A method and device for establishing a whole dynamics model of a wind turbine

Abstract

This invention discloses a method and apparatus for establishing an overall dynamic model of a wind turbine. The method includes: establishing an aerodynamic model of the wind turbine based on blade element momentum theory; calculating the total aerodynamic force on each first blade unit; obtaining the quasi-steady aerodynamic force and aerodynamic damping matrix of each first blade unit; establishing a finite element model of the overall structure of the horizontal axis wind turbine; defining the aerodynamic damping matrix as the damping property corresponding to the second blade unit in the finite element model; applying each quasi-steady aerodynamic force to the corresponding position on the finite element model; and solving the dynamic response of the overall structure of the horizontal axis wind turbine. This invention can reduce the computational resource consumption and improve computational efficiency when performing wind turbine dynamic analysis.

Description

Technical Field

[0001] This invention relates to the field of wind power engineering technology, specifically to a method and apparatus for establishing an overall dynamic model of a wind turbine. Background Technology

[0002] Existing wind turbine dynamics analysis typically relies on specialized wind turbine simulation software based on multibody dynamics and aerodynamic-structure coupling, such as Bladed and FAST. These software programs require coupling aerodynamic loads, blade and tower motions at each time step, resulting in complex modeling and high computational demands. Furthermore, to ensure computational efficiency, these wind turbine software programs often employ modal superposition or linear beam elements to simulate components such as blades and towers, and simplify model boundary conditions, leading to lower structural analysis accuracy. This makes them unsuitable for applications requiring consideration of strong nonlinearity, refined local stress analysis, and high-precision soil-structure interactions.

[0003] On the other hand, existing general-purpose finite element software such as Ansys and Abaqus possess rich element libraries and sophisticated pre- and post-processing capabilities, enabling refined modeling of wind turbine structures. However, these software programs typically lack built-in wind turbine modeling modules, usually requiring the integration with external CFD or other modeling software for fluid-structure interaction simulations to calculate the dynamic response of the wind turbine. Simulation models built using this method place extremely high demands on computational resources, failing to meet the requirements for efficient computation in engineering design. Summary of the Invention

[0004] The technical problem to be solved by the present invention is to provide a method and apparatus for establishing an overall dynamic model of a wind turbine, which addresses the above-mentioned problems in the existing wind turbine dynamic analysis process by coupling aerodynamic loads, blade and tower motions at each time step, resulting in complex modeling and excessive computational load. This invention can reduce the computational resource consumption and improve computational efficiency when performing wind turbine dynamic analysis.

[0005] To solve the above-mentioned technical problems, the technical solution adopted by the present invention is as follows: A method for establishing an overall dynamic model of a wind turbine includes the following steps: S1. Establish a wind turbine aerodynamic model based on blade element momentum theory. In the wind turbine aerodynamic model, the blade is divided into multiple first blade units, and the total aerodynamic force on each first blade unit is calculated. ; S2, for each first blade unit, the total aerodynamic force it experiences. Decomposed into quasi-steady aerodynamic forces generated by the environmental wind field Aerodynamic damping force is generated by the interaction between airflow and blade motion. and from aerodynamic damping force Separate the aerodynamic damping matrix ; S3, establish a finite element model of the overall structure of the horizontal axis wind turbine by specifying a finite element modeling system. In the finite element model, the blades are divided into multiple second blade units, and the multiple first blade units correspond one-to-one with the multiple second blade units. S4, the aerodynamic damping matrix Defined as the damping property of the corresponding second blade element in the finite element model, and added to the corresponding position of the overall damping matrix of the finite element model; the quasi-steady aerodynamic force of the first blade element is... Apply to the corresponding second blade element in the finite element model; S5, solve for the dynamic response of the overall structure of the horizontal axis fan.

[0006] Optionally, the wind turbine aerodynamic model divides the blade along its span into multiple first blade units.

[0007] Optionally, in step S2, based on the blade aerodynamic decoupling theory, the total aerodynamic force on the first blade unit is... Decomposed into quasi-steady aerodynamic forces generated by the environmental wind field Aerodynamic damping force is generated by the interaction between airflow and blade motion. .

