Air energy storage type continuous power supply wind power generation system and control method

Abstract

This invention relates to the field of wind power generation technology, and provides a wind power generation system and control method for continuous power supply using air energy storage, comprising: a controller, and a wind power generation device, a wind power compression device, and an air storage tank, all connected to the controller. The wind power generation device transmits electrical energy to a power-consuming plant through a transmission line; the wind power compression device is connected to the air storage tank through an air transmission pipeline, and the air storage tank is connected to a compressed air generator through an air transmission pipeline. The compressed air generator is used to compress air into electrical energy and transmit the electrical energy to the power-consuming plant through the transmission line.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, and in particular to a wind power generation system and control method with air energy storage for continuous power supply. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] Although wind power generation is widespread, the following problems still exist:

[0004] 1. Unstable power supply: Wind power generation is greatly affected by environmental factors, such as weather changes, sometimes no wind or weak wind, which can prevent wind power generation equipment from generating electricity, resulting in power supply interruption.

[0005] 2. Low tower strength: In some harsh environmental conditions, when the wind is strong, the blade rotation speed is too high, which causes the tower to bend.

[0006] 3. Low space utilization of the tower column: The inner cavity of the tower column is a hollow structure with a large internal space and low utilization rate. Summary of the Invention

[0007] This invention provides a wind power generation system and control method with air energy storage for continuous power supply, which solves problems such as unstable power supply, low utilization rate of tower internal space and poor structural mechanical performance of tower.

[0008] To achieve the above objectives, the present invention adopts the following technical solution:

[0009] In a first aspect, the present invention provides a wind power generation system with air energy storage for continuous power supply.

[0010] A wind power generation system with air energy storage and continuous power supply includes: a controller, and a wind power generation device, a wind power compression device, and an air storage tank, all connected to the controller. The wind power generation device transmits electrical energy to a power-consuming plant through a transmission line. The wind power compression device is connected to the air storage tank through an air transmission pipeline, and the air storage tank is connected to a compressed air generator through an air transmission pipeline. The compressed air generator is used to convert compressed air into electrical energy and transmit the electrical energy to the power-consuming plant through the transmission line.

[0011] Furthermore, the wind power generation device includes a first wind turbine assembly and a wind power detection device connected to a controller; the wind power detection device is installed on the wind turbine of the first wind turbine assembly to detect the wind speed and send the wind speed to the controller; the first wind turbine assembly is used to convert wind energy into electrical energy.

[0012] Furthermore, the first wind turbine assembly also includes a tower structure for mounting the wind turbine. The tower structure includes nested outer and inner circular tube columns, which are connected by several supporting reinforcement blocks.

[0013] Furthermore, the wind power compression device includes a second wind turbine assembly and an air compressor. The second wind turbine assembly is connected to the air compressor, and the rotation of the second wind turbine assembly drives the air compressor to compress air.

[0014] Furthermore, the second wind turbine assembly includes a wind turbine and a tower structure for mounting the wind turbine. The tower structure includes nested outer and inner circular tube columns, which are connected by several supporting reinforcing blocks. An air bladder is provided inside the inner circular tube column, and the air compressor is connected to the air bladder through an air pipe. The air bladder is used to store the air compressed by the air compressor.

[0015] Furthermore, the second wind turbine assembly also includes a pressure sensor group and an electromagnetic control valve group. Both the pressure sensor group and the electromagnetic control valve group are connected to the controller. The pressure sensor group is used to detect the pressure of the air bladder and send the detected air bladder pressure to the controller. The electromagnetic control valve group is used to control the gas in the air bladder to be transported to the gas storage tank through the gas delivery pipeline.

[0016] Furthermore, the air inlet of the gas storage tank is equipped with a one-way valve.

[0017] Furthermore, the outlet of the gas storage tank is equipped with a first pressure sensor and a first electromagnetic control valve. The first pressure sensor is used to detect the air pressure delivered by the gas storage tank to the power plant through the gas pipeline, and the first electromagnetic control valve is used to control the delivery of the gas in the gas storage tank to the gas plant through the gas pipeline.

