Wind wheel blade torque compensator and wind driven generator

Abstract

The invention provides a wind wheel blade torque compensator and a wind driven generator, belongs to the technical field of wind power generation, and is used for solving the problems of output power and service life of a wind wheel. The wind turbine blade torque compensator comprises an operation module, a driving module and a control module. And the operation module is arranged in the blade. The operation module can reciprocate in the length direction of the blades. The driving module is connected to the operation module. The driving module is used for driving the operation module to move to adjust the length of the force arm of the blade. The control module is connected to the driving module. The control module is used for controlling the driving module according to the operation parameters of the blades so as to adjust the position of the operation module in the blades, then the length of the force arm of the blades is changed, the torque of the blades is compensated, and the service life of the wind wheel can be prolonged while the output power is guaranteed.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind power generation, and in particular relates to a wind wheel blade torque compensator and a wind generator. Background Art

[0002] During the operation of large wind turbines, parameters such as wind speed, direction, and the resulting changes in blade root load have a significant impact on the turbine's output power. Currently, optimizing wind turbine control algorithms is the primary approach to improving turbine rotor output power. However, increasing rotor output power also increases the aerodynamic load on the blades, shortening the turbine's rotor lifespan. Summary of the Invention

[0003] Therefore, the technical problem to be solved by the present invention is to provide a wind rotor blade torque compensator and a wind turbine generator, which can improve the service life of the wind rotor while ensuring the output power.

[0004] In a first aspect, the present invention provides a wind turbine blade torque compensator, comprising an operating module, a drive module, and a control module. The operating module is disposed within the blade. The operating module is capable of reciprocating in the length direction of the blade. The drive module is connected to the operating module. The drive module is configured to drive the operating module to move so as to adjust the length of the blade's lever arm. The control module is connected to the drive module. The control module is configured to control the drive module based on the operating parameters of the blade to adjust the position of the operating module within the blade, thereby changing the length of the blade's lever arm to compensate for the blade's torque.

[0005] The operating module includes a slideway, a fixture, and a counterweight. The slideway is located within the blade, extending from the root of the blade to the tip. The fixture is movably mounted on the slideway. The counterweight is mounted on the fixture and moves synchronously with the fixture. The drive module is connected to the fixture to drive the fixture along the slideway.

[0006] The slideway extends from the root of the blade to one-third of the length of the blade.

[0007] There are two slideways, the two slideways being parallel to each other. The fixing device is movably disposed on the pair of slideways. The fixing device is provided with a slot, and the counterweight is mounted in the slot.

[0008] The drive module includes a pair of synchronous motors, one at each end of the operating path of the operating module. The motors are connected to the operating module via a transmission belt to drive the module in periodic operation. The control module is connected to the motors to control their synchronous operation.

[0009] The control module includes an acquisition unit and an adjustment unit. The acquisition unit is used to acquire operating parameters. The adjustment unit is used to control the driving direction and driving speed of the driving module according to the operating parameters, thereby adjusting the operating speed and operating direction of the operating module.

[0010] The operating parameters include the operating cycle of the blade and the resultant force acting on the blade in the direction of rotation.

[0011] The wind rotor blade torque compensator further includes a data processing module, which is used to obtain the output power of the wind rotor.

[0012] The data processing module includes a lift sensor, a gravity sensor, an angle sensor, and a controller. The lift sensor measures the lift acting on the blade. The gravity sensor measures the gravity acting on the blade. The angle sensor measures the angle between the blade and the horizontal. The controller calculates the output power based on the lift, gravity, angle, and blade moment arm.

[0013] In a second aspect, the present invention provides a wind turbine, wherein a wind turbine rotor comprises a rotating shaft and three blades, each of which comprises a wind turbine blade torque compensator as described above.

[0014] Beneficial effects:

[0015] The wind turbine blade torque compensator provided by the present invention includes an operating module, a driving module and a control module. The control module can control the driving module to drive the operating module to move according to the operating parameters of the blade to adjust the length of the blade's lever arm, thereby compensating for the blade's torque. When the resultant force on the blade in the rotation direction becomes larger, the control module drives the operating module through the driving module to move toward the root of the blade, thereby reducing the length of the blade's lever arm, thereby reducing the blade's torque and helping to extend the blade's life; when the resultant force on the blade in the rotation direction becomes smaller, the control module drives the operating module through the driving module to move away from the blade's root, thereby increasing the length of the blade's lever arm, thereby ensuring that the output power of the wind turbine is maximized. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 A schematic structural diagram of a wind turbine blade torque compensator according to an embodiment of the present invention;

[0017] Figure 2 A force analysis diagram of a wind turbine blade according to an embodiment of the present invention;

[0018] Figure 3 A functional relationship diagram of the resultant force F1 exerted on a blade in the rotational direction and the angle θ between the blade and the horizontal direction in an embodiment provided by the present invention;

[0019] Figure 4A schematic diagram of the wind wheel structure of a wind turbine according to an embodiment of the present invention.

