CN114320766A - Method and device for detecting clamping paddle of wind driven generator - Google Patents

Abstract

The present invention provides a method and a device for detecting a stuck propeller for a wind generator. The paddle jam detection method includes: during the pitch change of the wind turbine, monitoring the rotational speed of the impeller of the wind turbine; detecting whether the blades in the impeller of the wind turbine are stuck based on the change of the rotational speed . The paddle jam detection device includes: a rotation speed monitoring unit, which monitors the rotation speed of the impeller of the wind turbine during the pitch change of the wind turbine; and a paddle jam detection unit, which detects the wind turbine based on the change of the rotation speed. Whether the blades in the impeller are stuck. Adopting the stuck propeller detection method and device of the present invention not only simplifies the stuck propeller detection model for wind turbines, but also makes the stuck propeller detection model for wind turbines more accurate, and effectively eliminates the sudden change in torque caused by the The interference caused by the data jump of the speed sensor and the data collected by the speed sensor to the detection result of the stuck propeller.

Description

Propeller stuck detection method and device for wind turbine

technical field

The present application relates to the technical field of wind power generation, and in particular, to a method and device for detecting stuck propellers for wind turbines.

Background technique

The load on the wind turbine is usually related to the blade jam condition in the impeller of the wind turbine. This is because the inconsistency or imbalance of the pitch angles of the three blades of the wind turbine will cause the wind turbine to vibrate and vibrate. The larger the load, the larger the load on the wind turbine will be. The excessive load on the wind turbine will cause the wind turbine to work in a state of partial labor for a long time, reduce the service life of the wind turbine, and even endanger the safety of the wind turbine. Therefore, the accuracy of the detection of stuck propeller conditions becomes more and more important. However, in the prior art, it is not possible to directly judge the blade jamming condition of the wind turbine based on the pitch angle of the blades. The reasons are as follows:

(1) The pitch angle of the blade is collected by the pitch system and transmitted to the main control system (PLC) through DP communication. Therefore, the judgment of the pitch angle of the blade will be affected by the DP communication. For example, if the DP communication occurs If it is interrupted, the value of the pitch angle of the blades received by the main control system will be 0, so the actual pitch angles of the three blades cannot be obtained;

(2) The pitch angle of the blade is the value of the rotary encoder collected by the pitch system. Therefore, when the rotary rotary encoder is subject to electromagnetic interference, line disconnection, or rotary encoder failure, the collected pitch angle The value of may be abnormal;

(3) Although the fault of the driver or the electromagnetic brake relay controlling the brake valve can be judged by the fault word of the driver, the fault word is also transmitted through communication. Therefore, when the communication is abnormal, the collected fault word may be 0 (0 means no fault), even in the case of blade jamming, the fault word of the driver may be 0 because the trigger condition of the fault alarm of the driver is not reached, so the actual pitch of the three blades cannot be obtained. horn.

Therefore, there is an urgent need for a paddle jam detection method and device that can solve the above problems.

SUMMARY OF THE INVENTION

The purpose of the present invention is to provide a method and device for detecting a stuck propeller for a wind turbine.

According to an aspect of the present invention, there is provided a propeller jam detection method for a wind turbine, the propeller jam detection method comprising: monitoring the rotational speed of the impeller of the wind turbine during the pitch change of the wind turbine; based on The change of the rotational speed is used to detect whether the blades in the impeller of the wind generator are stuck.

Preferably, the step of detecting whether the blades in the impeller of the wind generator are stuck based on the change of the rotational speed may include: acquiring the rotational speed of the impeller of the wind generator at multiple consecutive times; The rotational speed difference of the impeller of the wind generator at any two adjacent moments; when the rotational speed difference occurs in a predetermined abnormal condition, it is determined that the blades in the impeller of the wind generator are stuck.

Preferably, the predetermined abnormal condition may include at least one of the following conditions: the rotational speed difference is greater than a predetermined threshold; and the rotational speed difference is greater than the predetermined threshold for a predetermined number of times within a predetermined duration.

Preferably, the predetermined threshold may be 0.1 rpm.

