Offshore wind power miniature energy storage device for storing energy through underwater compressed air

Abstract

The utility model relates to an offshore wind power miniature energy storage device for storing energy through underwater compressed air, and aims to solve the problems that offshore wind power is unstable and electric energy is difficult to store and improve the stability of electric power transmission of an offshore wind power unit. The front end of the device is connected with an air compressor, power is supplied to the air compressor and an air bag in an energy storage device is inflated when the generating capacity of an offshore wind turbine generator is sufficient, an electronic one-way valve of compressed air energy storage equipment is opened when wind energy is weak, the air bag is compressed by water pressure to release compressed air, and potential energy of the compressed air is converted into mechanical energy through an expansion machine; and then the generator is driven to generate electricity and transmit electric energy to a power grid. By adopting the device, the fluctuation of offshore wind power can be effectively stabilized, the grid connection performance of the wind power and the stability of power transmission are improved, powerful technical support is provided for large-scale development and utilization of the offshore wind power, and the device has a wide application prospect.

Description

Technical Field

[0001] This utility model patent relates to the field of offshore wind power energy storage, and in particular to an underwater compressed air energy storage micro-energy storage device for offshore wind power. Background Technology

[0002] With the increasing global demand for clean energy, offshore wind power, as a renewable energy source with enormous potential, has received widespread attention and rapid development. However, offshore wind power suffers from intermittency and instability; its power generation is significantly affected by wind speed variations, making it difficult to directly integrate into the grid for stable power supply. Furthermore, offshore wind farms are typically located far from land, posing numerous challenges to power transmission and storage. Traditional energy storage technologies, such as battery storage and mechanical storage, suffer from high costs, complex maintenance, and poor environmental adaptability in offshore wind power scenarios.

[0003] Offshore wind power, as an important component of renewable energy, has experienced rapid development in recent years. However, its development has also encountered some challenges and problems:

[0004] High cost: Offshore wind power is more expensive to build and maintain than onshore wind power. This is mainly because it requires more complex infrastructure to withstand the effects of the marine environment, such as stronger winds, waves, and salt spray corrosion.

[0005] Technical challenges in basic structural design: To cope with the harsh conditions at sea, the foundation structure of wind turbines needs to be specially designed to ensure stability and durability.

[0006] Installation difficulty: The complex offshore operating environment places higher demands on equipment installation, including special transportation tools and installation techniques.

[0007] Remote monitoring and maintenance: Offshore wind farms are usually located far from the coast, which poses challenges to the reliability of remote monitoring systems and the convenience of maintenance.

[0008] The instability of offshore wind power generation mainly stems from the unpredictability of natural conditions and technological limitations. Specifically, the following are the main reasons for the instability of offshore wind power generation:

[0009] Wind speed variations: Wind speed and direction in the marine environment fluctuate significantly over time and have a degree of randomness. Even in sea areas rich in wind energy resources, situations such as excessively low or high wind speeds and sudden changes in wind direction can occur, which directly affect the efficiency of wind turbines in capturing wind energy.

[0010] Weather and seasonal influences: Different seasons and short-term weather systems such as storms and low-pressure areas can cause significant changes in wind conditions at sea. For example, in some cases, extreme weather may force wind turbines to shut down to avoid damage, thus interrupting power production.

[0011] Technical limitations: Despite increasingly advanced designs, modern offshore wind turbines may still have performance limitations when facing extreme weather conditions. For example, when wind speeds exceed the design range, the turbine may need to automatically shut down or operate at reduced power to protect the equipment from damage.

[0012] Maintenance and Faults: Offshore wind farms are typically located far from the coast, which increases the difficulty and cost of maintenance. In the event of a fault, it takes a long time for maintenance personnel to reach the site and fix the problem, which may also lead to a temporary decrease in power generation capacity.

[0013] Grid connection issues: Effectively transmitting electricity generated by offshore wind power to the onshore power grid is also a challenge. Losses may occur during long-distance submarine cable transmission, and if the grid infrastructure is not robust enough, it may not be able to fully absorb all the power output from offshore wind farms.

[0014] These issues demonstrate the enormous potential of offshore wind power, but its inherent intermittency and uncertainty necessitate the development of more advanced energy storage technologies and more flexible grid management systems to balance supply and demand, ensuring the stability and reliability of power supply. Furthermore, continuous technological innovation is also a key factor in improving the stability of offshore wind power. In conclusion, developing an efficient, economical, and reliable energy storage device suitable for offshore wind power is of great significance. Utility Model Content

[0015] This invention aims to solve the problems of unstable offshore wind power and difficulty in storing electrical energy, and to improve the stability of power transmission from offshore wind turbines under unfavorable wind conditions. It also aims to address the problems of unstable power transmission and difficulty in storing electrical energy caused by unstable wind energy during the power generation process of offshore wind turbines. The invention designs a micro-energy storage device for offshore wind power using underwater compressed air storage. This method can improve the stability of power transmission from offshore wind turbines and is of great significance for the storage and transmission of electrical energy in offshore wind farms.

