Safety verification methods and devices for wind farm towers, blades and wind turbines

Abstract

This invention relates to a method and apparatus for safety verification of wind farm towers, blades, and wind turbines, belonging to the field of wind power control technology. The method involves: obtaining the maximum turbulence intensity and maximum external conditions under different material properties; selecting, under the envelope turbulence intensity and maximum external conditions corresponding to the respective material properties, operating conditions more sensitive to tower and blade load calculations according to IEC standards are used to perform ultimate and fatigue load calculations on the tower and blades, omitting calculations for operating conditions where the load calculations on the blades and towers have little impact; post-processing the ultimate and fatigue load calculation results for the blades and towers respectively, and comparing the processed results with the corresponding design loads to achieve wind turbine safety verification. The apparatus includes a processor and a memory, the processor executing computer instructions stored in the memory for implementing the above method. This invention reduces the number of operating conditions for load calculations during wind turbine safety verification, improving the timeliness of the verification.

Description

Technical Field

[0001] This invention belongs to the field of wind power control technology, specifically relating to a method and device for safety verification of wind farm towers, blades and wind turbines. Background Technology

[0002] When verifying the safety of large wind turbine towers and blades, load calculations are required for various operating conditions specified in the IEC standard. The IEC standard sets numerous operating conditions for wind farm safety verification, with some conditions being more sensitive to the dominant loads on the towers and blades. Therefore, after analyzing wind resources and conditions, selecting appropriate operating conditions for each component and conducting a safety review of the wind farm is crucial. Currently, with the wind resource data obtained from software, load calculations are directly performed using various factors such as turbulence intensity, annual average wind speed, and air density, in conjunction with the IEC standard. However, the IEC standard often requires a wide variety of operating conditions for load calculations, most of which have no impact on component loads, making the calculations excessively complex and severely affecting the timeliness of turbine load calculations. Summary of the Invention

[0003] The purpose of this invention is to provide a method and apparatus for safety verification of wind farm towers, blades and wind turbines, so as to solve the problems of heavy calculation and low timeliness of existing safety verification methods for wind farm towers, blades and wind turbines.

[0004] The present invention provides a technical solution for a wind farm blade safety verification method to address the problems of cumbersome calculations and low timeliness in existing wind farm blade safety verification methods. The method includes:

[0005] 1) Obtain the turbulence intensity values ​​of the wind turbine at different wind speeds at various turbine locations under different material properties, obtain the maximum turbulence intensity of the wind turbine under different material properties based on the turbulence intensity values, and determine the maximum external conditions of the wind turbine based on the external conditions of each turbine location.

[0006] 2) Under the envelope turbulence intensity and maximum external conditions corresponding to the first selected material property, select the fault conditions and conditions dlc1.3, dlc1.4, dlc1.5, and dlc2.2 specified in the IEC / GL standard, and the blade ultimate load calculations for conditions dlc3.2, dlc4.2, and dlc6.2. Blade ultimate load calculations are not performed for other conditions specified in the IEC / GL standard.

[0007] 3) Under the envelope turbulence intensity and maximum external conditions corresponding to the second selected material properties, select the operating conditions dlc1.2, dlc3.1, dlc4.1 and dlc6.4 specified in the IEC / GL standard to carry out blade fatigue load calculations. Blade fatigue load calculations are not carried out for other operating conditions specified in the IEC / GL standard.

[0008] 4) For the blade ultimate load calculation results obtained in step 2), post-process the ultimate load of each section of the blade and the bolt, compare the post-processed results with the first design load, and perform a safety check on the blade ultimate load.

[0009] 5) Based on the blade fatigue load calculation results obtained in step 3), post-process the fatigue load of each section of the blade and the bolts, compare the post-processed results with the third design load, and perform a safety check on the blade fatigue load.

[0010] The beneficial effects of this invention are: it reduces the number of working conditions for load calculation during the safety verification process of wind farm blades, thereby improving the timeliness of the verification.

[0011] Furthermore, to improve the accuracy of the safety verification, in step 1), the material properties are characterized by the Wöhler index of the material, and three different material properties are selected, with Wöhler indices of 1, 4, and 10 respectively; in step 2), the first selected material property refers to a material with a Wöhler index of 1; in step 3), the second selected material property refers to a material with a Wöhler index of 4 or 10.