Preferably, the stuck propeller detection method may further include: calculating the ratio of the squares of the rotational speeds of the impeller of the wind turbine at any two adjacent moments; The maximum angular difference between the pitch angles of the blades to determine the degree of unbalance between the blades in the impeller.

According to another aspect of the present invention, there is provided a paddle jam detection device for a wind turbine, the paddle jam detection device comprising: a rotational speed monitoring unit configured to monitor the wind power during the pitch change of the wind turbine The rotational speed of the impeller of the generator; the jamming detection unit is configured to detect whether the blades in the impeller of the wind generator are stuck based on the change of the rotational speed.

Preferably, the stuck propeller detection unit may include: a rotational speed acquisition unit configured to acquire rotational speeds of the impeller of the wind turbine at a plurality of consecutive moments; a rotational speed difference calculation unit configured to calculate the rotational speed of the wind turbine The rotational speed difference of the impeller at any two adjacent moments; the paddle jam determination unit is configured to determine that the blades in the impeller of the wind generator are stuck when a predetermined abnormal condition occurs in the rotational speed difference.

Preferably, the predetermined abnormal condition may include at least one of the following conditions: the rotational speed difference is greater than a predetermined threshold; and the rotational speed difference is greater than the predetermined threshold for a predetermined number of times within a predetermined duration.

Preferably, the predetermined threshold may be 0.1 rpm.

Preferably, the paddle jam detection device may further include: a rotational speed ratio calculation unit, configured to calculate the ratio of the squares of rotational speeds of the impeller of the wind turbine at any two adjacent moments; an unbalance degree determination unit, configured by is configured to estimate a maximum angular difference between the pitch angles of the blades in the impeller according to the ratio of the squares of the rotational speeds to determine the degree of unbalance between the blades in the impeller.

According to another aspect of the present invention, a computer-readable storage medium storing a computer program is provided, and when the computer program is executed by a processor, the aforementioned method for detecting a paddle stick in a wind turbine is implemented. .

According to another aspect of the present invention, there is provided a computer device, the computer device comprising: a processor; a memory storing a computer program, when the computer program is executed by the processor, the aforementioned computer program for wind power is realized. The detection method of the stuck propeller of the generator.

The method and device for stuck propeller detection of wind turbines according to the exemplary embodiments of the present invention not only simplifies the stuck propeller detection model for wind turbines, but also makes the stuck propeller detection model for wind turbines more accurate , and even if the DP communication between the main control system and the pitch system is interrupted or the rotary encoder in the pitch system works abnormally, it can accurately identify whether the wind turbine is stuck. The interference caused by the sudden change of torque and the jump of the data collected by the speed sensor to the detection result of the stuck propeller is eliminated.

Description of drawings

The above-mentioned objects and features of the present invention will become more apparent from the following description in conjunction with the accompanying drawings, wherein:

FIG. 1 is a graph showing the variation of the rotational speed difference of the impeller of the wind turbine when no jamming occurs according to an exemplary embodiment of the present invention;

FIG. 2 is a graph showing the variation of the rotational speed difference of the impeller of the wind turbine when a paddle jam occurs according to an exemplary embodiment of the present invention;

FIG. 3 shows a flowchart of a method for detecting a stuck propeller for a wind turbine according to an exemplary embodiment of the present invention;

FIG. 4 shows a schematic process for detecting a stuck propeller of a wind turbine according to an exemplary embodiment of the present invention;

FIG. 5 shows a schematic process for frequency detection in wind turbine jamming detection according to an exemplary embodiment of the present invention;

FIG. 6 is a graph showing a change in the ratio of the square of the rotational speed of the impeller of the wind turbine when a paddle jam occurs according to an exemplary embodiment of the present invention;

FIG. 7 shows a graph of a case where the retraction speed is slow according to an exemplary embodiment of the present invention;

FIG. 8 shows a graph of a fully jammed paddle condition according to an exemplary embodiment of the present invention;

FIG. 9 is a structural block diagram illustrating a propeller jam detection apparatus for a wind turbine according to an exemplary embodiment of the present invention.

