A wind turbine fault-tolerant operation method and system when a blade root load measurement fails

Abstract

The application provides a wind turbine fault-tolerant operation method when a blade root load measurement fails, which first generates a blade load replacement algorithm based on a blade load theoretical algorithm, and specifically adjusts a constant value in the blade load theoretical algorithm, wherein the constant value at least includes a proportional coefficient corresponding to an acquisition result of each data acquisition point when participating in operation, that is, when a single strain sensor fails, only the proportional coefficient corresponding to the strain sensor needs to be set to 0, so that the strain measurement value of the strain sensor is not used, and meanwhile, the proportional coefficients of the strain measurement values of the remaining three strain sensors are automatically adjusted to complete the blade load calculation, which can effectively avoid the problem of wind turbine shutdown caused by the abnormality of a single strain sensor, fully utilizes the redundant design of the multiple strain sensors, improves the reliability of the unit, and guarantees the normal operation of the wind turbine. Meanwhile, the application also provides a fault-tolerant operation system applying the wind turbine fault-tolerant operation method when the blade root load measurement fails.

Description

Technical Field

[0001] This invention relates to the field of wind power generation technology, specifically to a fault-tolerant operation method and system for wind turbine generators when blade root load measurement fails. Background Technology

[0002] Blade load measurement systems are devices that have been gradually promoted and applied in wind turbine units in recent years. They are mainly used to calculate the load by measuring the real-time strain at the root of the wind turbine blade, and participate in wind turbine operation strategies such as independent pitch control and rotor inference reduction control.

[0003] The mainstream wind turbine blade load measurement system in the industry uses four strain sensors per blade for measurement, such as... Figure 2 As shown, a typical three-bladed wind turbine has twelve sensors, which is a relatively large number. Furthermore, the data measured by the strain sensors is used in real time for the real-time operation control of the wind turbine, and is a critical and important piece of information related to the safety of the wind turbine.

[0004] Currently, when wind turbines experience abnormal load measurements due to the failure of a sensor in the blade load measurement system, the industry typically handles the situation by shutting down or reducing the operating capacity to ensure turbine safety. While this approach offers high safety, it fails to fully utilize the redundancy design of multi-strain sensor measurements and sacrifices the reliability of the wind turbine, significantly impacting its power generation. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a fault-tolerant operation method and system for wind turbines when blade root load measurement fails. This addresses the technical problem that existing blade load measurement methods fail to fully utilize the redundancy design of multi-strain sensor measurements, sacrifice the reliability of wind turbines, and have a significant impact on wind turbine power generation.

[0006] To achieve the above objectives, the present invention employs the following technical solution:

[0007] A first aspect of the present invention provides a fault-tolerant operation method for a wind turbine generator when blade root load measurement fails, comprising the following steps:

[0008] A blade load substitution algorithm is generated based on the blade load theory algorithm;

[0009] The blade load theory algorithm is used to calculate the theoretical load of the blade using the data collection results of four data collection points at the root of the same blade as input parameters; the blade load substitution algorithm is used to calculate the blade substitution load using the data collection results of any three data collection points at the root of the same blade as input parameters, and the deviation rate between the blade substitution load and the blade theoretical load is less than a set threshold.

[0010] The validity of the data collection results from four data collection points at the root of the same leaf was statistically analyzed, and the following response was made:

[0011] If the data acquisition results from all four data acquisition points are valid, then using the data acquisition results from the four data acquisition points as input parameters, the theoretical load of the blade is calculated based on the blade load theoretical algorithm and sent to the unit's main control system; or

[0012] If the data acquisition result from only one data acquisition point is invalid, then the data acquisition results from the remaining three data acquisition points are used as input parameters. Based on the blade load substitution algorithm, the blade substitution load is calculated and sent to the unit's main control system; or

[0013] If the data collection results from two or more data collection points are invalid, the unit will fail and shut down.

[0014] Optionally, the step of generating a blade load replacement algorithm based on the blade load theory algorithm includes adjusting the fixed values ​​in the blade load theory algorithm, wherein the fixed values ​​include at least the proportional coefficients corresponding to the data acquisition results of each data acquisition point when participating in the calculation.

