Wind turbine blade pitch angle measurement system, method, device, apparatus, and medium

Abstract

The application discloses a wind turbine impeller rotating speed measurement system, method, device, equipment and medium, and belongs to the field of wind power. The wind turbine impeller rotating speed measurement system comprises a low-speed shaft turntable, a plurality of detection holes are uniformly distributed on the low-speed shaft turntable in the circumferential direction, and a blocking block extending in the circumferential direction is arranged on the edge of the low-speed shaft turntable; a first proximity switch is arranged opposite to the disc surface of the low-speed shaft turntable and is used for sensing the detection holes; a second proximity switch is arranged opposite to the edge of the low-speed shaft turntable and is used for sensing the blocking block; and a control unit is used for collecting a first trigger signal of the first proximity switch and a second trigger signal of the second proximity switch in a preset time period during rotation of the low-speed shaft turntable, obtaining a first rotating speed and a second rotating speed according to the first trigger signal, the total number of the detection holes, the second trigger signal and an arc parameter of the blocking block, and determining the impeller rotating speed according to the first rotating speed and the second rotating speed. According to the embodiment of the application, the measurement accuracy of the impeller rotating speed can be improved.

Description

Technical Field

[0001] This application pertains to the field of wind power, and particularly relates to a system, method, apparatus, equipment, and medium for measuring the rotor speed of a wind turbine. Background Technology

[0002] A wind turbine is a device that converts wind energy into electrical energy. To maximize the conversion of wind energy into electricity, the maximum potential output of the wind turbine can be calculated based on the rotor speed. Furthermore, the rotor speed is closely related to the safety of the wind turbine; for example, exceeding the safe speed threshold may lead to risks such as overspeeding and runaway. Therefore, rotor speed is one of the most crucial parameters in the operation and control of wind turbines.

[0003] Currently, impeller speed can be measured using pulse technology, which calculates the impeller speed based on the number of times the sensor switch is triggered per unit time. However, at lower impeller speeds, the sensor switch may be triggered fewer times than it should theoretically be, leading to a deviation in the calculated impeller speed and a decrease in accuracy. Summary of the Invention

[0004] This application provides a wind turbine impeller speed measurement system, method, device, equipment, and medium, which can improve the measurement accuracy of impeller speed.

[0005] In a first aspect, embodiments of this application provide a wind turbine rotor speed measurement system, comprising: a low-speed shaft turntable, wherein a plurality of detection holes are uniformly distributed circumferentially on the low-speed shaft turntable, and at least one circumferentially extending stop is provided on the edge of the low-speed shaft turntable; a first proximity switch, disposed opposite to the surface of the low-speed shaft turntable, and configured as a sensing detection hole; a second proximity switch, disposed opposite to the edge of the low-speed shaft turntable, and configured as a sensing stop; and a control unit, configured to collect a first trigger signal of the first proximity switch and a second trigger signal of the second proximity switch within a preset time period during the rotation of the low-speed shaft turntable, obtain a first speed and a second speed based on the first trigger signal, the total number of detection holes, the second trigger signal, and the arc parameter of the stop, and determine the rotor speed based on the first speed and the second speed.

[0006] In some possible embodiments, the fan-shaped area formed by the stop and the center of the low-speed shaft turntable overlaps with at least two detection holes.

[0007] In some possible embodiments, the control unit is specifically configured to: obtain the number of times the first proximity switch is triggered based on the first trigger signal; and obtain the first rotational speed using the number of times the first proximity switch is triggered, the total number of triggers, and a preset time period.

[0008] In some possible embodiments, the control unit is specifically configured to: obtain the trigger duration of the second proximity switch being triggered based on the second trigger signal; and obtain the second rotational speed using the trigger duration and arc parameters.

[0009] In some possible embodiments, the control unit is specifically used to: process the first speed and the second speed using a weighted algorithm to obtain the impeller speed.

[0010] In some possible embodiments, the control unit is also configured to: determine whether the first proximity switch and the second proximity switch are abnormal based on the number of times the first rotational speed is obtained, the second trigger signal, and the first trigger signal.

[0011] In some possible embodiments, the control unit is specifically configured to: determine that the second proximity switch is abnormal when the number of times the first rotational speed is greater than 1 and no trigger edge appears in the second trigger signal; and determine that the first proximity switch is abnormal when a trigger edge and an end edge exist in the second trigger signal and no trigger level exists in the first trigger signal.

[0012] In some possible embodiments, the control unit is further configured to: determine the second rotational speed as the impeller rotational speed if the first proximity switch malfunctions; and determine the first rotational speed as the impeller rotational speed if the second proximity switch malfunctions.

[0013] Secondly, embodiments of this application provide a wind turbine generator set, including: a rotor speed measurement system for the wind turbine generator set according to the first aspect; and a low-speed shaft connected to a low-speed shaft turntable in the rotor speed measurement system.

[0014] Thirdly, embodiments of this application provide a method for measuring the rotor speed of a wind turbine, applied to the rotor speed measurement system of the wind turbine in the first aspect. The method includes: during the rotation of the low-speed shaft turntable, acquiring a first trigger signal of a first proximity switch and a second trigger signal of a second proximity switch within a preset time period; obtaining a first speed and a second speed based on the first trigger signal, the total number of detection holes, the second trigger signal, and the arc parameters of the stop; and determining the rotor speed based on the first speed and the second speed.

