US20120103244A1 - Truss Cable Semi-submersible Floater for Offshore Wind Turbines and Construction Methods - Google Patents

Truss Cable Semi-submersible Floater for Offshore Wind Turbines and Construction Methods Download PDF

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Publication number
US20120103244A1
US20120103244A1 US13/269,592 US201113269592A US2012103244A1 US 20120103244 A1 US20120103244 A1 US 20120103244A1 US 201113269592 A US201113269592 A US 201113269592A US 2012103244 A1 US2012103244 A1 US 2012103244A1
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United States
Prior art keywords
column
floating
truss
tower
composite
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Abandoned
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US13/269,592
Inventor
Ling Gong
Jin Wang
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Jin Wang
Ling Gong
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Priority to US40773010P priority Critical
Application filed by Jin Wang, Ling Gong filed Critical Jin Wang
Priority to US13/269,592 priority patent/US20120103244A1/en
Publication of US20120103244A1 publication Critical patent/US20120103244A1/en
Abandoned legal-status Critical Current

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    • 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 
    • 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
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/70Wind energy
    • Y02E10/727Offshore wind turbines

Abstract

Truss cable semi-submersible floater for offshore wind turbines and construction methods are provided. A floating system includes a hull, a tensioned cable system, and a tower. The hull includes vertical buoyant columns with one column at the center of the pattern, larger size column base tanks, and a truss system, all of which are coupled to each other for supporting the tower and wind turbines. The column can be made of hybrid materials, including steel and composite-concrete. The steel section and the composite-concrete section of the column can be connected by grouting. The tensioned cable system including upper, lower, and diagonal tensioned cables to connect the column, the column base, and the tower to reduce the bending moments and improve stability, strength and dynamic performance of the hull structure.