[0015] Optionally, the blade load theoretical algorithm adopts the following formula:

[0016]

[0017]

[0018] Among them, M flag For the waving moment at the leaf root, M edge The bending moment at the root of the blade. The relationship matrix of flapping bending moment at the blade root is given. The relationship matrix of the oscillation bending moment at the blade root is given by ∈ i (i = 1, 2, 3, 4) represents the data collection results at each data collection point.

[0019] Optionally, the validity of the data collection results from four data collection points at the root of the same leaf includes:

[0020] Based on a comparison between the current data collection result at the same data collection point and the data collection result at the adjacent previous time, the following judgment is made:

[0021] If the absolute value of the difference between the current acquisition result and the acquisition result of the previous adjacent acquisition point at the same data acquisition point exceeds a set range, and the absolute value of the difference between the acquisition results of two adjacent acquisition points in multiple consecutive time periods after the current time exceeds the set range, then the acquisition result of that data acquisition point is determined to be invalid; or

[0022] If the absolute value of the difference between the current acquisition result of the same data acquisition point and the acquisition result of the adjacent previous time does not exceed the set range, the acquisition result of the data acquisition point is determined to be valid.

[0023] Optionally, the comparison between the current acquisition result of the same data acquisition point and its adjacent previous acquisition result further includes the following determination:

[0024] If the absolute value of the difference between the current acquisition result and the acquisition result of the previous adjacent time at the same data acquisition point exceeds the set range, and in multiple consecutive time periods after the current time, there are both cases where the absolute value of the difference between the acquisition results of two adjacent time periods does not exceed the set range and cases where the absolute value of the difference between the acquisition results of two adjacent time periods exceeds the set range, then the acquisition result of that data acquisition point is determined to be invalid.

[0025] A second aspect of the present invention provides a fault-tolerant operation system for wind turbine generators when blade root load measurement fails, comprising:

[0026] The fault-tolerant algorithm module is used to generate blade load replacement algorithms based on blade load theory algorithms;

[0027] The blade load theory algorithm is used to calculate the theoretical load of the blade using the data collection results of four data collection points at the root of the same blade as input parameters; the blade load substitution algorithm is used to calculate the blade substitution load using the data collection results of any three data collection points at the root of the same blade as input parameters, and the deviation rate between the blade substitution load and the blade theoretical load is less than a set threshold.

[0028] The fault-tolerant execution module is used to verify the validity of the data collection results from four data collection points at the root of the same leaf and to respond as follows:

[0029] If the data acquisition results from all four data acquisition points are valid, then using the data acquisition results from the four data acquisition points as input parameters, the theoretical load of the blade is calculated based on the blade load theoretical algorithm and sent to the unit's main control system; or

[0030] If the data acquisition result from only one data acquisition point is invalid, then the data acquisition results from the remaining three data acquisition points are used as input parameters. Based on the blade load substitution algorithm, the blade substitution load is calculated and sent to the unit's main control system; or

[0031] If the data collection results from two or more data collection points are invalid, the unit will fail and shut down.

[0032] Optionally, the fault-tolerant execution module includes a data processing unit, which is used to compare the current acquisition result of the same data acquisition point with the acquisition result of its adjacent previous acquisition point, and make the following determination:

[0033] If the absolute value of the difference between the current acquisition result and the acquisition result of the previous adjacent acquisition point at the same data acquisition point exceeds a set range, and the absolute value of the difference between the acquisition results of two adjacent acquisition points exceeds the set range in multiple consecutive acquisition points after the current time, then the acquisition result of the data acquisition point is determined to be invalid and an invalid prompt instruction is issued. The invalid prompt instruction includes the information of the data acquisition point; or

[0034] If the absolute value of the difference between the current acquisition result and the acquisition result of the previous adjacent acquisition result at the same data acquisition point exceeds a set range, and within several consecutive time intervals after the current time, there are both instances where the absolute value of the difference between the acquisition results of two adjacent time intervals does not exceed the set range and instances where the absolute value of the difference between the acquisition results of two adjacent time intervals exceeds the set range, then the acquisition result of that data acquisition point is determined to be invalid and an alarm command is issued. The alarm command includes information about the data acquisition point; or

[0035] If the absolute value of the difference between the current acquisition result of the same data acquisition point and the acquisition result of the adjacent previous time does not exceed the set range, the acquisition result of the data acquisition point is determined to be valid.

