Blade pre-bending amount determination method and device, storage medium and electronic equipment

Abstract

The embodiment of the invention provides a blade pre-bending amount determination method and device, a storage medium and electronic equipment, and the method comprises the steps: determining a first relational expression between a blade tip pre-bending amount and a blade root bending moment variation; determining a second relational expression between the blade root bending moment variable quantity and the blade tip deformation variable quantity; determining an additional clearance reduction value according to the first relational expression and the second relational expression, and determining a blade tip pre-bending quantity demand value; and the target blade tip pre-bending amount is determined according to the additional clearance reduction value and the blade tip pre-bending amount demand value. According to the method, the problem that the pre-bending amount of the blade cannot be determined in the prior art can be solved.

Description

Technical Field

[0001] The present application relates to the field of wind turbine blades, and in particular, to a method and device for determining a blade pre-bend amount, a storage medium, and an electronic device. Background Art

[0002] As the blades continue to grow, they become more flexible. The blade tips are increasingly sweeping the tower. In order to reduce the risk of blade sweeping the tower, existing blades are designed with blade tip pre-bends. However, there is no good way to design the blade tip pre-bend amount. It is mainly done by initially giving a smaller pre-bend amount for calculation and analysis, and then checking whether the blade tip pre-bend amount meets the design requirements. If not, the blade structure ply is increased or adjusted. However, due to the mutual influence between the blade tip pre-bend amount and the blade structure ply and load, the above method is very time-consuming and may not meet the clearance design requirements of the unit.

[0003] With regard to the problem in the related art that the pre-bending amount of the blade cannot be determined, no effective solution has been proposed so far.

[0004] Therefore, it is necessary to improve the related technology to overcome the above-mentioned defects in the related technology. Summary of the invention

[0005] The embodiments of the present application provide a method and device for determining the amount of blade pre-bending, a storage medium, and an electronic device, so as to at least solve the problem in the related art that the amount of blade pre-bending cannot be determined.

[0006] According to one embodiment of the present application, a method for determining the amount of blade pre-bending is provided, including: determining a first relationship between the amount of blade tip pre-bending and the amount of change in blade root bending moment; and determining a second relationship between the amount of change in blade root bending moment and the amount of change in blade tip deformation; determining an additional clearance reduction value based on the first relationship and the second relationship, and determining a required value for blade tip pre-bending; determining a target blade tip pre-bending amount based on the additional clearance reduction value and the required value for blade tip pre-bending.

[0007] In an exemplary embodiment, determining a first relationship between the blade tip pre-bend amount and the blade root bending moment change includes: obtaining multiple blade pre-bend amounts based on a preset step size; determining a first blade root bending moment under a first operating condition corresponding to a rated wind speed, and determining each second blade root bending moment corresponding to each blade tip pre-bend amount under the first operating condition; determining the blade root bending moment change according to each first quotient value of each second blade root bending moment and the first blade root bending moment; determining the first relationship according to the corresponding relationship between each blade tip pre-bend amount and each second blade root bending moment and each blade root bending moment change.

[0008] In an exemplary embodiment, determining a second relationship between a change in blade root bending moment and a change in blade tip deformation includes: acquiring multiple blade pre-bending amounts based on a preset step size; determining a first blade root bending moment and a first blade tip deformation under a first operating condition corresponding to a rated wind speed, and determining each second blade root bending moment and each second blade tip deformation corresponding to each blade tip pre-bending amount under the first operating condition; determining the blade root bending moment change according to each first quotient value of each second blade root bending moment and the first blade root bending moment, and determining the blade tip deformation change according to a second quotient value between each second blade tip deformation and the first blade tip deformation; and fitting the corresponding relationship between the blade root bending moment change and the blade tip deformation change according to a quadratic polynomial to determine the second relationship.

[0009] In an exemplary embodiment, determining an additional clearance reduction value according to the first relationship and the second relationship includes: determining a corresponding relationship between each blade tip pre-bending amount and each blade tip deformation change amount according to the first relationship and the second relationship, and obtaining a third blade tip deformation amount under a second working condition corresponding to a minimum distance between the blade tip and the tower; determining the additional clearance reduction value according to the corresponding relationship and the third blade tip deformation amount, wherein the additional clearance reduction value=L i-(D i / D1-1)×D0, L i is the blade tip pre-bending amount, D i / D1 is the blade tip deformation change amount, and D0 is the third blade tip deformation amount.

[0010] In an exemplary embodiment, determining a blade tip pre-bending amount requirement value includes: obtaining a preset clearance requirement value and determining a minimum distance between the blade tip and a tower; calculating a difference between the preset clearance requirement value and the minimum distance, and determining the difference as the blade tip pre-bending amount requirement value.

[0011] In an exemplary embodiment, a target blade tip pre-bend amount is determined based on the additional clearance reduction value and the blade tip pre-bend amount requirement value, including: presetting an equivalence relationship between the additional clearance reduction value and the blade tip pre-bend amount requirement value; and determining the target blade tip pre-bend amount based on the equivalence relationship.

