A wind power generation system

Abstract

A wind power generation system provided by the present invention belongs to the technical field of wind power generation, and includes: a transmission mechanism, a generator, a compressor, an expander, and a gas storage tank; the main shaft of the compressor is connected to the third transmission shaft through the first clutch, the main shaft of the expander is connected to the fourth transmission shaft through the second clutch, and the first clutch and the second clutch do not work at the same time; when the first clutch is closed, the second clutch is disconnected, and the gas storage tank stores energy through the compressor; when the second clutch is closed, the first clutch is disconnected, and the gas storage tank releases energy through the expander. The compression energy storage mode and the expansion assist mode of the present invention operate separately and do not coexist, so as to avoid mutual interference between the two modes and cause low utilization of wind energy.

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. Background Art

[0002] A wind turbine is a clean energy power generation device that converts wind energy into electrical energy. It mainly uses wind power to drive the fan blades to rotate. The fan main shaft connected to the blades drives the generator rotor to rotate and generate electricity. The electrical energy is then output as constant frequency alternating current through rectification and inversion equipment.

[0003] Due to the randomness and time-varying nature of wind power, the output power of wind turbines fluctuates greatly during the day and the speed changes frequently. Connecting them directly to the power grid will affect the stability and safety of the power grid operation. In order to solve the above problems, Chinese document CN102410150B discloses a mechanically coupled compressed air energy storage micro hybrid wind power generation system, in which the wind turbine is connected to a turbine compound machine through a planetary gear; when the wind speed is high, the turbine compound machine stores excess energy in the air tank through a compression energy storage mode; when the wind speed is low, the turbine compound machine transfers the energy of the air tank to the wind motor through an expansion assist mode.

[0004] In the above-mentioned wind power generation system, when the compression energy storage mode and the expansion assist mode of the turbine compound machine are operated simultaneously, during the expansion assist process, the compression energy storage will consume energy as a load mode, thereby reducing the energy utilization rate. Summary of the invention

[0005] Therefore, the technical problem to be solved by the present invention is to overcome the defect of low energy utilization rate of the mechanical coupling wind power generation system in the prior art, thereby providing a wind power generation system.

[0006] In order to solve the above technical problems, the present invention provides a wind power generation system, comprising:

[0007] Transmission mechanism, generator, compressor, expander and gas storage tank;

[0008] The transmission mechanism comprises a first transmission shaft, a second transmission shaft, a third transmission shaft and a fourth transmission shaft which are rotatably arranged, the first transmission shaft is sleeved with a first gear, the second transmission shaft is sleeved with a second gear, the third transmission shaft is sleeved with a third gear, the fourth transmission shaft is sleeved with a fourth gear, and the second gear, the third gear and the fourth gear are all meshed with the outer teeth of the first gear;

[0009] The first transmission shaft is coaxially connected to the wind turbine hub, the second transmission shaft is coaxially connected to the input shaft of the generator, the third transmission shaft is coaxially connected to the main shaft of the compressor, and the fourth transmission shaft is coaxially connected to the main shaft of the expander;

[0010] The energy storage port of the gas storage tank is communicated with the exhaust port of the compressor, and the energy release port of the gas storage tank is communicated with the air inlet of the expander;

[0011] A first clutch is provided at the connection between the main shaft of the compressor and the third transmission shaft, and a second clutch is provided at the connection between the main shaft of the expander and the fourth transmission shaft. The control module controls the first clutch and the second clutch to work at different times.

[0012] Furthermore, it also includes a brake assembly arranged in the wind turbine cabin, the brake assembly has a brake member suitable for limiting the rotation of the first transmission shaft, and the brake assembly is connected to the control module signal.

[0013] Furthermore, the brake assembly comprises:

[0014] A rotating wheel is fixedly sleeved on the first transmission shaft, and a plurality of first electromagnets are arranged at intervals in the circumference of the rotating wheel;

[0015] The second electromagnet is connected in the wind turbine cabin and is suitable for performing adsorption braking with the first electromagnet of the rotor.

