A strut system and optimization method for suppressing the deformation of flexible wind turbine blades

Abstract

The present invention belongs to the technical field of wind power equipment, and particularly relates to a strut system for suppressing the deformation of flexible wind turbine blades and an optimization method. The strut system includes a rotating chamber and a plurality of struts; the rotating chamber and the wind turbine tower are respectively located on both sides of the wind turbine blade, and the rotating chamber is drivingly connected to the wind turbine hub; one end of the strut is connected to the wind turbine blade, and the other end is connected to the rotating chamber. The present invention can significantly improve the load-bearing capacity of the wind turbine blade while suppressing the deformation of the wind turbine blade, and at the same time has the advantages of simple structure, low cost, good aerodynamic efficiency, and convenient construction.

Description

Technical Field

[0001] The present invention belongs to the technical field of wind power equipment, and in particular relates to a support rod system and an optimization method for suppressing deformation of wind power flexible blades. Background Art

[0002] With the development of high-power wind turbines, the use of ultra-long flexible blades has become more and more widespread, and the wind-induced damage and stability problems of blades have become more prominent. Among them, blade bending and torsion fracture and flutter instability are the most common forms of blade damage. The fundamental reason for blade damage is that the ultra-long flexible blade is essentially an ultra-long cantilever beam fixed to the hub, which has a great tendency to structural damage.

[0003] The deformation of wind turbine blades can be optimized through material and structural optimization methods, such as changing material properties, increasing blade thickness and width, and changing the blade material structure to reduce its deformation. However, the above optimization methods have many disadvantages: it is difficult to strike a balance between the mechanical properties of the blades and the material cost, and increasing the amount of blade material makes it difficult to achieve lightweight wind rotors, and there is a risk of damaging the entire machine, etc., and they still do not have a market prospect for widespread promotion.

[0004] How to achieve low cost, blade load reduction and other functions by adding simple auxiliary structures has important engineering application value. Summary of the invention

[0005] In order to address the deficiencies of the prior art, the present invention provides a support rod system and an optimization method for suppressing the deformation of wind turbine flexible blades, which can significantly improve the load-bearing capacity of wind turbine blades while suppressing the deformation of wind turbine blades. It has the advantages of simple structure, low cost, good aerodynamic efficiency, and convenient construction.

[0006] In order to solve the deficiencies of the prior art, the technical solution provided by the present invention is:

[0007] A support rod system for suppressing deformation of a wind power flexible blade comprises a rotating bin and a plurality of support rods;

[0008] The rotating bin and the fan tower are respectively located on both sides of the fan blades, and the rotating bin is drivingly connected to the fan hub;

[0009] One end of the support rod is connected to the fan blade, and the other end is connected to the rotating bin.

[0010] Preferably, the rotating bin is cylindrical, the rotating bin is coaxial with the fan hub, and a hole is opened on the side of the rotating bin;

[0011] The support rod is inserted into the opening on the side of the rotating bin and is fixedly connected with the rotating bin.

[0012] Preferably, the number of the support rods is consistent with the number of fan blades, and the support rods correspond to the fan blades one by one.

[0013] Preferably, the lengths of the plurality of support rods are equal, and the angles between the support rods are equal; the end where the fan blade is connected to the fan hub is denoted as the starting point, the tip of the fan blade is denoted as the end point, and the connection positions of the support rods and the fan blade are the same.

[0014] Preferably, the support rod includes a buffer rod, a buffer cylinder and a shock-absorbing spring; the shock-absorbing spring is arranged in the buffer cylinder and is connected to the buffer rod and the buffer cylinder at both ends respectively; the buffer rod is inserted into the buffer cylinder and is slidably connected to the buffer cylinder and is connected to the rotating bin; the buffer cylinder is connected to the fan blade.

[0015] Preferably, a fixed-end slide rail is arranged on the fan blade; a side column is slidably connected to the fixed-end slide rail; the side column is hinged to the support rod through a ball joint.

[0016] Preferably, the optimization method for the connection position of the support rod and the fan blade includes

[0017] simplifying the fan blade into a cantilever beam;

[0018] constructing a finite element model with the starting point of the cantilever beam fixed, the end of the support rod close to the starting point of the cantilever beam fixed, and the other end hinged to the cantilever beam;

[0019] applying a preset wind pressure to the cantilever beam;

[0020] analyzing the deflection, shear force, bending moment and rotation angle of the cantilever beam when the connection positions of the support rod and the cantilever beam are different through finite element analysis;

[0021] optimizing the connection position of the support rod and the cantilever beam according to the deflection, shear force, bending moment and rotation angle of the cantilever beam to obtain the connection position of the support rod and the fan blade.