Detailed ways

When the pitch angles of the three blades of the impeller of the wind turbine are inconsistent or unbalanced, the magnitude of the wind effect on the three blades is also different, which will cause the impeller of the wind turbine to generate rotational excitation force during the rotation. , the excitation force acting on the tower foundation will cause the wind turbine to vibrate.

The exciting force formula based on eccentric vibration is:

F=meω ² (1)

In formula (1), F is the exciting force generated by the eccentric block; m is the mass of the eccentric block; e is the eccentric distance of the eccentric block; ω is the rotational angular velocity of the eccentric block. For wind turbines, F can be equivalent to the vibration force generated by the wind turbine; m can be equivalent to the equivalent mass of the rotor of the wind turbine rotating (which is related to the density distribution of the rotating body); e can be etc. The effect is a function of the blade length of the wind turbine; ω can be equivalent to the angular velocity of the rotor of the wind turbine rotating. Since the rotational force of the wind turbine mainly comes from the wind force on the blades of the wind turbine, and the longer the blade is, the larger the wind area (and the greater the deviation caused by it), so e can characterize the wind power of the wind turbine. The unbalance of the three blades.

Based on formula (1), it can also be known that the vibration value (ie, the excitation force) of the wind turbine caused by the unbalance of the pitch angles of the three blades of the wind turbine is not only the same as the vibration value of the three blades of the wind turbine. The difference between the pitch angles (that is, the difference between the largest pitch angle and the smallest pitch angle among the three blades) is proportional to the square of the angular velocity at which the impeller of the wind turbine rotates. Unbalance will make the rotational speed of the blades of the wind turbine change abruptly during the rotation process. In addition, because the pitch angles of the three blades of the wind turbine are inconsistent, the wind effect on the wind turbine is also inconsistent and constantly changing, so the angular speed ω or the rotational speed of the rotor of the wind turbine will also fluctuate.

FIG. 1 shows a graph 100 of the variation of the rotational speed difference of the impeller of the wind turbine when no jamming occurs according to an exemplary embodiment of the present invention.

Referring to Fig. 1, the abscissa in Fig. 1 may indicate each moment of the wind turbine during pitching, and the ordinate in Fig. 1 may indicate the difference in rotational speed of the impeller of the wind turbine at each moment (that is, the rotational speed at the current moment is the same as the rotational speed at the current moment). The difference between the rotational speeds of the adjacent last moment). It can be seen from FIG. 1 that during pitching of the wind turbine, the maximum value of the change in the rotational speed of the impeller of the wind turbine is about 0.032 revolutions per minute (rpm).

As a comparison, FIG. 2 shows a graph 200 of the variation of the rotational speed difference of the impeller of the wind turbine when a paddle jam occurs, according to an exemplary embodiment of the present invention.

Referring to Fig. 2, the abscissa in Fig. 2 may indicate each moment of the wind turbine during pitching, and the ordinate in Fig. 2 may indicate the difference in rotational speed of the impeller of the wind turbine at each moment (that is, the rotational speed at the current moment is the same as the rotational speed at the current moment). The difference between the rotational speeds of the adjacent last moment). It can be seen from FIG. 2 that, during pitching of the wind turbine, since a single blade in the wind turbine is stuck, the angle values of the pitch angles of the three blades in the wind turbine are deviated. From the moment when the abscissa is 4863, the change of the rotational speed of the impeller of the wind turbine suddenly increases, and suddenly increases from 0.1 rpm to 0.84 rpm.

It can be seen that, by detecting the change of the rotational speed of the impeller of the wind generator, it can be accurately identified whether the blade in the impeller of the wind generator has a jamming fault.

Hereinafter, the identification of the above-mentioned propeller jamming fault will be described in detail with reference to FIG. 3 .

FIG. 3 shows a flowchart of a method 300 for detecting a stuck propeller for a wind turbine according to an exemplary embodiment of the present invention. The method 300 may be performed by any terminal processing device including a processor, such as, but not limited to, a main control system of a wind turbine or a controller of its pitch system, or the like.