[0015] Fourthly, embodiments of this application provide a wind turbine rotor speed measuring device, applied to the wind turbine rotor speed measuring system of the first aspect. The device includes: a data acquisition module, used to acquire a first trigger signal of a first proximity switch and a second trigger signal of a second proximity switch within a preset time period during the rotation of the low-speed shaft turntable; an intermediate speed determination module, used to obtain a first speed and a second speed based on the first trigger signal, the total number of detection holes, the second trigger signal, and the arc parameters of the stop; and a rotor speed determination module, used to determine the rotor speed based on the first speed and the second speed.

[0016] Fifthly, embodiments of this application provide a control device, including: a processor and a memory storing computer program instructions; when the processor executes the computer program instructions, it implements the wind turbine rotor speed measurement method as described in the third aspect.

[0017] In a sixth aspect, embodiments of this application provide a computer-readable storage medium storing computer program instructions, which, when executed by a processor, implement the wind turbine rotor speed measurement method of the third aspect.

[0018] This application provides a wind turbine rotor speed measurement system, method, apparatus, device, and medium. The wind turbine rotor speed measurement system includes a low-speed shaft turntable, a first proximity switch, a second proximity switch, and a control unit. Multiple detection holes are evenly distributed circumferentially on the low-speed shaft turntable, and circumferentially extending stops are provided at the edge of the low-speed shaft turntable. The first proximity switch senses the detection holes, and the second proximity switch senses the stops. The control unit can obtain a first speed and a second speed based on a first trigger signal generated by the first proximity switch triggered by the detection hole, a second trigger signal generated by the second proximity switch triggered by the stops, the total number of detection holes, and the arc parameters of the stops. The rotor speed is determined by combining the first speed obtained from the first trigger signal and the second speed obtained from the second trigger signal. The first and second speeds can be complementary in calculation method and timing, resulting in higher accuracy of the rotor speed measurement. Attached Figure Description

[0019] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments of this application will be briefly introduced below. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0020] Figure 1 This is a schematic diagram of an example of a proximity switch sensing a detection orifice over a period of time;

[0021] Figure 2 This is a schematic diagram of another example of a proximity switch sensing a detection orifice over a period of time;

[0022] Figure 3 This is a schematic diagram illustrating an example of impeller speed obtained using current impeller speed measurement methods.

[0023] Figure 4 This is a schematic diagram of another example of impeller speed obtained using current impeller speed measurement methods;

[0024] Figure 5This is a schematic diagram of the structure of a wind turbine rotor speed measurement system provided in an embodiment of this application;

[0025] Figure 6 This is a schematic diagram of an example of a low-speed shaft turntable, a first proximity switch, and a second proximity switch provided in an embodiment of this application.

[0026] Figure 7 A flowchart illustrating a method for measuring the impeller speed of a wind turbine generator according to an embodiment of this application;

[0027] Figure 8 A flowchart illustrating an example of the impeller speed measurement process for a wind turbine provided in this application embodiment;

[0028] Figure 9 This is a schematic diagram of the structure of a wind turbine rotor speed measuring device provided in an embodiment of this application;

[0029] Figure 10 This is a schematic diagram of the structure of a control device provided in an embodiment of this application. Detailed Implementation

[0030] The features and exemplary embodiments of various aspects of this application will be described in detail below. To make the objectives, technical solutions, and advantages of this application clearer, the 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 this application and not to limit it. For those skilled in the art, this application can be implemented without some of these specific details. The following description of the embodiments is merely to provide a better understanding of this application by illustrating examples.

[0031] A wind turbine is a device that converts wind energy into electrical energy. To maximize the conversion of wind energy into electricity, the maximum potential output of the wind turbine can be calculated based on the rotor speed. Furthermore, the rotor speed is closely related to the safety of the wind turbine; for example, exceeding the safe speed threshold may lead to risks such as overspeeding and runaway. Therefore, rotor speed is a crucial parameter in the operation and control of wind turbines. Currently, rotor speed can be measured using pulse technology, which calculates the rotor speed based on the number of times a sensor switch is triggered per unit time. However, at lower rotor speeds, the number of times the sensor switch is triggered will be less than the theoretically expected number, resulting in a deviation in the calculated rotor speed and a decrease in accuracy.

[0032] For example, Figure 1 This is a schematic diagram illustrating an example of a proximity switch sensing a detection orifice over a period of time, as shown below. Figure 1As shown, multiple detection holes are evenly arranged circumferentially on the low-speed shaft turntable 11 of the wind turbine. When the proximity switch 12 is opposite to the detection hole, it can sense the detection hole and thus be triggered. Figure 1 The detection holes 111a and 111b on the low-speed shaft turntable 11 on the left side are positioned as follows after the low-speed shaft turntable 11 is rotated counterclockwise. Figure 1 As shown in the detection holes 111a and 111b on the low-speed shaft turntable 11 on the right side, during this process, three detection holes pass through the proximity switch 12, which is triggered three times. However, the low-speed shaft turntable 11 actually only rotates by the angle corresponding to two detection holes. If the impeller speed is calculated based on the proximity switch 12 being triggered three times, the calculated impeller speed will be higher than the actual impeller speed, resulting in lower measurement accuracy of the impeller speed.