[0022] Preferably, the connection position of the support rod and the fan blade is located at 3 / 8 to 5 / 8 of the fan blade.

[0023] An optimization method for a support rod system for suppressing the deformation of a flexible wind turbine blade includes

[0024] denoting the end where the fan blade is connected to the fan hub as the starting point, the tip of the fan blade as the end point, and simplifying the fan blade into a cantilever beam;

[0025] constructing a finite element model with the starting point of the cantilever beam fixed, the end of the support rod close to the starting point of the cantilever beam fixed, and the other end hinged to the cantilever beam;

[0026] applying a preset wind pressure to the cantilever beam;

[0027] analyzing the deformation parameters of the cantilever beam when the connection positions of the support rod and the cantilever beam are different through finite element analysis;

[0028] Optimize the connection position of the strut and the cantilever beam according to the deformation parameters of the cantilever beam to obtain the connection position of the strut and the wind turbine blade.

[0029] Preferably, it further includes

[0030] After applying a preset wind pressure to the cantilever beam, analyze the tensile stress of the strut when the connection position of the strut and the cantilever beam is different through finite element analysis;

[0031] Optimize the connection position of the strut and the cantilever beam according to the deformation parameters of the cantilever beam and the tensile stress of the strut to obtain the connection position of the strut and the wind turbine blade;

[0032] The deformation parameters of the cantilever beam include the deflection, shear force, bending moment and rotation angle of the cantilever beam.

[0033] Advantages of the present invention:

[0034] The present invention adds struts to transform the ultra-long flexible blades of the wind turbine into a redundant-degree-of-freedom statically indeterminate beam, which can control the blade flapping, reduce the blade flexibility, effectively reduce the stress and deformation of the ultra-long flexible blades, improve the overall stability and safety, enhance the load-bearing capacity of the wind turbine blades, and at the same time has the advantages of simple structure, low cost, good aerodynamic efficiency, and convenient construction.

[0035] The present invention places a rotating bin at the front end of the hub and connects it to the strut, which can effectively avoid the entanglement between the strut and the wind turbine tower.

[0036] The present invention adopts a slide rail design at the connection between the blade and the strut. During the operation of the wind turbine, the blade can yaw to a certain extent, which can enhance the stability of the strut during the operation of the wind turbine and extend the service life of the strut. Description of the drawings

[0037] Figure 1 Schematic diagram of the strut system for suppressing the deformation of the flexible wind turbine blade provided in Embodiment 1 when applied to a horizontal-axis wind turbine;

[0038] Figure 2 Side view of the connection of the wind turbine hub, rotating bin and strut provided in Embodiment 1;

[0039] Figure 3 Front view of the connection of the wind turbine hub, rotating bin and strut provided in Embodiment 1;

[0040] Figure 4 Schematic diagram of the connection between the blade and the strut provided in Embodiment 1;

[0041] Figure 5 Schematic diagram of the internal structure of the strut provided in Embodiment 1;

[0042] Figure 6(a) is a schematic diagram of the connection position of the strut and the wind turbine blade near the wing tip when applied to a horizontal-axis wind turbine;

[0043] Figure 6(b) is a schematic diagram of the connection position of the strut and the wind turbine blade in the middle when applied to a horizontal-axis wind turbine;

[0044] Figure 6(c) is a schematic diagram of the connection position of the strut and the wind turbine blade near the wind turbine hub when applied to a horizontal-axis wind turbine;

[0045] Figure 7 It is a flowchart of the optimization method of the strut system for suppressing the deformation of the flexible wind turbine blade provided in the second embodiment;

[0046] Figure 8(a) is a deformation diagram of the wind turbine blade without a strut in the third embodiment;

[0047] Figure 8(b) to 8(h) They are respectively the deformation diagrams of the wind turbine blade when the strut is connected to the 1 / 8 position (Figure 8(b)), 1 / 4 position (Figure 8(c)), 3 / 8 position (Figure 8(d)), 1 / 2 position (Figure 8(e)), 5 / 8 position (Figure 8(f)), 3 / 4 position (Figure 8(g)), 7 / 8 position (Figure 8(h)) of the wind turbine blade in the third embodiment;