[0008] Optionally, in the wind turbine aerodynamic model, for each blade, the windward direction of the rotor is taken as... Direction, with the span of the blade as... The direction is determined by the direction of rotation of the blade. Direction; Total aerodynamic force on the first blade unit The expression is: , in, This represents the normal velocity of the first blade unit relative to the air. This represents the tangential velocity of the first blade unit relative to the air. This represents the normal force acting on the first blade element. This represents the tangential force acting on the first blade unit; Normal force on the first blade unit The formula for calculation is: , Tangential force on the first blade unit The formula for calculation is: , in, It is a normal quasi-steady aerodynamic force. The wind speed generated at the first blade unit due to the ambient wind speed. Projection in direction, The wind speed generated at the first blade unit due to the rotation of the wind turbine and the ambient wind speed is... Projection in direction, This indicates the movement along the first blade unit due to its own vibration and the movement of the supporting structure. The speed of directional movement, This indicates the movement along the first blade unit due to its own vibration and the movement of the supporting structure. The speed of directional movement, and The relationship is ; and The relationship is , This indicates the tangential quasi-steady aerodynamic force. , , and These represent the four aerodynamic damping coefficients.

[0009] Optionally, in step S2, for each first blade unit, the total aerodynamic force it experiences is... Decomposed into quasi-steady aerodynamic forces generated by the environmental wind field Aerodynamic damping force is generated by the interaction between airflow and blade motion. The expression is: , The quasi-steady aerodynamic force The expression is: , The pneumatic damping force The expression is: , in, ,in, Represents the velocity vector of the blade element; Aerodynamic damping matrix The expression is: .

[0010] Optionally, in step S1, when simulating a wind turbine in operation, the total aerodynamic force on each first blade unit is calculated using blade element momentum theory. When simulating a wind turbine in a stopped state, the total aerodynamic force on each first blade unit is calculated using a specified stopped state blade dynamics analysis method without considering the blade's own motion. .

[0011] Optionally, in step S3, a finite element model of the overall structure of the horizontal axis wind turbine is established, and its rotor is configured to be able to rotate when simulating a wind turbine in operation and to remain fixed when simulating a wind turbine in shutdown.

[0012] Optionally, the finite element model of the overall structure of the horizontal axis wind turbine includes a wind turbine and a support structure, wherein the wind turbine consists of a hub and multiple blades.

[0013] Optionally, the specified finite element modeling system is Ansys; in step S4, the aerodynamic damping matrix is... Defining the damping property as the corresponding second blade element in the finite element model and adding it to the corresponding position in the overall damping matrix of the finite element model specifically includes: for each second blade element in the finite element model, creating a Matrix 27 element and associating it with that second blade element, and adding the aerodynamic damping matrix corresponding to that second blade element. The complete definition is in the properties of the associated Matrix 27 cell.

[0014] In addition, the present invention also provides a device for establishing an overall dynamic model of a wind turbine, including a microprocessor and a memory connected to each other, wherein the microprocessor is programmed or configured to execute the method for establishing the overall dynamic model of the wind turbine.

[0015] Compared with the prior art, the present invention has the following main advantages: This invention first establishes an aerodynamic model of a wind turbine based on blade element momentum theory, and calculates the total aerodynamic force on each first blade unit. Then, the total aerodynamic force on each first blade unit Decomposed into quasi-steady aerodynamic forces independent of motion Aerodynamic damping force is generated by the interaction between airflow and blade motion. From aerodynamic damping force Extracting the aerodynamic damping matrix Subsequently, in the established finite element model of the overall structure of the horizontal axis wind turbine, the corresponding aerodynamic damping matrix of each first blade unit was calculated. The overall damping matrix, integrated into the finite element model, incorporates the quasi-steady aerodynamic forces of the first blade element. The effect is applied to the corresponding second blade element in the finite element model, so that the established finite element model takes into account the coupling effect between air, wind turbine and support structure. In this way, when using finite element software to solve the dynamic response based on the established finite element model, there is no need to perform fluid-structure interaction simulation with external modeling software, which saves computing resources and improves computing efficiency. Attached Figure Description

[0016] Figure 1 This is a schematic diagram of the execution flow of the method of the present invention.

