Wind turbine wind vane calibration device and calibration method

Abstract

Disclosed in the present invention are a wind turbine wind vane calibration device and calibration method. The wind turbine wind vane calibration device comprises a clamping member, a support, a rotating member, range finders and a positioning member; the clamping member is mounted at the lower end of the support, and the clamping member is used for being fixedly mounted on a fixed column; the rotating member is mounted at the upper end of the support; the two range finders are mounted on the rotating member, and the two range finders are arranged at an angle to each other and are symmetrically mounted with respect to a central axis; the positioning member is mounted on the rotating member and located above the clamping member, and the positioning member is used for connecting to and supporting the lower end of a wind vane. Further comprised is a calibration structure for calibrating the wind vane, wherein the wind vane is provided with a reference mark, and, by means of the reference mark, the calibration structure positions the wind vane in the circumferential direction. The present invention enables convenient and quick calibration of a wind vane without calibrating a nacelle centerline.

Description

A wind vane calibration device and calibration method for wind turbine generator sets Technical Field

[0001] This invention relates to the field of wind turbine installation technology, and in particular to a wind turbine wind vane calibration device and its calibration method. Background Technology

[0002] The problem of wind vane misalignment is a common phenomenon in the wind power industry. Traditional installation methods are limited to the intuitive perception of personnel to align the direction of the zero mark of the wind vane with the direction of the turbine head. Due to differences in individual perception, the correction error occurs, resulting in a deviation in the direction of the wind vane and the turbine head. This leads to inaccurate alignment of the turbine with the wind, yaw deviation, reduced wind energy captured by the turbine, and thus affects the power generation of the wind turbine, which significantly impacts the economic benefits of the wind farm.

[0003] Currently, some technicians have proposed solutions. For example, Chinese patent document CN108303005B, published on July 21, 2023, discloses a zero-position error detection and calibration device for a wind turbine wind vane. The detection and calibration device includes a switch, an aluminum alloy shell, a zero-position pointer, a dial, a scale pointer, a horizontal knob, a vertical knob, a pressure plate, a battery, a laser generator, a total reflection prism, and a base plate. The switch, dial, and base plate are fixedly mounted on the aluminum alloy shell. The zero-position pointer can slide along the pointer direction on the aluminum alloy shell. The scale pointer is fixedly mounted on the horizontal knob. The horizontal knob can rotate horizontally around the axis of the dial. The vertical knob is mounted on the horizontal knob at the same height as the laser generator and can rotate vertically relative to the horizontal knob. The total reflection prism is fixed on the vertical knob. Its advantages are: precise detection, enabling accurate wind turbine alignment and improving power generation efficiency; its disadvantages are: firstly, the nacelle centerline is a theoretical line, and in actual operation, there is an anemometer on one side of the wind vane, and the wind vane is not directly in the center of the nacelle top, making it difficult to accurately determine the nacelle centerline; secondly, obtaining the reference point using an inaccurate nacelle centerline also results in significant errors. Therefore, this device is cumbersome and inconvenient to use in practice.

[0004] In addition, Chinese patent document CN213016640U, published on April 20, 2021, discloses a wind vane alignment device for wind turbine generator sets. Although a laser rangefinder is disclosed, it is still necessary to find the centerline of the turbine head and make the laser line coincide with the parallel line of the centerline of the turbine head. Since the centerline of the turbine head is not easy to calibrate, it is inconvenient to use. Summary of the Invention

[0005] To address the existing technical problems, the main objective of this invention is to provide a wind vane calibration device and calibration method for wind turbine generator sets, which can conveniently and quickly calibrate the wind vane without calibrating the centerline of the nacelle.

[0006] To overcome the problems existing in the prior art, the technical solution adopted in this invention is: a wind turbine wind vane calibration device, including a clamping component, a bracket, a rotating component, a rangefinder, and a positioning component. The clamping component is installed at the lower end of the bracket and is used to fix it to a fixed column. The rotating component is installed at the upper end of the bracket, and two rangefinders are installed on the rotating component. The two rangefinders are installed at an angle to each other and symmetrically with respect to the central axis. The positioning component is installed on the rotating component above the clamping component and is used to connect and support the lower end of the wind vane. The device also includes a correction structure for calibrating the wind vane. A reference mark is set on the wind vane, and the correction structure positions the circumferential position of the wind vane through the reference mark.

