CN109991539A - Multiphase corner connection brushless exciter rotating diode one-phase open circuit detection method and system - Google Patents
Multiphase corner connection brushless exciter rotating diode one-phase open circuit detection method and system Download PDFInfo
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Abstract
This application involves a kind of multiphase corner connection brushless exciter rotating diode one-phase open circuit detection method and systems.After the exciting current for obtaining the stator excitation winding for entering exciter, filter out the DC component and number of phases harmonic in exciting current, obtain the electric current containing odd-times and even harmonics simultaneously, then the electric current simultaneously containing odd-times and even harmonics is divided into two-way, obtain the first electric current and the second electric current, the first delay exciting current will be obtained after second current slow fiducial time, subtract each other the first electric current and the first delay exciting current to obtain the electric current containing odd harmonics, the detection of rotating diode one-phase open circuit is carried out according to the electric current simultaneously containing odd-times and even harmonics and the electric current containing odd harmonics.This method is not only able to achieve the accurate differentiation of failure, it is not necessary to which attachment device, does not have to transformation electric machine structure, reduce technology difficulty and cost, detect high reliablity.
Description
Technical field
This application involves exciter technical fields, more particularly to a kind of multiphase corner connection brushless exciter rotating diode one
Phase open circuit detection method and system.
Background technique
Excitation system is to guarantee the basis of engine health and power system stability operation, compared to static excitation, due to
Brushless excitation system eliminates the carbon brush and slip ring of generator, significantly improves the reliability of excitation system, is large capacity nuclear power
The preferred excitation mode of unit.Multiphase corner connection brushless exciter can not only reduce high-power excitation system to single diode
The requirement of capacity, moreover it is possible to improve the quality of rectified voltage, improve the fault-tolerance of system, be widely used, but multiphase angle
Connect the rotating rectifier in brushless exciter and be in high speed rotation state, diode is easily damaged when operation, in open circuit therefore
Barrier initial stage exciter remains to provide normal current to main generator, but if failure of leaving, which continues to deteriorate, will seriously affect main power generation
The normal operation of machine, causes serious consequence, and because when diode operation be in high speed rotation state, the monitoring ten to its state
Divide difficulty.
Traditional rotating rectifier faults monitoring method is Hall element detection method, it passes through the detection every phase of rotating rectifier
Electric current whether there is in the set time to determine whether failure, but this method can not detect fuse it is unblown when diode damage
It is bad, and hall element sensor pops one's head in and is easy deterioration, when detection, is also easy to happen malfunction, influences the accuracy of testing result, passes
The rotating rectifier faults monitoring method reliability of system is low.
Summary of the invention
Based on this, it is necessary to for the low problem of traditional rotating rectifier faults monitoring method reliability, provide one kind
Multiphase corner connection brushless exciter rotating diode one-phase open circuit detection method and system.
A kind of multiphase corner connection brushless exciter rotating diode one-phase open circuit detection method, comprising the following steps:
Obtain the exciting current for entering the stator excitation winding of exciter；
The DC component and number of phases harmonic in the exciting current are filtered out, obtains containing odd-times and even-times simultaneously
The electric current of harmonic wave；
The electric current simultaneously containing odd-times and even harmonics is divided into two-way, obtains the first electric current and the second electricity
Stream, will obtain the first delay exciting current after the second current slow fiducial time；
Subtract each other first electric current and the first delay exciting current to obtain the electric current containing odd harmonics；
According to the electric current simultaneously containing odd-times and even harmonics and the electric current containing odd harmonics into
The detection of row rotating diode one-phase open circuit.
A kind of multiphase corner connection brushless exciter rotating diode one-phase open circuit detection system, including acquisition device and processing dress
It sets, the acquisition device connects the processing unit, and the acquisition device connects the stator excitation winding of the exciter；
The acquisition device is used to obtain the exciting current into the stator excitation winding of exciter, and the processing unit is used
In obtaining the exciting current for entering the stator excitation winding of exciter, the DC component and phase several times in the exciting current are filtered out
Frequency component obtains the electric current containing odd-times and even harmonics simultaneously, described will contain simultaneously odd-times and even harmonics
Electric current be divided into two-way, obtain the first electric current and the second electric current, prolong obtaining first after the second current slow fiducial time
Slow exciting current subtracts each other first electric current and the first delay exciting current to obtain the electric current containing odd harmonics,
Rotation two is carried out according to the electric current simultaneously containing odd-times and even harmonics and the electric current containing odd harmonics
The detection of pole pipe one-phase open circuit.
