WO2016067006A1 - Tidal power plant with air and water turbines - Google Patents

Tidal power plant with air and water turbines Download PDF

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Publication number
WO2016067006A1
WO2016067006A1 PCT/GB2015/053205 GB2015053205W WO2016067006A1 WO 2016067006 A1 WO2016067006 A1 WO 2016067006A1 GB 2015053205 W GB2015053205 W GB 2015053205W WO 2016067006 A1 WO2016067006 A1 WO 2016067006A1
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WO
WIPO (PCT)
Prior art keywords
power generation
generation system
aperture
valves
housing
Prior art date
Application number
PCT/GB2015/053205
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French (fr)
Inventor
Eric Williams
Original Assignee
Eric Williams
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Filing date
Publication date
Application filed by Eric Williams filed Critical Eric Williams
Publication of WO2016067006A1 publication Critical patent/WO2016067006A1/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
    • F03B13/26—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 tide energy
    • F03B13/266—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 tide energy to compress air
    • 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 pictured embodiment of the invention provides a device for power generation from tides.
  • Figure 1 shows an isometric view of an embodiment of the invention comprising one large bell and six smaller bells.
  • Figure 2 shows a cut-away isometric view of the embodiment shown in figure 1 with the roofs of the bells removed.
  • Figure 3 shows a side view of the embodiment shown in figure 1.
  • Figure 4 shows a top view of the embodiment shown in figure 1.
  • Figure 5 shows an isometric view of a large bell forming part of an embodiment as shown in figure 1 .
  • Figure 6 shows an isometric view of a small bell forming part of an embodiment as shown in figure 1 .
  • Figure 7 shows a cross-section through the large bell as shown in figure 5 in use, in a condition in which the tide is rising. Flows through the turbines on the sides and roof of the bell are shown.
  • Figure 8 shows a cross-section through the large bell similar to that in figure 7, in the condition that the tide is falling.
  • Figure 9 shows a typical profile of power generation in use for the embodiment as shown in figures 1 to 8.
  • an embodiment of a device for tidal electrical power generation (referred to as 'power generation' herein) is configured to rest on the bed (referred to herein as the 'seabed') of a tidal watercourse such as a bay, river or inlet.
  • the device 10 comprises one or more bells 12, 14 each configured to be anchored to the seabed and comprising: A wall 16 and a roof 18 to define an interior space 20, one or more water turbines 22 provided in the lower half of the wall 16 and open to an aperture 24 through the wall to provide a fluid flow pathway 26 through the aperture and the turbine, one or more air turbines 32 provided in the roof 18 and open to an aperture 34 through the roof to provide a fluid flow pathway 36 through the aperture and the turbine, a generator driven by each turbine, a power connection 38 from each turbine to carry power from the turbine, wherein the water turbines are bidirectional venturi turbines.
  • the air turbines are also bidirectional venturi turbines.
  • the device comprises at least one large bell and at least one smaller bell.
  • the apertures on at least the small bell(s) are each provided with a valve to control flow through the aperture.
  • the valve may comprise a controllable check valve configured to allow flow into the bell and control flow out from the bell in response to a control signal.
  • the device is configured to stand on the seabed in a tidal region, and is sized such that at high tide the roof of the bell is above the water level. Referring to figure 7, in use, as the tide comes in and the external water level 62 rises, water enters through the apertures 24 and through the turbine 22 and the water level 60 within the bell rises. The walls restrict water flow into the bell, creating a fast-moving current through the Venturi water turbine.
  • the flow restriction means that the water level in the bell is lower than outside, as it takes longer to fill. This will aid in maintaining more stable electrical generation.
  • the rate of outflow of water through the apertures 24 is controlled by the valves, thereby controlling the rate of power generation.
  • the device may therefore store water until power is needed and thereafter generate power at an adjustable rate.
  • the turbines 22 comprise a water flow venturi shroud 70 having an inlet profile, a valve shown in the closed position as 72 in figure 6, and positioned in an aperture 24 through the wall of the bell.
  • the air turbines 32 comprise an air flow venturi shroud 80 having a central portion 82 to house the turbine.
  • the apertures 24 and turbines 22 are provided close to the bottom of the interiorspace 20 so as to allow the space to drain when the tide is out.
  • an aperture and turbine is provided within the lower 25% of the height of the wall.
  • the bells comprise an internal support structure as shown in figure 2, comprising a plurality of upright supports 40 to support radial struts 42 and circumferential struts 44, to support a roof material 46.
  • the walls comprise a masonry or concrete structure, for example as shown as stacked blocks 48, though the wall may also comprise an earth bank or an excavation, for example in the bank of a tidal inlet.
