CN107514344A - Tower hoisting method of wind generating set and vortex-induced vibration monitoring system - Google Patents

Tower hoisting method of wind generating set and vortex-induced vibration monitoring system Download PDF

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Publication number
CN107514344A
CN107514344A CN201710669695.6A CN201710669695A CN107514344A CN 107514344 A CN107514344 A CN 107514344A CN 201710669695 A CN201710669695 A CN 201710669695A CN 107514344 A CN107514344 A CN 107514344A
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tower
vortex
frequency
hoisting
sections
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Chinese (zh)
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张晓曼
邢赢
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Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
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Beijing Goldwind Science and Creation Windpower Equipment Co Ltd
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Priority to CN201710669695.6A priority Critical patent/CN107514344A/en
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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
    • F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
    • F03D13/20—Arrangements for mounting or supporting wind motors; Masts or towers for wind motors
    • 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
    • F03D13/00—Assembly, mounting or commissioning of wind motors; Arrangements specially adapted for transporting wind motor components
    • F03D13/10—Assembly of wind motors; Arrangements for erecting wind motors
    • 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
    • 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
    • F03D80/00—Details, components or accessories not provided for in groups F03D1/00 - F03D17/00
    • 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
    • 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
    • Y02E10/728—Onshore wind turbines

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  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Sustainable Development (AREA)
  • Sustainable Energy (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Wind Motors (AREA)

Abstract

The invention provides a tower hoisting method of a wind generating set and a vortex-induced vibration monitoring system. The tower frame comprises N sections of tower barrels, N is a natural number greater than 3, and the tower frame hoisting method comprises the following steps: hoisting the first to the Nth sections of tower barrels in sequence; after the first to the a-th sections of tower drums are hoisted, detecting the vibration frequency of the tower in the lifting force direction formed by the first to the a-th sections of tower drums; predicting a first vortex shedding frequency of the tower after the hoisting of the Nth section of tower drum is finished based on the vibration frequency in the lifting direction of the tower, and judging whether the first vortex shedding frequency meets a preset condition; and if the preset conditions are met, determining that the vortex-induced vibration suppression devices are respectively installed on the (a + 1) th to nth tower barrels when the (a + 1) th to nth tower barrels are hoisted. Therefore, the vortex shedding frequency of the tower after hoisting can be predicted according to the actual stress condition of the tower on the hoisting site, so that the installation time of the vortex-induced vibration suppression device can be accurately judged, and the aims of avoiding influencing the structural strength of the tower and the hoisting progress of the tower are fulfilled.

Description

Tower hoisting method of wind generating set and vortex-induced vibration monitoring system
Technical Field
The invention relates to the technical field of wind power generation, in particular to a tower hoisting method and a vortex-induced vibration monitoring system of a wind generating set.
Background
The tower is an important component in the wind generating set, and bears the weight of the whole engine room and the impeller set, and the tower in most wind generating sets is formed by sequentially overlapping a plurality of towers, so that the structural strength and the stability after the towers are connected in a hoisting mode are particularly important.
However, in the process of hoisting the tower, especially when hoisting the high tower and the flexible tower to a certain height, the tower may be affected by the wind force, so that the tower may generate a large-scale periodic vibration, one of which is a vortex-induced vibration. After vortex-induced vibration occurs, on one hand, the connection stability among a plurality of tower drums during tower hoisting can be influenced, namely, the structural strength, particularly the fatigue strength, of the hoisted tower is influenced, and the fatigue damage of the tower is increased. On the other hand, the hoisting progress of the whole wind generating set is influenced, and manpower, material resources and financial resources are wasted. Therefore, when the tower vibrates to a certain frequency range, the vortex-induced vibration suppression device is timely installed on the tower barrel needing to be installed, and vortex-induced vibration under the action of wind excitation after the tower is hoisted is avoided.
At present, a method for determining the installation position of a vortex-induced vibration suppression device in a hoisting process is to apply wind excitation to a tower by using a simulation model method to predict the response of the tower to the wind excitation when the tower is hoisted to different stages, including the magnitude and frequency of stress, so as to judge whether the vortex-induced vibration suppression device needs to be used for interfering with the vortex-induced vibration. However, model assumptions and empirical parameters need to be selected in the simulation process, so that some errors can be brought to the simulation result, and meanwhile, the wind conditions of the project site are various and changeable, so that the method for guiding hoisting according to the simulation result lacks flexibility. Once errors occur in judgment, the excitation effect of wind cannot be effectively inhibited, so that the tower still has the possibility of generating vortex-induced vibration, the structural strength of the tower is reduced, the fatigue damage of the tower is increased, and even safety accidents are caused.
Therefore, a new tower hoisting method and a vortex-induced vibration monitoring system for a wind turbine generator system are needed.
Disclosure of Invention
According to the embodiment of the invention, the tower hoisting method and the vortex-induced vibration monitoring system of the wind generating set are provided, the actual stress state of the tower can be determined according to the dynamic response to the wind load in the actual hoisting process of the tower, and the vortex shedding frequency when the tower is hoisted is predicted, so that the purpose of accurately predicting the impending vortex-induced vibration of the tower in advance, adjusting the hoisting strategy in time, judging the installation position of the vortex-induced vibration suppression device and avoiding the influence of the vortex-induced vibration on the structural strength of the tower and the hoisting progress of the tower is achieved.
According to an aspect of an embodiment of the present invention, there is provided a tower hoisting method for a wind turbine generator system, the tower including N stacked and connected towers, where N is a natural number greater than 3, the tower hoisting method including: hoisting the first to Nth sections of the tower barrel from bottom to top in sequence; after the tower drums from the first section to the a section are hoisted, detecting the vibration frequency of the tower in the lifting force direction of the tower formed by the tower drums from the first section to the a section, wherein a is a natural number which is more than 1 and less than or equal to N; predicting a first vortex shedding frequency of the tower after hoisting of the tower barrel in the Nth section is finished based on the vibration frequency of the tower barrel in the lifting force direction formed by the tower barrels in the first section to the a section, and judging whether the first vortex shedding frequency meets a preset condition; and when the first vortex shedding frequency meets the preset condition, respectively installing vortex-induced vibration suppression devices on the (a + 1) th to nth sections of the tower barrel when the (a + 1) th to nth sections of the tower barrel are hoisted.
According to an aspect of an embodiment of the invention, the tower hoisting method further comprises: and installing a detection device at a predetermined test point of the tower consisting of the first to the a-th sections of the tower.
