A method for protecting wind turbines after blade damage and related components

Abstract

This invention discloses a method and related components for protecting wind turbines after blade damage, relating to the field of wind power protection. By real-time monitoring of parameters related to blade damage, when blade damage is detected, the pitch angle of each blade is adjusted to a feathering angle at a certain rate. Simultaneously, the generator torque is reduced at a certain rate, gradually decreasing the wind turbine's rotor speed. When the rotor nearly stops rotating and all blades are at a feathering angle, the generator is shut down. When the wind turbine is in a balanced state, the drive shaft and rotor are locked, completing the shutdown protection. By reducing the generator torque and adjusting the feathering angle to lower the rotor speed after blade damage is detected, the generator can be safely shut down. Furthermore, locking the drive shaft and rotor after the wind turbine is in a balanced state minimizes the damage caused by blade damage to the wind turbine, effectively protecting the wind turbine itself after blade damage.

Description

Technical Field

[0001] This invention relates to the field of wind power protection, and in particular to a method and related components for protecting wind turbines after blade damage. Background Technology

[0002] During their service life, wind turbine blades may be damaged or even break due to direct impact or fatigue aging. When a wind turbine experiences sudden blade damage and breakage during normal operation, it can cause serious accidents such as structural damage, destruction, or even tower collapse. Therefore, it is crucial to protect the wind turbine itself promptly upon detecting blade damage during normal operation. Current technology typically involves immediately shutting down the generator and releasing its torque after blade damage is detected. While this method is effective when the blade is intact, once a blade breaks, the resulting imbalance in mass and momentum on the rotor plane exacerbates the dynamic response under these unbalanced conditions, leading to further damage to the wind turbine. Therefore, this approach is insufficient to effectively protect the wind turbine after blade breakage. Summary of the Invention

[0003] The purpose of this invention is to provide a wind turbine protection method and related components after blade damage, which can safely shut down the generator, minimize the damage to the wind turbine caused by blade damage, and effectively protect the wind turbine body when blade damage occurs.

[0004] To address the aforementioned technical problems, this invention provides a method for protecting wind turbine generators after blade damage, comprising:

[0005] When a blade damage fault is detected in the wind turbine, the pitch angle of each blade of the wind turbine is adjusted to the feathering angle at a first preset rate.

[0006] The generator torque of the wind turbine is reduced by a second preset rate curve, thereby reducing the rotor speed of the wind turbine.

[0007] Determine whether the wind turbine speed is less than the preset speed within a preset time period, and whether the pitch angle of each blade is a feathering angle.

[0008] If both are yes, then shut down the generator in the wind turbine and determine whether the wind turbine is in a balanced state;

[0009] If the wind turbine is in a balanced state, the drive shaft and rotor of the wind turbine are locked to protect the wind turbine.

[0010] Preferably, before adjusting the pitch angle of each blade of the wind turbine to the feathering angle at a first preset rate, the method further includes:

[0011] Obtain the various dynamic response parameters of the wind turbine;

[0012] Each of the dynamic response parameters is multiplied by its corresponding preset weight value to obtain the blade failure judgment factor corresponding to each of the dynamic response parameters.

[0013] The sum of all the blade failure judgment factors is taken as the blade status value of the wind turbine.

[0014] Determine whether the blade status value is greater than a preset fault value;

[0015] If so, it is determined that a blade damage fault has been detected in the wind turbine unit;

[0016] If not, it is determined that no blade damage fault was detected in the wind turbine unit.

[0017] Preferably, the dynamic response parameters include one or more of the following: the pitch torque of each blade in the wind turbine, the lateral displacement of the nacelle at the top of the wind turbine relative to the windward side of the wind turbine, the lateral acceleration of the nacelle at the top of the wind turbine relative to the windward side of the wind turbine, and the torque at the base of the wind turbine.

[0018] Preferably, obtaining various dynamic response parameters in the wind turbine includes:

[0019] Various dynamic response parameters of the wind turbine are obtained by using displacement sensors, acceleration sensors, and force sensors installed in the wind turbine.

[0020] Preferably, after determining that a blade damage fault has been detected in the wind turbine, the method further includes:

[0021] A prompt signal is generated and sent to the prompt module so that the prompt module can issue a prompt.

