Abnormal Monitoring Method, Device and Storage Medium for Brake Valve of Wind Turbine

Abstract

The present application discloses a method, device, and storage medium for abnormal monitoring of a brake valve of a wind turbine generator. The method for abnormal monitoring of the brake valve of the wind turbine generator includes: obtaining the pitch speed of the wind turbine generator after pitch start; in response to the pitch speed being less than a first threshold, determining whether the duration of the pitch speed being less than the first threshold exceeds a preset duration; in response to the duration of the pitch speed being less than the first threshold exceeding the preset duration, determining whether the change condition of the pitch speed satisfies the sine change trend condition; and in response to the change condition satisfying the sine change trend condition, determining that the brake valve of the wind turbine generator is abnormal. According to the embodiments of the present application, the problem of low detection accuracy of abnormal conditions of the brake valve in the related art can be solved.

Description

Technical Field

[0001] This application belongs to the technical field of wind turbines, and particularly relates to a method, device, and storage medium for abnormal monitoring of a brake valve of a wind turbine. Background Art

[0002] The brake valve of the pitch system is an important functional module for controlling the blades to maintain a certain blade angle. If the brake valve fails, the blades will rotate under the action of gravity in the direction where the blade angle is greater than 90 degrees, resulting in the blade position exceeding the limit.

[0003] Since the brake valve of the pitch system is not suitable for installing sensors for contact detection, currently, the method for monitoring the abnormal operation of the brake valve of the pitch system is usually to install a proximity switch and monitor the blade angle according to the proximity switch to determine whether the brake valve fails.

[0004] However, this monitoring method can only detect the situation where the brake valve is severely worn. When the braking force of the brake valve is insufficient, the blade position does not exceed the limit, and the proximity switch cannot monitor the abnormality caused by the wear of the brake valve, resulting in low monitoring accuracy. Summary of the Invention

[0005] Embodiments of this application provide a method, device, and storage medium for abnormal monitoring of a brake valve of a wind turbine, which can solve the problem of low accuracy in detecting abnormal conditions of the brake valve in related technologies.

[0006] On the one hand, embodiments of this application provide a method for abnormal monitoring of a brake valve of a wind turbine, and the method includes:

[0007] Obtain the pitch speed of the wind turbine after starting to pitch;

[0008] In response to the pitch speed being less than a first threshold, determine whether the duration for which the pitch speed is less than the first threshold exceeds a preset duration;

[0009] In response to the duration for which the pitch speed is less than the first threshold exceeding the preset duration, determine whether the change situation of the pitch speed satisfies the sine change trend condition;

[0010] In response to the change situation satisfying the sine change trend condition, determine that the brake valve of the wind turbine is abnormal.

[0011] In an optional embodiment, before determining whether the change situation of the pitch speed satisfies the sine change trend condition, the method may further include:

[0012] Detect whether the pitch speed exceeds the first threshold;

[0013] In the case where the pitch speed exceeds the first threshold, start recording the pitch speed;

[0014] When the pitch speed is lower than the first threshold, stop recording the pitch speed and obtain the change situation.

[0015] In an optional implementation, the situation where the change situation after the pitch speed exceeds the first threshold satisfies the sine change trend condition may include:

[0016] The change situation shows a trend that the pitch speed first increases and then decreases.

[0017] In an optional implementation, the situation where the change situation after the pitch speed exceeds the first threshold satisfies the sine change trend condition may also include:

[0018] According to the change situation, determine that the difference between the duration of the increase in the pitch speed and the duration of the decrease in the pitch speed is less than the second threshold.

[0019] In an optional implementation, the method may further include:

[0020] Obtain the impeller speed of the wind turbine generator after starting to pitch;

[0021] Determine the impeller rotation period after starting to pitch according to the impeller speed;

[0022] Responding to the change situation satisfying the sine change trend condition and determining that the brake valve of the wind turbine generator is abnormal may include:

[0023] Responding to the change situation satisfying the sine change trend condition and the duration of the change situation being half of the impeller rotation period, determine that the brake valve of the wind turbine generator is abnormal.

[0024] In an optional implementation, after determining that the brake valve of the wind turbine generator is abnormal, the method may further include:

[0025] Generate an alarm message, which is used to indicate that the brake valve of the wind turbine generator is abnormal;

[0026] Send the alarm message to the alarm device.

[0027] On the other hand, an embodiment of the present application provides a brake valve abnormality monitoring device for a wind turbine generator, and the device includes:

[0028] A first acquisition unit, configured to acquire the pitch speed of the wind turbine generator after starting to pitch;

[0029] A first judgment unit, configured to, in response to the pitch speed being less than the first threshold, judge whether the duration of the pitch speed being less than the first threshold exceeds a preset duration;

[0030] A second determination unit, configured to determine whether the change condition of the pitch speed satisfies the sine change trend condition in response to that the duration of the pitch speed being less than the first threshold exceeds the preset duration;

[0031] A first determination unit, configured to determine that the brake valve of the wind turbine generator is abnormal in response to that the change condition satisfies the sine change trend condition;

[0032] In an optional embodiment, the device may further include:

[0033] A detection unit, configured to detect whether the pitch speed exceeds the first threshold before determining whether the change condition of the pitch speed satisfies the sine change trend condition;

[0034] A recording unit, configured to start recording the pitch speed when the pitch speed exceeds the first threshold; and stop recording the pitch speed when the pitch speed is lower than the first threshold, so as to obtain the change condition.