[0012] According to another embodiment of the present application, a device for determining the amount of blade pre-bending is provided, comprising: a first determination module, used to determine a first relationship between the amount of blade tip pre-bending and the amount of change in blade root bending moment; and, to determine a second relationship between the amount of change in blade root bending moment and the amount of change in blade tip deformation; a second determination module, used to determine an additional clearance reduction value based on the first relationship and the second relationship, and to determine a required value for the amount of blade tip pre-bending; and a third determination module, used to determine a target amount of blade tip pre-bending based on the additional clearance reduction value and the required value for the amount of blade tip pre-bending.

[0013] According to another embodiment of the present application, a computer-readable storage medium is provided, in which a computer program is stored, wherein the computer program is configured to execute the steps of any of the above method embodiments when run.

[0014] According to another embodiment of the present application, an electronic device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0015] According to another embodiment of the present application, a computer program product is provided, including a computer program, and when the computer program is executed by a processor, the steps in any of the above method embodiments are implemented.

[0016] Through the embodiment of the present application, the first relationship between the blade pre-bending amount and the blade root bending moment change is determined, and the second relationship between the blade root bending moment change and the blade tip change is determined; the additional clearance reduction value is determined according to the first relationship and the second relationship, and the blade tip pre-bending amount requirement value is determined; the target blade tip pre-bending amount is determined according to the additional clearance reduction value and the blade tip pre-bending amount requirement value. That is, the embodiment of the present application calculates the additional clearance distance reduced due to the change in structural response under the pre-bending design, that is, the additional clearance reduction value, by determining the first relationship between the blade tip pre-bending amount and the blade root bending moment change, and the second relationship between the blade root bending moment change and the blade tip deformation change. At the same time, the required value of the blade tip pre-bending amount is determined based on the difference between the clearance design requirement value and the minimum clearance distance of the initial design blade. The target blade tip pre-bending amount is determined by comparing and analyzing the additional clearance reduction value and the blade tip pre-bending amount requirement. Through the embodiment of the present application, the problem that the blade pre-bending amount cannot be determined in the related art can be solved. Then, the target blade tip pre-bend that can meet the structural strength requirements and ensure sufficient safety clearance can be accurately found, thereby improving the overall design level of wind turbine blades. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0018] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0019] Figure 1 It is a hardware structure block diagram of a computer terminal device of a method for determining a blade pre-bending amount in an embodiment of the present application;

[0020] Figure 2 is a flow chart of a method for determining a blade pre-bending amount according to an embodiment of the present application;

[0021] Figure 3 It is a structural block diagram of a device for determining a blade pre-bending amount according to an embodiment of the present application. DETAILED DESCRIPTION

[0022] The embodiments of the present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0023] It should be noted that the terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence.

[0024] The method embodiments provided in the embodiments of the present application can be executed in a computer terminal device or a similar computing device. Taking running on a computer terminal device as an example, Figure 1 1 is a hardware structure block diagram of a computer terminal device for determining a blade pre-bending amount in an embodiment of the present application. Figure 1 As shown, the computer terminal device may include one or more ( Figure 1 Only one is shown in the figure) a processor 102 (the processor 102 may include but is not limited to a processing device such as a microprocessor MCU or a programmable logic device FPGA) and a memory 104 for storing data, wherein the above-mentioned computer terminal device may also include a transmission device 106 and an input and output device 108 for communication functions. It can be understood by those skilled in the art that Figure 1 The structure shown is only for illustration and does not limit the structure of the above-mentioned computer terminal device. Figure 1 More or fewer components as shown, or with Figure 1 Different configurations are shown.

[0025] The memory 104 can be used to store computer programs, for example, software programs and modules of application software, such as the computer program corresponding to the method for determining the blade pre-bending amount in the embodiment of the present application. The processor 102 executes various functional applications and data processing by running the computer program stored in the memory 104, that is, to implement the above method. The memory 104 may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memory. In some examples, the memory 104 may further include a memory remotely arranged relative to the processor 102, and these remote memories may be connected to the computer terminal device via a network. Examples of the above-mentioned network include, but are not limited to, the Internet, an intranet, a local area network, a mobile communication network, and combinations thereof.

[0026] The transmission device 106 is used to receive or send data via a network. The above-mentioned network specific examples may include a wireless network provided by a communication provider of a computer terminal device. In one example, the transmission device 106 includes a network adapter (Network Interface Controller, referred to as NIC), which can be connected to other network devices through a base station so as to communicate with the Internet. In one example, the transmission device 106 can be a radio frequency (RF) module, which is used to communicate with the Internet wirelessly.

[0027] In this embodiment, a method for determining the pre-bending amount of a blade is provided. Figure 2 is a flow chart of a method for determining a blade pre-bending amount according to an embodiment of the present application. Figure 2 As shown, the process includes the following steps:

[0028] Step S202, determining a first relationship between the blade tip pre-bending amount and the blade root bending moment variation; and determining a second relationship between the blade root bending moment variation and the blade tip deformation variation;

[0029] Step S204, determining an additional clearance reduction value according to the first relationship and the second relationship, and determining a blade tip pre-bending amount requirement value;

[0030] Step S206: determining a target blade tip pre-bending amount according to the additional clearance reduction value and the blade tip pre-bending amount requirement value.

