Power generation system and power generation method

Abstract

To provide a system for achieving pumped-storage power generation using seawater at a low cost, and a power generation method using the system.SOLUTION: A power generation system comprises at least one tank, a water supply and drainage pipe, and a power generation unit. The tank is configured to store seawater, groundwater, or river water. The water supply and drainage pipe has a first end connected to the tank and a second end in contact with the seawater, groundwater, or river water. The power generation unit is connected to the water supply and drainage pipe and is configured to generate electric power using the seawater, groundwater, or river water stored in the tank. The power generating unit has a water turbine located below the water level of the sea or river, and a power generator connected to the water turbine and located above the water level of the sea or river.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] One embodiment of the present invention relates to a power generation system and a power generation method using the power generation system. For example, one embodiment of the present invention relates to a pumped storage power generation system that uses seawater, river water, groundwater, or the like, and a power generation method using the same. [Background technology]

[0002] Pumped-storage power generation is known, which utilizes surplus electricity (surplus power) at night, etc. For example, Patent Documents 1 and 2 disclose systems that use surplus electricity to store seawater in a reservoir or water tank, and generate power by utilizing the potential energy of the stored seawater. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 56-129540 [Patent Document 2] JP 2022-115034 A Summary of the Invention [Problem to be solved by the invention]

[0004] An object of one embodiment of the present invention is to provide a new system for pumped storage power generation and a new power generation method using this system. Alternatively, an object of one embodiment of the present invention is to provide a system for realizing pumped storage power generation using seawater, river water, groundwater, etc. at low cost and a power generation method using this system. [Means for solving the problem]

[0005] One embodiment of the present invention is a power generation system. The power generation system includes at least one tank, a water supply and drainage pipe, and a power generation unit. The tank is configured to store seawater, groundwater, or river water. The water supply and drainage pipe has a first end connected to the tank and a second end in contact with the seawater, groundwater, or river water. The power generation unit is connected to the water supply and drainage pipe and configured to generate power using the seawater, groundwater, or river water stored in the tank. The power generation unit includes a water turbine located below the sea surface or the river water surface, and a generator connected to the water turbine and located above the sea surface.

[0006] One embodiment of the present invention is a method for generating electricity, which includes supplying seawater, groundwater, or river water to a tank using a water turbine and a water supply and discharge pipe having a first end connected to a tank and a second end connected to sea, groundwater, or river water, and generating electricity using the seawater, groundwater, or river water supplied to the tank with a power generation unit having a water turbine and a generator connected to the water turbine. The water turbine and the generator are located at positions lower and higher than the sea level or the river water, respectively. [Brief description of the drawings]

[0007] [Figure 1] 1 is a conceptual diagram of a power generation system according to an embodiment of the present invention. [Figure 2A] FIG. 2 is a schematic top view showing the arrangement of tanks and power generation units in the power generation system according to the embodiment of the present invention. [Figure 2B] FIG. 2 is a schematic top view showing the arrangement of tanks and power generation units in the power generation system according to the embodiment of the present invention. [Diagram 3] FIG. 2 is a schematic top view showing the arrangement of tanks and power generation units in the power generation system according to the embodiment of the present invention. [Figure 4] FIG. 2 is a schematic perspective view of a tank of the power generation system according to the embodiment of the present invention. [Diagram 5] FIG. 2 is a schematic end view of a tank of a power generation system according to an embodiment of the present invention. [Figure 6]FIG. 2 is a schematic end view of a tank of a power generation system according to an embodiment of the present invention. [Figure 7] 1 is a schematic side view of a power generation system according to an embodiment of the present invention. [Figure 8A] FIG. 2 is a schematic top view of a tank of the power generation system according to the embodiment of the present invention. [Figure 8B] FIG. 2 is a schematic perspective view of a portion of a tank of the power generation system according to the embodiment of the present invention. [Figure 9] FIG. 2 is a schematic side view of a portion of a tank of the power generation system according to the embodiment of the present invention. [Figure 10A] FIG. 2 is a schematic end view of a tank of a power generation system according to an embodiment of the present invention. [Figure 10B] FIG. 2 is a schematic end view of a tank of a power generation system according to an embodiment of the present invention. [Figure 11A] FIG. 2 is a schematic perspective view of a tank of the power generation system according to the embodiment of the present invention. [Figure 11B] FIG. 2 is a schematic perspective view of a tank of the power generation system according to the embodiment of the present invention. [Figure 12] FIG. 2 is a schematic end view of a tank of a power generation system according to an embodiment of the present invention. [Figure 13] 1 is a schematic perspective view of a power generation system according to an embodiment of the present invention. [Figure 14A] 1 is a schematic side view of a power generation system according to an embodiment of the present invention. [Figure 14B] 1 is a schematic side view of a power generation system according to an embodiment of the present invention. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0008] Hereinafter, each embodiment of the present invention will be described with reference to the drawings, etc. However, the present invention can be embodied in various forms without departing from the spirit of the present invention, and the present invention should not be interpreted as being limited to the description of the embodiments exemplified below.

