Wind turbine generator set with vibration reduction function and construction method thereof

Abstract

The invention relates to the technical field of wind power generation, and discloses a wind turbine generator set with a vibration reduction function and a construction method thereof.According to the wind turbine generator set with the vibration reduction function, a vibration reduction structure is additionally arranged, and the two elastic ends, arranged in the axial direction, of an elastic buffering piece are connected with the outer wall of a tower drum and the inner wall of a sleeve correspondingly; the elastic buffering piece can effectively absorb and relieve vibration of the sleeve, vibration impact borne by the tower drum is reduced, the overall stability of the wind turbine generator is improved, and safe and stable movement of the wind turbine generator is guaranteed. Compared with a conventional scheme that the diameter or the wall thickness of the tower drum is increased, the damping structure is simple in structure, convenient to install and maintain and low in cost.

Description

Technical Field

[0001] The invention relates to the technical field of wind power generation, and in particular to a wind turbine set with a vibration reduction function and a construction method thereof. Background Art

[0002] As a clean and renewable energy form, wind energy has received extensive attention and application in recent years, especially in the construction of offshore wind farms, where it has shown great potential and advantages. However, wind turbines will vibrate during operation, especially under extreme weather conditions such as strong winds, when the vibration of the wind turbine tower will be more severe. Excessive vibration will not only affect the normal operation of wind turbines and reduce power generation efficiency, but may also cause fatigue damage to the wind turbine tower, shorten its service life, and even cause safety accidents. Therefore, reducing the vibration of the wind turbine tower is of great significance to ensure the safe and stable operation of wind power equipment.

[0003] In order to effectively improve the vibration of wind turbine towers, a common method is to increase the rigidity of the tower itself. Specifically, for example, the tower diameter is increased or its wall thickness is increased to improve the bending and torsional rigidity of the tower, thereby achieving the purpose of reducing vibration. Although this method can effectively alleviate the vibration problem to a certain extent, increasing the tower diameter or wall thickness means that more materials are needed to build the tower, which will not only greatly increase the amount of material used, but also lead to a significant increase in overall costs. Summary of the invention

[0004] In view of this, the present invention provides a wind turbine with a vibration reduction function and a construction method thereof, so as to solve the problem of higher costs caused by increasing the diameter or wall thickness of the tower.

[0005] In a first aspect, the present invention provides a wind turbine with a vibration reduction function, comprising a tower, a sleeve and a vibration reduction structure. The sleeve is used to be sleeved outside the tower, and the inner wall diameter of the sleeve is larger than the outer wall diameter of the tower to form an annular installation chamber; the vibration reduction structure comprises an elastic buffer, one end of the elastic buffer along its axial direction is connected to the outer wall of the tower, and the other end of the elastic buffer along its axial direction is connected to the inner wall of the sleeve, and the elastic buffer can be elastically deformed along its axial direction under the action of an external force.

[0006] Beneficial effect: By adding a vibration reduction structure, the two elastic ends of the elastic buffer arranged along its axial direction are connected to the outer wall of the tower and the inner wall of the sleeve respectively, so that the elastic buffer can effectively absorb and slow down the vibration of the sleeve, reduce the vibration impact on the tower, improve the overall stability of the wind turbine, and ensure the safe and stable movement of the wind turbine. Compared with the conventional solution of increasing the diameter or wall thickness of the tower, the vibration reduction structure of this structure is simple in structure, easy to install and maintain, and low in cost.

[0007] In an optional embodiment, the wind turbine with vibration reduction function also includes a detection structure, the detection structure includes an acceleration detection element, and the acceleration detection element is provided with a plurality of acceleration detection elements, and the plurality of acceleration detection elements are installed on the outer wall of the sleeve at intervals along the axial direction of the sleeve, and any one of the acceleration detection elements is electrically connected to a control terminal, and the acceleration detection element is used to collect vibration data at the position and convert it into a corresponding vibration electrical signal, and the control terminal is used to receive the vibration electrical signal and convert it into an adjustment electrical signal; the vibration reduction structure also includes an electric telescopic element, a fixed end of the electric telescopic element is installed on one of the inner wall of the sleeve and the outer wall of the tower, and a telescopic end of the electric telescopic element is installed on the other of the inner wall of the sleeve and the outer wall of the tower, and the electrical connection end of the electric telescopic element is electrically connected to the control terminal, and the electrical connection end of the electric telescopic element is used to receive an adjustment electrical signal and control the telescopic end of the electric telescopic element to adjust its damping coefficient.

[0008] Beneficial effects: By providing multiple speed detection components in the axial direction of the sleeve, the vibration conditions of the sleeve and the tower at different heights can be monitored comprehensively and in real time, and more comprehensive vibration data can be captured to provide data support for subsequent precise control. At the same time, the acceleration detection component converts the collected vibration data into corresponding vibration electrical signals and transmits them to the control terminal. After receiving the vibration electrical signals, the control terminal converts them into adjustment electrical signals and transmits them to the electric telescopic component, and adjusts its damping coefficient in real time, thereby realizing the adjustment of the electric telescopic component, so that the electric telescopic component can effectively absorb and slow down the vibration energy, and reduce the vibration impact on the wind turbine during operation. In addition, the control terminal can realize the collection, processing and analysis of vibration data, as well as remote control of the electric telescopic component, making the operation of the wind turbine more stable and reliable, and also convenient for operation and maintenance personnel to conduct remote monitoring and management.