[0048] Figure 9 It is the fitting function of the shear force of the cantilever beam during the finite element analysis in the third embodiment;

[0049] Figure 10 It is the fitting function of the displacement of the cantilever beam during the finite element analysis in the third embodiment;

[0050] Figure 11 It is the reduction amount and the fitting function of the reduction amount after weighting the shear force and displacement of the rod during the finite element analysis in the third embodiment;

[0051] Among them, 1 is the wind turbine blade; 2 is the wind turbine hub; 3 is the strut; 31 is the buffer rod; 32 is the buffer cylinder; 4 is the wind turbine tower; 5 is the rotating bin; 6 is the bolt; 7 is the transmission nacelle; 8 is the fixed-end slide rail; 9 is the side column; 10 is the shock-absorbing spring; 100 is the cantilever beam. Specific implementation mode

[0052] The present invention will be further described below in conjunction with the implementation mode. The following implementation modes are only used to more clearly illustrate the technical solution of the present invention and cannot be used to limit the protection scope of the present invention.

[0053] Embodiment 1

[0054] This embodiment provides a strut system for suppressing the deformation of the flexible wind turbine blade. Refer to Figure 1 、 Figure 2 and Figure 3, including a rotating bin 5 and a plurality of support rods 3; the rotating bin 5 and the wind turbine tower 4 are respectively located on both sides of the wind turbine blade 1, and the rotating bin 5 is in transmission connection with the wind turbine hub 2 through a transmission cabin 7 arranged inside the wind turbine hub 2; one end of the support rod 3 is connected to the wind turbine blade 1, and the other end is connected to the rotating bin 5, and the support rod 3 rotates synchronously with the wind turbine blade 1, the rotating bin 5, and the wind turbine hub 2.

[0055] See Figure 2 , the rotating bin 5 is arranged at the tip position of the wind turbine hub 2. The material of the rotating bin 5 is the same as that of the wind turbine.

[0056] Adding the support rod 3 transforms the ultra-long flexible blade of the wind turbine into a super-static stator system with redundant degrees of freedom, thereby effectively reducing the stress and deformation of the ultra-long flexible blade, significantly improving the bearing capacity of the wind turbine blade while suppressing the deformation of the wind turbine blade, and having the advantages of simple structure, low cost, good aerodynamic efficiency, and convenient construction.

[0057] In an alternative embodiment of the present invention, see Figure 1 , Figure 2 and Figure 3 , the rotating bin 5 is cylindrical, and the rotating bin 5 and the wind turbine hub 2 are coaxial; the side of the rotating bin 5 is provided with an opening, and the support rod 3 is inserted into the opening on the side of the rotating bin 5 and fixedly connected to the rotating bin 5 through a bolt 6.

[0058] In an alternative embodiment of the present invention, see Figure 1 , Figure 6(a), Figure 6(b) and Figure 6(c), the number of support rods 3 is the same as that of the wind turbine blades 1, and the support rods 3 correspond to the wind turbine blades 1 one by one. Preferably, the lengths of the plurality of support rods 3 are equal, and the angles between the support rods 3 are equal. The plurality of connection points of the plurality of support rods 3 on the rotating bin 5 are equally spaced, and the plurality of connection points are coplanar and the plane formed is perpendicular to the axis of the rotating bin 5; along the span direction, the end of the wind turbine blade 1 connected to the wind turbine hub 2 is denoted as the starting point, and the tip of the wind turbine blade 1 is denoted as the end point, and the connection position of each support rod 3 with the wind turbine blade 1 is the same.

[0059] In an alternative embodiment of the present invention, see Figure 5 , the support rod 3 includes a buffer rod 31, a buffer cylinder 32 and a shock-absorbing spring 10. The shock-absorbing spring 10 is arranged inside the buffer cylinder 32 and is connected to the buffer rod 31 and the buffer cylinder 32 at both ends respectively. The buffer rod 31 is inserted into the buffer cylinder and is slidably connected to the buffer cylinder 32, and is connected to the rotating bin 5 through a bolt 6. The buffer cylinder 32 is connected to the wind turbine blade 1.

