A compressed gas energy storage device based on marine new energy power system

Abstract

The present invention discloses a compressed gas energy storage device based on a marine new energy power system, which includes a frame structure unit, a pressure-bearing variable volume unit, a drainage unit, a suspended platform unit, a compressor unit, and a turbine generator unit. This device is used for the energy storage part of the marine energy and new energy power system in the marine environment. It uses the approximate "constant temperature and constant pressure" characteristics of the middle and deep seawater to store the high-pressure gas energy storage device in the middle and deep sea. It participates in the regulation of the marine regional power grid to ensure the safety and stability of the power grid in the marine and island environments. The present invention is safe, reliable, and highly practical, and has good economic benefits and promotion value.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a compressed gas energy storage device based on a marine new energy power system. Background Art

[0002] In the current marine new energy environment, the power grid architecture mainly relies on submarine cables to transport marine new energy to land for storage, regulation and consumption. Therefore, the built submarine cable system is too single and large in scale. In addition, the industry currently regards "pumped storage and compressed gas energy storage as the first choice for large-scale development of energy storage technology." However, these two types of technologies require special site selection conditions. Pumped storage requires a certain potential difference, and compressed gas energy storage requires a huge high-pressure gas storage reservoir. At present, these two large-capacity energy storage technologies cannot be implemented in the marine environment. Therefore, it is urgent to develop large-capacity energy storage technologies in the marine new energy environment. Summary of the invention

[0003] The purpose of the present invention is to provide a compressed gas energy storage device based on the marine new energy power system in view of the current situation that large-capacity energy storage technology cannot be implemented in the marine new energy environment. It fully combines the physical characteristics of the ocean, utilizes the temperature and pressure of the middle and deep seawater, and stores high-pressure gas locally in the middle and deep sea areas. While participating in the regulation of the marine regional power grid and ensuring the safety and stability of the power grid in the marine and island environments, it reduces the pressure of site selection and land use for the construction of large-capacity energy storage on land after the marine new energy is transported to land. To this end, the present invention adopts the following technical solutions:

[0004] A compressed gas energy storage device based on a marine new energy power system, characterized in that the device comprises a frame structure unit, a pressure-bearing variable volume unit, a drainage unit, a suspended platform unit, a compressor unit, and a turbine generator unit;

[0005] The frame structure unit is fixed in the middle and deep ocean, the pressure-bearing variable volume unit is arranged in the frame structure unit, and the frame structure unit is provided with a seawater circulation and heat exchange channel;

[0006] The pressure-bearing variable volume unit includes multiple groups of variable volume cavities and a variable volume driving device. The variable volume cavities realize the storage change of the storage medium by deformation. The frame unit is provided with multiple parallel variable volume cavity deformation guide channels. The multiple groups of variable volume cavities are respectively arranged in their respective variable volume cavity deformation guide channels. The seawater circulation heat exchange channel is arranged in the wall of the variable volume cavity deformation guide channel. The end of the variable volume cavity is connected to the compression device.

[0007] The suspension platform unit includes a suspension platform and a plurality of gas storage and balancing airbags. A compressor unit and a turbine generator unit are arranged on the suspension platform. The drainage unit connects the gas outlet of the compressor with the variable volume cavity and the gas inlet of the turbine generator with the variable volume cavity through a high-pressure gas transmission pipeline. The gas inlet of the compressor and the gas storage and balancing airbag and the gas outlet of the turbine generator and the gas storage and balancing airbag are connected through the gas transmission pipeline, or the gas inlet of the compressor and the gas outlet of the turbine generator are connected to the atmosphere.

[0008] The power supply for the compressor in the energy storage system does not pass through the power grid but directly comes from the new energy power in the marine environment or / and the valley power from the regional power grid in the marine environment.

[0009] On the basis of adopting the above technical solutions, the present invention may also adopt the following further technical solutions, or use these further technical solutions in combination:

[0010] Filters are arranged at the inlet and outlet ends of the seawater circulation heat exchange flow channel, and a diversion acceleration structure is arranged at the port close to the flow channel, which can accelerate the seawater to impact the filter and pass through the seawater heat exchange flow channel.

