WO2004113719A1 - Wave power station - Google Patents

Wave power station Download PDF

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Publication number
WO2004113719A1
WO2004113719A1 PCT/NO2004/000173 NO2004000173W WO2004113719A1 WO 2004113719 A1 WO2004113719 A1 WO 2004113719A1 NO 2004000173 W NO2004000173 W NO 2004000173W WO 2004113719 A1 WO2004113719 A1 WO 2004113719A1
Authority
WO
WIPO (PCT)
Prior art keywords
floating
power plant
wave power
wave
plant according
Prior art date
Application number
PCT/NO2004/000173
Other languages
French (fr)
Inventor
Hans ØIGARDEN
Fred. Olsen
Original Assignee
Fobox As
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Fobox As filed Critical Fobox As
Publication of WO2004113719A1 publication Critical patent/WO2004113719A1/en

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
    • F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
    • F03B13/14—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy
    • F03B13/16—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem"
    • F03B13/18—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore
    • F03B13/1845—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore and the wom slides relative to the rem
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
    • F03B—MACHINES OR ENGINES FOR LIQUIDS
    • F03B13/00—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates
    • F03B13/12—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy
    • F03B13/14—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy
    • F03B13/16—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem"
    • F03B13/18—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore
    • F03B13/1845—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore and the wom slides relative to the rem
    • F03B13/185—Adaptations of machines or engines for special use; Combinations of machines or engines with driving or driven apparatus; Power stations or aggregates characterised by using wave or tide energy using wave energy using the relative movement between a wave-operated member, i.e. a "wom" and another member, i.e. a reaction member or "rem" where the other member, i.e. rem is fixed, at least at one point, with respect to the sea bed or shore and the wom slides relative to the rem not vertically
    • Y—GENERAL 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
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/30—Energy from the sea, e.g. using wave energy or salinity gradient

