Methods, systems and storage media for detecting vortex-induced vibration of wind turbine units in grid-connected operation

Abstract

This invention discloses a method, system, and storage medium for detecting eddy-induced vibration (EVV) of a wind turbine during grid-connected operation, relating to the field of wind turbine grid connection research. The method includes the following steps: acquiring voltage and current data at the ports of a doubly-fed induction generator (DFIG) wind turbine before and after grid connection; calculating a first real-time dynamic energy and a second real-time dynamic energy at the DFIG ports based on the voltage and current data, where the first real-time dynamic energy corresponds to the DFIG port after grid connection, and the second real-time dynamic energy corresponds to the total energy at multiple DFIG ports before grid connection; if the difference between the first and second real-time dynamic energies exceeds a preset difference, eddy-induced vibration (EVV) detection is performed on the wind turbine; based on the EVV detection results, a turbulence-inducing component is deployed accordingly; after deploying the turbulence-inducing component, the above steps are repeated until the preset difference is met. This invention enables rapid and real-time detection of eddy-induced vibration, reducing unnecessary losses.

Description

Technical Field

[0001] This invention relates to the field of wind turbine grid connection research, and more specifically to a method, system and storage medium for suppressing vortex-induced vibration during grid-connected operation of wind turbines. Background Technology

[0002] With the continuous advancement of wind power technology, wind turbines are trending towards larger sizes. To obtain higher-quality wind energy resources and meet the installation requirements of large-diameter rotors, the height of wind turbine towers is constantly increasing, leading to increased tower flexibility. Under the influence of ambient wind speeds, periodic shedding vortices easily form on both sides of the tower, generating periodic lift loads and causing vortex-induced vibrations. This is particularly problematic for highly flexible towers; when the vortex shedding frequency is close to or equal to the tower's natural frequency, vortex-induced resonance can occur, causing significant tower vibrations and ultimately fatigue failure. Among them, vortex-induced vibration refers to the phenomenon that occurs when a wind turbine is shut down and there is crosswind in the nacelle. The wind, as a fluid, flows through the tower and the outside of the blades, forming a double-column flow phenomenon. The force generated by this phenomenon is much greater than the force generated by the vortex shedding from a single tower. The wake vortex shedding through the tower will exert a force on the unit. The shedding frequency of this force is consistent with the first-order frequency of the 90m high tower of the unit, so resonance will occur. This resonance problem is due to the superposition of the double-column flow around the long blades and the tower, which amplifies the value. The frequency lock-in phenomenon of the shedding vortex causes the unit vibration to be continuously amplified.

[0003] In conclusion, how to effectively detect vortex-induced vibration signals and reduce unnecessary losses is a topic that urgently needs to be studied by those skilled in the art. Summary of the Invention

[0004] In view of this, the present invention provides a method, system and storage medium for detecting vortex-induced vibration of wind turbine units in grid-connected operation, so as to solve the problems existing in the background art.

[0005] To achieve the above objectives, the present invention adopts the following technical solution:

[0006] A method for detecting vortex-induced vibration of a wind turbine unit during grid-connected operation includes the following steps:

[0007] The voltage and current data of the doubly fed wind turbine terminals were obtained before and after the wind turbine was connected to the grid.

[0008] The first real-time dynamic energy and the second real-time dynamic energy of the doubly fed wind turbine port are calculated based on the voltage data and the current data, respectively. The first real-time dynamic energy corresponds to the doubly fed discharge unit port after grid connection, and the second real-time dynamic energy corresponds to the total energy of multiple doubly fed wind turbine ports before grid connection.

[0009] If the difference between the first real-time dynamic energy and the second real-time dynamic energy is greater than the preset difference value M, then the wind turbine will be subjected to vortex-induced vibration detection.

[0010] Based on the vortex-induced vibration test results, corresponding turbulence components are deployed;

[0011] After the turbulence components are installed, repeat the above steps until the first real-time dynamic energy and the second real-time dynamic energy are less than or equal to the preset difference M.

[0012] Optionally, the specific steps for obtaining voltage and current data are as follows:

[0013] Based on the operating status of the wind turbine and its own parameters, a virtual wind turbine is established using digital twin technology.