[0033] For example, Figure 2 This is a schematic diagram of another example of a proximity switch sensing a detection orifice over a period of time, as shown below. Figure 2 As shown, multiple detection holes are evenly arranged circumferentially on the low-speed shaft turntable 11 of the wind turbine. When the proximity switch 12 is opposite to the detection hole, it can sense the detection hole and thus be triggered. Figure 2 The detection holes 111c and 111d on the low-speed shaft turntable 11 on the left side, after being rotated counterclockwise by the low-speed shaft turntable 11, will be positioned as follows: Figure 2 As shown in the detection holes 111c and 111d on the low-speed shaft turntable 11 on the right side, during this process, one detection hole passes through the proximity switch 12, which is triggered once. However, the low-speed shaft turntable 11 actually rotates by the angles corresponding to both detection holes. If the impeller speed is calculated based on the proximity switch 12 being triggered once, the calculated impeller speed will be lower than the actual impeller speed, resulting in low accuracy in impeller speed measurement.

[0034] according to Figure 1 and Figure 2 As can be seen, the current methods for measuring impeller speed have low accuracy, leading to significant fluctuations in the measured impeller speed. For example, Figure 3 This is a schematic diagram illustrating an example of impeller speed measurement using current methods. It shows the impeller speed obtained at a relatively high speed using these methods. Figure 3 It can be seen that the impeller speed measured using the current method exhibits relatively high frequency fluctuations. At higher impeller speeds, the maximum fluctuation range using the current method reaches 0.4 revolutions per minute (0.4 rpm). For example, Figure 4This is a schematic diagram illustrating another example of impeller speed obtained using current impeller speed measurement methods. It shows the impeller speed obtained using current methods at a relatively low impeller speed. Figure 4 As shown, when the impeller speed is relatively low, the maximum fluctuation in impeller speed obtained using the current impeller speed measurement method reaches 1 rpm. Figure 3 and Figure 4 It can be seen that the current method of measuring impeller speed has low accuracy and large fluctuations, which will have an adverse effect on the control of wind turbine units.

[0035] To improve the measurement accuracy of impeller speed, increasing the number of measuring holes on the low-speed shaft disc could be considered. However, the size of the low-speed shaft disc is limited, making it nearly impossible to double the number of measuring holes. If multiple proximity switch sensing holes are used, the aforementioned accuracy issues will persist due to the identical installation and detection characteristics of each proximity switch. Even with multiple sensing holes, it's difficult to improve the accuracy of impeller speed measurement. Filtering the signal obtained from the proximity switch sensing holes only ensures that the impeller speed no longer exhibits a sinusoidal change, guaranteeing a relatively stable impeller speed, but it cannot guarantee the accuracy of the impeller speed measurement.

[0036] This application provides a system, method, apparatus, equipment, and medium for measuring the rotor speed of a wind turbine. In addition to a detection hole on the low-speed shaft turntable, a stop block is also set on the edge of the low-speed shaft turntable. A first proximity switch for the detection hole and a second proximity switch for the stop block are correspondingly set. The rotor speed is obtained by combining the speed measured by the first proximity switch and the speed measured by the second proximity switch. Because the stop block has a certain length, the speed obtained through the stop block and the speed obtained through the detection hole can complement each other in timing, thereby obtaining a more accurate rotor speed and improving the precision of rotor speed measurement.

[0037] The impeller speed measurement system, method, device, equipment and medium of the wind turbine provided in this application will be described below.

[0038] The first aspect of this application provides a wind turbine impeller speed measurement system. Figure 5 This is a schematic diagram of the structure of a wind turbine rotor speed measurement system provided in an embodiment of this application, as shown below. Figure 5 As shown, the rotor speed measurement system of the wind turbine may include a low-speed shaft turntable 21, a first proximity switch 22, a second proximity switch 23, and a control unit 24.

[0039] The low-speed shaft turntable 21 is connected to the low-speed shaft 31. Multiple detection holes 211 are evenly distributed along the circumference on the low-speed shaft turntable 21, and at least one stop 212 extending along the circumference is provided on the edge of the low-speed shaft turntable 21. The number of stop blocks 212 can be set according to requirements. Figure 6 This is a schematic diagram illustrating an example of a low-speed shaft turntable, a first proximity switch, and a second proximity switch provided in an embodiment of this application, as shown below. Figure 6 As shown, the first proximity switch 22 is positioned opposite the surface of the low-speed shaft turntable 21. During the rotation of the low-speed shaft turntable 21, the first proximity switch 22 can rotate relative to the detection hole 211. The first proximity switch 22 is configured to sense the detection hole 211. When the first proximity switch 22 is opposite to the detection hole, it is triggered. When the first proximity switch 22 is triggered, it can send a corresponding signal to the control unit 24. For example, when the first proximity switch 22 is not triggered, it can emit a low-level signal; when the first proximity switch 22 is triggered, it can emit a high-level signal. The second proximity switch 23 is positioned opposite the edge of the low-speed shaft turntable 21. During the rotation of the low-speed shaft turntable 21, the second proximity switch 23 can rotate relative to the stop block 212. The second proximity switch 23 is configured to sense the stop block 212. When the second proximity switch 23 is opposite to the stop block 212, it is triggered. When the second proximity switch 23 is not triggered, it can send a corresponding signal to the control unit 24. For example, when the second proximity switch 23 is not triggered, it can emit a low-level signal; when triggered, it can emit a high-level signal. The stop block 212 has a certain length, which can be set according to the scenario and requirements, and is not limited here. For example, the length of the stop block 213 can be greater than the diameter of the detection hole 211, and the triggering time of the second proximity switch 23 will be longer than the triggering time of the first proximity switch 22. In some examples, the sector formed by the stop block 212 and the center of the low-speed shaft turntable 21 overlaps with at least two detection holes 211. This overlap can include partial or complete overlap between the sector and the detection holes 211. Figure 6 The sector shown overlaps with two detection holes 211, and the sector partially overlaps with one of the detection holes 211 and completely overlaps with the other detection hole 211.