According to an aspect of an embodiment of the present invention, the detection apparatus includes: the strain gauge sensor is arranged on the tower drum wall of the tower drum in a manner that the length direction of the strain gauge sensor is consistent with the extending direction of the tower drum; or the acceleration displacement sensor is installed at the top of the tower consisting of the first section to the a section.
According to an aspect of an embodiment of the invention, the tower hoisting method further comprises: arranging two strain gauge sensors on the wall of the tower drum, and enabling an included angle between the two strain gauge sensors and a connecting line of the center of the tower drum to be 90 degrees; or more than three strain gauge sensors are arranged on the wall of the tower drum, and the more than three strain gauge sensors are uniformly distributed along the circumferential direction of the tower drum.
According to an aspect of an embodiment of the invention, the tower hoisting method further comprises: when the first vortex shedding frequency does not meet the preset condition, detecting the vibration frequency of the tower in the lifting force direction, which is formed by the first to the a +1 th sections of the tower after the tower is hoisted in the a +1 th section of the tower; predicting a second vortex shedding frequency of the tower after the hoisting of the nth section of tower drum is finished based on the vibration frequency of the tower in the lifting force direction formed by the first to the (a + 1) th sections of tower drums, and determining whether the second vortex shedding frequency meets the preset condition; and when the second vortex shedding frequency meets the preset condition, determining that the vortex-induced vibration suppression devices are respectively installed on the a +2 th to nth sections of the tower barrel when the a +2 th to nth sections of the tower barrel are hoisted.
According to an aspect of the embodiment of the present invention, when the installation direction of the detecting device is perpendicular to the direction in which the tower bears the load, the preset condition is: 90% fn is less than bfv and less than 110% fn, wherein fn is the natural frequency of the tower, fv is the vibration frequency of the tower in the lift direction, and b is a follow-up weighting coefficient.
According to another aspect of the embodiments of the present invention, there is also provided a vortex-induced vibration monitoring system applied to hoisting of a tower of a wind turbine generator system, the tower including N stacked tower barrels connected to each other, where N is a natural number greater than 3, the vortex-induced vibration monitoring system including: the detection device is arranged at a preset test point of the tower consisting of the first to the a-th sections of the tower, and is used for detecting the vibration frequency of the tower consisting of the first to the a-th sections of the tower in the lift force direction, wherein a is a natural number which is greater than 1 and less than or equal to N; and the processing device is connected with the detection device and used for predicting a first vortex shedding frequency of the tower after the tower is hoisted in the Nth section based on the vibration frequency in the tower lifting force direction formed by the first to the nth sections of the tower, judging whether the first vortex shedding frequency meets a preset condition, and determining that the vortex-induced vibration suppression devices are respectively installed on the (a + 1) th to the Nth sections of the tower when the tower is hoisted in the (a + 1) th to the Nth sections of the tower when the first vortex shedding frequency meets the preset condition.
According to another aspect of the embodiments of the present invention, the detection apparatus includes: the strain gauge sensor is arranged on the tower drum wall of the tower drum in a manner that the length direction of the strain gauge sensor is consistent with the extending direction of the tower drum; or the acceleration displacement sensor is installed at the top of the tower consisting of the first section to the a section.
According to another aspect of the embodiment of the invention, the detection device comprises two strain gauge sensors, and an included angle formed by the two strain gauge sensors and a connecting line of the center of the tower barrel is 90 degrees; or the detection device comprises more than three strain gauge sensors, and the more than three strain gauge sensors are uniformly distributed along the circumferential direction of the tower barrel.
According to another aspect of the embodiment of the present invention, when the installation direction of the detecting device is perpendicular to the direction in which the tower bears the load, the preset condition is: 90% fn is less than bfv and less than 110% fn, wherein fn is the natural frequency of the tower, fv is the vibration frequency of the tower in the lift direction, and b is a follow-up weighting coefficient.
To sum up, in the tower hoisting method and the vortex-induced vibration monitoring system for the wind turbine generator system according to the embodiments of the present invention, in the process of hoisting a tower having N sections of towers, after hoisting of the first to the a-th sections of towers is completed, the vibration frequency in the lift direction of the tower constituted by the first to the a-th sections of towers is detected, the first vortex shedding frequency after the tower is integrally hoisted is predicted based on the vibration frequency in the lift direction of the tower constituted by the first to the a-th sections of towers, and whether the first vortex shedding frequency meets a preset condition is determined, and when the first vortex shedding frequency meets the preset condition, it is determined that a vortex-induced vibration suppression device needs to be installed on the remaining tower to be hoisted. Therefore, the tower hoisting method and the vortex-induced vibration monitoring system provided by the embodiment of the invention can judge whether the intervention on the vortex-induced vibration possibly occurring on the tower is needed or not according to the excitation condition of the actual wind load on the tower in the actual hoisting process of the tower, and avoid the problems that the vortex-induced vibration occurs after the tower is hoisted, the hoisting process of the tower is influenced, the resource waste is caused, and even the structural strength of the tower is influenced.
Drawings
The invention may be better understood from the following description of specific embodiments thereof taken in conjunction with the accompanying drawings, in which:
other features, objects and advantages of the invention will become apparent from the following detailed description of non-limiting embodiments with reference to the accompanying drawings in which like or similar reference characters refer to the same or similar parts.
FIG. 1 is a force analysis diagram illustrating a tower of a wind turbine generator system being subjected to a wind excitation;
FIG. 2 is a flow chart of a tower hoisting method of a wind turbine generator system according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a specific installation example of the detecting unit according to the embodiment of the present invention;
fig. 4 is a schematic configuration diagram of another specific installation example of the detection apparatus according to the embodiment of the present invention;
FIG. 5 is a flow chart of a tower hoisting method of a wind turbine generator system according to another embodiment of the present invention;
FIG. 6 is a block diagram of a vortex induced vibration monitoring system according to one embodiment of the present invention;
fig. 7 is a schematic structural diagram of a specific application example of the vortex-induced vibration monitoring system shown in fig. 6.
Wherein, 10-tower cylinder; 20-vortex induced vibration monitoring system; 20 a-a data processing device; 21-a detection device; 22-a data acquisition device; 23-treatment device.