[0014] Measure the first voltage and first current data of the virtual wind turbine.

[0015] Establish objective functions for virtual wind turbine voltage and current data;

[0016] Based on the objective function, state prediction equations for voltage and current data are established using the operating status of the wind turbine and its own parameters.

[0017] The first voltage and first current data are corrected according to the state prediction equation to obtain the final voltage and current data.

[0018] Optionally, the turbulence-disrupting component includes a turbulence-disrupting block and a turbulence-disrupting rope. The turbulence-disrupting block is disposed on the tower, and the turbulence-disrupting rope is connected to the turbulence-disrupting block to reduce vortex-induced vibration.

[0019] Optionally, the specific steps for vortex-induced vibration testing are as follows:

[0020] Collect vibration signals and wind speed signals from the wind turbine.

[0021] Plot the vibration signal image, the wind speed signal image, and the correlation image between the vibration signal and the wind speed signal, respectively.

[0022] Determine whether vortex-induced vibration occurs based on vibration signal images, wind speed signal images, and related images.

[0023] Optionally, if an abnormal vibration signal occurs, the corresponding turbulence intensity is estimated based on the wind speed signal, and it is determined whether the turbulence intensity meets the set conditions. If it does, the abnormal vibration is determined to be caused by the turbulence intensity.

[0024] A system for detecting vortex-induced vibration during grid-connected operation of a wind turbine generator, comprising:

[0025] Voltage and current data acquisition module: used to acquire the voltage and current data of the doubly fed wind turbine terminals before and after grid connection of the wind turbine.

[0026] Real-time dynamic energy acquisition module: used to calculate the first real-time dynamic energy and the second real-time dynamic energy of the doubly fed wind turbine port based on voltage data and current data respectively. The first real-time dynamic energy corresponds to the doubly fed discharge unit port after grid connection, and the second real-time dynamic energy corresponds to the total energy of multiple doubly fed wind turbine ports before grid connection.

[0027] Vortex-induced vibration detection module: used to detect vortex-induced vibration of wind turbine if the difference between the first real-time dynamic energy and the second real-time dynamic energy is greater than a preset difference value M.

[0028] Vortex-induced vibration suppression module: used to deploy turbulence components according to the vortex-induced vibration detection results;

[0029] Vortex-induced vibration secondary detection module: After the turbulence components are installed, repeat the above steps until the preset difference value M is met.

[0030] A computer storage medium storing a computer program, which, when executed by a processor, implements the steps of a method for detecting vortex-induced vibration of a wind turbine unit during grid-connected operation as described in any one of the claims.

[0031] As can be seen from the above technical solution, compared with the prior art, the present invention provides a method, system and storage medium for detecting vortex-induced vibration of wind turbine generators in grid-connected operation, which has the following beneficial effects:

[0032] 1. This invention can comprehensively analyze vortex-induced vibration, and based on the analysis results of the accurately obtained vibration signals, it can more accurately control the wind turbine, which is beneficial to the safe operation of the wind turbine.

[0033] 2. The present invention provides a protective mechanism on the outside of the tower to protect it from damage caused by vortex-induced vibration. Attached Figure Description

[0034] To more clearly illustrate the technical solutions in the embodiments of the present invention 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 only embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the provided drawings without creative effort.

[0035] Figure 1 This is a schematic diagram of the process of the present invention:

[0036] Figure 2 This is a schematic diagram of the structure of the present invention. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] This invention discloses a method for detecting vortex-induced vibration of wind turbine generators during grid-connected operation, such as... Figure 1 As shown, the following steps are included:

[0039] S1: Obtain the voltage and current data of the doubly fed wind turbine terminals before and after grid connection;

[0040] S2: Calculate the first real-time dynamic energy and the second real-time dynamic energy of the doubly fed wind turbine port based on the voltage data and current data respectively. The first real-time dynamic energy corresponds to the doubly fed discharge unit port after grid connection, and the second real-time dynamic energy corresponds to the total energy of multiple doubly fed wind turbine ports before grid connection.

[0041] S3: If the difference between the first real-time dynamic energy and the second real-time dynamic energy is greater than the preset difference value M, then the wind turbine will be subjected to vortex-induced vibration detection.

