A wind turbine tower design method

Abstract

The present invention discloses a method for designing a tower of a wind turbine generator set, comprising the following steps: obtaining the initial preset parameters of the tower, wherein the initial preset parameters include: the diameter of the upper end of the tower, the diameter of the lower end of the tower and the height of each pipe section; based on the initial parameters, combined with the design parameters of the wind turbine and the estimated load at the top and the estimated load at the bottom of the tower, interpolating and calculating the design parameters of the pipe section, wherein the design parameters of the pipe section include: diameter and wall thickness. In addition, an engineering algorithm is used to calculate the first-order natural frequency of the tower using the obtained pipe section diameter, wall thickness parameters and wind turbine parameters, and an evaluation is performed. The above-mentioned evaluation process realizes synchronous real-time calculation through the interpolation method, and after each parameter is reviewed, a better design scheme can be obtained for detailed calculation and verification, so that the tower calculation and verification process can be completed at one time, which simplifies the design process and improves the design efficiency of the wind turbine generator set tower.

Description

Technical Field

[0001] The invention relates to the field of wind power generation equipment manufacturing, and in particular to a wind power generator tower design method. Background Art

[0002] Different wind farms have different heights for wind turbines according to wind shear conditions. To ensure that wind farms obtain the highest returns, towers usually need to be customized, and economical tower design solutions need to be quickly introduced to meet project requirements. At the same time, the wind turbine tower structure is simple and regular, and is divided into multiple sections in the height direction. Each section is a cylindrical or conical structure, and the sections are connected by flanges. Due to hoisting and transportation issues, there are restrictions on the length, maximum diameter and weight of a single tower section, which requires multiple evaluations during the design, resulting in repeated designs.

[0003] At present, the tower design in the industry is usually modeled using drawing software, relying on experience to set the length of each section of the tower, the upper and lower end diameters, the height of each pipe segment, and the wall thickness, submit the load calculation, output the cross-sectional load of each pipe segment and then conduct a check. Then, based on the check results, the upper and lower diameters of the tower, the lengths of each segment, the height of each pipe segment, and the wall thickness are readjusted, and the cross-sectional load is output again for verification. This process is repeated until the ideal tower design is obtained.

[0004] Using drawing software to model the tower based on experience, adjusting the length of each tower section, the upper and lower end diameters, and the height of the pipe section is inefficient, and it is impossible to evaluate the tower natural frequency and the weight of a single tower section in advance. After completing the load calculation, strength verification, and scheme optimization based on the initial model, the tower natural frequency may not meet the unit's safe operation requirements, and the weight of a single tower section may exceed the lifting limit. It is necessary to readjust the diameter of each tower section, the length of each segment, re-model, and re-check the optimization. This design method requires repeated modeling, calculation, and verification to obtain a better tower design solution. Summary of the invention

[0005] The purpose of the embodiment of the present invention is to provide a method for designing a tower of a wind turbine generator set. By obtaining key data such as the length, taper and weight of each pipe segment, an engineering algorithm is used to perform a preliminary evaluation of the natural frequency of the tower, and based on the estimated tower top and tower bottom loads, an interpolation method is used to obtain the specific loads of each pipe segment cross section of the tower, and the strength of the pipe segment cross section is evaluated. A better design scheme is obtained by review for detailed calculation and verification, so that the calculation and verification process that originally required multiple repetitions can be completed at one time, thereby simplifying the design process, shortening the tower design time, and greatly improving the design efficiency of the wind turbine generator set tower.

[0006] In order to solve the above technical problems, an embodiment of the present invention provides a wind turbine tower design method, comprising the following steps:

[0007] Acquire initial preset parameters of the tower, wherein the initial preset parameters include: the diameter of the upper end of the tower, the diameter of the lower end of the tower and the height of each pipe section;

[0008] According to the initial parameters, combined with the fan design parameters and the estimated load at the top and the estimated load at the bottom of the tower, the design parameters of the pipe segment are interpolated and calculated, wherein the design parameters of the pipe segment include: diameter and wall thickness.

