A safety evaluation method and system for a typhoon-resistant fan use scenario

Abstract

This invention discloses a safety assessment method and system for typhoon-resistant wind turbines in various application scenarios, within the field of wind turbine equipment testing. The method includes: selecting a conventional wind turbine and using the product of the upper load limit and the safety design margin as the extreme load for the typhoon-resistant wind turbine; extracting three-dimensional wind speed statistical indicators and spatiotemporal distribution characteristics of the turbulent wind field, simulating the turbulent wind environment under real typhoon conditions, including three-dimensional step-size wind speed time-series data; employing a wind turbine structural component load simulation model, calculating the load time-series data of key structural components of the typhoon-resistant wind turbine according to real-world typhoon-resistant control strategies; calculating the vulnerability parameters and fatigue damage parameters of the typhoon-resistant wind turbine based on the load time-series data of the structural components; and assessing the safety of the typhoon-resistant wind turbine in its application scenarios based on the vulnerability parameters and fatigue damage parameters. This invention addresses the lack of environmental safety assessment parameters in existing technologies, providing support for the construction of offshore wind power plants.

Description

Technical Field

[0001] This invention belongs to the field of wind turbine equipment testing, and in particular relates to a safety assessment method and system for typhoon-resistant wind turbine applications. Background Technology

[0002] Among various renewable energy sources, offshore wind power has advantages such as abundant wind energy resources, high power generation efficiency, and less land occupation, and its construction costs continue to decline rapidly, resulting in a rapid growth in its global deployment capacity.

[0003] However, coastal areas are the main deployment areas for offshore wind power and are also typhoon-prone areas. Large-scale offshore wind power deployments continue to face serious threats from typhoon conditions, which has become a key bottleneck restricting the safe and stable development of offshore wind power. Therefore, it is particularly important to conduct wind turbine safety assessments in response to typhoon conditions.

[0004] Currently, the industry lacks effective assessment models and methods specifically designed for typhoon-resistant offshore wind turbines to evaluate their safety. Existing technologies use ordinary wind conditions as the design reference for safety assessments. For example, the existing IEC 15MW reference wind turbine has a Class I wind condition rating and a design limit wind speed of only 50 m / s, which cannot meet the extreme wind conditions required in typhoon-prone areas.

[0005] Therefore, developing a safety assessment method and system that can effectively fill the above-mentioned technological gaps and realize the application scenario of typhoon-resistant wind turbines based on existing ordinary wind condition reference wind turbines is of great significance for promoting the safe development of the offshore wind power industry and has become a technical problem that urgently needs to be solved by those skilled in the art. Summary of the Invention

[0006] To address the shortcomings and improvement needs of existing technologies, this invention provides a safety assessment method and system for typhoon-resistant wind turbine applications. Its purpose is to assess the safety of wind turbine applications and subsequently use this assessment as a basis for determining the construction criteria of wind power plants. This solves the problem of missing environmental safety assessment technical parameters in existing technologies and provides technical support for the construction of suitable offshore wind power plants.

[0007] To achieve the above objectives, according to one aspect of the present invention, a safety assessment method for typhoon-resistant wind turbine applications is provided, comprising:

[0008] S1: Select a regular wind turbine. Based on the design wind conditions and operating conditions of the typhoon-resistant wind turbine, simulate and calculate the time series data of the structural load of the key structural components of the regular wind turbine under the design wind conditions and operating conditions of the typhoon-resistant wind turbine. Repeat the simulation and use the product of the upper limit of the load and the safety design margin in all simulation results as the extreme load of the typhoon-resistant wind turbine.

[0009] S2: For real typhoon wind conditions, extract the three-dimensional wind speed statistical indicators and spatiotemporal distribution characteristics of the turbulent wind field, and use the turbulent wind field simulation model to simulate and calculate the turbulent wind environment under real typhoon wind conditions, including three-dimensional step-size wind speed time series data.

[0010] S3: Based on the coupling relationship between the aerodynamic characteristics of real typhoon wind conditions, the elastic response of wind turbine components and the servo control strategy of wind turbine, a load simulation model of wind turbine structural components is adopted. According to the real anti-typhoon control strategy, the load time series data of key structural components of typhoon-resistant wind turbines are calculated, including: the three-dimensional force and bending moment of wind turbine structural components at each simulation time node under real wind conditions.

