A wind turbine with multi-stage pitch adjustment and control method

Abstract

The present invention provides a wind turbine with multi-stage pitch adjustment and a control method, comprising a deflectable blade pitch adjustment structure, a brake device, a telescopic pitch adjustment structure, a liftable platform, a control system, a generator, and a wind turbine base. The wind turbine base is mounted on the liftable platform, and the generator, brake device, and wind turbine main mast are mounted on the wind turbine base and connected in sequence. The wind turbine main mast is vertically rotatably connected to the wind turbine base. The wind turbine main mast and wind turbine blades are connected by a telescopic pitch adjustment structure. The wind turbine blades are provided with inclination sensors, and the inclination sensor signals are connected to the telescopic pitch adjustment structure. The deflectable blade pitch adjustment structure is mounted on the wind turbine blades. This improves the portability of the wind turbine during transportation and the flexibility of wind turbine pitch adjustment.

Description

Technical Field

[0001] The present invention relates to the technical field of wind turbines, and in particular to a wind turbine with multi-stage pitch adjustment and a control method thereof. Background Art

[0002] Vertical axis wind turbines have the advantages of smaller size, higher installation flexibility and lower noise.

[0003] Power outages and unstable electricity supply are common in mountainous areas and rural areas, causing a lot of inconvenience to residents in these areas, and larger power generation equipment is difficult to transport and build.

[0004] However, there are the following problems in the use of vertical axis wind turbines:

[0005] 1. The lack of a variable pitch structure means that the wind turbine's rotation state cannot adapt to changing wind conditions, resulting in low wind energy utilization, or the variable pitch structure is relatively simple and lacks an intelligent adjustment system.

[0006] 2. The lack of a brake structure means that the fan cannot be braked in an emergency when rotating at high speed, and there is a risk of damage to the fan in a strong wind environment.

[0007] 3. Due to the lack of protective devices, the fan has poor working stability in bad weather. Summary of the Invention

[0008] The technical problems to be solved by the present invention are: the lack of intelligently controlled variable pitch structure and brake structure and the inconvenience in transporting the wind turbine.

[0009] In order to solve the above technical problems, the technical solution adopted by the present invention is: a wind turbine with multi-stage adjustable pitch, comprising a deflectable blade pitch structure, a brake device, a telescopic pitch structure, a liftable platform, a control system, a generator and a wind turbine base;

[0010] The wind turbine base is installed on a liftable platform. The generator, brake device and wind turbine main pole are installed on the wind turbine base and connected in sequence. The wind turbine main pole is vertically rotated and connected to the wind turbine base. The wind turbine main pole and the wind turbine blades are connected by a telescopic pitch structure. An inclination sensor is provided in the wind turbine blades, and the inclination sensor signal is connected to the telescopic pitch structure. The deflectable blade pitch structure is installed on the wind turbine blades.

[0011] Preferably, the telescopic variable pitch structure includes a first telescopic ring and a second telescopic ring which are arranged in pairs on the main rod of the fan, the first telescopic ring is slidably arranged, and the second telescopic ring is fixedly arranged, the outer wall of the first telescopic ring is hinged with a long connecting rod, the outer wall of the second telescopic ring is fixedly connected with a short connecting rod, the movable end of the short connecting rod is hinged with a support plate for the long connecting rod to pass through, two groups of first telescopic rings and second telescopic rings are arranged on the main rod of the fan, the two long connecting rods are respectively hinged to the two ends of the fan blades, and the main rod of the fan is provided with a driving member for driving the first telescopic ring to slide axially.

[0012] Preferably, the driving member includes a push rod motor arranged parallel to the fan main rod and a lifting motor arranged on the first telescopic ring, the output end of the push rod motor is fixedly connected to the first telescopic ring at the bottom, the lifting motor is installed on the first telescopic ring at the top, a lifting gear is provided on the output shaft of the lifting motor, a rack meshing with the lifting gear is provided on the outer wall of the fan main rod, and the inclination sensor controls the connection to the lifting motor.

[0013] Preferably, the fan blade includes an auxiliary blade and a main blade vertically connected to one end of the auxiliary blade, the auxiliary blade is connected to the telescopic variable pitch structure, the deflectable fan blade variable pitch structure is connected between the main blade and the auxiliary blade, and the driving end of the deflectable fan blade variable pitch structure is connected to the mounting shaft of the main blade.