Definitions

  • the present invention regards a wave power plant in accordance with the preamble of the appended Claim 1.
  • a wave power plant is known from WO 01/96738, based on two bodies that are set to oscillate in opposite phases.
  • the bodies are arranged in such a manner that one body forms a ring around the other.
  • Both bodies consist of a floating component and a mass component.
  • the floating component floats awash, while the mass component is rigidly connected to the floating component and is located a distance below the water surface.
  • the mass component is designed to collect surrounding water. By opening and closing ports in the mass component, the inertia of this component can be changed.
  • the natural frequency of the bodies can be adapted to the wave frequency.
  • the two bodies can be given different natural frequencies, causing them to oscillate out of step.
  • a hydraulic connection between the two components provides extraction of energy.
  • Opening and closing of ports in the mass component means that there are moving parts involved which are submerged more or less the whole time.
  • the strain on these parts is considerable, and they are relatively inaccessible for maintenance.
  • the connection between the mass component and the floating component is also placed under considerable strain.
  • Another significant disadvantage is the considerable movement of the two bodies. Thus the task of maintaining the power plant during operation becomes virtually impossible.
  • the object of the present invention is to provide a power plant with a simpler design, with a minimum of submerged moving parts. Moreover, it is an object of the present invention to make it possible to move around on the power plant while in operation. It is a further object of the invention to improve the efficiency of this type of power plant.
  • Figure 1 schematically shows a floating power plant according to the invention
  • Figure 2 is a top view the power plant of Figure 1;
  • Figure 3 is a longitudinal section through the power plant.
  • FIG. 1 shows a perspective view of the floating power plant.
  • the power plant generally consists of a floating structure 1, which has a general U-shape with sidewalls 2 and 3 and a base 4.
  • the floating structure is open at the ends.
  • On the inside of the sidewalls 2 and 3 are guide rails 5 and 6.
  • a floating body 7 is supported between pairs of guide rails 5 and 6.
  • the floating body 7 is an air-filled cylinder, with a circular, oval or drop-shaped cross section.
  • the floating bodies 7 have pins 8 and 9 extending f om either end.
  • the pins 8 and 9 have at their outer ends balls 10 and 11 that are designed to be placed in a dovetail groove 12 in respective guide rails 5, 6.
  • the width of the dovetail groove 12 across the pins 8, 9 is slightly larger than the diameter of the ball 10, 11, while the width of the groove in the longitudinal direction of the pins 8, 9 is approximately twice that of the ball 10, 11. With this, the floating body can also move slightly in the longitudinal direction. This leaves room for the floating body 7 to assume a slanting position.
  • Figure 3 is a longitudinal section through the power plant, which shows that the floating bodies have assumed a slanting position. By so doing, the floating bodies 7 may follow the movement of waves that lift the floating body to different extents at either end.
  • the floating structure is designed to be directed with one opening against the direction of the waves.
  • the waves will thereby enter between the sidewalls 2 and 3 and pass under all the floating bodies.
  • the base rises from the incoming end towards the outgoing end, or is convex, causing the wave height to increase as the wave travels into the power plant. This will counter the dampening of the wave which takes place as a result of energy being extracted from the wave at the first floating bodies to be hit by the wave.
  • the sidewalls may also be formed in a manner such as to reduce the distance between the walls from the incoming end to the outgoing end, or the sidewalls may be convex. This will also increase the wave height from the incoming to the outgoing end.
  • the floating structure can consist of massive walls, as shown, or it may be a trussed structure.
  • the floating bodies 7 may be completely filled with air or partially filled with air and water. Means may be provided for adjusting the fill-up level of water, and consequently the draught of the floating bodies.
  • the floating structure will be appropriately anchored by means of anchors, in a manner such that the one open end faces the prevailing wave direction.
  • Winches may be provided on board, which slacken and take in the anchor line in order to turn the structure against the wave direction.
  • a rudder and sensors on the rudder may be provided for this purpose, which register the wave direction and transmits signals to the winches, which in turn slacken and take in the anchor line in order to turn the structure against the waves.
  • the transmission of energy from the floating bodies may for instance occur by means of hydraulic cylinders that extend along the groove 12 in the guide rails and abut the ball 10, 11.
  • the onward transmission of the hydraulic energy produced in the hydraulic cylinder will be obvious to a person skilled in the art. This may take place e.g. by hydraulic pressure being transferred via hydraulic lines to a hydraulic motor, which in turn drives an electric generator. Then the electrical energy can be transmitted to shore in a conventional manner per se.
  • the structure may be equipped with damping devices to dampen wave induced motions of the structure, to ensure that this moves as little as possible in the vertical direction.
  • the wave dampers may be for instance of the type described in Norwegian patent no. 300883 or Norwegian patent no. 300884. With the structure at the greatest possible degree of rest, it becomes possible for personnel to go on board the structure to carry out maintenance or adjustments.
  • the floating bodies may be filled with water by opening a closing device at the top of the floating body. This is located above water, and as such is easily accessible. During this operation, the hydraulic cylinders may be locked hydraulically to prevent the floating body from moving. Once the closing device has been opened, water will flow through an opening in the base of the floating body. By maintaining the floating body at a predetermined depth of submersion, the water can be allowed to fill the floating body until the level inside the body is the same as outside. Afterwards, the closing device can be closed and the hydraulic lock released. The depth of submersion during filling of water is determined by the predominant wave frequency. If this changes, e.g. due to seasonal variations, the procedure may be repeated.
  • the floating body is run up or down hydraulically to the desired depth of submersion and the closing device is opened in order to either fill more water or let water out.
  • the closing device is opened in order to either fill more water or let water out.
  • use can be made of a crane that can be permanently fixed to the floating structure.
  • the other floating bodies can produce power in the normal manner while this operation is taking place.
  • the natural frequency of the floating body is also dependent on the depth of submersion.
  • the depth of submersion of the floating body will have to be reduced, as the deflection may otherwise become smaller than the wave height.
  • it is possible to use a greater depth of submersion which will lead to an increase in the energy production.

Abstract

A wave power plant designed to float on the sea or a lake to produce energy, comprising a floating structure and floating bodies that move vertically relative to the floating structure. The floating bodies are arranged to float awash and are connected to the floating structure at two independent supports, whereby the floating body may assume a slanting position with respect to the horizontal plane.

