Offshore tower type wind photovoltaic power generation system with compressed air energy storage function

Abstract

The invention discloses an offshore tower-type wind power photovoltaic power generation system with compressed air energy storage, which comprises a tower-type platform, a compressed air energy storage device and a wind power generation system, the tower-type platform is provided with a photovoltaic power generation system, a compressor, a turbine and a generator, the wind power generation system comprises a wind turbine generator, the wind turbine generator is installed on the tower-type platform, and the compressed air energy storage device is installed on the wind turbine generator. The compressed air energy storage device comprises a seabed flexible air bag, the seabed flexible air bag is placed below the sea surface, the compressor and the turbine are communicated with the seabed flexible air bag through pipelines, and the generator is connected with the turbine. And the stability of power output is ensured.

Description

Technical Field

[0001] The invention belongs to the technical field of offshore wind power generation equipment and relates to an offshore tower-type wind photovoltaic power generation system with compressed air energy storage. Background Art

[0003] Publication No. CN117811465A discloses a floating photovoltaic compressed air energy storage system, including a floating platform, a photovoltaic module and a compressed air energy storage device, wherein the photovoltaic module is installed on the floating platform; the compressed air energy storage device includes a compressor and a flexible air bag, wherein the compressor is installed on the floating platform and is electrically connected to the power output end of the photovoltaic module, wherein the flexible air bag is arranged at intervals below the floating platform so as to be fixed at a set depth below the sea surface, and the flexible air bag is connected to the compressor through a pipeline. According to the floating photovoltaic compressed air energy storage system of an embodiment of the present invention, the electric energy generated by the photovoltaic module will drive the compressor to input air into the flexible air bag, thereby realizing energy storage, and the energy storage safety is high. In addition, the volume of the flexible air bag can increase with the increase of the volume of the air rushed into it, and combined with the flexible air bag being located at a set height below the sea surface, the pressure of the sea water keeps the air in the flexible air bag in a high-pressure state, that is, the air is automatically compressed, and the energy storage cost of the flexible air bag is low. Moreover, the flexible air bag is arranged under the floating platform, so as not to occupy the space of the floating platform, and the volume of the floating platform does not need to be set larger, thereby further improving the energy storage cost of the floating photovoltaic compressed air energy storage system.

[0004] Publication number CN110360055A discloses a medium and low voltage air energy storage type offshore wind power generation system and its operation method, including a wind turbine, a floating platform, a fixed cable, an air turbine, an air compressor inlet pipeline, an air compressor, an air compressor outlet pipeline, a horizontal pipeline, an underwater pipeline, an airbag, a turbine inlet pipeline, a turbine outlet pipeline, an air compressor outlet pipeline shut-off valve, a turbine inlet pipeline shut-off valve and a fan cable. Among them, the wind turbine is fixed on the floating platform, the floating platform is fixed in a certain sea area through one or several fixed cables, one end of the fan cable is fixed on the floating platform, the air turbine and the air compressor are fixed on the floating platform, the air compressor inlet pipeline and the air compressor outlet pipeline are respectively connected to the inlet and outlet of the air compressor, the air compressor outlet pipeline shut-off valve is located on the air compressor outlet pipeline, the turbine inlet pipeline and the turbine outlet pipeline are respectively connected to the inlet and outlet of the air turbine, the turbine inlet pipeline shut-off valve is located on the turbine inlet pipeline, one end of the air compressor outlet pipeline and one end of the turbine inlet pipeline are both connected to one end of the horizontal pipeline, the other end of the horizontal pipeline is connected to the underwater pipeline, and the underwater pipeline is connected to the airbag fixed underwater. At present, no mature technical solution has been seen to solve the problem of excessive volatility of the grid-connected electric power of offshore wind power. The present invention proposes a medium and low voltage air energy storage type offshore wind power generation system with low cost and high operability. By setting a low-cost air compressor and air turbine with medium and low pressure levels and an underwater air storage airbag on the floating platform of the offshore wind turbine unit, the present invention can store the excess electric energy generated by offshore wind power in compressed air through the air compressor and store it in the underwater air storage airbag. When the electric energy generated by offshore wind power is insufficient or cannot generate electric energy, the compressed air in the underwater air storage airbag is used to drive the air turbine to do work, convert the air compression energy into electric energy, and supply electric energy to the power grid. Through this solution, the offshore wind turbine unit itself has a certain power regulation ability, which can significantly reduce or eliminate the impact on the power grid caused by excessive power fluctuations of existing offshore wind power. The present invention uses a low-cost underwater airbag solution to replace the expensive metal storage tank, reduces the cost and is not restricted by the onshore space, and has the characteristics of long life and high flexibility.