[0040] The control unit 24 can be connected to the first proximity switch 22 and the second proximity switch 23 to receive signals sent by the first proximity switch 22 and the second proximity switch 23. During the rotation of the low-speed shaft turntable 21, the control unit 24 can collect the first trigger signal of the first proximity switch 22 and the second trigger signal of the second proximity switch 23 within a preset time period. Based on the first trigger signal, the total number of detection holes 211, the second trigger signal, and the arc parameter of the stop block 212, the control unit 24 obtains the first rotational speed and the second rotational speed, and determines the impeller rotational speed based on the first rotational speed and the second rotational speed.

[0041] The preset time period can be set according to the scenario, requirements, experience, etc., and is not limited here. The low-speed axis turntable rotates within the preset time period. The first proximity switch 22 can sense one or more detection holes 211, and the second proximity switch 23 can sense the stop 212. The control unit 24 can collect the first trigger signal and the second trigger signal from the first proximity switch 22 and the second proximity switch 23. The scanning period of the control unit 24 for the first and second trigger signals can be set according to the scenario, requirements, experience, etc., and is not limited here. For example, the scanning period can be 1ms or 5ms. The scanning period can be set first. After the first proximity switch is triggered for the first time in a rotational speed measurement, the detection flag is set. The setting of the detection flag indicates the start of the rotational speed measurement. The first trigger signal is the signal emitted by the first proximity switch 22 when triggered, and the second trigger signal is the signal emitted by the second proximity switch 23 when triggered. The first trigger signal can represent the number of times the first proximity switch is triggered. The second trigger signal can represent the trigger duration of the second proximity switch. Specifically, the control unit 24 can obtain a first rotational speed based on the total number of detection holes 211 and a first trigger signal within a preset time period. The first rotational speed includes the rotational speed obtained by sensing the detection holes 211 through the first proximity switch 22. The control unit 24 can obtain a second rotational speed based on a second trigger signal and the arc parameters of the stop block. The second rotational speed includes the rotational speed obtained by sensing the stop block 212 through the second proximity switch 23. The arc parameters of the stop block 212 can reflect the length of the stop block. For example, the arc parameters of the stop block 212 may include, but are not limited to, the arc length of the stop block 212, the angle of the stop block 212 (i.e., the central angle corresponding to the stop block 212), etc. The calculation methods of the first rotational speed and the second rotational speed are different. The first rotational speed and the second rotational speed are complementary in measurement and timing. The accuracy of the impeller rotational speed determined by combining the first rotational speed and the second rotational speed will be further improved.

[0042] In this embodiment, the wind turbine rotor speed measurement system includes a low-speed shaft turntable 21, a first proximity switch 22, a second proximity switch 23, and a control unit 24. Multiple detection holes 211 are evenly distributed circumferentially on the low-speed shaft turntable 21, and circumferentially extending stops 212 are provided at the edge of the low-speed shaft turntable 21. The first proximity switch 22 senses the detection holes 211, and the second proximity switch 23 senses the stops 212. The control unit 24 can obtain a first speed and a second speed based on a first trigger signal generated by the first proximity switch 22 triggered by the detection holes 211, a second trigger signal generated by the second proximity switch 23 triggered by the stops 212, the total number of detection holes 211, and the arc parameters of the stops 212. The rotor speed is determined by combining the first speed obtained from the first trigger signal and the second speed obtained from the second trigger signal. The first speed and the second speed can be complementary in calculation method and timing, and the rotor speed obtained by combining the first speed and the second speed has higher accuracy, thus improving the measurement accuracy of the rotor speed.

[0043] In some embodiments, the control unit 24 may be specifically used to: obtain the number of times the first proximity switch 22 is triggered according to the first trigger signal; obtain the first rotational speed using the number of times the first proximity switch 22 is triggered, the total number, and the preset time period; obtain the trigger duration of the second proximity switch 23 according to the second trigger signal; and obtain the second rotational speed using the trigger duration and the arc parameter.

[0044] The time required for one revolution of the impeller can be calculated based on the number of times the first proximity switch 22 is triggered, the total number of detection holes 211, and the preset time period. Then, the first rotational speed can be obtained by converting the time required for one revolution of the impeller. For example, the first rotational speed can be obtained according to the following formulas (1) and (2):

[0045]

[0046] Where t1 is the duration of the preset time period in ms; A is the number of times the first proximity switch 22 is triggered within the preset time period; N is the total number of detection holes 211 on the low-speed shaft turntable 21; x1 is the time required for the impeller to rotate one revolution in ms; and v1 is the impeller speed in rpm.

[0047] The time required for the impeller to rotate one revolution can be calculated first based on the trigger duration of the second proximity switch 23 and the arc parameter of the stop block 212. Then, the second rotational speed can be obtained by converting the time required for the impeller to rotate one revolution. For example, the second rotational speed can be obtained according to the following formulas (3) and (4):

[0048]

[0049] Where x2 is the time required for the impeller to rotate one revolution; t2 is the trigger duration of the second proximity switch 23, in ms; B is the central angle corresponding to the stop block 212; and v2 is the second rotational speed, in rpm.