[0009] In order to clarify the description, the drawings may show the width, thickness, shape, etc. of each part in a schematic manner compared to the actual embodiment, but these are merely examples and do not limit the interpretation of the present invention. In this specification and each drawing, elements having the same functions as those described in the previous drawings may be given the same reference numerals, and duplicated descriptions may be omitted.

[0010] Hereinafter, a power generation system according to an embodiment of the present invention and a power generation method using the power generation system will be described.

[0011] 1. Power generation system A schematic diagram of this power generation system 100 is shown in Fig. 1. The power generation system 100 is a system that can realize low-cost pumped storage power generation using seawater, river water, or groundwater (hereinafter collectively referred to as power generation water), and basically comprises a tank 110 for storing the power generation water, a water supply and drainage pipe 102 for supplying the power generation water to the tank 110, and a water wheel 144 and a generator 142 that constitute a power generation unit 140.

[0012] The tank 110 is placed on the land side of a coastline or a river. The tank 110 is placed so that the liquid level of the power-generating water stored therein is higher than the water turbine 144. There is no restriction on the number of tanks 110, and there may be one or more. The structure of the tank 110 will be described in detail later.

[0013] The water supply and drainage pipe 102 connects the tank 110 to the sea, a river, or an underground water vein to supply the water for generating electricity to the tank 110, and also functions as a flowing water path for discharging the water for generating electricity stored in the tank 110 to the sea or a river during power generation. Therefore, one end 102a is connected to the tank 110, and the other end 102b is connected to the sea, a river, or an underground water vein. In order to supply the water for generating electricity at any time, the end 102b is located at a position lower than the water level of the sea or the river at low tide. In contrast, the end 102a is located at a position higher than the end 102b and is connected to the lower part of the tank 110. This provides potential energy for generating electricity to the water for generating electricity stored in the tank 110. By discharging the water for generating electricity to the sea or a river, this potential energy is released and converted into electrical energy by the power generation unit 140. The water supply and drainage pipe 102 is provided with an opening and closing valve 104, and the flow of the water for generating electricity in the water supply and drainage pipe 102 is controlled by controlling the opening and closing valve 104.

[0014] A power transmission line (not shown) is connected to the generator 142 of the power generation unit 140 for supplying the generated power to an external load (not shown) and for receiving the power required for pumping the power-generating water from an external power source. The generator 142 is preferably installed at a position higher than the water level of the sea or river, for example, on land. This arrangement makes it easy to maintain the generator 142. On the other hand, the water wheel 144 is installed at a position lower than the water level of the sea or river and is connected to a water supply and discharge pipe. Therefore, the water wheel 144 is located lower than the liquid level of the power-generating water stored in the tank 110, and is rotated by the power-generating water when the power-generating water in the tank 110 is discharged into the sea or river, which drives the generator 142 and generates electrical energy. Conversely, when the water for generating electricity is pumped up to the tank 110, the turbine 144 is rotated in the reverse direction by the power supplied to the generator 142, and the water for generating electricity is stored in the tank 110 from the sea, a river, or an underground water vein through the water supply and drainage pipe 102. The power at this time may be so-called surplus power, or renewable energy power obtained from solar power generation, wind power generation, etc. Using the surplus power, the water for generating electricity can be pumped up at low cost, and the oversupply of electricity from base load power sources such as nuclear power plants and thermal power plants can be prevented. Conversely, by generating electricity at times when the demand for electricity increases, the tightness of the demand for electricity can be alleviated. In addition, since the power generation can be started simply by operating the opening and closing valve 104, the power generation system 100 can also be used as an emergency power source or a black start power source. Although not shown, when pumping up the water for generating electricity, a separately installed pump may be used instead of the power generation unit 140.

