CN109472972A - Electric slip ring fault detection method and device - Google Patents
Electric slip ring fault detection method and device Download PDFInfo
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- CN109472972A CN109472972A CN201710807143.7A CN201710807143A CN109472972A CN 109472972 A CN109472972 A CN 109472972A CN 201710807143 A CN201710807143 A CN 201710807143A CN 109472972 A CN109472972 A CN 109472972A
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- electric slip
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- G—PHYSICS
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- G08C—TRANSMISSION SYSTEMS FOR MEASURED VALUES, CONTROL OR SIMILAR SIGNALS
- G08C25/00—Arrangements for preventing or correcting errors; Monitoring arrangements
Abstract
The embodiment of the invention provides a kind of electric slip ring fault detection method and devices.The electric slip ring fault detection method includes: the communication signal on the fieldbus that acquisition is connect with electric slip ring；Determine the electric slip ring with the presence or absence of failure according to the communication signal.Electric slip ring fault detection method and device provided by the invention, by the way of the communication signal on the fieldbus that on-line checking is connect with electric slip ring, to electric slip ring, whether failure determines, the normal work of electric slip ring is not influenced, and can accurately, timely find failure, field maintenance person can get out components or spare slip ring in advance, care and maintenance slip ring in advance is removed in fixed maintenance time rather than fault time, to guarantee the zero failure time of electric slip ring equipment, the work difficulty of field maintenance person is reduced.
Description
Technical field
The present embodiments relate to technical field of wind power generator more particularly to a kind of electric slip ring fault detection methods and dress
It sets.
Background technique
The pitch-controlled system in control system to wheel hub using the wind power generating set of electric variable pitch technology, in cabin
Between, the mode of electric slip ring is generallyd use to transmit field bus communication signal.The characteristics of working method intrinsic due to electric slip ring, i.e.,
The close contact of brush and slideway, the problem of inevitably bringing friction.Therefore, electric slip ring longtime running will will lead to electricity
The abrasion of brush and slideway, and then lead to the increase of swept resistance between brush and slideway, so that the communication quality of electric slip ring is influenced, into
And influence the stability and reliability of wind power generating set operation.
In the prior art, the performance condition and fault condition of electric slip ring can only by wind power generating set maintenance personnel according to
Micro-judgment, and the electric slip ring of suspected malfunctions is disassembled from wind-driven generator, then new electric slip ring is installed to blower
On, then the electric slip ring of suspected malfunctions is taken between laboratory or overhaul of the equipments, is installed on monitor station or is connected to special inspection
On measurement equipment, energization measures its swept resistance, if discovery swept resistance is more than a certain threshold value, determines that this electric slip ring has event
Barrier.
In the implementation of the present invention, the discovery prior art at least has following defects that the event of 1) electric slip ring to inventor
Barrier judgement can only be after the appearance of electric slip ring suspected malfunctions, and being disassembled just can determine that after being tested, and belong to failure thing
After determine, therefore can not accurately, timely find failure.2) failure determines this Breakdown Maintenance mode afterwards, determines failure
Unpredictability before processing, field maintenance person can only electric slip ring suspected malfunctions appearance after, to suspected malfunctions electric slip ring into
Row replacement, so that the work of field maintenance person is very passive, increases maintenance time.It is tight for Breakdown Maintenance time check requirements
The project of lattice, such as international pro-ject, marine project, this mode increase the work difficulty of field maintenance person.
Summary of the invention
The embodiment of the present invention provides a kind of electric slip ring fault detection method and device, with it is accurate, timely find failure, drop
The work difficulty of low field maintenance person.
In order to achieve the above objectives, the present invention adopts the following technical scheme:
On the one hand, the present invention provides a kind of electric slip ring fault detection method, comprising: the scene that acquisition is connect with electric slip ring is total
Communication signal on line；Determine the electric slip ring with the presence or absence of failure according to the communication signal.
On the other hand, the present invention also provides a kind of electric slip ring fault detection means, comprising: acquisition module, for acquire with
Communication signal on the fieldbus of electric slip ring connection；Determining module, for determining the electric slip ring according to the communication signal
With the presence or absence of failure.
Electric slip ring fault detection method and device provided by the invention, the scene being connect using on-line checking with electric slip ring are total
The mode of communication signal on line, to electric slip ring, whether failure determines, does not influence the normal work of electric slip ring, and can be quasi-
Really, failure is timely found, field maintenance person can get out components or spare slip ring in advance, in fixed maintenance time
Rather than fault time removes care and maintenance slip ring in advance, to guarantee the zero failure time of electric slip ring equipment, reduces scene
The work difficulty of maintenance personnel.
The above description is only an overview of the technical scheme of the present invention, in order to better understand the technical means of the present invention,
And it can be implemented in accordance with the contents of the specification, and in order to allow above and other objects of the present invention, feature and advantage can
It is clearer and more comprehensible, the followings are specific embodiments of the present invention.
Detailed description of the invention
By reading the following detailed description of the preferred embodiment, various other advantages and benefits are common for this field
Technical staff will become clear.The drawings are only for the purpose of illustrating a preferred embodiment, and is not considered as to the present invention
Limitation.And throughout the drawings, the same reference numbers will be used to refer to the same parts.In the accompanying drawings:
Fig. 1 is the structural representation that electric slip ring is applied between the cabin and wheel hub of typical electronic paddle changing wind power generator group
Figure；
Fig. 2 is the simplified structural schematic diagram of Fig. 1；
Fig. 3 is the schematic view of the mounting position of electric slip ring fault detection means provided by the invention；
Fig. 4 is the flow diagram of electric slip ring fault detection method one embodiment provided by the invention；
Fig. 5 is the flow diagram of another embodiment of electric slip ring fault detection method provided by the invention；
Fig. 6 is the input/output signal schematic diagram of electric slip ring fault detection means provided by the invention；
Fig. 7 is the flow diagram that electric slip ring fault detection is carried out according to the voltage of communication signal, waveform and distortion；
Fig. 8 is the waveform diagram of the corresponding communication signal of open circuit fault；
Fig. 9 is the waveform diagram of the corresponding communication signal of short trouble；
Figure 10 is the waveform diagram one that rate of decay crosses the corresponding communication signal of major break down；
Figure 11 is the waveform diagram two that rate of decay crosses the corresponding communication signal of major break down；
Figure 12 is the waveform diagram three that rate of decay crosses the corresponding communication signal of major break down；
Figure 13 is the structural schematic diagram of electric slip ring fault detection means one embodiment provided by the invention.