[0036] Optionally, the wind turbine fault-tolerant operation system when the blade root load measurement fails further includes:

[0037] The prompting module is used to provide sound, light, or graphic prompts based on invalid prompting commands issued by the data processing unit.

[0038] Optionally, the wind turbine fault-tolerant operation system when the blade root load measurement fails further includes:

[0039] The alarm module is used to generate an audible / visual alarm response based on the alarm commands issued by the data processing unit.

[0040] As can be seen from the above technical solution, the beneficial effects of the present invention are as follows:

[0041] This invention provides a fault-tolerant operation method for wind turbines when blade root load measurement fails. First, a blade load substitution algorithm is generated based on the blade load theory algorithm. Specifically, the fixed values ​​in the blade load theory algorithm are adjusted. These fixed values ​​include at least the proportional coefficients corresponding to the data acquisition results of each data acquisition point when participating in the calculation. That is, when a strain sensor fails, only the corresponding proportional coefficient needs to be set to 0, so the strain measurement value of that strain sensor is no longer used. Simultaneously, the proportional coefficients of the strain measurement values ​​of the remaining three strain sensors are automatically adjusted to complete the blade load calculation. This effectively avoids wind turbine downtime caused by a single strain sensor malfunction, fully utilizes the redundancy design of multi-strain sensor measurements, improves the reliability of the unit, and ensures the normal operation of the wind turbine. Furthermore, this invention also provides a fault-tolerant operation system that applies this method to wind turbines when blade root load measurement fails. Attached Figure Description

[0042] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the accompanying drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. In all the drawings, similar elements or parts are generally identified by similar reference numerals. In the drawings, the elements or parts are not necessarily drawn to scale.

[0043] Figure 1 A flowchart of a fault-tolerant operation method for a wind turbine when blade root load measurement fails;

[0044] Figure 2 This is a schematic diagram showing the location distribution of the four strain sensors at the blade root. Detailed Implementation

[0045] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0046] A first aspect of the present invention provides a fault-tolerant operation method for a wind turbine generator when blade root load measurement fails, comprising the following steps:

[0047] S1. A blade load substitution algorithm is generated based on the blade load theory algorithm.

[0048] The blade load theory algorithm is used to calculate the blade theoretical load by taking the acquisition results (strain measurement values) of four data acquisition points (i.e. strain sensors) at the same blade root as input parameters; the blade load substitution algorithm is used to calculate the blade substitution load by taking the acquisition results of any three data acquisition points at the same blade root as input parameters, and the deviation rate between the blade substitution load and the blade theoretical load is less than a set threshold.

[0049] S2. Analyze the validity of the data collection results from four data collection points at the root of the same leaf, and respond as follows:

[0050] If the data acquisition results from all four data acquisition points are valid, then using the data acquisition results from the four data acquisition points as input parameters, the theoretical load of the blade is calculated based on the blade load theoretical algorithm and sent to the unit's main control system; or

[0051] If the data acquisition result from only one data acquisition point is invalid, then the data acquisition results from the remaining three data acquisition points are used as input parameters. Based on the blade load substitution algorithm, the blade substitution load is calculated and sent to the unit's main control system; or

[0052] If the data collection results from two or more data collection points are invalid, the unit will fail and shut down.

[0053] Wind turbine generators typically have three blades. For a single blade, the blade load is divided into: flapping moment M. flap , oscillation bending moment M edge The theoretical algorithm for blade load uses the following formula:

[0054]

[0055]

[0056] in, The relationship matrix of flapping bending moments at the blade root; The relationship matrix of the oscillation bending moment at the blade root; ∈ i (i = 1, 2, 3, 4) represent the data acquisition results, i.e., strain measurement values, at each data acquisition point; K j (j = 1, 2, 3...8) are the proportional coefficients corresponding to the data acquisition results of each data acquisition point when participating in the calculation. They are affected by factors such as sensor characteristics and installation location. After the on-site debugging is completed, they are all fixed values ​​and will not change.