[0016] Furthermore, a wind sensor is installed on the top of the wind turbine cabin, and the wind sensor is signal-connected to the control module.

[0017] Furthermore, a support bearing is sleeved on the first transmission shaft, and the support bearing is fixed in the wind turbine cabin through a bearing seat.

[0018] Furthermore, the energy storage port and the energy release port of the gas storage tank are both connected to a flow regulating valve, and the flow regulating valve is signal-connected to the control module.

[0019] Furthermore, the gas storage tank is located in the bottom base of the tower, and the gas pipes on the compressor / expander are all accommodated in the tower.

[0020] Furthermore, the air inlet of the compressor and the exhaust port of the expander are both connected to the atmosphere.

[0021] The technical solution of the present invention has the following advantages:

[0022] 1. In the wind power generation system provided by the present invention, the main shaft of the compressor is connected to the third transmission shaft through the first clutch, the main shaft of the expander is connected to the fourth transmission shaft through the second clutch, and the first clutch and the second clutch do not work at the same time; when the first clutch is closed, the second clutch is disconnected, and the gas storage tank stores energy through the compressor; when the second clutch is closed, the first clutch is disconnected, and the gas storage tank releases energy through the expander. The above structure allows the compression energy storage mode and the expansion assist mode to operate separately and not coexist, avoiding the mutual interference of the two modes and resulting in low utilization of wind energy.

[0023] 2. The wind power generation system provided by the present invention limits the first transmission shaft through the braking assembly when the wind force level exceeds the control range, thereby avoiding damage to the entire system.

[0024] 3. In the wind power generation system provided by the present invention, the gas storage tank is located in the bottom base of the tower, thereby reducing the load on the top of the tower.

[0025] 4. In the wind power generation system provided by the present invention, the air inlet of the compressor and the exhaust port of the expander are both connected to the atmosphere, that is, the compressed energy storage medium is air, and the whole process is pollution-free and low-cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 This is a schematic diagram of the structure inside the wind turbine cabin.

[0028] Figure 2 Schematic diagram of the mechanical transmission structure in the wind turbine cabin.

[0029] Figure 3 This is a schematic diagram of the structure of the gas tank.

[0030] Figure 4 The figure is a schematic diagram of the overall structure of the wind power generation system provided in the present invention.

[0031] Description of reference numerals:

[0032] 1. Transmission mechanism; 2. Generator; 3. Compressor; 4. Expander; 5. Gas storage tank; 6. First transmission shaft; 7. Second transmission shaft; 8. Third transmission shaft; 9. Fourth transmission shaft; 10. First clutch; 11. Second clutch; 12. Rotor; 13. Bearing seat; 14. Wind sensor; 15. Flow control valve; 16. Wind turbine hub; 17. Wind turbine cabin; 18. Base; 19. Tower. DETAILED DESCRIPTION

[0033] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings. Obviously, the described embodiments are only 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.

[0034] In the description of the present invention, it should be noted that the terms "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, they cannot be understood as limitations on the present invention.

[0035] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0037] The wind power generation system provided in this embodiment includes: a transmission mechanism 1, a generator 2, a compressor 3, an expander 4 and a gas storage tank 5, and the transmission mechanism 1, the generator 2, the compressor 3 and the expander 4 are all located in the wind turbine cabin 17.

[0038] like Figure 1 , Figure 2As shown, the transmission mechanism 1 is a box-type structure, and the transmission mechanism 1 includes: a first transmission shaft 6, a second transmission shaft 7, a third transmission shaft 8 and a fourth transmission shaft 9 which are rotatably connected to the box body, the first transmission shaft 6 is in the middle position, and the other three transmission shafts are distributed around the first transmission shaft 6; the first transmission shaft 6 is sleeved with a first gear, the second transmission shaft 7 is sleeved with a second gear, the third transmission shaft 8 is sleeved with a third gear, and the fourth transmission shaft 9 is sleeved with a fourth gear, and the second gear, the third gear and the fourth gear are all meshed with the outer teeth of the first gear. The first transmission shaft 6 is coaxially connected to the wind turbine hub 16, the second transmission shaft 7 is coaxially connected to the input shaft of the generator 2, the third transmission shaft 8 is coaxially connected to the main shaft of the compressor 3 through the first clutch 10, and the fourth transmission shaft 9 is coaxially connected to the main shaft of the expander 4 through the second clutch 11, and the first clutch 10 and the second clutch 11 do not work at the same time. The energy storage port of the gas storage tank 5 is communicated with the exhaust port of the compressor 3 , and the energy release port of the gas storage tank 5 is communicated with the air inlet of the expander 4 .