[0060] In an alternative embodiment of the present invention, see Figure 4 , a fixed-end slide rail 8 is provided on the wind turbine blade 1, a side column 9 is slidably connected to the fixed-end slide rail 8, and the side column 9 is hinged to the buffer cylinder 32 of the support rod 3 through a ball joint.

[0061] During use, when wind load is applied to the wind turbine blade 1, the wind turbine blade 1 is bent by the external force and squeezes the buffer cylinder 32. The buffer cylinder 32 presses against the shock-absorbing spring 10, and the shock-absorbing spring 10 is compressed and contracted. At the same time, a supporting force is given to the wind turbine blade 1 through the buffer rod 31, converting the impact force received by the wind turbine blade 1 into elastic potential energy and releasing it, playing a buffering role for the impact, thereby reducing the bending degree of the wind turbine blade 1 and hindering the bending of the wind turbine blade 1.

[0062] No prestress is applied to the support rod 3. The support rod 3 and the wind turbine blade 1 are connected through the side column 9 and a ball joint. When the wind turbine blade 1 yaws, the side column 9 can move on the fixed-end slide rail 8, and the side column 9 and the support rod 3 are connected through a ball joint, which can achieve flexible support and enhance the effects of resisting vibration and impact loads.

[0063] Figure 1 It is a schematic diagram of the application of the support rod system for suppressing the deformation of flexible wind turbine blades to a horizontal-axis wind turbine. The wind turbine blade 1, the wind turbine hub 2, and the wind turbine tower 4 are existing components. At this time, there are 3 support rods, and a connection point is provided at every 120° on the side of the rotating bin 5 for connecting with the support rod 3.

[0064] Specifically, the connection position between the support rod and the wind turbine blade is determined by performing a linear elastic eigenvalue buckling analysis on the established finite element model. The optimization method is as follows: Denote the end of the wind turbine blade connected to the wind turbine hub as the starting point, and the tip of the wind turbine blade as the end point. Simplify the wind turbine blade into a cantilever beam, construct a finite element model with the starting point of the cantilever beam fixed, the end of the support rod close to the starting point of the cantilever beam fixed, and the other end hinged to the cantilever beam. Apply a preset wind pressure to the cantilever beam, and through finite element analysis, obtain the deflection, shear force, bending moment, and rotation angle of the cantilever beam when the connection position between the support rod and the cantilever beam is different; determine the connection position between the support rod and the cantilever beam based on the deflection, shear force, bending moment, and rotation angle of the cantilever beam, and further obtain the connection position between the support rod and the wind turbine blade.

[0065] Specifically, according to the characteristics of the deformation, when the external load increases by a small amount, the displacement will change greatly. Therefore, the approximate differential equation for the deflection curve of the cantilever beam is:

[0066]

[0067] where x is the length in the span direction, m; denote x at the starting point of the cantilever beam as 0; y(x) is the deflection size at the cross-section where the length in the span direction is x, m; C is the coefficient of the first-order term; D is the coefficient of the constant term; M(x) is the bending moment size at the cross-section where the length in the span direction is x, N*m; EI is the flexural rigidity of the cantilever beam, N / M 2 . The coefficient of the first-order term and the coefficient of the constant term are determined by the working conditions of the cantilever beam.

[0068] The shear force N(x) at the cross-section when the length in the span direction is x is:

[0069] N(x) = ∑F(x)

[0070] where the unit of the shear force N(x) is N; F(x) is the external force in the vertical direction at the cross-section when the length in the span direction is x, in N.

[0071] The calculation formula for the bending moment M(x) is:

[0072] M(x) = ∑F(x)x

[0073] The rotation angle θ(x) at the cross-section when the length in the span direction is x is:

[0074]

[0075] When the cantilever beam undergoes bending deformation, the strut fixed to the cantilever beam will be subjected to a certain tensile or compressive force. Preferably, when a finite element model of the wind turbine structure is constructed and a preset wind pressure is applied, the tensile stress of the strut can be further compared when the connection position between the strut and the wind turbine blade is different to comprehensively optimize the connection position between the strut and the wind turbine blade.

[0076] The tensile or compressive force should be calculated accordingly by Euler's formula, and its corresponding formula is expressed as:

[0077]

[0078] where F cr is the tensile or compressive force on the strut, in N; μ is the length coefficient. In the establishment of the finite element model of this structure, the connection between the strut and the cantilever beam is simplified to a hinge, so the value is usually 1. l is the length of the strut, in m.

