CN106324415B - Double-winding synchronous wind-driven generator interturn short-circuit failure diagnosing method and monitoring method - Google Patents
Double-winding synchronous wind-driven generator interturn short-circuit failure diagnosing method and monitoring method Download PDFInfo
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- CN106324415B CN106324415B CN201610676845.1A CN201610676845A CN106324415B CN 106324415 B CN106324415 B CN 106324415B CN 201610676845 A CN201610676845 A CN 201610676845A CN 106324415 B CN106324415 B CN 106324415B
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
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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
- G01R31/50—Testing of electric apparatus, lines, cables or components for short-circuits, continuity, leakage current or incorrect line connections
- G01R31/72—Testing of electric windings
Abstract
The present invention discloses a kind of double-winding synchronous wind-driven generator interturn short-circuit failure diagnosing method and monitoring method, the diagnostic method step includes: 1) when target generator is stationary state, a set of stator winding is controlled as test winding, and test voltage is applied to test winding by wind electric converter, by another set of stator winding as induction winding；2) according to the size relation between the three-phase induction voltage on induction winding and the line voltage for testing winding, the state of simplex winding shorted-turn fault occurs for diagnosis；The monitoring method work as every time wind electric converter complete process of self-test after, target generator starting before, according to above-mentioned diagnostic method execute interturn short-circuit failure diagnosing, if diagnosis arrive failure, issue fault warning.The present invention can diagnose in time, detect early stage stator simplex winding shorted-turn fault in double winding wind-driven generator, and have many advantages, such as that implementation method is simple, accurate without ancillary equipment and complex calculation, diagnostic result.
Description
Technical field
The present invention relates to synchro wind generator fault detection technique fields more particularly to a kind of double-winding synchronous wind-force to send out
Motor interturn short-circuit failure diagnosing method and monitoring method.
Background technique
Wind-force hair based on synchro wind generator (including permanent magnetism and the two kinds of synchro wind generator of electrical excitation)
Motor group is current mainstream Wind turbines product, can separately adjustable, speed-regulating range width with active power, reactive power
The advantages that.Due to running of wind generating set for a period of time after, it is mechanical gradually to expose some failures with electric component, therefore be true
Wind turbines stable and high effective operation is protected, early warning and maintenance are diagnosed in time with extremely important to the failure of Wind turbines critical component
Meaning.
Large-scale synchro wind generator is usually double-winding structure, is mounted in the cabin of Wind turbines, and matched
Wind electric converter is typically mounted on tower bottom.Winding short circuit failure is a kind of failure for being easier to occur in generator, mainly by exhausted
Edge ageing failure causes.There are mainly three types of short troubles for generator: i.e. turn-to-turn short circuit, phase fault and ground fault, in synchronization
In the winding failure of wind-driven generator, stator winding inter-turn short circuit failure is relatively conventional.Meeting when turn-to-turn short circuit occurs for stator winding
A large amount of vortex are generated in short-circuit loop, generated local pyrexia can greatly shorten insulation life around failure coil, if
The generation of the failure is detected not in time, then failure will continue to extend, and lead to ground short circuit or short circuit between phase and phase, motor
Temperature be continuously increased, it is last until motor damages completely, therefore to the stator simplex winding turn-to-turn of synchro wind generator early stage
Short trouble carries out diagnosis early warning, to find and cut off fault point to be very necessary in time at failure initial stage.
It is directed to the interturn short-circuit failure diagnosing of synchro wind generator at present, is normally based on to stator current using in Fu
The analyses such as leaf transformation, wavelet transformation, empirical mode decomposition are realized, but this kind of method for diagnosing faults one side current signal is sensitive
It spends poor, realizes that complicated and detection accuracy is not high；On the other hand larger by calculation amount needed for signal analysis technology, it is not easy
Realize timely fault diagnosis.If realizing wind-driven generator fault diagnosis by test equipment, since Wind turbines are typically all to pacify
Mounted in desolate and uninhabited place, site environment is severe, and every Wind turbines and unattended, manages simply by wind power plant
The heart realizes collection medium-long range monitoring, and wind-driven generator is all mounted in liftoff nearly hundred meters of high cabins, thus needs tester
Member carries special test equipment, and climbs nearly hundred meters from tower bottom and could test generator into cabin, realizes very not
It is convenient, it is not suitable for the application environment of wind field, and be difficult to realize detect in time yet.
Summary of the invention
The technical problem to be solved in the present invention is that, for technical problem of the existing technology, the present invention provides one
Kind can diagnose in time, detect the double-winding synchronous of early stage stator simplex winding shorted-turn fault in double winding wind-driven generator
Wind-driven generator interturn short-circuit failure diagnosing method and monitoring method, implementation method is simple, is not necessarily to ancillary equipment and complex calculation
And diagnostic result is accurate.
