CN113565699A

CN113565699A - Pitch angle detection method, device and system of wind generating set

Info

Publication number: CN113565699A
Application number: CN202110932903.3A
Authority: CN
Inventors: 艾勇
Original assignee: Shanghai Envision Innovation Intelligent Technology Co Ltd; Envision Digital International Pte Ltd
Current assignee: Shanghai Envision Innovation Intelligent Technology Co Ltd; Envision Digital International Pte Ltd
Priority date: 2021-08-13
Filing date: 2021-08-13
Publication date: 2021-10-29
Anticipated expiration: 2041-08-13
Also published as: WO2023018370A2; WO2023018370A3; CN113565699B

Abstract

The application discloses a pitch angle detection method, device and system of a wind generating set, and belongs to the field of wind power generation. The method can determine the reference pitch angle of each target time period based on the actual active power of the target time period, and send early warning information when determining that an abnormal time period exists in the plurality of time periods, wherein the variation of the reference pitch angle relative to the actual pitch angle is larger than a variation threshold. Therefore, a user of the wind generating set can know that the pitch angle is abnormal in time, so that the pitch angle is adjusted in time, the power generation performance of the wind generating set is improved, and the generated energy of the wind generating set is prevented from being greatly lost.

Description

Pitch angle detection method, device and system of wind generating set

Technical Field

The disclosure relates to the field of wind power generation, in particular to a pitch angle detection method, device and system of a wind generating set.

Background

The wind generating set can convert kinetic energy of wind into electric energy, and further electricity is generated to a power grid. When the pitch angle of the wind generating set is at a proper angle, the power generation performance of the wind generating set can be optimized. The pitch angle of the wind generating set is an included angle between a top airfoil chord line of a blade of the wind generating set and a rotating plane of the blade.

However, due to human or environmental factors, the pitch angle may change during use, so that the pitch angle is not at a proper angle, and the power generation performance of the wind turbine generator system is poor.

Disclosure of Invention

The embodiment of the disclosure provides a method, a device and a system for detecting a pitch angle of a wind generating set, which can solve the problem that the power generation performance of the wind generating set is influenced because the pitch angle may be changed in the use process due to factors such as human or environment in the related art. The technical scheme is as follows:

in one aspect, a method for detecting a pitch angle of a wind turbine generator system is provided, and is applied to an angle detection device, and the method includes:

obtaining operation parameters of the wind generating set in a plurality of target time periods, wherein the operation parameters of each target time period comprise an actual pitch angle and an actual active power of the wind generating set in the target time period;

determining a reference pitch angle for each of the target time periods based on the actual active power for each of the target time periods;

if abnormal time periods exist in the target time periods, early warning information is sent, the early warning information is used for indicating that the pitch angle of the wind generating set is abnormal, and the variation of the reference pitch angle in the abnormal time periods relative to the actual pitch angle is larger than a variation threshold.

Optionally, the determining a reference pitch angle for each target period based on the actual active power for each target period includes:

and predicting the reference pitch angle of each target time interval by adopting a pitch angle determining function based on the actual active power of each target time interval, wherein the pitch angle determining function is used for reflecting the actual pitch angles in the plurality of target time intervals and the change rule of the actual active power.

Optionally, the pitch angle determining function comprises a plurality of sub-functions, different sub-functions corresponding to different power ranges; determining a reference pitch angle for each of the target periods using a pitch angle determination function based on the actual active power for each of the target periods, comprising:

for the actual active power of each target time interval, determining a target subfunction corresponding to the target power range based on the target power range in which the actual active power of the target time interval is located;

and determining the reference pitch angle of the target time period by adopting the target subfunction based on the actual active power of the target time period.

Optionally, before determining the reference pitch angle for each of the target periods using the pitch angle determination function based on the actual active power for each of the target periods, the method further includes:

and performing function fitting on the actual active power and the actual pitch angle in the plurality of target periods to obtain the pitch angle determination function.

Optionally, the pitch angle determination function comprises a plurality of sub-functions; the performing function fitting on the actual active power and the actual pitch angle in the multiple target periods to obtain the pitch angle determination function includes:

determining a plurality of different power ranges based on the actual active power for the plurality of target time periods;

and for each power range, performing function fitting on the actual active power and the actual pitch angle in the power range to obtain a subfunction corresponding to the power range.

Optionally, the obtaining of the operating parameters of the wind turbine generator system in a plurality of target periods includes:

obtaining operating parameters of the wind generating set in a plurality of alternative time periods;

acquiring environmental parameters of the wind generating set in the multiple alternative time periods, wherein the environmental parameters comprise a fluctuation value of wind speed and environmental temperature;

obtaining a plurality of target time interval operation parameters meeting target conditions from the plurality of candidate time interval operation parameters, wherein the target conditions comprise one or more of the following conditions:

the operation parameters comprise the actual active power, the actual pitch angle, the rotating speed of a generator in the wind generating set and the rotating speed of a wind wheel;

the variation of any data in the operation parameters in two adjacent alternative time periods is within a variation range;

the rotation speed of the generator is in a first rotation speed range;

the rotating speed of the wind wheel is in a second rotating speed range;

the actual active power is within a target range;

the actual pitch angle is within an angular range;

the ambient temperature is within a temperature range;

the fluctuation value of the wind speed is within a fluctuation range.

Optionally, when there are multiple abnormal time periods in the multiple target time periods, the early warning information includes at least one of the following information: a target abnormal time period in the abnormal time periods, a time length of the target abnormal time period from the current moment, and pitch angle data of the wind generating set;

wherein a duration of the target anomaly period from the current time is greater than durations of other anomaly periods from the current time, the pitch angle data including an actual pitch angle within the target anomaly period and an actual pitch angle within a target period prior to the target anomaly period.

In another aspect, there is provided an angle detection apparatus including:

the obtaining module is used for obtaining the operating parameters of the wind generating set in a plurality of target time periods, wherein the operating parameters of each target time period comprise the actual pitch angle and the actual active power of the wind generating set in the target time period;

a determining module for determining a reference pitch angle for each of the target time periods based on the actual active power for each of the target time periods;

and the sending module is used for sending early warning information if an abnormal time interval exists in the target time intervals, wherein the early warning information is used for indicating that the pitch angle of the wind generating set is abnormal, and the variation of the reference pitch angle in the abnormal time interval relative to the actual pitch angle is larger than a variation threshold value.

