CN103869248B - Determine the method causing double-fed wind power generator imbalance of three-phase voltage stator phase - Google Patents
Determine the method causing double-fed wind power generator imbalance of three-phase voltage stator phase Download PDFInfo
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Abstract
Determine the method causing double-fed wind power generator imbalance of three-phase voltage stator phase, by to the vibration signal collected from double-fed wind power generator and voltage, the analysis of current signal, above-mentioned analysis result is carried out cause double-fed wind power generator imbalance of three-phase voltage stator phase in conjunction with diagnosis, utilize the phasing degree of extracting from vibration signal, from the fault stator phase that voltage signal is determined, extract three alternate current and phase differences from current signal and depart from 120 ° of values, threephase stator current effective value determines the stator phase causing three-phase imbalance, and introduce vibration factor, voltage factor, current factor, each corresponding above-mentioned factor values is added, obtain three probable values that threephase stator causes generator three-phase imbalance, then above-mentioned three probable values are sorted, thus determine the priority ranking causing generator three-phase imbalance three stator phase, determine according to this order and cause the crucial stator phase of generator three-phase imbalance, vibration signal, voltage signal, current signal analysis result combine by the present invention, reduce the fault analysis error only utilizing a certain signal to cause.
Description
Technical field
The present invention relates to double-fed wind power generator technical field, be specifically related to the method determining to cause double-fed wind power generator imbalance of three-phase voltage stator phase.
Background technology
The method of diagnosis generator threephase stator Voltage unbalance conventional at present mainly contains two kinds: a kind of for be diagnosed by voltage signal, the method is the most direct method, threephase stator voltage is gathered by parallel way, its effective value is compared, if the voltage effective value that certain phase stator is corresponding is comparatively large with the voltage effective value difference that other two-phase stator is corresponding, just can think that this phase stator causes the imbalance of three-phase voltage of generator of knowing clearly.Second method is: electric current negative sequence component method, the method gathers generator three-phase current signal by current sensor, to and the negative sequence component of three-phase current signal, by comparing the negative sequence component corresponding to three-phase current signal, find out negative sequence component that wherein a phase current is corresponding with the larger phase of other two corresponding negative sequence component differences, thus determine that this phase stator causes the imbalance of three-phase voltage of generator.
Have at present much by the way of the vibratory output of vibration transducer monitoring generator, but seldom cause generator three-phase imbalance stator phase with the method diagnosis.
Both at home and abroad to the voltage of generator containing high fdrequency component, monitoring and the signal analysis of the electric signal such as electric current and power are also in conceptual phase, for generator imbalance of three-phase voltage fault, most research is only confined in single electric signal, for the single electric signal (electric current of employing, voltage signal) diagnose the method for generator imbalance of three-phase voltage fault, due to electromagnetic interference (EMI), the impact of the factors such as measuring error, measuring accuracy can be made to reduce, for slight generator imbalance of three-phase voltage fault, be difficult to from electric signal, extract effective characteristic information identify fault.
In addition, the method causing double-fed generator imbalance of three-phase voltage stator phase is determined for current existing detection three-phase voltage, when there is uneven or load imbalance in line voltage, the difference recording generator threephase stator magnitude of voltage can be caused equally, namely cannot judge whether double-fed generator imbalance of three-phase voltage is caused by generator unit stator fault in this case.
The method of generator three-phase imbalance stator phase is caused by the diagnosis of electric current negative sequence component method, the principle of work of current sensor conventional is at present inductance principle, due to the impact of the factor such as electromagnetic interference (EMI), measuring error, measuring accuracy can be made to reduce, especially for double feed wind power generator, because switch board, current transformer etc. are very near with the distance between generator, current sensor can be larger by the impact of electromagnetic interference (EMI), therefore for stator incipient failure, be difficult to be judged by current signal.
The vibration of generator can be caused during generator imbalance of three-phase voltage, by monitoring the vibration of generator, by vibration signal and electric signal (electric current, voltage signal) combine and diagnose aerogenerator imbalance of three-phase voltage fault can overcome above-mentioned shortcoming, the ability of vibration transducer opposing electromagnetic interference (EMI) is better than current sensor, but the measuring accuracy of vibration transducer is usually high less than current sensor, based on such background, this patent gives vibration signal, electric current, the voltage signal diagnosis that combines causes the method for generator three-phase imbalance stator phase, namely the method make use of the advantage of various method, take into full account again respective shortcoming.