[0020] The reference numerals indicate:

[0021] 001, wind wheel;

[0022] 01. Blade; 02. Rotating shaft;

[0023] 1. Wind rotor blade torque compensator;

[0024] 11. Operation module; 12. Drive module; 13. Control module; 14. Data processing module;

[0025] 111. Slideway; 112. Fixing device; 113. Counterweight;

[0026] 121. Synchronous motor; 122. Transmission belt;

[0027] 131. Acquisition unit; 132. Adjustment unit;

[0028] 141. Lift sensor; 142. Gravity sensor; 143. Angle sensor; 144. Controller. DETAILED DESCRIPTION

[0029] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0030] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of the technical features being referred to. Thus, a feature identified as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

[0031] In the present invention, unless otherwise expressly specified or limited, the terms "mounted," "connected," "connect," "fixed," etc. should be understood broadly. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediary; or internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0032] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present invention, and are not used to limit the present invention.

[0033] In a first aspect, the present invention provides a wind turbine blade torque compensator 1 . Figure 1 This is a schematic structural diagram of a wind turbine blade torque compensator 1 provided in this embodiment.

[0034] like Figure 1 As shown, the wind turbine blade torque compensator 1 includes an operating module 11, a driving module 12 and a control module 13. The operating module 11 is arranged in the blade 01. The operating module 11 can move back and forth in the length direction of the blade 01. The driving module 12 is connected to the operating module 11. The driving module 12 is used to drive the operating module 11 to move to adjust the length of the lever arm of the blade 01. The control module 13 is connected to the driving module 12. The control module 13 is used to control the driving module 12 according to the operating parameters of the blade 01 to adjust the position of the operating module 11 in the blade 01, thereby changing the length of the lever arm of the blade 01 to compensate for the torque of the blade 01.

[0035] It should be noted that the lever arm in this embodiment refers to the distance l between the point of action of the resultant force F1 of the blade 01 and the rotation axis 02 when the blade 01 rotates. In this embodiment, the resultant force F1 of the blade 01 when rotating only considers the lift F and gravity G of the blade 01. Figure 2 This is a force analysis diagram of a blade 01 of a wind wheel 001 provided in this embodiment, wherein θ is the angle between the blade 01 and the horizontal direction.

[0036] The control module 13 of this embodiment can control the drive module 12 to drive the operation module 11 to move according to the operating parameters of the blade 01, so as to adjust the length of the lever arm of the blade 01 and thereby compensate for the torque of the blade 01. When the resultant force applied to the blade 01 in the direction of rotation increases, the control module 13 drives the operation module 11 to move toward the root of the blade 01 through the drive module 12, thereby reducing the length of the lever arm of the blade 01 and reducing the torque of the blade 01, which is conducive to extending the life of the blade 01. When the resultant force applied to the blade 01 in the direction of rotation decreases, the control module 13 drives the operation module 11 to move away from the root of the blade 01 through the drive module 12, thereby increasing the length of the lever arm of the blade 01 and ensuring that the output power of the wind wheel 001 is maximized.

[0037] Among them, Figure 1 As shown, the operating module 11 includes a slide 111, a fixture 112, and a counterweight 113. The slide 111 is disposed within the blade 01. The slide 111 extends from the root of the blade 01 to the tip of the blade 01. The fixture 112 is movably disposed on the slide 111. The counterweight 113 is disposed on the fixture 112 and moves synchronously with the fixture 112. The driving module 12 is connected to the fixture 112 to drive the fixture 112 to move along the slide 111.

[0038] In this embodiment, if Figure 2 As shown, blade 01 rotates counterclockwise around axis 02, and only the lift and gravity effects are considered. When the angle between blade 01 and the horizontal direction is θ, the resultant force F1 acting on blade 01 is:

[0039] F1=F-GCOSθ (1)

[0040] Wherein, F1 is the resultant force acting on blade 01, F is the lift acting on blade 01, G is the gravity acting on blade 01, and θ is the angle between blade 01 and the horizontal direction.