Specific embodiment
Exemplary embodiments of the present disclosure are described in more detail below with reference to accompanying drawings.Although showing the disclosure in attached drawing
Exemplary embodiment, it being understood, however, that may be realized in various forms the disclosure without should be by embodiments set forth here
It is limited.On the contrary, these embodiments are provided to facilitate a more thoroughly understanding of the present invention, and can be by the scope of the present disclosure
It is fully disclosed to those skilled in the art.
The electric slip ring fault detection method and device of the embodiment of the present invention to clearly illustrate, with reference to the accompanying drawing to the present invention
The electric slip ring fault detection method of embodiment and the application scenarios of device are illustrated.
Fig. 1 is the structural representation that electric slip ring is applied between the cabin and wheel hub of typical electronic paddle changing wind power generator group
Figure.As shown in Figure 1, between pitch-controlled system in control system to wheel hub in cabin, come the scene of transmitting by the way of electric slip ring
Bus communication signal.Fig. 1 can simplify as structural schematic diagram shown in Fig. 2, as shown in Fig. 2, electric slip ring is located at cabin internal bus
On fieldbus between main website and wheel hub internal bus substation 1, the communication signal that is used for transmission in fieldbus.
Fig. 3 is the schematic view of the mounting position of electric slip ring fault detection means provided by the invention.As shown in figure 3, of the invention
The electric slip ring fault detection means of offer, is set on the fieldbus connecting with electric slip ring, specifically can be and be set to cabin
On fieldbus between internal bus main website and electric slip ring, or the scene being set between wheel hub internal bus substation 1 and electric slip ring
In bus, to realize online acquisition and detect the purpose of the communication signal on the fieldbus connecting with electric slip ring, do not influence
Electric slip ring works normally.
Electric slip ring of embodiment of the present invention fault detection method and device are described in detail with reference to the accompanying drawing.
Embodiment one
Fig. 4 is the flow diagram of electric slip ring fault detection method one embodiment provided by the invention.As shown in figure 4,
The electric slip ring fault detection method of the embodiment of the present invention, specifically includes:
S401 acquires the communication signal on the fieldbus connecting with electric slip ring.
Specifically, as shown in figure 3, being mounted on electric slip ring fault detection means on the fieldbus being connect with electric slip ring,
Under the premise of not influencing electric slip ring normal work, communication signal on the fieldbus that online acquisition is connect with electric slip ring.
S402 determines electric slip ring with the presence or absence of failure according to communication signal.
Specifically, each electric parameter or characteristic quantity to collected communication signal are analyzed, whether electric slip ring is determined
There are failures.
The electric slip ring fault detection method of the embodiment of the present invention, on the fieldbus being connect using on-line checking with electric slip ring
Communication signal mode, to electric slip ring, whether failure determines, do not influence the normal work of electric slip ring, and can it is accurate,
Timely find failure, field maintenance person can get out components or spare slip ring in advance, in fixed maintenance time and
It is not fault time to remove care and maintenance slip ring in advance, to guarantee the zero failure time of electric slip ring equipment, reduces live dimension
The work difficulty of shield personnel.And can effectively reduce in wind power generating set because of the number of stoppages caused by electric slip ring, wind is improved indirectly
The quality of power generator group communication signal in fieldbus (such as Profibus) reduces wind power generating set scene indirectly
The number of bus communication failure extends wind power generating set average time between failures (Mean Time Between
Failure, abbreviation MTBF).
Embodiment two
Fig. 5 is the flow diagram of another embodiment of electric slip ring fault detection method provided by the invention.Such as Fig. 5 institute
Show, on the basis of example 1, the electric slip ring fault detection method of the embodiment of the present invention is specific can include:
S501 acquires the communication signal on the fieldbus connecting with electric slip ring.
Specifically, step S501 is identical as the step S401 in embodiment one, details are not described herein again.
Step S402 in embodiment one can specifically include following steps S502.
S502 determines electric slip ring with the presence or absence of failure according to the voltage, waveform, and/or distortion of communication signal.
Specifically, the combination to one or more of the following electric parameter of collected communication signal or characteristic quantity:
Voltage, waveform and distortion, are analyzed, and determine electric slip ring with the presence or absence of failure.
As the first feasible embodiment, can by the standard value with voltage, and/or waveform, and/or distortion into
The mode that row compares determines electric slip ring with the presence or absence of failure.I.e. step S502 specifically can comprise the following steps that according to communication signal
Voltage and normal voltage comparison result, the waveform of communication signal and the comparison result of reference waveform, and/or communication signal
The comparison result of distortion and standard distortion determines electric slip ring with the presence or absence of failure.