3, the method 300 may include the following steps:

At step 310, the rotational speed of the impeller of the wind turbine may be monitored during pitching of the wind turbine. The rotational speed of the impeller of the wind turbine can be obtained by a wind speed sensor installed on the wind turbine.

In step 320, it may be detected whether the blades in the impeller of the wind generator are stuck based on the change of the rotational speed of the impeller of the wind generator.

As an example, the rotational speed of the impeller of the wind turbine at multiple consecutive moments can be obtained, the rotational speed difference of the impeller of the wind turbine at any two adjacent moments can be calculated, and when a predetermined abnormal condition occurs in the rotational speed difference, the wind power generation can be determined. The blades in the impeller of the machine are stuck.

In this example, the predetermined abnormal condition may be set such that the rotational speed difference of the impellers of the wind turbine is greater than a predetermined threshold (0.1 rpm as shown in FIG. 2 ). Taking into account the data jump disturbance caused by the sudden change of torque and the jump of the data collected by the rotational speed sensor, in this example, the predetermined abnormal condition can also be set as the occurrence of the impeller of the wind turbine within a predetermined duration period The number of times that the difference in rotational speed of t is greater than a predetermined threshold reaches a predetermined number of times (such as 50 times or 80 times).

It should be noted that although the above shows an example of identifying whether the blades in the impeller of the wind turbine have a jamming fault by detecting the rotational speed difference of the impeller, the present invention is not limited to this.

In addition, although not shown in FIG. 3 , according to an exemplary embodiment of the present invention, in the case where it is determined that the blades in the impeller of the wind turbine are stuck, the blades in the impeller of the wind turbine may be further subjected to different measures. Balance analysis to determine the load that the wind turbine can bear.

As an example, the process 300 may calculate the ratio of the squares of the rotational speeds of the impeller of the wind turbine at any two adjacent instants, and estimate the maximum angle between the pitch angles of the blades in the impeller from the ratio of the squares of the rotational speeds difference to determine the unbalance between the blades in this impeller.

Hereinafter, the identification processing process of the above-mentioned propeller jamming fault will be described in further detail with reference to FIG. 4 and FIG. 5 .

FIG. 4 shows a schematic process 400 for stuck propeller detection of a wind turbine according to an exemplary embodiment of the present invention.

Referring to Figure 4, process 400 may be initiated.

In step 401, the process 400 can read the rotational speed value of the impeller of the wind turbine online, or read the rotational speed value of the impeller of the wind turbine in the fault file.

At step 402, the process 400 may calculate the rotational speed difference of the impeller of the wind turbine at each moment.

In step 403, the process 400 may read the rotational speed difference of the impeller of the wind turbine at the current moment, and assign the rotational speed difference of the impeller of the wind turbine at the next moment as the rotational speed difference of the impeller of the wind turbine at the current moment .

At step 404, the process 400 may determine whether the read rotational speed difference is greater than a predetermined threshold of 0.1.

In step 405, if it is determined in step 404 that the read rotational speed difference is greater than the predetermined threshold 0.1, the process 400 may increase the count value by 1; otherwise, return to step 403 to read the rotational speed difference of the impeller of the wind turbine at the current moment value.

At step 406, process 400 may determine whether the count value is greater than a predetermined number of times for a predetermined duration of time (ie, determine whether the frequency of occurrences of a rotational speed difference greater than a predetermined threshold of 0.1 is a high value).

Considering that the change of the rotational speed of the impeller of the wind turbine is usually a single jump or several jumps with a lower frequency, the wind power generation is caused by the inconsistency or imbalance of the pitch angle of the blades in the impeller of the wind turbine. If the change of the rotational speed of the machine (ie, the rotational speed difference) is too large, it is a continuous and high-frequency change process. Therefore, step 406 can be used to detect the number of times or the frequency that the speed difference is greater than 0.1, so as to eliminate the interference caused by the sudden change of torque and the jump of the data collected by the speed sensor to the detection result of the stuck propeller, and then Improve the accuracy of paddle identification and detection.