[0041] From formula (1), we can see that the resultant force F1 on blade 01 changes periodically with θ, and the relationship function is as follows: Figure 3 As shown. And the torque T of blade 01 is related to the force F1 of blade 01, and the relationship is:

[0042] T=F1l(2)

[0043] Where l is the length of the lever arm, that is, the distance from the point of application of the resultant force F1 to the axis of rotation O1.

[0044] From formula (2), we can see that when the resultant force F1 acting on blade O1 remains unchanged, the larger the lever arm l is, the larger the blade torque T is.

[0045] The output power P satisfies the formula:

[0046] P=Tω (3)

[0047] Where ω is the angular velocity of blade 01.

[0048] It can be seen from formula (3) that when the angular velocity ω of blade 01 remains unchanged, the greater the torque T of blade 01, the greater the output power.

[0049] like Figure 3 As shown, when the angle θ between blade 01 and the water direction is 0, the resultant force F1 acting on blade 01 is minimum, at which point F1 = FG; when the angle θ between blade 01 and the water direction is 180°, the resultant force F1 acting on blade 01 is maximum, at which point F1 = F + G. Analyzing from the above two extreme cases, when θ is 0, F1 is minimum, and the counterweight 113 should be located at the end of the slideway 111 away from the root of blade 01 to ensure maximum output power of the wind wheel. When θ is 180°, F1 is maximum, and the counterweight 113 should be located at the end of the slideway 111 close to the root of blade 01 to minimize the torque T of blade 01 and extend the life of blade 01.

[0050] This embodiment utilizes the driving module 12 to drive the fixing device 112 to move periodically along the slide 111, thereby driving the counterweight 113 to move periodically along the slide 111 to change the center of gravity position of the blade 01. When the resultant force F1 applied to the blade 01 during rotation increases, the counterweight 113 moves toward the root of the blade 01, and the center of gravity of the blade 01 approaches the rotation axis 02, thereby reducing the distance l between the point of action of the resultant force F1 applied to the blade 01 during rotation and the rotation axis, thereby reducing the torque of the blade 01 and extending the life of the blade 01. When the resultant force F1 applied to the blade 01 during rotation decreases, the counterweight 113 moves away from the root of the blade 01, and the center of gravity of the blade 01 moves away from the rotation axis 02, thereby increasing the distance l between the point of action of the resultant force F1 applied to the blade 01 during rotation and the rotation axis 02, thereby maximizing the output power of the blade 01.

[0051] Among them, Figure 1 As shown, the slideway 111 extends from the root of the blade 01 to one-third of the length of the blade 01. Such a setting can meet the use requirements, can ensure the output power of the wind turbine rotor 001, and maximize the service life of the wind turbine rotor 001.

[0052] It is understandable that the length of the slideway 111 in this embodiment is determined by specific usage requirements, and this embodiment does not impose too many restrictions on this.

[0053] Among them, Figure 1 As shown, there are two slideways 111. The two slideways 111 are parallel to each other. A fixing device 112 is movably arranged on the pair of slideways 111. A slot is provided on the fixing device 112. A counterweight block 113 is installed in the slot.

[0054] This embodiment sets two parallel slideways 111 and provides a slot on the fixing device 112 to fix the counterweight block 113, which can avoid the counterweight block 113 from shaking during the periodic operation of the blade 01 and ensure the stability of the adjustment process of the torque T of the blade 01.

[0055] Among them, Figure 1 As shown, the drive module 12 includes a pair of synchronous motors 121. The synchronous motors 121 are positioned at either end of the operating path of the operating module 11. The synchronous motors 121 are connected to both sides of the operating module 11 via transmission belts 122 to drive the operating module 11 in periodic operation. The control module 13 is connected to the synchronous motors 121 to control their synchronous operation.

[0056] In this embodiment, a pair of synchronous motors 121 are respectively disposed at two ends of the slideway 111 and connected to two sides of the fixing device 112 via a transmission belt 122 .

[0057] In this embodiment, the selection of synchronous motor 121 requires consideration of parameters such as motor power, speed, and torque to ensure that it can provide sufficient power to drive the counterweight in periodic motion. The synchronous motor 121 must be precisely positioned. When secured at both ends of the slideway, the drive direction must be parallel to the slideway 111, and the center of the pulley must be aligned with the connection point between the drive belt 122 and the fixture 112 to achieve optimal transmission efficiency.

