CN116428130B - Fan variable pitch system monitoring method, monitoring equipment and storage medium - Google Patents
Fan variable pitch system monitoring method, monitoring equipment and storage medium Download PDFInfo
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Classifications
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D17/00—Monitoring or testing of wind motors, e.g. diagnostics
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M13/00—Testing of machine parts
- G01M13/04—Bearings
- G01M13/045—Acoustic or vibration analysis
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
Abstract
The application provides a monitoring method, monitoring equipment and a storage medium of a fan variable pitch system, and relates to the technical field of fan power generation, wherein the method is applied to the monitoring equipment for monitoring the fan variable pitch system, and the monitoring equipment comprises the following steps: an impact vibration sensor; the method comprises the following steps: obtaining variable-pitch bearing vibration data acquired by an impact vibration sensor; and determining the variable pitch state of the fan variable pitch system based on the variable pitch bearing vibration data acquired by the impact vibration sensor. Under the condition of independent fan SCADA system parameter reading, the variable pitch state is identified by means of variable pitch bearing vibration data acquired by the impact vibration sensor without being influenced by a variable pitch structural form, variable pitch operation conditions are judged in real time by means of sensor data, various variable pitch structures can be considered, data processing logic is simple, practicability is high, and cost is low.
Description
Technical Field
The application relates to the technical field of wind power generation, in particular to a monitoring method, monitoring equipment and a storage medium of a fan pitch system.
Background
All parts of a variable pitch system of the wind driven generator are arranged on a hub, all parts rotate at a certain speed along with the hub during normal operation of the wind driven generator, blades (root parts) of the wind driven generator are connected with the hub through variable pitch bearings, the variable pitch system controls the rotating speed of a wind wheel through controlling the angles of the blades, the output power of the wind driven generator is further controlled, and the wind driven generator can be safely stopped in an aerodynamic braking mode. The opening and closing of the blade angle has larger influence on the change of the integral vibration of the fan, and under the condition that the corresponding parameters of the SCADA system of the fan cannot be obtained, the obtaining of the relevant parameters such as the variable pitch opening and feathering, the variable pitch rotating speed, the blade angle state and the like through an external monitoring mode has larger significance for fan monitoring, such as blade monitoring, variable pitch bearing monitoring, tower drum monitoring, transmission chain monitoring and the like.
At present, due to randomness of movement of a pitch bearing and variability of continuous operation time, the acquisition of operation data of a pitch bearing has certain difficulty, and further the pitch working condition of the system is difficult to monitor. On one hand, the difficulty is that the feathering time is long, the feathering time is short, the feathering is the motion under two working conditions, and the same unit has the change in each feathering time; on the other hand, the difficulty is that on the premise of not accessing the feathering state data of the SCADA system, the feathering state and the feathering time are difficult to obtain, and further the acquisition of the data in the pitching process is influenced.
Disclosure of Invention
In view of the above, an object of the embodiments of the present application is to provide a method, a device and a storage medium for monitoring a fan pitch system, which are capable of considering various pitch structures by identifying a pitch state only by means of pitch motor working condition data collected by a working condition sensor and pitch bearing vibration data collected by an impact vibration sensor without depending on the parameter reading of a fan SCADA system and without being affected by a pitch structure form, and by using the sensor data to determine a pitch operation working condition in real time, the data processing logic is simple, the practicality is high, and the cost is low, thereby solving the above technical problems.
In a first aspect, an embodiment of the present application provides a method for monitoring a fan pitch system, where the method is applied to a monitoring device for monitoring a fan pitch system, and the monitoring device includes: an impact vibration sensor; the method comprises the following steps: obtaining variable-pitch bearing vibration data acquired by an impact vibration sensor; and determining the variable pitch state of the fan variable pitch system based on variable pitch bearing vibration data acquired by the impact vibration sensor.
In the implementation process, the variable pitch state is identified by means of variable pitch bearing vibration data acquired by the impact vibration sensor under the condition that parameters of the SCADA system of the fan are not read, and the variable pitch state is not influenced by a variable pitch structural form, so that variable pitch operation conditions can be judged in real time by means of the sensor data, various variable pitch structures can be considered, and the variable pitch state control system is simple in data processing logic, high in practicality and low in cost.
Optionally, the monitoring device includes: a working condition sensor; the determining the pitch state of the fan pitch system based on the pitch bearing vibration data collected by the impact vibration sensor comprises the following steps: based on motor operation condition data acquired by the condition sensor, identifying a variable pitch steady-state operation stage of the fan variable pitch system; and in the variable-pitch steady-state operation stage, determining the variable-pitch state of the fan variable-pitch system based on variable-pitch bearing vibration data acquired by the impact vibration sensor.
In the implementation process, the variable pitch operation working conditions are collected in real time through the working condition sensor, and the variable pitch bearing vibration data collected by the impact vibration sensor are combined, so that the variable pitch working conditions in a certain fixed duration period can be accurately judged, accurate collection and identification are realized, and the monitoring efficiency is improved.
Optionally, the identifying a variable pitch steady-state operation stage of the fan variable pitch system based on the motor operation condition data collected by the condition sensor includes: calculating the rotating speed or power of the motor based on the motor operation condition data acquired by the condition sensor to acquire a rotating speed or power change trend of the motor; and if the rotating speed or the power change trend of the motor is uniform or uniform acceleration change in a first time period from 90 degrees to an intermediate angle of the blade, and is non-uniform change in a second time period from the intermediate angle to 0 degrees, determining a variable pitch steady-state operation stage of the fan variable pitch system as the first time period.
In the implementation process, the motor rotating speed or power is calculated according to the motor operation condition data, and the time period of the variable-pitch steady-state operation is judged, so that the extraction of the variable-pitch steady-state time is realized, the follow-up accurate determination of the feathering state is facilitated, and the monitoring accuracy is improved.
Optionally, the determining, in the pitch steady-state operation stage, the pitch state of the fan pitch system based on the pitch bearing vibration data collected by the impact vibration sensor includes: in a first time period, calculating the vibration waveform amplitude of the variable-pitch bearing based on the variable-pitch bearing vibration data acquired by the impact vibration sensor; if the amplitude of the vibration waveform is changed from small to large, determining the pitch state of the fan pitch system as a pitch state.