[0005] Due to the inherent intermittency and instability of wind and photovoltaic energy, their grid-connected loads will impact and harm the power grid. Therefore, compressed air energy storage is used for auxiliary power generation, and the excess electric energy during peak power generation is used to drive a compressor to obtain high-pressure air. Utilizing the hydrostatic pressure of deep seawater, the high-pressure air can be stored in an underwater flexible airbag. Compared with traditional compressed air energy storage, underwater high-pressure air energy storage is not restricted by geographical conditions of storage space such as rock caves and mine caves, and there is no need for high-pressure-resistant metal tanks to store high-pressure air, and the cost of its gas storage device will be significantly reduced. Therefore, underwater compressed air energy storage has a natural geographical fit advantage with offshore wind power and has characteristics such as high safety and flexible energy storage scale. Summary of the Invention

[0006] The object of the present invention is to overcome the above-mentioned disadvantages of the prior art and provide an offshore tower-type wind and photovoltaic power generation system with compressed air energy storage. This system uses a compressed air energy storage device for auxiliary power generation to smooth out the peaks and valleys of wind and solar power generation and ensure the stability of power output.

[0007] To achieve the above object, the present invention discloses an offshore tower-type wind and photovoltaic power generation system with compressed air energy storage, including a tower platform, a compressed air energy storage device, and a wind power generation system. A photovoltaic power generation system, a compressor, a turbine, and a generator are provided on the tower platform. The wind power generation system includes a wind turbine unit, and the wind turbine unit is installed on the tower platform. The compressed air energy storage device includes a flexible underwater airbag, and the flexible underwater airbag is placed below the sea surface. The compressor and the turbine are connected to the flexible underwater airbag through pipelines, and the generator is connected to the turbine.

[0008] Further, the photovoltaic power generation system includes photovoltaic panels, a rotating shaft seat, and a photosensitive motor. Among them, the output shaft of the photosensitive motor is connected to the photovoltaic panels through a rotating shaft.

[0009] Further, the photovoltaic power generation system further includes a rotating shaft seat, and the rotating shaft is installed on the rotating shaft seat.

[0010] Further, the rotating shaft seat is installed on the tower platform through bolts.

[0011] Further, the photosensitive element on the photosensitive motor senses the changes in light intensity and angle and adjusts the angle of the photovoltaic panels.

[0012] Further, the photosensitive motor is connected to the power output end of the wind power generation system.

[0013] Further, the compressor is connected to the power output end of the wind power generation system.

[0014] Further, the compressor and the turbine are connected to the flexible underwater airbag through pipelines.

[0015] The present invention discloses an offshore tower-type wind and photovoltaic power generation system with compressed air energy storage, which includes a tower platform, a compressed air energy storage device and a wind power generation system. A photovoltaic power generation system, a compressor, a turbine and a generator are provided on the tower platform. The wind power generation system includes a wind turbine unit, and the wind turbine unit is installed on the tower platform. The compressed air energy storage device includes a flexible undersea airbag, and the flexible undersea airbag is placed below the sea surface. The compressor and the turbine are connected to the flexible undersea airbag through pipelines, and the generator is connected to the turbine;

[0016] The photovoltaic power generation system includes a photovoltaic panel, a rotating shaft seat and a photosensitive motor. Among them, the output shaft of the photosensitive motor is connected to the photovoltaic panel through a rotating shaft;

[0017] The compressor and the turbine are connected to the flexible undersea airbag through pipelines.

[0018] A further improvement of the offshore tower-type wind and photovoltaic power generation system with compressed air energy storage according to the present invention lies in:

[0019] Further, the photosensitive element on the photosensitive motor senses the changes in the light intensity and angle, and adjusts the angle of the photovoltaic panel.

[0020] The present invention has the following beneficial effects:

[0021] When the offshore tower-type wind and photovoltaic power generation system with compressed air energy storage according to the present invention is in specific operation, a fixed tower platform is adopted, which can better adapt to extreme offshore weather and is not easily damaged by wind and waves. In addition, a flexible undersea airbag is used for gas storage, and the flexible undersea airbag is placed below the sea surface, and the static pressure of the sea water is used to keep the pressure of the airbag constant. This not only saves the device cost, but also has high safety and stability in gas storage, solves the problem of unstable power output caused by the intermittency of solar energy and wind energy, improves the stability and quality of power generation. In addition, it should be noted that the present invention forms an effective supplement to solar energy and wind energy through the compressed air energy storage device, making the output electric energy more smoothly and stably grid-connected.

