CA2241686A1 - Multiple tidal pumped storage power generation arrangement and method of constructing the same at tidal power site - Google Patents
Multiple tidal pumped storage power generation arrangement and method of constructing the same at tidal power site Download PDFInfo
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- CA2241686A1 CA2241686A1 CA002241686A CA2241686A CA2241686A1 CA 2241686 A1 CA2241686 A1 CA 2241686A1 CA 002241686 A CA002241686 A CA 002241686A CA 2241686 A CA2241686 A CA 2241686A CA 2241686 A1 CA2241686 A1 CA 2241686A1
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- 238000010248 power generation Methods 0.000 title claims abstract description 69
- 238000000034 method Methods 0.000 title claims description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 28
- 230000003028 elevating effect Effects 0.000 abstract 1
- 238000010276 construction Methods 0.000 description 7
- 238000005086 pumping Methods 0.000 description 4
- 230000003203 everyday effect Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000013535 sea water Substances 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02B—HYDRAULIC ENGINEERING
- E02B3/00—Engineering works in connection with control or use of streams, rivers, coasts, or other marine sites; Sealings or joints for engineering works in general
- E02B3/04—Structures or apparatus for, or methods of, protecting banks, coasts, or harbours
-
- 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
- F03B13/268—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 making use of a dam
-
- 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
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Combustion & Propulsion (AREA)
- Oceanography (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Environmental & Geological Engineering (AREA)
- Ocean & Marine Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Other Liquid Machine Or Engine Such As Wave Power Use (AREA)
Abstract
A multiple tidal pumped storage power generation arrangement (3) free of sluices comprising a plurality of basins (4,8,9,...) for ebb tide power generation mode and a plurality of basins (5,6,7,...) for flood tide power generation mode. The arrangement is constructed at a tidal bay site (A) while keeping a natural tidal range by dividing the bay into a tideway (1) extending from a mounth (A1-A2) to a bottom (A3) thereof and at least one waterway (2); and building both the basins in the waterway. The basins are adjacent to one another and each enclosed by barrages (11) at the tideway side and at mutually adjacent sides and installed with a caisson (12) mounted with a pump-turbine (13) at the tideway side. By elevating the water level of the basins for ebb tide generation mode up to an upper limit and lowering the water level of the basins for flood tide generation mode to a lower limit at nighttime by harnessing the nighttime electric power of grid, it is possible to generate, at daytime, power at each maximum output of the turbines continually for 11 to 12 hours.
Description
SPECIFICATION
MULTIPLE TIDAL PUMPED STORAGE POWER GENERATION ARRANGEMENT
AND METHOD OF CONSTRUCTING THE SAME AT TIDAL POWER SITE
This invention relates to a multiple tidal PumI)ed storaee Power generation arrangement, free of sluices, harnessing both a pumped storage power and a tidal power, and to a method of constructing the same at a tidal bay site capable of tidal power generation.
Hitherto, a tidal power generation plant has been run using a single basin at one bay, for e~r~mp1e, as in the Severn Barrage Project,U.K. (General Report, Energy Paper Number 57, Dept. of CA 02241686 1998-06-2~
-multiplied by second power of the mean tide range, and even if the size of a basin is made larger, the mean tide range at the barrage site is sma11er, as a result of which the output energy is not so much increased for that size enlargement.
It is a further problem that the mz~srirnum output of turbines is determined by a m~rimum tide range occuring at spring tide, but the output of the turbines at neap tide is reduced to about l/4 the mz~imum output.
Still further problem consists in the troublesome manipulation of sluices. For instance, at ebb tide generation mode, the manipulation is repeated twice a day, wherein the sluices are opened to fill flood tide to the basin every one power generation is fini.~hed and the sluices are closed directly before ebb tide begins.
The sluices are not only laborious to manipulate, but also make the mean tide range small and act to attenuate the output energy because the sluices are closed in haste while the water level of the basin is not fully elevated when the ebb tide begins. Moreover, the construction cost of sluices is more expensive than that of barrages, and consequently, it is desirable that sluices be dispensed with.
