CN103116032A - Method and device for acquiring rotating speed of wind generating set - Google Patents
Method and device for acquiring rotating speed of wind generating set Download PDFInfo
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- CN103116032A CN103116032A CN2013100199025A CN201310019902A CN103116032A CN 103116032 A CN103116032 A CN 103116032A CN 2013100199025 A CN2013100199025 A CN 2013100199025A CN 201310019902 A CN201310019902 A CN 201310019902A CN 103116032 A CN103116032 A CN 103116032A
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Abstract
A method and an apparatus for obtaining a rotational speed of a wind turbine generator set are provided. The method comprises the steps of carrying out band-pass filtering on vibration data of the wind driven generator in a time domain; carrying out envelope detection on the data subjected to band-pass filtering; transforming the envelope detected data to a frequency domain; processing the data of the frequency domain by searching a peak value so as to obtain a tooth space frequency of a preset multiple; the rotational speed of the generator is obtained from the obtained cogging frequency using the following equation, Fs ═ k × n, where Fs is the cogging frequency, k is the number of cogging of the generator, and n is the rotational speed of the generator. According to the method for acquiring the rotating speed of the generator set, the rotating speed acquisition precision can be improved. In addition, the rotation speed is directly extracted from the vibration data, so that the consistency of the vibration data and the rotation speed data on time sequence can be strictly ensured. In addition, no special equipment for measuring the rotating speed is needed, so that the equipment cost and the implementation cost of the rotating speed test are reduced to zero.
Description
Technical field
The present invention relates to technical field of wind power generation, more particularly, relate to a kind of method and apparatus that obtains the rotating speed of wind power generating set based on vibration data.
Background technology
Along with the development of wind generating technology, the wind power generating set of main flow all is designed to variable-speed operation now, and when wind power generating set broke down, in most cases corresponding vibration performance (especially frequency domain character) and the rotating speed of fault had direct corresponding relation.Therefore, status monitoring and fault diagnosis system are when carrying out Vibration Condition Monitoring and fault diagnosis to the wind power generating set of variable-speed operation, and tachometric survey is a very important job, and the precision of tachometric survey directly affects the confidence level of vibrating data analysis result.
Fig. 1 illustrates the schematic diagram according to the method for the rotating speed that obtains wind power generating set of prior art.As shown in Figure 1, speed probe 10 (for example, photoelectric sensor, magneto-dependent sensor etc.) is arranged on stationary parts, aims at rotary part 30 (for example, turning axle); Arrange one or more tacho-pulse triggered mark 20 (as reflecting strips, outstanding derby etc.) on rotary part 30.Follow rotary part 30 rotation and during over against speed probe 10, speed probe 10 will export a pulse when tacho-pulse triggered mark 20, vibration analysis system 40 is according to the rotating speed of the current rotary part 30 of time interval calculating of acquisition pulse.
Simultaneously, as shown in Figure 1, vibration analysis system 40 obtains vibration data according to vibration transducer 50.
Be by carrying out exchanges data with master control system, read the rotary speed data in master control system according to another method of obtaining the rotating speed of wind power generating set of prior art, thereby obtain vibrating data collection tachometer value constantly.
But, technical scheme according to the rotating speed that obtains wind power generating set of prior art, because needs are installed independent speed probe or need to carry out exchanges data with master control system, so increased system cost and this exchanges data has increased again the master control system risk; Because the rotating speed of wind power generating set is extremely low, so larger based on the measuring error of prior art scheme; In case the clock of master control system and status monitoring and fault diagnosis system is inconsistent, the vibration data that gathers and rotary speed data just can not be corresponding on sequential.
Summary of the invention
In order to solve at least one problem or the other problem in the above-mentioned problems in the prior art, provide a kind of technical scheme of obtaining the rotating speed of wind power generating set based on vibration data.
According to the method for a kind of rotating speed be used to obtaining wind power generating set of exemplary embodiment of the present invention, following steps: the vibration data to the aerogenerator of time domain carries out bandpass filtering; Data to bandpass filtering are carried out envelope detected; Will be through the data transformation of envelope detected to frequency domain; The data of frequency domain are carried out the processing of search peak, thereby obtain the teeth groove frequency of prearranged multiple; Obtain the rotating speed of generator with following equation according to the teeth groove frequency that obtains, Fs=k * n, wherein, Fs is the teeth groove frequency, and k is the quantity of the teeth groove of generator, and n is the rotating speed of generator.