Description

Wave power station
The present invention regards a wave power plant in accordance with the preamble of the appended Claim 1.
A wave power plant is known from WO 01/96738, based on two bodies that are set to oscillate in opposite phases. The bodies are arranged in such a manner that one body forms a ring around the other. Both bodies consist of a floating component and a mass component. The floating component floats awash, while the mass component is rigidly connected to the floating component and is located a distance below the water surface. The mass component is designed to collect surrounding water. By opening and closing ports in the mass component, the inertia of this component can be changed. By so doing, the natural frequency of the bodies can be adapted to the wave frequency. Moreover, the two bodies can be given different natural frequencies, causing them to oscillate out of step. A hydraulic connection between the two components provides extraction of energy.
Opening and closing of ports in the mass component means that there are moving parts involved which are submerged more or less the whole time. The strain on these parts is considerable, and they are relatively inaccessible for maintenance. The connection between the mass component and the floating component is also placed under considerable strain. Another significant disadvantage is the considerable movement of the two bodies. Thus the task of maintaining the power plant during operation becomes virtually impossible.
The object of the present invention is to provide a power plant with a simpler design, with a minimum of submerged moving parts. Moreover, it is an object of the present invention to make it possible to move around on the power plant while in operation. It is a further object of the invention to improve the efficiency of this type of power plant.
This is achieved through the characteristics that appear from the characterising part of the appended Claim 1. The invention will now be explained in greater detail through preferred embodiments and with reference to the accompanying drawings, in which:
Figure 1 schematically shows a floating power plant according to the invention;
Figure 2 is a top view the power plant of Figure 1; and
Figure 3 is a longitudinal section through the power plant.
Figure 1 shows a perspective view of the floating power plant. The power plant generally consists of a floating structure 1, which has a general U-shape with sidewalls 2 and 3 and a base 4. The floating structure is open at the ends. On the inside of the sidewalls 2 and 3 are guide rails 5 and 6. A floating body 7 is supported between pairs of guide rails 5 and 6. Preferably, the floating body 7 is an air-filled cylinder, with a circular, oval or drop-shaped cross section.
As shown in Figure 2, the floating bodies 7 have pins 8 and 9 extending f om either end. The pins 8 and 9 have at their outer ends balls 10 and 11 that are designed to be placed in a dovetail groove 12 in respective guide rails 5, 6. The width of the dovetail groove 12 across the pins 8, 9 is slightly larger than the diameter of the ball 10, 11, while the width of the groove in the longitudinal direction of the pins 8, 9 is approximately twice that of the ball 10, 11. With this, the floating body can also move slightly in the longitudinal direction. This leaves room for the floating body 7 to assume a slanting position.
Figure 3 is a longitudinal section through the power plant, which shows that the floating bodies have assumed a slanting position. By so doing, the floating bodies 7 may follow the movement of waves that lift the floating body to different extents at either end.
The floating structure is designed to be directed with one opening against the direction of the waves. The waves will thereby enter between the sidewalls 2 and 3 and pass under all the floating bodies. Preferably, the base rises from the incoming end towards the outgoing end, or is convex, causing the wave height to increase as the wave travels into the power plant. This will counter the dampening of the wave which takes place as a result of energy being extracted from the wave at the first floating bodies to be hit by the wave. The sidewalls may also be formed in a manner such as to reduce the distance between the walls from the incoming end to the outgoing end, or the sidewalls may be convex. This will also increase the wave height from the incoming to the outgoing end.
The floating structure can consist of massive walls, as shown, or it may be a trussed structure.
The floating bodies 7 may be completely filled with air or partially filled with air and water. Means may be provided for adjusting the fill-up level of water, and consequently the draught of the floating bodies.
The floating structure will be appropriately anchored by means of anchors, in a manner such that the one open end faces the prevailing wave direction. Winches may be provided on board, which slacken and take in the anchor line in order to turn the structure against the wave direction. A rudder and sensors on the rudder may be provided for this purpose, which register the wave direction and transmits signals to the winches, which in turn slacken and take in the anchor line in order to turn the structure against the waves.
The transmission of energy from the floating bodies may for instance occur by means of hydraulic cylinders that extend along the groove 12 in the guide rails and abut the ball 10, 11. The onward transmission of the hydraulic energy produced in the hydraulic cylinder, for further utilisation, will be obvious to a person skilled in the art. This may take place e.g. by hydraulic pressure being transferred via hydraulic lines to a hydraulic motor, which in turn drives an electric generator. Then the electrical energy can be transmitted to shore in a conventional manner per se.
The structure may be equipped with damping devices to dampen wave induced motions of the structure, to ensure that this moves as little as possible in the vertical direction. The wave dampers may be for instance of the type described in Norwegian patent no. 300883 or Norwegian patent no. 300884. With the structure at the greatest possible degree of rest, it becomes possible for personnel to go on board the structure to carry out maintenance or adjustments.
The floating bodies may be filled with water by opening a closing device at the top of the floating body. This is located above water, and as such is easily accessible. During this operation, the hydraulic cylinders may be locked hydraulically to prevent the floating body from moving. Once the closing device has been opened, water will flow through an opening in the base of the floating body. By maintaining the floating body at a predetermined depth of submersion, the water can be allowed to fill the floating body until the level inside the body is the same as outside. Afterwards, the closing device can be closed and the hydraulic lock released. The depth of submersion during filling of water is determined by the predominant wave frequency. If this changes, e.g. due to seasonal variations, the procedure may be repeated. The floating body is run up or down hydraulically to the desired depth of submersion and the closing device is opened in order to either fill more water or let water out. As an alternative to running the floating body up or down hydraulically, use can be made of a crane that can be permanently fixed to the floating structure. The other floating bodies can produce power in the normal manner while this operation is taking place.
Not only is it possible to increase the deflection of the floating body by increasing the depth of submersion, thus increasing the amount of energy produced; the natural frequency of the floating body is also dependent on the depth of submersion. In the case of a short wave period, the depth of submersion of the floating body will have to be reduced, as the deflection may otherwise become smaller than the wave height. In the case of a longer wave period, it is possible to use a greater depth of submersion, which will lead to an increase in the energy production.
It is also conceivable, with the present invention, to equip wave power plants with sensors to measure the wave period and automatically increase or decrease the depth of submersion as a function of the wave period. Several such U-shaped structures may be placed side by side. It will be possible to adapt the width and length of the structures to the on-site wave conditions in order to achieve the highest possible recovery of energy.