Detailed Description
Features and exemplary embodiments of various aspects of the present invention will be described in detail below. In the following detailed description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the present invention may be practiced without some of these specific details. The following description of the embodiments is merely intended to provide a better understanding of the present invention by illustrating examples of the present invention. In the drawings and the following description, at least some well-known structures and techniques have not been shown in detail in order to avoid unnecessarily obscuring the present invention; also, the dimensions of some of the structures may be exaggerated for clarity. The same reference numerals denote the same or similar structures in the drawings, and thus detailed descriptions thereof will be omitted. Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be directly connected or indirectly connected. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
According to the tower hoisting method and the vortex-induced vibration monitoring system of the wind generating set, provided by the embodiment of the invention, in the process of hoisting the tower of the wind generating set, the vortex shedding frequency when the integral hoisting of the tower is finished can be predicted according to the influence of the actually detected wind load on the hoisted tower, so that whether a vortex-induced vibration suppression device needs to be installed on a subsequently hoisted tower can or not can be determined according to the judgment structure, and the vortex-induced vibration possibly generated after the integral hoisting of the tower is finished can be interfered. Therefore, whether the vortex-induced vibration suppression device needs to be installed or not can be accurately judged by measuring the actual stress condition of the tower during hoisting, and further the influence on the structural strength of the tower and the whole installation process of the wind generating set due to the vortex-induced vibration during the hoisting process is prevented.
For better understanding of the present invention, a tower hoisting method and a vortex induced vibration monitoring system 20 of a wind turbine generator set according to an embodiment of the present invention are described below with reference to fig. 1 to 7.
FIG. 1 is a force analysis diagram illustrating the tower of a wind turbine generator system being excited by wind. The overall structure of the tower is not shown, and the wind excitation effect of the tower is analyzed only by taking a certain section of the tower 10 as an example. When the tower is under the action of wind load with certain speed, the stress direction of the tower can be dividedIn two directions, as shown in FIG. 1, wherein FLThe wind load borne by the tower in the lift direction, namely the acting force borne by the tower in the direction vertical to the wind load; fDThe wind load borne by the tower in the direction of resistance, i.e. the force that the tower is subjected to in a direction parallel to the wind load. The frequency of lift changes is the vortex shedding frequency, while the frequency of drag changes is twice the frequency of lift changes.
FIG. 2 is a flow chart of a tower hoisting method of a wind turbine generator system according to an embodiment of the invention. As shown in fig. 2, in order to prevent the tower from generating vortex-induced vibration due to wind excitation during the hoisting process, in this embodiment, the stress condition of the tower is detected when the tower is hoisted to the predetermined position, and whether a vortex-induced vibration suppression device (not shown in the figure) needs to be installed on the tower 10 to be hoisted is determined by analyzing according to the stress condition of the tower. Therefore, the problem that errors are likely to occur in judgment due to the fact that the time for installing the vortex-induced vibration suppression device on the tower is judged by adopting the existing construction model and selecting empirical parameters can be avoided.
In this embodiment, the tower hoisting method comprises the following steps.
And S101, sequentially hoisting the first section of tower drum to the Nth section of tower drum from bottom to top, wherein N is a natural number greater than 3.
For the exemplary purposes, it is assumed that the tower of the wind energy installation comprises N sections of tower 10. When the N tower barrels 10 are formed into the tower by the hoisting operation, the N tower barrels 10 are sequentially stacked and connected to each other in the order from bottom to top to form the complete tower.
Step S102, after the first to the a-th sections of tower barrels are hoisted, detecting the vibration frequency of the tower formed by the first to the a-th sections of tower barrels in the lifting force direction, wherein a is a natural number which is greater than 1 and less than or equal to N.
In general, the tower hoisting method in the embodiment of the invention is suitable for guiding the hoisting process of a high tower and a flexible tower, and vortex-induced vibration may occur when the tower reaches a predetermined height. For example, after the tower frame with a predetermined height of 80 m, that is, more than 80 m is hoisted, the vibration frequency generated when the tower frame is affected by the wind load may be close to the natural frequency of the tower frame, and thus the vortex-induced vibration may occur.
Therefore, in the process of hoisting the tower, the wind excitation frequency and the wind load applied to the tower need to be analyzed according to the dynamic response when the currently hoisted tower is subjected to the wind excitation action, that is, the vibration generated by the tower which is not hoisted under the wind excitation action is detected, and then the vortex shedding frequency of the tower after the integral hoisting is completed is predicted according to the obtained vibration frequency in the lifting force direction, so that the specific installation position of the vortex-induced vibration suppression device is accurately judged in the field hoisting process of the tower according to the detection result. The method can further comprise the steps of setting preset test points at corresponding positions of the tower, and installing corresponding detection devices 21 at the preset test points.
In order to ensure the accuracy of the finally obtained detection data and enable the data detected by the detection device 21 to truly and effectively reflect the stress condition of the tower, the position of the predetermined test point can be set according to the structural characteristics of the detection device 21 and the detection principle.
Fig. 3 is a schematic structural diagram of a specific installation example of the detection device 21 according to the embodiment of the present invention. As shown in fig. 3, in an exemplary embodiment, the above-mentioned detection device 21 includes a strain gauge sensor.
When the tower is provided with the strain gauge sensor as the detection device 21 to detect the stress condition of the tower, the detection principle of the strain gauge sensor is to sense the deformation of the object to be detected, characterize the deformation of the object to be detected as an electric signal, and further calculate to obtain the vibration frequency of the tower in the lifting force direction. For example, the strain gauge sensor may be mounted against the wall of the tower 10 in such a way that its length direction coincides with the extension direction of the tower. Meanwhile, when the tower deforms under the action of wind load, the deformation of the tower near the fixed end is the most serious, so that in order to acquire accurate data, the strain gauge sensor can be arranged on the wall of the tower near the bottom of the tower, namely the bottom of the wall of the first section of tower 10 of the tower. Of course, the strain gage sensor may be installed in advance when the first tower segment 10 is not hoisted, or may be installed after the first tower segment 10 is hoisted.
In addition, the number of the strain gauge sensors is not limited by the embodiment of the present invention, and two strain gauge sensors may be installed on the tower 10 (when one strain gauge sensor is installed, similarly to the case where two strain gauge sensors are installed), by way of example. The mounting mode of the two strain gauge sensors on the tower wall is as follows: the included angle between the two strain gauge sensors and the central connecting line of the tower barrel is 90 degrees. Therefore, the stress conditions of the tower can be detected in different directions through the two strain gauge sensors, and the vibration frequency of the tower in the lifting force direction can be guaranteed to be successfully captured to the maximum extent.
In some embodiments, more strain gage sensors may also be mounted on a single tower segment 10, i.e., more than three strain gage sensors may be mounted. And more than three strain gauge sensors may be uniformly arranged on the wall of the tower along the circumferential direction of the tower 10. By uniformly arranging more than three strain gauge sensors along the circumferential direction of the tower tube 10, the vibration frequency of the tower in multiple directions can be obtained, and at the moment, the vibration frequency of the tower in the lift force direction can be more accurately obtained.