[0007] The rotating component is a box structure. The lower side of the box structure is rotatably connected to the support shaft of the bracket through a bearing. The rangefinder is installed on one side inside the box structure. The box structure has a window at the position corresponding to the rangefinder.

[0008] The rotating component rotates via a drive assembly. A controller is also installed inside the housing structure. The controller is electrically connected to the rangefinder and the drive assembly. The controller is powered by a built-in battery or an external power source.

[0009] The drive assembly includes a worm gear, a first worm, and a first motor. The drive assembly is located inside the housing structure. The upper end of the support shaft extends into the housing structure. The worm gear is fixedly mounted on the support shaft. Both ends of the first worm are connected to the housing structure through bearing seats. The output shaft of the first motor is connected to one end of the first worm for transmission.

[0010] The positioning component is a ring structure, with the lower end of the wind vane inserted into the ring structure and the lower end of the wind vane fitting with the ring structure with a clearance fit; the correction structure is a reference mark line set on the positioning component, and the reference mark line and the central axis are located in the same vertical plane.

[0011] The correction structure includes a laser sensor, and there is one laser sensor. A support is mounted on the rotating part, and the laser sensor is mounted on the support. The laser beam of the laser sensor is located on the same vertical plane as the central axis. The reference mark is a longitudinally arranged reflective mark. The laser sensor is electrically connected to the controller.

[0012] The positioning component is a ring structure, with the lower end of the wind vane connected to a limiting ring structure. The positioning component is connected to the rotating component via a connector. The outer wall of the positioning component has a worm gear tooth structure, and the upper and lower end faces of the positioning component are respectively provided with arc-shaped grooves. The connector has a groove-shaped structure, and the ends of the groove walls on both sides of the connector are respectively provided with inwardly extending arc-shaped portions. The arc-shaped portions on the upper and lower sides are respectively slidably fitted into the arc-shaped grooves on the upper and lower end faces of the positioning component. A second worm gear is installed inside the connector, and a second motor is installed on one side of the connector. The output shaft of the second motor is connected to the second worm gear for transmission. The second motor is electrically connected to the controller.

[0013] The positioning component includes a first half-ring and a second half-ring. The first half-ring is connected to the rotating component, and the second half-ring is installed on the first half-ring by screws. The upper and lower end faces of the first half-ring are respectively provided with arc-shaped grooves. The arc-shaped parts on the upper and lower sides of the connector are slidably fitted into the arc-shaped grooves on the upper and lower end faces of the first half-ring.

[0014] An adjusting seat is installed on the rotating component. The adjusting seat is coaxial with the support shaft. A transverse hole is provided on the adjusting seat. An extension rod is fixed to the positioning component. The extension rod passes through the transverse hole of the adjusting seat. A limit bolt is screwed onto the adjusting seat. The limit bolt abuts against the extension rod to limit the extension rod.

[0015] A method for calibrating a wind vane for a wind turbine generator set, employing the aforementioned wind vane calibration device, includes the following steps:

[0016] S1. Install a fixing column on the top of the wind turbine nacelle, and install the calibration device onto the fixing column using the clamping device. During installation, initially align the calibration device with the step surface of the nacelle, and then put the connecting sleeve onto the fixing column.

[0017] S2. Install the lower end of the wind vane onto the positioning component;

[0018] S3. Start the controller. The beams of the two rangefinders shine on the step surface respectively. The controller reads the distance values ​​detected by the two rangefinders in real time and controls the first motor to start, causing the rotating part to swing left and right. If the distance values ​​detected by the two rangefinders are different, the rotating part swings towards the rangefinder with the smaller value until the distance values ​​detected by the two rangefinders are within the set range. Then the controller controls the first motor to stop.

[0019] S4. Then, the controller controls the second motor and the laser sensor to start. The positioning component rotates left and right under the drive of the second motor, thereby causing the wind vane to rotate left and right. The laser sensor detects the position of the reference mark on the wind vane in real time based on the amount of laser reflection received. When the reference mark is aligned with the laser sensor, the amount of laser received by the laser sensor reaches the set value. At this time, the controller controls the second motor to stop.

[0020] S5. Move the connecting sleeve upwards, simultaneously covering the lower end of the fixed column and the wind vane. First, connect and fix the connecting sleeve to the fixed column with bolts, and then connect and fix the lower end of the wind vane to the connecting sleeve with bolts. Among them, two layers of bolts are installed on the upper side of the connecting sleeve to connect with the lower end of the wind vane. When installing the bolts on the upper side of the connecting sleeve, first symmetrically tighten the bolts by hand to abut against the lower end of the wind vane, and then symmetrically tighten them with tools in multiple steps.

