CN103217545B - Method for judging fault tolerance and abnormality of rotating speed signal of synchronous motor - Google Patents
Method for judging fault tolerance and abnormality of rotating speed signal of synchronous motor Download PDFInfo
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Abstract
The invention discloses a method for judging fault tolerance and abnormality of a rotating speed signal of a synchronous motor. Speed measuring fluted discs are mounted at one or more positions of a main shaft of the synchronous motor; after the motor is started, the fluted discs rotate along with the main shaft; one or more speed measuring sensors fixed on disc faces generate periodic waveform electric signals under the action of electromagnetic induction; after the device receives the rotating speed signal, the device processes the rotating speed signal according to the following steps of: carrying out high-frequency counting on each channel rotating speed signal to obtain a pulse period counting value; judging the fault tolerance and the abnormality of single channel signal; judging the fault tolerance and the abnormality of different channel signals of the same speed measuring fluted disc; judging the fault tolerance and the abnormality of two channel rotating speed signals of different speed measuring fluted discs; obtaining the mechanical rotating speed according to the rotating speed pulse counting value and obtaining electrical capacity frequency according to an electrical capacity signal of the synchronous motor; and checking the mechanical rotating speed by using the electrical capacity frequency. According to the method, the abnormality judgment and fault tolerance processing of the rotating speed signal can be accurately and reliably carried out.
Description
Technical field
The invention belongs to field of power, particularly the rotating speed of the Large Synchronous Machine equipment of the industrial enterprise such as power house, steel plant or torsional vibration signals are measured and fault-tolerance processing method.
Background technology
In electric system, the various speed probe of extensive employing obtains the tach signal of synchronous motor equipment, obtain real-time rotate speed, information such as large axial torsional vibration, merit angle etc. through follow-up hardware and software signal transacting, so for surveillance equipment running status or do further FEEDBACK CONTROL.Just seem very important to the Measurement accuracy of tach signal, if signal distortion or fault-tolerant processing defectiveness, can cause the malfunction behavior of protection or opertaing device, and then cause operation exception or the damage of motor device, consequence is very serious.In order to improve measuring accuracy and reliability, usually various process is done to velocity-measuring system, as improved the machining accuracy of velocity-measuring system, system mask isolation, signal interference protection measure etc.Sometimes, in order in anticipation in particular cases, as holes probe damages or dead electricity, also can obtain tach signal incessantly, velocity-measuring system adopts redundant configuration.Now, device can receive two-way or multichannel tach signal, comparatively simple to the process of multichannel tach signal at present, only has a small amount of fault-tolerant measure.For the occasion that the reliability requirement of tachometric survey is higher, need fault-tolerant processing and anomalous discrimination more accurately and reliably.
Summary of the invention
Object of the present invention, be to provide the method for the fault-tolerant and anomalous discrimination of a kind of synchronous motor tach signal, it accurately and reliably can carry out tach signal anomalous discrimination and fault-tolerant processing.
In order to reach above-mentioned purpose, solution of the present invention is:
The method of the fault-tolerant and anomalous discrimination of a kind of synchronous motor tach signal, in one or more positions of synchronous motor macro-axis, speed measuring fluted disc is installed, after electric motor starting, fluted disc rotates with macro-axis, the single or multiple tachogenerators be fixed on above card produce the electric signal in periodic waveform under electromagnetic induction effect, after device receives tach signal, process according to the following steps:
(1) recurrence interval count value is obtained to each passage tach signal high-frequency count;
(2) the fault-tolerant and anomalous discrimination of single channel signal;
(3) the fault-tolerant and anomalous discrimination of the different channel signals of same speed measuring fluted disc;
(4) the fault-tolerant and anomalous discrimination of two passage tach signals of different speed measuring fluted disc;
(5) obtain mechanical separator speed by tacho-pulse count value, obtain electric parameters frequency by synchronous motor electric parameters signal;
(6) with electric parameters frequency verification mechanical separator speed.