In a specific implementation process, when the plurality of strain gauge sensors are arranged on the tower wall of the tower 10, the vibration frequencies in the plurality of directions detected by the plurality of strain gauge sensors can be obtained respectively, the vibration frequencies detected by the plurality of strain gauge sensors can be further screened, and the vibration frequency with the largest amplitude is screened from the plurality of detected vibration frequencies to be used as the vibration frequency in the lift force direction.
Fig. 4 is a schematic structural diagram of another specific installation example of the detection device 21 according to the embodiment of the present invention. In another exemplary embodiment, as shown in fig. 4, the detecting device 21 is an acceleration displacement sensor.
When the tower is provided with the acceleration displacement sensor as the detection device 21 to detect the stress condition of the tower, the detection principle of the acceleration displacement sensor is to sense the motion displacement of the object to be detected, characterize the motion displacement of the object to be detected as an acceleration value, and further obtain the vibration frequency of the tower in the lifting force direction through analysis and calculation. Meanwhile, when the tower moves under the action of wind load, the displacement amplitude of one end, far away from the fixed end, of the tower is the largest, so that the acceleration displacement sensor can be installed at the top of the tower in order to acquire the most accurate data. For example, when it is required to detect a force condition of a tower composed of 3 tower segments 10, an acceleration displacement sensor may be installed at a top position of the 3 rd tower segment 10.
Of course, the embodiment of the present invention is not limited to this, and in other embodiments, the detecting device 21 may further include other types of sensors, as long as the sensors can be mounted on the tower of the wind turbine generator system, and when the tower is affected by the wind load, the sensors detect the stress condition of the tower and obtain the vibration frequency of the tower in response to the stress condition.
As a rule of thumb, the tower may generate a vibration frequency under wind load that is close to the natural frequency of the tower when the tower is hoisted above a predetermined height. Typically, after the third tower 10 is hoisted, the vortex-induced vibration is significantly enhanced. In the embodiment of the present invention, it is exemplarily assumed that N is 5 and a is 3, that is, the tower has 5 tower segments 10. When the tower made of the 3 rd tower 10 of the 5 th tower 10 reaches the predetermined height, the vibration frequency of the tower made of the 3 rd tower 10 having completed hoisting needs to be detected.
In a specific implementation, after the 1 st to 3 rd tower sections 10 are hoisted (i.e. the hoisting operation of a part of the tower is completed), the detection device 21 starts to detect the vibration frequency of the tower formed by the 1 st to 3 rd tower sections 10. Specifically, taking the detecting device 21 as a strain gauge sensor as an example, since the strain gauge sensor is mounted on the tower wall of the tower 10 of the 1 st segment, when the tower is deformed by the wind load, the strain gauge in the strain gauge sensor is deformed along with the tower, and the strain gauge sensor generates strain and generates changed electrical signal data in response to the strain, and further processes the changed electrical signal data to obtain the vibration frequency of the tower formed by the towers 10 of the 1 st to 3 rd segments. Then, the vibration frequency with the maximum amplitude can be screened out from the vibration frequencies in multiple directions detected by the multiple strain gauge sensors to be used as the vibration frequency in the tower lift direction. Illustratively, when the strain gauge sensor is a resistive strain gauge sensor, the resistive strain gauge is capable of responding to a deformation of the tower and converting the deformation into a change in resistance.
When the acceleration displacement sensor is used as the detection device 21, the acceleration displacement sensor may be mounted on the top of the 3 rd tower 10. When the tower is subjected to a wind load and a displacement is generated at the upper part of the tower, the acceleration displacement sensor can generate an acceleration change based on the displacement of the tower, and the acceleration change data is further processed to obtain the vibration frequency of the tower composed of the 1 st to 3 rd tower sections 10 in the lift direction.
Step S103, predicting a first vortex shedding frequency of the tower after the hoisting of the Nth section of tower cylinder is finished based on the vibration frequency of the tower formed by the first to the a-th sections of tower cylinders in the lifting force direction, and judging whether the first vortex shedding frequency meets a preset condition.
Wherein the preset conditions are as follows:
equation (1) for 90% fn < bfv < 110% fn
Wherein fn is the natural frequency of the tower, fv is the vibration frequency of the tower in the lifting force direction, and b is the follow-up weighting coefficient.
In the embodiment of the present invention, b may set a corresponding value range according to the difference of the number N of segments of the tower 10 in the currently completed tower, and the value thereof may be different according to the value of a, and may take different values within the range. For example, when N is 5, the range of b may be defined as: 1.1-1.5, for example, when the number a of segments of the current hoisted tower 10 is 3, the value of b may be 1.3; and when the number a of the segments of the tower 10 which is currently hoisted is 4, the value of b can be 1.2.
In addition, in other embodiments, b may also be set by interpolation. For example, b is related to the number of segments of the currently hoisted tower 10, and in a specific case, b is related to the height, diameter, actual wind speed and other data of the tower formed by the currently hoisted tower 10, so that a specific function can be made by using the correspondence relationship between b and the number of segments of the currently hoisted tower 10. Illustratively, when N is 5, for example, the number of segments a of the tower 10 currently finished being hoisted is known to be 1, and accordingly, b is 1.5; and the number a of the segments of the tower 10 which is currently hoisted is 5, and accordingly, b is 1.1, a corresponding function can be constructed. Then, the function can be used to calculate the value of b corresponding to the number of different segments of the tower 10 that are currently lifted.
And S104, when the first vortex shedding frequency meets a preset condition, respectively installing vortex-induced vibration suppression devices on the (a + 1) th to nth tower barrels when the (a + 1) th to nth tower barrels are hoisted.
First, it is necessary to be able to acquire the vibration frequency of the tower made up of the first to the a-th tower barrels 10 in the lift direction detected by the detection device 21 in the above step S102.
For example, when N is 5 and a is 3, it is necessary to predict a first vortex shedding frequency of the tower after the 5 th tower 10 is hoisted based on the vibration frequency of the tower composed of the 1 st to 3 rd towers 10 in the lift direction detected by the detection device 21, and compare the first vortex shedding frequency with a preset condition.