[0014] Preferably, the outer wall of the main blade is covered with a thermal insulation coating, and an inflatable airbag, a gas heating tube and a small gas compressor connected in sequence are fixedly installed inside the main blade. The side wall of the inflatable airbag is bonded to the inner wall of the main blade, and an opening connected to the interior of the inflatable airbag is opened on the main blade. The air inlet end of the small gas compressor is located outside the main blade.

[0015] Preferably, the bottom end of the fan main rod is fixedly connected to a driving gear, a transmission rod is vertically rotatably provided in the fan base, a driven gear meshing with the driving gear is fixedly connected to the transmission rod, the transmission rod is transmission-connected to the input shaft of the generator, and the number of teeth of the driven gear is smaller than that of the driving gear.

[0016] Preferably, the brake device is connected to the bottom end of the transmission rod, and the brake device includes a bearing fixing cover, a brake stator, an electromagnetic coil, a brake disc, a brake disc and a flange disc arranged on the fan base from bottom to top, a positioning pin is connected between the flange disc and the brake stator, a fixing screw is connected between the brake stator and the bearing fixing cover, the inner ring of the brake stator is provided with a bearing connected to the transmission rod, the brake disc is fixedly connected to the transmission rod, a pressure spring is provided between the brake disc and the brake stator, and a gap is provided between the brake disc and the brake disc.

[0017] Preferably, the liftable platform includes a support plate and a telescopic column vertically connected to the bottom of the support plate, the telescopic column includes a top column and a bottom column, and the bottom column is provided with a lifting buckle for locking the top column.

[0018] A control method for a wind turbine with multi-stage pitch adjustment, wherein the wind turbine pitch adjustment comprises the following steps:

[0019] S1. The push rod motor pushes the first telescopic ring at the bottom to move upward, which drives the long connecting rod to move upward. During the upward movement, the long connecting rod passes through the support plate and pushes the bottom end of the fan blade to move toward the outside of the fan, causing the fan blade to tilt inward.

[0020] S2. After the inclination sensor inside the fan blade detects that the fan blade is tilted inward, the lifting motor on the first telescopic ring at the top drives the lifting gear to rotate, and the lifting gear drives the first telescopic ring to move downward, and the first telescopic ring drives the long connecting rod to move downward. During the downward movement, the long connecting rod passes through the support plate and pushes the top end of the fan blade to move toward the outside of the fan, so that the fan is in a vertical state.

[0021] Preferably, the wind turbine pitch control can also drive the end of the main blade to rotate vertically around the end of the secondary blade through the motor in the deflectable fan blade pitch control structure.

[0022] The present invention provides a wind turbine with multi-stage pitch adjustment and a control method, which has the following technical effects:

[0023] 1. By setting up a deflectable fan blade pitch structure and a telescopic variable pitch structure, the pitch of the wind turbine blades can be adjusted to the greatest extent. When the wind turbine is working, the blades can be fully unfolded to ensure efficient power generation of the wind turbine. When transporting the wind turbine, the blades can be effectively stored to facilitate the transportation of the wind turbine.

[0024] 2. A brake device is connected to the main pole of the wind turbine. When the speed of the wind turbine is too high, the main pole of the wind turbine is locked and the main pole of the wind turbine is shut down, ensuring the safe operation of the generator inside the wind turbine in a strong wind environment.

[0025] 3. When adjusting the pitch of the wind turbine, the angle of the wind turbine blades can be adjusted through the inclination sensor in conjunction with the lifting motor to maintain the vertical state of the wind turbine blades and ensure the safety of the wind turbine operation.

[0026] 4. The deflectable fan blade and pitch structure can adjust the structure of the wind turbine blades, making it easier to store the wind turbine. At the same time, it can adjust the force-bearing area of ​​the wind turbine and adjust the power generation. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] The present invention will be further described below with reference to the accompanying drawings and examples:

[0028] Figure 1 This is the main view of the technical solution of this application.

[0029] Figure 2 This is a three-dimensional diagram of the technical solution of this application.

[0030] Figure 3 This is a top view of the technical solution of this application.

[0031] Figure 4 This is a cross-sectional view of the main fan blade in the technical solution of this application.

[0032] Figure 5 This is a schematic diagram of the internal structure of the fan in the technical solution of this application.

[0033] Figure 6 This is a schematic diagram of the structure of the brake device in the technical solution of this application.

[0034] Figure 7 This is a schematic diagram of the variable pitch structure in the technical solution of this application (the first telescopic ring is raised).

