A pumped storage system based on offshore wind power single pile group and use method

Abstract

The present invention relates to the field of offshore wind power technology, and in particular to a pumped storage system based on an offshore wind power monopile group and a method of use. A pumped storage system based on an offshore wind power monopile group comprises: at least one water inlet monopile and at least one water storage monopile, the water inlet monopile and the water storage monopile are partially inserted into the seabed respectively, a first accommodating space is provided in the water inlet monopile, the first accommodating space is suitable for introducing and accommodating seawater, the water storage monopile is provided with a second accommodating space, the second accommodating space is suitable for accommodating seawater, and the bottom surface height of the first accommodating space is higher than the bottom surface height of the second accommodating space; a water diversion tunnel is provided with a first hole opening and a second hole opening, the first hole opening is connected to the first accommodating space, and the second hole opening is connected to the second accommodating space; a hydro-turbine generator set is arranged in the water diversion tunnel. The present invention solves the problem that the life of a monopile is longer than the life of a wind turbine generator set, and the monopile is idle for a long time after the wind turbine generator set expires, resulting in a waste of resources.

Description

Technical Field

[0001] The present invention relates to the technical field of offshore wind power, and in particular to a pumped storage system based on an offshore wind power single pile group and a use method thereof. Background Art

[0002] Offshore wind power generation is a key development area in the field of new energy. In offshore wind power projects, single pile foundations are widely used because of their advantages such as small footprint, simple structure, quick construction and low cost.

[0003] Conventional pumped storage uses water as a storage medium to store and manage electric energy through the conversion of electric energy and potential energy. Conventional pumped storage power stations generally combine site conditions such as hills, rivers or lakes, use electricity during low power load periods to pump water to the upper reservoir, and then release water to the lower reservoir to generate electricity during peak power load periods. Excess electric energy can be converted into high-value electric energy during peak power grid periods, which is suitable for frequency and phase modulation, and stabilizes the cycle and voltage of the power system. Conventional pumped storage is the most mature, most economical and most suitable energy storage method for large-scale development. It is a green, low-carbon, clean and flexible power source for the power system.

[0004] For offshore wind power, the design life of a wind turbine is generally 25 to 30 years, but the design life of a single pile structure is generally 50 years. The life of a single pile is longer than the life of a wind turbine. This leads to the problem of long-term idleness or demolition of single piles after the service life of a wind turbine expires, resulting in a waste of resources. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the problem in the prior art that the life of a single pile of an offshore wind turbine is longer than the life of a wind turbine generator set, which leads to the problem that the single pile is idle for a long time after the service life of the wind turbine generator set expires, and there is a defect of waste of resources, thereby providing a pumped storage system based on an offshore wind power single pile group and a method of use.

[0006] In order to solve the above problems, the present invention provides a pumped storage system based on an offshore wind power monopile group, comprising:

[0007] At least one water inlet pile and at least one water storage pile, the water inlet pile and the water storage pile are partially inserted into the seabed respectively, the water inlet pile is provided with a first accommodating space, the first accommodating space is suitable for introducing and accommodating seawater, the water storage pile is provided with a second accommodating space, the second accommodating space is suitable for accommodating seawater, and the bottom surface height of the first accommodating space is higher than the bottom surface height of the second accommodating space;

[0008] A water diversion tunnel, wherein the water diversion tunnel is provided with a first hole and a second hole, wherein the first hole is connected to the first accommodation space, and the second hole is connected to the second accommodation space, and the height of the first hole is higher than the height of the second hole;

[0009] The hydro-generator set is arranged in the water diversion tunnel.

[0010] Optionally, the water diversion tunnel is arranged at an angle, and a first gate is provided in the water diversion tunnel.

[0011] Optionally, a water inlet and an operation and maintenance water outlet are provided on the side wall of the water inlet single pile, the water inlet is lower than the sea level, the height of the water outlet is higher than the sea level, each water inlet is provided with a water inlet valve, and the water outlet is provided with a water outlet valve.