[0012] The technical solution provided by this invention for wind farm tower safety verification, which addresses the problems of cumbersome calculations and low timeliness in existing methods, is as follows:

[0013] 1) Obtain the turbulence intensity values ​​of the wind turbine at different wind speeds at various turbine locations under different material properties, obtain the maximum turbulence intensity of the wind turbine under different material properties based on the turbulence intensity values, and determine the maximum external conditions of the wind turbine based on the external conditions of each turbine location.

[0014] 2) Under the envelope turbulence intensity and maximum external conditions corresponding to the first selected material property, the tower ultimate load calculation is carried out using the operating conditions dlc1.3, dlc1.4, dlc2.3, dlc3.2, dlc4.2 and dlc6.2 specified in the IEC / GL standard. The tower ultimate load calculation is not carried out for other operating conditions specified in the IEC / GL standard.

[0015] 3) Under the envelope turbulence intensity and maximum external conditions corresponding to the second selected material properties, select the operating conditions dlc1.2, dlc3.1, dlc4.1 and dlc6.4 specified in the IEC / GL standard to carry out tower fatigue load calculations. Tower fatigue load calculations are not carried out for other operating conditions specified in the IEC / GL standard.

[0016] 4) Based on the tower ultimate load calculation results obtained in step 2), post-process the ultimate load of each section of the tower, compare the post-processed results with the second design load, and perform safety verification on the tower ultimate load.

[0017] 5) Based on the tower fatigue load calculation results obtained in step 3), perform fatigue load post-processing on each section of the tower, compare the post-processing results with the fourth design load, and perform safety verification on the tower fatigue load.

[0018] The beneficial effects of this invention are: it reduces the number of load calculation conditions in the safety verification process of wind farm towers, thereby improving the timeliness of the verification.

[0019] Furthermore, to improve the accuracy of the safety verification, in step 1), the material properties are characterized by the Wöhler index of the material, and three different material properties are selected, with Wöhler indices of 1, 4, and 10 respectively; in step 2), the first selected material property refers to a material with a Wöhler index of 1; in step 3), the second selected material property refers to a material with a Wöhler index of 4 or 10.

[0020] The technical solution provided by this invention for the safety verification method of wind turbines in wind farms, which addresses the problems of cumbersome calculations and low timeliness in existing methods, is as follows:

[0021] 1) Obtain the turbulence intensity values ​​of the wind turbine at different wind speeds at various turbine locations under different material properties, obtain the maximum turbulence intensity of the wind turbine under different material properties based on the turbulence intensity values, and determine the maximum external conditions of the wind turbine based on the external conditions of each turbine location.

[0022] 2) Under the envelope turbulence intensity and maximum external conditions corresponding to the first selected material property, perform blade ultimate load calculations for the fault conditions in operating conditions dlc1.3, dlc1.4, dlc1.5, and dlc2.2 and operating conditions dlc3.2, dlc4.2, and dlc6.2 specified in the IEC / GL standard. Blade ultimate load calculations are not performed for other operating conditions specified in the IEC / GL standard.

[0023] 3) Under the envelope turbulence intensity and maximum external conditions corresponding to the first selected material property, select the operating conditions dlc1.2, dlc3.1, dlc4.1 and dlc6.4 specified in the IEC / GL standard to carry out tower fatigue load calculation. Tower fatigue load calculation is not carried out for other operating conditions specified in the IEC / GL standard.

[0024] 4) Under the envelope turbulence intensity and maximum external conditions corresponding to the second selected material properties, select the operating conditions dlc1.2, dlc3.1, dlc4.1 and dlc6.4 specified in the IEC / GL standard to carry out blade fatigue load calculation and tower fatigue load calculation respectively. Other operating conditions specified in the IEC / GL standard do not carry out blade and tower fatigue load calculation.

[0025] 5) For the blade ultimate load calculation results obtained in step 2), post-process the ultimate load of each section of the blade and the bolt, compare the post-processed results with the first design load, and perform a safety check on the blade ultimate load.

[0026] 6) Based on the tower ultimate load calculation results obtained in step 3), post-process the ultimate load of each section of the tower, compare the post-processed results with the second design load, and perform safety verification on the tower ultimate load.

[0027] 7) Based on the blade fatigue load calculation results obtained in step 4), post-process the fatigue load of each section of the blade and the bolts, compare the post-processed results with the third design load, and perform a safety check on the blade fatigue load.

[0028] 8) Based on the tower fatigue load calculation results obtained in step 4), perform fatigue load post-processing on each section of the tower, compare the post-processing results with the fourth design load, and perform safety verification on the tower fatigue load.