[0035] Figure 8 This is a schematic diagram of the variable pitch structure in the technical solution of this application (the first telescopic ring falls).

[0036] Figure 9 This is a schematic diagram of the variable pitch structure in the technical solution of this application (main blades downwind).

[0037] Figure 10 This is a schematic diagram of the variable pitch structure in the technical solution of this application (main blades facing upwind).

[0038] Figure 11 This is a schematic diagram of the lifting platform in the technical solution of this application.

[0039] In the figure: 1. Fan base; 2. Fan casing; 3. First telescopic ring; 4. Second telescopic ring; 5. Short connecting rod; 6. Push rod motor; 7. Bottom fixer; 8. Support plate; 9. Long connecting rod; 10. Fan main rod; 11. Auxiliary blades; 12. Main blades; 13. Base threaded hole; 14. Inflatable airbag; 15. Driven gear; 16. Transmission rod; 17. Brake device; 18. Brake device protective cover; 19. Generator protective cover; 20. Driving gear; 21. Gear protective cover; 22. Control center; 23. Flange; 24. Locating pin; 25. Brake stator; 26. Bearing fixing cover; 27. Bearing; 28. Fixing screw; 29. ​​Electromagnetic coil; 30. Pressure spring; 31. Brake disc; 32. Brake disc; 33. Lifting buckle. DETAILED DESCRIPTION

[0040] like Figure 1-11 The present invention provides a wind turbine with multi-stage pitch adjustment, comprising a deflectable blade pitch adjustment structure, a brake device 17, a telescopic pitch adjustment structure, a liftable platform, a control system, a generator and a wind turbine base 1;

[0041] The wind turbine base 1 is installed on a liftable platform. The generator, brake device 17 and wind turbine main pole 10 are installed on the wind turbine base 1 and connected in sequence. The wind turbine main pole 10 is vertically rotatably connected to the wind turbine base 1. The wind turbine main pole 10 and the wind turbine blades are connected through a telescopic pitch structure. An inclination sensor is provided in the wind turbine blade, and the inclination sensor signal is connected to the telescopic pitch structure. The deflectable blade pitch structure is installed on the wind turbine blade.

[0042] The deflectable fan blade pitch structure is used to control the rotational speed. Its blades are airfoil-shaped, which helps reduce resistance. The blades are made of fiberglass, which utilizes its good thermal insulation, anti-magnetic and insulation properties. Its excellent thermal insulation properties prevent the blades from cooling down rapidly in cold weather and assist in removing thick ice layers. Its insulation and anti-magnetic properties ensure the stability of the electromagnetic field inside the generator.

[0043] The brake device 17 primarily utilizes an electromagnetic brake. When the blade speed exceeds the maximum limit, stall damage may occur. At this point, the brake device is activated to stop the fan. The electromagnetic brake has a fast response time, is compact, has high torque, and has a long service life and a low failure rate. A brake device protective cover 18 is also installed on the outside of the brake device 17 to protect it.

[0044] The telescopic variable pitch structure adopts a design similar to the shape of an umbrella frame. The material is 304 stainless steel, which is corrosion-resistant and has high structural strength. It can support the blades and adopts a two-way gathering form to shorten the movement distance, reduce the machine failure rate, and increase the overall stability.

[0045] A control center 22 is installed on the wind turbine base 1. The control center 22 is connected to the sensors on the wind turbine and controls the deflectable blade pitch structure, the telescopic pitch structure and the brake device 17.

[0046] The liftable platform is made of low-alloy high-strength structural steel, such as Q420E. Its four supporting bases are equipped with movable buckles, which can adjust the height of each pole separately, so that it can better adapt to various terrains and situations.

[0047] The control system is arranged in the control center 22 and is used to control some changes of the wind turbine generator to ensure the safety and reliability of the generator.

[0048] The control system includes an emergency stop control system, a variable pitch control system and a UPS power supply. The emergency stop control system can control the electromagnetic brake device 17 and the motor to stop the fan. The variable pitch control system can issue commands to turn and retract the fan blades according to the signals transmitted by the wind force sensor and the wind direction sensor. When the wind speed is low, it can deflect the fan blades to make them better receive the wind. When the wind speed is high, the fan blades are turned away from the wind direction to assist braking.

[0049] The UPS power supply is used to ensure the power supply of the unit control system, emergency protection system and related execution units in the event of a power outage of the external power supply.

[0050] The generator adopts a three-phase squirrel cage generator, whose input shaft is connected to the wind turbine main rod 10, and the transmission structure is provided with a gear set, which increases the speed of the generator input shaft through the gear transmission ratio.