In yet another aspect, a system for detecting a pitch angle of a wind turbine generator set is provided, the system comprising: the angle detection device and the device for receiving early warning information in the aspects are described above.

In yet another aspect, a computer readable storage medium is provided, having instructions stored therein, the instructions being loaded and executed by a processor to implement the method of detecting a pitch angle of a wind park as described in the above aspect.

In still another aspect, there is provided an angle detecting apparatus including: the pitch angle detection method of the wind turbine generator system according to the present invention is implemented by a processor, and a computer program stored in the memory.

The beneficial effects brought by the technical scheme provided by the embodiment of the disclosure at least comprise:

the embodiment of the disclosure provides a pitch angle detection method, a device and a system of a wind generating set, the method can adopt a pitch angle determination function to process the actual active power of each target time interval, obtain the reference pitch angle of the target time interval, and send early warning information when determining that an abnormal time interval in which the variation of the reference pitch angle relative to the actual pitch angle is greater than the variation threshold exists in the multiple time intervals. Therefore, a user of the wind generating set can know that the pitch angle is abnormal in time, so that the pitch angle is adjusted in time, the power generation performance of the wind generating set is improved, and the generated energy of the wind generating set is prevented from being greatly lost.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present disclosure, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present disclosure, and it is obvious for those skilled in the art to obtain other drawings based on the drawings without creative efforts.

Fig. 1 is a schematic view of an implementation environment related to a pitch angle detection method for a wind turbine generator system according to an embodiment of the present disclosure;

FIG. 2 is a flowchart of a pitch angle detection method of a wind generating set according to an embodiment of the present disclosure;

FIG. 3 is a flowchart of another method for detecting a pitch angle of a wind turbine generator system according to an embodiment of the present disclosure;

FIG. 4 is a schematic diagram of an environmental parameter provided by an embodiment of the present disclosure;

FIG. 5 is a schematic illustration of a target condition provided by an embodiment of the present disclosure;

FIG. 6 is a schematic illustration of one operational parameter provided by an embodiment of the present disclosure;

FIG. 7 is a schematic illustration of a pitch angle determination function provided by embodiments of the present disclosure;

fig. 8 is a block diagram of an angle detection apparatus provided in an embodiment of the present disclosure;

fig. 9 is a block diagram of a determination module provided by an embodiment of the present disclosure.

Detailed Description

To make the objects, technical solutions and advantages of the present disclosure more apparent, embodiments of the present disclosure will be described in detail with reference to the accompanying drawings.

Fig. 1 is a schematic view of an implementation environment related to a pitch angle detection method for a wind turbine generator system according to an embodiment of the present disclosure. As shown in fig. 1, the implementation environment may include a data acquisition device 10, a wind turbine generator system 20, a cloud device 30, and an angle detection device 40.

Each of the data acquisition device 10, the cloud device 30, and the angle detection device 40 may be a server, or a server cluster composed of a plurality of servers, or a cloud computing service center.

The data acquisition device 10 is in communication connection with the wind turbine generator system 20 and the cloud device 30, and the cloud device 30 is also in communication connection with the angle detection device 40. The data acquisition device 10 may acquire the operating parameters of the wind turbine generator system 20 and send the acquired operating parameters to the cloud device 30. The angle detection device 40 may then obtain the operating parameters of the wind turbine generator system 20 from the cloud device 30. Alternatively, the data acquisition device 10 may be a supervisory control and data acquisition (SCADA) system.

Optionally, the implementation environment may not include the cloud device 30. In this manner, the data collection device 10 may send the collected operating parameters of the wind turbine generator system 20 directly to the angle detection device 40. Alternatively, the implementation environment may not include the data acquisition device 10, and the angle detection device 40 may directly obtain the operating parameters of the wind turbine generator system 20.

In the related art, after the wind turbine generator set 20 is sold to the user of the wind turbine generator set 20, the developer of the wind turbine generator set 20 may periodically test the performance of the wind turbine generator set 20. In this process, there may be a case where the pitch angle of the wind turbine generator system 20 is adjusted by a large amount due to an artificial malfunction. If the adjusted pitch angle is not at the proper angle, the power generation amount of the wind turbine generator system 20 may be lost. In this process, the user of the wind turbine generator system 20 cannot know in time whether the pitch angle of the wind turbine generator system 20 is abnormal. Thus, the power generation performance of the wind turbine generator system 20 is reduced, and the power generation amount of the wind turbine generator system 20 is greatly lost.

FIG. 2 is a flowchart of a pitch angle detection method of a wind turbine generator system according to an embodiment of the disclosure. The detection method can be applied to the angle detection apparatus 40 shown in fig. 1. As shown in fig. 1, the method may include:

step 201, obtaining operation parameters of the wind generating set in a plurality of target time periods.

In this disclosure, the angle detection device may obtain the operating parameters of the wind turbine generator system in a plurality of target time periods from the cloud device.

Step 202, determining a reference pitch angle for each target time period based on the actual active power for each target time period.

After acquiring the actual active power and the actual pitch angle of the wind generating set in a plurality of target periods, the angle detection device may determine the reference pitch angle of each target period based on the actual active power of each target period. The reference pitch angle, also referred to as a reference pitch angle or an ideal pitch angle, is used to reflect the pitch angle to which the desired active power for reaching the target period corresponds.

And 203, if abnormal time periods exist in the target time periods, sending early warning information.

The angle detection device may detect whether there is an abnormal period in the plurality of target periods after obtaining the reference pitch angle for each target period. If abnormal time periods exist in the target time periods, early warning information can be sent.

The early warning information is used for indicating that the pitch angle of the wind generating set is abnormal. The amount of change in the reference pitch angle from the actual pitch angle in the abnormal period is greater than the change threshold. The variation threshold may be a fixed variation pre-stored in the angle detection apparatus.