[0029] The beneficial effects of this invention are: it reduces the number of operating conditions for load calculation during the safety verification process of wind turbine units in wind farms, thereby improving the timeliness of the verification.

[0030] Furthermore, to improve the accuracy of safety verification, in step 1), the material properties are characterized by the Wöhler index of the material, and three different material properties are selected, with Wöhler indices of 1, 4, and 10 respectively; in steps 2) and 3), the first selected material property refers to a material with a Wöhler index of 1; in step 4), the second selected material property refers to a material with a Wöhler index of 4 and 10.

[0031] The technical solution provided by this invention for a wind farm blade safety verification device to solve the problems of cumbersome calculations and low timeliness in existing wind farm blade safety verification is as follows: The device includes a processor and a memory. The processor is used to execute computer instructions stored in the memory, and the computer instructions are used to implement the above-mentioned wind farm blade safety verification method.

[0032] The beneficial effects of this invention are: it reduces the number of working conditions for load calculation during the safety verification process of wind farm blades, thereby improving the timeliness of the verification.

[0033] The technical solution provided by this invention for a wind farm tower safety verification device to solve the problems of cumbersome calculations and low timeliness in existing wind farm tower safety verification is as follows: The device includes a processor and a memory. The processor is used to execute computer instructions stored in the memory, and the computer instructions are used to implement the above-mentioned wind farm tower safety verification method.

[0034] The beneficial effects of this invention are: it reduces the number of load calculation conditions in the safety verification process of wind farm towers, thereby improving the timeliness of the verification.

[0035] The technical solution provided by this invention for a wind farm wind turbine safety verification device to solve the problems of cumbersome calculations and low timeliness in existing wind farm wind turbine safety verification is as follows: The device includes a processor and a memory. The processor is used to execute computer instructions stored in the memory, and the computer instructions are used to implement the above-mentioned wind farm wind turbine safety verification method.

[0036] The beneficial effects of this invention are: it reduces the number of operating conditions for load calculation during the safety verification process of wind turbine units in wind farms, thereby improving the timeliness of the verification. Attached Figure Description

[0037] Figure 1 This is a flowchart of the safety verification method for wind turbine generators in a wind farm according to an embodiment of the present invention;

[0038] Figure 2 This is a flowchart of a method for verifying the safety of wind farm blades according to an embodiment of the present invention;

[0039] Figure 3 This is a flowchart illustrating the safety verification method for wind farm towers according to an embodiment of the present invention. Detailed Implementation

[0040] The specific embodiments of the present invention will be further described below with reference to the accompanying drawings.

[0041] The technical concept of this invention lies in the following: When performing safety verification on wind farm towers and blades, or wind turbine generator sets containing towers and blades, this invention, based on the wind resource conditions of the wind farm, no longer performs load calculations for operating conditions that have little impact on the ultimate load calculation and fatigue load calculation of the towers and blades, but only performs load calculations for operating conditions that are more sensitive to the load calculation of the towers and blades. This reduces workload and improves timeliness while ensuring the safety verification is achieved.

[0042] Embodiments of the wind farm wind turbine safety verification method of the present invention

[0043] The main steps in the existing technology for safety verification of wind farm towers and blades are as follows:

[0044] 1) Based on the external conditions of wind resources output by the software, the turbulence intensity values ​​under three different wind speeds (m=1, m=4, m=10) are obtained; where m=1, m=4, and m=10 are the Wohler exponents of different materials.

[0045] 2) Using the maximum turbulence intensity at each wind speed and location for each turbine in category m=1, combined with the IEC / GL standard, calculate the ultimate load verification of the wind turbine tower and blades. The operating conditions that need to be verified are: dlc1.3, dlc1.4, dlc1.5, dlc2.1, dlc2.2, dlc2.3, dlc2.5, dlc3.2, dlc4.2, dlc5.1, dlc6.1, dlc6.2, dlc6.3, dlc7.1, dlc8.1 and dlc8.2 in the IEC / GL standard.

[0046] 3) Using the maximum turbulence intensity at each wind speed for each turbine location in categories m=4 and m=10, and in conjunction with the IEC / GL standard, calculate the fatigue load on the wind turbine tower and blades respectively. The operating conditions that need to be checked are: dlc1.2, dlc3.1, dlc4.1, dlc2.4 and dlc6.4 in the IEC / GL standard.

