A method and system for operating a wind turbine drive train sweep

Abstract

The application discloses a kind of drive chain sweep frequency method and system of operating wind turbine, the method includes steps: S1, selects the vibration measuring point of operating wind turbine drive chain;S2, obtains the vibration data of each measuring point in the process of wind turbine operation;S3, the vibration data of each measuring point is analyzed and handled, and processing result is obtained, the processing result is compared with preset threshold value, when the processing result is not in preset threshold value, then it is judged that drive chain has abnormal vibration.The application has the advantages such as simple operation, guaranteeing unit safe operation, providing data support for predictive maintenance and the like.

Description

TECHNICAL FIELD

[0001] The present application mainly relates to the field of wind power generation technology, and particularly relates to a method and system for scanning frequency of a transmission chain of a running wind turbine. BACKGROUND

[0002] With more and more product spectrum of wind turbines, the running speed range is also wider, and the problems caused by vibration of wind turbines are not easy to be detected at the beginning of design. As the running time of wind turbines is longer and longer, the vibration problems will also come to the surface. However, since the best time to deal with the problem has been missed, the difficulty of dealing with the problem on site will be particularly high. SUMMARY

[0003] The technical problem to be solved by the present application is that in view of the problems in the prior art, the present application provides a method and system for scanning frequency of a transmission chain of a running wind turbine, which is simple to operate, ensures safe operation of the unit, and provides data support for predictive maintenance.

[0004] To solve the above technical problems, the technical scheme provided by the present application is:

[0005] A method for scanning frequency of a transmission chain of a running wind turbine, comprising the steps of:

[0006] S1, selecting a vibration measuring point of the transmission chain of the running wind turbine;

[0007] S2, obtaining vibration data of each measuring point during operation of the wind turbine;

[0008] S3, analyzing and processing the vibration data of each measuring point to obtain a processing result, and comparing the processing result with a preset threshold value, and when the processing result is not within the preset threshold value, it is judged that the transmission chain has abnormal vibration.

[0009] As a further improvement of the above technical scheme:

[0010] In step S1, at least one measuring point is arranged in each level structure in XYZ three directions according to the mechanical structure of the transmission chain under the principle of "selecting the shortest transmission path and the largest rigidity along the path", and the modal points found in dynamic simulation are avoided.

[0011] The specific process of step S2 is:

[0012] According to the wind turbine speed-power curve corresponding relationship table, the wind turbine is controlled to operate stably according to the wind turbine speed-power curve corresponding relationship table;

[0013] According to the wind turbine speed-power curve corresponding relationship table, the vibration data of each measuring point is automatically collected after the wind turbine operates stably according to the speed-power curve corresponding relationship table;

[0014] According to the rotational speed-power curve corresponding relation table, the operating rotational speed of the wind turbine is divided into N operating conditions, so as to ensure the collection of N sets of vibration data.

[0015] The specific process of step S3 is as follows:

[0016] The vibration data of each measuring point is analyzed and processed to obtain the effective value of the vibration data, wherein the vibration data includes vibration acceleration and vibration amplitude.

[0017] The effective value is compared with the preset threshold value, and when the effective value is not within the preset threshold value, it is judged that the transmission chain has abnormal vibration.

[0018] When it is judged that the transmission chain has abnormal vibration, according to the modal theory and the vibration equation, the vibration source is found out, the vibration transmission path is determined, and then the modal vibration mode when the abnormal vibration occurs is determined, and then the dynamics simulation is carried out to determine whether the abnormal vibration will affect the performance of the component or the system. If the abnormal vibration affects the performance of the component or the system, the reason is analyzed through simulation and the exceeding phenomenon is reproduced, and then an optimization scheme of the vibration component parameters is issued, the vibration state after the optimization parameters are simulated on the simulation is confirmed, and then the optimization scheme is executed on the new product, and the vibration amplitude is confirmed to be reduced through the frequency sweep test again.

[0019] The application further discloses a transmission chain frequency sweep system for operating a wind turbine, comprising:

[0020] The first program module is used for selecting vibration measuring points of the transmission chain of the operating wind turbine.