[0022] Preferably, before adjusting the pitch angle of each blade of the wind turbine to the feathering angle at a first preset rate, the method further includes:

[0023] Determine the dimensions of each blade of the wind turbine and the current rotor speed of the wind turbine;

[0024] The first preset rate and the second preset rate curve are determined based on the size of each blade and the current wind turbine rotation speed;

[0025] The process involves adjusting the pitch angle of each blade of the wind turbine to a feathering angle at a first preset rate, and then reducing the generator torque of the wind turbine at a second preset rate curve.

[0026] Preferably, determining whether the wind turbine is in a balanced state includes:

[0027] Determine the phase angle of each blade in the wind turbine unit;

[0028] Determine whether the wind turbine is in a balanced state based on each phase angle and the rotor speed.

[0029] When the wind turbine speed is zero and the angles of each phase angle are within the preset angle range, it is determined that the wind turbine is in a balanced state and the step of locking the drive shaft and wind turbine of the wind turbine unit is entered.

[0030] Otherwise, if the wind turbine is not in a balanced state, return to the step of determining whether the wind turbine is in a balanced state based on the phase angles and the rotor speed.

[0031] This application also provides a wind turbine protection device after blade damage, including:

[0032] Memory, used to store computer programs;

[0033] A processor is used to execute the computer program to implement the steps of the wind turbine protection method described above after blade damage.

[0034] This application also provides a wind turbine generator, including a wind turbine generator body and a wind turbine generator protection device as described above for blade damage.

[0035] The wind turbine body is connected to the wind turbine protection device after the blades are damaged.

[0036] This application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the wind turbine protection method described above after blade damage.

[0037] This application provides a wind turbine protection method and related components after blade damage, relating to the field of wind power protection. By real-time monitoring of parameters related to blade damage, when blade damage is detected, the pitch angle of each blade is adjusted to a feathering angle at a certain rate. Simultaneously, the generator torque is reduced at a certain rate, gradually decreasing the wind turbine rotor speed. When the rotor nearly stops rotating and all blades are at a feathering angle, the generator is shut down. When the wind turbine is in a balanced state, the drive shaft and rotor are locked, completing the shutdown protection. By reducing the generator torque and adjusting the feathering angle to lower the rotor speed after blade damage is detected, the generator can be safely shut down. Furthermore, locking the drive shaft and rotor after the wind turbine is in a balanced state minimizes the damage caused by blade damage, effectively protecting the wind turbine itself after blade damage. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the prior art and embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0039] Figure 1 A flowchart illustrating a wind turbine protection method for blade damage provided in this application;

[0040] Figure 2 A schematic diagram of the blade balance position of a wind turbine provided in this application;

[0041] Figure 3 A schematic diagram of the dynamic response parameters of a wind turbine provided in this application;

[0042] Figure 4 This is a schematic diagram comparing the wind turbine speeds of this application and existing technologies;

[0043] Figure 5 This is a schematic diagram comparing the left and right displacements of this application and the prior art;

[0044] Figure 6 This is a schematic diagram comparing the left and right accelerations at the top of the tower in this application with those in the prior art;

[0045] Figure 7 This is a schematic diagram comparing the tower top torque of this application with that of the prior art;

[0046] Figure 8 A flowchart of another wind turbine protection method after blade damage provided in this application;

[0047] Figure 9 This application provides a structural schematic diagram of a wind turbine protection device for blade damage. Detailed Implementation

[0048] The core of this invention is to provide a wind turbine protection method and related components after blade damage, which can safely shut down the generator, minimize the damage to the wind turbine caused by blade damage, and effectively protect the wind turbine body when blade damage occurs.

[0049] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0050] To address internal faults and complex external conditions, various shutdown measures are implemented in practical applications to protect the structural safety of wind turbines. For example, when the converter malfunctions or trips, the wind turbine triggers a grid power outage shutdown; when personnel manually shut down the turbine via the HMI (Human Machine Interface) or the wind speed is lower than the cut-out wind speed, the wind turbine triggers normal shutdown measures; when excessive differences in the pitch angles of the individual blades are detected, the wind turbine triggers a safety chain shutdown measure; when excessive rotor speed is detected, the wind turbine triggers a rapid shutdown measure, etc.