[0047] 4) If the load calculation results are within the design load range of the wind turbine tower and blades, then there are no safety hazards in the tower and blades of the wind farm; if the load calculation results exceed the design load of the wind turbine tower and blades, then there are significant safety hazards in the wind farm, and protective measures need to be taken during the operation of the units or the wind turbine units should not be put into operation at the location.

[0048] However, after analyzing various operating conditions of wind turbine towers and blades based on wind resources in wind farms, the inventors found that: in the calculation conditions set and output by Bladed software, operating conditions dlc2.1, dlc2.3, dlc2.5, dlc5.1, dlc6.1, and dlc6.3 in the IEC / GL standard have little impact on the calculation of blade ultimate load; for the calculation of tower ultimate load, operating conditions dlc2.1, dlc2.2, dlc2.5, dlc5.1, dlc6.1, and dlc6.3 in the IEC / GL standard have little impact. For the fatigue load calculation of blades and towers, the dlc2.4 operating condition in the IEC / GL standard accounts for a small proportion of the time and has a relatively small impact on the fatigue load of blades and towers.

[0049] Based on the above research results, this invention proposes a new method for safety verification of wind turbine generators in wind farms, such as... Figure 1 As shown, the method includes the following steps:

[0050] 1) Obtain the turbulence intensity values ​​of each turbine location of the wind turbine under different wind speeds with different material properties. Based on the turbulence intensity values, obtain the maximum turbulence intensity of the wind turbine under the Wohler index of different materials, i.e., the envelope turbulence intensity. Obtain the external conditions of each turbine location of the wind turbine under different material properties, and select the maximum external conditions of the wind turbine under different material properties.

[0051] The specific process of obtaining the maximum turbulence intensity of the wind turbine under different material properties based on the turbulence intensity value is existing technology. For details, please refer to Chinese invention patent application No. CN113947037A, "A method and device for calculating the load of a wind turbine", which will not be described in detail here.

[0052] 2) When checking the ultimate load of the blade, under the envelope turbulence intensity and maximum external conditions of the wind turbine under the first selected material properties, the ultimate load calculation is carried out in the fault condition and the operating condition in IEC / GL standard dlc1.3, dlc1.4, dlc1.5, dlc2.2. Other operating conditions have no effect on the dominant loads in all directions of the blade, and the ultimate load calculation is not carried out in other operating conditions.

[0053] 3) When performing ultimate load verification on the tower, under the envelope turbulence intensity and maximum external conditions of the wind turbine under the first selected material properties, the ultimate load calculation is carried out using the operating conditions dlc1.3, dlc1.4, dlc2.3, dlc3.2, dlc4.2 and dlc6.2 in the IEC / GL standard. Other operating conditions have no effect on the dominant loads in each direction of the tower, so ultimate load calculation is not carried out.

[0054] 4) When checking the fatigue load for the tower and blades, under the envelope turbulence intensity and maximum external conditions of the wind turbine under the second selected material properties, select the operating conditions dlc1.2, dlc3.1, dlc4.1 and dlc6.4 in the IEC / GL standard to carry out fatigue load calculations. Do not carry out load calculations for other operating conditions.

[0055] According to the Weibull wind frequency distribution and equivalent fatigue load calculation, there are time regulations and requirements for each fatigue condition. The fatigue load of the DLC2.4 condition is not high, the failure condition occurs less frequently, and the impact on fatigue load in all directions is small. Therefore, fatigue load calculation is not carried out.

[0056] 5) For the ultimate load calculation results under each working condition in step 2), post-process the ultimate load of each section of the blade and the bolt, compare the post-processed results with the first design load, and conduct a safety assessment of the ultimate load of the blade.

[0057] 6) Based on the calculation results of the ultimate load under each working condition in step 3), post-process the ultimate load of each section of the tower, compare the post-processed results with the second design load, and conduct a safety assessment of the ultimate load of the tower.

[0058] 7) Based on the fatigue load calculation results under each working condition in step 4), post-process the fatigue load of each section of the blade and the bolts, compare the post-processed results with the third design load, and conduct a safety assessment of the blade fatigue load.

[0059] 8) Based on the fatigue load calculation results under each working condition in step 5), perform fatigue load post-processing on each section of the tower, compare the post-processing results with the fourth design load, and conduct a safety assessment of the tower fatigue load.

[0060] In another implementation, in step 1), the material properties are characterized by the Wöhler index of the material. Three different material properties are selected, and the Wöhler indices of the materials are 1, 4, and 10 (m = 1, m = 4, m = 10); in steps 2) and 3), the first selected material property refers to the material with a Wöhler index of 1; in step 4), the second selected material property refers to the material with a Wöhler index of 4 and 10.