[0012] Optionally, the water storage pile has a drainage pump and a drainage pipe in it, the water storage pile is provided with a drainage outlet, the drainage outlet is provided with a drainage valve, the drainage outlet is higher than the sea level, and the water suction port of the drainage pipe is provided at the bottom of the second accommodating space.

[0013] Optionally, the bottom of the second accommodating space of the water-storage single pile is provided with a bottom seal or an underground cave, and the bottom of the first accommodating space is provided with a bottom seal.

[0014] Optionally, a first installation platform is provided in the first accommodating space, the first installation platform is arranged above the sea surface, and a first control box is provided on the first installation platform.

[0015] Optionally, a second mounting platform is provided in the second accommodating space, and a drainage pump is provided on the second mounting platform.

[0016] Optionally, a water storage tunnel is provided between adjacent water storage piles, a hydro-generator set is provided in the water storage tunnel, and a second gate is provided in the water storage tunnel.

[0017] Optionally, a power generation component or an energy storage component is provided on the top of the water inlet monopile and the water storage monopile, and the power generation component or the energy storage component is connected to the substation.

[0018] A method for using a pumped storage system based on an offshore wind power single pile group. Normally, seawater is introduced into a first storage space. When the power grid needs to generate electricity, the first storage space is connected to the outside of the water inlet pile, and the seawater outside the water inlet pile and the seawater in the first storage space enter through a first hole of a water diversion tunnel, impact a hydro-generator set to generate electricity, and reach a second hole to enter a second storage space.

[0019] The technical solution of the present invention has the following advantages:

[0020] 1. The pumped storage system based on the offshore wind power monopile group provided by the present invention comprises: at least one water inlet monopile and at least one water storage monopile, the water inlet monopile and the water storage monopile are partially inserted into the seabed respectively, a first accommodating space is provided in the water inlet monopile, the first accommodating space is suitable for introducing and accommodating seawater, the water storage monopile is provided with a second accommodating space, the second accommodating space is suitable for accommodating seawater, the bottom surface height of the first accommodating space is higher than the bottom surface height of the second accommodating space; a water diversion tunnel, the water diversion tunnel is provided with a first hole opening and a second hole opening, the first hole opening is connected to the first accommodating space, the second hole opening is connected to the second accommodating space, the height of the first hole opening is higher than the height of the second hole opening; a hydro-turbine generator set is arranged in the water diversion tunnel.

[0021] Normally, seawater is introduced into the first accommodation space; when the power grid needs to generate electricity, the first accommodation space is connected to the outside of the water inlet pile, and the seawater outside the water inlet pile and the seawater in the first accommodation space enter the impact turbine generator set through the first hole of the water diversion tunnel to generate electricity, and then reach the second hole to enter the second accommodation space. By setting the water diversion tunnel, the first accommodation space of the water inlet pile and the second accommodation space of the water storage pile are connected, and the height difference between the first hole and the second hole is used to impact the turbine generator set using the mechanical energy of the seawater, so as to realize the power generation function, so as to transmit the generated electricity to the power grid. When the power grid has excess electricity, the seawater in the water storage pile and the water storage tunnel is discharged into the ocean. By setting the water inlet pile, the water storage pile and the water diversion tunnel, combined with the marine environment and the pile group, a pumped storage system is constructed. After the service of the wind turbine generator set expires until the life of the pile expires, the problem of long-term idleness or removal of the pile is solved. At the same time, it can also provide power generation, peak-to-valley shifting, frequency regulation, phase regulation and other services for the power grid.

[0022] 2. The pumped storage system based on the offshore wind power single pile group provided by the present invention has a water diversion tunnel that is inclined, a first gate is provided in the water diversion tunnel, and the inclined water diversion tunnel connects the bottom of the first accommodating space and the bottom of the second accommodating space.