  • the generators driven by the air turbines 32 are shown as being connected by power connections 38 to a main power line 52 that links the device to the shore, on the large bell via a central connection point 50.
  • the device comprises one or more larger bells 1 and one or more smaller bells 14, in this embodiment a single central larger bell and six smaller bells. It will be understood that the invention is not limited to this configuration and that according to the embodiment, the device may comprise a single large or a single small bell, a plurality of large bells or of small bells, or a combination of a number of large bells and a number of small bells.
  • bells it is advantageous to select the number and size of the bells to suit the location, the tidal range and the need for a controllable rate of release of water and hence rate of power generation when the tide is out.
  • larger bells provide more water storage and a greater flow rate through each turbine than smaller bells, but require a more robust construction.
  • Smaller bells have lower water capacity so provide a lower power generation rate per bell when the tide is out, but provide more controllable usage in the sense that some bells may be emptied to provide power generation while others are conserved.
  • the rate of flow through the turbine determines the rotation speed, so when the tide is out and the device is running on stored water, the turbines will rotate faster when the bell is full than when it is part empty, giving a higher power output when flow out of the bell is started than later in operation.
  • apertures and the turbine venturi dimensions are chosen such that in use the rate of flow into the bell as the tide rises is limited, such that the water level inside the bell is below that of the rising tide. In this way the limitation controls the rate of flow and hence the rate of power generation as the bell fills.
  • the flow control valve may be operated to control the flow through the apertures to control the rate of power generation.
  • valves in the water flow pathway into the small bell are configured to be controlled to control both the rate of water inflow when the tide is rising and the rate of water outflow when the tide is falling.
  • the small bells may be used to smooth out the variation in power generation from the large bell by adding their power generation to that of the large bell.
  • the valve on a small bell may be kept closed as the tide rises, while that on a large bell (if present) is open to allow the large bell to generate power; the valve on the small bell may be opened as the tide is nearly at its high point to allow water into the empty small bell, to boost power generation.
  • the same procedure in reverse may be used to boost power generation at low tide when the large bell is nearly empty.
  • the system of the present invention is a "two-phase" system, wherein during phase one, power is generated by tidal flow in and out of the large bell via the apertures containing the water turbines. Water flow through the turbines generates power as previously explained.
  • phase two power is generated by selectively opening the valves controlling the water apertures, as follows.
  • the valves controlling the water apertures in the small bell(s) are open, allowing tidal flow into the small bell(s). At high tide, these valves are closed to retain the water within the small bell(s). At low tide, these valves are opened, thus allowing the water to flow out of the small bell(s) via the water turbines in the apertures, to generate power. Therefore, the two phase system provides a continuous power output that can be controlled independently and which is not dependent on the tide.
  • valves controlling the water apertures on the bells are configured to be controllable independently. In this way power generation at low tide in controllable by controlling the valves to allow water to exit some or all of the bells, for example together or in sequence as power is required.
  • valves are provided only on the smaller bells, as these will contain less water than the larger bell, and hence require a less robust construction to retain the water when full and the tide is low.
  • the embodiment of figures 1 to 8 may have a range of dimensions to suit the site in which it is to be installed.
  • the large bell may have a diameter in the range 20m to 100m, for example 60m, and a height in the range 4m to 12m, for example 10m.
  • the small bell may have a diameter in the range 5m to 40m, for example 20m, and a height the same as that of the large bell, in the range 4m to 12m, for example 10m.
  • Example calculations for the water flow in the embodiment are given below.
  • Volume available to be filled Area (m 2 ) x Height (m)
  • Volume available to be filled Area (m 2 ) x Height (m)
  • the power generation profile of the embodiment in use is illustrated, showing timing of operation of valves on the small bells to control power generation, and showing that by control of timing of the opening and closing of the valves, power generation by the small bells may be controlled to smooth out the troughs in power generation by the large bell at the extremes of the tide.
  • the invention has been described by way of examples only and it will be appreciated that variation may be made to the above-mentioned embodiments without departing from the scope of invention.

