CN110470984A - Three-level formula starter-generator faults in rotating rectifiers on-line checking and localization method - Google Patents
Three-level formula starter-generator faults in rotating rectifiers on-line checking and localization method Download PDFInfo
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- CN110470984A CN110470984A CN201910622427.8A CN201910622427A CN110470984A CN 110470984 A CN110470984 A CN 110470984A CN 201910622427 A CN201910622427 A CN 201910622427A CN 110470984 A CN110470984 A CN 110470984A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/34—Testing dynamo-electric machines
- G01R31/343—Testing dynamo-electric machines in operation
Abstract
The present invention relates to a kind of three-level formula starter-generator faults in rotating rectifiers on-line checking and localization methods, carry out on-line fault diagnosis and positioning to three-level formula starter-generator rotating rectifier according to current locus geometrical characteristic.Exciter rotor current value is carried out to mark change processing, and calculates the current locus centre coordinate value under two phase coordinate systems.Solve exciter rotor current locus central point to coordinate origin distance, to judge whether rotating rectifier has occurred failure；Current locus central point is solved to the line of coordinate origin and the angle of α axis, to judge the position of failure diode in rotating rectifier；The length and width ratio for solving current locus, to judge the fault type of failure diode.Whether mentioned method real-time judge rotating rectifier can not only break down online, and the position of fault type and failure diode can be judged when failure occurs, and method is realized simply.
Description
Technical field
The invention belongs to Diagnosing Faults of Electrical technical fields, are related to a kind of three-level formula starter-generator faults in rotating rectifiers
On-line checking and localization method, and in particular to a kind of three-level formula brushless synchronous starter-generator based on current locus geometrical characteristic
Faults in rotating rectifiers on-line checking and localization method.
Background technique
With the development of more electric aircrafts, there is the starting-generating integration for the advantages such as volume weight is small, level of integrated system is high
Technology is increasingly paid close attention to by research.Primary study object of the aviation three-level formula brushless synchronous machine as the technology, Yu Mei
Starting-generating integration is successfully realized on 787 aircraft of state's Boeing.Three-level formula aviation brushless synchronous starting-generating system (abbreviation three-level
Formula starter/generator) it is mainly made of main motor, exciter, permanent magnetic auxiliary exciter, rotating rectifier, structural schematic diagram such as Fig. 1
It is shown.
No matter three-level formula motor is in starting mode or power generation mode, the exciting current of main motor is by exciter through revolving
Rectifier offer is provided.Aerospace applications background is more demanding to three-level formula starter/generator system reliability, and the motor is being run
In the process, rotating rectifier is in the more rugged environment such as rotation, high temperature, vibration, is most easily sent out in three-level formula starter/generator
The component of raw failure.Therefore, the fault diagnosis for carrying out rotating rectifier is to improve the base of three-level formula starter/generator system reliability
Plinth.
Rotating rectifier is made of six diodes, and failure is broadly divided into two classes of short circuit and open circuit of diode.Occur
When open-circuit fault, the electric current of exciter rotor open phase reduces, and main motor exciting current reduces, and system can carry out shutdown guarantor at this time
Shield, can also the volume of dropping continue to run.And when shorted diode fault occurs, exciter rotor electric current increased dramatically, and system needs
Rapid stoppage protection is wanted in order to avoid failure is spread, causes bigger harm.Therefore for rotating rectifier open-circuit fault and short trouble
Processing mode is often different.So needing to carry out the type of failure quasi- when carrying out the diagnosis of rotating rectifier diode breakdown
Really judgement, to carry out different processing according to system requirements.On the other hand, the accurate positionin of faults in rotating rectifiers diode
It is of great significance to system rapid-maintenance and element replacement.Therefore when carrying out fault diagnosis, it is also desirable to judge be which two
Failure has occurred in pole pipe, i.e., positions to failure.To sum up, three-level formula starter/generator Fault Diagnosis of Rotating Rectifier is being carried out
When, it should determine whether rotating rectifier breaks down, it will also clear failure type and determination in case of a failure
The diode location to break down.Often a diode breaks down when rotating rectifier breaks down, and needs to rotate
As long as a diode breaks down and will make Accurate Diagnosis and take corresponding measure in rectifier.Therefore the present invention is only to rotation
Turn a case where diode breaks down in rectifier to be diagnosed.