[0021] The present invention has the following beneficial effects:

[0022] 1. The rangefinder of this invention is used to measure the distance to the stepped surface of the cabin. By swinging the rotating component left and right, when the distance values ​​displayed by the two rangefinders are the same, it indicates that the centerline is perpendicular to the stepped surface, and at this time, the centerline is parallel to the centerline of the cabin. The wind vane has a reference mark. By rotating and adjusting the wind vane, the reference mark is aligned with the calibration structure, thereby calibrating the wind vane. This invention enables convenient and quick calibration of the wind vane without calibrating the centerline of the cabin.

[0023] 2. By setting up a driving component, the rotating part can rotate under the drive of the driving component, and automatic alignment can be achieved through the cooperation of the controller and the rangefinder.

[0024] 3. The correction structure of the present invention includes a laser sensor. The positioning component rotates left and right under the drive of the second motor, thereby causing the wind vane to rotate left and right. The laser sensor detects the position of the reference mark on the wind vane in real time according to the amount of laser reflection received. When the reference mark is aligned with the laser sensor, the amount of laser received by the laser sensor reaches the set value. At this time, the controller controls the second motor to stop, thereby realizing the automatic alignment of the reference mark. Attached Figure Description

[0025] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0026] Figure 1 is a diagram showing the usage state of the present invention.

[0027] Figure 2 is a cross-sectional structural diagram of the present invention in use.

[0028] Figure 3 is a schematic diagram of the AA cross-sectional structure in Figure 1.

[0029] Figure 4 is a schematic diagram of the BB cross-sectional structure in Figure 1.

[0030] Figure 5 is a schematic diagram of the CC cross-sectional structure in Figure 4.

[0031] Figure 6 is a schematic diagram of the state when the wind vane calibration is completed.

[0032] Figure 7 is a schematic diagram of the state of the rotating component of the present invention when it swings.

[0033] Figure 8 is a schematic diagram of the state detected by the laser sensor of the present invention.

[0034] Reference numerals: 1. Fixed column; 2. Wind vane; 3. Connecting sleeve; 4. Reference mark; 5. Step surface; 10. Clamping component; 11. First clamping ring; 12. Second clamping ring; 13. Longitudinal axis; 20. Bracket; 21. Support shaft; 30. Rotating component; 31. Rangefinder; 311. Distance measurement schematic line; 312. Central axis; 32. Window; 33. Bearing; 40. Extension rod; 41. Connecting component; 411. Arc-shaped part; 42. Second worm gear; 43. Second motor; 50. Positioning component; 51. First half-ring; 51. Worm gear tooth structure; 512. Arc groove; 52. Second half-ring; 53. Screw; 60. Laser sensor; 61. Support; 62. Laser beam; 70. Drive assembly; 71. Worm gear; 72. First worm gear; 73. First motor; 74. Bearing seat; 80. Adjusting seat; 81. Transverse hole; 82. Limiting bolt; 90. Controller; 100. Battery. Detailed Implementation

[0035] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0036] Example 1:

[0037] Referring to Figures 1-6, this invention provides a wind turbine wind vane calibration device, including a clamping member 10, a bracket 20, a rotating member 30, a rangefinder 31, and a positioning member 50. The clamping member 10 is installed at the lower end of the bracket 20 and is used to fix it to a fixed column 1. The rotating member 30 is installed at the upper end of the bracket 20, and two rangefinders 31 are installed on the rotating member 30. The two rangefinders 31 are installed at an angle to each other and symmetrically with respect to the central axis 312. The positioning member 50 is installed on the rotating member 30 above the clamping member 10 and is used to connect and support the lower end of the wind vane 2. The device also includes a calibration structure for calibrating the wind vane 2. A reference mark 4 is provided on the wind vane 2, and the calibration structure uses the reference mark 4 to position the circumferential position of the wind vane 2.