In the implementation process, the vibration waveform amplitude in the steady-state time period is judged, so that the variable-pitch driving state can be rapidly identified, accurate data acquisition and high-efficiency monitoring of the variable-pitch rotating speed and the variable-pitch angle are realized, the cost is low, and the practicability is high.
Optionally, the identifying a variable pitch steady-state operation stage of the fan variable pitch system based on the motor operation condition data collected by the condition sensor includes: calculating the rotating speed or power of the motor based on the motor operation condition data acquired by the condition sensor to acquire a rotating speed or power change trend of the motor; and if the rotating speed or the power change trend of the motor is uniform or uniformly accelerated in a third time period of the change of the blade angle from 0 degrees to 90 degrees, determining a variable-pitch steady-state operation stage of the fan variable-pitch system as the third time period.
In the implementation process, the motor rotating speed or power is calculated according to the motor operation condition data, and the time period of the variable-pitch steady-state operation is judged, so that the extraction of the variable-pitch steady-state time is realized, the follow-up accurate determination of the feathering state is facilitated, and the monitoring accuracy is improved.
Optionally, the determining, in the pitch steady-state operation stage, the pitch state of the fan pitch system based on the pitch bearing vibration data collected by the impact vibration sensor includes: in a third time period, calculating the vibration waveform amplitude of the variable-pitch bearing based on the variable-pitch bearing vibration data acquired by the impact vibration sensor; if the amplitude of the vibration waveform is changed from large to small, the pitch state of the fan pitch system is determined to be a feathering state.
In the implementation process, the vibration waveform amplitude in the steady-state time period is judged, so that the feathering state of the variable propeller can be rapidly identified, the accurate data acquisition and high-efficiency monitoring of the variable propeller rotating speed and the variable propeller angle are realized, the cost is low, and the practicability is high.
Optionally, the determining the pitch state of the fan pitch system based on the pitch bearing vibration data collected by the impact vibration sensor further includes: if the vibration waveform amplitude determined based on the vibration data of the variable pitch bearing is periodically changed in a sine wave form, determining the variable pitch state of the fan variable pitch system as a hub running state; and if the vibration waveform amplitude determined based on the vibration data of the variable-pitch bearing is close to zero, determining the variable-pitch state of the fan variable-pitch system as a stop state.
In the implementation process, the vibration data of the variable-pitch bearing collected by the impact vibration sensor can be used for collecting the vibration data of the variable-pitch state, so that various operation conditions such as hub operation and shutdown of the variable-pitch state can be rapidly identified, the method is simple and rapid, and the practicability and operability are improved.
Optionally, the determining the pitch state of the fan pitch system based on the pitch bearing vibration data collected by the impact vibration sensor includes: and determining the time range of the variable pitch state of the fan variable pitch system based on the vibration waveform amplitude of the variable pitch bearing vibration data.
In the implementation process, when the steady-state operation condition data of the variable-pitch motor cannot be identified, the variable-pitch state is determined by only independently depending on the vibration data acquired by the impact vibration sensor, so that rough estimation of the variable-pitch state is realized, convenience and rapidness are realized, and the practicability of the method is improved.
In a second aspect, an embodiment of the present application provides a monitoring device for monitoring a fan pitch system, the monitoring device comprising: an impact vibration sensor and a controller; the controller is used for acquiring the vibration data of the variable-pitch bearing acquired by the impact vibration sensor; the controller is also used for determining the variable pitch state of the fan variable pitch system based on variable pitch bearing vibration data acquired by the impact vibration sensor.
Optionally, the monitoring device includes: a working condition sensor; the controller is used for identifying a variable pitch steady-state operation stage of the fan variable pitch system based on the motor operation condition data acquired by the condition sensor; the controller is also used for determining the variable pitch state of the fan variable pitch system based on variable pitch bearing vibration data acquired by the impact vibration sensor in the variable pitch steady state operation stage.
Optionally, the controller is used for calculating the rotation speed or the power of the motor based on the motor operation condition data acquired by the condition sensor to obtain the change trend of the rotation speed or the power of the motor; the controller is further configured to determine a steady-state operation stage of the fan pitch system as the first time period if the rotational speed or the power variation trend of the motor is uniform or uniformly accelerated in the first time period from 90 ° to the intermediate angle, and the second time period from the intermediate angle to 0 ° is non-uniform.
Optionally, the controller is configured to calculate, in a first period of time, a vibration waveform amplitude of the pitch bearing based on the pitch bearing vibration data acquired by the impact vibration sensor; and the controller is also used for determining the pitch state of the fan pitch system as a pitch state if the amplitude of the vibration waveform is changed from small to large.
Optionally, the controller is used for calculating the rotation speed or the power of the motor based on the motor operation condition data acquired by the condition sensor to obtain the change trend of the rotation speed or the power of the motor; the controller is further configured to determine a steady-state operation stage of the fan pitch system as a third time period when the rotational speed or the power variation trend of the motor is uniform or uniformly accelerated in the third time period when the blade angle is changed from 0 ° to 90 °.
Optionally, the controller is configured to calculate, in a third period of time, a vibration waveform amplitude of the pitch bearing based on the pitch bearing vibration data acquired by the impact vibration sensor; and the controller is also used for determining the pitch state of the fan pitch system as a feathering state if the amplitude of the vibration waveform is changed from large to small.
Optionally, the controller is configured to determine a pitch state of the fan pitch system as a hub running state if the vibration waveform amplitude determined based on the pitch bearing vibration data changes periodically in a sine wave form; the controller is also used for determining the pitch state of the fan pitch system as a shutdown state if the amplitude of the vibration waveform determined based on the pitch bearing vibration data is close to zero.
Optionally, the controller is configured to determine a time range of a pitch state of the fan pitch system based on a vibration waveform amplitude of the pitch bearing vibration data.
In a third aspect, an embodiment of the present application further provides an electronic device, including: a processor, a memory storing machine-readable instructions executable by the processor, which when executed by the processor perform the steps of the method described above when the electronic device is run.
