Offshore wind turbine tower deformation measuring and calculating device and method

Abstract

The invention discloses an offshore wind turbine tower deformation measuring and calculating device and method, and relates to the technical field of intelligent monitoring of ocean structure engineering.The offshore wind turbine tower deformation measuring and calculating device is characterized in that a transverse displacement monitoring module is fixedly installed at the outer top of a cabin, a laser monitoring module is adaptively installed in a tower, and the transverse displacement monitoring module and the laser monitoring module are both in signal connection with a monitoring unit; and the monitoring unit gathers monitoring signals of the transverse displacement monitoring module and the laser monitoring module to measure and calculate the deformation of the offshore wind turbine tower. According to the method, the transverse displacement of the tower drum is obtained at the same time through two monitoring means, the displacement values obtained through the two monitoring means are compared and analyzed, calculation errors of the two methods are considered, finally, a tower drum transverse displacement monitoring result is measured and calculated, and an over-limit result is alarmed in time. According to the method, the tower deformation is compared and monitored in real time by using two means, the accuracy of a monitoring result is greatly improved, and errors and interference are avoided.

Description

Technical Field

[0001] The present invention relates to the technical field of intelligent monitoring of marine structure engineering, and more specifically, to a device and method for measuring the deformation of an off - shore wind turbine tower barrel. Background Art

[0002] Wind energy is formed by the uneven heating of the earth's surface by solar radiation. It is a green energy source. Wind power generation can effectively utilize wind energy without damaging the natural environment while obtaining energy. As an important part of green energy, off - shore wind turbines have broad development prospects in terms of market demand, technical characteristics, policy support, etc. Compared with land, the ocean area is vast and wind energy resources are rich, especially in the deep - sea area, the wind energy resources are even richer.

[0003] The tower barrel of a wind turbine is a load - bearing component in the wind power generation unit, mainly playing a supporting role and absorbing the vibration of the unit. The wind speed at sea is often higher than that on land, and the wind direction changes frequently. This unstable wind load causes the tower barrel to bear continuous dynamic stress, resulting in certain amplitude of swaying and twisting deformation of the tower barrel during the operation of the wind power generation unit. Excessive deformation of the tower barrel will affect the normal operation of the wind power generation unit, and in severe cases, it will even cause safety accidents. Therefore, it is necessary to monitor the deformation of the tower barrel in real - time.

[0004] Currently, the deformation monitoring of off - shore wind turbine tower barrels mainly relies on traditional automated monitoring systems. Its core component, the sensor, due to its own limitations, installation errors or insufficient calibration and other factors, limits the accuracy of the collected data. This kind of error has a tendency to gradually amplify with time accumulation, weakening the reliability of the monitoring results. In addition, in the actual application of the automated monitoring system, adverse factors such as electromagnetic field interference and environmental noise in the external environmental conditions may further weaken the stability of the measurement results, leading to deviations or distortions of the monitoring data.

[0005] Therefore, how to propose a device and method for measuring the deformation of an off - shore wind turbine tower barrel, reduce the problem of the difference between the analytical calculation result of the lateral displacement and the actual situation while reducing the error of laser monitoring data, improve the accuracy of the monitoring results, and avoid deviations or distortions of the monitoring data caused by external environmental conditions is an urgent problem to be solved by those skilled in the art. Summary of the Invention

[0006] In view of this, the present invention provides a device and method for measuring the deformation of an off - shore wind turbine tower barrel, which can reduce the problem of the difference between the analytical calculation result of the lateral displacement and the actual situation while reducing the error of laser monitoring data, improve the accuracy of the monitoring results, and avoid deviations or distortions of the monitoring data caused by external environmental conditions. To achieve the above - mentioned purpose, the present invention adopts the following technical solutions: A device for measuring the deformation of an offshore wind turbine tower, comprising: A lateral displacement monitoring module, a laser monitoring module, a monitoring unit, and an offshore wind turbine tower. The offshore wind turbine tower includes a nacelle, a tower, and a working platform that are hermetically connected. The lateral displacement monitoring module is fixedly installed on the outer top of the nacelle, the laser monitoring module is adaptively installed inside the tower, the lateral displacement monitoring module and the laser monitoring module are both signal-connected to the monitoring unit, and the monitoring unit aggregates the monitoring signals of the lateral displacement monitoring module and the laser monitoring module to measure the deformation of the offshore wind turbine tower.