[0061] The post-processing procedures in steps 5) to 8) above are existing technologies. The IEC / GL standard has detailed provisions on post-processing procedures, which will not be described in detail here.

[0062] As the optimal implementation method, in step 1), when obtaining the turbulence intensity values ​​at different wind speeds at various turbine locations under different material properties, the parameters at the wind turbine site can be obtained and then input into the wind resource calculation software; among which, the wind resource calculation software is preferably WT wind resource calculation software. The software used for load calculation is Bladed software. Both of these software programs are existing and mature software, and the calculation process will not be described in detail here.

[0063] Embodiments of the wind farm blade safety verification method of the present invention

[0064] like Figure 2 As shown, the wind farm blade safety verification method in this embodiment includes the following steps:

[0065] 1) Obtain the turbulence intensity values ​​of the wind turbine at different wind speeds at various turbine locations under different material properties, obtain the maximum turbulence intensity of the wind turbine based on the turbulence intensity values, and determine the maximum external conditions of the wind turbine based on the external conditions of each turbine location.

[0066] 2) Under the envelope turbulence intensity and maximum external conditions corresponding to the first selected material property, perform blade ultimate load calculations for the fault conditions in operating conditions dlc1.3, dlc1.4, dlc1.5, and dlc2.2 and operating conditions dlc3.2, dlc4.2, and dlc6.2 specified in the IEC / GL standard. Blade ultimate load calculations are not performed for other operating conditions specified in the IEC / GL standard.

[0067] 3) Under the envelope turbulence intensity and maximum external conditions corresponding to the second selected material properties, select the operating conditions dlc1.2, dlc3.1, dlc4.1 and dlc6.4 specified in the IEC / GL standard to carry out blade fatigue load calculations. Blade fatigue load calculations are not carried out for other operating conditions specified in the IEC / GL standard.

[0068] 4) For the blade ultimate load calculation results obtained in step 2), post-process the ultimate load of each section of the blade and the bolt, compare the post-processed results with the first design load, and perform a safety check on the blade ultimate load.

[0069] 5) Based on the blade fatigue load calculation results obtained in step 3), post-process the fatigue load of each section of the blade and the bolts, compare the post-processed results with the third design load, and perform a safety check on the blade fatigue load.

[0070] As another implementation, in step 1), the maximum turbulence intensity and maximum external conditions are calculated for three material properties with Wöhler exponents of 1, 4, and 10 (m = 1, m = 4, m = 10). In step 2), the first selected material property refers to the material with a Wöhler exponent of 1 (m = 1), and in step 3), the second selected material property refers to the material with a Wöhler exponent of 4 and 10 (m = 1, m = 10).

[0071] Embodiments of the wind farm tower safety verification method of the present invention

[0072] like Figure 3 As shown, the wind farm tower safety verification method of this embodiment includes the following steps:

[0073] 1) Obtain the turbulence intensity values ​​of the wind turbine at different wind speeds at various turbine locations under different material properties, obtain the maximum turbulence intensity of the wind turbine based on the turbulence intensity values, and determine the maximum external conditions of the wind turbine based on the external conditions of each turbine location.

[0074] 2) Under the envelope turbulence intensity and maximum external conditions corresponding to the first selected material property, the tower ultimate load calculation is carried out using the operating conditions dlc1.3, dlc1.4, dlc2.3, dlc3.2, dlc4.2 and dlc6.2 specified in the IEC / GL standard. The tower ultimate load calculation is not carried out for other operating conditions specified in the IEC / GL standard.

[0075] 3) Under the envelope turbulence intensity and maximum external conditions corresponding to the second selected material properties, select the operating conditions dlc1.2, dlc3.1, dlc4.1 and dlc6.4 specified in the IEC / GL standard to carry out tower fatigue load calculations. Tower fatigue load calculations are not carried out for other operating conditions specified in the IEC / GL standard.

[0076] 4) Based on the tower ultimate load calculation results obtained in step 2), post-process the ultimate load of each section of the tower, compare the post-processed results with the second design load, and perform safety verification on the tower ultimate load.

[0077] 5) Based on the tower fatigue load calculation results obtained in step 3), perform fatigue load post-processing on each section of the tower, compare the post-processing results with the fourth design load, and perform safety verification on the tower fatigue load.