[0015] When the power generation system 100 includes a plurality of tanks 110, a power generation unit 140 can be connected to each tank 110 as shown in the schematic top view of FIG. 2A. Alternatively, a plurality of tanks 110 may be connected to one power generation unit 140 as shown in FIG. 2B. In this case, the water supply and drainage pipe 102 may be branched between the power generation unit 140 and one tank 110. Alternatively, as shown in FIG. 3, a plurality of tanks 110 may be connected to one power generation unit 140, and one or more water turbines 144 (or pumps) may be further connected to one or more tanks 110. In this case, the power generation water can be pumped up using a plurality of water turbines 144 (or pumps) as shown by the dotted arrows, so that the power generation water can be supplied to the plurality of tanks 110 more quickly. In addition, by appropriately using the opening and closing valves 104, the power generation water can be supplied from a plurality of tanks 110 to one power generation unit 140 (see the solid arrows), so that the number of generators 142 can be reduced, and as a result, the power generation system 100 can be constructed at a lower cost.

[0016] 2. Tank structure 4 and 5 are schematic perspective and end views, respectively, of the tank 110. As shown in these figures, the tank 110 has a main body 112 that functions as a container for storing water for power generation, and a floating roof 114 disposed on the main body 112.

[0017] The main body 112 may have, for example, a cylindrical shape, and is preferably arranged so that the inner bottom surface 112b of the main body 112 is located above the sea level or the river and / or the water wheel 144. The size of the main body 112 may be determined arbitrarily. For example, the diameter may be selected from the range of 50 m to 120 m, or 80 m to 100 m. The height may also be determined arbitrarily, and may be selected from the range of 15 m to 30 m, or 20 m to 25 m. The water supply and drainage pipe 102 is connected to a connection port (manhole) 112c provided at the bottom of the main body 112 (at a position close to the inner bottom surface 112b). Preferably, the inside (bottom surface, side wall) of the main body 112 is appropriately coated to suppress corrosion by seawater. For example, it is preferable to coat the inside of the main body 112 with fluorine-containing resin such as polytetrafluoroethylene, fiber-reinforced plastic in which epoxy resin or phenolic resin is combined with fibers such as glass fiber or carbon fiber, glass, or ceramic-containing resin. Alternatively, a waterproof sheet that is resistant to seawater (seawater-resistant waterproof sheet) containing fluorine-containing resin, polyimide, polyamide, polyvinyl chloride, fiber-reinforced plastic, or the like may be placed inside main body 112.

[0018] The floating roof 114 is not fixed to the main body 112, but is provided so as to float on the stored power-generating water. Therefore, it moves up and down according to the amount of power-generating water stored (see the solid arrow in FIG. 5). To prevent the power-generating water from leaking or evaporating from the gap between the floating roof 114 and the main body 112, a seal 116 is provided on the outer periphery of the floating roof 114. The floating roof can also function as a weight that applies pressure to the stored power-generating water, so that it can increase the flow rate of the power-generating water supplied to the water turbine 144 during power generation, contributing to increased power generation efficiency. It is preferable that the floating roof 114, especially the inside (underside) of the floating roof 114 that comes into contact with the power-generating water, be coated with the above-mentioned coating or have a waterproof sheet installed.