[0017] Figure 2 This is a side view of the overall structure of the wind turbine of the present invention.

[0018] Figure 3 This is a front view schematic diagram of the wind turbine in the overall structure of the wind turbine of the present invention.

[0019] Figure 4 This is a schematic diagram of the structure of the first blade unit or the second blade unit in the overall structure of the wind turbine of the present invention.

[0020] Figure 5 The time history diagram of the displacement at the top of the wind turbine tower is shown in the example. Detailed Implementation

[0021] The technical solution of the present invention will now be described in further detail with reference to the accompanying drawings.

[0022] Figure 1 This invention illustrates an embodiment of a method for establishing an overall dynamic model of a wind turbine. The method for establishing the overall dynamic model of a wind turbine in this embodiment includes the following steps: S1. Establish a wind turbine aerodynamic model based on blade element momentum theory. In the wind turbine aerodynamic model, the blade is divided into multiple first blade units, and the total aerodynamic force on each first blade unit is calculated. ; S2, for each first blade unit, the total aerodynamic force it experiences. Decomposed into quasi-steady aerodynamic forces generated by the environmental wind field Aerodynamic damping force is generated by the interaction between airflow and blade motion. and from aerodynamic damping force Separate the aerodynamic damping matrix ; S3, establish a finite element model of the overall structure of the horizontal axis wind turbine by specifying a finite element modeling system. In the finite element model, the blade is divided into multiple second blade elements, and multiple first blade elements correspond one-to-one with multiple second blade elements. S4, aerodynamic damping matrix Defined as the damping property corresponding to the second blade element in the finite element model, and added to the corresponding position in the overall damping matrix of the finite element model; the quasi-steady aerodynamic force of the first blade element is... Apply it to the corresponding second blade element in the finite element model; S5 is used to calculate the modal parameters and solve the dynamic response of the overall structure of the horizontal axis fan.

[0023] The method for establishing the overall dynamic model of the wind turbine in this embodiment first establishes an aerodynamic model of the wind turbine based on the blade element momentum theory, and then calculates the total aerodynamic force on each first blade unit. Then, the total aerodynamic force on each first blade unit Decomposed into quasi-steady aerodynamic forces independent of motion Aerodynamic damping force is generated by the interaction between airflow and blade motion. From aerodynamic damping force Extracting the aerodynamic damping matrix Subsequently, in the established finite element model of the overall structure of the horizontal axis wind turbine, the corresponding aerodynamic damping matrix of each first blade unit was calculated. The overall damping matrix, integrated into the finite element model, incorporates the quasi-steady aerodynamic forces of the first blade element. The effect is applied to the corresponding second blade element in the finite element model, so that the established finite element model takes into account the coupling effect between air, wind turbine and support structure. In this way, when using finite element software to solve the dynamic response based on the established finite element model, there is no need to perform fluid-structure interaction simulation with external modeling software, which saves computing resources and improves computing efficiency.

[0024] Furthermore, in this embodiment, as Figures 2 to 4 As shown, the aerodynamic model of the wind turbine divides the blade into multiple first blade units along its span. In this embodiment, the span refers to the length direction of the blade from the root to the tip, and the gray area in the figure represents one of the first blade units.

[0025] Furthermore, in this embodiment, in step S2, based on the blade aerodynamic decoupling theory, the total aerodynamic force on the first blade unit is... Decomposed into quasi-steady aerodynamic forces generated by the environmental wind field Aerodynamic damping force is generated by the interaction between airflow and blade motion. In the aerodynamic model of a wind turbine, for each blade, the windward direction of the rotor is taken as... Direction, with the span of the blade as... The direction is determined by the direction of rotation of the blade. Direction, the radial distance from the center of the hub when the wind passes through the plane of the wind turbine. The first blade unit at that location has a tangential velocity in the direction of rotation. , This represents the angular velocity of the wind turbine rotation; the total aerodynamic force acting on the first blade unit. The expression is: (1) in, This represents the normal velocity of the first blade unit relative to the air. This represents the tangential velocity of the first blade unit relative to the air. This represents the normal force acting on the first blade element. This represents the tangential force acting on the first blade unit; Normal force on the first blade unit The formula for calculation is: (2) Tangential force on the first blade unit The formula for calculation is: (3) in, It is the normal quasi-steady aerodynamic force (corresponding to) Figure 4 In ), The wind speed generated at the first blade unit due to the ambient wind speed. Projection in direction, The wind speed generated at the first blade unit due to the rotation of the wind turbine and the ambient wind speed is... Projection in direction, This indicates the movement along the first blade unit due to its own vibration and the movement of the supporting structure. The speed of directional movement, This indicates the movement along the first blade unit due to its own vibration and the movement of the supporting structure. The speed of directional movement, and The relationship is ; and The relationship is , Indicates tangential quasi-steady aerodynamic force (corresponding to) Figure 4 In ).