[0035] In an optional embodiment, the situation that the change condition after the pitch speed exceeds the first threshold satisfies the sine change trend condition may include:

[0036] The change condition shows a trend that the pitch speed first increases and then decreases.

[0037] In an optional embodiment, the situation that the change condition after the pitch speed exceeds the first threshold satisfies the sine change trend condition may further include:

[0038] Determine that the difference between the duration of the pitch speed increase and the duration of the pitch speed decrease is less than the second threshold according to the change condition.

[0039] In an optional embodiment, the device may further include:

[0040] A second acquisition unit, configured to acquire the impeller speed of the wind turbine generator after starting to pitch;

[0041] A second determination unit, configured to determine the impeller rotation period after starting to pitch according to the impeller speed;

[0042] The first determination unit is further configured to determine that the brake valve of the wind turbine generator is abnormal in response to that the change condition satisfies the sine change trend condition and the duration of the change condition is half of the impeller rotation period.

[0043] In an optional embodiment, the device may further include:

[0044] A generation unit, configured to generate an alarm message after determining that the brake valve of the wind turbine generator is abnormal, where the alarm message is used to indicate that the brake valve of the wind turbine generator is abnormal;

[0045] A sending unit, configured to send alarm information to an alarm device.

[0046] In another aspect, an embodiment of the present application provides an electronic device, which includes: a processor and a memory storing computer program instructions;

[0047] When the processor executes the computer program instructions, the abnormal monitoring method of the brake valve of the wind turbine generator set provided by the embodiment of the present application is implemented.

[0048] In another aspect, an embodiment of the present application provides a storage medium, on which computer program instructions are stored, and when the computer program instructions are executed by a processor, the abnormal monitoring method of the brake valve of the wind turbine generator set provided by the embodiment of the present application is implemented.

[0049] In the abnormal monitoring method, device, equipment and storage medium of the brake valve of the wind turbine generator set according to the embodiment of the present application, after pitch control starts, if it is determined that the duration for which the pitch speed is less than the first threshold exceeds a preset duration, then further determine whether the change situation of the pitch speed meets the sine change trend condition. When the change situation conforms to the sine change trend condition, it is determined that the brake valve of the wind turbine generator set is abnormal.

[0050] This is because when the brake valve is abnormal, the blade angle of the wind turbine generator set will change periodically with the rotation of the impeller. When the blade rotates to the position where the direction of gravity is the same as the direction of blade rotation, due to the abnormal brake valve, the pitch speed of the blade will increase. On the contrary, when the blade rotates to the position where the direction of gravity is opposite to the direction of blade rotation, the pitch speed of the blade will decrease. As the impeller rotates, the pitch speed of the blade will show such a cyclic and sinusoidal positive periodic change trend.

[0051] Therefore, through the abnormal monitoring method, device, equipment and storage medium provided by the embodiment of the present application, it is possible to monitor whether the brake valve is abnormal by determining whether the change situation of the pitch speed meets the sine change trend condition. Compared with the proximity switch detection method, it can effectively monitor the situation where the brake valve is not severely worn, thus solving the problem of low detection accuracy of the abnormal situation of the brake valve in the related art and achieving the effect of more accurate monitoring of the abnormal situation of the brake valve. Description of the Drawings

[0052] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following will briefly introduce the drawings required to be used in the embodiments of the present application. For those of ordinary skill in the art, other drawings can also be obtained based on these drawings without creative efforts.

[0053] Figure 1 It is a schematic diagram of the blade angle and the impeller speed in the embodiment of the present application;

[0054] Figure 2 It is a waveform schematic diagram of the blade angle and the impeller speed provided by an embodiment of the present application;

[0055] Figure 3 It is a schematic diagram of the force analysis of the blades of a wind turbine provided by an embodiment of the present application;

[0056] Figure 4 It is a schematic flow diagram of a method for monitoring the abnormality of a brake valve of a wind turbine provided by an embodiment of the present application;

[0057] Figure 5 It is a schematic flow diagram of a method for monitoring the abnormality of a brake valve of a wind turbine provided by another embodiment of the present application;

[0058] Figure 6 It is a schematic structural diagram of a device for monitoring the abnormality of a brake valve of a wind turbine provided by an embodiment of the present application;

[0059] Figure 7 It is a schematic structural diagram of an electronic device provided by an embodiment of the present application. Detailed implementation manners

[0060] The features and exemplary embodiments of various aspects of the present application will be described in detail below. In order to make the purpose, technical solutions and advantages of the present application clearer and more understandable, the present application will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only intended to explain the present application, rather than limiting the present application. For those skilled in the art, the present application can be implemented without some of these specific details. The following description of the embodiments is only to provide a better understanding of the present application by showing examples of the present application.

[0061] It should be noted that, in this article, relational terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the term "comprising", "including" or any other variant thereof is intended to cover a non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not expressly listed, or further includes elements inherent to such process, method, article or device. Without further limitation, the elements defined by the statement "including..." do not exclude the existence of additional identical elements in the process, method, article or device including the said elements.

[0062] To solve the problems of the prior art, the embodiments of the present application provide a method, device, equipment and storage medium for abnormal monitoring of a brake valve of a wind turbine generator. First, the method for abnormal monitoring of the brake valve of the wind turbine generator provided by the embodiments of the present application will be introduced below.