[0039] In this embodiment, when the first clutch 10 is closed, the second clutch 11 is disconnected, the main shaft of the compressor 3 is connected to the third transmission shaft 8, the main shaft of the expander 4 is disconnected from the fourth transmission shaft 9, and the gas storage tank 5 stores energy through the compressor 3; when the second clutch 11 is closed, the first clutch 10 is disconnected, the main shaft of the compressor 3 is disconnected from the third transmission shaft 8, the main shaft of the expander 4 is connected to the fourth transmission shaft 9, and the gas storage tank 5 releases energy through the expander 4. The compression energy storage mode and the expansion assist mode are operated separately and do not coexist, so as to avoid mutual interference between the two modes and cause low utilization of wind energy.

[0040] like Figure 1 , Figure 2 As shown, a brake assembly is provided in the wind turbine cabin 17, and the brake assembly has a brake part suitable for limiting the rotation of the first transmission shaft 6. The brake assembly is connected to the control module signal, and the control module controls the operation of the brake assembly according to the wind force level. When the wind force level exceeds the control range, the first transmission shaft 6 is limited by the brake assembly, thereby avoiding damage to the entire system. The brake assembly includes: a rotor 12, a first electromagnet and a second electromagnet; the rotor 12 is fixedly sleeved on the first transmission shaft 6, and the rotor 12 has a plurality of first electromagnets arranged at intervals on the circumference; the second electromagnet is connected in the wind turbine cabin 17, and is used for adsorption braking with the first electromagnet of the rotor 12.

[0041] As an alternative implementation scheme, the brake assembly includes: a rotor 12 mounted on the first transmission shaft 6 and a friction brake connected to the wind turbine nacelle 17 , and the friction brake achieves braking by engaging and rubbing with the rotor 12 .

[0042] like Figure 1 , Figure 2 As shown, the transmission mechanism 1, the generator 2, the compressor 3 and the expander 4 are all arranged in the wind turbine cabin 17, the transmission mechanism 1 is located in the middle, the compressor 3 and the expander 4 are located in front of the transmission mechanism 1, and the generator 2 is located in the rear of the transmission mechanism 1. The compressor 3 and the expander 4 are respectively arranged on the left and right sides of the first transmission shaft 6, and the distance between the transmission mechanism 1 and the wind turbine hub 16 is increased, so the first transmission shaft 6 is longer; in order to make the first transmission shaft 6 drive smoothly, a support bearing is sleeved on the first transmission shaft 6, and the support bearing is fixed in the wind turbine cabin 17 through a bearing seat 13.

[0043] like Figure 1 As shown, a wind sensor 14 is installed on the top of the wind turbine cabin 17, and the wind sensor 14 is used to monitor the wind level in real time; the first clutch 10, the second clutch 11 and the wind sensor 14 are all connected to the control module signal, and the control module controls the first clutch 10 and the second clutch 11 to open and close according to the wind level signal.

[0044] like Figure 3 , Figure 4 As shown, the gas storage tank 5 is located in the bottom base 18 of the tower 19, and the gas pipes on the compressor 3 / expander 4 are all contained in the tower 19. The gas tank is located in the bottom base 18 of the tower 19 to reduce the load on the top of the tower 19; the gas pipe is connected to the gas storage tank 5 through the inside of the tower 19, and the gas pipe does not need to be provided with other protective covers, and can play a self-protection effect.