[0011] The frame structure unit is provided with a plurality of guide channel walls to form variable volume cavity deformation guide channels adapted to the number of variable volume cavities.

[0012] The pressure-bearing variable volume unit is composed of multiple groups of variable volume cavities connected in parallel, and a single group of variable volume cavities is composed of one or more variable volume cavities; limit sliders are arranged on both sides of the variable volume cavity, and the guide channel wall is provided with guide rails that slide with the limit sliders. When the variable volume cavity is deformed, the limit slider slides along the direction of the guide rail.

[0013] The compression device adopts a compression piston, which compresses the variable volume cavity inwardly under the drive of ocean energy. The compression piston is slidably connected to the wall of the guide channel, and the frame structure unit is provided with a limiting mechanism of the compression piston.

[0014] The wall of the variable volume cavity adopts a multi-layer design, the middle layer adopts a pressure-bearing structural member, and the inner layer and the outer layer are both made of heat-conducting and corrosion-resistant plastics.

[0015] The variable volume cavity is an accordion-type folded airbag, which can only be expanded and compressed along the deformation guide channel of the variable volume cavity.

[0016] The high-pressure gas transmission pipeline of the drainage unit includes a high-pressure gas transmission trunk line and high-pressure gas transmission branches respectively connected to the gas transmission trunk lines. An interface connected to the branch lines is provided in the middle of the top of the variable-volume cavity; one or both ends of the variable-volume cavity are connected to the compression device.

[0017] The suspension platform and the frame structure unit are connected by multiple sets of balanced cable structures. The high-pressure gas pipeline of the drainage unit extends along the cable from the interface at the suspension platform to the frame structure, and the gas transmission straight pipe is led to the interface of a single variable volume cavity through the airflow distributor.

[0018] The suspension platform is provided with a support frame ring beam, and a plurality of groups of the air storage balancing air bags are provided around and at the bottom of the support frame ring beam to support the suspension platform.

[0019] The gas storage balancing airbag can store carbon dioxide or air medium; the gas storage balancing airbag contains air replenishing chambers that are isolated from each other and can be squeezed against each other to provide basic reserve buoyancy, and air charging and discharging chambers that participate in energy conversion. The gas storage balancing airbag is inflated or deflated symmetrically around the suspension platform to maintain the balance of the suspension platform while converting energy.

[0020] The high-pressure gas transmission trunk line adopts a casing, which includes an inner layer, an intermediate pressure-bearing layer and an outer layer, and the inner layer and the outer layer are made of heat-conducting and corrosion-resistant plastics.

[0021] The present invention adopts the method of nearby energy storage and transportation, and stores the new energy power in the marine environment or the excess power of the marine environment regional power grid on site, thereby reducing the pressure on the land energy storage system and the huge land use pressure of the land energy storage system after the ocean energy is transported to the land, and ensuring the stability of the new energy power supply and the stability of the power grid in the marine environment. In addition, the nearly constant temperature environment and seawater pressure of the middle and deep seawater, that is, the seawater at a depth of more than 50m, are utilized to reduce the pressure-bearing construction cost of energy storage. In summary, the present invention has the following beneficial technical effects:

[0022] Firstly, the present invention stores the new energy and surplus electricity in the marine environment on-site in seawater at a depth of more than 50m, solving the technical problem that the new energy in the marine environment has poor volatility and is difficult to store on-site, storing energy to the maximum extent and ensuring the stability of the power grid in the marine environment.

[0023] Secondly, the present invention makes full use of the seawater environment at a depth of more than 50m, provides good energy storage and cooling conditions for gas energy storage, and provides a constant pressure for the released energy storage medium, ensuring constant pressure operation of the turbine generator. When the energy storage medium is carbon dioxide, the temperature of the deep ocean environment at a depth of more than 50m can directly liquefy the high-pressure gaseous carbon dioxide, greatly improving the utilization rate and reliability of the equipment energy storage space.

[0024] Third, the present invention adopts deep-sea cooling technology. At the contact points between the drainage unit and the pressure-bearing variable volume unit and the seawater, heat-conducting plastic materials are used to meet the heat conduction and effectively isolate the corrosion of the pressure-bearing materials by seawater.

