Wind turbine anchor bolt deviation correction method and system, storage medium and electronic device

Abstract

The present disclosure belongs to the technical field of wind power, and provides a wind turbine anchor bolt deviation correction method, system, storage medium and electronic device. The method comprises: obtaining anchor bolt structure parameters of a wind turbine, a target forced displacement of a target anchor bolt and a target free deflection height, and determining a target additional stress of the target anchor bolt; obtaining foundation engineering parameters of a ring flange and corresponding anchor bolt and external load engineering parameters of the wind turbine, and determining a limit tension of an external load borne by the target anchor bolt; determining a limit total stress borne by the target anchor bolt based on the anchor bolt structure parameters, the limit tension of the external load, the target forced displacement of the target anchor bolt and the target additional stress; comparing the limit total stress borne by the target anchor bolt with a preset stress threshold, obtaining a comparison result, and outputting a target anchor bolt deviation correction instruction based on the comparison result. The operation feasibility of correcting the deviation of the anchor bolt when the tower bottom ring flange is aligned with the anchor bolt is improved, and the structural safety of the tower bottom ring flange and the anchor bolt is improved.

Description

Technical Field

[0001] This disclosure pertains to the field of wind power technology, and particularly relates to a method, system, storage medium, and electronic equipment for correcting anchor bolt deviation in wind turbine units. Background Technology

[0002] Prestressed anchors for wind turbine generators are a core structure in wind farm construction. As a key load-bearing component connecting the concrete foundation and the tower, the installation and positioning accuracy of the anchors directly determines the tower hoisting efficiency and the safe operation of the entire unit. The construction process of prestressed anchors is complex, involving multiple stages such as the placement of embedded parts, assembly of upper and lower anchor plates, reinforcement installation, and concrete installation. During construction, positional deviations may occur at the top of the anchors.

[0003] Anchor bolt misalignment directly causes difficulties in tower installation. If the misalignment is too large, the foundation will become unusable, resulting in significant economic losses for the company. If the misalignment is small, the industry typically uses external force to directly bend the anchor bolt to correct the deviation. However, this method generates an additional bending moment in the anchor bolt, causing the upper and lower sections of the bent anchor bolt to be eccentrically stressed. The preload and external tensile force will form a couple, further increasing the internal stress of the anchor bolt. Therefore, using external force to correct the anchor bolt misalignment increases the difficulty of operation and may also reduce the overall structural safety of the wind turbine.

[0004] Therefore, there is an urgent need to provide a method for correcting anchor bolt deviation in wind turbines that simultaneously improves operational feasibility and structural safety. Summary of the Invention

[0005] To address the aforementioned issues, this disclosure provides a method, system, storage medium, and electronic device for correcting anchor bolt deviation in wind turbine units.

[0006] This disclosure is achieved through the following technical solution: In a first aspect, embodiments of this disclosure provide a method for correcting anchor bolt deviation in wind turbine units, the method comprising: Obtain the anchor bolt structural parameters of the wind turbine, the target forced displacement of the target anchor bolt, and the target free deflection height, and determine the target additional stress of the target anchor bolt. Obtain the foundation engineering parameters of the annular flange and its corresponding anchor bolt, as well as the external load engineering parameters of the wind turbine, and determine the ultimate tensile force of the external load that the target anchor bolt can withstand. Based on the anchor bolt structural parameters, the external load ultimate tensile force, the target forced displacement of the target anchor bolt, and the target additional stress, the ultimate total stress borne by the target anchor bolt is determined; The ultimate total stress borne by the target anchor is compared with a preset stress threshold to obtain the comparison result. Based on the comparison result, a target anchor deviation correction command is output.

[0007] Furthermore, Determining the target additional stress of the target anchor bolt includes: Based on the elastic modulus, flexural section modulus, target forced displacement, and target free deflection height of the target anchor, the first additional bending moment of the target anchor is determined; the formula for determining the first additional bending moment of the target anchor is: ; in, This represents the first additional bending moment of the target anchor bolt; This indicates the target forced displacement of the target anchor bolt; This represents the elastic modulus of the target anchor bolt; This represents the section modulus of the target anchor bolt in bending. This indicates the target free deflection height of the target anchor bolt; This indicates the diameter of the target anchor bolt; Based on the first additional bending moment of the target anchor and the section modulus of the target anchor, the target additional stress of the target anchor is determined; the formula for determining the target additional stress of the target anchor is: ; in, This indicates the target additional stress of the target anchor bolt; This represents the first additional bending moment of the target anchor bolt; This represents the section modulus of the target anchor bolt in bending.

