CN211979670U - Wind turbine generator system tower accumulated fatigue damage assessment system - Google Patents
Wind turbine generator system tower accumulated fatigue damage assessment system Download PDFInfo
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- CN211979670U CN211979670U CN202020457072.XU CN202020457072U CN211979670U CN 211979670 U CN211979670 U CN 211979670U CN 202020457072 U CN202020457072 U CN 202020457072U CN 211979670 U CN211979670 U CN 211979670U
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Abstract
The utility model discloses a wind turbine generator system pylon accumulation fatigue damage evaluation system, including consecutive sensor, data acquisition station, CPU and radio signal transmitter, CPU links to each other with audible-visual annunciator, power respectively, radio signal transmitter and the long-range wireless connection in terminal. According to the technical scheme, the sensor is used for acquiring information such as acceleration and a tower shaking angle, and the accumulated fatigue damage value of each region in the circumferential direction of the wind turbine tower is evaluated on line in real time, so that the residual life of the wind turbine tower is estimated, load data borne by the wind turbine tower is measured on line for a long time, and the method has the advantages of convenience in construction, low cost and convenience in maintenance.
Description
Technical Field
The utility model relates to a wind power generation field especially relates to a wind turbine generator system pylon accumulation fatigue damage evaluation system.
Background
Along with the great increase of the loading amount of the wind generating set, a high-quality wind resource area is developed, and in order to better develop and utilize wind power resources in a low wind speed area, namely, almost all wind resources, wind power generation developers and complete machine manufacturers invest a great amount of scientific research and development efforts to develop high towers, even ultrahigh towers, flexible towers and steel-concrete mixed towers.
With the continuous input and operation of high towers, ultrahigh towers, flexible towers and steel-concrete hybrid towers, the health state of the tower structure of the wind turbine generator gradually becomes the focus of industrial attention. Wind turbine towers are also gradually developed until the hub height reaches or even exceeds 160 meters, and the influence of wind load on the wind turbine towers is more obvious. Wind loads can force the wind turbine tower to cause fatigue damage and even collapse.
In order to avoid the above situations, the existing verification method is to paste a strain gauge at a specific position on the wind turbine tower to obtain the actual load on the wind turbine during operation, and then obtain the actual fatigue damage value of the wind turbine tower for the collected load by using a rain flow counting method and an accumulated fatigue damage rule. The method has the disadvantages that the test method based on the strain gauge can only acquire short-term data of the actual operation load of the wind turbine generator, and the test scheme has the problems of inconvenient construction, high cost, difficult maintenance and the like.
Chinese patent document CN110895621A discloses a method and apparatus for determining fatigue damage of tower circumferential weld of wind turbine generator. The method comprises the following steps: calculating the stress of the section of the tower frame circumferential weld under the action of preset unit loads in different directions; extracting fatigue time sequence loads in each direction of the different directions under a preset working condition; projecting the fatigue time sequence load in each direction in the circumferential direction of the tower to obtain a projection sequence load corresponding to the fatigue time sequence load in each direction; channel combination is carried out on the stress and the projection sequence load to obtain a stress time history; and determining the fatigue damage of the section of the tower circumferential weld in the circumferential direction of the tower based on the stress time history and the preset load working condition frequency table. According to the technical scheme, only short-term data of the actual operation load of the wind turbine generator can be acquired, and the test scheme has the defects of inconvenience in construction, high cost, difficulty in maintenance and the like.
Disclosure of Invention
The utility model discloses mainly solve the technical problem of the unable actual feedback wind turbine generator system pylon load that receives of original technical scheme, a wind turbine generator system pylon accumulative fatigue damage evaluation system is provided, gather the acceleration through the sensor, the pylon rocks information such as angle, each regional accumulative fatigue damage value of wind turbine generator system pylon circumferencial direction is aassected on line in real time, thereby predict the remaining life of wind turbine generator system pylon, record the load data that the wind turbine generator system pylon bore on line for a long time, and possess construction convenience, low cost and maintain convenient advantage.