[0038] Referring to Figure 7, the rangefinder 31 is used to measure the distance to the step surface 5 of the cabin. By swinging the rotating component 30 left and right, when the distance values ​​displayed by the two rangefinders 31 are the same, that is, when the lengths of the distance measurement schematic lines 311 are equal, it indicates that the centerline 312 is perpendicular to the step surface 5. At this time, the centerline 312 is parallel to the centerline of the cabin. The wind vane 2 has a reference mark 4. By rotating and adjusting the wind vane 2, the reference mark 4 is aligned with the calibration structure, thereby calibrating the wind vane 2. This invention enables convenient and quick calibration of the wind vane without calibrating the centerline of the cabin.

[0039] In this embodiment, the two rangefinders 31 are at an angle of 30° to 60° to each other.

[0040] In this embodiment, referring to Figure 2, the rotating component 30 is a box structure. The lower side of the box structure is rotatably connected to the support shaft 21 of the bracket 20 through the bearing 33. The rangefinder 31 is installed on one side inside the box structure. The box structure is provided with a window 32 at the position corresponding to the rangefinder 31.

[0041] In this embodiment, the rangefinder 31 is a laser rangefinder or an infrared rangefinder.

[0042] In this embodiment, referring to Figure 3, the clamping member 10 adopts a clamping structure. The clamping member 10 includes a first clamping ring 11 and a second clamping ring 12. The first clamping ring 11 is welded and fixed to the bracket 20, and the second clamping ring 12 is installed on the first clamping ring 11 by bolts.

[0043] The centers of the clamping member 10 and the positioning member 50 are coaxial. Referring to Figures 2 and 7, the longitudinal axis 13 of the clamping member 10 and the positioning member 50 and the central axis 312 are on the same vertical plane.

[0044] Example 2:

[0045] Based on Embodiment 1, the rotating component 30 rotates via the drive assembly 70. A controller 90 is also installed within the housing structure. The controller 90 is electrically connected to the rangefinder 31 and the drive assembly 70. The controller 90 is powered by a built-in battery 100 or an external power source. By providing the drive assembly 70, the rotating component 30 can rotate under its drive. Through the cooperation of the controller 90 and the rangefinder 31, automatic alignment is achieved.

[0046] In this embodiment, referring to Figures 2 and 3, the drive assembly 70 includes a worm gear 71, a first worm 72, and a first motor 73. The drive assembly 70 is located inside the housing structure, with the upper end of the support shaft 21 extending into the housing structure. The worm gear 71 is mounted on the support shaft 21, and both ends of the first worm 72 are connected to the housing structure via bearing seats 74. The output shaft of the first motor 73 is connected to one end of the first worm 72 for transmission. The first motor 73 drives the first worm 72 to rotate, and since the worm gear 71 is fixedly mounted on the support shaft 21, the rotating component 30 rotates.

[0047] In this embodiment, the controller 90 may be a programmable logic controller, such as the Xinje Electric XL3 series standard controller.

[0048] Example 3:

[0049] In this embodiment, the wind vane 2 is manually rotated to align the reference mark 4 with the correction structure.

[0050] Specifically, the positioning component 50 is a ring structure. The lower end of the wind vane 2 is inserted into the ring structure, and the lower end of the wind vane 2 is fitted with the ring structure with a clearance. That is, the inner diameter of the ring structure is slightly larger than the diameter of the lower end of the wind vane 2, so that the wind vane 2 can rotate while ensuring its stability.

[0051] The correction structure is a reference mark line set on the positioning element 50, and the reference mark line and the central axis 312 are located in the same vertical plane.

[0052] After the central axis 312 is perpendicular to the step surface 5, manually rotate the wind vane 2 so that the reference mark 4 is aligned with the reference mark line, thus calibrating the wind vane 2.

[0053] Example 4:

[0054] The difference between this embodiment and embodiment 3 is that, as shown in Figures 1 and 2, the calibration structure in this embodiment includes a laser sensor 60. There is one laser sensor 60, and a support 61 is mounted on the rotating component 30. The laser sensor 60 is mounted on the support 61, and the laser beam of the laser sensor 60 is located on the same vertical plane as the central axis 312. The reference mark 4 is a longitudinally arranged reflective mark. The laser sensor 60 is electrically connected to the controller 90. When the wind vane 2 is manually rotated and the reference mark 4 is aligned with the laser sensor 60, the amount of laser light received by the laser sensor 60 reaches the set value. At this time, the controller 90 issues an audible and / or visual prompt to calibrate the wind vane 2.

[0055] It should be noted that, referring to Figures 2, 7, and 8, the longitudinal axis 13 of the clamping member 10 and the positioning member 50, as well as the laser beam 62 of the laser sensor 60, are on the same vertical plane as the central axis 312. The vertical plane is a plane perpendicular to the horizontal plane.

