A blade vibration suppression system and method for a dual-rotor wind turbine

Abstract

The application discloses a kind of double wind wheel wind turbine blade vibration suppression system and method, belong to wind turbine technical field, system includes: multiple groups are arranged on double wind wheel front and rear blades, and the sensor device of collecting each environmental parameter and blade vibration data;Above data are collected and handled and analyzed by independent server;For judging the vibration type of two wind wheel blades and the detection occurrence device of alarm;Suppression device is formed by adopting multiple pairs of electrically controlled eddy current generator series connection.The system can monitor the vibration condition of the front and rear two wind wheel blades of double wind wheel wind turbine, determine the occurrence of flutter and vortex vibration, perform accident alarm and take suppression measures to destroy the vibration mechanism;The system helps to improve the safety and reliability of double wind wheel wind turbine, and is conducive to reducing the risk of accident.

Description

Technical Field

[0001] This invention relates to the field of wind turbine technology, and in particular to a vibration suppression system and method for dual-rotor wind turbine blades. Background Technology

[0002] With the development of large-capacity and high-efficiency wind turbines, in order to solve the problem of low wind energy utilization efficiency of single-rotor wind turbines, dual-rotor wind turbines have innovatively adopted a front and rear rotor configuration. By utilizing wind energy in a cascade manner, wind energy utilization efficiency has been improved and power generation has been increased.

[0003] However, with the increase in the number of rotor blades, the blades of dual-rotor wind turbines face more complex aeroelastic stability problems, including flutter and vortex-induced vibration. Both stall flutter and vortex-induced vibration are phenomena caused by flow separation and vortex shedding when airflow bypasses a high angle-of-attack airfoil, resulting in significant blade vibration. In severe cases, this can lead to ultimate failure of the unit and reduced fatigue life. Due to their unique front and rear rotor structure, dual-rotor wind turbines are more prone to flutter and vortex-induced vibration.

[0004] Currently, existing suppression systems mainly target tower vortex-induced vibration and blade flutter, including methods such as installing dampers, applying spoilers, and modifying structural design and materials to suppress vibration. These methods all increase design costs, are not suitable for the multi-bladed structure of dual-rotor wind turbines, and cannot effectively suppress blade flutter and vortex-induced vibration. Summary of the Invention

[0005] In view of the above-mentioned technical problems, the present invention provides a blade vibration suppression system and method for dual-rotor wind turbines that at least solves some of the above-mentioned technical problems. It is applicable to the multi-blade structure of dual-rotor wind turbines, can effectively suppress blade flutter and vortex-induced vibration, helps to improve the reliability of dual-rotor wind turbines, and reduces the risk of accidents. At the same time, the system also has the advantages of simple and reasonable structure and low cost.

[0006] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0007] In a first aspect, the present invention provides a vibration suppression system for a dual-rotor wind turbine blade, the system comprising: multiple sets of sensor devices, a server, a detection and generation device, and a suppression device, wherein:

[0008] The sensor device is connected to the server and is arranged on the blades of the dual-rotor wind turbine. It is used to collect relevant data on the incoming flow and the blades in real time and upload the collected data to the server.

[0009] The server is used to receive and store data uploaded by sensor devices, process the data, and classify, name, and number the data according to a preset format.

[0010] The detection device is connected to the server and the suppression device respectively. It is used to call data in the server to determine the risk of blade flutter and vortex vibration. If the risk is determined to exist, a command is issued to start the suppression device.

[0011] The suppression device is arranged on the blade and is used to receive instructions from the detection device to suppress blade vibration.

[0012] Preferably, at least three sets of the sensor devices are arranged on each blade, at the blade tip, the middle of the blade, and the root of the blade.

[0013] Preferably, each group of sensor devices includes: a wind speed sensor, a wind direction sensor, and a vibration sensor, which are used to collect the wind speed, wind direction, and blade vibration data of the incoming flow in real time.