[0051] A fan casing 2 is provided on the outside of the fan base 1 to protect the components inside the fan base 1. The fan casing 2 is made of high-strength organic material and has strong toughness to avoid breakage due to thermal expansion and contraction of the material itself caused by sudden changes in temperature. At the same time, it has good insulation properties to avoid causing significant interference to the electromagnetic field of the internal generator.

[0052] like Figure 1-3 The telescopic pitch structure includes a first telescopic ring 3 and a second telescopic ring 4, which are arranged in pairs on the main rod 10 of the wind turbine. The first telescopic ring 3 is slidably arranged, and the second telescopic ring 4 is fixedly arranged. A long connecting rod 9 is hingedly connected to the outer wall of the first telescopic ring 3, and a short connecting rod 5 is fixedly connected to the outer wall of the second telescopic ring 4. The movable end of the short connecting rod 5 is hingedly connected to a support plate 8 for the long connecting rod 9 to pass through. Two groups of first telescopic rings 3 and second telescopic rings 4 are provided on the main rod 10 of the wind turbine. Two long connecting rods 9 are respectively hinged to the two ends of the wind turbine blades. The main rod 10 of the wind turbine is provided with a driving member that drives the first telescopic ring 3 to slide axially.

[0053] Two sets of first telescopic rings 3 and second telescopic rings 4 are installed on the main rod 10 of the fan, wherein the first telescopic ring 3 is a movable ring and the second telescopic ring 4 is a fixed ring. The short connecting rod 5 on the second telescopic ring 4 is also fixedly welded to the second telescopic ring 4. The support plate 8 is a hollow structure plate body. The outer wall of the support plate 8 is provided with a through opening, and the long connecting rod 9 passes through the opening. The support plate 8 can always provide support for the long connecting rod 9 during the rotation of the long connecting rod 9.

[0054] like Figure 2The driving member includes a push rod motor 6 arranged parallel to the fan main rod 10 and a lifting motor arranged on the first telescopic ring 3. The output end of the push rod motor 6 is fixedly connected to the first telescopic ring 3 at the bottom, and the lifting motor is installed on the first telescopic ring 3 at the top. The output shaft of the lifting motor is provided with a lifting gear. A rack meshing with the lifting gear is provided on the outer wall of the fan main rod 10. The tilt sensor is controlled and connected to the lifting motor.

[0055] A bottom fixer 7 is fixedly connected to the middle of the fan main rod 10 , and the bottom fixer 7 is used for fixing and installing the push rod motor 6 .

[0056] A groove is formed on the outer side wall of the fan main rod 10 , and the rack is fixedly installed in the groove of the fan main rod 10 .

[0057] like Figure 9 and Figure 10 The fan blades include auxiliary blades 11 and main blades 12 vertically connected to one end of the auxiliary blades 11. The auxiliary blades 11 are connected to the telescopic pitch structure. The deflectable fan blade pitch structure is connected between the main blades 12 and the auxiliary blades 11. The driving end of the deflectable fan blade pitch structure is transmission-connected to the mounting shaft of the main blades 12.

[0058] The deflectable fan blade pitch structure is arranged between the main blade 12 and the auxiliary blade 11. By adjusting the angle between the main blade 12 and the auxiliary blade 11, the wind receiving area of ​​the fan blade is adjusted.

[0059] like Figure 4 The outer wall of the main blade 12 is covered with a heat-insulating coating. An inflatable airbag 14, a gas heating pipe, and a small gas compressor are fixedly installed in the main blade 12, which are connected in sequence. The side wall of the inflatable airbag 14 is bonded to the inner wall of the main blade 12. The main blade 12 is provided with an opening that communicates with the interior of the inflatable airbag 14. The air inlet of the small gas compressor is located outside the main blade 12.

[0060] Pressurized air is delivered to the gas heating pipe by a small gas compressor. After entering the gas heating pipe, the air is heated by the electric heating structure and enters the inflatable airbag 14. The inflatable airbag 14 expands and fits fully with the inner wall of the main blade 12. The gas in the inflatable airbag 14 discharges the hot air through the through hole between it and the outer wall of the main blade 12, thereby removing the thin ice on the surface, and together with the thermal insulation coating on the main blade 12, achieves the anti-icing and de-icing effect.