Step 407, if it is determined in step 406 that the count value is greater than a predetermined number of times within a predetermined duration, the process 400 may output crew jam information (such as, but not limited to, output a flag about a jam warning), and according to the remaining Variables and data analyze the reason for the stuck paddle; otherwise, end process 400 .

After step 407, process 400 ends.

In addition, considering that the maximum sampling frequency of the main control system is relatively low and does not support advanced algorithms such as Fast Fourier (FFT), that is, it is difficult for the main control system to detect the frequency of the time threshold and the frequency threshold. Here, the following frequency detection methods can be used.

Figure 5 shows a schematic process 500 for frequency detection in wind turbine jamming detection according to an exemplary embodiment of the present invention.

5, process 500 may be initiated.

At step 501, the process 500 may set a timer of 100 ms, and use the on-off of the timer to perform count detection.

In step 502, the process 500 may read the rotational speed difference of the impeller of the wind turbine at the current moment, and assign the rotational speed difference of the impeller of the wind turbine at the next moment as the rotational speed difference of the impeller of the wind turbine at the current moment .

At step 503, the process 500 can determine whether the timer is off within 100 ms.

In step 504, if it is determined in step 503 that the timer is disconnected within 100ms (ie, a rotational speed difference greater than 0.1 is read), the count value of the trigger timer is incremented by 1; otherwise, the timer is re-timed and returned Step 502 reads the rotational speed difference of the impeller of the wind turbine at the current moment.

In step 505, the process 500 can determine whether the count value is greater than a threshold value within 2 seconds (the threshold value can usually be set to 50 times or 80 times), which is mainly used to detect whether there is a sudden change in the rotational speed difference of the impeller of the wind turbine. small changes.

In step 506, if it is determined in step 505 that the count value is greater than the threshold within 2 seconds, the process 500 may output the crew jamming information and analyze the cause of the propeller jam according to the remaining variables and data; otherwise, the process 500 ends.

After step 506, process 500 ends.

Compared with the threshold detection method without the setting of the time window, the frequency detection method shown in FIG. 5 can not only realize the detection of the frequency of the rotation speed change, but also does not need to consume a lot of CPU resources.

Hereinafter, the determination and analysis for the unbalance degree of the blade will be described in detail with reference to FIG. 6 .

FIG. 6 shows a graph 600 of the change in the ratio of the square of the rotational speed of the impeller of the wind turbine when a paddle jam occurs, according to an exemplary embodiment of the present invention.

)。从图6中可看出，该比值随着收桨时间的延长而越来越大，其原因在于：发生卡桨的风力发电机的三个叶片的桨距角之间的角度差值越来越大。图6中比值小于1的部分指示风力发电机的叶轮转速突然变慢；图6中比值大于1的部分指示风力发电机的叶轮转速突然变快。Referring to FIG. 6 , the abscissa in FIG. 6 may indicate various moments of the wind turbine during pitching, and the ordinate in FIG. 6 may indicate the ratio of the square of the rotational speed of the impeller of the wind turbine at each moment (ie,

). It can be seen from Fig. 6 that the ratio increases with the extension of the propeller retraction time. The reason is that the angle difference between the pitch angles of the three blades of the wind turbine where the propeller jam occurs becomes larger and larger. bigger. The part with the ratio less than 1 in FIG. 6 indicates that the speed of the impeller of the wind turbine suddenly slows down; the part with the ratio greater than 1 in FIG. 6 indicates that the speed of the impeller of the wind turbine suddenly becomes faster.

In addition, according to the black curve fitted in FIG. 6 , the degree of unbalance among the three blades in the impeller of the wind turbine can also be obtained. As an example, from the moment when propeller jamming is detected (which corresponds to the moment when the abscissa is 2058 shown in FIG. 6 ), the ratio of the square of the rotational speed of the impeller of the wind turbine is about 1.008 (the circle in FIG. 6 ) shown), since the angle difference e ₀ between the pitch angles of the three blades in the impeller of the wind turbine is about 0.5 degrees under normal conditions, the wind power of the nth cycle can be obtained by the following formula The angular difference between the pitch angles of the three blades in the impeller of the generator:

e _n = e ₀ *1.008 ⁿ (2)

