CN111186535A - Semi-submersible high-power offshore floating wind power platform with flat lower floating body - Google Patents

Semi-submersible high-power offshore floating wind power platform with flat lower floating body Download PDF

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Publication number
CN111186535A
CN111186535A CN202010062143.0A CN202010062143A CN111186535A CN 111186535 A CN111186535 A CN 111186535A CN 202010062143 A CN202010062143 A CN 202010062143A CN 111186535 A CN111186535 A CN 111186535A
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CN
China
Prior art keywords
platform
floating
wind power
flat
semi
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Pending
Application number
CN202010062143.0A
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Chinese (zh)
Inventor
张凯
程小明
张华�
弓国栋
叶永林
丁军
张正伟
陈颖
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Ship Scientific Research Center No 702 Institute of China Shipbuilding Industry Corporation CSIC
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China Ship Scientific Research Center No 702 Institute of China Shipbuilding Industry Corporation CSIC
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Application filed by China Ship Scientific Research Center No 702 Institute of China Shipbuilding Industry Corporation CSIC filed Critical China Ship Scientific Research Center No 702 Institute of China Shipbuilding Industry Corporation CSIC
Priority to CN202010062143.0A priority Critical patent/CN111186535A/en
Publication of CN111186535A publication Critical patent/CN111186535A/en
Pending legal-status Critical Current

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/02Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
    • B63B1/10Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
    • B63B1/12Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly
    • B63B1/125Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly comprising more than two hulls
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/50Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B43/00Improving safety of vessels, e.g. damage control, not otherwise provided for
    • B63B43/02Improving safety of vessels, e.g. damage control, not otherwise provided for reducing risk of capsizing or sinking
    • B63B43/10Improving safety of vessels, e.g. damage control, not otherwise provided for reducing risk of capsizing or sinking by improving buoyancy
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B1/00Hydrodynamic or hydrostatic features of hulls or of hydrofoils
    • B63B1/02Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement
    • B63B1/10Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls
    • B63B1/12Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly
    • B63B2001/128Hydrodynamic or hydrostatic features of hulls or of hydrofoils deriving lift mainly from water displacement with multiple hulls the hulls being interconnected rigidly comprising underwater connectors between the hulls
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B21/00Tying-up; Shifting, towing, or pushing equipment; Anchoring
    • B63B21/50Anchoring arrangements or methods for special vessels, e.g. for floating drilling platforms or dredgers
    • B63B2021/505Methods for installation or mooring of floating offshore platforms on site
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • B63B2035/442Spar-type semi-submersible structures, i.e. shaped as single slender, e.g. substantially cylindrical or trussed vertical bodies
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B63SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63BSHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B35/00Vessels or similar floating structures specially adapted for specific purposes and not otherwise provided for
    • B63B35/44Floating buildings, stores, drilling platforms, or workshops, e.g. carrying water-oil separating devices
    • B63B2035/4433Floating structures carrying electric power plants
    • B63B2035/446Floating structures carrying electric power plants for converting wind energy into electric energy

Abstract

The invention relates to a semi-submersible high-power offshore floating wind power platform with a flat lower floating body, which comprises a fan and a tower drum, wherein the fan is arranged at one end of the tower drum, the semi-submersible high-power offshore floating wind power platform also comprises a platform main body, a mooring cable and an anchoring foundation, and the platform main body is connected and positioned with the anchoring foundation through the mooring cable; the platform main body comprises a plurality of stand columns, a plurality of lower floating bodies and a plurality of upper support rods, the lower floating bodies of each block are mutually butted to form a polygonal structure, each stand column is installed on the surface of each lower floating body and located at the vertex of the polygonal structure, each upper support rod is arranged along the side line of the polygonal structure and connected between adjacent stand columns, and the other end of the tower cylinder is connected with any stand column. The floating wind power platform is simple in structure, the wave-bearing area of the upright post is small, the flat lower floating body is positioned at a deeper position below the water surface, the wave force borne by the main body is small, the motion of the platform in waves can be reduced, the wave resistance of the floating wind power platform is improved, and the fatigue nodes are few due to the fact that the stay bar structure does not exist underwater, and the platform structure is favorably maintained.