[0018] Furthermore, the outlet of the gas storage tank is also equipped with a second pressure sensor and a second electromagnetic control valve. The second pressure sensor is used to detect the air pressure delivered by the gas storage tank to the compressed air generator through the gas delivery pipeline, and the second electromagnetic control valve is used to control the delivery of gas in the gas storage tank to the compressed air generator through the gas delivery pipeline.

[0019] Secondly, the present invention provides a control method for a wind power generation system with air energy storage and continuous power supply.

[0020] A control method for a wind power generation system with air-based energy storage and continuous power supply, employing the air-based energy storage and continuous power supply wind power generation system described in the first aspect, comprising:

[0021] During peak electricity consumption periods, the controller determines whether the wind force detected by the wind power detection device exceeds a set threshold. If so, the wind power generation device converts wind energy into electrical energy, which is then transmitted to the power plant via transmission lines. The wind power compression device is only used to compress air and store the compressed air in the air bladder. When the pressure in at least two air bladders exceeds the set threshold, the controller controls at least one electromagnetic control valve in the electromagnetic control valve group to open, and the compressed air enters the air storage tank.

[0022] Otherwise, the controller opens the second solenoid valve, and compressed air is delivered to the compressed air generator to convert air energy into electrical energy, which is then transmitted to the power-consuming factory through the power transmission line.

[0023] When the controller receives a gas demand request from the gas plant, it controls the first solenoid valve to open, and compressed air is delivered to the gas plant.

[0024] Compared with the prior art, the beneficial effects of the present invention are:

[0025] 1. Current wind power generation cannot provide continuous power supply and is greatly affected by environmental factors. This invention can convert wind energy into compressed air energy and store it in the tower cavity and air tank. It can release the compressed air energy to power the wind turbine even in windless conditions.

[0026] 2. In the absence of wind, this invention can convert the stored compressed air energy into wind turbine kinetic energy to generate electricity, achieving continuous and stable power supply.

[0027] 3. In a wind power generation system, some of the wind turbines convert wind energy into compressed air energy and store it in the air bladder or air tank inside the tower, making full use of the internal space of the tower.

[0028] 4. The tower structure designed in this invention adopts a nested structure, with an outer tower column containing an inner layer of tower columns, and the tower columns are connected by supporting reinforcement blocks. Through simulation, the nested tower column structure has higher strength and better mechanical properties than ordinary tower column structures. Attached Figure Description

[0029] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0030] Figure 1 This is a structural diagram of the wind power generation system with air energy storage and continuous power supply shown in this invention;

[0031] Figure 2 This is a cross-sectional view of the embedded tower column shown in this invention;

[0032] Figure 3This is a perspective view of the embedded tower column shown in this invention;

[0033] Figure 4 This is a cross-sectional view of a conventional tower column as shown in this invention;

[0034] Figure 5 This is a schematic diagram illustrating the tower column constraint conditions and the application of external loads as shown in this invention.

[0035] Figure 6 This is a comparison diagram of the linear stress collected by the tower column as shown in this invention. Detailed Implementation

[0036] The present invention will be further described below with reference to the accompanying drawings and embodiments.

[0037] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0038] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0039] Example 1

[0040] like Figure 1 As shown, this embodiment provides a wind power generation system with air energy storage for continuous power supply.

[0041] A wind power generation system with air energy storage and continuous power supply includes: a controller, and a wind power generation device, a wind power compression device, and an air storage tank, all connected to the controller. The wind power generation device transmits electrical energy to a power-consuming plant through a transmission line. The wind power compression device is connected to the air storage tank through an air transmission pipeline, and the air storage tank is connected to a compressed air generator through an air transmission pipeline. The compressed air generator is used to convert compressed air into electrical energy and transmit the electrical energy to the power-consuming plant through the transmission line.

[0042] The wind power generation device includes a first wind turbine and a wind power detection device connected to a controller; the wind power detection device is installed on the wind turbine of the first wind turbine and is used to detect the wind speed and send the wind speed to the controller; the first wind turbine is used to convert wind energy into electrical energy.

[0043] The first wind turbine assembly also includes a tower structure for mounting the wind turbines. The tower structure includes nested outer and inner circular tube columns, which are connected by several supporting reinforcement blocks.

[0044] The wind power compression device includes a second wind turbine and an air compressor. The second wind turbine is connected to the air compressor, and the rotation of the second wind turbine drives the air compressor to compress air.

