Method for evaluating influence degree of water turbine generator rotor vibration on stator low frequency vibration
By collecting and analyzing the vibration waveforms of the stator and rotor of the hydro-generator, decomposing them into fundamental and harmonic waves, it was determined whether the low-frequency vibration of the stator was caused by the vibration of the rotor. By adjusting the rotor magnetic poles to correct the result, the problem of rapid identification of low-frequency vibration of the stator was solved, improving the efficiency of fault finding and economic benefits.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- HUANENG LANCANG RIVER HYDROPOWER CO LTD
- Filing Date
- 2025-04-24
- Publication Date
- 2026-05-19
AI Technical Summary
Low-frequency vibrations may occur in the stator during the operation of a hydro-generator, which may be caused by rotor vibration. This can lead to stator core loosening, inter-laminar short circuits, and winding insulation wear. It is necessary to quickly identify and suppress the cause.
By collecting the vibration waveforms of the stator and rotor, decomposing them into fundamental and harmonic waves, determining the phase relationship and vibration amplitude, and judging whether the low-frequency vibration of the stator is caused by the vibration of the rotor, the rotor magnetic poles are adjusted if necessary to correct the results.
Quickly and effectively assess the causes of low-frequency stator vibration, shorten fault finding and handling time, reduce hydropower unit downtime, and improve economic efficiency.
Smart Images
Figure CN120387810B_ABST
Abstract
Description
Technical Field
[0001] This disclosure relates to the field of hydro-generator technology, and in particular to a method for evaluating the degree of influence of hydro-generator rotor vibration on stator low-frequency vibration. Background Technology
[0002] Low-frequency vibration occurs in the stator core during the operation of hydro-generators. When the vibration is too severe, it can easily lead to a series of problems such as loosening of stator core laminations, short circuits between laminations, and wear of stator winding insulation. Therefore, once excessive stator vibration occurs, it is essential to find the cause in time and effectively suppress the low-frequency stator vibration.
[0003] During the operation of a hydro-generator, the rotor also vibrates, causing the rotor center to deviate from the generator center, resulting in an eccentricity. This eccentricity leads to an asymmetry in the generator's magnetic field, further generating an asymmetric distribution of electromagnetic forces acting on the stator core, which may be one of the causes of stator vibration. Therefore, if it can be determined whether the low-frequency stator vibration is caused by rotor vibration, interference factors can be reduced, facilitating the rapid identification of the inducing cause of the low-frequency stator vibration and the implementation of targeted treatment measures. Summary of the Invention
[0004] This disclosure aims to at least partially address one of the technical problems in the related art.
[0005] Therefore, the first aspect of this disclosure proposes a method for evaluating the degree of influence of rotor vibration on low-frequency stator vibration of a hydro-generator, comprising:
[0006] S1, using vibration sensors to collect the first vibration waveform of the stator and the second vibration waveform of the rotor in the hydro-generator;
[0007] S2, decompose the first vibration waveform and the second vibration waveform respectively to obtain the first fundamental wave and the first harmonic of the first vibration waveform, and the second fundamental wave and the second harmonic of the second vibration waveform;
[0008] S3, determine the first phase relationship between the first fundamental wave and the second fundamental wave, and the second phase relationship between the first harmonic and the second harmonic;
[0009] S4, sort the first fundamental wave and the first harmonic wave based on the magnitude of the waveform vibration amplitude to obtain the first sorting result;
[0010] S5, Sort the second fundamental wave and the second harmonic wave according to the magnitude of the waveform vibration amplitude to obtain the second sorting result;
[0011] S6, in response to the first phase relationship being in phase, the second phase relationship being in phase, and the first sorting result being consistent with the second sorting result, the cause of the low-frequency vibration of the stator is determined to be rotor vibration.
[0012] In some embodiments of this disclosure, the second vibration waveform of the rotor includes the vibration waveform of the upper guide bearing and / or the vibration waveform of the lower guide bearing.
[0013] In some embodiments of this disclosure, the first harmonic includes at least one of the second, third, fourth, fifth, and sixth harmonics of the first vibration waveform; the second harmonic includes at least one of the second, third, fourth, fifth, and sixth harmonics of the second vibration waveform.