[0063] Figure 1 The flowchart of the method for abnormal monitoring of the brake valve of the wind turbine generator provided by an embodiment of the present application is shown. As Figure 1 shown, three blades (106) of the wind turbine generator are installed on the hub 107. Blade pitch adjustment refers to changing the angle of the blade on the windward side, and the rotation angle is the blade angle 102, which is collected by an encoder. The blade angles of the three blades are respectively collected by the corresponding encoders for the corresponding blades. The impeller speed 101 is the overall rotation of the three blades in the vertical plane, which can also be called the generator speed, and the impeller speed 101 can be collected by a speed sensor.

[0064] The relationship between the blade angle and the impeller speed is as follows: at the same wind speed, the smaller the blade angle, the smaller the angle of attack, the greater the wind force, and the faster the impeller speed; conversely, the larger the blade angle, the smaller the wind force, and the slower the impeller speed.

[0065] As Figure 2 shown, it is a schematic diagram of the waveform curves of the blade angle and the impeller speed. The horizontal axis is time, and the vertical axis is the speed value. Curve 105 is the impeller speed, curve 104 is the pitch-changing speed of the blade with a normal brake valve, and curve 103 is the pitch-changing speed of the blade with an abnormal brake valve.

[0066] From Figure 2 it can be seen that after the normal blade starts to retract the pitch, curve 104 becomes a horizontal straight line with a constant speed, while after the blade with an abnormal brake valve starts to retract the pitch, curve 103 shows several data cycle fluctuations of retracting the pitch, pausing, and then retracting the pitch. The reason is:

[0067] As the impeller rotates, when the blade rotates to a certain angle, the direction of gravity is the same as the direction of blade rotation. Since the solenoid valve of the brake valve is not completely faulty or stuck at this time, the resultant force of gravity and the blade rotation torque can overcome the resistance of the solenoid valve, so the pitch-changing speed will increase; when the blade rotates to another angle, the direction of gravity is opposite to the direction of blade rotation, and the resultant force is not enough to overcome the resistance of the solenoid valve, so the pitch-changing speed will become very slow again, and it changes periodically with the rotation of the impeller. As Figure 2 shown, the interval period between two pitch-changing speed peaks on curve 103 also becomes longer as the impeller speed decreases.

[0068] Figure 3This is a schematic diagram of the force analysis of the blades of a wind turbine provided by an embodiment of the present application. As Figure 3 shown, the mass 204 is the equivalent mass when the blade rotates after being installed on the hub, denoted as m; the sub-mass 205 is the sub-mass of the mass 204 perpendicular to the blade direction; the sub-mass 206 is the sub-mass of the mass 204 parallel to the rotation axis; among them, the mass 204 and the sub-mass 205 are both located in the vertical plane formed by the blades 201, 202, and 203; the first sub-mass is the sub-mass of the sub-mass 205 tangent to the circle where the blade rotates, and the second sub-mass is the sub-mass of the sub-mass 205 perpendicular to the blade axis; among them, the sub-mass 205 is perpendicular to the blade flank surface but not perpendicular to the parallel rotation axis of the mass 204; the first sub-mass is perpendicular to the parallel rotation axis of the mass 204.

[0069] Since the blade shape is an irregular rigid body, its total moment of inertia I can be considered to consist of two parts: the moment of inertia I1 when the equivalent mass m of the blade rotates, and the additional moment of inertia I2 when the blade rotates; according to the formula of the moment of inertia, we can get:

[0070] I1 = m * L 2 Formula (1)

[0071] I2 = First sub-mass * R 2 Formula (2)

[0072] From Figure 3 it can be seen that the magnitude of the sub-mass 205 is equal to the first sub-mass multiplied by sin a. Assuming that the vertical upward position is the 0-degree azimuth angle, then facing the hub, the azimuth angle sensor measures the azimuth angle of the blade 201 as a1, the azimuth angle a2 of the blade 202 is (a1 + 120) modulo 360 degrees, and the azimuth angle a3 of the blade 203 is (a1 - 120) modulo 360 degrees. In Figure 3 since a1 = 0, so a2 = 120 and a3 = 240; then it can be calculated that a = 180 - 120 degrees = 60 degrees.

[0073] When the blade is in the left half-plane of the vertical plane formed by the blades 201, 202, and 203, see Figure 3 the blade 203 in it, and the pitch direction is pitching towards the 0-degree direction, the additional moment of inertia I2 of the blade plays a role in assisting the pitch; when the blade is in the right half-plane of the vertical plane formed by the blades 201, 202, and 203, see Figure 3 the blade 202 in it, and the pitch direction is pitching towards the 180-degree direction, the additional moment of inertia I2 of the blade plays a role in resisting the pitch;

[0074] Therefore, it can be obtained that the magnitude of the additional moment of inertia of the blade is:

[0075] I2 = R2* m * partial mass 204 * sin a * sin b * p * (a - 180) / |(a - 180)| Formula (3)

[0076] Where p represents the pitch direction of the blade. When the blade pitches towards the 0 - degree angle, p = +1; when the blade pitches towards the 180 - degree angle, p = -1.

[0077] Meanwhile, the magnitude of the torque caused by the blade gravity (denoted as N) can be obtained as follows:

[0078] N = m * partial mass 204 * sin a * sin b * p * (a - 180) / |(a - 180)| Formula (4)

[0079] Where the meanings of Formula (3) and Formula (4) are: when the blade is at different azimuth angles, the gravity of the blade will have different effects on the blade opening and closing directions.