In a fourth aspect, embodiments of the present application provide a storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method described above.
In order to make the above objects, features and advantages of the present application more comprehensible, embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments of the present application will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and should not be considered as limiting the scope, and other related drawings can be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a flow chart of a monitoring method according to an embodiment of the present application;
fig. 2 is a trend curve of a variable pitch state according to an embodiment of the present application;
FIG. 3 is a waveform diagram of vibration in an open pitch state according to an embodiment of the present application;
fig. 4 is a feathering state change trend curve provided by the embodiment of the application;
FIG. 5 is a waveform diagram of vibration in feathering conditions according to an embodiment of the present application;
FIG. 6 is a schematic block diagram of a monitoring device according to an embodiment of the present application;
fig. 7 is a block schematic diagram of an electronic device according to an embodiment of the present application.
Icon: 210-impact vibration sensor; 220-a controller; 230-working condition sensor; 300-an electronic device; 311-memory; 312-a storage controller; 313-processor; 314-peripheral interface; 315-an input-output unit; 316-display unit.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. The terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element. The terms "first," "second," and the like are used merely to distinguish between descriptions and are not to be construed as indicating or implying relative importance.
Before describing the embodiments of the present application, a brief description will be first made of the technical concept related to the present application.
Fan pitch system motion law: the fan variable pitch structure is mainly a variable pitch bearing, the inner and outer rings of which are respectively connected with the blade root part and the hub, and the fan variable pitch structure is used as a connecting piece for connecting the blade with the hub. And a power driving device (a variable pitch speed reducer or a belt) is added on the inner ring or the outer ring of the variable pitch bearing to drive the inner ring or the outer ring of the variable pitch bearing to rotate, so that the fan blades rotate for a certain angle, and feathering is realized. The variable-pitch bearing mainly comprises an inner ring rotating mode, an outer ring fixing mode, an inner ring fixing mode and an outer ring rotating mode, blades are in two states of pitch opening and feathering, in the switching process of the two states, the variable-pitch bearing is in forward and reverse rotation, namely when the blades are opened, the blade angle is changed from 90 degrees to 0 degrees, and when the blades are feathered, the blade angle is changed from 0 degrees to 90 degrees. The time difference between the opening and feathering is larger, and the opening and feathering states have randomness when the fan operates.
Hub (g ǔ): the hub is a stationary part for connecting the blades to the rotating main shaft, which transfers the loads of the blades to the support structure of the wind turbine, i.e. eventually to the tower. The hub has various types according to the diameter, width, forming mode and materials.
Pitch bearing: the blade is rotatably arranged on the hub, the outer ring of the blade is connected with the hub through bolts, and the inner ring of the blade is connected with the blade. When the wind speed is too high or too low, the attack angle of the air flow to the blades is changed by adjusting the pitch of the blades, so that the aerodynamic torque obtained by the wind generating set is changed, and the power output is kept stable.
Wind farm SCADA system (ULI-SCADA): the built information sharing, exchanging and transmitting platform for each item of monitoring and monitoring data of the wind power plant; aiming at operators, manufacturers and technical research and development units, a remote distributed terminal comprehensive monitoring system is provided; creating a wind farm industry data warehouse; and (5) constructing expert systems for wind resource early-stage specification, evaluation, productivity forecast, wind farm operation management and the like. The functions of the SCADA system of the wind power plant comprise fan real-time monitoring, online data analysis, offline data storage and analysis, report generation and the like.
The inventor notes that three main ways of monitoring the variable pitch condition of the fan exist in the prior art: (1) The rotary direction and speed are identified by the optical pair-tube encoder, and the rotary direction and speed are measured by the incremental encoder. The measuring method is good for counting and counting, both rotary type and linear motion type can be effectively monitored, but the length of the measured object is required to be larger than or close to the installation distance of the two encoders, otherwise, the rising edges and the falling edges of the two encoders cannot be compared, and the direction identification and the rotation speed measurement are invalid. In addition, due to the adoption of photoelectric effect, the requirements on the surface of the object to be tested and the installation environment of the encoder are strict, and the encoder cannot be used in environments with larger vibration. (2) Wind power pitch identification is performed by arranging a pair of Hall switches. The detection device for the pitch direction and the angle of the wind generating set comprises: the device comprises a variable pitch bearing, a proximity switch mounting bracket and Hall proximity switches, wherein the proximity switch mounting bracket is fixed on a hub at a position close to an inner gear ring of the variable pitch bearing, and the two Hall proximity switches are fixed on the proximity switch mounting bracket. The detection method comprises the following steps: a. the two Hall proximity switches are connected into a high-speed counting module of the variable pitch controller 220 through a shielded cable; b. when the pitch is changed, the two Hall proximity switches convert the relative motion between the Hall proximity switches and the inner gear ring of the pitch bearing into a signal similar to square waves; and c, judging and calculating output signals of the Hall proximity switch by the PLC internal program to obtain the direction and the angle of the variable pitch. The two Hall switches are used, so that the triggering distance of the Hall switches is required, the installation distance between the Hall switches is required to be 1.25 times, and certain difficulty is brought to batch use or later maintenance, and more specialized personnel are required to debug. Meanwhile, on the aspects of installation difficulty and maintenance cost: the method has high installation precision in a single device, and different distance adjustment (the wheelbase of two Hall switches) is required to be carried out according to different variable-pitch bearing parameters. (3) pitch identification using redundant encoder configuration. In a pitch system of a large wind generating set, a redundant encoder configuration is generally adopted, an absolute value encoder is arranged on a motor shaft of each pitch generator, and a redundant absolute value encoder for measuring pitch angle is arranged near a pitch bearing. The fan master control receives signals of all encoders, the pitch system only applies signals of the motor tail encoder, and the fan master control only controls the pitch system to apply signals of the redundant encoder when the motor tail encoder fails. When the angle deviation of the two encoders is overlarge, the pitch control system receives the pitch to protect the fan, and the pitch control system is prevented from continuing to operate after the encoders are failed. For variable pitch devices with different structures, such as toothed belt transmission modes and no transmission gear ring, the scheme cannot be carried out, and the scheme can be used only for the form with the gear ring. In view of the above, the embodiment of the application provides a fan pitch system monitoring method, a fan pitch system monitoring device and a storage medium.