[0014] In some embodiments of this disclosure, the method further includes: adjusting the rotor magnetic poles of the hydro-generator, repeating steps S1-S5 after adjustment, and correcting the causes of low-frequency vibration of the stator based on the adjusted first phase relationship, second phase relationship, first sorting result and second sorting result.
[0015] A second aspect of this disclosure provides an apparatus for evaluating the degree of influence of rotor vibration on low-frequency stator vibration of a hydro-generator, comprising:
[0016] The acquisition module is used to acquire the first vibration waveform of the stator and the second vibration waveform of the rotor in the hydro-generator using vibration sensors;
[0017] The decomposition module is used to decompose the first vibration waveform and the second vibration waveform respectively to obtain the first fundamental wave and the first harmonic of the first vibration waveform, and the second fundamental wave and the second harmonic of the second vibration waveform.
[0018] The first determining module is used to determine a first phase relationship between the first fundamental wave and the second fundamental wave, and a second phase relationship between the first harmonic and the second harmonic;
[0019] The second determining module is used to sort the first fundamental wave and the first harmonic wave based on the magnitude of the waveform vibration amplitude to obtain a first sorting result;
[0020] The third determining module is used to sort the second fundamental wave and the second harmonic wave based on the magnitude of the waveform vibration amplitude to obtain a second sorting result;
[0021] The fourth determining module is used to determine that the cause of the low-frequency vibration of the stator is rotor vibration in response to the first phase relationship being in phase, the second phase relationship being in phase, and the first sorting result being consistent with the second sorting result.
[0022] In some embodiments of this disclosure, the second vibration waveform of the rotor includes the vibration waveform of the upper guide bearing and the vibration waveform of the lower guide bearing.
[0023] In some embodiments of this disclosure, the first harmonic includes at least one of the second, third, fourth, fifth, and sixth harmonics of the first vibration waveform; the second harmonic includes at least one of the second, third, fourth, fifth, and sixth harmonics of the second vibration waveform.
[0024] In some embodiments of this disclosure, the device further includes an adjustment module; wherein the adjustment module is used to: adjust the rotor magnetic poles of the hydro-generator, and correct the causes of low-frequency vibration of the stator based on the adjusted first phase relationship, second phase relationship, first sorting result and second sorting result.
[0025] A third aspect of this disclosure provides an electronic device, including: a processor, and a memory communicatively connected to the processor;
[0026] The memory stores computer-executed instructions;
[0027] The processor executes computer execution instructions stored in the memory to implement the method described in the first aspect above.
[0028] A fourth aspect of this disclosure provides a computer-readable storage medium, characterized in that the computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method described in the first aspect above.
[0029] The method for assessing the impact of rotor vibration on low-frequency stator vibration of hydro-generator provided in this disclosure can quickly and effectively assess whether the low-frequency stator vibration is caused by the rotor based on the vibration waveforms of the stator and rotor. It can quickly identify the cause of the fault, and the method is simple and easy to implement. It helps to narrow the scope of fault search, shorten the fault finding and handling time, reduce the downtime of hydro-generator units, and improve their economic benefits.
[0030] Additional aspects and advantages of this disclosure will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this disclosure. Attached Figure Description
[0031] The above and / or additional aspects and advantages of this disclosure will become apparent and readily understood from the following description of the embodiments taken in conjunction with the accompanying drawings, in which:
[0032] Figure 1This is a flowchart illustrating a method for evaluating the influence of rotor vibration on low-frequency stator vibration of a hydro-generator, as provided in an embodiment of this disclosure.
