JP3243706U - Tank for pumped storage power generation - Google Patents

Abstract

[Problem] To provide a tank for realizing pumped storage power generation using seawater, groundwater, or river water at low cost. [Solution] A tank for pumped storage power generation includes a main body 112 that functions as a container for storing seawater, groundwater, or river water, and a main body 112 located on the main body and above the seawater, groundwater, or river water stored in the main body. A floating roof 114 is provided. The main body is connected to a water supply and drainage pipe 102 that is connected to a power generation unit. The pumped storage power generation tank includes an auxiliary tank 124 on a floating roof, and an auxiliary water supply pipe 128 for connecting the auxiliary tank and the main body via the floating roof and transporting seawater, groundwater, or river water between the auxiliary tank and the main body. , and a valve 126 for controlling the flow of seawater, groundwater, or river water in the auxiliary water supply pipe. [Selection diagram] Figure 10A

Description

One embodiment of the present invention relates to pumped storage power generation. For example, one embodiment of the present invention relates to a tank suitable for pumped storage power generation using seawater, river water, groundwater, or the like.

Pumped-storage power generation is known to utilize surplus electricity (surplus electricity) during the night. For example, Patent Documents 1 and 2 disclose systems for storing seawater in a reservoir or a water storage tank using surplus power and generating power using the potential energy of the stored seawater.

Japanese Unexamined Patent Publication No. 56-129540 Japanese Patent Application Publication No. 2022-115034

One of the embodiments of the present invention aims to provide a tank for performing pumped storage power generation. Alternatively, an object of one embodiment of the present invention is to provide a tank for realizing pumped storage power generation using seawater, river water, groundwater, etc. at low cost.

One embodiment of the present invention is a pumped storage power generation tank. This pumped storage power generation tank consists of a main body that functions as a container for storing seawater, groundwater, or river water, and a floating tank located on the main body that floats on top of the seawater, groundwater, or river water stored in the main body. Equipped with a roof. The main body is connected to a water supply and drainage pipe connected to the power generation unit.

One embodiment of the present invention is a pumped storage power generation tank. This pumped storage power generation tank is configured to have an open or sealed interior, and has a history of being used as a tank for storing fossil fuels, radioactively contaminated water, or industrial water. The tank is connected to a water supply and drainage pipe that is connected to the power generation unit.

1 is a conceptual diagram of a power generation system according to an embodiment of the present invention. FIG. 1 is a schematic top view showing the arrangement of a tank and a power generation unit in a power generation system according to an embodiment of the present invention. FIG. 1 is a schematic top view showing the arrangement of a tank and a power generation unit in a power generation system according to an embodiment of the present invention. FIG. 1 is a schematic top view showing the arrangement of a tank and a power generation unit in a power generation system according to an embodiment of the present invention. FIG. 1 is a schematic perspective view of a tank of a power generation system according to an embodiment of the present invention. FIG. 1 is a schematic end view of a tank of a power generation system according to an embodiment of the present invention. FIG. 1 is a schematic end view of a tank of a power generation system according to an embodiment of the present invention. 1 is a schematic side view of a power generation system according to an embodiment of the present invention. FIG. 1 is a schematic top view of a tank of a power generation system according to an embodiment of the present invention. 1 is a schematic perspective view of a part of a tank of a power generation system according to an embodiment of the present invention. FIG. 1 is a schematic side view of a part of a tank of a power generation system according to an embodiment of the present invention. FIG. 1 is a schematic end view of a tank of a power generation system according to an embodiment of the present invention. FIG. 1 is a schematic end view of a tank of a power generation system according to an embodiment of the present invention. FIG. 1 is a schematic perspective view of a tank of a power generation system according to an embodiment of the present invention. FIG. 1 is a schematic perspective view of a tank of a power generation system according to an embodiment of the present invention. FIG. 1 is a schematic end view of a tank of a power generation system according to an embodiment of the present invention. 1 is a schematic perspective view of a power generation system according to an embodiment of the present invention. 1 is a schematic side view of a power generation system according to an embodiment of the present invention. 1 is a schematic side view of a power generation system according to an embodiment of the present invention.

Hereinafter, each embodiment of the present invention will be described with reference to the drawings and the like. However, the present invention can be implemented in various forms without departing from the gist thereof, and should not be construed as being limited to the contents described in the embodiments exemplified below.

In order to make the explanation clearer, the drawings may schematically represent the width, thickness, shape, etc. of each part compared to the actual aspect, but these are only examples and do not limit the interpretation of the present invention. It's not something you do. In this specification and each figure, the same reference numerals may be given to elements having the same functions as those explained in relation to the previous figures, and redundant explanation may be omitted.