In summary, the embodiments of the present disclosure provide a pitch angle detection method for a wind turbine generator system, which may determine a reference pitch angle of each target time period based on actual active power of the target time period, and send warning information when determining that an abnormal time period in which a variation of the reference pitch angle with respect to the actual pitch angle is greater than a variation threshold exists in the plurality of time periods. Therefore, a user of the wind generating set can know that the pitch angle is abnormal in time, so that the pitch angle is adjusted in time, the power generation performance of the wind generating set is improved, and the generated energy of the wind generating set is prevented from being greatly lost.

FIG. 3 is a flowchart of another method for detecting a pitch angle of a wind turbine generator system according to an embodiment of the present disclosure. The detection method can be applied to the angle detection apparatus 40 shown in fig. 1. The detection method comprises the steps of determining actual pitch angles in a plurality of target time periods and the change rule of actual active power, and determining abnormal time periods in which the actual pitch angles do not meet the change rule from the plurality of target time periods to perform early warning. Therefore, the pitch angle can be adjusted in time, the power generation performance of the wind generating set is improved, and the generated energy of the wind generating set is prevented from being greatly lost. The change rule may be obtained in various manners, and the following describes the detection method by taking the change rule reflected by the pitch angle determination function as an example, as shown in fig. 3, the method may include:

301, obtaining the operating parameters of the wind generating set in a plurality of alternative time periods.

In the embodiment of the disclosure, the data acquisition device may acquire the operating parameters of the wind generating set at a plurality of alternative time periods, and send the operating parameters at the plurality of alternative time periods to the cloud device, so that the angle detection device may acquire the operating parameters of the wind generating set at the plurality of alternative time periods from the cloud device.

Wherein the operating parameters for each alternative time period may comprise an actual pitch angle and an actual active power of the wind park during the alternative time period. The actual active power refers to the electric power actually supplied to the grid by the wind turbine generator system during operation, and the actual pitch angle refers to the pitch angle actually adopted by the wind turbine generator system during operation.

Optionally, each alternative time period may include a plurality of sampling moments, and the data acquisition device may acquire active power of the wind turbine generator set at the plurality of sampling moments in the alternative time period to obtain a plurality of active powers. The data acquisition device may then detect whether the number of the plurality of active powers is less than a first number threshold. If it is detected that the number of the plurality of active powers is greater than or equal to the first number threshold, the data acquisition device may determine an average value of the plurality of active powers as an actual active power of the wind turbine generator set in the candidate time period. And sending the actual active power of the wind generating set in the alternative time period to the cloud equipment. If the number of the active powers is smaller than the first number threshold value, it can be determined that the actual active power of the wind generating set in the alternative time period is not obtained, and the actual active power of the wind generating set in the alternative time period does not need to be sent to the cloud device. The first number threshold may be a value pre-stored in the data acquisition device.

The root of the blade in the wind generating set can be provided with an angle sensor, the angle sensor can detect the pitch angle of the blade once at each sampling moment, and the detected pitch angles are sent to data acquisition equipment. The data acquisition device may detect whether a number of the plurality of pitch angles is less than a second number threshold after receiving the plurality of pitch angles transmitted by the angle sensor within the alternative time period. If it is detected that the number of the plurality of pitch angles is greater than or equal to the second number threshold, the data acquisition device may determine an average value of the plurality of pitch angles as an actual pitch angle of the wind turbine generator set in the alternative time period, and send the actual pitch angle of the wind turbine generator set in the alternative time period to the cloud device. If the number of the pitch angles is smaller than the second number threshold value, the data acquisition device may determine that the actual pitch angle of the wind generating set is not acquired in the alternative time period, and further, the actual pitch angle of the wind generating set in the alternative time period does not need to be sent to the cloud device. Wherein the second number threshold may be a pre-stored value in the data acquisition device.

For example, the duration of the alternative period may be 10 minutes, and the sampling interval may be 1 second, and the alternative period may include 600 sampling times. The data acquisition device may determine the average value of the active power of the 600 sampling moments as the actual active power of the wind turbine generator set in the candidate time period, and determine the average value of the pitch angle of the 600 sampling moments as the actual pitch angle of the wind turbine generator set in the candidate time period.

And 302, obtaining environmental parameters of the wind generating set in a plurality of alternative time periods.

The angle detection device can also acquire the environmental parameters of the wind generating set in a plurality of alternative time periods from the cloud device. Wherein, referring to FIG. 4, the environmental parameters may include a fluctuating value of wind speed and an ambient temperature over the alternate time period. The wind speed is the wind speed at the position of the wind generating set. The ambient temperature is the temperature at which the wind generating set is located.

Optionally, the data acquisition device may acquire wind speeds at a plurality of sampling times in each candidate period, determine a standard deviation based on the wind speeds at the plurality of sampling times, and determine the standard deviation as a fluctuation value of the wind speed in the candidate period. Wherein a larger standard deviation indicates a larger fluctuation of the wind speed during the candidate time period.

The data acquisition equipment can also acquire the ambient temperature of the position where the wind generating set is located in each alternative time period. Optionally, the data acquisition device may further establish a communication connection with a weather station for detecting the position of the wind turbine generator set, and the data acquisition device may acquire the ambient temperature of the position of the wind turbine generator set in each alternative time period from the weather station.

Step 303, obtaining the operating parameters of a plurality of target time periods meeting the target condition from the operating parameters of a plurality of candidate time periods.

After the angle detection device acquires the operating parameters and the environmental parameters of a plurality of alternative time periods, the data cleaning can be performed on the operating parameters of the alternative time periods, so that the operating parameters of a plurality of target time periods are obtained, the reliability of the operating parameters for function fitting is ensured, and the reliability of the function determined by the fitted pitch angle is ensured.

Optionally, the angle detection device may obtain the operation parameters of the multiple target periods that satisfy the target condition from the operation parameters of the multiple candidate periods. Wherein, referring to fig. 5, the target condition may include one or more of the following conditions:

a first optional condition, referring to fig. 6, includes the actual active power, the actual pitch angle, the rotational speed of the generator in the wind turbine generator system, and the rotational speed of the wind rotor.