[0045] like Figure 3 As shown, the energy storage port and the energy release port of the gas storage tank 5 are both connected to a flow regulating valve 15, and the flow regulating valve 15 is connected to the control module signal, and the control module controls the opening amount of the flow regulating valve 15 according to the wind force level signal.

[0046] The wind turbine cabin 17 is provided with an air hole connected to the outside, and the air inlet of the compressor 3 and the exhaust port of the expander 4 are both connected to the atmosphere through the air hole, that is, the compressed energy storage medium is air, and the whole process is pollution-free and low-cost.

[0047] Working process:

[0048] When the energy provided by the external wind force is not much different from the load demand, the first clutch 10 and the second clutch 11 are both disconnected, the main shaft of the compressor 3 is disconnected from the third transmission shaft 8, and the main shaft of the expander 4 is also disconnected from the fourth transmission shaft 9; the wind turbine hub 16 rotates, and after being accelerated by the transmission mechanism 1, it drives the input shaft of the generator 2 to operate and generate electricity.

[0049] When the energy provided by the external wind force exceeds the load demand, the first clutch 10 is closed, the second clutch 11 is disconnected, the main shaft of the compressor 3 is connected to the third transmission shaft 8, and the main shaft of the expander 4 is disconnected from the fourth transmission shaft 9; the wind turbine hub 16 rotates, and a part of the wind energy is transmitted to the main shaft of the compressor 3 through the transmission mechanism 1, and the compression is operated. The air is sucked into the air inlet of the compressor 3, and the air is stored in the air storage tank 5 from the exhaust port of the compressor 3 after being pressurized; the other part of the wind energy is transmitted to the input shaft of the generator 2 through the transmission mechanism 1, and the generator 2 is operated to generate electricity. Since the operation of the compressor 3 consumes part of the wind power, the power generation capacity of the generator 2 is reduced.

[0050] When the energy provided by the external wind force cannot meet the load demand, the first clutch 10 is disconnected, the second clutch 11 is closed, the main shaft of the compressor 3 is disconnected from the third transmission shaft 8, and the main shaft of the expander 4 is connected to the fourth transmission shaft 9; the wind turbine hub 16 rotates, and all wind energy is transmitted to the input shaft of the generator 2 through the transmission mechanism 1 to operate and generate electricity; at the same time, the flow regulating valve 15 between the air inlet of the expander 4 and the gas storage tank 5 is opened, and the high-pressure gas in the gas storage tank 5 drives the main shaft of the expander 4 to rotate, and the main shaft of the expander 4 transmits energy to the input shaft of the generator 2 through the transmission mechanism 1 to operate and generate electricity.

[0051] When the energy provided by the external wind force far exceeds the load demand and is beyond the control range of the system, the control module controls the braking assembly to brake the first transmission shaft 6, and the wind power generation system stops generating electricity.

[0052] Obviously, the above embodiments are merely examples for the purpose of clear explanation, and are not intended to limit the implementation methods. For those skilled in the art, other different forms of changes or modifications can be made based on the above description. It is not necessary and impossible to list all the implementation methods here. The obvious changes or modifications derived therefrom are still within the scope of protection of the invention.