[0008] Furthermore, The process of obtaining the foundation engineering parameters of the annular flange and corresponding anchor bolts, the external load engineering parameters of the wind turbine, and determining the ultimate tensile force of the target anchor bolt under external load includes: Obtain the stiffness of the annular flange, the number of anchor bolts corresponding to the annular flange, the anchor bolt stiffness, the anchor bolt preload, the combined bending moment at the bottom of the wind turbine tower, the tensile force at the bottom of the wind turbine tower, and the bottom diameter of the wind turbine tower. Based on the number of anchor bolts corresponding to the annular flange, the combined bending moment at the bottom of the wind turbine tower, the tensile force at the bottom of the wind turbine tower, and the bottom diameter of the wind turbine tower, the tensile force of the wind turbine tower wall is determined; the formula for determining the ultimate tensile force of the wind turbine tower wall is: ; in, This indicates the ultimate tensile force on the cylinder wall of the wind turbine unit; This represents the combined bending moment at the base of the wind turbine tower; This indicates the tension at the base of the wind turbine tower; This indicates the diameter of the bottom of the wind turbine tower; This indicates the number of anchor bolts corresponding to the annular flange; Based on the aforementioned annular flange stiffness and anchor bolt stiffness, a stiffness coefficient is determined; the formula for determining the stiffness coefficient is: ; in, Indicates the stiffness coefficient. Indicates the anchor bolt stiffness. Indicates the stiffness of the annular flange; Based on the stiffness coefficient, the anchor preload of the target anchor, and the ultimate tensile force of the wind turbine's casing wall, the ultimate tensile force of the external load borne by the target anchor is determined; the formula for determining the ultimate tensile force of the external load borne by the target anchor is: ; in, This indicates the ultimate tensile force under external load that the target anchor bolt can withstand; This indicates the anchor preload of the target anchor bolt; This indicates the ultimate tensile force on the cylinder wall of the wind turbine unit; This represents the stiffness coefficient.

[0009] Furthermore, The determination of the ultimate total stress borne by the target anchor bolt based on the anchor bolt structural parameters, the ultimate tensile force of the external load, the target forced displacement of the target anchor bolt, and the target additional stress includes: Based on the ultimate tensile force of the external load and the target forced displacement of the target anchor, the second additional bending moment of the target anchor is determined; the formula for determining the second additional bending moment of the target anchor is: ; in, This represents the second additional bending moment of the target anchor bolt; This indicates the ultimate tensile force under external load that the target anchor bolt can withstand; This indicates the target forced displacement of the target anchor bolt; Based on the second additional bending moment of the target anchor, the ultimate tensile force of the external load, the section modulus of the target anchor, the stress cross-sectional area of ​​the target anchor, and the target additional stress of the target anchor, the ultimate total stress borne by the target anchor is determined; the formula for determining the ultimate total stress borne by the target anchor is: ; in, This represents the ultimate total stress borne by the target anchor bolt; This indicates the ultimate tensile force under external load that the target anchor bolt can withstand; This represents the stress cross-sectional area of ​​the target anchor bolt; This represents the second additional bending moment of the target anchor bolt; This represents the section modulus of the target anchor bolt in bending. This indicates the target additional stress of the target anchor bolt.

[0010] Furthermore, The step of comparing the ultimate total stress borne by the target anchor bolt with a preset stress threshold, obtaining a comparison result, and outputting a target anchor bolt deviation correction command based on the comparison result includes: If the comparison result is that the ultimate total stress borne by the target anchor is less than the preset stress threshold, a direct execution command for the target anchor deviation correction will be output. If the comparison result shows that the ultimate total stress borne by the target anchor is greater than the preset stress threshold, the target free deflection height of the target anchor is increased by a preset step size to obtain the next target free deflection height. Based on the anchor structural parameters, the target forced displacement and the next target free deflection height, the next target additional stress of the target anchor is determined.

[0011] Furthermore, The method for correcting anchor bolt deviation in wind turbine units also includes: Acquire acoustic wave transmission data from the ultrasonic sensor set at the first preset test position of the anchor bolt, and temperature data from the temperature compensator set at the second preset test position of the anchor bolt; Based on the relationship between sound wave propagation time and anchor bolt stress, and the sound wave transmission data, combined with the temperature data, the anchor bolt stress data is determined.

[0012] Secondly, based on the same inventive concept, the present disclosure also provides a wind turbine anchor bolt deviation correction system, the system comprising: a first calculation module, a second calculation module, a third calculation module, and an instruction output module; The first calculation module is used to obtain the anchor bolt structural parameters of the wind turbine, the target forced displacement and the target free deflection height of the target anchor bolt, and to determine the target additional stress of the target anchor bolt. The second calculation module is used to obtain the foundation engineering parameters of the annular flange and the corresponding anchor bolt, the external load engineering parameters of the wind turbine, and to determine the ultimate tensile force of the external load that the target anchor bolt can withstand. The third calculation module is used to determine the ultimate total stress borne by the target anchor bolt based on the anchor bolt structural parameters, the external load ultimate tensile force, the target forced displacement of the target anchor bolt, and the target additional stress. The instruction output module is used to compare the ultimate total stress borne by the target anchor bolt with a preset stress threshold, obtain the comparison result, and output a target anchor bolt deviation correction instruction based on the comparison result.

[0013] Furthermore, The system also includes: a data acquisition module and a stress monitoring module; The data acquisition module is used to acquire the acoustic wave transmission data of the ultrasonic sensor set at the first preset test position of the anchor bolt, and the temperature data of the temperature compensator set at the second preset test position of the anchor bolt. The stress monitoring module is used to determine the anchor bolt stress data based on the correspondence between sound wave propagation time and anchor bolt stress, the sound wave transmission data, and the temperature data.

