Evaluation method and system for structural stability of floating type wind power blade

Abstract

The invention discloses a method and a system for evaluating the structural stability of a floating wind power blade. The method comprises the following steps: drawing a three-dimensional geometric shape of the blade; creating a blade finite element model according to the blade structure design drawing and the material test report; inputting a limit load borne by the blade under the condition of considering the wind wave flow coupling effect, and obtaining a buckling characteristic load value of the blade; determining a reduction coefficient of the structural stability by referring to a blade design standard, and calculating a structural stability safety coefficient of the blade under a real environment condition; and finally, judging whether the blade structure stability design meets the standard requirement. The system comprises a blade modeling module, a finite element simulation module, a safety coefficient calculation module and a judgment module. According to the method, the structural stability and safety in the early design stage of the floating type wind power blade can be conservatively calculated, the dangerous position where the blade is bent can be efficiently determined, and safe and reliable design of the blade is facilitated.

Description

Technical Field

[0001] The present invention belongs to the technical field of new energy wind power generation, and in particular relates to a method and system for evaluating the structural stability of a floating wind turbine blade. Background Art

[0002] As onshore and offshore wind resources are exhausted, wind power is developing towards deep sea areas with abundant resources and good development environment. Floating foundations are currently the best choice for developing wind power 50km away from the coastline. At present, the development of floating wind power in various countries around the world has gradually moved from demonstration prototypes to commercialization. Considering that floating foundations are subject to multiple loads brought by waves, currents, and ice movement, high safety design requirements are placed on various components of the unit. At the same time, considering various factors such as the complex environment of deep sea areas and the difficulty of operation and maintenance, the structural strength design of the blades must meet the requirements, especially its structural stability. At present, in order to reduce costs in the wind power field, the weight of blades has been repeatedly reduced, and the structural design has also adopted a sporadic reinforcement method, which is very likely to cause insufficient structural stability and cannot withstand the extreme loads under special working conditions in deep sea areas, resulting in cracking or breaking of blades, which brings great insecurity and investment costs. Therefore, it is necessary to develop a structural stability evaluation method and system with simple calculation method, high recognition and conservative results. Summary of the invention

[0003] The present invention provides a method and system for evaluating the structural stability of floating wind turbine blades, the purpose of which is to improve the safety and stability of floating wind turbine blades and effectively reduce various problems that may occur during operation.

[0004] In order to achieve the above object, the present invention adopts the following technical solution:

[0005] A method for evaluating the structural stability of a floating wind turbine blade comprises:

[0006] According to the aerodynamic shape data of the blade, a three-dimensional geometric shape diagram of the blade is established;

[0007] According to the three-dimensional geometric shape of the blade, the structural design of the blade and the mechanical performance parameters of the blade material are input to build a finite element model of the blade;

[0008] According to the constructed blade finite element model, the ultimate load data of the blade of the floating unit under the wind-wave-current coupling effect is input to obtain the buckling characteristic value of the blade under the corresponding load condition;

[0009] According to the obtained buckling characteristic value of the blade under the corresponding load conditions and in combination with the blade design standards, the safety factor of the blade structure stability is calculated;

[0010] Based on the calculated safety factor of blade structure stability, the design of floating wind turbine blades is evaluated to see whether it meets the standards.

[0011] A further improvement of the present invention is that, based on the aerodynamic shape data of the blade, a three-dimensional geometric shape diagram of the blade is established, including:

[0012] According to the design geometric information of the floating wind turbine blade, including blade length, airfoil model of each section of the blade, airfoil geometric data, chord length, twist angle and pre-bending information, a three-dimensional geometric shape diagram of the blade is constructed.

[0013] A further improvement of the present invention is that, according to the three-dimensional geometric shape of the blade, the structural design drawing of the blade and the mechanical performance parameters of the blade material are input to construct a finite element model of the blade, including:

[0014] According to the three-dimensional geometric shape of the blade and the design drawings of the wind turbine blade structure, the ply information is set at the corresponding position of the blade, including the quantity, start and end positions and corresponding thickness of the materials, to obtain the structural model of the blade. The ply information includes glass fiber cloth, carbon pultruded board, Balsa, PVC and structural adhesive.