In order to avoid the foregoing problems, the invention is designed to provide a multiple tidal pumped storage power generation arrangement free of sluices by dividing a bay r~nging from its mouth to its bottom into two or three watelw~y~, one of which is used for a tideway and the other of which is used for sluice-free basins for power generation. The basins are built each by enclosing a basin with a barrage that extends along the tideway and a barrage that extends CA 02241686 1998-06-2~
squarely to the tideway, and installing a caisson mounted with a pump-turbine to the former barrage so as to face the tideway. One half of the basins is for ebb tide power generation mode and the other half of the basins is for flood tide power generation mode.
Accordingly, this inv~ ion is designed to provide a multiple tidal pumped storage power generation arrangement keeping a natural tidal range by constructing a power generation arrangement for a single basin and ebb tide generation mode and then, a power generation arrangement for a single basin and flood tide generation mode while operating the previous power generation arrangement, or vice versa, thus constructing power generation arrangements one after another in sequence to ultimately complete the multiple tidal pumped storage power arrangement composed of a plurality of power generation arrangements and ~ttslinin~ a mzl~imum tidal energy.
According to one aspect, the present I nv~lltion resides in a method of constructing a multiple tidal pumPed storage power generation arrangement, which comprises dividing a bay site capable of tidal power generation into at least two watel way~ one of which is a tideway extending from a mouth to a bottom of the bay and the other of which is a space for at least one series of basins for power generation keeping a natural tidal range; surrolm-1ing each of the basins with both barrages at the tideway side and at mutually adjacent sides and inst~lling a caisson internally mounted with a pump-turbine at the tideway side, the basins being grouped into at least one basins operating at a single basin and ebb tide generation mode and at least one basins operating at a single basin and flood .. , ~
tide generation mode.
According to another aspect of this inv~ ioni a tidal pumped storage power generation arrangement is providedj which cL~ JLises at least one basins for a single basin and ebb tide generation mode and at least one basins for a single basin and flood tide generation mode, installed adjacent to one another so as to face a tideway of a tidal bay site, wherein the basins are operated at nighttime in such a manner that the water level of the former basins is elevated up to a specified level which is higher than a m~rimum level at-spring tide by nighttime electric power of grid, thus m~rimi~ing a water head of the turbines and the water level of the latter basins is lowered to a specified level which is lower than the datum level by ni~httime electric power of grid, thus m~rimi7in~ a water head of the turbines, whereas at daytime, both the basins perform tidal pumped storage power generation by use of the water heads at an efflciency of 100% or more, whereby a contilluous power generation is enabled at a m~imum output of each turbine for 11 to 12 hours.
In a plerel~ed embodiment, the bay site is divided into two or .
three w~telw~y:~. The one waterway (an example of two watelway~) or central w~telway (an example of three watelw2lys) is used for the tideway to keep a natural tidal range. The rest of wat~l w~y~ is used for a plurality of power generation arramgements each having a relatively smail-scale output (e.g.,on the order of one million kW).
In dividing the bay site into watelways, first, for example, the bottom of a bay is applied to one basin, which iS, in turn, surrounded by barrages and a caisson mounted with a pump-turbine to construct one tidal power generation arrangement. Then, a next basin ' CA 02241686 1998-06-2~
is constructed likewise into a next tidal power generation arrangement, while rl-nning the first tidal power generation arrangement. Ultim~tely~ the division into the watelways: is completed and a multiple tidal pumped storage power arrangement is thus completed.
That is to say, a pump-turbine is mounted within the caisson and installed to face the tideway, with its electric power line having input and output connected to the land electric grid. When the water level of the tideway becomes higher than the mean sea level, the water level of the basin is elevated to a specified m~rimum level (e.g., a mzl,rimum level at spring tide), irrespective of spring tide and neap tide by pumping operation by the use of nighttime electric power without using sluices. At daytime conventional operation for ebb tide power generation is possible at a m~lrimum output even at neap tide.
This is called a single basin and ebb tide pumped storage power generation arrangement.
Next, a single basin and flood tide pumped storage power generation arrangement will be constructed. A pump-turbine is installed at a deeper place than the ebb tide power generation ~
arrangement since the the water level of the basin is used at a lower level than the mean sea level. The ebb tide power generation arrangement and the flood tide power generation arrangement are not necessarily installed adjacent to each other, but the position relation of the both may be chosen optionally.