Referring to fig. 1, fig. 1 is a flowchart of a fan pitch system monitoring method according to an embodiment of the present application, and the embodiment of the present application is explained in detail below. The method is applied to monitoring equipment for monitoring a fan pitch system, and the monitoring equipment comprises the following steps: an impact vibration sensor 210; the method comprises the following steps: step 100 and step 120.
Step 100: acquiring variable-pitch bearing vibration data acquired by the impact vibration sensor 210;
step 120: based on the pitch bearing vibration data collected by the impact vibration sensor 210, the pitch state of the fan pitch system is determined.
Illustratively, the impact vibration sensor 210 may be: the electronic sensor arranged on the pitch bearing can be specifically arranged at the positions of the inner teeth and the outer teeth of the pitch bearing, so that impact and vibration data during the operation of the pitch bearing can be collected in real time. Because the structural damage of the variable-pitch bearing and the abnormality of the variable-pitch transmission system are related to the variable-pitch bearing operation, accurate acquisition of data in the variable-pitch bearing operation process is required, and an impact vibration integrated sensor is selected for low-speed heavy-load equipment such as the variable-pitch bearing.
Optionally, because the variable-pitch bearing is greatly different from monitoring of other parts of the fan, the variable-pitch bearing belongs to an intermittent motion part, the motion period and the motion time are not fixed, working condition triggering data must be acquired for the variable-pitch bearing monitoring, namely the requirement of data acquisition must be a continuous variable-pitch process with a sufficient time length, and the effective data cannot be acquired in the existing data acquisition mode due to blind acquisition. However, the use of impact vibration sensors 210 provided on the pitch bearing to collect the target data in real time overcomes the above-described drawbacks. Specifically, the variable pitch bearing vibration data collected from the impact vibration sensor 210 processes the varied vibration data, and the variable pitch state in a certain duration period can be accurately determined by intercepting the data in the steady state period and performing amplitude processing and analysis; when the steady-state operation condition data of the pitch motor cannot be identified, amplitude processing and analysis can be directly performed on the obtained vibration data, the pitch state in a certain approximate time period can be roughly estimated and determined according to the amplitude of the vibration waveform, and the approximate starting time and the approximate ending time corresponding to the pitch state are obtained, wherein the approximate starting time is the starting time of the approximate time period, and the approximate ending time is the ending time of the approximate time period. The fan variable pitch operating mode class data may include: the variable pitch direction, the variable pitch rotation speed, the variable pitch angle, the working state of the variable pitch motor and the like can be determined by acquiring vibration data acquired by the impact vibration sensor 210 and analyzing the variable pitch state under the condition of not depending on the parameter reading of the SCADA system of the fan, and can be used as the supplement of working condition signals of fan vibration monitoring of the transmission chain monitoring, the blade monitoring, the tower monitoring and other systems.
The variable pitch state is identified by the variable pitch bearing vibration data acquired by the impact vibration sensor 210 under the condition that the parameters of the SCADA system of the fan are not read, and the variable pitch state is not influenced by the variable pitch structural form, so that the variable pitch operation working condition can be judged in real time by utilizing the sensor data, various variable pitch structures can be considered, the data processing logic is simple, the practicability is high, and the cost is low.
In one embodiment, the monitoring device comprises: a condition sensor 230; step 120 may include: step 121 and step 122.
Step 121: based on motor operation condition data acquired by the condition sensor 230, identifying a variable pitch steady-state operation stage of the fan variable pitch system;
step 122: in a variable-pitch steady-state operation stage, the variable-pitch state of the fan variable-pitch system is determined based on variable-pitch bearing vibration data acquired by the impact vibration sensor 210.
For example, the condition sensor 230 may be: the electronic sensor arranged on the variable pitch motor of the driving blade can monitor the start-stop state of the motor and the running rotating speed of the motor in real time. The fan SCADA system data often comprise data such as a variable pitch state, a variable pitch motor rotating speed, a motor current and the like, but the fan SCADA system data are generally in consideration of fan safety, and the possibility of allowing data to be externally connected is small, so that the working condition sensor 230 can be used for collecting working condition data of the variable pitch motor, and the starting and stopping judgment of the variable pitch motor and the acquisition of steady-state operation data are realized.
Optionally, the monitoring device includes, in addition to the impact vibration sensor 210: the working condition sensor 230 is used for acquiring motor operation working condition data such as the rotating speed, the motor current, the motor power, the start-stop and the like of the variable-pitch motor, and the rotating speed or the power trend can be obviously distinguished into steady-state operation or unsteady-state operation after the rotating speed or the power is calculated. The vibration change data is then processed from the pitch bearing vibration data collected from the impact vibration sensor 210, and the amplitude processing and analysis can be performed by intercepting the vibration data for the steady-state operation period, so that the pitch state in the steady-state operation period can be accurately determined. The variable pitch operation working condition is acquired in real time through the working condition sensor 230, and the variable pitch working condition of a certain fixed duration period can be accurately judged by combining the variable pitch bearing vibration data acquired by the impact vibration sensor 210, so that the accurate acquisition and recognition are realized, and the monitoring efficiency is improved.
In one embodiment, step 121 may include: step 1211 and step 1212.
Step 1211: based on the motor operation condition data acquired by the condition sensor 230, calculating the motor rotation speed or power to obtain a motor rotation speed or power change trend;
Step 1212: if the rotation speed or the power change trend of the motor is uniform or uniform acceleration change in a first time period from 90 degrees to an intermediate angle of the blade, and non-uniform change in a second time period from the intermediate angle to 0 degrees, determining a variable pitch steady-state operation stage of the fan variable pitch system as the first time period.
Illustratively, the intermediate angle may be any one of blade angles in the range of 0 ° to 61 °, such as 0 °, 5 ° … °, 35 ° … °, 59 °, 61 °, and the like. The first time period may be a first turning time period that is experienced when the blade angle is changed from 90 ° to 0 ° throughout to the intermediate angle; the second period of time may be a period of time remaining after the first turning period of time has elapsed throughout the change in blade angle from 90 ° to 0 °.