[0015] According to the structural model of the blade, the mechanical property parameters corresponding to each material are input, including transverse tensile modulus, longitudinal tensile modulus, Poisson's ratio, in-plane shear modulus and out-of-plane shear modulus, and the finite element model of the blade is constructed.

[0016] A further improvement of the present invention is that, based on the constructed blade finite element model, the limit load data of the blade of the floating unit under the consideration of wind-wave-current coupling is input to obtain the buckling characteristic value of the blade under the corresponding load condition, including:

[0017] According to the finite element model of the blade, the ultimate load data of the blade under the coupling of wind, wave and current are applied to the main beam position on the windward and leeward sides of the blade. The structural failure data of the blade is calculated using structural simulation software. The loading method of the ultimate load data is unevenly distributed concentrated force.

[0018] According to the blade structure failure data calculated by simulation, the characteristic load value of the blade under the actual failure state is extracted.

[0019] A further improvement of the present invention is that, based on the obtained buckling characteristic value of the blade under the corresponding load condition and in combination with the blade design standard, the safety factor of the blade structure stability is calculated, including:

[0020] According to the blade design standards GL2010, DNVGL-ST-0376:2015 and IEC 61400-5:2020, the reduction factor for structural stability verification is determined taking into account the influence of operating temperature, environmental aging, manufacturing tolerance and analysis method;

[0021] According to the obtained reduction factor of the structural stability check, the structural stability safety factor of the blade is calculated, and the formula is as follows:

[0022]

[0023] GAMA buckle represents the safety factor of blade structure stability, and F represents the blade buckling characteristic value.

[0024] A further improvement of the present invention is to evaluate whether the floating wind turbine blade design meets the standard based on the calculated safety factor of the blade structure stability, including:

[0025] If the safety factor f of the blade structure stability is ≥ 1, it means that the safety factor of the blade structure adhesive meets the requirements and the structural strength meets the standards;

[0026] If the safety factor f of the blade structural stability is less than 1, it means that the safety factor of the blade structural adhesive does not meet the requirements and the structural stability does not meet the standards.

[0027] A floating wind turbine blade structural stability assessment system, comprising:

[0028] The blade three-dimensional module creates a three-dimensional geometric shape diagram of the blade based on the aerodynamic shape data of the blade;

[0029] The blade modeling module constructs a blade finite element model based on the blade's three-dimensional geometric shape, inputs the blade's structural design drawing and the blade's material mechanical performance parameters;

[0030] The finite element simulation module uses the constructed blade finite element model to input the ultimate load data of the blades of the floating unit under the coupling of wind, wave and current, and obtains the buckling characteristic value of the blades under the corresponding load conditions;

[0031] The safety factor calculation module calculates the safety factor of the blade structure stability based on the obtained buckling characteristic value of the blade under the corresponding load conditions and in combination with the blade design standards;

[0032] The judgment module evaluates whether the floating wind turbine blade design meets the standards based on the calculated safety factor of the blade structure stability.

[0033] A further improvement of the present invention is that, in the blade three-dimensional module, a blade three-dimensional geometric shape diagram is established according to the aerodynamic shape data of the blade, including:

[0034] According to the design geometric information of the floating wind turbine blade, including blade length, airfoil model of each section of the blade, airfoil geometric data, chord length, twist angle and pre-bending information, a three-dimensional geometric shape diagram of the blade is constructed.

[0035] A further improvement of the present invention is that, in the blade modeling module, according to the three-dimensional geometric shape of the blade, the structural design drawing of the blade and the mechanical performance parameters of the blade material are input to construct a blade finite element model, including:

[0036] According to the three-dimensional geometric shape of the blade and the design drawings of the wind turbine blade structure, the ply information is set at the corresponding position of the blade, including the quantity, start and end positions and corresponding thickness of the materials, to obtain the structural model of the blade. The ply information includes glass fiber cloth, carbon pultruded board, Balsa, PVC and structural adhesive.

[0037] According to the structural model of the blade, the mechanical property parameters corresponding to each material are input, including transverse tensile modulus, longitudinal tensile modulus, Poisson's ratio, in-plane shear modulus and out-of-plane shear modulus, and the finite element model of the blade is constructed.