The flood tide pumped storage power generation arrangement is operated so that when the level of the tideway becomes lower than the mean sea level, the basin level is lowered to a specified limit which is lower than'the datum level by r1mnine the~pump by nighttime electric power of the grid. The lowering degree depends on the depth at which the pump-turbine is disposed, and consequently, the pump-turbine is disposed at a deepest possible place (30 meter or less beneath the mean sea level).
By combining the basin of the ebb tide pumped storage power generation arrangement called "higher pond" and the basin of the flood tide pumped storage power generation arr~ngement caliad "lower pond", it is possible to generate, at daytime, electric power keeping each m~ mum output continually for ll to 12 hours. Here, the water levels of the higher pond and the lower pond are made sufficiently higher and lower, respectively, than the natural tidal level by nighttime pumping operation, so that the heads due to the turbines a~e larger than natural heads, which results in an increase of artificial mean tidal range and accordingly, a~l~inil~g a generating efficiency of l007~ or more. The combin~tion of daytime tidal energy portion (kWh) in addition to the pumped storage ener8y portion enables to obtain an annual output (kWh) of'about two times the purchased niEhttime energy (kWh). One reason why the generating efflciency is impluved is that the pumps are operated at a .~m~11er head (for example, when lowering the water~level of the lower pond at nighttime, the water is evacuated from the pond to the sea with the pump at a lower level than the mean sea level by talcing advantage of the peLÇu~ ance that the ~m~11er is the head of the pump, the larger the flow rate under the same shaft power condition).
In the ebb tide power ~generation arrangementi when the water . ~ . ' CA 02241686 1998-06-2~
level of the tideway becomes higher than that of the higher pond at nighttime when the pumps are not used, the rotary shafts of the turbines are released to free rotation, instead of using sluices, to assist sea water in refilling into the higher pond thereby to enable to reduce the perchased nighttime power.
The preferred embodiments of this invention will be hereinafter described in more detail with reference to the accompanying dl~willgs, in which:
Fig. 1 is a dia~ tic plan view of a multiple tidal pumped storage power plant constructed at a tidal bay site;
Fig. 2 is a transverse sectional view of the plant of Fig. 1 taken along 1~ line of Fig. 1 showing the relation between the depth of the bay and the inst~ tion depth of the pump-turbines, and the upper and lower limits of the water levels of respective basins at ebb tide pumped storage power generation mode and at flood tide pumped storage power generation mode, respectively;
Fig. 3 is a transverse sectional view taken along m-m line of Fig. 1 showing the slope of the mean tidal range from the mouth to the bottom of the bay.
Referring to Fig. 1, a bay A as a tidal power site faces the ocean B and extends from a mouth Al-AZ of the bay to a bottom A3 of the bay. The mean tidal range (the dirrerence between ebb tide and flood tide through spring to neap) is gradually increased from the mouth toward the bottom of the bay A in a slope of 34 to 35 as shown in Fig. 3 relative to a datum horizontal line 33. The bay A is divided into a tideway 1 extending at the bay shore side of Al to A3 CA 02241686 1998-06-2~
and a waterway 2 extending at the bay shore side of A2 to A3, where a series of basins 4 to 9 for power generation are adapted to be built in sequence thereby to l11tim~tely form a multiple tidal pumped storage power generation arrangement 3.
Here, the basins 4, 8, 9 are used for ebb tide power generation mode and the basins 5, 6, 7 are used for ~ood tide power generation mode.
Each basin is enclosed by barrages 11 and the bay shore of A2-A3, and the barrage 11 facing the tideway 1 has a caisson 12 mounted with a pump-turbine 13.
In one ~x~mple of a bay A as shown in Fig. 2, its sea bottom (dotted line) is shallow near the mouth of the bay and is deeper at the middle place of the bay as shown at A4. A deep bay place that has a depth of 30 meter or more from the mean sea level is not suited for tidal power generation and is advantageously used for a tideway.
This is because the construction cost of barrages is proportional to the second power of the depth. Taking the fact that a deep place of the bay is not always its center place into accounti it is better to make a n~luwest possible tideway 1 by linking deeper places of the bay, which enables to allocate a greater area to the basins.