When rotating rectifier is in different faults state, the geometrical characteristic and normal work of exciter rotor current locus
When it is different.The present invention passes through current locus central point to coordinate from the geometrical characteristic of exciter rotor current locus
Origin apart from size, current locus center to coordinate origin line and α axis corner dimension and current locus length-width ratio size
Etc. information carry out the diagnosis of rotating rectifier diode breakdown and positioning.Mentioned method may be implemented whether rotating rectifier occurs event
The inline diagnosis of barrier and the judgement of fault type and the positioning of failure diode.
Summary of the invention
Technical problems to be solved
In order to avoid the shortcomings of the prior art, the present invention proposes a kind of three-level formula starter-generator rotating rectifier event
Hinder on-line checking and localization method, technical problems to be solved are main are as follows: in three-level formula starter-generator operational process, online
Whether the diode in diagnosis rotating rectifier breaks down, and judges the position of fault type and failure diode.
Technical solution
A kind of three-level formula starter-generator faults in rotating rectifiers on-line checking and localization method, it is characterised in that step is such as
Under:
Step 1 calculates current locus centre coordinate value i ' of the exciter rotor electric current under two phase coordinate systemsα,i′β:
Sample exciter rotor α phase current I in a cycleα, β phase current IαAnd current amplitude Is, one is calculated in real time
I in periodα、IβAnd IsAverage value beWithUtilize the average value of exciter rotor current amplitudeTo α phase current and
β phase current average valueIt carries out marking change processing being i 'α、i′β, thenFor exciter rotor electric current
The center point coordinate of track；
Step 2, according to current locus central point, size judges whether rotating rectifier occurs event at a distance from coordinate origin
Barrier:
Distance of the calculating exciter rotor current locus central point to coordinate origin
Compare distance d and given threshold d0If: d > d0, then judge that rotating rectifier breaks down, carry out step 3；Otherwise
Judge that rotating rectifier is working properly；
Step 3 judges the diode that rotating rectifier breaks down:
Calculating current track centers point is to the line of coordinate origin and angle theta=atan2 (i ' of α axis positive axisβ,i′α)；
Defining bridge arm and the diode of lower bridge arm number in rotating rectifier a phase is respectively D1 and D4, and bridge arm is under in b phase
The diode number of bridge arm is D3 and D6, and bridge arm and the diode of lower bridge arm number are D5 and D2, θ value place angle model in c phase
Enclose the corresponding relationship for judging failure diode are as follows:
| θ | Failure diode number |
| 150 °~210 ° | D1 |
| 210 °~270 ° | D2 |
| 270 °~330 ° | D3 |
| 270 °~330 °, 0 °~30 ° | D4 |
| 30 °~90 ° | D5 |
| 90 °~150 ° | D6 |
Step 4 determines that failure diode is open-circuit fault or short trouble:
1, when judging failure diode for D1 or D4, I 'α=Iα, I 'β=Iβ；When judging failure diode for D3 or D6
When,When failure pipe is D2 or D5,It carries out marking the α phase current for changing processing and β phase current is I "α、I″β, then
2, the ratio of span is projected as the length and width of current locus in the projection span on α axis and on β axis using current locus
Than:I″αmax I″αminFor I ' in a cycleα' maximum value and minimum value；I″βmax、I″βminIt is one
I in period "βMaximum value and minimum value；
3, length-width ratio Q and given threshold Q0It is compared, if Q > Q0, then judge that failure diode occurs in rotating rectifier
Otherwise short trouble judges failure diode either open failure in rotating rectifier.
The d0Value be 0~0.1.
The Q0Value between 0.433 to 0.866.