[0050] In some embodiments, a weighting coefficient can be set for the first speed and the second speed. The control unit 24 can be specifically used to: process the first speed and the second speed using a weighting algorithm to obtain the impeller speed. For example, the impeller speed can be obtained according to the following formula (5):

[0051] v=v1×α1+v2×α2 (5)

[0052] Where v is the impeller speed; v1 is the first speed; α1 is the weighting coefficient of the first speed; v2 is the second speed; and α2 is the weighting coefficient of the second speed. If the weighting coefficients of the first and second speeds are both 0.5, then the impeller speed can be the average of the first and second speeds. The weighting coefficients of the first and second speeds can be set according to the scenario and requirements. For example, if the impeller speed is low (i.e., less than a preset threshold), the weighting coefficient of the second speed can be appropriately increased, meaning the weighting coefficient of the second speed is higher than the weighting coefficient of the first speed.

[0053] In some embodiments, the control unit 204 can also be used to: determine whether the first proximity switch and the second proximity switch are abnormal based on the number of times the first rotation speed is obtained, the second trigger signal, and the first trigger signal. The detection hole 211 and the stop block 212 are both disposed on the low-speed shaft turntable 21 and rotate with the low-speed shaft turntable 21. Within a certain period of time, both the first proximity switch 22 and the second proximity switch 23 will be triggered. Based on the number of times the first rotation speed is obtained, the first trigger signal, and the second trigger signal, it can be determined whether one of the first proximity switch 22 and the second proximity switch 23 is triggered and the other is not. If one of the first proximity switch 22 and the second proximity switch 23 is triggered and the other is not, it can be determined that the untriggered proximity switch is abnormal, and a fault alarm signal can be issued.

[0054] In some examples, the control unit 24 may be specifically used to: determine that the second proximity switch 23 is abnormal when the number of times the first rotational speed is greater than 1 and no trigger edge appears in the second trigger signal; and determine that the first proximity switch 22 is abnormal when there is a trigger edge and an end edge in the second trigger signal and no trigger level exists in the first trigger signal.

[0055] If the number of times the first rotational speed is greater than 1, it indicates that the first rotational speed has been calculated more than once, and the first proximity switch 22 has been triggered multiple times. Given this, the second proximity switch 23 should also be triggered. When the second proximity switch 23 is triggered, a trigger edge should appear in the second trigger signal. This trigger edge is caused by the second proximity switch 23 switching from a state of never being triggered to a state of being triggered. The trigger edge of the second proximity switch 23 can be determined according to its settings; for example, it can be a rising edge, but it is not limited to this. If the number of times the first rotational speed is greater than 1, but no trigger edge appears in the second trigger signal, it is highly likely that the second proximity switch 23 should have been triggered but was not triggered due to an abnormality, and this can be considered an abnormality of the second proximity switch 23.

[0056] The trigger edge in the second trigger signal indicates that the state of the second proximity switch 23 has switched from never being triggered to being triggered, and the end edge in the second trigger signal indicates that the state of the second proximity switch 23 has switched from being triggered to not being triggered. For example, the trigger edge in the second trigger signal is a rising edge, and the end edge in the second trigger signal is a falling edge. The presence of a trigger level in the first trigger signal indicates that the first proximity switch 22 has been triggered. For example, if the trigger signal is high, the presence of a high level in the first trigger signal indicates that the first proximity switch 22 has been triggered, and the number of high levels in the first trigger signal can represent the number of times the first proximity switch 22 has been triggered. If the second trigger signal has both a trigger edge and an end edge, it indicates that the second proximity switch 23 has sensed at least one stop 212. During the process of the second proximity switch 23 sensing at least one stop 212, at least one detection hole 211 should pass through the first proximity switch 22, that is, the first proximity switch 22 should be triggered. If the second proximity switch 23 senses at least one stop 212, but the first proximity switch 22 is not triggered. The first proximity switch 22 was not triggered. It is highly likely that the first proximity switch 22 should have been triggered but was not triggered due to an abnormality. The first proximity switch 22 can be considered to be abnormal and a fault alarm signal should be issued.

[0057] In some embodiments, to ensure a more accurate impeller speed, the control unit can also be configured to: determine the second speed as the impeller speed if the first proximity switch malfunctions; and determine the first speed as the impeller speed if the second proximity switch malfunctions.

[0058] In some embodiments, a normal relationship between the number of times the first proximity switch 22 is triggered and the number of times the second proximity switch 23 is triggered can be predetermined when both the first proximity switch 22 and the second proximity switch 23 are normal. If the number of times the first proximity switch 22 is triggered and the number of times the second proximity switch 23 is triggered do not meet this normal relationship, it can be determined that one of the first proximity switch 22 and the second proximity switch 23 is abnormal, and a fault alarm signal can be issued.

[0059] A second aspect of this application provides a wind turbine generator set. The wind turbine generator set includes the rotor speed measurement system and a low-speed shaft 31 as described in the above embodiments. The low-speed shaft 31 is connected to a low-speed shaft turntable in the rotor speed measurement system. In the transmission system, the low-speed shaft 31 is a shaft with a lower rotational speed relative to the high-speed shaft. For example, the input shaft of the wind turbine generator set's gearbox is a high-speed shaft, and the output shaft is a low-speed shaft; the input shaft of the wind turbine generator set's speed increaser is a low-speed shaft, and the output shaft is a high-speed shaft.