[0045] The second wind turbine assembly includes a wind turbine and a tower structure for mounting the wind turbine. The tower structure includes nested outer and inner circular tube columns. The outer and inner circular tube columns are connected by several supporting reinforcing blocks. An air bladder is provided inside the inner circular tube column. The air compressor is connected to the air bladder through an air pipe. The air bladder is used to store the air compressed by the air compressor.

[0046] The second wind turbine group also includes a pressure sensor group and an electromagnetic control valve group. Both the pressure sensor group and the electromagnetic control valve group are connected to the controller. The pressure sensor group is used to detect the pressure of the air bladder and send the detected air bladder pressure to the controller. The electromagnetic control valve group is used to control the gas in the air bladder to be transported to the gas storage tank through the gas pipeline.

[0047] The gas storage tank is equipped with a one-way valve at its inlet.

[0048] The gas storage tank is equipped with a first pressure sensor and a first electromagnetic control valve at its outlet. The first pressure sensor is used to detect the air pressure delivered from the gas storage tank to the power plant through the gas pipeline, and the first electromagnetic control valve is used to control the delivery of the gas in the gas storage tank to the gas plant through the gas pipeline.

[0049] The outlet of the gas storage tank is also equipped with a second pressure sensor and a second electromagnetic control valve. The second pressure sensor is used to detect the air pressure delivered by the gas storage tank to the compressed air generator through the gas delivery pipeline, and the second electromagnetic control valve is used to control the delivery of the gas in the gas storage tank to the compressed air generator through the gas delivery pipeline.

[0050] In this embodiment, the windmill is equipped with an air compressor. The windmill blades rotate to drive the internal mechanical transmission structure of the compressor to obtain compressed air. The main function is to convert wind energy into mechanical energy and then into compressed air energy.

[0051] When there is no wind or the wind is weak, the stored compressed air is released to drive the generator to generate electricity, so that the power supply is continuous and stable.

[0052] The tower structure was optimized by adopting a double-walled design to enhance its strength and ensure uniform stress distribution. Furthermore, when the outer circular tube column suffers damage, the inner circular tube column provides support and protection for the entire system.

[0053] The inner cylindrical column stores compressed air, thus making full use of the internal space and reducing resource waste.

[0054] A wind power generation device, within a suitable wind range, uses the natural wind to rotate the windmill, converting wind energy into mechanical energy, and finally into electrical energy, which is then supplied to power plants.

[0055] A wind power compressor compresses and stores air. During peak grid load periods, wind power generation devices that indirectly convert wind energy into electricity cannot meet power demand. The wind power compressor then releases compressed air to a compressed air generator. The compressed air generator uses a compressor to compress the air and store it in a high-pressure cylinder. The high-pressure air enters the turbine from the high-pressure cylinder, driving the turbine impeller to rotate at high speed. The impeller coupling drives the generator to generate electricity. The generator transmits the electricity to the power plant through transmission lines. The used low-pressure air is discharged through the exhaust pipe. The compressor then compresses the air from the storage tank and stores it in a high-pressure cylinder, repeating the above process.

[0056] Tower column structure: such as Figure 2 and Figure 3 As shown, the structure includes nested outer and inner circular tube columns, connected by supporting reinforcement blocks. An air bladder is placed inside the inner cavity of the inner tube column. Compressed air from the wind turbine continuously fills the air bladder, causing it to expand and increase in volume until it completely fills the entire tube space. The inner tube column provides support and protection for the air bladder, maintaining pressure on the injected gas, while the air bladder acts as a seal. With a fixed tower structure, filling it with air within a certain pressure range creates pressure on the tower, enhancing its mechanical properties and making it less prone to deformation under external forces.

[0057] Gas storage tank: In the entire wind power generation system, the gas storage tank is mainly used to store the air energy converted by the wind turbine. Whether or not to install the gas storage tank depends on the actual working conditions. If the internal space of the tower is sufficient to store the air energy, the gas storage tank does not need to be installed.

