CN-121088564-B - Variable cross-section cable and air assembly suitable for high-altitude wind power generation

Abstract

The invention relates to the technical field of high-altitude wind power generation, in particular to a variable cross-section cable and an air assembly suitable for high-altitude wind power generation. The variable cross-section cable comprises at least one variable cross-section unit, each variable cross-section unit comprises a first cable, a first transition section and a second cable which are sequentially connected, the first cable and the second cable are cylindrical, the diameter of the cross section of the first cable is larger than that of the cross section of the second cable, the first cable in the same variable cross-section unit is positioned below the second cable, a driver suitable for high-altitude wind power generation can move on the first cable and the second cable, and the driver is connected with an umbrella body and is used for driving the umbrella body to open or close. The weight of the mooring rope can be effectively reduced by the technical scheme.

Inventors

• LUO BIXIONG
• Duan Dexuan
• LIU YIPING
• ZHANG LI
• PENG KAIJUN
• REN ZONGDONG
• SUN YING
• HUO SHAOLEI
• SUN YANQIAN
• Yang wolong
• LIU HAIYANG

Assignees

• 中国电力工程顾问集团有限公司
• 中能建(北京)高空能源科技有限公司
• 中能建(阿拉善盟)高空能源科技有限公司

Dates

Publication Date

20260508

Application Date

20250930

Claims (4)

1. 1. The variable cross-section cable is characterized by comprising at least one variable cross-section unit, wherein each variable cross-section unit comprises a first cable, a first transition section and a second cable which are sequentially connected, the first cable and the second cable are cylindrical, the diameter of the cross section of the first cable is larger than that of the cross section of the second cable, the first cable in the same variable cross-section unit is positioned below the second cable, a driver suitable for high-altitude wind power generation can move on the first cable and the second cable, and the driver is connected with an umbrella body and is used for driving the umbrella body to be opened or closed; The diameter of the first cable cross section is equal to the maximum diameter of the first transition section cross section, and the diameter of the second cable cross section is equal to the minimum diameter of the first transition section cross section; A second transition section is connected between two adjacent variable cross-section units, and a second cable of the former variable cross-section unit is connected with a first cable of the latter variable cross-section unit through the second transition section; The diameter of the second cable cross section of the former variable-section unit is equal to the maximum diameter of the second transition section cross section, and the diameter of the first cable cross section of the latter variable-section unit is equal to the minimum diameter of the second transition section cross section; The length of the first transition section and the second transition section are related to the difference in cross-sectional diameters of the first cable and the second cable to which they are connected; the cross-sectional diameters of the first cable and the second cable are determined by the following formula: wherein d n is the cross-sectional diameter of the nth cable in a cylindrical shape in the arrangement sequence from top to bottom, C 1 is a first preset coefficient related to the strength of the cable material, S is a preset safety coefficient, T i is the maximum tensile force of the ith cable in the cylindrical shape in the arrangement sequence from top to bottom, ρ is the air density, C t is a second preset coefficient related to the structural parameters of the umbrella body, the structural parameters comprise appearance, air permeability, air density, reynolds number, wind direction and included angle of the cable and the horizontal line, A i is the nominal area of the ith umbrella body, V i,w is the wind speed at the height of the ith umbrella body, β is the included angle of the cable and the horizontal line, and V R is the cable speed; optical fiber sensors are arranged in the first transition section and the second transition section, the optical fiber sensors are used for monitoring the strain and the temperature of a cable, the optical fiber sensors are electrically connected with an external controller, and the controller is used for executing the following operations: Acquiring monitoring data of all transition sections at the current time, wherein the monitoring data comprise wind speed, strain, temperature, diameter, speed of a cable, an included angle with a horizontal line, a creep coefficient and fatigue parameters; Inputting the monitoring data into a pre-trained stress prediction model, and outputting to obtain a stress prediction trend corresponding to each transition section, wherein the stress prediction model is obtained based on LSTM model training; and determining a rope winding strategy of the mooring rope based on the stress prediction trend and the tension of the umbrella body.
2. 2. A variable cross-section cable according to claim 1, wherein the first transition section and the second transition section are formed by any one of braiding, fixing and sleeve fixing.
3. 3. The variable cross-section cable of claim 2, wherein braiding, securing and shaping comprises disassembling the cable ends of small cross-sectional diameter and braiding the disassembled fiber bundles back into the cable body of large cross-sectional diameter; The sleeve is fixedly formed by fixing two ends of the sleeve to the end parts of a first cable and a second cable connected with the sleeve respectively, wherein the sleeve is made of carbon fiber reinforced titanium alloy composite materials.
4. 4. An aerial assembly suitable for use in a high altitude wind power generation system comprising a cable, an umbrella and a flotation device disposed on the cable, the cable being a variable cross-section cable as claimed in any one of claims 1 to 3.