[0031] Through the above steps, the first relationship between the blade pre-bending amount and the blade root bending moment change is determined, and the second relationship between the blade root bending moment change and the blade tip change is determined; the additional clearance reduction value is determined according to the first relationship and the second relationship, and the blade tip pre-bending amount requirement value is determined; the target blade tip pre-bending amount is determined according to the additional clearance reduction value and the blade tip pre-bending amount requirement value. That is to say, the embodiment of the present application calculates the additional clearance distance reduced due to the change in structural response under the pre-bending design, that is, the additional clearance reduction value, by determining the first relationship between the blade tip pre-bending amount and the blade root bending moment change, and the second relationship between the blade root bending moment change and the blade tip deformation change. At the same time, the required value of the blade tip pre-bending amount is determined based on the difference between the clearance design requirement value and the minimum clearance distance of the initial design blade. The target blade tip pre-bending amount is determined by comparing and analyzing the additional clearance reduction value and the blade tip pre-bending amount requirement. Through the embodiment of the present application, the problem that the blade pre-bending amount cannot be determined in the related art can be solved. Then, the target blade tip pre-bend that can meet the structural strength requirements and ensure sufficient safety clearance can be accurately found, thereby improving the overall design level of wind turbine blades.

[0032] Optionally, the above-mentioned step S202 of determining the first relationship between the blade tip pre-bending amount and the blade root bending moment change includes: obtaining multiple blade pre-bending amounts based on a preset step size; determining the first blade root bending moment under the first operating condition corresponding to the rated wind speed, and determining each second blade root bending moment corresponding to each blade tip pre-bending amount under the first operating condition; determining the blade root bending moment change according to each first quotient value of each second blade root bending moment and the first blade root bending moment; determining the first relationship according to the corresponding relationship between each blade tip pre-bending amount and each second blade root bending moment and each blade root bending moment change.

[0033] It is understandable that in the design process of wind turbine blades, a series of scientific methods can be used to accurately calculate the influence of the tip pre-bending on the root bending moment and tip deformation. Specifically:

[0034] Preset step length to obtain multiple blade pre-bend amounts: During the design process, we do not blindly set the pre-bend amount, but systematically adjust the pre-bend degree of the blade tip according to a certain step length (such as every 20mm increase). This ensures the continuity of the data and the comprehensiveness of the calculation.

[0035] Determine the first working condition and the first blade root bending moment under rated wind speed: Select the typical rated wind speed working condition when the wind turbine is running as the reference condition, and calculate the blade root bending moment (first blade root bending moment) of the straight blade (i.e. the blade without pre-bending) under this working condition. The blade root bending moment is an important indicator for evaluating the blade structural load, which can reflect the stress borne by the blade.

[0036] Calculate the second blade root bending moment under different pre-bending amounts: Under the selected first working condition (rated wind speed), for each blade designed with pre-bending amount Li, calculate its blade root bending moment (second blade root bending moment) separately. These bending moment values ​​reflect the specific impact of the pre-bending design on the load distribution of the blade under rated wind speed.

[0037] Determine the change in blade root bending moment: Calculate the ratio of each second blade root bending moment to the first blade root bending moment to obtain the change in blade root bending moment corresponding to each pre-bending amount Li. This change can intuitively reflect the adjustment effect of the pre-bending amount on the blade root bending moment.

[0038] Establishing the first relationship: Based on the corresponding relationship between each blade tip pre-bending amount Li and its corresponding blade root bending moment change, a statistical analysis method (such as linear regression) is used to establish a relationship between the blade tip pre-bending amount and the blade root bending moment change. This relationship can be linear and is used to predict how the blade root bending moment changes under a specific pre-bending amount Li.

[0039] Through the above steps, we can systematically understand the specific impact of pre-bending on blade structural load, providing a powerful tool for the optimal design of wind turbine blades. This method not only improves the accuracy of the design, but also effectively reduces the design cycle, avoids unnecessary trial and error, and ensures the safety and performance of the blades in complex operating environments.

[0040] Optionally, the above-mentioned step S202 of determining the second relationship between the change in blade root bending moment and the change in blade tip deformation includes: obtaining multiple blade pre-bending amounts based on a preset step size; determining the first blade root bending moment and the first blade tip deformation under the first operating condition corresponding to the rated wind speed, and determining each second blade root bending moment and each second blade tip deformation corresponding to each blade tip pre-bending amount under the first operating condition; determining the blade root bending moment change according to each first quotient value of each second blade root bending moment and the first blade root bending moment, and determining the blade tip deformation change according to the second quotient value between each second blade tip deformation and the first blade tip deformation; fitting the corresponding relationship between the blade root bending moment change and the blade tip deformation change according to a quadratic polynomial to determine the second relationship.