[0023] 3. The present invention provides a pumped storage system based on an offshore wind power single pile group. The side wall of the water inlet single pile is provided with a water inlet and an operation and maintenance outlet. The water inlet is below the sea level, and the operation and maintenance outlet is above the sea level. The water inlet is provided with an inlet valve, and the operation and maintenance outlet is provided with an outlet valve. The water inlet is connected with an inlet pipe, and the operation and maintenance outlet is connected with an operation and maintenance drain pipe. By setting up a pumped storage system with a single pile group, when there is surplus electricity, the surplus electricity is used to lift the seawater in the water inlet single pile, the water diversion tunnel and the accommodating space, and discharge it into the sea through the operation and maintenance drain pipe and the operation and maintenance outlet; when power generation is needed, the water inlet valve is opened to allow seawater to enter the interior of the single pile through the water inlet pipe, flow through the turbine generator, and generate electricity. The water inlet is below the sea level, and the sea level changes with astronomical, meteorological and other factors, ensuring that the water inlet is always located below the sea level.

[0024] 4. The present invention provides a pumped storage system based on an offshore wind power single pile group, a drainage pump and a drainage pipe are provided in the water storage single pile, the drainage pipe is provided with a drainage outlet, the drainage outlet is provided with a drainage valve, the drainage outlet is higher than the sea level, so that the drainage outlet is higher than the sea level for drainage, and the water pumping port of the drainage pipe is arranged at the bottom of the second accommodating space.

[0025] 5. In the pumped storage system based on offshore wind power monopile group provided by the present invention, the bottom of the second storage space of the water storage monopile is provided with a bottom seal or an underground cavern, and the sealing of the bottom of the second storage space is ensured by the bottom seal, and the underground cavern can accommodate more seawater. The bottom of the first storage space is provided with a bottom seal to keep the first storage space sealed.

[0026] 6. The pumped storage system based on the offshore wind power single pile group provided by the present invention has a first installation platform in the first accommodating space, the first installation platform is arranged above the sea surface, and a first control box is arranged on the first installation platform, and the equipment in the water inlet single pile is automatically controlled by the first control box.

[0027] 7. In the pumped storage system based on the offshore wind power single pile group provided by the present invention, a second installation platform is provided in the second accommodation space, a drainage pump is provided on the second installation platform, and the second control box controls the drainage pump.

[0028] 8. In the pumped storage energy system based on offshore wind power monopile groups provided by the present invention, a water storage tunnel is provided between adjacent water storage monopiles, a hydro-generator set is provided in the water storage tunnel, and a second gate is provided in the water storage tunnel. The height difference of the seawater in two adjacent water storage monopiles is controlled by the second gate, and by opening the second gate in the water storage tunnel, the seawater impacts the hydro-generator set in the water storage tunnel to generate electricity.

[0029] 9. The present invention provides a pumped storage system based on an offshore wind power single pile group, in which a power generation component or an energy storage component is provided on the top of the water inlet pile and the water storage pile. The power generation component or the energy storage component is connected to the substation, and cooperates with the turbine generator set of the pumped storage system to realize functions such as power generation and energy storage, thereby maximizing the utilization value of the single pile. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A schematic diagram of a pumped storage system based on an offshore wind power monopile group provided in an embodiment of the present invention (series arrangement);

[0032] Figure 2 It is a schematic diagram of one mode of a pumped storage system based on an offshore wind power single pile group provided in an embodiment of the present invention (simplified layout, only two piles).

[0033] Figure 3 A schematic diagram of a pumped storage system based on an offshore wind power monopile group provided in an embodiment of the present invention (branch arrangement one, multiple water-inlet monopiles);

[0034] Figure 4 A schematic diagram of a pumped storage system based on an offshore wind power monopile group provided in an embodiment of the present invention (branch arrangement 2, multiple water storage monopiles);

[0035] Explanation of the reference numerals: 1. Water inlet pile; 101. First accommodating space; 102. First control box; 103. First installation platform; 104. Water inlet; 105. First operation and maintenance channel; 106. Operation and maintenance water outlet; 107. Operation and maintenance pump; 108. Operation and maintenance drainage pipe; 2. Water diversion tunnel; 201. First gate; 202. Hydro-generator set; 3. Water storage pile; 301. Second accommodating space; 302. Second installation platform; 303. Bottom cover; 304. Underground cavern; 305. Drainage pump; 306. Drainage pipe; 307. Drainage outlet; 308. Third installation platform; 309. Second control box; 310. Second operation and maintenance channel; 4. Water storage tunnel; 5. Sea surface; 6. Seabed. DETAILED DESCRIPTION

[0036] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0038] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0040] Example 1

[0041] like Figure 1 A specific implementation of a pumped storage system based on an offshore wind power monopile group is shown, comprising: a water intake monopile 1 and two water storage monopile 3, arranged in series.