Alternatively, as shown in fig. 2, the abscissa is time in s and the ordinate is angle in degrees. The working condition sensor 230 is used for acquiring motor operation working condition data such as the rotating speed of the variable-pitch motor, the motor current, the motor power, start-up and shutdown, and the like, and after the rotating speed or the power is calculated, the angle change trend of the blade of the variable-pitch system of the fan with the power of 2MW can be obtained for the doubly-fed wind driven generator in the XX wind power plant as shown in figure 2, and the rotating speed or the power trend can be used for obviously distinguishing whether the motor is in steady-state operation or in unsteady-state operation. The blade angle is changed from 90 degrees to 0 degrees for about 144 seconds in the whole process, the slope of a curve in a first time period of the change of the blade angle from 90 degrees to 30 degrees is a fixed value, the motor rotates at a constant speed in the time period, and the fan runs stably and is in a steady-state running stage; in particular, this period of time is also considered to be in a steady state operating phase if the rotation is evenly accelerated. The slope change of the curve in the second time period from 30 degrees to 0 degrees of the blade angle is irregular, which means that the motor rotates at a non-uniform speed in the time period, the fan speed is not constant, and the fan is in an unstable state operation stage. The motor rotating speed or power is calculated according to the motor operating condition data, and the time period of the variable-pitch steady-state operation is judged, so that the extraction of the variable-pitch steady-state time is realized, the follow-up accurate determination of the feathering state is facilitated, and the monitoring accuracy is improved.
In one embodiment, step 122 may include: step 1221 and step 1222.
Step 1221: in a first time period, calculating the vibration waveform amplitude of the variable-pitch bearing based on the variable-pitch bearing vibration data acquired by the impact vibration sensor 210;
step 1222: if the amplitude of the vibration waveform is changed from small to large, the variable-pitch state of the fan variable-pitch system is determined to be the open-pitch state.
Illustratively, the first time period may be a first turn time period that elapses when the blade angle is changed from 90 ° to 0 ° throughout to the intermediate angle, that is, the steady-state time period determined in step 1212.
Optionally, the pitch bearing can be divided into two running schemes of inner ring rotation, outer ring fixing, inner ring fixing and outer ring rotation, and two states of pitch opening and feathering exist corresponding to the blades, and in the switching process of the two states, the pitch bearing has forward and reverse rotation, namely, when the pitch is opened, the blade angle is changed from 90 degrees to 0 degrees, and when the feathering is performed, the blade angle is changed from 0 degrees to 90 degrees. When the fan operates, the opening and feathering states have randomness. As shown in fig. 2, for the process of pitching, the uniform motion of 60 degrees before pitching is obviously distinguished from the low-speed rotation of 30 degrees of blade angle after pitching, and the continuous steady-state operation stage (first time period) of 60 degrees before pitching can be clearly identified according to the rotating speed trend of the working condition of the motor; as shown in fig. 3, the pitch bearing vibration data collected by the impact vibration sensor 210 during this period is intercepted, and it can be seen that: the variable pitch bearing mainly vibrates by taking the impeller frequency-conversion periodic vibration waveform as a main component, and the vibration amplitude is changed from small to large in the transition stage of the change of the linear to periodic waveform, so that the fan variable pitch system can be identified and determined to be in a variable pitch state. When the blade is opened, the vibration amplitude is larger in the uniform-speed blade opening process at the earlier stage of blade angle change, and the vibration amplitude is lower in the later-stage blade angle fine adjustment. Because the motor working condition sensor needs to monitor the operation working condition of the variable-pitch motor in real time, after the vibration data judges that the pitch is opened, the vibration waveform data conforming to the pitch can be immediately saved, and the vibration data in the steady-state operation stage can be intercepted. Through judging the vibration waveform amplitude of the steady-state time period, the variable-pitch driving state can be rapidly identified, accurate data acquisition and high-efficiency monitoring of the variable-pitch rotating speed and the variable-pitch angle are realized, the cost is low, and the practicability is high.
In one embodiment, step 121 may further include: step 1213 and step 1214.
Step 1213: based on the motor operation condition data acquired by the condition sensor 230, calculating the motor rotation speed or power to obtain a motor rotation speed or power change trend;
step 1214: and if the rotating speed or the power change trend of the motor is uniform or uniformly accelerated in a third time period when the blade angle is changed from 0 to 90 degrees, determining a variable-pitch steady-state operation stage of the fan variable-pitch system as the third time period.
For example, the third time period may be a time period that has elapsed throughout the change in blade angle from 0 ° to 90 °. Alternatively, as shown in fig. 4, the abscissa is time in s and the ordinate is angle in degrees. The working condition sensor 230 is used for acquiring motor operation working condition data such as the rotating speed of the variable-pitch motor, the motor current, the motor power, start-up and shutdown, and the like, and after the rotating speed or the power is calculated, the angle change trend of the blade of the variable-pitch system of the fan with the power of 2MW can be obtained for the doubly-fed wind driven generator in the XX wind power plant as shown in fig. 4, and the rotating speed or the power trend can be used for obviously distinguishing whether the motor is in steady-state operation or in unsteady-state operation. The slope of the curve is maintained at a fixed value basically in the period of the change of the blade angle from 0 to 90 degrees, which means that the motor rotates at a constant speed in the whole period of the change of the blade angle from 0 to 90 degrees, the fan operates stably in a steady-state operation stage, and particularly, the period is considered to be in the steady-state operation stage if the fan rotates at a uniform acceleration. The motor rotating speed or power is calculated according to the motor operating condition data, and the time period of the variable-pitch steady-state operation is judged, so that the extraction of the variable-pitch steady-state time is realized, the follow-up accurate determination of the feathering state is facilitated, and the monitoring accuracy is improved.
In one embodiment, step 122 may include: step 1223 and step 1224.
Step 1223: in a third time period, calculating the vibration waveform amplitude of the variable-pitch bearing based on the variable-pitch bearing vibration data acquired by the impact vibration sensor 210;
step 1224: if the amplitude of the vibration waveform is changed from large to small, the pitch state of the fan pitch system is determined to be a feathering state.