[0038] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the computer program implements the steps of a method for evaluating the structural stability of a floating wind turbine blade.

[0039] Compared with the prior art, the present invention has at least the following beneficial technical effects:

[0040] The present invention provides a method and system for evaluating the structural stability of a floating wind turbine blade. Combined with the design standards for wind turbine blades, a method and system for evaluating the structural stability of floating offshore wind turbine blades with a simple calculation method, high recognition and conservative results are developed for the loading conditions of floating offshore wind turbine blades under complex wind loads, wave loads, ice loads and other sea conditions. According to the actual operation of floating wind turbine blades, the influence of temperature, environmental aging and manufacturing error factors that the blades may be subjected to on their own strength during the design, manufacturing and operation stages is considered, and the total reduction factor is determined; at the same time, the characteristic load coefficient of the blade under a specific load condition is calculated using finite element simulation software, and the safety factor of the blade is evaluated based on the influencing factors of each parameter. The final result is concise and intuitive, and the parts that do not meet the blade design standards can be directly reinforced or modified, which is of great significance to ensuring the safety of the blades during the design stage. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] In order to more clearly illustrate the specific implementation methods of the present invention or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0042] Figure 1 It is a schematic diagram of load distribution under the maximum flapping condition of the blade;

[0043] Figure 2 Schematic diagram of the floating wind turbine blade structural stability assessment system. DETAILED DESCRIPTION

[0044] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present invention. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0045] It should be understood that when used in this specification and the appended claims, the terms "include" and "comprises" indicate the presence of described features, integers, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or combinations thereof.

[0046] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, the singular forms "a", "an" and "the" are intended to include plural forms unless the context clearly indicates otherwise.

[0047] It should be further understood that the term "and / or" used in the present description and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes these combinations.

[0048] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0049] The embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0050] Example 1

[0051] The present invention provides a method for evaluating the structural stability of a floating wind turbine blade, comprising:

[0052] According to the aerodynamic shape data of the blade, a three-dimensional geometric shape diagram of the blade is established;

[0053] According to the three-dimensional geometric shape of the blade, the structural design of the blade and the mechanical performance parameters of the blade material are input to build a finite element model of the blade;

[0054] According to the constructed blade finite element model, the ultimate load data of the blade of the floating unit under the wind-wave-current coupling effect is input to obtain the buckling characteristic value of the blade under the corresponding load condition;

[0055] According to the obtained buckling characteristic value of the blade under the corresponding load conditions and in combination with the blade design standards, the safety factor of the blade structure stability is calculated;

[0056] Based on the calculated safety factor of blade structure stability, the design of floating wind turbine blades is evaluated to see whether it meets the standards.

[0057] In this embodiment, a three-dimensional geometric shape diagram of the blade is established based on the aerodynamic shape data of the blade, including:

[0058] According to the design geometric information of the floating wind turbine blade, including blade length, airfoil model of each section of the blade, airfoil geometric data, chord length, twist angle and pre-bending information, a three-dimensional geometric shape diagram of the blade is constructed.

[0059] In this embodiment, according to the three-dimensional geometric shape of the blade, the structural design drawing of the blade and the mechanical performance parameters of the blade material are input to construct a finite element model of the blade, including:

[0060] According to the three-dimensional geometric shape of the blade and the design drawings of the wind turbine blade structure, the ply information is set at the corresponding position of the blade, including the quantity, start and end positions and corresponding thickness of the materials, to obtain the structural model of the blade. The ply information includes glass fiber cloth, carbon pultruded board, Balsa, PVC and structural adhesive.

[0061] According to the structural model of the blade, the mechanical property parameters corresponding to each material are input, including transverse tensile modulus, longitudinal tensile modulus, Poisson's ratio, in-plane shear modulus and out-of-plane shear modulus, and the finite element model of the blade is constructed.

[0062] In this embodiment, according to the constructed blade finite element model, the ultimate load data of the blade of the floating unit under the wind-wave-current coupling is input to obtain the buckling characteristic value of the blade under the corresponding load condition, including:

[0063] According to the finite element model of the blade, the ultimate load data of the blade under the coupling of wind, wave and current are applied to the main beam position on the windward and leeward sides of the blade. The structural failure data of the blade is calculated using structural simulation software. The loading method of the ultimate load data is unevenly distributed concentrated force.