[0025] Fourthly, the present invention adopts the marine platform floating technology, and flexibly connects the suspension platform unit and the frame structure unit through the air storage balance airbag and the balance cable structure, so as to realize the floating and positioning of the suspension platform unit.

[0026] Fifth, the pressure-bearing variable volume unit is arranged in the middle and deep ocean, and relies on the liquid level pressure of the ocean to provide an energy storage environment, thereby optimizing the space occupied by the energy storage device on land. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a system schematic diagram of a compressed gas energy storage device based on a marine new energy power system of the present invention.

[0028] Figure 2 It is a structural top view of the frame structure unit and the pressure-bearing variable volume unit of the present invention in the energy storage stage.

[0029] Figure 3 It is a top view of the structure of the frame structure unit and the pressure-bearing variable volume unit of the present invention in the energy release stage.

[0030] Figure 4 and Figure 5 They are Figure 2 AA section view and Figure 3 BB cross-sectional views, which are schematic longitudinal cross-sectional structures of the pressure-bearing variable volume unit of the present invention in the energy storage stage and the energy release stage respectively.

[0031] Figure 6 It is an enlarged view of the cooperation between the limit sliding block and the limit guide rail in the embodiment of the present invention.

[0032] Figure 7 It is a top view of the square columnar cavity in the expanded state according to an embodiment of the present invention.

[0033] Figure 8 It is a top view of the square columnar cavity in a compressed state according to an embodiment of the present invention.

[0034] Fig. 9 It is a front view of the square columnar cavity in the deformation guide channel of the variable volume cavity in an embodiment of the present invention.

[0035] Fig.10 It is a cross-sectional view of a high-pressure gas transmission trunk line in an embodiment of the present invention.

[0036] Fig.11 It is a structural schematic diagram of the suspension platform of the present invention. DETAILED DESCRIPTION

[0037] Referring to the accompanying drawings, the present invention provides a compressed gas energy storage system based on a marine new energy power system, comprising a floating platform 101, a compressor unit, a turbine generator unit, a drainage unit, a frame structure unit and a pressure-bearing variable volume unit. The compressor unit and the turbine generator unit are arranged on the floating platform, and the pressure-bearing variable volume unit is embedded in the frame structure unit and immersed in a medium-deep marine environment at a depth of more than 50m.

[0038] The suspended platform 101 is provided with an air storage and balancing airbag 102, an air storage and balancing airbag inlet and exhaust pipeline 10, and an air storage and balancing airbag air replenishment chamber pipeline 11. The air storage and balancing airbag 102 includes an air intake and exhaust chamber 1021 and an air replenishment chamber 1022 separated from each other, and the air replenishment chamber is used to provide basic buoyancy. The air storage and balancing airbag inlet and exhaust pipeline 10 is connected with the air intake and exhaust chamber of the air storage and balancing airbag 102, the normal pressure energy storage gas inlet pipeline 21, and the turbine normal pressure energy storage gas exhaust pipeline 32. The air storage and balancing airbag inlet and exhaust pipeline 10 is provided with an air supply valve 103, a safety valve 107, and an air intake and exhaust valve 108. The air storage and balancing airbag air replenishment chamber pipeline 11 is connected with an air replenishment compressor 104 and the air replenishment chamber of the air storage and balancing airbag 102. The air replenishment chamber pipeline 11 is provided with an air replenishment chamber inlet valve 105 and an air replenishment chamber deflation valve 106.

[0039] The compressor unit is provided with a normal pressure energy storage gas inlet pipeline 21 and a high pressure energy storage gas outlet pipeline 22, and the normal pressure energy storage gas inlet pipeline 21 is connected to the compressor 201 inlet and the gas storage balance airbag inlet and exhaust pipeline 10. An inlet electric butterfly valve 202, an electric quick closing valve 203 and a filter 204 are provided on the normal pressure energy storage gas inlet pipeline 21. A check valve 205 and an electric butterfly valve 206 are provided on the high pressure energy storage gas outlet pipeline 22. The high pressure energy storage gas outlet pipeline 22 is connected to the high pressure gas transmission pipeline 41 of the drainage unit as the high pressure gas outlet of the compressor 201.