[0078] As another implementation, in step 1), the maximum turbulence intensity and maximum external conditions are calculated for three material properties with Wöhler exponents of 1, 4, and 10 (m = 1, m = 4, m = 10). In step 2), the first selected material property refers to the material with a Wöhler exponent of 1 (m = 1), and in step 3), the second selected material property refers to the material with a Wöhler exponent of 4 and 10 (m = 1, m = 10).

[0079] Embodiment of the wind farm wind turbine safety verification device of the present invention

[0080] The wind farm wind turbine safety verification device of the present invention includes a processor and a memory. The processor is used to execute computer instructions stored in the memory. The computer instructions are used to implement the wind farm wind turbine safety verification method. The specific wind farm wind turbine safety verification method is described in the above-mentioned embodiment of the wind farm wind turbine safety verification method, and will not be described in detail here.

[0081] Embodiment of the wind farm blade safety verification device of the present invention

[0082] The apparatus in this embodiment includes a processor and a memory. The processor is used to execute computer instructions stored in the memory. The computer instructions are used to implement the wind farm blade safety verification method. The wind farm blade safety verification method is specifically described in the above-mentioned embodiment of the wind farm blade safety verification method, and will not be described in detail here.

[0083] Embodiment of the wind farm tower safety verification device of the present invention

[0084] The apparatus in this embodiment includes a processor and a memory. The processor is used to execute computer instructions stored in the memory. The computer instructions are used to implement the wind farm tower safety verification method. The specific wind farm tower safety verification method is described in the above-mentioned embodiment of the wind farm tower safety verification method, and will not be described in detail here.

[0085] The following example of a 5.0MW / 191 wind turbine will be used to further illustrate the technical solution of the present invention.

[0086] The external conditions for the wind turbine are: air density of 1.14 kg / m3, tower height of 110 m, cut-in wind speed of 2.6 m / s, cut-out wind speed of 20 m / s, annual average wind speed of 6 m / s, and rated wind speed of the turbine of 9 m / s.

[0087] Based on the above conditions, the safety verification method for wind farm towers and blades includes the following steps:

[0088] Step 1: Obtain turbulence intensity values ​​at different wind speeds (m=1, m=4, and m=10) using wind resource calculation software. Based on these values, fit the maximum turbulence intensity (also known as envelope turbulence intensity). Then, perform load calculations in conjunction with the unit's maximum external conditions. When m=1, the envelope turbulence intensity Iref=0.11; when m=4, Iref=0.12; when m=10, Iref=0.13. Maximum external conditions: air density is 1.14 kg / m³. 3 The average annual wind speed is 6 m / s.

[0089] Step 2: For the ultimate load check of the blade, at m=1, under the envelope turbulence intensity of Iref=0.11, the air density is 1.14 kg / m³. 3 Load calculations were performed on fault conditions (such as single blade jamming) in operating conditions dlc1.3, dlc1.4, dlc1.5, and dlc2.2, as well as operating conditions dlc3.2, dlc4.2, and dlc6.2. Other operating conditions had no effect on the dominant loads in each direction of the blade and were not included in the load calculations. The specific load calculation results are shown in Table 1.

[0090] Step 3: Check the ultimate load of the tower. At m=1, with an envelope turbulence intensity of Iref=0.11, the air density is 1.14 kg / m³. 3 Load calculations were performed using operating conditions dlc1.3, dlc1.4, dlc2.3, dlc3.2, dlc4.2, and dlc6.2. Other operating conditions had no impact on the dominant loads in each direction of the tower, and therefore no load calculations were performed. The specific load calculation results are shown in Table 2.

[0091] Step 4: Fatigue load check for the tower and blades: At m=4 and m=10, under envelope turbulence intensities of Iref=0.12 and Iref=0.13, the air density is 1.14 kg / m³. 3 When the annual average wind speed is 6 m / s, fatigue load calculations were performed on operating conditions DLC1.2, DLC3.1, DLC4.1, and DLC6.4. Load calculations were not performed on other operating conditions. The specific load calculation results are shown in Tables 3 and 4. According to the Weibull wind frequency distribution and equivalent fatigue load calculations, there are time limits and requirements for each fatigue operating condition. The fatigue load proportion of the DLC2.4 operating condition is not high, the number of failures is low, and its impact on the dominant fatigue load in each direction is small, so load calculations were not performed on it.