In formula (2), e _n may indicate the angle difference between the pitch angles of the three blades of the impeller of the wind turbine in the nth cycle from the moment when the stick is detected; e ₀ may indicate The angle difference between the pitch angles of the three blades of the impeller of the wind turbine under normal operating conditions (0.5 degrees as described above); n is the number of cycles. That is, multiplying e ₀ by 1.008 for each cycle, the angle difference between the pitch angles of the three blades of the impeller of the wind turbine in the 500th cycle is about 26 degrees (here, each cycle is about 20ms , 500 cycles are about 10 seconds), from which the unbalance of the three blades in the impeller of the wind turbine can be determined.

In addition, according to an embodiment of the present disclosure, the jamming of the propeller may include two situations of "completely jammed propeller" and "low speed of propeller retraction".

FIG. 7 shows a graph 700 for a case of slow retraction speed according to an exemplary embodiment of the present invention.

Referring to FIG. 7 , the abscissa in FIG. 7 may indicate each moment of the wind turbine during pitching, and the ordinate in FIG. 7 may indicate the pitch angle of each blade in the impeller of the wind turbine at each moment. As can be seen from FIG. 7 , the curves 702 and 703 are the changes of the pitch angle of the blades that are normally retracted, and the curve 701 is the changes of the pitch angles of the blades that are stuck. In this example, since the blade corresponding to the curve 701 is stuck and the retracting speed is slow, the angle difference between the pitch angles of the three blades is getting larger and larger, and this jamming may be due to the speed analog The output module is abnormal, the incremental signal of the rotary encoder is abnormal, the brake relay is abnormal, the brake solenoid valve is abnormally opened, or the transmission mechanism of the blade is mechanically stuck.

与1.008接近。FIG. 6 and FIG. 7 are curves drawn according to the same data file, and the time when the abscissa is 5 in FIG. 7 corresponds to the time when the abscissa is 1937 in FIG. 6 . It can be seen from Figure 7 that the angle difference between the pitch angles of the three blades of the wind turbine is about 25 degrees at the moment when the abscissa in Figure 7 is 15, which is close to the 26 degrees calculated above, And the ratio of the angle difference between the pitch angles of the three blades of the wind turbine to the square of the rotational speed at the moment when the abscissa in FIG. 7 is 5

close to 1.008.

By way of comparison, FIG. 8 shows a graph 800 of a fully jammed paddle condition in accordance with an exemplary embodiment of the present invention.

Referring to FIG. 8 , the abscissa in FIG. 8 may indicate each moment of the wind turbine during pitching, and the ordinate in FIG. 8 may indicate the pitch angle of each blade in the impeller of the wind turbine at each moment. It can be seen from FIG. 8 that the curves 802 and 803 are the changes of the pitch angle of the blades that are normally retracted, and the curve 801 is the changes of the pitch angles of the blades that are stuck. In this example, since the blade corresponding to the curve 801 is completely stuck, the curve 801 shown in FIG. 8 does not change slowly over time like the curve 701 shown in FIG. 7 .

FIG. 9 is a structural block diagram illustrating a propeller jam detection apparatus 900 for a wind turbine according to an exemplary embodiment of the present invention.

Referring to FIG. 9 , the paddle jam detection device 900 shown in FIG. 9 may include a rotational speed monitoring unit 910 and a paddle stuck detection unit 920, wherein the rotational speed monitoring unit 910 can monitor the rotational speed of the impeller of the wind turbine during pitching of the wind turbine; The paddle detection unit 920 may detect whether the blades in the impeller of the wind turbine are stuck based on the change of the rotational speed of the impeller of the wind turbine.

As an example, the stuck propeller detection unit 920 may further include a rotational speed acquisition unit, a rotational speed difference calculation unit, and a stuck propeller determination unit (none of which are shown), wherein the rotational speed acquisition unit may acquire the rotational speed of the impeller of the wind turbine at multiple consecutive moments ; The rotational speed difference calculation unit can calculate the rotational speed difference of the impeller of the wind turbine at any two adjacent moments; the stuck paddle determination unit can determine that the blades in the impeller of the wind turbine appear when a predetermined abnormal condition occurs in the rotational speed difference. paddle. In this example, the predetermined abnormal condition may be set as the difference in rotational speed of the impellers of the wind turbine being greater than a predetermined threshold, or may be set as a situation in which the rotational speed difference of the impellers of the wind turbine is greater than the predetermined threshold within a predetermined duration period The number of times reached the predetermined number of times.