[0057] Judging from the installation position of the strain sensors in the blades, they are all installed symmetrically, such as... Figure 2 As shown. The sensors in relative positions can be considered redundant (1-3, 2-4). If one fails, the remaining three sensors can still completely measure the deformation in the blade flapping and oscillation directions. From the load calculation formula, when a certain strain ε fails, only the corresponding proportionality coefficient K needs to be adjusted. j Setting it to 0 will eliminate the need for strain data measured by this sensor; at the same time, the scaling factor of the remaining strain sensors will be automatically adjusted to complete the blade load calculation.

[0058] Specifically, by analyzing the characteristics of load anomalies, it can be found that after a single sensor fails, the strain measured by that sensor changes drastically, leading to errors in the load calculation due to the measurement of strain in that part, resulting in anomalies. Therefore, how to quickly and effectively avoid load calculation anomalies caused by erroneous strain measurements is crucial to ensuring the fault-tolerant operation of wind turbines. Thus, strain sensor failure identification is required, namely, the validity of the data acquisition results from four data acquisition points at the root of the same blade, including:

[0059] Based on a comparison between the current data collection result at the same data collection point and the data collection result at the adjacent previous time, the following judgment is made:

[0060] If the absolute value of the difference between the current acquisition result and the acquisition result of the previous adjacent acquisition point at the same data acquisition point exceeds a set range, and the absolute value of the difference between the acquisition results of two adjacent acquisition points in multiple consecutive time periods after the current time exceeds the set range, then the acquisition result of that data acquisition point is determined to be invalid; or

[0061] If the absolute value of the difference between the current acquisition result of the same data acquisition point and the acquisition result of the adjacent previous time does not exceed the set range, the acquisition result of the data acquisition point is determined to be valid.

[0062] In particular, there is a special case: if the absolute value of the difference between the current acquisition result and the acquisition result of the adjacent previous acquisition result of the same data acquisition point exceeds the set range, and in several consecutive time periods after the current time, there are both cases where the absolute value of the difference between the acquisition results of two adjacent time periods does not exceed the set range and cases where the absolute value of the difference between the acquisition results of two adjacent time periods exceeds the set range, then the acquisition result of the data acquisition point is determined to be invalid. This indicates that the acquisition result of the data acquisition point is experiencing drastic fluctuations, which may be caused by continuous sudden changes in the external environment of the wind farm or by occasional anomalies of the data acquisition point. In other words, the data acquisition point is suspected of failure. In order to ensure the normal operation of the unit, this special case is also regarded as sensor failure.

[0063] In one embodiment, the wind turbine monitors each sensor data ε of the blade load measurement system and employs the following identification steps: Does sensor data ε exist – the strain value ε of the sensor at the previous moment? * If the value is greater than the threshold θ1 (typically 20) and remains so for more than 5 consecutive calculation cycles (the wind turbine PLC is a real-time system, typically set to 10ms per cycle), the sensor is considered to be faulty; or, if sensor data ε – the strain value ε of the sensor at the previous moment – ​​exists, then the sensor is considered to be faulty. * If the value is less than the threshold θ2 (typical value 0.001) and remains so for more than 5 consecutive calculation cycles, the sensor is considered to be faulty.

[0064] This invention also provides a fault-tolerant operation system for wind turbines using the aforementioned method for fault-tolerant operation when blade root load measurement fails, comprising a fault-tolerant algorithm module and a fault-tolerant execution module; the fault-tolerant algorithm module is used to generate a blade load substitution algorithm based on a blade load theory algorithm; wherein, the blade load theory algorithm is used to calculate the theoretical blade load using the acquisition results of four data acquisition points at the same blade root as input parameters; the blade load substitution algorithm is used to calculate the blade substitution load using the acquisition results of any three data acquisition points at the same blade root as input parameters, and the deviation rate between the blade substitution load and the blade theoretical load is less than a set threshold; The fault-tolerant execution module is used to verify the validity of the data acquisition results from four data acquisition points at the root of the same blade and respond as follows: If the data acquisition results from all four data acquisition points are valid, the theoretical load of the blade is calculated based on the blade load theory algorithm using the data acquisition results from the four data acquisition points as input parameters and sent to the unit's main control system; or, if the data acquisition result from only one data acquisition point is invalid, the alternative load of the blade is calculated based on the blade load substitution algorithm using the data acquisition results from the remaining three data acquisition points as input parameters and sent to the unit's main control system; or, if the data acquisition results from two or more data acquisition points are invalid, the unit will shut down due to a fault.