[0092] Step 5: Post-process the ultimate loads of each blade section and bolts based on the calculation results obtained in Step 2 for each operating condition. Compare the post-processed ultimate load results of the blade section with the design load of the blade section, and compare the post-processed ultimate load results of the blade bolts with the design load of the blade bolts. Perform a safety assessment on the ultimate loads of each blade section and bolt loads. The specific comparison results are shown in Table 1.

[0093] Step 6: Post-process the ultimate loads of each section of the tower based on the calculation results obtained from each working condition in Step 3. Compare the post-processed results with the ultimate design loads of the tower sections to conduct a safety assessment of the ultimate loads of the tower. The specific results are shown in Table 2.

[0094] Step 7: Based on the results calculated for each working condition in Step 4, and combined with the maximum annual average wind speed of the wind farm, post-process the fatigue loads of each section of the blade and the bolts. Compare the post-processed results with the design loads to conduct a safety assessment of the blade fatigue loads. The specific results are shown in Table 3.

[0095] Step 8: Based on the calculation results obtained from each working condition in Step 4, and combined with the maximum annual average wind speed of the wind farm, perform fatigue load post-processing on each section of the tower. Compare the post-processing results with the fatigue design load of the tower section to conduct a safety assessment of the tower fatigue load. The specific results are shown in Table 4.

[0096] Table 1 Comparison of ultimate dominant load and design load of blade section (m=1)

[0097]

[0098]

[0099] Table 2 Comparison of Ultimate Dominant Load and Design Load for Tower Section (m=1)

[0100]

[0101]

[0102] Table 3 Comparison of dominant fatigue load and design load on blade cross-section (m=10)

[0103]

[0104]

[0105] Table 4 Comparison of Dominant Fatigue Load and Design Load for Tower Section (m=4)

[0106]

[0107]

Claims

1. A method for verifying the safety of wind farm blades, characterized in that, The method includes the following steps: 1) Obtain the turbulence intensity values ​​of the wind turbine at different wind speeds at various turbine locations under different material properties, obtain the maximum turbulence intensity of the wind turbine under different material properties based on the turbulence intensity values, and determine the maximum external conditions of the wind turbine based on the external conditions of each turbine location. 2) Under the maximum turbulence intensity and maximum external conditions corresponding to the first selected material properties, select the fault conditions in operating conditions dlc1.3, dlc1.4, dlc1.5, and dlc2.2 and operating conditions dlc3.2, dlc4.2, and dlc6.2 specified in the IEC / GL standard to carry out the blade ultimate load calculation. Other operating conditions specified in the IEC / GL standard are not used for blade ultimate load calculation. 3) Under the maximum turbulence intensity and maximum external conditions corresponding to the second selected material properties, select the operating conditions dlc1.2, dlc3.1, dlc4.1 and dlc6.4 specified in the IEC / GL standard to carry out blade fatigue load calculations. Blade fatigue load calculations are not carried out for other operating conditions specified in the IEC / GL standard. 4) For the blade ultimate load calculation results obtained in step 2), post-process the ultimate load of each section of the blade and the bolt, compare the post-processed results with the first design load, and perform a safety check on the blade ultimate load. 5) Based on the blade fatigue load calculation results obtained in step 3), post-process the fatigue load of each section of the blade and the bolts, compare the post-processed results with the third design load, and perform a safety check on the blade fatigue load.

2. The method for verifying the safety of wind farm blades according to claim 1, characterized in that, In step 1), the material properties are characterized by the Wöhler index of the material. Three different material properties are selected, with Wöhler indices of 1, 4, and 10 respectively. In step 2), the first selected material property refers to a Wöhler index of 1. In step 3), the second selected material property refers to a Wöhler index of 4 and 10.

3. A method for verifying the safety of wind farm towers, characterized in that, The method includes the following steps: 1) Obtain the turbulence intensity values ​​of the wind turbine at different wind speeds at various turbine locations under different material properties, obtain the maximum turbulence intensity of the wind turbine under different material properties based on the turbulence intensity values, and determine the maximum external conditions of the wind turbine based on the external conditions of each turbine location. 2) Under the maximum turbulence intensity and maximum external conditions corresponding to the first selected material properties, the tower ultimate load calculation is carried out using the operating conditions dlc1.3, dlc1.4, dlc2.3, dlc3.2, dlc4.2 and dlc6.2 specified in the IEC / GL standard. The tower ultimate load calculation is not carried out for other operating conditions specified in the IEC / GL standard. 3) Under the maximum turbulence intensity and maximum external conditions corresponding to the second selected material properties, select the operating conditions dlc1.2, dlc3.1, dlc4.1 and dlc6.4 specified in the IEC / GL standard to carry out tower fatigue load calculations. Tower fatigue load calculations are not carried out for other operating conditions specified in the IEC / GL standard. 4) Based on the tower ultimate load calculation results obtained in step 2), post-process the ultimate load of each section of the tower, compare the post-processed results with the second design load, and perform safety verification on the tower ultimate load. 5) Based on the tower fatigue load calculation results obtained in step 3), perform fatigue load post-processing on each section of the tower, compare the post-processing results with the fourth design load, and perform safety verification on the tower fatigue load.