[0011] S4: Based on the load time series data of structural components, statistical methods, rainflow counting method, Goodman correction, SN curve and Miner rule are used to calculate the vulnerability parameters and fatigue damage parameters of typhoon-resistant wind turbines, and the safety of typhoon-resistant wind turbines in use scenarios is evaluated based on the vulnerability parameters and fatigue damage parameters.

[0012] In summary, the above-described technical solutions conceived in this invention can achieve the following beneficial effects:

[0013] This study develops an extreme load calibration method for a reference wind turbine under normal wind conditions, enabling rapid and reliable calibration of the load-bearing capacity of key structural components in typhoon-resistant wind turbines. This fills the current gap in the lack of standard typhoon-resistant wind turbines. Simultaneously, it optimizes the theoretical framework, methodology, and model system for safety assessment of typhoon-resistant wind turbines, providing a preliminary investment assessment tool for offshore wind power construction in typhoon-prone areas based on typhoon-resistant wind turbines. This is beneficial for ensuring the safety of wind turbine investment and operational reliability, maintaining the safe and stable development of offshore wind power and the reliable and economical operation of the power system, and providing strong technical support for my country's low-carbon transformation of power energy and the construction of new power systems. Attached Figure Description

[0014] Figure 1 The diagram shows a flowchart of a safety assessment method for typhoon-resistant wind turbine applications according to an embodiment of the present invention.

[0015] Figure 2 The diagram shown is a system block diagram of a safety assessment method for typhoon-resistant wind turbine applications according to an embodiment of the present invention.

[0016] Figure 3 The diagram shown is a simulated turbulent wind field provided according to an embodiment of the present invention.

[0017] Figure 4 The figure shows the bending moment at the bottom of the wind turbine tower at a wind speed of 57 m / s, according to an embodiment of the present invention.

[0018] Figure 5 The figure shows the bending moment at the root of a wind turbine blade at a wind speed of 57 m / s, according to an embodiment of the present invention. Detailed Implementation

[0019] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention. Furthermore, the technical features involved in the various embodiments of this invention described below can be combined with each other as long as they do not conflict with each other.

[0020] In this invention, the terms "first," "second," etc. (if present) in the invention and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence.

[0021] The International Electrotechnical Commission (IEC) has published IEC 61400-1:2019, "Wind turbine generators - Part 1: Design requirements", which specifically proposes a design standard for Class T wind turbines for typhoon conditions. This standard clearly requires that Class T wind turbines, which are wind turbine generators tailored for typhoon-prone areas, have a design limit average wind speed of 57 m / s, which is significantly higher than the existing Class I reference wind turbine's design limit wind speed of 50 m / s. This allows them to better meet the safe operation requirements of wind turbines under typhoon conditions.

[0022] However, to date, no reference wind turbine in the industry meets the Class T requirements of the IEC 61400-1:2019 standard. This makes it difficult for technical personnel to conduct systematic safety assessments of typhoon-resistant wind turbines, and to effectively verify whether they meet the safe operation requirements under typhoon conditions. This severely restricts the promotion and application of typhoon-resistant offshore wind power technology. Based on existing standards and existing wind turbines, this invention discloses a safety assessment method and system for typhoon-resistant wind turbine applications, filling the current gap in the availability of standard typhoon-resistant wind turbines. Those skilled in the art should understand that the description based on existing standards is only for better understanding of this invention and is not intended to limit the scope of the invention.

[0023] Example 1:

[0024] This invention discloses a safety assessment method for typhoon-resistant wind turbine applications, such as... Figure 1 As shown, it includes:

[0025] S1: Select a conventional wind turbine. Based on the design wind conditions and operating conditions of the typhoon-resistant wind turbine, simulate and calculate the time series data of the structural loads of the key structural components of the conventional wind turbine under the design wind conditions and operating conditions of the typhoon-resistant wind turbine. Repeat the simulation. The product of the upper limit of the load and the safety design margin in all simulation results is taken as the extreme load of the typhoon-resistant wind turbine. In the embodiments of this invention, the design is carried out in accordance with the requirements of the design method and scenario of the IEC international standard for typhoon-resistant wind turbines. The standard here is not restrictive.