[0007] Optionally, the laser monitoring module includes a laser emitting unit and a photoelectric receiving unit. The laser emitting unit is fixedly installed at the top of the inner wall of the tower, near the connection between the nacelle and the tower; the photoelectric receiving unit is fixedly installed on the working platform at the bottom inside the tower, and the laser emitted by the laser emitting unit is projected onto the center of the photoelectric receiving unit.

[0008] Optionally, the lateral displacement monitoring module includes a wind speed sensing unit, and the wind speed sensing unit is signal-connected to the monitoring unit.

[0009] Optionally, it further includes an offshore wind power monitoring center, and the monitoring unit is placed in the offshore wind power monitoring center.

[0010] Optionally, the laser emitting unit, the photoelectric receiving unit, and the wind speed sensing unit are all data-connected to the monitoring unit in the offshore wind power monitoring center through submarine optical fiber cables.

[0011] Optionally, the monitoring unit is built-in with MATLAB software, and a lateral displacement analysis calculation formula is loaded in the MATLAB software, and the material data and dimensions of the tower are imported as the pre-input parameters in the lateral displacement analysis calculation process for subsequent lateral displacement analysis calculation.

[0012] Optionally, the receiving component of the photoelectric receiving unit is in the shape of a disc, and a circular warning line is provided on the disc. The diameter of the circular warning line is determined according to the tower deformation specification, and the diameter of the disc is n times the diameter of the circular warning line.

[0013] Optionally, it further includes an over-limit alarm system. According to the calculated displacement data, the tower displacement response during the construction stage of the offshore wind turbine and the law of change of the horizontal displacement of the tower under the normal working state of the offshore wind turbine are obtained; an alarm is given according to the received signal of the tower deformation exceeding the limit.

[0014] Optionally, a method for measuring the deformation of an offshore wind turbine tower is applied to any one of the devices for measuring the deformation of an offshore wind turbine tower described above, and includes: Measure the wind force data through the wind speed sensing unit, transmit the wind force data to the monitoring unit, and then the monitoring unit equivalent the transmitted wind force data to the bending moment and shear force applied to the tower barrel. The monitoring unit respectively imports the equivalent bending moment and shear force into the calculation formula carried by the MATLAB software for calculation to obtain the real-time lateral displacement at different heights of the tower barrel. Based on the laser emission unit installed at the top of the inner wall of the tower barrel and the photoelectric receiving unit installed at the bottom of the tower barrel, when the tower barrel deforms, the laser projection position changes and is received by the area around the center point of the photoelectric receiving unit, so as to calculate the distance from the receiving point to the center point, and this distance is the displacement that occurs at the top of the tower barrel. Compare the numerical values of the two results. If the difference between the numerical values of the two results does not exceed 20% of the smaller value of the numerical values of the two results, the final result takes the average value of the two results as the real-time lateral displacement of the tower barrel. If the difference between the numerical values of the two results is greater than 20% of the smaller value of the numerical values of the two results, it is considered that the error of the laser monitoring method is too large, and the final result selects the result based on the analytical calculation of the lateral displacement as the real-time lateral displacement of the tower barrel.

[0015] Optionally, it further includes: when the monitoring results of both monitoring methods exceed the warning line, the monitoring unit gives an alarm; when the monitoring result of the laser monitoring method exceeds the warning line, but the calculation result of the analytical calculation of the lateral displacement does not exceed the warning line, then compare whether the difference between the numerical values of the two results does not exceed 20% of the smaller value of the numerical values of the two results. If it does not exceed 20%, it is necessary to compare whether the average value of the two results exceeds the limit with the lateral deformation limit value; if it is greater than 20%, it is considered that the error of the laser monitoring method is too large, and the final result selects the result based on the analytical calculation of the lateral displacement as the real-time lateral displacement of the tower barrel; when the calculation result of the analytical calculation of the lateral displacement exceeds the warning line, but the monitoring result of the laser monitoring method does not exceed the warning line, then the monitoring unit gives an alarm.

