Photovoltaic and compressed air energy storage integrated platform and control method

Abstract

The invention belongs to the technical field of photovoltaic equipment, and discloses a photovoltaic and compressed air energy storage integrated platform and a control method, and the platform comprises a platform, the upper surface of which is provided with a photovoltaic module and compressed air energy storage equipment; the compressed air energy storage equipment is positioned in the center of the platform; the plurality of photovoltaic modules are positioned on the peripheral side of the compressed air energy storage equipment and are electrically connected with the compressed air energy storage equipment; and the air storage bags are uniformly distributed on the lower surface of the platform and are communicated with the compressed air energy storage equipment. The photovoltaic module and the compressed air energy storage equipment are used, electric energy of the photovoltaic module can supply power to the compressed air energy storage equipment in a working state, then the compressed air inflates the air storage bag, the whole device floats on the water surface while energy is stored, and then air in the air storage bag can be released to the compressed air energy storage equipment; and the energy of the compressed air is converted into electric energy.

Description

Technical Field

[0001] The present invention belongs to the technical field of photovoltaic equipment, and in particular relates to a photovoltaic and compressed air energy storage integrated platform and a control method. Background Art

[0002] Compressed air energy storage is a physical energy storage technology with the characteristics of large-scale, low-cost, high safety, clean and pollution-free. It is mainly composed of a compressor, an expander, and a gas storage system. The technical principle is that when electricity consumption is low, the compressor is driven by an electric motor to compress the air and store it in the gas storage system; when electricity consumption is high, the high-pressure air is released into the expander to do work and drive the generator to generate electricity.

[0003] Gas storage methods mainly include pressure vessels such as gas storage tanks, underground caves such as natural salt caverns, artificial underground gas storage reservoirs, underwater gas storage bags, etc. Among them, underwater gas storage bags have flexible site selection, high gas storage volume utilization rate, and better air safety.

[0004] Floating photovoltaics have maintained rapid development in recent years. At present, the global installed capacity has exceeded 3GW. It has significant advantages in saving land resources, reducing water pollution, promoting "fish-light complementarity", reducing the temperature of photovoltaic modules, and expanding various application scenarios. Floating photovoltaics can be set up on floating platforms on water bodies such as the sea, lake, reservoir, water treatment pool, and aquaculture pond. Compared with ground photovoltaics, the main problem of floating photovoltaics is that operation and maintenance and supporting energy storage are more difficult. In addition, the buoyancy of floating photovoltaics mostly comes from blow-molded floats, which are still insufficient in terms of environmental protection and low carbon.

[0005] The photovoltaic and energy storage integrated power station is a form of photovoltaic + energy storage industry that has been strongly supported by policies in recent years. Through supporting electrochemical energy storage, it can effectively regulate the instability of photovoltaic power generation, promote the consumption of photovoltaic green electricity, improve efficiency and reduce carbon emissions. However, at present, photovoltaic and energy storage integrated power stations are mainly used on the ground, and are less used in floating photovoltaic power stations. Moreover, the energy storage form is limited to electrochemical energy storage, which has limited scale and poor safety. In addition to the difficulty of operation and maintenance of floating photovoltaic power stations, the difficulty of rescue is further increased when accidents occur in electrochemical energy storage. Summary of the invention

[0006] In order to solve at least one problem in the background technology, the present invention proposes a photovoltaic and compressed air energy storage integrated platform and a control method.

[0007] In order to achieve the above object, the present invention adopts the following technical solutions:

[0008] A photovoltaic and compressed air energy storage integrated platform, comprising:

[0009] A platform with photovoltaic modules and compressed air energy storage equipment installed on its upper surface;

[0010] The compressed air energy storage device is located at the center of the platform;

[0011] A plurality of photovoltaic modules are located around the compressed air energy storage device and are electrically connected to the compressed air energy storage device;

[0012] There are several air storage bags, which are evenly distributed on the lower surface of the platform and connected to the compressed air energy storage equipment.

[0013] Preferably, the photovoltaic assembly comprises a photovoltaic bracket and a photovoltaic panel;

[0014] The photovoltaic bracket is installed on the upper surface of the platform, and the photovoltaic panel is installed on the photovoltaic bracket.

[0015] Preferably, the compressed air energy storage device comprises a buffer chamber, an expander, a generator, a compressor and a motor;

[0016] The buffer chamber is installed on the platform surface and is connected to the air storage bag;

[0017] The expander is connected to the buffer chamber;

[0018] The generator is electrically connected to the expander;

[0019] The compressor is connected to the buffer chamber;

[0020] The electric motor is electrically connected to the compressor.