Abstract

A power generation system (10) comprising a housing (12) having an internal chamber (20) is disclosed. The system also comprises a first aperture (24) in the housing in communication with the chamber (20), and a water turbine (22) configured to receive water flow passing through the first aperture (24). The system further comprises a second aperture (34) in the housing (12) in communication with the chamber (20), and an air turbine (32) configured to receive air flow passing through the second aperture (34).

Description

TIDAL POWER PLANT WITH AIR AND WATER TURBINES
Field of Invention
The pictured embodiment of the invention provides a device for power generation from tides.
Brief Description of Figures
Figure 1 shows an isometric view of an embodiment of the invention comprising one large bell and six smaller bells.
Figure 2 shows a cut-away isometric view of the embodiment shown in figure 1 with the roofs of the bells removed.
Figure 3 shows a side view of the embodiment shown in figure 1.
Figure 4 shows a top view of the embodiment shown in figure 1.
Figure 5 shows an isometric view of a large bell forming part of an embodiment as shown in figure 1 .
Figure 6 shows an isometric view of a small bell forming part of an embodiment as shown in figure 1 .
Figure 7 shows a cross-section through the large bell as shown in figure 5 in use, in a condition in which the tide is rising. Flows through the turbines on the sides and roof of the bell are shown.
Figure 8 shows a cross-section through the large bell similar to that in figure 7, in the condition that the tide is falling.
Figure 9 shows a typical profile of power generation in use for the embodiment as shown in figures 1 to 8. l Detailed Description of the Embodiment
Referring to figures 1 to 8, an embodiment of a device for tidal electrical power generation (referred to as 'power generation' herein) is configured to rest on the bed (referred to herein as the 'seabed') of a tidal watercourse such as a bay, river or inlet.
The device 10 comprises one or more bells 12, 14 each configured to be anchored to the seabed and comprising: A wall 16 and a roof 18 to define an interior space 20, one or more water turbines 22 provided in the lower half of the wall 16 and open to an aperture 24 through the wall to provide a fluid flow pathway 26 through the aperture and the turbine, one or more air turbines 32 provided in the roof 18 and open to an aperture 34 through the roof to provide a fluid flow pathway 36 through the aperture and the turbine, a generator driven by each turbine, a power connection 38 from each turbine to carry power from the turbine, wherein the water turbines are bidirectional venturi turbines.
In this embodiment the air turbines are also bidirectional venturi turbines.
In some versions of this embodiment the device comprises at least one large bell and at least one smaller bell. In this embodiment the apertures on at least the small bell(s) are each provided with a valve to control flow through the aperture. The valve may comprise a controllable check valve configured to allow flow into the bell and control flow out from the bell in response to a control signal. In this way the device is configured to stand on the seabed in a tidal region, and is sized such that at high tide the roof of the bell is above the water level. Referring to figure 7, in use, as the tide comes in and the external water level 62 rises, water enters through the apertures 24 and through the turbine 22 and the water level 60 within the bell rises. The walls restrict water flow into the bell, creating a fast-moving current through the Venturi water turbine. The flow restriction means that the water level in the bell is lower than outside, as it takes longer to fill. This will aid in maintaining more stable electrical generation.
As this happens air is forced out through the aperture 34 in the roof and turbine 32. Specifically, as the water fills the bell, the air inside is displaced, causing it to escape through the venturi turbines in the roof. Power is therefore generated by the generators driven by each of the water turbines and the air turbines. Referring to figure 8, when the tide falls, water exits through the aperture 24 and the turbine 22, now running in the reverse direction, and the water level 60 within the bell falls. The walls restrict water flow out of the bell, creating a fast-moving current through the venturi water turbine. The flow restriction means that the water level in the bell is higher than outside, as it takes longer to empty. This will aid in maintaining more stable electrical generation.