Further, according to the voltage of communication signal and normal voltage, the waveform of communication signal and reference waveform, and/or
The distortion of communication signal and standard distortion, determine that electric slip ring whether there is failure, specifically can include:
Communication signal voltage detecting: when the voltage of communication signal and the ratio of normal voltage are less than the first setting voltage threshold
When (such as 30%), output voltage failure alarm signal immediately；Alternatively, when the voltage of communication signal and the ratio of normal voltage are small
When second setting voltage threshold (such as 40%), postpone the first setting time (such as 2 hours) output voltage fault alarm afterwards
Signal；And/or
Communication signal waveforms detection: when the waveform of communication signal and the ratio of reference waveform are less than the first setting waveform threshold value
When (such as 30%), output waveform failure alarm signal immediately；Alternatively, when the waveform of communication signal and the ratio of reference waveform are small
When second setting waveform threshold value (such as 40%), postpone the second setting time (such as 2 hours) output waveform fault alarm afterwards
Signal；And/or
Communication signal Distortion Detect: when the ratio of the distortion of communication signal and standard distortion is greater than the first setting distortion threshold value
When (such as 30%), the failure alarm signal of output distortion immediately；Alternatively, when the distortion of communication signal and the ratio that distorts of standard are big
When second setting distortion threshold value (such as 20%), delay third setting time (such as 2 hours) exports distortion fault alarm afterwards
Signal.
Wherein, the second setting voltage threshold is greater than the first setting voltage threshold, and the second setting waveform threshold value is greater than first and sets
Standing wave shape threshold value, the second setting distortion threshold value is less than the first setting distortion threshold value.
Fig. 6 is the input/output signal schematic diagram of electric slip ring fault detection means provided by the invention.As shown in fig. 6, defeated
Failure alarm signal out can be 24V on-off model or 485 bus signals or Conventional acousto-optic alarm signal.
Fig. 7 is the flow diagram that electric slip ring fault detection is carried out according to the voltage of communication signal, waveform and distortion.Such as figure
Shown in 7, after electric slip ring fault detection means is opened, equipment self-inspection is carried out first.If equipment fault, output equipment fault alarm
Signal carries out communication signal voltage detecting if equipment is normal.If electric voltage exception, output voltage failure alarm signal, if electric
Positive pressure is normal, then carries out communication signal waveforms detection.If Wave anomaly, output waveform failure alarm signal, if waveform is normal,
Carry out communication signal Distortion Detect.If Anomaly, distortion failure alarm signal is exported, if distortion is normal, Returning communication
Signal voltage detecting step.
It, can be comprehensive according to the voltage of communication signal, waveform and distortion calculating one as second of feasible embodiment
It closes index, that is, communication signal quality and electric slip ring is determined according to the mode being compared with the standard value of the quality of communication signal
With the presence or absence of failure.That is step S502 specifically can comprise the following steps that the voltage, waveform and distortion according to communication signal, calculate
The quality of communication signal；According to the comparison result of the quality of communication signal and standard quality, determine electric slip ring with the presence or absence of failure.
Further, according to the quality of communication signal and standard quality, determine that electric slip ring with the presence or absence of failure, can specifically wrap
It includes:
When the ratio of the quality of communication signal and standard quality is less than first setting quality threshold (such as 30%), immediately
Export quality fault alarm signal；Alternatively, when the quality of communication signal and the ratio of standard quality are less than the second setting quality threshold
When being worth (such as 40%), delay the 4th setting time (such as 2 hours) exports quality fault alarm signal afterwards.
Wherein, the second setting quality threshold is greater than the first setting quality threshold, and the quality of communication signal can be believed according to communication
Number voltage, waveform and distortion and corresponding weight calculation obtain.
As the third feasible embodiment, electric slip ring can be determined according to the voltage, waveform and distortion of communication signal
Specifically there is which kind of failure.Separately below by taking " open circuit " failure, " short circuit " failure and " rate of decay is excessive " failure as an example into
Row explanation:
1) " open circuit " failure
When the brush contact of electric slip ring is bad or the communication channel of electric slip ring open circuit fault occurs, it will cause and transmitted
Communication signal reflects, and will appear from collected communication signal waveform judgement i.e. high level signal and low level signal bright
The wave crest of aobvious big rise and big fall, as shown in Figure 8.In particular, the main website of usually electric slip ring distance communication equipment and substation distance are very
Closely, therefore the interference of such high intensity can make the message of communication signal impaired, so as to cause communication failure.
The judgment method of such failure is as follows: if the waveform of communication signal is during low level signal (such as in Fig. 8
During t0-t2), there are two the first skip signals to high level direction, and attenuation relation is presented in two the first skip signals,
Effective status (signal voltage absolute value is less than 2V) then is set by low level signal distortion flag bit, and records two first jumps
The voltage magnitude (such as being 3.2V, 1.5V in Fig. 8) of varying signal and the voltage magnitude ratio (1.5/ of two the first skip signals
3.2=50%)；
If the waveform of communication signal, during high level signal (such as during the t2-t3 in Fig. 8), there are two to low electricity
Square to the second skip signal, and attenuation relations are presented in two the second skip signals, then high level signal distort flag bit
It is set as effective status (signal voltage absolute value be less than 2V), and records voltage magnitude (such as Fig. 8 of two the second skip signals
In be 2.6V, 1.2V) and two the second skip signals voltage magnitude ratio (1.2/2.6=46%)；
If low level signal distortion flag bit and high level signal distortion flag bit are effective status, and two first are jumped
Difference (the 50%-46% of the voltage magnitude ratio (46%) of the voltage magnitude ratio (50%) and two the second skip signals of varying signal
=4%), with the voltage magnitude ratio of the voltage magnitude of two the first skip signals ratio (50%) and two the second skip signals
(46%) ratio (4%/50%=8%) of biggish voltage magnitude ratio (max (50%, 46%)=50%) in is less than setting
Amplitude Ration threshold value (such as 20%) then sets effective status for electric slip ring communication off state flag bit；
If it is effective status that electric slip ring, which communicates off state flag bit, the distance S1 of fault point distance test point is calculated；
Wherein, the distance S1 calculating process of fault point distance test point is as follows: according to the period (t1-t0 of first the first skip signal
=0.07 μ s) and the communication signal transmission speed (such as 4.2nm/s) in bus at the scene, calculate fault point distance test point
Distance S1 (S1=0.07 μ s*4.2nm/s/2=8.3m).