[0060] For details regarding the impeller speed measurement system, please refer to the relevant descriptions in the above embodiments, which will not be repeated here.

[0061] The third aspect of this application provides a method for measuring the rotor speed of a wind turbine, which can be applied to the rotor speed measurement system of the wind turbine in the above embodiments. For details of the rotor speed measurement system of the wind turbine, please refer to the relevant descriptions of the above embodiments, which will not be repeated here. Figure 7 A flowchart of a wind turbine rotor speed measurement method provided in an embodiment of this application is shown below. Figure 7 As shown, the method for measuring the rotor speed of the wind turbine may include steps S401 to S403.

[0062] In step S401, during the rotation of the low-speed shaft turntable, the first trigger signal of the first proximity switch and the second trigger signal of the second proximity switch are collected within a preset time period.

[0063] In step S402, the first rotational speed and the second rotational speed are obtained based on the first trigger signal, the total number of detection holes, the second trigger signal, and the arc parameters of the stop.

[0064] In step S403, the impeller speed is determined based on the first speed and the second speed.

[0065] In some embodiments, step S402 can be further refined as follows: based on the first trigger signal, the number of times the first proximity switch is triggered is obtained; using the number of times the first proximity switch is triggered, the total number, and the preset time period, the first rotational speed is obtained.

[0066] In some embodiments, step S402 can be further refined as follows: based on the second trigger signal, the trigger duration of the second proximity switch is obtained; and the second rotational speed is obtained using the trigger duration and the arc parameter.

[0067] In some embodiments, step S403 can be further refined as follows: the first rotational speed and the second rotational speed are processed using a weighted algorithm to obtain the impeller rotational speed.

[0068] In some embodiments, the method for measuring the rotor speed of the wind turbine may further include: determining whether the first proximity switch and the second proximity switch are abnormal based on the number of times the first speed is obtained, the second trigger signal, and the first trigger signal.

[0069] Specifically, if the number of times the first rotation speed is greater than 1 and no trigger edge appears in the second trigger signal, the second proximity switch is determined to be abnormal; if there is a trigger edge and an end edge in the second trigger signal and no trigger level appears in the first trigger signal, the first proximity switch is determined to be abnormal.

[0070] Correspondingly, if the first proximity switch malfunctions, the second rotational speed is determined to be the impeller rotational speed; if the second proximity switch malfunctions, the first rotational speed is determined to be the impeller rotational speed.

[0071] To facilitate understanding, an example is provided here to illustrate the rotor speed measurement process of a wind turbine that includes an anomaly detection procedure. Figure 8 A flowchart illustrating an example of the wind turbine rotor speed measurement process provided in this application embodiment is shown below. Figure 8 As shown, the rotor speed measurement process of this wind turbine may include steps a1 to a11.

[0072] In step a1, the first trigger signal and the second trigger signal are acquired.

[0073] In step a2, determine whether a trigger level exists in the first trigger signal. If yes, proceed to step a3; otherwise, proceed to step a4.

[0074] In step a3, determine whether the number of times the first rotational speed is obtained is greater than 1. If yes, proceed to step a4; otherwise, return to step a1.

[0075] In step a4, determine whether a trigger edge occurs in the second trigger signal. If yes, proceed to step a5; otherwise, proceed to step a6.

[0076] In step a5, start the timer and increment the count of the first proximity switch being triggered.

[0077] In step a6, a proximity switch alarm signal is issued.

[0078] In step a7, determine whether the preset time period has been reached. If yes, proceed to step a8; otherwise, continue with step a7.

[0079] In step a8, the first rotational speed is obtained based on the number of times the first proximity switch is triggered.

[0080] In step a9, determine whether an end edge appears in the second trigger signal. If yes, proceed to step a10; otherwise, continue with step a9.

[0081] In step a10, the second rotational speed is obtained based on the trigger duration of the second proximity switch, as represented by the second trigger signal. The trigger duration can be the time between the trigger edge and the end edge of the second trigger signal.

[0082] In step a11, the impeller speed is obtained based on the first speed and the second speed.

[0083] The specific details of steps a1 to a11 above can be found in the relevant descriptions in the above embodiments, and will not be repeated here.

[0084] The fourth aspect of this application provides a wind turbine rotor speed measuring device, which is applied to the wind turbine rotor speed measuring system in the above embodiments. Figure 9 This is a schematic diagram of the structure of a wind turbine rotor speed measuring device provided in an embodiment of this application, as shown below. Figure 9 As shown, the impeller speed measuring device 500 of the wind turbine may include a data acquisition module 501, an intermediate speed determination module 502, and an impeller speed determination module 503.

[0085] The acquisition module 501 can be used to acquire the first trigger signal of the first proximity switch and the second trigger signal of the second proximity switch within a preset time period during the rotation of the low-speed shaft turntable.

[0086] The intermediate speed determination module 502 can be used to obtain the first speed and the second speed based on the first trigger signal, the total number of detection holes, the second trigger signal, and the arc parameters of the stop.

[0087] The impeller speed determination module 503 can be used to determine the impeller speed based on the first speed and the second speed.