Description

    CROSS-REFERENCE TO RELATED APPLICATIONS
  • This present application claims the benefits of priority from the United States of America provisional application No. 61/407,730, entitled “TRUSS CABLE SEMI-SUBMERSIBLE FLOATER FOR OFFSHORE WIND TURBINES AND CONSTRUCTION METHODS”, filed on Oct. 28, 2010.
  • STATEMENT REGARDING FEDERALLY SPONSORED RESEARCH OR DEVELOPMENT
  • Not applicable.
  • REFERENCES
    • (1) U.S. Pat. No. : 4,702,321, Filing date: Sep. 20, 1985, Issue date: Oct. 27, 1987
    • (2) U.S. Pat. No. : 6,263,824, Filing date: Dec. 23, 1997, Issue date: Jul. 24, 2001
    • (3) U.S. Pat. No. : 7,819,073, Filing date: Jun. 2, 2006, Issue date: Oct. 26, 2010
    • (4) U.S. Pat. No. : 7,612,462, Filing date: Apr. 24, 2008, Issue date: Nov. 3, 2009
    FIELD OF INVENTION
  • Embodiments of present invention relate generally to the field of floating offshore wind turbines for offshore wind power generation. More particularly, embodiments of present invention relate to the field of a semi-submersible floater with a truss system for connecting the columns and a tensioned cable system for connecting the main structural components to improve structural strength and integrity, and associated methods for construction and installation. Furthermore, the invention also relates to the use of composite materials for the whole or part of the semi-submersible wind turbine floater construction.
  • BACKGROUND OF INVENTION
  • Conventionally, semi-submersible floaters used in deepwater offshore oil and gas exploration and production are built with columns and pontoons which are enclosed buoyant structures using steel material as shown in FIG. 1. This kind of oil and gas steel structure and hull form are large and costly. The present invention aims to provide an innovative semi-submersible floater with unique configuration connected by truss and cables which enables a floating wind turbine to be constructed, towed vertically and installed offshore at significantly lower cost than a conventional semi-submersible floater.
  • SUMMARY OF INVENTION
  • Truss cable semi-submersible floater for offshore wind turbines and construction methods are provided to provide more cost and weight efficient floater with better stability and structural strength and dynamic performance for offshore wind turbines. Parts of the structure can be made of composite materials.
  • BRIEF DESCRIPTION OF DRAWINGS
  • FIG. 1 illustrates a prior art of a semi-submersible floater used in oil and gas production according to some embodiments of the present invention.
  • FIG. 2 illustrates a front view of a truss cable semi-submersible floater for a wind turbine according to some embodiments of the present invention.
  • FIG. 3 illustrates a front view of a tower sleeve with special contact pads according to some embodiments of the present invention.
  • FIG. 4 illustrates a front view of a tensioned cable system for a semi-submersible floater for a wind turbine according to some embodiments of the present invention.
  • FIG. 5 illustrates a perspective view of construction of a column with composite donut ring according to some embodiments of the present invention.
  • FIG. 6 illustrates a perspective view of a typical column and base steel and composite-concrete system according to some embodiments of the present invention.
  • DETAILED DESCRIPTION OF THE PREFFERED EMBODIMENT
  • With reference to FIG. 2, a truss cable semi-submersible floater (hereinafter referred as “floater”) includes a hull, a tower, and a tensioned cable system. The hull mainly includes 3 components: columns, including a center column 1 a and outer columns 1 b, trusses coupled to the columns, including an upper truss 2 a and a lower truss 2 b, and column bases coupled to the columns and the trusses, including a center base 3 a and outer bases 3 b. The hull can have multiple outer columns for stability, typically 3 columns (as shown in FIG. 2), but also can have 4 columns or more. The hull has an in-service draft in the order of 60 ft to 80 ft depending on metocean conditions of the deployed area. The columns are most buoyant to provide the buoyancy for the wind turbine and rotor blades, which can be coupled with the floater and located above the water surface. The column bases, which can be tanks, provide stability for wet tow and hold ballast (sold or water ballast) for inplace conditions. The upper and lower trusses can be welded to the columns.
  • The tower 6 extends from the top of the center column 1 a to the rotor for supporting the turbine and rotor blades. The tower 6 can be formed as a column structure. In some embodiment, as shown in FIG. 3, a tower sleeve 4 can be used with the tower 6. The tower sleeve 4 is a specially designed structure to allow the tower 6 to penetrate it without rigid connection. In some embodiment, the tower sleeve 4 is designed to contact the base of the tower 6 at certain points through specially designed contact pads to merely transmit forces without transmitting moments. This design feature will reduce the load into the upper truss 2 a to give more efficient structural design.
  • With reference to FIG. 4, the tensioned cable system can have multiple tensioned cables to connect the tower and the hull together to improve the dynamic performance of the floater structure. In some embodiments, the tensioned cable system includes lower tensioned cables 7 a for connecting outer bases 3 b at the bottom of the columns. In some embodiments, the tensioned cable system includes upper tensioned cables 7 b for connecting the topside of the outer columns 1 b. In some embodiments, the tensioned cable system includes diagonal tensioned cables 7 c for diagonally connecting the mid lower tower 6 to the end of the upper truss 2 a, which is at the top of the outer column 1 b, to reduce the bending moment at the bottom of the tower 6. The tensioned cables are preferably made of steel wire or similar materials.
  • In some embodiment, the floater can include a mooring line 5. The hull with three outer columns 1 b can have 3 mooring lines 5, which can be pre-installed with drag anchor, suction anchor, or pile anchor for stabilizing the floater.
  • With reference to FIG. 5, the columns can be made of hybrid materials, including steel and composite materials, for reducing cost and weight. The upper and lower columns 8 b are preferably made of steel, and the middle column 8 a is made of a series of composite donut rings, which are made of composite tubes filled with concrete inside. The upper and lower columns 8 b can be connected to the middle column 8 a by grouting. In some embodiments, a watertight composite membrane 8 c can be glued to the inside of the composite donut ring or the outside of the composite donut ring, even throughout the entire column to ensure that the column is watertight.
  • With reference to FIG. 6, a column includes a deck, a girder, and composite donut rings. The composite donut rings are placed on each other vertically to form a composite column section. The girder is substantially placed at 90 degrees inside the column. The deck is to be used to divide the column into two watertight compartments. Both the deck and the girder are preferably made of steel. A column base, as a column, also includes a deck, a girder and composite donut rings.
  • In some embodiments, a method of constructing a column with composite materials includes providing composite donut-shaped rings, placing multiple composite donut rings on each other vertically to form a composite section of a column, providing a steel section of the column and connecting it to the composite section of the column by grouting, attaching a watertight composite membrane to the inside or outside of the composite donut rings for connecting the composite donut rings and ensuring water tightness, placing a substantially vertical girder into the column, placing a deck into the column to divide the column into two watertight compartments. All or parts of the methods described above can be done on the land. Besides, a method of constructing a floater can further include installing a column base, a tensioned cable system, a tower, and a tower sleeve to the column, and coupling upper and lower trusses to the upper and lower ends of the columns. Then, the assembly of the columns can be loaded into water. The installation of turbine tower and assembly can be done in sequence in the water at quayside. Finally, the entire assembly of the floating system can be towed to the sea preferably at a draft within the depth of the column base, towered to in-service draft and fixed at the seabed with pre-set mooring lines.