[0009] In an optional embodiment, the wind turbine with vibration reduction function also includes a piezoelectric component, a plurality of the piezoelectric components are provided, the plurality of the piezoelectric components are arranged in an array, and the plurality of the piezoelectric components are installed on at least one of the inner wall of the sleeve and the outer wall of the tower, and the piezoelectric component is electrically connected to the energy storage component for transmitting the generated electric energy to the energy storage component and storing it in the energy storage component.

[0010] Beneficial effect: By arranging a piezoelectric element on at least one of the inner wall of the sleeve and the outer wall of the tower, the piezoelectric element converts vibration energy into electrical energy through the piezoelectric effect when it is compressed during vibration, and stores it for backup, which helps to reduce carbon emissions and environmental pollution.

[0011] In an optional embodiment, the wind turbine with vibration reduction function also includes an audible and visual alarm component, which is electrically connected to the control terminal. When the vibration data measured by the acceleration detection component exceeds a threshold, the control terminal triggers the audible and visual alarm signal and transmits it to the audible and visual alarm component.

[0012] Beneficial effects: By adding sound and light alarm components and electrically connecting them to the control terminal, since the acceleration detection component can monitor the vibration of the wind turbine in real time, when the measured vibration data exceeds the preset threshold, the control terminal will generate a trigger sound and light alarm signal and transmit it to the sound and light alarm component, establishing a real-time detection and early warning mechanism to ensure that the operation and maintenance personnel can obtain abnormal information during the sleeve vibration process in a timely manner, and take corresponding operation and maintenance measures based on the information obtained, such as shutdown inspection, adjustment of operating parameters, etc., thereby effectively preventing the occurrence of faults and avoiding greater damage to the wind turbine.

[0013] In an optional implementation, the wind turbine with vibration reduction function further includes a chassis, which is mounted on the end of the sleeve close to the ground, and is fixed above the ground using anchor bolts.

[0014] Beneficial effects: By installing the chassis at the end of the sleeve close to the ground, the chassis, as a connecting component with the ground, can increase the contact area with the ground, help improve its supporting capacity, and then reduce the vibration and shaking of the wind turbine during operation, thereby indirectly improving the shock absorption effect. At the same time, the chassis can withstand the weight and wind impact of the wind turbine during operation. By using anchor bolts, the chassis and wind turbine can be effectively prevented from displacement and tilting under the action of wind or other external forces, ensuring the safe operation of the wind turbine.

[0015] In the second aspect, the present invention also provides a construction method for a wind turbine with a vibration reduction function, which is applied to the wind turbine with a vibration reduction function provided in the first aspect. The construction method includes: a preparation stage: completing the material selection of the sleeve and the elastic buffer, and optimizing the height and wall thickness of the sleeve; an installation stage: completing the installation of the tower, and putting the sleeve on the outside of the tower, and then installing the elastic buffer between the sleeve and the tower.

[0016] Beneficial effects: By optimizing the height and wall thickness of the sleeve, the risk of resonance can be reduced. At the same time, by reasonably setting the height of the sleeve, the wind turbine can be more economical and practical while maintaining high performance. On the premise that the vibration reduction effect and structural safety meet the design requirements, reducing the height helps to reduce material costs and help improve the overall economic benefits of the wind power project.

[0017] In an optional embodiment, during the preparation stage, when selecting the material for the sleeve, the height H of the sleeve is preset. b It is initially determined to be 1.5 times the height of the tower's center of gravity and no higher than the tower's height. The diameter is 0.5 to 1.0 m larger than the tower's diameter, and the wall thickness is 10 to 20 mm.

[0018] In an optional implementation, in the preparation stage, the stiffness of the spring needs to be calculated and selected based on the mass parameters and vibration parameters of the tower. The maximum displacement of the tower at the preset spring installation position is δ, the design wind pressure of the environment is p, and the tower diameter is D. The wind pressure F on the cylindrical structure is max and the selected minimum spring stiffness K min Estimate as follows: F max =p*π*D*H b ; K mm =n*F max / δ; where n is the safety factor, which is taken as 1.5.

[0019] In an optional embodiment, in the preparation stage, after the preliminary material selection of the sleeve is completed, the height and wall thickness dimensions of the sleeve are optimized by the finite element analysis method to ensure that the vibration reduction effect and structural strength meet the requirements; wherein, in the process of finite element analysis, a static analysis is first performed to calculate the maximum stress and deformation of the cylinder under the action of wind load; then a modal analysis is performed to evaluate whether the natural frequency of the cylinder is close to the operating frequency of the wind turbine. If the natural frequency of the tower is close to the operating frequency of the wind turbine, the natural frequency of the tower is adjusted away from the operating frequency of the wind turbine by adjusting the wall thickness of the tower.

[0020] In an optional implementation, during the installation phase, the installation of the electric telescopic component, the piezoelectric component and the sound and light alarm component is completed. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] In order to more clearly illustrate the technical solutions in the specific implementation modes of the present invention, the drawings required for use in the description of the specific implementation modes will be briefly introduced below. Obviously, the drawings described below are some implementation modes of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0022] Figure 1A schematic front view of a wind turbine with vibration reduction function provided by the present invention;

[0023] Figure 2 A front view schematic diagram of a wind turbine with a vibration reduction function provided by the present invention, in which a vibration reduction structure, a detection structure and a piezoelectric element are installed on a sleeve;

[0024] Figure 3 A schematic side view of a wind turbine with a vibration reduction function provided by the present invention, in which a vibration reduction structure, a detection structure and a piezoelectric element are installed on a sleeve;

[0025] Figure 4 A schematic top view of a wind turbine with a vibration reduction function provided by the present invention, in which a vibration reduction structure, a detection structure and a piezoelectric element are installed on a sleeve;

[0026] Figure 5 A simplified side view of a wind turbine with vibration reduction function provided by the present invention;

[0027] Figure 6 A schematic flow chart of a construction method of a wind turbine with vibration reduction function provided by the present invention.