[0022] Further, by adopting a photosensitive motor, the photovoltaic panel can be adjusted according to the light intensity and angle, improving the power generation efficiency of the system.

[0023] Further, the present invention adopts a flexible undersea airbag, the size of which changes with the gas storage volume, and can ensure that the pressure in the airbag is constant. The compressed air energy storage system device is placed at a certain depth below the sea surface, does not occupy the space of the working platform, and the gas storage space changes with the gas storage volume.

[0024] Further, the rotating shaft seat is installed on the tower platform through bolts, which is convenient, simple and firm to fix. Description of the Drawings

[0025] The accompanying drawings forming a part of the present invention are used to provide a further understanding of the present invention. The schematic embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0026] Figure 1 is a structural diagram of the present invention.

[0027] Among them, 1 is a wind turbine, 2 is a rotating shaft seat, 3 is a photovoltaic panel, 4 is a photosensitive motor, 5 is a tower platform, 6 is a compressor, 7 is a turbine, 8 is a subsea flexible airbag, and 9 is a generator. Detailed implementation manners

[0028] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0029] In the description of the present invention, it should be understood that the terms "include" and "comprise" indicate the presence of the described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or their combinations.

[0030] It should also be understood that the terms used in the specification of the present invention are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the specification of the present invention and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include the plural forms.

[0031] It should be further understood that the term " / and" as used in the specification of the present invention and the appended claims refers to any combination and all possible combinations of one or more of the associated listed items, and includes these combinations. For example, A and / or B can represent: the existence of A alone, the existence of both A and B, and the existence of B alone. In addition, the character " / " in the present invention generally represents an "or" relationship between the front and rear associated objects.

[0032] It should be understood that although the terms first, second, third, etc. may be used in the embodiments of the present invention to describe preset ranges, etc., these preset ranges should not be limited to these terms. These terms are only used to distinguish the preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0033] Depending on the context, as used herein, the word "if" can be interpreted as "when" or "while" or "in response to determining" or "in response to detecting". Similarly, depending on the context, the phrase "if determined" or "if detecting (stated condition or event)" can be interpreted as "when determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)".

[0034] To make the objectives, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are some, but not all, of the embodiments of the present invention. Generally, the components described and shown in the accompanying drawings herein can be arranged and designed in various different configurations. Therefore, the detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without making creative efforts fall within the scope of protection of the present invention.

[0035] Schematic diagrams of various structures according to the disclosed embodiments of the present invention are shown in the drawings. These figures are not drawn to scale, where for the purpose of clear expression, some details are enlarged and some details may be omitted. The shapes of various regions and layers shown in the figures and their relative sizes and positional relationships are merely exemplary, and may actually deviate due to manufacturing tolerances or technical limitations, and those skilled in the art can design regions / layers with different shapes, sizes and relative positions according to actual needs.

[0036] As is well known, Compressed Air Energy Storage (CAES) is an energy storage technology that utilizes the surplus electricity during the low load period of the power system. Through an electric motor driving an air compressor, air is compressed and stored in a closed space, and the compressed air is released to drive a steam turbine to generate electricity during the high load period of power consumption. The working principle is as follows:

[0037] Energy storage stage: During the low load period of the power grid, the surplus electric energy is used to drive the air compressor to work, compress the air to a high pressure state, and seal and store the high-pressure air in a specific gas storage device (such as an underground cave, salt cavern, abandoned mine or high-pressure gas storage tank, etc.). At the same time, the heat generated during the air compression process can be recovered and stored through a heat exchanger for use during power generation.

[0038] Energy release stage: When the power grid load reaches the peak, the high-pressure air in the gas storage device is released and enters an expander (such as a turbine expander) to do work, converting the pressure energy of the air into mechanical energy, and then driving a generator to generate electricity. During the energy release process, if necessary, the high-pressure air can be heated using the previously stored heat to increase its temperature and pressure, thereby improving the power generation efficiency.