[0051] When a blade breaks, existing technology detects significant acceleration at the top of the tower, typically triggering an emergency shutdown—directly shutting down the generator and releasing its torque. However, because the wind turbine tower top is significantly affected by wind speed and blade rotation, resulting in substantial acceleration, directly shutting down the generator can cause structural damage due to inertia and the sudden power outage. Therefore, emergency shutdown measures are unsuitable for wind turbines damaged by blade failure. Consequently, it is necessary to research and propose control and protection methods for wind turbines when blades break, to quickly identify blade damage, reduce stress on the turbine itself, achieve safe shutdown, and improve the structural safety of the wind turbine.

[0052] To solve the above technical problems, please refer to Figure 1 , Figure 1 The wind turbine protection method provided in this application after blade damage includes:

[0053] S1: When a blade damage fault is detected in the wind turbine, the pitch angle of each blade of the wind turbine is adjusted to the feathering angle at the first preset rate.

[0054] S2: Reduce the generator torque of the wind turbine by using the second preset rate curve, thereby reducing the wind turbine rotor speed;

[0055] S3: Determine whether the wind turbine speed is less than the preset speed within the preset time period, and whether the pitch angle of each blade is a feathering angle.

[0056] S4: If all are yes, then shut down the generator in the wind turbine unit;

[0057] S5: Determine if the wind turbine is in a balanced state;

[0058] S6: If in a balanced state, lock the wind turbine's drive shaft and rotor to complete the protection of the wind turbine.

[0059] When a blade breaks or fails during wind turbine operation, the imbalance in mass and momentum between the damaged and healthy blades causes the entire wind turbine structure to shake during rotation, leading to damage to the turbine itself. The inertia in a certain direction caused by this imbalance means that emergency shutdown would subject the turbine to an even greater force in that direction, further damaging it. Therefore, upon detecting blade damage or breakage, this application does not implement emergency shutdown measures. Instead, it adjusts the blade pitch angle and reduces engine torque at a certain rate to rapidly reduce the rotor speed until it stops. Both the first and second preset rate curves need to be set appropriately based on the actual model and class of the wind turbine. Setting the rate too high may damage the turbine, while setting it too low hinders rapid shutdown and can also cause damage.

[0060] Adjusting the blade pitch angle to a feathering angle means minimizing the angle between the blade and the windward surface, thus reducing the blade's wind-receiving surface and weakening the aerodynamic driving effect on the wind turbine. Generally, the angle perpendicular to the plane of the wind turbine blades is the feathering angle. Furthermore, because wind turbine blades are typically large, they will still experience slight rotation due to aerodynamic forces even after the turbine has stopped rotating. Therefore, to determine if the turbine has stopped, it is only necessary to check if the turbine speed is consistently lower than a preset speed over a period of time. This preset speed can be set to a very small value based on actual conditions.

[0061] After the wind turbine rotor stops rotating, although damage to the turbine body from blade failure is largely avoided, the mass imbalance between the blades may still exert some stress on the turbine body. Therefore, after the rotor stops rotating, the generator is shut down first. At this point, the blade imbalance will generate a certain force, causing the rotor to continue rotating slowly. As the rotor continues to rotate and gradually approaches the blade equilibrium position, this force will decrease. When it is completely in equilibrium, this force is essentially zero. At this point, the stress on the turbine body is minimized, so high-speed shaft braking can be applied to lock the drive shaft and rotor, protecting the turbine and minimizing the internal imbalance forces, thus achieving safe shutdown and structural protection. For a simple example, please refer to... Figure 2 , Figure 2 This is a schematic diagram of the balance position of a wind turbine blade provided in this application. A wind turbine usually has three blades. If one of the blades is completely broken, the balance position is that the broken blade is perpendicular to the ground and points to the sky, while the other two blades are located at vertically symmetrical positions on both sides of the broken blade.