Beneficial effect
A kind of three-level formula starter-generator faults in rotating rectifiers on-line checking and localization method proposed by the present invention, according to
Current locus geometrical characteristic to carry out on-line fault diagnosis and positioning to three-level formula starter-generator rotating rectifier.To exciter
Rotor current carries out marking change processing, and calculates the current locus centre coordinate value under two phase coordinate systems.Exciter is solved to turn
Electron current track centers point to coordinate origin distance, to judge whether rotating rectifier has occurred failure；Solve current rail
Mark central point is to the line of coordinate origin and the angle of α axis, to judge the position of failure diode in rotating rectifier；It solves
The length and width ratio of current locus, to judge the fault type of failure diode.Mentioned method can not only online real-time judge rotation
Turn whether rectifier breaks down, and can judge the position of fault type and failure diode when failure occurs, and side
Method is realized simple.Mentioned method helps to improve three-level formula starter-generator system operational reliability and maintenance convenience.
Detailed description of the invention
Fig. 1 is three-level formula starter-generator structural schematic diagram；
Fig. 2 is three-level formula starter-generator rotor portion schematic equivalent circuit；
Fig. 3 is proposed Fault Diagnosis of Rotating Rectifier and localization method thinking by the present invention；
Fig. 4 is mentioned Fault Diagnosis of Rotating Rectifier and localization method block diagram by the present invention；
Fig. 5 is exciter rotor α phase and β phase current；
Fig. 6 is exciter rotor α phase, β phase and current amplitude average value；
Fig. 7 is exciter rotor current locus centre coordinate value；
Fig. 8 is exciter rotor current locus center to coordinate origin distance；
Fig. 9 is exciter rotor current locus center to coordinate origin line and α axle clamp angle；
Figure 10 is exciter rotor current locus length-width ratio；
Specific embodiment
Now in conjunction with embodiment, attached drawing, the invention will be further described:
Fig. 3 show the thinking of the proposed Fault Diagnosis of Rotating Rectifier of the present invention and localization method；Fig. 4 show the present invention
The block diagram of mentioned Fault Diagnosis of Rotating Rectifier and localization method.With reference to the accompanying drawings and examples furtherly to the present invention
It is bright.
Three-level formula starter-generator structural schematic diagram used in embodiment as shown in Figure 1, wherein exciter stator excitation around
Group is three-phase windings.In system operation, motor speed 100r/min, exciter stator excitation frequency is 90Hz, excitation
Machine rotor power frequency is 100Hz.Mentioned fault diagnosis and positioning side are carried out by taking rotating rectifier A phase upper tube (D1) open circuit as an example
The explanation of method, embodiment include that specific step is as follows:
1: the central point of exciter rotor current locus figure is solved when motor operation, specific as follows:
(1.1) using the stator phase currents i of sensor detection exciteras、ibs、icsWith phase voltage uas、ubs、ucs, and lead to
Cross existing method: voltage equation and flux linkage equations according to exciter estimate exciter rotor three-phase current, are denoted as iar、ibr、
icr.According to coordinate transform formula
α phase current and β phase current of the exciter rotor electric current under two phase coordinate systems are calculated, is denoted as i respectivelyα、iβ, wave
Shape is as shown in Figure 5.Formula is used simultaneouslyCalculate the amplitude i of armature rotor electric currents。
(1.2) according to exciter rotor power frequency, exciter rotor α phase current, β phase are electric in real-time sampling a cycle
Stream and current amplitude:
The frequency of rotor current is 100Hz, and taking sample frequency is 20kHz, then the sampling number in electric current a cycleMoving Window use is carried out to exciter rotor α, β phase current in a cycle and current amplitude accordingly, respectively
It is denoted as Iα、IβAnd Is.I in a cycle is calculated in real timeα、IβAnd IsAverage value, be denoted as respectivelyWithAs shown in Figure 6.