The third time period may be, for example, a time period that has elapsed throughout the change in blade angle from 0 ° to 90 °, i.e., a steady state time period determined in step 1214.
Alternatively, since the blade angle is changed from 90 ° to 0 ° when the blade is pitched, and from 0 ° to 90 ° when feathered, the fan is operated with randomness in the pitched and feathered states. As shown in fig. 4, the whole feathering process is in uniform motion, the motor working condition and rotating speed trend is in steady state operation in a short time, the operating rotating speed is higher, and the continuous steady state operation stage can be clearly identified on the rotating speed trend. As shown in fig. 5, the pitch bearing vibration data collected by the impact vibration sensor 210 during this period is intercepted, and it can be seen that: the change process of the vibration waveforms of the inner ring and the outer ring of the variable-pitch bearing mainly takes the vibration waveform of the impeller in a rotating frequency period as a main vibration waveform when the hub runs, the waveform under the stop has no characteristics after the machine unit stops, the curve approaches to a straight line, the vibration amplitude is reduced from the large value in the transition stage from the periodic waveform to the straight line change, and the fan variable-pitch system can be identified and determined to be in a feathering state. Because the motor working condition sensor needs to monitor the operation working condition of the variable-pitch motor in real time, after the vibration data judges feathering, the vibration waveform data conforming to feathering can be immediately saved, and the vibration data in a steady-state operation stage can be intercepted. Through judging the vibration waveform amplitude of the steady-state time period, the feathering state of the variable propeller can be rapidly identified, accurate data acquisition and high-efficiency monitoring of the variable propeller rotating speed and the variable propeller angle are realized, the cost is low, and the practicability is high.
In one embodiment, step 120 may further comprise: step 1205, and step 1206.
Step 1205: if the vibration waveform amplitude determined based on the vibration data of the variable-pitch bearing is periodically changed in a sine wave form, determining the variable-pitch state of a fan variable-pitch system as a hub running state;
step 1206: and if the amplitude of the vibration waveform determined based on the vibration data of the variable-pitch bearing is close to zero, determining the variable-pitch state of the fan variable-pitch system as a shutdown state.
For example, the vibration data of the variable-pitch bearing are obviously distinguished under different operation conditions of variable-pitch on-feathering, hub operation, shutdown and the like. Because the wind driven generator has the difference of machine type and operation condition, the feathering time has larger uncertainty, the randomness of the variable pitch time leads to the need of changing the data acquisition length, and the same data trend needs to store variable pitch bearing vibration data with different lengths. Optionally, the motor working condition data collected by the working condition sensor 230 is used for calculating the rotation speed or the power, so that the steady-state operation stage of the variable pitch can be identified and determined, the first 60 ° of the pitch process shown in fig. 2 can be preferentially selected as the steady-state operation stage, and the whole feathering process shown in fig. 4 can be integrally determined as the steady-state operation stage. For both vibration waveforms shown in fig. 3 and 5, during operation of the hub, the vibration waveforms are mainly sinusoidal waves at the rotation frequency interval of the impeller, the vibration waveform amplitude is close to 0 when the hub is stopped, and the curve approaches to a straight line.
By utilizing the vibration data of the variable-pitch bearing collected by the impact vibration sensor 210, the vibration data collection of the variable-pitch state can be realized, and various operation conditions such as hub operation, shutdown and the like of the variable-pitch state can be rapidly identified.
In one embodiment, step 120 may further comprise: step 123.
Step 123: and determining the time range of the variable pitch state of the fan variable pitch system based on the vibration waveform amplitude of the variable pitch bearing vibration data.
Illustratively, the method achieves rough pitch condition monitoring by employing a pitch drive system triggered by individual vibration data. Because the condition that the working condition data of the variable pitch motor is triggered and collected to be invalid exists, under the condition that no trigger exists, the characteristic that vibration data collected by the impact vibration sensor 210 have significant differences in different states such as a feathering state, a machine unit shutdown period, a hub operation period and the like can be utilized as a condition for simply judging the feathering and feathering operation data to be disconnected. The variable pitch bearing vibration data collected from the impact vibration sensor 210 is processed and the vibration waveform is continuously determined, and a rough estimate can be made based on the amplitude of the vibration waveform. If the amplitude of the vibration waveform changes in a sine wave form, determining the time period as a hub operation stage; if the amplitude is changed by sine waves and gradually becomes smaller from large to small, the time period can be determined to be feathering; if the amplitude approaches 0 basic without change, determining the time period as a machine unit shutdown stage; if the amplitude value approaches 0 and gradually becomes larger from smaller, the time period can be determined to be the opening of the propeller. However, this method can determine the approximate start time (start time of the period) and the approximate end time (end time of the period) only from the period in which the pitch state is present by the change in the amplitude of the vibration waveform. When the steady-state operation condition data of the variable-pitch motor cannot be identified, the variable-pitch state is determined by only independently depending on the vibration data acquired by the impact vibration sensor 210, so that rough estimation of the variable-pitch state is realized, convenience and rapidness are realized, and the practicability of the method is improved.
Referring to fig. 6, fig. 6 is a schematic block diagram of a monitoring device according to an embodiment of the application. The apparatus includes an impact vibration sensor 210 and a controller 220.
The controller 220 is configured to obtain the vibration data of the pitch bearing collected by the impact vibration sensor 210;
the controller 220 is further configured to determine a pitch state of the fan pitch system based on the pitch bearing vibration data collected by the impact vibration sensor 210.
Optionally, the monitoring device comprises: a condition sensor 230;
the controller 220 is configured to identify a variable pitch steady-state operation stage of the fan variable pitch system based on the motor operation condition data collected by the condition sensor 230;
the controller 220 is further configured to determine, during the steady-state operation phase of variable pitch, a variable pitch state of the fan variable pitch system based on variable pitch bearing vibration data acquired by the impact vibration sensor 210.