After the angle detection device obtains the operation parameters of each alternative time period, it may detect whether the operation parameters of the alternative time period include actual active power, actual pitch angle, rotation speed of a generator in the wind turbine generator system, and rotation speed of a wind wheel. If it is detected that the operating parameter of the alternative time period does not include any one of the actual active power, the actual pitch angle, the rotational speed of the generator in the wind turbine generator set, and the rotational speed of the wind turbine, the angle detection device may determine that the alternative time period is not the target time period.

Optionally, a first rotation speed sensor may be disposed on a generator of the wind turbine generator system, and the first rotation speed sensor may detect a rotation speed of the generator at each sampling time, and send a plurality of detected rotation speeds of the generator to the data acquisition device. After receiving the multiple rotation speeds of the generator, the data acquisition device may detect whether the number of the multiple rotation speeds of the generator is smaller than a third number threshold. If it is detected that the number of the plurality of rotation speeds is greater than or equal to the third number threshold, the data acquisition device may determine an average value of the plurality of rotation speeds in the candidate time period as the rotation speed of the generator in the candidate time period. And the rotating speed of the generator in the target time interval can be sent to the cloud equipment, and then the angle detection equipment can acquire the rotating speed of the generator in the alternative time interval from the cloud equipment. If the number of the plurality of rotating speeds is smaller than the third number threshold value, the data acquisition device can determine the rotating speed of the generator which is not acquired in the alternative time period, and then the data acquisition device does not need to send the rotating speed of the generator in the alternative time period to the cloud device, so that the angle detection device cannot acquire the rotating speed of the generator in the alternative time period. Wherein the third number threshold is a number pre-stored in the data acquisition device.

The wind wheel of the wind generating set can be provided with a second rotating speed sensor, the second rotating speed sensor can detect the rotating speed of the wind wheel at each sampling moment, and a plurality of detected rotating speeds are sent to the data acquisition equipment. After receiving the plurality of rotating speeds of the wind wheel, the data acquisition device can detect whether the number of the plurality of rotating speeds of the wind wheel is smaller than a fourth number threshold value. If it is detected that the number of the plurality of rotation speeds is greater than or equal to the fourth number threshold, the data acquisition device may determine an average value of the plurality of rotation speeds as the rotation speed of the wind wheel in the candidate time period. And the rotating speed of the wind wheel in the alternative time period can be sent to the cloud equipment, and then the angle detection equipment can acquire the rotating speed of the wind wheel in the alternative time period. If the number of the plurality of rotating speeds is smaller than the fourth number threshold value, the data acquisition device can determine that the rotating speed of the wind wheel in the alternative time period is not acquired, and then the data acquisition device does not need to send the rotating speed of the wind wheel in the alternative time period to the cloud device, and the angle detection device cannot acquire the rotating speed of the wind wheel in the alternative time period. Alternatively, the wind rotor may comprise blades and a hub connected to the blades, and the second rotational speed sensor may be provided on the hub. The fourth number threshold may be a pre-stored value in the data acquisition device.

In a second optional condition, the variation of any one of the data in the operation parameters in two adjacent alternative time periods is within the variation range.

After the angle detection device acquires the operating parameters of the multiple candidate periods, for any data in the operating parameters, the angle detection device may detect whether the variation of the data in two adjacent candidate periods is within the variation range. If the variation of any data is not within the variation range, the angle detection device may determine that the data acquired in the two alternative time periods belong to invalid data, that is, the actual active power and the actual pitch angle acquired in the two alternative time periods cannot be used for function fitting, and then the angle detection device may determine that the two alternative time periods are not the target time period. If the variation of any data is within the variation range, the angle detection device may determine that the data acquired in the two alternative time periods belong to valid data, that is, the actual active power and the actual pitch angle acquired in the two alternative time periods are enough for function fitting. Wherein, the angle detection device stores the variation range in advance.

Optionally, the lower limit of the variation range is greater than 0, and if the variation of the two adjacent candidate time periods is 0, it indicates that the data of the two adjacent candidate time periods are not changed, and the angle detection device may determine that the two candidate time periods are not the target time period.

In the operation process of the wind generating set, the operation parameters of the wind generating set are slightly changed in two adjacent time intervals under the influence of wind speed, and the data in the two adjacent alternative time intervals are normally changed on the premise of not influencing the generating capacity or the service life of the wind generating set. For example, the pitch angle of the wind turbine generator system is reduced by 0.01 degrees due to the wind speed. Therefore, if the data in the two adjacent alternative time periods are not slightly changed, the wind generating set may be in an abnormal state, and the data in the two adjacent alternative time periods belong to invalid data. Therefore, when the lower limit value of the variation range is larger than 0, the collection of the invalid data can be effectively avoided.

A third alternative condition is that the rotational speed of the generator is within the first rotational speed range.

The angle detection device may detect whether the rotation speed of the generator for each of the alternative time periods is within the first rotation speed range. If the rotational speed of the generator is not within the first rotational speed range, the angle detection device may determine that the alternative time period is not the target time period. The first rotating speed range is stored in the angle detection device in advance, and the first rotating speed range refers to the rotating speed range of the generator when the wind turbine generator set operates normally and stably.

When the wind generating set is in a shutdown state, the rotating speed of the generator in the alternative time period is not in the first rotating speed range, so that the actual active power and the actual pitch angle in the alternative time period cannot represent the state of the wind generating set in normal and stable operation, and belong to invalid data. The acquisition of the invalid data can be effectively avoided by setting the rotating speed of the generator to be in the first rotating speed range.

A fourth alternative condition is that the rotational speed of the wind rotor is within the second rotational speed range.

The angle detection device may detect whether the rotational speed of the wind rotor for each alternative time period is within a second rotational speed range. If the rotating speed of the wind wheel is not within the second rotating speed range, the angle detection device may determine that the actual active power and the actual pitch angle acquired in the alternative time period are invalid data, and then the angle detection device may determine that the alternative time period is not the target time period. If the rotating speed of the wind wheel is within the second rotating speed range, the angle detection device can determine the actual active power and the actual pitch angle acquired in the alternative time period as effective data. The second rotating speed range is stored in the angle detection device in advance, and the second rotating speed range refers to the rotating speed range of the wind wheel when the wind turbine generator set operates normally and stably.