[0080] Figure 4 The flowchart of the abnormal monitoring method for the brake valve of a wind turbine generator set provided by an embodiment of the present application is shown. As Figure 4 shown, the method includes the following steps:

[0081] Step 501, obtain the pitch speed of the wind turbine generator set after starting to pitch.

[0082] Starting to pitch can be executed after receiving the pitch demand. The pitch system of the wind turbine generator set is used to execute the pitch of the blade. Pitching can include situations such as closing the blade, opening the blade, and feathering the blade. The pitch speed can be collected by an encoder. In order to judge whether the brake valve is abnormal, the pitch speed after starting to pitch can be obtained.

[0083] Step 502, in response to the pitch speed being less than the first threshold, judge whether the duration for which the pitch speed is less than the first threshold exceeds a preset duration.

[0084] If the pitch speed is less than the first threshold, judge whether the duration for which the pitch speed is less than the first threshold exceeds a preset duration.

[0085] For example, according to Curve 103 as Figure 2 shown, it can be seen that for the blade with an abnormal brake valve, due to several data - cycle fluctuations of closing the blade, pausing, and then closing the blade again, the pitch speed of the blade has a change of remaining close to 0 (pausing) for a period of time, a sine positive - cycle waveform (closing the blade), and then remaining close to 0 for another period of time.

[0086] After the moment t when pitch adjustment starts, the pitch speed of the blade with an abnormal brake valve is close to 0 and will last for a period of time. After exceeding the preset duration, the first fluctuation in the form of a sine positive cycle waveform will appear in the pitch speed. Due to the above reasons, a reasonable duration value can be set as the preset duration according to the historical data obtained by monitoring the pitch speed of the blade with an abnormal brake valve. In this way, after pitch adjustment starts, it is judged whether the duration when the pitch speed is less than the first threshold exceeds the preset duration, and then it is judged whether a fluctuation in the form of a sine positive cycle waveform appears.

[0087] For the blade with a normal brake valve, the pitch speed is stably maintained at a value (such as 2 degrees / second).

[0088] Therefore, according to the above characteristics, the first threshold can be set to be close to 0 and less than the value of the pitch speed of the blade when the brake valve is normal. For example, when the pitch speed of the blade is 2 degrees / second when the brake valve is normal, the first threshold can be set to a value close to 0 and less than 2 degrees / second, such as set to 0.5 degrees / second.

[0089] Step 503, in response to the duration when the pitch speed is less than the first threshold exceeding the preset duration, judge whether the change of the pitch speed satisfies the sine change trend condition.

[0090] After it is determined that the duration when the pitch speed is less than the first threshold exceeds the preset duration, further judge whether the change of the pitch speed satisfies the sine change trend condition. The above change condition is used to indicate that there is an abnormality in the brake valve. The reason is:

[0091] In the case of an abnormal brake valve, as the impeller rotates, when the blade rotates to a certain angle, the direction of gravity is the same as the direction of blade rotation. When the brake valve is not completely faulty or stuck, the resultant force of gravity and the blade rotation torque can overcome the resistance of the solenoid valve. Therefore, the pitch speed will increase; and when the blade rotates to another angle, the direction of gravity is opposite to the direction of blade rotation, and the resultant force is not enough to overcome the resistance of the solenoid valve. Therefore, the pitch speed will become very slow again, showing a sine positive cycle change of increasing first and then decreasing. And as the impeller rotates, it changes periodically.

[0092] Exemplarily, as Figure 2 shown, it shows a schematic waveform curve diagram of the blade angle and the impeller speed. The horizontal axis is time, the vertical axis is the speed value. Curve 105 is the impeller speed, curve 104 is the pitch speed of the blade with a normal brake valve, and curve 103 is the pitch speed of the blade with an abnormal brake valve.

[0093] Curve 103 is used to represent the pitch speed of the blade with a brake valve anomaly. After the pitch speed approaches 0 and persists for a period of time, it begins to gradually increase, then gradually decrease, and approaches 0 again, forming a change curve in the shape of a positive sine period.

[0094] Therefore, it can be determined whether the change of the pitch speed meets the sine change trend condition. If it meets, there is a brake valve anomaly.

[0095] Conversely, if the duration during which the pitch speed is determined to be less than the first threshold does not exceed the preset duration, the pitch speed continues to be monitored until the condition that the duration during which the pitch speed is less than the first threshold exceeds the preset duration is met, and then the determination of whether the change of the pitch speed meets the sine change trend condition is performed.

[0096] In an optional implementation, the change of the pitch speed refers to the curve during the sine change. To record the change of the pitch speed, before determining whether the change of the pitch speed meets the sine change trend condition, the method may further include:

[0097] Step 5031, detecting whether the pitch speed exceeds the first threshold;

[0098] Step 5032, when the pitch speed exceeds the first threshold, start recording the pitch speed;

[0099] Step 5033, when the pitch speed is lower than the first threshold, stop recording the pitch speed to obtain the change situation.

[0100] That is, the recorded change of the pitch speed is the data during the period when the pitch speed is higher than the first threshold, so that the determination of whether the sine change trend condition is met can be made more accurately.

[0101] Step 504, in response to the change situation meeting the sine change trend condition, determining that the brake valve of the wind turbine generator is abnormal.

