GB2145165A - Pumped storage system at tidal power site - Google Patents

Pumped storage system at tidal power site Download PDF

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Publication number
GB2145165A
GB2145165A GB08322195A GB8322195A GB2145165A GB 2145165 A GB2145165 A GB 2145165A GB 08322195 A GB08322195 A GB 08322195A GB 8322195 A GB8322195 A GB 8322195A GB 2145165 A GB2145165 A GB 2145165A
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Prior art keywords
basin
turbine
pump
level
sea
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GB08322195A
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GB8322195D0 (en
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Hitoshi Kinno
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Priority to GB08322195A priority Critical patent/GB2145165A/en
Publication of GB8322195D0 publication Critical patent/GB8322195D0/en
Publication of GB2145165A publication Critical patent/GB2145165A/en
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    • 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)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Oceanography (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Other Liquid Machine Or Engine Such As Wave Power Use (AREA)

Abstract

The system has a first main basin enclosed from the sea 10 by a barrage 2 having a sluice which is opened only during flood tide periods and also a main turbine 4 which generates electricity twice a day during ebb tide periods, and a second basin 5 disposed adjacent to the main basin 1 and enclosed by a barrage 6 having a reversible pump-turbine assembly 7, 8, 15, the pump 7 being driven by the main turbine 4 to lower the water level in the second basin 5 at night. The turbine 8 generates electricity during appropriate daylight hours. Also, the turbine 8 can be operated as a pump 15 which feeds sea water into the second basin 5 in order to increase its water level and to protect the barrage 6 from storm damage. An off-shore dyke 17 of the second basin provides reclaimed land usable as a fish farm. <IMAGE>