If the difference of the distance S0 (8m) of the distance S1 (8.3m) and electric slip ring of fault point distance test point apart from test point
(S1-S0=0.3m) it is less than set distance threshold value (such as 0.5m), it is determined that the brush contact of electric slip ring is bad or electric slip ring
There is " open circuit " failure in communication channel.
2) " short circuit " failure
When the communications line of the communication channel of electric slip ring or electric slip ring occur " short circuit " failure when, will cause transmitted lead to
News signal reflects, as shown in Figure 9.In particular, the main website of usually electric slip ring distance communication equipment and substation be apart from close, therefore
The interference of such high intensity can make the message of communication signal impaired, so as to cause communication failure.
The judgment method of such failure is as follows: if the waveform of communication signal is during high level signal (such as in Fig. 9
During t2-t4), the average voltage (such as being 1.2V in Fig. 9) of high level signal is lower than the standard voltage value of high level signal
(such as 3V) then sets effective status for the low flag bit of high level signal voltage；
If the waveform of communication signal is during high level signal (such as during the t2-t4 in Fig. 9), the height of preceding half period
The average voltage (such as being 1.8V in Fig. 9) of level signal is greater than the average voltage of the high level signal of second half of the cycle
(such as being 0.9V in Fig. 9), and the height of average voltage (0.9V) and preceding half period of the high level signal of second half of the cycle
The ratio (0.9V/1.8V=0.5) of the average voltage (1.8V) of level signal is less than setting average voltage fractional threshold
(such as 0.7) then sets effective status for high level signal voltage attenuation flag bit；
If the waveform of communication signal is during low level signal (such as during the t1-t2 in Fig. 9), the electricity of low level signal
It flattens mean value (such as being -2V in Fig. 9) and is lower than the standard voltage value (such as 3V) of low level signal, then by low level signal voltage
Low flag bit is set as effective status；
If the waveform of communication signal during low level signal (such as during the t1-t2 in Fig. 9), preceding half period it is low
The average voltage (such as being 2.4V in Fig. 9) of level signal is greater than the average voltage of the low level signal of second half of the cycle
(such as being 1.3V in Fig. 9), and the average voltage (1.3V) of the low level signal of second half of the cycle is low with preceding half period
The ratio (1.3V/2.4V=0.54) of the average voltage (2.4V) of level signal is less than setting average voltage fractional threshold
(such as 0.7) then sets effective status for low level signal voltage attenuation flag bit；
If the low flag bit of high level signal voltage, high level signal voltage attenuation flag bit, the low mark of low level signal voltage
Will position and low level signal voltage attenuation flag bit are effective status, then set electric slip ring communication short-circuit condition flag bit to
Effective status；
If it is effective status that electric slip ring, which communicates short-circuit condition flag bit, the distance S1 of fault point distance test point is calculated；
Wherein, the distance S1 calculating process of fault point distance test point is as follows: the effective time (t3- before being decayed according to high level signal
T2=0.07 μ s) and the communication signal transmission speed (such as 4.2nm/s) in bus at the scene, calculate fault point distance test point
Distance S1 (S1=0.07 μ s*4.2nm/s/2=8.3m).
If the difference of the distance S0 (8m) of the distance S1 (8.3m) and electric slip ring of fault point distance test point apart from test point
(S1-S0=0.3m) it is less than set distance threshold value (such as 0.5m), it is determined that the communication of the communication channel or electric slip ring of electric slip ring
There is " short circuit " failure in wiring.
3) " rate of decay is excessive " failure
The assessment of electric slip ring communication quality and fault diagnosis are effective by assessing the waveform voltage of electric slip ring communication signal
Value come what is completed, is completed by the rate of decay for assessing the waveform voltage virtual value of electric slip ring communication signal
's.Its fieldbus substation assessed is usually fieldbus by electric slip ring and detects nearest substation, example apart from electric slip ring
Such as the wheel hub internal bus substation 1 in Fig. 3.
Waveform voltage virtual value unit is V, calculation method are as follows: in one cycle, waveform voltage virtual value=height electricity
The sum of the sum of ordinary mail instantaneous voltage/N1+ low level signal instantaneous voltage/N2.Wherein, N1 is high level in same period
Signal sampling number, N2 are low level signal sampling number in same period.
The judgment method of such failure is as follows: according to the actual value and communication signal of the waveform voltage virtual value of communication signal
Waveform voltage virtual value predicted value, determine electric slip ring with the presence or absence of failure.
Further, the waveform voltage according to the actual value of the waveform voltage virtual value of communication signal and communication signal is effective
The predicted value of value determines that electric slip ring with the presence or absence of failure, specifically includes:
Calculate the reality of the predicted value of the waveform voltage virtual value of communication signal and the waveform voltage virtual value of communication signal
The difference of value obtains predicted voltage deviation；
The ratio for calculating the predicted value of the waveform voltage virtual value of predicted voltage deviation and communication signal, obtains predicted voltage
Deviation ratio；
When predicted voltage deviation ratio is greater than setting voltage deviation rate, output voltage wear-out failure alarm signal.
Further, the waveform voltage according to the actual value of the waveform voltage virtual value of communication signal and communication signal is effective
The predicted value of value determines that electric slip ring specifically further includes the pre- of the waveform voltage virtual value of following communication signal with the presence or absence of failure
The calculating step of measured value:
According to the historical data of the actual value of the waveform voltage virtual value of communication signal, waveform voltage virtual value is calculated
Attenuation model；
According to the decaying of the historical data of the actual value of the waveform voltage virtual value of communication signal and waveform voltage virtual value
The predicted value of the waveform voltage virtual value of communication signal is calculated in model.