[0016] To solve the problems mentioned above, this utility model is achieved through the following technical solution:

[0017] A micro energy storage device for offshore wind power with underwater compressed air energy storage includes an outer shell. The outer sides of the opposite side walls of the outer shell are fixedly connected to a fixing plate by multiple screws. The fixing plate is fixedly connected to the base of a push-pull device. The bottom side wall of the outer shell is also provided with multiple interfaces, and each interface is fixedly installed with an airbag.

[0018] The output end of the push-pull device is fixedly connected to a push-pull rod, and the bottom end of the push-pull rod is fixedly connected to a cover plate. The outer wall of the cover plate is in close sliding contact with the inner wall of the outer shell.

[0019] Multiple fixing rods are also fixedly installed on the two symmetrical side walls of the outer shell. The fixing rods are used to reduce the vibration of the side walls of the outer shell when the push-pull device is stretched up and down, and to maintain the sealing between the cover plate and the outer shell.

[0020] The bottom of the four sides of the outer casing is also provided with multiple windows, which are used to observe whether there is any air leakage at the bottom of the outer casing.

[0021] Each airbag is provided with a dome-shaped tray on top, and the dome-shaped tray on top of each airbag is located below the cover plate.

[0022] Each airbag is fixedly connected to a round-bottomed tray at its bottom, and each round-bottomed tray is fixedly connected to an air inlet pipe and an air outlet pipe.

[0023] Each of the round-bottomed trays has a fixed air inlet pipe connected to a one-way air inlet valve.

[0024] Each of the circular bottom trays has a fixed air outlet pipe connected to a one-way air outlet valve.

[0025] The air inlet pipe of each of the circular bottom trays is connected in parallel to the air outlet pipe of the compressor, and the air inlet pipe of the compressor is connected to the atmosphere.

[0026] The exhaust pipe of each of the circular bottom trays is connected in parallel to the intake pipe of the expander, the exhaust pipe of the expander is connected to the atmosphere, and the output shaft of the expander is connected to the generator.

[0027] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0028] 1. This utility model, through a reasonable compartmentalized design with multiple air storage bladders, can store a large amount of compressed air. At the same time, the micro air storage device can be flexibly deployed in large quantities to meet the needs of large-scale energy storage for offshore wind power.

[0029] 2. This utility model can dynamically control the compressed air capacity of the gas storage equipment through a one-way outlet valve, a one-way inlet valve, a cover plate and a push-pull device. It can effectively smooth out the fluctuations of offshore wind power, reduce the impact of the randomness and uncertainty of wind power output on the power grid, improve the grid's acceptance capacity and operational stability, and promote the large-scale grid connection of offshore wind power.

[0030] 3. This utility model relies on the water pressure at the bottom of the sea to discharge compressed air from the airbag, reducing the power consumption when the airbag is venting and improving energy utilization efficiency. The one-way air outlet valve, one-way air inlet valve, cover plate and push-pull device of the airbag can control the amount of compressed air stored, and at the same time can control the amount of compressed air received by the expander. Attached Figure Description

[0031] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0032] Figure 1 This is a schematic diagram of the main structure of the offshore wind power micro energy storage device for underwater compressed air energy storage according to this utility model.

[0033] Figure 2 This is a schematic diagram of the bottom structure of the device of this utility model.

[0034] Figure 3 This is a schematic diagram of the outer shell of this utility model after the airbag is removed.

[0035] Figure 4 This is a schematic diagram of the cover plate and airbag of this utility model.

[0036] Figure 5 This is a schematic diagram of the structure of the airbag of this utility model.

[0037] Figure 6 This is a top view of the offshore wind power micro energy storage device of this utility model after the cover plate has been removed.

[0038] Figure 7 This is a left view of the micro energy storage device for offshore wind power according to this utility model.

[0039] Reference numerals: 1. Outer shell, 101. Window, 102. Interface, 2. Fixing plate, 3. Push-pull device, 4. Push-pull rod, 5. Fixing rod, 6. Cover plate, 7. Screw, 8. Airbag, 9. One-way air outlet valve, 10. One-way air inlet valve, 11. Dome tray, 12. Bottom tray.

[0040] Preferably, the controller, compressor, and expander are powered by an external power source.

[0041] Preferably, the push-pull device 3 is purchased from ABB Switzerland, model: FlexTrack IRT 501, along with its associated power supply and circuitry; the push-pull device 3 comes with a push-pull rod 4.

[0042] Preferably, the compressor is purchased from Shanghai Ingersoll Rand Compressor Co., Ltd., model: Ingersoll Rand R screw compressor, along with its related power supply and circuit.

