CN103869248A - Method for determining stator phase causing three-phase voltage unbalance of doubly-fed wind generator - Google Patents
Method for determining stator phase causing three-phase voltage unbalance of doubly-fed wind generator Download PDFInfo
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Abstract
The invention discloses a method for determining a stator phase causing three-phase voltage unbalance of a doubly-fed wind generator. Vibration signals, voltage signals and current signals which are collected from the doubly-fed wind generator are analyzed, the analysis results are combined to diagnose the stator phase causing three-phase voltage unbalance of the doubly-fed wind generator, and the stator phase causing three-phase unbalance is determined by using the phase angle extracted from the vibration signals, the fault stator phase determined from the voltage signals, and the 120-degree deviation value of current and phase difference among three phases and the three-phase stator current effective value extracted from the current signals. Vibration factors, voltage factors and current factors are introduced, the factor values corresponding to all the phases are added, three probability values of a three-phase stator causing three-phase unbalance of the generator are obtained, then, the three probability values are ranked, so that the priority of the three stator phases causing three-phase unbalance of the generator is determined, and a key stator phase causing three-phase unbalance of the generator is determined according to the priority. According to the method, the analysis result of the vibration signals, the analysis result of the voltage signals and the analysis result of the current signals are combined, and therefore fault analysis errors caused by a certain signal merely are reduced.
Description
Technical field
The present invention relates to double-fed wind power generator technical field, be specifically related to determine the method that causes double-fed wind power generator imbalance of three-phase voltage stator phase.
Background technology
The method of at present conventional diagnosis generator threephase stator Voltage unbalance mainly contains two kinds: a kind of for to diagnose by voltage signal, the method is the most direct method, gather threephase stator voltage by parallel way, its effective value is compared, if the voltage effective value that certain phase stator is corresponding differs larger with voltage effective value corresponding to other two-phase stator, just can think that this phase stator causes the imbalance of three-phase voltage of the 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 corresponding negative sequence component of three-phase current signal, find out negative sequence component that wherein a phase current is corresponding and differ larger phase with other two corresponding negative sequence components, thereby determine this phase stator and caused the imbalance of three-phase voltage of generator.
There is at present the way of much monitoring the vibratory output of generator by vibration transducer, but seldom cause generator three-phase imbalance stator phase with the method diagnosis.
The voltage containing high fdrequency component to generator both at home and abroad, the monitoring of the electric signal such as electric current and power and signal analysis are also in conceptual phase, for generator imbalance of three-phase voltage fault, most research is only confined in single electric signal, for adopting single electric signal (electric current, voltage signal) method of diagnosis generator imbalance of three-phase voltage fault, due to electromagnetic interference (EMI), the impact of the factors such as measuring error, can make measuring accuracy reduce, for slight generator imbalance of three-phase voltage fault, being difficult to from electric signal, to extract effective characteristic information identifies fault.
In addition, determine the method that causes double-fed generator imbalance of three-phase voltage stator phase for current existing detection three-phase voltage, in the time there is imbalance or load imbalance in line voltage, can cause equally the difference that records generator threephase stator magnitude of voltage, cannot judge in this case whether double-fed generator imbalance of three-phase voltage is caused by generator unit stator fault.
Cause the method for generator three-phase imbalance stator phase by the diagnosis of electric current negative sequence component method, the principle of work of at present conventional current sensor is inductance principle, due to the impact of the factor such as electromagnetic interference (EMI), measuring error, can make measuring accuracy reduce, especially for double feed wind power generator, because of switch board, current transformer etc. very near with the distance between generator, current sensor be subject to electromagnetic interference (EMI) to affect meeting larger, therefore for stator incipient failure, be difficult to judge by current signal.
When generator imbalance of three-phase voltage, can cause the vibration of generator, by the vibration of monitoring 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 conventionally high less than current sensor, based on such background, this patent has provided vibration signal, electric current, voltage signal combines and diagnoses the method that causes generator three-phase imbalance stator phase, the method has utilized the advantage of the whole bag of tricks, take into full account again shortcoming separately.
Summary of the invention
In order to address the above problem, the object of the present invention is to provide a kind of method that causes double-fed wind power generator imbalance of three-phase voltage stator phase of determining, vibration signal, voltage signal, current signal analysis result are considered, can better determine fault stator phase, reduce the fault analysis error of only utilizing a certain signal to cause.