[0009] Further, the diameter of the pipe section includes: the outer diameter of the lower section;

[0010] The lower cross-section outer diameter Da i for:

[0011]

[0012] L=∑L i =L 1 +L 2 +…+L n ,

[0013] Do i =Da i -2t i ,

[0014] Among them, Da 0 is the outer diameter of the tower top, Da n is the outer diameter of the tower bottom, L i is the height of the pipe section, L is the length of the tower section, t i is the wall thickness of the pipe segment, and i is the serial number of the pipe segment.

[0015] Furthermore, after the interpolation calculation of the design parameters of the pipe segment, the method further includes:

[0016] Calculating the first-order natural frequency of the tower according to the design parameters of each of the pipe segments;

[0017] Judging whether the tower meets the unit operation safety requirements according to the first-order natural frequency;

[0018] If the requirements are met, it is determined that the design parameters of each pipe joint meet the requirements;

[0019] If not met, the initial preset parameters of the tower are adjusted.

[0020] Furthermore, the first-order natural frequency f of the tower is:

[0021]

[0022]

[0023]

[0024] Do i =Da i -2t i ,

[0025] Wherein, E is the elastic modulus of the tower material, m 1 is the weight of the fan, m 2i Weight of each tube section of the tower, t i is the wall thickness of the pipe segment, Da i is the outer diameter of the lower section of the pipe joint, Do i is the inner diameter of the lower section of the pipe segment.

[0026] Furthermore, after the interpolation calculation of the design parameters of the pipe segment, the method further includes:

[0027] The cross-sectional load of each pipe segment is calculated based on the estimated load at the top and the estimated load at the bottom of the tower and the design parameters of each pipe segment.

[0028] Further, the pipe segment cross-sectional load includes: cross-sectional bending moment of the pipe segment;

[0029] The section bending moment Mxy i for:

[0030]

[0031] F i =Fz i-1 +m 2i G,

[0032] F 0 =m 1 G,

[0033]

[0034]

[0035] Among them, m 1 is the weight of the fan, m 2i is the weight of each pipe section of the tower, ρ is the material density of the tower, Mxy 0 is the bending moment at the top of the tower, Mxy n is the tower bottom bending moment, Fz i is the cross-sectional pressure at the lower part of the tower tube section.

[0036] Furthermore, after the interpolation calculation of the design parameters of the pipe segment, the method further includes:

[0037] Determine whether the design parameters of each pipe section meet the production standards and transportation standards;

[0038] If the design parameters of each pipe segment meet the production standard and transportation standard, the initial preset parameters of the tower are imported into the tower design model;

[0039] If the design parameters of each pipe segment do not meet the production standard and transportation standard, the value of the initial preset parameter of the tower is adjusted, and the design parameters of each pipe segment are recalculated.

[0040] Furthermore, after the interpolation calculation of the design parameters of the pipe segment, the method further includes:

[0041] The tower design model is reviewed by load simulation software, and the wall thickness of each pipe segment is adjusted according to the review result to obtain the reviewed design parameters of the tower.

[0042] Furthermore, the load simulation software may be Blade, Fast or LMS SWT.

[0043] Furthermore, the tower is a thin-walled structure, and its cross section is circular or regular polygonal.

[0044] The above technical solution of the embodiment of the present invention has the following beneficial technical effects:

[0045] By obtaining key data such as the length, taper and weight of each pipe segment, an engineering algorithm is used to conduct a preliminary assessment of the tower's natural frequency. Based on the estimated tower top and bottom loads, the interpolation method is used to obtain the specific loads on the cross-section of each pipe segment of the tower, and the strength of the pipe segment cross-section is evaluated. The optimal design scheme is reviewed and used for detailed calculation and verification, so that the calculation and verification process that originally required multiple repetitions can be completed in one go, simplifying the design process, shortening the tower design time, and greatly improving the design efficiency of the wind turbine tower. BRIEF DESCRIPTION OF THE DRAWINGS

[0046] Figure 1 is a flow chart of a wind turbine tower design method provided by an embodiment of the present invention;

[0047] Figure 2 It is a logic diagram of a wind turbine tower design method provided by an embodiment of the present invention;

[0048] Figure 3 is a schematic diagram of the height of a tower tube section provided by an embodiment of the present invention;

[0049] Figure 4 It is a schematic diagram of a pipe segment height calculation method provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0050] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with specific embodiments and with reference to the accompanying drawings. It should be understood that these descriptions are only exemplary and are not intended to limit the scope of the present invention. In addition, in the following description, the description of well-known structures and technologies is omitted to avoid unnecessary confusion of the concept of the present invention.