Claims (8)

1. A floating system comprising:
a plurality of horizontal lower and upper truss system;
a plurality of vertical buoyant columns, with one column at the center of the pattern, coupled with the truss system at the upper level;
a plurality of large base tanks with diameters greater than the vertical buoyant columns, coupled with the truss system and the vertical columns, with one large base tank at the center of the pattern, at the lower level for ballast water or solid material;
a wind turbine assembly supported by the column at the center of the pattern associated with the central large base tank at the lower level while horizontally constrained at the upper level by the truss system;
a plurality of tensioned cable system of multiple tensioned cables to connect diagonally the wind turbine tower at the middle portion and the upper ends of the vertical buoyant columns together;
a plurality of tensioned cable system of multiple tensioned cables to connect diagonally the upper and lower ends of the vertical buoyant columns;
a plurality of mooring lines linking the floating system to the sea floor.
2. The floating system according to claim 1 wherein said entire assembly can be constructed using conventional steel and composite materials according to a method comprising;
donut shape rings and tubes made of composite material first to form one column ring;
the donut rings are placed on top of each other and filled with concrete to each tube;
a watertight composite membrane is glued to the donut rings either from inside or outside or both to ensure the water tightness of the column and connecting each of the composite rings;
the composite column section is coupled with the upper and lower sections of the column by grouting;
the upper and lower sections of the column are made of conventional steel;
the upper and lower trusses are welded to the column upper and lower sections;
the assembly of the floating system is carried out on land;
the completed floating system is loaded out into the water at quay;
the wind turbine tower and assembly is installed on the floating system at quad side;
the floating system is towed to sea at a installation tow draft within the depth of the large base tanks;
the floating system is connected to the pre-set mooring lines at sea;
the floating system is lowered to the in-service draft by water ballasting.
3. The floating system according to claim 1 wherein said entire assembly having a sleeve system for the wind turbine tower comprising,
a tower sleeve associated with the center column at the upper level connected by the truss system to the outer columns;
the tower sleeve is to allow the tower to penetrate it without rigid connection;
the tower sleeve is to have contact pads to contact the tower at certain points;
4. The floating system according to claim 1 wherein said entire assembly having a truss system comprising horizontal truss space frame members at the lower and upper levels;
5. The truss system according to claim 4 wherein said truss space frame members can be made of light-weight composite material;
6. The floating system according to claim 1 wherein said entire assembly having a tensioned cable system comprising diagonal tensioned cables;
7. The floating system according to claim 1 wherein said entire assembly having a vertical buoyant column at the center of the pattern;
8. The floating system according to claim 1 wherein said entire assembly having a plurality of base tanks with diameter greater than the vertical buoyant columns;
US13/269,592 2010-10-28 2011-10-08 Truss Cable Semi-submersible Floater for Offshore Wind Turbines and Construction Methods Abandoned US20120103244A1 (en)

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US40773010P true 2010-10-28 2010-10-28
US13/269,592 US20120103244A1 (en) 2010-10-28 2011-10-08 Truss Cable Semi-submersible Floater for Offshore Wind Turbines and Construction Methods

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US13/269,592 US20120103244A1 (en) 2010-10-28 2011-10-08 Truss Cable Semi-submersible Floater for Offshore Wind Turbines and Construction Methods

