Wind power generation system and method using compressed air to replenish wind

Abstract

The present invention relates to the technical field of wind power generation, and specifically to a wind power generation system and method using compressed air for air supply. The wind power generation system using compressed air for air supply of the present invention comprises an air supply device arranged on the wind rotor blade of the wind turbine; the air supply device comprises an air supply nozzle, a nozzle connecting rod, a vertical rod and a conveying duct; the two ends of the nozzle connecting rod are connected to the front side of the wind rotor blade through the vertical rod; the conveying duct is arranged inside the wind rotor blade, and its input end is connected to the outlet of the compressed air storage tank, and the output end is connected to the air supply nozzle; the air supply nozzle is evenly arranged on the nozzle connecting rod, and the spray direction is the same as the incoming wind direction and directly faces the leading edge stagnation point of the wind rotor blade. The present invention provides a wind power generation system and method using compressed air for air supply, which has a simple structure, reasonable design, stable power output, and can effectively improve the system's adaptability to environmental wind speed and grid load requirements.

Description

Technical Field

[0001] The present invention relates to the technical field of wind power generation, and in particular to a wind power generation system and method utilizing compressed air for wind replenishment. Background Art

[0002] Wind turbines are devices that convert wind energy into electrical energy. They are generally composed of wind rotors, generators, directional controllers, towers, speed limit safety mechanisms, etc. The working principle of a wind turbine is relatively simple. The wind rotor rotates under the action of wind force, converting the kinetic energy of the wind into mechanical energy of the wind rotor shaft. The generator rotates and generates electricity driven by the wind rotor shaft. However, wind power generation is greatly affected by the wind speed of the wind farm: on the one hand, when the wind speed is less than the cut-in wind speed (usually 3m / s), the wind turbine is cut out of the power grid and stops generating electricity due to the small torque provided by the wind; on the other hand, when the power grid has a high load demand, the wind speed of the wind farm often cannot provide enough power for the wind turbine, and it can only operate at partial load. Therefore, wind power generation is greatly affected by natural conditions and needs to be coordinated with energy storage technology.

[0003] Compressed air energy storage is a technology that uses surplus electricity during low-load periods of the power grid to compress air, store it in high-pressure sealed facilities, and release it during peak power consumption to drive gas turbines to generate electricity. Domestic research units have conducted research on compressed air driving generators through expanders to generate electricity, realizing the use of surplus electricity during low-load periods of the power grid to compress air and store it in high-pressure sealed facilities, and during peak power consumption, compressed air driving generators through expanders to generate electricity. The above technology has high energy utilization efficiency, but the system is complex and cannot solve the problems of wind power generation being greatly affected by wind speed in the wind field, unstable output power, and poor adaptability. Summary of the invention

[0004] In view of the problems existing in the prior art, the present invention provides a wind power generation system and method using compressed air for wind replenishment, which has a simple structure, reasonable design, stable power output, and can effectively improve the system's adaptability to ambient wind speed and grid load demand.

[0005] The present invention is achieved through the following technical solutions:

[0006] A wind power generation system using compressed air for air supply includes an air supply device arranged on a wind wheel blade of a wind power generator; the air supply device includes an air supply nozzle, a nozzle connecting rod, a vertical rod and a conveying duct;

[0007] The two ends of the nozzle connecting rod are connected to the front side of the wind wheel blade through vertical rods;

[0008] The delivery duct is arranged inside the wind wheel blade, the input end of which is connected to the outlet of the compressed air storage tank, and the output end of which is connected to the air supply nozzle;

[0009] The air supply nozzles are evenly arranged on the nozzle connecting rod, and the spraying direction is the same as the incoming wind direction and directly faces the leading edge stagnation point of the wind wheel blades.

[0010] Furthermore, the number of the vertical rods is two and they are symmetrically arranged; one end of the two vertical rods is connected to the nozzle connecting rod, and the other end is vertically connected to the wind wheel blade.

[0011] Furthermore, the nozzle connecting rod is arranged parallel to the front side of the wind wheel blade, and an air supply nozzle is arranged on the side opposite to the wind wheel blade.

