CN108279362A - Marine double fed electric machine rotor winding interturn short-circuit fault identification method - Google Patents
Marine double fed electric machine rotor winding interturn short-circuit fault identification method Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The present invention relates to a kind of marine double fed electric machine rotor winding interturn short-circuit fault identification methods, for the feature of double-fed fan rotor short circuit, the characteristics of previous identified parameters are affected by revolutional slip is broken, introduce magnetic linkage diagnosis, by voltage caused by rotor interturn short-circuit failure, electric current both sides flux observation difference is fault characteristic value, Fault characteristic parameters are amplified, this feature amount can accurately identify double fed electric machine rotor winding interturn short-circuit failure, and failure phase can be accurately positioned, tachometric survey error has been filtered out when obtaining characteristic quantity, influence so as to avoid measurement error to fault identification, to handle it in time, it can reliably realize that double fed electric machine rotor winding interturn short-circuit initial failure recognizes, improve the service life of double feedback electric engine, the generation of averting a calamity property failure reduces the economic loss caused by failure.
Description
Technical field
The present invention relates to a kind of electrical fault identification technique, more particularly to a kind of sea based on bilateral flux observation difference is double
Generating aid rotor interturn short-circuit fault identification method.
Background technology
In recent years, with global energy supply, energy security and ecological environment the problems such as, becomes increasingly conspicuous, and utilization can
The renewable sources of energy become the important channel of countries in the world energy strategy and the important directions of the Implement of sustainable development strategy.It is especially extra large
The characteristics of upper wind-powered electricity generation is abundant, adjacent to load center due to offshore wind energy resource, is favored by numerous coastal states.China possesses
3000000 square kilometres of vast marine site, offshore wind energy resource is abundant, possesses the good condition of development offshore wind farm.Cut-off is extremely
The middle ten days in 2016, global installed capacity of wind-driven power have reached 456GW, and wherein offshore wind farm total installation of generating capacity reaches 14384MW.It accounts for
The 3.15% of global total installation of generating capacity.But due to marine wind electric field bad environments, weather it is complicated and changeable, far from land, cause
Offshore wind turbine high failure rate safeguards that inconvenient, disorderly closedown loss is big.Therefore in order to avoid non-programmed halt, and wind-force hair is reduced
The initial failure identification of the maintenance cost of electric system, wind power generating set is vital.
Turn-to-turn short circuit is a kind of catastrophe failure that double fed asynchronous machine is common.Interturn in stator windings short circuit has been obtained for both at home and abroad
The extensive concern of scholar has several frequently seen characteristic quantity when interturn in stator windings short trouble recognizes, such as negative-sequence current, power frequency
Spectrum, impedance variations etc..But the research of rotor interturn short-circuit is relatively fewer, this is because：1. by double feedback electric engine slip
The influence of rate, closer to synchronous speed, slip power is smaller, and rotor inter-turn short circuit is compared to interturn in stator windings short circuit institute
The fault message of generation is smaller, fault signature is weaker；2. the rotor windings rotated cause fault characteristic value to be not easy to extract.This is just
Difficulty is increased for the diagnosis of rotor inter-turn short circuit.Therefore in order to find the electric fault of offshore wind farm unit as early as possible, event is avoided
Crushing accident caused by barrier initial stage fails to judge.The scholars such as Li Junqing, Li Ming and Jung J H propose several rotor turn-to-turns
Short-circuit characteristic amount, including vibration, harmonic wave, power etc..The double-fed induction that Li Junqing, Wang Dong etc. are delivered in Automation of Electric Systems
Stator side when Stator Current Harmonic analyzes double fed electric machine rotor winding interturn short-circuit when Short Circuit Between Generator Rotor Windings
Harmonic characterisitic, and realize with this early diagnosis of rotor inter-turn short circuit.Li Junqing, Shen Liangyin etc. are upper in motor and control application
The simulation analysis document for the double-fed wind power generator rotor turn-to-turn short circuit based on stator mean instantaneous power spectral characteristic delivered
Propose the method that rotor inter-turn short circuit is diagnosed by mean instantaneous power spectral characteristic.