[0016] It can be seen from the above technical solutions that compared with the prior art, the present invention discloses a device and method for measuring the deformation of an offshore wind turbine tower barrel, and has the following beneficial effects: The present invention proposes a device for measuring the deformation of an offshore wind turbine tower barrel, including: a lateral displacement monitoring module, a laser monitoring module, a monitoring unit and a wind turbine tower barrel. The wind turbine tower barrel includes a nacelle, a tower barrel and a working platform that are hermetically connected. The lateral displacement monitoring module is fixedly installed on the outer top of the nacelle, the laser monitoring module is adaptively installed inside the tower barrel, the lateral displacement monitoring module and the laser monitoring module are both signal-connected to the monitoring unit, and the monitoring unit summarizes the monitoring signals of the lateral displacement monitoring module and the laser monitoring module to measure the deformation of the offshore wind turbine tower barrel.

[0017] The present invention is monitored by two different monitoring methods simultaneously, and the two methods are compared for monitoring. The monitoring results have high accuracy. While reducing the error of laser monitoring data, the problem that the analytical calculation result of the lateral displacement is different from the actual situation is reduced. Except for the wind speed sensing unit, other units of the measuring device are placed inside the tower barrel, avoiding damage to the device caused by the harsh marine environment and improving the service life of each unit. It has fewer components, is easy to install, and has low cost. Compared with the traditional automated monitoring system that needs to be installed during the construction of the tower barrel, it only needs to be installed after the construction of the tower barrel is completed, and can even be installed inside the tower barrel of an offshore wind turbine that has been put into use; the transmitted data is simple, which is convenient for the monitoring unit to organize and record, and can provide data reference for the construction of other offshore wind turbines; it can measure the deformation of the tower barrel during the construction of the offshore wind turbine in real time and accurately, as well as the displacement generated by the tower barrel under the normal working state of the offshore wind turbine; when it is detected that the tower barrel has irreversible deformation, the monitoring unit will give an alarm in time. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are only the embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained according to the provided drawings.

[0019] Figure 1 It is a schematic structural diagram of a device for measuring the deformation of an offshore wind turbine tower barrel provided by the present invention.

[0020] Figure 2 It is a schematic flow diagram of a method for measuring the deformation of an offshore wind turbine tower barrel provided by the present invention.

[0021] Among them, 1. Tower barrel; 2. Working platform; 3. Sea level; 4. Laser emission unit; 5. Photoelectric receiving unit; 6. Submarine optical fiber cable; 7. Monitoring unit; 8. Wind speed sensing unit. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0022] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present invention.

[0023] An embodiment of the present invention discloses a device for measuring the deformation of an offshore wind turbine tower barrel, as Figure 1 shown, including: The lateral displacement monitoring module, the laser monitoring module, the monitoring unit 7 and the wind turbine tower. The wind turbine tower includes a nacelle, a tower 1 and a working platform 2 which are hermetically connected. The lateral displacement monitoring module is fixedly installed on the outer top of the nacelle. The laser monitoring module is adaptively installed inside the tower 1. The lateral displacement monitoring module and the laser monitoring module are both signal-connected to the monitoring unit 7. The monitoring unit 7 aggregates the monitoring signals of the lateral displacement monitoring module and the laser monitoring module to calculate the deformation of the offshore wind turbine tower.

[0024] Further, the laser monitoring module includes a laser emitting unit 4 and a photoelectric receiving unit 5. The laser emitting unit 4 is fixedly installed at the top inner wall of the tower 1, near the connection between the nacelle and the tower 1. The photoelectric receiving unit 5 is fixedly installed on the working platform 2 at the bottom inside the tower 1. The laser emitted by the laser emitting unit 4 is projected onto the center of the photoelectric receiving unit 5. The tower 1 is a hollow structure.

[0025] Specifically, the laser emitting unit 4 is perpendicular to the horizontal plane and is fixed to the inner wall of the top of the tower, near the bottom of the connection between the nacelle of the wind turbine and the tower 1, and is not connected to the rotating track of the power generation device. The photoelectric receiving unit 5 is parallel to the horizontal plane and is fixed on the working platform 2 at the bottom inside the tower 1. The laser emitted by the laser emitting unit 4 is projected onto the center of the photoelectric receiving unit 5. The wind speed sensing unit 8 is placed on the outer top of the offshore wind turbine.

[0026] Further, the lateral displacement monitoring module includes a wind speed sensing unit 8, and the wind speed sensing unit 8 is signal-connected to the monitoring unit 7.