[0041] It is understandable that in the design and optimization process of wind turbine blades, it is crucial to determine the influence of the pre-bending amount on the blade root bending moment and blade tip deformation. Specifically:

[0042] Obtain multiple blade pre-bends based on preset step sizes: A pre-bend step size is selected, such as 10mm increments, and a series of pre-bend parameters are systematically generated in this way. This step ensures a comprehensive analysis of the impact of pre-bend, covering the range from minor adjustments to major changes.

[0043] Determine the bending moment and deformation of the first working condition at rated wind speed: Select the standard working condition (such as rated wind speed) in the operation of the wind turbine, and calculate the blade root bending moment (first blade root bending moment) and blade tip deformation (first blade tip deformation) of the blade under this state. These initial data are used as a comparison benchmark to evaluate the impact of the pre-bending adjustment.

[0044] Calculate the blade root bending moment and blade tip deformation under different pre-bending amounts: Under the selected first working condition (rated wind speed), for each preset blade tip pre-bending amount Li, calculate the corresponding blade root bending moment (second blade root bending moment Mi) and blade tip deformation (second blade tip deformation Di). These data reflect the specific impact of the change in pre-bending amount on the blade structural performance.

[0045] Determine the changes in blade root bending moment and blade tip deformation: By comparing the ratio of the second blade root bending moment Mi to the first blade root bending moment M1, the change in blade root bending moment is determined. Similarly, by comparing the ratio of the second blade tip deformation Di to the first blade tip deformation D1, the change in blade tip deformation is determined. These two changes intuitively reflect the adjustment effect of the pre-bending design on blade load and deformation.

[0046] The second relationship is determined by quadratic polynomial fitting: Based on the correspondence between the change in blade root bending moment and the change in blade tip deformation, a mathematical model between the two is established using the quadratic polynomial fitting method. This nonlinear relationship can more accurately describe how the change in blade root bending moment further affects the tip deformation after the pre-bending amount is adjusted. Ultimately, this relationship (the second relationship) provides designers with a tool to predict and optimize the tip deformation, ensuring that the blade can still meet the safe operation requirements under the pre-bending design, while avoiding the additional load and structural complexity caused by excessive pre-bending.

[0047] Through the above technical solution, the pre-bending amount can be finely adjusted to achieve the purpose of balancing the tip deformation, root load and clearance safety requirements, thereby improving the overall design quality and operating efficiency of wind turbine blades.

[0048] Optionally, the above-mentioned step S204 of determining the additional clearance reduction value according to the first relationship and the second relationship includes: determining the corresponding relationship between each blade tip pre-bending amount and each blade tip deformation change amount according to the first relationship and the second relationship, and obtaining the third blade tip deformation amount under the second working condition corresponding to the minimum distance between the blade tip and the tower; determining the additional clearance reduction value according to the corresponding relationship and the third blade tip deformation amount, wherein the additional clearance reduction value = Li-(Di / D1-1)×D0, Li is the blade tip pre-bending amount, Di / D1 is the blade tip deformation change amount, and D0 is the third blade tip deformation amount.

[0049] It can be understood that in the design of wind turbine blades, the comprehensive influence of the pre-bending amount on the blade tip deformation is determined by the established first relationship and the second relationship, and the specific steps of calculating the additional clearance reduction value include:

[0050] The corresponding relationship is determined according to the first and second relationship formulas: the first relationship formula describes the connection between the blade tip pre-bending amount Li and the blade root bending moment change, while the second relationship formula expresses the nonlinear relationship between the blade root bending moment change and the blade tip deformation change Di / D1. By combining these two relationship formulas, a specific mathematical model between the blade tip pre-bending amount Li and the blade tip deformation change Di / D1 can be established, that is, the expected change of blade tip deformation under each pre-bending amount Li is obtained.

[0051] Obtain the tip deformation under the working condition corresponding to maintaining the minimum distance: During the design process, we also need to determine the tip deformation (the third tip deformation D0) of the straight blade when designing under the second working condition (i.e., the working condition where the minimum safe distance between the blade and the tower needs to be maintained).

[0052] Determine the additional clearance reduction value: Based on the corresponding relationship established above and the third blade tip deformation D0, the designer can calculate the additional clearance reduction value under each pre-bending amount Li. This value is determined by the formula "Additional clearance reduction value = Li-(Di / D1-1)×D0", where Li represents a certain pre-bending amount, and Di / D1 represents the ratio of the blade tip deformation Di under the pre-bending amount to the blade tip deformation D1 under the straight blade state. Subtracting 1 and multiplying by D0 is actually quantifying the impact of the pre-bending amount Li on the blade tip deformation under the second working condition, and how this impact is converted into a reduction in the clearance distance between the blade and the tower.

[0053] Among them, in the formula Li-(Di / D1-1)×D0, Li is the direct increase in pre-bending, and (Di / D1-1)×D0 is the additional clearance loss caused by the increase in tip deformation after pre-bending. Subtracting the pre-bending amount Li from this "loss" value, the result is the actual increase in clearance between the blade and the tower, taking into account the deformation change caused by pre-bending.