[0026] For wind turbines that are in operation: (4) (5) in, This indicates the relative wind speed felt by the blades. Indicates air density, Indicates the axial force coefficient. Indicates the tangential force coefficient. Indicates the chord length of the blade. Indicates the blade unit length (see...) Figure 4 ).

[0027] , , and The four aerodynamic damping coefficients represent the flapwise and edgewise directions of the first blade unit, respectively: (6) (7) (8) (9) The formula for calculation is: (10) The formula for calculation is: (11) in, , , , , This represents the sum of the blade unit's angle of attack, pitch angle, and initial twist angle (see [reference]). Figure 4 ), Indicates the axial induction factor. Indicates the tangential induction factor; and It can be determined by the following two formulas: (12) (13) in, Indicates the degree of reality; and It can be determined by the following two formulas: (14) (15) in, , ; , , and It can be expressed using the following four formulas: (16) (17) (18) (19) and This can be expressed using the following two formulas: (20) (twenty one) in and These are the lift coefficient and drag coefficient of the first blade unit, respectively.

[0028] For wind turbines that are in a shutdown state: (twenty two) (twenty three) , , and The expression is consistent with equations (6) to (9). Among them, The formula for calculation is: (twenty four) The formula for calculation is: (25) , , and The expressions are referenced in equations (16) to (21). It should be noted that... and It can be determined by the following two formulas: (26) (27) Furthermore, in step S2, for each first blade unit, the total aerodynamic force it experiences is... Decomposed into quasi-steady aerodynamic forces generated by the environmental wind field Aerodynamic damping force is generated by the interaction between airflow and blade motion. The expression is: (28) Quasi-steady aerodynamics The expression is: (29) pneumatic damping force The expression is: (30) in, ,in, Represents the velocity vector of the blade element; Aerodynamic damping matrix The expression is: (31) Furthermore, in this embodiment, in step S1, when simulating a wind turbine in operation, the total aerodynamic force on each first blade unit is calculated using blade element momentum theory. When simulating a wind turbine in a stopped state, the total aerodynamic force on each first blade unit is calculated using a specified stopped state blade dynamics analysis method without considering the blade's own motion. For example, given information such as wind speed and wind angle of attack, the total aerodynamic force can be calculated directly using the blade aerodynamic coefficient; in step S3, a finite element model of the overall structure of the horizontal axis wind turbine is established, and its rotor is configured to be able to rotate when simulating a wind turbine in operation and to remain fixed when simulating a wind turbine in shutdown.

[0029] Furthermore, in this embodiment, the finite element model of the overall structure of the horizontal axis wind turbine includes a wind turbine and a support structure. The wind turbine consists of a hub and multiple blades. Specifically, in this embodiment, there are three blades, and the support structure is a tower. Of course, in other embodiments, the number of blades can be other numbers, and the support structure can also be a fixed wind turbine foundation, a floating wind turbine foundation, etc.

[0030] Furthermore, in this embodiment, Ansys is specified as the finite element modeling system. Depending on the actual simulation needs, some or all of the beam elements, shell elements, or solid elements can be used to build the finite element model of the overall structure of the horizontal axis wind turbine. Of course, in other embodiments, the finite element modeling system can also be Abaqus or other custom finite element analysis programs.