Above-mentioned multiphase corner connection brushless exciter rotating diode one-phase open circuit detection method and system, according to the entrance of acquisition
The exciting current of the stator excitation winding of exciter obtains the electric current containing odd-times and even harmonics simultaneously after being handled
And the electric current containing odd harmonics, when being operated normally due to multiphase corner connection brushless exciter, the electric current containing odd harmonics
With the electric current very little containing even harmonics, and when diode one-phase open circuit occurs, the electric current containing even harmonics be therefore
Hinder characteristic quantity and amplitude significantly increases.By to the electric current simultaneously containing odd-times and even harmonics and containing odd harmonics
Electric current analyzed, extract the electric current for containing even harmonics as breakdown judge foundation, it is brushless multiphase corner connection can be carried out
Exciter rotating diode one-phase open circuit fault detection, this method are not only able to achieve the accurate differentiation of failure, it is not necessary to additional
Device does not have to transformation electric machine structure, reduces technology difficulty and cost, detects high reliablity.
Detailed description of the invention
Fig. 1 is the process of multiphase corner connection brushless exciter rotating diode one-phase open circuit detection method in one embodiment
Figure；
Fig. 2 is stator excitation winding and rotating diode structure chart in one embodiment；
Fig. 3 is the armature rotor potential and armature supply of brushless exciter rotating diode one-phase open circuit in one embodiment
Waveform diagram；
Fig. 4 is size of current figure caused by one-phase open circuit failure in one embodiment；
Fig. 5 is the process of multiphase corner connection brushless exciter rotating diode one-phase open circuit detection method in another embodiment
Figure；
Fig. 6 is the 11 entire transient process in phase brushless excitation system diode one-phase open circuit failures front and back in one embodiment
Current waveform figure；
Fig. 7 is the current waveform figure of 11 phase brushless excitation system rotating diode one-phase open circuit failures in one embodiment；
Fig. 8 is the 39 entire transient process in phase brushless excitation system diode one-phase open circuit failures front and back in one embodiment
Current waveform figure；
Fig. 9 is the current waveform figure of 39 phase brushless excitation system rotating diode one-phase open circuit failures in one embodiment；
Figure 10 is the stream of multiphase corner connection brushless exciter rotating diode one-phase open circuit detection method in further embodiment
Cheng Tu；
Figure 11 is the stream of multiphase corner connection brushless exciter rotating diode one-phase open circuit detection method in another embodiment
Cheng Tu；
Figure 12 is the process of multiphase corner connection brushless exciter rotating diode one-phase open circuit detection method in one embodiment
Schematic diagram；
Figure 13 is the structure of multiphase corner connection brushless exciter rotating diode one-phase open circuit detection system in one embodiment
Block diagram.
Specific embodiment
In order to make the objectives, technical solutions, and advantages of the present invention clearer, by the following examples, it and combines attached
Figure, is described more fully the present invention.It should be appreciated that specific embodiment described herein is only to explain this hair
It is bright, it is not intended to limit the present invention.
In one embodiment, a kind of multiphase corner connection brushless exciter rotating diode one-phase open circuit detection method is provided,
Referring to Figure 1, comprising the following steps:
Step S100: the exciting current for entering the stator excitation winding of exciter is obtained.
Stator excitation winding is also known as armature, is the component for generating electromotive force.Multiphase corner connection brushless exciter is working
When, the certain exciting current of multiphase corner connection brushless exciter is supplied by excitation unit, generates a stationary magnetic field, stator excitation winding
The magnetic field that circumgyration incision generates, induces electromotive force, stator excitation winding is connect with rotating diode, connection type such as Fig. 2
Shown, the AC electromotive force that rotating diode is used to induce stator excitation winding is encouraged after becoming direct electromotive force. for generator
Magnetic is the preferred excitation mode of nuclear power unit.When multiphase corner connection brushless exciter operates normally, each phase armature voltage and current wave
Shape is identical, and when one-phase open circuit failure occurs for the rotating diode of multiphase corner connection brushless exciter, the potential of armature can be caused
It changes with electric current, the electric current for entering stator excitation winding is synchronized in the stator terminal of multiphase corner connection brushless exciter and is adopted
After sample, whether a phase is had occurred by the rotating diode that the analysis to exciting current can detecte multiphase corner connection brushless exciter
Open-circuit fault is reduced costs without changing the original structure of exciter.
Step S200: filtering out the DC component and number of phases harmonic in exciting current, obtain simultaneously containing odd-times and
The electric current of even harmonics.
In exciting current comprising DC component, phase several times reference frequency component, the electric current containing even harmonics and contain
The electric current of odd harmonics, there is also the larger value when phase several times reference frequency component brushless exciter operates normally, not by two
Pole pipe one-phase open circuit failure causes, and the electric current containing even harmonics and the electric current containing odd harmonics include diode event
Hinder characteristic quantity, but amplitude is lower compared with DC component and phase several times reference frequency component, it in actual operation, be from excitation electricity
It is big to carry out analysis operation difficulty to failure for electric current of the extraction containing even harmonics in stream, and filters out the direct current in exciting current point
After the component of amount and phase several times reference frequency, so that it may the electric current containing even harmonics preferably in extraction exciting current,
Realize the detection of multiphase brushless exciter failure.