[0028] Description of reference numerals:

[0029] 1. Tower;

[0030] 2. sleeve; 21. cylinder; 211. bolt hole;

[0031] 3. Vibration reduction structure; 31. Elastic buffer; 32. Electric telescopic part;

[0032] 4. Detection structure; 41. Acceleration detection component;

[0033] 5. Piezoelectric components. DETAILED DESCRIPTION

[0034] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0035] In the description of the present application, it should be understood that the orientations or positional relationships indicated by terms such as "vertical", "top", "bottom", "inside" and "outside" are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application 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 a limitation on the present application.

[0036] In the description of the present application, unless otherwise specified, “plurality” means two or more.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0039] In conventional solutions, in order to improve the vibration of the wind turbine tower, the tower's own stiffness is increased. For example, the tower's diameter is increased or its wall thickness is increased to improve the tower's bending and torsional stiffness, thereby achieving the purpose of reducing vibration. However, increasing the tower's diameter or wall thickness means that more materials are needed to construct the tower, which not only greatly increases the amount of material used, but also leads to a significant increase in overall costs.

[0040] To this end, the present application installs a sleeve externally on the tower, and makes the radial dimension of the sleeve larger than the radial dimension of the tower, so that the inner wall of the sleeve and the outer wall of the tower are enclosed in the radial direction to form an installation chamber, and a vibration-damping structure is installed inside the installation chamber to improve the vibration phenomenon.

[0041] Figure 1 A schematic front view of a wind turbine with a vibration reduction function provided by the present application is shown; Figure 2 A front view schematic diagram showing a vibration reduction structure, a detection structure and a piezoelectric element installed on a sleeve in a wind turbine with a vibration reduction function provided by the present application; Figure 3 A schematic side view of a wind turbine with a vibration reduction function provided by the present application, in which a vibration reduction structure, a detection structure and a piezoelectric element are installed on a sleeve; Figure 4 A schematic top view showing a vibration reduction structure, a detection structure and a piezoelectric element installed on a sleeve in a wind turbine with a vibration reduction function provided by the present application; Figure 5 A simplified side view of a wind turbine with a vibration reduction function provided by the present application is shown; Figure 6 A schematic flow chart of a construction method of a wind turbine with a vibration reduction function provided in the present application is shown.

[0042] Combine the following Figures 1 to 6 , describing an embodiment of the present invention.

[0043] According to an embodiment of the present invention, in a first aspect, a wind turbine with a vibration reduction function is provided. Figure 1 and Figure 2 As shown, the wind turbine generator set comprises a tower 1, a sleeve 2 and a vibration reduction structure 3. The sleeve 2 is used to be sleeved outside the tower 1, and the vibration reduction structure 3 is arranged between the inner wall of the sleeve 2 and the outer wall of the tower 1 along the radial direction of the sleeve 2.

[0044] Specifically, the inner wall diameter of the sleeve 2 is made larger than the outer wall diameter of the tower 1, and the sleeve 2 and the tower 1 are coaxially arranged in a static state to form an annular installation chamber; the vibration reduction structure 3 includes an elastic buffer 31, one end of the elastic buffer 31 along its axial direction is connected to the outer wall of the tower 1, and the other end of the elastic buffer 31 along its axial direction is connected to the inner wall of the sleeve 2, and the elastic buffer 31 can be elastically deformed along its axial direction under the action of external force.

[0045] Therefore, by adding a vibration reduction structure 3, the two elastic ends of the elastic buffer 31 arranged along its axial direction are respectively connected to the outer wall of the tower 1 and the inner wall of the sleeve 2, so that the elastic buffer 31 can effectively absorb and reduce the vibration of the sleeve 2, reduce the vibration impact on the tower 1, improve the overall stability of the wind turbine, and ensure the safe and stable movement of the wind turbine. Compared with the conventional solution of increasing the diameter or wall thickness of the tower 1, the vibration reduction structure of this structure is simple in structure, easy to install and maintain, and low in cost.

[0046] It can be explained that there is no specific limitation on the structure of the sleeve 2, and it can be an integrated design; it can also be a split design, and during installation, the split sleeve 2 can be fastened with fasteners such as bolts and nuts.

[0047] Preferably, in the present application, the sleeve 2 is a semi-cylindrical body 21, and a strip-shaped outer edge is provided at two circumferential outer edges of each semi-cylindrical body 21, and a bolt hole 211 is opened at the outer edge.

[0048] Furthermore, the bolt hole 211 has a diameter of 20 to 30 mm and is of grade 8.8 or higher. At the same time, double nuts are used for locking. When multiple sets of bolts are used, the multiple sets of bolt holes 211 are Figure 2 , Figure 3 The vertical direction is shown to be arranged with equal spacing.

[0049] For example, the vertical spacing between two adjacent groups of bolt holes 211 is between 500 and 1000 mm.