Preferably, will be through the data transformation of envelope detected to frequency domain by Fast Fourier Transform (FFT).
Preferably, by vibration transducer or by with the communicating by letter of master control system, obtain the vibration data of the aerogenerator of described time domain.
Preferably, by the constant bandwidth digital band-pass filter, vibration data is carried out bandpass filtering.
Preferably, the frequency range of the extraction of described constant bandwidth digital band-pass filter is set to the frequency range of 2 frequencys multiplication of teeth groove frequency.
Preferably, carry out digital envelope detection by the data after the Hilbert transform pairs bandpass filtering.
Equipment according to a kind of rotating speed be used to obtaining wind power generating set of another exemplary embodiment of the present invention comprises: bandpass filter, the vibration data of the aerogenerator of time domain is carried out bandpass filtering; Envelope detector carries out envelope detected to the data of bandpass filtering; The frequency domain transducer will be through the data transformation of envelope detected to frequency domain; Searcher carries out the processing of search peak to the data of frequency domain, thereby obtains the teeth groove frequency of prearranged multiple; The rotating speed counter obtains the rotating speed of generator according to the teeth groove frequency that obtains with following equation, Fs=k * n, and wherein, Fs is the teeth groove frequency, and k is the quantity of the teeth groove of generator, and n is the rotating speed of generator.
Preferably, described frequency domain transducer will be through the data transformation of envelope detected to frequency domain by Fast Fourier Transform (FFT).
Preferably, by vibration transducer or by with the communicating by letter of master control system, obtain the vibration data of the aerogenerator of described time domain.
Preferably, described bandpass filter is the constant bandwidth digital band-pass filter.
Preferably, the frequency range of the extraction of described constant bandwidth digital band-pass filter is set to the frequency range of 2 frequencys multiplication of teeth groove frequency.
Preferably, the data of described envelope detector after by the Hilbert transform pairs bandpass filtering are carried out digital envelope detection.
Method according to the rotating speed that obtains genset of exemplary embodiment of the present invention can improve rotating speed and obtain precision.In addition, owing to directly extracting rotating speed from vibration data, can strict guarantee vibration data and the consistance of rotary speed data on sequential.In addition, due to the equipment without any need for special survey rotating speed, make the equipment cost of measurement of rotating speed and implementation cost be reduced to zero.
Description of drawings
By the description of embodiment being carried out below in conjunction with accompanying drawing, these and/or other aspect of the present invention and advantage will become clear and be easier to and understand, wherein:
Fig. 1 illustrates the schematic diagram according to the method for the rotating speed that obtains wind power generating set of prior art;
Fig. 2 is the process flow diagram that illustrates according to the method for the rotating speed that obtains wind power generating set of exemplary embodiment of the present invention;
Fig. 3 illustrates the spectrogram according to the method acquisition of Fig. 2.
Embodiment
Now the embodiment of the present invention is described in detail, its example shown in the accompanying drawings, wherein, identical label represents same parts all the time.Below with reference to the accompanying drawings embodiment is described to explain the present invention.
In general, a plurality of teeth groove are installed in order to placing coil on the stator of generator, so the vibration data that obtains during the genset operation has comprised the teeth groove frequency Fs of genset.Can obtain with following equation 1 rotation speed n of genset based on teeth groove frequency Fs.
[equation 1]
Fs＝k×n
Wherein, k is the quantity of the teeth groove installed on stator.
Fig. 2 is the technical scheme that illustrates according to the rotating speed that obtains wind power generating set of exemplary embodiment of the present invention.
As shown in Figure 2, in step 210, the vibration data of time domain is carried out bandpass filtering.
Here, preferably, by the constant bandwidth digital band-pass filter, the vibration data of time domain is carried out bandpass filtering.Simultaneously, be set to 2 frequencys multiplication of motor teeth groove frequency Fs the extraction calibration of digital band-pass filter.For example, if the possible range of motor teeth groove frequency Fs is 10Hz to 10000Hz, the extraction frequency range of digital band-pass filter is set to 20Hz to 20000Hz.In addition, when gathering vibration data, preferably adopt the sample frequency of 2000Hz.
In step 220, the data of bandpass filtering are carried out envelope detected.By Hilbert transform (phase shift 90 degree) technology, filtered signal is carried out digital envelope detection.