[0058] like Figure 1As shown, wind turbine unit 2 stores compressed air inside the gas storage tower. Pressure sensors P2, P3, and P4 transmit the internal pressure of the tower to the system controller in real time. When the pressure inside the gas storage tower reaches a certain level, the sensors transmit the pressure information to the system controller. The system controller determines whether the pressure values ​​of sensors P2, P3, and P4 have reached the set pressure threshold (the threshold needs to be adjusted according to the specific structure and actual operating conditions), and opens the corresponding solenoid control valves S2, S3, and S4 accordingly. When two or three of sensors P2, P3, and P4 simultaneously reach the threshold, the system controls it to open only one of the solenoid control valves S2, S3, and S4. The solenoid control valve is set to open for a certain period of time, storing the compressed air in the gas storage tank. After a period of time, the solenoid control valve closes. When the pressure values ​​of sensors P2, P3, and P4 reach the set pressure threshold again, the cycle repeats in the same way.

[0059] Pressure sensor P1 mainly detects the internal pressure of the air tank in real time. When the factory is in peak electricity consumption and the power is insufficient, the system controller will open the electromagnetic control valve S5 to fill the compressed air generator set 3 with compressed air to generate electricity for the factory.

[0060] When the plant needs compressed gas, the system controller opens the solenoid control valve S1 to supply the plant with the gas.

[0061] To demonstrate the superior mechanical properties of nested tower structures, we examined nested tower structures (such as...) Figure 2 (as shown) and non-nested tower columns (such as Figure 4 A mechanical simulation was performed (as shown). During the actual operation of the wind turbine, the stress on the tower column is quite complex. To simplify the analysis model, only one external load was applied to the tower column. The constraints and external load of the tower column are as follows: Figure 5 As shown, the bottom surface of the tower column is fixed, and a vertical external load of 10000N is applied to the top surface. The stress changes at the stress acquisition lines of the embedded tower column and the ordinary tower column are calculated respectively. The stress at each point of the acquisition line is then presented as a curve, as shown below. Figure 6As shown in the figure, the horizontal axis represents the distance from each point on the stress acquisition line to the bottom surface of the tower column, and the vertical axis represents the stress value at each point. The solid line represents the stress variation with distance on the stress acquisition line of the embedded tower column, and the dashed line represents the stress variation with distance on the stress acquisition line of the ordinary tower column. It can be seen from the figure that the stress at each point on the stress acquisition line of the embedded tower column is lower than that of the ordinary tower column, and the entire surface of the tower column is subjected to uniform stress, thus making the embedded tower column more resistant to external loads than the ordinary tower column. When the embedded tower column is filled with gas at a certain pressure, the inner wall of the tower column will be subjected to a certain pressure, which can further enhance the mechanical properties of the tower column. This simulation analysis strongly demonstrates the superior mechanical performance of the embedded tower column structure, greatly increasing the safety and reliability of wind power generation devices.

[0062] Example 2

[0063] This embodiment provides a control method for a wind power generation system with air-based energy storage and continuous power supply.

[0064] A control method for a wind power generation system with air-based energy storage and continuous power supply, employing the air-based energy storage and continuous power supply wind power generation system described in Example 1, includes:

[0065] During peak electricity consumption periods, the controller determines whether the wind force detected by the wind power detection device exceeds a set threshold. If so, the wind power generation device converts wind energy into electrical energy, which is then transmitted to the power plant via transmission lines. The wind power compression device is only used to compress air and store the compressed air in the air bladder. When the pressure in at least two air bladders exceeds the set threshold, the controller controls at least one electromagnetic control valve in the electromagnetic control valve group to open, and the compressed air enters the air storage tank.

[0066] Otherwise, the controller opens the second solenoid valve, and compressed air is delivered to the compressed air generator to convert air energy into electrical energy, which is then transmitted to the power-consuming factory through the power transmission line.

[0067] When the controller receives a gas demand request from the gas plant, it controls the first solenoid valve to open, and compressed air is delivered to the gas plant.