[0056] In this embodiment, the laser sensor 60 is a laser photoelectric sensor with laser emission and reception functions.

[0057] Example 5:

[0058] Based on Example 4, this example implements automatic alignment of reference mark 4.

[0059] Specifically, referring to Figures 2, 4, and 5, the positioning component 50 is a ring structure, and the lower end of the wind vane 2 is connected to the limiting ring structure. The positioning component 50 is connected to the rotating component 30 through the connecting component 41. The outer wall of the positioning component 50 is a worm gear tooth structure 511. The upper and lower end faces of the positioning component 50 are respectively provided with arc-shaped grooves 512. The connecting component 41 is a groove structure. The ends of the groove walls on both sides of the connecting component 41 are respectively provided with inwardly extending arc-shaped parts 411. The arc-shaped parts 411 on the upper and lower sides are respectively slidably fitted into the arc-shaped grooves 512 on the upper and lower end faces of the positioning component 50. A second worm gear 42 is installed in the connecting component 41. A second motor 43 is installed on one side of the connecting component 41. The output shaft of the second motor 43 is connected to the second worm gear 42 for transmission. The second motor 43 is electrically connected to the controller 90.

[0060] The positioning component 50 rotates left and right under the drive of the second motor 43, thereby causing the wind vane 2 to rotate left and right. The laser sensor 60 detects the position of the reference mark 4 on the wind vane 2 in real time according to the amount of laser reflection received. When the reference mark 4 is aligned with the laser sensor 60, the amount of laser received by the laser sensor 60 reaches the set value. At this time, the controller 90 controls the second motor 43 to stop, realizing the automatic alignment of the reference mark 4.

[0061] In this embodiment, referring to Figure 4, the positioning member 50 includes a first half-ring 51 and a second half-ring 52. The first half-ring 51 is connected to the rotating member 30, and the second half-ring 52 is mounted on the first half-ring 51 by screws 53. The upper and lower end faces of the first half-ring 51 are respectively provided with arc-shaped grooves 512. The arc-shaped portions 411 on the upper and lower sides of the connecting member 41 are respectively slidably engaged in the arc-shaped grooves 512 on the upper and lower end faces of the first half-ring 51. With the above structure, the wind vane 2 can be tightly fixed while ensuring that the positioning member 50 can rotate.

[0062] Example 6:

[0063] Referring to Figures 1, 2, and 5, an adjusting seat 80 is mounted on the rotating component 30. The adjusting seat 80 is coaxial with the support shaft 21. A transverse hole 81 is provided on the adjusting seat 80. An extension rod 40 is fixedly connected to the positioning component 50, passing through the transverse hole 81 of the adjusting seat 80. A limiting bolt 82 is screwed onto the adjusting seat 80, abutting against the extension rod 40 to limit its position. By providing the adjusting seat 80 and the extension rod 40, it is convenient to replace the positioning component 50 and adjust its extension length as needed. In this design, to prevent the extension rod 40 from rotating, its cross-section is rectangular.

[0064] In another embodiment, referring to Figures 6 and 8, two laser sensors 60 are used. When two laser sensors 60 are used, if one laser sensor 60 receives a feedback signal while the other does not, it indicates that the wind vane 2 is tilted axially. In this case, to facilitate adjustment of the axial tilt of the wind vane 2, the extension rod 40 has a circular cross-section. During adjustment, loosen the limiting bolt 82, rotate the extension rod 40 to adjust, and tighten the limiting bolt 82 after adjustment. Of course, the extension rod 40 can also be electrically adjusted.

[0065] Example 7:

[0066] Based on Example 5, referring to Figures 1, 7, and 8, a method for calibrating a wind vane for a wind turbine generator set, employing the aforementioned wind vane calibration device, includes the following steps:

[0067] S1. Referring to Figure 1, a fixing column 1 is installed on the top of the nacelle of the wind turbine. The calibration device is installed on the fixing column 1 using the clamping part 10. During installation, the calibration device is initially aligned with the step surface 5 of the nacelle, and then the connecting sleeve 3 is fitted onto the fixing column 1.

[0068] S2. Install the lower end of the wind vane 2 onto the positioning component 50.