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Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2387232A1 (en) * 2012-07-18 2012-09-18 Universidad De Cantabria Semi-submersible platform for use in the open sea
ES2387342A1 (en) * 2012-07-18 2012-09-20 Universidad De Cantabria Semi-submersible triangular platform for use in the open sea
US20120294681A1 (en) * 2011-05-20 2012-11-22 Carlos Wong Floating wind farm with energy storage facility
US20130233231A1 (en) * 2010-11-04 2013-09-12 University Of Maine System Board Of Trustees Floating Wind Turbine Platform and Method of Assembling
ES2440894A1 (en) * 2013-10-23 2014-01-30 Saitec, S.A. Procedure for manufacturing a offshore wind platform, resulting platform and wind energy utilization system (Machine-translation by Google Translate, not legally binding)
ITPE20120013A1 (en) * 2012-07-31 2014-02-01 Antonio Teodori Offshore wind ship
WO2015048147A1 (en) * 2013-09-24 2015-04-02 University Of Maine System Board Of Trustees Floating wind turbine support system
EP2931597A1 (en) * 2012-10-05 2015-10-21 Hexicon AB Floating platform and energy producing plant comprising such a floating platform
US9499241B2 (en) * 2013-06-27 2016-11-22 Alstom Renewable Technologies Floating offshore structures
US20160340000A1 (en) * 2014-02-06 2016-11-24 University Of Maine System Board Of Trustees Method Of Assembling A Floating Wind Turbine Platform
US9518564B2 (en) 2010-11-04 2016-12-13 University Of Maine System Board Of Trustee Floating hybrid composite wind turbine platform and tower system
WO2016207427A1 (en) 2015-06-26 2016-12-29 Single Buoy Moorings Inc. Floating wind turbine assembly, as well as a method for mooring such a floating wind turbine assembly
US10259542B2 (en) * 2013-10-30 2019-04-16 Gicon Windpower Ip Gmbh Support structure floating in the open sea and connected to anchors by bracing means, for wind turbines, service stations or converter stations
US10337501B2 (en) 2014-11-26 2019-07-02 Saitec Offshore Technologies S.L.U. Floating platform for harnessing wind energy
CN109982923A (en) * 2016-11-25 2019-07-05 日本日联海洋株式会社 Floating structure
WO2020002160A1 (en) * 2018-06-26 2020-01-02 Universitaet Stuttgart Floating support structure for a wind turbine
CN111186535A (en) * 2020-01-19 2020-05-22 中国船舶科学研究中心(中国船舶重工集团公司第七0二研究所) Semi-submersible high-power offshore floating wind power platform with flat lower floating body
NO20190637A1 (en) * 2019-05-21 2020-11-23 Ægir Harvest As Floating wind turbine platform
WO2021058531A1 (en) 2019-09-25 2021-04-01 Clovers As A floating metal platform