[0026] S2: For real typhoon wind conditions, extract the three-dimensional wind speed statistical indicators and spatiotemporal distribution characteristics of the turbulent wind field, and use the turbulent wind field simulation model to simulate and calculate the turbulent wind environment under real typhoon wind conditions, including three-dimensional step-size wind speed time series data.

[0027] S3: Based on the coupling relationship between the aerodynamic characteristics of typhoon wind conditions, the elastic response of wind turbine components, and the servo control strategy of wind turbines, a load simulation model of wind turbine structural components is adopted. According to the anti-typhoon control strategy, the load time series data of key structural components of the typhoon-resistant wind turbine are calculated, including: the three-dimensional force and bending moment of the wind turbine structural components at each simulation time node under actual wind conditions; the actual anti-typhoon control strategy includes: starting the wind turbine to generate electricity when the wind speed is less than the cut-out wind speed; and shutting down the wind turbine when the wind speed is greater than or equal to the cut-out wind speed. The shutdown methods include: wind turbine idling and braking stop.

[0028] S4: Based on the load time series data of structural components, statistical methods, rainflow counting method, Goodman correction, SN curve and Miner rule are used to calculate the vulnerability parameters and fatigue damage parameters of typhoon-resistant wind turbines, and the safety of typhoon-resistant wind turbines in use scenarios is evaluated based on the vulnerability parameters and fatigue damage parameters.

[0029] In embodiments of the present invention, obtaining the extreme load of a typhoon-resistant wind turbine specifically includes:

[0030] S11: Based on the relevant parameters of turbulent wind field under typhoon conditions designed for typhoon-resistant wind turbines, including average wind speed and turbulence intensity, construct a standard turbulent wind field simulation model to obtain the random turbulent wind field across the entire wind turbine domain; the relevant parameters of turbulent wind field under typhoon conditions designed for typhoon-resistant wind turbines here refer to the parameters specified in the IEC standard.

[0031] S12: Based on the global random turbulent wind field of the wind turbine, standard typhoon-resistant control strategies, the geometric configuration of the wind turbine, and the aerodynamic-elastic-servo parameters of the wind turbine, a standard wind turbine structural load simulation model is constructed to calculate the force and bending moment time series data of the wind turbine structural components. When constructing the standard wind turbine structural load simulation model, the yaw angle, pitch angle, and shutdown methods required by the typhoon-resistant wind turbine design standard are adopted. The shutdown methods include: wind turbine idling and braking shutdown. The standard typhoon-resistant control strategies include: wind turbine idling at low speed without generating electricity strategy and braking shutdown strategy. The structural load of the wind turbine under the two strategies is calculated separately. The strategy with the best structural load mitigation effect is adopted as the control strategy. Here, the strategy with the best mitigation effect refers to the strategy with more stable load changes and smaller maximum load.

[0032] S13: Repeatedly simulate the global random turbulent wind conditions of the wind turbine under random heterogeneous wind fields with the same average wind speed and turbulence intensity;

[0033] S14: Calculate the force and bending moment time series data of each wind turbine structural component under each random heterogeneous wind field, and calculate the extreme loads of each wind turbine structural component based on the force and bending moment data and the safety design margin.

[0034] This invention, in addition to the previous safety assessment methods for reference wind turbines under normal wind conditions, designs extreme load reconstruction to realize the transformation of ordinary wind turbines into typhoon-resistant wind turbines, thereby enabling safety assessment for typhoon-resistant wind turbine usage scenarios.

[0035] Specifically, in one implementation, the extreme loads of typhoon-resistant wind turbines are determined by defining extreme wind conditions using turbulence intensity and average wind speed. A standard turbulent wind field simulation model, such as TurbSim, is then used to construct a full-domain turbulent wind condition for the turbine with a step size of 0.05 s. Subsequently, in conjunction with the design conditions for typhoon-resistant turbines specified in IEC standards, a standard wind turbine structural load simulation model, such as OpenFAST, is used to simulate the structural response of the wind turbine under design typhoon conditions, including bending moments at the tower base and blade roots. Based on the structural bending moments under the design conditions, and combined with the safety factor specified in IEC standards, the extreme loads of ordinary wind turbines are recalibrated, thereby obtaining the extreme loads of the typhoon-resistant turbine. Based on the calibrated extreme loads, the safety assessment of the typhoon-resistant wind turbine can be achieved.