[0040] The turbine generator unit is provided with a turbine high-pressure energy storage gas intake pipeline 31 and a turbine normal-pressure energy storage gas exhaust pipeline 32. The turbine high-pressure energy storage gas intake pipeline 31 is connected to the high-pressure gas transmission pipeline 41 of the drainage unit as the high-pressure gas inlet of the turbine generator 301. The turbine high-pressure energy storage gas intake pipeline 31 is provided with an inlet electric butterfly valve 302, an electric quick-closing valve 303 and a filter 304. The turbine normal-pressure energy storage gas exhaust pipeline 32 is provided with a check valve 305 and an electric butterfly valve 306. The turbine normal-pressure energy storage gas exhaust pipeline 32 is connected to the outlet of the turbine generator 301, the balance airbag intake and exhaust pipeline 10 and the normal-pressure energy storage gas intake pipeline 21.

[0041] The drainage unit includes a high-pressure gas transmission pipeline 41 as a trunk and high-pressure gas transmission pipelines 42 as branches respectively connected to each variable volume cavity. The high-pressure gas transmission pipeline 41 is connected to the turbine high-pressure energy storage gas inlet pipeline 31 and the high-pressure energy storage gas outlet pipeline 22. The high-pressure gas transmission pipeline 41 is provided with an electric butterfly valve 401, an electric quick-closing valve 402, and a filter 403.

[0042] The drainage unit is provided with an airflow distributor 404. The lower end of the high-pressure gas delivery pipeline 41 and the airflow distributor 404 located on the frame structure are connected. The high-pressure gas delivery pipeline 42 is connected with the airflow distributor 404 and the interface 604 of the variable volume cavity.

[0043] The frame structure unit includes a plurality of limit frames 501 arranged along the height direction, a seawater circulation heat exchange flow channel 502, a filter screen 503, a variable diameter section 504 in the cooling flow channel, a limit guide rail 505, a variable volume cavity deformation guide channel wall 506 and a limit balance cable 507. The plurality of limit frames 501 are used to fix the variable volume cavity deformation guide channel wall 506, and the variable volume cavity deformation guide channel wall 506 is arranged in the limit frame. The limit guide rail 505 is arranged on the variable volume cavity deformation guide channel wall 506, the seawater circulation heat exchange flow channel 502 is arranged in the variable volume cavity deformation guide channel wall 506, and the adjacent variable volume cavity deformation guide channel walls 506 constitute the variable volume cavity deformation guide channel. Filter screens are arranged at the inlet and outlet ends of the seawater circulation heat exchange flow channel, and a variable diameter section 504 is arranged near the flow channel port of the seawater circulation heat exchange flow channel 502 as a drainage acceleration structure to accelerate the seawater to impact the filter screen.

[0044] The pressure-bearing variable volume unit includes a compression piston 601, a plurality of variable volume chambers 602 and a limit slider 603. The compression piston 601 is used to compress the variable volume chamber 602 inwardly under the drive of ocean energy. A drainage port 604 is provided in the middle of the top of the variable volume chamber 602. The side of the variable volume chamber 602 is provided with the limit slider 603 that cooperates with the limit guide rail 505. The compression piston can be slidably matched with the limit guide rail 501. A limit structure 508 for the compression piston 601 is also provided on the frame structure unit, such as the limit frame 501, to prevent the compression piston 601 from slipping out of the deformation guide channel of the variable volume chamber.

[0045] The compression piston 601 preferably has a trapezoidal cross-section structure, wherein the short side end squeezes a single variable volume cavity 602 and the long side end transmits the ocean energy pressure.

[0046] The frame structure unit is fixed on the deep seabed at a depth of more than 50m. Multiple variable volume cavities 602 are arranged in parallel in the frame structure unit. Cooling channels 502 are arranged in the variable volume cavity deformation guide channel walls 506 on both sides of the variable volume cavity. The ocean current enters the seawater circulation heat exchange channel 502 through the channel filter 503, exchanges heat with the variable volume cavity 602, and then impacts the filter 503 at the flow channel outflow port after being accelerated by the variable diameter section 504 to remove the attachments on the filter 503.