The above technical problem of the present invention can be solved by the following technical solutions: the utility model discloses a consecutive sensor, data acquisition station, CPU and radio signal transmitter, CPU links to each other with audible-visual annunciator, power respectively, radio signal transmitter and the long-range wireless connection in terminal. The sensor collects information such as acceleration and tower shaking angle, the collected information is collected and transmitted to the CPU through the data collection station, the CPU comprises upper computer analysis software, the accumulated fatigue damage value of the tower is analyzed and calculated through the upper computer analysis software, the residual life is predicted, the analysis result is sent to the terminal through the wireless signal transmitter, the analysis result is checked by workers in real time, energy is provided by the power supply, and if the data are severely fluctuated or lost, the audible and visual alarm gives an alarm.
Preferably, the tower is uniformly provided with a plurality of sections from top to bottom, and each section is provided with a plurality of groups of sensors. The combined action of multiple groups of sensors on multiple sections ensures that the tower is stressed and shakes in an all-around real-time monitoring manner.
Preferably, the sensors include an acceleration sensor disposed at an edge of the cross section and a dual-axis tilt sensor disposed at a center of the cross section. The acceleration sensor is arranged at the edge of the interface and is used for measuring, the double-shaft tilt sensor is arranged at the center of the cross section, and tilt angle data are acquired by comparing the central axis of the tower.
Preferably, the installation positions of the dual-axis tilt sensor are as follows: the positive value of the x-axis output angle of the double-axis inclination angle sensor points to the north, and the azimuth angle is 0 degree; the negative value of the output angle of the x axis points to the south, and the azimuth angle is 180 degrees; the positive value of the output angle of the y axis points to the east, and the azimuth angle is 90 degrees; the negative y-axis output angle points west with an azimuth of 270. And a double-shaft tilt angle sensor is installed according to the specification, and azimuth data are collected according to the format, so that the data are convenient to count and calculate.
Preferably, the data acquisition station is arranged in the middle of the tower, the audible and visual alarms are arranged on two sides of the middle of the tower, and the CPU, the power supply and the wireless signal transmitter are arranged on the data acquisition station. The data acquisition station is installed and is convenient for receive the signal that the sensor gathered in the middle part of the pylon, and the audible-visual alarm is installed and is convenient for the staff to receive audible-visual signal in the middle part both sides of pylon, and CPU, power, wireless signal transmitter and data acquisition station are integrated, are convenient for install.
Preferably, the terminal is a PC terminal or a handheld device. The staff can receive the signal at the control center or on site through a handheld device.
The utility model has the advantages that: the method has the advantages that the acceleration, the tower shaking angle and other information are collected through the sensor, the accumulated fatigue damage value of each area in the circumferential direction of the wind turbine tower is estimated on line in real time, the residual life of the wind turbine tower is estimated, load data borne by the wind turbine tower is measured on line for a long time, and the method is convenient to construct, low in cost and convenient to maintain.
Drawings
Fig. 1 is a schematic circuit connection structure diagram of the present invention.
FIG. 2 is a diagram of the stress condition of the wind turbine tower and the layout of the sensors according to the present invention.
FIG. 3 is a diagram of a method for determining azimuth angles of cumulative fatigue damage of a tower according to the present invention.
In the figure, a sensor 1, an acceleration sensor 1.1, a double-shaft tilt sensor 1.2, a data acquisition station 2, a CPU3, a power supply 4, an audible and visual alarm 5, a wireless signal transmitter 6 and a terminal 7 are arranged.
Detailed Description
The technical solution of the present invention is further specifically described below by way of examples and with reference to the accompanying drawings.
Example (b): the wind turbine generator system tower accumulated fatigue damage assessment system comprises a sensor 1, a data acquisition station 2, a CPU3 and a wireless signal transmitter 6 which are sequentially connected, wherein the CPU is respectively connected with an audible and visual alarm 5 and a power supply 4, and the wireless signal transmitter is remotely and wirelessly connected with a terminal 7. The terminal is a PC terminal or a handheld device, and a worker can receive signals at a control center or on site through the handheld device. The data acquisition station is arranged in the middle of the tower and is convenient to receive signals acquired by the sensor. The audible and visual alarm is arranged on two sides of the middle part of the tower, so that workers can receive audible and visual signals conveniently. CPU, power and wireless signal transmitter establish on the data acquisition station, and CPU, power, wireless signal transmitter and data acquisition station are integrated, are convenient for install.