Hereinafter, a pumped storage power generation tank and a power generation system including the pumped storage power generation tank according to one embodiment of the present invention will be described.

1. Power Generation System A schematic diagram of the power generation system 100 is shown in FIG. The power generation system 100 is a system that can realize pumped storage power generation using seawater, river water, and groundwater (hereinafter collectively referred to as power generation water) at a low cost, and is a power generation water system according to one embodiment of the present invention. It includes a pumped storage power generation tank (hereinafter also simply referred to as a tank) 110 for storing water. A water supply and drainage pipe 102 for supplying water for power generation is connected to the tank 110, and a power generation unit 140 including a water wheel 144 and a generator 142 is connected to the water supply and drainage pipe 102.

The tank 110 is placed on the land side with respect to the coastline or river. Tank 110 is arranged so that the liquid level of power generation water stored therein is higher than water turbine 144 . There is no restriction on the number of tanks 110 included in the power generation system 100, and it may be one or more. Details of the structure of the tank 110 will be described later.

The water supply and drainage pipe 102 connects the tank 110 to the sea, river, or underground water vein to supply power generation water to the tank 110, and also serves as a water flow path for discharging the power generation water stored in the tank 110 into the sea or river during power generation. functions as Thus, one end 102a is connected to the tank 110 and the other end 102b is connected to the sea, river, or groundwater vein. The end portion 102b is arranged at a position lower than the sea level or the water level of a river at low tide so that water for power generation can be supplied at any time. On the other hand, the end 102a is located at a higher position than the end 102b and is connected to the lower part of the tank 110. Thereby, potential energy for power generation is given to the water for power generation stored in the tank 110. By discharging the water for power generation into the sea or 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 on-off valve 104, and the flow of power generation water in the water supply and drainage pipe 102 is controlled by controlling the on-off valve 104.

A power transmission line (not shown) is connected to the generator 142 of the power generation unit 140 to supply the generated power to an external load (not shown) and to receive the power necessary for pumping water for power generation from an external power source. be done. The generator 142 is preferably provided at a position higher than the sea level or the water level of a river, for example on land. This arrangement facilitates maintenance of generator 142. On the other hand, the water turbine 144 is arranged at a position lower than the sea level or the water level of a river, and is connected to a water supply and drainage pipe. Therefore, the water turbine 144 is located lower than the liquid level of the power generation water stored in the tank 110, and when the power generation water in the tank 110 is discharged into the sea or river, it is rotated by the power generation water, and as a result, , the generator 142 is driven to generate electrical energy. Conversely, when pumping water for power generation into the tank 110, the water wheel 144 is rotated in the opposite direction by the power supplied to the generator 142, thereby generating power from the sea, river, or underground water source via the water supply and drainage pipe 102. Water is stored in tank 110. For the power at this time, so-called surplus power may be used, or renewable energy power obtained from solar power generation, wind power generation, etc. may be used. By using surplus electricity, water for power generation can be pumped up at low cost, and it is possible to prevent excessive supply of electricity from base load power sources such as nuclear power plants and thermal power plants. On the other hand, by generating electricity at times when the demand for electricity increases, it is possible to alleviate the tight demand for electricity. Further, since power generation can be started simply by operating the on-off valve 104, the present power generation system 100 can also be used as an emergency power source or a black start power source. Although not shown, when assembling water for power generation, a separately installed pump may be used instead of the power generation unit 140.

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, as shown in FIG. 2B, a plurality of tanks 110 may be connected to one power generation unit 140. 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, water for power generation can be pumped up using a plurality of water turbines 144 (or pumps) as indicated by dotted arrows, so water for power generation can be more quickly supplied to the plurality of tanks 110. Furthermore, by appropriately using the on-off valve 104, water for power generation can be supplied from multiple tanks 110 to one power generation unit 140 (see solid line arrow), so the number of generators 142 can be reduced. As a result, it is also possible to construct the power generation system 100 at lower cost.

2. Tank Structure A schematic perspective view and an end view of a tank 110 according to one embodiment of the present invention are shown in FIGS. 4 and 5, respectively. 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.

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

The floating roof 114 is not fixed to the main body 112 and is provided so as to float on the stored power generation water. Therefore, it moves up and down depending on the amount of water stored for power generation (see solid line arrows in FIG. 5). A seal 116 is provided around the outer periphery of the floating roof 114 to prevent water for power generation from flowing out or evaporating from the gap between the floating roof 114 and the main body 112. Since the floating roof can also function as a weight that can exert pressure on the stored power generation water, it can increase the flow rate of power generation water supplied to the water turbine 144 during power generation, contributing to an increase in power generation efficiency. It is preferable that the floating roof 114, especially the inside (lower surface) of the floating roof 114 that comes into contact with power generation water, be coated with the above-described coating or provided with a waterproof sheet.