[0047] The variable volume cavity 602 is compressed by the external ocean current and expanded by the internal storage medium, and the variable volume is achieved through deformation. The matching part of the limit slider 603 and the limit guide rail can adopt a "T" structure, and the limit guide rail 505 can adopt a slot matching the "T" structure. The limit slider 603 can be slidably stuck in the limit guide rail, which can prevent the limit slider 603 from escaping from the limit guide rail 505 when the variable volume cavity changes volume.

[0048] The variable volume cavity 602 is an accordion-type folding airbag, which can only expand and compress along the variable volume cavity deformation guide channel. For this purpose, the variable volume cavity 602 can be formed by connecting a plurality of cylindrical cavities 6020. The width of each cylindrical cavity 6020 is consistent with the width of the variable volume cavity deformation guide channel, and the length is determined by the cooperation of the limit slider 603 and the limit guide rail 505. The cylindrical cavity 6020 is foldable in the length direction, for example, there is a soft part in the middle of the length direction along the height direction so that it can be folded. Further, in order to prevent a single cylindrical cavity 6020 from being over-compressed and causing structural damage, the limit slider 603 can be set at the four corners of the cylindrical cavity 6020, and the limit slider 603 can be L-shaped relative to the cylindrical cavity 6020. When two limit sliders 603 on one side are in contact, it is the maximum pressure-bearing state of the cylindrical cavity 6020, which offsets the ocean energy pressure transmitted by the compression piston 601.

[0049] When storing energy, the variable volume cavity 602 is continuously filled with energy storage medium, causing the volume to expand. At this time, the compression piston 601 slides along the limiting guide rail 505 to the outside of the frame structure unit until the compression piston 601 contacts the limiting structure 508, and the compressor 201 stops working. A sensor can be set on the limiting structure 508 to control the compressor; when releasing energy, the compression piston 601 transmits ocean energy pressure, which can provide an approximately constant pressure for the energy storage medium released by the variable volume cavity 602 until all the limiting sliders 603 contact each other.

[0050] The suspension platform unit adopts a suspension platform 101 and a suspension platform ring beam 109 support structure. Multiple groups of air storage balancing airbags 102 are arranged around and at the bottom of the suspension platform ring beam 109 to support the suspension platform unit 1. The suspension platform 101 does not contact the sea surface and floats on the sea surface relying on the suspension platform ring beam 109 and the balancing airbags 102.

[0051] The suspension platform 101 is connected to the frame structure unit 5 by multiple sets of balance cables 507. The high-pressure gas pipeline 41 in the drainage unit is led from the suspension platform 101 to the top of the frame structure along the balance cables 507. The airflow distributor 404 is arranged at the top of the frame structure. The energy storage medium passes through the airflow distributor 404 and is connected to the interface 604 of the variable volume cavity 602 through the high-pressure gas pipeline 42. Both the high-pressure gas pipeline 41 and the high-pressure gas pipeline 42 adopt a flexible pressure-bearing design and can slide with the fluctuation of the ocean current and the storage and release of energy of the variable volume cavity 602.

[0052] The high-pressure gas transmission pipeline 41 adopts a casing, which includes an inner layer 411, an intermediate pressure-bearing layer 412 and an outer layer 413. The inner layer 411 and the outer layer 413 are made of heat-conductive and corrosion-resistant plastics.

[0053] The wall of the variable volume cavity 602 also adopts a multi-layer design, with the middle layer adopting a pressure-bearing structural member, and the inner and outer layers both adopting heat-conducting and anti-corrosion plastics.