[0033] Figure 2 A schematic diagram of a first vibration waveform of a stator provided in an embodiment of this disclosure;
[0034] Figure 3 This is a schematic diagram of the vibration waveform of an upper guide bearing provided in an embodiment of the present disclosure;
[0035] Figure 4 This is a schematic diagram of the vibration waveform of a lower guide bearing provided in an embodiment of the present disclosure;
[0036] Figure 5 A schematic diagram of the first vibration waveform of the stator after the first adjustment, provided in an embodiment of this disclosure;
[0037] Figure 6 A schematic diagram of the vibration waveform of the upper guide bearing after the first adjustment, provided in an embodiment of this disclosure;
[0038] Figure 7 A schematic diagram of the vibration waveform of the lower guide bearing after the first adjustment, provided in an embodiment of this disclosure;
[0039] Figure 8 A schematic diagram of the first vibration waveform of a stator after a second adjustment, provided in an embodiment of this disclosure;
[0040] Figure 9 A schematic diagram of the vibration waveform of the upper guide bearing after a second adjustment, provided in an embodiment of this disclosure;
[0041] Figure 10 A schematic diagram of the vibration waveform of the lower guide bearing after a second adjustment, provided in an embodiment of this disclosure;
[0042] Figure 11 A schematic diagram of the first vibration waveform of a stator after a second adjustment, provided in an embodiment of this disclosure;
[0043] Figure 12 A schematic diagram of the vibration waveform of the upper guide bearing after a second adjustment, provided in an embodiment of this disclosure;
[0044] Figure 13 A schematic diagram of the vibration waveform of the lower guide bearing after a second adjustment, provided in an embodiment of this disclosure;
[0045] Figure 14 A schematic diagram of the first vibration waveform of a stator after a second adjustment, provided in an embodiment of this disclosure;
[0046] Figure 15A schematic diagram of the vibration waveform of the upper guide bearing after a second adjustment, provided in an embodiment of this disclosure;
[0047] Figure 16 A schematic diagram of the vibration waveform of the lower guide bearing after a second adjustment, provided in an embodiment of this disclosure;
[0048] Figure 17 This is a schematic diagram of an evaluation device for assessing the influence of rotor vibration on low-frequency stator vibration of a hydro-generator, provided in an embodiment of this disclosure. Detailed Implementation
[0049] Embodiments of this disclosure are described in detail below, examples of which are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this disclosure, and should not be construed as limiting this disclosure.
[0050] Specifically, the following describes a method for evaluating the influence of turbine generator rotor vibration on low-frequency stator vibration according to an embodiment of the present disclosure, with reference to the accompanying drawings.
[0051] Figure 1 This is a flowchart illustrating a method for evaluating the influence of rotor vibration on low-frequency stator vibration of a hydro-generator, as provided in an embodiment of this disclosure. Figure 1 As shown, the method for assessing the impact of rotor vibration on low-frequency stator vibration of the hydro-generator may include the following steps:
[0052] Step S1: Use vibration sensors to collect the first vibration waveform of the stator and the second vibration waveform of the rotor in the hydro-generator.
[0053] Optionally, in some embodiments of this disclosure, the stator vibration waveform can be represented by the stator housing vibration, and the rotor vibration waveform can be represented by the vibration of the upper guide bearing and / or the lower guide bearing in the hydro-generator. For example, the second vibration waveform of the rotor may include the vibration waveform of the upper guide bearing and / or the vibration waveform of the lower guide bearing. To improve the accuracy of determining the cause of stator vibration, the vibration waveforms of the upper guide bearing and the lower guide bearing can be used simultaneously for determination.
[0054] It should be noted that the first vibration waveform of the stator and the second vibration waveform of the rotor are the stator vibration waveform and rotor vibration waveform of the hydro-generator in the same position.
[0055] Step S2: Decompose the first vibration waveform and the second vibration waveform respectively to obtain the first fundamental wave and the first harmonic of the first vibration waveform, and the second fundamental wave and the second harmonic of the second vibration waveform.
[0056] Optionally, when decomposing the vibration waveform, multiple harmonics can be acquired for comprehensive judgment to improve the accuracy of the judgment. As an example, the first harmonic may include at least one of the second, third, fourth, fifth, and sixth harmonics of the first vibration waveform, and the second harmonic may include at least one of the second, third, fourth, fifth, and sixth harmonics of the second vibration waveform.