[0014] Preferably, the server processes the data and categorizes, names, and numbers it according to a preset format, including: removing erroneous and invalid data, and categorizing, naming, and numbering the data according to time, front and rear wind turbines, blades, sensor device locations, and data types.

[0015] Preferably, the detection device determines the risk of blade flutter and vortex vibration, and if a risk is determined to exist, it also issues an alarm signal.

[0016] Preferably, the suppression device consists of multiple electrically controlled eddy current generators connected in series, with each electrically controlled eddy current generator installed on the blade surface at a preset angle.

[0017] Preferably, the electrically controlled eddy current generator is installed along the entire span of the blade from the blade root to the blade tip, or along 50% of the span to the blade tip.

[0018] Preferably, each of the electrically controlled eddy current generators includes: a left guide plate, a right guide plate, a slide rail, and a base, wherein:

[0019] The left and right guide vanes are mounted on the base via the slide rails;

[0020] The base is mounted on the blade surface;

[0021] When no instruction is received from the detection device, the electronically controlled eddy current generator is in a flat state. When an instruction is received from the detection device, the left and right guide plates of the electronically controlled eddy current generator move on the slide rail under electronic control and adjust their included angle to suppress flow separation at large angles of attack on the airfoil surface, disrupt the stable state of vortex shedding, and suppress vibration.

[0022] Preferably, the left guide vane and the right guide vane are of any one of the following structures: rectangular, trapezoidal or triangular.

[0023] Secondly, the present invention also provides a method for suppressing the vibration of a dual-rotor wind turbine blade, applied to the aforementioned dual-rotor wind turbine blade vibration suppression system, to achieve the suppression of the vibration of the dual-rotor wind turbine blade. The method includes:

[0024] S1. Data is collected in real time by sensor devices installed on various parts of the blade and transmitted to the server;

[0025] S2. The server receives and stores data, and processes and categorizes the data;

[0026] S3. The detection device calls the data processed by the server for analysis to determine the blade status. If it determines that the blade is fluttering or vortex-induced vibration, it sends a command to start the blade suppression device and issue an alarm signal.

[0027] S4. The suppression device receives instructions from the detection and generation device and, by adjusting the angle of the electronically controlled eddy current generator, suppresses flow separation at large angles of attack on the airfoil surface, disrupts the stable state of vortex shedding, and suppresses vibration.

[0028] Compared with the prior art, the technical solution of the present invention has at least the following beneficial technical effects:

[0029] This invention provides a vibration suppression system and method for dual-rotor wind turbine blades, applicable to the multi-blade structure of dual-rotor wind turbines. It can monitor the vibration of the front and rear rotor blades of the dual-rotor wind turbine in real time, determine the occurrence of flutter and vortex-induced vibration, and effectively suppress blade flutter and vortex-induced vibration, which helps to improve the reliability and safety of dual-rotor wind turbines and reduce the risk of accidents. At the same time, the system has the advantages of simple and reasonable structure and low cost.

[0030] Other features and advantages of the invention will be set forth in the following description, and will be apparent in part from the description, or may be learned by practicing the invention. The objects and other advantages of the invention may be realized and obtained by means of the structures particularly pointed out in the written description and the accompanying drawings.

[0031] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0032] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0033] The accompanying drawings are provided to further illustrate the invention and form part of the specification. They are used together with the embodiments of the invention to explain the invention and do not constitute a limitation thereof.

[0034] Figure 1 This is a schematic diagram of the structure of a dual-rotor wind turbine blade vibration suppression system provided by the present invention.

[0035] Figure 2 This is a schematic diagram of the structure of an electrically controlled eddy current generator provided by the present invention.

[0036] Figure 3 This is a schematic diagram of the flat state of an electrically controlled eddy current generator provided by the present invention.

[0037] Figure 4 This is a flowchart illustrating a method for suppressing blade vibration in a dual-rotor wind turbine provided by the present invention.

[0038] Among them, 1-sensor device; 2-server; 3-detection device; 4-suppression device; 401-left guide plate; 402-right guide plate; 403-slide rail; 404-base. Detailed Implementation

[0039] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0040] In the description of this invention, it should be noted that the terms "upper", "lower", "inner", "outer", "front end", "rear end", "both ends", "one end", "the other end", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limiting this invention.