Optionally, when the wind turbine generator system is in the shutdown state, the rotation speed of the wind turbine in the alternative time period may not be in the second rotation speed range, so that the actual active power and the actual pitch angle in the alternative time period may not represent the state of the wind turbine generator system in normal and stable operation, and belong to invalid data. The collection of the invalid data can be effectively avoided by setting the rotating speed of the wind wheel within a second rotating speed range.

In a fifth alternative, the actual active power is within the target range.

The angle detection device may detect whether the actual active power of each alternative time period is within a target range. If the actual active power is not within the target range, the angle detection device may determine that the actual active power and the actual pitch angle acquired in the alternative time period are invalid data, and then the angle detection device may determine that the alternative time period is not the target time period. If the actual active power is within the target range, the angle detection device may determine the actual active power and the actual pitch angle acquired in the alternative time period as valid data. The target range is stored in the angle detection device in advance, and the target range refers to the range of the actual active power when the wind turbine generator set operates normally and stably.

Optionally, when the wind turbine generator system is in the shutdown state, the actual active power of the wind turbine generator system may not be in the target range, and therefore the actual active power and the actual pitch angle in the alternative time period may not represent the state of the wind turbine generator system in normal and stable operation, and belong to invalid data. The collection of the invalid data can be effectively avoided by setting the actual active power to be within the target range.

A sixth alternative condition, the actual pitch angle is within the angular range.

The angle detection device may detect whether the actual pitch angle for each alternative period is within the angle range. If the actual pitch angle is not within the angle range, the angle detection device may determine that the actual active power and the actual pitch angle acquired in the alternative time period are invalid data, and then the angle detection device may determine that the alternative time period is not the target time period. If the actual pitch angle is within the angle range, the angle detection device may determine that the actual active power and the actual pitch angle acquired in the alternative time period are valid data. The angle range is stored in the angle detection device in advance, and the angle range refers to the range of the actual pitch angle when the wind turbine generator set operates normally and stably.

Optionally, when the wind turbine generator system is in the shutdown state, the actual pitch angle of the wind turbine generator system may not be within the angle range, so that the actual active power and the actual pitch angle in the alternative time period may not represent the state of the wind turbine generator system in normal and stable operation, and belong to invalid data. The collection of the invalid data can be effectively avoided by setting the actual pitch angle to be within the angle range.

A seventh alternative condition is that the ambient temperature is within a temperature range.

The angle detection device may detect whether the ambient temperature of each of the alternative periods is within the temperature range. If the ambient temperature is not within the temperature range, the angle detection device may determine that the actual active power and the actual pitch angle acquired in the alternative time period are invalid data, and then the angle detection device may determine that the alternative time period is not the target time period. If the ambient temperature is within the temperature range, the angle detection device may determine the actual active power and the actual pitch angle acquired in the alternative time period as valid data. The temperature range is stored in the angle detection device in advance, and the temperature range refers to the temperature of the environment when the wind turbine generator set normally and stably operates.

Optionally, the lower limit of the temperature range is greater than a temperature threshold, and when the ambient temperature is less than the temperature threshold, the blades in the wind turbine generator set may be frozen. The actual active power and the actual pitch angle of the wind generating set when the blade is frozen cannot represent the normal and stable running state of the wind generating set, and the blade icing data belongs to invalid data. Therefore, when the lower limit value of the temperature range is larger than the temperature threshold value, the collection of the invalid data can be effectively avoided.

An eighth alternative condition is that the fluctuation value of the wind speed is within the fluctuation range.

The angle detection device may detect whether the fluctuation value of the wind speed for each of the alternative time periods is within the fluctuation range. If the fluctuation value of the wind speed is not within the fluctuation range, the angle detection device may determine that the actual active power and the actual pitch angle acquired in the alternative time period are invalid data, and then the angle detection device may determine that the alternative time period is not the target time period. If the fluctuation value of the wind speed is within the fluctuation range, the angle detection device may determine the actual active power and the actual pitch angle acquired in the alternative time period as valid data.

When the fluctuation value of the wind speed is out of the fluctuation range, the fluctuation of the wind speed in the alternative time period is large, and correspondingly, the active power fluctuation at a plurality of sampling moments in the alternative time period is large, namely, a plurality of active powers in the alternative time period are unstable. Therefore, the actual active power and the actual pitch angle in the alternative period cannot represent the normal and stable operation state of the wind generating set, and belong to invalid data.

For each alternative time period, the angle detection device may further obtain, from the cloud device, a fluctuation value of each data in the operation parameters of the alternative time period. If the fluctuation value of any of the data is outside the target fluctuation range, the angle detection device may determine that the alternative time period is not the target time period. Wherein the target fluctuation range may be a fixed range previously stored by the angle detection device.

For example, the angle detection device may obtain a fluctuation value of an actual pitch angle in the candidate period, and if the fluctuation value of the actual pitch angle is outside the target fluctuation range, the angle detection device may determine that the fluctuation of the pitch angle corresponding to a plurality of sampling moments in the candidate period is large, and at this time, a plurality of active powers in the candidate period are unstable. Therefore, the actual active power and the actual pitch angle in the alternative period cannot represent the normal and stable operation state of the wind generating set, and belong to invalid data.

And 304, performing function fitting on the actual active power and the actual pitch angle in a plurality of target time periods to obtain a pitch angle determination function.

After obtaining the actual active power and the actual pitch angle in the multiple target periods, the angle detection device may perform function fitting on the actual active power and the actual pitch angle in the multiple target periods, so as to obtain the pitch angle determination function. Wherein the pitch angle determination function is used for reflecting the actual pitch angle and the change rule of the actual active power in the plurality of target periods. Optionally, the pitch angle change function may reflect an overall change rule of the actual pitch angle and the actual active power in the multiple target time periods, and a time period in which the actual pitch angle and the actual active power in the multiple target time periods do not conform to the change rule is an abnormal time period.