Claims

1. A wind power generation system, comprising: A transmission mechanism (1), a generator (2), a compressor (3), an expander (4) and a gas storage tank (5); The transmission mechanism (1) comprises a first transmission shaft (6), a second transmission shaft (7), a third transmission shaft (8) and a fourth transmission shaft (9) which are rotatably arranged, the first transmission shaft (6) being sleeved with a first gear, the second transmission shaft (7) being sleeved with a second gear, the third transmission shaft (8) being sleeved with a third gear, and the fourth transmission shaft (9) being sleeved with a fourth gear, the second gear, the third gear and the fourth gear all being meshed with the outer teeth of the first gear; The first transmission shaft (6) is coaxially connected to the wind turbine hub (16), the second transmission shaft (7) is coaxially connected to the input shaft of the generator (2), the third transmission shaft (8) is coaxially connected to the main shaft of the compressor (3), and the fourth transmission shaft (9) is coaxially connected to the main shaft of the expander (4); The energy storage port of the gas storage tank (5) is in communication with the exhaust port of the compressor (3), and the energy release port of the gas storage tank (5) is in communication with the air inlet of the expander (4); The invention is characterized in that a first clutch (10) is provided at the connection between the main shaft of the compressor (3) and the third transmission shaft (8), a second clutch (11) is provided at the connection between the main shaft of the expander (4) and the fourth transmission shaft (9), and a control module controls the first clutch (10) and the second clutch (11) to work at different times; It also includes a brake assembly arranged in the wind turbine cabin (17), the brake assembly having a brake member suitable for limiting the rotation of the first transmission shaft (6), the brake assembly being connected to the control module by signal; the brake assembly includes: A rotating wheel (12) is fixedly sleeved on the first transmission shaft (6), and the rotating wheel (12) has a plurality of first electromagnets arranged at intervals in the circumferential direction; A second electromagnet is connected in the wind turbine cabin (17) and is suitable for performing adsorption braking with the first electromagnet of the rotor (12); A wind sensor (14) is installed on the top of the wind turbine cabin (17), and the wind sensor (14) is connected to the control module by signal. The energy storage port and the energy release port of the gas storage tank (5) are both connected to a flow regulating valve (15), and the flow regulating valve (15) is signal-connected to the control module; When the energy provided by the external wind force is not much different from the load demand, the first clutch (10) and the second clutch (11) are both disconnected, the main shaft of the compressor (3) is disconnected from the third transmission shaft (8), and the main shaft of the expander (4) is disconnected from the fourth transmission shaft (9); the wind turbine hub (16) rotates, and after being accelerated by the transmission mechanism (1), it drives the input shaft of the generator (2) to operate and generate electricity; When the energy provided by the external wind force exceeds the load requirement, the first clutch (10) is closed, the second clutch (11) is disconnected, the main shaft of the compressor (3) is connected to the third transmission shaft (8), and the main shaft of the expander (4) is disconnected from the fourth transmission shaft (9); the wind turbine hub (16) rotates, and a part of the wind energy is transmitted to the main shaft of the compressor (3) through the transmission mechanism (1), and the compressor (3) operates to compress, and the air inlet of the compressor (3) inhales air, and the air is pressurized and stored in the air storage tank (5) from the exhaust port of the compressor (3); another part of the wind energy is transmitted to the input shaft of the generator (2) through the transmission mechanism (1), and the generator operates to generate electricity; When the energy provided by the external wind force cannot meet the load demand, the first clutch (10) is disconnected, the second clutch (11) is closed, the main shaft of the compressor (3) is disconnected from the third transmission shaft (8), and the main shaft of the expander (4) is connected to the fourth transmission shaft (9); the wind turbine hub (16) rotates, and all wind energy is transmitted to the input shaft of the generator (2) through the transmission mechanism (1), and the operation generates electricity; at the same time, the flow control valve (15) between the air inlet of the expander (4) and the gas storage tank (5) is opened, and the high-pressure gas in the gas storage tank (5) drives the main shaft of the expander (4) to rotate, and the main shaft of the expander (4) transmits energy to the input shaft of the generator (2) through the transmission mechanism (1), and the operation generates electricity; When the energy provided by the external wind force far exceeds the load demand and is beyond the control range of the system, the control module controls the braking component to brake the first transmission shaft (6), and the wind power generation system stops generating electricity.

2. The wind power generation system according to claim 1, characterized in that: The first transmission shaft (6) is sleeved with a support bearing, and the support bearing is fixed in the wind turbine cabin (17) via a bearing seat (13).

3. The wind power generation system according to claim 1, characterized in that: The gas storage tank (5) is located in the bottom base (18) of the tower (19), and the gas pipes on the compressor (3) / expander (4) are all accommodated in the tower (19).

4. The wind power generation system according to claim 1, characterized in that: The air inlet of the compressor (3) and the exhaust port of the expander (4) are both connected to the atmosphere.

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