The particular content of above-mentioned steps (1) is: device receives the rotational speed pulse signal of multiple passages of synchronous motor fluted disc speed measuring sensor, obtains through shaping amplification, high-frequency count the recurrence interval count value T that each passage corresponds to current rotating speed
1,1(n), T
1,2(n) ..., T
1, k(n), T
2,1(n), T
2,2(n) ..., T
2, k(n) ..., wherein, first subscript represents speed probe place fluted disc sequence number, and second subscript represents speed probe probe sequence number on same fluted disc.
The particular content of above-mentioned steps (2) is: by this count value T of the i-th passage
m,i(n) and previous count value T
m,i(n-1) compare, if meet:
| T
m,i(n)-T
m,i(n-1) | >T
m,i(n-1)/K
1.setformula 1.
Then abandon this count value T
m,in (), by T
m,i(n-1) T is assigned to
m,i(n);
Formula 1. in, K
1.setfor definite value, get 10 ~ 40;
If this suddenlys change, the times N occurred within the t time meets:
Then think that tach signal is abnormal;
Formula 2. in, C
setget 0.5 ~ 1,
for the current mean speed of synchronous motor, unit: rpm.
The particular content of above-mentioned steps (3) is: by the i-th channel counts value T of m installed position speed measuring fluted disc
m,i(n) and (i+1) channel counts value T
m, i+1n () compares, if meet:
| T
m, i+1(n)-T
m,i(n) | > (T
m, i+1(n)+T
m,i(n))/K
2.setformula 3.
Then for correct signal, its count value is assigned to another one passage, and if this difference continues T with comparatively subtotal numerical value passage
1.set, then think that tach signal is abnormal;
Formula 3. in, K
2.setfor definite value, get 10 ~ 40; T
1.setget 0.1 ~ 0.5s;
Then two channel counts values after fault-tolerant processing are the synthesis velocity gauge numerical value T on average obtaining this m installed position
m(n):
T
m(n)=(T
m,i(n)+T
m,i+1(n))/2。
The particular content of above-mentioned steps (4) is: the synthesis velocity gauge numerical value T getting j and k installed position speed measuring fluted disc
j(n) and T
kn () compares, if meet:
| T
j(n)-T
k(n) | > (T
j(n)+T
k(n))/K
3.setformula 4.
And this difference continues to occur T
2.set, then think the two one of channel abnormal, next use electric parameters frequency to verify the two;
Formula 4. in, K
3.setfor definite value, get 10 ~ 40; T
2.setget 0.1 ~ 0.5s.
The particular content of above-mentioned steps (5) is: by the synthesis velocity gauge numerical value T of certain speed measuring fluted disc l installed position
ln (), calculates the mechanical separator speed n of motor in conjunction with velocity-measuring system parameter:
Formula 5. in, f
cfor device counter frequency, M is the speed measuring fluted disc number of teeth, and the unit of mechanical separator speed n is rpm;
Device is sampled to synchronous motor voltage transformer secondary side voltage, obtains three-phase voltage U
a, U
b, U
c, use Frequency Measurement Algorithm to obtain the electric parameters frequency f of electric rotating machine, unit: Hz.
The particular content of above-mentioned steps (6) is: verify mechanical separator speed n by electric parameters frequency f, if meet:
| np-60f|>K
4.setformula 6.
If this difference continues T
3.set, then this channel abnormal is thought;
Formula 6. in, K
4.setfor definite value, getting 240 ~ 420, p is synchronous motor number of pole-pairs, T
3.setget 0.5 ~ 1s.
After adopting such scheme, the present invention is by the mutual school to the count value of multiple passage that tests the speed, and the comparison of mechanical separator speed and electric parameters frequency, can position tach signal abnormal passage and identify exactly, and carry out corresponding fault-tolerant processing, improve accuracy and the reliability of tachometric survey.
Accompanying drawing explanation
Fig. 1 is process flow diagram of the present invention;
Fig. 2 is certain power plant's fluted disc speed measuring system layout schematic diagram;
Fig. 3 adopts the recurrence interval counting schematic diagram along the high-frequency counter triggered.