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US8169099B2 (en) * 2008-08-18 2012-05-01 Samuel Roznitsky Deep offshore floating wind turbine and method of deep offshore floating wind turbine assembly, transportation, installation and operation
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US8235629B2 (en) * 2004-10-06 2012-08-07 Blue H Intellectual Property Cyprus Ltd. Submerged floating foundation with blocked vertical thrust as support base for wind turbine, electrolyser and other equipment, combined with fish farming
US8373292B2 (en) * 2008-04-24 2013-02-12 Hm Power Ab Frame structure for supporting a wind power plant
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US8235629B2 (en) * 2004-10-06 2012-08-07 Blue H Intellectual Property Cyprus Ltd. Submerged floating foundation with blocked vertical thrust as support base for wind turbine, electrolyser and other equipment, combined with fish farming
US8471399B2 (en) * 2007-11-19 2013-06-25 Windsea As Floating wind power apparatus
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Cited By (32)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US20130233231A1 (en) * 2010-11-04 2013-09-12 University Of Maine System Board Of Trustees Floating Wind Turbine Platform and Method of Assembling
US9518564B2 (en) 2010-11-04 2016-12-13 University Of Maine System Board Of Trustee Floating hybrid composite wind turbine platform and tower system
US9394035B2 (en) * 2010-11-04 2016-07-19 University Of Maine System Board Of Trustees Floating wind turbine platform and method of assembling
US8662793B2 (en) * 2011-05-20 2014-03-04 Carlos Wong Floating wind farm with energy storage facility
US20120294681A1 (en) * 2011-05-20 2012-11-22 Carlos Wong Floating wind farm with energy storage facility
ES2387342A1 (en) * 2012-07-18 2012-09-20 Universidad De Cantabria Semi-submersible triangular platform for use in the open sea
ES2387232A1 (en) * 2012-07-18 2012-09-18 Universidad De Cantabria Semi-submersible platform for use in the open sea
ITPE20120013A1 (en) * 2012-07-31 2014-02-01 Antonio Teodori Offshore wind ship
EP2931597A4 (en) * 2012-10-05 2016-07-27 Hexicon Ab Floating platform and energy producing plant comprising such a floating platform
EP2931597A1 (en) * 2012-10-05 2015-10-21 Hexicon AB Floating platform and energy producing plant comprising such a floating platform
US9499241B2 (en) * 2013-06-27 2016-11-22 Alstom Renewable Technologies Floating offshore structures
CN105793563B (en) * 2013-09-24 2019-01-22 缅因大学系统委员会 Floatation type wind turbine support system
JP2016531804A (en) * 2013-09-24 2016-10-13 ユニバーシティ オブ メイン システム ボード オブ トラスティズ Floating windmill support system
CN105793563A (en) * 2013-09-24 2016-07-20 缅因大学系统委员会 Floating wind turbine support system
WO2015048147A1 (en) * 2013-09-24 2015-04-02 University Of Maine System Board Of Trustees Floating wind turbine support system
EP3049668A4 (en) * 2013-09-24 2017-05-31 University of Maine System Board of Trustees Floating wind turbine support system
US9964097B2 (en) 2013-09-24 2018-05-08 University Of Maine System Board Of Trustees Floating wind turbine support system
ES2440894A1 (en) * 2013-10-23 2014-01-30 Saitec, S.A. Procedure for manufacturing a offshore wind platform, resulting platform and wind energy utilization system (Machine-translation by Google Translate, not legally binding)
US10259542B2 (en) * 2013-10-30 2019-04-16 Gicon Windpower Ip Gmbh Support structure floating in the open sea and connected to anchors by bracing means, for wind turbines, service stations or converter stations
US10518846B2 (en) * 2014-02-06 2019-12-31 University Of Maine System Board Of Trustees Method of mooring floating wind turbine platforms
US20160340000A1 (en) * 2014-02-06 2016-11-24 University Of Maine System Board Of Trustees Method Of Assembling A Floating Wind Turbine Platform
US10336404B2 (en) * 2014-02-06 2019-07-02 University Of Maine System Board Of Trustees Method of assembling a floating wind turbine platform
US10337501B2 (en) 2014-11-26 2019-07-02 Saitec Offshore Technologies S.L.U. Floating platform for harnessing wind energy
US10661862B2 (en) 2015-06-26 2020-05-26 Single Buoy Moorings Inc. Floating wind turbine assembly, as well as a method for mooring such a floating wind turbine assembly
WO2016207427A1 (en) 2015-06-26 2016-12-29 Single Buoy Moorings Inc. Floating wind turbine assembly, as well as a method for mooring such a floating wind turbine assembly
CN109982923A (en) * 2016-11-25 2019-07-05 日本日联海洋株式会社 Floating structure
EP3546337A4 (en) * 2016-11-25 2020-07-08 Japan Marine United Corporation Floating structure
WO2020002160A1 (en) * 2018-06-26 2020-01-02 Universitaet Stuttgart Floating support structure for a wind turbine
NO20190637A1 (en) * 2019-05-21 2020-11-23 Ægir Harvest As Floating wind turbine platform
NO345344B1 (en) * 2019-05-21 2020-12-21 Ægir Harvest As Floating wind turbine platform
WO2021058531A1 (en) 2019-09-25 2021-04-01 Clovers As A floating metal platform
CN111186535A (en) * 2020-01-19 2020-05-22 中国船舶科学研究中心(中国船舶重工集团公司第七0二研究所) Semi-submersible high-power offshore floating wind power platform with flat lower floating body

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