[0041] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0042] Example 1:

[0043] Reference Figure 1As shown, this embodiment of the invention provides a vibration suppression system for a dual-rotor wind turbine blade. The system includes: multiple sets of sensor devices 1, a server 2, a detection and generation device 3, and a suppression device 4.

[0044] The following is a detailed description of each of the above components:

[0045] In this embodiment, sensor device 1 is connected to server 2. Sensor device 1 is arranged on the blades of the dual-rotor wind turbine and is used to collect relevant data on the incoming flow and blades in real time, and upload the collected data to server 2. Server 2 is used to receive and store the data uploaded by sensor device 1, process the data, and classify and number it according to a preset format. Detection device 3 is connected to server 2 and suppression device 4 respectively. It is used to call the data in server 2 to determine the risk of blade flutter and vortex-induced vibration. If a risk is determined, a command is issued to activate suppression device 4. Suppression device 4 is arranged on the blade and is used to receive the command from detection device 3 to suppress blade vibration.

[0046] More specifically:

[0047] In this embodiment, sensor devices 1 are respectively arranged on the front and rear wind turbines, with at least three sets arranged on each blade, respectively arranged at the tip, middle and root of the blade. Each set of sensor devices 1 includes: wind speed sensor, wind direction sensor and vibration sensor, which are used to collect the wind speed, wind direction and blade vibration data of the incoming flow in real time, and transmit the data to server 2 after collection.

[0048] In this embodiment, server 2 can receive the data collected in real time by the sensor device 1, remove erroneous and invalid data, and categorize and name the data according to time, front and rear wind turbines, blades, sensor device location, and data type (some numbers are as follows). Figure 1 As shown in the figure, for example, 1.1.1.1 represents the sensor, the front impeller, the first blade, and the sensor device located at the blade tip, respectively. Similarly, the meanings of other numbers can be understood. As a preferred embodiment of this example, for example, the wind speed, wind direction, and vibration data collected by the sensor device at the tip of the first blade of the front impeller are named and saved as data_time_b1.1.1.1_v, data_time_b1.1.1.1_d, and data_time_b1.1.1.1_z, respectively. The wind speed, wind direction, and vibration data collected by the sensor device at the root of the third blade of the rear impeller are named and saved as data_time_b1.2.3.3_v, data_time_b1.2.3.3_d, and data_time_b1.2.3.3_z, respectively, to facilitate the use of the detection generator 3.

[0049] In this embodiment, the detection device 3 is connected to both the server 2 and the suppression device 4. The detection device 3 calls data from the server 2. When the detected blade amplitude exceeds the system's preset vibration value, it compares the blade vibration frequency with the blade flapping frequency, oscillation frequency, and torsional frequency to determine the vibration type. If the blade is oscillating, and the vibration frequency coincides with the oscillation frequency range, and the wind speed and direction meet the vortex-induced vibration conditions, then vortex-induced vibration is determined to have occurred, posing a risk. The suppression device 4 is then activated and an alarm signal is issued. If the blade is torsional, and the vibration frequency coincides with the torsional frequency range, and the wind speed and direction meet the stall flutter conditions, then flutter is determined to have occurred, posing a risk. The suppression device 4 is then activated and an alarm signal is issued. Preferably, all of the above frequency ranges are set to ±20%.

[0050] In a preferred embodiment of this invention, the suppression device 4 consists of multiple electrically controlled eddy current generators connected in series on the blade surface, with each eddy current generator vertically mounted on the blade surface at a preset mounting angle. In this embodiment, the eddy current generator is preferably made of a non-metallic material, such as high-strength ABS plastic, to effectively reduce costs.

[0051] As a preferred embodiment of this invention, the eddy current generator can be installed across the entire span of the blade from the blade root to the blade tip (e.g., ...). Figure 1 The rightmost part shows the schematic installation of the vortex generator; it can also be installed along 50% of the span to the blade tip; it can be a series connection or multiple sets connected in parallel and then connected in series.