At flood tide power generation mode, it is desirable that the pump-turbines 13 of the basins 5,6,7 be installed at a deeper position 25 of within 30 meter below the mean sea level as shown in Fig. 2, and thus it is possible to construct flood tide power generation arrangements in series, insofar as a balance in the power output (kW) between ebb tide and flood tide power generation modes is eventually kept.
CA 02241686 1998-06-2~
The operation of the tidal pumped storage power generation arrangement of the invention will be e~l~ined by way of example of one higher pond (e.g.,4) and one lower pond (e.g.,5):
In the ebb tide power generation arrangement, the water level of the basin 4 is, at nighttime, elevated to a m~imum specffled level 22 (for example, Z meter above the mean sea level 21) by pumping operation irrespective of spring tide and neap tide, whereas at daytime power is generated to produce a turbine power (kW) such that the water level of the basin 4 may be changed from 22 to 21.
In the flood tide power generation arrangement, the water level of the basin 5 is lowered to a minimum specified water level 23 (e.g.,2 X Z meter below the mean sea level 21) by pumping operation at nighttime irrespective of spring tide and neap tide, whereas at daytime, power is generated to produce such a turbine power (kW) that the water level of the basin 5 may be changed from 23 to 21. Here, the reference numeral 24 design~tes a datum depth, which is a depth (Z meter) from the mean sea level 21 at a minimum water level at spring tide.
As described above, the invention has advantages what follow:
1. Even when a plurality of tidal pumped storage power generation arrangements are constructed in series, the provision of the tideway extending from a mouth to bottom of a bay enables to keep a natural tidal range. Consequently, it is possible to construct many relatively small-sized tidal pumped storage power plants, with the result that a m~rimum energy of the tidal power site can be extracted.
CA 02241686 1998-06-2~
MULTIPLE TIDAL PUMPED STORAGE POWER GENERATION ARRANGEMENT
AND METHOD OF CONSTRUCTING THE SAME AT TIDAL POWER SITE
This invention relates to a multiple tidal PumI)ed storaee Power generation arrangement, free of sluices, harnessing both a pumped storage power and a tidal power, and to a method of constructing the same at a tidal bay site capable of tidal power generation.
Hitherto, a tidal power generation plant has been run using a single basin at one bay, for e~r~mp1e, as in the Severn Barrage Project,U.K. (General Report, Energy Paper Number 57, Dept. of CA 02241686 1998-06-2~
-multiplied by second power of the mean tide range, and even if the size of a basin is made larger, the mean tide range at the barrage site is sma11er, as a result of which the output energy is not so much increased for that size enlargement.
It is a further problem that the mz~srirnum output of turbines is determined by a m~rimum tide range occuring at spring tide, but the output of the turbines at neap tide is reduced to about l/4 the mz~imum output.
Still further problem consists in the troublesome manipulation of sluices. For instance, at ebb tide generation mode, the manipulation is repeated twice a day, wherein the sluices are opened to fill flood tide to the basin every one power generation is fini.~hed and the sluices are closed directly before ebb tide begins.
The sluices are not only laborious to manipulate, but also make the mean tide range small and act to attenuate the output energy because the sluices are closed in haste while the water level of the basin is not fully elevated when the ebb tide begins. Moreover, the construction cost of sluices is more expensive than that of barrages, and consequently, it is desirable that sluices be dispensed with.
In order to avoid the foregoing problems, the invention is designed to provide a multiple tidal pumped storage power generation arrangement free of sluices by dividing a bay r~nging from its mouth to its bottom into two or three watelw~y~, one of which is used for a tideway and the other of which is used for sluice-free basins for power generation. The basins are built each by enclosing a basin with a barrage that extends along the tideway and a barrage that extends CA 02241686 1998-06-2~
squarely to the tideway, and installing a caisson mounted with a pump-turbine to the former barrage so as to face the tideway. One half of the basins is for ebb tide power generation mode and the other half of the basins is for flood tide power generation mode.