[0051] Figure 1 It is a flow chart of a wind turbine tower design method provided by an embodiment of the present invention.

[0052] Figure 2 It is a logic diagram of a wind turbine tower design method provided by an embodiment of the present invention.

[0053] Please refer to Figure 1 and Figure 2 The embodiment of the present invention provides a wind turbine tower design method, comprising the following steps:

[0054] S100, obtaining initial preset parameters of the tower, wherein the initial preset parameters include: a tower upper end diameter, a tower lower end diameter, and a height of each pipe section.

[0055] S200, interpolating and calculating design parameters of the pipe segment based on the initial parameters, combined with the wind turbine design parameters and the estimated load at the top and bottom of the tower, wherein the design parameters of the pipe segment include: diameter and wall thickness.

[0056] The above technical solution combines the fan design parameters with the estimated loads at the top and bottom of the tower, calculates the dominant load of each pipe section according to the design parameters of each pipe section, evaluates the strength of the pipe section so that its safety factor meets the design requirements, and obtains a better pipe wall thickness solution; at the same time, an engineering algorithm is used to calculate the first-order natural frequency of the tower using the obtained pipe diameter, wall thickness parameters and fan parameters, and evaluates it.

[0057] Figure 3 It is a schematic diagram of the tower tube section height provided by an embodiment of the present invention.

[0058] Figure 4 It is a schematic diagram of a pipe segment height calculation method provided in an embodiment of the present invention.

[0059] Please refer to Figure 3 and Figure 4 , the diameter of the pipe section includes: the outer diameter of the lower section.

[0060] Specifically, the lower section outer diameter Da i for:

[0061]

[0062] L=∑Li =L 1 +L 2 +…+L n ,

[0063] Do i =Da i -2t i ,

[0064] Among them, Da 0 is the outer diameter of the tower top, Da n is the outer diameter of the tower bottom, L i is the height of the pipe section, L is the length of the tower section, t i is the wall thickness of the pipe segment, and i is the serial number of the pipe segment.

[0065] Take a circular cross-section tower with the outer walls of the upper and lower pipe segments aligned as an example. The top diameter of the tower is known to be Da. 0 And the tower bottom diameter Da n， Enter or adjust the height L of each pipe section i , the outer diameter Da of each pipe section can be obtained in real time i .

[0066] In addition, if the tower adopts a design in which the middle of the upper and lower pipe sections are aligned, it is also applicable to this technical solution.

[0067] After the interpolation calculation of the design parameters of the pipe segment, it also includes:

[0068] S310, calculating the first-order natural frequency of the tower according to the design parameters of each pipe segment.

[0069] S320, judging whether the tower meets the unit operation safety requirements based on the first-order natural frequency.

[0070] S330, if it meets the requirements, it is determined that the design parameters of each pipe section meet the requirements.

[0071] S340, if not met, adjust the initial preset parameters of the tower.

[0072] By obtaining the key data of each tube section of the tower, combined with the design parameters of the wind turbine and the estimated loads at the top and bottom of the tower, the interpolation method is used to obtain the dominant loads of each tube section of the tower, and the strength of the tube section is evaluated to make its safety factor meet the design requirements and obtain a better tube section wall thickness solution; at the same time, the engineering algorithm is used to use the obtained tube section diameter, wall thickness parameters and wind turbine parameters to calculate the first-order natural frequency of the tower and conduct an evaluation. The above evaluation process is realized by synchronous real-time calculation through the interpolation method. After the various parameters are reviewed, a better design solution can be obtained for detailed calculation and verification, so that the tower calculation and verification process can be completed at one time, simplifying the design process, shortening the tower design time, and greatly improving the design efficiency of the wind turbine tower.

[0073] Specifically, the first-order natural frequency f of the tower is:

[0074]

[0075] I=∑I i ,

[0076]

[0077] Do i =Da i -2t i ,

[0078] Where E is the elastic modulus of the tower material, m 1 is the weight of the fan, m 2i Weight of each tube section of the tower, t i is the wall thickness of the pipe segment, Da i is the outer diameter of the lower section of the pipe joint, Do i It is the inner diameter of the lower section of the pipe joint.

