CN106841949A - Three-phase asynchronous Ac motor stator insulation on-line monitoring method and device - Google Patents
Three-phase asynchronous Ac motor stator insulation on-line monitoring method and device Download PDFInfo
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- CN106841949A CN106841949A CN201710137083.2A CN201710137083A CN106841949A CN 106841949 A CN106841949 A CN 106841949A CN 201710137083 A CN201710137083 A CN 201710137083A CN 106841949 A CN106841949 A CN 106841949A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
- G01R31/1272—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation of cable, line or wire insulation, e.g. using partial discharge measurements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/346—Testing of armature or field windings
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Abstract
The invention discloses a kind of three-phase asynchronous Ac motor stator insulation on-line monitoring method, step:The voltage of synchronous acquisition motor electrical insulation system, current signal;The voltage of the motor to collecting, current signal are processed using PWM demodulation techniques;Characteristic index extraction is carried out to the signal after treatment, extraction includes MCSA characteristic indexs, current signal statistical-simulation spectrometry index, sequence voltage distribution statisticses index, Park transform characteristics index, three-phase alternating current pressure difference statistical indicator and three-phase alternating current difference statistical indicator;Each index that will be extracted carries out state and examines in advance as the training set of SVMs, and the comprehensive state of output motor insulation system examines result in advance, and the running status to motor electrical insulation system carries out online evaluation.The motor electrical insulation system on-line monitoring method that the present invention is provided, is capable of achieving the permanently effective monitoring to motor state of insulation;Multiclass dielectric features index can be merged, increased the reliability and monitoring accuracy of method, data processing precision is high.
Description
Technical field
The present invention relates to electrical equipment monitoring technical field, more particularly to a kind of three-phase asynchronous Ac motor stator insulation exists
Line monitoring method and device.
Background technology
Generally, three-phase asynchronous Ac motor is the key device in many engineering fields, is widely used at a high speed
The fields such as train, Aero-Space, electric vehicle, in the last few years, the security incident of three-phase asynchronous Ac motor takes place frequently, wherein motor
The turn-to-turn insulation failure of insulation system is to cause one of the principal element of motor accident.Therefore, it is fixed to three-phase asynchronous Ac motor
Insulating sublayer carries out on-line monitoring assessment, significant for improving motor device reliability.At present, for motor insulation event
A series of existing detection methods of barrier, existing off-line checking method such as AC impedence method, power attenuation method, differential coil probe method
Deng, and the online test method such as test of insulation current method, stator current, magnetic flux leakage, order impedance matrix, high-frequency resistance and circle
Between capacity measurement etc..
Above-mentioned motor insulation failure detection method can only assess a certain performance of insulation system, and some detection methods
Testing equipment is more complicated, heaviness, and field test is very inconvenient, convenience, measurement sensitivity and applicable situation in test etc.
There is certain deficiency in aspect, and analysis to test result is overly dependent upon expert system and professional's experience, to visitor
See, show that test result has certain limitation exactly.
The content of the invention
The present invention in the prior art can not be while assess multiple performance and the on-line monitoring technique in detection in order to overcome
The problems such as low low precision of reliability, high cost, there is provided a kind of three-phase asynchronous Ac motor stator insulation on-line monitoring method and dress
Put.
To achieve these goals, the present invention is realized by following scheme:
A kind of three-phase asynchronous Ac motor stator insulation on-line monitoring method, comprises the following steps:
The voltage of synchronous acquisition motor electrical insulation system, current signal;
The voltage of the motor to collecting, current signal are processed using PWM demodulation techniques;
Characteristic index extraction is carried out to the signal after treatment, extraction includes MCSA characteristic indexs, current signal statistical model
Distinguishing indexes, sequence voltage distribution statisticses index, Park transform characteristics index, three-phase alternating current pressure difference statistical indicator and three-phase alternating current
Difference between current statistical indicator;
Each index that will be extracted carries out state and examines in advance as the training set of SVMs, output motor insulation system
Comprehensive state examine result in advance, the running status to motor electrical insulation system carries out online evaluation.
Used as a kind of embodiment, in step 3, the extraction MCSA characteristic indexs are concretely comprised the following steps:
The current signal of motor will be collected carries out Fourier transformation and the current spectrum after being converted;
When the insulation system state of motor changes, stator winding current can produce the fundamental wave of special characteristic frequency;
By analyzing motor stator current spectrum, detection produces whether the fundamental wave component of special characteristic frequency is high-order component
The harmonic wave of frequency, determines whether motor residing running status at present.