[0039] Embodiment 1

[0040] Reference Figure 1 , the offshore tower-type wind and photovoltaic power generation system with compressed air energy storage according to the present invention includes a tower platform 5, a compressed air energy storage device, and a wind power generation system. A photovoltaic power generation system, a compressor 6, a turbine 7, and a generator 9 are provided on the tower platform 5. The wind power generation system includes a wind turbine unit 1, and the wind turbine unit 1 is installed on the tower platform 5. The compressed air energy storage device includes a flexible underwater airbag 8, and the flexible underwater airbag 8 is placed below the sea surface. The compressor 6 and the turbine 7 are connected to the flexible underwater airbag 8 through pipelines, and the generator 9 is connected to the turbine 7; the photovoltaic power generation system includes a photovoltaic panel 3, a rotating shaft seat 2, and a photosensitive motor 4. Among them, the output shaft of the photosensitive motor 4 is connected to the photovoltaic panel 3 through a rotating shaft; the compressor 6 and the turbine 7 are connected to the flexible underwater airbag 8 through pipelines, and the photosensitive element on the photosensitive motor 4 senses the changes in light intensity and angle and adjusts the angle of the photovoltaic panel 3.

[0041] Embodiment 2

[0042] Reference Figure 1 , further, the offshore tower-type wind and photovoltaic power generation system with compressed air energy storage according to the present invention includes a tower platform 5, a compressed air energy storage device, and a wind power generation system. A photovoltaic power generation system, a compressor 6, a turbine 7, and a generator 9 are provided on the tower platform 5. The wind power generation system includes a wind turbine unit 1, and the wind turbine unit 1 is installed on the tower platform 5. The compressed air energy storage device includes a flexible underwater airbag 8, and the flexible underwater airbag 8 is placed below the sea surface. The compressor 6 and the turbine 7 are connected to the flexible underwater airbag 8 through pipelines, and the generator 9 is connected to the turbine 7.

[0043] In this embodiment, the photovoltaic power generation system includes a rotating shaft seat 2, a photovoltaic panel 3, a rotating shaft seat 2, and a photosensitive motor 4. Among them, the output shaft of the photosensitive motor 4 is connected to the photovoltaic panel 3 through a rotating shaft; the rotating shaft is installed on the rotating shaft seat 2, and the rotating shaft seat 2 is installed on the tower platform 5 through bolts. The photosensitive element on the photosensitive motor 4 senses the changes in light intensity and angle and adjusts the angle of the photovoltaic panel 3. The photosensitive motor 4 is connected to the power output end of the wind power generation system, the compressor 6 is connected to the power output end of the wind power generation system, and the compressor 6 and the turbine 7 are connected to the flexible underwater airbag 8 through pipelines.

[0044] It should be noted that the tower platform 5 is made of reinforced concrete, and the working platform is fixed on the sea surface using pile foundations. The system uses solar and wind energy as the main energy sources for power generation, and a compressed air energy storage system is used for auxiliary power distribution.

[0045] Specifically, the wind power generation system converts the wind energy on the sea into electrical energy, and the photovoltaic power generation components convert solar energy into electrical energy. The generated electrical energy is mainly output for power supply. In the photovoltaic power generation system, the photosensitive elements in the photosensitive motor 4 sense the light intensity in real time, control the rotation of the photosensitive motor 4, adjust the photovoltaic panel 3 to the most suitable light-receiving angle, and then adjust and grid-connect the electrical energy through an inverter. The undersea flexible airbag 8 is placed under the sea surface and fixed at a certain depth underwater using a chain. The pressure inside the airbag is kept constant by the hydrostatic pressure of the sea water. The undersea flexible airbag has high gas storage safety, low device cost, and does not occupy the space of the tower platform 5. When solar and wind energy are sufficient, the surplus part is used to drive the compressor 6 to work. The compressor 6 inputs the generated high-pressure gas into the undersea flexible airbag 8 for storage. When solar and wind energy are insufficient, the undersea flexible airbag 8 releases the high-pressure gas, which flows through the turbine 7 and drives the generator 9 to work, converting the air pressure energy into electrical energy and outputting it externally. Therefore, the compressed air energy storage device in this system can effectively supplement solar and wind energy, making the output electrical energy smoother and more stable for grid connection.

[0046] The compressed air energy storage system uses the undersea flexible airbag 8, which saves device cost. Its size changes with the gas storage volume and can ensure that the pressure inside the airbag is constant. The compressed air energy storage system device is placed at a certain depth under the sea surface, does not occupy the space of the working platform, and the gas storage space changes with the gas storage volume. In addition, in the photovoltaic power generation components, the photosensitive elements in the photosensitive motor 4 can sense the changes in light intensity and angle in real time and make appropriate adjustments to the photovoltaic panel 3.