Description

SPECIFICATION Pumped Storage System at Tidal Power Site The present invention relates in general to the pumped storage system installed at the tidal power scheme which has single basin and single acting mode, and it relates more particularly to a new and improved method and apparatus for keeping uniform output power with high efficiency during day-time.
It is well known in the tidal power scheme having single basin and single action mode that it's output power pulsate twice a day, this is very low quality power for the grid and night-time output energy which cannot be avoided once a day is less value.
Hitherto two basin system has been considered in order to retime the night-time output energy to day-time energy. However, it is used import energy from the grid, that is no good because it gives large random and pulsate disturbances to the grid compared with uniform output energy as fossil and nuclear energy.
Viewed from above aspect the present invention provides the second basin nearby the main basin where a set of pump-turbine is mounted in the second barrage. If one day is divided into two time ranges at night-time (20.00 hrs to 08.00 hrs) and day-time (08.00 hrs to 20.00 hrs), the whole output power at night-time is used for driving power of pump at the second basin at which the water level in the second basin drops down of which potential can be used for turbine head at the second basin in the next daytime.
Day-time generation can be obtained from the two turbine's series operation namely main turbine Ti and the second basin turbine T2.
The remarkable difference of the present invention from the hitherto considered two basin system is no use of import energy from the grid, and the pump is operated at low tide period only while the main turbine T1 is working under it's high head period. On the contrary, the turbine T2 generate at higher tide level than the tide level at T1 is working at day-time, this makes the cause of high efficiency of the pumped storage system.
Some embodiments of the invention will now be described by way of example and with reference to the accompanying drawings, in which: Fig. lisa groundplan of the two basin system according to the present invention; Fig. 2 is a side view of Fig. 1, partly sectioned, that shows water level relations between sea, main basin and the second basin.
Referring to Fig. 1 and Fig. 2, the main basin 1 is closed from sea 10 by a barrage 2 in which sluices 3 and turbine 4 are mounted. And the second basin 5 is closed by a barrage 6 in which pump 7 and turbine 8 are mounted. The pump 7 and turbine 8 are conventional bulb type pumpturbine.
At flood tide, if sea level 13 is higher than main basin level 14, sea water come into basin 1 through sluices 3. At ebb tide and night-time, sluices 3 is closed and if head of turbine 4 become larger than a lower limit value, for instance 4 m, turbine 4 start and it's output power drives the pump 7, then water level 9 of the second basin 5 drops below than mean tide level 11. Turbine 4 works about 5 hrs at spring and 3.5 hrs at neap provided the minimum turbine head is specified. Pump 7 works same time with turbine 4.
At day-time, if sea level 12 is enough low, turbine 4 generate electric power while water level 14 of the main basin 1 drops to the mean tide level 11. When turbine 4 is rest for the reason of sea level 1 3 is too high to operate turbine 4, turbine 8 can be operated during remaining daytime so as to keep uniform output power at which the head of turbine 8 is much higher than the head of pump 7, this makes the overall efficiency of the pumped storage system more than 100% despite of total machine efficiency is 70%.
Referring to Fig. 1, there is shown another embodiment of the invention wherein turbine 8 can be operated as pump 1 5 toward the second basin 5 from sea 10 by using the grid energy.
Then water level in the second basin 5 can be kept to higher level than sea level. This is useful to protect the barrage 6 from emergency as extra high tide or storm.
Also pump 7 and pump 15 could keep the both water level of sea 10 and the second basin 5 to same level by using their pumping ability even while sea level is changing quickly. This ability is useful for closing off or repairing of the barrage 6.
Referring to Fig. 1, there is shown another embodiment of the invention wherein initial coastline 1 6 moves toward new coastline 1 7 because water level in the second basin 5 is kept lower than before level at no barrage. If a dyke is built on the new coastline 1 7 or more off-shore side, the new reclaim land 18 can be used for fish farm where intake and drain of sea water are very easy by using the pump 7 and pump 15, particularly using weekend surplus tidal energy come from the turbine 4.
1. A pumped storage system at a tidal power site that comprises two basins, wherein the first main basin has a single-acting mode of operation by which a main turbine generates electricity twice a day during ebb tide periods and whose sluices are opened during flood tide periods to refill the first main basin, and wherein the second basin is disposed adjacent to the first main basin and has a pump-turbine assembly in its barrage whose pump is driven by power derived from said main turbine during low electricity demand periods to lower the second basin level, and wherein the turbine of said second basin assembly generates electricity during high electricity demand periods which coincide with said flood tide periods using the head of water between the lowered level of the second basin and the flood tide sea level.