A plurality of sections are uniformly arranged on the tower from top to bottom, a plurality of groups of sensors are arranged on each section, and the multiple groups of sensors on the sections jointly act to ensure that the tower is stressed and shakes in an all-around real-time monitoring manner. The sensor comprises an acceleration sensor 1.1 and a double-shaft inclination angle sensor 1.2, wherein the acceleration sensor 1.1 is arranged at the edge of a section, the double-shaft inclination angle sensor 1.2 is arranged at the center of the section, the acceleration sensor is arranged at the edge of an interface and measures the angle, the double-shaft inclination angle sensor is arranged at the center of the section, and inclination angle data are acquired by comparing the central axis of the tower. The installation positions of the double-shaft tilt angle sensor are as follows: the positive value of the x-axis output angle of the double-axis inclination angle sensor points to the north, and the azimuth angle is 0 degree; the negative value of the output angle of the x axis points to the south, and the azimuth angle is 180 degrees; the positive value of the output angle of the y axis points to the east, and the azimuth angle is 90 degrees; the negative y-axis output angle points west with an azimuth of 270. And a double-shaft tilt angle sensor is installed according to the specification, and azimuth data are collected according to the format, so that the data are convenient to count and calculate.
During operation, the sensor gathers acceleration, and the pylon rocks information such as angle, and the information of gathering gathers and transmits CPU through the data acquisition station, includes host computer analysis software in the CPU, through host computer analysis software analysis and calculation pylon accumulative fatigue damage value and foresee the remaining life, sends the analysis result to the terminal through wireless transmitter, looks over in real time by the staff, provides the energy by the power, if data appear violent fluctuation or disappearance, audible-visual annunciator reports to the police.
The evaluation method of the system comprises the following steps:
1, the wind turbine tower is divided into p areas along the circumference, and p is more than or equal to 1.
2, uniformly distributing ii or more than or equal to 1 group of sensors at the position of a specific section on the whole H height of the Tower of the wind turbine generator through a Tower S.H.M. system, and measuring the shaking angles theta of the x axis and the y axis generated by different measured section positions when the measured section of the Tower bears the load in real time on linex、θyAnd an acceleration a.
3, calculating the angle synthesis, and obtaining the calculation formula of the maximum inclination angle of each azimuth of the multi-section through the angle synthesis
Sin2θCombination of Chinese herbs＝Sin2θx+Sin2θy，
Namely, it is
And is converted by the azimuth angle
Namely, the azimuth angle corresponding to the maximum inclination angle generated by the loaded and swayed tower frame can be known
4, calculating the displacement variation of the tower section;
the measured i sections of the wind turbine tower are respectively and uniformly divided into n directions, and the included angle between each direction is the included angle
Obtaining the corresponding maximum inclination angle theta of a plurality of sections in real timeCombination of Chinese herbsDifferent directions in each section correspond to the inclination angles
Where μ is the corresponding number μ 1, 2, 3 … n in the n orientations.
Obtaining the maximum inclination angle theta of each azimuth of the multi-section through angle synthesisCombination of Chinese herbsThe inclination angle theta corresponding to different directions in each section is defined by x-K thetaArc degreeThe displacement deformation x of each position in the measured section of the tower can be obtained, wherein K is the proportional coefficient of the displacement and the corner of the tower top, and thetaArc degreeThe camber values for a plurality of azimuthal inclination angles in each section.