[0031] Furthermore, in this embodiment, in step S3, the aerodynamic damping matrix is... Defined as the damping property of the corresponding second blade element in the finite element model, and added to the corresponding position in the overall damping matrix of the finite element model, this includes: for each second blade element in the finite element model, creating a Matrix 27 element and associating it with that second blade element, and adding the aerodynamic damping matrix corresponding to that second blade element. The complete definition is then attached to the attributes of the associated Matrix 27 element. After the attributes of the Matrix 27 element are defined, it is required to ensure that the velocity vector of the second blade element is correctly aligned with the values ​​in the Matrix 27 element. Multiplication. Through the above operations, the aerodynamic damping matrix in the Matrix 27 element is... During the assembly of the finite element system's damping matrix, the aerodynamic damping effect will be automatically added to the corresponding position of the overall damping matrix of the entire finite element model in a built-in manner, thus becoming part of the system's inherent properties. This means that in the subsequent dynamic response solution, the aerodynamic damping effect will be automatically considered by the finite element solver without any external coupling calculations.

[0032] Furthermore, in this embodiment, the quasi-steady aerodynamic force of the first blade unit is... An external load is applied to the corresponding second blade element in the finite element model.

[0033] As an optional implementation, step S5 further includes modal analysis of the overall structure of the horizontal axis fan based on the finite element model, due to the aerodynamic damping matrix It is added in a built-in manner to the system damping matrix of the finite element model of the overall structure of the horizontal axis wind turbine. Common eigenvalue analysis can be performed on the aforementioned overall structure of the horizontal axis wind turbine to obtain the wind turbine modal parameters considering aerodynamic effects. The modal parameters include the frequency, damping ratio, and mode shape corresponding to each mode. Furthermore, using the numerical integration method of the finite element method, the damping matrix can be further analyzed by adding quasi-steady aerodynamic forces. and aerodynamic damping matrix The dynamic response of the overall structure of a horizontal axis wind turbine is solved using a finite element model. After solving, the dynamic responses such as acceleration, velocity, and displacement at various nodes of the blades and support structure can be obtained. In a specific example, the calculated displacement at the top of the wind turbine tower is shown below. Figure 5 As shown.

[0034] In addition, this embodiment also provides a wind turbine overall dynamic model establishment device, including a microprocessor and a memory connected to each other, wherein the microprocessor is programmed or configured to execute the wind turbine overall dynamic model establishment method.

[0035] Those skilled in the art will understand that the technical solutions provided by the embodiments of this application may be in the form of a method, system, or computer program product. Therefore, this application may take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, this application may take the form of a computer program product embodied on one or more computer-readable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code. This application is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It should be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create an implementation for the process. Figure 1 One or more processes and / or boxes Figure 1 The computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to operate in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The functions specified in one or more boxes. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable apparatus for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0036] The above description is merely a preferred embodiment of the present invention. The scope of protection of the present invention is not limited to the above embodiments. All technical solutions falling within the scope of the present invention's concept are within the scope of protection of the present invention. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principles of the present invention should also be considered within the scope of protection of the present invention.

Claims

1. A method for establishing an overall dynamic model of a wind turbine, characterized in that, Includes the following steps: S1. Establish a wind turbine aerodynamic model based on blade element momentum theory. In the wind turbine aerodynamic model, the blade is divided into multiple first blade units, and the total aerodynamic force on each first blade unit is calculated. ; S2, for each first blade unit, the total aerodynamic force it experiences. Decomposed into quasi-steady aerodynamic forces generated by the environmental wind field Aerodynamic damping force is generated by the interaction between airflow and blade motion. and from aerodynamic damping force Separate the aerodynamic damping matrix ; S3, A finite element model of the overall structure of the horizontal axis wind turbine is established by specifying a finite element modeling system. In the finite element model, the blades are divided into multiple second blade units, and the multiple first blade units correspond one-to-one with the multiple second blade units. S4, the aerodynamic damping matrix Defined as the damping property of the corresponding second blade element in the finite element model, and added to the corresponding position of the overall damping matrix of the finite element model; the quasi-steady aerodynamic force of the first blade element is... Apply to the corresponding second blade element in the finite element model; S5. Solve the dynamic response of the overall structure of the horizontal axis fan based on the finite element model.

