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CN-121990112-A - Tension leg floating type wind power foundation and installation method thereof

CN121990112ACN 121990112 ACN121990112 ACN 121990112ACN-121990112-A

Abstract

The invention discloses a tension leg floating type wind power foundation and an installation method thereof, and belongs to the technical field of offshore wind power. The wind power foundation floating body, the tension rib keys and the anchoring foundation are arranged, one end of each tension rib key is connected with the floating body, the other end of each tension rib key is correspondingly connected with the anchoring foundation to form a symmetrical mooring structure, the horizontal floating bodies are uniformly arranged around the middle upright posts in a radial mode at intervals and are fixedly connected with the middle upright posts, the middle upright posts are sequentially and fixedly connected from top to bottom through the upper upright posts, the jacket upright posts and the lower upright posts, and the whole structure design of the wind power foundation floating body has the advantages of considering stability and economy.

Inventors

  • HU HEWEN
  • LIU XIN
  • Zhou Dieming
  • CHEN JIANJUN
  • GUO XIAOHUI
  • LIU RUICHAO
  • BI CHENG
  • ZHU YABO
  • ZENG XIAOWEI

Assignees

  • 中国华能集团清洁能源技术研究院有限公司
  • 华能广东汕头海上风电有限责任公司
  • 华能(广东)能源开发有限公司
  • 华能海上风电科学技术研究有限公司

Dates

Publication Date
20260508
Application Date
20260324

Claims (10)

  1. 1. A tension leg floating type wind power foundation is characterized by comprising a floating body (1), tension rib keys (2) and an anchoring foundation (3), wherein the tension rib keys (2) are provided with a plurality of groups, one end of each group is connected with the floating body (1), the other end of each group is correspondingly connected with the anchoring foundation (3) to form a symmetrical mooring structure, the floating body (1) comprises a middle upright post and a plurality of horizontal buoys (101) arranged around the middle upright post, the plurality of horizontal buoys (101) are uniformly arranged around the middle upright post at intervals in a radiation mode and are fixedly connected with the middle upright post, the middle upright post is sequentially and fixedly connected with the middle upright post from top to bottom through an upper upright post (102), a jacket upright post (103) and a lower upright post (104), the jacket upright post (103) adopts a variable cross-section truss structure, the cross-section size of the connecting part of the upper part of the jacket upright post (103) is smaller than the cross-section size of the connecting part of the lower part and the lower upright post (104), and truss web bars are obliquely arranged in a staggered mode.
  2. 2. The tension leg floating wind power foundation according to claim 1, wherein the cross section of the horizontal pontoon (101) adopts a chamfer structure, the tension rib key (2) adopts a carbon fiber cable, and the anchoring foundation (3) adopts a suction anchor.
  3. 3. The tension leg floating wind power foundation according to claim 1, wherein a plurality of damping adjustment modules are detachably connected to truss web members of jacket stand columns (103), each damping adjustment module comprises an arc-shaped guide plate and a built-in adjustable damper, the concave surfaces of the arc-shaped guide plates face ocean water flow, an installation included angle of 15-25 degrees is formed between the arc-shaped guide plates and the truss web members, tension rib keys (2) are provided with tension monitoring units, the adjustable dampers are electrically connected with the tension monitoring units of the tension rib keys (2), and real-time tension changes of the tension rib keys (2) are given to dynamically adjust damping coefficients.
  4. 4. The tension leg floating wind power foundation according to claim 1, wherein the chamfering structure of the horizontal pontoon (101) is a gradual change structure, the chamfering angle near one end of the middle upright post is 30-45 degrees, the chamfering angle far from one end of the middle upright post is 15-30 degrees, and the surface of the horizontal pontoon (101) is sprayed with a low-friction corrosion-resistant coating.
  5. 5. The tension leg floating wind power foundation according to claim 1, wherein the connection parts of the tension rib key (2) and the floating body (1) and the anchoring foundation (3) are respectively provided with an adjustable universal joint, and a damping buffer component is arranged in each universal joint.
  6. 6. The tension leg floating wind power foundation according to claim 1, wherein a reinforced flange joint is arranged at the joint of the upper upright post (102) and the horizontal pontoon (101), an elastic sealing element is embedded in the flange joint, and at least 8 high-strength anti-corrosion bolts are uniformly distributed in the circumferential direction of the flange.
  7. 7. The tension leg floating wind power foundation according to claim 1, wherein the suction anchor of the anchoring foundation (3) adopts a double-layer cylinder wall structure, the inner layer cylinder wall is provided with a plurality of water permeable holes, the outer layer cylinder wall adopts a corrosion-resistant alloy material, and the bottom of the suction anchor is provided with an inverted cone-shaped guide structure.
  8. 8. The tension leg floating wind power foundation according to claim 1, wherein a connecting seat is arranged at the bottom of the lower upright post (104), a connecting hole correspondingly adapted to the tension rib key (2) is arranged on the connecting seat, and one end of the tension rib key (2) is fixedly connected with the lower upright post (104) through the connecting hole.
  9. 9. The tension leg floating wind power foundation according to claim 1, wherein a plurality of groups of tension tendons (2) are distributed in a matrix, wherein the middle 1 group of tension tendons (2) are correspondingly connected with the center of the lower upright post (104), and the rest groups of tension tendons (2) are correspondingly connected with the end parts of a plurality of horizontal pontoons (101) respectively.
  10. 10. A method of installing a tension leg floating wind power foundation as claimed in any one of claims 1 to 9, comprising: Pre-assembling the tension rib key (2) and the floating body (1); Lowering the anchoring foundation (3) to a preset position on the seabed by adopting hoisting equipment, and fixing the anchoring foundation (3) on the seabed foundation to complete the layout of the anchoring foundation (3); Transporting the floating body (1) to the position above the sea area corresponding to the anchoring foundation (3), and adjusting the posture of the floating body (1) to enable the connecting positions of the floating body (1) and the anchoring foundation (3) to correspond one by one, so as to finish the preliminary positioning of the floating body (1); the other end of the tension rib key (2) pre-assembled on the floating body (1) is correspondingly and fixedly connected with the anchor foundation (3) at the sea bottom to form a symmetrical mooring structure, and the tension rib key (2) is subjected to graded tensioning operation to enable the tension rib key (2) to reach a preset tension value so as to realize stable mooring of the floating body (1); And detecting the connection part of the floating body (1), the tension state of the tension rib key (2) and the fixing effect of the anchoring foundation (3), and finishing the installation of the whole tension leg floating wind power foundation.