Alternatively, the pitch angle determination function may comprise a plurality of sub-functions, the different sub-functions corresponding to different power ranges. The angle detection device may determine a plurality of different power ranges based on the actual active power for a plurality of target periods in the process of function fitting the actual active power and the actual pitch angle for the plurality of target periods. For each power range, the angle detection device may perform function fitting on the actual active power and the actual pitch angle in the power range to obtain a sub-function corresponding to the power range. For example, the difference between the lower limits of the two adjacent power ranges may be 100 kilowatts (kw).

For example, the angle detection device may employ a data bucket algorithm to determine a plurality of different power ranges. The process may include: the angle detection device may divide the actual active power of the plurality of target time periods into a plurality of different power ranges in order from small to large. For example, assuming that the number of the plurality of target periods is 6, where the power of the first target period is p1, the actual active power of the second target period is p2, the actual active power of the third target period is p3, the actual active power of the fourth target period is p4, the actual active power of the fifth target period is p5, the actual active power of the sixth target period is p6, and p1> p3> p6> p4> p2> p5, the angle detection device may divide the actual active powers of the 6 target periods into two power ranges in order from small to large, one power range is [ p1, p6], and the other power range may be (p6, p 5).

For each power range, the angle detection device may perform function fitting on the actual active power and the actual pitch angle in the power range by using a fitting regression algorithm, so as to obtain a subfunction corresponding to the power range, and may store a corresponding relationship between the power range and the subfunction. The fitting regression algorithm may be a least squares method.

For example, assuming that the angle detection device determines N power ranges, where the N power ranges correspond to N subfunctions, an ith subfunction of the N subfunctions may satisfy: and y is ki x + bi, wherein x is the actual active power of the wind generating set, and y is the reference pitch angle of the wind generating set. N is an integer greater than 1, and i is a positive integer no greater than N. It is understood that k may be the same or different in different sub-functions, and b may be the same or different in different sub-functions.

Assuming that the angle detection device determines three power ranges, the pitch angle determination function may satisfy:

referring to the above formula, it can be seen that the power range (P1, P2) corresponds to the subfunction y of y-k 1 × x + b1, the power range (P2, P3) corresponds to the subfunction y-k 2 × x + b2, the power range (P3, P4) corresponds to the subfunction y-k 3 × x + b3., and the function curve of the pitch angle determination function may be as shown in fig. 7, where x is the active power and y is the pitch angle in fig. 7.

In the embodiment of the present disclosure, after determining the subfunction corresponding to each power range, the angle detection device may perform hypothesis testing on the parameters in the subfunction by using a hypothesis testing algorithm. If the parameter hypothesis is successfully verified, the angle detection device may determine that the sub-function can be used to predict the pitch angle of the wind turbine generator set. If the hypothesis of the parameters fails to be checked, the angle detection device can determine that the sub-function cannot be used for predicting the pitch angle of the wind generating set, and the angle detection device can remove the sub-function within the power range. Wherein the parameters in the subfunction may be k and b. By way of example, the hypothesis testing algorithm may be an F test, a t test, a Z test, or the like.

Step 305, determining a reference pitch angle of each target time interval by using a pitch angle determination function based on the actual active power of each target time interval.

The angle detection device may, after determining the pitch angle determination function, determine a reference pitch angle for each target period using the pitch angle determination function based on the actual active power for the each target period.

Optionally, for the actual active power of each target time period, the angle detection device may determine, based on a target power range in which the actual active power of the target time period is located, a target subfunction corresponding to the target power range. Further, the angle detection device may determine the reference pitch angle of the target time period based on the actual active power of the target time period by using the target sub-function.

After obtaining the subfunction corresponding to each power range, for the actual active power in each target time period, the angle detection device may determine, based on the target power range in which the actual active power in the target time period is located, a target subfunction corresponding to the target power range from the correspondence between the power range and the subfunction. Then, the angle detection device may determine the reference pitch angle for the target time period using the target sub-function based on the actual active power for the target time period.

For example, if the objective sub-function satisfies: k1 × x + b1, the angle detection device may bring the actual active power of the target period into the target sub-function, so that the reference pitch angle y of the target period may be obtained.

The angle detection device can determine a plurality of different power ranges based on the actual active power of the target time periods, determine a sub-function corresponding to each power range, and further determine the reference pitch angle according to each sub-function. Compared with the method that a function is obtained by adopting the actual active power and the actual pitch angle in a plurality of target time periods in a fitting mode, and the reference pitch angle is determined based on the function, the method effectively improves the reliability of the determined reference pitch angle.

And step 306, detecting whether an abnormal time interval exists in the target time intervals.

The angle detection device may detect whether there is an abnormal period in the plurality of target periods after obtaining the reference pitch angle for each target period. If there is an abnormal period in the plurality of target periods, the angle detecting device may determine that the pitch angle of the wind turbine generator set is abnormal in the plurality of target periods, and thus may execute step 307. If there is no abnormal time period in the multiple target time periods, the angle detection device may determine that the pitch angle of the wind turbine generator set is not abnormal in the multiple target time periods, and may end the process.

Alternatively, for each target period, the angle detection device may determine the amount of change in the reference pitch angle from the actual pitch angle for that target period. And detecting whether the variation of the target period is larger than a variation threshold. If the variation is greater than the variation threshold, the angle detection apparatus may determine that the target period is an abnormal period. If the variation is less than or equal to the variation threshold, the angle detection apparatus may determine that the target period part is not an abnormal period.

As shown in fig. 7, assume that the actual active power for a certain target period is P21, and the actual pitch angle a 1. If the actual active power P21 is located in the power range of (P2, P3), the angle detection device may process the actual active power P21 by using the sub-function y ═ k2 × x + b2, to obtain a reference pitch angle a 2, since a variation amount of the reference pitch angle a 2 with respect to the actual pitch angle a 1 is greater than a variation threshold, the angle detection device may determine that the target period is an abnormal period, and may perform step 307.

And 307, sending early warning information.