As a kind of embodiment, in step 3, the extraction current signal statistical-simulation spectrometry index, including with
Lower step:
Current information to collecting is clustered;
The parameter of the mixed Gauss model of estimated current signal, obtains the Gaussian mixtures of current signal, by analysis
The Gaussian mixtures under Gaussian mixtures and motor free position under motor health status, show that current signal counts mould
Formula distinguishing indexes, the state of decision circuitry insulation system.
Used as a kind of embodiment, the parameter of the mixed Gauss model of the estimated current signal obtains current signal
Gaussian mixtures, by analyzing the mixed Gaussian under the Gaussian mixtures under motor health status and motor free position
Distribution, draw current signal statistical-simulation spectrometry index, and the state of decision circuitry insulation system is comprised the following steps that:
Initialize the mean μ of each Gaussian Profilek, variances sigmakAnd corresponding weight πk,
Wherein N (x/ μj,σj) it is j-th Gauss model probability density, wherein μjJ-th average of single Gaussian component is represented,
σjIt is the j covariance matrix of single Gaussian component, πjThe shared proportion in global mixed Gaussian of j-th single Gaussian component of expression,
0≤πj≤1;
Probability γ (k) of each Gauss model generation is calculated,
Average, variance and factor of influence according to each Gaussian Profile of Probability estimate, formula are as follows,
πk=Nk/N (5)
Recurrent formula (3), (4), (5), (6), average, variance and weight factor convergence until trying to achieve Gaussian Profile,
Assuming that H (x) represents the Gaussian mixtures under motor health status, G (x) represents the mixing under motor free position
Gaussian Profile, then have:
During p=1, Z represents the manhatton distance between two distributions of H (x) and G (x), and during p=2, Z is represented between two distributions
Euclidean distance,
During p=∞, Z represents the Chebyshev's distance between two distributions of H (x) and G (x),
Therefore, Z as the state characteristic quantity of circuit isolation system, can characterize the state of insulation system,
Quantify similarity degree between the two by calculating H (x) and G (x) distribution overlap index between the two.
Used as a kind of embodiment, in step 3, the extraction sequence voltage distribution statisticses index is comprised the following steps that:
Three-phase imbalance voltage or electric current can be resolved into positive-sequence component, negative sequence component and zero-sequence component in the same direction, it is public
Formula is as follows:
Wherein, V0Represent residual voltage, VPRepresent positive sequence voltage, VnNegative sequence voltage is represented, in this α=ej2π/3, j is expressed as
Imaginary unit;
Positive sequence voltage, negative sequence voltage, residual voltage are converted into forward-order current, negative-sequence current, zero-sequence current, formula is such as
Under:
Wherein, I0Represent zero-sequence current, IPRepresent forward-order current, InRepresent negative sequence voltage, zxyCorrespondence motor impedance, V0Table
Show residual voltage, VPRepresent positive sequence voltage, VnRepresent negative sequence voltage;
When motor is in health status, according to Kirchhoff's law, the sum of zero of three-phase current, zero-sequence current I0For
0, corresponding residual voltage V0It is zero, formula (9) is converted into below equation:
Vp=z11Ip+z12In (10)
Vn=z21Ip+z22In (11)
In formula (10) (11), electric current and voltage data when being run well according to motor calculate the impedance factor of motor
Matrix;
When motor state of insulation changes, then positive sequence voltage or negative sequence voltage and corresponding electric current number now is measured
According to according in formula (8), formula (9), formula (10), formula (11), drawing positive sequence voltage VPWith negative sequence voltage Vn;
When motor breaks down, the positive sequence voltage V of calculatingPWith negative sequence voltage VnWith positive sequence voltage and the negative phase-sequence electricity of measurement
Pressure can there is some difference, the positive sequence voltage V that will be calculatedPWith negative sequence voltage VnThe positive sequence voltage and negative phase-sequence obtained with measurement
The difference of the presence between voltage is used as the characteristic index for judging motor operating state.