For example, based on the above formula (1) and the above method for taking the follow-up weighting coefficient b, when a is 3, the value of b may be 1.3, so that the preset condition at this time is:
equation (2) for 90% fn < 1.3fv < 110% fn
Wherein fn is the natural frequency of the tower, and fv is the vibration frequency of the tower in the lift force direction. And 1.3fv in the formula (2) is the first vortex shedding frequency of the tower after the 5 th tower 10 is hoisted, which is predicted based on the vibration frequency of the tower consisting of the 1 st to the 3 rd towers 10 in the lifting force direction.
Whether the formula (2) is met by judging b1.3fv or not, namely whether the first vortex shedding frequency of the tower after the 5 sections of towers 10 are hoisted and the natural frequency of the tower meet the resonance occurrence condition or not, which is predicted based on the vibration frequency in the tower lift direction formed by the 1 st to 3 rd sections of towers 10 at the moment, is judged, namely whether vortex-induced vibration is likely to occur or not after the whole hoisting of the tower is completed.
Therefore, when 1.3fv satisfies the above formula (2), it is necessary to install the vortex-induced vibration suppression device in advance on the 4 th and 5 th tower 10 to be hoisted. So that after the 4 th and 5 th tower barrels 10 are hoisted, the vortex-induced vibration suppression device mounted on the tower can actively interfere with the vortex-induced vibration which may be caused by the wind load when the whole tower is mounted. Therefore, the tower can be prevented from being damaged by fatigue due to vortex-induced vibration generated by the action of wind excitation, and further the structural strength of the tower is prevented from being influenced.
Therefore, in the tower hoisting method provided by the embodiment of the invention, in the actual hoisting process of the tower, the first vortex shedding frequency when the integral hoisting of the tower is finished is predicted based on the actually detected vibration frequency generated in the lift direction of the currently hoisted tower under the excitation of wind, and the first vortex shedding frequency is compared with the preset condition. Therefore, it is possible to determine whether the first vortex shedding frequency and the natural frequency of the tower satisfy the resonance occurrence condition, and mount the vortex-induced vibration suppression device on the tower 10 at an appropriate position of the tower based on the determination result.
Compared with the mode that a simulation model needs to be established and empirical data is selected to judge the installation position of the vortex-induced vibration suppression device in the existing hoisting method, the tower hoisting method provided by the embodiment of the invention does not influence the judgment of the installation time of the vortex-induced vibration suppression device due to errors. Under different wind speed conditions, the tower bears different wind loads, and the vibration state of the tower also changes along with the wind speed, but the tower hoisting method provided by the embodiment of the invention can detect the vibration frequency of the tower consisting of partial tower drums 10 in the lifting force direction under the actual wind condition of a hoisting site, and accurately predict the first vortex shedding frequency of the whole tower after the whole tower is hoisted according to the vibration frequency of the tower consisting of partial tower drums 10 in the lifting force direction, so that the vortex-induced vibration which is possibly generated after the tower is hoisted can be accurately predicted, the hoisting strategy can be timely adjusted according to the actual hoisting condition, and the installation time of the vortex-induced vibration suppression device can be judged. The strength of the whole structure of the tower is prevented from being influenced by vortex-induced vibration, the tower is prevented from being damaged by fatigue, and the service life of the tower can be prolonged. Meanwhile, the hoisting process of the tower can be accelerated, the assembling working hours of the whole wind generating set are saved, and further resources such as manpower, financial resources and material resources are saved.
FIG. 5 is a flow chart of a tower hoisting method of a wind turbine generator system according to another embodiment of the present invention. As shown in fig. 5, steps S101 to S103 of the tower hoisting method of the present embodiment are the same as steps S101 to S103 of the tower hoisting method of the above embodiment, and therefore, are not repeated. The difference is that the tower hoisting method in this embodiment further includes step S105 and step S107.
And S105, when the first vortex shedding frequency does not meet the preset condition, detecting the vibration frequency of the tower in the lifting force direction formed by the first to the (a + 1) th sections of tower barrels after the hoisting of the (a + 1) th section of tower barrel is finished.
In some embodiments, it may be desirable to not have vortex induced vibration suppression devices installed on the last two tower 10 sections at the same time. Specifically, after the steps S101 to S103 are executed, when the first vortex shedding frequency obtained through analysis and calculation does not satisfy the preset condition, it indicates that a vortex-induced vibration suppression device does not need to be installed on the a +1 th tower 10 to be hoisted. Therefore, at this time, after the a +1 th tower 10 is hoisted, the stress condition of the tower consisting of the first to the a +1 th towers 10 at present needs to be detected by the detection device 21, so as to obtain the vibration frequency of the tower consisting of the first to the a +1 th towers 10 in the lift direction.
Illustratively, N-5 and a-3 are also set. When the first vortex shedding frequency does not meet the preset condition, after the 4 th tower drum is hoisted, the stress condition of the tower frame formed by the 1 st to 4 th tower drums 10 is detected through the detection device 21, and the vibration frequency of the tower frame formed by the 1 st to 4 th tower drums 10 in the lifting force direction is obtained.
It should be noted that, when the detecting device 21 is an acceleration displacement sensor, the acceleration displacement sensor may be mounted at the top position of the a +1 th tower 10 when the a +1 th tower 10 is mounted, so as to measure the tower vibration frequency more accurately through the acceleration displacement sensor.
And S106, predicting a second vortex shedding frequency of the tower after the hoisting of the Nth section of tower barrel is finished based on the vibration frequency of the tower in the lifting force direction, which is formed by the first to the (a + 1) th sections of tower barrels, and determining whether the second vortex shedding frequency meets a preset condition.
And S107, when the second vortex shedding frequency meets a preset condition, determining that the vortex-induced vibration suppression devices are respectively installed on the a +2 th to the Nth tower barrels when the a +2 th to the Nth tower barrels are hoisted.
In this step, the second vortex shedding frequency of the tower after the integral hoisting is completed needs to be predicted according to the detected vibration frequency of the tower formed by the first to a +1 th tower barrels 10 in the lift force direction, and the predicted second vortex shedding frequency is compared with a preset condition to judge whether the preset condition is met, so as to determine whether the vortex-induced vibration suppression device needs to be installed on the remaining tower barrels 10 to be hoisted.
For example, based on the above formula (1) and the above method for taking the follow-up weighting coefficient b, when a is 4, the value of b may be 1.15, so that the preset condition at this time is:
90% fn < 1.15fv < 110% fn formula (3)
Wherein fn is the natural frequency of the tower, and fv is the vibration frequency of the tower in the lift force direction. And 1.15fv in the formula (3) is the first vortex shedding frequency of the tower after the 5 th tower 10 is hoisted, which is predicted based on the vibration frequency of the tower in the lifting force direction formed by the 1 st to 4 th towers 10.