Description

Tension leg floating type wind power foundation and installation method thereof Technical Field The invention belongs to the field of offshore wind power, and relates to a tension leg floating wind power foundation and an installation method thereof. Background Under the large trend of clean low-carbon transformation of energy structures, offshore wind power is taken as an important component of renewable energy, and is gradually expanded from a shallow water area on the coast to a deep sea area, and floating wind power becomes a research hotspot and development focus of wind power industry in recent years by virtue of the advantage that the floating wind power can adapt to deep water and complex sea areas. At present, the built floating offshore wind power platform structure adopts a multi-upright semi-submersible floating foundation. The floating foundation has certain stability and deep water adaptability, can meet basic operation requirements, but has obvious cost shortboards, and severely restricts the large-scale and commercial popularization of floating wind power. Through actual measurement and calculation, the cost of the current demonstration model machine is at an extremely high level, about 5 ten thousand yuan/kW, and even if the project is being designed and optimized currently, the cost is difficult to be reduced to below 2 ten thousand yuan/kW after the project is optimized through the prior art means. As can be seen from in-depth analysis, the multi-column semi-submerged floating foundation has the advantages of complex structure, large material consumption, complex manufacturing process and high installation difficulty, and is a core cause of high cost, so that the research and development of the novel floating foundation structure becomes an important path for realizing cost reduction and synergy of floating wind power and promoting industrial scale development. Meanwhile, in some key layout areas, the areas have abundant wind energy resources, but the site conditions are extremely complex, and the characteristics of high wave height and high flow velocity are commonly present. In such sea environments, the current wave current load experienced by the existing multi-column semi-submersible floating bodies is significantly large, thereby causing the floating bodies to generate excessive heave motions. Excessive pitching of the floating body not only can influence the normal running stability of the fan, but also can cause adverse effects on the design, the shape selection and the service life of a mooring system and a dynamic sea cable, such as excessive pitching displacement can increase tension fluctuation of the mooring cable, so that fatigue damage of the mooring cable is easily caused, bending and torsion of the dynamic sea cable can be aggravated, the risk of damage and fracture of the sea cable is increased, the operation and maintenance cost and the potential safety hazard of projects are further improved, and popularization and application of floating wind power in the complex sea areas are limited. In summary, the current floating wind power field faces two main technical bottlenecks, namely the cost of the existing main-stream multi-column semi-submersible floating foundation is too high, the economic requirement of large-scale popularization is difficult to meet, and the existing floating foundation is easy to generate excessive heave motion in a complex sea area with high wave height and high flow velocity, so that the design and stable operation of a mooring system and a dynamic sea cable are not facilitated, and the safety and reliability of projects are affected. Disclosure of Invention The invention aims to solve the technical problems that in the prior art, the multi-column semi-submersible type floating foundation is high in cost, and in complex sea areas with high wave height and high flow velocity, excessive heave motion is easy to generate, and provides a tension leg floating type wind power foundation and an installation method thereof. In order to achieve the above purpose, the invention is realized by adopting the following technical scheme: The invention discloses a tension leg floating type wind power foundation which comprises a floating body, tension tendons and an anchoring foundation, wherein the tension tendons are provided with a plurality of groups, one end of each group is connected with the floating body, the other end of each group is correspondingly connected with the anchoring foundation to form a symmetrical mooring structure, the floating body comprises a middle upright post and a plurality of horizontal buoys arranged around the middle upright post, the plurality of horizontal buoys are uniformly arranged around the middle upright post at intervals in a radial mode and are fixedly connected with the middle upright post, the middle upright post is sequentially and fixedly connected with an upper upright post, a jacket upright post and a lower upright