Step S300: being divided into two-way for the electric current simultaneously containing odd-times and even harmonics, obtains the first electric current and
Two electric currents will obtain the first delay exciting current after the second current slow fiducial time.
The mode for acquiring the low-order harmonic electric current in the electric current simultaneously containing odd-times and even harmonics is not unique,
In one embodiment, the electric current simultaneously containing odd-times and even harmonics two-way be can be divided into, the first electric current and obtained
Two electric currents will obtain the first delay exciting current, contain simultaneously in the first delay exciting current after the second current slow fiducial time
The part of the part and delay that have the electric current of odd-times and even harmonics original, can by characteristic from it is original while contain
It is separated in the current segment for having odd-times and even harmonics, keeps processing more convenient.
Step S400: subtract each other the first electric current and the first delay exciting current to obtain the electric current containing odd harmonics.
Due to the original part of electric current in the first delay exciting current simultaneously containing odd-times and even harmonics and prolong
Odd-times and even harmonics are contained by subtracting each other to filter out the exciting current before delay and after delay in slow part simultaneously
Electric current in non-characteristic, reduce influence of the non-characteristic to testing result, obtain the electric current containing odd harmonics,
Preferably extract the low-order harmonic component in exciting current.
Step S500: according to the electric current simultaneously containing odd-times and even harmonics and the electric current containing odd harmonics into
The detection of row rotating diode one-phase open circuit.
In view of the even-order harmonic component (removing number of phases harmonic) in Stator energization current is by diode one-phase open circuit
Failure causes, by dividing the electric current simultaneously containing odd-times and even harmonics and the electric current containing odd harmonics
Analysis extracts the electric current for containing even harmonics as breakdown judge foundation, is monitoring and the guarantor of diode one-phase open circuit failure
Shield provides an effective approach.
Specifically, Fig. 2 is referred to, without loss of generality, it is assumed that one-phase open circuit failure occurs for the 2nd phase bridge arm, only understands shadow first
Ring the 1st phase and the 2nd phase armature supply, and the armature supply of remaining each phase with it is normal when it is identical.After one-phase open circuit failure occurs,
The 1st phase potential of armature winding collective effect of connecting with the 2nd phase potential is turned it in Bridge 1 arm, thus the 1st phase and after failure
2 phase armature winding flow through same current always.
Under normal operation, each phase armature voltage and electric current successively differ 2n π/m (n=1,2,3 ...) electrical angle, can
To write out the 1st phase and the 2nd phase armature voltage and current expression are as follows:
After failure, each phase armature induction voltage is constant, and the 1st phase and the 2nd is combined to potential are as follows:
After failure the 1st phase armature supply compared to it is normal when lag n π/m, the 2nd phase armature supply compared to it is normal when advanced n π/
M, the expression formula of the 1st phase and the 2nd phase armature supply after failure are as follows:
Fig. 3 is the armature rotor potential and armature supply of multiphase corner connection brushless exciter rotating diode one-phase open circuit failure
Waveform.1,2 phase armature supplys and Δ when regarding the armature supply of 1,2 phases after the 2nd phase bridge arm generation open-circuit fault as normal operation
i1,Δi2Superposition, i.e.,
The armature-reaction magnetic that 1,2 phase currents generate when the armature reaction MMF of 1,2 phases is up when failure operation
Kinetic potential and Δ i1,Δi2The magnetomotive superposition generated.Due to only having the armature supply of 1,2 two-phases to change, only need to consider
Δi1,Δi2The analysis of armature reaction MMF under the 2nd phase bridge arm open-circuit fault can be completed in the synthesis magnetomotive force of generation.It please join
See Fig. 4, Δ i1,Δi2It can indicate are as follows:
To Δ i1Fourier analysis is carried out, can be obtained
Δi1=c0+Σ(akcoskωt+bkSink ω t) k=1,2,3 ... (7)
Wherein:
To Δ i2Fourier analysis is carried out, can be obtained:
Δi2=c0+Σ(akcoskωt+bkSink ω t) k=1,2,3 ... (9)
Wherein:
It can be seen that electric current Δ i1,Δi2In be free of DC component and even harmonics component, only exist fundamental wave and odd-times
Harmonic component.These current components can generate fractional and integer time space harmonics magnetomotive force, fractional and even harmonics magnetic
The sum of induced potential is zero in stator excitation winding, Main Analysis fundamental wave and odd-times space harmonics magnetomotive force stator around
The electromotive force frequency incuded in group.