[0058] When selecting the transmission belt 122, consider its strength, flexibility, and wear resistance. The length of the transmission belt 122 should be determined based on the distance between the two ends of the slideway 111 and the travel of the fixture 112 to ensure that the transmission belt 122 is neither too loose nor too tight during operation. Furthermore, the connection between the transmission belt 122, the pulley, and the fixture 112 must be secure and reliable to prevent the transmission belt 122 from falling off or slipping during operation, which could affect transmission efficiency.

[0059] This embodiment provides a pair of synchronous motors 121 to jointly drive the counterweight 113 of the operating module 11 to operate periodically, thereby ensuring that the position adjustment of the counterweight 113 is more accurate and stable, and preventing the counterweight 113 from slipping under the action of external force.

[0060] Among them, Figure 1 As shown, the control module 13 includes an acquisition unit 131 and an adjustment unit 132. The acquisition unit 131 is used to acquire operating parameters. The adjustment unit 132 is used to control the driving direction and driving speed of the driving module 12 according to the operating parameters, thereby adjusting the operating speed and operating direction of the operating module 11.

[0061] When acquiring parameters such as blade 01 mass, length, and operating cycle, acquisition unit 131 must employ precise measurement methods and equipment. Blade 01 mass can be measured using a high-precision load cell after blade 01 is manufactured. Blade 01 length can be measured accurately from the root to the tip using tools such as a laser rangefinder. The operating cycle can be determined by monitoring and analyzing the wind turbine's operational control system to determine the actual operating cycle of the rotor.

[0062] When regulating the driving direction and speed of the drive module 12 based on operating parameters, the regulating unit 132 must comprehensively consider a variety of factors. In addition to the aforementioned basic parameters such as the mass and length of the blade 01, the actual operating environment of the wind turbine must also be considered, such as the impact of changes in wind speed and direction on the forces acting on the blade 01. In areas with high wind speeds, the mass of the counterweight 113 can be appropriately increased to enhance its ability to regulate torque. In areas with frequent wind direction changes, the speed regulation of the counterweight 113 can be made more flexible to better adapt to changes in the forces acting on the blade 01.

[0063] For example, let's assume that the mass of a single blade 01 is M, the length of blade 01 is L, and the wind turbine operating period is t. Considering various factors, the mass of counterweight 113 is designed to be M / 10. Since the rotation period of rotor 001 is fixed, the average speed of counterweight 113 is set to L / 3t.

[0064] The operating parameters include the operating cycle of the blade 01 and the resultant force acting on the blade 01 in the rotation direction.

[0065] When obtaining the resultant force on blade 01 in the rotation direction, it is necessary to obtain the lift and gravity on blade 01 and the angle between blade 01 and the horizontal direction, and calculate the impact of changes in wind speed and wind direction on the force on the blade.

[0066] Among them, Figure 1 As shown, the wind rotor blade torque compensator 1 further includes a data processing module 14. The data processing module 14 is used to obtain the output power of the wind rotor 001, so as to monitor the effectiveness of the wind rotor blade torque compensator 1 in regulating the output power.

[0067] Among them, Figure 1 As shown, data processing module 14 includes a lift sensor 141, a gravity sensor 142, an angle sensor 143, and a controller 144. Lift sensor 141 is used to obtain the lift force acting on blade 01. Gravity sensor 142 is used to obtain the gravity acting on blade 01. Angle sensor 143 is used to obtain the angle between blade 01 and the horizontal. Controller 144 is used to obtain output power based on the lift force, gravity, angle, and moment arm of blade 01.

[0068] When the data processing module 14 obtains data such as the lift F, gravity G, angle θ with the horizontal direction, and lever arm l (the distance from the point of application of the resultant force F1 to the rotation axis) of each blade on the impeller, it is necessary to install multiple sensors on the blade 01. For example, multiple pressure sensors are installed on the surface of the blade 01 to obtain lift and gravity data respectively, and the angle between the blade 01 and the horizontal direction is measured by the angle sensor 143. For the acquisition of the lever arm l (the distance from the point of application of the resultant force F1 to the rotation axis), it may be necessary to combine the geometric shape of the blade and the data measured by the sensor for calculation. These sensors need to have high precision, high reliability and anti-interference capabilities to ensure that the acquired data is accurate.