[0012] Furthermore, the conveying duct includes a main pipe and a branch pipe; the main pipe passes through the hollow shaft of the wind turbine and enters the hub, one end of which is connected to the outlet of the compressed air storage tank, and the other end is respectively connected to the input end of each branch pipe; the branch pipe is arranged inside the wind wheel blade, and the output end thereof is connected to the air supply nozzle; the number of the branch pipes corresponds to the number of the wind wheel blades.

[0013] Furthermore, the main pipe includes a non-rotating main pipe and a rotating main pipe, and the non-rotating main pipe and the rotating main pipe are converted and connected by a rotating dynamic sealing mechanism arranged at the outer head of the hub; the branch pipe is a rotating component that rotates with the wind wheel blades, and the input end of the branch pipe is connected to the rotating main pipe.

[0014] Furthermore, a first adjustment device is provided between the nozzle connecting rod and the wind wheel blade via a vertical rod; a second adjustment device is provided between the nozzle connecting rod and the air supply nozzle via a vertical rod; and both the first adjustment device and the second adjustment device are angle adjustment devices.

[0015] Furthermore, the first adjusting device is used to adjust the angle of angle a; the angle a is the angle between the nozzle connecting rod and the chord line of the wind wheel blade.

[0016] Furthermore, the second adjustment device is used to adjust the angle of angle b; the angle b is the angle between the nozzle connecting rod and the direction of the air supply nozzle nozzle.

[0017] A wind power generation method using compressed air to supplement wind, comprising:

[0018] When the wind power generation load is greater than the grid demand, the surplus electricity is used to compress the air and store it in a compressed air storage tank;

[0019] When the wind speed in the wind farm is lower than the cut-in wind speed or the grid demand load is higher than the wind power generation load, the compressed air stored in the compressed air storage tank is sent to the air supply nozzle through the delivery duct and sprayed out to supply air to the wind turbine rotor blades to complete wind power generation.

[0020] Furthermore, according to the change of the windward angle of the wind turbine rotor blades, the angle ranges of angle a and angle b are controlled respectively by the first adjusting device and the second adjusting device, so that the direction of the ejected compressed air is the same as the incoming wind direction and is directly opposite to the leading edge stagnation point of the wind turbine rotor blades.

[0021] Compared with the prior art, the present invention has the following beneficial technical effects:

[0022] The system of the present invention is provided with an air supply device on the rotor blades of the wind turbine, and the air supply device is connected to a compressed air storage tank. Thus, when the wind power generation load is greater than the grid demand, the surplus power is used to compress the air and store it in the compressed air storage tank. When the wind speed in the wind field is less than the cut-in wind speed, the compressed air is sent through a delivery pipeline to the air supply nozzle arranged on the nozzle connecting rod on the front side of the rotor blade and then sprayed out for air supply, thereby increasing the incoming flow wind speed at the front end of the rotor blade to be greater than the cut-in wind speed, supporting the wind turbine to operate stably at low wind speeds, improving the equipment's adaptability to environmental wind speeds, and improving the equipment's utilization efficiency. At the same time, when the grid demand load is greater than the wind power generation load (due to the low wind speed, the wind turbine output is reduced), the compressed air can also be sent to the nozzle of the air supply nozzle to supplement the incoming flow of the rotor blades, thereby increasing the incoming flow wind speed at the front end of the rotor blades, thereby increasing the wind turbine generator output.

[0023] Furthermore, the two vertical rods used in the system of the present invention are symmetrically arranged, and both ends of the vertical rods are respectively connected to the nozzle connecting rod and the wind wheel blade to ensure stability and operability.

[0024] Furthermore, the system of the present invention can effectively increase the incoming wind speed at the front end of the wind rotor blades and improve the equipment's adaptability to ambient wind speed by arranging the nozzle connecting rod parallel to the front side of the wind rotor blades and arranging the air supply nozzle on the side opposite to the nozzle connecting rod and the wind rotor blades.

[0025] Furthermore, the system of the present invention adopts main pipes and branch pipes to transport compressed air, which is efficient and convenient, and can effectively ensure the transport effect, so that the wind added to the wind wheel blades is uniform, reliable and stable.