[0068] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A wind power generation system with air energy storage and continuous power supply, characterized in that, Includes: a controller, and wind power generation equipment, wind compressor equipment and gas storage tank, all connected to the controller; The wind power generation device includes a first wind turbine unit and a wind power detection device connected to a controller, and transmits electrical energy to the power-consuming plant through a transmission line; the first wind turbine unit also includes a tower structure for mounting the wind turbines; The wind power compression device includes a second wind turbine and an air compressor, which is connected to an air storage tank via an air supply pipeline. The air storage tank is connected to a compressed air generator via the air supply pipeline. The compressed air generator is used to convert compressed air into electrical energy and transmit the electrical energy to the power-consuming plant via a power transmission line. The second wind turbine assembly includes a wind turbine and a tower structure for mounting the wind turbine. The tower structure includes a nested outer circular tube column and an inner circular tube column. The outer circular tube column and the inner circular tube column are connected by several supporting reinforcing blocks. An air bladder is provided inside the inner circular tube column. The air compressor is connected to the air bladder through an air pipe. The air bladder is used to store the air compressed by the air compressor. The airbag is configured to expand and fill the internal space of the inner circular tube column during inflation; the compressed air in the airbag is configured to apply pressure to the inner wall of the inner circular tube column to enhance the mechanical properties of the tower column structure. The second wind turbine group also includes a pressure sensor group and an electromagnetic control valve group. Both the pressure sensor group and the electromagnetic control valve group are connected to the controller. The pressure sensor group is used to detect the pressure of the air bladder and send the detected air bladder pressure to the controller. The electromagnetic control valve group is used to control the gas in the air bladder to be transported to the gas storage tank through the gas pipeline. The controller is configured to: when the pressure in at least two airbags simultaneously reaches a set threshold, control only one electromagnetic control valve in the electromagnetic control valve group to open, and set the opening time of the electromagnetic control valve to deliver the compressed air in the airbag to the air storage tank through the air supply pipeline, and close the electromagnetic control valve after the opening time ends.

2. The wind power generation system with air energy storage and continuous power supply according to claim 1, characterized in that, The wind power detection device is installed on the windmill of the first wind turbine group to detect the wind force and send the wind force data to the controller; the first wind turbine group is used to convert wind energy into electrical energy.

3. The wind power generation system with air energy storage and continuous power supply according to claim 1, characterized in that, The tower structure of the first wind turbine unit includes nested outer and inner circular tube columns, which are connected by several supporting reinforcement blocks.

4. The wind power generation system with air energy storage and continuous power supply according to claim 1, characterized in that, The second wind turbine is connected to an air compressor, and the rotation of the second wind turbine drives the air compressor to compress air.

5. The air-storage type continuous power supply wind power generation system according to claim 1, characterized in that, The gas storage tank is equipped with a one-way valve at its inlet.

6. The wind power generation system with air energy storage and continuous power supply according to claim 1, characterized in that, The gas storage tank is equipped with a first pressure sensor and a first electromagnetic control valve at its outlet. The first pressure sensor is used to detect the air pressure delivered from the gas storage tank to the power plant through the gas pipeline, and the first electromagnetic control valve is used to control the delivery of the gas in the gas storage tank to the gas plant through the gas pipeline.

7. The wind power generation system with air energy storage and continuous power supply according to claim 1, characterized in that, The outlet of the gas storage tank is also equipped with a second pressure sensor and a second electromagnetic control valve. The second pressure sensor is used to detect the air pressure delivered by the gas storage tank to the compressed air generator through the gas delivery pipeline, and the second electromagnetic control valve is used to control the delivery of the gas in the gas storage tank to the compressed air generator through the gas delivery pipeline.

8. A control method for a wind power generation system with air energy storage and continuous power supply, characterized in that, The wind power generation system using air-storage continuous power supply as described in any one of claims 1-7 includes: During peak electricity consumption periods, the controller determines whether the wind force detected by the wind power detection device exceeds a set threshold. If so, the wind power generation device converts wind energy into electrical energy, which is then transmitted to the power plant via transmission lines. The wind power compression device is only used to compress air and store the compressed air in the air bladder. When the pressure in at least two air bladders exceeds the set threshold, the controller controls at least one electromagnetic control valve in the electromagnetic control valve group to open, and the compressed air enters the air storage tank. Otherwise, the controller opens the second solenoid valve, and compressed air is delivered to the compressed air generator to convert air energy into electrical energy, which is then transmitted to the power-consuming factory through the power transmission line. When the controller receives a gas demand request from the gas plant, it controls the first solenoid valve to open, and compressed air is delivered to the gas plant.

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