It is exemplified below: assuming that the waveform of collected communication signal is such as when electric slip ring fault detection means is just run
Shown in Figure 10, waveform voltage virtual value is 6.4V at this time.After electric slip ring fault detection means is run 3 months, collected communication
The waveform of signal is as shown in figure 11, and waveform voltage virtual value is 4.79V at this time.After electric slip ring fault detection means is run 4 months,
The waveform of collected communication signal is as shown in figure 12, and waveform voltage virtual value is 2.52V at this time.
To sum up, after 0 day waveform voltage effective value actual value V00=6.4V, 3 months waveform voltage effective values i.e. after 90 days
Actual value V90=4.79V, the actual value V120=2.52V of 4 months waveform voltage effective values i.e. after 120 days.
According to the historical data of the actual value of waveform voltage virtual value, V00=6.4V, V90=4.79V calculate waveform electricity
It is pressed with decay coefficient K=(Vtarget-Vinit)/(Ttarget-Tinit) of valid value, by V00=6.4V, V90=4.79V band
Enter above formula, obtain: K=(4.79V-6.4V)/(90-0)=- 0.0179.
Establish the attenuation model of fault prediction model namely waveform voltage virtual value: Ytarget=Vinit+K ×
(Ttarget-Tinit)=Vinit+ (- 0.0179) × (Ttarget-Tinit).
The historical data V90=4.79V of the actual value of waveform voltage effective value according to above-mentioned attenuation model and after 90 days, meter
Calculate predicted value Y120=4.79V+ (- 0.0179) × (120-90)=4.25V of waveform voltage effective value after obtaining 120 days.
And the actual value of waveform voltage effective value is V120=2.52V after 120 days, and predicted voltage deviation Vdif is calculated
=Y120-V120=4.25V-2.52V=1.73V.
Calculate predicted voltage deviation Vdif=1.73V and after 120 days waveform voltage effective value predicted value Y120=4.25V
Ratio, obtain predicted voltage deviation ratio=| Vdif |/Y120*100%=1.73V/4.25V=40.7%.
Predicted voltage deviation ratio=40.7% is greater than setting voltage deviation rate (such as 30%), then output voltage wear-out failure
Alarm signal.
The electric slip ring fault detection method of the embodiment of the present invention, on the fieldbus being connect using on-line checking with electric slip ring
Communication signal mode, to electric slip ring, whether failure determines, do not influence the normal work of electric slip ring, and can it is accurate,
Timely find failure, field maintenance person can get out components or spare slip ring in advance, in fixed maintenance time and
It is not fault time to remove care and maintenance slip ring in advance, to guarantee the zero failure time of electric slip ring equipment, reduces live dimension
The work difficulty of shield personnel.And can effectively reduce in wind power generating set because of the number of stoppages caused by electric slip ring, wind is improved indirectly
The quality of power generator group communication signal in fieldbus (such as Profibus) reduces wind power generating set scene indirectly
The number of bus communication failure extends wind power generating set average time between failures MTBF.
Embodiment three
Figure 13 is the structural schematic diagram of electric slip ring fault detection means one embodiment provided by the invention.The present invention is implemented
Electric slip ring fault detection method shown in embodiment one or embodiment two can be performed in the electric slip ring fault detection means of example.Such as Figure 13
Shown, the electric slip ring fault detection means of the embodiment of the present invention specifically may include acquisition module 131 and determining module 132.
Acquisition module 131, for acquiring the communication signal on the fieldbus connecting with electric slip ring.
Determining module 132, for determining electric slip ring with the presence or absence of failure according to communication signal.
Further, determining module 132 is particularly used in:
According to the voltage, waveform, and/or distortion of communication signal, determine electric slip ring with the presence or absence of failure.
Further, determining module 132 is particularly used in:
According to the voltage of communication signal with the comparison result of normal voltage, communication signal waveform compared with reference waveform
As a result, and/or the comparison result of the distortion of communication signal and standard distortion, determine electric slip ring with the presence or absence of failure.
Further, determining module 132 is particularly used in:
When the voltage of communication signal and the ratio of normal voltage are less than the first setting voltage threshold, output voltage event immediately
Hinder alarm signal；Alternatively, when the voltage of communication signal and the ratio of normal voltage are less than the second setting voltage threshold, delay the
Output voltage failure alarm signal after one setting time；And/or
When the ratio of the waveform of communication signal and reference waveform is less than the first setting waveform threshold value, output waveform event immediately
Hinder alarm signal；Alternatively, when the ratio of the waveform of communication signal and reference waveform is less than the second setting waveform threshold value, delay the
Output waveform failure alarm signal after two setting times；And/or
When the ratio of the distortion of communication signal and standard distortion is greater than the first setting distortion threshold value, the event of output distortion immediately
Hinder alarm signal；Alternatively, when the ratio of the distortion of communication signal and standard distortion is greater than the second setting distortion threshold value, delay the
Output distortion failure alarm signal after three setting times.
Further, determining module 132 is particularly used in:
According to the voltage, waveform and distortion of communication signal, the quality of communication signal is calculated；According to the quality of communication signal with
The comparison result of standard quality determines electric slip ring with the presence or absence of failure.
Further, determining module 132 is particularly used in:
When the ratio of the quality of communication signal and standard quality is less than the first setting quality threshold, quality event is exported immediately
Hinder alarm signal；Alternatively, when the ratio of the quality of communication signal and standard quality is less than the second setting quality threshold, delay the
Quality fault alarm signal is exported after four setting times.