[0014] Thirdly, based on the same inventive concept, the present disclosure also provides a computer-readable storage medium storing one or more programs, which, when executed, can implement the aforementioned wind turbine anchor bolt deviation correction method.

[0015] Fourthly, based on the same inventive concept, embodiments of this disclosure also provide an electronic device, including a processor, a communication interface, the aforementioned computer-readable storage medium, and a communication bus. The processor, communication interface, and computer-readable storage medium communicate with each other via the communication bus. The processor is used to execute a program stored in the aforementioned computer-readable storage medium.

[0016] In this embodiment, the anchor bolt with positional deviation is designated as the target anchor bolt. The target additional stress of the target anchor bolt is determined based on its target forced displacement and target free deflection height. The ultimate tensile force of the external load on the target anchor bolt is determined based on the foundation engineering parameters of the annular flange and the corresponding anchor bolt, and the external load engineering parameters of the wind turbine. The ultimate total stress on the target anchor bolt is determined based on its target additional stress and ultimate tensile force. The ultimate total stress on the target anchor bolt is compared with a preset stress threshold, and based on the comparison result, a target anchor bolt deviation correction command is output. This improves the feasibility of correcting the anchor bolt deviation when aligning the tower bottom annular flange with the anchor bolt, and simultaneously enhances the structural safety of the tower bottom annular flange and the anchor bolt.

[0017] Other features and advantages of this disclosure will be set forth in the description which follows, and will be apparent in part from the description, or may be learned by practicing the disclosure. The objects and other advantages of this disclosure may be realized and obtained by means of the structures pointed out in the description, claims and drawings. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this disclosure or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this disclosure. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of a wind turbine anchor bolt structure provided in an embodiment of the present disclosure; Figure 2 A flowchart of a wind turbine anchor bolt deviation correction method provided in this embodiment of the disclosure; Figure 3 A block diagram of a wind turbine anchor bolt deviation correction system provided in this embodiment of the disclosure. Detailed Implementation

[0020] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this disclosure, and not all embodiments. Based on the embodiments of this disclosure, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this disclosure.

[0021] like Figure 1 As shown, the annular flange (tower T-flange) at the bottom of the wind turbine tower is reliably connected to the ground through multiple anchor bolts embedded in the concrete foundation, ensuring the wind turbine is stably fixed to the ground. The structure of the anchor bolts, from bottom to top, includes: a concrete pad, embedded parts, a lower anchor plate, a lower anchor plate support assembly, high-strength grout, nylon nuts, and an upper anchor plate. The concrete pad, embedded parts, lower anchor plate, and lower anchor plate support assembly are embedded in the concrete foundation. The lower anchor plate is positioned by the lower anchor plate support assembly to correspond with and be in phase with the upper anchor plate. After the lower anchor plate is positioned, the lower anchor plate support assembly and embedded parts are fixed by welding (weld leg size hf=6). The anchor bolts pass through the pre-set holes in the lower anchor plate and are fixed. The high-strength grout is located below the upper anchor plate, while the nylon nut and upper anchor plate are usually located above the concrete foundation. The upper anchor plate and lower anchor plate are in phase, and the angular positions of the pre-set holes on the upper anchor plate and the pre-set holes on the lower anchor plate are perfectly aligned. The anchor bolt passes through the pre-set holes on the upper anchor plate and is fixed with a nylon nut. The height of the anchor bolt above the high-strength grout is the free tilt height.

[0022] During wind turbine installation, multiple anchor bolts are pre-fixed, and then the pre-set holes in the annular flange are sequentially aligned with these anchor bolts. During alignment, deviations may occur between the anchor bolts and the pre-set holes in the annular flange. In this case, external force needs to be applied to align the anchor bolts with the pre-set holes in the annular flange. When this external force is applied to align the anchor bolts with the pre-set holes in the annular flange, the anchor bolts experience additional bending moments. Consequently, the upper and lower sections of the bent anchor bolts experience eccentric stress, and the preload and external tensile force form a couple, further increasing the internal stress of the anchor bolts. Simultaneously, anchor bolts with significant eccentricity may come into contact with the anchor bolt holes in the bottom flange after bending, causing localized stress concentration. The compression and friction between the anchor bolts and the bottom flange can also create initial structural defects, significantly reducing the service life of the anchor bolts and the annular flange. Therefore, it is necessary to determine whether the additional stress generated by the additional bending moments during wind turbine operation will cause the total stress to exceed the pre-set stress threshold, reducing the feasibility of anchor bolt deviation correction and structural safety, while also causing significant eccentricity in the anchor bolts and reducing the service life of the anchor bolts and the annular flange.

[0023] Firstly, Figure 2 A flowchart of a wind turbine anchor bolt deviation correction method provided in this disclosure embodiment is shown below. Figure 2 As shown in the embodiments of this disclosure, a method for correcting anchor bolt deviation in wind turbine units is provided, including: S1: Obtain the anchor bolt structural parameters of the wind turbine, the target forced displacement of the target anchor bolt, and the target free deflection height, and determine the target additional stress of the target anchor bolt; S2: Obtain the foundation engineering parameters of the annular flange and its corresponding anchor bolts, as well as the external load engineering parameters of the wind turbine, and determine the ultimate tensile force of the target anchor bolt under external load. S3: Based on the anchor bolt structural parameters, external load ultimate tensile force, target forced displacement of the target anchor bolt, and target additional stress, determine the ultimate total stress borne by the target anchor bolt; S4: Compare the ultimate total stress borne by the target anchor bolt with the preset stress threshold, obtain the comparison result, and output the target anchor bolt deviation correction command based on the comparison result.