As this happens, air is drawn in through the aperture 34 and the turbine 32, also now running in the reverse direction. Specifically, as the water leaves the bell, the vacuum is created inside, causing air to enter through the venturi turbines in the roof. Power is again generated by the generators driven by each of the water turbines and the air turbines. In this embodiment the water apertures on at least the small bells are controlled by valves, so as to control the rate of flow through the apertures.
In use, as the tide falls, the rate of outflow of water through the apertures 24 is controlled by the valves, thereby controlling the rate of power generation. The device may therefore store water until power is needed and thereafter generate power at an adjustable rate.
The turbines 22 comprise a water flow venturi shroud 70 having an inlet profile, a valve shown in the closed position as 72 in figure 6, and positioned in an aperture 24 through the wall of the bell. The air turbines 32 comprise an air flow venturi shroud 80 having a central portion 82 to house the turbine.
The apertures 24 and turbines 22 are provided close to the bottom of the interiorspace 20 so as to allow the space to drain when the tide is out. In this embodiment an aperture and turbine is provided within the lower 25% of the height of the wall.
The bells comprise an internal support structure as shown in figure 2, comprising a plurality of upright supports 40 to support radial struts 42 and circumferential struts 44, to support a roof material 46. The walls comprise a masonry or concrete structure, for example as shown as stacked blocks 48, though the wall may also comprise an earth bank or an excavation, for example in the bank of a tidal inlet. In the embodiment shown the generators driven by the air turbines 32 are shown as being connected by power connections 38 to a main power line 52 that links the device to the shore, on the large bell via a central connection point 50.
In some embodiments the device comprises one or more larger bells 1 and one or more smaller bells 14, in this embodiment a single central larger bell and six smaller bells. It will be understood that the invention is not limited to this configuration and that according to the embodiment, the device may comprise a single large or a single small bell, a plurality of large bells or of small bells, or a combination of a number of large bells and a number of small bells.
It is advantageous to select the number and size of the bells to suit the location, the tidal range and the need for a controllable rate of release of water and hence rate of power generation when the tide is out. For example, larger bells provide more water storage and a greater flow rate through each turbine than smaller bells, but require a more robust construction. Smaller bells have lower water capacity so provide a lower power generation rate per bell when the tide is out, but provide more controllable usage in the sense that some bells may be emptied to provide power generation while others are conserved.
In some embodiments the rate of flow through the turbine determines the rotation speed, so when the tide is out and the device is running on stored water, the turbines will rotate faster when the bell is full than when it is part empty, giving a higher power output when flow out of the bell is started than later in operation.
In this embodiment the apertures and the turbine venturi dimensions are chosen such that in use the rate of flow into the bell as the tide rises is limited, such that the water level inside the bell is below that of the rising tide. In this way the limitation controls the rate of flow and hence the rate of power generation as the bell fills.
In this embodiment, having a flow control valve in the fluid pathway through the aperture, the flow control valve may be operated to control the flow through the apertures to control the rate of power generation.
In this embodiment the valves in the water flow pathway into the small bell are configured to be controlled to control both the rate of water inflow when the tide is rising and the rate of water outflow when the tide is falling. In this way the small bells may be used to smooth out the variation in power generation from the large bell by adding their power generation to that of the large bell. For example, the valve on a small bell may be kept closed as the tide rises, while that on a large bell (if present) is open to allow the large bell to generate power; the valve on the small bell may be opened as the tide is nearly at its high point to allow water into the empty small bell, to boost power generation. The same procedure in reverse may be used to boost power generation at low tide when the large bell is nearly empty.