[0079] Preferably, the strut 3 is connected to the 1 / 2 position of the wind turbine blade 1.

[0080] Embodiment 2

[0081] This embodiment provides an optimization method for a strut system for suppressing the deformation of a flexible wind turbine blade. The strut system for suppressing the deformation of a flexible wind turbine blade described in Embodiment 1 is adopted. See Figure 7 , including,

[0082] Denote the end of the wind turbine blade connected to the wind turbine hub as the starting point, and the tip of the wind turbine blade as the ending point. Simplify the wind turbine blade into a cantilever beam, construct a finite element model with the starting point of the cantilever beam fixed, the end of the strut close to the starting point of the cantilever beam fixed, and the other end hinged to the cantilever beam. Apply a preset wind pressure to the cantilever beam, and through finite element analysis, obtain the deflection, shear force, bending moment, and rotation angle of the cantilever beam when the connection position between the strut and the cantilever beam is different; optimize the connection position between the strut and the cantilever beam according to the deflection, shear force, bending moment, and rotation angle of the cantilever beam, and then obtain the connection position between the strut and the wind turbine blade.

[0083] Specifically, according to the characteristics of deformation, when the external load increases by a small amount, the displacement will change greatly. Therefore, the approximate differential equation for the deflection curve of the cantilever beam is:

[0084]

[0085] where x is the length in the span direction, m; denote x at the starting point of the cantilever beam as 0; y(x) is the deflection magnitude at the cross-section when the length in the span direction is x, m; C is the coefficient of the first-order term; D is the coefficient of the constant term; M(x) is the bending moment magnitude at the cross-section when the length in the span direction is x, N*m; EI is the flexural rigidity of the cantilever beam, N / M 2 . The coefficient of the first-order term and the coefficient of the constant term are determined by the working conditions of the cantilever beam.

[0086] For the shear force N(x) at the cross-section when the length in the span direction is x:

[0087] N(x) = ∑F(x)

[0088] where the unit of the shear force N(x) is N; F(x) is the external force in the vertical direction at the cross-section when the length in the span direction is x, N.

[0089] The calculation formula for the bending moment M(x) is:

[0090] M(x) = ∑F(x)x

[0091] The rotation angle θ(x) at the cross-section when the length in the span direction is x is:

[0092]

[0093] When the cantilever beam undergoes bending deformation, the strut fixed on the cantilever beam will be subjected to a certain tensile and compressive force. Preferably, when constructing a finite element model of the wind turbine structure and applying a preset wind pressure, the connection position between the strut and the wind turbine blade can be comprehensively optimized by further comparing the tensile stress of the strut when the connection position between the strut and the wind turbine blade is different.

[0094] The tensile and compressive force should be calculated accordingly by Euler's formula, and its corresponding formula is expressed as:

[0095]

[0096] Among them, F cr is the tensile and compressive force on the strut, in N; μ is the length coefficient. In the establishment of the finite element model of this structure, the connection between the strut and the cantilever beam is simplified to a hinge, so the value is usually 1. l is the length of the strut, in m.

[0097] Embodiment Three

[0098] The fan blade 1 is simplified to a cantilever beam 100. The starting point of the fan blade 1 is the starting point of the cantilever beam 100, and the ending point of the fan blade 1 is the ending point of the cantilever beam 100. The specific parameter settings are as follows:

[0099] Condition 1: Assume that the total length of the simplified cantilever beam 100 of the fan blade 1 is 1 m. When the starting point of the cantilever beam 100 is fixed and there is no support for the cantilever beam 100, assume that the tensile stiffness of the cantilever beam 100 is infinite, and the bending stiffness is 1000000 N / M 2 , the self-weight is 1800 kg / m, and it bears a linear load that decreases from 2500 N at the starting point of the cantilever beam to 1500 N at the ending point of the cantilever beam. The schematic diagram is shown in Figure 8(a).

[0100] Condition 2: The setting of the cantilever beam 100 and the external load conditions are the same as those in Condition 1. A hinge point is set at a distance of 1 / 8 of the length from the starting point of the cantilever beam 100 to be hinged with the strut 3, and the other end of the strut 3 is fixed 0.125 m below the starting point of the cantilever beam. The tensile stiffness of the strut 3 is infinite, and the bending stiffness is 800000 N / M 2 , and the self-weight is 1000 kg / m. The schematic diagram is shown in Figure 8(b).