In step 230, will be through the data transformation of envelope detected to frequency domain.Preferably, the signal after envelope is carried out Fourier transform and obtain last fault signature extraction collection of illustrative plates.Here, can will be through the data transformation of envelope detected to frequency domain by Fast Fourier Transform (FFT) (FFT).For example, can obtain as shown in Figure 3 frequency domain figure.
In step 240, the data of frequency domain are carried out the processing of search peak, thereby obtain the teeth groove frequency (for example, the teeth groove frequency of 4 frequencys multiplication) of prearranged multiple.In spectrogram shown in Figure 3, in the frequency separation that can occur at the 4 frequency multiplication FS of Fs, the simple 4 frequency multiplication FS that identify generator teeth groove frequency Fs by searching for peaked way are 671.4Hz, generating unit speed n=60 * FS/ (4 * 576) corresponding to these data=17.48RPM.
In step 250, obtain the rotating speed of genset according to equation 1.As shown in Figure 3,4 frequencys multiplication of teeth groove frequency are 671.4Khz.When the quantity of teeth groove is 576, the rotation speed n=Fs/576=17.48RPM of wind power generating set.
Here, vibration data can be the vibration data that obtains by vibration transducer or the vibration data by obtaining with communicating by letter of master control system.
Method according to the rotating speed that obtains genset of exemplary embodiment of the present invention can improve rotating speed and obtain precision.In the example of describing in the above, teeth groove frequency 4 frequencys multiplication are 2304 times of rotating speed of genset, even this characteristic frequency extraction value and true value differ 10Hz, error between rotating speed calculated value and true value is (10 * 60)/(576 * 4)=0.26RPM, in the process that rotating speed calculates, error is with the convergence of 1/2304 ratio, so the measuring accuracy of rotating speed has had large increase.
The equipment of rotating speed that is used for obtaining wind power generating set according to exemplary embodiment of the present invention comprises: bandpass filter, the vibration data of the aerogenerator of time domain is carried out bandpass filtering; Envelope detector carries out envelope detected to the data of bandpass filtering; The frequency domain transducer will be through the data transformation of envelope detected to frequency domain; Searcher carries out the processing of search peak to the data of frequency domain, thereby obtains the teeth groove frequency of prearranged multiple; The rotating speed counter obtains the rotating speed of generator according to the teeth groove frequency that obtains with following equation, Fs=k * n, and wherein, Fs is the teeth groove frequency, and k is the quantity of the teeth groove of generator, and n is the rotating speed of generator.
In addition, owing to directly extracting rotating speed from vibration data, can strict guarantee vibration data and the consistance of rotary speed data on sequential.
In addition, due to the equipment without any need for special survey rotating speed, make the equipment cost of measurement of rotating speed and implementation cost be reduced to zero.
Although represented and described some embodiments of the present invention, having it should be appreciated by those skilled in the art that and to modify to these embodiment in the situation that do not break away from principle of the present invention and the spirit that is limited its scope by claim and equivalent thereof.
Claims (12)
1. the method for the rotating speed that obtains wind power generating set, comprise the steps:
Vibration data to the aerogenerator of time domain carries out bandpass filtering;
Data to bandpass filtering are carried out envelope detected;
Will be through the data transformation of envelope detected to frequency domain;
The data of frequency domain are carried out the processing of search peak, thereby obtain the teeth groove frequency of prearranged multiple;
Obtain the rotating speed of generator with following equation according to the teeth groove frequency that obtains,
Fs＝k×n，
Wherein, Fs is the teeth groove frequency, and k is the quantity of the teeth groove of generator, and n is the rotating speed of generator.
2. method according to claim 1, wherein, will be through the data transformation of envelope detected to frequency domain by Fast Fourier Transform (FFT).
3. method according to claim 1, wherein, by vibration transducer or by with the communicating by letter of master control system, obtain the vibration data of the aerogenerator of described time domain.
4. method according to claim 1, wherein, carry out bandpass filtering by the constant bandwidth digital band-pass filter to vibration data.
5. method according to claim 4, wherein, the frequency range of the extraction of described constant bandwidth digital band-pass filter is set to the frequency range of 2 frequencys multiplication of teeth groove frequency.
6. method according to claim 1, wherein, carry out digital envelope detection by the data after the Hilbert transform pairs bandpass filtering.