Invention content
The present invention be directed to the diagnostic method of double fed asynchronous machine rotor inter-turn short circuit is few, and the problem that difficulty is high, it carries
Go out a kind of marine double fed electric machine rotor winding interturn short-circuit fault identification method, for the feature of double-fed fan rotor short circuit,
Break the characteristics of previous identified parameters are affected by revolutional slip, introduces magnetic linkage diagnosis.By the calculating of magnetic linkage, by failure
Characteristic parameter amplifies.Proposing a kind of new fault characteristic value --- bilateral flux observation is poor.Double feedback electric engine has been initially set up to turn
The mathematical model of sub- winding interturn short-circuit failure, the magnetic linkage being then deduced under different operating modes according to the malfunction of motor are poor
Expression formula；Finally by emulation and experimental analysis, duplex feeding can reliably be realized by demonstrating bilateral flux observation difference proposed in this paper
Machine rotor winding interturn short-circuit initial failure recognizes.
The technical scheme is that：A kind of sea double fed electric machine rotor winding interturn short-circuit fault identification method, specifically
Include the following steps：
1) marine double feedback electric engine stator, rotor three-phase voltage and the three-phase current and rotating speed for waiting for fault identification are obtained；
2) rotor interturn short-circuit event is calculated through magnetic linkage extraction method in rotor three-phase voltage and rotor three-phase electric current
Barrier causes bilateral flux observation difference virtual value Δ ψ：
Wherein
Wherein △ ψsFor stator winding current side flux observation value and voltage side flux observation value difference value, △ ψrFor rotor around
Group current side flux observation value and voltage side flux observation value difference value, μ are short-circuit the ratio between the number of turns and rotor windings total number of turns, LlsFor
Stator winding leakage inductance, LlrFor rotor windings leakage inductance, LmsRotor mutual inductance value, Iar、Ibr、IcrRespectively rotor a, b, c phase currents,
Ias、Ibs、IcsRespectively stator A, B, C phase currents, θ are rotor angle, and ω is rotor current angular speed, and A is rotor current width
Value, θrFor rotor current t=0 moment phase angles；
3) failure phase is calculated with the difference of non-faulting phase Δ ψ to filter out measurement error, obtains fault severity level factor ξ, it is false
Rotor a phases are failure phase,
4) whether failure judgement severity factor ξ reaches fault pre-alarming value, if so then execute step 5), otherwise returns to step
It is rapid 1)；
5) this waits for that stator winding inter-turn short circuit failure occurs for the marine double feedback electric engine of fault identification, carries out troubleshooting.Institute
Magnetic linkage extraction method in step 2) is stated to be as follows：
201) three-phase signal for the marine double feedback electric engine for waiting for fault identification, including stator three-phase voltage, rotor three-phase are obtained
Voltage, stator three-phase current, rotor three-phase electric current and rotor speed；
202) current side magnetic linkage ψ is calculated according to stator, rotor three-phase electric current and the intrinsic parameter of motor1；
Wherein stator self inductance battle array
Rotor self-induction battle array
Mutual inductance battle array of the rotor to stator
203) voltage side magnetic linkage ψ is calculated according to stator, rotor three-phase voltage, electric current and motor impedance parameter2：
P is differential sign in formula；
204) each phase flux observation difference DELTA ψ=ψ is calculated1-ψ2；
205) wherein 202) complicated due to calculating, rotor interturn short-circuit fault condition f is introduced in theory deduction, it is false
Rotor a phases are failure phase, and fault condition meets double feedback electric engine Fault Equations：
206) it is directed to and 203) equally introduces pilot process rotor interturn short-circuit fault condition f,
If Iar=Asin (ω t+ θr) (18)
Then
207) pilot process f can be eliminated by being subtracted each other by result 205), 206), and it is poor to obtain required each phase magnetic linkage：
The beneficial effects of the present invention are：Sea double fed electric machine rotor winding interturn short-circuit fault identification method of the invention,
It is fault characteristic value by voltage caused by rotor interturn short-circuit failure, electric current both sides flux observation difference, this feature amount can be with
Double fed electric machine rotor winding interturn short-circuit failure is accurately identified, and failure phase can be accurately positioned, is filtered out when obtaining characteristic quantity
Tachometric survey error, the influence so as to avoid measurement error to fault identification improve duplex feeding to handle it in time
The generation of the service life of machine, averting a calamity property failure reduces the economic loss caused by failure.