[0042] S4: Based on the vortex-induced vibration test results, corresponding turbulence components are installed;

[0043] S5: After completing the deployment of the turbulence components, repeat the above steps until the first real-time dynamic energy and the second real-time dynamic energy are less than or equal to the preset difference M.

[0044] Furthermore, in S1, the specific steps for acquiring voltage and current data are as follows:

[0045] S11: Based on the operating status of the wind turbine and its own parameters, establish a virtual wind turbine using digital twin technology;

[0046] S12: Measure the first voltage and first current data of the virtual wind turbine.

[0047] S13: Establish objective functions for virtual wind turbine voltage and current data;

[0048] S14: Based on the objective function, establish state prediction equations for voltage and current data using the operating status of the wind turbine and its own parameters.

[0049] S15: Correct the first voltage data and the first current data according to the state prediction equation to obtain the final voltage data and current data.

[0050] Furthermore, in S5, the turbulence-inducing component includes a turbulence block and turbulence ropes. The turbulence block is mounted on the tower, and the turbulence ropes are connected to the turbulence block to mitigate vortex-induced vibration. A winch mechanism is used to adjust the length of the suspension cable. The frequency domain characteristics of the tower's motion are obtained through Fourier analysis of the tower's acceleration signal. The vibration signal caused by wind force is decoupled by calculating the natural frequency to obtain the wind speed. The derived vortex-induced oscillation suppression interval is used to adjust the system's natural frequency, thereby achieving the purpose of suppressing vortex-induced oscillation.

[0051] Furthermore, in S3, the specific steps for vortex-induced vibration detection are as follows:

[0052] S31: Collect vibration signals and wind speed signals from the wind turbine generator;

[0053] S32: Draw the vibration signal image, wind speed signal image, and the correlation image of vibration signal and wind speed signal respectively;

[0054] S33: Determine whether vortex-induced vibration occurs based on vibration signal images, wind speed signal images, and related images.

[0055] Furthermore, if an abnormal vibration signal occurs, the corresponding turbulence intensity is estimated based on the wind speed signal. It is then determined whether the turbulence intensity meets set conditions. If it does, the vibration abnormality is determined to be caused by the turbulence intensity. In this invention, by collecting vibration and wind speed signals from the wind turbine, the peak value of the vibration signal is used to determine when the turbine experiences an abnormal vibration. The corresponding turbulence intensity is estimated based on the wind speed signal. If the turbulence intensity meets set conditions, the abnormal vibration is determined to be caused by the turbulence intensity. The control strategy for the wind turbine is primarily to adjust the decoupling parameters of torque control and pitch control, or primarily to adjust the gust control parameters and pitch control parameters. This control not only analyzes the collected vibration signals to determine whether a vibration fault has occurred, but also considers the influence of the turbulence intensity of the external wind conditions where the turbine is located.

[0056] and Figure 1 Corresponding to the method shown, the present invention also discloses a vortex-induced vibration detection system for grid-connected wind turbine units used for... Figure 1 The implementation of the method, specifically the structure is as follows: Figure 2 As shown, it includes:

[0057] Voltage and current data acquisition module: used to acquire the voltage and current data of the doubly fed wind turbine terminals before and after grid connection of the wind turbine.

[0058] Real-time dynamic energy acquisition module: used to calculate the first real-time dynamic energy and the second real-time dynamic energy of the doubly fed wind turbine port based on voltage data and current data respectively. The first real-time dynamic energy corresponds to the doubly fed discharge unit port after grid connection, and the second real-time dynamic energy corresponds to the total energy of multiple doubly fed wind turbine ports before grid connection.

[0059] Vortex-induced vibration detection module: used to detect vortex-induced vibration of wind turbine if the difference between the first real-time dynamic energy and the second real-time dynamic energy is greater than a preset difference value M.

[0060] Vortex-induced vibration suppression module: used to deploy turbulence components according to the vortex-induced vibration detection results;

[0061] Vortex-induced vibration secondary detection module: After the turbulence components are installed, repeat the above steps until the preset difference value M is met.

[0062] This embodiment also discloses a computer storage medium storing a computer program, which, when executed by a processor, implements the steps of a wind turbine grid-connected operation vortex-induced vibration detection method as described in any one of the above embodiments.