[0050] In addition, when the outer edges of the two cylinders 21 are stacked, a sealing gasket needs to be placed between the two outer edges at any connection to prevent water and dust from entering.

[0051] Similarly, the sleeve 2 is preferably made of Q345B steel, which has good strength and toughness and can withstand the stress generated by the vibration of the wind turbine tower 1.

[0052] Similarly, the elastic buffer 31 is preferably a cylindrical helical tension spring, in which case the spring wire diameter is 10 to 20 mm, the average diameter (i.e., the average value of the inner diameter and outer diameter of the spring cross section) is 100 to 200 mm, the free length (i.e., the natural length without any external force) is 500 to 1000 mm, and the total number of turns is 8 to 12 turns.

[0053] like Figure 1 , Figure 2 , Figure 4 and Figure 5 As shown, the vibration reduction device also includes a detection structure 4, which includes an acceleration detection element 41. At this time, the acceleration detection element 41 is electrically connected to the control terminal. The acceleration detection element 41 is used to collect vibration data at the location and convert it into a corresponding vibration electrical signal. The control terminal is used to receive the vibration electrical signal and convert it into an adjustment electrical signal.

[0054] To facilitate the absorption of vibrations, the vibration reduction structure 3 also includes an electric telescopic member 32, a fixed end of the electric telescopic member 32 is installed on one of the inner wall of the sleeve 2 and the outer wall of the tower 1, a telescopic end of the electric telescopic member 32 is installed on the other of the inner wall of the sleeve 2 and the outer wall of the tower 1, an electrical connection end of the electric telescopic member 32 is electrically connected to the control terminal, and the electrical connection end of the electric telescopic member 32 is used to receive an adjustment electrical signal and control the telescopic end of the electric telescopic member 32 to adjust its damping coefficient.

[0055] Therefore, by providing a plurality of speed detection components in the axial direction of the sleeve 2, the vibration conditions of the sleeve 2 and the tower 1 at different heights can be monitored comprehensively and in real time, and more comprehensive vibration data can be captured to provide data support for subsequent precise control. At the same time, the acceleration detection component 41 converts the collected vibration data into corresponding vibration electrical signals and transmits them to the control terminal. After receiving the vibration electrical signals, the control terminal converts them into adjustment electrical signals and transmits them to the electric telescopic component 32, and adjusts its damping coefficient in real time, thereby realizing the adjustment of the electric telescopic component 32, so that the electric telescopic component 32 can effectively absorb and slow down the vibration energy, and reduce the vibration impact on the wind turbine during operation. In addition, the control terminal can realize the collection, processing and analysis of vibration data, as well as the remote control of the electric telescopic component 32, so that the operation of the wind turbine is more stable and reliable, and it is also convenient for operation and maintenance personnel to perform remote monitoring and management.

[0056] It can be explained that, in the present application, there is no specific limitation on the number of acceleration detection elements 41, and it can be one or more, where the number "multiple" is indicated as two or more. When there are multiple acceleration detection elements 41, the multiple acceleration detection elements 41 are installed on the outer wall of the sleeve 2 at intervals along the axial direction of the sleeve 2.

[0057] Preferably, the number of acceleration detection elements 41 is three. Figure 2 When arranged in the posture shown, along Figure 2 In the vertical direction shown, three acceleration detectors 41 are arranged at the top, middle and bottom of the tower 1 respectively.

[0058] Of course, when the number of acceleration detection elements 41 is greater, for example, a multiple of three, they are divided into three groups and arranged in the same manner as above.

[0059] Furthermore, the acceleration sensor is selected as a three-axis MEMS acceleration sensor with a measurement range of ±2g, a sensitivity of 0.1mg, and a sampling frequency of 1kHz, and is electrically connected to the control terminal through a bus to achieve data collection and transmission.

[0060] It can be explained that, in the present application, the electric telescopic member 32 is preferably an electric hydraulic cylinder. At this time, the number of the electric hydraulic cylinders is not specifically limited, and can be one, two or more. When the number of the electric hydraulic cylinders is two or more, the two or more electric hydraulic cylinders are evenly distributed along the circumferential direction of the axis of the tower 1 and installed between the outer wall of the tower 1 and the inner wall of the sleeve 2.

[0061] Preferably, six electric hydraulic cylinders are selected, and in this case, the angle between two adjacent electric hydraulic cylinders in the circumferential direction of the axis of the tower 1 is 60°.

[0062] like Figure 2 , Figure 4 and Figure 5 As shown, the wind turbine with vibration reduction function further includes a piezoelectric element 5 .

[0063] It can be explained that the piezoelectric element 5 is preferably a piezoelectric ceramic, such as PZT-5H piezoelectric ceramic, which has the advantages of a higher piezoelectric constant, a larger electromechanical coupling coefficient, and better temperature stability.

[0064] During installation, the PZT-5H piezoelectric ceramics are made into a circular component with a diameter of 20 mm and a thickness of 2 mm, and multiple PZT-5H piezoelectric ceramics are connected in series to increase the output voltage.

[0065] It can be explained that the number of piezoelectric elements 5 is set to be multiple, and the multiple piezoelectric elements 5 are arranged in an array, and the multiple piezoelectric elements 5 are installed on at least one of the inner wall of the sleeve 2 and the outer wall of the tower 1. The piezoelectric element 5 is electrically connected to the energy storage element for transmitting the generated electric energy to the energy storage element and storing it in the energy storage element.