[0102] If, after determining that the duration during which the pitch speed is less than the first threshold exceeds the preset duration, it is determined that the change situation does not meet the sine change trend condition, it is impossible to determine that there is a brake valve anomaly. Regarding whether the brake valve of the wind turbine generator is abnormal, it can be judged in combination with other solutions, which are not limited and not exemplified in the embodiments of the present application.

[0103] In an optional implementation, the situation where the change of the pitch speed after exceeding the first threshold meets the sine change trend condition may include:

[0104] The change situation shows a trend that the pitch speed first increases and then decreases.

[0105] The trend of first increasing and then decreasing can be determined by comparing the pitch speed at each sampling moment with that at the previous sampling moment to judge the changing directions of increase and decrease of the pitch speed at each moment. After determining the changing directions of the pitch speed at all moments during the period of determining the change situation, it is possible to determine whether there is a trend of first increasing and then decreasing according to the distribution of increase and decrease. Since there may be certain errors in the detected pitch speed, it is allowed to have a certain number of changes in the opposite direction during the process of increasing or decreasing trends.

[0106] In an optional implementation manner, the situation where the change situation after the pitch speed exceeds the first threshold meets the sine change trend condition may further include:

[0107] According to the change situation, it is determined that the difference between the duration of the pitch speed increase and the duration of the pitch speed decrease is less than the second threshold.

[0108] The positive period of the sine is symmetric along the vertical axis, that is, the difference between the duration of increase and the duration of decrease is relatively small. Among them, the second threshold can be an error space set according to historical records.

[0109] The situation where the change situation meets the sine change trend condition may include at least one of the following situations:

[0110] ① The pitch speed of the blade shows the situation of "low speed - gradually increasing speed - gradually decreasing speed" as the azimuth angle of the impeller changes.

[0111] ② The curve of the change situation is symmetric about the vertical axis at the peak moment, and basically symmetric on both the left and right sides; one implementation manner for determination can be to judge whether the pitch speed values at equal time intervals on both the left and right sides of the peak moment are the same (the difference is less than a preset threshold).

[0112] In an optional implementation manner, the method may further include:

[0113] Step 505, obtain the impeller speed of the wind turbine generator set after pitch starts.

[0114] The impeller speed can be detected by a speed sensor. The detected impeller speed can be directly transmitted to the executor of the method provided by the embodiments of the present application, or can be forwarded to the executor of the method provided by the embodiments of the present application via other controllers. The embodiments of the present application do not make any limitations in this regard. The executor of the method provided by the embodiments of the present application can be the controller of the pitch system or the main controller of the wind turbine generator set.

[0115] The method executor provided by the embodiment of the present application can communicate with various sensors such as speed sensors and angle sensors configured in the wind turbine generator to obtain parameters such as speed and angle, so as to obtain the parameters required in the embodiment of the present application; it can also communicate with other controllers in the wind turbine generator to obtain the required parameters. The specific implementation manner can be set according to needs, and the embodiment of the present application does not limit this.

[0116] Step 506, determine the impeller rotation period after pitch change starts according to the impeller rotation speed.

[0117] Step 504, in response to the change situation satisfying the sine change trend condition, determining that the brake valve of the wind turbine generator is abnormal, may include:

[0118] Step 5041, in response to the change situation satisfying the sine change trend condition and the duration of the change situation being half of the impeller rotation period, determine that the brake valve of the wind turbine generator is abnormal.

[0119] The impeller rotation period can be based on the time taken for the impeller to rotate 360 degrees. During the pitch change of the blade, since it is a positive period of sine, the duration during the pitch change of the blade is approximately equal to the time taken for the impeller to rotate 180 degrees.

[0120] Let the impeller rotation speed be n (unit: rpm), which means rotating n revolutions per minute, equivalent to rotating n * 360 degrees per minute. Then the angle rotated per second is a = n * 360 degrees / 60. Let the duration between step 5032 and step 5033 for recording the pitch change speed be T, and calculate whether a * T is 180 degrees. If it is approximately equal to 180 degrees, then determine that the duration of the change situation is half of the impeller rotation period, and thus determine that the brake valve of the wind turbine generator is abnormal.

[0121] In an alternative implementation manner, after step 504 determines that the brake valve of the wind turbine generator is abnormal, the method may further include:

[0122] Step 507, generate an alarm message for indicating that the brake valve of the wind turbine generator is abnormal;

[0123] Step 508, send the alarm message to the alarm device.

[0124] The alarm device can indicate the occurring abnormality and give an alarm so that maintenance personnel can discover and repair it in time. Exemplarily, the alarm device can send alarm messages such as text and pictures through a display screen, or play an alarm sound through a speaker, etc.

[0125] Figure 5 is a schematic flowchart of a method for monitoring the abnormality of the brake valve of a wind turbine generator provided by another embodiment of the present application, as Figure 5As shown, the steps of this method include:

[0126] Step 301, the impeller speed sensor collects the impeller speed value of the wind turbine in real time, and the pitch speed sensor collects the pitch speed value of the wind turbine in real time.

[0127] Step 302, the controller (which can be a pitch controller or a main controller) calculates the impeller speed change cycle time in real time according to the impeller speed value.

[0128] Step 303, after the wind turbine detects the start of feathering, the controller detects whether the pitch speed remains less than 0.5 (degrees / second).

[0129] Step 304, if it remains less than 0.5, the controller starts to judge.