Embodiment
As shown in Figure 1, the invention provides the method for the fault-tolerant and anomalous discrimination of a kind of synchronous motor tach signal, first in one or more positions of synchronous motor macro-axis, speed measuring fluted disc is installed, after electric motor starting, fluted disc rotates with macro-axis, the single or multiple tachogenerators be fixed on above card produce the electric signal in periodic waveform under electromagnetic induction effect, and its cycle constantly changes with current rotating speed.After device receives tach signal, processing procedure is as follows:
(1) device receives the rotational speed pulse signal of multiple passages of synchronous motor fluted disc speed measuring sensor, obtains through shaping amplification, high-frequency count the recurrence interval count value T that each passage corresponds to current rotating speed
1,1(n), T
1,2(n) ..., T
1, k(n), T
2,1(n), T
2,2(n) ..., T
2, k(n) ..., wherein, first subscript represents speed probe place fluted disc sequence number, and second subscript represents speed probe probe sequence number on same fluted disc;
(2) because the rotating speed of motor device is continually varying, concerning each road tach signal, the count value that front and back are twice does not have large sudden change, by this count value T of the i-th passage
m,i(n) and previous count value T
m,i(n-1) compare, if meet:
| T
m,i(n)-T
m,i(n-1) | >T
m,i(n-1)/K
1.setformula 1.
Then abandon this count value T
m,in (), by T
m,i(n-1) T is assigned to
m,i(n).
Formula 1. in, K
1.setfor definite value, get 10 ~ 40.
If this suddenlys change, the times N occurred within the t time meets:
Then think that tach signal is abnormal.
Formula 2. in, C
setget 0.5 ~ 1,
for the current mean speed of synchronous motor (unit rpm).
(3) any two of same speed measuring fluted disc test the speed passage recurrence interval count value in the same time should be substantially equal.By the i-th channel counts value T of m installed position speed measuring fluted disc
m,i(n) and (i+1) channel counts value T
m, i+1n () compares, if meet:
| T
m, i+1(n)-T
m,i(n) | > (T
m, i+1(n)+T
m,i(n))/K
2.setformula 3.
Then with comparatively subtotal numerical value passage for correct signal (such as: if T
m,i(n) <T
m, i+1n (), then by T
m,in () is assigned to T
m, i+1(n)), and if this difference continues T
1.set(T
1.setget 0.1 ~ 0.5s), then think that tach signal is abnormal.
Formula 3. in, K
2.setfor definite value, get 10 ~ 40.
Then two channel counts values are the synthesis velocity gauge numerical value T on average obtaining this m installed position
m(n):
T
m(n)=(T
m,i(n)+T
m,i+1(n))/2
(4) any two of different speed measuring fluted disc test the speed passage recurrence interval count value in the same time should be comparatively close, gets the synthesis velocity gauge numerical value T of j and k installed position speed measuring fluted disc
j(n) and T
kn () compares, if meet:
| T
j(n)-T
k(n) | > (T
j(n)+T
k(n))/K
3.setformula 4.
And this difference continues to occur T
2.set(T
2.setget 0.1 ~ 0.5s), then think the two one of channel abnormal, next use electric parameters frequency to verify the two.
Formula 4. in, K
3.setfor definite value, get 10 ~ 40.
(5) by the synthesis velocity gauge numerical value T of certain speed measuring fluted disc l installed position
ln (), calculates the mechanical separator speed n(unit rpm of motor in conjunction with velocity-measuring system parameter):
Formula 5. in, f
cfor device counter frequency, M is the speed measuring fluted disc number of teeth.
Device is sampled to synchronous motor voltage transformer secondary side voltage, obtains three-phase voltage U
a, U
b, U
c, use Frequency Measurement Algorithm to obtain the electric parameters frequency f (unit Hz) of electric rotating machine;
(6) mechanical separator speed n is verified by electric parameters frequency f, if meet:
| np-60f|>K
4.setformula 6.