2. The method for establishing the overall dynamic model of a wind turbine according to claim 1, characterized in that, The wind turbine aerodynamic model divides the blade along its span into multiple first blade units.

3. The method for establishing the overall dynamic model of a wind turbine according to claim 1, characterized in that, In step S2, based on the aerodynamic decoupling theory of blades, the total aerodynamic force on the first blade unit is... Decomposed into quasi-steady aerodynamic forces generated by the environmental wind field Aerodynamic damping force is generated by the interaction between airflow and blade motion. .

4. The method for establishing the overall dynamic model of a wind turbine according to claim 3, characterized in that, In the aforementioned wind turbine aerodynamic model, for each blade, the windward direction of the rotor is taken as... Direction, with the span of the blade as... The direction is determined by the direction of rotation of the blade. Direction; Total aerodynamic force on the first blade unit The expression is: ， in, This represents the normal velocity of the first blade unit relative to the air. This represents the tangential velocity of the first blade unit relative to the air. This represents the normal force acting on the first blade element. This represents the tangential force acting on the first blade unit; Normal force on the first blade unit The formula for calculation is: Tangential force on the first blade unit The formula for calculation is: in, It is a normal quasi-steady aerodynamic force. The wind speed generated at the first blade unit due to the ambient wind speed. Projection in direction, The wind speed generated at the first blade unit due to the rotation of the wind turbine and the ambient wind speed is... Projection in direction, This indicates the movement along the first blade unit due to its own vibration and the movement of the supporting structure. The speed of directional motion, This indicates the movement along the first blade unit due to its own vibration and the movement of the supporting structure. The speed of directional motion, and The relationship is ; and The relationship is , This indicates the tangential quasi-steady aerodynamic force. , , and These represent the four aerodynamic damping coefficients.

5. The method for establishing the overall dynamic model of a wind turbine according to claim 4, characterized in that, In step S2, for each first blade unit, the total aerodynamic force it experiences is calculated. Decomposed into quasi-steady aerodynamic forces generated by the environmental wind field Aerodynamic damping force is generated by the interaction between airflow and blade motion. The expression is: ， The quasi-steady aerodynamic force The expression is: ， The pneumatic damping force The expression is: in, ,in, This represents the velocity vector of the first blade element; Aerodynamic damping matrix The expression is: 。 6. The method for establishing the overall dynamic model of a wind turbine according to claim 1, characterized in that, In step S1, when simulating a wind turbine in operation, the total aerodynamic force on each first blade unit is calculated using blade element momentum theory. When simulating a wind turbine in a stopped state, the total aerodynamic force on each first blade unit is calculated using a specified stopped state blade dynamics analysis method without considering the blade's own motion. .

7. The method for establishing the overall dynamic model of a wind turbine according to claim 1, characterized in that, In step S3, a finite element model of the overall structure of the horizontal axis wind turbine is established, and its rotor is configured to rotate when simulating a wind turbine in operation and remain fixed when simulating a wind turbine in shutdown.

8. The method for establishing a wind turbine overall dynamic model according to any one of claims 1 to 7, characterized in that, The finite element model of the overall structure of the horizontal axis wind turbine includes a wind turbine and a support structure. The wind turbine consists of a hub and multiple blades.

9. The method for establishing a wind turbine overall dynamic model according to any one of claims 1 to 7, characterized in that, The specified finite element modeling system is Ansys, and in step S4, the aerodynamic damping matrix is... Defining the damping property as the corresponding second blade element in the finite element model and adding it to the corresponding position in the overall damping matrix of the finite element model specifically includes: for each second blade element in the finite element model, creating a Matrix 27 element and associating it with that second blade element, and adding the aerodynamic damping matrix corresponding to that second blade element. The complete definition is in the properties of the associated Matrix 27 cell.

10. A device for establishing an overall dynamic model of a wind turbine, comprising a microprocessor and a memory interconnected, characterized in that, The microprocessor is programmed or configured to execute the method for establishing the overall dynamic model of a wind turbine as described in any one of claims 1 to 9.

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