(1.3) flat to calculated α phase current in 1.2 and β phase current using the average value of exciter rotor current amplitude
Mean value mark change processing, and mark changes that treated α phase current and β phase current average value are denoted as i ' respectivelyα、i′β, then(i′α,i′β) be exciter rotor current locus center point coordinate, specifically:
It is rightIt carries out marking change processing, is denoted as i 'α、i′β, can obtain
The center point coordinate that exciter rotor current locus can be obtained is (- 0.314, -0.056), as shown in Figure 7.
2. according to current locus central point, size judges whether rotating rectifier breaks down at a distance from coordinate origin, tool
Body are as follows:
(2.1) distance of the calculating exciter rotor current locus central point to coordinate origin
As shown in Figure 8.
(2.2) compare calculated distance d and given threshold d in 2.10Size: if d > d0, then judge rotating rectifier
It breaks down, otherwise judges that rotating rectifier is working properly.d0Value normally close in 0, and it is true according to practical application object
D value that is fixed, being calculated when should be greater than the d value calculated when rotating rectifier works normally, and being less than faults in rotating rectifiers state.
The threshold value d set in the present embodiment0=0.1.By multilevel iudge, d > d0=0.1, therefore judge rotating rectifier
Failure has occurred.
3: failure being positioned when step 2 judges that rotating rectifier breaks down, that is, determines failure diode
Position (or number).It is specific as follows:
(3.1) for the current locus centre coordinate (i ' calculatedα,i′β), utilize formula θ=atan2 (i 'β,i′α)
Current locus central point is calculated to the line of origin and the angle of α axis positive axis, θ=atan2 (i 'β,i′αThe arc of)=- 2.966
Degree, i.e., 190.1 °, as shown in Figure 9；
(3.2) defining bridge arm and the diode of lower bridge arm number in rotating rectifier a phase is respectively D1 and D4, b Xiang Shangqiao
Arm and the diode of lower bridge arm number are D3 and D6, and bridge arm and the diode of lower bridge arm number are D5 and D2 in c phase, such as Fig. 2 institute
Show.
According to the relation table of corner dimension and failure diode number, it can be determined that the diode that is out of order is D1.
θ value place angular range judges the mapping table of failure diode
| θ | Failure diode number |
| 150 °~210 ° | D1 |
| 210 °~270 ° | D2 |
| 270 °~330 ° | D3 |
| 270 °~330 °, 0 °~30 ° | D4 |
| 30 °~90 ° | D5 |
| 90 °~150 ° | D6 |
4: carrying out failure diode breakdown type on the basis of step 3 determines failure diode location (or number)
Judgement determines that failure diode is open-circuit fault or short trouble.It is specific as follows:
Judge the fault type of failure diode
(4.1) according to the judging result in 3.2 to the exciter rotor α phase current and β phase sampled in a cycle in 1.2
Electric current is coordinately transformed: when judging failure diode for D1 or D4, I 'α=Iα, I 'β=Iβ；When judging that failure diode is
When D3 or D6,When failure pipe is D2 or D5,Then carry out marking change processing again, mark changes that treated α phase current and
β phase current is denoted as I "α、I″β, then
Failure diode is D1, then available, I ' in the present embodimentα=Iα, I 'β=Iβ；It can be obtained after mark change processing
(4.2) defining current locus in the projection span on α axis is current locus with the ratio for projecting span on β axis
Length-width ratio seeks I in a cycle " in real timeαMaximum value (be denoted as I "αmax) and minimum value (be denoted as I "αmin) and I "βMost
Big value (is denoted as I "βmax) and minimum value (be denoted as I "βmin), and according to formulaCalculate the length of current locus
Wide ratioAs shown in Figure 10；
(4.3) compare calculated length-width ratio Q and given threshold Q in 4.20Size: if Q > Q0, then judge rotary rectifier
Short trouble occurs for failure diode in device, otherwise judges failure diode either open failure in rotating rectifier.Q0Take
Value determines between 0.433 to 0.866, and according to practical application object, should be greater than the event of rotating rectifier diode either open
Length and width ratio when barrier, and it is less than length and width ratio when short trouble occurs for rotating rectifier diode.