[0042] like Figure 1 As shown, the water-intake monopile 1 has a first accommodating space 101, which is suitable for accommodating seawater, and part of the first accommodating space 101 is located below the sea surface 5. Figure 1 As shown, water inlets 104 and operation and maintenance water outlets 106 at different heights are provided on the side walls of the first accommodating space 101. It should be noted that the elevation of at least one operation and maintenance water outlet 106 must be higher than the elevation of the sea level 5 in different seasons, and the height of at least one water inlet 104 must be lower than the lowest height of the sea level 5 in different seasons. Each water inlet 104 is provided with an inlet valve, the water inlet 104 is connected to an inlet pipe, the operation and maintenance water outlet 106 is connected to an operation and maintenance drain pipe 108, and an operation and maintenance pump 107 is provided at the bottom of the operation and maintenance drain pipe 108. Specifically, the water inlet valve is an electric valve. When taking in water, the water inlets 104 are opened respectively, and water is taken in through the water inlet pipe from the water inlet 104 located below the sea level 5. As shown Figure 1 As shown, a first installation platform 103 is provided in the water-inlet monopile 1, and the first installation platform 103 is higher than the sea surface 5 to prevent the seawater in the first accommodation space 101 from submerging the first installation platform 103. A first control box 102, power transmission and transformation equipment, lighting lamps, batteries and other equipment are placed above the first installation platform 103. The first control box 102 is respectively connected to the power transmission and transformation equipment, batteries, lighting lamps, water pumps and other lines to realize the power transmission and transformation, lighting, power storage, operation and maintenance drainage power supply functions. Figure 1As shown, a first operation and maintenance channel 105 is provided in the water inlet pile 1, so that personnel can enter the first accommodation space 101 to repair and maintain the relevant equipment inside. To achieve a sealing effect, a bottom seal 303 is provided at the bottom of the first accommodation space 101. It should be noted that in order to facilitate the emptying of the seawater in the water inlet pile 1, the water inlet pile 1 is powered by an operation and maintenance pump 107, so that the water in the first accommodation space 101 is discharged through the operation and maintenance drainage pipe 108 and the operation and maintenance outlet 106.

[0043] like Figure 1 As shown, the structures of the two water storage piles 3 are the same except for the bottom. Each water storage pile 3 is provided with a second accommodating space 301, which is suitable for accommodating seawater, and the bottom surface of the second accommodating space 301 is lower than the bottom surface of the first accommodating space 101. Figure 1 As shown, the bottom of the second accommodation space 301 of one water storage pile 3 is provided with a bottom cover 303, and the bottom of the second accommodation space 301 of another water storage pile 3 is provided with an underground cave 304, and the capacity of the second accommodation space 301 of the water storage pile 3 is further expanded through the underground cave 304. Figure 1 As shown, there are drainage pumps 305 and drainage pipes 306 in the water storage pile 3. The drainage pipe 306 is provided with at least two drainage ports 307 at different heights. Each drainage port 307 is provided with a drainage valve. The drainage ports 307 are higher than the sea level 5. The water inlet of the drainage pipe 306 is provided at the bottom of the second accommodation space 301. Specifically, the drainage valve is an electric valve. It should be noted that the highest drainage port 307 should be higher than the sea level 5 at different time periods, so as to ensure that the seawater in the water storage pile 3 is easily discharged above the sea level 5 at any time period. Figure 1 As shown, a second mounting platform 302 is provided in the second accommodation space 301 , and a drainage pump 305 is provided on the second mounting platform 302 . The drainage pump 305 is connected to a drainage pipe 306 through a pipeline to discharge the seawater in the second accommodation space 301 .