[0064] According to the blade structure failure data calculated by simulation, the characteristic load value of the blade under the actual failure state is extracted.

[0065] In this embodiment, the safety factor of the blade structure stability is calculated based on the obtained buckling characteristic value of the blade under the corresponding load condition and in combination with the blade design standard, including:

[0066] According to the blade design standards GL2010, DNVGL-ST-0376:2015 and IEC 61400-5:2020, the reduction factor for structural stability verification is determined taking into account the influence of operating temperature, environmental aging, manufacturing tolerance and analysis method;

[0067] According to the obtained reduction factor of the structural stability check, the structural stability safety factor of the blade is calculated, and the formula is as follows:

[0068]

[0069] GAMA buckle represents the safety factor of blade structure stability, and F represents the blade buckling characteristic value.

[0070] In this embodiment, based on the calculated safety factor of blade structure stability, evaluating whether the floating wind turbine blade design meets the standard includes:

[0071] If the safety factor f of the blade structure stability is ≥ 1, it means that the safety factor of the blade structure adhesive meets the requirements and the structural strength meets the standards;

[0072] If the safety factor f of the blade structural stability is less than 1, it means that the safety factor of the blade structural adhesive does not meet the requirements and the structural stability does not meet the standards.

[0073] Example 2

[0074] The present invention provides a method for evaluating the structural stability of a floating wind turbine blade, comprising:

[0075] Step 1: Input the blade design geometry information, including blade length, airfoil model of each section of the blade, airfoil geometry data, airfoil chord length, twist angle and pre-bend, and construct the blade geometry appearance diagram;

[0076] Step 2: Based on the blade geometry obtained in step 1 and the blade structure layup design drawing, lay up the blade, including glass fiber cloth (uniaxial cloth, biaxial cloth and triaxial cloth), carbon fiber pultruded board, core material (BALSA, PVC, PET) and structural adhesive. Lay the blade at the corresponding position according to the drawing information, ensure the accuracy of the starting position, quantity and material thickness data, and restore the main structure of the blade;

[0077] Step 3: Based on the blade structure in step 3, input the basic mechanical properties parameters of the materials used in the blade design, including the transverse tensile modulus E 1 , longitudinal tensile modulus E 2 , in-plane shear modulus G 12 , out-of-plane shear modulus G 13 and G 23 , and the Poisson coupling coefficient V 12 , construct the blade finite element model, where Table 1 shows the name of the material used for the blade and the corresponding mechanical performance parameters;

[0078] Table 1 Mechanical properties parameters of blade materials

[0079]

[0080]

[0081] Step 4: Process the blade load data of floating wind turbines under the coupling of wind, wave and current. The data on the main beams on the windward and leeward sides of the blades bear the ultimate load in the maximum flapping direction (in the form of concentrated force). The load is divided into loads in the blade flapping and swinging directions. The distribution along the blade length is as follows: Figure 1 As shown;

[0082] Step 5: Use finite element simulation software to perform buckling analysis on the blade stress model in step 4 to obtain blade structure failure data, including characteristic loads and dangerous section data;

[0083] Step 6: According to the calculation results of step 5, extract the characteristic load value F=2.57 under the real failure state of the blade, where the real failure means that the blade will form a continuous and smooth concave and convex surface when it is buckled, and the characteristic load data of the blade that is very convex locally can be excluded;

[0084] Step 7: Refer to GL2010, DNVGL-ST-0376:2015 and IEC 61400-5:2020 international standards for blade design, consider the impact of actual conditions such as the accuracy of the analysis method, material aging, human errors and manufacturing tolerances on blade safety during the design, manufacturing and operation of the blade, and determine the most conservative structural stability safety factor, GAMA buckle =2.376;

[0085] Step 8: Based on the characteristic load data extracted in step 6 and the reduction factor of the structural stability determined in step 7, calculate the safety factor f=1.08 of the blade structural stability with reference to formula (1);

[0086] Step 9: The safety factor of blade structure stability obtained in step 8 is greater than 1, indicating that the structural stability of the blade meets the design standards.