And then, comparing whether the obtained second vortex shedding frequency meets the formula (3) or not, and judging whether the predicted second vortex shedding frequency and the natural frequency of the tower meet the resonance occurrence condition or not by judging whether the second vortex shedding frequency meets the formula (3) or not, namely judging whether vortex-induced vibration possibly occurs after the whole hoisting of the tower is complete or not.
Therefore, when the second vortex shedding frequency satisfies the above formula (3), the vortex-induced vibration suppression device needs to be installed in advance on the 5 th tower 10 to be hoisted. So that it is possible to actively intervene by the vortex induced vibration suppression means on the vortex induced vibrations occurring throughout the tower which may be caused by the effect of wind loads. Therefore, the problem that the tower is damaged by fatigue and further the structural strength of the tower is influenced due to vortex-induced vibration generated by the action of wind excitation of the tower can be avoided.
The tower hoisting method provided by the embodiment of the invention is based on the fact that under the condition that the last section of hoisted tower barrel 10 does not need to be provided with the vortex-induced vibration suppression device, after the next section of tower barrel 10 is hoisted, the next section of tower barrel 10 needs to be further judged according to the vibration frequency of the tower in the lift direction detected in the actual hoisting operation process, so that the accurate installation position of the vortex-induced vibration suppression device is accurately judged, and the problems that the overall structural strength of the tower is influenced and the hoisting progress of the tower is influenced by the vortex-induced vibration can be avoided. According to the tower hoisting method provided by the embodiment of the invention, in the hoisting process of the tower, the second vortex shedding frequency of the tower when the integral hoisting is finished is predicted based on the actually detected vibration frequency of the tower which is currently formed by partial tower barrels 10 and generated in the lifting force direction under the action of wind excitation, and the second vortex shedding frequency is compared with the preset condition again. Therefore, it can be determined whether the second vortex shedding frequency and the natural frequency of the tower satisfy the resonance occurrence condition, so as to install the vortex-induced vibration suppression device on the tower 10 to be hoisted according to the determination result.
In addition, in an optional embodiment, the tower hoisting method may further include the step of verifying the effectiveness of the vortex-induced vibration suppression device mounted on the tower after the tower 10 on which the vortex-induced vibration suppression device is mounted is hoisted.
In this embodiment, after the N sections of tower drums 10 are completely hoisted, the current vibration frequency of the integrally hoisted tower in the lift direction (the vibration frequency at this time is equivalent to the vortex shedding frequency) needs to be detected by the detection device 21, then the current vibration frequency is compared with the preset condition, whether the current vibration frequency meets the preset condition is determined, and when the current vibration frequency does not meet the preset condition, it is determined that the vortex-induced vibration does not occur in the tower. Of course, the specific determination process according to the preset condition is similar to the process of determining whether the first vortex frequency satisfies the preset condition in the above embodiment, and therefore, the detailed description thereof is omitted.
If the current vibration frequency of the tower does not meet the preset condition, the current vortex-induced vibration suppression device is installed to effectively suppress vortex-induced vibration which may occur to the tower. And if the current vibration frequency meets the preset condition, the vortex-induced vibration suppression device is installed, so that the vortex-induced vibration generated by the tower cannot be effectively suppressed. Therefore, it is also necessary to perform corresponding troubleshooting such as whether a system failure has occurred, whether a vortex-induced vibration suppression device is mounted in place, and the like. Therefore, the effectiveness of the vortex-induced vibration suppression device can be verified in time after the vortex-induced vibration suppression device is installed, and the problems that the structural strength of the tower and the overall hoisting process are influenced due to the fact that the vortex-induced vibration which possibly occurs on the tower cannot be effectively suppressed due to reasons such as misoperation are avoided.
Of course, the tower hoisting method in this embodiment may also be applied to the case where the tower is not integrally hoisted, that is, after the hoisting of a certain tower drum 10 on which the vortex-induced vibration suppression device is installed is completed, the validity of the vortex-induced vibration suppression device installed on the tower which is not integrally hoisted may also be verified by using the verification steps described above.
Illustratively, when N is 5 and a is 3, when it is determined by detection that it is necessary to mount the vortex-induced vibration suppression device on the 4 th tower 10, the vortex-induced vibration suppression device is mounted on the 4 th tower 10 and the 4 th tower 10 is hoisted, at this time, the detection device 21 detects the vibration frequency of the tower frame formed by the 1 st to 4 th towers 10 in the lift force direction, predicts the vortex shedding frequency of the tower frame after the integral hoisting is completed according to the vibration frequency, compares the vortex shedding frequency with a preset condition, and determines that the tower frame after the integral hoisting is not subjected to the vortex-induced vibration if the predicted vortex shedding frequency does not meet the preset condition. The vortex induced vibration suppression device mounted on the 4 th tower 10 is determined to be effective.
In addition, the tower hoisting method in each of the above embodiments may further include: and when the predicted first vortex-induced vibration or the second vortex-induced vibration of the tower meets the corresponding preset condition, giving out a warning prompt. The form of the warning prompt is various, for example, a corresponding voice prompt can be sent out, or a corresponding message prompt can be sent out. So that an operator can install the vortex-induced vibration suppression device on the next tower barrel 10 to be hoisted according to the prompt, the judgment result can be quickly responded, corresponding hoisting operation steps are guided, and the hoisting working hours are further saved.
Referring to fig. 6 and 7 together, fig. 6 is a block diagram of a vortex induced vibration monitoring system 20 according to an embodiment of the present invention; FIG. 7 is a schematic diagram of one particular example application of the vortex induced vibration monitoring system 20 shown in FIG. 6. As shown in fig. 6, the vortex induced vibration monitoring system 20 includes a detection device 21, a data acquisition device 22, and a processing device 23. Through the vortex-induced vibration monitoring system 20, the installation time of the vortex-induced vibration suppression device can be accurately judged in the hoisting process of the tower, wherein the tower comprises N sections of tower barrels 10 which are overlapped and connected with each other, and N is a natural number greater than 3.
And a detection device 21, arranged at a predetermined test point of the tower composed of the first to the a-th sections of tower barrels 10, for detecting the vibration frequency in the lift direction of the tower composed of the first to the a-th sections of tower barrels 10, wherein a is a natural number greater than 1 and less than or equal to N.
And the data acquisition device 22 is connected with the detection device 21 and is used for acquiring the vibration frequency of the tower in the lifting force direction, which is formed by the first to the a-th sections of the tower barrel 10.