[0062] Please refer to Figure 4 , 5 6 and 7 Figure 4 This is a schematic diagram comparing the wind turbine speeds of this application and existing technologies. Figure 5 This is a schematic diagram comparing the left and right displacements of this application and the prior art. Figure 6 This is a schematic diagram comparing the left and right accelerations at the top of the tower in this application with those in the prior art. Figure 7 This diagram illustrates a comparison of the tower top torque between this application and existing technologies. In existing technologies, when blade damage or breakage occurs, an emergency shutdown scheme is triggered. However, this application considers that triggering an emergency shutdown scheme would further damage the wind turbine, and therefore proposes an optimized shutdown scheme based on... Figure 4 It is known that while existing technologies can effectively reduce wind turbine speed initially, the turbine continues to spin due to inertia after power generation is turned off and torque is released, requiring a considerable amount of time for the turbine speed to approach zero. This application, however, by actively setting a first preset rate and a second preset rate curve, and simultaneously reducing engine torque and adjusting the blades to a feathering angle, can quickly and effectively reduce the wind turbine speed. Figure 5 It is known that, because the wind turbine in the prior art rotates for a longer time and at a relatively faster speed, the lateral displacement of the tower top is greater than that of the method in this application; according to Figure 6 and Figure 7It is known that as more parts of the blade break (i.e., fewer parts of the blade remain), the greater the difference between the damaged and good blades becomes, the more severe the imbalance of the wind turbine becomes, which in turn leads to greater lateral acceleration and tower torque, and the wind turbine rotates for a longer time and at a relatively faster speed, thus causing further damage to the wind turbine. This application reduces the wind turbine speed by actively reducing the generating torque and adjusting the blade feathering angle, which can quickly and effectively reduce lateral acceleration and tower torque.

[0063] Furthermore, if no blade damage fault is detected in the wind turbine, the wind turbine continues to operate normally.

[0064] In summary, by real-time monitoring of parameters related to blade damage, when blade damage is detected, the pitch angle of each blade is adjusted to a feathering angle at a certain rate. Simultaneously, the generator torque is reduced at a certain rate, gradually decreasing the wind turbine's rotor speed. When the rotor nearly stops rotating and all blades are at a feathering angle, the generator is shut down. Once the wind turbine is in a balanced state, the drive shaft and rotor are locked, completing the shutdown protection. By reducing generator torque and adjusting the feathering angle to lower the rotor speed after blade damage is detected, the generator can be safely shut down. Furthermore, locking the drive shaft and rotor after the wind turbine is in a balanced state minimizes the damage caused by blade damage to the wind turbine, effectively protecting the wind turbine itself after blade damage.

[0065] Based on the above embodiments:

[0066] As a preferred embodiment, before adjusting the pitch angle of each blade of the wind turbine to the feathering angle at a first preset rate, the method further includes:

[0067] Obtain various dynamic response parameters in the wind turbine;

[0068] Each dynamic response parameter is multiplied by its corresponding preset weight value to obtain the blade failure judgment factor corresponding to each dynamic response parameter.

[0069] The sum of the failure judgment factors of each blade is used as the blade status value of the wind turbine.

[0070] Determine if the blade status value is greater than the preset fault value;

[0071] If so, it is determined that a blade damage fault has been detected in the wind turbine unit;

[0072] If not, it is determined that no blade damage fault was detected in the wind turbine.

[0073] To accurately determine whether a wind turbine has blade damage, this application requires continuously acquiring various dynamic response parameters of the wind turbine. These dynamic response parameters specifically refer to those that change significantly when a blade breaks due to damage. The selected parameters include one or more of the following: blade pitch torque, tower top lateral displacement, tower top lateral acceleration, and tower base torque. Because the instantaneous behavior of a wind turbine with blade damage and breakage is characterized by a significant difference in pitch torque between the damaged and healthy blades, this causes the tower top of the wind turbine to sway laterally. This results in a significant increase in lateral dynamic response parameters such as tower top lateral displacement, tower top lateral acceleration, and tower base torque. Therefore, these parameters are strongly correlated with blade damage and breakage, and are thus selected as dynamic response parameters.

[0074] Please refer to Figure 3 , Figure 3 This is a schematic diagram of the dynamic response parameters of a wind turbine provided in this application. The left and right swaying of the tower top refers to the swaying of the tower top to the left and right sides of the windward side of the wind turbine with the windward side of the turbine as the front. The left and right acceleration refers to the acceleration of the tower top when swaying to the sides. The tower base torque refers to the torque brought to the tower base when the tower top sways. The blade pitch torque refers to the torque formed by the aerodynamic force and resistance between the blade and the wind turbine due to the rotation.