Summary of the invention
In order to solve the problem, the object of the present invention is to provide a kind of method determining to cause double-fed wind power generator imbalance of three-phase voltage stator phase, vibration signal, voltage signal, current signal analysis result are considered, better can determine fault stator phase, reduce the fault analysis error only utilizing a certain signal to cause.
For reaching above object, the present invention adopts following technical scheme:
Determine the method causing double-fed wind power generator imbalance of three-phase voltage stator phase, by vibration signal and voltage, current signal are caused double-fed wind power generator imbalance of three-phase voltage stator phase in conjunction with diagnosis, concrete grammar is as follows:
Utilize vibration signal to diagnose and cause double-fed wind power generator imbalance of three-phase voltage phase time, first FFT conversion is done to the vibration signal collected, try to achieve the phasing degree that maximum vibration amplitude place is corresponding relative to 0 phase place, and in conjunction with after the situation of change of vibration amplitude and FFT conversion whether a frequency multiplication to be dominant these two factors, determine the stator phase causing double-fed wind power generator imbalance of three-phase voltage, when vibration signal amplitude changes, and vibration signal frequency multiplication after FFT conversion is dominant, the phasing degree of its vibration signal is close to the angle of certain phase stator relative to 0 degree of angle, or both differ 180 °, then think that this is the crucial stator phase causing double-fed wind power generator imbalance of three-phase voltage mutually, the vibration factor of this this phase seasonal equals 1/3, all the other two corresponding vibration factor equal 0, otherwise then make the vibration factor of three-phase all equal 0,
Utilize voltage signal to diagnose and cause double-fed wind power generator imbalance of three-phase voltage phase time, three-phase voltage value is recorded by comparing, if the voltage effective value difference that the voltage effective value that certain phase stator is corresponding is corresponding with other two-phase stator is larger, then think that this is the crucial stator phase causing double-fed wind power generator imbalance of three-phase voltage mutually, the voltage factor of this this phase seasonal equals 1/3, and the voltage factor of all the other two-phases equals 0; If the three-phase voltage value recorded is equal or its measured value difference allow error range in, then make the voltage factor of three-phase be equal to 0;
Utilize current signal to diagnose and cause double-fed wind power generator imbalance of three-phase voltage phase time, first calculate stator AB, BC, CA three-phase current phase differential and depart from the value of 120 ° and each phase current effective value, the difference of 120 ° is departed from by comparing AB, BC, CA three-phase current phase differential, determine that in three-phase, phase differential departs from the maximum two-phase of the value of 120 °, then think that this two-phase is the crucial stator phase causing double-fed wind power generator imbalance of three-phase voltage, make the current factor-1 of this two-phase equal 1/6, the current factor-1 of an other phase equals 0; If AB, BC, CA three-phase current phase differential is equal with the value of 120 °, then the current factor-1 of three-phase is made to be equal to 0; For the effective value of three-phase current, if three-phase current effective value is equal, then the current factor-2 making three-phase current corresponding is equal to 0; Otherwise, if have in three-phase current the effective value of certain phase apparently higher than or lower than other two-phase, then think that this is the crucial stator phase causing double-fed wind power generator imbalance of three-phase voltage mutually, the current factor-2 making this corresponding equals 1/6, and the current factor-2 of all the other two-phases equals 0;
After the vibration factor that threephase stator is corresponding, voltage factor, current factor-1, current factor-2 value are determined, each corresponding above-mentioned factor values is added, obtain three probable values that threephase stator causes double-fed wind power generator three-phase imbalance, then above-mentioned three probable values are sorted, thus determine the priority ranking causing generator three-phase imbalance three stator phase, determine according to this order and cause the crucial stator phase of generator three-phase imbalance.
Compared to the prior art, tool has the following advantages in the present invention:
1) vibration signal, voltage signal, current signal analysis result are considered, utilize the phasing degree of extracting from vibration signal, the fault stator phase determined from voltage signal, depart from 120 ° of values from the alternate current and phase difference of current signal three, stator phase that threephase stator effective value determines to cause three-phase imbalance.
2) vibration factor, voltage factor, current factor is introduced, the stator phase weight causing double-fed wind power generator three-phase imbalance can better be determined, the priority of the stator phase causing generator three-phase imbalance can be determined, utilize this order to check generator unit stator, can increase work efficiency and diagnostic accuracy.