Used as a kind of embodiment, in step 3, the extraction Park transform characteristics indexs are comprised the following steps that:
When motor state of insulation changes, stator winding current produces the fundamental wave component and electric current of fault characteristic frequency
Park's vector locus can change, according to Park convert, the positive-sequence component of fundamental wave in electric current is converted to dqo coordinates
DC component, the negative sequence component of fundamental wave is converted to the AC-frequency component 2f of dqo coordinates1, by stator current Park
Vector Mode square carries out spectrum analysis, and observation whether there is 2f1Frequency component judges whether stator winding breaks down, using friendship
Stream frequency component 2f1Amplitude size as circuit isolation system fault signature index.
As a kind of embodiment, in step 3, the extraction three-phase alternating current pressure difference statistical indicator, concrete operations
Step is as follows:
When motor state of insulation is under health status, three-phase voltage value V is measured1, appoint when motor state of insulation is in
During meaning state, the three-phase voltage value V that measurement is obtained2, by V1And V2Difference V between the two as motor electrical insulation system state
Characteristic quantity.
As a kind of embodiment, in step 3, the extraction three-phase alternating current difference statistical indicator, specific steps
It is as follows:
When motor state of insulation is under health status, three-phase electricity flow valuve I is measured1, appoint when motor state of insulation is in
During meaning state, the three-phase electricity flow valuve I that measurement is obtained2, by I1And I2Difference I between the two as motor electrical insulation system state
Characteristic quantity.
As a kind of embodiment, in step 4, training set of the state index amount that will be obtained as SVMs
The state of carrying out is examined in advance, and the running status of output motor insulation system examines result in advance, and concrete operation step is as follows:
According to the six class state characteristic indexs for obtaining, six category feature indexs are:MCSA characteristic indexs, current signal statistics mould
Formula distinguishing indexes, sequence voltage distribution statisticses index, Park transform characteristics index, three-phase alternating current pressure difference statistical indicator and three are intersected
Stream difference between current statistical indicator, sets up training dataset (ξs,ζs), ξsIt is the value of input variable, ζsIt is corresponding input variable value, S
It is training set number;
Using gaussian radial basis function:K(ξs,ζs)=exp (- | ξs-ζ|2/σ2 0), in formula, K (ξs,ζs) it is core letter
Number, σ0It is the variance of Gaussian function;
From training dataset (ξs,ζs) SVMs is trained, the state for setting up SVMs examines mould in advance
Type;
Diagnostic sample is treated with the SVMs for training carries out diagnosis output, and the state of output motor insulation system is pre-
Examine model.
A kind of three-phase asynchronous Ac motor stator insulation on-Line Monitor Device, including frequency converter, motor, data acquisition with deposit
Storage module, Data Management Analysis module, pattern-recognition judge module, control computer, controller and load;
According to the ruuning situation of load, the voltage and frequency of control computer regulation frequency converter control the defeated of the motor
Go out rotating speed and torque, the Data acquisition and storage module gathers the voltage of the controller, current signal and will collect
Voltage, current signal transfer shown and processed to the Data Management Analysis module, and feature is carried out to the signal after treatment
Index extraction, the characteristic index of extraction is transferred into the pattern-recognition judge module carries out pattern-recognition, assesses the motor
Stator insulation real-time running state;
Described Data acquisition and storage module is arranged on inside the controller, Data acquisition and storage module be used for from
The controller of motor obtains the real-time voltage signal and current signal of motor, and in sequence or numbering is stored.
The present invention has advantages below:
A kind of three-phase asynchronous Ac motor stator insulation on-Line Monitor Device, including, frequency converter, motor, data acquisition with
Memory module, Data Management Analysis module, pattern-recognition judge module, control computer, controller and load;Can subtest
The state that personnel complete motor stator insulated system is examined and fault location in advance, and display state assessment result directly perceived, operating process
It is easy to be reliable, be conducive to improving the manufacture and operation of three-phase asynchronous Ac motor stator;
The motor electrical insulation system on-line monitoring method that the present invention is provided, is capable of achieving to the permanently effective of motor state of insulation
Monitoring;Multiclass dielectric features index can be merged, so as to increased the reliability and monitoring accuracy of method, with real-time
By force, data processing precision is high, core algorithm robustness is good, state estimation accuracy high and the advantages of controllable cost, it is to avoid pass
On-line monitoring method sensor installation difficulty is high and poor real for system, and data are not preprocessed, and to be analyzed the precision for causing low
Under, and install additional great number cost that sensor causes and it is uncertain the problems such as.
It is that above and other objects of the present invention, feature and advantage can be become apparent, preferred embodiment cited below particularly,
And coordinate accompanying drawing, it is described in detail below.