[0021] Preferably, a flexible gas pipeline is connected between the gas storage bag and the buffer chamber, and the gas storage bag and the buffer chamber are communicated through the flexible gas pipeline.

[0022] Preferably, a plurality of fixed cages are installed on the lower surface of the platform, and the fixed cages are used to place air storage bags.

[0023] Preferably, a plurality of flexible fixing ropes are connected between the air storage bag and the fixing cage.

[0024] Preferably, the plurality of fixed cages divide the lower surface of the platform into n areas, where n≥1.

[0025] A control method for photovoltaic and compressed air energy storage, used for the above-mentioned photovoltaic and compressed air energy storage integrated platform, includes the following steps:

[0026] Convert solar energy into electricity through photovoltaic panels;

[0027] The electrical energy is transmitted to the motor to make the compressor work. The compressor forms high-pressure air and fills it into the air storage bag until the air pressure in the air storage bag reaches the maximum set pressure.

[0028] Preferably, the control method of photovoltaic and compressed air energy storage further includes a deflation step:

[0029] The air storage bag releases air into the buffer chamber;

[0030] The gas enters the expander to do work, driving the generator to generate electricity.

[0031] Preferably, the control method of photovoltaic and compressed air energy storage further includes a regulation step:

[0032] The lower surface of the platform is divided into n areas, each area corresponds to an air storage bag, n ≥ 1;.

[0033] Detect the horizontal heights corresponding to n areas;

[0034] If it is detected that the level of the i-th area is less than a preset value, the air storage bag in the i-th area is inflated, and / or the air storage bags in areas adjacent to the i-th area are inflated until the level of the i-th area reaches the preset value.

[0035] Beneficial effects of the present invention:

[0036] 1. The present invention uses photovoltaic modules and compressed air energy storage equipment. In the working state, the electricity of the photovoltaic modules can power the compressed air energy storage equipment, and then the compressed air inflates the air storage bag, storing energy while making the entire device float on the water surface, and then the gas in the air storage bag can be released to the compressed air energy storage equipment, thereby generating electricity for the generator, converting the energy of the compressed air into electrical energy;

[0037] 2. The present invention makes full use of the buoyancy of the underwater air storage bag to effectively support the floating photovoltaic and compressed air energy storage system equipment, and reduce the use of plastic floating materials such as blow-molded floats. It effectively promotes the integration of floating photovoltaic and compressed air energy storage, realizes the efficient, safe and land-saving storage of photovoltaic green electricity, expands the site selection range of integrated power stations on lakes and seas, and also expands diversified application scenarios such as "fish-light complementarity" and "marine platform".

[0038] Other features and advantages of the present invention will be described in the following description, and partly become obvious from the description, or be understood by implementing the present invention. The purpose and other advantages of the present invention can be realized and obtained by the structures pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0040] Figure 1 A schematic diagram of the structure of a photovoltaic and compressed air energy storage integrated platform of the present invention is shown;

[0041] Figure 2 A control structure diagram of the air storage bag of the present invention is shown;

[0042] Figure 3 A layout structure diagram of the air storage bag of the present invention is shown.

[0043] In the figure: 1. Platform; 2. Buffer chamber; 3. Expander; 4. Generator; 5. Compressor; 6. Electric motor; 7. Photovoltaic bracket; 8. Photovoltaic panel; 9. Gas storage bag; 10. Flexible gas pipeline; 11. Flexible fixing rope; 12. Fixed cage. DETAILED DESCRIPTION

[0044] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0045] An integrated photovoltaic and compressed air energy storage platform, such as Figure 1 As shown, it includes a platform 1, a photovoltaic module and a compressed air energy storage device. The photovoltaic module and the compressed air energy storage device are installed on the upper surface of the platform 1, and the compressed air energy storage device is located at the center of the platform 1; then a number of photovoltaic modules are located around the compressed air energy storage device and are electrically connected to the compressed air energy storage device; in addition, a number of air storage bags 9 are arranged, which are evenly distributed on the lower surface of the platform 1 and are connected to the compressed air energy storage device.

[0046] It should be noted that Figure 1 The structure integrates photovoltaic modules and compressed air energy storage equipment on platform 1. The floating photovoltaic modules are responsible for generating electricity, and the excess electricity generated is stored in the compressed air energy storage system. When the floating photovoltaic power generation is insufficient, the compressed air energy storage system releases the stored electricity to supplement the supply of electricity. The floating photovoltaic is fixed on the rigid platform 1 to ensure stability.

[0047] Furthermore, the photovoltaic assembly includes a photovoltaic bracket 7 and a photovoltaic panel 8 ; the photovoltaic bracket 7 is mounted on the upper surface of the platform 1 , and the photovoltaic panel 8 is mounted on the photovoltaic bracket 7 .