Accordingly, this inv~ ion is designed to provide a multiple tidal pumped storage power generation arrangement keeping a natural tidal range by constructing a power generation arrangement for a single basin and ebb tide generation mode and then, a power generation arrangement for a single basin and flood tide generation mode while operating the previous power generation arrangement, or vice versa, thus constructing power generation arrangements one after another in sequence to ultimately complete the multiple tidal pumped storage power arrangement composed of a plurality of power generation arrangements and ~ttslinin~ a mzl~imum tidal energy.
According to one aspect, the present I nv~lltion resides in a method of constructing a multiple tidal pumPed storage power generation arrangement, which comprises dividing a bay site capable of tidal power generation into at least two watel way~ one of which is a tideway extending from a mouth to a bottom of the bay and the other of which is a space for at least one series of basins for power generation keeping a natural tidal range; surrolm-1ing each of the basins with both barrages at the tideway side and at mutually adjacent sides and inst~lling a caisson internally mounted with a pump-turbine at the tideway side, the basins being grouped into at least one basins operating at a single basin and ebb tide generation mode and at least one basins operating at a single basin and flood .. , ~
tide generation mode.
According to another aspect of this inv~ ioni a tidal pumped storage power generation arrangement is providedj which cL~ JLises at least one basins for a single basin and ebb tide generation mode and at least one basins for a single basin and flood tide generation mode, installed adjacent to one another so as to face a tideway of a tidal bay site, wherein the basins are operated at nighttime in such a manner that the water level of the former basins is elevated up to a specified level which is higher than a m~rimum level at-spring tide by nighttime electric power of grid, thus m~rimi~ing a water head of the turbines and the water level of the latter basins is lowered to a specified level which is lower than the datum level by ni~httime electric power of grid, thus m~rimi7in~ a water head of the turbines, whereas at daytime, both the basins perform tidal pumped storage power generation by use of the water heads at an efflciency of 100% or more, whereby a contilluous power generation is enabled at a m~imum output of each turbine for 11 to 12 hours.
In a plerel~ed embodiment, the bay site is divided into two or .
three w~telw~y:~. The one waterway (an example of two watelway~) or central w~telway (an example of three watelw2lys) is used for the tideway to keep a natural tidal range. The rest of wat~l w~y~ is used for a plurality of power generation arramgements each having a relatively smail-scale output (e.g.,on the order of one million kW).
In dividing the bay site into watelways, first, for example, the bottom of a bay is applied to one basin, which iS, in turn, surrounded by barrages and a caisson mounted with a pump-turbine to construct one tidal power generation arrangement. Then, a next basin ' CA 02241686 1998-06-2~
is constructed likewise into a next tidal power generation arrangement, while rl-nning the first tidal power generation arrangement. Ultim~tely~ the division into the watelways: is completed and a multiple tidal pumped storage power arrangement is thus completed.
That is to say, a pump-turbine is mounted within the caisson and installed to face the tideway, with its electric power line having input and output connected to the land electric grid. When the water level of the tideway becomes higher than the mean sea level, the water level of the basin is elevated to a specified m~rimum level (e.g., a mzl,rimum level at spring tide), irrespective of spring tide and neap tide by pumping operation by the use of nighttime electric power without using sluices. At daytime conventional operation for ebb tide power generation is possible at a m~lrimum output even at neap tide.
This is called a single basin and ebb tide pumped storage power generation arrangement.
Next, a single basin and flood tide pumped storage power generation arrangement will be constructed. A pump-turbine is installed at a deeper place than the ebb tide power generation ~
arrangement since the the water level of the basin is used at a lower level than the mean sea level. The ebb tide power generation arrangement and the flood tide power generation arrangement are not necessarily installed adjacent to each other, but the position relation of the both may be chosen optionally.
The flood tide pumped storage power generation arrangement is operated so that when the level of the tideway becomes lower than the mean sea level, the basin level is lowered to a specified limit which is lower than'the datum level by r1mnine the~pump by nighttime electric power of the grid. The lowering degree depends on the depth at which the pump-turbine is disposed, and consequently, the pump-turbine is disposed at a deepest possible place (30 meter or less beneath the mean sea level).