[0087] Example 3

[0088] like Figure 2 As shown, the present invention provides a floating wind turbine blade structural stability evaluation system, comprising:

[0089] The blade three-dimensional module creates a three-dimensional geometric shape diagram of the blade based on the aerodynamic shape data of the blade;

[0090] The blade modeling module constructs a blade finite element model based on the blade's three-dimensional geometric shape, inputs the blade's structural design drawing and the blade's material mechanical performance parameters;

[0091] The finite element simulation module uses the constructed blade finite element model to input the ultimate load data of the blades of the floating unit under the coupling of wind, wave and current, and obtains the buckling characteristic value of the blades under the corresponding load conditions;

[0092] The safety factor calculation module calculates the safety factor of the blade structure stability based on the obtained buckling characteristic value of the blade under the corresponding load conditions and in combination with the blade design standards;

[0093] The judgment module evaluates whether the floating wind turbine blade design meets the standards based on the calculated safety factor of the blade structure stability.

[0094] Example 4

[0095] The present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for evaluating the structural stability of a floating wind turbine blade are implemented.

[0096] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0097] The present application is described with reference to the flowcharts and / or block diagrams of the methods, systems and computer program products according to the embodiments of the present application. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of the processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A system that specifies the functions of a box or multiple boxes.

[0098] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0099] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process in the computer or other programmable device. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0100] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. It is obvious to those skilled in the art that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is defined by the attached claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention. Any figure mark in the claims should not be regarded as limiting the claims involved.

[0101] In addition, it should be understood that although this specification is described in accordance with the implementation modes, not every implementation mode contains only one independent technical solution. This description of the specification is only for the sake of clarity. Those skilled in the art should regard the specification as a whole. The technical solutions in each embodiment can also be appropriately combined to form other implementation modes that can be understood by those skilled in the art. The above content is only to illustrate the technical idea of ​​the present invention, and cannot be used to limit the protection scope of the present invention. Any changes made on the basis of the technical solution according to the technical idea proposed by the present invention shall fall within the protection scope of the claims of the present invention.

Claims

1. A method for evaluating the structural stability of a floating wind turbine blade, characterized in that: include: According to the aerodynamic shape data of the blade, a three-dimensional geometric shape diagram of the blade is established; According to the three-dimensional geometric shape of the blade, the structural design of the blade and the mechanical performance parameters of the blade material are input to build a finite element model of the blade; According to the constructed blade finite element model, the ultimate load data of the blade of the floating unit under the wind-wave-current coupling effect is input to obtain the buckling characteristic value of the blade under the corresponding load condition; According to the obtained buckling characteristic value of the blade under the corresponding load conditions and in combination with the blade design standards, the safety factor of the blade structure stability is calculated; Based on the calculated safety factor of blade structure stability, the design of floating wind turbine blades is evaluated to see whether it meets the standards.

2. A method for evaluating the structural stability of a floating wind turbine blade according to claim 1, characterized in that: According to the aerodynamic shape data of the blade, a three-dimensional geometric shape diagram of the blade is established, including: According to the design geometric information of the floating wind turbine blade, including blade length, airfoil model of each section of the blade, airfoil geometric data, chord length, twist angle and pre-bending information, a three-dimensional geometric shape diagram of the blade is constructed.

3. A method for evaluating the structural stability of a floating wind turbine blade according to claim 2, characterized in that: According to the blade's three-dimensional geometric shape, the blade's structural design and blade material mechanical performance parameters are input to build a blade finite element model, including: According to the three-dimensional geometric shape of the blade and the design drawings of the wind turbine blade structure, the ply information is set at the corresponding position of the blade, including the quantity, start and end positions and corresponding thickness of the materials, to obtain the structural model of the blade. The ply information includes glass fiber cloth, carbon pultruded board, Balsa, PVC and structural adhesive. According to the structural model of the blade, the mechanical property parameters corresponding to each material are input, including transverse tensile modulus, longitudinal tensile modulus, Poisson's ratio, in-plane shear modulus and out-of-plane shear modulus, and the finite element model of the blade is constructed.