[0057] Figure 2 This is a schematic diagram of the first vibration waveform of a stator provided in an embodiment of the present disclosure. Figure 3 This is a schematic diagram of the vibration waveform of an upper guide bearing provided in an embodiment of this disclosure. Figure 4 This is a schematic diagram of the vibration waveform of a lower guide bearing provided in an embodiment of this disclosure. Figure 2 , Figure 3 and Figure 4 As shown, the vibration waveforms of the stator, upper guide bearing, and lower guide bearing can be decomposed into the fundamental wave, second harmonic, third harmonic, fourth harmonic, fifth harmonic, and sixth harmonic, respectively.
[0058] Step S3: Determine the first phase relationship between the first fundamental wave and the second fundamental wave, and the second phase relationship between the first harmonic and the second harmonic.
[0059] by Figure 2 , Figure 3 and Figure 4 For example, it can be determined that the first fundamental wave of the stator and the second fundamental wave of the upper (or lower) guide bearing are out of phase, while the fundamental waves of the upper and lower guide bearings are basically in phase. The phase relationship between harmonics is similar.
[0060] Step S4: Sort the first fundamental wave and the first harmonic wave according to the magnitude of the waveform vibration amplitude to obtain the first sorting result.
[0061] Step S5: Sort the second fundamental wave and the second harmonic wave according to the magnitude of the waveform vibration amplitude to obtain the second sorting result.
[0062] by Figure 2 , Figure 3 and Figure 4 For example, it can be determined that the second harmonic of the stator is the largest, while the first fundamental wave is relatively small, and the fundamental wave amplitude of the rotor vibration is the largest, followed by the second harmonic. Therefore, it can be determined that there is a difference between the first and second sorting results.
[0063] Step S6: In response to the first phase relationship being in phase, the second phase relationship being in phase, and the first sorting result being consistent with the second sorting result, the cause of the low-frequency vibration of the stator is determined to be the rotor vibration.
[0064] When the vibration waveforms of the stator and rotor simultaneously satisfy the condition that the fundamental wave is in phase, the harmonic wave is in phase, and the amplitude order of the waveforms is the same, it can be confirmed that the stator and rotor vibrations are highly correlated, and the cause of the low-frequency stator vibration can be determined as rotor vibration. Targeted measures can then be taken in a timely manner to reduce the impact on the stator. Conversely, if the conditions are not met, it indicates that the correlation between the stator and rotor vibrations is not high, and the cause of rotor vibration can be quickly eliminated, facilitating the timely investigation of other stator vibration causes such as magnetic pole out-of-roundness and short circuits between rotor winding turns.
[0065] Optionally, in order to avoid the randomness of the test and improve the accuracy of the determination of the stator vibration cause, in some embodiments of this disclosure, the rotor magnetic poles of the hydro generator can be adjusted multiple times, and the stator vibration cause can be determined again after adjustment to see if it is rotor vibration.
[0066] In one implementation, the rotor magnetic poles of the hydro generator are adjusted, and after adjustment, steps S1-S5 are repeated. Based on the adjusted first phase relationship, second phase relationship, first sorting result and second sorting result, the causes of low-frequency vibration of the stator are corrected. Figure 5 This is a schematic diagram of the first vibration waveform of the stator after the first adjustment, provided in an embodiment of this disclosure. Figure 6 This is a schematic diagram of the vibration waveform of the upper guide bearing after the first adjustment, provided in an embodiment of this disclosure. Figure 7 This is a schematic diagram of the vibration waveform of the lower guide bearing after the first adjustment, provided in an embodiment of this disclosure. Figure 5 , Figure 6 and Figure 7 As shown, the fundamental frequencies of the upper and lower guide bearing vibrations are basically in phase, while they are approximately out of phase with the fundamental frequency of the stator vibration. The second harmonic vibrations of the upper and lower guide bearings have a significant phase difference, while the second harmonic vibration of the stator is basically in phase with that of the upper guide bearing. The fundamental frequency of the rotor vibration has the largest amplitude, followed by the second harmonic, while the second harmonic of the stator vibration has the largest amplitude and the fundamental frequency is relatively small. This indicates that the correlation between the stator and rotor vibrations is not high, confirming that the cause of the low-frequency stator vibration is not rotor vibration.