[0019] The tank 110 may further be provided with a rotating ladder 118, and may also be provided with a spiral staircase, a wind girder for preventing deformation of the main body 112 due to wind pressure, a snow melting pipe for supplying steam to melt snow on the floating roof 114, and the like, all of which are not shown. Furthermore, a drain valve 120 for introducing rainwater stored on the floating roof 114 into the main body 112, and a drain pipe 122 for passing the rainwater through the main body 112 and discharging it to the outside of the tank 110, and the like may also be provided. The drain valve 120 is closed in a steady state, and is opened when introducing rainwater into the main body 112. By introducing rainwater into the main body 112 using the drain valve 120, it is also possible to supply water for generating electrical energy to the main body 112 without using an external power source. In addition, when the tank 110 is filled with the maximum allowable amount of water for power generation, the rainwater stored on the floating roof 114 can be discharged to the outside of the tank 110 using the drain pipe 122.

[0020] Furthermore, the power generation system 100 may include a plurality of solar panels 150 arranged on the floating roof 114 (see FIG. 4). The solar panels 150 may also be provided on the side of the main body 112. Furthermore, as shown in FIG. 6, the solar panels 150 may be provided so as to cover the upper surface and side of the tank 110, i.e., the entire surface of the floating roof 114 and the entire side of the main body 112. As shown in FIG. 7, by providing solar panels 150 on the side of the main body 112 of a plurality of tanks 110, sunlight reflected by the side of the tank 110 can be supplied to the solar panels 150 of the adjacent tanks 110. Therefore, power can be generated even by the solar panels 150 on the side surfaces that are not directly irradiated with sunlight, so that power can be generated more efficiently.

[0021] In order to generate solar power more efficiently, the tank 110 may be configured so that the floating roof 114 can rotate (spin) around its central axis, as shown by the arrow in FIG. 6. This allows the irradiation angle of sunlight to be optimized for the solar panel 150 installed on the floating roof 114. For example, as shown in FIG. 8A and FIG. 8B, one or more drive rollers 154 for rotating the floating roof 114 may be provided inside the main body 112. By rotating the drive roller 154 as shown by the solid arrow while keeping its position fixed, frictional force between the drive roller 154 and the floating roof 114 occurs, causing the floating roof 114 to rotate (see the dashed arrow). Alternatively, in order to rotate the floating roof 114 more efficiently, the surface of the drive roller 154 may be processed into a gear shape, and multiple ribs 114a that mesh with the surface of the drive roller 154 may be provided on the upper surface of the floating roof 114. As described above, since the floating roof 114 moves up and down depending on the amount of power-generating water in the tank 110, a movement mechanism 156 for moving the drive roller 154 up and down is provided on the main body 112. Although not shown, instead of the drive roller 154, a screw may be provided on the underside of the floating roof 114, and the floating roof 114 may be rotated using the screw.

[0022] Furthermore, solar panels 150 may be installed on the ground of the site where the tank 110 is constructed. The solar panels 150 may be flexible solar panels. By using flexible solar panels 150, the solar panels 150 can be installed at a high density so as to fit the shape of the side surface of the main body 112. By providing the solar panels 150, the generated electricity can be used to pump water for power generation during the day, and when the tank 110 is sufficiently filled with water for power generation, electricity can be supplied to an external load.

[0023] The power generation system 100 may further include a power storage device 152 that stores the power generated by the solar panel 150. The power storage device 152 may be installed on the floating roof 114 or outside the tank 110. One power storage device 152 may be connected to the solar panels 150 provided on the multiple tanks 110. The power storage device 152 is connected to the water wheel 144 and configured to drive the water wheel 144 to supply water for power generation to the main body 112. By adopting such a configuration, the power generated by the solar panel 150 during the day can be stored in the power storage device 152 and the power can be used to pump up water for power generation at night, so that the power storage device 152 can be used as an auxiliary power source for pumping.

[0024] Such a tank 110 can be provided by repurposing a tank for storing or stockpiling fossil fuels such as crude oil (hereinafter, these will be collectively referred to as a crude oil storage tank). A crude oil storage tank is usually constructed at a position several meters to more than a dozen meters higher than the sea level or the water level of a river, so that sufficient potential energy for power generation can be secured. In this case, the crude oil storage tank is used as the tank 110 after the remaining crude oil is drained and the inside is cleaned. At this time, the above-mentioned coating may be applied to prevent corrosion by seawater.