4. The method for verifying the safety of wind farm towers according to claim 3, characterized in that, In step 1), the material properties are characterized by the Wöhler index of the material. Three different material properties are selected, with Wöhler indices of 1, 4, and 10 respectively. In step 2), the first selected material property refers to a Wöhler index of 1. In step 3), the second selected material property refers to a Wöhler index of 4 and 10.

5. A method for verifying the safety of wind turbine generators in wind farms, characterized in that, The method includes the following steps: 1) Obtain the turbulence intensity values ​​of the wind turbine at different wind speeds at various turbine locations under different material properties, obtain the maximum turbulence intensity of the wind turbine under different material properties based on the turbulence intensity values, and determine the maximum external conditions of the wind turbine based on the external conditions of each turbine location. 2) Under the maximum turbulence intensity and maximum external conditions corresponding to the first selected material properties, perform blade ultimate load calculations for the fault conditions in operating conditions dlc1.3, dlc1.4, dlc1.5, and dlc2.2 and operating conditions dlc3.2, dlc4.2, and dlc6.2 specified in the IEC / GL standard. Blade ultimate load calculations are not performed for other operating conditions specified in the IEC / GL standard. 3) Under the maximum turbulence intensity and maximum external conditions corresponding to the first selected material properties, select the operating conditions dlc1.2, dlc3.1, dlc4.1 and dlc6.4 specified in the IEC / GL standard to carry out tower fatigue load calculations. Tower fatigue load calculations are not carried out for other operating conditions specified in the IEC / GL standard. 4) Under the maximum turbulence intensity and maximum external conditions corresponding to the second selected material properties, select the operating conditions dlc1.2, dlc3.1, dlc4.1 and dlc6.4 specified in the IEC / GL standard to carry out blade fatigue load calculation and tower fatigue load calculation respectively. Other operating conditions specified in the IEC / GL standard do not carry out blade and tower fatigue load calculation. 5) For the blade ultimate load calculation results obtained in step 2), post-process the ultimate load of each section of the blade and the bolt, compare the post-processed results with the first design load, and perform a safety check on the blade ultimate load. 6) Based on the tower ultimate load calculation results obtained in step 3), post-process the ultimate load of each section of the tower, compare the post-processed results with the second design load, and perform safety verification on the tower ultimate load. 7) Based on the blade fatigue load calculation results obtained in step 4), post-process the fatigue load of each section of the blade and the bolts, compare the post-processed results with the third design load, and perform a safety check on the blade fatigue load. 8) Based on the tower fatigue load calculation results obtained in step 4), perform fatigue load post-processing on each section of the tower, compare the post-processing results with the fourth design load, and perform safety verification on the tower fatigue load.

6. The method for safety verification of wind turbine generators in wind farms according to claim 5, characterized in that, In step 1), the material properties are characterized by the Wöhler index of the material. Three different material properties are selected, with Wöhler indices of 1, 4, and 10 respectively. In steps 2) and 3), the first selected material property refers to a Wöhler index of 1. In step 4), the second selected material property refers to a Wöhler index of 4 and 10.

7. A wind farm blade safety verification device, comprising a processor and a memory, wherein the processor is used to execute computer instructions stored in the memory, characterized in that, The computer instructions are used to implement the wind farm blade safety verification method according to claim 1 or 2.

8. A safety verification device for wind farm towers, comprising a processor and a memory, wherein the processor executes computer instructions stored in the memory, characterized in that... The computer instructions implement the wind farm tower safety verification method according to claim 3 or 4.

9. A safety verification device for wind turbine generators in a wind farm, the device comprising a processor and a memory, wherein the processor is used to execute computer instructions stored in the memory, characterized in that, The computer instructions are used to implement the wind farm wind turbine safety verification method as described in claim 5 or 6.

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