If this difference continues T
3.set(T
3.setget 0.5 ~ 1s), then think this channel abnormal.
Formula 6. in, K
4.setfor definite value, getting 240 ~ 420, p is synchronous motor number of pole-pairs.
Below with reference to accompanying drawing, the velocity-measuring system installed for certain domestic 600MW fired power generating unit, illustrates the specific embodiment of the present invention.
Whole velocity-measuring system arrangenent diagram as shown in Figure 2.This unit rated speed is 3000rpm, macro-axis vapour end (high pressure cylinder side) and encourage end (exciter side) and be separately installed with a speed measuring fluted disc, Teeth Number is respectively 134 and 86, and each speed measuring fluted disc being provided with two tachogenerators, the rotational speed pulse signal of output delivers to device through secondary cable.The three-phase voltage signal of machine potential transformer also delivers to device.
By the signal processing shown in Fig. 1, it is as follows to decompose each step:
(1) as shown in Figure 3, device is to count along the rotational speed pulse signal of triggering mode to each passage, and count frequency is 20MHz, obtains corresponding to not count value sequence in the same time.Count value sequence as macro-axis vapour end place speed measuring fluted disc the 1st passage that tests the speed is T
1,1(1), T
1,1(2) ..., T
1,1n (), the count value sequence of the 2nd passage that tests the speed is T
1,2(1), T
1,2(2) ..., T
1,2(n).The count value sequence that macro-axis encourages end place speed measuring fluted disc the 1st passage that tests the speed is T
2,1(1), T
2,1(2) ..., T
2,1n (), the count value sequence of the 2nd passage that tests the speed is T
2,2(1), T
2,2(2) ..., T
2,2(n);
(2) School Affairs carries out to the current count value of each passage that tests the speed fault-tolerant.Current count value as the 1st passage that tests the speed in macro-axis vapour end place is T
1,1(n), if meet:
|T
1,1(n)-T
1,1(n-1)|>T
1,1(n-1)/K
1.set
Then think that this count value is abnormal, give up this value, by T
1,1(n-1) assignment is to T
1,1(n).If this sudden change occurs more than 8 times within the 0.2s time, then think that tach signal is abnormal.
Wherein, K
1.setget 10 ~ 40, get 16 herein.
It is identical that other passage that tests the speed deals with passage therewith.
(3) to vapour end or encourage the test the speed count value of passage of end place difference and carry out mutual school and fault-tolerant.As compared the 1st, vapour end place and the 2nd the passage current count value that tests the speed, if meet:
|T
1,2(n)-T
1,1(n)|>(T
1,2(n)+T
1,1(n))/K
2.set
Then with comparatively subtotal numerical value passage for correct signal (such as: if T
1,1(n) <T
1,2n (), then by T
1,1n () is assigned to T
1,2(n)), and if this difference continues 0.2s, then think that tach signal is abnormal.
Wherein, K
2.setget 10 ~ 40, get 16 herein.
Then two channel counts values are the synthesis velocity gauge numerical value T on average obtaining this installed position
1(n):
T
1(n)=(T
1,1(n)+T
1,2(n))/2
The two-way speed control channel of encouraging end place processes like this, can obtain synthesis rotating speed T
2(n).
(4) mutual school is carried out to vapour end and the synthesis velocity gauge numerical value of encouraging end place, if meet:
|T
1(n)-T
2(n)|>(T
1(n)+T
2(n))/K
3.set
If this difference continues 0.2s occurs, then think that the two places result that tests the speed must have a place abnormal.Following use electric parameters frequency verifies the two.
Wherein, K
3.setget 10 ~ 40, get 16 herein.
(5) by vapour end with encourage end and synthesize velocity gauge numerical value T
1(n) and T
2n (), calculates mechanical separator speed n in conjunction with velocity-measuring system parameter respectively by following formula
1and n
2:
Wherein, f
cfor device counter frequency, be 20MHz, M herein
1for the vapour end place speed measuring fluted disc number of teeth, be 134 herein.M
2for encouraging the end place speed measuring fluted disc number of teeth, be 86 herein.