[0021] The second program module is used for acquiring vibration data of each measuring point during the operation of the wind turbine.

[0022] The third program module is used for analyzing and processing the vibration data of each measuring point to obtain a processing result, comparing the processing result with a preset threshold value, and judging that the transmission chain has abnormal vibration when the processing result is not within the preset threshold value.

[0023] The application further discloses a computer readable storage medium, which stores a computer program, and the computer program executes the steps of the method when being run by a processor.

[0024] The application further discloses a computer device, which comprises a memory and a processor, and the memory stores a computer program, and the computer program executes the steps of the method when being run by the processor.

[0025] Compared with the prior art, the application has the following advantages:

[0026] The application carries out the test method of the sweep frequency by operating the drive chain of the wind turbine, and carries out vibration measurement on the vibration state of the drive chain of the wind turbine in the full-speed operation range, which is not only beneficial to the operation safety of the unit, but also can realize the sweep frequency of the drive chain of the wind turbine based on the deep mining of the measurement data, and further optimize the structure and related parameters of the drive chain of the wind turbine.

[0027] The application is suitable for the equipment running in a wide speed range and combined with multiple components, such as a wind turbine, and the application changes the passive and periodic data collection mode into the mode of adding a collection device and actively controlling the wind turbine to collect the vibration data of the drive chain under various working conditions, so as to realize the sweep frequency of the drive chain of the wind turbine; the vibration sweep frequency under a single working condition is changed into the sweep frequency according to the actual load of the wind turbine, so as to ensure the authenticity and reliability of the data; through the above method, it can be known whether the resonance will be caused in the running speed range of the equipment and whether the vibration will exceed the standard; through the continuous accumulation of the acceleration data of the drive chain of the wind turbine, not only the safe operation of the unit can be ensured, but also whether the vibration encountered by the drive chain of the wind turbine is too large can be judged through the deep mining of the acceleration data of the drive chain, so as to provide data support for predictive maintenance. BRIEF DESCRIPTION OF DRAWINGS

[0028] Figure 1 The flowchart of the sweep frequency method of the application in the embodiment.

[0029] Figure 2 The Bode diagram curve comparison dynamics simulation diagram of the eight measuring points in the application.

[0030] Figure 3 The simulation diagram of the gearbox before and after optimization in the application. DETAILED DESCRIPTION

[0031] The application will be further described below in combination with the drawings and specific embodiments.

[0032] As shown in the drawings, Figure 1 the sweep frequency method of the drive chain of the running wind turbine in the embodiment of the application includes the following steps:

[0033] S1, selecting the vibration measuring point of the drive chain of the running wind turbine;

[0034] S2, obtaining the vibration data of each measuring point during the operation of the wind turbine;

[0035] S3, analyzing and processing the vibration data of each measuring point to obtain a processing result, and comparing the processing result with a preset threshold value, when the processing result is not within the preset threshold value, it is judged that the drive chain has abnormal vibration.

[0036] The application carries out the vibration measurement of the vibration state of the transmission chain of the wind turbine in the full-speed operation range, which is beneficial to the operation safety of the wind turbine, and based on the deep mining of the measurement data, the transmission chain of the running wind turbine is swept, and the structure and related parameters of the wind turbine transmission chain are further optimized.

[0037] In a specific embodiment, in step S1, according to the mechanical structure of the transmission chain, at least one measuring point is arranged on each level structure in three directions of XYZ, and the modal points found in the dynamic simulation are avoided, so as to ensure the reliability of data acquisition.

[0038] In a specific embodiment, the specific process of step S2 is as follows:

[0039] According to the wind turbine speed-power curve corresponding relationship table, the wind turbine is controlled to operate stably according to the wind turbine speed-power curve corresponding relationship table;

[0040] According to the wind turbine speed-power curve corresponding relationship table, when the wind turbine operates stably according to the speed-power curve corresponding relationship table, the vibration data of each measuring point is automatically collected;

[0041] According to the speed-power curve corresponding relationship table, the operating speed of the wind turbine is divided into N operating conditions to ensure the collection of N sets of vibration data.