Further, determining module 132 is particularly used in:
If the waveform of communication signal is during low level signal, there are two the first skip signals to high level direction,
And attenuation relation is presented in two the first skip signals, then sets effective status for low level signal distortion flag bit, and record
The voltage magnitude of two the first skip signals and the voltage magnitude ratio of two the first skip signals；
If the waveform of communication signal is during high level signal, there are two the second skip signals to low level direction,
And attenuation relation is presented in two the second skip signals, then sets effective status for high level signal distortion flag bit, and record
The voltage magnitude of two the second skip signals and the voltage magnitude ratio of two the second skip signals；
If low level signal distortion flag bit and high level signal distortion flag bit are effective status, and two first are jumped
Difference of the voltage magnitude of varying signal than the voltage magnitude ratio with two the second skip signals, electricity with two the first skip signals
The ratio of voltage magnitude biggish voltage magnitude ratio than in of Amplitude Ration and two the second skip signals is pressed, setting Amplitude Ration is less than
Threshold value then sets effective status for electric slip ring communication off state flag bit；
If it is effective status that electric slip ring, which communicates off state flag bit, the distance of fault point distance test point is calculated；
If the difference of the distance of the distance and electric slip ring of fault point distance test point apart from test point is less than set distance threshold
Value, it is determined that the brush contact of electric slip ring is bad or open circuit fault occurs in the communication channel of electric slip ring.
Further, determining module 132 is particularly used in:
According to the transmission speed in the period of first the first skip signal and communication signal at the scene bus, failure is calculated
Distance of the point apart from test point.
Further, determining module 132 is particularly used in:
If the waveform of communication signal, during high level signal, the average voltage of high level signal is lower than high level signal
Standard voltage value, then set effective status for the low flag bit of high level signal voltage；
If the waveform of communication signal, during high level signal, the average voltage of the high level signal of preceding half period is big
In the average voltage of the high level signal of second half of the cycle, and the average voltage of the high level signal of second half of the cycle is with before
The ratio of the average voltage of the high level signal of half period is less than setting average voltage fractional threshold, then by high level
Signal voltage decaying flag bit is set as effective status；
If the waveform of communication signal, during low level signal, the average voltage of low level signal is lower than low level signal
Standard voltage value, then set effective status for the low flag bit of low level signal voltage；
If the waveform of communication signal, during low level signal, the average voltage of the low level signal of preceding half period is big
In the average voltage of the low level signal of second half of the cycle, and the average voltage of the low level signal of second half of the cycle is with before
The ratio of the average voltage of the low level signal of half period is less than setting average voltage fractional threshold, then by low level
Signal voltage decaying flag bit is set as effective status；
If the low flag bit of high level signal voltage, high level signal voltage attenuation flag bit, the low mark of low level signal voltage
Will position and low level signal voltage attenuation flag bit are effective status, then set electric slip ring communication short-circuit condition flag bit to
Effective status；
If it is effective status that electric slip ring, which communicates short-circuit condition flag bit, the distance of fault point distance test point is calculated；
If the difference of the distance of the distance and electric slip ring of fault point distance test point apart from test point is less than set distance threshold
Value, it is determined that short trouble occur in the communication channel of electric slip ring or the communications line of electric slip ring.
Further, determining module 132 is particularly used in:
Effective time and communication signal before being decayed according to the high level signal transmission speed in bus at the scene, calculate therefore
Distance of the barrier point apart from test point.
Further, determining module 132 is particularly used in:
According to the prediction of the actual value of the waveform voltage virtual value of communication signal and the waveform voltage virtual value of communication signal
Value determines electric slip ring with the presence or absence of failure.
Further, determining module 132 is particularly used in:
Calculate the reality of the predicted value of the waveform voltage virtual value of communication signal and the waveform voltage virtual value of communication signal
The difference of value obtains predicted voltage deviation；
The ratio for calculating the predicted value of the waveform voltage virtual value of predicted voltage deviation and communication signal, obtains predicted voltage
Deviation ratio；
When predicted voltage deviation ratio is greater than setting voltage deviation rate, output voltage wear-out failure alarm signal.
Further, determining module 132 is particularly used in:
According to the historical data of the actual value of the waveform voltage virtual value of communication signal, waveform voltage virtual value is calculated
Attenuation model；
According to the decaying of the historical data of the actual value of the waveform voltage virtual value of communication signal and waveform voltage virtual value
The predicted value of the waveform voltage virtual value of communication signal is calculated in model.
The electric slip ring fault detection means of the embodiment of the present invention, on the fieldbus being connect using on-line checking with electric slip ring
Communication signal mode, to electric slip ring, whether failure determines, do not influence the normal work of electric slip ring, and can it is accurate,
Timely find failure, field maintenance person can get out components or spare slip ring in advance, in fixed maintenance time and
It is not fault time to remove care and maintenance slip ring in advance, to guarantee the zero failure time of electric slip ring equipment, reduces live dimension
The work difficulty of shield personnel.And can effectively reduce in wind power generating set because of the number of stoppages caused by electric slip ring, wind is improved indirectly
The quality of power generator group communication signal in fieldbus (such as Profibus) reduces wind power generating set scene indirectly
The number of bus communication failure extends wind power generating set average time between failures MTBF.
Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the present invention., rather than its limitations；To the greatest extent
Pipe present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that: its according to
So be possible to modify the technical solutions described in the foregoing embodiments, or to some or all of the technical features into
Row equivalent replacement；And these are modified or replaceed, various embodiments of the present invention technology that it does not separate the essence of the corresponding technical solution
The range of scheme.
Claims (17)
1. a kind of electric slip ring fault detection method characterized by comprising
Acquire the communication signal on the fieldbus connecting with electric slip ring；
Determine the electric slip ring with the presence or absence of failure according to the communication signal.
2. electric slip ring fault detection method according to claim 1, which is characterized in that described true according to the communication signal
Determining the electric slip ring with the presence or absence of failure includes:
According to the voltage, waveform, and/or distortion of the communication signal, determine the electric slip ring with the presence or absence of failure.