[0079] After determining the top and bottom diameters of the tower through the above formula, combined with the wind turbine design parameters and the estimated top and bottom loads of the tower, while adjusting the tower tube section height and wall thickness, the parameters to be evaluated, such as tower weight, tower height, natural frequency, strength safety factor, etc., are adjusted in real time. Once all the parameters to be evaluated meet the design requirements, the design parameters of the tower can be obtained, that is, a tower model with high accuracy.

[0080] Optionally, after the interpolation calculation of the design parameters of the pipe segment, the following is also included:

[0081] S410, combining the estimated load at the top of the tower and the estimated load at the bottom of the tower, and calculating the cross-sectional load of each pipe segment according to the design parameters of each pipe segment.

[0082] Specifically, the pipe segment cross-sectional load includes: a cross-sectional bending moment of the pipe segment.

[0083] Section bending moment Mxy i for:

[0084]

[0085] F i =Fz i-1 +m 2i G,

[0086] F 0 =m 1 G,

[0087]

[0088] m 2 =Σm 2i ,

[0089] Among them, m 1 is the weight of the fan, m 2i is the weight of each tower tube section, ρ is the tower material density, Mxy 0 is the bending moment at the top of the tower, Mxy n is the bending moment at the bottom of the tower, Fz i is the cross-sectional pressure at the lower part of the tower tube section.

[0090] Given the bending moment Mxy at the top of the tower 0 And the tower bottom bending moment Mxy n , input or adjust the height L of each pipe section i , the section bending moment Mxy of each pipe segment can be obtained in real time i .

[0091] Optionally, after the interpolation calculation of the design parameters of the pipe segment, the following is also included:

[0092] S510, determining whether the design parameters of each pipe segment meet the production standard and transportation standard.

[0093] S520: If the design parameters of each pipe segment meet the production standard and the transportation standard, the initial preset parameters of the tower are imported into the tower design model.

[0094] S530: If the design parameters of each pipe segment do not meet the production standard and the transportation standard, the value of the initial preset parameter of the tower is adjusted, and the design parameters of each pipe segment are recalculated.

[0095] Optionally, after the interpolation calculation of the design parameters of the pipe segment, the following is also included:

[0096] S610, review the tower design model through load simulation software, and adjust the wall thickness of each pipe segment according to the review result to obtain the tower review design parameters.

[0097] Optionally, the load simulation software may be Blade, Fast or LMS SWT.

[0098] By using the interpolation method to estimate the load, the design parameters of each pipe segment are associated with the load to quickly obtain the section safety factor and obtain a more feasible and optimal solution.

[0099] The above tower design method obtains the key data of each pipe section of the tower, obtains the specific load of each pipe section of the tower according to the estimated tower top and tower bottom loads, and uses the interpolation method to evaluate the strength of the pipe section. The better design scheme is obtained through verification for detailed calculation and verification, so that the calculation and verification process can be completed in one go, which simplifies the design process, shortens the tower design time, and greatly improves the design efficiency of the wind turbine tower.

[0100] In the above technical solution, the tower can be a thin-walled structure, and its cross section is circular or regular polygonal. Specifically, the wind power steel tower is usually circular, and the wind power concrete tower is a regular polygon or circular.

[0101] The technical solution of the present invention adopts the interpolation method to realize the mutual correlation and real-time adjustment of the tower design input parameters and the parameters to be evaluated, so as to quickly evaluate the tower preliminary design plan.

[0102] The embodiment of the present invention aims to protect a method for designing a tower of a wind turbine generator set, comprising the following steps: obtaining initial preset parameters of the tower, wherein the initial preset parameters include: the diameter of the upper end of the tower, the diameter of the lower end of the tower and the height of each pipe section; based on the initial parameters, combined with the wind turbine design parameters and the estimated load at the top and the estimated load at the bottom of the tower, interpolating and calculating the design parameters of the pipe section, wherein the design parameters of the pipe section include: diameter and wall thickness. The above technical solution has the following effects:

[0103] By obtaining key data such as the length, taper and weight of each pipe segment, an engineering algorithm is used to conduct a preliminary assessment of the tower's natural frequency. Based on the estimated tower top and bottom loads, the interpolation method is used to obtain the specific loads on the cross-section of each pipe segment of the tower, and the strength of the pipe segment cross-section is evaluated. The optimal design scheme is reviewed and used for detailed calculation and verification, so that the calculation and verification process that originally required multiple repetitions can be completed in one go, simplifying the design process, shortening the tower design time, and greatly improving the design efficiency of the wind turbine tower.