[0054] Through the above technical solution, the actual impact of different pre-bending amounts Li on the safe clearance between the blade and the tower can be accurately evaluated, ensuring that the pre-bending design can not only improve the dynamic performance of the blade, but also maintain sufficient safe clearance to avoid possible tower sweep risks during operation.

[0055] Optionally, determining the blade tip pre-bending amount requirement value in the above step S204 includes: obtaining a preset clearance requirement value and determining a minimum distance between the blade tip and the tower; calculating a difference between the preset clearance requirement value and the minimum distance, and determining the difference as the blade tip pre-bending amount requirement value.

[0056] It is understandable that in the design process of wind turbine blades, ensuring that there is sufficient clearance between the blades and the tower when they are in operation is a critical safety consideration. Specifically:

[0057] Get the preset clearance requirement value La: This is the minimum clearance distance requirement between the blade tip and the tower determined based on the specific conditions, operating specifications and safety standards of the wind farm. The setting of La ensures that the blade will not contact the tower under various operating conditions, avoids the risk of tower sweeping, and ensures the safe operation of the wind power system.

[0058] Determine the minimum distance L0 between the blade tip and the tower: In the preliminary design stage, calculate or measure the minimum distance L0 between the blade tip and the tower when the blade is in a straight (no pre-bend) state. This step is based on the static structural characteristics of the blade and reflects the safe distance between the blade and the tower before pre-bend design optimization is performed.

[0059] Calculate the difference between the preset clearance requirement La and the minimum distance L0: The difference (La-L0) directly reflects the distance that the blade tip pre-bend design needs to compensate in order to achieve the preset clearance safety standard.

[0060] The above difference is determined as the required value of the blade tip pre-bend: The difference (La-L0) essentially becomes the design target, which means that the designer needs to adjust the pre-bend of the blade to ensure that the clearance distance between the blade tip and the tower is at least increased to La-L0 during operation. This means that the pre-bend design must not only optimize the aerodynamic performance of the blade, but also ensure that the clearance safety requirements are met while considering the structural deformation.

[0061] Through the above technical solution, the required value of the blade tip pre-bending amount can be scientifically and accurately determined to meet the preset clearance requirements. This method effectively avoids the risk of structural overload caused by excessive pre-bending, and also prevents the hidden danger of tower sweeping caused by insufficient pre-bending.

[0062] Optionally, the above-mentioned step S206 of determining the target blade tip pre-bend amount according to the additional clearance reduction value and the blade tip pre-bend amount requirement value includes: presetting an equivalence relationship between the additional clearance reduction value and the blade tip pre-bend amount requirement value; and determining the target blade tip pre-bend amount according to the equivalence relationship.

[0063] It is understandable that in the pre-bending optimization stage of wind turbine blade design, determining the target blade tip pre-bending amount is the key to ensuring a safe clearance distance between the blade and the tower. Specifically:

[0064] Preset Equivalence Relationship: Set an equivalence relationship, i.e., a mathematical equation between the additional clearance reduction value and the blade tip prebend requirement value. This setting is based on the calculations and analysis described above, where the additional clearance reduction value reflects the actual impact of the blade tip deformation caused by the prebend design on the clearance distance, and the blade tip prebend requirement value is determined based on the difference between the preset clearance requirement and the current minimum clearance distance.

[0065] Understand the relationship between the additional clearance reduction value and the blade tip pre-bending requirement value: The additional clearance reduction value calculation formula is Li-(D i / D1-1)×D0, which indicates that the tip pre-bending amount Li is the actual reduction in clearance distance caused by the increase in tip deformation while increasing the pre-bending amount. The tip pre-bending requirement La-L0 is the additional pre-bending distance required by the blade tip in order to achieve the preset clearance requirement. The ideal design state is that the increase in pre-bending amount just offsets the clearance distance consumed by the increase in deformation caused by it, that is, Li-(D i / D1-1)×D0=La-L0.

[0066] Determine the target tip pre-bend amount based on the equivalent relationship: By adjusting the tip pre-bend amount Li, the above equivalent relationship is established, that is, find a value of the pre-bend amount Li so that the increase in the clearance distance caused by the increase in the pre-bend amount is exactly equal to the clearance distance consumed by the increase in tip deformation caused by the pre-bend. The Li value that meets this condition is the target tip pre-bend amount.

[0067] The above technical solution is essentially to find an optimal pre-bending design point so that the clearance distance between the blade tip and the tower meets the preset safety standard while meeting the aerodynamic performance and structural strength requirements of the wind turbine blade. By setting this equivalent relationship and determining the target tip pre-bending amount accordingly, it is possible to achieve precise control of the pre-bending amount, avoid insufficient or excessive pre-bending, and ensure the safety and stability of wind turbine blades under various operating conditions. This is an important optimization strategy in wind turbine blade design.

[0068] In order to better understand the process of the above-mentioned method for determining the blade pre-bending amount, the implementation method flow of the above-mentioned method for determining the blade pre-bending amount is described below in combination with an optional embodiment, but it is not used to limit the technical solution of the embodiment of the present application.