In other words, the system of the present invention is a "two-phase" system, wherein during phase one, power is generated by tidal flow in and out of the large bell via the apertures containing the water turbines. Water flow through the turbines generates power as previously explained. During phase two, power is generated by selectively opening the valves controlling the water apertures, as follows.
As the tide rises, the valves controlling the water apertures in the small bell(s) are open, allowing tidal flow into the small bell(s). At high tide, these valves are closed to retain the water within the small bell(s). At low tide, these valves are opened, thus allowing the water to flow out of the small bell(s) via the water turbines in the apertures, to generate power. Therefore, the two phase system provides a continuous power output that can be controlled independently and which is not dependent on the tide.
In some embodiments the valves controlling the water apertures on the bells are configured to be controllable independently. In this way power generation at low tide in controllable by controlling the valves to allow water to exit some or all of the bells, for example together or in sequence as power is required.
In some embodiments with both larger and smaller bells, valves are provided only on the smaller bells, as these will contain less water than the larger bell, and hence require a less robust construction to retain the water when full and the tide is low. The embodiment of figures 1 to 8 may have a range of dimensions to suit the site in which it is to be installed. The large bell may have a diameter in the range 20m to 100m, for example 60m, and a height in the range 4m to 12m, for example 10m. The small bell may have a diameter in the range 5m to 40m, for example 20m, and a height the same as that of the large bell, in the range 4m to 12m, for example 10m. Example calculations for the water flow in the embodiment are given below.
Large Bell
Bell Diameter = 60 m
Change in tidal level = 8m
Volume available to be filled = Area (m2) x Height (m)
= 22 619m3
= 22 619 000 Litres
Over a four hour period, while the Bell is being filled:
Flow rate = Volume Filled (Litres) / Time (Sec)
= 22 619 000 / (4x60x60)
= 1 570 Litres/Sec
Small Bell
Bell Diameter = 20 m
Change in tidal level = 8m
Volume available to be filled = Area (m2) x Height (m)
= 2 513m3
= 2 513 000 Litres
Over a two hour period, while the valves are open:
Flow rate = Volume Filled (Litres) / Time (Sec)
= 2 513 000 / (2x60x60)
= 349 Litres/Sec
In an arrangement of 8 Small Bells
Combined flowrate = 8 x 349
= 2 792 Litres/Sec Total for the
Arrangement
Flowrate = 1 570 + 2 792
= 4 362 Litres/Sec
Referring to figure 9, the power generation profile of the embodiment in use is illustrated, showing timing of operation of valves on the small bells to control power generation, and showing that by control of timing of the opening and closing of the valves, power generation by the small bells may be controlled to smooth out the troughs in power generation by the large bell at the extremes of the tide. The invention has been described by way of examples only and it will be appreciated that variation may be made to the above-mentioned embodiments without departing from the scope of invention. With respect to the above description then, it is to be realised that the optimum dimensional relationships for the parts of the invention, to include variations in size, materials, shape, form, function and manner of operation, assembly and use, are deemed readily apparent and obvious to one skilled in the art, and all equivalent relationships to those illustrated in the drawings and described in the specification are intended to be encompassed by the present invention.
Therefore, the foregoing is considered as illustrative only of the principles of the invention. Further, since numerous modifications and changes will readily occur to those skilled in the art, it is not desired to limit the invention to the exact construction and operation shown and described, and accordingly, all suitable modifications and equivalents may be resorted to, falling within the scope of the invention.