(6) device is sampled to the voltage transformer secondary side voltage that synchronous motor is installed, and obtains three-phase voltage U
a, U
b, U
c, use Frequency Measurement Algorithm obtain synchronous motor electric parameters frequency f (see " and Li Yiquan, what Pentium. a kind of high-precision frequency measurement method based on fourier algorithm [J]. Proceedings of the CSEE .200626 (2) .78-81 ").
By mechanical separator speed n
1, n
2compare with electric parameters frequency f, if meet:
|n·p-60·f|=|n-60·f|>K
4.set
If this difference continues 0.5s, then think this channel abnormal.
Wherein, K
4.setget 240 ~ 420, getting 240, p is herein synchronous motor number of pole-pairs, gets 1 herein.
Adopt said method, the abnormal passage that tests the speed can be determined accurately, and carry out corresponding fault-tolerant processing, improve accuracy and the reliability of tachometric survey.The inventive method is simple, is convenient to realize.
Above embodiment is only and technological thought of the present invention is described, can not limit protection scope of the present invention with this, and every technological thought proposed according to the present invention, any change that technical scheme basis is done, all falls within scope.
Claims (3)
1. the method for the fault-tolerant and anomalous discrimination of a synchronous motor tach signal, in multiple positions of synchronous motor macro-axis, speed measuring fluted disc is installed, after electric motor starting, fluted disc rotates with macro-axis, and the multiple tachogenerators be fixed on above card produce the electric signal in periodic waveform under electromagnetic induction effect; It is characterized in that: after device receives tach signal, process according to the following steps:
(1) recurrence interval count value is obtained to each passage tach signal high-frequency count;
The particular content of described step (1) is: device receives the rotational speed pulse signal of multiple passages of synchronous motor fluted disc speed measuring sensor, obtains through shaping amplification, high-frequency count the recurrence interval count value T that each passage corresponds to current rotating speed
1,1(n), T
1,2(n) ..., T
1, k(n), T
2,1(n), T
2,2(n) ..., T
2, k(n) ..., wherein, first subscript represents tachogenerator place fluted disc sequence number, and second subscript represents tachogenerator probe sequence number on same fluted disc;
(2) the fault-tolerant and anomalous discrimination of single channel signal;
The particular content of described step (2) is: by this count value T of the i-th passage
m,i(n) and previous count value T
m,i(n-1) compare, if meet:
| T
m,i(n)-T
m,i(n-1) | >T
m,i(n-1)/K
1.setformula 1.
Then abandon this count value T
m,in (), by T
m,i(n-1) T is assigned to
m,i(n);
Formula 1. in, K
1.setfor definite value, get 10 ~ 40;
If this suddenlys change, the times N occurred within the t time meets:
formula 2.
Then think that tach signal is abnormal;
Formula 2. in, C
setget 0.5 ~ 1,
for the current mean speed of synchronous motor, unit: rpm;
(3) the fault-tolerant and anomalous discrimination of the different channel signals of same speed measuring fluted disc;
The particular content of described step (3) is: by the i-th channel counts value T of m installed position speed measuring fluted disc
m,i(n) and the i-th+1 channel counts value T
m, i+1n () compares, if meet:
| T
m, i+1(n)-T
m,i(n) | > (T
m, i+1(n)+T
m,i(n))/K
2.setformula 3.
Then for correct signal, its count value is assigned to another one passage, and if this difference continues T with comparatively subtotal numerical value passage
1.set, then think that tach signal is abnormal;
Formula 3. in, K
2.setfor definite value, get 10 ~ 40; T
1.setget 0.1 ~ 0.5s;
Then two channel counts values after fault-tolerant processing are the synthesis velocity gauge numerical value T on average obtaining this m installed position
m(n):
T
m(n)＝(T
m,i(n)+T
m,i+1(n))/2；
(4) the synthesis velocity gauge numerical value contrast verification of different speed measuring fluted disc;
The particular content of described step (4) is: the synthesis velocity gauge numerical value T getting j and k installed position speed measuring fluted disc
j(n) and T
kn () compares, if meet:
| T
j(n)-T
k(n) | > (T
j(n)+T
k(n))/K
3.setformula 4.