Description of the drawings
Fig. 1 each phase magnetic linkage difference variation simulation result diagrams when being double feedback electric engine failure of the present invention；
Fig. 2 is the marine double fed electric machine rotor winding interturn short-circuit fault identification method flow chart of the present invention；
Fig. 3 each phase magnetic linkage difference variation experimental result pictures when being double feedback electric engine failure of the present invention；
Fig. 4 is each phase magnetic linkage difference simulation result diagram of double feedback electric engine under 1.43% fault degree of the invention；
Fig. 5 is each phase magnetic linkage difference experimental result picture of double feedback electric engine under 3.57% fault degree of the invention；
Fig. 6 is under the different short cut factors of the present invention and to filter out measurement error double feedback electric engine failure phase magnetic linkage difference simulation result
Figure.
Specific implementation mode
The fault model for establishing double feedback electric engine has many methods, such as m ulti-loop m ethod, FInite Element etc..But due to its structure
Complexity is unfavorable for inline diagnosis, therefore inline diagnosis is rarely applied in engineering.Existing double fed asynchronous machine stator a phase turn-to-turns are short
Mathematical model of the road failure under three-phase static coordinate system (abc coordinate systems), the model can accurately identify early stage turn-to-turn short circuit event
Barrier, but it is not suitable for rotor short-circuit operating mode.
Therefore existing stator winding inter-turn short circuit mathematical model is improved to rotor interturn short-circuit model.Assuming that electric
Machine is in magnetic circuit, circuit symmetrical, and the perfect condition that air gap is evenly distributed, it includes machines under rotor winding faults short-circuit loop to establish one
Mathematical model, double fed asynchronous machine rotor a phase turn-to-turn short circuit schematic diagrames are as shown in Figure 1.
Each phase magnetic linkage difference changes simulation result diagram when double feedback electric engine failure as shown in Figure 1, and horizontal axis is time t/s, the longitudinal axis
It is magnetic linkage difference/Wb.It is poor for stator ABC three-phase magnetic linkages that left side is followed successively by from top to bottom, and right side is followed successively by under as rotor abc
Three-phase magnetic linkage is poor.For the operating condition of Fig. 1, double fed electric machine rotor winding interturn short-circuit mathematical model is：
P is differential sign in formula；
Us=[Uas Ubs Ucs]TFor stator winding voltage matrix, Uas、Ubs、UcsRespectively stator A, B, C three-phase voltages；
Ur=[Uar Uar1Ubr Ucr]TFor rotor windings voltage matrix, Uar、Ubr、UcrRespectively rotor a, b, c three-phase electricities
Pressure, Uar1For the voltage of turn-to-turn short circuit part winding；
Rs=RsDiag [1 1 1] is stator winding resistance matrix；
Rr=RrDiag [1- μ μ 1 1] is rotor windings resistor matrix；
RrFor rotor resistance；RsFor stator resistance；
ψs=[ψas ψbs ψcs] T be stator winding magnetic linkage matrix, ψas、ψbs、ψcsRespectively stator A, B, C three-phases magnetic linkage；
ψr=[(1- μ) ψar μψar ψbr ψcr] it is rotor windings magnetic linkage matrix, ψar、ψbr、ψcrRespectively rotor a, b, c tri-
Phase magnetic linkage, μ are short cut factor, i.e., short-circuit the ratio between the number of turns and rotor windings total number of turns；
Is=[Ias Ibs Ics]TFor stator winding current matrix, Ias、Ibs、IcsFor stator A, B, C three-phase current；
Ir=[Iar Iar-If Ibr Icr]TFor rotor winding current matrix, Iae、Ibr、Icr, be rotor a, b, c three-phase electricity
Stream, IfFor rotor short-circuit electric current；
Stator self inductance battle array：
Rotor self-induction battle array：
Mutual inductance battle array of the rotor to stator：
Wherein LlsFor stator winding leakage inductance, LlrFor rotor windings leakage inductance, LmsRotor mutual inductance value, θ are rotor angle.
In order to quickly detect and identify shorted-turn fault, it is proposed that the method for bilateral flux observation difference.Establish normal shape
Motor dynamics model under state is compared with the magnetic linkage difference of failure double feedback electric engine, and it is poor to obtain bilateral flux observation, is carried out to it
The processing of measurement error is filtered out, and then identifies failure.