As shown in fig. 1, the implementation environment may also include an early warning device 50 that establishes a communication connection with the angle detection device 40. The pre-warning device 50 may be a computer device. After determining that abnormal time periods exist in the target time periods, the angle detection device can send early warning information to early warning equipment on the side of the wind generating set, wherein the early warning information is used for indicating that the pitch angle of the wind generating set is abnormal, so that a user can timely know that the pitch angle of the wind generating set is abnormal and further timely adjust the pitch angle, the power generation performance of the wind generating set is improved, and the generated energy of the wind generating set is prevented from being greatly lost. The early warning device may display the early warning information after receiving the early warning information, and/or the early warning device may send an alarm signal. Wherein the alert signal may include at least one of a sound and a light.

In an embodiment of the present disclosure, the warning information may include at least one of the following information: the method comprises the steps of target abnormal time in the abnormal time, the time length of the target abnormal time from the current moment, and pitch angle data of the wind generating set.

If only one abnormal time interval exists in the target time intervals, the target abnormal time interval is the abnormal time interval. If multiple abnormal time periods exist in the multiple target time periods, the time length of the target abnormal time period from the current time is longer than the time lengths of other abnormal time periods from the current time, namely the target abnormal time period is the time period in which the pitch angle is earliest to be abnormal in the multiple abnormal time periods. The pitch angle data may comprise the actual pitch angle within the target anomaly period and the actual pitch angle within one target period before the target anomaly period, i.e. the pitch angle data comprises the pitch angle after the anomaly occurred and the pitch angle before the anomaly occurred.

In the embodiment of the disclosure, the target abnormal time period is sent to the early warning device on the wind generating set side, so that a user of the wind generating set can timely acquire the earliest abnormal time of the wind generating set. The duration of the target abnormal time interval from the current time is sent to the early warning equipment of the wind generating set, so that a user of the wind generating set can know the duration of the abnormal state of the pitch angle, the power generation amount lost in the duration can be determined based on the duration, and then a claim is settled to a developer of the wind generating set. Meanwhile, the pitch angle data of the wind generating set is sent to the early warning equipment of the wind generating set, so that a user of the wind generating set can effectively prove that the pitch angle of the wind generating set is abnormally modified by a developer of the wind generating set through the pitch angle data of the wind generating set.

It is understood that wind speed may also cause a change in the pitch angle of the wind park, but the change may have less impact on the active power of the wind park, and therefore it may not be possible to accurately determine whether the change is abnormal based on the amount of change in the pitch angle alone. The method provided by the embodiment of the disclosure can process the actual active power to obtain the reference pitch angle based on the pitch angle determining function, and determine whether the pitch angle of the wind generating set is abnormal or not based on the variation of the reference pitch angle compared with the actual pitch angle. Therefore, the determined changed pitch angle is an abnormity which has a large influence on the active power of the wind generating set, and the reliability of the detection of the pitch angle is ensured.

The foregoing embodiment is described by taking as an example that the change law is reflected by a pitch angle determination function, and in actual implementation, the change law can also be reflected by a reference curve, which is a fitting curve based on actual pitch angles and actual active power in a plurality of target periods. Alternatively, the change rule may be reflected by an Artificial Intelligence (AI) model, and the AI model is obtained by training actual pitch angles and actual active power in a plurality of target time periods as training samples. The manner of determining the abnormal time period based on the change rule refers to the foregoing steps, and details are not repeated in this embodiment of the application.

It should be noted that, the sequence of the steps of the method for detecting the pitch angle of the wind turbine generator system provided in the embodiment of the present application may be appropriately adjusted, and the steps may also be deleted according to the situation. For example, step 302 may be performed before step 301. Any method that can be easily conceived by a person skilled in the art within the technical scope disclosed in the present application is covered by the protection scope of the present application, and thus the detailed description thereof is omitted.

In summary, the embodiments of the present disclosure provide a method for detecting a pitch angle of a wind turbine generator system, which can determine a reference pitch angle of each target time period based on the actual active power of the target time period. And sending early warning information when determining that an abnormal time interval in which the variation of the reference pitch angle relative to the actual pitch angle is larger than the variation threshold exists in the plurality of time intervals. Therefore, a user of the wind generating set can know that the pitch angle is abnormal in time, so that the pitch angle is adjusted in time, the power generation performance of the wind generating set is improved, and the generated energy of the wind generating set is prevented from being greatly lost.

Fig. 8 is a block diagram of an angle detection apparatus provided in an embodiment of the present disclosure. As shown in fig. 8, the angle detecting apparatus 40 may include:

an obtaining module 401, configured to obtain operating parameters of the wind turbine generator set in a plurality of target time periods, where the operating parameters in each target time period include an actual pitch angle and an actual active power of the wind turbine generator set in the target time period.

A determining module 402 for determining a reference pitch angle for each target period based on the actual active power for each target period.

A sending module 403, configured to send, if an abnormal time period exists in the multiple target time periods, early warning information, where the early warning information is used to indicate that the pitch angle of the wind turbine generator system is abnormal, and a variation of the reference pitch angle in the abnormal time period with respect to an actual pitch angle is greater than a variation threshold.

In summary, the embodiments of the present disclosure provide an angle detection device, since the angle detection device may determine the reference pitch angle of each target time period based on the actual active power of the target time period. And sending early warning information when determining that an abnormal time interval in which the variation of the reference pitch angle relative to the actual pitch angle is larger than the variation threshold exists in the plurality of time intervals. Therefore, a user of the wind generating set can know that the pitch angle is abnormal in time, so that the pitch angle is adjusted in time, the power generation performance of the wind generating set is improved, and the generated energy of the wind generating set is prevented from being greatly lost.

Optionally, the determining module is configured to:

and determining the reference pitch angle of each target time period by adopting a pitch angle determining function based on the actual active power of each target time period, wherein the pitch angle determining function is used for reflecting the actual pitch angles in a plurality of target time periods and the change rule of the actual active power.

Optionally, the pitch angle determining function includes a plurality of sub-functions, and different sub-functions correspond to different power ranges; as shown in fig. 9, the determining module 402 may include:

the determining sub-module 4021 is configured to determine, for the actual active power in each target time period, a target sub-function corresponding to the target power range based on the target power range in which the actual active power in the target time period is located.