[0066] Therefore, by arranging a piezoelectric element 5 on at least one of the inner wall of the sleeve 2 and the outer wall of the tower 1, when the piezoelectric element 5 is compressed during the vibration process, the vibration energy is converted into electrical energy through the piezoelectric effect, and stored for backup, which helps to reduce carbon emissions and reduce environmental pollution.

[0067] Preferably, a plurality of piezoelectric elements 5 are arranged in an array at both ends of the elastic buffer 31 and both ends of the electric telescopic element 32. In this arrangement, the strain energy generated by the vibration of the tower 1 drives the piezoelectric ceramics to deform, thereby outputting an AC voltage.

[0068] In addition, since the current output by the piezoelectric ceramic is alternating current, it is necessary to rectify and filter the alternating current and convert it into direct current before it can be stored or supplied. Since the components with rectification and filtering are relatively common, they will not be described in detail here.

[0069] For example, in order to improve the efficiency of energy utilization, the electric energy generated by the piezoelectric element 5 is used to power the control terminal, the acceleration sensor, and the wireless communication module.

[0070] That is, the AC power output by multiple piezoelectric ceramic arrays is converted into DC power after rectification and filtering, with a peak voltage of 10 to 20V and a current of tens of milliamperes. The DC power is boosted to 24V through a DC-DC converter for power supply.

[0071] At the same time, the excess electric energy is stored in the energy storage capacitor. When the wind conditions are good, the electric energy in the energy storage capacitor can be connected to the grid for power generation, thereby improving energy utilization efficiency.

[0072] Preferably, the energy storage capacitor is a farad capacitor with a capacity of 1500F and a rated voltage of 2.7V. Multiple capacitors are used in series and parallel to meet voltage and capacity requirements.

[0073] It can be explained that the wind turbine with vibration reduction function also includes an audible and visual alarm, which is electrically connected to the control terminal. When the vibration data measured by the acceleration detection element 41 exceeds the threshold, the control terminal triggers the audible and visual alarm signal and transmits it to the audible and visual alarm.

[0074] Therefore, by adding an audible and visual alarm component and electrically connecting the audible and visual alarm component to the control terminal, since the acceleration detection component 41 can monitor the vibration of the wind turbine in real time, when the measured vibration data exceeds the preset threshold, the control terminal will trigger the audible and visual alarm signal and transmit it to the audible and visual alarm component, and establish a real-time detection and early warning mechanism to ensure that the operation and maintenance personnel can obtain abnormal information during the vibration of the sleeve 2 in a timely manner, and take corresponding operation and maintenance measures based on the information obtained, such as shutting down for inspection, adjusting operating parameters, etc., so as to effectively prevent the occurrence of faults and avoid causing greater damage to the wind turbine.

[0075] It should be noted, however, that the system takes different countermeasures for vibration data exceeding the threshold to ensure equipment safety and operating efficiency. The specific strategies are as follows:

[0076] Exceeding the threshold by 5% to 10%: The equipment only issues an audible and visual alarm to alert staff, and the system continues to monitor subsequent vibration changes.

[0077] Exceeding the threshold by 10% to 30%: While sounding an alarm, the system reduces the speed or power output of the fan to reduce the impact of the vibration source and enters the early warning state.

[0078] Exceeding the threshold by 30% to 50%: The protection mode is triggered and the system will limit some functions of the wind turbine, such as switching to standby mode, to prevent further structural damage.

[0079] If the threshold is exceeded by 50% or more: the system immediately stops the operation of the wind turbine and enters emergency shutdown mode to avoid mechanical failure or accidents, and notifies the operation and maintenance personnel to carry out timely maintenance.

[0080] It can be explained that the wind turbine with vibration reduction function also includes a chassis, which is installed at the end of the sleeve 2 close to the ground, and is fixed above the ground using anchor bolts.

[0081] Therefore, by installing the chassis at the end of the sleeve 2 close to the ground, the chassis, as a connecting component with the ground, can increase the contact area with the ground, help improve its supporting capacity, and then reduce the vibration and shaking of the wind turbine during operation, thereby indirectly improving the shock absorption effect. At the same time, the chassis can withstand the weight and wind impact of the wind turbine during operation. By using anchor bolts, the chassis and wind turbine can be effectively prevented from displacement and tilting under the action of wind or other external forces, thereby ensuring the safe operation of the wind turbine.

[0082] It can be explained that the chassis is selected as a steel disc-shaped component. During installation, the steel chassis is welded to the bottom of the sleeve 2.

[0083] Furthermore, when selecting the type, the radial dimension of the chassis is made larger than the radial dimension of the sleeve 2 .

[0084] Preferably, the difference between the radial dimension of the chassis and the radial dimension of the sleeve 2 is between 100 and 200 mm. At this time, the thickness of the chassis is between 20 and 30 mm.

[0085] During installation, the chassis is fixed to the concrete foundation on the ground by anchor bolts to ensure the stability of the sleeve 2.

[0086] In a second aspect, the present invention also provides a construction method for a wind turbine with a vibration reduction function, which is applied to Figures 1 to 5 The first aspect shows a wind turbine generator set with vibration reduction function.

[0087] like Figure 6 As shown, the construction method includes: a preparation stage: completing the material selection of the sleeve 2 and the elastic buffer 31, and optimizing the height and wall thickness of the sleeve 2; an installation stage: completing the installation of the tower 1, and installing the sleeve 2 outside the tower 1, and then installing the elastic buffer 31 between the sleeve 2 and the tower 1.