[0075] When determining whether a blade is damaged or broken based on dynamic response parameters, considering that different parameters correspond to different behaviors in their actual values, and some parameters are more indicative of blade damage or breakage, it is necessary to assign different weights to different parameters based on their impact on the blade's performance. A higher weight indicates greater importance of that parameter in determining whether the blade is damaged or broken. For example, during normal operation of a wind turbine, encountering aerodynamic forces from both sides will cause the turbine to sway slightly; therefore, the weights for lateral displacement and acceleration are relatively low. When the turbine sways, it causes a change in the tower base torque. However, under normal circumstances, because the blade mass is balanced, there is no additional balancing force, so the tower base torque is small. When a blade is damaged and broken, causing a mass imbalance, the tower base torque becomes very large. Therefore, the tower base torque can clearly indicate whether the blade is damaged or broken, hence its higher weight. Similarly, regarding blade pitch torque, as mentioned above, there is a significant difference between the pitch torque of a damaged blade and a healthy blade when the blade is damaged or broken. Therefore, pitch torque can also clearly indicate whether the blade is damaged or broken, hence its higher weight. In practical applications, these parameters are multiplied by their respective weights and then summed to obtain the overall blade condition value of the wind turbine. A preset fault value is set as a threshold based on the blade condition value during normal operation. If the blade condition value is detected to be greater than this threshold in actual application, it can be determined that the blade is damaged or broken. Based on this, it is possible to accurately determine whether the wind turbine has a blade damage fault.

[0076] As a preferred embodiment, the dynamic response parameters include one or more of the following: the pitch torque of each blade in the wind turbine, the lateral displacement of the nacelle at the top of the tower relative to the windward side of the wind turbine, the lateral acceleration of the nacelle at the top of the tower relative to the windward side of the wind turbine, and the torque at the base of the tower.

[0077] In a preferred embodiment, displacement sensors, acceleration sensors, and force sensors installed in the wind turbine are used to acquire various dynamic response parameters of the wind turbine.

[0078] To easily obtain various dynamic response parameters, this application incorporates multiple types of sensors throughout the wind turbine. A displacement sensor is located at the top of the tower to detect the lateral displacement, an acceleration sensor to detect the lateral accelerometer at the top, a force sensor to detect the pitch torque of each blade, and a force sensor at the bottom of the tower to detect the torque at the bottom. By acquiring millisecond-level time-history data of characteristic parameters through these sensors, effective data support can be provided for subsequent assessments of blade damage and breakage. Furthermore, the processor does not need to calculate the various dynamic response parameters manually, allowing for simple acquisition of these parameters.

[0079] Please refer to the following: Figure 8 , Figure 8 The flowchart of another wind turbine protection method after blade damage provided in this application shows that after the wind turbine is started, the processor continuously detects several dynamic response parameters in the wind turbine through various sensors. If the blade is determined to be damaged based on these dynamic response parameters, the blade damage protection method is executed, which is to execute the method of adjusting the blade pitch angle to the feathering angle at a first preset speed and reducing the power generation torque according to the second preset rate curve. Then, it is determined whether the current state of the wind turbine meets the shutdown conditions, that is, whether the wind turbine speed is zero and all blades are feathered. If so, the generator is shut down, the wind turbine is allowed to slowly rotate to the equilibrium position, and then the drive shaft and wind turbine are locked to complete the protection of the wind turbine.

[0080] As a preferred embodiment, before adjusting the pitch angle of each blade of the wind turbine to the feathering angle at a first preset rate, the method further includes:

[0081] Determine the dimensions of each blade of the wind turbine and the current rotor speed of the wind turbine;

[0082] The first preset rate and the second preset rate curve are determined based on the size of each blade and the current rotor speed.

[0083] The next step is to adjust the pitch angle of each blade of the wind turbine to the feathering angle at a first preset rate.

[0084] To determine a reasonable shutdown rate, this application requires establishing two preset rates based on the current state of each blade. Specifically, the actual reduction rate needs to be determined based on the actual blade size and the current rotor speed. Larger blades have greater inertia, and a faster reduction rate will cause greater damage to the wind turbine. Similarly, a higher rotor speed also results in greater inertia, so the reduction rate cannot be too rapid. It is evident that there is a negative correlation between blade size and current rotor speed and the first / second preset rate curve. Based on this, by setting the generator torque and blade feathering rate, the rotor speed is reduced reasonably and quickly to minimize the destructive effect of rotor imbalance caused by blade damage and breakage on the wind turbine structure. Based on this, a reasonable shutdown rate can be determined.