Fundamental wave and odd-times (k=1,3,5 ...) harmonic current in armature winding can generate fundamental wave and odd-times (j=
1,3,5 ...) space harmonics magnetomotive force.For its j subharmonic magnetomotive force, its number of pole-pairs is j times of fundamental wave, but is turned
Speed is k/j times of fundamental wave.It is k/j-1 times that it, which rotates forward component relative stator revolving speed, and the electromotive force frequency incuded in the stator is base
K-j times of wave.It can similarly obtain, reversion component relative stator revolving speed is k/j+1 times, and the electromotive force frequency incuded in the stator is
K+j times of fundamental wave.The j space harmonics magnetomotive force that k subharmonic current i.e. in armature winding generates can be in stator excitation winding
In induce the harmonic currents of 2,4 equal even numbers frequencys multiplication, carried out using these even-order harmonic electric currents in Stator energization current therefore
Hinder design protection.
Above-mentioned multiphase corner connection brushless exciter rotating diode one-phase open circuit detection method enters exciter according to acquisition
Stator excitation winding exciting current handled after obtain the electric current simultaneously containing odd-times and even harmonics and contain
The electric current of odd harmonics the electric current containing odd harmonics and is contained when being operated normally due to multiphase corner connection brushless exciter
The electric current very little of even harmonics, and when diode one-phase open circuit occurs, the electric current containing even harmonics is fault signature
It measures and amplitude significantly increases.By to the electric current simultaneously containing odd-times and even harmonics and containing the electric current of odd harmonics
It is analyzed, extracts the electric current for containing even harmonics as breakdown judge foundation, multiphase corner connection brushless exciter can be carried out
Rotating diode one-phase open circuit fault detection, this method is not only able to achieve the accurate differentiation of failure, it is not necessary to attachment device, no
With transformation electric machine structure, technology difficulty and cost are reduced, detects high reliablity.
In one embodiment, Fig. 5 is referred to, step S200 includes step S210 to step S230.
Step S210: being divided into two-way for exciting current, obtains the first exciting current and the second exciting current.
The mode for filtering out the DC component and number of phases harmonic in exciting current is not unique, in one embodiment,
Exciting current can be divided into two-way, obtain the first exciting current and the second exciting current, exciting current is divided into after two-way not
The part for including originally in exciting current can only be retained, moreover it is possible to other processing are carried out to by another way exciting current, so as to
The purpose of DC component and number of phases harmonic is filtered out in realization.
Step S220: the second delay exciting current is obtained after the second exciting current is postponed the reference time.
The second delay exciting current is obtained after second exciting current is postponed the reference time, is wrapped in the second delay exciting current
Part containing the second exciting current original part and delay, can be by characteristic from the second original exciting current part
It separates, keeps processing more convenient.
Step S230: the first exciting current and the second delay exciting current are subtracted each other, the direct current point in exciting current is filtered out
Amount and number of phases harmonic, obtain the electric current containing odd-times and even harmonics simultaneously, and the reference time is the benchmark time and encourage
The quotient of the number of phases of magnetomechanical.
The number of phases of exciter is not unique, as long as being greater than 1.Due to including second in the second delay exciting current
The part of exciting current original part and delay can filter out second by subtracting each other the exciting current before delay and after delay
DC component and number of phases harmonic in exciting current obtain the electric current containing odd-times and even harmonics simultaneously, reduce
Influence of the component of DC component and phase several times reference frequency in exciting current to testing result, preferably extraction exciting current
In low-order harmonic component.
In one embodiment, fiducial time is the inverse of twice of exciting current of exciter frequency.Specifically, work as exciter
Exciting current frequency is f0When, fiducial time isReference time isIn the present embodiment, if exciting current are as follows:
In formula: Ifd0For the DC quantity of Stator energization current；K is Stator energization current overtone order；Respectively
For the virtual value and phase angle of Stator energization current k subharmonic；ω0=2 π f0For synchronous angular velocity, wherein f0For synchronizing frequency.
If by Stator energization current each harmonic in t axis direction to right translation 1/ (2mf0), at this moment:
(11) (12) two formula is subtracted each other, is obtained:
From above formula as it can be seen that by Stator energization current and its obtained after the waveform after t axis direction moves to right 1/ (2mf0) subtracts each other
Electric current i1In the no longer multiple subharmonic containing DC quantity and 2m, but remain odd-times and each even harmonics, obtain
Obtain the electric current containing odd-times and even harmonics simultaneously.
Electric current simultaneously containing odd-times and even harmonics is divided into two-way, obtains the first electric current and the second electric current, it will
The first delay exciting current is obtained after second current slow fiducial time, and the first electric current and the first delay exciting current are subtracted each other
To the electric current containing odd harmonics, detailed process is as follows:
By the electric current simultaneously containing odd-times and even harmonics in t axis direction to right translation 1/ (2f0), at this moment:
(13) (14) formula is subtracted each other, is obtained；
From above formula as it can be seen that electric current i2In remain fundamental wave and odd-order harmonic components, as containing the electricity of odd harmonics
Stream.When diode one-phase open circuit failure occurs, exciting current even harmonics amplitude is significantly increased, by simultaneously containing surprise
The electric current with the electric current of even harmonics and containing odd harmonics is analyzed for several times, extracts the electricity containing even harmonics
Stream is used as breakdown judge foundation, can carry out multiphase corner connection brushless exciter rotating diode one-phase open circuit fault detection, reliability
It is high.