3. electric slip ring fault detection method according to claim 2, which is characterized in that described according to the communication signal
Voltage, waveform, and/or distortion determine the electric slip ring with the presence or absence of failure, comprising:
According to the voltage of the communication signal and the comparison result of normal voltage, the waveform of the communication signal and reference waveform
The comparison result of the distortion of comparison result, and/or the communication signal and standard distortion determines the electric slip ring with the presence or absence of event
Barrier.
4. electric slip ring fault detection method according to claim 2, which is characterized in that described according to the communication signal
Voltage, waveform, and/or distortion determine the electric slip ring with the presence or absence of failure, comprising:
According to the voltage, waveform and distortion of the communication signal, the quality of the communication signal is calculated；
According to the comparison result of the quality of the communication signal and standard quality, determine the electric slip ring with the presence or absence of failure.
5. electric slip ring fault detection method according to claim 2, which is characterized in that described according to the communication signal
Voltage, waveform, and/or distortion determine the electric slip ring with the presence or absence of failure, comprising:
If the waveform of the communication signal is during low level signal, there are two the first skip signals to high level direction,
And attenuation relation is presented in described two first skip signals, then sets effective status for low level signal distortion flag bit, and
Record the voltage magnitude of described two first skip signals and the voltage magnitude ratio of described two first skip signals；
If the waveform of the communication signal is during high level signal, there are two the second skip signals to low level direction,
And attenuation relation is presented in described two second skip signals, then sets effective status for high level signal distortion flag bit, and
Record the voltage magnitude of described two second skip signals and the voltage magnitude ratio of described two second skip signals；
If low level signal distortion flag bit and high level signal distortion flag bit are effective status, and described two
The voltage magnitude of a first skip signal than the voltage magnitude ratio with described two second skip signals difference, and it is described two
The voltage magnitude of first skip signal is than voltage magnitude ratio biggish in the voltage magnitude ratio with described two second skip signals
Ratio, be less than setting Amplitude Ration threshold value, then by electric slip ring communication off state flag bit be set as effective status；
If the electric slip ring communication off state flag bit is effective status, the distance of fault point distance test point is calculated；
It is set if the difference of distance of the distance of the fault point distance test point with the electric slip ring apart from the test point is less than
Set a distance threshold value, it is determined that the brush contact of the electric slip ring is bad or open circuit fault occurs in the communication channel of the electric slip ring.
6. electric slip ring fault detection method according to claim 5, which is characterized in that the calculating fault point distance detection
The distance of point, comprising:
According to the transmission speed of the period and the communication signal of first first skip signal in the fieldbus,
Calculate the distance of test point described in the fault point distance.
7. electric slip ring fault detection method according to claim 2, which is characterized in that described according to the communication signal
Voltage, waveform, and/or distortion determine the electric slip ring with the presence or absence of failure, comprising:
If the waveform of the communication signal, during high level signal, the average voltage of high level signal is lower than high level signal
Standard voltage value, then set effective status for the low flag bit of high level signal voltage；
If the waveform of the communication signal, during high level signal, the average voltage of the high level signal of preceding half period is big
In the average voltage of the high level signal of second half of the cycle, and the average voltage of the high level signal of the second half of the cycle
With the ratio of the average voltage of the high level signal of the preceding half period, it is less than setting average voltage fractional threshold, then
Effective status is set by high level signal voltage attenuation flag bit；
If the waveform of the communication signal, during low level signal, the average voltage of low level signal is lower than low level signal
Standard voltage value, then set effective status for the low flag bit of low level signal voltage；
If the waveform of the communication signal, during low level signal, the average voltage of the low level signal of preceding half period is big
In the average voltage of the low level signal of second half of the cycle, and the average voltage of the low level signal of the second half of the cycle
With the ratio of the average voltage of the low level signal of the preceding half period, it is less than the setting average voltage ratio threshold
Value, then set effective status for low level signal voltage attenuation flag bit；
If the low flag bit of the high level signal voltage, the high level signal voltage attenuation flag bit, the low level signal
The low flag bit of voltage and the low level signal voltage attenuation flag bit are effective status, then electric slip ring are communicated short-circuit condition
Flag bit is set as effective status；
If the electric slip ring communication short-circuit condition flag bit is effective status, the distance of fault point distance test point is calculated；
It is set if the difference of distance of the distance of the fault point distance test point with the electric slip ring apart from the test point is less than
Set a distance threshold value, it is determined that short trouble occurs in the communications line of the communication channel of the electric slip ring or the electric slip ring.
8. electric slip ring fault detection method according to claim 7, which is characterized in that the calculating fault point distance detection
The distance of point, comprising:
The transmission speed of effective time and the communication signal in the fieldbus before being decayed according to high level signal, meter
Calculate the distance of test point described in the fault point distance.
9. electric slip ring fault detection method according to claim 2, which is characterized in that described according to the communication signal
Voltage, waveform, and/or distortion determine the electric slip ring with the presence or absence of failure, comprising:
According to the waveform voltage virtual value of the actual value of the waveform voltage virtual value of the communication signal and the communication signal
Predicted value determines the electric slip ring with the presence or absence of failure.
10. electric slip ring fault detection method according to claim 9, which is characterized in that described according to the communication signal
Waveform voltage virtual value actual value and the communication signal waveform voltage virtual value predicted value, determine the electric slip ring
With the presence or absence of failure, comprising:
Calculate the predicted value of the waveform voltage virtual value of the communication signal and the waveform voltage virtual value of the communication signal
The difference of actual value obtains predicted voltage deviation；
The ratio for calculating the predicted value of the waveform voltage virtual value of the predicted voltage deviation and the communication signal, is predicted
Voltage deviation rate；
When the predicted voltage deviation ratio is greater than setting voltage deviation rate, output voltage wear-out failure alarm signal.