Brief description of the drawings
Fig. 1 is method of the present invention schematic flow sheet;
Fig. 2 is apparatus structure schematic diagram of the invention;
Fig. 3 is the threephase asynchronous machine current signal time domain beamformer collected in the present invention;
Fig. 4 is current signal MCSA spectrograms under the threephase asynchronous machine health status in the present invention;
Fig. 5 is current signal MCSA spectrograms under the threephase asynchronous machine malfunction in the present invention;
Fig. 6 is motor in present invention positive sequence voltage distribution statisticses indicatrix under normal circumstances;
Fig. 7 is the positive sequence voltage distribution statisticses indicatrix under motor in the present invention breaks down;
Fig. 8 is the current signal Park transform characteristics indicatrixs in the present invention;
Fig. 9 is the voltage signal Park transform characteristics indicatrixs in the present invention.
Specific embodiment
Below in conjunction with accompanying drawing, the technical characteristic above-mentioned and other to the present invention and advantage are clearly and completely described,
Obviously, described embodiment is only section Example of the invention, rather than whole embodiments.
The invention provides the three-phase asynchronous Ac motor insulation system on-line monitoring method based on PHM, its flow chart is such as
Shown in Fig. 1.
S1, the voltage of synchronous acquisition motor electrical insulation system, current signal;
S2, the voltage of motor to collecting, current signal are processed using PWM demodulation techniques;
S3, characteristic index extraction is carried out to the signal after treatment, extraction includes that electric current MCSA characteristic indexs, current signal are united
Meter pattern-recognition index, sequence voltage distribution statisticses index, Park transform characteristics index, three-phase alternating current pressure difference statistical indicator and three
Cross streams difference between current statistical indicator;
S4, each index that will be extracted carry out state and examine in advance as the training set of SVMs, output motor insulation
The comprehensive state of system examines result in advance, and the running status to motor electrical insulation system carries out online evaluation.
A kind of three-phase asynchronous Ac motor stator insulation on-Line Monitor Device, such as Fig. 2 insulate for three-phase asynchronous Ac motor
The structural representation of system on-Line Monitor Device, the embodiment include frequency converter 1, motor 2, Data acquisition and storage module 3,
Data Management Analysis module 4, pattern-recognition judge module 5, control computer 6, controller 7, load 8.In device actual motion,
According to the actual conditions of load 8, the voltage and frequency of the regulation frequency converter 1 of control computer 6, and then phase asynchronous exchange can be controlled
The output speed of motor 2 and torque, meet the work requirements of actual loading.The direct acquisition control of Data acquisition and storage module 3
The voltage of device 7, current signal, and send data to Data Management Analysis module 4 and processed;Data Management Analysis module 4
Built-in PWM demodulating algorithms and feature extraction algorithm, can be demodulated and feature extraction to signal, and the characteristic index that will be handled well is passed
It is defeated to be estimated to pattern-recognition judge module 5, to judge that motor electrical insulation system whether there is turn-to-turn insulation failure;To finally comment
Estimate result to transmit to control computer 6, so as to reach the purpose of the motor stator insulated state of real-time assessment.Additionally, data acquisition
With memory module 3, the data that Data Management Analysis module 4 and pattern-recognition judge module 5 will be obtained are transmitted to control with result
Computer processed 6 is stored accordingly.
The modules in device are built, logical and test device is adjusted, by Data acquisition and storage module 3 directly from motor
Controller in obtain motor voltage signal and current signal, obtain a series of signal data.
Fig. 3 is refer to, expression is the threephase asynchronous machine current signal time domain beamformer for collecting;
How introduction in detail below extracts each characteristic index:
In S3, the extraction electric current MCSA characteristic indexs are concretely comprised the following steps:
The current signal of motor will be collected carries out Fourier transformation and the spectrogram after being converted;
When the insulation system state of motor changes, stator winding current can produce the fundamental wave of special characteristic frequency,
By analyzing motor stator current spectrum, detection produces whether the fundamental wave component of special characteristic frequency is the humorous of high-order component frequency
Ripple, determines whether motor residing running status at present.If there is fundamental wave and with the frequency phase of constant component in current signal
Mutually correspondence, then illustrate that motor have failed.