[0085] As a preferred embodiment, determining whether a wind turbine is in a balanced state includes:

[0086] Determine the phase angle of each blade in the wind turbine;

[0087] Determine whether the wind turbine is in a balanced state based on each phase angle and the rotor speed.

[0088] When the wind turbine speed is zero and the angles of each phase angle are within the preset angle range, it is determined that it is in a balanced state and enters the step of locking the drive shaft and wind turbine of the wind turbine unit.

[0089] Otherwise, it is determined that the wind turbine is not in a balanced state, and the process returns to the step of determining whether the wind turbine is in a balanced state based on each phase angle and the rotor speed.

[0090] To easily determine whether a wind turbine is in a balanced state, this application uses the phase angle of each blade. Specifically, the phase angle refers to the angle between each blade and a preset coordinate axis. This coordinate axis can typically be a straight line parallel or perpendicular to the ground with the center point of the wind turbine as the origin. The blade is essentially a line segment with one end at the origin, and the angle between them is the phase angle. When the wind turbine is in a balanced state, the phase angles of the blades are usually a fixed value. For example, if the coordinate axis is a straight line perpendicular to the ground, and a wind turbine has three blades, when one of them breaks, the turbine's equilibrium position is such that the broken blade points vertically to the sky, while the other two blades are located symmetrically on either side of the broken blade. Mapped to the coordinate system, the broken blade overlaps the coordinate axis at an angle of 0 degrees, and the two intact blades have angles of -120 degrees and 120 degrees respectively. Therefore, when the rotor speed is approximately zero and the angles of the three blades are approximately 0 degrees, -120 degrees, and 120 degrees respectively, the wind turbine can be considered to be in equilibrium. It's important to understand that the phase angles in this example are not absolute values ​​and need to be determined based on the actual phase difference angle of each blade. In practical applications, the phase angles of each blade and the rotor speed are continuously monitored. Only when the phase angles of all blades are within a preset range and the rotor has stopped rotating can the turbine be considered in equilibrium. If the phase angle of a blade is outside the preset range or the rotor has not completely stopped rotating, the turbine cannot be considered in equilibrium and monitoring must continue. Based on this, it is easy to determine whether a wind turbine is in a balanced state.

[0091] As a preferred embodiment, after determining that a blade damage fault has been detected in the wind turbine, the method further includes:

[0092] A prompt signal is generated and sent to the prompt module so that the prompt module can issue a prompt.

[0093] To alert staff, this application generates and sends a warning signal to a warning module immediately upon confirmation of blade damage or breakage. Considering wind turbines are typically located in remote, rural areas, the warning module can be a control console terminal within the power plant or a personal terminal for staff. The warning signal is transmitted to the warning module via a wireless communication module installed in the wind turbine or through the wired network of the wind turbine's power infrastructure, ensuring staff are promptly informed of blade damage or breakage. Furthermore, the warning signal may include the wind turbine's serial number and location information to facilitate timely identification of the faulty turbine.

[0094] Please refer to Figure 9 , Figure 9A schematic diagram of a wind turbine protection device for blade damage provided in this application includes:

[0095] Memory 21 is used to store computer programs;

[0096] The processor 22 is used to execute the computer program to implement the steps of the wind turbine protection method after blade damage as described above.

[0097] For a detailed description of the wind turbine protection device after blade damage provided in this application, please refer to the embodiments of the wind turbine protection method after blade damage described above, which will not be repeated here.

[0098] This application also provides a wind turbine generator, including a wind turbine generator body and a wind turbine generator protection device as described above for blade damage.

[0099] The wind turbine body is connected to the wind turbine protection device after the blades are damaged.

[0100] For a detailed description of the wind turbine provided in this application, please refer to the above-described embodiment of the wind turbine protection method after blade damage; further details will not be repeated here.

[0101] This application also provides a computer-readable storage medium storing a computer program, which, when executed by a processor, implements the steps of the wind turbine protection method described above after blade damage.