In addition, the propeller jam detection device 900 shown in FIG. 9 may further include a rotation speed ratio calculation unit and an unbalance analysis unit (neither are shown), wherein the rotation speed ratio calculation unit may calculate the impeller of the wind turbine at any two The ratio of the squares of the rotational speeds at adjacent moments; the unbalance determination unit may estimate the maximum angle difference between the pitch angles of the blades in the impeller according to the ratio of the squares of the rotational speeds, so as to determine the the imbalance between the blades.

Using the above implementation process, the following technical effects can be achieved:

(1) Since the change of the rotational speed of the impeller of the wind turbine is directly analyzed instead of the vibration acceleration of the wind turbine, the detection method for the stuck propeller of the wind turbine according to the exemplary embodiment of the present invention The method and device do not need to consider the influence of various factors such as tower material, tower stiffness, tower height, nacelle mass, nacelle height, tower foundation stability, balance, etc., thus simplifying the paddle for wind turbines detection model;

(2) The method and device for stuck propeller detection of wind turbines according to the exemplary embodiments of the present invention can make the stuck propeller detection model for wind turbines more accurate, thus further improving the recognition accuracy of stuck propeller detection Spend;

(3) Even in the case that the DP communication between the main control system and the pitch system is interrupted or the rotary encoder in the pitch system works abnormally, the stuck paddle for the wind turbine according to the exemplary embodiment of the present invention The detection method and device can also accurately identify whether the wind turbine is stuck;

(4) Since the detected variables are few and the detected variables do not involve the data in the pitch, the method and device for detecting the pitch jam of the wind turbine according to the exemplary embodiment of the present invention are not affected by the main control system and the variable DP communication interruption between propeller systems will not be affected by abnormal signals (such as rotary encoder, limit development, motor operation data, fault word, status word);

(5) The vibration characteristics of the vibration values caused by different vibration reasons are the same (that is, they are all in the form of sinusoidal fluctuations), which makes the identifiability of judging frequency values (that is, accurately distinguishing the vibration causes) lower, Therefore, compared with the method of detecting the vibration amplitude and obtaining the vibration frequency, the method and device for detecting the stuck propeller of a wind turbine according to the exemplary embodiment of the present invention will be simpler to implement, and the reason for the vibration can be determined. higher recognition;

(6) The change of speed value due to sudden change of torque and abnormal speed sensor is usually a single jump or several jumps with lower frequency, while the speed of the blades in the impeller of the wind turbine is inconsistent or unbalanced. If the change of the speed is too large, it is a continuous and high-frequency change process, so by using the number or frequency of the occurrence of the rotation speed difference greater than 0.1rpm to detect, the wind turbine according to the exemplary embodiment of the present invention is used for wind turbines. The method and device for stuck propeller detection can effectively eliminate the interference caused by the sudden change of torque and the jump of data collected by the rotational speed sensor, etc. to the stuck propeller detection result, thereby further improving the accuracy of the stuck propeller detection;

(7) Compared with the detection method that simply counts by judging the threshold value without the setting of the time window, the method and device for detecting the stuck propeller of the wind turbine according to the exemplary embodiment of the present invention can accurately It can detect the speed of the change of the speed value.

Exemplary embodiments according to the present invention also provide a computer-readable storage medium storing a computer program. The computer-readable storage medium stores a computer program that, when executed by the processor, causes the processor to execute the method for detecting a stuck propeller for a wind turbine according to the present invention. The computer-readable recording medium is any data storage device that can store data read by a computer system. Examples of the computer-readable recording medium include read-only memory, random-access memory, optical disks, magnetic tapes, floppy disks, optical data storage devices, and carrier waves (such as data transmission over the Internet via wired or wireless transmission paths).