Description

Variable cross-section cable and air assembly suitable for high-altitude wind power generation Technical Field The invention relates to the technical field of high-altitude wind power generation, in particular to a variable cross-section cable and an air assembly suitable for high-altitude wind power generation. Background The high altitude wind energy is a new energy source which is just researched and utilized by human beings, and researches indicate that the wind energy stored in the high altitude exceeds 100 times of the total energy required by the human society, so that the high altitude wind power generation technology is a development trend of future wind power generation. In the related art, an aerial assembly suitable for high-altitude wind power generation generally comprises a cable, an umbrella body (such as a work umbrella, a balance umbrella and the like) and a floating device (such as a helium balloon, an airship and the like) which are arranged on the cable. However, the inventor has found during the development that the aerial components of the related art often have a problem of excessive weight, and the weight of the cable may even exceed 50% of the weight of the aerial components, which clearly greatly restricts the power generation efficiency of the aerial wind power generation system. Therefore, there is a need to provide a variable cross-section cable and air assembly suitable for high altitude wind power generation to solve the above-mentioned problems. Disclosure of Invention The embodiment of the invention provides a variable cross-section cable and an air assembly suitable for high-altitude wind power generation, which can effectively reduce the weight of the cable. In a first aspect, an embodiment of the present invention provides a variable cross-section cable suitable for high-altitude wind power generation, including at least one variable cross-section unit, where each variable cross-section unit includes a first cable, a first transition section, and a second cable that are sequentially connected, where the first cable and the second cable are both cylindrical, a diameter of a cross section of the first cable is greater than a diameter of a cross section of the second cable, a first cable in the same variable cross-section unit is located below the second cable, and a driver suitable for high-altitude wind power generation can move on the first cable and the second cable, and the driver is connected to an umbrella body and is used to drive the umbrella body to open or close. In one embodiment, the diameter of the first cable cross section is equal to the maximum diameter of the first transition section cross section and the diameter of the second cable cross section is equal to the minimum diameter of the first transition section cross section. In one embodiment, the variable cross-section units are multiple, a second transition section is connected between two adjacent variable cross-section units, and the second cable of the previous variable cross-section unit is connected with the first cable of the next variable cross-section unit through the second transition section. In one embodiment, the diameter of the second cable cross section of the former variable cross section unit is equal to the maximum diameter of said second transition section cross section and the diameter of the first cable cross section of the latter variable cross section unit is equal to the minimum diameter of said second transition section cross section. In one embodiment, the first transition section and the second transition section are formed by weaving, fixing and forming and sleeve fixing. In one embodiment, braiding, securing and shaping includes disassembling cable ends of small cross-sectional diameter and braiding the disassembled fiber bundles back into the interior of cable body of large cross-sectional diameter; The sleeve is fixedly formed by fixing two ends of the sleeve to the end parts of a first cable and a second cable connected with the sleeve respectively, wherein the sleeve is made of carbon fiber reinforced titanium alloy composite materials. In one embodiment, the length of each of the first and second transition sections is related to the difference in cross-sectional diameters of the first and second cables to which it is connected. In one embodiment, the cross-sectional diameters of the first cable and the second cable are determined by the following formula: Wherein d n is the cross-sectional diameter of the nth cable in a cylindrical shape in the order of the arrangement from top to bottom, C 1 is a first preset coefficient related to the strength of the cable material, S is a preset safety coefficient, T i is the maximum tensile force of the ith cable in a cylindrical shape in the order of the arrangement from top to bottom, ρ is the air density, C t is a second preset coefficient related to the structural parameters of the umbrella body, including the shape, the air per