Stator, rotor three-phase electric current and rotating speed are detected, current side flux observation value ψ is calculate by the following formula out1：
Wherein stator self inductance battle array
Rotor self-induction battle array
Mutual inductance battle array of the rotor to stator
θrFor rotor current t=0 moment phase angles, θ=θ at this timer。
Stator, rotor three-phase voltage, electric current are detected, the differential p ψ of voltage side flux observation value are calculate by the following formula out2：
P is differential sign in formula；To p ψ2Integral obtains voltage and surveys flux observation value ψ2。
Calculate each phase flux observation difference DELTA ψ=ψ1-ψ2；
Wherein
△ψsFor stator winding current side flux observation value and voltage side flux observation value difference value, △ ψrFor rotor windings electricity
Side flux observation value and voltage side flux observation value difference value are flowed, θ is rotor angle, and ω is rotor current angular speed, and A is rotor
Current amplitude.
It can be seen that：Each phase magnetic linkage is related with short cut factor and short circuit current, and short circuit current is mainly by short cut factor
And the influence of short-circuit additional resistance, it is assumed that short-circuit additional resistance is constant, then the size of magnetic linkage difference is mainly related with short cut factor, and
Short cut factor is bigger, and magnetic linkage difference is bigger.
In rotor A phase fault, each phase magnetic linkage changing rule of stator is identical；It is each that rotor A phase magnetic linkage is clearly distinguishable from other
Phase change.Illustrate that the fault characteristic value can distinguish rotor failure and can be accurately positioned failure phase, so as fault signature
It measures to diagnose rotor inter-turn short circuit failure.
Consider the error of motor Parameters variation affected by environment and signal detection, magnetic when motor is normal in engineering
Chain difference is simultaneously not zero.If directly using magnetic linkage difference as failure criterion if be possible to influence breakdown judge accuracy.So being
The reliability and accuracy for ensureing diagnostic result, need the initial error to magnetic linkage difference to filter out.
Failure phase is calculated with the difference of non-faulting phase Δ ψ to filter out measurement error, obtains fault severity level factor ξ.(it is assumed that
Rotor a phases are failure phase)
Therefore it is illustrated in figure 2 a kind of stream of marine double feedback electric engine stator winding inter-turn short circuit failure discrimination method of the present invention
Cheng Tu, this method comprises the following steps：
Step 1：It obtains marine double feedback electric engine stator, rotor three-phase voltage and the three-phase current for waiting for fault identification and turns
Speed；
Step 2：It is short that through magnetic linkage extraction method rotor windings turn-to-turn is calculated in rotor three-phase voltage and rotor three-phase electric current
Road failure causes bilateral flux observation difference virtual value Δ ψ：
Wherein
Step 3：Failure phase is calculated with the difference of non-faulting phase Δ ψ to filter out measurement error, obtains the fault severity level factor
ξ.(it is assumed that rotor a phases are failure phase)
Step 4：Whether failure judgement severity factor ξ reaches fault pre-alarming value, if so then execute step 5, otherwise returns
Return step 1；
Step 5：This waits for that stator winding inter-turn short circuit failure occurs for the marine double feedback electric engine of fault identification, carries out at failure
Reason.
The step 2 is specially：
(201) three-phase signal for the marine double feedback electric engine for waiting for fault identification, including stator three-phase voltage, rotor three-phase are obtained
Voltage, stator three-phase current, rotor three-phase electric current and rotor speed；
(202) current side magnetic is calculated according to stator, rotor three-phase electric current and the intrinsic parameter of motor (leakage inductance, mutual inductance etc.)