[0042] In a specific embodiment, the specific process of step S3 is as follows:

[0043] The vibration data of each measuring point is analyzed and processed to obtain the effective value of the vibration data; wherein the vibration data includes vibration acceleration and vibration amplitude;

[0044] The effective value is compared with the preset threshold value, and when the effective value is not within the preset threshold value, it is judged that the transmission chain has abnormal vibration.

[0045] Further, when it is judged that the transmission chain has abnormal vibration, the vibration source is found, the vibration transmission path is determined, and then the modal vibration mode when the abnormal vibration occurs is determined according to the modal theory and the vibration equation, and then the dynamic simulation is carried out to determine whether the abnormal vibration will affect the performance of the component or system. If the abnormal vibration affects the performance of the component or system, the reason is analyzed through simulation and the exceeding phenomenon is reproduced, and then an optimization scheme of the vibration component parameters is issued, the vibration state after the optimization of the parameters is simulated on the simulation, it is confirmed that the vibration amplitude can be reduced, and then the optimization scheme is executed on the new product, and the vibration amplitude is reduced again through the sweep test.

[0046] The present application is suitable for a wide speed range, multi-component combined together running equipment, such as a wind turbine generator set; the present application is changed from a passive, periodic data acquisition mode to an additional acquisition device, an active wind turbine operation control mode and vibration data acquisition mode of the transmission chain under various working conditions, so as to realize the frequency sweep of the wind turbine generator set transmission chain; the vibration frequency sweep of a single working condition is changed to the frequency sweep according to the actual load of the wind turbine generator set, so as to guarantee the authenticity and reliability of the data; through the above method, it can be known whether the resonance will be caused in the running speed range of the equipment and whether the vibration will be excessive; through the continuous accumulation of the acceleration data of the wind turbine generator set transmission chain, not only the safe operation of the unit can be guaranteed, but also through the deep mining of the acceleration data of the transmission chain, it can be judged whether the vibration encountered by the wind turbine transmission chain is too large, so as to provide data support for predictive maintenance.

[0047] The embodiment of the present application also discloses a transmission chain frequency sweep system for running a wind turbine generator set, which comprises:

[0048] A first program module is used for selecting vibration measuring points of the transmission chain of the running wind turbine generator set;

[0049] A second program module is used for acquiring vibration data of each measuring point in the running process of the wind turbine generator set;

[0050] A third program module is used for analyzing and processing the vibration data of each measuring point to obtain a processing result, and comparing the processing result with a preset threshold value; when the processing result is not within the preset threshold value, it is judged that the transmission chain has abnormal vibration.

[0051] The transmission chain frequency sweep system for running a wind turbine generator set of the present application corresponds to the above-mentioned frequency sweep method and also has the advantages of the above-mentioned frequency sweep method.

[0052] The embodiment of the present application further discloses a computer readable storage medium, which stores a computer program; the computer program executes the steps of the above-mentioned method when being run by a processor. The embodiment of the present application also discloses a computer device, which comprises a memory and a processor; the memory stores a computer program; the computer program executes the steps of the above-mentioned method when being run by the processor.

[0053] The present application will be further described in detail in combination with a complete specific embodiment:

[0054] Firstly, a test system is built;

[0055] The test system building comprises main measuring point selection, measurement device (such as a sensor) test device installation to the wind turbine generator set transmission chain and debugging.

[0056] Measurement point selection: The selection of measurement points is crucial. The selected vibration measurement points should be able to reflect the true vibration state of the components or areas to be measured. Therefore, under the principle of "selecting the shortest transmission path and the maximum rigidity along the path", when selecting measurement points, at least one measurement point should be arranged in each level structure in XYZ three directions according to the mechanical structure of the transmission chain, and the modal points found in the dynamic simulation should be avoided.