[0102] For a detailed description of the computer-readable storage medium provided in this application, please refer to the embodiments of the wind turbine protection method after blade damage described above; further details will not be repeated here.

[0103] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on its differences from other embodiments. Similar or identical parts between embodiments can be referred to interchangeably. For the apparatus disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple; relevant parts can be referred to the method section.

[0104] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0105] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A method of protecting a wind turbine after a blade failure, characterized in that, include: When a blade damage fault is detected in the wind turbine, the pitch angle of each blade of the wind turbine is adjusted to the feathering angle at a first preset rate. The generator torque of the wind turbine is reduced by a second preset rate curve, thereby reducing the rotor speed of the wind turbine. Determine whether the wind turbine speed is less than the preset speed within a preset time period, and whether the pitch angle of each blade is a feathering angle. If both are yes, then shut down the generator in the wind turbine and determine whether the wind turbine is in a balanced state; If the wind turbine is in a balanced state, the drive shaft and rotor of the wind turbine are locked to protect the wind turbine. Before adjusting the pitch angle of each blade of the wind turbine to the feathering angle at a first preset rate, the process also includes: Determine the dimensions of each blade of the wind turbine and the current rotor speed of the wind turbine; The first preset rate and the second preset rate curve are determined based on the size of each blade and the current wind turbine rotation speed; The process involves adjusting the pitch angle of each blade of the wind turbine to a feathering angle at a first preset rate, and then reducing the generator torque of the wind turbine at a second preset rate curve.

2. The wind turbine protection method after blade damage as described in claim 1, characterized in that, Before detecting blade damage in the wind turbine, the process also includes: Obtain the various dynamic response parameters of the wind turbine; Each of the dynamic response parameters is multiplied by its corresponding preset weight value to obtain the blade failure judgment factor corresponding to each of the dynamic response parameters. The sum of all the blade failure judgment factors is taken as the blade status value of the wind turbine. Determine whether the blade status value is greater than a preset fault value; If so, it is determined that a blade damage fault has been detected in the wind turbine unit; If not, it is determined that no blade damage fault was detected in the wind turbine unit.

3. The wind turbine protection method after blade damage as described in claim 2, characterized in that, The dynamic response parameters include one or more of the following: the pitch torque of each blade in the wind turbine, the lateral displacement of the nacelle at the top of the wind turbine relative to the windward side of the wind turbine, the lateral acceleration of the nacelle at the top of the wind turbine relative to the windward side of the wind turbine, and the torque at the base of the wind turbine.

4. The wind turbine protection method after blade damage as described in claim 3, characterized in that, Obtaining various dynamic response parameters in the wind turbine, including: Various dynamic response parameters of the wind turbine are obtained by using displacement sensors, acceleration sensors, and force sensors installed in the wind turbine.

5. The wind turbine protection method after blade damage as described in claim 2, characterized in that, After determining that a blade damage fault has been detected in the wind turbine, the process also includes: A prompt signal is generated and sent to the prompt module so that the prompt module can issue a prompt.

6. The wind turbine protection method after blade damage as described in any one of claims 1 to 5, characterized in that, Determining whether the wind turbine is in a balanced state includes: Determine the phase angle of each blade in the wind turbine unit; Determine whether the wind turbine is in a balanced state based on each phase angle and the rotor speed. When the wind turbine speed is zero and the angles of each phase angle are within the preset angle range, it is determined that the wind turbine is in a balanced state and the step of locking the drive shaft and wind turbine of the wind turbine unit is entered. Otherwise, if the wind turbine is not in a balanced state, return to the step of determining whether the wind turbine is in a balanced state based on the phase angles and the rotor speed.

7. A wind turbine protection device for damaged blades, characterized in that, include: Memory, used to store computer programs; A processor, configured to execute the computer program to implement the steps of the wind turbine protection method for blade damage as described in any one of claims 1 to 6.

8. A wind turbine generator set, characterized in that, It includes the wind turbine body and the wind turbine protection device as described in claim 7 after blade damage; The wind turbine body is connected to the wind turbine protection device after the blades are damaged.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores a computer program that, when executed by a processor, implements the steps of the wind turbine protection method for blade damage as described in any one of claims 1 to 6.

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