[0036] For the safety assessment of typhoon-resistant wind turbine applications, a turbulent wind field defined by turbulence intensity and average wind speed is constructed based on the studied typhoon conditions. A turbulent wind field simulation model, such as the TurbSim model, is used to simulate wind speed time-series data. A wind turbine structural load simulation model, such as the OpenFAST model, is used to simulate the structural response of the wind turbine in this wind field. Based on the bending moment obtained from the standard model simulation, combined with the SN curve and the recalibrated extreme load, a wind turbine fatigue damage calculation model, such as the MLife model, is used to assess the fatigue damage of the wind turbine.

[0037] Typhoon wind conditions can be constructed based on average wind speed and turbulence intensity. Turbulence intensity is defined as the ratio of the standard deviation of wind speed fluctuations to the average wind speed, reflecting the degree of wind speed fluctuation. The calculation formula is as follows:

[0038]

[0039] in, Indicates turbulence intensity. The standard deviation of wind speed is represented by... This represents the average wind speed. Based on the wind speed characteristics of two typhoons, a random time series of wind speeds conforming to both characteristics can be constructed. In one embodiment, TurbSim, developed by NREL, is used to simulate turbulent wind speeds. This constructs a turbulent wind environment under typhoon conditions. According to the IEC 61400 2019 standard, a turbulent wind environment of 57 m / s and 18% turbulence can be constructed for wind turbine parameter calibration. Furthermore, any wind condition determined by the average wind speed and turbulence intensity can be constructed to simulate the wind turbine structural response and safety assessment under the typhoon conditions under study. For example, turbulence intensities include 18%, 16%, 14%, and 12%, and are not limited to these.

[0040] Furthermore, the practical typhoon-resistant control strategy in this invention includes: starting the wind turbine to generate electricity when the wind speed is less than the cut-out wind speed; and shutting down the wind turbine when the wind speed is greater than or equal to the cut-out wind speed. The shutdown methods include: turbine idling and brake shutdown. There are two ways to achieve the above-mentioned turbine shutdown: one is turbine idling, with the speed regulated by brakes to prevent it from becoming too high, while utilizing rotational damping to reduce structural damage to the turbine; the other is turbine locking, with the blades aligned with the propeller to statically resist constantly changing turbulent winds. Generally, the latter is more commonly used. Meanwhile, previous studies have suggested that under the former control logic, insufficient turbine damping can cause the blades to rotate at excessive speed, resulting in greater structural damage. Therefore, the latter static control strategy is adopted. It should be noted that regardless of the control strategy, the method and system for conducting typhoon-resistant wind turbine safety assessments using extreme parameter calibration are within the scope of protection of this patent.

[0041] Furthermore, extreme parameter evaluation of wind turbines requires the use of various design load cases (DLCs) specified by IEC. The following section, based on a technical report for a 15 MW wind turbine, will cover the following DLCs. This is merely an experimental scenario and is not intended to limit the scope of this invention.

[0042] According to IEC international standards, wind turbine design needs to consider the following load scenarios:

[0043] Table 1. Load scenarios involved in the extreme load study of wind turbines.

[0044]

[0045] The technical report for the 15 MW wind turbine clearly presents the evaluation results of all DLCs; however, DLC 6.1... The problem only involves wind conditions of 50 m / s, which is less than the 57 m / s requirement newly specified in IEC 61400-1 2019, therefore, recalibration of the extreme loads is necessary. In one embodiment of the invention, the yaw angle of the wind turbine is further set, for example, 8°, and the average wind speed is set, for example, 57 m / s, and the turbulence intensity is set, for example, 18%, to conduct recalibration of the wind turbine's extreme loads. The above parameters are only one embodiment; those skilled in the art can design different parameters and calculate the wind turbine's extreme loads according to the design accuracy.

[0046] In this invention, when conducting subsequent wind turbine safety assessments, turbulent wind conditions and wind turbine operating conditions are defined based on actual wind conditions, no longer constrained by the DLC framework.