Optionally, the controller 220 is configured to calculate a motor rotation speed or power based on the motor operation condition data collected by the condition sensor 230, so as to obtain a motor rotation speed or power variation trend;
the controller 220 is further configured to determine a steady-state operation stage of the fan pitch system as the first time period if the rotational speed or the power variation trend of the motor is changed at a constant speed or a uniform acceleration in the first time period from 90 ° to an intermediate angle, and the second time period from the intermediate angle to 0 ° is changed at a non-constant speed.
Optionally, the controller 220 is configured to calculate, during a first period of time, a vibration waveform amplitude of the pitch bearing based on the pitch bearing vibration data acquired by the impact vibration sensor 210;
the controller 220 is further configured to determine a pitch state of the fan pitch system as an open state if the amplitude of the vibration waveform is changed from small to large.
Optionally, the controller 220 is configured to calculate a motor rotation speed or power based on the motor operation condition data collected by the condition sensor 230, so as to obtain a motor rotation speed or power variation trend;
the controller 220 is further configured to determine a steady-state operation stage of the fan pitch system as a third time period when the rotational speed variation trend of the motor is uniform or uniformly accelerated in the third time period when the blade angle varies from 0 ° to 90 °.
Optionally, the controller 220 is configured to calculate, during a third period of time, a vibration waveform amplitude of the pitch bearing based on the pitch bearing vibration data acquired by the impact vibration sensor 210;
the controller 220 is further configured to determine a pitch state of the fan pitch system as a feathering state if the amplitude of the vibration waveform is reduced from large to small.
Optionally, the controller 220 is configured to determine a pitch state of the fan pitch system as a hub running state if the vibration waveform amplitude determined based on the pitch bearing vibration data is periodically changed in a sine wave form;
the controller 220 is further configured to determine a pitch state of the fan pitch system as a shutdown state if a vibration waveform amplitude determined based on the pitch bearing vibration data is near zero.
Optionally, the controller 220 is configured to determine a time range of a pitch state of the fan pitch system based on a vibration waveform amplitude of the pitch bearing vibration data.
Referring to fig. 7, fig. 7 is a block schematic diagram of an electronic device. The electronic device 300 may include a memory 311, a memory controller 312, a processor 313, a peripheral interface 314, an input output unit 315, a display unit 316. It will be appreciated by those of ordinary skill in the art that the configuration shown in fig. 7 is merely illustrative and is not intended to limit the configuration of the electronic device 300. For example, electronic device 300 may also include more or fewer components than shown in FIG. 7, or have a different configuration than shown in FIG. 7.
The above-mentioned memory 311, memory controller 312, processor 313, peripheral interface 314, input/output unit 315, and display unit 316 are electrically connected directly or indirectly to each other to realize data transmission or interaction. For example, the components may be electrically connected to each other via one or more communication buses or signal lines. The processor 313 is used to execute executable modules stored in the memory.
The Memory 311 may be, but is not limited to, a random access Memory (Random Access Memory, RAM), a Read Only Memory (ROM), a programmable Read Only Memory (Programmable Read-Only Memory, PROM), an erasable Read Only Memory (Erasable Programmable Read-Only Memory, EPROM), an electrically erasable Read Only Memory (Electric Erasable Programmable Read-Only Memory, EEPROM), etc. The memory 311 is configured to store a program, and the processor 313 executes the program after receiving an execution instruction, and a method executed by the electronic device 300 defined by the process disclosed in any embodiment of the present application may be applied to the processor 313 or implemented by the processor 313.
The processor 313 may be an integrated circuit chip having signal processing capabilities. The processor 313 may be a general-purpose processor, including a central processing unit (Central Processing Unit, CPU), a network processor (Network Processor, NP), etc.; but also digital signal processors (digital signal processor, DSP for short), application specific integrated circuits (Application Specific Integrated Circuit, ASIC for short), field Programmable Gate Arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components. The disclosed methods, steps, and logic blocks in the embodiments of the present application may be implemented or performed. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The peripheral interface 314 couples various input/output devices to the processor 313 and the memory 311. In some embodiments, the peripheral interface 314, the processor 313, and the memory controller 312 may be implemented in a single chip. In other examples, they may be implemented by separate chips.
The input/output unit 315 is used for providing input data to a user. The input/output unit 315 may be, but is not limited to, a mouse, a keyboard, and the like.
The display unit 316 provides an interactive interface (e.g., a user interface) between the electronic device 300 and a user for reference. In this embodiment, the display unit 316 may be a liquid crystal display or a touch display. The liquid crystal display or the touch display may display a process of executing the program by the processor.
The electronic device 300 in this embodiment may be used to perform each step in each method provided in the embodiment of the present application.
Furthermore, the embodiment of the application also provides a storage medium, and a computer program is stored on the storage medium, and the computer program executes the steps in the embodiment of the method when being executed by a processor.
The computer program product of the above method according to the embodiment of the present application includes a storage medium storing program codes, where the instructions included in the program codes may be used to execute the steps in the above method embodiment, and specifically, reference may be made to the above method embodiment, which is not repeated herein.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, and the division of the modules is merely a logical function division, and there may be additional divisions when actually implemented, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form. The functional modules in the embodiment of the application can be integrated together to form a single part, or each module can exist alone, or two or more modules can be integrated to form a single part.
It should be noted that the functions, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a server, a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM) random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.
The above description is only an example of the present application and is not intended to limit the scope of the present application, and various modifications and variations will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.
Claims (17)
1. A method for monitoring a fan pitch system, the method being applied to a monitoring device for monitoring a fan pitch system, the monitoring device comprising: an impact vibration sensor; the method comprises the following steps:
obtaining variable-pitch bearing vibration data acquired by an impact vibration sensor;
and determining the variable pitch state of the fan variable pitch system based on variable pitch bearing vibration data acquired by the impact vibration sensor.
2. The method of claim 1, wherein the monitoring device further comprises: a working condition sensor; the determining the pitch state of the fan pitch system based on the pitch bearing vibration data collected by the impact vibration sensor comprises the following steps:
based on motor operation condition data acquired by the condition sensor, identifying a variable pitch steady-state operation stage of the fan variable pitch system;
And in the variable-pitch steady-state operation stage, determining the variable-pitch state of the fan variable-pitch system based on variable-pitch bearing vibration data acquired by the impact vibration sensor.