By combining the basin of the ebb tide pumped storage power generation arrangement called "higher pond" and the basin of the flood tide pumped storage power generation arr~ngement caliad "lower pond", it is possible to generate, at daytime, electric power keeping each m~ mum output continually for ll to 12 hours. Here, the water levels of the higher pond and the lower pond are made sufficiently higher and lower, respectively, than the natural tidal level by nighttime pumping operation, so that the heads due to the turbines a~e larger than natural heads, which results in an increase of artificial mean tidal range and accordingly, a~l~inil~g a generating efficiency of l007~ or more. The combin~tion of daytime tidal energy portion (kWh) in addition to the pumped storage ener8y portion enables to obtain an annual output (kWh) of'about two times the purchased niEhttime energy (kWh). One reason why the generating efflciency is impluved is that the pumps are operated at a .~m~11er head (for example, when lowering the water~level of the lower pond at nighttime, the water is evacuated from the pond to the sea with the pump at a lower level than the mean sea level by talcing advantage of the peLÇu~ ance that the ~m~11er is the head of the pump, the larger the flow rate under the same shaft power condition).
In the ebb tide power ~generation arrangementi when the water . ~ . ' CA 02241686 1998-06-2~
level of the tideway becomes higher than that of the higher pond at nighttime when the pumps are not used, the rotary shafts of the turbines are released to free rotation, instead of using sluices, to assist sea water in refilling into the higher pond thereby to enable to reduce the perchased nighttime power.
The preferred embodiments of this invention will be hereinafter described in more detail with reference to the accompanying dl~willgs, in which:
Fig. 1 is a dia~ tic plan view of a multiple tidal pumped storage power plant constructed at a tidal bay site;
Fig. 2 is a transverse sectional view of the plant of Fig. 1 taken along 1~ line of Fig. 1 showing the relation between the depth of the bay and the inst~ tion depth of the pump-turbines, and the upper and lower limits of the water levels of respective basins at ebb tide pumped storage power generation mode and at flood tide pumped storage power generation mode, respectively;
Fig. 3 is a transverse sectional view taken along m-m line of Fig. 1 showing the slope of the mean tidal range from the mouth to the bottom of the bay.
Referring to Fig. 1, a bay A as a tidal power site faces the ocean B and extends from a mouth Al-AZ of the bay to a bottom A3 of the bay. The mean tidal range (the dirrerence between ebb tide and flood tide through spring to neap) is gradually increased from the mouth toward the bottom of the bay A in a slope of 34 to 35 as shown in Fig. 3 relative to a datum horizontal line 33. The bay A is divided into a tideway 1 extending at the bay shore side of Al to A3 CA 02241686 1998-06-2~
and a waterway 2 extending at the bay shore side of A2 to A3, where a series of basins 4 to 9 for power generation are adapted to be built in sequence thereby to l11tim~tely form a multiple tidal pumped storage power generation arrangement 3.
Here, the basins 4, 8, 9 are used for ebb tide power generation mode and the basins 5, 6, 7 are used for ~ood tide power generation mode.
Each basin is enclosed by barrages 11 and the bay shore of A2-A3, and the barrage 11 facing the tideway 1 has a caisson 12 mounted with a pump-turbine 13.
In one ~x~mple of a bay A as shown in Fig. 2, its sea bottom (dotted line) is shallow near the mouth of the bay and is deeper at the middle place of the bay as shown at A4. A deep bay place that has a depth of 30 meter or more from the mean sea level is not suited for tidal power generation and is advantageously used for a tideway.
This is because the construction cost of barrages is proportional to the second power of the depth. Taking the fact that a deep place of the bay is not always its center place into accounti it is better to make a n~luwest possible tideway 1 by linking deeper places of the bay, which enables to allocate a greater area to the basins.
At flood tide power generation mode, it is desirable that the pump-turbines 13 of the basins 5,6,7 be installed at a deeper position 25 of within 30 meter below the mean sea level as shown in Fig. 2, and thus it is possible to construct flood tide power generation arrangements in series, insofar as a balance in the power output (kW) between ebb tide and flood tide power generation modes is eventually kept.