[0043] Preferably, the expander is purchased from Atlas Copco, model: Atlas Copco TCF centrifugal expander, along with its associated power supply and circuitry.

[0044] Preferably, the one-way exhaust valve 9 is purchased from Fujian Lingrui Automation Technology Co., Ltd., model: SMC one-way valve AKH08A-02S and its related power supply and circuit.

[0045] Preferably, the one-way air inlet valve 10 is purchased from MISUMI Precision Machinery Trading Co., Ltd., model: MISUMI C / CF universal one-way valve, along with its related power supply and circuit.

[0046] Preferably, the generator is a wind turbine purchased from Vestas Wind Systems AS, model: V164-9.5MW, along with its associated power supply and circuitry.

[0047] Preferably, the pipes connecting the compressed air are made of corrosion-resistant materials, such as 316L stainless steel.

[0048] Preferably, the airbag 8 is made of high-pressure resistant composite material, purchased from Hengshui Meide Rubber & Plastic Co., Ltd., model PVC air nozzle capsule.

[0049] Preferably, the controller is purchased from Siemens AG SIMATIC S7-400H model and its related power supply and circuit.

[0050] Push-pull device 3, one-way exhaust valve 9, one-way intake valve 10, and the control terminals of compressor, expander and generator are electrically connected to the signal output terminal of controller respectively;

[0051] The controller controls the push-pull device 3, the one-way exhaust valve 9, the one-way intake valve 10, the compressor, the expander, and the generator; it is used to start or stop these components. This application does not improve the power supply circuit of the above electronic components; they can be operated and used directly using conventional methods.

[0052] The methods for controlling and operating these instruments are common knowledge to those skilled in the art, and will not be specifically described in this invention. Any aspects not described in detail in this application are prior art and will not be described in detail therein. This application only describes the improvements to the device. Detailed Implementation

[0053] It should be understood that the terms "sidewall," "outer side," "bottom," "inner sidewall," and "top," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used solely for the convenience of describing the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Unless otherwise specified, the fixed connections described in this application are achieved using conventional methods, such as bonding and welding.

[0054] The selection of model numbers for the materials or instruments in this patent is merely for illustrative purposes and is not intended to restrict the use of specific instrument models.

[0055] Example 1

[0056] like Figures 1-7As shown, an underwater compressed air energy storage device for offshore wind power includes an outer shell 1. The outer sides of the opposite side walls of the outer shell 1 are fixedly connected to a fixing plate 2 by multiple screws 7. The fixing plate 2 is fixedly connected to the base of a push-pull device 3. The bottom side wall of the outer shell 1 is also provided with multiple interfaces 102, and each interface 102 is fixedly installed with an airbag 8.

[0057] The push-pull device 3 is fixedly connected to the push-pull rod 4 at its output end, and the bottom end of the push-pull rod 4 is fixedly connected to the cover plate 6. The outer wall of the cover plate 6 is in sliding contact with the inner wall of the outer shell 1.

[0058] Multiple fixing rods 5 are also fixedly installed on the symmetrical side walls of the outer casing 1. The fixing rods 5 are used to reduce the vibration of the side walls of the outer casing 1 when the push-pull device 3 is stretched up and down, and to maintain the sealing between the cover plate 6 and the outer casing 1.

[0059] The bottom of the four sides of the outer casing 1 is also provided with multiple windows 101, which are used to observe whether the bottom of the outer casing 1 is leaking air.

[0060] Each airbag 8 has a dome-shaped tray 11 on top, and the dome-shaped tray on top of each airbag 8 is located below the cover plate 6.

[0061] Each airbag 8 is fixedly connected to a round bottom tray 12 at its bottom, and each round bottom tray 12 is fixedly connected to an air inlet pipe and an air outlet pipe.

[0062] Each round-bottomed tray 12 has a fixed air inlet pipe connected to a one-way air inlet valve 10.

[0063] Each round-bottomed tray 12 has a fixed air outlet pipe connected to a one-way air outlet valve 9.

[0064] The air inlet pipe of each round-bottomed tray 12 is connected in parallel to the air outlet pipe of the compressor, and the air inlet pipe of the compressor is connected to the atmosphere.

[0065] The exhaust pipe of each round-bottomed tray 12 is connected in parallel to the intake pipe of the expander, the exhaust pipe of the expander is connected to the atmosphere, and the output shaft of the expander is connected to the generator.

[0066] The airbag 8 can be compressed by the pressure at the bottom of the water, delivering the compressed gas to the expander; the bottom of the airbag 8 is equipped with a one-way exhaust valve 9 and a one-way inlet valve 10. The upper cover plate 6, which withstands water pressure, the push-pull device 3, the one-way exhaust valve 9, and the one-way inlet valve 10 control the compression of the airbag 8. The compressor compresses the air to a high-pressure state.