3) utilize threephase stator to cause three probable values of generator three-phase imbalance, can easier cause the weight of generator three-phase imbalance to carry out quantitative analysis to certain phase stator.
4) determine from probability angle the stator phase causing generator three-phase imbalance, better can determine fault stator phase.
5) the fault analysis error only utilizing a certain signal to cause is reduced
In a word, vibration signal, voltage signal, current signal analysis result, by introducing vibration factor, voltage factor, current factor-1, current factor-2, combine, namely overcome respective shortcoming, make use of again respective advantage by the present invention.
Accompanying drawing explanation
Accompanying drawing is the inventive method process flow diagram.
Embodiment
Below in conjunction with drawings and the specific embodiments, the present invention is described in further detail.
When double-fed generator produces imbalance of three-phase voltage, electric rotating machine can be caused to run under asymmetrical state, in addition the reversed magnetic field that formed of three characteristics of the middle term imbalance and the additional moment that produces can make motor occur vibration.When the phase in three-phase voltage is different with other two-phase, generator amature will be subject to the effect of an out-of-balance force in operational process, the impact of this acting force on rotor is similar to the impact of mass unbalance on rotor, and the phase place of consequent vibration is with causing the identical or difference 180 ° of the phase place of generator imbalance of three-phase voltage phase.
As shown in drawings, the present invention determines the method causing double-fed wind power generator imbalance of three-phase voltage stator phase, cause double-fed wind power generator imbalance of three-phase voltage stator phase by the diagnosis that vibration signal and voltage, current signal combined, concrete grammar is as follows:
Utilize vibration signal to diagnose and cause double-fed wind power generator imbalance of three-phase voltage phase time, first FFT conversion is done to the vibration signal collected, try to achieve the phasing degree that maximum vibration amplitude place is corresponding relative to 0 phase place, and in conjunction with after the situation of change of vibration amplitude and FFT conversion whether a frequency multiplication to be dominant these two factors, determine the stator phase causing double-fed wind power generator imbalance of three-phase voltage, when vibration signal amplitude changes, and vibration signal frequency multiplication after FFT conversion is dominant, the phasing degree of its vibration signal is close to the angle of certain phase stator relative to 0 degree of angle, or both differ 180 °, then think that this is the crucial stator phase causing double-fed wind power generator imbalance of three-phase voltage mutually, the vibration factor of this this phase seasonal equals 1/3, all the other two corresponding vibration factor equal 0, otherwise then make the vibration factor of three-phase all equal 0,
Utilize voltage signal to diagnose and cause double-fed wind power generator imbalance of three-phase voltage phase time, three-phase voltage value is recorded by comparing, if the voltage effective value difference that the voltage effective value that certain phase stator is corresponding is corresponding with other two-phase stator is larger, then think that this is the crucial stator phase causing double-fed wind power generator imbalance of three-phase voltage mutually, the voltage factor of this this phase seasonal equals 1/3, and the voltage factor of all the other two-phases equals 0; If the three-phase voltage value recorded is equal or its measured value difference allow error range in, then make the voltage factor of three-phase be equal to 0;
Utilize current signal to diagnose and cause double-fed wind power generator imbalance of three-phase voltage phase time, first calculate stator AB, BC, CA three-phase current phase differential and depart from the value of 120 ° and each phase current effective value, the difference of 120 ° is departed from by comparing AB, BC, CA three-phase current phase differential, determine that in three-phase, phase differential departs from the maximum two-phase of the value of 120 °, then think that this two-phase is the crucial stator phase causing double-fed wind power generator imbalance of three-phase voltage, make the current factor-1 of this two-phase equal 1/6, the current factor-1 of an other phase equals 0; If AB, BC, CA three-phase current phase differential is equal with the value of 120 °, then the current factor-1 of three-phase is made to be equal to 0; For the effective value of three-phase current, if three-phase current effective value is equal, then the current factor-2 making three-phase current corresponding is equal to 0; Otherwise, if have in three-phase current the effective value of certain phase apparently higher than or lower than other two-phase, then think that this is the crucial stator phase causing double-fed wind power generator imbalance of three-phase voltage mutually, the current factor-2 making this corresponding equals 1/6, and the current factor-2 of all the other two-phases equals 0;
After the vibration factor that threephase stator is corresponding, voltage factor, current factor-1, current factor-2 value are determined, each corresponding above-mentioned factor values is added, obtain three probable values that threephase stator causes double-fed wind power generator three-phase imbalance, then above-mentioned three probable values are sorted, thus determine the priority ranking causing generator three-phase imbalance three stator phase, determine according to this order and cause the crucial stator phase of generator three-phase imbalance.