[0025] In recent years, there has been a dramatic advance in energy-saving technologies, as typified by electric vehicles and hybrid vehicles, and fuels used in thermal power generation are shifting from crude oil to natural gas. Furthermore, there is also a trend toward decarbonization aimed at carbon neutrality, and the consumption of crude oil is decreasing. As a result, unnecessary crude oil storage tanks are being found in various places. Since such crude oil storage tanks are usually installed in coastal areas such as port areas and industrial zones, by repurposing the crude oil storage tanks and providing them as tanks 110, the cost of constructing new tanks 110 can be reduced without demolishing the crude oil storage tanks. In addition, since the power transmission network is developed in coastal areas, the power generation system 100 can be constructed at low cost by repurposing the crude oil storage tanks. Furthermore, since the crude oil storage tanks have an extremely large volume, large-scale power generation is possible by using the present power generation system 100, which can be repurposed from crude oil storage tanks.

[0026] Conventionally, pumped storage power generation has been carried out mainly by dams and reservoirs constructed in mountainous areas. However, such pumped storage power generation not only requires huge costs and time to construct the dams and reservoirs, but also causes environmental destruction. In addition, suitable locations for large dams and reservoirs are limited. Furthermore, the amount of power generation is greatly affected by the climate, i.e., the amount of rainfall. However, by using the power generation system 100, not only can the existing facilities be used as "dams," but also the construction of reservoirs is unnecessary, since the power generation water can be released into the sea or rivers during power generation. Therefore, not only is the cost and time required for acquiring new land unnecessary, but a new power plant can be built without putting a burden on the environment. Furthermore, since seawater is virtually inexhaustible, a stable power supply is possible regardless of the weather.

[0027] 3. Tank variants (1) Variation 1 The structure of the tank 110 is not limited to the above-mentioned structure. For example, as shown in FIG. 10A, the tank 110 may have an auxiliary tank 124 capable of storing power generation water on the floating roof 114. The auxiliary tank 124 is connected to an auxiliary water supply pipe 128, and a valve 126 is provided on the auxiliary water supply pipe 128. The auxiliary water supply pipe 128 connects the inside of the auxiliary tank 124 and the main body 112 via the floating roof 114, and functions as a path for transporting power generation water between the main body 112 and the auxiliary tank 124. When the valve 126 is opened with the main body 112 filled with power generation water, the weight of the floating roof 114 and the auxiliary tank 124 is applied to the power generation water, and as a result, the power generation water in the main body 112 is transported to the auxiliary tank 124 by the auxiliary water supply pipe 128 (see the solid arrow in FIG. 10B). After that, by closing the valve 126, the movement of the power generation water stops, and the floating roof 114 maintains a floating state on the power generation water. When the on-off valve 104 is opened in this state, the power-generating water is supplied from the water supply / drainage pipe 102 to the power generation unit 140 (see the dotted arrow in FIG. 10B), and at this time, the weight of the floating roof 114, the auxiliary tank 124, and the power-generating water in the auxiliary tank 124 is added to the power-generating water in the main body 112. In other words, the floating roof 114, the auxiliary tank 124, and the power-generating water in the auxiliary tank 124 can apply pressure in the vertical direction to the power-generating water in the main body 112 (see the white arrow in FIG. 10B). As a result, the flow rate of the power-generating water supplied to the power generation unit 140 increases, and the power generation efficiency of the power generation unit 140 can be increased.

[0028] (2) Variation 2 As described above, in the power generation system 100, an existing crude oil storage tank can be repurposed, but the repurposed tank is not limited to a crude oil storage tank, and various tanks capable of sealing liquids such as water, liquefied gas, and chemicals may be repurposed. For example, as shown in FIG. 11A, a tank for storing river water or groundwater that can be used as industrial water, cooling water, radioactively contaminated water, or treated water thereof may be repurposed as the tank 110. Alternatively, as shown in FIG. 11B, a spherical tank for storing liquefied gas may be repurposed as the tank 110. When repurposed, it is appropriately cleaned and decontaminated, and the inside is coated as necessary.