[0027] Further, it further includes an offshore wind power monitoring center, and the monitoring unit 7 is placed in the offshore wind power monitoring center.

[0028] Further, the laser emitting unit 4, the photoelectric receiving unit 5 and the wind speed sensing unit 8 are all data-connected to the monitoring unit 7 in the offshore wind power monitoring center through the submarine optical fiber cable 6 to transmit data in real time.

[0029] Further, the monitoring unit 7 has MATLAB software installed. A program for lateral displacement analysis and calculation is loaded in the MATLAB software. The material data and dimensions of the tower are imported as the pre-input parameters in the process of lateral displacement analysis and calculation for subsequent lateral displacement analysis and calculation. The monitoring unit equates the transmitted real-time wind force data to the bending moment and shear force applied to the tower, and imports them into the lateral displacement analysis calculation formula loaded in the MATLAB software to calculate the real-time lateral displacement at different heights. At the same time, the monitoring unit 7 needs to set limit values and an over-limit alarm system, and its limit values are determined based on the relevant specifications for tower deformation.

[0030] In the specific implementation manner, the formula used in the lateral displacement analysis and calculation program is as follows: ; ; ; ; ; ; ; wherein, formula (1) is the general solution of the dynamic control equation of, cosh(x) and sinh(x) are hyperbolic functions, O 1 、O 2 、O 3 、O 4 、 are undetermined coefficients; i is the imaginary unit; is the elastic modulus of the tower barrel material; is the complex elastic modulus of the tower barrel material; is the hysteretic damping of the tower barrel material; is the moment of inertia of the cross-section of the tower barrel structure; is the mass per unit length of the tower barrel; Z is the height of the tower barrel; is the height at any point of the tower barrel; are the bending moment, shear force, and load frequency applied to the tower barrel, respectively.

[0031] Furthermore, the receiving component of the photoelectric receiving unit 5 is in the shape of a disc, and a circular warning line is provided on the disc. The diameter of the circular warning line is determined according to the tower barrel deformation specification, and the diameter of the disc is n times the diameter of the circular warning line, preferably 1.5 times.

[0032] Furthermore, a limit value of the lateral displacement and an over-limit alarm system are set in the monitoring unit 7. The limit value is determined by the relevant tower barrel deformation specifications. The over-limit alarm system obtains the tower barrel displacement response during the construction stage of the offshore wind turbine and the variation law of the horizontal displacement of the tower barrel under the normal working state of the offshore wind turbine according to the calculated displacement data; and alarms according to the signal of receiving the over-limit deformation of the tower barrel.