By taking 11 mutually angular brushless excitation systems and 39 mutually angular brushless excitation systems as an example, Fig. 6 is 11 mutually angular nothings with Fig. 7
The Stator energization current waveform of brush exciter, Fig. 6 are the waveforms of entire transient process before and after failure, and in t=10s, diode is sent out
Raw one-phase open circuit failure, then the normal steady state operating status before the waveforms stands failure of t<10s, the waveforms stands hair of t>10s
Transient process after raw failure, the stable state waveform (similarly hereinafter) after Fig. 7 representing fault.To Stator energization current stable state electricity before and after failure
Stream carries out Fourier analysis, the results are shown in Table 1.
Table 1
Equally, Fig. 8 is the Stator energization current waveform of 39 mutually angular brushless exciters, fault time 5s, the electricity with Fig. 9
The Fourier analysis of stream the results are shown in Table 2.
Table 2
From Tables 1 and 2, it can be seen that, brushless excitation system is after occurring diode one-phase open circuit failure, stator excitation electricity
Contain biggish 2,4,6 etc. even-order harmonics components in stream, these harmonic waves are caused by diode one-phase open circuit failure, can be with
These harmonic waves are according to progress malfunction monitoring and protection.
In one embodiment, referring to Figure 10, step S500 includes step S510 to step S530.
Step S510: it is obtained containing odd-times and even number simultaneously according to the electric current simultaneously containing odd-times and even harmonics
The electric current stable state virtual value of subharmonic.
Electric current simultaneously containing odd-times and even harmonics is the value that a size and Orientation is changed by sinusoidal rule, is
The instantaneous value of variation, the electric current stable state virtual value simultaneously containing odd-times and even harmonics refers to contains odd-times and idol simultaneously
The electric energy that the electric current of harmonic wave consumes in one cycle for several times accurately, can be characterized steadily and contain odd-times and even number simultaneously
The size of the electric current of subharmonic.
Step S520: the electric current stable state virtual value containing odd harmonics is obtained according to the electric current containing odd harmonics.
Electric current containing odd harmonics is the value that a size and Orientation is changed by sinusoidal rule, is the instantaneous of variation
Value, the electric current stable state virtual value containing odd harmonics refer to the electricity that the electric current containing odd harmonics consumes in one cycle
Can, it can accurately, steadily characterize the size of the electric current containing odd harmonics.
Step S530: according to simultaneously containing odd-times and even harmonics electric current stable state virtual value and containing odd-times it is humorous
The electric current stable state virtual value of wave carries out the detection of rotating diode one-phase open circuit.
It containing the electric current stable state virtual value of odd-times and even harmonics characterization is simultaneously simultaneously containing odd-times and idol
The root-mean-square value of the electric current of harmonic wave in one cycle for several times, the electric current stable state virtual value characterization containing odd harmonics is to contain
Have the root-mean-square value of the electric current of odd harmonics in one cycle, according to the electric current stable state virtual value containing odd harmonics and
Contain foundation of the electric current stable state virtual value of odd-times and even harmonics as breakdown judge simultaneously, electric current can be effectively reduced
Detection error caused by being mutated, the accurate differentiation that this method is not only able to achieve failure reduce it is not necessary to which electric machine structure is transformed
Technology difficulty and cost detect high reliablity.It, can also be to containing odd harmonics it is appreciated that in other embodiments
Electric current and electric current simultaneously containing odd-times and even harmonics revolve after carrying out other processing as multiphase corner connection brushless exciter
The foundation for turning the judgement of diode one-phase open circuit, as long as those skilled in the art think may be implemented.
In one embodiment, referring to Figure 11, step S510 includes step S511 and step S512.
Step S511: quadratic sum of the electric current in a current cycle simultaneously containing odd-times and even harmonics is obtained
Mean value.
Step S512: obtaining the arithmetic square root of the mean value of quadratic sum, obtains containing odd-times and even harmonics simultaneously
Electric current stable state virtual value.
Specifically, step S511 and step S512 include:
Wherein, I1Indicate the electric current stable state virtual value containing odd-times and even harmonics simultaneously, i1It indicates simultaneously containing surprise
For several times with the electric current of even harmonics, in the period of T expression exciting current, t indicates to obtain the sampling time of exciting current.By formula
(16) it can be obtained according to the electric current simultaneously containing odd-times and even harmonics simultaneously containing odd-times and even harmonics
Electric current stable state virtual value.It is appreciated that in other embodiments, T is also possible to the other times value that user sets according to demand,
As long as those skilled in the art think may be implemented.