[0029] Unlike a crude oil storage tank, such a tank 110 does not have a floating roof, and is configured so that the main body 112 can be sealed as shown in FIG. 12. Therefore, the internal volume of the tank 110 is constant. Therefore, when storing the power-generating water, a pressure regulating valve 130 is provided to remove the air inside. This pressure regulating valve 130 may be opened or closed when storing the power-generating water. In the former case, even if the liquid level of the power-generating water moves upward as the power-generating water is supplied, the pressure increase in the space 112a above it can be prevented, so the power-generating water can be supplied quickly. On the other hand, if the main body 112 has a certain level of pressure resistance, the pressure regulating valve 130 may be appropriately closed when the power-generating water is supplied. In this case, the space 112a is compressed, creating resistance to the supply of the power-generating water, but the flow rate of the power-generating water can be increased by applying pressure to the power-generating water using the pressure in the space 112a during power generation, so highly efficient power generation is possible.

[0030] 4. Wind power utilization As described above, the power generation system 100 can be constructed by repurposing an existing crude oil storage tank, for example. Existing crude oil storage tanks are usually installed in multiple locations on a large site, so large-scale power generation is possible by using the site to simultaneously generate wind power. In addition, existing crude oil storage tanks are usually constructed in locations away from residential areas and tourist sites, so it is possible to provide a new power plant without causing any adverse effects on the landscape.

[0031] For example, as shown in Fig. 13, a propeller-type wind power generator 160 for generating power by using the wind flowing above the tanks 110 may be provided between adjacent tanks 110. Preferably, the propeller-type wind power generator 160 is provided near the middle of the multiple tanks 110. The number and spacing of the propeller-type wind power generators 160 may be set appropriately depending on the number of tanks 110 and the area of ​​the site on which the tanks 110 are provided. Note that in order to utilize the wind flowing above the tanks 110, the rotation axis of the propeller of the propeller-type wind power generator 160 is installed at a position higher than the height of the tanks 110.

[0032] Alternatively, as shown in FIG. 14A, wind power generators for generating power by utilizing wind (draft) flowing between adjacent tanks 110 may be provided between adjacent tanks 110. In this case, the wind power generator may be a propeller type wind power generator or a Darrieus type wind power generator 162 having a more compact structure. Alternatively, fixing wires 164 may be provided between adjacent tanks 110, and multiple small wind power generators 166 fixed to the wires 164 may be provided. The number of wires 164 and the number of wind power generators fixed to each wire 164 may be appropriately determined taking into consideration the height of the tanks 110, the distance between adjacent tanks 110, the strength of the wires 164, the size and weight of the wind power generators 166, and the like.

[0033] The above-mentioned propeller type wind power generator 160, Darrieus type wind power generator 162, and wind power generator 166 may also be connected to the power storage device 152. This allows the power generated by these wind power generators to be used at the appropriate time.

[0034] The above-mentioned embodiments of the present invention may be combined as appropriate as long as they are not mutually inconsistent. In addition, the scope of the present invention also includes a display device in which the operator appropriately adds or removes components or modifies the design, or adds or omits a process or modifies conditions, based on the display device of each embodiment, as long as the gist of the present invention is maintained.

[0035] Even if there are other effects and advantages different from those brought about by the aspects of each of the above-mentioned embodiments, those which are clear from the description in this specification or which can be easily predicted by a person skilled in the art are naturally understood to be brought about by the present invention. [Explanation of symbols]

[0036] 100: power generation system, 102: water supply and drainage pipe, 102a: end, 102b: end, 104: opening and closing valve, 110: tank, 112: main body, 112a: space, 112b: inner bottom surface, 112c: connection port, 114: floating roof, 114a: rib, 116: seal, 118: rotating ladder, 120: drain valve, 122: drain pipe, 124: auxiliary tank, 126: valve, 128: auxiliary water supply pipe, 130: pressure regulating valve, 140: power generation unit, 142: generator, 144: water wheel, 150: solar panel, 152: power storage device, 154: drive roller, 156: movement mechanism, 160: propeller type wind power generator, 162: Darrieus type wind power generator, 164: wire, 166: wind power generator

Claims

1. at least one tank configured to store seawater, groundwater, or river water; a water supply and drainage pipe having a first end connected to the tank and a second end in contact with the seawater, groundwater, or river water; a power generation unit connected to the water supply and drainage pipe and configured to generate power by utilizing the seawater, groundwater, or river water stored in the tank; The power generation unit comprises: Water turbines located below sea or river level; and A pumped storage power generation system having a generator connected to the water turbine and located above the water level of the sea or river.