[0054] This embodiment adopts compressed gas closed cycle energy storage, and its energy storage working condition includes the following process: close the valves on the turbine high pressure energy storage gas inlet pipeline 31 and the turbine normal pressure energy storage gas exhaust pipeline 32 of the turbine generator unit and the air replenishment cavity vent valve 106, open the valves on the gas storage balance airbag inlet and exhaust pipeline 10, the gas storage balance airbag air replenishment cavity pipeline 11, the normal pressure energy storage gas inlet pipeline 21 of the compressor unit, the high pressure energy storage gas outlet pipeline 22 and the high pressure gas transmission pipeline 41. The compressor 201 is driven by marine new energy to compress the energy storage gas, and the compressed high pressure gas is exchanged with seawater through the drainage pipeline 41, and then stored in the variable volume cavity 602 of the pressure variable volume unit at the deep seabed, and the energy storage medium in the variable volume cavity 602 and the external marine environment achieve internal and external pressure balance. At the same time, the air replenishment compressor 104 compresses air to the air replenishment cavity 1022 of the gas storage balance airbag 102 to ensure the gas storage capacity of the balance airbag 102.

[0055] Its power generation operation includes the following process: close the valves on the normal pressure energy storage gas inlet pipeline 21 and the high pressure energy storage gas outlet pipeline 22 of the compressor unit and the air inlet valve 105 of the air filling cavity, open the valves on the balance airbag inlet and exhaust pipeline 10, the turbine high pressure energy storage gas inlet pipeline 31 of the turbine generator unit 3, the turbine normal pressure energy storage gas exhaust pipeline 32 and the high pressure gas transmission pipeline 41 and the air filling cavity exhaust valve 106. The high pressure gas in the variable volume cavity 602 of the pressure-bearing variable volume unit is used to impact the turbine generator 301 to generate electricity, the compression piston 601 transmits the ocean energy pressure, and provides a nearly constant pressure for the high pressure gas medium. The exhaust gas after work is stored in the gas storage balance airbag 102, thereby realizing a closed cycle of energy storage gas charging and discharging. At the same time, the air in the air filling cavity 1022 of the balance airbag 102 is continuously released into the environment.

[0056] The compressed gas closed-cycle energy storage used in the present invention can use special gas energy storage media such as carbon dioxide. At this time, in the deep and medium ocean environment above 50m, the energy storage gas directly cools the hydraulic pressure, and the energy storage capacity of the energy storage device is greatly improved. In addition, the present invention can also use compressed air open energy storage. At this time, the marine new energy drives the compressor 201 to compress the air, and the gas storage balance airbag 102 is only used for the floating of the suspended platform unit 1, and no longer serves as a storage airbag for the energy storage medium.

[0057] The present invention can adjust the number of devices according to the energy storage installed capacity requirements to improve the flexibility of device layout. In addition, the present invention can also stack multiple sets of frame structure units in the middle and deep sea areas according to the energy storage installed capacity requirements.

[0058] Any equivalent changes or modifications made on the basis of this technical solution in accordance with the technical idea proposed by the present invention shall still fall within the scope of protection of the technical solution of the present invention.

[0059] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A compressed gas energy storage device based on a marine new energy power system, characterized in that The device comprises a frame structure unit, a pressure-bearing variable volume unit, a drainage unit, a suspension platform unit, a compressor unit, and a turbine generator unit; The frame structure unit is fixed in the ocean at a depth of more than 50m, the pressure-bearing variable volume unit is arranged in the frame structure unit, and the frame structure unit is provided with a seawater circulation heat exchange channel; The pressure-bearing variable volume unit includes a plurality of variable volume cavities and a variable volume driving device. The variable volume cavities realize the storage change of the storage medium by deformation. The frame structure unit is provided with a plurality of parallel variable volume cavity deformation guide channels. The plurality of variable volume cavities are respectively arranged in their respective variable volume cavity deformation guide channels. The seawater circulation heat exchange channel is arranged in the wall of the variable volume cavity deformation guide channel. The end of the variable volume cavity is connected to the compression device. The suspension platform unit includes a suspension platform and a plurality of gas storage and balancing airbags. A compressor unit and a turbine generator unit are arranged on the suspension platform. The drainage unit connects the gas outlet of the compressor with the variable volume cavity and the gas inlet of the turbine generator with the variable volume cavity through a high-pressure gas transmission pipeline. The gas inlet of the compressor and the gas storage and balancing airbag and the gas outlet of the turbine generator and the gas storage and balancing airbag are connected through the gas transmission pipeline, or the gas inlet of the compressor and the gas outlet of the turbine generator are connected to the atmosphere. The power supply for the compressor in the energy storage device does not pass through the power grid but directly comes from the new energy power in the marine environment or / and the valley power from the regional power grid in the marine environment.