In one embodiment, referring to Figure 11, step S520 includes step S521 and step S522.
Step S521: the mean value of quadratic sum of the electric current containing odd harmonics in a current cycle is obtained.
Step S522: obtaining the arithmetic square root of the mean value of quadratic sum, and obtaining the electric current stable state containing odd harmonics has
Valid value.
Specifically, step S521 and step S522 include:
Wherein, I2Indicate the electric current stable state virtual value containing odd harmonics, i2Indicate the electric current containing odd harmonics, T
Indicate the period of exciting current, t indicates to obtain the sampling time of exciting current.It can be according to containing odd harmonics by formula (17)
Electric current obtain the electric current stable state virtual value containing odd harmonics.It is appreciated that in other embodiments, T is also possible to use
The other times value that family is set according to demand, as long as those skilled in the art think may be implemented.
In one embodiment, referring to Figure 11, step S530 includes step S531 and step S532.
Step S531: electric current stable state virtual value simultaneously containing odd-times and even harmonics and humorous containing odd-times is obtained
The ratio of the electric current stable state virtual value of wave.
Brushless excitation system contains biggish 2,4,6 after diode one-phase open circuit failure occurs in Stator energization current
Etc. even-order harmonics component, these harmonic waves be to be caused by diode one-phase open circuit failure.Theoretically, can select these harmonic waves into
Row malfunction monitoring and protection, but there are the following problems: Stator energization current even-order harmonic after rotating rectifier one-phase open circuit failure
It obviously increases, if only considered using the stable state virtual value of even-order harmonic as threshold decision failure, it may be difficult to and rotating rectifier
One pipe failure and motor internal fault distinguish.In addition, front and back occurs for failure, base is not contained in Stator energization current theoretically
Wave and odd-order harmonic components, but exciter operate normally when due to motor manufacturing error, can also have the base of low content
Wave and odd harmonics current component, moreover, the exciting current harmonic component of number of phases frequency multiplication is when operating normally, there is also larger
Value, is not caused by diode one-phase open circuit failure, needs the consideration in fail-safe design.
In view of the even-order harmonic component (removing number of phases harmonic) in Stator energization current is by diode one-phase open circuit
Failure causes, and the electric current stable state that odd-times and even harmonics are contained while finding out in exciter stator exciting current is effective
Value, and the ratio between the electric current stable state virtual value containing odd harmonics, no matter exciter operates normally or that a tube open circuit occurs is former
Barrier or other internal fault, the value of the ratio all can be lower, and when one-phase open circuit event occurs for brushless exciter rotating diode
When barrier, the ratio is higher, therefore the foundation that the ratio is judged as error protection, can distinguish the one-phase open circuit event of diode
Barrier and other failures, reliability is very high, provides an effective approach for the monitoring and protection of diode one-phase open circuit failure.
Step S532: when ratio is more than preset threshold, judge that one-phase open circuit occurs in the rotating diode of exciter
Failure.
Preset threshold is the threshold value that user has determined before carrying out fault detection, and the value of preset threshold is not only
One, according to the difference of brushless exciter type, value is also different in different situations for preset threshold, for same nothing
Brush exciter, due to working environment or the difference of other conditions, preset threshold can also be adjusted according to actual needs, as long as ability
Field technique personnel think may be implemented.
In one embodiment, preset threshold 1000.Specifically, by taking 11 phases and 39 phase brushless excitation systems as an example, table 3
11 phases and 39 phase brushless excitation systems normal operation that method to be recorded according to above-described embodiment obtains mutually are opened with diode one
The i obtained when road1With i2The ratio of virtual value, wherein i1For the electric current simultaneously containing odd-times and even harmonics, i2For containing
The electric current of odd harmonics.
Table 3
As shown in Table 3, i1With i2The ratio of virtual value can reflect diode one-phase open circuit failure bring feature, and energy
Enough it is different from exciter normal operation and one tube open circuit failure of rotating rectifier and exciter internal fault, and i when failure operation1
With i2The ratio of virtual value is all larger than 1000, illustrates this multiphase corner connection brushless exciter rotating diode one-phase open circuit detection side
Method can detect the one-phase open circuit failure of rotating diode, high reliablity.
In one embodiment, step S400 can be realized by step S410.
Step S410: subtracting each other the first electric current and the first delay exciting current by reverse phase add circuit or difference channel,
Obtain the electric current containing odd harmonics.
