

7. The composite cable according to claim 1, characterized in that: It also includes a filling unit, and the filling unit is filled between any two adjacent ones of the conductive unit, the air path unit and the optical fiber unit.

8. A high altitude power generation platform, characterized in that: The composite cable comprises the composite cable as claimed in any one of claims 1 to 7, further comprising an airship, a power generation device and a first fixing device, wherein the airship is connected to the first end of the composite cable, the second end of the composite cable is connected to the first fixing device; and the power generation device is connected to the composite cable.

9. The high-altitude power generation platform according to claim 8, characterized in that: It also includes a connector, there are multiple composite cables, two adjacent composite cables are connected through the connector, and the aerostat and the power generation device are both connected to the adjacent composite cables through the connector.

10. The high altitude power generation platform according to claim 8, characterized in that: The power generation device includes a photovoltaic cell and a solar power station. The photovoltaic cell is arranged on the aerostat, and the solar power station is deployed in a geosynchronous orbit. The solar power station receives sunlight and transmits it to the photovoltaic cell through laser energy transmission.

11. The high-altitude power generation platform according to claim 9, characterized in that: The power generation device comprises a wind power generation device, and the wind power generation device is arranged on the aerostat; Alternatively, the wind power generation device is disposed between the airship and the first fixing device, and two ends of the wind power generation device are respectively connected to the two composite cables through the connectors.

12. The high-altitude power generation platform according to claim 8, characterized in that: It also includes a first winch and a cable. The first winch is fixed to the first fixing device. The cable is connected to the composite cable after being wound around the first winch.

13. The high altitude power generation platform according to claim 8, characterized in that: It also includes an auxiliary cable, a cutter, a suspension member and a second fixing device, wherein the second fixing device is provided with a second winch, and the auxiliary cable is connected to the airship after being wound around the second winch. The suspension member and the cutter are both provided at one end of the auxiliary cable close to the airship, and the cutter is provided between the suspension member and the airship. After the airship rises to a target height, the cutter cuts the auxiliary cable to disconnect from the airship.

Images