[0101] Condition 3: Except that the connection position between the strut 3 and the cantilever beam 100 is changed to 1 / 4 of the starting point of the cantilever beam 100, the other settings are the same as those in Condition 2. The schematic diagram is shown in Figure 8(c).

[0102] Condition 4: Except that the connection position between the strut 3 and the cantilever beam 100 is changed to 3 / 8 of the starting point of the cantilever beam 100, the other settings are the same as those in Condition 2. The schematic diagram is shown in Figure 8(d).

[0103] Condition 5: Except that the connection position between the strut 3 and the cantilever beam 100 is changed to 1 / 2 of the starting point of the cantilever beam 100, the other settings are the same as those in Condition 2. The schematic diagram is shown in Figure 8(e).

[0104] Condition 6: Except that the connection position between the strut 3 and the cantilever beam 100 is changed to 5 / 8 of the starting point of the cantilever beam 100, the other settings are the same as those in Condition 2. The schematic diagram is shown in Figure 8(f).

[0105] Condition 7: Except that the connection position of the support rod 3 and the cantilever beam 100 is changed to 3 / 4 of the starting point of the cantilever beam 100, the other settings are the same as those in Condition 2. The schematic diagram is shown in Fig. 8(g).

[0106] Condition 8: Except that the connection position of the support rod 3 and the cantilever beam 100 is changed to 7 / 8 of the starting point of the cantilever beam 100, the other settings are the same as those in Condition 2. The schematic diagram is shown in Fig. 8(h).

[0107] After applying the wind pressure, the deformations of the cantilever beam 100 and the support rod 3 under each condition are as Figure 8(a) to Figure 8(h) shown.

[0108] The method described in Example 2 is used for simulation to obtain Table 1.

[0109] Table 1 Comparison list of parameters at the end of the cantilever beam under different conditions

[0110] Operating condition Deflection / m Rotation angle / Deg Shearing force / N Bending moment / N*m 1 0.0000065 0.0000998 1695.31250 685.87240 2 0.0000017 0.0000136 796.50879 439.20607 3 0.0000005 0.0000044 681.06082 63.79424 4 0.0000004 0.0000047 555.32130 9.21220 5 0.0000001 0.0000014 118.33697 17.75155 6 0.0000003 0.0000032 357.33263 18.93710 7 0.0000006 0.0000083 600.54665 22.20377 8 0.0000010 0.0000134 783.24374 52.18778

[0111] According to the shear force magnitude in Table 1, the fitting formula for the hinge position x of the support rod and the shear force y can be obtained: y = 74067.96709 + (-1.4633×10 7 / PI)×(63.11979 / (4×(x - 5.21773)^2 + 63.11979^2)), as Figure 9 shown.

[0112] According to the deflection in Table 1, the fitting formula for the hinge position x of the support rod and the deflection (vertical displacement) y can be obtained: y = 9.50499×10 - 4 + (-0.33734 / PI)×(112.91911 / (4×(x - 5.40042)^2 + 112.91911^2)), and the fitting function is as Figure 10 shown.

[0113] The shear forces and deflections of the rods under the above different conditions are weighted 1:1 and compared with the condition without the support rod to obtain the reduction amounts of the shear force and displacement under each condition, and the reduction amounts are fitted, as Figure 11 shown. It can be seen that it is better to arrange the support rod 3 in the middle of the fan blade 1, and it is optimal to arrange the support rod 3 at 9 / 16 of the fan blade 1.

[0114] Those skilled in the art should understand that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can adopt the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0115] This application is described with reference to the flowcharts and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the present application. It should be understood that each flow and / or block in the flowchart and / or block diagram, and the combination of flows 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 the processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing device to generate a machine, such that the instructions executed by the processor of the computer or other programmable data processing device generate means for implementing the functions specified in one or more of the flows Figure 1 one or more of the flows and / or blocks Figure 1 or means for implementing the functions specified in one or more of the blocks.

[0116] These computer program instructions can also be stored in a computer-readable memory that can direct a computer or other programmable data processing device to work in a specific manner, such that the instructions stored in the computer-readable memory generate a manufactured article including instruction means that implement the functions specified in one or more of the flows Figure 1 one or more of the flows and / or blocks Figure 1 or means for implementing the functions specified in one or more of the blocks.