[0047] After considering the specification and the disclosure of the invention, those skilled in the art will readily think of other embodiments of the present invention. This application aims to cover any variations, uses, or adaptations of the present invention, which follow the general principles of the present invention and include the common general knowledge or conventional technical means in the technical field not disclosed in the present invention. The specification and the embodiments are only regarded as exemplary, and the true scope and spirit of the present invention are pointed out by the following claims.

[0048] It should be understood that the present invention is not limited to the exact structures described above and shown in the drawings, and various modifications and changes can be made without departing from its scope. The scope of the present invention is only limited by the appended claims.

[0049] The above are only the preferred embodiments of the present invention, and do not impose any limitations on the present invention. Any simple modifications, changes, and equivalent structural changes made to the above embodiments based on the technical essence of the present invention still fall within the protection scope of the technical solution of the present invention.

Claims

1. An offshore tower wind photovoltaic power generation system with compressed air energy storage, characterized in that: The invention comprises a tower platform (5), a compressed air energy storage device and a wind power generation system. The tower platform (5) is provided with a photovoltaic power generation system, a compressor (6), a turbine (7) and a generator (9). The wind power generation system comprises a wind turbine set (1). The wind turbine set (1) is installed on the tower platform (5). The compressed air energy storage device comprises a submarine flexible air bag (8). The submarine flexible air bag (8) is placed below the sea surface. The compressor (6) and the turbine (7) are connected to the submarine flexible air bag (8) through a pipeline. The generator (9) is connected to the turbine (7).

2. The offshore tower wind photovoltaic power generation system with compressed air energy storage according to claim 1, characterized in that: The photovoltaic power generation system comprises a photovoltaic panel (3), a rotating shaft seat (2) and a photosensitive motor (4), wherein the output shaft of the photosensitive motor (4) is connected to the photovoltaic panel (3) via the rotating shaft.

3. The offshore tower wind photovoltaic power generation system with compressed air energy storage according to claim 2, characterized in that: The photovoltaic power generation system further comprises a rotating shaft seat (2), and the rotating shaft is mounted on the rotating shaft seat (2).

4. The offshore tower wind photovoltaic power generation system with compressed air energy storage according to claim 3, characterized in that: The rotating shaft seat (2) is mounted on the tower platform (5) by means of bolts.

5. The offshore tower wind photovoltaic power generation system with compressed air energy storage according to claim 1, characterized in that: The photosensitive element on the photosensitive motor (4) senses changes in light intensity and angle, and adjusts the angle of the photovoltaic panel (3).

6. The offshore tower wind photovoltaic power generation system with compressed air energy storage according to claim 5, characterized in that: The photosensitive motor (4) is connected to the power output end of the wind power generation system.

7. The offshore tower wind photovoltaic power generation system with compressed air energy storage according to claim 1, characterized in that: The compressor (6) is connected to the power output end of the wind power generation system.

8. The offshore tower wind photovoltaic power generation system with compressed air energy storage according to claim 1, characterized in that: The compressor (6) and turbine (7) are connected to the seabed flexible air bag (8) through a pipeline.

9. An offshore wind-tower photovoltaic power generation system with compressed air energy storage, characterized in that: The invention comprises a tower platform (5), a compressed air energy storage device and a wind power generation system. The tower platform (5) is provided with a photovoltaic power generation system, a compressor (6), a turbine (7) and a generator (9). The wind power generation system comprises a wind turbine set (1). The wind turbine set (1) is installed on the tower platform (5). The compressed air energy storage device comprises a submarine flexible air bag (8). The submarine flexible air bag (8) is placed below the sea surface. The compressor (6) and the turbine (7) are connected to the submarine flexible air bag (8) through a pipeline. The generator (9) is connected to the turbine (7). The photovoltaic power generation system comprises a photovoltaic panel (3), a rotating shaft seat (2) and a photosensitive motor (4), wherein the output shaft of the photosensitive motor (4) is connected to the photovoltaic panel (3) via the rotating shaft; The compressor (6) and turbine (7) are connected to the seabed flexible air bag (8) through a pipeline.

10. The offshore tower wind photovoltaic power generation system with compressed air energy storage according to claim 9, characterized in that: The photosensitive element on the photosensitive motor (4) senses changes in light intensity and angle, and adjusts the angle of the photovoltaic panel (3).

Images