[0047] In the embodiments of the present invention, the reference fan is generally of IEC Class I standard, as shown in the table below.

[0048] Table 2 Reference Fan Grades

[0049]

[0050] In the existing technology, due to the lack of a reference wind turbine for typhoon wind conditions, namely the Class T type wind turbine specified in IEC 61400-1 2019, it is necessary to calibrate a typhoon-resistant wind turbine based on such a reference wind turbine.

[0051] According to IEC 61400-1 2019, typhoon-resistant wind turbines must be designed to withstand typhoon winds of 57 meters per second. Therefore, the extreme load on the turbine needs to be greater than the extreme load at 57 meters per second. However, to ensure turbine reliability, an even higher extreme load is required, necessitating an amplification of the extreme load at 57 meters per second. IEC 61400 recommends using a safety factor of 1.35. Therefore, the extreme load at 57 meters per second needs to be multiplied by the safety factor of 1.35 to obtain the extreme load for the typhoon-resistant turbine. This is how the extreme load of a typhoon-resistant wind turbine is determined.

[0052] Furthermore, the vulnerability parameters and fatigue damage parameters of the typhoon-resistant wind turbine are calculated. The vulnerability parameters of the wind turbine reflect the probability of collapse of the wind turbine in a large number of random tests, as shown in the following formula.

[0053]

[0054] in, Parameters representing the vulnerability of wind turbines. This represents the average wind speed across all tests. This indicates the type of failure that occurred in the wind turbine, such as collapse, overturning, or blade breakage.

[0055] To calculate the vulnerability parameters of wind turbines, numerous random simulations are conducted under the same wind conditions. These simulations statistically analyze the probability of certain types of failures occurring, such as turbine collapse and blade breakage. This probability represents the vulnerability of the wind turbine.

[0056] On the other hand, fatigue damage to wind turbines reflects the extent to which their lifespan is shortened under the influence of typhoons. Vulnerability and fatigue damage are two dimensions of wind turbine safety assessment and are two indicators of wind turbine safety. Safety includes, but is not limited to, these two indicators.

[0057] In fatigue damage assessment, in one embodiment, TurbSim is used to simulate extreme turbulent wind environments, OpenFAST is used to simulate wind turbine structural loads, rainflow counting, Goodman correction, SN curves and Miner rules are employed, and MLife is used to assess the degree of fatigue damage to the blades and tower under the influence of tropical cyclones.

[0058] Rainflow counting algorithms are used to decompose load time series into multiple load cycles, each with different cycle numbers, amplitudes, and average values. This is applicable to load time series data for wind turbine structural components. The rainflow counting method is used to decompose the continuous load into a set of multiple discrete cyclic loads. Then, using the Goodman correction, these load cycles are converted into equivalent loads with a consistent average value, for example, assuming the average load is zero, the calculation formula is as follows:

[0059]

[0060] in, This indicates the amplitude range of the cyclic fixed average value after transformation. Indicates a fixed average load. Indicates the first One load cycle at an average load of The amplitude range at that time This indicates the maximum design load.

[0061] The number of failure cycles corresponding to each load cycle is calculated using the SN curve. In one implementation, the index for the blade is 10, and the index for the tower is 5. This is just one implementation method and is not limited to it. The formula for calculating the number of failure cycles is as follows:

[0062]

[0063] in, Indicates the first The number of failed loops corresponding to each loop. This indicates the SN curve index for different components.

[0064] Furthermore, the degree of damage corresponding to each load cycle is defined as the ratio of the number of cycles to the number of failure cycles, calculated as follows:

[0065]

[0066] in, Indicates the first The degree of fatigue damage per load cycle, This indicates the number of cycles for the load cycle.

[0067] Finally, the cumulative damage from all cycles is linearly superimposed according to Miner's rule to obtain the fatigue damage parameter D. The calculation formula is as follows:

[0068]

[0069] It should be noted that, regardless of whether the assessment is based on vulnerability or fatigue damage, as long as the safety of the typhoon-resistant wind turbine is evaluated after calibration under extreme load, it is within the scope of protection of this application.