[0069] S3. Start the controller 90. The beams of the two rangefinders 31 are respectively illuminating the step surface 5, as shown in Figure 7. The controller 90 reads the distance values ​​detected by the two rangefinders 31 in real time and controls the first motor 73 to start, causing the rotating part 30 to swing left and right. If the distance values ​​detected by the two rangefinders 31 are different, the rotating part 30 swings towards the rangefinder 31 with the smaller value until the distance values ​​detected by the two rangefinders 31 are within the set range, as shown in Figure 7. At this time, the controller 90 controls the first motor 73 to stop. At this time, the laser beams of the two rangefinders 31 form an isosceles triangle with the step surface 5. The central axis 312 is now perpendicular to the step surface 5 and parallel to the centerline of the cabin.

[0070] S4. Then, the controller 90 controls the second motor 43 and the laser sensor 60 to start. The positioning component 50 rotates left and right under the drive of the second motor 43, thereby driving the wind vane 2 to rotate left and right. See Figure 8. The laser sensor 60 detects the position of the reference mark 4 on the wind vane 2 in real time according to the amount of laser reflection received. When the reference mark 4 is aligned with the laser sensor 60, the amount of laser received by the laser sensor 60 reaches the set value. At this time, the controller 90 controls the second motor 43 to stop.

[0071] S5. Move the connecting sleeve 3 upwards, simultaneously covering the lower ends of the fixed column 1 and the wind vane 2. First, connect and fix the connecting sleeve 3 to the fixed column 1 with bolts, and then connect and fix the lower end of the wind vane 2 to the connecting sleeve 3 with bolts, as shown in Figure 6. The connecting sleeve 3 has two layers of bolts installed on its upper side to connect with the lower end of the wind vane 2. When installing the bolts on the upper side of the connecting sleeve 3, first symmetrically tighten the bolts by hand to abut against the lower end of the wind vane 2, and then symmetrically tighten them multiple times with a tool.

Claims

1. A wind vane calibration device for a wind turbine generator set, characterized in that: The system includes a clamping component (10), a bracket (20), a rotating component (30), a rangefinder (31), and a positioning component (50). The clamping component (10) is installed at the lower end of the bracket (20) and is used to fix it to the fixed column (1). The rotating component (30) is installed at the upper end of the bracket (20) and two rangefinders (31) are installed on the rotating component (30). The two rangefinders (31) are installed at an angle to each other and symmetrically with the central axis (312). The positioning component (50) is installed on the rotating component (30) above the clamping component (10) and is used to connect and support the lower end of the wind vane (2). The system also includes a calibration structure for calibrating the wind vane (2). A reference mark (4) is set on the wind vane (2), and the calibration structure uses the reference mark (4) to position the circumferential position of the wind vane (2).

2. A wind direction indicator calibration device for a wind turbine according to claim 1, characterized in that: The rotating component (30) is a box structure. The lower side of the box structure is rotatably connected to the support shaft (21) of the bracket (20) through the bearing (33). The rangefinder (31) is installed on one side inside the box structure. The box structure has a window (32) at the position corresponding to the rangefinder (31).

3. A wind direction indicator calibration device for a wind turbine according to claim 2, characterized in that: The rotating component (30) rotates through the drive assembly (70). A controller (90) is also installed inside the box structure. The controller (90) is electrically connected to the rangefinder (31) and the drive assembly (70). The controller (90) is powered by a built-in battery (100) or an external power source.

4. A wind direction indicator calibration device for a wind turbine according to claim 3, characterized in that: The drive assembly (70) includes a worm gear (71), a first worm (72), and a first motor (73). The drive assembly (70) is located inside the housing structure. The upper end of the support shaft (21) extends into the housing structure. The worm gear (71) is fixedly installed on the support shaft (21). The two ends of the first worm (72) are connected to the housing structure through bearing seats (74) respectively. The output shaft of the first motor (73) is connected to one end of the first worm (72) for transmission.

5. A wind direction indicator calibration device for a wind turbine according to claim 1, characterized in that: The positioning component (50) is a ring structure, and the lower end of the wind vane (2) is inserted into the ring structure with a clearance fit between the lower end of the wind vane (2) and the ring structure; the correction structure is a reference mark line set on the positioning component (50), and the reference mark line and the central axis (312) are located in the same vertical plane.