[0065] As a further improvement to the above scheme, the fault-tolerant execution module includes a data processing unit, which is used to compare the acquisition result of the same data acquisition point at the current moment with the acquisition result of the adjacent previous moment, and make the following determination:

[0066] If the absolute value of the difference between the current acquisition result and the acquisition result of the previous adjacent acquisition point at the same data acquisition point exceeds a set range, and the absolute value of the difference between the acquisition results of two adjacent acquisition points exceeds the set range in multiple consecutive acquisition points after the current time, then the acquisition result of the data acquisition point is determined to be invalid and an invalid prompt instruction is issued. The invalid prompt instruction includes the information of the data acquisition point; or

[0067] If the absolute value of the difference between the current acquisition result and the acquisition result of the previous adjacent acquisition result at the same data acquisition point exceeds a set range, and within several consecutive time intervals after the current time, there are both instances where the absolute value of the difference between the acquisition results of two adjacent time intervals does not exceed the set range and instances where the absolute value of the difference between the acquisition results of two adjacent time intervals exceeds the set range, then the acquisition result of that data acquisition point is determined to be invalid and an alarm command is issued. The alarm command includes information about the data acquisition point; or

[0068] If the absolute value of the difference between the current acquisition result of the same data acquisition point and the acquisition result of the adjacent previous time does not exceed the set range, the acquisition result of the data acquisition point is determined to be valid.

[0069] As a further improvement to the above solution, the wind turbine fault-tolerant operation system for blade root load measurement failure further includes a prompting module for providing audible, visual, or graphical prompts based on invalid prompting commands issued by the data processing unit, and an alarm module for providing audible / visual alarm responses based on alarm commands issued by the data processing unit. The prompting module focuses on prompting technicians to confirm the failure of the strain sensor, while the alarm module focuses on prompting technicians to indicate a suspected failure of the strain sensor.

[0070] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered within the scope of the claims and specification of the present invention.

Claims

1. A fault-tolerant operation method for wind turbine units when blade root load measurement fails, characterized in that, Includes the following steps: A blade load substitution algorithm is generated based on the blade load theory algorithm; The blade load theory algorithm is used to calculate the theoretical load of the blade using the data collection results of four data collection points at the root of the same blade as input parameters; the blade load substitution algorithm is used to calculate the blade substitution load using the data collection results of any three data collection points at the root of the same blade as input parameters, and the deviation rate between the blade substitution load and the blade theoretical load is less than a set threshold. The validity of the data collection results from four data collection points at the root of the same leaf was statistically analyzed, and the following response was made: If the data acquisition results from all four data acquisition points are valid, then using the data acquisition results from the four data acquisition points as input parameters, the theoretical load of the blade is calculated based on the blade load theoretical algorithm and sent to the unit's main control system; or If the data acquisition result from only one data acquisition point is invalid, then the data acquisition results from the remaining three data acquisition points are used as input parameters. Based on the blade load substitution algorithm, the blade substitution load is calculated and sent to the unit's main control system; or If the data collection results from two or more data collection points are invalid, the unit will fail and shut down.

2. The method for fault-tolerant operation of a wind turbine when blade root load measurement fails, as described in claim 1, is characterized in that... The blade load replacement algorithm based on the blade load theory algorithm includes adjusting the fixed values ​​in the blade load theory algorithm. The fixed values ​​include at least the proportional coefficients corresponding to the data collection results of each data collection point when participating in the calculation.

3. A fault-tolerant operation method for wind turbine units when blade root load measurement fails, as described in claim 2, characterized in that, The theoretical algorithm for blade load uses the following formula: Among them, M flag For the waving moment at the leaf root, M edge The bending moment at the root of the blade. The relationship matrix of flapping bending moment at the blade root is given. The relationship matrix of the oscillation bending moment at the blade root is given by ∈ i (i = 1, 2, 3, 4) represents the data collection results at each data collection point.