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (7)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Pumped Storage System at Tidal Power Site The present invention relates in general to the pumped storage system installed at the tidal power scheme which has single basin and single acting mode, and it relates more particularly to a new and improved method and apparatus for keeping uniform output power with high efficiency during day-time. It is well known in the tidal power scheme having single basin and single action mode that it's output power pulsate twice a day, this is very low quality power for the grid and night-time output energy which cannot be avoided once a day is less value. Hitherto two basin system has been considered in order to retime the night-time output energy to day-time energy. However, it is used import energy from the grid, that is no good because it gives large random and pulsate disturbances to the grid compared with uniform output energy as fossil and nuclear energy. Viewed from above aspect the present invention provides the second basin nearby the main basin where a set of pump-turbine is mounted in the second barrage. If one day is divided into two time ranges at night-time (20.00 hrs to 08.00 hrs) and day-time (08.00 hrs to 20.00 hrs), the whole output power at night-time is used for driving power of pump at the second basin at which the water level in the second basin drops down of which potential can be used for turbine head at the second basin in the next daytime. Day-time generation can be obtained from the two turbine's series operation namely main turbine Ti and the second basin turbine T2. The remarkable difference of the present invention from the hitherto considered two basin system is no use of import energy from the grid, and the pump is operated at low tide period only while the main turbine T1 is working under it's high head period. On the contrary, the turbine T2 generate at higher tide level than the tide level at T1 is working at day-time, this makes the cause of high efficiency of the pumped storage system. Some embodiments of the invention will now be described by way of example and with reference to the accompanying drawings, in which: Fig. lisa groundplan of the two basin system according to the present invention; Fig. 2 is a side view of Fig. 1, partly sectioned, that shows water level relations between sea, main basin and the second basin. Referring to Fig. 1 and Fig. 2, the main basin 1 is closed from sea 10 by a barrage 2 in which sluices 3 and turbine 4 are mounted. And the second basin 5 is closed by a barrage 6 in which pump 7 and turbine 8 are mounted. The pump 7 and turbine 8 are conventional bulb type pumpturbine. At flood tide, if sea level 13 is higher than main basin level 14, sea water come into basin 1 through sluices 3. At ebb tide and night-time, sluices 3 is closed and if head of turbine 4 become larger than a lower limit value, for instance 4 m, turbine 4 start and it's output power drives the pump 7, then water level 9 of the second basin 5 drops below than mean tide level 11. Turbine 4 works about 5 hrs at spring and 3.5 hrs at neap provided the minimum turbine head is specified. Pump 7 works same time with turbine 4. At day-time, if sea level 12 is enough low, turbine 4 generate electric power while water level 14 of the main basin 1 drops to the mean tide level 11. When turbine 4 is rest for the reason of sea level 1 3 is too high to operate turbine 4, turbine 8 can be operated during remaining daytime so as to keep uniform output power at which the head of turbine 8 is much higher than the head of pump 7, this makes the overall efficiency of the pumped storage system more than 100% despite of total machine efficiency is 70%. Referring to Fig. 1, there is shown another embodiment of the invention wherein turbine 8 can be operated as pump 1 5 toward the second basin 5 from sea 10 by using the grid energy. Then water level in the second basin 5 can be kept to higher level than sea level. This is useful to protect the barrage 6 from emergency as extra high tide or storm. Also pump 7 and pump 15 could keep the both water level of sea 10 and the second basin 5 to same level by using their pumping ability even while sea level is changing quickly. This ability is useful for closing off or repairing of the barrage 6. Referring to Fig. 1, there is shown another embodiment of the invention wherein initial coastline 1 6 moves toward new coastline 1 7 because water level in the second basin 5 is kept lower than before level at no barrage. If a dyke is built on the new coastline 1 7 or more off-shore side, the new reclaim land 18 can be used for fish farm where intake and drain of sea water are very easy by using the pump 7 and pump 15, particularly using weekend surplus tidal energy come from the turbine 4. CLAIMS
1. A pumped storage system at a tidal power site that comprises two basins, wherein the first main basin has a single-acting mode of operation by which a main turbine generates electricity twice a day during ebb tide periods and whose sluices are opened during flood tide periods to refill the first main basin, and wherein the second basin is disposed adjacent to the first main basin and has a pump-turbine assembly in its barrage whose pump is driven by power derived from said main turbine during low electricity demand periods to lower the second basin level, and wherein the turbine of said second basin assembly generates electricity during high electricity demand periods which coincide with said flood tide periods using the head of water between the lowered level of the second basin and the flood tide sea level.
2. A system as claimed in claim 1, wherein the turbine of the second basin assembly can be operated as a pump by reverse rotation or blade angle change using power derived from an electricity supply grid so that sea water may be fed into the second basin until its water level becomes sufficiently high to protect the second basin barrage from damage by an extra high tide or by a storm.
3. A system as claimed in claim 1 or claim 2, wherein the pump-turbine assembly in the second basin is operable as a two-direction pump so that it may be used to keep the water in the second basin at substantially the same level as that of the sea by pumping from the higher water level side to the lower water level side in order to facilitate work during closure and/or repair of the second basin barrage.
4. A system as claimed in claim 1, 2 or 3, wherein a dyke is built offshore from the initial coast line of the second basin in order to produce reclaimed land.
5. A system as claimed in claim 4, wherein the reclaimed land is used as a marine fish farm whose intake and drainage of sea water is obtained via the second basin.
6. A pumped storage system at a tidal power site substantially as described herein with reference to the accompanying drawings.
7. A method of operating a pumped storage system at a tidal power site according to any preceding claim, wherein the turbine power output and the pump power input can be kept in substantial uniformity during each power cycle by adjusting the blade angle and/or by changing the speed of rotation of the turbine or pump impeller in order to minimise power disturbance to the electricity supply grid to which, in use, the system will be connected.
GB08322195A 1983-08-18 1983-08-18 Pumped storage system at tidal power site Withdrawn GB2145165A (en)