[0024] In this embodiment, the anchor bolt with positional deviation is designated as the target anchor bolt. The target additional stress of the target anchor bolt is determined based on its target forced displacement and target free deflection height. The ultimate tensile force of the external load on the target anchor bolt is determined based on the foundation engineering parameters of the annular flange and the corresponding anchor bolt, and the external load engineering parameters of the wind turbine. The ultimate total stress on the target anchor bolt is determined based on its target additional stress and ultimate tensile force. The ultimate total stress on the target anchor bolt is compared with a preset stress threshold, and based on the comparison result, a target anchor bolt deviation correction command is output. This improves the feasibility of correcting the anchor bolt deviation when aligning the tower bottom annular flange with the anchor bolt, and simultaneously enhances the structural safety of the tower bottom annular flange and the anchor bolt.

[0025] In some examples, the anchor bolt structural parameters include at least: elastic modulus, flexural section modulus, and diameter; the target additional stress of the target anchor bolt is determined, including: S11: Based on the elastic modulus of the target anchor, the flexural section modulus of the target anchor, the target forced displacement of the target anchor, and the target free deflection height, determine the first additional bending moment of the target anchor; the formula for determining the first additional bending moment of the target anchor is: (1) in, This represents the first additional bending moment of the target anchor bolt, which is the bending moment generated when the target anchor bolt is aligned. This represents the target forced displacement of the target anchor bolt, which is the displacement required for the target anchor bolt to complete the deviation correction. This represents the elastic modulus of the target anchor bolt. This represents the section modulus of the target anchor bolt in bending. Indicates the target free deflection height of the target anchor bolt; Indicates the diameter of the target anchor bolt.

[0026] S12: Based on the first additional bending moment of the target anchor and the section modulus of the target anchor, determine the target additional stress of the target anchor; the formula for determining the target additional stress of the target anchor is: (2) in, This indicates the target additional stress of the target anchor bolt, which is the stress generated when the target anchor bolt completes the deviation correction. This indicates the first additional bending moment of the target anchor bolt; This represents the section modulus of the target anchor bolt in bending.

[0027] In this embodiment, the target anchor bolt is an anchor bolt with a positional deviation, requiring the application of external force to correct the deviation. After the external force is applied to the anchor bolt, the anchor bolt bends, generating a first additional torque. With the generation of the first additional torque, the anchor bolt will bear additional stress. As can be seen from formulas (1) and (2), the free skew height is negatively correlated with the first additional bending moment, and the first additional bending moment is positively correlated with the additional stress. Therefore, the free skew height is negatively correlated with the additional stress. The larger the free skew height, the smaller the first additional torque and the additional stress. Therefore, for a target anchor bolt with a positional deviation, the first additional torque and the additional stress generated by deviation correction can be reduced by increasing the free skew height.

[0028] It should be noted that the anchor bolt structural parameters of multiple anchor bolts corresponding to the annular flange are usually the same. However, the anchor bolt structural parameters of some anchor bolts can be set separately according to the actual situation. The anchor bolt structural parameters can be obtained directly from engineering data or calculated by simulation or other methods. No further specific restrictions are made here.

[0029] In some examples, the foundation engineering parameters of the annular flange and its corresponding anchor bolts, and the external load engineering parameters of the wind turbine are obtained to determine the ultimate tensile force of the target anchor bolt under external load, including: S21: Obtain the stiffness of the annular flange, the number of anchor bolts corresponding to the annular flange, the anchor bolt stiffness, the anchor bolt preload, the combined bending moment at the bottom of the wind turbine tower, the tensile force at the bottom of the wind turbine tower, and the bottom diameter of the wind turbine tower.

[0030] S22: Based on the number of anchor bolts corresponding to the annular flange, the combined bending moment at the bottom of the wind turbine tower, the tensile force at the bottom of the wind turbine tower, and the bottom diameter of the wind turbine tower, determine the tensile force on the wind turbine tower wall; the formula for determining the ultimate tensile force on the wind turbine tower wall is: (3) in, This indicates the ultimate tensile force of the wind turbine tower wall, which is the tensile force of the wind turbine tower wall under ultimate load. This indicates the combined bending moment at the base of the wind turbine tower; This indicates the tension at the base of the wind turbine tower; This indicates the diameter of the bottom of the wind turbine tower; This indicates the number of anchor bolts corresponding to the annular flange.