[0088] Therefore, by optimizing the height and wall thickness of the sleeve 2, the risk of resonance can be reduced. At the same time, by reasonably setting the height of the sleeve 2, the wind turbine can be more economical and practical while maintaining high performance. On the premise that the vibration reduction effect and structural safety meet the design requirements, reducing the height helps to reduce material costs and help improve the overall economic benefits of the wind power project.

[0089] In the preparation stage, when selecting the material of the sleeve 2, the height H of the vibration damping cylinder 21 is preset. b It is initially determined to be 1.5 times the height of the center of gravity of tower 1 and not higher than the height of tower 1. The diameter is 0.5 to 1.0 m larger than the diameter of tower 1 and the wall thickness is 10 to 20 mm.

[0090] In the preparation stage, the stiffness of the spring needs to be calculated and selected based on the mass parameters and vibration parameters of the tower 1. The maximum allowable displacement of the tower 1 at the preset spring installation position is δ, the design wind pressure of the environment is p, and the diameter of the tower 1 is D. The wind pressure K on the cylindrical structure is max and the selected minimum spring stiffness K min Estimate as follows: F max =p*π*D*H b ; K min =n*F max / δ; where n is the safety factor, which is taken as 1.5.

[0091] In the preparation stage, after completing the preliminary material selection for the sleeve 2, the height dimension and wall thickness dimension of the sleeve 2 are optimized by the finite element analysis method to ensure that the vibration reduction effect and structural strength meet the requirements.

[0092] In the process of finite element analysis, a static analysis is first performed to calculate the maximum stress and deformation of the cylinder 21 under the action of wind load.

[0093] In order to clarify the calculation process, the following is a brief description of the method for obtaining the maximum stress and deformation:

[0094] Calculation of maximum stress: The maximum stress is usually obtained by static mechanical equations. When the wind load acts on the cylinder 21, a stress field will be generated inside the structure. The key formula is the stress calculation formula: σ max =M max *y / I; where, σ max is the maximum stress, M max is the maximum bending moment, which is determined by the external load and support conditions, y is the maximum distance to the neutral axis of the section, and I is the moment of inertia of the section.

[0095] When solving using finite element software, the program will discretize the structure into several units, calculate the stress distribution of each unit based on the material properties and load conditions, and finally summarize the maximum stress.

[0096] Calculation of maximum deformation: The calculation of maximum deformation is usually based on the displacement equation in material mechanics. For the case of uniform wind load, the deformation calculation formula is: δ max =q*L 4 / 8*E*I; among them, δ max is the maximum deformation, q is the uniformly distributed wind load per unit length, L is the length of the cylinder, E is the elastic modulus of the material, and I is the moment of inertia of the section.

[0097] In finite element analysis, the system will solve the displacement of each unit in the structure based on the discrete form of the above formula. Finally, the maximum deformation of the entire structure is obtained through iterative calculation.

[0098] Next, a modal analysis is performed to evaluate whether the natural frequency of the cylinder 21 is close to the operating frequency of the fan. If the natural frequency of the tower 1 is close to the operating frequency of the fan, the wall thickness of the tower 1 is adjusted to make the natural frequency of the tower 1 away from the operating frequency of the fan.

[0099] It should be noted that, in the present application, the ratio of the natural frequency of the cylinder 21 to the operating frequency of the fan is defined in the range of 0.8 to 1.2, which means that the natural frequency of the cylinder 21 is close to the operating frequency of the fan, and the ratio of the natural frequency of the cylinder 21 to the operating frequency of the fan is defined in the range of less than 0.8 or greater than 1.2, which means that the natural frequency of the cylinder 21 is far away from the operating frequency of the fan.

[0100] That is, when the ratio of the difference between the natural frequency of the cylinder 21 and the operating frequency of the fan to the operating frequency of the fan is less than or equal to 20%, it means that the natural frequency of the cylinder 21 is close to the operating frequency of the fan. When the ratio of the difference between the natural frequency of the cylinder 21 and the operating frequency of the fan to the operating frequency of the fan is greater than 20%, it means that the natural frequency of the cylinder 21 is far away from the operating frequency of the fan.

[0101] Specifically, the ratio of the natural frequency of the cylinder 21 to the operating frequency of the fan is between 0.8 and 1.2: the wall thickness needs to be adjusted to avoid possible resonance risk; when the ratio of the natural frequency of the cylinder 21 to the operating frequency of the fan is greater than 1.2 or less than 0.8, there is no need to further adjust the wall thickness because the area is considered safe enough and the resonance risk is low.

[0102] The optimization method is as follows: Take the total height of tower 1 as 80 meters and the center of gravity height as 50 meters. At this time, the height H of sleeve 2 is b It is 1.5 times the height of the tower 1, that is, the height H of the sleeve 2 at this time b =75m, at this time, the height of sleeve 2 will not be higher than the height of tower 1. The diameter of sleeve 2 will be 0.5-1m larger than the diameter of tower 1. Assuming that the diameter of tower 1 is 4m, the diameter of cylinder 21 can be selected between 4.5m and 5.0m. The wall thickness of sleeve 2 is initially selected to be 15mm.

[0103] Assuming that the bottom of the sleeve 2 is fixedly connected, the top of the sleeve 2 bears the wind load and the vibration load. At this time, the wind load and the vibration load are simulated by the wind speed and the working rate of the fan.