The processing device 23 is connected to the data acquisition device 22, and is configured to predict a first vortex shedding frequency of the tower after the nth tower tube 10 is hoisted based on a vibration frequency of the tower in the lift force direction, where the tower is composed of the first to nth tower tubes 10, and determine whether the first vortex shedding frequency meets a preset condition, and when the first vortex shedding frequency meets the preset condition, determine to install the vortex-induced vibration suppression devices on the a +1 th to nth tower tubes 10 when the a +1 th to nth tower tubes 10 are hoisted, respectively.
For a specific installation manner of the detection device 21, reference may be made to the corresponding description of the installation manner of the detection device 21 in the above method embodiment, and therefore, detailed description is not repeated.
The processing device 23 may include any computing device capable of calculating the detected vibration frequency in the tower lifting force direction to obtain the vortex shedding frequency of the tower after the tower is lifted, comparing the shedding frequency with a preset condition, and determining whether the vortex shedding frequency meets the preset condition, for example: a computer, a processor having a CPU, and the like, but are not limited thereto.
Of course, in a specific implementation, the processing device 23 needs to store the corresponding preset conditions in advance, such as inputting the natural frequency of the tower in advance. In a specific example, when the installation direction of the detecting device 21 is perpendicular to the direction in which the tower bears the load, the preset conditions are as follows: 90% fn < bfv < 110% fn, wherein fn is the natural frequency of the tower, fv is the vibration frequency of the tower composed of the first to the a-th tower cylinders 10 in the lifting force direction, b is the follow-up weighting coefficient, and bfv is the first vortex shedding frequency of the tower after the hoisting of the N-section tower cylinders 10 is completed, which is predicted based on the vibration frequency of the tower composed of the first to the a-th tower cylinders 10 in the lifting force direction.
In an alternative embodiment, the data acquisition device 22 and the processing device 23 may also be integrated in the same device for ease of portability. As shown in fig. 7, the data acquisition device 22 and the processing device 23 are integrated into a single body, constituting the data processing device 20 a. In addition, in some embodiments, a storage battery (not shown) may be further provided in the data processing device 20a for convenience of carrying and use.
According to another embodiment of the invention, when the first vortex shedding frequency does not satisfy the preset condition, after the a +1 th tower 10 is hoisted, the detection device 21 is further configured to detect the lift direction vibration frequency of the tower formed by the first to a +1 th towers 10.
The data acquisition device 22 is further configured to acquire the vibration frequency in the tower lift direction formed by the first to a +1 th tower 10.
The processing device 23 is further configured to predict a second vortex shedding frequency of the tower after the nth tower drum 10 is hoisted based on the vibration frequency of the tower in the lift direction, which is formed by the first to the (a + 1) th tower drums 10, and determine whether the second vortex shedding frequency meets a preset condition, and when the second vortex shedding frequency meets the preset condition, determine that the vortex-induced vibration suppression devices are respectively installed on the (a + 2) th to the nth tower drums 10 when the (a + 2) th to the nth tower drums 10 are hoisted.
According to another embodiment of the present invention, when the effectiveness of the vortex-induced vibration suppression device needs to be verified after the tower 10 with the vortex-induced vibration suppression device is hoisted, the detection device 21 is further configured to detect the current vortex shedding frequency of the tower after the integral hoisting is completed.
The data acquisition device 22 is further configured to be connected to the detection device 21, and acquire the current vortex shedding frequency of the tower after the integral hoisting is completed.
The processing device 23 is further configured to be connected to the data acquisition device 22, compare the current vortex shedding frequency with a preset condition, determine whether the current vortex shedding frequency meets the preset condition, and determine that no vortex-induced vibration occurs in the tower frame if the current vortex shedding frequency does not meet the preset condition.
That is to say, if the current vortex shedding frequency does not meet the preset condition, it is indicated that the resonance occurrence condition is not met between the current vortex shedding frequency of the tower after the integral hoisting and the natural frequency of the tower by installing the vortex-induced vibration suppression device at present. Therefore, the vortex-induced vibration suppression device can effectively suppress the vortex-induced vibration of the tower. If the preset conditions are met, corresponding problem troubleshooting needs to be carried out, such as whether system failure occurs or not, whether the vortex-induced vibration suppression device is installed in place or not, and the like.
In addition, the vortex-induced vibration monitoring system 20 may not include the data acquisition device 22, and the detection device 21 and the processing device 23 may be directly connected to transmit the vibration frequency data in the corresponding lift direction to the processing device 23.
In an alternative embodiment, the vortex induced vibration monitoring system 20 further comprises an alarm device (not shown in the figure), which may be integrated in the processing device 23 in this embodiment, for example.
Specifically, the processing device 23 is further configured to send an alarm instruction to the alarm device when the first vortex shedding frequency meets a preset condition.
And the alarm device is used for responding to the alarm instruction and sending out an alarm prompt.
The form of the warning prompt is various, for example, a corresponding voice prompt can be sent out, or a corresponding message prompt can be sent out. So as to prompt the installation of the vortex-induced vibration suppression device on the next tower barrel 10 to be hoisted, thereby being capable of quickly responding to the judgment result, executing the corresponding hoisting operation steps and further saving the hoisting working hours. Of course, the alarm device can also be used for sending out a warning prompt when the second vortex shedding frequency meets the corresponding preset condition.
It should be noted that the vortex-induced vibration monitoring system 20 according to the embodiment of the present invention may be applied to an execution body of corresponding process steps in the tower hoisting method according to the embodiment of the present invention, and the above and other operations and/or functions of each device in the vortex-induced vibration monitoring system 20 are respectively for implementing corresponding process steps of the methods shown in fig. 1 and fig. 4, and in view of that the above method embodiments have already described each process step in detail, for brevity, no further description is provided in the device embodiment of the vortex-induced vibration monitoring system 20.
The present invention may be embodied in other specific forms without departing from its spirit or essential characteristics. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Also, different features that are present in different embodiments may be combined to advantage. Other variations to the disclosed embodiments can be understood and effected by those skilled in the art upon studying the drawings, the specification, and the claims.