[0044] like Figure 1 As shown, a third installation platform 308 is provided in the water storage pile 3, and the third installation platform 308 is higher than the sea surface 5 to prevent the third installation platform 308 from being submerged by the seawater in the second accommodation space 301. A second control box 309, power transmission and transformation equipment, lighting and batteries are placed above the third installation platform 308. The second control box 309 is respectively connected to the power transmission and transformation equipment, batteries, lighting, drainage pump 305 and drainage valve circuit to realize the functions of power transmission and transformation, lighting and electricity storage. Figure 1 As shown, a second operation and maintenance channel 310 is provided in the water storage monopile 3, so that personnel can enter the second accommodation space 301 to repair and maintain the relevant equipment inside. It should be noted that, generally speaking, the third installation platform 308 and the first installation platform 103 are both used as much as possible as the original internal platform of the offshore wind power monopile.

[0045] To achieve the connection between the adjacent water inlet pile 1 and the water storage pile 3, as Figure 1 As shown, it also includes a water diversion tunnel 2, which is provided with a first hole and a second hole, the first hole communicating with the first accommodation space 101, and the second hole communicating with the second accommodation space 301, and the height of the first hole is higher than the height of the second hole, so that the seawater in the first accommodation space 101 enters the second accommodation space 301 through the water diversion tunnel 2. Figure 1 As shown, a first gate 201 is provided at the first opening of the water diversion tunnel 2, and a hydro-turbine generator set 202 is provided at the second opening. By opening the first gate 201, seawater enters the first opening of the water diversion tunnel 2 to impact the hydro-turbine generator set 202 for power generation, and finally reaches the second opening to enter the second accommodating space 301.

[0046] To connect adjacent water storage piles 3, Figure 1 As shown, it also includes a water storage tunnel 4, which is horizontally arranged, and a hydro-generator set 202 is arranged in the water storage tunnel 4, and a second gate is arranged in the water storage tunnel 4. When the water level difference in the second accommodation space 301 of the two water storage piles 3 is large, by opening the second gate, the seawater in the water storage pile 3 with a higher water level impacts the hydro-generator set 202 to generate electricity, and finally enters the second accommodation space 301 of the water storage pile 3 with a lower water level until the height difference between the two water storage piles 3 disappears. It should be noted that the entrances of the water diversion tunnel 2 and the water storage tunnel 4 are provided with a trash screen to prevent sludge and the like from having an adverse effect on the gate or the hydro-generator set 202. In addition, the water diversion tunnel 2 and the water storage tunnel 4 are both located below the seabed 6, which is conducive to enhancing the horizontal bearing capacity of the water inlet pile 1 or the water storage pile 3, and has additional benefits.

[0047] It does not affect the use of the water inlet pile 1 and the water storage pile 3. The tops of the water inlet pile 1 and the water storage pile 3 can be provided with power generation components or energy storage facilities that are rebuilt after the original wind turbine generator set expires.

[0048] A method for using a pumped storage system based on an offshore wind power single pile group comprises the following steps:

[0049] (1) In normal times, the water inlet valve is controlled in combination with changes in sea level, and as much seawater as possible is introduced into the first accommodation space 101 from the water inlet pile 1, for example, until the first preset height is reached. When the power grid needs to generate electricity, there is almost no seawater in the second accommodation space 301. The first control box 102 simultaneously opens the water inlet valve of the water inlet 104, and seawater is continuously added to the first accommodation space 101. The first gate 201 is opened, and the seawater moves along the inclined water diversion tunnel 2, impacting the turbine generator set 202 to convert mechanical energy into electrical energy, until the seawater in the second accommodation space 301 of the water storage pile 3 connected to the water diversion tunnel 2 reaches the second preset height, wherein the electricity generated by the turbine generator set 202 in the water diversion tunnel 2 is converted into electrical energy during the peak load period of the power grid, that is, used for frequency and phase modulation, and assists in stabilizing the cycle and voltage of the entire power system;

[0050] (2) When the seawater in the second accommodation space 301 of the water storage pile 3 connected to the water diversion tunnel 2 reaches the second preset height, there is almost no seawater in the second accommodation space 301 of the water storage pile 3 not connected to the water diversion tunnel 2, and the second gate is opened. Due to the height difference between the two water storage piles 3, the seawater impacts the turbine generator set 202 in the water storage tunnel 4 to achieve power generation, until the seawater in the two water storage piles 3 is flush, and the electricity generated by the turbine generator set 202 in the water storage tunnel 4 is converted into electricity during the peak period of the power grid, which is suitable for frequency modulation and phase modulation, and assists in stabilizing the cycle and voltage of the entire power system;