[0052] As a preferred embodiment of this example, Figure 2 As shown, a single vortex generator includes a left guide plate 401, a right guide plate 402, a slide rail 403, and a base 404. The slide rail 403 is mounted on the base 404, and the left and right guide plates can move on the slide rail 403. The base 404 is mounted on the blade surface. Initially, the left and right guide plates are arranged in a V-shape when standing upright; their shape is not limited to rectangles, but can also be trapezoidal or triangular.

[0053] In this embodiment, when the electronically controlled eddy current generator does not receive the start command from the detection generating device 3, it is in a flat state (e.g., Figure 3 As shown), it does not affect the normal aerodynamic characteristics of the blade; when the start command of the detection device 3 is received, the left and right guide vanes can move on the slide rail 403 under the action of electronic control and stand in a vertical state. By adjusting the included angle (preferably 0° to 90°), the flow separation at large angle of attack on the airfoil surface is suppressed, the stable state of vortex shedding is disrupted, and thus the vibration is suppressed.

[0054] As described above, those skilled in the art will understand that the present invention provides a blade vibration suppression system for a dual-rotor wind turbine. This system includes multiple sensor devices, a server, a detection and generation device, and a suppression device. This system can monitor the vibration of the front and rear rotor blades of a dual-rotor wind turbine in real time, determine the occurrence of flutter and vortex-induced vibration, and effectively suppress blade flutter and vortex-induced vibration, thus improving the reliability and safety of the dual-rotor wind turbine and reducing the risk of accidents. Furthermore, this system also has the advantages of simple and reasonable structure and low cost.

[0055] Example 2:

[0056] Reference Figure 4 As shown in the figure, this invention also provides a method for suppressing blade vibration in a dual-rotor wind turbine, the method comprising:

[0057] S1. Data is collected in real time by sensor devices installed on various parts of the blade and transmitted to the server;

[0058] S2. The server receives and stores data, and processes and categorizes the data;

[0059] S3. The detection device calls the data processed by the server for analysis to determine the blade status. If it determines that the blade is fluttering or vortex-induced vibration, it sends a command to start the blade suppression device and issue an alarm signal.

[0060] S4. The suppression device receives instructions from the detection and generation device and, by adjusting the angle of the electronically controlled eddy current generator, suppresses flow separation at large angles of attack on the airfoil surface, disrupts the stable state of vortex shedding, and suppresses vibration.

[0061] The core idea of ​​this method is as follows: ① Sensors installed on various parts of the blade collect various data in real time and transmit them to the server; ② The processed and classified data are used to determine the vibration state of the blade by a detection and generation device; ③ If flutter or vortex vibration occurs, an alarm signal is issued and the blade suppression device is activated; ④ The blade suppression device consists of multiple electronically controlled vortex generators connected in series. The vortex generators suppress flow separation at large angles of attack on the airfoil surface by changing the included angle, disrupting the stable state of vortex shedding, and suppressing vibration.

[0062] The vibration suppression method for dual-rotor wind turbine blades provided in this embodiment of the invention has the same implementation principle and technical effect as the aforementioned embodiment of a dual-rotor wind turbine blade vibration suppression system. For the sake of brevity, any parts not mentioned in this embodiment can be referred to the corresponding content in the aforementioned embodiment of a dual-rotor wind turbine blade vibration suppression system, and will not be repeated here.

[0063] This specification uses a progressive approach in its description; similar or identical parts between different embodiments can be referred to interchangeably. Parts of the embodiments of this invention not described herein can be obtained from the corresponding product manuals or existing technologies in the field, and are considered well-known in the art, and will not be elaborated upon further.

[0064] The embodiments of the present invention have been described in detail above, and the principles and implementation methods of the present invention have been explained. The description of the above embodiments is only for the purpose of helping to understand the method and core ideas of the present invention.