A rotating ladder 118 may be further installed in the tank 110, and although not shown, it supplies a rotating staircase, a wind girder to prevent deformation of the main body 112 due to wind pressure, and steam to melt snow on the floating roof 114. A snow melting pipe or the like may be provided for this purpose. Furthermore, a drain valve 120 for introducing rainwater accumulated in the floating roof 114 into the main body 112, a drain pipe 122 for passing the rainwater through the main body 112 and discharging it to the outside of the tank 110, etc. may be provided. The drain valve 120 is closed in a steady state, and is opened when rainwater is introduced into the main body 112. By introducing rainwater into the body 112 using the drain valve 120, it is also possible to supply the body 112 with water for generating electrical energy without using an external power source. Further, when the tank 110 is filled with the maximum allowable amount of water for power generation, the rainwater accumulated on the floating roof 114 can be discharged to the outside of the tank 110 by using the drain pipe 122.

Furthermore, tank 110 may have multiple solar panels 150 disposed on floating roof 114. Further, the solar panel 150 may be provided on the side surface of the main body 112. Furthermore, as shown in FIG. 6, the solar panel 150 may be provided so as to cover the entire top and side surfaces of the tank 110, that is, the entire surface of the floating roof 114 and the entire side surface of the main body 112. As shown in FIG. 7, by providing solar panels 150 on the side surfaces of the main bodies 112 of the plurality of tanks 110, sunlight reflected on the side surfaces of the tanks 110 can be supplied to the solar panels 150 of adjacent tanks 110. can. Therefore, it is possible to generate power even with the solar panel 150 on the side surface that is not directly irradiated with sunlight, so that power can be generated more efficiently.

In order to perform solar power generation more efficiently, the tank 110 may be configured so that the floating roof 114 can rotate (rotate) about its central axis, as shown by the arrow in FIG. Thereby, the irradiation angle of sunlight to the solar panel 150 installed on the floating roof 114 can be optimized. For example, as shown in FIGS. 8A and 8B, one or more drive rollers 154 may be provided inside the body 112 for rotating the floating roof 114. By rotating the drive roller 154 in the direction shown by the solid line arrow while keeping its position fixed, a frictional force between the drive roller 154 and the floating roof 114 acts, and the floating roof 114 can be rotated (see the chain line 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 a plurality of ribs 114a that engage with the surface of the drive roller 154 may be provided on the upper surface of the floating roof 114. Note that, as described above, since the floating roof 114 moves up and down depending on the amount of power generation water in the tank 110, the main body 112 is provided with a moving mechanism 156 for moving the drive roller 154 up and down. Although not shown, a screw may be provided on the lower surface of the floating roof 114 instead of the drive roller 154, and the floating roof 114 may be rotated using the screw.

Furthermore, the solar panel 150 may be installed on the ground of the site where the tank 110 is constructed. Solar panel 150 may be a flexible solar panel. By using flexible solar panels 150, solar panels 150 can be installed at high density so as to match the shape of the side surface of main body 112. By providing the solar panel 150, the electricity generated during the day can be used to pump up water for power generation, and when the tank 110 is sufficiently filled with water for power generation, it can be used to pump up water for power generation. Can supply electricity.

Further, the tank 110 may further include a power storage device 152 that stores power generated by the solar panel 150. Power storage device 152 may be installed on floating roof 114 or outside tank 110. Further, one power storage device 152 may be connected to solar panels 150 provided in a plurality of tanks 110. The power storage device 152 is connected to the water wheel 144 and is configured to drive the water wheel 144 to supply water for power generation to the main body 112 . If such a configuration is adopted, the power generated by the solar panel 150 during the day can be stored in the power storage device 152, and this power can be used to pump water for power generation at night, so the power storage device 152 can be used as an auxiliary power source for pumping water. can be used.

Such a tank 110 can be provided, for example, by repurposing a tank for storing or stockpiling fossil fuels such as crude oil (hereinafter, these are collectively referred to as crude oil storage tanks). Since petroleum storage tanks are usually constructed at a position several meters to more than ten meters higher than the sea level or river water level, they can secure sufficient potential energy for power generation. In this case, the crude oil storage tank is used as the tank 110 after the crude oil remaining inside is discharged and the inside is cleaned. At this time, the above-mentioned coating may be applied to prevent corrosion by seawater.