Description

Semi-submersible high-power offshore floating wind power platform with flat lower floating body
Technical Field
The invention relates to the technical field of ocean renewable energy sources, in particular to a semi-submersible high-power offshore floating wind power platform suitable for operation in sea areas with water depth of not less than 30 meters.
Background
Although the offshore wind power development and utilization in China have a certain scale at present, the offshore fixed wind farm is mainly developed based on the offshore fixed wind farm, the wind farm is mainly characterized in that a wind turbine generator is fixed on the seabed through a single-pile or jacket type foundation, and the two technologies have the greatest defect that engineering difficulty and manufacturing cost are increased rapidly when the offshore wind power development and utilization is applied to a sea area with the water depth of more than 50 meters. And the sea area with the water depth of more than 50 meters has the characteristics of higher wind speed, better wind quality and the like, and has higher power generation efficiency and larger development potential.
The floating wind power platform as a special platform is essentially different from a conventional ocean structure, and the overall arrangement and configuration design of the floating wind power platform are more technically challenging than that of the traditional floating platform due to the unfavorable factors of large weight, high gravity center position, large wind area, large wind tilting moment and the like of a fan. When the power of a fan is increased, the size of a unit is increased, the wind load is increased, if the motion angle of a floating wind power platform in waves (especially under severe sea conditions, the height of a sense wave is large, the period of a spectral peak is long) is small, the rolling and pitching stiffness of the floating wind power platform system needs to be correspondingly increased, if the mass matrix of the system cannot be correspondingly increased, the resonance period of the platform is inevitably reduced, the resonance period may fall within the wave period range, the system resonates, and the safety of the floating wind power platform system is endangered. Meanwhile, in order to ensure the power generation efficiency of the floating wind power system, the motion of the floating wind power system is required to be as small as possible.
Disclosure of Invention
The applicant carries out research and improvement aiming at the existing problems and provides a semi-submersible high-power offshore floating wind power platform with a flat lower floating body, which is wide in applicable sea area, good in stability and wave resistance and strong in viability under severe sea conditions.
The technical scheme adopted by the invention is as follows:
a semi-submersible high-power offshore floating wind power platform with a flat lower floating body comprises a fan and a tower drum, wherein the fan is installed at one end of the tower drum, the semi-submersible high-power offshore floating wind power platform further comprises a platform main body, mooring cables and an anchoring foundation, and the platform main body is connected and positioned with the anchoring foundation through the mooring cables; the platform main body comprises a plurality of stand columns, a plurality of lower floating bodies and a plurality of upper support rods, the lower floating bodies are mutually butted to form a polygonal structure, each stand column is installed on the surface of each lower floating body and located at the vertex of the polygonal structure, each upper support rod is arranged along the side line of the polygonal structure and connected between adjacent stand columns, and the other end of the tower cylinder is connected with any stand column.
And smooth transition is adopted at the butt joint of the adjacent lower floating bodies.
The width of the lower floating body is not less than that of the upright post.
The mooring cable adopts an anchor chain structure in a deep water area and adopts a composite structure of an anchor chain and a synthetic cable in a shallow water area.
The anchoring foundation adopts any one of a high holding power anchor, a gravity anchor, a pile foundation or a suction anchor.
The cross section of the upright post is any one of a circle, an ellipse or a chamfer square.
The lower float is located below the water surface.
The invention has the following beneficial effects:
the floating wind power platform is simple in structure, the wave bearing area of the stand column is small, the flat lower floating body is located at a deep position below the water surface, the wave force borne by the main body is small, the motion of the platform in waves can be reduced, the wave resistance of the floating wind power platform is improved, and meanwhile, due to the fact that a support rod structure does not exist underwater, fatigue nodes are few, and the platform structure is beneficial to maintenance.
The flat lower floating body is arranged below the upright post, so that sufficient buoyancy can be provided for the floating wind power generation platform, the structural strength and stability of the platform can be guaranteed, larger additional mass is provided for the floating platform in a vertical plane, the resonance period of the platform is improved, the wave period is avoided, and the problem that the resonance period of the high-power floating wind power generation platform is lower is effectively solved.
And (III) the lower floating body can provide larger radiation damping and viscous damping for the floating wind power platform in the vertical plane so as to reduce the motion response of the platform and improve the power generation efficiency of the fan.
And (IV) the structure of the invention adopts the lower floating body, so that the steel amount of the whole system structure is reduced, and the performance is excellent.
Drawings
FIG. 1 is a schematic structural diagram of the present invention.
Fig. 2 is a diagram of a mooring scheme of the present invention.
Fig. 3 is a top view of the present invention.
Fig. 4 is a front view of the present invention.
Fig. 5 is a side view of the present invention.
Fig. 6 is a size view of the circular lower floating body.
Fig. 7 is a schematic size view of the square lower float.
Figure 8 is a graph of added mass versus a circular lower float, a square lower float, and floats of different degrees of flattening.
Figure 9 is a graph of the radiation damping contrast for a round lower float, a square lower float, and floats of different degrees of flattening.
Wherein: 1. a fan; 2. a tower drum; 3. a column; 4. a lower float; 5. an upper stay bar; 6. a mooring line; 7. And (6) anchoring the foundation.
Detailed Description
The following describes specific embodiments of the present invention.