The threshold value Q set in the present embodiment0=0.7.By multilevel iudge, Q < Q0=0.7, therefore judge rotating rectifier
D1 pipe occur open-circuit fault.
In above-mentioned steps, if judging that rotating rectifier is in health status in step 2, without step 3 and step 4
Judgement；If judging that failure has occurred in rotating rectifier in step 2, the judgement of subsequent step 3 and step 4 is carried out.
Claims (3)
1. a kind of three-level formula starter-generator faults in rotating rectifiers on-line checking and localization method, it is characterised in that step is such as
Under:
Step 1 calculates current locus centre coordinate value i ' of the exciter rotor electric current under two phase coordinate systemsα,i′β:
Sample exciter rotor α phase current I in a cycleα, β phase current IαAnd current amplitude Is, a cycle is calculated in real time
Interior Iα、IβAnd IsAverage value beWithUtilize the average value of exciter rotor current amplitudeTo α phase current and β phase electricity
Levelling mean valueIt carries out marking change processing being i 'α、i′β, thenFor exciter rotor current locus
Center point coordinate；
Step 2, according to current locus central point, size judges whether rotating rectifier breaks down at a distance from coordinate origin:
Distance of the calculating exciter rotor current locus central point to coordinate origin
Compare distance d and given threshold d0If: d > d0, then judge that rotating rectifier breaks down, carry out step 3；Otherwise judge
Rotating rectifier is working properly；
Step 3 judges the diode that rotating rectifier breaks down:
Calculating current track centers point is to the line of coordinate origin and angle theta=atan2 (i ' of α axis positive axisβ,i′α)；
Defining bridge arm and the diode of lower bridge arm number in rotating rectifier a phase is respectively D1 and D4, bridge arm and lower bridge arm in b phase
Diode number be D3 and D6, bridge arm and the diode of lower bridge arm number are D5 and D2 in c phase, and θ value place angular range is sentenced
The corresponding relationship of disconnected failure diode are as follows:
Step 4 determines that failure diode is open-circuit fault or short trouble:
1, when judging failure diode for D1 or D4, I 'α=Iα, I 'β=Iβ；When judging failure diode for D3 or D6,When failure pipe is D2 or D5,It carries out marking the α phase current for changing processing and β phase current is I "α、I″β, then
2, the ratio of span is projected as the length-width ratio of current locus in the projection span on α axis and on β axis using current locus:I″αmax I″αminFor I in a cycle "αMaximum value and minimum value；I″βmax、I″βminFor a cycle
Interior I "βMaximum value and minimum value；
3, length-width ratio Q and given threshold Q0It is compared, if Q > Q0, then judge that short circuit occurs for failure diode in rotating rectifier
Otherwise failure judges failure diode either open failure in rotating rectifier.
2. three-level formula starter-generator faults in rotating rectifiers on-line checking and localization method according to claim 1, special
Sign is: the d0Value be 0~0.1.
3. three-level formula starter-generator faults in rotating rectifiers on-line checking and localization method according to claim 1, special
Sign is: the Q0Value between 0.433 to 0.866.
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| CN111896869A (en) * | 2020-07-11 | 2020-11-06 | 西北工业大学 | Five-phase permanent magnet synchronous motor open-circuit fault diagnosis method |
| CN111983449A (en) * | 2020-07-22 | 2020-11-24 | 西北工业大学 | Fault detection and positioning method for rotating rectifier in power generation stage of three-stage starting/generator |
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| CN111983449A (en) * | 2020-07-22 | 2020-11-24 | 西北工业大学 | Fault detection and positioning method for rotating rectifier in power generation stage of three-stage starting/generator |
| CN111983449B (en) * | 2020-07-22 | 2021-06-11 | 西北工业大学 | Fault detection and positioning method for rotating rectifier in power generation stage of three-stage starting/generator |
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