CA 02241686 1998-06-2~
The operation of the tidal pumped storage power generation arrangement of the invention will be e~l~ined by way of example of one higher pond (e.g.,4) and one lower pond (e.g.,5):
In the ebb tide power generation arrangement, the water level of the basin 4 is, at nighttime, elevated to a m~imum specffled level 22 (for example, Z meter above the mean sea level 21) by pumping operation irrespective of spring tide and neap tide, whereas at daytime power is generated to produce a turbine power (kW) such that the water level of the basin 4 may be changed from 22 to 21.
In the flood tide power generation arrangement, the water level of the basin 5 is lowered to a minimum specified water level 23 (e.g.,2 X Z meter below the mean sea level 21) by pumping operation at nighttime irrespective of spring tide and neap tide, whereas at daytime, power is generated to produce such a turbine power (kW) that the water level of the basin 5 may be changed from 23 to 21. Here, the reference numeral 24 design~tes a datum depth, which is a depth (Z meter) from the mean sea level 21 at a minimum water level at spring tide.
As described above, the invention has advantages what follow:
1. Even when a plurality of tidal pumped storage power generation arrangements are constructed in series, the provision of the tideway extending from a mouth to bottom of a bay enables to keep a natural tidal range. Consequently, it is possible to construct many relatively small-sized tidal pumped storage power plants, with the result that a m~rimum energy of the tidal power site can be extracted.
CA 02241686 1998-06-2~
2. The basins 4 to 9 form each an independent tidal pumped storage power plant constituting a pond (called here a higher pond or lower pond) for pumped storage power generation coupled with the ocean (tideway 1). VVhile rl-nning one tidal power plant after its construction, it ispossible to undertake the construction of the next power plant, thus constructing power plants one after another, and consequently, it becomes possible to make a long-term construction plan. This enables to secure ample annual budgets.
3. By taking advantage of cheap nighttime electric power of the grid, the water level of the higher ponds is elevated up to a specified m~imum limit for the ebb tide generation mode and the water level of the lower ponds is lowered to a specified minimum limit for the flood tide generatian mode irrespective of spring tide and neap tide. As a consequence, it is possible to generate power every day at daytime for 11 to 12 hours at each m~imum power output by availing themselves of a time difference of 6.2 hours between the ebb tide generation phase and the flood tide generation phase (one tide cycle is 12.4 hours) .
4. Since the natural tidal range is amplified by operating the pumps at nighttime, the efficiency of the pumped storage power generation output portion is more than 100% even if the mech~niczll efficiency is estimated to be 70%, seeing that the output energy (kWh) is proportional to the second power the mean tidal range. In 1ition to this, a daytime output energy portion by tidal power generation is obtained. An overall output energy obtained from one basin is thus about 2 times that of the existing single basin type tidal power plant, which contributes to the reduction in the construction cost per kWh.
5. No sluices are used except for locks for ships, which reduces the construction cost. Even where any sluice is necessitated, the pump-turbines will do merely by releasing their rotary shafts to a free rotation state, since their conduit tubes serve as a Venturi tube type sluice.
Claims (6)
1. A method of constructing a multiple tidal pumped storage power generation arrangement harnessing tidal power and pumped storage power at a bay site capable of tidal power generation while keeping a natural tidal range, which comprises dividing the bay into a tideway extending from a mouth to a bottom thereof and at least one waterway, extending along the tideway at one side and at least one shoreline of the bay at the other side; and building aseries of basins for tidal pumped storage power generation in the waterway, said basins being adjacent to one another and being enclosed each by barrages both at the tideway side and at mutually adjacent sides and installed each at the tideway side with a caisson mounted with a pump-turbine.
2. The method of constructing a multiple tidal pumped storage power generation arrangement as set forth in claim 1, wherein the basins are divided into two types of basins for mutually reverse tidal power generation modes, the one being for a single basin and ebb tide power generation mode and the other being for a single basin and flood tide power generation mode.
3. The method of constructing a multiple tidal pumped storage power generation arrangement as set forth in claim 1 or 2, wherein the tideway is disposed intermediately between two waterways, one of which extends along one shoreline of the bay and the other of which extends along the other shoreline of the bay.
4. The method of constructing a multiple tidal pumped storage power generation arrangement as set forth in claims 1, 2 or 3, wherein after either of the first and second basins is first built in the waterway, the other basin is subsequently built while operating the previous basin, thus building basins one after another, whereby the multiple tidal pumped storage power generation arrangement can be operated earlier even by only one basin and ultimately, is completed to be operated at a maximum power.