2. A compressed gas energy storage device based on a marine new energy power system as claimed in claim 1, characterized in that: Filters are arranged at the inlet and outlet ends of the seawater circulation heat exchange flow channel, and a diversion acceleration structure is arranged at the port close to the flow channel, which can accelerate the seawater to impact the filter and pass through the seawater heat exchange flow channel.

3. A compressed gas energy storage device based on a marine new energy power system as claimed in claim 1, characterized in that: The frame structure unit is provided with a plurality of guide channel walls to form variable volume cavity deformation guide channels adapted to the number of variable volume cavities.

4. A compressed gas energy storage device based on a marine new energy power system as claimed in claim 1, characterized in that: The pressure-bearing variable volume unit is composed of multiple groups of variable volume cavities connected in parallel, and a single group of variable volume cavities is composed of one or more variable volume cavities; limit sliders are arranged on both sides of the variable volume cavity, and the guide channel wall is provided with guide rails that slide with the limit sliders. When the variable volume cavity is deformed, the limit slider slides along the direction of the guide rail.

5. A compressed gas energy storage device based on a marine new energy power system as claimed in claim 1, characterized in that: The compression device adopts a compression piston, which compresses the variable volume cavity inwardly under the drive of ocean energy. The compression piston is slidably connected to the wall of the guide channel, and the frame structure unit is provided with a limiting mechanism of the compression piston.

6. A compressed gas energy storage device based on a marine new energy power system as claimed in claim 1, characterized in that: The wall of the variable volume cavity adopts a multi-layer design, the middle layer adopts a pressure-bearing structural member, and the inner layer and the outer layer are both made of heat-conducting and corrosion-resistant plastics.

7. A compressed gas energy storage device based on a marine new energy power system as claimed in claim 1, characterized in that: The variable volume cavity is an accordion-type folded airbag, which can only be expanded and compressed along the deformation guide channel of the variable volume cavity.

8. A compressed gas energy storage device based on a marine new energy power system as claimed in claim 1, characterized in that: The high-pressure gas transmission pipeline of the drainage unit includes a high-pressure gas transmission trunk line and high-pressure gas transmission branches respectively connected to the gas transmission trunk lines. An interface connected to the branch lines is provided in the middle of the top of the variable-volume cavity; one or both ends of the variable-volume cavity are connected to the compression device.

9. A compressed gas energy storage device based on a marine new energy power system as claimed in claim 1, characterized in that: The suspension platform and the frame structure unit are connected by multiple sets of balanced cable structures. The high-pressure gas pipeline of the drainage unit extends along the cable from the interface at the suspension platform to the frame structure, and the gas transmission straight pipe is led to the interface of a single variable volume cavity through the airflow distributor.

10. A compressed gas energy storage device based on a marine new energy power system as claimed in claim 1, characterized in that: The suspension platform is provided with a support frame ring beam, and a plurality of groups of the air storage balancing air bags are provided around and at the bottom of the support frame ring beam to support the suspension platform.

11. A compressed gas energy storage device based on a marine new energy power system as claimed in claim 1, characterized in that: The gas storage balancing airbag can store carbon dioxide or air medium; the gas storage balancing airbag contains air replenishing chambers that are isolated from each other and can be squeezed against each other to provide basic reserve buoyancy, and air charging and discharging chambers that participate in energy conversion. The gas storage balancing airbag is inflated or deflated symmetrically around the suspension platform to maintain the balance of the suspension platform while converting energy.

12. A compressed gas energy storage device based on a marine new energy power system as claimed in claim 8, characterized in that: The high-pressure gas transmission trunk line adopts a casing, which includes an inner layer, an intermediate pressure-bearing layer and an outer layer, and the inner layer and the outer layer are made of heat-conducting and corrosion-resistant plastics.

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