[0069] At present, there is no good way to design the blade tip pre-bend. It is mainly to calculate and analyze by initially giving a smaller pre-bend, and then check whether the blade tip pre-bend meets the design requirements. If not, the blade structure layer is further increased or adjusted. However, due to the mutual influence between the blade tip pre-bend, the blade structure layer and the load, the above method is very time-consuming and may not meet the clearance design requirements of the unit.

[0070] In order to solve this problem, it is necessary to fully consider the mutual influence between the tip pre-bend amount and the blade structure lamination and load during the initial design of the blade, and provide a pre-bend amount that meets the design requirements. To this end, an optional embodiment of the present application proposes a method for quickly determining the maximum tip pre-bend amount of a wind turbine blade.

[0071] 1) Design a straight blade that meets the design requirements using the existing method, obtain the current minimum distance L0 between the blade tip and the tower and the blade tip deformation D0 under the corresponding working condition, the blade root bending moment M1 and the blade tip deformation D1 under the rated wind speed condition during steady-state operation;

[0072] 2) Select the rated wind speed condition during steady-state operation and calculate the blade root bending moment Mi and blade tip deformation Di at different blade tip pre-bending amounts Li;

[0073] 3) The relationship between Li and Mi / M1 is obtained by linear fitting (i.e., the first relationship);

[0074] 4) The relationship between Mi / M1 and Di / D1 (i.e., the second relationship) is obtained by fitting a quadratic polynomial;

[0075] 5) According to the load change Mi / M1 caused by pre-bending, calculate the additional clearance reduction value caused by it as (D i / D1-1)*D0;

[0076] 6) The clearance increase value when the pre-bending amount is Li is Li-(Di / D1-1)*D0;

[0077] 7) Calculate the blade tip pre-bending requirement La-L0 based on the clearance design requirement La;

[0078] 8) When Li-(Di / D1-1)*D0 is equal to La-L0, it is the required blade tip pre-bend amount Li (i.e., the target blade tip pre-bend amount).

[0079] Through the description of the above implementation methods, those skilled in the art can clearly understand that the method according to the above embodiment can be implemented by means of software plus a necessary general hardware platform, and of course by hardware, but in many cases the former is a better implementation method. Based on this understanding, the technical solution of the present application, or the part that contributes to the prior art, can be embodied in the form of a software product, which is stored in a storage medium (such as ROM / RAM, magnetic disk, optical disk), and includes a number of instructions for a terminal device (which can be a mobile phone, computer, server, or network device, etc.) to execute the methods described in each embodiment of the present application.

[0080] In this embodiment, a device for determining the amount of blade pre-bending is also provided, and the device is used to implement the above-mentioned embodiments and preferred embodiments, and the descriptions that have been made will not be repeated. As used below, the term "module" can implement a combination of software and / or hardware for a predetermined function. Although the device described in the following embodiments is preferably implemented in software, the implementation of hardware, or a combination of software and hardware, is also possible and conceivable.

[0081] Figure 3 is a structural block diagram of a device for determining a blade pre-bending amount according to an embodiment of the present application, such as Figure 3 As shown, the device comprises:

[0082] A first determination module 32 is used to determine a first relationship between the blade tip pre-bending amount and the blade root bending moment change amount; and to determine a second relationship between the blade root bending moment change amount and the blade tip deformation change amount;

[0083] A second determination module 34, configured to determine an additional clearance reduction value according to the first relationship and the second relationship, and determine a blade tip pre-bending amount requirement value;

[0084] The third determination module 36 is configured to determine a target blade tip pre-bend amount according to the additional clearance reduction value and the blade tip pre-bend amount requirement value.

[0085] Through the above-mentioned device, the first relationship between the blade pre-bending amount and the blade root bending moment change is determined, and the second relationship between the blade root bending moment change and the blade tip change is determined; the additional clearance reduction value is determined according to the first relationship and the second relationship, and the blade tip pre-bending amount requirement value is determined; the target blade tip pre-bending amount is determined according to the additional clearance reduction value and the blade tip pre-bending amount requirement value. That is to say, the embodiment of the present application calculates the clearance distance that is additionally reduced due to the change in structural response under the pre-bending design, that is, the additional clearance reduction value, by determining the first relationship between the blade tip pre-bending amount and the blade root bending moment change, and the second relationship between the blade root bending moment change and the blade tip deformation change. At the same time, the required value of the blade tip pre-bending amount is determined based on the difference between the clearance design requirement value and the minimum clearance distance of the initial design blade. The target blade tip pre-bending amount is determined by comparing and analyzing the additional clearance reduction value and the blade tip pre-bending amount requirement. Through the embodiment of the present application, the problem that the blade pre-bending amount cannot be determined in the related art can be solved. Then, the target blade tip pre-bend that can meet the structural strength requirements and ensure sufficient safety clearance can be accurately found, thereby improving the overall design level of wind turbine blades.