Specifically, it not is unique for executing to the mode that the first electric current and first postpone the movement that exciting current subtracts each other,
Such as the first electric current and the first delay exciting current can be subtracted each other by reverse phase add circuit or difference channel, it obtains containing surprise
The electric current of harmonic wave for several times.Reverse phase add circuit is also known as differential input computing circuit, when being calculated using reverse phase add circuit,
It is first right that first electric current and the first delay exciting current subtract each other input non-inverting input terminal and inverting input terminal, reverse phase add circuit respectively
The signal of inverting input terminal access realizes reverse phase, then does add operation again, realizes the first electric current and the first delay excitation electricity
The movement that stream subtracts each other.Difference channel is anti-phase input and the amplifying circuit that homophase input combines, in ideal operational amplifier, electricity
Empty short phenomenon is regarded on road as, and difference channel can be used for realizing that two voltages subtract each other, and production is simple, at low cost.
Above-described embodiment in order to better understand is specifically illustrated with one embodiment below.In a reality
It applies in example, referring to Figure 12, firstly, the exciting current in stator excitation winding is sampled in brushless exciter generator terminal, and
Sampled data is sent into computer, collected electric current is then divided into two-way, all the way electric current ifdIt is that the electric current that will acquire is direct
It is sent to adder, another way electric current i 'fdIt is that the electric current that will be acquired passes through a 1/ (2mf0) second delay circuit after be re-fed into
Adder, m are the armature of exciter winding number of phases, f0For brushless exciter rated frequency, adder is by two-way electric current ifd、i′fdPhase
Subtract to obtain the electric current i for containing only odd-times and each even harmonics component (except 2m frequency multiplication amount)1, then obtained electric current is divided into two
Road, electric current is by i all the way1It is directly sent to adder, another way electric current i '1It is by i1By a 1/ (2f0) second delay circuit
After be re-fed into adder, adder is by two-way electric current i1、i′1Subtract each other to obtain the electric current i containing only odd-order harmonic components2, and press
Following formula finds out electric current i respectively1、i2Stable state virtual value I1、I2:
Wherein: T is the period of electric current, and t is time, T=P/f0, P is number of pole-pairs；
WhenWhen, judge that one-phase open circuit failure occurs for rotating rectifier.
In one embodiment, a kind of multiphase corner connection brushless exciter rotating diode one-phase open circuit detection system is provided,
Referring to Figure 13, including acquisition device 110 and processing unit 120, acquisition device 110 connect processing unit 120, acquisition device
The stator excitation winding of 110 connection exciters, acquisition device 110 are used to obtain the excitation into the stator excitation winding of exciter
Electric current, processing unit 120 are used to obtain the exciting current into the stator excitation winding of exciter, filter out straight in exciting current
Flow component and number of phases harmonic obtain the electric current containing odd-times and even harmonics simultaneously, will simultaneously containing odd-times and
The electric current of even harmonics is divided into two-way, obtains the first electric current and the second electric current, will obtain after the second current slow fiducial time
First delay exciting current subtracts each other the first electric current and the first delay exciting current to obtain the electric current containing odd harmonics, root
It is mutually opened according to rotating diode one is carried out with the electric current containing odd harmonics with the electric current of even harmonics containing odd-times simultaneously
Road detection.
Above-mentioned multiphase corner connection brushless exciter rotating diode one-phase open circuit detection method and system, according to the entrance of acquisition
The exciting current of the stator excitation winding of exciter obtains the electric current containing odd-times and even harmonics simultaneously after being handled
And the electric current containing odd harmonics, when being operated normally due to multiphase corner connection brushless exciter, the electric current containing odd harmonics
With the electric current very little containing even harmonics, and when diode one-phase open circuit occurs, the electric current containing even harmonics be therefore
Hinder characteristic quantity and amplitude significantly increases.By to the electric current simultaneously containing odd-times and even harmonics and containing odd harmonics
Electric current analyzed, extract the electric current for containing even harmonics as breakdown judge foundation, it is brushless multiphase corner connection can be carried out
Exciter rotating diode one-phase open circuit fault detection, this method are not only able to achieve the accurate differentiation of failure, it is not necessary to additional
Device does not have to transformation electric machine structure, reduces technology difficulty and cost, detects high reliablity.
Each technical characteristic of embodiment described above can be combined arbitrarily, for simplicity of description, not to above-mentioned reality
It applies all possible combination of each technical characteristic in example to be all described, as long as however, the combination of these technical characteristics is not deposited
In contradiction, all should be considered as described in this specification.
The embodiments described above only express several embodiments of the present invention, and the description thereof is more specific and detailed, but simultaneously
It cannot therefore be construed as limiting the scope of the patent.It should be pointed out that coming for those of ordinary skill in the art
It says, without departing from the inventive concept of the premise, various modifications and improvements can be made, these belong to protection of the invention
Range.Therefore, the scope of protection of the patent of the invention shall be subject to the appended claims.