6. A wind direction indicator calibration device for a wind turbine according to claim 3, characterized in that: The correction structure includes one or two laser sensors (60), a support (61) is mounted on the rotating part (30), the laser sensor (60) is mounted on the support (61), and the laser beam of the laser sensor (60) is located on the same vertical plane as the central axis (312); the reference mark (4) is a longitudinally set reflective mark; the laser sensor (60) is electrically connected to the controller (90).

7. A wind direction indicator calibration device for a wind turbine according to claim 6, characterized in that: The positioning component (50) is a ring structure. The lower end of the wind vane (2) is connected to the ring structure for limiting. The positioning component (50) is connected to the rotating component (30) through the connector (41). The outer wall of the positioning component (50) is a worm gear tooth structure (511). The upper and lower end faces of the positioning component (50) are respectively provided with arc grooves (512). The connector (41) is a groove structure. The ends of the groove walls on both sides of the connector (41) are respectively provided with inwardly extending arc parts (411). The arc parts (411) on the upper and lower sides are respectively slidably fitted into the arc grooves (512) on the upper and lower end faces of the positioning component (50). A second worm (42) is installed in the connector (41). A second motor (43) is installed on one side of the connector (41). The output shaft of the second motor (43) is connected to the second worm (42) for transmission. The second motor (43) is electrically connected to the controller (90).

8. A wind direction indicator calibration device for a wind turbine according to claim 7, characterized in that: The positioning component (50) includes a first half-ring (51) and a second half-ring (52). The first half-ring (51) is connected to the rotating component (30). The second half-ring (52) is installed on the first half-ring (51) by screws (53). The upper and lower end faces of the first half-ring (51) are respectively provided with arc grooves (512). The arc-shaped parts (411) on the upper and lower sides of the connecting component (41) are respectively slidably fitted into the arc grooves (512) on the upper and lower end faces of the first half-ring (51).

9. A wind direction indicator calibration device for a wind turbine according to claim 1, characterized in that: An adjusting seat (80) is installed on the rotating part (30). The adjusting seat (80) is coaxial with the support shaft (21). A transverse hole (81) is provided on the adjusting seat (80). An extension rod (40) is fixedly connected to the positioning part (50). The extension rod (40) passes through the transverse hole (81) of the adjusting seat (80). A limiting bolt (82) is screwed onto the adjusting seat (80). The limiting bolt (82) abuts against the extension rod (40) to limit the extension rod (40).

10. A method of calibrating a wind vane of a wind turbine system, characterized by: The wind vane calibration device for a wind turbine generator set as described in claim 7 is used, and the calibration method includes the following steps: S1. Install a fixed column (1) on the top of the nacelle of the wind turbine generator, and install the calibration device on the fixed column (1) using the clamping part (10). During installation, align the calibration device with the step surface (5) of the nacelle, and then put the connecting sleeve (3) on the fixed column (1). S2. Install the lower end of the wind vane (2) onto the positioning component (50); S3. Start the controller (90). The beams of the two rangefinders (31) are respectively illuminating the step surface (5). The controller (90) reads the distance values ​​detected by the two rangefinders (31) in real time and controls the first motor (73) to start, so that the rotating part (30) swings left and right. If the distance values ​​detected by the two rangefinders (31) are large and small, the rotating part (30) swings towards the rangefinder (31) with the smaller value until the distance values ​​detected by the two rangefinders (31) are within the set range. Then the controller (90) controls the first motor (73) to stop. S4. After that, the controller (90) controls the second motor (43) and the laser sensor (60) to start. The positioning component (50) rotates left and right under the drive of the second motor (43), thereby driving the wind vane (2) to rotate left and right. The laser sensor (60) detects the position of the reference mark (4) on the wind vane (2) in real time according to the amount of laser reflection received. When the reference mark (4) is aligned with the laser sensor (60), the amount of laser received on the laser sensor (60) reaches the set value. At this time, the controller (90) controls the second motor (43) to stop. S5. Move the connecting sleeve (3) up and simultaneously cover the lower ends of the fixed column (1) and the wind vane (2). First, connect and fix the connecting sleeve (3) to the fixed column (1) with bolts, and then connect and fix the lower end of the wind vane (2) to the connecting sleeve (3) with bolts. There are two layers of bolts installed on the upper side of the connecting sleeve (3) to connect with the lower end of the wind vane (2). When installing the bolts on the upper side of the connecting sleeve (3), first symmetrically tighten the bolts by hand to abut against the lower end of the wind vane (2), and then symmetrically tighten them with tools in multiple times.

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