[0048] It should be noted that the photovoltaic assembly of the present invention may also be provided with a corresponding control unit, and the orientation and angle of the photovoltaic panel 8 may be adjusted by the control unit, so as to improve the efficiency of collecting light energy.

[0049] Furthermore, the compressed air energy storage device includes a buffer chamber 2, an expander 3, a generator 4, a compressor 5 and an electric motor 6. The buffer chamber 2 is installed on the surface of the platform 1 and is connected to the air storage bag 9. The expander 3 is connected to the buffer chamber 2, the generator 4 is electrically connected to the expander 3, the compressor 5 is connected to the buffer chamber 2, and the electric motor 6 is electrically connected to the compressor 5.

[0050] It should be noted that the compressed air energy storage equipment can ensure the conversion of electrical energy and compressed air energy, and the equipment is fixed on a rigid raft platform (platform 1); considering the balance and buffering of the high-pressure air of multiple underwater air storage bags 9, a compressed air buffer chamber 2 is set to ensure the stable operation of the compressed air energy storage equipment; during the inflation and power storage process, excess electrical energy is transmitted to the motor 6, and the motor 6 drives the compressor 5 to compress high-pressure air and fill it into the underwater air storage bag 9; during the deflation and power generation process, the underwater air storage bag 9 releases gas, which is transmitted to the expander 3, driving the expander 3 to do work, and driving the generator 4 to generate electricity.

[0051] Furthermore, a flexible gas pipeline 10 is connected between the gas storage bag 9 and the buffer chamber 2, and the gas storage bag 9 and the buffer chamber 2 are connected through the flexible gas pipeline 10. In addition, a plurality of fixed cages 12 are installed on the lower surface of the platform 1, and the fixed cages 12 are used to place the gas storage bag 9. In addition, a plurality of flexible fixed ropes 11 are connected between the gas storage bag 9 and the fixed cages 12. Specifically, flexible fixed ropes 11 are arranged around each underwater gas storage bag 9, and the ropes are connected to the fixed cages 12 to ensure that the gas storage bag does not move over a large range in the fixed cage when the volume changes. In addition, the plurality of fixed cages 12 divide the lower surface of the platform 1 into n areas, where n≥1.

[0052] A control method for photovoltaic and compressed air energy storage is used for the above photovoltaic and compressed air energy storage integrated platform, including an inflation step, a deflation step and an adjustment step, which are specifically described below:

[0053] In the inflation step, solar energy is converted into electrical energy through photovoltaic components; the electrical energy is transmitted to the motor 6 to operate the compressor 5, and the compressor 5 forms high-pressure air and fills it into the air storage bag 9 until the air pressure of the air storage bag 9 reaches the maximum set pressure.

[0054] In the deflation step, the deflation step: the gas storage bag 9 deflates gas into the buffer chamber 2; the gas enters the expander 3 to perform work, driving the generator 4 to generate electricity.

[0055] In the adjustment step, the lower surface of the platform 1 is divided into n areas, each area corresponds to an air storage bag 9, n ≥ 1; then the horizontal heights corresponding to the n areas are detected; if the horizontal height of the i-th area is detected to be less than a preset value, the air storage bag 9 in the i-th area is inflated, and / or the air storage bag 9 in the area adjacent to the i-th area is inflated until the horizontal height of the i-th area reaches the preset value.

[0056] It should be noted that the pressure and volume of each gas storage bag 9 are dynamically distributed and adjusted through the buffer chamber 2. While satisfying the inflation and deflation functions of the compressed air energy storage system, the pressure and volume of different gas storage bags 9 can be flexibly adjusted to cope with disturbances such as sea waves and water waves, ensure the stability of the platform 1, and avoid problems such as the device tilting and overturning. The following introduces a method for controlling the gas storage bag 9, see Figure 2 .

[0057] like Figure 2 As shown, the present invention can also be provided with a controller, which is connected to n solenoid valves, each of which can be installed on the flexible gas pipeline 10. Specifically, each solenoid valve is numbered, denoted as S1, S2, ...Si, ...Sn, corresponding to each gas storage bag 9.

[0058] like Figure 3 As shown, S1 to S16 are solenoid valves, which correspond to 16 air storage bags 9. During the control process, the air storage bags 9 should be uniformly stressed. For example, among the air storage bags 9 corresponding to S1 to S4, at least two air storage bags 9 are in working state. Preferably, the air storage bags 9 corresponding to S1 and S4 are selected as working state. Similarly, among the air storage bags 9 corresponding to S1, S5, S9 and S13, at least two air storage bags 9 are in working state. The working state corresponding to S1 and S13 is preferred. For example, during the adjustment step, due to disturbances such as sea waves and water waves, Figure 3 The corner of the platform 1 corresponding to the gas storage bag 9 corresponding to S1 ( Figure 3 When the raft platform (in the middle, the upper left corner) sinks and tilts, high-pressure air is added to S1 to increase the volume of the air storage bag 9 corresponding to S1, thereby increasing the local buoyancy and raising one corner of the raft platform to keep the platform horizontal and ensure the efficient operation of the photovoltaic and compressed air systems.