[0031] S23: Based on the stiffness of the annular flange and the anchor bolt stiffness, determine the stiffness coefficient. Based on the stiffness coefficient, the anchor bolt preload of the target anchor bolt, and the ultimate tensile force of the wind turbine's cylinder wall, determine the ultimate tensile force of the external load that the target anchor bolt can withstand. The formula for determining the stiffness coefficient is: (4) in, Indicates the stiffness coefficient. Indicates the anchor bolt stiffness. Indicates the stiffness of the annular flange; The formula for determining the ultimate tensile force of the target anchor bolt under external load is: (5) in, This indicates the ultimate tensile force that the target anchor bolt can withstand under external loads; This indicates the anchor preload of the target anchor bolt; This indicates the ultimate tensile force on the cylinder wall of the wind turbine unit; This represents the stiffness coefficient.

[0032] In this embodiment, the annular flange connection is simplified to a single-anchor bolt segmented model. The wall tension under the ultimate load of the tower is calculated, and then the ultimate tensile force of the external load borne by a single anchor bolt is calculated based on the wall tension. Both the ultimate wall tension and the ultimate tensile force of the external load are extreme values ​​generated during the operation of the wind turbine. During operation, the wind turbine will tilt due to the rotation of the wind turbine and wind force. At this time, the annular flange at the bottom of the tower and multiple anchor bolts need to provide sufficient tension to securely fix the wind turbine in the corresponding position.

[0033] In some examples, the anchor bolt structural parameters also include: stress cross-sectional area; and the ultimate total stress borne by the target anchor bolt is determined based on the anchor bolt structural parameters, the ultimate tensile force of the external load, the target forced displacement of the target anchor bolt, and the target additional stress, including: S31: Based on the ultimate tensile force of the external load and the target forced displacement of the target anchor, determine the second additional bending moment of the target anchor; the formula for determining the second additional bending moment of the target anchor is: (6) in, This represents the second additional bending moment of the target anchor bolt, which is the additional bending moment generated by the couple. This indicates the ultimate tensile force that the target anchor bolt can withstand under external loads; This indicates the target forced displacement of the target anchor bolt.

[0034] S32: Based on the second additional bending moment, the ultimate tensile force of the external load, the section modulus of the bending force of the target anchor bolt, the stress cross-sectional area of ​​the target anchor bolt, and the target additional stress of the target anchor bolt, determine the ultimate total stress borne by the target anchor bolt; the formula for determining the ultimate total stress borne by the target anchor bolt is: (7) in, This represents the ultimate total stress that the target anchor bolt can withstand; This indicates the ultimate tensile force that the target anchor bolt can withstand under external loads; Indicates the stress cross-sectional area of ​​the target anchor bolt; This indicates the second additional bending moment of the target anchor bolt; This represents the section modulus of the target anchor bolt in bending. This indicates the target additional stress of the target anchor bolt.

[0035] In this embodiment, the target anchor bolt with deviation undergoes forced displacement during the correction process. Because the bent anchor bolt is not aligned with the straight line of force, it generates an additional bending moment under external tensile load. Based on the ultimate tensile force of the external load and the forced displacement of the target anchor bolt, a second additional bending moment is determined, which is the limit value of the additional bending moment. Based on the second additional bending moment, the ultimate tensile force of the external load, the section modulus of the target anchor bolt's bending resistance, and the stress cross-sectional area of ​​the target anchor bolt, the ultimate stress borne by the target anchor bolt in the ultimate state is calculated. The ultimate stress differs from the ultimate tensile force of the external load; the ultimate tensile force only includes the external force, while the ultimate stress needs to consider the additional stress generated by the additional bending moment. After determining the ultimate stress, the additional stress generated during the correction process of the target anchor bolt deviation is summed with the ultimate stress to determine the total ultimate stress borne by the target anchor bolt.

[0036] In some examples, the ultimate total stress borne by the target anchor is compared with a preset stress threshold to obtain the comparison result. Based on the comparison result, a target anchor deviation correction command is output, including: S41: If the comparison result shows that the ultimate total stress borne by the target anchor is less than the preset stress threshold, output the direct execution command for the target anchor deviation correction. S42: If the comparison result shows that the ultimate total stress borne by the target anchor is greater than the preset stress threshold, the target free deflection height of the target anchor is increased by a preset step size to obtain the next target free deflection height. Based on the anchor structural parameters, the target forced displacement and the next target free deflection height, the next target additional stress of the target anchor is determined.

[0037] In this embodiment, the preset stress threshold is a safety value in engineering. If the ultimate total stress borne by the anchor bolt exceeds the preset stress threshold, it will cause safety hazards during the operation of the wind turbine. After determining the ultimate total stress borne by the target anchor bolt, the ultimate total stress is compared with the preset stress threshold. If the comparison result shows that the ultimate total stress borne by the target anchor bolt is less than the preset stress threshold, a direct execution command for target anchor bolt deviation correction is output. At this time, an external force can be directly applied to the anchor bolt for deviation correction. For example, if the diameter of the target anchor bolt is 42 mm, the forced displacement of the target anchor bolt is 8 mm, and the free deflection height of the target anchor bolt is 800 mm, the calculated ultimate total stress borne by the target anchor bolt is 845 MPa, and the preset stress threshold is 940 MPa. In this case, the ultimate total stress borne by the target anchor bolt is less than the preset stress threshold, and an external force can be directly applied to the anchor bolt for deviation correction. If the comparison result shows that the ultimate total stress borne by the target anchor is greater than the preset stress threshold, then the ultimate total stress borne by the target anchor needs to be reduced. As can be seen from formulas (1) and (2), the free deflection height of the target anchor is negatively correlated with the target additional stress. By increasing the free deflection height, the target additional stress is reduced, thereby reducing the ultimate total stress of the target anchor. The target free deflection height of the target anchor is increased by a preset step size to obtain the next target free deflection height. Based on the anchor structural parameters, the target forced displacement, and the next target free deflection height, the next target additional stress of the target anchor is determined. Based on the anchor structural parameters, the ultimate tensile force of the external load, the target forced displacement of the target anchor, and the next target additional stress, the next ultimate total stress borne by the target anchor is determined. The next ultimate total stress borne by the target anchor is compared with the preset stress threshold to obtain the comparison result until an ultimate total stress borne by the target anchor and the corresponding target free deflection height are obtained that are less than the preset stress threshold.