As shown in fig. 1 to 5, the semi-submersible high-power offshore floating wind power platform comprises a wind turbine 1 and a tower drum 2, wherein the wind turbine 1 is installed at one end of the tower drum 2, and further comprises a platform main body, a mooring cable 6 and an anchoring foundation 7, and the platform main body is connected and positioned with the anchoring foundation 7 through the mooring cable 6; the platform main part includes body 4 and many last vaulting poles 5 under a plurality of stands 3, polylith, and body 4 butt joint and the flat polygon structure of an organic whole is formed into to each piece down, and body 4 is located the deep position department below the surface of water down, and the wave power that it bore is little, can reduce the motion of platform main part in the wave. In the embodiment, three lower floating bodies 4 are adopted, each lower floating body 4 is butted to form an equilateral triangle structure, each upright post 3 is arranged on the surface of each lower floating body 4 and is positioned at the vertex of the equilateral triangle structure, and the requirements of fans 1 with different powers on platform stability are met by adjusting the cross section area of each upright post 3 and the side length of the equilateral triangle. Each upper stay bar 5 is arranged along the side line of the equilateral triangle structure and connected between the adjacent upright posts 3, the other end of the tower barrel 2 is connected with any one upright post 3, and the overall gravity center position and stability of the platform are ensured by adjusting the ballast.
And smooth transition is adopted at the butt joint of the adjacent lower floating bodies 4. The width of the lower floating body 4 is not less than that of the upright post 3. The cross section of the upright post 3 is any one of circular, oval or chamfered square. The wave area of the three upright posts 3 near the waterline is small, the wave force received by the platform main body can be effectively reduced, and the wave resistance of the platform main body is improved. The larger the power of the fan 1 is, the higher the requirement on the stability of the platform main body is, so that the stability of the platform can be improved by increasing the sectional area of the upright column 3 or the side length of the equilateral triangle.
Aiming at different wind turbines and sea conditions, the size of the lower floating body 4 can be adjusted to meet the following technical requirements:
providing sufficient buoyancy for the platform body;
and secondly, most of the ballast tanks are arranged on the lower floating body, so that the center of gravity of the whole system is lowered, and the stability of the platform main body is ensured.
And (III) the structural strength of the platform is ensured, and the safety is improved.
Fourthly, the whole system of the invention provides larger additional mass in a vertical plane, so that the resonance period is improved, and the wave period is avoided;
and (V) larger radiation damping and viscous damping are provided in the vertical plane, so that the motion response of the platform is reduced, and the power generation efficiency of the fan is improved.
The mooring cable 6 adopts an anchor chain structure in a deep water area and adopts a composite structure of an anchor chain and a synthetic cable in a shallow water area. The anchoring foundation 7 adopts any one of a high holding power anchor, a gravity anchor, a pile foundation or a suction anchor, and the scheme of a specific mooring system is designed according to specific environmental parameters of an operation sea area.
The invention realizes the functions of providing buoyancy, additional mass, damping and structural support among the columns on the lower floating body in a centralized way, obviously provides buoyancy and structural support for the platform due to the larger size of the lower floating body 4, but how to provide the larger additional mass and damping is explained as follows:
according to the theory of three-dimensional potential flow, when an object moves in water, the water can generate a reaction force to the moving object, the force is called as radiation force, and the expression of the radiation force is as follows:
in the above-mentioned formula,is the acceleration of the object and is the acceleration of the object,for object velocity, a and B are the additional mass and radiation damping, respectively, which are related to the shape of the object.
As shown in fig. 6 and 7, the circular lower floating body (b) with the same volume is calculatedCylinder) Comparing the additional mass and the radiation damping of the square lower floating body (Box1) and the floating bodies (Box 2-Box 7) with different flatness degrees in the vertical direction (along the Z-axis direction), the flatter lower floating body structure can be obtained, and the additional mass and the radiation damping value are larger.
The dimensions, the additional mass contrast curves and the radiation damping contrast curves of the circular lower float, the square lower float and the floats with different flatness degrees are shown in table 1, fig. 8 and fig. 9:
table 1: size of circular lower floating body, square lower floating body and floating bodies with different flatness degrees
As can be seen from table 1, fig. 8 and fig. 9, the calculated additional mass and radiation damping of the circular lower float (Cylinder) and the square lower float (Box1) are smaller than the flat lower float (B/H >1.0, Box2 to Box7) in the wave frequency range, and the larger the value of B/H (i.e., the flatter the more), the larger the value of the additional mass and radiation damping that can be provided.
For the viscous damping part, which is also related to the shape of the body, there is a similar law to the above-mentioned radiation damping, which is positively related to the resistance coefficient AND the area of the body in the moving direction, referring to norwegian classification code (DNV-RP-C205, environmentsystem connections AND environmentsystem LOADS), the resistance coefficient of the body in the vertical direction can be compared, the area can be calculated according to the size, see table 2 in particular, it can be seen that the product of the resistance coefficient AND the area of the circular lower float (Cylinder) AND the square lower float (Box1) is smaller than that of the flat lower float (B/H >1.0, Box 2-Box 7), AND the larger the value of B/H (i.e., the flatter the value of B/H) is, the larger the numerical value is.
Table 2: resistance coefficient and area of circular lower floating body, square lower floating body and floating bodies with different flatness degrees
The foregoing description is illustrative of the present invention and is not to be construed as limiting thereof, the scope of the invention being defined by the appended claims, which may be modified in any manner without departing from the basic structure thereof.