4. A fault-tolerant operation method for wind turbine units when blade root load measurement fails, as described in claim 1, characterized in that, The validity of the data collection results from four data collection points at the root of the same leaf includes: Based on a comparison of the current data collection result at the same data collection point with the data collection result at the adjacent previous time, the following judgment is made: If the absolute value of the difference between the current acquisition result and the acquisition result of the previous adjacent acquisition point at the same data acquisition point exceeds a set range, and the absolute value of the difference between the acquisition results of two adjacent acquisition points in multiple consecutive time periods after the current time exceeds the set range, then the acquisition result of that data acquisition point is determined to be invalid; or If the absolute value of the difference between the current acquisition result of the same data acquisition point and the acquisition result of the adjacent previous time does not exceed the set range, the acquisition result of the data acquisition point is determined to be valid.

5. A fault-tolerant operation method for wind turbine units when blade root load measurement fails, as described in claim 4, characterized in that, The comparison between the current acquisition result of the same data acquisition point and its adjacent previous acquisition result also includes the following determination: If the absolute value of the difference between the current acquisition result and the acquisition result of the previous adjacent time at the same data acquisition point exceeds the set range, and in multiple consecutive time periods after the current time, there are both cases where the absolute value of the difference between the acquisition results of two adjacent time periods does not exceed the set range and cases where the absolute value of the difference between the acquisition results of two adjacent time periods exceeds the set range, then the acquisition result of that data acquisition point is determined to be invalid.

6. A fault-tolerant operation system for wind turbine generators when blade root load measurement fails, characterized in that, include: The fault-tolerant algorithm module is used to generate blade load replacement algorithms based on blade load theory algorithms; The blade load theory algorithm is used to calculate the theoretical load of the blade using the data collection results of four data collection points at the root of the same blade as input parameters; the blade load substitution algorithm is used to calculate the blade substitution load using the data collection results of any three data collection points at the root of the same blade as input parameters, and the deviation rate between the blade substitution load and the blade theoretical load is less than a set threshold. The fault-tolerant execution module is used to verify the validity of the data collection results from four data collection points at the root of the same leaf and to respond as follows: If the data acquisition results from all four data acquisition points are valid, then using the data acquisition results from the four data acquisition points as input parameters, the theoretical load of the blade is calculated based on the blade load theoretical algorithm and sent to the unit's main control system; or If the data acquisition result from only one data acquisition point is invalid, then the data acquisition results from the remaining three data acquisition points are used as input parameters. Based on the blade load substitution algorithm, the blade substitution load is calculated and sent to the unit's main control system; or If the data collection results from two or more data collection points are invalid, the unit will fail and shut down.

7. A fault-tolerant operation system for wind turbine generators when blade root load measurement fails, as described in claim 6, is characterized in that... The fault-tolerant execution module includes a data processing unit, which compares the current acquisition result of the same data acquisition point with the acquisition result of its adjacent previous acquisition point, and makes the following determination: If the absolute value of the difference between the current acquisition result of the same data acquisition point and the acquisition result of the adjacent previous time exceeds the set range, and the absolute value of the difference between the acquisition results of two adjacent time points exceeds the set range in multiple consecutive time points after the current time, then the acquisition result of the data acquisition point is determined to be invalid and an invalid prompt instruction is issued. The invalid prompt instruction includes the information of the data acquisition point. or If the absolute value of the difference between the current acquisition result of the same data acquisition point and the acquisition result of the adjacent previous time exceeds the set range, and in multiple consecutive times after the current time, there are both cases where the absolute value of the difference between the acquisition results of two adjacent times does not exceed the set range and cases where the absolute value of the difference between the acquisition results of two adjacent times exceeds the set range, then the acquisition result of the data acquisition point is determined to be invalid and an alarm command is issued. The alarm command includes the information of the data acquisition point. or If the absolute value of the difference between the current acquisition result of the same data acquisition point and the acquisition result of the adjacent previous time does not exceed the set range, the acquisition result of the data acquisition point is determined to be valid.

8. A fault-tolerant operation system for wind turbine generators when blade root load measurement fails, as described in claim 7, is characterized in that... Also includes: The prompting module is used to provide sound, light, or graphic prompts based on invalid prompting commands issued by the data processing unit.

9. A fault-tolerant operation system for wind turbine generators when blade root load measurement fails, as described in claim 7, characterized in that, Also includes: The alarm module is used to generate an audible / visual alarm response based on the alarm commands issued by the data processing unit.

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