11. electric slip ring fault detection method according to claim 10, which is characterized in that described according to the communication signal
Waveform voltage virtual value actual value and the communication signal waveform voltage virtual value predicted value, determine the electric slip ring
With the presence or absence of failure, further includes:
According to the historical data of the actual value of the waveform voltage virtual value of the communication signal, waveform voltage virtual value is calculated
Attenuation model；
According to the historical data of the actual value of the waveform voltage virtual value of the communication signal and the waveform voltage virtual value
The predicted value of the waveform voltage virtual value of the communication signal is calculated in attenuation model.
12. a kind of electric slip ring fault detection means characterized by comprising
Acquisition module, for acquiring the communication signal on the fieldbus connecting with electric slip ring；
Determining module, for determining the electric slip ring with the presence or absence of failure according to the communication signal.
13. electric slip ring fault detection means according to claim 12, which is characterized in that the determining module is specifically used
In: according to the voltage of the communication signal and the comparison result of normal voltage, the waveform of the communication signal and reference waveform
The comparison result of the distortion of comparison result, and/or the communication signal and standard distortion determines the electric slip ring with the presence or absence of event
Barrier；Alternatively,
The determining module is specifically used for:
According to the voltage, waveform and distortion of the communication signal, the quality of the communication signal is calculated；
According to the comparison result of the quality of the communication signal and standard quality, determine the electric slip ring with the presence or absence of failure.
14. electric slip ring fault detection means according to claim 12, which is characterized in that the determining module is specifically used
In:
If the waveform of the communication signal is during low level signal, there are two the first skip signals to high level direction,
And attenuation relation is presented in described two first skip signals, then sets effective status for low level signal distortion flag bit, and
Record the voltage magnitude of described two first skip signals and the voltage magnitude ratio of described two first skip signals；
If the waveform of the communication signal is during high level signal, there are two the second skip signals to low level direction,
And attenuation relation is presented in described two second skip signals, then sets effective status for high level signal distortion flag bit, and
Record the voltage magnitude of described two second skip signals and the voltage magnitude ratio of described two second skip signals；
If low level signal distortion flag bit and high level signal distortion flag bit are effective status, and described two
The voltage magnitude of a first skip signal than the voltage magnitude ratio with described two second skip signals difference, and it is described two
The voltage magnitude of first skip signal is than voltage magnitude ratio biggish in the voltage magnitude ratio with described two second skip signals
Ratio, be less than setting Amplitude Ration threshold value, then by electric slip ring communication off state flag bit be set as effective status；
If the electric slip ring communication off state flag bit is effective status, the distance of fault point distance test point is calculated；
It is set if the difference of distance of the distance of the fault point distance test point with the electric slip ring apart from the test point is less than
Set a distance threshold value, it is determined that the brush contact of the electric slip ring is bad or open circuit fault occurs in the communication channel of the electric slip ring.
15. electric slip ring fault detection means according to claim 12, which is characterized in that the determining module is specifically used
In:
If the waveform of the communication signal, during high level signal, the average voltage of high level signal is lower than high level signal
Standard voltage value, then set effective status for the low flag bit of high level signal voltage；
If the waveform of the communication signal, during high level signal, the average voltage of the high level signal of preceding half period is big
In the average voltage of the high level signal of second half of the cycle, and the average voltage of the high level signal of the second half of the cycle
With the ratio of the average voltage of the high level signal of the preceding half period, it is less than setting average voltage fractional threshold, then
Effective status is set by high level signal voltage attenuation flag bit；
If the waveform of the communication signal, during low level signal, the average voltage of low level signal is lower than low level signal
Standard voltage value, then set effective status for the low flag bit of low level signal voltage；
If the waveform of the communication signal, during low level signal, the average voltage of the low level signal of preceding half period is big
In the average voltage of the low level signal of second half of the cycle, and the average voltage of the low level signal of the second half of the cycle
With the ratio of the average voltage of the low level signal of the preceding half period, it is less than the setting average voltage ratio threshold
Value, then set effective status for low level signal voltage attenuation flag bit；
If the low flag bit of the high level signal voltage, the high level signal voltage attenuation flag bit, the low level signal
The low flag bit of voltage and the low level signal voltage attenuation flag bit are effective status, then electric slip ring are communicated short-circuit condition
Flag bit is set as effective status；
If the electric slip ring communication short-circuit condition flag bit is effective status, the distance of fault point distance test point is calculated；
It is set if the difference of distance of the distance of the fault point distance test point with the electric slip ring apart from the test point is less than
Set a distance threshold value, it is determined that short trouble occurs in the communications line of the communication channel of the electric slip ring or the electric slip ring.
16. electric slip ring fault detection means according to claim 12, which is characterized in that the determining module is specifically used
In:
Calculate the predicted value of the waveform voltage virtual value of the communication signal and the waveform voltage virtual value of the communication signal
The difference of actual value obtains predicted voltage deviation；
The ratio for calculating the predicted value of the waveform voltage virtual value of the predicted voltage deviation and the communication signal, is predicted
Voltage deviation rate；
When the predicted voltage deviation ratio is greater than setting voltage deviation rate, output voltage wear-out failure alarm signal.
17. electric slip ring fault detection means according to claim 16, which is characterized in that the determining module is also used to:
According to the historical data of the actual value of the waveform voltage virtual value of the communication signal, waveform voltage virtual value is calculated
Attenuation model；
According to the historical data of the actual value of the waveform voltage virtual value of the communication signal and the waveform voltage virtual value
The predicted value of the waveform voltage virtual value of the communication signal is calculated in attenuation model.
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Address after: 830026 No. 107, Shanghai Road, Urumqi economic and Technological Development Zone, the Xinjiang Uygur Autonomous Region Patentee after: Jinfeng Technology Co.,Ltd. Address before: 830026 No. 107, Shanghai Road, Urumqi economic and Technological Development Zone, the Xinjiang Uygur Autonomous Region Patentee before: XINJIANG GOLDWIND SCIENCE & TECHNOLOGY Co.,Ltd. |