[0130] Step 305, the controller judges whether the pitch speed changes to be greater than 0.5.

[0131] Step 306, if it is greater than 0.5, the controller starts a timer and judges the magnitude and change trend of the pitch speed in real time.

[0132] Step 307, when the controller determines that the pitch speed is less than 0.5 again.

[0133] Step 308, calculate the time taken for the impeller to rotate 180 degrees, which is used as the reference cycle time during the sine change of the pitch speed.

[0134] Step 309, if the duration of the impeller rotating 180 degrees calculated by the controller is close to the duration during the sine change of the pitch speed, and the pitch speed changes sinusoidally, then the change of the pitch speed meets the sine change trend condition, and it is determined that there is an abnormality in the brake valve. Otherwise, there is no abnormality in the brake valve.

[0135] Step 309 is to further detect the speed change curve. The detection method can be: detecting whether the pitch speed values at equal time intervals on the left and right sides corresponding to the peak moment are the same; essentially, it is to judge whether the blade pitch speed shows a situation of "low speed - speed gradually increasing - speed gradually decreasing" as the impeller azimuth angle changes. Therefore, this step can further verify the correctness of the detection of the brake valve abnormality.

[0136] Step 310, the controller outputs an alarm message to the alarm device.

[0137] An embodiment of the present application provides a device for abnormally monitoring a brake valve of a wind turbine generator, which can be used to execute the method for abnormally monitoring a brake valve of a wind turbine generator provided by the embodiment of the present application. For the content not detailed in the device for abnormally monitoring a brake valve of a wind turbine generator provided by the embodiment of the present application, reference can be made to the method for abnormally monitoring a brake valve of a wind turbine generator provided by the embodiment of the present application, which will not be elaborated here.

[0138] Figure 6 is a schematic structural diagram of a device for abnormally monitoring a brake valve of a wind turbine generator provided by an embodiment of the present application, as Figure 6 shown, the device includes a first acquisition unit 401, a first judgment unit 402, a second judgment unit 403, and a first determination unit 404.

[0139] The first acquisition unit 401 is configured to acquire the pitch speed of the wind turbine generator after pitch start;

[0140] The first judgment unit 402 is configured to, in response to the pitch speed being less than a first threshold, judge whether the duration of the pitch speed being less than the first threshold exceeds a preset duration;

[0141] The second judgment unit 403 is configured to, in response to the duration of the pitch speed being less than the first threshold exceeding the preset duration, judge whether the change condition of the pitch speed meets the sine change trend condition;

[0142] The first determination unit 404 is configured to, in response to the change condition meeting the sine change trend condition, determine that the brake valve of the wind turbine generator is abnormal.

[0143] In an optional implementation manner, the device may further include:

[0144] a detection unit, configured to detect whether the pitch speed exceeds the first threshold before judging whether the change condition of the pitch speed meets the sine change trend condition;

[0145] a recording unit, configured to start recording the pitch speed when the pitch speed exceeds the first threshold; and stop recording the pitch speed when the pitch speed is lower than the first threshold, to obtain the change condition.

[0146] In an optional implementation manner, the situation where the change condition after the pitch speed exceeds the first threshold meets the sine change trend condition may include:

[0147] The change condition shows a trend that the pitch speed first increases and then decreases.

[0148] In an optional implementation manner, the situation where the change condition after the pitch speed exceeds the first threshold meets the sine change trend condition may further include:

[0149] Determine that the difference between the duration of the pitch speed increase and the duration of the pitch speed decrease is less than a second threshold according to the change situation.

[0150] In an optional embodiment, the device may further include:

[0151] A second acquisition unit, configured to acquire the rotational speed of the impeller of the wind turbine generator after pitch control starts;

[0152] A second determination unit, configured to determine the rotational period of the impeller after pitch control starts according to the rotational speed of the impeller;

[0153] The first determination unit is further configured to determine that the brake valve of the wind turbine generator is abnormal in response to the change situation satisfying the sine change trend condition and the duration of the change situation being half of the rotational period of the impeller.

[0154] In an optional embodiment, the device may further include:

[0155] A generation unit, configured to generate an alarm message after determining that the brake valve of the wind turbine generator is abnormal, where the alarm message is used to indicate that the brake valve of the wind turbine generator is abnormal;

[0156] A sending unit, configured to send the alarm message to an alarm device.

[0157] For the brake valve abnormality monitoring device of the wind turbine generator in the embodiment of the present application, after pitch control starts, if it is determined that the duration of the pitch speed being less than a first threshold exceeds a preset duration, then further determine whether the change situation of the pitch speed satisfies the sine change trend condition. When the change situation conforms to the sine change trend condition, it is determined that the brake valve of the wind turbine generator is abnormal.

[0158] This is because when the brake valve is abnormal, the blade angle of the wind turbine generator will change periodically with the rotation of the impeller. When the blade rotates to the position where the gravity direction is the same as the blade rotation direction, due to the abnormal brake valve, the pitch speed of the blade will increase. Conversely, when the blade rotates to the position where the gravity direction is opposite to the blade rotation direction, the pitch speed of the blade will decrease. As the impeller rotates, the pitch speed of the blade will show such a cyclic and sinusoidal positive periodic change trend.