Claims (1)
1. determine the method causing double-fed wind power generator imbalance of three-phase voltage stator phase, it is characterized in that: by vibration signal and voltage, current signal are caused double-fed wind power generator imbalance of three-phase voltage stator phase in conjunction with diagnosis, concrete grammar is as follows:
Utilize vibration signal to diagnose and cause double-fed wind power generator imbalance of three-phase voltage phase time, first FFT conversion is done to the vibration signal collected, try to achieve the phasing degree that maximum vibration amplitude place is corresponding relative to 0 phase place, and in conjunction with after the situation of change of vibration amplitude and FFT conversion whether a frequency multiplication to be dominant these two factors, determine the stator phase causing double-fed wind power generator imbalance of three-phase voltage, when vibration signal amplitude changes, and vibration signal frequency multiplication after FFT conversion is dominant, the phasing degree of its vibration signal is close to the angle of certain phase stator relative to 0 degree of angle, or both differ 180 °, then think that this is the crucial stator phase causing double-fed wind power generator imbalance of three-phase voltage mutually, the vibration factor of this this phase seasonal equals 1/3, all the other two corresponding vibration factor equal 0, otherwise then make the vibration factor of three-phase all equal 0,
Utilize voltage signal to diagnose and cause double-fed wind power generator imbalance of three-phase voltage phase time, by comparing the three-phase voltage value recorded, if the voltage effective value difference that the voltage effective value that certain phase stator is corresponding is corresponding with other two-phase stator is larger, then think that this is the crucial stator phase causing double-fed wind power generator imbalance of three-phase voltage mutually, the voltage factor of this this phase seasonal equals 1/3, and the voltage factor of all the other two-phases equals 0; If the three-phase voltage value recorded is equal or its measured value difference allow error range in, then make the voltage factor of three-phase be equal to 0;
Utilize current signal to diagnose and cause double-fed wind power generator imbalance of three-phase voltage phase time, first calculate stator AB, BC, CA three-phase current phase differential and depart from the value of 120 ° and each phase current effective value, the difference of 120 ° is departed from by comparing AB, BC, CA three-phase current phase differential, determine that in three-phase, phase differential departs from the maximum two-phase of the value of 120 °, then think that this two-phase is the crucial stator phase causing double-fed wind power generator imbalance of three-phase voltage, make the current factor-1 of this two-phase equal 1/6, the current factor-1 of an other phase equals 0; If AB, BC, CA three-phase current phase differential is equal with the value of 120 °, then the current factor-1 of three-phase is made to be equal to 0; For the effective value of three-phase current, if three-phase current effective value is equal, then the current factor-2 making three-phase current corresponding is equal to 0; Otherwise, if have in three-phase current the effective value of certain phase apparently higher than or lower than other two-phase, then think that this is the crucial stator phase causing double-fed wind power generator imbalance of three-phase voltage mutually, the current factor-2 making this corresponding equals 1/6, and the current factor-2 of all the other two-phases equals 0;
After the vibration factor that threephase stator is corresponding, voltage factor, current factor-1, current factor-2 value are determined, each corresponding above-mentioned factor values is added, obtain three probable values that threephase stator causes double-fed wind power generator three-phase imbalance, then above-mentioned three probable values are sorted, thus determine the priority ranking causing generator three-phase imbalance three stator phase, determine according to this order and cause the crucial stator phase of generator three-phase imbalance.
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| CN108196187B (en) * | 2018-01-11 | 2020-08-25 | 河海大学 | Method for diagnosing three-phase asymmetric load fault of rotor winding of doubly-fed wind generator |
| CN108548954A (en) * | 2018-05-29 | 2018-09-18 | 佛山市旅行青蛙科技有限公司 | A kind of equipment of the situation of monitoring AC electrical device |
| CN109297716B (en) * | 2018-10-23 | 2020-03-31 | 西安热工研究院有限公司 | Vibration fault diagnosis method for double-fed wind driven generator |
| CN111665441B (en) * | 2020-06-16 | 2023-07-14 | 北京润科通用技术有限公司 | Motor fault diagnosis method and device |
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