[0026] Furthermore, the system of the present invention connects the rotating rotating component branch pipe and the rotating main pipe, and adopts a rotary dynamic sealing mechanism between the rotating main pipe and the non-rotating main pipe to achieve a conversion connection, so that the compressed air can be efficiently and reliably delivered to the air supply nozzle, thereby supplementing the incoming wind speed and improving efficiency.

[0027] Furthermore, the first adjustment device and the second adjustment device used in the system of the present invention are both angle adjustment devices, which can realize angle adjustment of angle a and angle b, that is, according to the change of the windward angle of the wind wheel blades, the adjusted air supply can produce maximum lift and the air supply effect is optimal. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 Schematic diagram of the streamlines of airflow passing through the wind turbine rotor blades.

[0029] Figure 2 Schematic diagram of the structure of the system in the embodiment of the present invention.

[0030] Figure 3 It is a schematic diagram of the installation structure of the air supply device and the wind turbine rotor blades.

[0031] Figure 4 for Figure 3 Schematic diagram of the AA section structure.

[0032] Figure 5 Schematic diagram of the connection between the nozzle connecting rod and the vertical rod.

[0033] In the figure: 1-air supply nozzle, 2-nozzle connecting rod, 3-air supply device, 4-vertical rod, 5-first regulating device, 6-second regulating device, 7-compressed air storage tank, 8-wind wheel blades, 9-main pipe, 10-branch pipe. DETAILED DESCRIPTION

[0034] The present invention is further described in detail below in conjunction with specific embodiments, which are intended to explain the present invention rather than to limit it.

[0035] The present invention utilizes a wind power generation system using compressed air to replenish wind, such as Figure 2-5 As shown, it includes a wind turbine, a compressed air storage tank 7, and an air supply device 3 composed of an air supply nozzle 1, a nozzle connecting rod 2, a vertical rod 4 and a conveying duct;

[0036] like Figure 2 and Figure 4 As shown, the front side of the wind turbine blade 8 is connected to the two ends of the nozzle connecting rod 2 through two symmetrically arranged vertical rods 4; the nozzle connecting rod 2 is arranged parallel to the front side of the wind turbine blade 8, and the side opposite to the wind turbine blade 8 is evenly provided with a supplementary air nozzle 1, and the injection direction of the supplementary air nozzle 1 is the same as the incoming wind direction and is directly opposite to the leading edge stagnation point of the wind turbine blade 8; Figure 1 As shown, due to the influence of the wind rotor blade 8 on the airflow, the streamlines are bent along the geometric shape of the wind rotor blade 8. There is a leading edge stagnation point at the front end of the wind rotor blade 8. The streamlines above the leading edge stagnation point flow through the upper surface of the wind rotor blade 8, and the streamlines below the leading edge stagnation point flow through the lower surface of the wind rotor blade 8. Due to the bulge on the upper surface of the wind rotor blade 8, the airflow flowing through the upper surface of the wind rotor blade 8 is accelerated and the pressure is reduced. The airflow flowing through the lower surface of the wind rotor blade 8 has a speed smaller than that of the upper surface, and a pressure greater than the pressure on the upper surface of the wind rotor blade 8. The pressure difference between the upper and lower surfaces of the wind rotor blade 8 is the lift of the wind rotor blade 8. On a wind turbine, the lift drives the wind rotor blade 8 to rotate around the impeller shaft to generate electricity.

[0037] Among them, Figure 3 As shown, the vertical rods 4 are two symmetrically arranged rods, one end of each of which is connected to the nozzle connecting rod 2, and the other end is perpendicular to the wind wheel blade 8; a plurality of air supply nozzles 1 are evenly arranged on the side opposite to the nozzle connecting rod 2 and the wind wheel blade 8, and the air supply nozzles 1 are connected to the branch pipe 10.