[0070] Vulnerability parameter is the probability of wind turbine failure under a certain operating condition, while fatigue damage is the degree of fatigue damage to the wind turbine under a certain operating condition. For example, if the fatigue damage level is 10% and the wind turbine life is 25 years, then this typhoon has reduced the wind turbine life by 2.5 years. The above two indicators vary depending on industry requirements, risk appetite, or cost.

[0071] To better understand the construction process of the simulated turbulent wind field in the turbulent wind field simulation model of this invention, the following will use TurbSim to simulate turbulent wind as an example for explanation. Figure 3 As shown, using TurbSim, with an average wind speed of 57 m / s and a turbulence intensity of 18%, a schematic diagram of turbulent wind under typhoon conditions was constructed. The horizontal axis represents the simulation time node, and the vertical axis represents the wind speed.

[0072] Furthermore, to better understand the process of determining the extreme loads of wind turbines, a 15MW wind turbine is used to demonstrate the process of recalibrating the extreme loads, such as... Figure 4 The diagram shows the structural response simulation of a 15MW reference wind turbine at 57 m / s, illustrating the change in the bending moment at the bottom of the wind turbine tower. The horizontal axis represents the simulation time point, and the vertical axis represents the bending moment at the bottom of the wind turbine tower. Figure 5 The diagram shows the structural response simulation of a 15 MW reference wind turbine at 57 m / s, illustrating the variation of the bending moment at the turbine blade root. The horizontal axis represents the simulation time point, and the vertical axis represents the bending moment at the turbine blade root. Based on the maximum bending moment and a safety factor of 1.35, the ultimate loads at the turbine blade root and the bottom of the tower are calibrated as 184 MNm and 1309.5 MNm, respectively. The technical parameters of a 15MW wind turbine in the IEC standard are shown below:

[0073] Table 3

[0074]

[0075] The safety assessment of a 15MW wind turbine includes evaluating fatigue damage parameters and conducting extensive experiments under extreme wind speeds to assess vulnerability parameters. Based on extreme loads, using an average wind speed of 60 m / s as an example, a fatigue damage assessment of the turbine is conducted. A value of 5 is used as the exponent of the tower's SN curve, and 10 is used as the exponent at the blade root. This is merely an example; other exponents can be selected.

[0076] Calculations show that under one hour of continuous wind conditions, the fatigue damage level at the bottom of the wind turbine tower is 0.2298, and the fatigue damage level at the blade root is 0.0120. Assuming a wind turbine lifespan of 25 years, the above fatigue damage corresponds to 5.75 years and 0.3 years, respectively. That is, when typhoon conditions with an average wind speed of 60 meters per second continue for one hour, the tower lifespan decreases by 5.75 years, while the blade lifespan is reduced by 0.3 years.

[0077] Example 2:

[0078] This invention discloses a system for implementing the safety assessment method for the application scenario of typhoon-resistant wind turbines in Embodiment 1, comprising: an extreme load acquisition module: selecting a regular wind turbine, and based on the design wind conditions and operating conditions of the typhoon-resistant wind turbine, simulating and calculating the structural load time sequence data of key structural components of the regular wind turbine under the design wind conditions and operating conditions of the typhoon-resistant wind turbine, repeating the simulation, and using the product of the upper limit of the load and the safety design margin in all simulation results as the extreme load of the typhoon-resistant wind turbine;

[0079] Three-dimensional step-time typhoon turbulent wind speed calculation module: For real typhoon wind conditions, it extracts three-dimensional wind speed statistical indicators and spatiotemporal distribution characteristics of turbulent wind field, and uses a turbulent wind field simulation model to simulate and calculate the turbulent wind environment under real typhoon wind conditions, including three-dimensional step-time wind speed data.

[0080] Load time series data calculation module: Using the load simulation model of wind turbine structural components, and based on the actual typhoon-resistant control strategy, calculate the load time series data of key structural components of typhoon-resistant wind turbines, including: the three-dimensional force and bending moment of wind turbine structural components at each simulation time point under actual wind conditions.

[0081] Evaluation module: Based on the load time series data of structural components, statistical methods, rainflow counting method, Goodman correction, SN curve and Miner rule are used to calculate the vulnerability parameters and fatigue damage parameters of typhoon-resistant wind turbines, and the safety of typhoon-resistant wind turbines in use scenarios is evaluated based on the vulnerability parameters and fatigue damage parameters.