[0067] Further adjustments were made to the generator's rotor poles for the second time. Figure 8 This is a schematic diagram of the first vibration waveform of a stator after a second adjustment, provided in an embodiment of this disclosure. Figure 9 This is a schematic diagram of the vibration waveform of the upper guide bearing after a second adjustment, provided in an embodiment of this disclosure. Figure 10 This is a schematic diagram of the vibration waveform of the lower guide bearing after a second adjustment, provided as an embodiment of this disclosure. Figure 8 , Figure 9 and Figure 10As shown, the fundamental amplitude of rotor vibration is the largest, followed by the second harmonic, while the second harmonic of stator vibration is the largest, and the fundamental amplitude is relatively small. This indicates that the correlation between stator and rotor vibrations is not high. The fundamental waves of the upper and lower guide bearing vibrations are no longer in phase, and are also different from the fundamental wave of stator vibration. The phase difference of the second harmonic vibrations of the upper and lower guide bearings is also large, while the phase of the second harmonic of stator vibration is basically in phase with that of the upper guide bearing, confirming that the cause of the low-frequency stator vibration is not rotor vibration.
[0068] The generator underwent a third rotor pole adjustment. Figure 11 This is a schematic diagram of the first vibration waveform of a stator after a second adjustment, provided in an embodiment of this disclosure. Figure 12 This is a schematic diagram of the vibration waveform of the upper guide bearing after a second adjustment, provided in an embodiment of this disclosure. Figure 13 This is a schematic diagram of the vibration waveform of the lower guide bearing after a second adjustment, provided as an embodiment of this disclosure. Figure 11 , Figure 12 and Figure 13 As shown, the fundamental amplitude of rotor vibration is the largest, followed by the second harmonic, while the second harmonic of stator vibration is the largest, and the fundamental amplitude is relatively small, indicating that the correlation between stator and rotor vibrations is not high. The fundamental phases of the upper and lower guide bearing vibrations are different from those of the stator fundamental vibration. The phase difference of the second harmonic vibrations of the upper and lower guide bearings is also significant, and they are also different from those of the stator second harmonic vibration, confirming that the cause of the low-frequency stator vibration is not rotor vibration.
[0069] The generator underwent a fourth rotor pole adjustment. Figure 14 This is a schematic diagram of the first vibration waveform of a stator after a second adjustment, provided in an embodiment of this disclosure. Figure 15 This is a schematic diagram of the vibration waveform of the upper guide bearing after a second adjustment, provided in an embodiment of this disclosure. Figure 16 This is a schematic diagram of the vibration waveform of the lower guide bearing after a second adjustment, provided as an embodiment of this disclosure. Figure 14 , Figure 15 and Figure 16 As shown, the fundamental frequency amplitude of the rotor vibration is the largest, followed by the second harmonic, while the second harmonic amplitude of the stator vibration is the largest, and the fundamental frequency amplitude is relatively small, indicating that the correlation between the stator and rotor vibrations is not high. The fundamental frequencies of the upper and lower guide bearing vibrations are in different phases, and also in different phases from the fundamental frequency of the stator vibration. The phase difference of the second harmonic vibrations of the upper and lower guide bearings is also relatively large, while the phases of the second harmonic vibrations of the upper guide bearing and the stator vibration are basically the same. Based on the vibration results after each adjustment, it can be concluded that there is no fixed correlation in amplitude or phase between the corresponding harmonics in the stator low-frequency vibration and the rotor vibration. Therefore, it can be determined that the rotor vibration has a very weak influence on the stator low-frequency vibration and is not the main cause of the stator low-frequency vibration.
[0070] By implementing the embodiments of this disclosure, it is possible to quickly and effectively assess whether the low-frequency vibration of the stator is caused by the rotor based on the vibration waveforms of the stator and rotor. This enables rapid troubleshooting of fault causes. The implementation method is simple and easy to implement, which helps to reduce the scope of fault search, shorten the fault finding and handling time, reduce the downtime of hydropower units, and improve their economic benefits.