[0038] The first adjusting device 5 and the second adjusting device 6 are driven by a servo motor to transmit power to the gears connected to the rotating shafts of the nozzle connecting rod 2 and the vertical rod 4, thereby driving the nozzle connecting rod 2 and the vertical rod 4 to achieve angle adjustment of angle a and angle b; Figure 5 As shown, the first adjusting device 5 is used to adjust the angle a, which is the angle between the nozzle connecting rod 2 and the chord line of the wind rotor blade 8; the second adjusting device 6 is used to adjust the angle b, which is the angle between the nozzle direction of the air supply nozzle 1 and the nozzle connecting rod 2; according to the change of the windward angle of the wind rotor blade 8, the first adjusting device 5 and the second adjusting device 6 are adjusted respectively to control the angle a and the angle b, so that the direction of the compressed air ejected from the air supply nozzle 1 is the same as the incoming wind direction and faces the leading edge stagnation point of the wind rotor blade 8. The air supply will produce the maximum lift and the air supply effect is the best.

[0039] like Figure 2 As shown, the delivery duct of the air supply device 3 includes a main pipe 9 that passes through the hollow shaft of the wind turbine and enters the hub, and a branch pipe 10 that is arranged inside the wind wheel blade 8; the input end of the main pipe 9 is connected to the outlet of the compressed air storage tank 7, and the output end is respectively connected to the input end of each branch pipe 10; the number of branch pipes 10 corresponds to the number of wind wheel blades 8, and the output end of each branch pipe 10 is connected to the inlet of the air supply nozzle 1; the branch pipe 10 is a rotating component that rotates with the blades, and the main pipe 9 includes a non-rotating main pipe and a rotating main pipe; the rotating main pipe is connected to the branch pipe 10, and a rotary dynamic sealing mechanism is arranged between the non-rotating main pipe and the rotating main pipe to realize the conversion connection between the rotating component branch pipe 10 and the non-rotating main pipe; the rotary dynamic sealing mechanism is arranged at the head outside the hub, that is, the non-rotating area outside the hub, and the rotary dynamic sealing mechanism can adopt a felt ring seal or an O-ring seal, or other forms of sealing methods.

[0040] Among them, Figure 3 As shown, the air supply nozzle 1 is located at the leading edge of the wind rotor blade 8 and is connected to the leading edge of the wind rotor blade 8 via a nozzle connecting rod 2. The compressed air is transported to the air supply nozzle 1 area via a branch pipe 10 located inside the wind rotor blade 8.

[0041] In actual use, when the wind power generation load is greater than the grid demand, the surplus power is used to compress the air and store it in the compressed air storage tank 7. When the wind speed in the wind farm is less than the cut-in wind speed, the compressed air is ejected through the air supply nozzle 1 arranged in front of the wind rotor blade 8 to supply air, thereby increasing the incoming wind speed at the front end of the wind rotor blade 8 to make it greater than the cut-in wind speed, and supporting the stable operation of the wind turbine at a low wind speed. When the grid demand load is greater than the wind power generation load, the compressed air stored in the compressed air storage tank 7 is sent to the air supply nozzle 1 through the delivery duct and ejected to supply air to the incoming flow of the wind turbine blade 8 to complete wind power generation.

[0042] Based on any of the above systems, the present invention also provides a wind power generation method using compressed air to supplement wind, comprising:

[0043] When the wind power generation load is greater than the grid demand, the surplus power is used to compress air and the compressed air is stored in the compressed air storage tank 7;

[0044] When the wind speed in the wind field is lower than the cut-in wind speed, the compressed air stored in the compressed air storage tank 7 is sent to the air supply nozzle 1 through the delivery duct and sprayed out to supply air to the wind turbine rotor blades 8, thereby completing wind power generation;

[0045] When the grid demand load is greater than the wind power generation load, the compressed air stored in the compressed air storage tank 7 is sent to the air supply nozzle 1 through the delivery duct and sprayed out to supply air to the wind turbine rotor blades 8 to complete wind power generation.

[0046] Among them, according to the change of the windward angle of the wind turbine rotor blade 8, the angle ranges of angle a and angle b are controlled respectively by the first adjusting device 5 and the second adjusting device 6, so that the direction of the ejected compressed air is the same as the incoming wind direction and is directly opposite to the leading edge stagnation point of the wind turbine rotor blade 8.