[0061] like Figure 5The bottom end of the wind turbine main rod 10 is fixedly connected to a driving gear 20. A transmission rod 16 is vertically rotatably provided in the wind turbine base 1. A driven gear 15 is fixedly connected to the transmission rod 16 and meshes with the driving gear 20. The transmission rod 16 is in driving connection with the input shaft of the generator. The number of teeth on the driven gear 15 is smaller than that on the driving gear 20.

[0062] The wind turbine main rod 10 drives the driven gear 15 to rotate through the driving gear 20, and the driven gear 15 drives the transmission rod 16 to rotate. The transmission rod 16 further transmits the torque to the input shaft of the generator. The number of teeth of the driving gear 20 is greater than that of the driven gear 15, which increases the rotation speed of the transmission rod 16.

[0063] A gear protection cover 21 is sleeved on the outer sides of the gear driving gear 20 and the driven gear 15.

[0064] A generator protection cover 19 is installed at the bottom of the wind turbine base 1 .

[0065] like Figure 6 The brake device 17 is connected to the bottom end of the transmission rod 16 and includes, from bottom to top, a bearing fixing cover 26, a brake stator 25, an electromagnetic coil 29, a brake disc 31, a brake disc 32, and a flange 23, which are sequentially arranged on the fan base 1. A positioning pin 24 is connected between the flange 23 and the brake stator 25. A fixing screw 28 is connected between the brake stator 25 and the bearing fixing cover 26. A bearing 27 connected to the transmission rod 16 is provided on the inner ring of the brake stator 25. The brake disc 32 is fixedly connected to the transmission rod 16. A pressure spring 30 is provided between the brake disc 31 and the brake stator 25. A gap is provided between the brake disc 31 and the brake disc 32.

[0066] The edge of the fan base 1 is provided with a base threaded hole 13 for connecting to the liftable platform.

[0067] The brake stator 25 is fixedly connected to the bearing fixing cover 26. The brake stator 25 and the flange 23 are connected and form an installation space for the brake disc 32 in the middle. The brake disc 32 is fixedly connected to the transmission rod 16. During startup or power generation, current is passed through the electromagnetic coil 29. The electromagnetic coil 29 attracts the brake disc 31 through magnetic force. The brake disc 31 compresses the pressure spring 30 installed in the brake stator 25, and the brake disc 31 is separated from the brake disc 32. When the transmission rod 16 needs to be decelerated or locked, the power supply of the electromagnetic coil 29 is disconnected, and the brake disc 31 is pushed into contact with the brake disc 32 by the pressure spring 30, and the rotation speed of the brake disc 32 is reduced by friction, thereby achieving the deceleration or locking of the transmission rod 16.

[0068] like Figure 11As shown, in order to facilitate the adjustment of the height of the lifting platform and the length of each support column to adapt to different terrains, the lifting platform includes a support plate and a telescopic column vertically connected to the bottom of the support plate. The telescopic column includes a top column and a bottom column. The bottom column is provided with a lifting buckle 33 for locking the top column.

[0069] A control method for a wind turbine with multi-stage pitch adjustment, wherein the wind turbine pitch adjustment comprises the following steps:

[0070] S1. The push rod motor 6 pushes the first telescopic ring 3 at the bottom to move upward, and the first telescopic ring 3 drives the long connecting rod 9 to move upward. During the upward movement, the long connecting rod 9 passes through the support plate 8 and pushes the bottom end of the fan blade to move toward the outside of the fan, causing the fan blade to tilt inward;

[0071] S2. After the inclination sensor inside the fan blade detects that the fan blade is tilted inward, the lifting motor on the first telescopic ring 3 at the top drives the lifting gear to rotate, and the lifting gear drives the first telescopic ring 3 to move downward, and the first telescopic ring 3 drives the long connecting rod 9 to move downward. During the downward movement, the long connecting rod 9 passes through the support plate 8 and pushes the top end of the fan blade to move toward the outside of the fan, so that the fan forms a vertical state.

[0072] The wind turbine pitch control can also drive the end of the main blade 12 to rotate vertically around the end of the secondary blade 11 through the motor in the deflectable fan blade pitch control structure.