[0038] It should be noted that the specific settings of the preset stress threshold and preset step size can be set by those skilled in the art based on the engineering parameters of the wind turbine, the ring flange and the anchor bolt, and no further specific limitations are made here.

[0039] Continue to refer to Figure 1After redetermining the free deflection height that allows the target anchor bolt to withstand a total ultimate stress less than the preset stress threshold, it is necessary to increase the original free deflection height by chiseling high-strength grout and concrete foundation. The specific process includes: chiseling away the concrete in the grouting groove area corresponding to the target anchor bolt, with the chiseling depth being the difference between the redetermined free deflection height and the original free deflection height; during the chiseling process, flexible protective measures are used to protect the anti-corrosion layer of the anchor bolt and the internal steel reinforcement of the foundation to avoid mechanical damage; after the chiseling operation is completed, a soft isolation material with a thickness of not less than 4 mm is evenly wrapped around the outside of all anchor bolts; the deflected anchor bolts are guided using a hand-operated hoist so that their pitch circle diameter meets the installation requirements of the tower; the chiseled concrete surface is fully moistened and cured for no less than 12 hours; after moistening, the surface water of the chiseled surface is removed, and the chiseled area is repaired by pouring concrete of a grade one higher than the original foundation concrete or special grout, ensuring that the interface between the new and old concrete is dense and without gaps.

[0040] In some examples, the wind turbine anchor bolt deviation correction method also includes: S51: Collect the acoustic wave transmission data of the ultrasonic sensor set at the first preset test position of the anchor bolt, and the temperature data of the temperature compensator set at the second preset test position of the anchor bolt. S52: Based on the correspondence between sound wave propagation time and anchor bolt stress, and sound wave transmission data, combined with temperature data, determine the anchor bolt stress data.

[0041] In this embodiment of the disclosure, in order to effectively evaluate whether the strength of the anchor bolt after alignment meets the design standards and to perform safety monitoring, a pre-defined relationship between sound wave propagation time and anchor bolt stress is established, and an ultrasonic sensor and a temperature compensator are set at a pre-defined test location. The ultrasonic sensor is used to capture the time of sound wave propagation and reflection in the anchor bolt; the temperature compensator is used to compensate for the influence of ambient temperature on the sound wave propagation speed and improve the accuracy of monitoring data; a data cable is used to realize data transmission between the ultrasonic sensor, the temperature compensator and the computer terminal.

[0042] Secondly, Figure 3 A block diagram of a wind turbine anchor bolt deviation correction system provided in this disclosure embodiment is shown below. Figure 3 As shown, based on the same inventive concept, this disclosure also provides a wind turbine anchor bolt deviation correction system, including: a first calculation module, a second calculation module, a third calculation module, and an instruction output module.

[0043] The first calculation module is used to obtain the anchor bolt structural parameters of the wind turbine, the target forced displacement and the target free deflection height of the target anchor bolt, and to determine the target additional stress of the target anchor bolt.

[0044] The second calculation module is used to obtain the foundation engineering parameters of the annular flange and the corresponding anchor bolt, the external load engineering parameters of the wind turbine, and to determine the ultimate tensile force of the target anchor bolt under external load.

[0045] The third calculation module is used to determine the ultimate total stress borne by the target anchor bolt based on the anchor bolt structural parameters, the ultimate tensile force of the external load, the target forced displacement of the target anchor bolt, and the target additional stress.

[0046] The command output module is used to compare the ultimate total stress borne by the target anchor bolt with the preset stress threshold, obtain the comparison result, and output the target anchor bolt deviation correction command based on the comparison result.

[0047] In some examples, the wind turbine anchor bolt deviation correction system also includes: a data acquisition module and a stress monitoring module; The data acquisition module is used to acquire the acoustic wave transmission data of the ultrasonic sensor set at the first preset test position of the anchor bolt, and the temperature data of the temperature compensator set at the second preset test position of the anchor bolt.

[0048] The stress monitoring module is used to determine the stress data of the anchor bolt based on the correspondence between sound wave propagation time and anchor bolt stress, as well as sound wave transmission data and temperature data.