Claims (7)

1. The utility model provides a high-power offshore floating wind power platform of semi-submerged type with body under flat, includes fan (1), tower section of thick bamboo (2), install in the one end of tower section of thick bamboo (2) fan (1), its characterized in that: the platform is characterized by also comprising a platform main body, mooring cables (6) and an anchoring foundation (7), wherein the platform main body is connected and positioned with the anchoring foundation (7) through the mooring cables (6); the platform main body comprises a plurality of upright posts (3), a plurality of lower floating bodies (4) and a plurality of upper support rods (5), the lower floating bodies (4) are mutually butted and integrally formed into a flat polygonal structure, each upright post (3) is installed on the surface of each lower floating body (4) and is positioned at the vertex of the polygonal structure, each upper support rod (5) is arranged along the sideline of the polygonal structure and connected between the adjacent upright posts (3), and the other end of the tower barrel (2) is connected with any upright post (3).
2. The semi-submersible high-power offshore floating wind power platform with a flat lower float of claim 1, wherein: the joint of the adjacent lower floating bodies (4) adopts smooth transition.
3. The semi-submersible high-power offshore floating wind power platform with a flat lower float of claim 1, wherein: the width of the lower floating body (4) is not less than that of the upright post (3).
4. The semi-submersible high-power offshore floating wind power platform with a flat lower float of claim 1, wherein: the mooring cable (6) adopts an anchor chain structure in a deep water area and adopts a composite structure of an anchor chain and a synthetic cable in a shallow water area.
5. The semi-submersible high-power offshore floating wind power platform with a flat lower float of claim 1, wherein: the anchoring foundation (7) adopts any one of a high holding power anchor, a gravity anchor, a pile foundation or a suction anchor.
6. The semi-submersible high-power offshore floating wind power platform with a flat lower float of claim 1, wherein: the cross section of the upright post (3) is any one of circular, oval or chamfered square.
7. The semi-submersible high-power offshore floating wind power platform with a flat lower float of claim 1, wherein: the lower floating body (4) is positioned below the water surface.
CN202010062143.0A 2020-01-19 2020-01-19 Semi-submersible high-power offshore floating wind power platform with flat lower floating body Pending CN111186535A (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120103244A1 (en) * 2010-10-28 2012-05-03 Jin Wang Truss Cable Semi-submersible Floater for Offshore Wind Turbines and Construction Methods
CN102765466A (en) * 2012-07-27 2012-11-07 北京金风科创风电设备有限公司 Semi-submersible type marine floating fan base
CN103010415A (en) * 2011-09-22 2013-04-03 黄灿光 Prestressed concrete floating platform for supporting offshore wind turbine and ocean power generator
CN204110335U (en) * 2014-05-19 2015-01-21 中国海洋大学 Floating-type offshore wind power foundation
CN107539433A (en) * 2017-07-03 2018-01-05 中国船舶工业集团公司第七0八研究所 A kind of semi-submersible type fan platform
CN108715214A (en) * 2018-05-14 2018-10-30 重庆大学 A kind of ship shape semi-submersible type fan platform

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20120103244A1 (en) * 2010-10-28 2012-05-03 Jin Wang Truss Cable Semi-submersible Floater for Offshore Wind Turbines and Construction Methods
CN103010415A (en) * 2011-09-22 2013-04-03 黄灿光 Prestressed concrete floating platform for supporting offshore wind turbine and ocean power generator
CN102765466A (en) * 2012-07-27 2012-11-07 北京金风科创风电设备有限公司 Semi-submersible type marine floating fan base
CN204110335U (en) * 2014-05-19 2015-01-21 中国海洋大学 Floating-type offshore wind power foundation
CN107539433A (en) * 2017-07-03 2018-01-05 中国船舶工业集团公司第七0八研究所 A kind of semi-submersible type fan platform
CN108715214A (en) * 2018-05-14 2018-10-30 重庆大学 A kind of ship shape semi-submersible type fan platform

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