Claims

1. A wind turbine with multi-stage pitch adjustment, characterized in that: It includes a deflectable fan blade pitch structure, a brake device (17), a telescopic pitch structure, a liftable platform, a control system, a generator and a fan base (1); The fan base (1) is installed on a liftable platform, and a generator, a brake device (17) and a fan main rod (10) are installed on the fan base (1) and connected in sequence. The fan main rod (10) is vertically rotatably connected to the fan base (1). The fan main rod (10) and the fan blades are connected via a telescopic pitch structure. An inclination sensor is provided in the fan blades, and a signal of the inclination sensor is connected to the telescopic pitch structure. The deflectable fan blade pitch structure is installed on the fan blades. The telescopic pitch structure comprises a first telescopic ring (3) and a second telescopic ring (4) which are sleeved in pairs on the main rod (10) of the wind turbine. The first telescopic ring (3) is slidably arranged, and the second telescopic ring (4) is fixedly arranged. The outer wall of the first telescopic ring (3) is hinged with a long connecting rod (9), and the outer wall of the second telescopic ring (4) is fixedly connected with a short connecting rod (5). The movable end of the short connecting rod (5) is hinged with a support plate (8) for the long connecting rod (9) to pass through. Two groups of the first telescopic ring (3) and the second telescopic ring (4) are provided on the main rod (10). The two long connecting rods (9) are hinged with the two ends of the fan blades respectively. The main rod (10) of the wind turbine is provided with a driving member for driving the first telescopic ring (3) to slide axially. The driving member comprises a push rod motor (6) arranged parallel to the fan main rod (10) and a lifting motor arranged on the first telescopic ring (3); the output end of the push rod motor (6) is fixedly connected to the first telescopic ring (3) located at the bottom; the lifting motor is installed on the first telescopic ring (3) located at the top; a lifting gear is arranged on the output shaft of the lifting motor; a rack meshing with the lifting gear is arranged on the outer wall of the fan main rod (10); and the tilt sensor is controlled and connected to the lifting motor; The fan blade comprises an auxiliary blade (11) and a main blade (12) vertically rotatably connected to one end of the auxiliary blade (11), the auxiliary blade (11) being connected to the telescopic variable pitch structure, the deflectable fan blade variable pitch structure being connected between the main blade (12) and the auxiliary blade (11), and the driving end of the deflectable fan blade variable pitch structure being transmission-connected to the mounting shaft of the main blade (12); The outer wall of the main blade (12) is covered with a heat-insulating coating, and an inflatable airbag (14), a gas heating pipe and a small gas compressor connected in sequence are fixedly arranged inside the main blade (12), and the side wall of the inflatable airbag (14) is bonded to the inner wall of the main blade (12). An opening communicating with the interior of the inflatable airbag (14) is opened on the main blade (12), and an air inlet end of the small gas compressor is located outside the main blade (12).

2. A wind turbine with multi-stage pitch adjustment according to claim 1, characterized in that: The bottom end of the fan main rod (10) is fixedly connected to a driving gear (20), a transmission rod (16) is vertically rotatably provided in the fan base (1), a driven gear (15) meshing with the driving gear (20) is fixedly connected to the transmission rod (16), the transmission rod (16) is drivingly connected to the input shaft of the generator, and the number of teeth of the driven gear (15) is smaller than the number of teeth of the driving gear (20).

3. The wind turbine with multi-stage pitch adjustment according to claim 1, characterized in that: The liftable platform comprises a support plate and a telescopic column vertically connected to the bottom of the support plate, the telescopic column comprises a top column and a bottom column, and a lifting buckle (33) for locking the top column is provided on the bottom column.

4. The control method of a wind turbine with multi-stage pitch adjustment according to claim 1, characterized in that: The wind turbine pitch control process includes the following steps: S1. The first telescopic ring (3) at the bottom is pushed upward by the push rod motor (6), and the first telescopic ring (3) drives the long connecting rod (9) to move upward. During the upward movement, the long connecting rod (9) passes through the support plate (8) and pushes the bottom end of the fan blade to move toward the outside of the fan, so that the fan blade tilts inward; S2. After the inclination sensor in the fan blade detects that the fan blade is tilted inward, the lifting motor on the first telescopic ring (3) at the top drives the lifting gear to rotate, and the lifting gear drives the first telescopic ring (3) to move downward, and the first telescopic ring (3) drives the long connecting rod (9) to move downward. During the downward movement, the long connecting rod (9) passes through the support plate (8) and pushes the top of the fan blade to move toward the outside of the fan, so that the fan forms a vertical state.

5. The control method of a wind turbine with multi-stage pitch adjustment according to claim 4, characterized in that: The wind turbine pitch control can also drive the end of the main blade (12) to rotate vertically around the end of the auxiliary blade (11) through the motor in the deflectable fan blade pitch control structure.

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