The processing sub-module 4022 is configured to process the actual active power in the target time period by using the target sub-function, and obtain the reference pitch angle in the target time period.

Optionally, the determining module 402 is further configured to:

before determining the reference pitch angle of each target time interval by adopting a pitch angle determination function based on the actual active power of each target time interval, performing function fitting on the actual active power and the actual pitch angle of a plurality of target time intervals to obtain a pitch angle determination function.

Optionally, the determining module 402 is further configured to:

determining a plurality of different power ranges based on the actual active power for a plurality of target periods, the pitch angle determination function comprising a plurality of sub-functions; and for each power range, performing function fitting on the actual active power and the actual pitch angle in the power range to obtain a subfunction corresponding to the power range.

Optionally, the obtaining module 401 is configured to:

and obtaining the operating parameters of the wind generating set in a plurality of alternative time periods.

And acquiring environmental parameters of the wind generating set in a plurality of alternative time periods, wherein the environmental parameters comprise a fluctuation value of wind speed and environmental temperature.

Obtaining a plurality of target time interval operation parameters meeting target conditions from a plurality of candidate time interval operation parameters, wherein the target conditions comprise one or more of the following conditions:

the operation parameters comprise actual active power, actual pitch angle, rotating speed of a generator in the wind generating set and rotating speed of a wind wheel.

The variation of any data in the operation parameters in two adjacent alternative time periods is in a variation range.

The rotational speed of the generator is in a first rotational speed range.

The rotational speed of the wind wheel is within a second rotational speed range.

The actual active power is within the target range.

The actual pitch angle is within the angular range.

The ambient temperature is within a temperature range.

The fluctuation value of the wind speed is within the fluctuation range.

Optionally, when there are multiple abnormal time periods in the multiple target time periods, the warning information includes at least one of the following information: the method comprises the steps of target abnormal time in the abnormal time, the time length of the target abnormal time from the current moment, and pitch angle data of the wind generating set.

Wherein the time length of the target abnormal period from the current time is greater than the time lengths of other abnormal periods from the current time, and the pitch angle data includes an actual pitch angle in the target abnormal period and an actual pitch angle in a target period before the target abnormal period.

The embodiment of the present disclosure provides a pitch angle detection system of a wind generating set, which may include an angle detection device 40 shown in fig. 8 or 9 and an early warning device 50 shown in fig. 1 for receiving early warning information.

The embodiment of the application provides an angle detection device, and the angle detection device can comprise: the processor executes the computer program and realizes the pitch angle detection method of the wind generating set provided by the method embodiment. Such as the method shown in fig. 2 or fig. 3.

The embodiment of the application provides a computer-readable storage medium, and the computer-readable storage medium stores instructions, and the instructions, when executed by a processor, implement the pitch angle detection method of the wind generating set provided by the above method embodiment, such as the method shown in fig. 2 or fig. 3.

The embodiment of the present application provides a computer program product containing instructions, which when run on a computer, causes the computer to execute the method for detecting the pitch angle of the wind turbine generator system, such as the method shown in fig. 2 or fig. 3, provided by the above method embodiment.

In the disclosed embodiments, the terms "first," "second," "third," and "fourth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. The meaning of the term "at least one" in the embodiments of the present disclosure means one or more. The term "plurality" in the embodiments of the present disclosure means two or more. The term "and/or" in the embodiments of the present disclosure is only one kind of association relationship describing an associated object, and means that three relationships may exist, for example, a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone.

The above description is intended to be exemplary only and not to limit the present disclosure, and any modification, equivalent replacement, or improvement made without departing from the spirit and scope of the present disclosure is to be considered as the same as the present disclosure.

Claims

1. A method for detecting a pitch angle of a wind generating set is applied to an angle detection device, and comprises the following steps:

2. The method according to claim 1, wherein said determining a reference pitch angle for each of said target periods based on an actual active power for each of said target periods comprises:

and determining a reference pitch angle of each target time period by adopting a pitch angle determining function based on the actual active power of each target time period, wherein the pitch angle determining function is used for reflecting the actual pitch angles in the plurality of target time periods and the change rule of the actual active power.

3. A method according to claim 2, wherein the pitch angle determining function comprises a plurality of sub-functions, different ones of the sub-functions corresponding to different power ranges; determining a reference pitch angle for each of the target periods using a pitch angle determination function based on the actual active power for each of the target periods, comprising:

4. The method according to claim 2, wherein before said determining a reference pitch angle for each of said target periods using a pitch angle determination function based on an actual active power for each of said target periods, said method further comprises:

5. The method according to claim 4, wherein the pitch angle determination function comprises a plurality of sub-functions;

the performing function fitting on the actual active power and the actual pitch angle in the multiple target periods to obtain the pitch angle determination function includes:

6. The method according to any one of claims 1 to 5, wherein obtaining the operating parameters of the wind park for a plurality of target periods comprises:

the rotation speed of the generator is in a first rotation speed range;

the rotating speed of the wind wheel is in a second rotating speed range;

the actual active power is within a target range;

the actual pitch angle is within an angular range;

the ambient temperature is within a temperature range;

the fluctuation value of the wind speed is within a fluctuation range.

7. The method according to any one of claims 1 to 5, wherein when there are a plurality of abnormal periods in the plurality of target periods, the warning information includes at least one of the following information: a target abnormal time period of the plurality of abnormal time periods, a time length of the target abnormal time period from a current time, and pitch angle data of the wind generating set;

wherein the target anomaly period is longer in duration from the current time than other of the plurality of anomaly periods, the pitch angle data comprising an actual pitch angle within the target anomaly period and an actual pitch angle within a target period prior to the target anomaly period.

8. An angle detection apparatus characterized by comprising:

9. A system for detecting a pitch angle of a wind park, the system comprising: an angle detection apparatus as claimed in claim 8 and an early warning apparatus for receiving early warning information.

10. A computer readable storage medium, characterized in that instructions are stored therein, which are loaded and executed by a processor to implement the method of detecting a pitch angle of a wind park according to any of claims 1 to 7.