5. A multiple tidal pumped storage power generation arrangement comprising first basins and second basins each forming a single basin type of power plant; said first basins each having a pump-turbine and operating at ebb tide generation mode, said second basins each having a pump-turbine and operating at flood tide generation mode, said first basins and said second basins being installed at a tidal bay site capable of tidal power generation at a waterway along a tideway extending from a mouth to a bottom of the bay so as to be adjacent to each other, wherein the pump-turbines of the first and second basins are operated, at nighttime, by nighttime electric power of grid to elevate the water level of the first basins up to an upper limit at spring tide and to lower the water level of the second basins to a lower limit, thus increasing the water heads of the turbines; and to generate, at daytime, tidal power at a maximum output of the turbines by harnessing the increased water heads, whereby power generation is enabled at an efficiency of 100% or more continuously for 11 to 12 hours.
6. The multiple tidal pumped storage power arrangement as set forth in claim 5, wherein the annual sum of an output energy from the pumped storage generation and an output energy of the tidal power generation is about twice the nighttime imported energy from the electric grid.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP9-200818 | 1997-07-10 | ||
| JP9200818A JPH1129921A (en) | 1997-07-10 | 1997-07-10 | Method and device for building multiple tidal pumped storage power generating system, for developing maximum energy at tidal power generating site |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2241686A1 true CA2241686A1 (en) | 1999-01-10 |
Family
ID=16430720
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002241686A Abandoned CA2241686A1 (en) | 1997-07-10 | 1998-06-25 | Multiple tidal pumped storage power generation arrangement and method of constructing the same at tidal power site |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JPH1129921A (en) |
| CA (1) | CA2241686A1 (en) |
| FR (1) | FR2765920B1 (en) |
| GB (1) | GB2327241B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2376506B (en) * | 2001-03-15 | 2004-08-04 | Augustine Pascal Joseph Murphy | Tidal power generation |
| AUPS175802A0 (en) | 2002-04-15 | 2002-05-23 | Hastings, Stephen John | A system for generating power |
| US7479708B1 (en) * | 2007-08-27 | 2009-01-20 | Donald Alan Sternitzke | Wave power converter apparatus employing independently staged capture of surge energy |
| CN103362728A (en) * | 2013-07-17 | 2013-10-23 | 宁夏新航能源环境科技有限公司 | Power generating device and method by utilizing tide fluctuation |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB487850A (en) * | 1935-09-26 | 1938-06-24 | Albert Caquot | Method and system for utilising tidal energy |
| FR833915A (en) * | 1937-07-06 | 1938-11-04 | Advanced use of tidal energy | |
| DE802568C (en) * | 1949-03-17 | 1951-02-15 | Peter Hirsch | Tidal power plant with constant energy extraction |
| FR1385984A (en) * | 1964-03-13 | 1965-01-15 | Licentia Gmbh | Continuous operation tidal power plant |
| GB2145165A (en) * | 1983-08-18 | 1985-03-20 | Hitoshi Kinno | Pumped storage system at tidal power site |
| GB2207710B (en) * | 1987-08-05 | 1992-04-15 | Colin Horne | Method for harnessing tidal energy. |
-
1997
- 1997-07-10 JP JP9200818A patent/JPH1129921A/en active Pending
- 1997-11-13 GB GB9723875A patent/GB2327241B/en not_active Expired - Fee Related
- 1997-11-20 FR FR9714579A patent/FR2765920B1/en not_active Expired - Fee Related
-
1998
- 1998-06-25 CA CA002241686A patent/CA2241686A1/en not_active Abandoned
Also Published As
| Publication number | Publication date |
|---|---|
| GB2327241A (en) | 1999-01-20 |
| GB2327241B (en) | 1999-07-21 |
| FR2765920A1 (en) | 1999-01-15 |
| FR2765920B1 (en) | 2000-01-14 |
| JPH1129921A (en) | 1999-02-02 |
| GB9723875D0 (en) | 1998-01-07 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| FZDE | Discontinued |