[0033] In a specific embodiment, a method for measuring the deformation of an offshore wind turbine tower barrel is applied to any one of the above-mentioned devices for measuring the deformation of an offshore wind turbine tower barrel, as Figure 2 shown, and includes: Step 1: Layout of the monitoring unit 7 and settings for the analytical calculation of lateral displacement: The monitoring unit 7 is placed in the offshore monitoring center; the software for the analytical calculation of lateral displacement is MATLAB software, and a program for the analytical calculation of lateral displacement is written in MATLAB software; the material properties and structural dimensions of the offshore wind turbine tower are collected, and these data are imported into the displacement calculation program written in MATLAB software; finally, the limit value of lateral displacement and the over-limit alarm system are set in the monitoring unit 7, and this limit value is determined by the relevant specifications for tower deformation; Step 2: Determine the relevant data of the receiving component of the photoelectric receiving unit 5: The shape of the receiving component of the photoelectric receiving unit 5 is a disc, and a circular warning line is provided on the disc. The diameter of this circular warning line is determined based on the relevant specifications for tower deformation, and the diameter of the disc is set to 1.5 times the diameter of the circular warning line; Step 3: Layout of the laser emitting unit 4, the photoelectric receiving unit 5 and the wind speed sensing unit 8: The laser emitting unit 4 is installed at the topmost part of the inner wall of the tower, at the bottom of the connection with the nacelle of the wind turbine, and is attached to the inner wall of the tower 1; according to the position of the laser emitting unit 4, the photoelectric receiving unit 5 is installed at the bottom of the tower 1 to ensure that in the initial state of the tower 1, the laser emitted by the laser emitting unit 4 falls on the center of the photoelectric receiving unit 5, and thus the initial state of the monitoring device is determined; the wind speed sensing unit 8 is placed at the top of the offshore wind turbine; the laser emitting unit 4, the photoelectric receiving unit 5 and the wind speed sensing unit 8 are connected to the monitoring unit 7 in the offshore monitoring center through the submarine optical fiber cable 6 to form a monitoring system; Step 4: Measurement, two monitoring methods are used simultaneously for calculation. One is analytical calculation. First, the wind force data measured by the wind speed sensing unit 8 are transmitted to the monitoring unit 7, and then the monitoring unit converts the transmitted wind force data into the bending moment and shear force applied to the tower. Finally, the monitoring unit 7 respectively imports the equivalent bending moment and shear force into the program written in MATLAB software to carry out the calculation to obtain the real-time lateral displacement at different heights of the tower 1; the other is laser monitoring. Based on the laser emitting unit 4 installed at the top of the inner wall of the tower 1 and the photoelectric receiving unit 5 installed at the bottom of the tower, when the tower 1 deforms, the projection position of the laser changes and is received by the area around the center point of the photoelectric receiving unit 5, so that the distance from the receiving point to the center point can be calculated, and this distance is the displacement that occurs at the top of the tower; Step 5: Compare and determine the final result. After obtaining the results of the tower lateral displacement of the two monitoring methods, the numerical values of the two results are compared. If the difference between the numerical values of the two results does not exceed 20% of the smaller value of the numerical values of the two results, in order to improve the accuracy of the result, the final result takes the average value of the two results as the real-time lateral displacement of the tower 1; if the difference between the numerical values of the two results is greater than 20% of the smaller value of the numerical values of the two results, it is considered that the error of the laser monitoring method is too large, and the final result selects the result based on the analytical calculation of lateral displacement as the real-time lateral displacement of the tower 1.

[0034] Step 6: When U Z > , the monitoring device based on the analytical calculation of the lateral displacement will give an alarm in a timely manner; when the laser is received at a position outside the warning line of the photoelectric receiving unit, the laser monitoring device will give an alarm in a timely manner. The warning lines of both monitoring methods are determined according to the relevant specifications of the tower barrel deformation, and the lateral deformation limit values are the same. When the monitoring results of both monitoring methods exceed the warning line, the monitoring unit 7 will give an alarm in a timely manner. When the monitoring result of the laser monitoring method exceeds the warning line, but the calculated result U of the analytical calculation of the lateral displacement Z does not exceed the warning line, it is necessary to compare whether the difference between the two result values does not exceed 20% of the smaller value of the two result values. If it does not exceed 20%, it is necessary to compare whether the average value of the two results exceeds the lateral deformation limit; if it is greater than 20%, it is considered that the error of the laser monitoring method is too large. When the calculated result U of the analytical calculation of the lateral displacement Z > exceeds the warning line, but the monitoring result of the laser monitoring method does not exceed the warning line, the monitoring unit 7 will give an alarm in a timely manner; Step 7: Based on the finally obtained real-time displacement data, the displacement response of the tower barrel during the construction stage of the offshore wind turbine can be obtained, as well as the variation law of the horizontal displacement of the tower barrel under the normal working state of the offshore wind turbine; at the same time, a signal of excessive deformation of the tower barrel 1 is received in a timely manner and a quick response is made.

[0035] The various embodiments in this specification are described in a progressive manner. Each embodiment focuses on the differences from other embodiments. The same or similar parts among the various embodiments can be referred to each other. For the device disclosed in the embodiment, since it corresponds to the method disclosed in the embodiment, the description is relatively simple, and the relevant parts can be referred to the description of the method part.

[0036] The above description of the disclosed embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be obvious to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to these embodiments shown herein, but will be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for measuring deformation of an offshore wind turbine tower, characterized in that: include: A lateral displacement monitoring module, a laser monitoring module, a monitoring unit and a wind turbine tower, wherein the wind turbine tower comprises a sealed and connected cabin, a tower and a working platform, the lateral displacement monitoring module is fixedly mounted on the top outside the cabin, the laser monitoring module is adapted to be mounted inside the tower, the lateral displacement monitoring module and the laser monitoring module are both signal-connected to the monitoring unit, and the monitoring unit aggregates the monitoring signals of the lateral displacement monitoring module and the laser monitoring module to measure the deformation of the offshore wind turbine tower.