Fourier transformation treatment is done respectively to current signal under current signal under the health status that collects and malfunction,
Current signal MCSA statistical indicators are tried to achieve, as a result as shown in Figure 4,5, is understood in comparison diagram 4 and Fig. 5, the frequency of normal current signal
Frequency content is simple in spectrogram, has no high fdrequency component, and there is many places high fdrequency component in the spectrogram of fault-current signal.Therefore
Can search whether there is corresponding frequency content on spectrogram, the running status residing at present to determine motor.
In S3, the extraction current signal statistical-simulation spectrometry index is comprised the following steps:
Current information to collecting is clustered;
The parameter of the mixed Gauss model of estimated current signal, obtains the Gaussian mixtures of current signal, by analysis
The Gaussian mixtures under Gaussian mixtures and motor free position under motor health status, obtain circuit isolation system
State characteristic quantity.
In S3, the parameter of the mixed Gauss model of the estimated current signal obtains the mixed Gaussian point of current signal
Cloth, by analyzing the Gaussian mixtures under the Gaussian mixtures under motor health status and motor free position, obtains electricity
The state characteristic quantity of road insulation system is comprised the following steps that:
Initialize the mean μ of each Gaussian Profilek, variances sigmakAnd corresponding weight πk,
Wherein N (x/ μj,σj) it is j-th Gauss model probability density, wherein μjJ-th average of single Gaussian component is represented,
σjIt is the j covariance matrix of single Gaussian component, πjThe shared proportion in global mixed Gaussian of j-th single Gaussian component of expression,
0≤πj≤1;
Probability γ (k) of each Gauss model generation is calculated,
Average, variance and factor of influence according to each Gaussian Profile of Probability estimate, formula are as follows,
πk=Nk/N (5)
Recurrent formula (3), formula (4), formula (5), formula (6), calculating above-mentioned steps, until the average of Gaussian Profile,
Variance and weight factor restrain,
Assuming that H (x) represents the Gaussian mixtures under motor health status, G (x) represents the mixing under motor free position
Gaussian Profile, then have:
During p=1, Z represents the manhatton distance between two distributions of H (x) and G (x), and during p=2, Z is represented between two distributions
Euclidean distance,
During p=∞, Z represents the Chebyshev's distance between two distributions of H (x) and G (x),
Therefore, Z as the state characteristic quantity of circuit isolation system, can characterize the state of insulation system,
Quantify similarity degree between the two by calculating H (x) and G (x) distribution overlap index between the two.
In S3, the extraction sequence voltage distribution statisticses index is comprised the following steps that:
Three-phase imbalance voltage or electric current can be resolved into positive-sequence component, negative sequence component and zero-sequence component in the same direction, it is public
Formula is as follows:
Wherein, V0Represent residual voltage, VPRepresent positive sequence voltage, VnNegative sequence voltage is represented, in this α=ej2π/3, j is expressed as
Imaginary unit;
Positive sequence voltage, negative sequence voltage, residual voltage are converted into forward-order current, negative-sequence current, zero-sequence current, formula is such as
Under:
Wherein, I0Represent zero-sequence current, IPRepresent forward-order current, InRepresent negative sequence voltage, zxyCorrespondence motor impedance, V0Table
Show residual voltage, VPRepresent positive sequence voltage, VnRepresent negative sequence voltage;
When motor is in health status, according to Kirchhoff's law, the summation of three-phase current will be zero, zero-sequence current I0
It is 0, corresponding residual voltage V0Zero is all, formula (9) is converted into below equation:
Vp=z11Ip+z12In (10)
Vn=z21Ip+z22In (11)
In formula (10) (11), electric current and voltage data when being run well according to motor calculate the impedance factor of motor
Matrix;
When motor state of insulation changes, then positive sequence voltage or negative sequence voltage and corresponding electric current number now is measured
According to according in formula (8), formula (9), formula (10), formula (11), drawing positive sequence voltage VPWith negative sequence voltage Vn;
When motor breaks down, the positive sequence voltage V of calculatingPWith negative sequence voltage VnWith positive sequence voltage and the negative phase-sequence electricity of measurement
Pressure can there is some difference, the positive sequence voltage V that will be calculatedPWith negative sequence voltage VnThe positive sequence voltage and negative phase-sequence obtained with measurement
The difference of the presence between voltage is used as the characteristic index for judging motor operating state.