[0082] Reference to the working process of this system Figure 2 As shown, the system in this embodiment is used to implement the safety assessment method for typhoon-resistant wind turbine application scenarios in Embodiment 1. Therefore, the specific implementation of this system can be found in the embodiment section of the safety assessment method for typhoon-resistant wind turbine application scenarios above. The specific implementation can be referred to the description of the corresponding embodiments, which will not be elaborated here.

[0083] In summary, the safety assessment method and system for typhoon-resistant wind turbine applications disclosed in this invention, based on the extreme load calibration of a reference wind turbine under normal wind conditions, enables rapid and reliable calibration of the load-bearing capacity of key structural components of typhoon-resistant wind turbines, filling the current gap in the lack of standard typhoon-resistant wind turbines. Simultaneously, it optimizes the theoretical framework, methodology, and model system for safety assessment specifically for typhoon-resistant wind turbines, providing a preliminary investment assessment tool for offshore wind power construction in typhoon-prone areas based on typhoon-resistant wind turbines. This is beneficial for ensuring the safety of wind turbine investment and operational reliability, maintaining the safe and stable development of offshore wind power and the reliable and economical operation of the power system, and providing strong technical support for my country's low-carbon transformation of power energy and the construction of a new power system.

[0084] Those skilled in the art will readily understand that the above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A safety assessment method for typhoon-resistant wind turbine applications, characterized in that, include: S1: Select a regular wind turbine. Based on the design wind conditions and operating conditions of the typhoon-resistant wind turbine, simulate and calculate the time series data of the structural load of the key structural components of the regular wind turbine under the design wind conditions and operating conditions of the typhoon-resistant wind turbine. Repeat the simulation and use the product of the upper limit of the load and the safety design margin in all simulation results as the extreme load of the typhoon-resistant wind turbine. S2: For real typhoon wind conditions, extract the three-dimensional wind speed statistical indicators and spatiotemporal distribution characteristics of the turbulent wind field, and use the turbulent wind field simulation model to simulate and calculate the turbulent wind environment under real typhoon wind conditions, including three-dimensional step-size wind speed time series data. S3: Based on the coupling relationship between the aerodynamic characteristics of real typhoon wind conditions, the elastic response of wind turbine components and the servo control strategy of wind turbine, a load simulation model of wind turbine structural components is adopted. According to the real anti-typhoon control strategy, the load time series data of key structural components of typhoon-resistant wind turbines are calculated, including: the three-dimensional force and bending moment of wind turbine structural components at each simulation time node under real wind conditions. S4: Based on the load time series data of structural components, statistical methods, rainflow counting method, Goodman correction, SN curve and Miner rule are used to calculate the vulnerability parameters and fatigue damage parameters of typhoon-resistant wind turbines, and the safety of typhoon-resistant wind turbines in use scenarios is evaluated based on the vulnerability parameters and fatigue damage parameters.

2. The safety assessment method for typhoon-resistant wind turbine applications according to claim 1, characterized in that, The extreme loads of the wind turbine calculated in S1 include: S11: Based on the relevant parameters of turbulent wind field under typhoon conditions designed for typhoon-resistant wind turbines, including average wind speed and turbulence intensity, construct a standard turbulent wind field simulation model to obtain the random turbulent wind field across the entire wind turbine domain; S12: Based on the global random turbulent wind field of the wind turbine, the standard anti-typhoon control strategy, the geometric configuration of the wind turbine, and the aerodynamic-elastic-servo parameters of the wind turbine, a standard wind turbine structural load simulation model is constructed to calculate the force and bending moment time series data of the wind turbine structural components. S13: Repeatedly simulate the global random turbulent wind conditions of the wind turbine under random heterogeneous wind fields with the same average wind speed and turbulence intensity; S14: Calculate the force and bending moment time series data of each wind turbine structural component under each random heterogeneous wind field, and calculate the extreme loads of each wind turbine structural component based on the force and bending moment data and the safety design margin.

3. The safety assessment method for typhoon-resistant wind turbine application scenarios according to claim 2, characterized in that, Various turbulence intensities were designed in the standard turbulent wind field simulation model, including 18%, 16%, 14%, and 12%.