Chain ψ1；
Wherein
(203) voltage side magnetic linkage ψ is calculated according to stator, rotor three-phase voltage, electric current and motor impedance parameter2；
P is differential sign in formula；
(204) each phase flux observation difference DELTA ψ=ψ is calculated1-ψ2；
(205) wherein (202) are complicated due to calculating, and rotor interturn short-circuit fault condition f is introduced in theory deduction,
(it is assumed that rotor a phases are failure phase)
Fault condition meets double feedback electric engine Fault Equations：
ψfFor the magnetic linkage matrix obtained by Fault EquationsDue to the voltage of turn-to-turn short circuit part winding, electric current
Uar1、Iar1It for the builtin voltage of turn-to-turn short circuit generation, electric current and is not easy to measure, passes through Fault Equations (magnetic when motor breaks down
Chain matrix ignores ψar1) and each phase magnetic linkage changing value for going out of normal equation calculation can be obtained by following formula：
(206) (203) are directed to and equally introduce pilot process rotor interturn short-circuit fault condition f,
If Iar=Asin (ω t+ θ) (18)
Then
(207) pilot process f can be eliminated by being subtracted each other by 205,206 result, and it is poor to obtain required each phase magnetic linkage：
For the emulation and experiment for not filtering out Error processing, it is symmetrical three-phase voltage that operating mode, which is network voltage, at this time,
Rotor slip 10%, sampling period Ts is 50 μ s when signal measurement, and the active -3000W that is given as of stator is (to flow into when normal work
The power of motor is positive direction), it is idle to be given as 0var, electric motor short circuit coefficient is by 0.0143 variation in t=5s when emulation
0.0357, same type failure then occurs in t=6.25s or so when experiment, for Protection equipment, when failure makes system drop volume
Operation, that is, when shorted-turn fault occurs, stator is active to be given as -2700W, idle to be given as 0var.Emulation and experimental result are such as
Shown in Fig. 1, Fig. 3.
As can be seen that emulation is almost the same with experimental result in Fig. 1, Fig. 3.And compared with formula, stator three-phase magnetic linkage
Spread value is almost the same；Rotor fault is mutually clearly distinguishable from other phases, and rotor non-faulting phase amplitude phase angle is consistent, and is significantly less than
Failure phase.Emulation and the results show correctness of theory deduction above.
Fig. 4, Fig. 5 are poor for the emulation under different faults severity, experiment magnetic linkage.Due to being limited by experiment condition
(rotor only there are two short-circuit tap) experiment is only capable of realization 1.43%, the simulation of 3.57% two kind of fault degree.
Since emulation is directed to desired motor, and the parameter of electric machine in kind is influenced by running environment and measurement error, is caused
Obtained magnetic linkage difference is tested slightly larger than emulation ideal value.But the changing rule of the two is consistent.
Fig. 1 and Fig. 3 demonstrates the correctness of fault model and fault characteristic value mathematical derivation, illustrates that this method may be implemented
Stator and Rotor Windings shorted-turn fault is distinguished, and failure phase can be accurately positioned.It can be adapted for the morning of rotor interturn short-circuit
Phase diagnoses.
Emulation above has been proven that the correctness of this paper modeling methods with experiment.But consider the needs in engineering,
It needs to influence caused by meter and measurement error.Fig. 6 is that there are the emulation for using formula (9) to filter out error when detection error for tach signal
As a result, it can be seen that the failure threshold of fault severity level factor ξ should be set to 0.005Wb, both can accurately recognized in this way
Go out 2 circles or more short circuit, and will not cause to judge by accident because of excessively sensitive.
In conclusion the influence by rejecting constant error, set forth herein diagnostic methods can accurately recognize double feedback electric engine
Rotor interturn short-circuit failure, and failure phase can be accurately positioned, and there is robustness to tach signal measurement error.
Claims (2)
1. a kind of sea double fed electric machine rotor winding interturn short-circuit fault identification method, which is characterized in that specifically include following step
Suddenly：
1) marine double feedback electric engine stator, rotor three-phase voltage and the three-phase current and rotating speed for waiting for fault identification are obtained；
2) rotor three-phase voltage and rotor three-phase electric current are calculated rotor interturn short-circuit failure and drawn through magnetic linkage extraction method
Play bilateral flux observation difference virtual value Δ Ψ：
Wherein
Wherein △ ψsFor stator winding current side flux observation value and voltage side flux observation value difference value, △ ψrFor rotor windings electricity
Side flux observation value and voltage side flux observation value difference value are flowed, μ is short-circuit the ratio between the number of turns and rotor windings total number of turns, LlsFor stator
Winding leakage inductance, LlrFor rotor windings leakage inductance, LmsRotor mutual inductance value, Iar、Ibr、IcrRespectively rotor a, b, c phase currents, Ias、
Ibs、IcsRespectively stator A, B, C phase currents, θ are rotor angle, and ω is rotor current angular speed, and A is rotor current amplitude,
θrFor rotor current t=0 moment phase angles；
3) failure phase is calculated with the difference of non-faulting phase Δ ψ to filter out measurement error, obtains fault severity level factor ξ, it is assumed that turn
Sub- a phases are failure phase,
4) whether failure judgement severity factor ξ reaches fault pre-alarming value, if so then execute step 5), otherwise return to step
1)；
5) this waits for that stator winding inter-turn short circuit failure occurs for the marine double feedback electric engine of fault identification, carries out troubleshooting.