[0117] These computer program instructions can also be loaded onto a computer or other programmable data processing device, such that a series of operation steps are performed on the computer or other programmable device to generate a computer-implemented process, and thus the instructions executed on the computer or other programmable device provide steps for implementing the functions specified in one or more of the flows Figure 1 one or more of the flows and / or blocks Figure 1 or means for implementing the functions specified in one or more of the blocks.

[0118] The embodiments of the present invention have been described above in conjunction with the accompanying drawings. However, the present invention is not limited to the above specific embodiments. The above specific embodiments are merely illustrative and not restrictive. Under the inspiration of the present invention, those of ordinary skill in the art can also make many forms without departing from the spirit and scope of the present invention as defined by the claims. All of these fall within the protection scope of the present invention.

[0119] The above shows and describes the basic principles, main features, and advantages of the present invention. Those skilled in the art of this industry should understand that the present invention is not limited by the above embodiments. The above embodiments and the descriptions in the specification only illustrate the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention will have various changes and improvements, and all of these changes and improvements fall within the scope of the present invention claimed. The scope of protection claimed by the present invention is defined by the appended claims and their equivalents.

Claims

1. A strut system for suppressing the deformation of a flexible wind turbine blade, characterized in that, It includes a rotating bin and multiple support rods; The rotating bin and the wind turbine tower barrel are respectively located on both sides of the wind turbine blade, and the rotating bin is in transmission connection with the wind turbine hub; One end of the support rod is connected to the wind turbine blade, and the other end is connected to the rotating bin; The rotating bin is cylindrical, the rotating bin and the wind turbine hub are coaxial, and the side surface of the rotating bin is provided with openings; The support rod is inserted into the opening on the side surface of the rotating bin and fixedly connected to the rotating bin; The support rod includes a buffer rod, a buffer cylinder and a shock-absorbing spring; the shock-absorbing spring is arranged in the buffer cylinder and is respectively connected to the buffer rod and the buffer cylinder at both ends; the buffer rod is inserted into the buffer cylinder and is slidably connected to the buffer cylinder and is connected to the rotating bin; the buffer cylinder is connected to the wind turbine blade; A fixed-end slide rail is arranged on the wind turbine blade; a side column is slidably connected to the fixed-end slide rail; the side column and the support rod are hinged through a spherical hinge; The optimization method for the connection position between the support rod and the wind turbine blade includes, Simplifying the wind turbine blade into a cantilever beam; Constructing a finite element model with the starting point of the cantilever beam fixed, the end of the support rod close to the starting point of the cantilever beam fixed, and the other end hinged to the cantilever beam; Applying a preset wind pressure to the cantilever beam; Analyzing the deflection, shear force, bending moment and rotation angle of the cantilever beam when the connection position between the support rod and the cantilever beam is different through finite element analysis; Optimizing the connection position between the support rod and the cantilever beam according to the deflection, shear force, bending moment and rotation angle of the cantilever beam to obtain the connection position between the support rod and the wind turbine blade, including: Fitting formula for the hinge position x of the strut and the shear force y1: y1 = 74067.96709 + (-1.4633×10 7 / π)×(63.11979 / (4×(x - 5.21773)^2 + 63.11979^2)); The fitting formula between the hinge position x of the support rod and the deflection y2: y2 = 9.50499*10-4 + (-0.33734 / π)*(112.91911 / (4*(x - 5.40042)^2 + 112.91911^2)); Weighting the shear force and deflection of the rod under different working conditions in a 1:1 ratio, comparing with the working condition without the support rod, obtaining the reduction amount of shear force and displacement under each working condition, fitting the reduction amount, and according to the fitting result, it is optimal to arrange the support rod at the 9 / 16 position of the wind turbine blade.

2. The strut system for suppressing the deformation of a flexible wind turbine blade according to claim 1, wherein The number of the support rods is the same as that of the wind turbine blades, and the support rods and the wind turbine blades correspond one by one.

3. The strut system for suppressing the deformation of a flexible wind turbine blade according to claim 2, wherein The lengths of the multiple support rods are equal, and the angles between the support rods are equal; the end of the wind turbine blade connected to the wind turbine hub is recorded as the starting point, and the tip of the wind turbine blade is recorded as the end point, and the connection positions of the support rods and the wind turbine blades are the same.

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