[0051] (3) When the grid has surplus power, the drainage pumps 305 provided in the two water storage piles 3 are started respectively, and the surplus power is used to power the drainage pumps 305, thereby draining the seawater in the second accommodation space 301 of the two water storage piles 3 and the water storage tunnel 4, so that the seawater is discharged to the outside of the water storage piles 3 through the drainage port 307, so as to prepare for the next power generation. In addition, the surplus power can also provide power for the battery and the pile top energy storage device.

[0052] The pumped storage system based on offshore wind power single pile group provided by the present invention has the following advantages: (1) two or more single piles are combined and connected through a water diversion tunnel 2 and a water storage tunnel 4, and the ocean is used as an "upper reservoir" to form a certain head difference between the sea surface 5 and the pile bottom; (2) the internal space of the single pile and the water storage tunnel 4 are used as the "lower reservoir". By building an underground cavern 304 at the bottom of the single pile, the storage capacity of the "lower reservoir" can be further increased. Under this condition, when there is surplus electricity, the surplus water can be used to The surplus electricity is used to lift the seawater in the water storage pile, water storage tunnel 4 and underground cavern 304 and discharge it into the sea through the drain 307. Normally, the water inlet valve is controlled in combination with the changes in the sea level 5 to introduce as much seawater as possible into the water inlet pile 1. When power generation is required, the water inlet valve is opened to allow seawater to continue to enter the water inlet pile 1 and impact the turbine generator set 202 to generate electricity. This has technical feasibility and practical engineering significance. (3) It can be used for offshore wind power pile groups whose wind turbines have expired. The design life of the wind turbine group is about 25 to 30 years, but the design life of the single pile structure is 50 years. After the service life of the wind turbine generator set expires, the offshore single pile structure can still have good structural integrity and bearing capacity. Therefore, using the offshore wind power single pile group for the pumped storage system can give full play to the value of the offshore wind power single pile; (4) Only a small amount of equipment, water diversion tunnel 2 or underground cavern 304 needs to be added. The water diversion tunnel 2 can adopt non-excavation directional drilling technology or jacking construction technology, and the underground cavern 304 can adopt reverse construction. Both are mature processes. In addition, the newly built water diversion tunnel 2 and water storage tunnel 4 help to enhance the horizontal bearing capacity of the single pile; (5) The reuse of seawater mechanical energy is realized, that is, through the water diversion tunnel 2, the water storage tunnel 4, and the turbine generator in the water storage tunnel 4, the reuse of seawater mechanical energy is realized; (6) Combined with the conditions of the marine site and the expired single pile group, the application field of the single pile is expanded, the role of the single pile structure and its internal space is brought into play, and the pumped storage system is constructed to provide services for the power grid.

[0053] Example 2

[0054] The pumped storage system based on offshore wind power single pile group provided in this application is as follows: Figure 2 As shown, it includes a water inlet pile 1 and a water storage pile 3. The water inlet pile 1 and the water storage pile 3 are connected by a water diversion tunnel 2 to form a certain head difference. The rest of the structure is the same as that of Example 1.

[0055] Example 3

[0056] The pumped storage system based on offshore wind power single pile group provided in this application may also include: Figure 3 The schematic diagram shows a single pile group consisting of two water inlet piles 1, one water storage pile 3, and a water diversion tunnel 2 connecting the two. The rest of the structure is the same as that of Example 1.

[0057] Example 4

[0058] The pumped storage system based on offshore wind power single pile group provided in this application may also include: Figure 4 The schematic diagram shows a single pile group consisting of a water inlet single pile 1, two water storage single piles 3, and a water diversion tunnel 2 connecting the two. The rest of the structure is the same as that of Example 1.

[0059] Example 5

[0060] The pumped storage system based on offshore wind power single pile groups provided in the present application may also include several groups of reasonable combinations of embodiments 1 to 4.