[0049] In this embodiment, to effectively assess whether the strength of the anchor bolt after alignment meets the design standards and to perform safety monitoring, a pre-defined relationship between sound wave propagation time and anchor bolt stress is established, and an ultrasonic sensor and a temperature compensator are installed at a pre-defined test location. The ultrasonic sensor captures the propagation and reflection time of sound waves within the anchor bolt; the temperature compensator compensates for the influence of ambient temperature on the sound wave propagation speed, improving the accuracy of the monitoring data; a data cable is used to transmit data between the ultrasonic sensor, temperature compensator, and computer terminal. The computer terminal stores, displays, and analyzes the anchor bolt stress data, and monitors the anchor bolt's operating status in real time. The computer terminal runs a data acquisition module, which also sets anchor bolt parameters, measurement equipment acquisition parameters, and sensor parameters. The stress monitoring module converts the acquired sound wave data into anchor bolt stress data.

[0050] Furthermore, the monitoring system used to monitor the operating status of anchor bolts and determine their stress data is set up and operated as follows: The anchor bolts are stress-calibrated to establish a correlation between sound wave propagation time and anchor bolt stress; the wind turbine is shut down, and the testing personnel attach ultrasonic sensors to the preset test positions on the anchor bolts and complete the connection between the ultrasonic sensors and the data cable and temperature compensator; the data acquisition module is opened on the computer terminal, and the anchor bolt parameters, the acquisition parameters of the measuring equipment, and the sensor parameters are set; the wind turbine is started, the data acquisition module collects and converts sound wave data in real time, and the stress monitoring module determines the real-time stress data of the anchor bolts and displays it visually.

[0051] Thirdly, based on the same inventive concept, the present disclosure also provides a computer-readable storage medium storing one or more programs, which, when executed, can implement the aforementioned wind turbine anchor bolt deviation correction method.

[0052] Fourthly, based on the same inventive concept, embodiments of this disclosure also provide an electronic device, including a processor, a communication interface, the aforementioned computer-readable storage medium, and a communication bus. The processor, communication interface, and computer-readable storage medium communicate with each other via the communication bus. The processor is used to execute a program stored in the aforementioned computer-readable storage medium.

[0053] It should be noted that the electrical connection between the above-mentioned units does not necessarily mean the connection between lines. The indirect connection method can be applied to the embodiments of this disclosure as long as it achieves the purpose of this disclosure.

[0054] Although the present disclosure has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present disclosure.

Claims

1. A method for correcting anchor bolt deviation in wind turbine units, characterized in that, The method includes: Obtain the anchor bolt structural parameters of the wind turbine, the target forced displacement of the target anchor bolt, and the target free deflection height, and determine the target additional stress of the target anchor bolt. Obtain the foundation engineering parameters of the annular flange and its corresponding anchor bolt, as well as the external load engineering parameters of the wind turbine, and determine the ultimate tensile force of the external load that the target anchor bolt can withstand. Based on the anchor bolt structural parameters, the external load ultimate tensile force, the target forced displacement of the target anchor bolt, and the target additional stress, the ultimate total stress borne by the target anchor bolt is determined; The ultimate total stress borne by the target anchor is compared with a preset stress threshold to obtain the comparison result. Based on the comparison result, a target anchor deviation correction command is output.

2. The method according to claim 1, characterized in that, Determining the target additional stress of the target anchor bolt includes: Based on the elastic modulus, flexural section modulus, target forced displacement, and target free deflection height of the target anchor, the first additional bending moment of the target anchor is determined; the formula for determining the first additional bending moment of the target anchor is: ； in, This represents the first additional bending moment of the target anchor bolt; This indicates the target forced displacement of the target anchor bolt; This represents the elastic modulus of the target anchor bolt; This represents the section modulus of the target anchor bolt in bending. This indicates the target free deflection height of the target anchor bolt; This indicates the diameter of the target anchor bolt; Based on the first additional bending moment of the target anchor and the section modulus of the target anchor, the target additional stress of the target anchor is determined; the formula for determining the target additional stress of the target anchor is: ； in, This indicates the target additional stress of the target anchor bolt; This represents the first additional bending moment of the target anchor bolt; This represents the section modulus of the target anchor bolt in bending.

3. The method according to claim 1, characterized in that, The process of obtaining the foundation engineering parameters of the annular flange and corresponding anchor bolts, the external load engineering parameters of the wind turbine, and determining the ultimate tensile force of the external load that the target anchor bolt can withstand includes: Obtain the stiffness of the annular flange, the number of anchor bolts corresponding to the annular flange, the anchor bolt stiffness, the anchor bolt preload, the combined bending moment at the bottom of the wind turbine tower, the tensile force at the bottom of the wind turbine tower, and the bottom diameter of the wind turbine tower. Based on the number of anchor bolts corresponding to the annular flange, the combined bending moment at the bottom of the wind turbine tower, the tensile force at the bottom of the wind turbine tower, and the bottom diameter of the wind turbine tower, the tensile force of the wind turbine tower wall is determined; the formula for determining the ultimate tensile force of the wind turbine tower wall is: ； in, This indicates the ultimate tensile force on the cylinder wall of the wind turbine unit; This represents the combined bending moment at the base of the wind turbine tower; This indicates the tension at the base of the wind turbine tower; This indicates the diameter of the bottom of the wind turbine tower; This indicates the number of anchor bolts corresponding to the annular flange; Based on the aforementioned annular flange stiffness and anchor bolt stiffness, a stiffness coefficient is determined; the formula for determining the stiffness coefficient is: ； in, Indicates the stiffness coefficient. Indicates the anchor bolt stiffness. Indicates the stiffness of the annular flange; Based on the stiffness coefficient, the anchor preload of the target anchor, and the ultimate tensile force of the wind turbine's casing wall, the ultimate tensile force of the external load borne by the target anchor is determined; the formula for determining the ultimate tensile force of the external load borne by the target anchor is: ； in, This indicates the ultimate tensile force under external load that the target anchor bolt can withstand; This indicates the anchor preload of the target anchor bolt; This indicates the ultimate tensile force on the cylinder wall of the wind turbine unit; This represents the stiffness coefficient.