[0071] Figure 17 This is a schematic diagram of an assessment device for the influence of rotor vibration on low-frequency stator vibration of a hydro-generator, provided in an embodiment of this disclosure. Figure 17 As shown, the device for assessing the impact of rotor vibration on low-frequency stator vibration of the hydro-generator includes: acquisition module 171, decomposition module 172, first determination module 173, second determination module 174, third determination module 175 and fourth determination module 176.
[0072] Among them, the acquisition module 171 is used to acquire the first vibration waveform of the stator and the second vibration waveform of the rotor in the hydro-generator using a vibration sensor.
[0073] The decomposition module 172 is used to decompose the first vibration waveform and the second vibration waveform respectively to obtain the first fundamental wave and the first harmonic of the first vibration waveform, and the second fundamental wave and the second harmonic of the second vibration waveform.
[0074] The first determining module 173 is used to determine the first phase relationship between the first fundamental wave and the second fundamental wave, and the second phase relationship between the first harmonic and the second harmonic.
[0075] The second determining module 174 is used to sort the first fundamental wave and the first harmonic wave based on the magnitude of the waveform vibration amplitude to obtain the first sorting result.
[0076] The third determining module 175 is used to sort the second fundamental wave and the second harmonic wave based on the magnitude of the waveform vibration amplitude to obtain the second sorting result.
[0077] The fourth determining module 176 is used to determine that the cause of the low-frequency vibration of the stator is rotor vibration in response to the first phase relationship being in phase, the second phase relationship being in phase, and the first sorting result being consistent with the second sorting result.
[0078] In some embodiments of this disclosure, the second vibration waveform of the rotor includes the vibration waveform of the upper guide bearing and the vibration waveform of the lower guide bearing.
[0079] In some embodiments of this disclosure, the first harmonic includes at least one of the second, third, fourth, fifth, and sixth harmonics of the first vibration waveform; the second harmonic includes at least one of the second, third, fourth, fifth, and sixth harmonics of the second vibration waveform.
[0080] In some embodiments of this disclosure, such as Figure 17 Based on the illustrated embodiment, the evaluation device may further include an adjustment module. The adjustment module is used to: adjust the rotor magnetic poles of the hydro-generator; and, based on the adjusted first phase relationship, second phase relationship, first sorting result, and second sorting result, correct the causes of low-frequency stator vibration.
[0081] Regarding the apparatus in the above embodiments, the specific manner in which each module performs its operation has been described in detail in the embodiments related to the method, and will not be elaborated upon here.
[0082] To implement the above embodiments, this disclosure also proposes an electronic device, including: a processor and a memory communicatively connected to the processor; the memory stores computer execution instructions; the processor executes the computer execution instructions stored in the memory to implement the method provided in the foregoing embodiments.
[0083] To implement the above embodiments, this disclosure also proposes a computer-readable storage medium storing computer-executable instructions, which, when executed by a processor, are used to implement the methods provided in the foregoing embodiments.
[0084] To implement the above embodiments, this disclosure also proposes a computer program product, including a computer program that, when executed by a processor, implements the methods provided in the foregoing embodiments.
[0085] In the foregoing descriptions of the embodiments, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this disclosure. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.
[0086] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.
[0087] Any process or method description in the flowchart or otherwise herein can be understood as representing a module, segment, or portion of code comprising one or more executable instructions for implementing custom logic functions or processes, and the scope of preferred embodiments of this disclosure includes additional implementations in which functions may be performed not in the order shown or discussed, including substantially simultaneously or in reverse order depending on the functions involved, as will be understood by those skilled in the art to which embodiments of this disclosure pertain.
[0088] The logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.
[0089] It should be understood that various parts of this disclosure can be implemented using hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented using software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.
[0090] Those skilled in the art will understand that all or part of the steps of the methods in the above embodiments can be implemented by a program instructing related hardware. The program can be stored in a computer-readable storage medium, and when executed, the program includes one or a combination of the steps of the method embodiments.
[0091] Furthermore, the functional units in the various embodiments of this disclosure can be integrated into a processing module, or each unit can exist physically separately, or two or more units can be integrated into a module. The integrated module can be implemented in hardware or as a software functional module. If the integrated module is implemented as a software functional module and sold or used as an independent product, it can also be stored in a computer-readable storage medium.