By x ═ K θArc degreeObtaining the displacement deformation x and K of each position in the measured section of the tower as the tower top displacement omegamaxThe proportional coefficient of the rotating angle alpha of the tower top,
to know
Thereby obtaining
Wherein L is1Height H of cross section for arranging sensor on toweri。
5, calculating the stress of each direction in the tower section:
F＝Fk+Fc+Fm，
the method comprises the following steps that Fk is kx, k is a rigidity coefficient of a wind turbine tower, and x is displacement deformation of each position in a measured section of the tower;
Fc＝cv，
c is the tower damping coefficient;
Fm＝ma，
m is the modal mass of the tower; wherein the damping coefficient c of Fc is about 2 per mill, so the Fc value is very small and can be ignored,
i.e., M ═ F · L ═ (kx + ma) · H — Hi。
6, calculating the accumulated fatigue value of each area in the circumferential direction of the Tower, and monitoring in real time through a Tower S.H.M. system to obtain the load M of different directions corresponding to a plurality of sections of the Tower of the wind turbine generatori,ni is the number i of the sections not less than 1, n is the number n of the azimuths evenly divided in the circumferential direction of each section not less than 1
The stress amplitude sigma is obtainedi,nThe timing chart j is 1, 2, 3 … n. The equivalent stress amplitude sigma of a plurality of azimuths of each section can be obtained by a rain flow counting methodrjj is 1, 2, 3 … m and corresponding cycle number nrjj＝1、2、3…m。
Fatigue damage equivalent stress amplitude sigma of each sectionrjObtaining corresponding allowable cycle number Nj through an S-N curve of tower materials of the wind turbine generator, wherein the allowable cycle number Nj is obtained through a formula
And m is not less than 1 and is an integer, so that the accumulated fatigue damage values Di, n of the wind turbine generator tower in multiple directions of each section can be measured in real time.
7, measuring the accumulated fatigue damage values Di, n of n directions uniformly divided by taking the maximum inclination angle as a starting point in the circumferential direction and taking the maximum inclination angle as a starting point in real time on line, and corresponding azimuth angles gammai,nAccording to the corresponding gammai,nAnd obtaining cumulative fatigue damage values Di of the measured multi-section of the wind turbine tower corresponding to a plurality of azimuths, obtaining cumulative fatigue loss values Dp of n in p circumferential regions, and obtaining a maximum value Dr in the Dp and an azimuth angle gamma corresponding to the maximum value Dr. And finishing the on-line evaluation of the accumulated fatigue damage of the wind turbine tower and the corresponding azimuth gamma according to the accumulated fatigue damage Dr value measured on line, and estimating the residual life of the wind turbine tower.
Claims (3)
1. The utility model provides a wind turbine generator system pylon accumulation fatigue damage evaluation system, its characterized in that, includes consecutive sensor (1), data acquisition station (2), CPU (3) and wireless transmitter (6), CPU links to each other with audible-visual annunciator (5), power (4) respectively, wireless transmitter and terminal (7) long-range wireless connection evenly are equipped with a plurality of cross-sections with pylon top-down, be provided with a plurality of groups of sensors on every cross-section, the sensor includes acceleration sensor (1.1) and biax angular transducer (1.2), and acceleration sensor (1.1) sets up at the cross-section edge, and biax angular transducer (1.2) set up in cross-section center department, biax angular transducer's mounted position does: the positive value of the x-axis output angle of the double-axis inclination angle sensor points to the north, and the azimuth angle is 0 degree; the negative value of the output angle of the x axis points to the south, and the azimuth angle is 180 degrees; the positive value of the output angle of the y axis points to the east, and the azimuth angle is 90 degrees; the negative y-axis output angle points west with an azimuth of 270.
2. The wind turbine tower accumulated fatigue damage assessment system according to claim 1, wherein the data acquisition station is installed in the middle of the tower, the audible and visual alarm is installed on two sides of the middle of the tower, and the CPU, the power supply and the wireless signal transmitter are arranged on the data acquisition station.
3. The system for evaluating the accumulated fatigue damage of the wind turbine tower according to claim 1, wherein the terminal is a PC terminal or a handheld device.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112796953A (en) * | 2021-02-01 | 2021-05-14 | 中国华能集团清洁能源技术研究院有限公司 | Method, system, equipment and storage medium for predicting service life of tower of wind turbine generator |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112796953A (en) * | 2021-02-01 | 2021-05-14 | 中国华能集团清洁能源技术研究院有限公司 | Method, system, equipment and storage medium for predicting service life of tower of wind turbine generator |
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