[0069] When calculating output power, first accurately calculate the net force F1 acting on blade O1 based on sensor data. Then, calculate blade O1 torque T, and finally, calculate the rotor output power P. During the calculation process, attention should be paid to the consistency of data units and calculation accuracy. For example, when calculating blade torque T, the length units of the lever arm l must match the units of force to ensure the accuracy of the calculation results. Furthermore, for some complex mathematical operations, computer software can be used to assist in the calculation to improve efficiency and accuracy.

[0070] In a second aspect, the present invention provides a wind turbine. Figure 4 This is a schematic structural diagram of a wind turbine rotor 001 provided in this embodiment.

[0071] like Figure 4 As shown, the wind turbine 001 of the embodiment includes a rotating shaft 02 and three blades 01. Each blade 01 includes one of the above-mentioned wind turbine blade torque compensators 1.

[0072] The wind turbine blade 01 of this embodiment is equipped with the rotor blade torque compensator 1 of the above-described embodiment, thereby achieving all the aforementioned beneficial effects, which will not be further elaborated here. Therefore, by incorporating the rotor blade torque compensator 1 of the above-described embodiment into blade 01, this embodiment achieves the goals of optimizing wind turbine power, reducing wind turbine load, and extending the service life of the wind turbine rotor.

[0073] It is easy for those skilled in the art to understand that, under the premise of no conflict, the above-mentioned advantageous methods can be freely combined and superimposed.

[0074] The above are merely preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention. The above are merely preferred embodiments of the present invention. It should be noted that those skilled in the art may make various improvements and variations without departing from the technical principles of the present invention, and such improvements and variations shall also be considered within the scope of protection of the present invention.

Claims

1. A wind turbine blade torque compensator, characterized in that: include: An operating module is provided in the blade; The operating module is capable of reciprocating in the length direction of the blade; A driving module connected to the operation module; The driving module is used to drive the operating module to move so as to adjust the length of the lever arm of the blade; A control module connected to the drive module; The control module is used to control the driving module according to the operating parameters of the blade to adjust the position of the operating module in the blade, thereby changing the length of the blade's lever arm to compensate for the blade's torque.

2. The wind turbine blade torque compensator according to claim 1, characterized in that: The operation module includes: A slideway is provided inside the blade; the slideway extends from the root of the blade to the end of the blade; a fixing device, movably arranged on the slide; A counterweight block is provided on the fixing device and moves synchronously with the fixing device; The driving module is connected to the fixing device to drive the fixing device to move along the slideway.

3. The wind turbine blade torque compensator according to claim 2, characterized in that: The slideway extends from the root of the blade to one third of the length of the blade.

4. The wind turbine blade torque compensator according to claim 2 or 3, characterized in that: There are two slideways; the two slideways are parallel to each other; The fixing device is movably arranged on a pair of the slideways; The fixing device is provided with a slot; the counterweight block is installed in the slot.

5. The wind turbine blade torque compensator according to claim 1, characterized in that: The driving module includes a pair of synchronous motors; A pair of synchronous motors are respectively arranged at two ends of the running track of the running module; A pair of synchronous motors are respectively connected to the operation modules through transmission belts to drive the operation modules to operate periodically; The control module is connected to the pair of synchronous motors to control the synchronous operation of the pair of synchronous motors.

6. The wind turbine blade torque compensator according to claim 1, characterized in that: The control module includes: an acquiring unit, configured to acquire the operating parameters; The regulating unit is used to control the driving direction and driving speed of the driving module according to the operating parameters, thereby regulating the operating speed and operating direction of the operating module.

7. The wind turbine blade torque compensator according to claim 1 or 6, characterized in that: The operating parameters include the operating cycle of the blade and the resultant force acting on the blade in the rotation direction.

8. The wind turbine blade torque compensator according to claim 1, characterized in that: Also includes: The data processing module is used to obtain the output power of the wind wheel.

9. The wind turbine blade torque compensator according to claim 8, characterized in that: The data processing module includes: A lift sensor, used to obtain the lift acting on the blade; A gravity sensor, used to obtain the gravity acting on the blade; An angle sensor, used to obtain the angle between the blade and the horizontal direction; A controller is used to obtain the output power according to the lift, the gravity, the angle and the lever arm of the blade.

10. A wind turbine, characterized in that: The wind turbine's rotor includes a rotating shaft and three blades; each of the blades includes a wind turbine blade torque compensator according to any one of claims 1 to 9.

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