[0092] The storage medium mentioned above can be a read-only memory, a disk, or an optical disk, etc. Although embodiments of the present disclosure have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present disclosure. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present disclosure.
Claims
1. A method for evaluating the degree of influence of rotor vibration on low-frequency stator vibration of a hydro-generator, characterized in that, Includes the following steps: S1, using vibration sensors to collect the first vibration waveform of the stator and the second vibration waveform of the rotor in the hydro-generator; S2, decompose the first vibration waveform and the second vibration waveform respectively to obtain the first fundamental wave and the first harmonic of the first vibration waveform, and the second fundamental wave and the second harmonic of the second vibration waveform; S3, determine the first phase relationship between the first fundamental wave and the second fundamental wave, and the second phase relationship between the first harmonic and the second harmonic; S4, sort the first fundamental wave and the first harmonic wave based on the magnitude of the waveform vibration amplitude to obtain the first sorting result; S5, Sort the second fundamental wave and the second harmonic wave according to the magnitude of the waveform vibration amplitude to obtain the second sorting result; S6, in response to the first phase relationship being in phase, the second phase relationship being in phase, and the first sorting result being consistent with the second sorting result, the cause of the low-frequency vibration of the stator is determined to be rotor vibration; Also includes: The rotor magnetic poles of the hydro-generator are adjusted, and steps S1-S5 are repeated after adjustment. Based on the adjusted first phase relationship, second phase relationship, first sorting result and second sorting result, the causes of low-frequency vibration of the stator are corrected.
2. The method as described in claim 1, characterized in that, The second vibration waveform of the rotor includes the vibration waveform of the upper guide bearing and / or the vibration waveform of the lower guide bearing.
3. The method as described in claim 1, characterized in that, The first harmonic includes at least one of the second, third, fourth, fifth, and sixth harmonics of the first vibration waveform; The second harmonic includes at least one of the second, third, fourth, fifth, and sixth harmonics of the second vibration waveform.
4. A device for evaluating the degree of influence of rotor vibration on low-frequency stator vibration of a hydro-generator, characterized in that, include: The acquisition module is used to acquire the first vibration waveform of the stator and the second vibration waveform of the rotor in the hydro-generator using vibration sensors; The decomposition module is used to decompose the first vibration waveform and the second vibration waveform respectively to obtain the first fundamental wave and the first harmonic of the first vibration waveform, and the second fundamental wave and the second harmonic of the second vibration waveform. The first determining module is used to determine a first phase relationship between the first fundamental wave and the second fundamental wave, and a second phase relationship between the first harmonic and the second harmonic; The second determining module is used to sort the first fundamental wave and the first harmonic wave based on the magnitude of the waveform vibration amplitude to obtain a first sorting result; The third determining module is used to sort the second fundamental wave and the second harmonic wave based on the magnitude of the waveform vibration amplitude to obtain a second sorting result; The fourth determining module is used to determine that the cause of the low-frequency vibration of the stator is rotor vibration in response to the first phase relationship being in phase, the second phase relationship being in phase, and the first sorting result being consistent with the second sorting result. It also includes an adjustment module; wherein the adjustment module is used for: The rotor magnetic poles of the hydro-generator are adjusted, and the causes of low-frequency vibration of the stator are corrected based on the adjusted first phase relationship, second phase relationship, first sorting result, and second sorting result.
5. The apparatus as described in claim 4, characterized in that, The second vibration waveform of the rotor includes the vibration waveform of the upper guide bearing and the vibration waveform of the lower guide bearing.
6. The apparatus as claimed in claim 4, characterized in that, The first harmonic includes at least one of the second, third, fourth, fifth, and sixth harmonics of the first vibration waveform; The second harmonic includes at least one of the second, third, fourth, fifth, and sixth harmonics of the second vibration waveform.
7. An electronic device, characterized in that, include: A processor, and a memory communicatively connected to the processor; The memory stores computer-executed instructions; The processor executes computer execution instructions stored in the memory to implement the method as described in any one of claims 1-3.
8. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer-executable instructions, which, when executed by a processor, are used to implement the method as described in any one of claims 1-3.