For reaching above object, the present invention adopts following technical scheme:
Determine the method that causes double-fed wind power generator imbalance of three-phase voltage stator phase, by vibration signal and voltage, current signal are caused to double-fed wind power generator imbalance of three-phase voltage stator phase in conjunction with diagnosis, concrete grammar is as follows:
Utilize vibration signal diagnosis to cause double-fed wind power generator imbalance of three-phase voltage phase time, first the vibration signal collecting is done to FFT conversion, try to achieve the phasing degree corresponding with respect to 0 phase place, maximum vibration amplitude place, and in conjunction with a frequency multiplication this two factors that are dominant whether after the situation of change of vibration amplitude and FFT conversion, determine the stator phase that causes 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 the angle with respect to 0 degree angle close to certain phase stator, or both differ 180 °, think that this is the crucial stator phase that causes double-fed wind power generator imbalance of three-phase voltage mutually, the vibration factor of this seasonal this phase equals 1/3, all the other two corresponding vibration factor equal 0, otherwise make the vibration factor of three-phase all equal 0,
Utilize voltage signal diagnosis to cause double-fed wind power generator imbalance of three-phase voltage phase time, by relatively recording three-phase voltage value, if voltage effective value and voltage effective value corresponding to other two-phase stator that certain phase stator is corresponding differ larger, think that this is the crucial stator phase that causes double-fed wind power generator imbalance of three-phase voltage mutually, the voltage factor of this seasonal this phase equals 1/3, and the voltage factor of all the other two-phases equals 0; If the three-phase voltage value recording equate or its measured value difference allow error range in, make the voltage factor of three-phase be equal to 0;
Utilize current signal diagnosis to cause double-fed wind power generator imbalance of three-phase voltage phase time, first calculate stator AB, BC, CA three-phase current phase differential departs from value and each phase current effective value of 120 °, by relatively AB, BC, CA three-phase current phase differential depart from the difference of 120 °, determine that phase differential in three-phase departs from the maximum two-phase of the value of 120 °, think that this two-phase is the crucial stator phase that causes double-fed wind power generator imbalance of three-phase voltage, make current factor-1 of this two-phase equal 1/6, current factor-1 of an other phase equals 0; If AB, BC, CA three-phase current phase differential equate with the value of 120 °, make current factor-1 of three-phase be equal to 0; For the effective value of three-phase current, if three-phase current effective value is equal, make current factor-2 that three-phase current is corresponding be equal to 0; Otherwise, if the effective value that has certain phase in three-phase current apparently higher than or lower than other two-phase, think that this is the crucial stator phase that causes double-fed wind power generator imbalance of three-phase voltage mutually, make these corresponding current factor-2 equal 1/6, current factor-2 of all the other two-phases equal 0;
After vibration factor, the voltage factor, current factor-1, current factor-2 value that threephase stator is corresponding 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, thereby determine the priority ranking that causes generator three-phase imbalance three stator phases, determine and cause the crucial stator phase of generator three-phase imbalance according to this order.
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, from the definite fault stator phase of voltage signal, depart from the definite stator phase that causes three-phase imbalance of 120 ° of values, threephase stator effective value from the alternate current and phase difference of current signal three.
2) introduce vibration factor, the voltage factor, current factor, can better determine the stator phase weight that causes double-fed wind power generator three-phase imbalance, can determine the priority of the stator phase that causes generator three-phase imbalance, 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 be easier certain phase stator be caused to the weight of generator three-phase imbalance carries out quantitative analysis.
4) determine from probability angle the stator phase that causes generator three-phase imbalance, can better determine fault stator phase.
5) reduced the fault analysis error of only utilizing a certain signal to cause
In a word, the present invention, by introducing vibration factor, the voltage factor, current factor-1, current factor-2, combines vibration signal, voltage signal, current signal analysis result, has overcome shortcoming separately, has utilized again advantage separately.
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 when imbalance of three-phase voltage, can cause electric rotating machine to move under asymmetrical state, in addition the uneven reversed magnetic field forming of the three characteristics of the middle term and the additional moment that produces can make motor occur vibration.In the time that one in three-phase voltage is different with other two-phase mutually, generator amature will be subject to the effect of an out-of-balance force in operational process, this acting force is similar to the impact of mass unbalance on rotor to the impact of rotor, and the phase place of consequent vibration is with causing that the phase place of generator imbalance of three-phase voltage phase is identical or differ 180 °.