Claims

C l a i m s
1.
A wave power plant designed to float on the sea or a lake in order to produce energy, comprising a floating structure and floating bodies that move vertically relative to the floating structure, c h a r a c t e r i z e d i n that the floating bodies are designed to float awash and are connected to the floating structure by two independent supports, whereby the floating body may assume a slanting position with respect to the horizontal plane.
2.
A wave power plant according to Claim 1, c h a r a c t e r i z e d i n that the floating body is en extended body supported in two guide rails disposed at opposite ends of the floating body.
3.
A wave power plant according to Claim 2, c h a r a c t e r i z e d i n that the floating body is a cylinder, e.g. with a circular, oval or drop-shaped cross section.
4.
A wave power plant according to one of the preceding claims, c h a r a c t e r i z e d i n that the floating structure is generally U- shaped with two sidewalls and a base.
5.
A wave power plant according to Claim 4, c h a r a c t e r i z e d i n that the base rises from the incoming wave end towards the outgoing wave end.
6.
A wave power plant according to Claim 4, c h a r a c t e r i z e d i n that the base is convex. A wave power plant according to one of the preceding claims 4-6, c h a r a c t e r i z e d i n that the distance between the sidewalls diminishes from the incoming wave end to the outgoing wave end.
8.
A wave power plant according to one of the preceding claims 4-6, c h a r a c t e r i z e d i n that the sidewalls are convex.
PCT/NO2004/000173 2003-06-23 2004-06-11 Wave power station WO2004113719A1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
NO20032882 2003-06-23
NO20032882A NO20032882D0 (en) 2003-06-23 2003-06-23 Bölgekraftverk

Publications (1)

Publication Number Publication Date
WO2004113719A1 true WO2004113719A1 (en) 2004-12-29

Family

ID=27730997

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/NO2004/000173 WO2004113719A1 (en) 2003-06-23 2004-06-11 Wave power station

Country Status (2)

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NO (1) NO20032882D0 (en)
WO (1) WO2004113719A1 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2320846A1 (en) * 2008-11-25 2009-05-28 Felix Mayoral Gonzalez Platform for capturing wave energy
GB2472753B (en) * 2008-06-02 2012-11-28 Sui Kwang Chua Wave energy conversion plant
RU202538U1 (en) * 2020-11-27 2021-02-24 Федеральное государственное автономное образовательное учреждение высшего образования "Санкт-Петербургский государственный университет аэрокосмического приборостроения" Float wave power plant

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE699357C (en) * 1937-07-28 1940-11-27 Egon Linder energy generation
US3957398A (en) * 1974-09-03 1976-05-18 Harold Lloyd Wave energized pump
US4462762A (en) * 1980-03-07 1984-07-31 Narayanaswami Palani Wave action machine
WO1990004718A1 (en) * 1988-10-18 1990-05-03 Gordan Henry Turner Wave power conversion

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE699357C (en) * 1937-07-28 1940-11-27 Egon Linder energy generation
US3957398A (en) * 1974-09-03 1976-05-18 Harold Lloyd Wave energized pump
US4462762A (en) * 1980-03-07 1984-07-31 Narayanaswami Palani Wave action machine
WO1990004718A1 (en) * 1988-10-18 1990-05-03 Gordan Henry Turner Wave power conversion

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2472753B (en) * 2008-06-02 2012-11-28 Sui Kwang Chua Wave energy conversion plant
US9018785B2 (en) 2008-06-02 2015-04-28 Sui Kwang Chua Wave energy conversion plant
ES2320846A1 (en) * 2008-11-25 2009-05-28 Felix Mayoral Gonzalez Platform for capturing wave energy
WO2010061013A1 (en) * 2008-11-25 2010-06-03 Felix Mayoral Gonzalez Platform for capturing wave energy
JP2012510019A (en) * 2008-11-25 2012-04-26 ゴンザレス フェリクス マヨラル Platform for capturing wave energy
RU202538U1 (en) * 2020-11-27 2021-02-24 Федеральное государственное автономное образовательное учреждение высшего образования "Санкт-Петербургский государственный университет аэрокосмического приборостроения" Float wave power plant

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