[0088] In some embodiments, the intermediate speed determination module 502 may be specifically used to: obtain the number of times the first proximity switch is triggered according to the first trigger signal; and obtain the first speed using the number of times the first proximity switch is triggered, the total number, and a preset time period.

[0089] In some embodiments, the intermediate speed determination module 502 may be specifically used to: obtain the trigger duration of the second proximity switch being triggered based on the second trigger signal; and obtain the second speed using the trigger duration and arc parameters.

[0090] In some embodiments, the impeller speed determination module 503 may be specifically used to: process the first speed and the second speed using a weighted algorithm to obtain the impeller speed.

[0091] In some embodiments, the wind turbine rotor speed measuring device 500 may further include an anomaly determination module. The anomaly determination module can be used to determine whether the first proximity switch and the second proximity switch are abnormal based on the number of times the first speed is obtained, the second trigger signal, and the first trigger signal.

[0092] In some examples, the anomaly determination module can be specifically used to: determine that the second proximity switch is abnormal when the number of times the first rotational speed is greater than 1 and no trigger edge appears in the second trigger signal; and determine that the first proximity switch is abnormal when there is a trigger edge and an end edge in the second trigger signal and no trigger level exists in the first trigger signal.

[0093] In some embodiments, the impeller speed determination module 503 can also be used to: determine the second speed as the impeller speed if the first proximity switch is abnormal; and determine the first speed as the impeller speed if the second proximity switch is abnormal.

[0094] It should be noted that the above-mentioned method and device for measuring the rotor speed of the wind turbine are methods and devices corresponding to the above-mentioned system for measuring the rotor speed of the wind turbine. All implementation methods in the above-mentioned system embodiments are applicable to the embodiments of the above-mentioned method and device, and can achieve the same technical effect.

[0095] The fifth aspect of this application also provides a control device. Figure 10 This is a schematic diagram of the structure of a control device provided in an embodiment of this application, as shown below. Figure 10 As shown, the control device 600 includes a memory 601, a processor 602, and a computer program stored in the memory 601 and executable on the processor 602.

[0096] In some examples, the processor 602 described above may include a central processing unit (CPU), or an application-specific integrated circuit (ASIC), or one or more integrated circuits that may be configured to implement the embodiments of this application.

[0097] Memory 601 may include read-only memory (ROM), random access memory (RAM), disk storage media device, optical storage media device, flash memory device, electrical, optical, or other physical / tangible memory storage device. Therefore, typically, 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 wind turbine rotor speed measurement method according to embodiments of this application.

[0098] The processor 602 reads the executable program code stored in the memory 601 to run the computer program corresponding to the executable program code, so as to implement the wind turbine rotor speed measurement method in the above embodiment.

[0099] In some examples, the control device 600 may also include a communication interface 603 and a bus 604. For example, Figure 10 As shown, the memory 601, processor 602, and communication interface 603 are connected through bus 604 and complete communication with each other.

[0100] The communication interface 603 is mainly used to enable communication between various modules, devices, units, and / or equipment in the embodiments of this application. Input devices and / or output devices can also be connected through the communication interface 603.

[0101] Bus 604 includes hardware, software, or both, that couples the components of control device 600 together. For example, and not limitingly, bus 604 may include an Accelerated Graphics Port (AGP) or other graphics bus, an Enhanced Industry Standard Architecture (EISA) bus, a Front Side Bus (FSB), a Hyper Transport (HT) interconnect, an Industry Standard Architecture (ISA) bus, an Infinite Bandwidth Interconnect, a Low Pin Count (LPC) bus, a memory bus, a Micro Channel Architecture (MCA) bus, a Peripheral Component Interconnect (PCI) bus, a PCI-Express (PCI-E) bus, a Serial Advanced Technology Attachment (SATA) bus, a Video Electronics Standards Association Local Bus (VLB) bus, or other suitable buses, or combinations of two or more of these. Where appropriate, bus 604 may include one or more buses. Although specific buses are described and illustrated in the embodiments of this application, this application considers any suitable bus or interconnection.

[0102] A sixth aspect of this application also provides a computer-readable storage medium storing computer program instructions. When executed by a processor, these computer program instructions can implement the wind turbine rotor speed measurement method described in the above embodiments and achieve the same technical effect. To avoid repetition, further details are omitted here. The aforementioned computer-readable storage medium may include non-transitory computer-readable storage media, such as read-only memory (ROM), random access memory (RAM), magnetic disks, or optical disks, etc., and is not limited thereto.

[0103] This application provides a computer program product, which includes a computer program. When the computer program is executed by a processor, it implements the wind turbine rotor speed measurement method in the above embodiments and can achieve the same technical effect. To avoid repetition, it will not be described again here.

[0104] It should be clarified that the various embodiments in this specification are described in a progressive manner, and the same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments. For method embodiments, device embodiments, equipment embodiments, computer-readable storage medium embodiments, and computer program product embodiments, relevant parts can be referred to the description section of the system embodiments. This application is not limited to the specific steps and structures described above and shown in the figures. Those skilled in the art can make various changes, modifications, and additions, or change the order of steps, after understanding the spirit of this application. Furthermore, for the sake of brevity, detailed descriptions of known methods and techniques are omitted here.

[0105] The aspects of this application have been described above with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of this application. It should be understood that each block in the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, 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 apparatus to produce a machine such that these instructions, executable via the processor of the computer or other programmable data processing apparatus, enable the implementation of the functions / actions specified in one or more blocks of the flowchart illustrations and / or block diagrams. 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 is also understood that each block in the block diagrams and / or flowcharts, and combinations of blocks in the block diagrams and / or flowcharts, can also be implemented by dedicated hardware performing the specified functions or actions, or can be implemented by a combination of dedicated hardware and computer instructions.