There is also provided a computer apparatus according to an exemplary embodiment of the present invention. The computer device includes a processor and memory. Memory is used to store computer programs. The computer program is executed by the processor so that the processor executes the computer program for the paddle stuck detection method for a wind turbine according to the present invention.

Although the application has been shown and described with reference to preferred embodiments, those skilled in the art will appreciate that various modifications and changes can be made to these embodiments without departing from the spirit and scope of the application as defined by the appended claims .

Claims (12)

1. a paddle detection method for wind turbine, is characterized in that, described paddle detection method comprises: During the pitch of the wind turbine, monitoring the rotational speed of the impeller of the wind turbine; Based on the change of the rotational speed, it is detected whether the blades in the impeller of the wind turbine are stuck. 2. The paddle jam detection method according to claim 1, wherein the step of detecting whether a paddle jam occurs in the blades in the impeller of the wind turbine based on the change of the rotational speed comprises: acquiring the rotational speed of the impeller of the wind turbine at multiple consecutive moments; Calculate the rotational speed difference of the impeller of the wind turbine at any two adjacent moments; When a predetermined abnormal condition occurs in the rotational speed difference, it is determined that a blade in the impeller of the wind turbine is stuck. 3. The paddle jam detection method according to claim 2, wherein the predetermined abnormal condition comprises at least one of the following conditions: the speed difference is greater than a predetermined threshold; and The number of occurrences of the rotational speed difference being greater than the predetermined threshold reaches a predetermined number of times within a predetermined duration. 4 . The paddle stuck detection method according to claim 3 , wherein the predetermined threshold is 0.1 rpm. 5 . 5. The paddle jam detection method according to claim 2, wherein the paddle jam detection method further comprises: Calculate the ratio of the square of the rotational speed of the impeller of the wind turbine at any two adjacent moments; The maximum angular difference between the pitch angles of the blades in the impeller is estimated according to the ratio of the squares of the rotational speeds to determine the degree of unbalance between the blades in the impeller. 6. A paddle jam detection device for a wind turbine, wherein the paddle jam detection device comprises: a rotational speed monitoring unit configured to monitor the rotational speed of the impeller of the wind turbine during pitching of the wind turbine; The paddle jam detection unit is configured to detect whether a paddle jam occurs in the blades in the impeller of the wind generator based on the change of the rotational speed. 7. The paddle jam detection device according to claim 6, wherein the paddle jam detection unit comprises: a rotational speed acquiring unit, configured to acquire rotational speeds of the impeller of the wind turbine at a plurality of consecutive moments; a rotational speed difference calculation unit, configured to calculate the rotational speed difference of the impeller of the wind turbine at any two adjacent moments; The paddle jam determination unit is configured to determine that a paddle jam occurs in the blades in the impeller of the wind generator when a predetermined abnormal condition occurs in the rotational speed difference. 8. The paddle jam detection device according to claim 7, wherein the predetermined abnormal condition comprises at least one of the following conditions: the speed difference is greater than a predetermined threshold; and The number of occurrences of the rotational speed difference being greater than the predetermined threshold reaches a predetermined number of times within a predetermined duration. 9 . The paddle jam detection device according to claim 8 , wherein the predetermined threshold is 0.1 rpm. 10 . 10. The paddle jam detection device according to claim 7, wherein the paddle jam detection device further comprises: a rotational speed ratio calculation unit, configured to calculate the ratio of the square of the rotational speed of the impeller of the wind turbine at any two adjacent moments; an unbalance determination unit configured to estimate a maximum angular difference between the pitch angles of the blades in the impeller according to the ratio of the squares of the rotational speeds to determine the unbalance between the blades in the impeller Spend. 11. A computer-readable storage medium storing a computer program, wherein, when the computer program is executed by a processor, the detection of stuck propellers for a wind turbine according to any one of claims 1 to 5 is implemented method. 12. A computing device comprising: processor; The memory stores a computer program, and when the computer program is executed by the processor, the method for detecting a stuck propeller for a wind turbine according to any one of claims 1 to 5 is implemented.

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