Electric current according to the threephase asynchronous machine for collecting calculates positive sequence voltage distribution statisticses index with voltage data, calculates
Result is as shown in Figure 6,7.Comparison diagram 6 and Fig. 7 understand, the positive sequence voltage of calculating and the positive sequence of measurement in motor under normal circumstances
Voltage value coincide substantially, only exists less gap.In the case of electrical fault, the positive sequence voltage of calculating is with measurement just
There is larger gap in sequence voltage, and failure is more serious, and gap is bigger.Therefore, can be by the positive and negative sequence voltage being calculated and survey
Distribution distance between the positive and negative sequence voltage for measuring is used as the characteristic index for judging motor operating state.
In S3, the extraction Park transform characteristics indexs are comprised the following steps that:
When motor state of insulation changes, stator winding current produces the fundamental wave component and electric current of fault characteristic frequency
Park's vector locus can change, according to Park convert, the positive-sequence component of fundamental wave in electric current is converted to dqo coordinates
DC component, the negative sequence component of fundamental wave is converted to the 2f of dqo coordinates1Component, by stator current Park Vector Modes
Spectrum analysis square is carried out, observation whether there is AC-frequency component 2f1To judge whether stator winding breaks down, using exchange frequency
Rate component 2f1Amplitude size as circuit isolation system fault signature index.Referring to Fig. 8,9, to the electricity under health status
Current signal under stream signal and malfunction carries out Park conversion, line frequency analysis of spectrum of going forward side by side, and the Park for obtaining two class signals becomes
Change characteristic index figure.As it can be observed in the picture that the current signal under health status is a circle under dqo coordinate systems, and malfunction
Track of the current signal in dqo coordinate systems can be distorted, and ellipse is turned into by circle;
As can be seen from Figure 9, when stator insulation is under health status, only direct current divides in the spectrogram after signal Park conversion
Amount, without frequency content.When stator insulation system jam, there is one in the spectrogram after signal Park conversion by negative phase-sequence
2f1The frequency content that component causes, and failure is more serious, the frequency content amplitude is bigger.Therefore can be by detecting electric current Park
Frequency component in Vector Mode judges whether motor occurs stator insulation failure.
In S3, the extraction three-phase alternating current pressure difference statistical indicator, concrete operation step is as follows:
When motor state of insulation is under health status, three-phase voltage value V is measured1, appoint when motor state of insulation is in
During meaning state, the three-phase voltage value V that measurement is obtained2, by V1And V2Difference V between the two as motor electrical insulation system state
Characteristic quantity.
In S3, the extraction three-phase alternating current difference statistical indicator is comprised the following steps that:
When motor state of insulation is under health status, three-phase electricity flow valuve I is measured1, appoint when motor state of insulation is in
During meaning state, the three-phase electricity flow valuve I that measurement is obtained2, by I1And I2Difference I between the two as motor electrical insulation system state
Characteristic quantity.
Further, the state index amount that will be obtained carries out state and examines in advance as the training set of SVMs, output electricity
The running status of machine insulation system examines result in advance, and concrete operation step is as follows:
According to the six class state characteristic index T for obtaining, training dataset (ξ is set ups,ζs), ξsIt is input variable
Value, ζsIt is corresponding input variable value, S is training set number;
Using gaussian radial basis function:K(ξs,ζs)=exp (- | ξs-ζ|2/σ2 0), in formula, K (ξs,ζs) it is kernel function,
σ0It is the variance of Gaussian function;
From a certain amount of training dataset (ξs,ζs) SVMs is trained, the state for setting up SVMs is pre-
Examine model;
Diagnostic sample is treated with the SVMs for training carries out diagnosis output, and the state of output motor insulation system is pre-
Examine model.
Although the present invention is disclosed above by preferred embodiment, but the present invention is not limited to, it is any to know this skill
Skill person, without departing from the spirit and scope of the present invention, can make a little change and retouching, therefore protection scope of the present invention is worked as
It is defined depending on claims scope required for protection.
Claims (10)
1. a kind of three-phase asynchronous Ac motor stator insulation on-line monitoring method, it is characterised in that comprise the following steps:
The voltage of synchronous acquisition motor electrical insulation system, current signal;
The voltage of the motor to collecting, current signal are processed using PWM demodulation techniques;
Characteristic index extraction is carried out to the signal after treatment, extraction includes MCSA characteristic indexs, current signal statistical-simulation spectrometry
Index, sequence voltage distribution statisticses index, Park transform characteristics index, three-phase alternating current pressure difference statistical indicator and three-phase alternating current
Difference statistical indicator;
Each index that will be extracted carries out state and examines in advance as the training set of SVMs, output motor insulation system it is comprehensive
Conjunction state examines result in advance, and the running status to motor electrical insulation system carries out online evaluation.