4. The method according to claim 1, characterized in that, The determination of the ultimate total stress borne by the target anchor bolt based on the anchor bolt structural parameters, the ultimate tensile force of the external load, the target forced displacement of the target anchor bolt, and the target additional stress includes: Based on the ultimate tensile force of the external load and the target forced displacement of the target anchor, the second additional bending moment of the target anchor is determined; the formula for determining the second additional bending moment of the target anchor is: ； in, This represents the second additional bending moment of the target anchor bolt; This indicates the ultimate tensile force under external load that the target anchor bolt can withstand; This indicates the target forced displacement of the target anchor bolt; Based on the second additional bending moment of the target anchor, the ultimate tensile force of the external load, the section modulus of the target anchor, the stress cross-sectional area of ​​the target anchor, and the target additional stress of the target anchor, the ultimate total stress borne by the target anchor is determined; the formula for determining the ultimate total stress borne by the target anchor is: ； in, This represents the ultimate total stress borne by the target anchor bolt; This indicates the ultimate tensile force under external load that the target anchor bolt can withstand; This represents the stress cross-sectional area of ​​the target anchor bolt; This represents the second additional bending moment of the target anchor bolt; This represents the section modulus of the target anchor bolt in bending. This indicates the target additional stress of the target anchor bolt.

5. The method according to claim 1, characterized in that, The step of comparing the ultimate total stress borne by the target anchor bolt with a preset stress threshold, obtaining a comparison result, and outputting a target anchor bolt deviation correction command based on the comparison result includes: If the comparison result is that the ultimate total stress borne by the target anchor is less than the preset stress threshold, a direct execution command for the target anchor deviation correction will be output. If the comparison result shows that the ultimate total stress borne by the target anchor is greater than the preset stress threshold, the target free deflection height of the target anchor is increased by a preset step size to obtain the next target free deflection height. Based on the anchor structural parameters, the target forced displacement and the next target free deflection height, the next target additional stress of the target anchor is determined.

6. The method according to claim 1, characterized in that, The method for correcting anchor bolt deviation in wind turbine units also includes: Acquire acoustic wave transmission data from the ultrasonic sensor set at the first preset test position of the anchor bolt, and temperature data from the temperature compensator set at the second preset test position of the anchor bolt; Based on the relationship between sound wave propagation time and anchor bolt stress, and the sound wave transmission data, combined with the temperature data, the anchor bolt stress data is determined.

7. A wind turbine anchor bolt deviation correction system, used to perform the method according to any one of claims 1-6, characterized in that, The system includes: a first arithmetic module, a second arithmetic module, a third arithmetic module, and an instruction output module; The first calculation module is used to obtain the anchor bolt structural parameters of the wind turbine, the target forced displacement and the target free deflection height of the target anchor bolt, and to determine the target additional stress of the target anchor bolt. The second calculation module is used to obtain the foundation engineering parameters of the annular flange and the corresponding anchor bolt, the external load engineering parameters of the wind turbine, and to determine the ultimate tensile force of the external load that the target anchor bolt can withstand. The third calculation module is used to determine the ultimate total stress borne by the target anchor bolt based on the anchor bolt structural parameters, the external load ultimate tensile force, the target forced displacement of the target anchor bolt, and the target additional stress. The instruction output module is used to compare the ultimate total stress borne by the target anchor bolt with a preset stress threshold, obtain the comparison result, and output a target anchor bolt deviation correction instruction based on the comparison result.

8. The system according to claim 7, characterized in that, The system also includes: a data acquisition module and a stress monitoring module; The data acquisition module is used to acquire the acoustic wave transmission data of the ultrasonic sensor set at the first preset test position of the anchor bolt, and the temperature data of the temperature compensator set at the second preset test position of the anchor bolt. The stress monitoring module is used to determine the anchor bolt stress data based on the correspondence between sound wave propagation time and anchor bolt stress, the sound wave transmission data, and the temperature data.

9. A computer-readable storage medium storing one or more programs, characterized in that, When one or more of these programs are executed, the wind turbine anchor bolt deviation correction method according to any one of claims 1-6 can be implemented.

10. An electronic device, comprising a processor, a communication interface, a computer-readable storage medium as described in claim 9, and a communication bus; wherein, The processor, communication interface, and computer-readable storage medium communicate with each other via a communication bus; Its features are, The processor is used to execute programs stored in a computer-readable storage medium.

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