[0065] The above description of the disclosed embodiments enables those skilled in the art to make or use the invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the invention. Therefore, the invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A dual-rotor wind turbine blade vibration suppression system, characterized in that, The system comprises a plurality of sensor devices, a server, a detection generating device and a suppression device, wherein: The sensor devices are connected to the server, and are arranged on the blades of a double-rotor wind turbine generator, for collecting relevant data of the incoming flow and the blades in real time, and uploading the collected data to the server; The server is used for receiving and storing the data uploaded by the sensor devices, processing the data, and classifying and naming the data according to a preset format; The detection generating device is connected to the server and the suppression device, for calling the data in the server, judging the risk of blade flutter and vortex vibration, and issuing an instruction to start the suppression device if the risk exists; The suppression device is arranged on the blade, for receiving the instruction from the detection generating device, and suppressing the vibration of the blade; Each of the sensor devices is arranged on each blade in at least three groups, at the tip, middle and root of the blade; Each of the sensor devices comprises a wind speed sensor, a wind direction sensor and a vibration sensor, for collecting the wind speed, wind direction and blade vibration data of the incoming flow in real time, respectively; The server processes the data and classifies and names the data according to a preset format, including removing error and invalid data, and classifying and naming the data according to time, front and rear rotors, blades, sensor device positions and data types, respectively; The detection generating device judges the risk of blade flutter and vortex vibration, and also issues an alarm signal if the risk exists; The detection generating device calls the server data, and when the detected blade amplitude exceeds the preset vibration value of the system, compares the blade vibration frequency with the blade flapping frequency, edgewise frequency and torsional frequency to determine the vibration type; if the blade is in edgewise motion, the vibration frequency and the edgewise frequency coincide, the wind speed and the wind direction meet the vortex vibration condition, it is determined that vortex-induced vibration occurs, the risk exists, and the suppression device is started and an alarm signal is issued; if the blade is in torsional vibration, the vibration frequency and the torsional frequency coincide, the wind speed and the wind direction meet the stall flutter condition, it is determined that flutter occurs, the risk exists, and the suppression device is started and an alarm signal is issued; The suppression device is composed of a plurality of electrically controlled vortex generators connected in series, each of which is installed on the surface of the blade at a preset angle; the electrically controlled vortex generators are installed at all spanwise positions from the blade root to the blade tip, or along 50% of the spanwise position to the blade tip; each of the electrically controlled vortex generators comprises a left guide vane, a right guide vane, a slide rail and a base, wherein: The left guide vane and the right guide vane are installed on the base through the slide rail; The base is installed on the surface of the blade; When no instruction is received from the detection generating device, the electrically controlled vortex generator is in a flat state, and when the instruction is received from the detection generating device, the left guide vane and the right guide vane of the electrically controlled vortex generator move and adjust the included angle on the slide rail under the electrical control, suppress the flow separation at large attack angle of the airfoil surface, disrupt the stable state of vortex shedding, and suppress the vibration occurrence.

2. The blade vibration suppression system of a dual-rotor wind turbine generator according to claim 1, wherein The left guide vane and the right guide vane are either rectangular, trapezoidal or triangular.

3. A method for suppressing blade vibration of a double-rotor wind turbine generator, characterized by, The application is applied to the blade vibration suppression system of the double-rotor wind turbine of any one of claims 1-2, realizes the suppression of the blade vibration of the double-rotor wind turbine, and the method comprises the following steps: S1, collecting data in real time through a sensor device installed at each part of the blade, and transmitting the data to a server; S2, the server receives and stores the data, and processes and classifies the data; S3, the detection generating device analyzes the data processed by the server, judges the state of the blade, and if the blade is judged to have flutter or vortex vibration, an instruction is issued to start the blade suppression device and an alarm signal is issued; S4, the suppression device receives the instruction of the detection generating device, adjusts the included angle of the electrically controlled vortex generator, suppresses the flow separation of the high angle of attack of the airfoil surface, disrupts the stable state of the vortex shedding, and suppresses the vibration.

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