[0106] Those skilled in the art will understand that the above embodiments are exemplary and not restrictive. Different technical features appearing in different embodiments can be combined to achieve beneficial effects. Based on a study of the drawings, specification, and claims, those skilled in the art should be able to understand and implement other variations of the disclosed embodiments. In the claims, the term "comprising" does not exclude other means or steps; the quantifier "a" does not exclude a plurality; the terms "first" and "second" are used to identify names and not to indicate any particular order. No reference numerals in the claims should be construed as limiting the scope of protection. The functionality of multiple parts appearing in the claims can be implemented by a single hardware or software module. The appearance of certain technical features in different dependent claims does not mean that these technical features cannot be combined to achieve beneficial effects.

Claims

1. A wind turbine rotor speed measurement system, characterized in that, include: A low-speed shaft turntable, wherein a plurality of detection holes are evenly distributed along the circumference on the low-speed shaft turntable, and at least one stop extending along the circumference is provided on the edge of the low-speed shaft turntable, wherein the fan shape formed by the stop and the center of the low-speed shaft turntable overlaps with at least two of the detection holes. A first proximity switch, disposed opposite to the surface of the low-speed shaft turntable, is configured to sense the detection hole; The second proximity switch, disposed opposite to the edge of the low-speed shaft turntable, is configured to sense the stop; The control unit is used to collect the first trigger signal of the first proximity switch and the second trigger signal of the second proximity switch within a preset time period during the rotation of the low-speed shaft turntable. Based on the first trigger signal, the total number of detection holes, the second trigger signal and the arc parameter of the stop, the first speed and the second speed are obtained. Based on the first speed and the second speed, the impeller speed is determined. The first trigger signal represents the number of times the first proximity switch is triggered, and the second trigger signal represents the trigger duration of the second proximity switch.

2. The system according to claim 1, characterized in that, The control unit is specifically used for: Based on the first trigger signal, the number of times the first proximity switch was triggered is obtained; The first rotational speed is obtained by using the number of times the first proximity switch is triggered, the total number, and the preset time period.

3. The system according to claim 1, characterized in that, The control unit is specifically used for: Based on the second trigger signal, the trigger duration of the second proximity switch is obtained; The second rotational speed is obtained using the trigger duration and the arc parameter.

4. The system according to claim 1, characterized in that, The control unit is specifically used for: The first rotational speed and the second rotational speed are processed using a weighted algorithm to obtain the impeller rotational speed.

5. The system according to claim 1, characterized in that, The control unit is also used for: Based on the number of times the first rotation speed is obtained, the second trigger signal, and the first trigger signal, it is determined whether the first proximity switch and the second proximity switch are abnormal.

6. The system according to claim 5, characterized in that, The control unit is specifically used for: If the number of times the first rotation speed is obtained is greater than 1, and no trigger edge appears in the second trigger signal, the second proximity switch is determined to be abnormal. If the second trigger signal contains both a trigger edge and a termination edge, and the first trigger signal does not contain a trigger level, then the first proximity switch is determined to be faulty.

7. The system according to claim 5, characterized in that, The control unit is also used for: If the first proximity switch malfunctions, the second rotational speed will be determined as the impeller rotational speed; If the second proximity switch malfunctions, the first rotational speed is determined to be the impeller rotational speed.

8. A wind turbine generator set, characterized in that, include: The wind turbine rotor speed measurement system as described in any one of claims 1 to 7; The low-speed shaft is connected to the low-speed shaft turntable in the impeller speed measurement system.

9. A method for measuring the impeller speed of a wind turbine, characterized in that, The method, applied to the impeller speed measurement system of the wind turbine as described in claim 1, comprises: During the rotation of the low-speed shaft turntable, the first trigger signal of the first proximity switch and the second trigger signal of the second proximity switch are collected within a preset time period. The first rotational speed and the second rotational speed are obtained based on the first trigger signal, the total number of the detection holes, the second trigger signal, and the arc parameters of the stop. The impeller speed is determined based on the first speed and the second speed. The first trigger signal represents the number of times the first proximity switch is triggered, and the second trigger signal represents the trigger duration of the second proximity switch.

10. A device for measuring the impeller speed of a wind turbine, characterized in that, The device, applied to the wind turbine rotor speed measurement system as described in claim 1, comprises: The acquisition module is used to acquire the first trigger signal of the first proximity switch and the second trigger signal of the second proximity switch within a preset time period during the rotation of the low-speed shaft turntable. The intermediate rotation speed determination module is used to obtain the first rotation speed and the second rotation speed based on the first trigger signal, the total number of the detection holes, the second trigger signal, and the arc parameters of the stop block; The impeller speed determination module is used to determine the impeller speed based on the first speed and the second speed. The first trigger signal represents the number of times the first proximity switch is triggered, and the second trigger signal represents the trigger duration of the second proximity switch.

11. A control device, characterized in that, include: Processor and memory storing computer program instructions; When the processor executes the computer program instructions, it implements the wind turbine rotor speed measurement method as described in claim 9.

12. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer program instructions, which, when executed by a processor, implement the wind turbine rotor speed measurement method as described in claim 9.

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