[0104] Preliminary analysis shows that the natural frequency of sleeve 2 is 1.2 Hz, while the operating frequency of the fan is 1 Hz. Since the difference between the natural frequency and the operating frequency is within 20% of the ratio of the operating frequency, there is a potential resonance risk.

[0105] At this time, in order to improve the safety of the structure and the vibration reduction effect, the size of the sleeve 2 is optimized.

[0106] First, the wall thickness of the cylinder 21 is increased and adjusted to 20 mm to further increase the rigidity of the cylinder 21 .

[0107] It should be noted that before adjusting the wall thickness, the maximum stress value was 250 MPa and the maximum deformation was 5 mm. After adjusting the wall thickness, that is, when the wall thickness of the cylinder 21 was adjusted to 20 mm, the finite element analysis results showed that the maximum stress was reduced to 150 MPa, indicating that after the stiffness was increased, the structural stress distribution was improved and the maximum deformation was reduced to 2 mm, further improving the structural stability of the system.

[0108] Through the new finite element analysis, static analysis shows that the maximum stress is reduced and the deformation is also reduced. Modal analysis shows that the natural frequency of the cylinder 21 is increased from 1.2Hz to 1.4Hz to 1.5Hz, away from the operating frequency of the fan, avoiding resonance problems.

[0109] It can be explained that the preparation stage should also include the setting of the amplitude warning threshold.

[0110] Specifically, based on the material, size and stress characteristics of the tower 1, the vibration displacement and velocity thresholds of the tower 1 under the fatigue limit state are determined through finite element simulation analysis and fatigue testing.

[0111] The top vibration displacement threshold is initially set to 0.2% of the height of tower 1, the middle vibration displacement threshold is set to 0.15% of the height of tower 1, and the bottom vibration displacement threshold is set to 0.1% of the height of tower 1; the vibration speed threshold is 1 to 2 cm / s.

[0112] When the measured vibration data exceeds the threshold, an alarm is sounded through the sound and light alarm inside the tower 1. At the same time, the alarm information is sent to the wind farm monitoring center through the wireless communication module, and the operation and maintenance personnel are notified by SMS push to deal with the abnormal situation in time.

[0113] During the installation phase, the installation of the electric telescopic member 32, the piezoelectric member 5 and the sound and light alarm member is completed.

[0114] When installing the electric telescopic part 32, that is, when installing the electric hydraulic cylinder, the cylinder body of the electric hydraulic cylinder is hingedly installed on the inner wall of the sleeve 2 as a fixed end, and the damping coefficient of the telescopic end of the electric telescopic part 32 is achieved by adjusting the length of the piston rod. The piston rod of the electric hydraulic cylinder is hingedly installed on the outer wall of the tower 1 as a telescopic end, and its stroke is 100 to 200 mm, and the rated pressure is 16 MPa. The electrical connection end of the electric hydraulic cylinder is a hydraulic system, and a proportional valve is used to control the telescopic length of the piston rod.

[0115] When in use, the acceleration detection element 41 converts the collected vibration data into corresponding vibration electrical signals and transmits them to the control terminal. After receiving the vibration electrical signals, the control terminal converts them into adjustment electrical signals and transmits them to the proportional valve to adjust the opening of the proportional valve, change the damping coefficient of the hydraulic cylinder, adjust the length of the piston rod, and realize semi-active vibration reduction control.

[0116] When installing the piezoelectric element 5 , the piezoelectric element 5 is bonded to the outer wall of the tower 1 or to the inner wall of the sleeve 2 .

[0117] When installing the sound and light alarm component, the sound and light alarm component is fixedly installed on the outer wall of the sleeve 2.

[0118] When installing the sleeve 2, if the sleeve 2 is a split design, that is, the sleeve 2 is composed of two cylinders 21 spliced ​​together, then after the two cylinders 21 are sleeved on the outer wall of the tower 1, the outer edges of the two cylinders 21 are stacked and arranged, and the bolt holes 211 provided on the two cylinders 21 are arranged one by one, and then the two cylinders 21 are fastened with bolts and nuts, so that the installed sleeve 2 appears Figures 2 to 5 The structure shown.

[0119] With such arrangement, by adding a sleeve 2 outside the tower 1 and adopting acceleration sensor feedback and controllable electrically controlled telescopic parts technology, the overall vibration of the tower 1 can be effectively reduced, thereby improving the safety and stability of the wind power equipment; secondly, by setting the sleeve 2 as two cylinders 21 and using springs and electrically controlled hydraulic cylinders, an overall structure with a simple structure, easy to manufacture and install is formed, and the design of the cylinder 21 is convenient for transportation and hoisting; thirdly, by adopting the cylinder 21 structure connected by bolts and nuts, the vibration reduction structure 3 and the sleeve 2 are located outside the tower 1, which is convenient for the installation and disassembly of the sleeve 2, the vibration reduction structure 3, the detection structure 4 and the piezoelectric element 5, and is convenient for subsequent inspection and maintenance, without affecting the normal operation of the wind turbine; at the same time, by setting the piezoelectric element 5 and collecting vibration energy, the system can be powered and energy stored for grid connection to improve energy utilization efficiency; in addition, a threshold is set, and multiple acceleration sensors are used to monitor the vibration of the sleeve 2 in real time, and sound, light and text messages are used to issue timely warnings to ensure the safety of the wind turbine.

[0120] Although the embodiments of the present invention have been described in conjunction with the accompanying drawings, those skilled in the art may make various modifications and variations without departing from the spirit and scope of the present invention, and such modifications and variations are all within the scope defined by the appended claims.