3. The method of claim 2, wherein the identifying a pitch steady-state operating phase of the fan pitch system based on motor operating condition data collected by the condition sensor comprises:
calculating the rotating speed or power of the motor based on the motor operation condition data acquired by the condition sensor to acquire a rotating speed or power change trend of the motor;
and if the rotating speed or the power change trend of the motor is uniform or uniform acceleration change in a first time period from 90 degrees to an intermediate angle of the blade, and is non-uniform change in a second time period from the intermediate angle to 0 degrees, determining a variable pitch steady-state operation stage of the fan variable pitch system as the first time period.
4. A method according to claim 3, wherein said determining a pitch state of the fan pitch system based on pitch bearing vibration data acquired by the impact vibration sensor during the pitch steady state operation phase comprises:
in a first time period, calculating the vibration waveform amplitude of the variable-pitch bearing based on the variable-pitch bearing vibration data acquired by the impact vibration sensor;
If the amplitude of the vibration waveform is changed from small to large, determining the pitch state of the fan pitch system as a pitch state.
5. The method of claim 2, wherein the identifying a pitch steady-state operating phase of the fan pitch system based on motor operating condition data collected by the condition sensor comprises:
calculating the rotating speed or power of the motor based on the motor operation condition data acquired by the condition sensor to acquire a rotating speed or power change trend of the motor;
and if the rotating speed or the power change trend of the motor is uniform or uniformly accelerated in a third time period of the change of the blade angle from 0 degrees to 90 degrees, determining a variable-pitch steady-state operation stage of the fan variable-pitch system as the third time period.
6. The method of claim 5, wherein determining a pitch state of the fan pitch system based on pitch bearing vibration data acquired by the impact vibration sensor during the pitch steady state operation phase comprises:
in a third time period, calculating the vibration waveform amplitude of the variable-pitch bearing based on the variable-pitch bearing vibration data acquired by the impact vibration sensor;
If the amplitude of the vibration waveform is changed from large to small, the pitch state of the fan pitch system is determined to be a feathering state.
7. The method of claim 1, wherein the determining the pitch state of the fan pitch system based on the pitch bearing vibration data acquired by the impact vibration sensor further comprises:
if the vibration waveform amplitude determined based on the vibration data of the variable pitch bearing is periodically changed in a sine wave form, determining the variable pitch state of the fan variable pitch system as a hub running state;
and if the vibration waveform amplitude determined based on the vibration data of the variable-pitch bearing is close to zero, determining the variable-pitch state of the fan variable-pitch system as a stop state.
8. The method of claim 1, wherein the determining a pitch state of the fan pitch system based on pitch bearing vibration data acquired by the impact vibration sensor comprises:
and determining the time range of the variable pitch state of the fan variable pitch system based on the vibration waveform amplitude of the variable pitch bearing vibration data.
9. A monitoring device for monitoring a fan pitch system, the monitoring device comprising: an impact vibration sensor and a controller;
The controller is used for acquiring the vibration data of the variable-pitch bearing acquired by the impact vibration sensor;
the controller is also used for determining the variable pitch state of the fan variable pitch system based on variable pitch bearing vibration data acquired by the impact vibration sensor.
10. The apparatus of claim 9, wherein the monitoring apparatus further comprises: a working condition sensor;
the controller is used for identifying a variable pitch steady-state operation stage of the fan variable pitch system based on the motor operation condition data acquired by the condition sensor;
the controller is also used for determining the variable pitch state of the fan variable pitch system based on variable pitch bearing vibration data acquired by the impact vibration sensor in the variable pitch steady state operation stage.
11. The device of claim 10, wherein the controller is configured to calculate a motor speed or power based on motor operation condition data collected by the condition sensor, to obtain a motor speed or power trend;
the controller is further configured to determine a steady-state operation stage of the fan pitch system as the first time period if the rotational speed or the power variation trend of the motor is uniform or uniformly accelerated in the first time period from 90 ° to the intermediate angle, and the second time period from the intermediate angle to 0 ° is non-uniform.
12. The apparatus of claim 11, wherein the controller is configured to calculate a vibration waveform amplitude of the pitch bearing based on the pitch bearing vibration data acquired by the impact vibration sensor during a first time period;
and the controller is also used for determining the pitch state of the fan pitch system as a pitch state if the amplitude of the vibration waveform is changed from small to large.
13. The device of claim 10, wherein the controller is configured to calculate a motor speed or power based on motor operation condition data collected by the condition sensor, to obtain a motor speed or power trend;
the controller is further configured to determine a steady-state operation stage of the fan pitch system as a third time period when the rotational speed or the power variation trend of the motor is uniform or uniformly accelerated in the third time period when the blade angle is changed from 0 ° to 90 °.
14. The apparatus of claim 13, wherein the controller is configured to calculate a vibration waveform amplitude of the pitch bearing based on the pitch bearing vibration data acquired by the impact vibration sensor during a third time period;
And the controller is also used for determining the pitch state of the fan pitch system as a feathering state if the amplitude of the vibration waveform is changed from large to small.
15. The apparatus of claim 9, wherein the controller is configured to determine a pitch state of the fan pitch system as a hub operational state if a vibration waveform amplitude determined based on the pitch bearing vibration data varies periodically in a sine wave manner;
the controller is also used for determining the pitch state of the fan pitch system as a shutdown state if the amplitude of the vibration waveform determined based on the pitch bearing vibration data is close to zero.
16. The apparatus of claim 9, wherein the controller is configured to determine a time range of a pitch state of the fan pitch system based on a vibration waveform amplitude of pitch bearing vibration data.
17. A storage medium having stored thereon a computer program which, when executed by a processor, performs the steps of the method according to any of claims 1 to 8.
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| CN117685179B (en) * | 2024-01-31 | 2024-04-19 | 安徽容知日新科技股份有限公司 | Fan variable pitch system monitoring method, monitoring equipment and storage medium |
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| Title |
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| 高原型风力发电机组的变桨控制;林志明等;东方汽轮机(第3期);第33-40页 * |
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| Publication number | Publication date |
|---|---|
| CN116428130A (en) | 2023-07-14 |
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