4. A method for evaluating the structural stability of a floating wind turbine blade according to claim 3, characterized in that: According to the constructed blade finite element model, the ultimate load data of the blade of the floating unit under the wind-wave-current coupling is input to obtain the buckling characteristic value of the blade under the corresponding load conditions, including: According to the finite element model of the blade, the ultimate load data of the blade under the coupling of wind, wave and current are applied to the main beam position on the windward and leeward sides of the blade. The structural failure data of the blade is calculated using structural simulation software. The loading method of the ultimate load data is unevenly distributed concentrated force. According to the blade structure failure data calculated by simulation, the characteristic load value of the blade under the actual failure state is extracted.

5. A method for evaluating the structural stability of a floating wind turbine blade according to claim 4, characterized in that: Based on the obtained buckling characteristic values ​​of the blade under the corresponding load conditions and combined with the blade design standards, the safety factor of the blade structure stability is calculated, including: According to the blade design standards GL2010, DNVGL-ST-0376:2015 and IEC 61400-5:2020, the reduction factor for structural stability verification is determined taking into account the influence of operating temperature, environmental aging, manufacturing tolerance and analysis method; According to the obtained reduction factor of the structural stability check, the structural stability safety factor of the blade is calculated, and the formula is as follows: GAMA buckle represents the safety factor of blade structure stability, and F represents the blade buckling characteristic value.

6. A method for evaluating the structural stability of a floating wind turbine blade according to claim 5, characterized in that: Based on the calculated safety factor of blade structure stability, the floating wind turbine blade design is evaluated to see whether it meets the standards, including: If the safety factor f of the blade structure stability is ≥ 1, it means that the safety factor of the blade structure adhesive meets the requirements and the structural strength meets the standards; If the safety factor f of the blade structural stability is less than 1, it means that the safety factor of the blade structural adhesive does not meet the requirements and the structural stability does not meet the standards.

7. A floating wind turbine blade structural stability assessment system, characterized in that: include: The blade three-dimensional module creates a three-dimensional geometric shape diagram of the blade based on the aerodynamic shape data of the blade; The blade modeling module constructs a blade finite element model based on the blade's three-dimensional geometric shape, inputs the blade's structural design drawing and the blade's material mechanical performance parameters; The finite element simulation module uses the constructed blade finite element model to input the ultimate load data of the blades of the floating unit under the coupling of wind, wave and current, and obtains the buckling characteristic value of the blades under the corresponding load conditions; The safety factor calculation module calculates the safety factor of the blade structure stability based on the obtained buckling characteristic value of the blade under the corresponding load conditions and in combination with the blade design standards; The judgment module evaluates whether the floating wind turbine blade design meets the standards based on the calculated safety factor of the blade structure stability.

8. The floating wind turbine blade structural stability evaluation system according to claim 7, characterized in that: In the blade 3D module, a blade 3D geometric shape diagram is established based on the blade aerodynamic shape data, including: According to the design geometric information of the floating wind turbine blade, including blade length, airfoil model of each section of the blade, airfoil geometric data, chord length, twist angle and pre-bending information, a three-dimensional geometric shape diagram of the blade is constructed.

9. The floating wind turbine blade structural stability evaluation system according to claim 8, characterized in that: In the blade modeling module, according to the blade three-dimensional geometric shape, the blade structure design drawing and the blade material mechanical performance parameters are input to build the blade finite element model, including: According to the three-dimensional geometric shape of the blade and the design drawings of the wind turbine blade structure, the ply information is set at the corresponding position of the blade, including the quantity, start and end positions and corresponding thickness of the materials, to obtain the structural model of the blade. The ply information includes glass fiber cloth, carbon pultruded board, Balsa, PVC and structural adhesive. According to the structural model of the blade, the mechanical property parameters corresponding to each material are input, including transverse tensile modulus, longitudinal tensile modulus, Poisson's ratio, in-plane shear modulus and out-of-plane shear modulus, and the finite element model of the blade is constructed.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the computer program implements the steps of a method for evaluating the structural stability of a floating wind turbine blade according to any one of claims 1 to 6.

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