[0067] The gas is stored in four airbags made of high-pressure resistant composite materials.

[0068] Preferably, multiple support frames are fixedly installed on hard seabed rocks, and the bottom of the outer shell 1 is fixedly welded to several support frames, thereby fixing the outer shell 1 of the underwater compressed air energy storage offshore wind power micro energy storage device to the seabed.

[0069] The airbag 8 has good sealing and corrosion resistance, can withstand the pressure of high-pressure air, and can safely and stably store a large amount of compressed air. The one-way inlet valve 10 controls the one-way flow of compressed air into the airbag 8, and the one-way outlet valve 9 controls the one-way flow of compressed air out of the airbag 8. The upper push-pull device 3 can control the position of the cover plate 6. When the airbag 8 needs to release compressed air, the upper cover plate 6 is compressed by water pressure, and the compressed air in the airbag 8 is released through the push-pull device 3 and the electronic one-way outlet valve 9, which improves the flexibility and reliability of the airbag 8.

[0070] The airbag 8 in the energy storage device is installed at a depth of about 30-35m underwater.

[0071] The operating principle of the device is as follows:

[0072] The expander corresponds to the compressor. When it is necessary to release stored energy, the high-pressure compressed air in the air bladder 8 of the device enters the expander, and the potential energy of the compressed air is converted into mechanical energy through expansion. The output shaft of the expander is connected to the generator, which drives the generator to generate electricity, converting mechanical energy into electrical energy and transmitting it to the power grid.

[0073] The above embodiments are merely preferred technical solutions of this utility model and should not be considered as limitations on this utility model. The protection scope of this utility model should be the technical solution described in the claims, including equivalent substitutions of the technical features described in the claims. That is, equivalent substitutions and improvements within this scope are also within the protection scope of this utility model.

Claims

1. A micro-energy storage device for offshore wind power using underwater compressed air energy storage, comprising a shell (1), characterized in that, The outer sides of the opposite side walls of the outer shell (1) are fixedly connected to the fixing plate (2) by multiple screws (7). The fixing plate (2) is fixedly connected to the base of the push-pull device (3). The bottom side wall of the outer shell (1) is also provided with multiple interfaces (102), and each interface (102) is fixedly installed with an airbag (8).

2. The micro-energy storage device for offshore wind power with underwater compressed air energy storage according to claim 1, characterized in that, The push-pull device (3) is fixedly connected to the push-pull rod (4) at its output end, and the bottom end of the push-pull rod (4) is fixedly connected to the cover plate (6). The outer wall of the cover plate (6) is in sliding contact with the inner wall of the outer shell (1).

3. The micro-energy storage device for offshore wind power with underwater compressed air energy storage according to claim 1, characterized in that, Multiple fixing rods (5) are also fixedly installed on the two symmetrical side walls of the outer shell (1). The fixing rods (5) are used to reduce the shaking of the side wall of the outer shell (1) when the push-pull device (3) is stretched up and down, and to maintain the sealing between the cover plate (6) and the outer shell (1).

4. The micro-energy storage device for offshore wind power with underwater compressed air energy storage according to claim 1, characterized in that, The bottom of the four sides of the outer shell (1) is also provided with multiple windows (101), which are used to observe whether the bottom of the outer shell (1) is leaking air.

5. A micro-energy storage device for offshore wind power with underwater compressed air energy storage according to claim 1, characterized in that, Each of the airbags (8) is provided with a dome tray (11) on top, and the dome tray on top of each airbag (8) is located below the cover plate (6).

6. A micro-energy storage device for offshore wind power with underwater compressed air energy storage according to claim 1, characterized in that, Each airbag (8) is fixedly connected to a round bottom tray (12) at its bottom, and each round bottom tray (12) is fixedly connected to an air inlet pipe and an air outlet pipe.

7. A micro-energy storage device for offshore wind power with underwater compressed air energy storage according to claim 6, characterized in that, Each of the round-bottomed trays (12) has an air inlet pipe that is fixedly connected to a one-way air inlet valve (10).

8. A micro-energy storage device for offshore wind power with underwater compressed air energy storage according to claim 6, characterized in that, Each of the round-bottomed trays (12) has a fixed air outlet pipe connected to a one-way air outlet valve (9).

9. A micro-energy storage device for offshore wind power with underwater compressed air energy storage according to claim 6, characterized in that, The air inlet pipe of each of the circular bottom trays (12) is connected in parallel to the air outlet pipe of the compressor, and the air inlet pipe of the compressor is connected to the atmosphere.

10. A micro-energy storage device for offshore wind power with underwater compressed air energy storage according to claim 6, characterized in that, The exhaust pipe of each of the circular bottom trays (12) is connected in parallel to the intake pipe of the expander, the exhaust pipe of the expander is connected to the atmosphere, and the output shaft of the expander is connected to the generator.

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