7. equipment that is used for obtaining the rotating speed of wind power generating set, described equipment comprises:
Bandpass filter is carried out bandpass filtering to the vibration data of the aerogenerator of time domain;
Envelope detector carries out envelope detected to the data of bandpass filtering;
The frequency domain transducer will be through the data transformation of envelope detected to frequency domain;
Searcher carries out the processing of search peak to the data of frequency domain, thereby obtains the teeth groove frequency of prearranged multiple;
The rotating speed counter obtains the rotating speed of generator according to the teeth groove frequency that obtains with following equation,
Fs＝k×n，
Wherein, Fs is the teeth groove frequency, and k is the quantity of the teeth groove of generator, and n is the rotating speed of generator.
8. equipment according to claim 7, wherein, described frequency domain transducer will be through the data transformation of envelope detected to frequency domain by Fast Fourier Transform (FFT).
9. equipment according to claim 7, wherein, by vibration transducer or by with the communicating by letter of master control system, obtain the vibration data of the aerogenerator of described time domain.
10. equipment according to claim 7, wherein, described bandpass filter is the constant bandwidth digital band-pass filter.
11. equipment according to claim 10, wherein, the frequency range of the extraction of described constant bandwidth digital band-pass filter is set to the frequency range of 2 frequencys multiplication of teeth groove frequency.
12. equipment according to claim 7, wherein, the data of described envelope detector after by the Hilbert transform pairs bandpass filtering are carried out digital envelope detection.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104865400A (en) * | 2015-04-14 | 2015-08-26 | 华北电力大学 | Method and system for detecting and identifying rotating speed of wind power generation set |
| CN106092524A (en) * | 2016-05-13 | 2016-11-09 | 长兴昇阳科技有限公司 | A kind of method using vibration signal accurately to extract tach signal |
| CN107247155A (en) * | 2017-06-22 | 2017-10-13 | 江苏方天电力技术有限公司 | A kind of rotor of turbogenerator set transient speed test device and its method of testing |
| CN104702546B (en) * | 2013-12-10 | 2018-07-20 | 上海鸣志自动控制设备有限公司 | A kind of Hilbert Real-time demodulation implementation method based on filtering |
| CN108508228A (en) * | 2017-02-24 | 2018-09-07 | 北京金风科创风电设备有限公司 | Slow-speed shaft speed measuring system and method |
| CN110108467A (en) * | 2019-05-20 | 2019-08-09 | 长沙理工大学 | Active sounding speed-measuring method based on portable mobile apparatus |
| CN113252929A (en) * | 2021-07-05 | 2021-08-13 | 格创东智(深圳)科技有限公司 | Rotating speed determination method and device, electronic equipment and computer readable storage medium |
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Cited By (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104702546B (en) * | 2013-12-10 | 2018-07-20 | 上海鸣志自动控制设备有限公司 | A kind of Hilbert Real-time demodulation implementation method based on filtering |
| CN104865400A (en) * | 2015-04-14 | 2015-08-26 | 华北电力大学 | Method and system for detecting and identifying rotating speed of wind power generation set |
| CN106092524A (en) * | 2016-05-13 | 2016-11-09 | 长兴昇阳科技有限公司 | A kind of method using vibration signal accurately to extract tach signal |
| CN106092524B (en) * | 2016-05-13 | 2018-11-13 | 长兴昇阳科技有限公司 | A method of accurately extracting tach signal using vibration signal |
| CN108508228A (en) * | 2017-02-24 | 2018-09-07 | 北京金风科创风电设备有限公司 | Slow-speed shaft speed measuring system and method |
| CN107247155A (en) * | 2017-06-22 | 2017-10-13 | 江苏方天电力技术有限公司 | A kind of rotor of turbogenerator set transient speed test device and its method of testing |
| CN110108467A (en) * | 2019-05-20 | 2019-08-09 | 长沙理工大学 | Active sounding speed-measuring method based on portable mobile apparatus |
| CN110108467B (en) * | 2019-05-20 | 2020-10-20 | 长沙理工大学 | Active sounding speed measurement method based on portable mobile equipment |
| CN113252929A (en) * | 2021-07-05 | 2021-08-13 | 格创东智(深圳)科技有限公司 | Rotating speed determination method and device, electronic equipment and computer readable storage medium |
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