In recent years, there have been dramatic advances in energy-saving technology, typified by electric vehicles and hybrid vehicles, and the fuel used in thermal power generation is shifting from crude oil to natural gas. Furthermore, there is a trend toward decarbonization with the aim of achieving carbon neutrality, and crude oil consumption is decreasing. As a result, unnecessary crude oil storage tanks now exist all over the country. Such crude oil storage tanks are usually installed in coastal areas such as port areas and industrial areas, so by repurposing the oil storage tank and providing it as tank 110, it is possible to install a new crude oil storage tank without demolishing it. The cost for constructing tank 110 is suppressed. Furthermore, since the coastal area has a well-developed power transmission network, the power generation system 100 can be constructed at low cost by reusing crude oil storage tanks. Furthermore, since the oil storage tank has an extremely large volume, large-scale power generation is possible by using the power generation system 100 in which the oil storage tank can be used for other purposes.

Traditionally, pumped storage power generation has been carried out mainly through dams and reservoirs built in mountainous areas, but such pumped storage power generation requires enormous costs and time to construct dams and reservoirs. and cause environmental destruction. In addition, suitable sites for large-scale dams and reservoirs are limited. Furthermore, the amount of power generated is greatly influenced by the climate, that is, the amount of rainfall. However, by using the present power generation system 100, not only can existing equipment be used as a "dam", but also water for power generation can be discharged into the sea or river during power generation, so there is no need to construct a reservoir. This not only eliminates the cost and time required to acquire new land, but also allows new power plants to be built without placing any burden on the environment. Furthermore, since seawater exists in virtually inexhaustible quantities, a stable power supply is possible regardless of the weather.

3. Modifications of the tank (1) Modification 1
The structure of tank 110 is not limited to the structure described above. For example, as shown in FIG. 10A, the tank 110 may include an auxiliary tank 124 on the floating roof 114 that can store water for power generation. The auxiliary tank 124 is connected to an auxiliary water supply pipe 128, and the auxiliary water supply pipe 128 is provided with a valve 126. The auxiliary water supply pipe 128 internally connects the auxiliary tank 124 and the main body 112 via the floating roof 114, and functions as a path for transporting water for power generation between the main body 112 and the auxiliary tank 124. When the valve 126 is opened with power generation water filled in the main body 112, 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 transferred to the auxiliary tank by the auxiliary water supply pipe 128. 124 (see practical arrow in FIG. 10B). Thereafter, by closing the valve 126, the movement of the power generation water is stopped, 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, water for power generation is supplied from the water supply and drainage pipe 102 to the power generation unit 140 (see the dotted arrow in FIG. 10B). 124, and the weight of the power generation water in the auxiliary tank 124. That is, pressure can be applied in the vertical direction to the power generation water in the main body 112 by the floating roof 114, the auxiliary tank 124, and the power generation water in the auxiliary tank 124 (see the white arrow in FIG. 10B). As a result, the flow rate of power generation water supplied to the power generation unit 140 increases, and the power generation efficiency of the power generation unit 140 can be increased.

(2) Modification 2
As mentioned above, in this power generation system 100, an existing crude oil storage tank can be repurposed, but the tanks that can be repurposed are not limited to crude oil storage tanks, but also various types that can seal liquids such as water, liquefied gas, and chemicals. Tanks may be repurposed. For example, as shown in FIG. 11A, a tank for storing river water, groundwater, cooling water, radioactively contaminated water, treated water, etc. that can be used as industrial water may be used as the tank 110. Alternatively, as shown in FIG. 11B, a spherical tank for storing liquefied gas may be used as the tank 110. When repurposed, cleaning and decontamination will be performed as appropriate, and the interior will be coated if necessary.

Unlike a crude oil storage tank, such a tank 110 is not provided with a floating roof, and as shown in FIG. 12, the main body 112 is configured to be airtight. Therefore, the internal volume of tank 110 is constant. Therefore, when storing water for power generation, a pressure regulating valve 130 is provided to exclude internal air. This pressure regulating valve 130 may be opened or closed when water for power generation is stored. In the former case, even if the liquid level of the power generation water moves upward as the power generation water is supplied, pressure increase in the space 112a above it can be prevented, so the power generation water can be quickly supplied. can be supplied. 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 water for power generation is supplied. In this case, since the space 112a is compressed, resistance is created in the supply of power generation water, but during power generation, the flow rate of power generation water can be increased by applying pressure to the power generation water using the pressure in the space 112a. This enables highly efficient power generation.