2. The offshore wind turbine tower deformation measuring device according to claim 1, characterized in that: The laser monitoring module includes a laser emitting unit and a photoelectric receiving unit. The laser emitting unit is fixedly installed on the top of the inner wall of the tower; the photoelectric receiving unit is fixedly installed on the working platform at the bottom of the tower, and the laser emitted by the laser emitting unit is projected onto the center of the photoelectric receiving unit.

3. The offshore wind turbine tower deformation measuring device according to claim 1, characterized in that: The lateral displacement monitoring module includes a wind speed sensing unit, and the wind speed sensing unit is signal-connected to the monitoring unit.

4. The offshore wind turbine tower deformation measuring device according to claim 1, characterized in that: It also includes an offshore wind power monitoring center, and the monitoring unit is placed in the offshore wind power monitoring center.

5. The offshore wind turbine tower deformation measuring device according to claim 2, characterized in that: The laser emitting unit, the photoelectric receiving unit and the wind speed sensing unit are all connected to the monitoring unit in the offshore wind power monitoring center through a submarine optical fiber cable.

6. The offshore wind turbine tower deformation measuring device according to claim 1, characterized in that: The monitoring unit has built-in MATLAB software, which is equipped with a lateral displacement analytical calculation formula, and imports material data and dimensions of the tower as pre-input parameters in the lateral displacement analytical calculation process for subsequent lateral displacement analytical calculation.

7. The offshore wind turbine tower deformation measuring device according to claim 2, characterized in that: The receiving component of the photoelectric receiving unit is in the shape of a disk, on which a circular warning line is arranged. The diameter of the circular warning line is determined according to the tower deformation specification, and the diameter of the disk is n times the diameter of the circular warning line.

8. The offshore wind turbine tower deformation measuring device according to claim 1, characterized in that: It also includes an over-limit alarm system, which obtains the tower displacement response during the construction phase of the offshore wind turbine and the change law of the tower horizontal displacement under normal working conditions of the offshore wind turbine based on the calculated displacement data; and issues an alarm based on the signal that the tower deformation exceeds the limit.

9. A method for calculating deformation of an offshore wind turbine tower, applied to an offshore wind turbine tower deformation calculating device as claimed in any one of claims 1 to 8, characterized in that: include: The wind data is measured by the wind speed sensor unit and transmitted to the monitoring unit. The monitoring unit then converts the transmitted wind data into equivalent bending moment and shear force applied to the tower. The monitoring unit imports the equivalent bending moment and shear force into the calculation formula of the MATLAB software for calculation, and obtains the real-time lateral displacement of the tower at different heights. Based on the laser emitting unit installed at the top of the inner wall of the tower and the photoelectric receiving unit installed at the bottom of the tower, the laser projection position changes when the tower is deformed, and is received by the area around the center point of the photoelectric receiving unit, so as to calculate the distance from the receiving point to the center point, which is the displacement of the top of the tower; Compare the values ​​of the two results. If the difference between the two results does not exceed 20% of the smaller value of the two results, the average value of the two results is taken as the real-time lateral displacement of the tower. If the difference between the two result values ​​is greater than 20% of the smaller value of the two result values, it is considered that the error of the laser monitoring method is too large, and the final result based on the lateral displacement analytical calculation is selected as the real-time lateral displacement of the tower.

10. The method for calculating the deformation of an offshore wind turbine tower according to claim 9, characterized in that: Also includes: When the monitoring results of both monitoring methods exceed the warning line, the monitoring unit will sound an alarm; When the monitoring result of the laser monitoring method exceeds the warning line, but the calculation result of the lateral displacement analytical calculation does not exceed the warning line, the difference between the two result values ​​is compared to see if it does not exceed 20% of the smaller value of the two result values. If it does not exceed 20%, the average value of the two results is taken to compare with the lateral deformation limit to see if it exceeds the limit; if it is greater than 20%, it is considered that the error of the laser monitoring method is too large, and the final result uses the result based on the lateral displacement analytical calculation as the real-time lateral displacement of the tower; when the calculation result of the lateral displacement analytical calculation exceeds the warning line, but the monitoring result of the laser monitoring method does not exceed the warning line, the monitoring unit will alarm.

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