[0063] The various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. Reference can be made to the common and similar parts between the various embodiments. For the devices disclosed in the embodiments, since they correspond to the methods disclosed in the embodiments, the description is relatively simple, and the relevant parts can be referred to the method description.

[0064] 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 method for detecting vortex-induced vibration of a wind turbine unit during grid-connected operation, characterized in that, Includes the following steps: The voltage and current data of the doubly fed wind turbine terminals were obtained before and after the wind turbine was connected to the grid. The first real-time dynamic energy and the second real-time dynamic energy of the doubly fed wind turbine port are calculated based on the voltage data and the current data, respectively. The first real-time dynamic energy corresponds to the doubly fed wind turbine port after grid connection, and the second real-time dynamic energy corresponds to the total energy of multiple doubly fed wind turbine ports before grid connection. If the difference between the first real-time dynamic energy and the second real-time dynamic energy is greater than the preset difference value M, then the wind turbine will be subjected to vortex-induced vibration detection. Based on the vortex-induced vibration test results, corresponding turbulence components are deployed; After the turbulence components are installed, repeat the above steps until the first real-time dynamic energy and the second real-time dynamic energy are less than or equal to the preset difference M.

2. The method for detecting vortex-induced vibration of a wind turbine unit during grid-connected operation according to claim 1, characterized in that, The specific steps for obtaining voltage and current data are as follows: Based on the operating status of the wind turbine and its own parameters, a virtual wind turbine is established using digital twin technology. Measure the first voltage and first current data of the virtual wind turbine. Establish objective functions for virtual wind turbine voltage and current data; Based on the objective function, state prediction equations for voltage and current data are established using the operating status of the wind turbine and its own parameters. The first voltage and first current data are corrected according to the state prediction equation to obtain the final voltage and current data.

3. The method for detecting vortex-induced vibration of a wind turbine unit during grid-connected operation according to claim 1, characterized in that, The turbulence-disrupting component includes a turbulence-disrupting block and a turbulence-disrupting rope. The turbulence-disrupting block is mounted on the tower, and the turbulence-disrupting rope is connected to the turbulence-disrupting block to reduce vortex-induced vibration.

4. The method for detecting vortex-induced vibration of a wind turbine unit during grid-connected operation according to claim 1, characterized in that, The specific steps for vortex-induced vibration testing are as follows: Collect vibration signals and wind speed signals from the wind turbine. Plot the vibration signal image, the wind speed signal image, and the correlation image between the vibration signal and the wind speed signal, respectively. Determine whether vortex-induced vibration occurs based on vibration signal images, wind speed signal images, and related images.

5. The method for detecting vortex-induced vibration of a wind turbine unit during grid-connected operation according to claim 4, characterized in that, It also includes estimating the corresponding turbulence intensity based on the wind speed signal if an abnormal vibration signal occurs, determining whether the turbulence intensity meets the set conditions, and if so, determining that the abnormal vibration is caused by the turbulence intensity.

6. A system for detecting vortex-induced vibration during grid-connected operation of a wind turbine generator, characterized in that, include: Voltage and current data acquisition module: used to acquire the voltage and current data of the doubly fed wind turbine terminals before and after grid connection of the wind turbine. Real-time dynamic energy acquisition module: used to calculate the first real-time dynamic energy and the second real-time dynamic energy of the doubly fed wind turbine port based on voltage data and current data respectively. The first real-time dynamic energy corresponds to the doubly fed discharge unit port after grid connection, and the second real-time dynamic energy corresponds to the total energy of multiple doubly fed wind turbine ports before grid connection. Vortex-induced vibration detection module: used to detect vortex-induced vibration of wind turbine if the difference between the first real-time dynamic energy and the second real-time dynamic energy is greater than a preset difference value M. Vortex-induced vibration suppression module: used to deploy turbulence components according to the vortex-induced vibration detection results; Vortex-induced vibration secondary detection module: After the turbulence components are installed, repeat the above steps until the preset difference value M is met.

7. A computer storage medium, characterized in that, The computer storage medium stores a computer program, which, when executed by a processor, implements the steps of a method for detecting vortex-induced vibration of a wind turbine unit during grid-connected operation as described in any one of claims 1-5.

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