[0057] For example, before sweeping the frequency of the wind turbine WT2500D146 model of the wind turbine transmission chain in Zhuzhou, it was found that the vibration in the "high-speed shaft middle shaft axial" area was significantly different during dynamic simulation. Therefore, when selecting this vibration measurement point, 8 measurement points were arranged in this area for vibration sweep test, and the Bode plot curves of the 8 measurement points were compared with the dynamic simulation (as shown in Figure 2 Under the same external factors, the maximum vibration acceleration is 9m / s 2 , and the minimum value is 3.1m / s 2 , which is consistent with the simulation. Therefore, the selection of measurement points, combined with the mechanical structure and dynamic simulation, can truly reflect the vibration state of the components or areas.

[0058] 2) Measurement equipment selection: According to the natural frequency of each component in the transmission chain, the rotation frequency of the rotating components, the meshing frequency of the gears, and other possible frequencies, select acceleration sensors and collection equipment that meet the frequency response.

[0059] 3) System installation and debugging: Complete the construction and debugging of the test system.

[0060] Second step, test data collection: The purpose of this step is to collect and store test data by controlling the operation of the wind turbine and collecting data according to the corresponding relationship table of the speed and power curve.

[0061] 1) Wind turbine operation control: According to the corresponding relationship table of the wind turbine speed and power curve, control the wind turbine to operate stably according to the corresponding relationship table of the wind turbine speed and power curve.

[0062] 2) Device collection control: According to the corresponding relationship table of the wind turbine speed and power curve, when the wind turbine operates stably according to the corresponding relationship table of the speed and power curve, control the device to automatically collect data.

[0063] 3) Complete data collection: According to the corresponding relationship table of the speed and power curve, divide the operating speed of the wind turbine into N operating conditions to ensure the collection of N sets of data.

[0064] Third step, test data analysis: Process and analyze the collected data according to the requirements of the vibration industry standard.

[0065] 1) Processing data: the collected data is processed according to the requirements of the vibration industry standard or national standard.

[0066] 2) Analysis data: the processed data is analyzed according to the requirements of the vibration industry standard or national standard.

[0067] 3) Whether the transmission chain vibration is resonance and exceeds the standard: according to the rotation frequency, meshing frequency and other analysis frequencies of the wind turbine transmission chain, the corresponding filter processing is carried out, and the effective value of vibration acceleration and speed is calculated; when the effective value exceeds the standard, abnormal vibration (such as resonance) may occur. For the vibration phenomenon found, the vibration source is found out, the vibration transmission path is determined, and then the modal shape when abnormal vibration occurs is determined according to the modal theory and vibration equation, and then the dynamics simulation is carried out to determine whether the abnormal vibration will affect the performance of the component or system; otherwise, if the effective value of vibration acceleration and speed does not exceed the standard, the unit continues to run.

[0068] 4) If the transmission chain vibration is judged and exceeds the standard, analyze the reason and whether the reason affects the long-term operation of the unit, and continue to run if it does not affect.

[0069] 5) Transmission chain vibration and exceeding the standard, analyze the reason through simulation and reproduce the exceeding standard phenomenon, then provide an optimization scheme of vibration component parameters, simulate the vibration state after optimization of parameters on simulation, confirm that the vibration amplitude can be reduced, then execute the optimization scheme on new products, and test again to confirm that the vibration amplitude has been reduced. For example, after the X type wind turbine transmission chain sweep frequency test, it is found that the acceleration vibration value of the high speed stage of the gearbox (10.433 m / s 2 ) exceeds the standard, after diagnosis and analysis, the excitation source is the meshing frequency inside the gearbox, then the vibration is reproduced through simulation, then the gearbox internal model parameters are optimized through simulation, the expected effect is achieved in simulation, then the gearbox internal model parameters are modified according to the simulation in the actual product, and the test is carried out again, the acceleration vibration value of the high speed stage of the gearbox (3.89 m / s 2 ) does not exceed the standard, and the vibration amplitude reduction ratio is 63%, as shown in Figure 3 .