[0086] In an exemplary embodiment, the first determination module 32 is also used to obtain multiple blade pre-bending amounts based on a preset step size; determine the first blade root bending moment under the first operating condition corresponding to the rated wind speed, and determine each second blade root bending moment corresponding to each blade tip pre-bending amount under the first operating condition; determine the blade root bending moment change according to each first quotient value of each second blade root bending moment and the first blade root bending moment; determine the first relationship according to the corresponding relationship between each blade tip pre-bending amount and each second blade root bending moment and each blade root bending moment change.

[0087] In an exemplary embodiment, the first determination module 32 is also used to obtain multiple blade pre-bending amounts based on a preset step size; determine the first blade root bending moment and the first blade tip deformation under the first operating condition corresponding to the rated wind speed, and determine each second blade root bending moment and each second blade tip deformation corresponding to each blade tip pre-bending amount under the first operating condition; determine the blade root bending moment change according to each first quotient value of each second blade root bending moment and the first blade root bending moment, and determine the blade tip deformation change according to the second quotient value between each second blade tip deformation and the first blade tip deformation; fit the corresponding relationship between the blade root bending moment change and the blade tip deformation change according to a quadratic polynomial to determine the second relationship.

[0088] In an exemplary embodiment, the second determination module 34 is further used to determine the corresponding relationship between each blade tip pre-bending amount and each blade tip deformation change amount according to the first relationship and the second relationship, and obtain the third blade tip deformation amount under the second working condition corresponding to the minimum distance between the blade tip and the tower; determine the additional clearance reduction value according to the corresponding relationship and the third blade tip deformation amount, wherein the additional clearance reduction value = Li-(Di / D1-1)×D0, Li is the blade tip pre-bending amount, Di / D1 is the blade tip deformation change amount, and D0 is the third blade tip deformation amount.

[0089] In an exemplary embodiment, the second determination module 34 is further used to obtain a preset clearance requirement value and determine a minimum distance between the blade tip and the tower; calculate a difference between the preset clearance requirement value and the minimum distance, and determine the difference as the blade tip pre-bending amount requirement value.

[0090] In an exemplary embodiment, the third determination module 36 is further configured to preset an equivalence relationship between the additional clearance reduction value and the blade tip pre-bend amount requirement value; and determine the target blade tip pre-bend amount according to the equivalence relationship.

[0091] It should be noted that the above modules can be implemented by software or hardware. For the latter, it can be implemented in the following ways, but not limited to: the above modules are all located in the same processor; or the above modules are located in different processors in any combination.

[0092] An embodiment of the present application further provides a computer-readable storage medium, in which a computer program is stored, wherein the computer program is configured to execute the steps of any of the above method embodiments when running.

[0093] Optionally, in this embodiment, the storage medium may be configured to store program codes for executing the following steps:

[0094] S1, determining a first relationship between the blade tip pre-bending amount and the blade root bending moment change amount; and determining a second relationship between the blade root bending moment change amount and the blade tip deformation change amount;

[0095] S2, determining an additional clearance reduction value according to the first relationship and the second relationship, and determining a blade tip pre-bending amount requirement value;

[0096] S3, determining a target blade tip pre-bending amount according to the additional clearance reduction value and the blade tip pre-bending amount requirement value.

[0097] In an exemplary embodiment, the computer-readable storage medium may include, but is not limited to, various media that can store computer programs, such as a USB flash drive, a read-only memory (ROM), a random access memory (RAM), a mobile hard disk, a magnetic disk or an optical disk.

[0098] An embodiment of the present application further provides an electronic device, including a memory and a processor, wherein a computer program is stored in the memory, and the processor is configured to run the computer program to execute the steps in any one of the above method embodiments.

[0099] In an exemplary embodiment, the electronic device may further include a transmission device and an input / output device, wherein the transmission device is connected to the processor, and the input / output device is connected to the processor.

[0100] Optionally, in this embodiment, the processor may be configured to perform the following steps through a computer program:

[0101] S1, determining a first relationship between the blade tip pre-bending amount and the blade root bending moment change amount; and determining a second relationship between the blade root bending moment change amount and the blade tip deformation change amount;

[0102] S2, determining an additional clearance reduction value according to the first relationship and the second relationship, and determining a blade tip pre-bending amount requirement value;

[0103] S3, determining a target blade tip pre-bending amount according to the additional clearance reduction value and the blade tip pre-bending amount requirement value.

[0104] An embodiment of the present application further provides a computer program product, which includes a computer program. When the computer program is executed by a processor, the steps in any one of the above method embodiments are implemented.

[0105] An embodiment of the present application further provides another computer program product, including a non-volatile computer-readable storage medium, wherein the non-volatile computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps in any of the above method embodiments are implemented.

[0106] An embodiment of the present application also provides a computer program, which includes computer instructions stored in a computer-readable storage medium; a processor of a computer device reads the computer instructions from the computer-readable storage medium, and the processor executes the computer instructions, so that the computer device performs the steps in any one of the above method embodiments.