[0061] Obviously, the above embodiments are merely examples for clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived from them are still within the protection scope of the invention.

Claims

1. A pumped storage system based on an offshore wind power single pile group, characterized in that: include: At least one water inlet pile (1) and at least one water storage pile (3), the water inlet pile (1) and the water storage pile (3) are partially inserted into the seabed (6) respectively, the water inlet pile (1) is provided with a first accommodating space (101), the first accommodating space (101) is suitable for introducing and accommodating seawater, the water storage pile (3) is provided with a second accommodating space (301), the second accommodating space (301) is suitable for accommodating seawater, and the bottom surface height of the first accommodating space (101) is higher than the bottom surface height of the second accommodating space (301); A water diversion tunnel (2), the water diversion tunnel (2) being provided with a first hole and a second hole, the first hole being in communication with a first accommodation space (101), the second hole being in communication with a second accommodation space (301), the height of the first hole being higher than the height of the second hole; A hydroelectric generator set (202) is arranged in the water diversion tunnel (2).

2. The pumped storage system based on offshore wind power monopile group according to claim 1 is characterized in that: The water diversion tunnel (2) is arranged at an angle, and a first gate (201) is arranged in the water diversion tunnel (2).

3. The pumped storage system based on offshore wind power monopile group according to claim 2 is characterized in that: A water inlet (104) and an operation and maintenance water outlet (106) are provided on the side wall of the water inlet single pile (1); the water inlet (104) is lower than the sea level (5); the height of the operation and maintenance water outlet (106) is higher than the height of the sea level (5); each of the water inlets (104) is provided with a water inlet valve; the operation and maintenance water outlet (106) is provided with a drain valve; the water inlets (104) are connected to a water inlet pipe; and the operation and maintenance water outlet (106) is connected to an operation and maintenance drain pipe (108).

4. The pumped storage system based on offshore wind power monopile group according to claim 3 is characterized in that: The water storage single pile (3) is provided with a drainage pump (305) and a drainage pipe (306); the drainage pipe (306) is provided with a drainage outlet (307); the drainage outlet (307) is provided with a drainage valve; the drainage outlet (307) is higher than the sea level (5); and the water suction port of the drainage pipe (306) is provided at the bottom of the second accommodating space (301).

5. The pumped storage system based on offshore wind power monopile group according to claim 4 is characterized in that: The bottom of the second accommodating space (301) of the water storage single pile (3) is provided with a bottom seal (303) or an underground cavern (304), and the bottom of the first accommodating space (101) is provided with a bottom seal (303).

6. The pumped storage system based on offshore wind power monopile group according to claim 5 is characterized in that: A first installation platform (103) is provided in the first accommodating space (101); the first installation platform (103) is arranged above the sea surface (5); and a first control box (102) is provided on the first installation platform (103).

7. The pumped storage system based on offshore wind power monopile group according to claim 6 is characterized in that: A second installation platform (302) is provided in the second accommodating space (301), and a drainage pump (305) is provided on the second installation platform (302).

8. The pumped storage system based on offshore wind power monopile group according to claim 1 is characterized in that: A water storage tunnel (4) is provided between adjacent water storage piles (3), a hydro-generator set (202) is provided in the water storage tunnel (4), and a second gate is provided in the water storage tunnel (4).

9. The pumped storage system based on offshore wind power monopile group according to claim 1 is characterized in that: A power generation component or an energy storage component is provided on the top of the water inlet monopile (1) and the water storage monopile (3), and the power generation component or the energy storage component is connected to the substation.

10. A method for using a pumped storage system based on an offshore wind power monopile group, used for using the pumped storage system based on an offshore wind power monopile group according to claim 1, characterized in that: Normally, seawater is introduced into the first accommodating space (101); when the power grid needs to generate electricity, the first accommodating space (101) is connected to the outside of the water inlet pile (1), and the seawater outside the water inlet pile (1) and the seawater in the first accommodating space (101) enter through the first opening of the water diversion tunnel (2), impact the hydro-generator set (202) to generate electricity, and reach the second opening to enter the second accommodating space (301).

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