[0070] As shown in the present disclosure and claims, unless the context clearly indicates otherwise, the words "one", "an", "a", and / or "the" do not mean only singular, but also include plural. The words "first", "second", and similar words used in the present disclosure do not indicate any order, number, or importance, but are only used to distinguish different components. Similarly, the words "include" or "contain" and similar words mean that the components or objects before the words cover the components or objects listed after the words and their equivalents, and do not exclude other components or objects. The words "connect" or "connected" and similar words are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0071] The above is only the preferred embodiment of the present application, and the protection scope of the present application is not limited to the above-mentioned embodiments. Any technical solutions falling within the concept of the present application shall fall within the protection scope of the present application. It should be noted that, for ordinary skilled persons in the art, some improvements and refinements without departing from the principles of the present application shall be considered as falling within the protection scope of the present application.

Claims

1. A method for sweeping the frequency of the transmission chain in an operating wind turbine generator, characterized in that, Including the following steps: S1. Select vibration measurement points for the transmission chain of the operating wind turbine; S2. During the operation of the wind turbine, acquire vibration data at each measuring point; S3. Analyze and process the vibration data of each measuring point to obtain the processing result. Compare the processing result with a preset threshold. If the processing result is not within the preset threshold, it is determined that the transmission chain has abnormal vibration. The specific process of step S2 is as follows: Based on the wind turbine speed-power curve correspondence table, control the wind turbine to operate stably according to the wind turbine speed-power curve correspondence table; According to the wind turbine speed-power curve correspondence table, once the wind turbine is running stably according to the speed-power curve correspondence table, vibration data at each measuring point will be automatically collected. Based on the speed-power curve correspondence table, the operating speed of the wind turbine is divided into N operating conditions to ensure the collection of N sets of vibration data.

2. The transmission chain frequency sweeping method for operating wind turbine units according to claim 1, characterized in that, In step S1, based on the principle of "selecting the shortest transmission path and the greatest rigidity along the path", at least one measuring point is arranged in each of the three directions XYZ on each stage of the transmission chain according to the mechanical structure of the transmission chain, and the modal points already found in the dynamic simulation are avoided.

3. The transmission chain frequency sweeping method for operating wind turbine units according to claim 1 or 2, characterized in that, The specific process of step S3 is as follows: The vibration data from each measuring point are analyzed and processed to obtain the effective values ​​of the vibration data; the vibration data includes vibration acceleration and vibration amplitude. The effective value is compared with a preset threshold. If the effective value is not within the preset threshold, it is determined that the transmission chain has abnormal vibration.

4. The transmission chain frequency sweeping method for operating wind turbine units according to claim 3, characterized in that, When abnormal records are detected in the transmission chain, the vibration source is identified and the vibration transmission path is determined based on modal theory and vibration equations. Then, the mode shape at the time of abnormal vibration is determined, and dynamic simulation is performed to determine whether the abnormal vibration will affect the performance of the component or system. If the abnormal vibration affects the performance of the component or system, the cause is analyzed through simulation and the phenomenon exceeding the standard is reproduced. Then, an optimization scheme for the parameters of the vibrating component is proposed. The vibration state after the optimization parameters is simulated in the simulation to confirm that the vibration amplitude can be reduced. Then, the optimization scheme is implemented on the new product, and the vibration amplitude is confirmed to have been reduced by a frequency sweep test.

5. A drivetrain frequency sweep system for operating a wind turbine generator, used to perform the steps of the drivetrain frequency sweep method for operating a wind turbine generator as described in any one of claims 1-4, characterized in that, include: The first program module is used to select vibration measurement points for the transmission chain of the operating wind turbine. The second program module is used to acquire vibration data at various measuring points during the operation of the wind turbine. The third program module is used to analyze and process the vibration data of each measuring point, obtain the processing result, compare the processing result with a preset threshold, and determine that the transmission chain has abnormal vibration when the processing result is not within the preset threshold.

6. A computer-readable storage medium having a computer program stored thereon, characterized in that, The computer program, when run by a processor, performs the steps of the method as described in any one of claims 1 to 4.

7. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, The computer program, when run by a processor, performs the steps of the method as described in any one of claims 1 to 4.

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