[0159] Therefore, through the brake valve abnormality monitoring device of the wind turbine generator provided in the embodiment of the present application, it is possible to monitor whether the brake valve is abnormal by determining whether the change situation of the pitch speed satisfies the sine change trend condition. Compared with the proximity switch detection method, it can effectively monitor the situation where the brake valve is not severely worn, thereby solving the problem of low detection accuracy of brake valve abnormality in the related art and achieving the effect of more accurate monitoring of the brake valve abnormality condition.

[0160] Figure 7 The figure shows a schematic diagram of the hardware structure of the electronic device provided by the embodiment of the present application.

[0161] The electronic device may include a processor 601 and a memory 602 storing computer program instructions.

[0162] Specifically, the above-mentioned processor 601 may include a central processing unit (CPU), or an application specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application.

[0163] The memory 602 may include a mass storage for data or instructions. By way of example and not limitation, the memory 602 may include a hard disk drive (HDD), a floppy disk drive, a flash memory, an optical disc, a magneto-optical disc, a magnetic tape, or a universal serial bus (USB) drive, or a combination of two or more of these. In a suitable case, the memory 602 may include a removable or non-removable (or fixed) medium. In a suitable case, the memory 602 may be internal or external to the integrated gateway disaster recovery device. In a specific embodiment, the memory 602 is a non-volatile solid state memory.

[0164] The memory may include a read only memory (ROM), a random access memory (RAM), a magnetic disk storage media device, an optical storage media device, a flash memory device, an electrical, optical, or other physical / tangible memory storage device. Thus, in general, the memory includes one or more tangible (non-transitory) computer-readable storage media (e.g., memory devices) encoded with software including computer-executable instructions, and when the software is executed (e.g., by one or more processors), it is operable to perform the operations described with reference to the method according to an aspect of the present application.

[0165] The processor 601 reads and executes the computer program instructions stored in the memory 602 to implement any one of the brake valve anomaly monitoring methods of the wind turbine generator set in the above embodiments.

[0166] In one example, the electronic device may further include a communication interface 603 and a bus 610. Among them, as Figure 7 shown, the processor 601, the memory 602, and the communication interface 603 are connected through the bus 610 and complete communication with each other.

[0167] The communication interface 603 is mainly used to implement communication between each module, device, unit, and / or device in the embodiments of the present application.

[0168] The bus 610 includes hardware, software, or both, and couples the components of the online data flow metering device to each other. By way of example and not limitation, the bus may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a HyperTransport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an InfiniBand interconnect, a Low Pin Count (LPC) bus, a memory bus, a MicroChannel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-X) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local (VLB) bus, or other suitable buses or a combination of two or more of these. Where appropriate, the bus 610 may include one or more buses. Although the embodiments of the present application describe and illustrate specific buses, the present application contemplates any suitable bus or interconnect.

[0169] It should be clear that the present application is not limited to the specific configurations and processes described above and illustrated in the figures. For the sake of brevity, detailed descriptions of known methods are omitted here. In the above embodiments, several specific steps are described and illustrated as examples. However, the method process of the present application is not limited to the specific steps described and illustrated, and those skilled in the art can make various changes, modifications, and additions, or change the order between steps after understanding the spirit of the present application.

[0170] It should also be noted that the functional blocks shown in the above structural block diagrams can be implemented as hardware, software, firmware, or a combination thereof. When implemented in hardware, it can be, for example, an electronic circuit, an Application Specific Integrated Circuit (ASIC), appropriate firmware, a plug-in, a functional card, and so on. When implemented in software, the elements of the present application are programs or code segments used to perform the required tasks. The program or code segment can be stored in a machine-readable medium or transmitted via a data signal carried in a carrier wave over a transmission medium or a communication link. A "machine-readable medium" can include any medium that can store or transmit information. Examples of machine-readable media include electronic circuits, semiconductor memory devices, ROM, flash memory, Erasable ROM (EROM), floppy disks, CD-ROMs, optical disks, hard disks, fiber optic media, radio frequency (RF) links, and so on. The code segment can be downloaded via a computer network such as the Internet, an intranet, and so on.

[0171] It also needs to be noted that the exemplary embodiments mentioned in the present application describe some methods or systems based on a series of steps or devices. However, the present application is not limited to the order of the above steps, that is, the steps can be executed in the order mentioned in the embodiments, or different from the order in the embodiments, or several steps can be executed simultaneously.

[0172] As described above with reference to the flowcharts and / or block diagrams of methods, apparatuses (systems), and computer program products according to embodiments of the present application. It should be understood that each block in the flowchart and / or block diagram, and the combination of blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device to produce a machine, such that the instructions executed by the processor of the computer or other programmable data processing device enable the implementation of the functions / actions specified in one or more blocks of the flowchart and / or block diagram. Such a processor can be, but is not limited to, a general-purpose processor, a special-purpose processor, a special application processor, or a field programmable logic circuit. It should also be understood that each block in the block diagram and / or flowchart, and the combination of blocks in the block diagram and / or flowchart, can also be implemented by dedicated hardware that performs the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0173] As described above, the foregoing is only the specific implementation manner of the present application. Those skilled in the art can clearly understand that for the convenience and conciseness of description, the specific working processes of the systems, modules, and units described above can refer to the corresponding processes in the foregoing method embodiments and will not be repeated here. It should be understood that the protection scope of the present application is not limited thereto. Any person skilled in the art within the technical scope disclosed by the present application can easily think of various equivalent modifications or substitutions, and these modifications or substitutions should all be covered within the protection scope of the present application.