[0107] Optionally, in this embodiment, the processor may be configured to perform the following steps through a computer program:

[0108] S1, determining a first relationship between the blade tip pre-bending amount and the blade root bending moment change amount; and determining a second relationship between the blade root bending moment change amount and the blade tip deformation change amount;

[0109] S2, determining an additional clearance reduction value according to the first relationship and the second relationship, and determining a blade tip pre-bending amount requirement value;

[0110] S3, determining a target blade tip pre-bending amount according to the additional clearance reduction value and the blade tip pre-bending amount requirement value.

[0111] For specific examples in this embodiment, reference may be made to the examples described in the above embodiments and exemplary implementation modes, and this embodiment will not be described in detail herein.

[0112] Obviously, those skilled in the art should understand that the above modules or steps of the present application can be implemented by a general computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices, they can be implemented by a program code executable by a computing device, so that they can be stored in a storage device and executed by the computing device, and in some cases, the steps shown or described can be executed in a different order from that herein, or they can be made into individual integrated circuit modules, or multiple modules or steps therein can be made into a single integrated circuit module for implementation. Thus, the present application is not limited to any specific combination of hardware and software.

[0113] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the principles of the present application shall be included in the protection scope of the present application.

Claims

1. A method for determining a blade pre-bending amount, characterized in that: include: Determine a first relationship between the blade tip prebend amount and the blade root bending moment change amount; and, determining a second relationship between the change in blade root bending moment and the change in blade tip deformation; Determining an additional clearance reduction value according to the first relationship and the second relationship, and determining a blade tip pre-bending amount requirement value; A target blade tip pre-bend amount is determined according to the additional clearance reduction value and the blade tip pre-bend amount requirement value.

2. The method according to claim 1, characterized in that Determine the first relationship between the tip prebend amount and the blade root bending moment change, including: Acquire multiple blade pre-bending amounts based on a preset step length; Determine a first blade root bending moment under a first operating condition corresponding to a rated wind speed, and determine each second blade root bending moment corresponding to each blade tip pre-bending amount under the first operating condition; Determining the blade root bending moment variation according to each first quotient value of each second blade root bending moment and the first blade root bending moment; The first relational expression is determined according to the corresponding relationship between each blade tip pre-bending amount and each second blade root bending moment and the change amount of each blade root bending moment.

3. The method according to claim 1, characterized in that The second relationship between the blade root bending moment change and the blade tip deformation change is determined, including: Acquire multiple blade pre-bending amounts based on a preset step length; Determine a first blade root bending moment and a first blade tip deformation under a first operating condition corresponding to a rated wind speed, and determine each second blade root bending moment and each second blade tip deformation corresponding to each blade tip pre-bending amount under the first operating condition; determining the blade root bending moment variation according to each first quotient value of each second blade root bending moment and the first blade root bending moment, and determining the blade tip deformation variation according to a second quotient value between each second blade tip deformation and the first blade tip deformation; The corresponding relationship between the blade root bending moment change and the blade tip deformation change is fitted according to a quadratic polynomial to determine the second relationship.

4. The method according to claim 1, characterized in that: Determining the additional headroom reduction value according to the first relationship and the second relationship includes: Determine the corresponding relationship between each blade tip pre-bending amount and each blade tip deformation change amount according to the first relationship and the second relationship, and obtain the third blade tip deformation amount under the second working condition corresponding to the minimum distance between the blade tip and the tower; The additional clearance reduction value is determined according to the corresponding relationship and the third blade tip deformation, wherein the additional clearance reduction value=Li-(Di / D1-1)×D0, Li is the blade tip pre-bend amount, Di / D1 is the blade tip deformation change, and D0 is the third blade tip deformation.

5. The method according to claim 1, characterized in that Determine the required value of blade tip pre-bend, including: Get the preset clearance requirement and determine the minimum distance between the blade tip and the tower; The difference between the preset clearance requirement value and the minimum distance is calculated, and the difference is determined as the blade tip pre-bending amount requirement value.

6. The method according to claim 1, characterized in that Determining a target blade tip pre-bending amount according to the additional clearance reduction value and the blade tip pre-bending amount requirement value includes: Presetting an equal relationship between the additional clearance reduction value and the blade tip pre-bending amount requirement value; The target blade tip pre-bend amount is determined according to the equivalent relationship.

7. A device for determining the amount of blade pre-bending, characterized in that: include: A first determination module, used to determine a first relationship between the blade tip pre-bending amount and the blade root bending moment change amount; and, determining a second relationship between the change in blade root bending moment and the change in blade tip deformation; a second determination module, configured to determine an additional clearance reduction value according to the first relationship and the second relationship, and determine a blade tip pre-bending amount requirement value; The third determination module is used to determine a target blade tip pre-bend amount according to the additional clearance reduction value and the blade tip pre-bend amount requirement value.

8. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a stored program, wherein the program executes the method of any one of claims 1 to 6 when executed.

9. An electronic device, comprising a memory and a processor, characterized in that: A computer program is stored in the memory, and the processor is configured to execute the method according to any one of claims 1 to 6 through the computer program.

10. A computer program product, comprising a computer program, characterized in that The computer program is used by a processor to execute the steps of the method described in any one of claims 1 to 6.

Images