4. The safety assessment method for typhoon-resistant wind turbine application scenarios according to claim 2, characterized in that, When constructing the S12 standard wind turbine structural load simulation model, the yaw angle, pitch angle and shutdown method required by the typhoon-resistant wind turbine design standard are adopted. The shutdown methods include: wind turbine idling and brake shutdown.

5. The safety assessment method for typhoon-resistant wind turbine application scenarios according to claim 2, characterized in that, The standard typhoon control strategies in S12 include: a low-speed idling strategy for wind turbines that do not generate electricity and a braking shutdown strategy. Structural load calculations for the wind turbines are carried out under both strategies, and the strategy with the best structural load mitigation effect is adopted as the control strategy.

6. The safety assessment method for typhoon-resistant wind turbine applications according to claim 1, characterized in that, The actual typhoon control strategy in S3 includes: when the wind speed is less than the cut-out wind speed, start the wind turbine to generate electricity; when the wind speed is greater than or equal to the cut-out wind speed, shut down the wind turbine. The shutdown methods include: wind turbine idling and brake shutdown.

7. The safety assessment method for typhoon-resistant wind turbine application scenarios according to claim 1, characterized in that, The calculation of the vulnerability parameters of the wind turbine includes: in, Parameters indicating the vulnerability of the wind turbine. This represents the average wind speed across all tests. This indicates the type of failure that occurred in the wind turbine, including collapse, overturning, or blade breakage.

8. The safety assessment method for typhoon-resistant wind turbine application scenarios according to claim 1, characterized in that, Load time series data for wind turbine structural components The rainflow counting method is used to decompose the continuous load into a set of multiple discrete cyclic loads. Calculate the fatigue damage parameter D of the fan: in, This represents each discrete cyclic load after decomposition of continuous time-series load data using the rainflow counting method. Indicates the total number of cyclic loads. This indicates the range of amplitude values ​​for the cyclical fixed average value after transformation. Indicates a fixed average load. Indicates the first One load cycle at an average load of The amplitude range at that time This represents the maximum design load, which is the extreme load calibrated in S1. Indicates the first The number of failed loops corresponding to each loop. Indicates the SN curve index of different components; Indicates the first The degree of fatigue damage per load cycle, This indicates the number of cycles for the load cycle.

9. The safety assessment method for typhoon-resistant wind turbine application scenarios according to claim 8, characterized in that, In the calculation of fatigue damage parameters, the SN curve index m of the component is selected based on simulation comparison. The index value reflects the fatigue resistance of the material. The indexes for blade materials include 8, 10, and 12, and the indexes for tower materials include 3, 4, and 5. The material index that meets the design requirements is selected.

10. A system for implementing a safety assessment method for typhoon-resistant wind turbine applications, characterized in that, include: Extreme load acquisition module: Select a regular wind turbine, and based on the design wind conditions and operating conditions of the typhoon-resistant wind turbine, simulate and calculate the time series data of the structural load of the key structural components of the regular wind turbine under the design wind conditions and operating conditions of the typhoon-resistant wind turbine. Repeat the simulation, and use the product of the upper limit of the load and the safety design margin in all simulation results as the extreme load of the typhoon-resistant wind turbine. Three-dimensional step-time typhoon turbulent wind speed calculation module: For real typhoon wind conditions, it extracts three-dimensional wind speed statistical indicators and spatiotemporal distribution characteristics of turbulent wind field, and uses a turbulent wind field simulation model to simulate and calculate the turbulent wind environment under real typhoon wind conditions, including three-dimensional step-time wind speed data. Load time series data calculation module: Using the load simulation model of wind turbine structural components, and based on the actual typhoon-resistant control strategy, calculate the load time series data of key structural components of typhoon-resistant wind turbines, including: the three-dimensional force and bending moment of wind turbine structural components at each simulation time point under actual wind conditions. Evaluation module: Based on the load time series data of structural components, statistical methods, rainflow counting method, Goodman correction, SN curve and Miner rule are used to calculate the vulnerability parameters and fatigue damage parameters of typhoon-resistant wind turbines, and the safety of typhoon-resistant wind turbines in use scenarios is evaluated based on the vulnerability parameters and fatigue damage parameters.

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