2. three-phase asynchronous Ac motor stator insulation on-line monitoring method according to claim 1, it is characterised in that in step
In rapid 3, the extraction MCSA characteristic indexs are concretely comprised the following steps:
The current signal of motor will be collected carries out Fourier transformation and the current spectrum after being converted;
When the insulation system state of motor changes, stator winding current can produce the fundamental wave of special characteristic frequency;
By analyzing motor stator current spectrum, detection produces whether the fundamental wave component of special characteristic frequency is high-order component frequency
Harmonic wave, determine whether motor residing running status at present.
3. three-phase asynchronous Ac motor stator insulation on-line monitoring method according to claim 1, it is characterised in that in step
In rapid 3, the extraction current signal statistical-simulation spectrometry index is comprised the following steps:
Current information to collecting is clustered;
The parameter of the mixed Gauss model of estimated current signal, obtains the Gaussian mixtures of current signal, by analyzing motor
The Gaussian mixtures under Gaussian mixtures and motor free position under health status, show that current signal statistical model is known
Other index, the state of decision circuitry insulation system.
4. three-phase asynchronous Ac motor stator insulation on-line monitoring method according to claim 3, it is characterised in that described
The parameter of the mixed Gauss model of estimated current signal, obtains the Gaussian mixtures of current signal, by analyzing motor health
The Gaussian mixtures under Gaussian mixtures and motor free position under state, show that current signal statistical-simulation spectrometry refers to
Mark, the state of decision circuitry insulation system is comprised the following steps that:
Initialize the mean μ of each Gaussian Profilek, variances sigmakAnd corresponding weight πk,
Wherein N (x/ μj,σj) it is j-th Gauss model probability density, wherein μjRepresent j-th average of single Gaussian component, σjIt is j
The covariance matrix of individual single Gaussian component, πjThe shared proportion in global mixed Gaussian of j-th single Gaussian component of expression, 0≤πj
≤1;
Probability γ (k) of each Gauss model generation is calculated,
Average, variance and factor of influence according to each Gaussian Profile of Probability estimate, formula are as follows,
πk=Nk/N (5)
Recurrent formula (3), (4), (5), (6), average, variance and weight factor convergence until trying to achieve Gaussian Profile,
Assuming that H (x) represents the Gaussian mixtures under motor health status, G (x) represents the mixed Gaussian under motor free position
Distribution, then have:
During p=1, Z represents the manhatton distance between two distributions of H (x) and G (x), and during p=2, Z represents the Europe between two distributions
Formula distance,
During p=∞, Z represents the Chebyshev's distance between two distributions of H (x) and G (x),
Therefore, Z as the state characteristic quantity of circuit isolation system, can characterize the state of insulation system,
Quantify similarity degree between the two by calculating H (x) and G (x) distribution overlap index between the two.
5. three-phase asynchronous Ac motor stator insulation on-line monitoring method according to claim 1, it is characterised in that in step
In rapid 3, the extraction sequence voltage distribution statisticses index is comprised the following steps that:
Three-phase imbalance voltage or electric current can be resolved into positive-sequence component, negative sequence component and zero-sequence component in the same direction, formula is such as
Under:
Wherein, V0Represent residual voltage, VPRepresent positive sequence voltage, VnNegative sequence voltage is represented, in this α=ej2π/3, j is expressed as imaginary number
Unit;
Positive sequence voltage, negative sequence voltage, residual voltage are converted into forward-order current, negative-sequence current, zero-sequence current, formula is as follows:
Wherein, I0Represent zero-sequence current, IPRepresent forward-order current, InRepresent negative sequence voltage, zxyCorrespondence motor impedance, V0Represent zero
Sequence voltage, VPRepresent positive sequence voltage, VnRepresent negative sequence voltage;
When motor is in health status, according to Kirchhoff's law, the sum of zero of three-phase current, zero-sequence current I0It is 0, institute
Corresponding residual voltage V0It is zero, formula (9) is converted into below equation:
Vp=z11Ip+z12In (10)
Vn=z21Ip+z22In (11)
In formula (10) (11), electric current and voltage data when being run well according to motor calculate the impedance factor square of motor
Battle array;
When motor state of insulation changes, then positive sequence voltage now or negative sequence voltage and corresponding current data are measured,
According in formula (8), formula (9), formula (10), formula (11), positive sequence voltage V is drawnPWith negative sequence voltage Vn;
When motor breaks down, the positive sequence voltage V of calculatingPWith negative sequence voltage VnPositive sequence voltage and negative sequence voltage meeting with measurement
There is some difference, the positive sequence voltage V that will be calculatedPWith negative sequence voltage VnThe positive sequence voltage and negative sequence voltage obtained with measurement
Between presence difference as the characteristic index for judging motor operating state.