Claims (10)

1. A method for hoisting a tower of a wind turbine generator system, the tower comprising N stacked and interconnected towers, wherein N is a natural number greater than 3, the method comprising:
hoisting the first to Nth sections of the tower barrel from bottom to top in sequence;
after the tower drums from the first section to the a section are hoisted, detecting the vibration frequency of the tower in the lifting force direction of the tower formed by the tower drums from the first section to the a section, wherein a is a natural number which is more than 1 and less than or equal to N;
predicting a first vortex shedding frequency of the tower after hoisting of the tower barrel in the Nth section is finished based on the vibration frequency of the tower barrel in the lifting force direction formed by the tower barrels in the first section to the a section, and judging whether the first vortex shedding frequency meets a preset condition;
and when the first vortex shedding frequency meets the preset condition, respectively installing vortex-induced vibration suppression devices on the (a + 1) th to nth sections of the tower barrel when the (a + 1) th to nth sections of the tower barrel are hoisted.
2. The tower hoisting method of claim 1, further comprising: and installing a detection device at a predetermined test point of the tower consisting of the first to the a-th sections of the tower.
3. The tower hoisting method of claim 2, wherein the detection device comprises:
the strain gauge sensor is arranged on the tower drum wall of the tower drum in a manner that the length direction of the strain gauge sensor is consistent with the extending direction of the tower drum; or,
and the acceleration displacement sensor is installed at the top of the tower frame formed by the first to the a-th sections of the tower barrel.
4. The tower hoisting method of claim 3, further comprising:
arranging two strain gauge sensors on the wall of the tower drum, and enabling an included angle between the two strain gauge sensors and a connecting line of the center of the tower drum to be 90 degrees; or,
the method comprises the steps that more than three strain gauge sensors are arranged on the wall of the tower barrel, and the more than three strain gauge sensors are uniformly distributed along the circumferential direction of the tower barrel.
5. The tower hoisting method of claim 1, further comprising:
when the first vortex shedding frequency does not meet the preset condition, detecting the vibration frequency of the tower in the lifting force direction, which is formed by the first to the a +1 th sections of the tower after the tower is hoisted in the a +1 th section of the tower;
predicting a second vortex shedding frequency of the tower after the hoisting of the nth section of tower drum is finished based on the vibration frequency of the tower in the lifting force direction formed by the first to the (a + 1) th sections of tower drums, and determining whether the second vortex shedding frequency meets the preset condition;
and when the second vortex shedding frequency meets the preset condition, determining that the vortex-induced vibration suppression devices are respectively installed on the a +2 th to nth sections of the tower barrel when the a +2 th to nth sections of the tower barrel are hoisted.
6. The tower hoisting method according to any one of claims 2 to 5, wherein when the installation direction of the detection device is perpendicular to the direction in which the tower bears the load, the preset condition is:
90％fn＜bfv＜110％fn，
the frequency of the tower is the natural frequency of the tower, the frequency of the tower is the frequency of the tower in the lift force direction, and the frequency b is a follow-up weighting coefficient.
7. A vortex-induced vibration monitoring system applied to hoisting of a tower of a wind generating set, wherein the tower comprises N sections of tower barrels which are overlapped and connected with each other, wherein N is a natural number greater than 3, and the vortex-induced vibration monitoring system comprises:
the detection device is arranged at a preset test point of the tower consisting of the first to the a-th sections of the tower, and is used for detecting the vibration frequency of the tower consisting of the first to the a-th sections of the tower in the lift force direction, wherein a is a natural number which is greater than 1 and less than or equal to N;
and the processing device is connected with the detection device and used for predicting a first vortex shedding frequency of the tower after the tower is hoisted in the Nth section based on the vibration frequency in the tower lifting force direction formed by the first to the nth sections of the tower, judging whether the first vortex shedding frequency meets a preset condition, and determining that the vortex-induced vibration suppression devices are respectively installed on the (a + 1) th to the Nth sections of the tower when the tower is hoisted in the (a + 1) th to the Nth sections of the tower when the first vortex shedding frequency meets the preset condition.
8. The vortex induced vibration monitoring system of claim 7, wherein the detection device comprises:
the strain gauge sensor is arranged on the tower drum wall of the tower drum in a manner that the length direction of the strain gauge sensor is consistent with the extending direction of the tower drum; or,
and the acceleration displacement sensor is installed at the top of the tower frame formed by the first to the a-th sections of the tower barrel.
9. The vortex induced vibration monitoring system of claim 8,
the detection device comprises two strain gauge sensors, and an included angle formed by the two strain gauge sensors and a connecting line of the centers of the towers is 90 degrees; or,
the detection device comprises more than three strain gauge sensors, and the more than three strain gauge sensors are uniformly distributed along the circumferential direction of the tower barrel.
10. The vortex induced vibration monitoring system according to any of claims 7 to 9, wherein when the installation direction of the detection device is perpendicular to the direction in which the tower bears the load, the preset condition is:
90％fn＜bfv＜110％fn，
the frequency of the tower is the natural frequency of the tower, the frequency of the tower is the frequency of the tower in the lift force direction, and the frequency b is a follow-up weighting coefficient.
CN201710669695.6A 2017-08-07 2017-08-07 Tower hoisting method of wind generating set and vortex-induced vibration monitoring system Withdrawn CN107514344A (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108223293A (en) * 2018-01-29 2018-06-29 北京金风科创风电设备有限公司 hoisting method for wind generating set
CN109578224A (en) * 2019-01-31 2019-04-05 广东电网有限责任公司 A kind of safety monitoring system of wind-power generating unit tower
CN112360684A (en) * 2020-10-27 2021-02-12 中车株洲电力机车研究所有限公司 Method for inhibiting vortex-induced vibration of fan
CN112524334A (en) * 2020-11-27 2021-03-19 四川石油天然气建设工程有限责任公司 Construction method for large-scale cable crossing of oil and gas pipeline and tower dynamic stabilization process thereof
CN114060231A (en) * 2021-11-10 2022-02-18 中国华能集团清洁能源技术研究院有限公司 Vortex-induced vibration monitoring system based on radio ranging and installation method

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108223293A (en) * 2018-01-29 2018-06-29 北京金风科创风电设备有限公司 hoisting method for wind generating set
CN109578224A (en) * 2019-01-31 2019-04-05 广东电网有限责任公司 A kind of safety monitoring system of wind-power generating unit tower
CN112360684A (en) * 2020-10-27 2021-02-12 中车株洲电力机车研究所有限公司 Method for inhibiting vortex-induced vibration of fan
CN112524334A (en) * 2020-11-27 2021-03-19 四川石油天然气建设工程有限责任公司 Construction method for large-scale cable crossing of oil and gas pipeline and tower dynamic stabilization process thereof
CN114060231A (en) * 2021-11-10 2022-02-18 中国华能集团清洁能源技术研究院有限公司 Vortex-induced vibration monitoring system based on radio ranging and installation method

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Application publication date: 20171226