As shown in drawings, the present invention determines the method that causes 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 diagnosis that vibration signal and voltage, current signal are combined, concrete grammar is as follows:
Utilize vibration signal diagnosis to cause double-fed wind power generator imbalance of three-phase voltage phase time, first the vibration signal collecting is done to FFT conversion, try to achieve the phasing degree corresponding with respect to 0 phase place, maximum vibration amplitude place, and in conjunction with a frequency multiplication this two factors that are dominant whether after the situation of change of vibration amplitude and FFT conversion, determine the stator phase that causes 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 the angle with respect to 0 degree angle close to certain phase stator, or both differ 180 °, think that this is the crucial stator phase that causes double-fed wind power generator imbalance of three-phase voltage mutually, the vibration factor of this seasonal this phase equals 1/3, all the other two corresponding vibration factor equal 0, otherwise make the vibration factor of three-phase all equal 0,
Utilize voltage signal diagnosis to cause double-fed wind power generator imbalance of three-phase voltage phase time, by relatively recording three-phase voltage value, if voltage effective value and voltage effective value corresponding to other two-phase stator that certain phase stator is corresponding differ larger, think that this is the crucial stator phase that causes double-fed wind power generator imbalance of three-phase voltage mutually, the voltage factor of this seasonal this phase equals 1/3, and the voltage factor of all the other two-phases equals 0; If the three-phase voltage value recording equate or its measured value difference allow error range in, make the voltage factor of three-phase be equal to 0;
Utilize current signal diagnosis to cause double-fed wind power generator imbalance of three-phase voltage phase time, first calculate stator AB, BC, CA three-phase current phase differential departs from value and each phase current effective value of 120 °, by relatively AB, BC, CA three-phase current phase differential depart from the difference of 120 °, determine that phase differential in three-phase departs from the maximum two-phase of the value of 120 °, think that this two-phase is the crucial stator phase that causes double-fed wind power generator imbalance of three-phase voltage, make current factor-1 of this two-phase equal 1/6, current factor-1 of an other phase equals 0; If AB, BC, CA three-phase current phase differential equate with the value of 120 °, make current factor-1 of three-phase be equal to 0; For the effective value of three-phase current, if three-phase current effective value is equal, make current factor-2 that three-phase current is corresponding be equal to 0; Otherwise, if the effective value that has certain phase in three-phase current apparently higher than or lower than other two-phase, think that this is the crucial stator phase that causes double-fed wind power generator imbalance of three-phase voltage mutually, make these corresponding current factor-2 equal 1/6, current factor-2 of all the other two-phases equal 0;
After vibration factor, the voltage factor, current factor-1, current factor-2 value that threephase stator is corresponding 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, thereby determine the priority ranking that causes generator three-phase imbalance three stator phases, determine and cause the crucial stator phase of generator three-phase imbalance according to this order.
Claims (1)
1. determine the method that causes 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 to double-fed wind power generator imbalance of three-phase voltage stator phase in conjunction with diagnosis, concrete grammar is as follows:
Utilize vibration signal diagnosis to cause double-fed wind power generator imbalance of three-phase voltage phase time, first the vibration signal collecting is done to FFT conversion, try to achieve the phasing degree corresponding with respect to 0 phase place, maximum vibration amplitude place, and in conjunction with a frequency multiplication this two factors that are dominant whether after the situation of change of vibration amplitude and FFT conversion, determine the stator phase that causes 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 the angle with respect to 0 degree angle close to certain phase stator, or both differ 180 °, think that this is the crucial stator phase that causes double-fed wind power generator imbalance of three-phase voltage mutually, the vibration factor of this seasonal this phase equals 1/3, all the other two corresponding vibration factor equal 0, otherwise make the vibration factor of three-phase all equal 0,
Utilize voltage signal diagnosis to cause double-fed wind power generator imbalance of three-phase voltage phase time, by relatively recording three-phase voltage value, if voltage effective value and voltage effective value corresponding to other two-phase stator that certain phase stator is corresponding differ larger, think that this is the crucial stator phase that causes double-fed wind power generator imbalance of three-phase voltage mutually, the voltage factor of this seasonal this phase equals 1/3, and the voltage factor of all the other two-phases equals 0; If the three-phase voltage value recording equate or its measured value difference allow error range in, make the voltage factor of three-phase be equal to 0;
Utilize current signal diagnosis to cause double-fed wind power generator imbalance of three-phase voltage phase time, first calculate stator AB, BC, CA three-phase current phase differential departs from value and each phase current effective value of 120 °, by relatively AB, BC, CA three-phase current phase differential depart from the difference of 120 °, determine that phase differential in three-phase departs from the maximum two-phase of the value of 120 °, think that this two-phase is the crucial stator phase that causes double-fed wind power generator imbalance of three-phase voltage, make current factor-1 of this two-phase equal 1/6, current factor-1 of an other phase equals 0; If AB, BC, CA three-phase current phase differential equate with the value of 120 °, make current factor-1 of three-phase be equal to 0; For the effective value of three-phase current, if three-phase current effective value is equal, make current factor-2 that three-phase current is corresponding be equal to 0; Otherwise, if the effective value that has certain phase in three-phase current apparently higher than or lower than other two-phase, think that this is the crucial stator phase that causes double-fed wind power generator imbalance of three-phase voltage mutually, make these corresponding current factor-2 equal 1/6, current factor-2 of all the other two-phases equal 0;
After vibration factor, the voltage factor, current factor-1, current factor-2 value that threephase stator is corresponding 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, thereby determine the priority ranking that causes generator three-phase imbalance three stator phases, determine and cause the crucial stator phase of generator three-phase imbalance according to this order.
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| CN108196187A (en) * | 2018-01-11 | 2018-06-22 | 河海大学 | Double-fed wind power generator rotor winding three-phase asymmetric load method for diagnosing faults |
| 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 |
| CN109297716A (en) * | 2018-10-23 | 2019-02-01 | 西安热工研究院有限公司 | Vibration fault diagnosis method for double-fed wind driven generator |
| CN111665441A (en) * | 2020-06-16 | 2020-09-15 | 北京润科通用技术有限公司 | Motor fault diagnosis method and device |
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| CN111665441A (en) * | 2020-06-16 | 2020-09-15 | 北京润科通用技术有限公司 | Motor fault diagnosis method and device |
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