6. three-phase asynchronous Ac motor stator insulation on-line monitoring method according to claim 1, it is characterised in that in step
In rapid 3, the extraction Park transform characteristics indexs are comprised the following steps that:
When motor state of insulation changes, stator winding current produces the fundamental wave component and electric current of fault characteristic frequency
Park's vector locus can be changed, and be converted according to Park, and the positive-sequence component of fundamental wave in electric current is converted into dqo coordinates
DC component, the negative sequence component of fundamental wave is converted to the AC-frequency component 2f of dqo coordinates1, sweared by stator current Park
Amount mould square carries out spectrum analysis, and observation whether there is 2f1Frequency component judges whether stator winding breaks down, using exchange
Frequency component 2f1Amplitude size as circuit isolation system fault signature index.
7. three-phase asynchronous Ac motor stator insulation on-line monitoring method according to claim 1, it is characterised in that in step
In rapid 3, the extraction three-phase alternating current pressure difference statistical indicator, concrete operation step is as follows:
When motor state of insulation is under health status, three-phase voltage value V is measured1, when motor state of insulation is in free position
When, the three-phase voltage value V that measurement is obtained2, by V1And V2Difference V between the two as motor electrical insulation system state characteristic quantity.
8. three-phase asynchronous Ac motor stator insulation on-line monitoring method according to claim 1, it is characterised in that in step
In rapid 3, the extraction three-phase alternating current difference statistical indicator is comprised the following steps that:
When motor state of insulation is under health status, three-phase electricity flow valuve I is measured1, when motor state of insulation is in free position
When, the three-phase electricity flow valuve I that measurement is obtained2, by I1And I2Difference I between the two as motor electrical insulation system state characteristic quantity.
9. three-phase asynchronous Ac motor stator insulation on-line monitoring method according to claim 1, it is characterised in that in step
In rapid 4, the state index amount that will be obtained carries out state and examines in advance as the training set of SVMs, output motor insulation system
Running status examines result in advance, and concrete operation step is as follows:
According to the six class state characteristic indexs for obtaining, six category feature indexs are:MCSA characteristic indexs, current signal statistical model are known
Other index, sequence voltage distribution statisticses index, Park transform characteristics index, three-phase alternating current pressure difference statistical indicator and three-phase alternating current
Stream difference statistical indicator, sets up training dataset (ξs,ζs), ξsIt is the value of input variable, ζsIt is corresponding input variable value, S is instruction
Practice collection number;
Using gaussian radial basis function:K(ξs,ζs)=exp (- | ξs-ζ|2/σ2 0), in formula, K (ξs,ζs) it is kernel function, σ0
It is the variance of Gaussian function;
From training dataset (ξs,ζs) SVMs is trained, the state for setting up SVMs examines model in advance;
Diagnostic sample is treated with the SVMs for training carries out diagnosis output, and the state of output motor insulation system examines mould in advance
Type.
10. a kind of three-phase asynchronous Ac motor stator insulation on-Line Monitor Device, it is characterised in that including frequency converter, motor, number
According to collection and memory module, Data Management Analysis module, pattern-recognition judge module, control computer, controller and load;
According to the ruuning situation of load, the voltage and frequency of control computer regulation frequency converter control the output of the motor to turn
Speed and torque, the Data acquisition and storage module gather the voltage of the controller, current signal and the voltage that will be collected,
Current signal transfer shown and processed to the Data Management Analysis module, and carrying out characteristic index to the signal after treatment carries
Take, the characteristic index of extraction is transferred into the pattern-recognition judge module carries out pattern-recognition, assesses the motor stator exhausted
Edge real-time running state;
Described Data acquisition and storage module is arranged on inside the controller, and Data acquisition and storage module is used for from motor
Controller obtain motor real-time voltage signal and current signal, and in sequence or numbering stored.
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