[0059] When the volume adjustment effect of increasing the air storage bag 9 corresponding to S1 is limited, the horizontal state of the platform 1 can be further adjusted by increasing the volume of the air storage bags 9 corresponding to S2 and S5, and reducing the air storage bags 9 corresponding to S16, S12 and S15 at the diagonal positions by deflating. If the adjustment effect is still insufficient, or if a faster adjustment is desired, more air storage bags 9 can be adjusted to change their volumes in the same principle to restore the level of the raft platform faster and better.

[0060] By analogy, on the basis that the air storage bag 9 meets the basic requirements of inflation and deflation of the compressed air energy storage system, combined with various possible posture inclinations of the platform 1, the horizontal stability of the platform 1 can be ensured by increasing and decreasing the volume of each air storage bag 9 to a certain extent.

[0061] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A photovoltaic and compressed air energy storage integrated platform, characterized in that: include: A platform (1) having photovoltaic modules and compressed air energy storage equipment installed on its upper surface; The compressed air energy storage device is located at the center of the platform (1); A plurality of the photovoltaic modules are located around the compressed air energy storage device and are electrically connected to the compressed air energy storage device; A plurality of air storage bags (9) are provided, evenly distributed on the lower surface of the platform (1), and are connected to the compressed air energy storage device.

2. A photovoltaic and compressed air energy storage integrated platform according to claim 1, characterized in that: The photovoltaic assembly comprises a photovoltaic bracket (7) and a photovoltaic panel (8); The photovoltaic support (7) is mounted on the upper surface of the platform (1), and the photovoltaic panel (8) is mounted on the photovoltaic support (7).

3. The photovoltaic and compressed air energy storage integrated platform according to claim 2, characterized in that: The compressed air energy storage device comprises a buffer chamber (2), an expander (3), a generator (4), a compressor (5) and an electric motor (6); The buffer chamber (2) is installed on the surface of the platform (1) and is in communication with the air storage bag (9); The expander (3) is connected to the buffer chamber (2); The generator (4) is electrically connected to the expander (3); The compressor (5) is connected to the buffer chamber (2); The electric motor (6) is electrically connected to the compressor (5).

4. The photovoltaic and compressed air energy storage integrated platform according to claim 3, characterized in that: A flexible gas pipeline (10) is connected between the gas storage bag (9) and the buffer chamber (2), and the two are in communication with each other through the flexible gas pipeline (10).

5. A photovoltaic and compressed air energy storage integrated platform according to any one of claims 1 to 4, characterized in that: A plurality of fixed cages (12) are also installed on the lower surface of the platform (1), and the fixed cages (12) are used to place the air storage bags (9).

6. The photovoltaic and compressed air energy storage integrated platform according to claim 5, characterized in that: A plurality of flexible fixing ropes (11) are connected between the air storage bag (9) and the fixing cage (12).

7. The photovoltaic and compressed air energy storage integrated platform according to claim 5, characterized in that: The plurality of fixed cages (12) divide the lower surface of the platform (1) into n areas, where n≥1.

8. A control method for photovoltaic and compressed air energy storage, used in a photovoltaic and compressed air energy storage integrated platform according to any one of claims 1 to 6, characterized in that: Including inflation steps: Convert solar energy into electricity through photovoltaic panels; The electric energy is transmitted to the motor (6) to make the compressor (5) work, and the compressor (5) forms high-pressure air and fills it into the air storage bag (9) until the air pressure of the air storage bag (9) reaches the maximum set pressure.

9. A control method for photovoltaic and compressed air energy storage according to claim 8, characterized in that: Including the deflation step: The air storage bag (9) releases air into the buffer chamber (2); The gas enters the expander (3) to perform work, driving the generator (4) to generate electricity.

10. A control method for photovoltaic and compressed air energy storage according to claim 8, characterized in that: The adjustment steps include: Divide the lower surface of the platform (1) into n areas, each area corresponds to an air storage bag (9), and n≥1; Detect the horizontal heights corresponding to n areas; If it is detected that the water level of the i-th area is less than a preset value, the air storage bag (9) of the i-th area is inflated, and / or the air storage bag (9) in an area adjacent to the i-th area is inflated, until the water level of the i-th area reaches the preset value.

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