[0104] It should be understood that the above specific embodiments of the present invention are only used to illustrate or explain the principles of the present invention, and do not constitute a limitation of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention should be included in the protection scope of the present invention. In addition, the appended claims of the present invention are intended to cover all changes and modifications that fall within the scope and boundaries of the appended claims, or the equivalent forms of such scope and boundaries.

Claims

1. A wind turbine tower design method, characterized in that: The tower comprises a plurality of pipe sections, and includes the following steps: Acquire initial preset parameters of the tower, wherein the initial preset parameters include: the diameter of the upper end of the tower, the diameter of the lower end of the tower and the height of each pipe section; According to the initial preset parameters, combined with the fan design parameters and the estimated load at the top and the estimated load at the bottom of the tower, the design parameters of the pipe segment are calculated, wherein the design parameters of the pipe segment include: diameter and wall thickness; After calculating the design parameters of the pipe joint, the method further includes: Calculating the first-order natural frequency of the tower according to the design parameters of each pipe segment; Judging whether the tower meets the unit operation safety requirements according to the first-order natural frequency; If the requirements are met, it is determined that the design parameters of each pipe joint meet the requirements; If not, adjusting the initial preset parameters of the tower; After calculating the design parameters of the pipe joint, the method further includes: Reviewing the tower design model through load simulation software, and adjusting the wall thickness of each pipe segment according to the review result to obtain the reviewed design parameters of the tower; The first-order natural frequency f of the tower is: I=∑I i , From i =From i -2t i , Where E is the elastic modulus of the tower material, m1 is the weight of the wind turbine, and m 2i is the weight of each tube section of the tower, t i is the wall thickness of the pipe segment, Da i is the outer diameter of the lower section of the pipe segment, Do i is the inner diameter of the lower cross section of the pipe segment; The diameter of the pipe section includes: the outer diameter of the lower section; The lower cross-section outer diameter Da i for: L=∑L i =L1+L2+…+L n , From i =From i -2t i , Wherein, Da0 is the outer diameter of the tower top, Da n is the outer diameter of the tower bottom, L i is the height of the pipe section, L is the length of the tower section, t i is the wall thickness of the pipe segment, and i is the serial number of the pipe segment; After calculating the design parameters of the pipe joint, the method further includes: In combination with the estimated load at the top of the tower and the estimated load at the bottom of the tower, according to the design parameters of each pipe segment, the cross-sectional load of each pipe segment is calculated; The pipe segment cross-sectional load includes: cross-sectional bending moment of the pipe segment; The section bending moment Mxy i for: Fz i =Fz i-1 +m 2i ·G, Fz0=m1·G, <h2 style=";text-align:left;direction:ltr">m2 = ∑m<h2 style=";text-align:left;direction:ltr"> 2i <h2 style=";text-align:left;direction:ltr"> , Wherein, m1 is the weight of the fan, m 2i is the weight of each pipe section of the tower, ρ is the material density of the tower, Mxy0 is the bending moment at the top of the tower, Mxy n is the tower bottom bending moment, Fz i is the cross-sectional pressure at the lower part of the tower tube section.

2. The wind turbine tower design method according to claim 1, characterized in that: After calculating the design parameters of the pipe joint, the method further includes: Determine whether the design parameters of each pipe section meet the production standards and transportation standards; If the design parameters of each pipe segment meet the production standard and transportation standard, the initial preset parameters of the tower are imported into the tower design model; If the design parameters of each pipe segment do not meet the production standard and transportation standard, the value of the initial preset parameter of the tower is adjusted, and the design parameters of each pipe segment are recalculated.

3. The wind turbine tower design method according to claim 1, characterized in that: The load simulation software may be Blade, Fast or LMS SWT.

4. The wind turbine tower design method according to any one of claims 1 to 3, characterized in that: The tower is a thin-walled structure, and its cross section is a circle or a regular polygon.

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