4. Utilization of Wind Power As mentioned above, for example, an existing crude oil storage tank can be repurposed as the tank 110. Existing crude oil storage tanks are usually installed in multiple locations on a vast site, so by using these sites to generate wind power at the same time, large-scale power generation becomes possible. Additionally, existing crude oil storage tanks are typically constructed away from residential and tourist areas, making it possible to provide new power plants without causing negative impacts on the landscape.

For example, as shown in FIG. 13, a propeller-type wind power generator 160 for generating power using wind flowing above the tanks 110 may be provided between adjacent tanks 110. The number and spacing of the propeller-type wind power generators 160 may be appropriately set depending on the number of tanks 110 and the site area where the tanks 110 are provided. Note that, in order to utilize the wind flowing above the tank 110, the rotating shaft of the propeller of the propeller-type wind power generator 160 is installed at a position higher than the height of the tank 110.

Alternatively, as shown in FIG. 14A, a wind power generator may be provided between adjacent tanks 110 to generate power using wind (draft) flowing between adjacent tanks 110. The wind power generator in this case may be a propeller type wind power generator or may be a Darius type wind power generator 162 having a more compact structure. Alternatively, a fixing wire 164 may be provided between adjacent tanks 110, and a plurality of small wind power generators 166 fixed to the wire 164 may be provided. The number of wires 164 and the number of wind power generators fixed to each wire 164 also take into account the height of the tank 110, the distance between adjacent tanks 110, the strength of the wire 164, the size and weight of the wind power generator 166, etc. It may be determined as appropriate.

The above-described propeller type wind power generator 160, Darius 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 utilized in a timely manner.

The embodiments described above as embodiments of the present invention can be implemented in appropriate combinations as long as they do not contradict each other. In addition, the present invention also applies to those in which the business operator appropriately adds, deletes, or changes the design of components based on the display device of each embodiment, or adds or omits processes, or changes the conditions. As long as it has the gist of the above, it is within the scope of the present invention.

Even if the effects are different from those brought about by the aspects of each of the embodiments described above, those that are obvious from the description of this specification or that can be easily predicted by those skilled in the art will, of course, be included. It is understood that this invention is brought about by the present invention.

100: power generation system, 102: water supply and drainage pipe, 102a: end, 102b: end, 104: opening/closing valve, 110: pumped storage power generation 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 adjustment valve, 140 : power generation unit, 142: generator, 144: water turbine, 150: solar panel, 152: power storage device, 154: drive roller, 156: moving mechanism, 160: propeller type wind generator, 162: Darius type wind generator, 164: Wire, 166: Wind generator

Claims (13)

a main body functioning as a container for storing seawater, groundwater, or river water; and a floating roof located on the main body and floating above the seawater, groundwater, or river water stored in the main body,
The main body is a pumped storage power generation tank connected to a water supply and drainage pipe connected to a power generation unit. The pumped storage power generation tank according to claim 1, wherein the inside of the main body and the floating roof are coated with a fluorine-containing resin, fiber-reinforced plastic, glass, a ceramic-containing resin, or a seawater-resistant waterproof sheet. the auxiliary tank on the floating roof;
an auxiliary water supply pipe connecting the auxiliary tank and the main body via the floating roof and transporting seawater, groundwater, or river water between the auxiliary tank and the main body; and the seawater in the auxiliary water pipe. The tank for pumped storage power generation according to claim 1, further comprising a valve that controls the flow of water in the tank, groundwater, or river. The pumped storage power generation tank according to claim 1, further comprising a rotating ladder on the floating roof. The pumped storage power generation tank according to claim 1, further comprising a wind girder. further comprising a drain pipe for discharging water on the floating roof,
The pumped storage power generation tank according to claim 1, wherein the drain pipe passes through the inside of the main body. The pumped storage power generation tank according to claim 1, further comprising a drain valve for introducing water on the floating roof into the main body. The pumped storage power generation tank according to claim 1, wherein the floating roof is configured to rotate. The interior is configured to be open or sealed,
It has a history of being used as a tank to store fossil fuels, radioactively contaminated water, or industrial water;
A tank for pumped storage power generation that is connected to the water supply and drainage pipes connected to the power generation unit. The pumped storage power generation tank according to claim 9, further comprising a pressure adjustment valve for adjusting the internal pressure. The pumped storage power generation tank according to claim 1 or 9, further comprising a plurality of solar panels. The pumped storage power generation tank according to claim 11, wherein the plurality of solar panels are arranged on the entire upper surface and the entire side surface of the pumped storage power generation tank. Further comprising a power storage device for storing power generated by the solar panel,
The pumped storage power generation tank according to claim 11, wherein the power storage device is configured to drive the power generation unit.

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