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GB2145165A true GB2145165A (en) 1985-03-20

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Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2207710A (en) * 1987-08-05 1989-02-08 Colin Horne System for harnessing tidal energy
GB2302709B (en) * 1995-06-27 1997-08-13 Stanley Scott Combined power generating and pumping apparatus
FR2765920A1 (en) 1997-07-10 1999-01-15 Earth Science Lab Corp PUMPING ACCUMULATION TIDE POWER PLANT, WITH MULTIPLE MODULES, AND CONSTRUCTION PROCESS OF THE SAME ON A TIDAL SITE
EP1010811A1 (en) * 1997-07-10 2000-06-21 The Earth Science Laboratory Corp. System for protecting coastal land from rise of surface of the sea
GB2376506A (en) * 2001-03-15 2002-12-18 Augustine Pascal Joseph Murphy System for tidal power generation
US6820333B2 (en) * 2002-03-27 2004-11-23 Hitachi, Ltd. Method of converting storage pumps into reversible pump-turbines
WO2013025240A1 (en) * 2011-08-16 2013-02-21 Ramez Atiya Parallel cycle for tidal range power generation
GB2505415A (en) * 2012-08-28 2014-03-05 William Barrie Heptonstall Pumped storage system using tide to maintain water level in lower reservoir
GB2507362A (en) * 2013-03-15 2014-04-30 Renewable Hydrocarbons Ltd Tidal generation and storage system with three tanks
GB2513178A (en) * 2013-04-19 2014-10-22 Alexander Gokhman Gokhman tidal power plant for lagoon
GB2590353A (en) * 2019-11-18 2021-06-30 Frank Murphy Stuart Water-retaining structure

Citations (2)

* Cited by examiner, † Cited by third party
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
GB511809A (en) * 1937-07-06 1939-08-24 Method and system for utilising tidal energy

Patent Citations (2)

* Cited by examiner, † Cited by third party
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
GB511809A (en) * 1937-07-06 1939-08-24 Method and system for utilising tidal energy

Cited By (19)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2207710A (en) * 1987-08-05 1989-02-08 Colin Horne System for harnessing tidal energy
GB2207710B (en) * 1987-08-05 1992-04-15 Colin Horne Method for harnessing tidal energy.
GB2302709B (en) * 1995-06-27 1997-08-13 Stanley Scott Combined power generating and pumping apparatus
FR2765920A1 (en) 1997-07-10 1999-01-15 Earth Science Lab Corp PUMPING ACCUMULATION TIDE POWER PLANT, WITH MULTIPLE MODULES, AND CONSTRUCTION PROCESS OF THE SAME ON A TIDAL SITE
GB2327241A (en) * 1997-07-10 1999-01-20 Earth Science Lab Corp Tidal pumped storage power generation
GB2327241B (en) * 1997-07-10 1999-07-21 Earth Science Lab Corp Multiple tidal pumped storage power generation arrangement and method of constructing the same at tidal power site
EP1010811A1 (en) * 1997-07-10 2000-06-21 The Earth Science Laboratory Corp. System for protecting coastal land from rise of surface of the sea
EP1010811A4 (en) * 1997-07-10 2000-08-16 Earth Science Lab Corp System for protecting coastal land from rise of surface of the sea
GB2376506A (en) * 2001-03-15 2002-12-18 Augustine Pascal Joseph Murphy System for tidal power generation
GB2376506B (en) * 2001-03-15 2004-08-04 Augustine Pascal Joseph Murphy Tidal power generation
US6820333B2 (en) * 2002-03-27 2004-11-23 Hitachi, Ltd. Method of converting storage pumps into reversible pump-turbines
WO2013025240A1 (en) * 2011-08-16 2013-02-21 Ramez Atiya Parallel cycle for tidal range power generation
US20140182280A1 (en) * 2011-08-16 2014-07-03 Ramez Atiya Parallel cycle for tidal range power generation
GB2505415A (en) * 2012-08-28 2014-03-05 William Barrie Heptonstall Pumped storage system using tide to maintain water level in lower reservoir
GB2505415B (en) * 2012-08-28 2016-11-02 Barrie Heptonstall William Hydroelectric power system
GB2507362A (en) * 2013-03-15 2014-04-30 Renewable Hydrocarbons Ltd Tidal generation and storage system with three tanks
GB2507362B (en) * 2013-03-15 2014-10-22 Renewable Hydrocarbons Ltd Tidal power generation and storage
GB2513178A (en) * 2013-04-19 2014-10-22 Alexander Gokhman Gokhman tidal power plant for lagoon
GB2590353A (en) * 2019-11-18 2021-06-30 Frank Murphy Stuart Water-retaining structure

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