Claims

1. A power generation system comprising a housing having an internal chamber, a first aperture in the housing in communication with the chamber, a water turbine configured to receive water flow passing through the first aperture, a second aperture in the housing in communication with the chamber, and an air turbine configured to receive air flow passing through the second aperture.
2. A power generation system as claimed in claim 1 , wherein the first aperture is located within the lower 25% of the height of the housing.
3. A power generation system as claimed in claim 1 or claim 2, wherein the housing comprises an enclosing wall and a roof which together define the internal chamber.
4. A power generation system as claimed in claim 3, wherein the enclosing wall is substantially cylindrical.
5. A power generation system as claimed in claim 3 or claim 4, wherein the first aperture is located in the enclosing wall.
6. A power generation system as claimed in any of claims 3 to 5, wherein the second aperture is located in the roof.
7. A power generation system as claimed in any preceding claim, comprising a valve for controlling the rate of flow through an aperture.
8. A power generation system as claimed in claim 7, wherein the valve is a check valve.
9. A power generation system as claimed in claim 7 or claim 8, comprising a valve located in an aperture.
10. A power generation system as claimed in any of claims 7 to 9, comprising a plurality of valves, each for controlling the rate of flow through a respective aperture.
1 1 . A power generation system as claimed in claim 10, wherein the valves are independently controllable.
12. A power generation system as claimed in claim 1 1 , wherein the valves can be configured to control water flow by opening or closing simultaneously.
13. A power generation system as claimed in claim 1 1 or claim 12, wherein the valves can be configured to control water flow by opening or closing each valve in a sequence.
14. A power generation system as claimed in any of claims 1 1 to 13, wherein, in use, the valves are selectively operable to control water flow in and out of the chamber independently of the tide to control the rate of power generation.
15. A power generation system as claimed in claim 13, wherein the valve is operable to provide a substantially constant level of power generation independently of the tide.
16. A power generation system as claimed in any preceding claim, comprising a water turbine and/ or an air turbine in the form of a bidirectional venturi turbine.
17. A power generation system as claimed in any preceding claim, wherein each chamber comprises an internal support structure.
18. A power generation system as claimed in claim 17, wherein the internal support structure comprises a plurality of upright supports.
19. A power generation system as claimed in claim 16 or claim 17, wherein the internal support structure comprises a plurality of radial struts.
20. A power generation system as claimed in any of claims 17 to 19, wherein the internal support structure comprises a plurality of circumferential struts.
21 . A power generation system as claimed in any preceding claim, wherein the housing comprises masonry or concrete.
22. A power generation system as claimed in any preceding claim, wherein the housing comprises an earth bank or excavation.
23. A power generation system as claimed in any preceding claim, adapted to be secured to the sea bed.
24. A power generation system as claimed in any preceding claim, comprising a plurality of water turbines configured to receive water flow from an aperture in the housing.
25. A power generation system as claimed in claim 24, comprising a plurality of water turbines, each configured to receive water flow from a respective aperture in the housing.
26. A power generation system as claimed in claim 24 or claim 25, comprising one or more water turbines located in a respective aperture in the housing.
27. A power generation system as claimed in any preceding claim, comprising a plurality of air turbines configured to receive air flow from an aperture in the housing.
28. A power generation system as claimed in claim 27, comprising a plurality of air turbines, each configured to receive air flow from a respective aperture.
29. A power generation system as claimed in claim 27 or claim 28, comprising one or more air turbines located in a respective aperture in the housing.
30. A power generation system as claimed in any preceding claim, comprising a plurality of first apertures in the housing, in communication with the chamber.
31 . A power generation system as claimed in any preceding claim, comprising a plurality of second apertures in the housing, in communication with the chamber.
32. An array of power generation systems as claimed in any preceding claim.
33. An array as claimed in claim 32, comprising at least two housings of different sizes.
34. An array as claimed in claim 32 or claim 33, comprising a plurality of power generation systems in proximity to each other.
35. An array as claimed in claim 34, comprising a first larger power generation system located centrally with respect to a plurality of smaller power generation systems.
36. An array as claimed in any of claims 32 to 35, wherein the outputs of the power generation systems are electrically connected.
37. An array as claimed in any of claims 32 to 36 when appendant to any of claims 7 to 15, wherein, in use during a rising tide, the one or more valves in the additional housings are closed and the one or more valves in the housing are open.
38. An array as claimed in claim 37, wherein, in use during a low tide, one or more valves in a first power generation system are open and one or more valves in a second power generation system are closed.
39. An array as claimed in any of claims 32 to 36 when appendant to any of claims 7 to 15, wherein only the additional housings comprise one or more valves and, in use during a rising tide, said one or more valves are closed.
40. An array as claimed in claim 39, wherein, in use around a high tide, the one or more valves in the additional housings are opened.
41 . An array as claimed in claim 39 or claim 40, wherein, in use during a falling tide, the one or more valves in the additional housings are closed.
42. An array as claimed in claim 41 , wherein, in use around a low tide, the one or more valves in the additional housings are opened.
43. A power generation system substantially as herein described and with reference to Figures 1 to 8.
PCT/GB2015/053205 2014-10-27 2015-10-26 Tidal power plant with air and water turbines WO2016067006A1 (en)

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RU2717424C1 (en) * 2019-03-12 2020-03-23 Федеральное государственное автономное образовательное учреждение высшего образования "Уральский федеральный университет имени первого Президента России Б.Н. Ельцина" Automatic tidal hydroelectric power plant with water reservoir
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GB2614102A (en) * 2021-05-23 2023-06-28 Frederick Gorin Von Grozny James Hermetic cap tidal pulse responder

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CN107542068A (en) * 2017-09-04 2018-01-05 合肥工业大学 A kind of offshore water V-type ocean current power generation field device
RU2717424C1 (en) * 2019-03-12 2020-03-23 Федеральное государственное автономное образовательное учреждение высшего образования "Уральский федеральный университет имени первого Президента России Б.Н. Ельцина" Automatic tidal hydroelectric power plant with water reservoir
WO2021096373A3 (en) * 2019-11-13 2022-03-10 Alvarez Jarish An environmentally-friendly system for the generation of electricity by the water and air flow movement due to the energy of the tides, with the capacity of expanding into multiple stages and controlling its own limits in accordance with demand
GB2614102A (en) * 2021-05-23 2023-06-28 Frederick Gorin Von Grozny James Hermetic cap tidal pulse responder

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