Claims

1. A wind turbine with vibration reduction function, characterized in that: include: Tower (1); A sleeve (2), the sleeve (2) being used for being sleeved outside the tower (1), and the inner wall diameter of the sleeve (2) being larger than the outer wall diameter of the tower (1), so as to form an annular installation chamber; A vibration damping structure (3), the vibration damping structure (3) comprising an elastic buffer (31), one end of the elastic buffer (31) along its axial direction is connected to the outer wall of the tower (1), and the other end of the elastic buffer (31) along its axial direction is connected to the inner wall of the sleeve (2), and the elastic buffer (31) can be elastically deformed along its axial direction under the action of an external force.

2. The wind turbine with vibration reduction function according to claim 1, characterized in that: The wind turbine with vibration reduction function further comprises a detection structure (4), the detection structure (4) comprising an acceleration detection element (41), a plurality of the acceleration detection elements (41) being provided, the plurality of the acceleration detection elements (41) being installed at intervals on the outer wall of the sleeve (2) along the axial direction of the sleeve (2), any one of the acceleration detection elements (41) being electrically connected to a control terminal, the acceleration detection element (41) being used to collect vibration data at a position and convert it into a corresponding vibration electrical signal, and the control terminal being used to receive the vibration electrical signal and convert it into an adjustment electrical signal; The vibration reduction structure (3) further comprises an electric telescopic member (32), wherein a fixed end of the electric telescopic member (32) is mounted on one of the inner wall of the sleeve (2) and the outer wall of the tower (1), and a telescopic end of the electric telescopic member (32) is mounted on the other of the inner wall of the sleeve (2) and the outer wall of the tower (1), and an electrical connection end of the electric telescopic member (32) is electrically connected to the control terminal, and the electrical connection end of the electric telescopic member (32) is used to receive an adjustment electrical signal and control the telescopic end of the electric telescopic member (32) to adjust its damping coefficient.

3. The wind turbine with vibration reduction function according to claim 1, characterized in that: Also includes: A piezoelectric element (5), wherein a plurality of the piezoelectric elements (5) are provided, the plurality of the piezoelectric elements (5) are arranged in an array, and the plurality of the piezoelectric elements (5) are installed on at least one of the inner wall of the sleeve (2) and the outer wall of the tower (1), and the piezoelectric element (5) is electrically connected to an energy storage element for transmitting the generated electric energy to the energy storage element and storing the generated electric energy in the energy storage element.

4. The wind turbine with vibration reduction function according to claim 1, characterized in that: Also includes: The sound and light alarm component is electrically connected to the control terminal. When the vibration data measured by the acceleration detection component (41) exceeds a threshold value, the control terminal triggers the sound and light alarm signal and transmits it to the sound and light alarm component.

5. The wind turbine with vibration reduction function according to claim 1, characterized in that: Also includes: A chassis is installed at the end of the sleeve (2) close to the ground, and the chassis is fixed above the ground using anchor bolts.

6. A construction method for a wind turbine with a vibration reduction function, applied to the wind turbine with a vibration reduction function as claimed in any one of claims 1 to 5, characterized in that: Construction methods include: Preparation stage: completing the selection of materials for the sleeve (2) and the elastic buffer (31), and optimizing the height and wall thickness of the sleeve (2); Installation stage: the installation of the tower (1) is completed, and the sleeve (2) is mounted outside the tower (1), and then the elastic buffer (31) is installed between the sleeve (2) and the tower (1).

7. The construction method of a wind turbine with vibration reduction function according to claim 6, characterized in that: In the preparation stage, when selecting the material of the sleeve (2), the height H of the cylinder (21) is preset. b It is initially determined to be 1.5 times the height of the center of gravity of the tower (1) and not higher than the height of the tower (1). The diameter is 0.5 to 1.0 m larger than the diameter of the tower (1) and the wall thickness is 10 to 20 mm.

8. The construction method of a wind turbine with vibration reduction function according to claim 6, characterized in that: In the preparation stage, the stiffness of the spring needs to be calculated and selected based on the mass parameters and vibration parameters of the tower (1). The maximum allowable displacement of the tower (1) at the preset spring installation position is δ, the design wind pressure of the environment is p, and the diameter of the tower (1) is D. The wind pressure F on the cylindrical structure is max and the selected minimum spring stiffness K min Estimate as follows: F max =p*π*D*H b ; K min =n*F max / δ; where n is the safety factor, which is taken as 1.

5.

9. The construction method of a wind turbine with vibration reduction function according to claim 6, characterized in that: In the preparation stage, after the preliminary material selection of the sleeve (2) is completed, the height dimension and wall thickness dimension of the sleeve (2) are optimized by finite element analysis method to ensure that the vibration reduction effect and structural strength meet the requirements; In the process of finite element analysis, a static analysis is first performed to calculate the maximum stress and deformation of the cylinder (21) under the action of wind load; then a modal analysis is performed to evaluate whether the natural frequency of the cylinder (21) is close to the operating frequency of the wind turbine. If the natural frequency of the tower (1) is close to the operating frequency of the wind turbine, the wall thickness of the tower (1) is adjusted to make the natural frequency of the tower (1) away from the operating frequency of the wind turbine.

10. The construction method of a wind turbine with vibration reduction function according to claim 6, characterized in that: During the installation phase, the installation of the electric telescopic member (32), the piezoelectric member (5) and the sound and light alarm member is completed.

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