2. 2. The pumped-storage power generation system according to claim 1, wherein the inside of the tank is covered with a fluorine-containing resin, a fiber-reinforced plastic, glass, a ceramic-containing resin, or a seawater-resistant waterproof sheet.

3. The tank is A main body that functions as a container for storing the seawater, groundwater, or river water; The pumped-storage power generation system according to claim 1 , further comprising a floating roof located on the main body and floating on the seawater, groundwater, or river water stored in the main body.

4. The tank is An auxiliary tank on the floating roof; an auxiliary water supply pipe for connecting the auxiliary tank and the main body via the floating roof and transporting the seawater, groundwater, or river water between the auxiliary tank and the main body; The pumped-storage power generation system according to claim 3 , further comprising a valve for controlling the flow of the seawater, groundwater, or river water in the auxiliary water supply pipe.

5. The pumped-storage power generation system according to claim 1 , wherein the tank is configured to seal air above a liquid surface of the stored seawater, groundwater, or river water.

6. The pumped storage power generation system according to claim 1 , further comprising: a plurality of solar panels; and a power storage device for storing power generated by the plurality of solar panels.

7. The pumped-storage power generation system according to claim 6 , wherein the plurality of solar panels are arranged over the entire top surface and entire side surfaces of the tank.

8. The pumped-storage power generation system according to claim 6 , wherein the power storage device is electrically connected to the water turbine and configured to drive the water turbine to supply the seawater, groundwater, or river water to the tank.

9. The pumped storage power generation system according to claim 3 , wherein the floating roof is configured to rotate on its axis.

10. Supplying sea water, ground water, or river water to the tank using a water wheel and a water supply and drainage pipe having a first end connected to the tank and a second end connected to the sea, ground water, or river; generating electricity by a power generation unit having the water turbine and a generator connected to the water turbine by utilizing the seawater, groundwater, or river water supplied to the tank; A pumped-storage power generation method, in which the water turbine and the generator are respectively placed at a position lower than the sea level or the water level of a river and a position higher than the sea level or the water level of a river.

11. The power generating method according to claim 10, wherein the inside of the tank is covered with a fluorine-containing resin, a fiber-reinforced plastic, glass, a ceramic-containing resin, or a seawater-resistant waterproof sheet.

12. The tank is A main body that functions as a container for storing the seawater, groundwater, or river water; The power generating method according to claim 10 , further comprising a floating roof located on the main body and floating on the seawater, groundwater, or river water stored in the main body.

13. Supplying the seawater, groundwater, or river water supplied to the main body to an auxiliary tank on the floating roof; and The power generation method according to claim 12, further comprising: applying pressure to the seawater, groundwater, or river water in the main body by utilizing a weight of the seawater, groundwater, or river water supplied to the auxiliary tank during power generation.

14. supplying the seawater, groundwater, or river water to the tank to compress air above the seawater, groundwater, or river water in the tank; and The power generation method according to claim 10, further comprising applying pressure to the seawater, groundwater, or river water in the tank using pressure of the compressed air during power generation.

15. The method further includes storing the electricity generated by the plurality of solar panels attached to the tank in a power storage device; The power generating method according to claim 10 , wherein the supply of the seawater, groundwater, or river water to the tank uses the electric power stored in the power storage device.

16. The method of generating electricity as described in claim 15, wherein the plurality of solar panels are disposed over the entire top surface and sides of the tank.

17. 13. The method of generating electricity as claimed in claim 12, wherein the floating roof is configured to rotate on its axis.

18. the at least one tank comprises a plurality of tanks; The pumped-storage power generation system according to claim 1 , further comprising a wind power generator between the plurality of tanks, the wind power being utilized above the tanks.

19. the at least one tank comprises a plurality of tanks; The pumped-storage power generation system according to claim 1 , further comprising a wind power generator between the plurality of tanks, the wind power generator utilizing the draft between the tanks.

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