2. marine double fed electric machine rotor winding interturn short-circuit fault identification method according to claim 1, which is characterized in that institute
Magnetic linkage extraction method in step 2) is stated to be as follows：
201) obtain wait for fault identification marine double feedback electric engine three-phase signal, including stator three-phase voltage, rotor three-phase voltage,
Stator three-phase current, rotor three-phase electric current and rotor speed；
202) current side magnetic linkage ψ is calculated according to stator, rotor three-phase electric current and the intrinsic parameter of motor1；
Wherein stator self inductance battle array
Rotor self-induction battle array
Mutual inductance battle array of the rotor to stator
203) voltage side magnetic linkage ψ is calculated according to stator, rotor three-phase voltage, electric current and motor impedance parameter2：
P is differential sign in formula；
204) each phase flux observation difference DELTA ψ=ψ is calculated1-ψ2；
205) wherein 202) complicated due to calculating, rotor interturn short-circuit fault condition f is introduced in theory deduction, it is assumed that turn
Sub- a phases are failure phase, and fault condition meets double feedback electric engine Fault Equations：
ψfFor the magnetic linkage matrix obtained by Fault EquationsDue to the voltage of turn-to-turn short circuit part winding, electric current Uar1、
Iar1It for the builtin voltage of turn-to-turn short circuit generation, electric current and is not easy to measure, magnetic linkage matrix ignores ψar1, pass through when motor breaks down
Each phase magnetic linkage changing value that Fault Equations and normal equation calculation go out can be obtained by following formula：
206) it is directed to and 203) equally introduces pilot process rotor interturn short-circuit fault condition f,
If Iar=Asin (ω t+ θr) (18)
Then
207) pilot process f can be eliminated by being subtracted each other by result 205), 206), and it is poor to obtain required each phase magnetic linkage：
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| CN109100608A (en) * | 2018-07-23 | 2018-12-28 | 华北电力大学（保定） | A kind of diagnostic method of the double-fed fan stator shorted-turn fault based on D-S information fusion algorithm |
| CN109342877A (en) * | 2018-09-14 | 2019-02-15 | 中国科学院电工研究所 | A kind of the winding interturn short-circuit fault detection means and method of fractional-slot concentratred winding magneto |
| CN111650439A (en) * | 2020-06-01 | 2020-09-11 | 神华国能集团有限公司 | Rotor winding alternating current impedance detection circuit and device |
| CN113992084A (en) * | 2021-12-29 | 2022-01-28 | 苏州乾能电气有限公司 | Method, system, device and medium for inhibiting generator vibration |
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| CN109342877A (en) * | 2018-09-14 | 2019-02-15 | 中国科学院电工研究所 | A kind of the winding interturn short-circuit fault detection means and method of fractional-slot concentratred winding magneto |
| CN109342877B (en) * | 2018-09-14 | 2021-03-26 | 中国科学院电工研究所 | Winding turn-to-turn short circuit fault detection device and method for fractional-slot concentrated winding permanent magnet motor |
| CN111650439A (en) * | 2020-06-01 | 2020-09-11 | 神华国能集团有限公司 | Rotor winding alternating current impedance detection circuit and device |
| CN113992084A (en) * | 2021-12-29 | 2022-01-28 | 苏州乾能电气有限公司 | Method, system, device and medium for inhibiting generator vibration |
| CN113992084B (en) * | 2021-12-29 | 2022-04-01 | 苏州乾能电气有限公司 | Method, system, device and medium for inhibiting generator vibration |
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