[0047] The wind power generation system and method using compressed air to replenish wind described in the present invention are also applicable to vertical axis wind turbines.

Claims

1. A wind power generation system using compressed air for air supply, comprising an air supply device (3) arranged on a wind turbine blade (8) of a wind turbine; the air supply device (3) comprising an air supply nozzle (1), a nozzle connecting rod (2), a vertical rod (4) and a conveying duct; The two ends of the nozzle connecting rod (2) are connected to the front side of the wind wheel blade (8) via vertical rods (4); The delivery duct is arranged inside the wind wheel blade (8), the input end of the delivery duct is connected to the outlet of the compressed air storage tank (7), and the output end is connected to the air supply nozzle (1); The air supply nozzles (1) are evenly arranged on the nozzle connecting rod (2), and the spraying direction is the same as the incoming wind direction and directly faces the leading edge stagnation point of the wind wheel blades (8); A first adjusting device (5) is provided between the nozzle connecting rod (2) and the wind wheel blade (8) via a vertical rod (4); a second adjusting device (6) is provided between the nozzle connecting rod (2) and the air supply nozzle (1) via a vertical rod (4); The first adjustment device (5) and the second adjustment device (6) are both angle adjustment devices; The first adjustment device (5) is used to adjust the angle of angle a; the angle a is the angle between the nozzle connecting rod (2) and the chord line of the wind wheel blade (8); The second adjustment device (6) is used to adjust the angle of angle b; the angle b is the angle between the nozzle connecting rod (2) and the direction of the nozzle of the air supply nozzle (1); According to the change in the windward angle of the wind turbine rotor blade (8), the first adjustment device (5) and the second adjustment device (6) are used to control the angle ranges of angle a and angle b respectively, so that the direction of the ejected compressed air is the same as the incoming wind direction and faces the leading edge stagnation point of the wind turbine rotor blade (8).

2. The wind power generation system using compressed air to supply wind according to claim 1 is characterized in that: The number of the vertical rods (4) is two and they are symmetrically arranged; one end of the two vertical rods (4) is connected to the nozzle connecting rod (2), and the other end is vertically connected to the wind wheel blade (8).

3. The wind power generation system using compressed air to supply wind according to claim 1, characterized in that: The nozzle connecting rod (2) is arranged parallel to the front side of the wind wheel blade (8), and an air supply nozzle (1) is arranged on the side opposite to the wind wheel blade (8).

4. The wind power generation system using compressed air to supply wind according to claim 1, characterized in that: The conveying duct comprises a main pipe (9) and a branch pipe (10); the main pipe (9) passes through the hollow shaft of the wind turbine and enters the hub, one end of which is connected to the outlet of the compressed air storage tank (7), and the other end is respectively connected to the input end of each branch pipe (10); the branch pipe (10) is arranged inside the wind wheel blade (8), and the output end thereof is connected to the air supply nozzle (1); the number of the branch pipes (10) corresponds to the number of the wind wheel blades (8).

5. The wind power generation system using compressed air to supply wind according to claim 4 is characterized in that: The main pipe (9) comprises a non-rotating main pipe and a rotating main pipe, and the non-rotating main pipe and the rotating main pipe are connected by a rotary dynamic sealing mechanism arranged at the outer head of the hub; the branch pipe (10) is a rotating component that rotates with the wind wheel blades (8), and the input end of the branch pipe (10) is connected to the rotating main pipe.

6. A method for wind power generation using compressed air for wind replenishment, based on the system according to any one of claims 1 to 5, characterized in that: include, When the wind power generation load is greater than the grid demand, the surplus power is used to compress air, and the compressed air is stored in a compressed air storage tank (7); When the wind speed in the wind farm is less than the cut-in wind speed or the load required by the power grid is greater than the wind power generation load, the compressed air stored in the compressed air storage tank (7) is sent to the air supply nozzle (1) through the delivery duct and sprayed out to supply air to the wind turbine rotor blades (8), thereby completing wind power generation.

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