Claims (10)
1. a kind of multiphase corner connection brushless exciter rotating diode one-phase open circuit detection method, which is characterized in that including following step
It is rapid:
Obtain the exciting current for entering the stator excitation winding of exciter；
The DC component and number of phases harmonic in the exciting current are filtered out, obtains containing odd-times and even harmonics simultaneously
Electric current；
The electric current simultaneously containing odd-times and even harmonics is divided into two-way, obtains the first electric current and the second electric current, it will
The first delay exciting current is obtained after the second current slow fiducial time；
Subtract each other first electric current and the first delay exciting current to obtain the electric current containing odd harmonics；
It is revolved according to the electric current simultaneously containing odd-times and even harmonics and the electric current containing odd harmonics
Turn the detection of diode one-phase open circuit.
2. the method according to claim 1, wherein the DC component and phase filtered out in the exciting current
Several times frequency component, the step of obtaining the electric current simultaneously containing odd-times and even harmonics, comprising the following steps:
The exciting current is divided into two-way, obtains the first exciting current and the second exciting current；
The second delay exciting current is obtained after second exciting current is postponed the reference time；
First exciting current and the second delay exciting current are subtracted each other, the DC component in the exciting current is filtered out
With number of phases harmonic, the electric current containing odd-times and even harmonics simultaneously is obtained, when the reference time is the benchmark
Between quotient with the number of phases of the exciter.
3. the method according to claim 1, wherein the fiducial time is twice of exciting current of exciter
The inverse of frequency.
4. the method according to claim 1, wherein described humorous containing odd-times and even-times simultaneously according to
The step of electric current of wave and the electric current containing odd harmonics carry out the detection of rotating diode one-phase open circuit, including following step
It is rapid:
It is obtained simultaneously according to the electric current simultaneously containing odd-times and even harmonics containing odd-times and even harmonics
Electric current stable state virtual value；
The electric current stable state virtual value containing odd harmonics is obtained according to the electric current containing odd harmonics；
According to the electric current stable state virtual value simultaneously containing odd-times and even harmonics and described containing odd harmonics
Electric current stable state virtual value carries out the detection of rotating diode one-phase open circuit.
5. according to the method described in claim 4, it is characterized in that, described humorous containing odd-times and even-times simultaneously according to
The electric current of wave obtains the step of electric current stable state virtual value simultaneously containing odd-times and even harmonics, comprising the following steps:
Obtain the mean value of the quadratic sum of the electric current in a current cycle simultaneously containing odd-times and even harmonics；
The arithmetic square root for obtaining the mean value of the quadratic sum obtains the electric current containing odd-times and even harmonics simultaneously
Stable state virtual value.
6. according to the method described in claim 4, it is characterized in that, the electric current according to containing odd harmonics obtains
The step of electric current stable state virtual value containing odd harmonics, comprising the following steps:
Obtain the mean value of the quadratic sum of the electric current containing odd harmonics in a current cycle；
The arithmetic square root for obtaining the mean value of the quadratic sum obtains the electric current stable state virtual value containing odd harmonics.
7. according to the method described in claim 4, it is characterized in that, described humorous containing odd-times and even-times simultaneously according to
The electric current stable state virtual value of wave and the electric current stable state virtual value containing odd harmonics carry out rotating diode one-phase open circuit
The step of detection, comprising the following steps:
Obtain the electric current stable state virtual value simultaneously containing odd-times and even harmonics and described containing odd harmonics
The ratio of electric current stable state virtual value；
When the ratio is more than preset threshold, judge that one-phase open circuit failure occurs in the rotating diode of the exciter.
8. the method according to the description of claim 7 is characterized in that the preset threshold is 1000.
9. the method according to claim 1, wherein described contain odd-times and even-times for described first simultaneously
The electric current of harmonic wave and the first delay exciting current subtract each other the step of obtaining the electric current containing odd harmonics, including following step
It is rapid:
First electric current and the first delay exciting current are subtracted each other by reverse phase add circuit or difference channel, contained
There is the electric current of odd harmonics.
10. a kind of multiphase corner connection brushless exciter rotating diode one-phase open circuit detection system, which is characterized in that filled including acquisition
It sets and processing unit, the acquisition device connects the processing unit, the stator that the acquisition device connects the exciter is encouraged
Magnetic winding；
The acquisition device is used to obtain the exciting current into the stator excitation winding of exciter, and the processing unit is for obtaining
The exciting current into the stator excitation winding of exciter is taken, the DC component and the number of phases times frequency division in the exciting current are filtered out
Amount, obtains the electric current containing odd-times and even harmonics simultaneously, by the electricity containing odd-times and even harmonics simultaneously
Flow point is two-way, obtains the first electric current and the second electric current, is encouraged the first delay is obtained after the second current slow fiducial time
Magnetoelectricity stream subtracts each other first electric current and the first delay exciting current to obtain the electric current containing odd harmonics, according to
The electric current simultaneously containing odd-times and even harmonics and the electric current containing odd harmonics carry out rotating diode
One-phase open circuit detection.
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