Claims

1. A method for abnormal monitoring of a brake valve of a wind turbine generator, characterized in that, Including: Obtain the pitch speed of the wind turbine after starting to pitch; In response to the pitch speed being less than a first threshold, determine whether the duration of the pitch speed being less than the first threshold exceeds a preset duration; In response to the duration of the pitch speed being less than the first threshold exceeding the preset duration, determine whether the change condition of the pitch speed satisfies the sine change trend condition; In response to the change condition satisfying the sine change trend condition, determine that the brake valve of the wind turbine is abnormal; Wherein, when the pitch speed exceeds the first threshold, start recording the pitch speed; when the pitch speed is lower than the first threshold, stop recording the pitch speed to obtain the change condition.

2. The abnormal monitoring method of the brake valve of the wind turbine generator set according to claim 1, characterized in that, Before determining whether the change condition of the pitch speed satisfies the sine change trend condition, the method further includes: Detect whether the pitch speed exceeds the first threshold.

3. The abnormal monitoring method of the brake valve of the wind turbine according to claim 1, characterized in that, The situation where the change condition after the pitch speed exceeds the first threshold satisfies the sine change trend condition includes: The change condition shows a trend that the pitch speed first increases and then decreases.

4. The abnormal monitoring method of the brake valve of the wind turbine generator according to claim 3, characterized in that, The situation where the change condition after the pitch speed exceeds the first threshold satisfies the sine change trend condition further includes: The difference between the duration of the pitch speed increase and the duration of the pitch speed decrease determined according to the change condition is less than a second threshold.

5. The abnormal monitoring method for the brake valve of a wind turbine according to any one of claims 1 to 4, characterized in that, The method further includes: Obtain the impeller speed of the wind turbine after starting to pitch; Determine the impeller rotation period after starting to pitch according to the impeller speed; In response to the change condition satisfying the sine change trend condition, determining that the brake valve of the wind turbine is abnormal includes: In response to the change condition satisfying the sine change trend condition and the duration of the change condition being half of the impeller rotation period, determine that the brake valve of the wind turbine is abnormal.

6. The abnormal monitoring method for the brake valve of a wind turbine according to any one of claims 1 to 4, characterized in that, After determining that the brake valve of the wind turbine is abnormal, the method further includes: Generate an alarm message for indicating that the brake valve of the wind turbine is abnormal; Send the alarm message to the alarm device.

7. A brake valve abnormal monitoring device for a wind turbine generator, characterized in that, Including: A first obtaining unit for obtaining the pitch speed of the wind turbine after starting to pitch; A first judging unit for judging whether the duration of the pitch speed being less than a first threshold exceeds a preset duration in response to the pitch speed being less than the first threshold; A second judging unit for judging whether the change condition of the pitch speed satisfies the sine change trend condition in response to the duration of the pitch speed being less than the first threshold exceeding the preset duration; A first determining unit for determining that the brake valve of the wind turbine is abnormal in response to the change condition satisfying the sine change trend condition; A recording unit for starting to record the pitch speed when the pitch speed exceeds the first threshold; and stopping recording the pitch speed when the pitch speed is lower than the first threshold to obtain the change condition.

8. The abnormal monitoring device for the brake valve of a wind turbine generator set according to claim 7, characterized in that, The device further includes: A detection unit, configured to detect whether the pitch speed exceeds the first threshold before determining whether the change condition of the pitch speed meets the sine change trend condition.

9. The abnormal monitoring device for the brake valve of a wind turbine generator according to claim 7, characterized in that, The situation where the change condition after the pitch speed exceeds the first threshold meets the sine change trend condition includes: The change condition shows a trend that the pitch speed first increases and then decreases.

10. The abnormal monitoring device for the brake valve of a wind turbine generator according to claim 9, characterized in that, The situation where the change condition after the pitch speed exceeds the first threshold meets the sine change trend condition further includes: The difference between the duration during which the pitch speed increases and the duration during which the pitch speed decreases determined according to the change condition is less than the second threshold.

11. The abnormal monitoring device for the brake valve of a wind turbine according to any one of claims 7 to 10, characterized in that, The device further includes: A second acquisition unit, configured to acquire the impeller rotation speed of the wind turbine generator set after the start of pitching; A second determination unit, configured to determine the impeller rotation period after the start of pitching according to the impeller rotation speed; The first determination unit is further configured to, in response to the change condition meeting the sine change trend condition and the duration of the change condition being half of the impeller rotation period, determine that the brake valve of the wind turbine generator set is abnormal.

12. The abnormal monitoring device for the brake valve of a wind turbine generator according to any one of claims 7 to 10, characterized in that, The device further includes: A generation unit, configured to generate an alarm message after determining that the brake valve of the wind turbine generator set is abnormal, where the alarm message is used to indicate that the brake valve of the wind turbine generator set is abnormal; A sending unit, configured to send the alarm message to an alarm device.

13. An electronic device, characterized in that, The electronic device includes: a processor and a memory storing computer program instructions; When the processor executes the computer program instructions, it implements the method for monitoring the abnormality of the brake valve of the wind turbine generator set according to any one of claims 1-6.

14. A storage medium, characterized in that, Computer program instructions are stored on the storage medium, and when the computer program instructions are executed by a processor, they implement the method for monitoring the abnormality of the brake valve of the wind turbine generator set according to any one of claims 1-6.

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