And this difference continues to occur T
2.set, then think that one of them synthesis velocity gauge numerical value is wrong, and then think that the two paths tach signal being used for calculating this mistake synthesis velocity gauge numerical value in step (3) is all abnormal, next use electric parameters frequency to verify the two;
Formula 4. in, K
3.setfor definite value, get 10 ~ 40; T
2.setget 0.1 ~ 0.5s;
(5) obtain mechanical separator speed by synthesis rotational speed counting value, obtain electric parameters frequency by synchronous motor electric parameters signal;
(6) with electric parameters frequency verification mechanical separator speed.
2. the method for the fault-tolerant and anomalous discrimination of synchronous motor tach signal as claimed in claim 1, is characterized in that: the particular content of described step (5) is: by the synthesis velocity gauge numerical value T of certain speed measuring fluted disc l installed position
ln (), calculates the mechanical separator speed n of motor in conjunction with velocity-measuring system parameter:
Formula 5. in, f
cfor device counter frequency, M is the speed measuring fluted disc number of teeth, and the unit of mechanical separator speed n is rpm;
Device is sampled to synchronous motor voltage transformer secondary side voltage, obtains three-phase voltage U
a, U
b, U
c, use Frequency Measurement Algorithm to obtain the electric parameters frequency f of electric rotating machine, unit: Hz.
3. the method for the fault-tolerant and anomalous discrimination of synchronous motor tach signal as claimed in claim 2, is characterized in that: the particular content of described step (6) is: verify mechanical separator speed n with electric parameters frequency f, if satisfied:
| np-60f|>K
4.setformula 6.
If this difference continues T
3.set, then described synthesis velocity gauge numerical value T is thought
ln () is wrong, and then think that the two paths tach signal calculating this synthesis velocity gauge numerical value of generation is all abnormal;
Formula 6. in, K
4.setfor definite value, getting 240 ~ 420, p is synchronous motor number of pole-pairs, T
3.setget 0.5 ~ 1s.
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| US10106134B2 (en) | 2013-09-06 | 2018-10-23 | Continental Teves Ag & Co. Ohg | Error transmission in two-level rotational speed sensor |
| CN105203793A (en) * | 2015-09-21 | 2015-12-30 | 杭州比孚科技有限公司 | Method for accurately measuring rotation speed of gear |
| CN105628955B (en) * | 2015-12-25 | 2018-10-30 | 南京南瑞集团公司 | A kind of speed measuring device and its speed-measuring method of pump-storage generator static frequency changer |
| CN111007281B (en) * | 2019-12-27 | 2020-11-17 | 华中科技大学 | Method and system for diagnosing faults of rotating speed sensor based on wavelet function correlation |
| US11236718B1 (en) * | 2020-10-30 | 2022-02-01 | GM Global Technology Operations LLC | Control of pre-engaged pinion starter |
| CN112345786B (en) * | 2020-11-23 | 2023-06-16 | 浙江浙能技术研究院有限公司 | Reluctance type fluted disc speed measurement system and rotating speed calculation method |
| CN113655234A (en) * | 2021-08-11 | 2021-11-16 | 三一重能股份有限公司 | Speed measuring disc, rotating speed and positioning measuring system and method thereof |
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| CN102914665A (en) * | 2012-09-25 | 2013-02-06 | 上海交通大学 | Motor revolving speed measurement and fault state detection system |
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| CN102472769A (en) * | 2009-06-26 | 2012-05-23 | 三菱电机株式会社 | Sensing device |
| CN102914665A (en) * | 2012-09-25 | 2013-02-06 | 上海交通大学 | Motor revolving speed measurement and fault state detection system |
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