In order to solve the above technical problems, technical solution proposed by the present invention are as follows:
A kind of double-winding synchronous wind-driven generator interturn short-circuit failure diagnosing method, step include:
1) when target generator is stationary state, in control access target generator a set of stator winding as test around
Group, and test voltage is applied to the test winding by the wind electric converter with the mating installation of target generator, it is sent out by target
Another set of stator winding is as induction winding in motor；
2) it is closed according to the size between the line voltage of three-phase induction voltage and the test winding on the induction winding
The state of system and the three-phase electricity flow valuve on the test winding, diagnose two sets stator winding in target generator occur lists around
The state of group shorted-turn fault.
As the further improvement of diagnostic method of the present invention, the specific steps of the step 2) are as follows:
2.1) the three-phase induction voltage value in induction winding described in target generator is detected, and obtains the test winding
On line voltage value；
2.2) the three-phase induction voltage value is compared with the line voltage value respectively, if not being equal, then
There are stator winding generation shorted-turn faults for diagnosis, and are that event occurs for induction winding or test winding by comparison result diagnosis
Barrier, wherein when be diagnosed as induction winding break down when, according to the state positioning failure phase of the three-phase induction voltage value；When examining
Break for test winding break down when, be transferred to execute step 2.3)；
2.3) the three-phase electricity flow valuve on the test winding is detected, event is positioned according to the state of the three-phase electricity flow valuve detected
Hinder phase.
As the further improvement of diagnostic method of the present invention, the specific steps of the step 2.2) are as follows: respectively described in judgement
In voltage ratio between three-phase induction voltage and the line voltage, 1 is respectively less than if there is two-phase voltage ratio and meets the
One Rule of judgment then diagnoses induction winding and breaks down, and location sense answers two-phase voltage ratio in winding to be respectively less than corresponding to 1
The winding of common terminal connection is failure phase；It is greater than 1 if there is voltage ratio and meets the second Rule of judgment, then diagnoses survey
Examination winding breaks down, and is transferred to and executes step 2.3).
As the further improvement of diagnostic method of the present invention, first Rule of judgment is less than (1- η), and wherein η is the
One correcting action；Second Rule of judgment is greater than (1+ δ), and wherein δ is the second correcting action.
As the further improvement of diagnostic method of the present invention, according to the three-phase electricity flow valuve detected in the step 2.3)
The specific steps of state positioning failure phase are as follows:
2.3.1 maximum current value in the three-phase electricity flow valuve detected) is obtained；
2.3.2) judge the step 2.3.1) obtain maximum current value whether be greater than I and meet third Rule of judgment,
Wherein I is the current value of stator winding under normal condition, if it is, diagnosing winding corresponding to the maximum current value and being mutually
Failure winding.
Further improvement as diagnostic method of the present invention, it is characterised in that: the third Rule of judgment is greater than (1+ β)
I, wherein β is third correcting action.
As the further improvement of diagnostic method of the present invention, the step 2.3.2) under normal condition stator winding electricity
The specific obtaining step of flow valuve are as follows: in advance target generator normal condition and it is static when, by wind electric converter apply with the survey
The current value for trying to obtain wind electric converter output on the identical voltage to a set of stator winding of voltage is as stator under normal condition
The current value of winding.
As the further improvement of diagnostic method of the present invention, in the step 2.1) line voltage of test winding especially by
The voltage value for obtaining the test voltage of wind electric converter output obtains.
As the further improvement of diagnostic method of the present invention, especially by sinusoidal pulse width modulation method control in the step 1)
Wind electric converter processed exports constant three-phase symmetrical alternating voltage as test voltage.
A kind of further double winding wind-driven generator shorted-turn fault monitoring method of the present invention, the monitoring method packet
It includes: every time after completing process of self-test with the wind electric converter of the mating installation of target generator, before the starting of target generator, according to
Above-mentioned diagnostic method executes interturn short-circuit failure diagnosing, if diagnosis issues failure to there is shorted-turn fault, to monitoring center
Alarm.
Further improvement as monitoring method of the present invention: the monitoring method further includes will have to realize the circle in advance
Between the fault diagnosis module of short trouble diagnostic method function be loaded onto step in the self-check program of wind electric converter, pass through calling
The fault diagnosis diagnostic module executes interturn short-circuit failure diagnosing.
Compared with prior art, double-winding synchronous wind-driven generator interturn short-circuit failure diagnosing method of the present invention the advantages of
In:
1) double-winding synchronous wind-driven generator interturn short-circuit failure diagnosing method of the present invention is sent out based on double-winding synchronous wind-force
Characteristic when shorted-turn fault occurs for the single stator winding of motor, by control access a set of stator winding as test around
Group, it is another set of as induction winding, apply test voltage from wind electric converter to test winding, according to the induced electricity of induction winding
Press test winding line voltage between size relation and test winding current status, can be diagnosed to be two sets of stators around
The shorted-turn fault generating state of group, implementation is simple, and without carrying out complicated operation, and diagnostic result accuracy is high；
2) double-winding synchronous wind-driven generator interturn short-circuit failure diagnosing method of the present invention, by with the mating installation of generator
Wind electric converter as auxiliary diagnostic tool, without increasing other auxiliary diagnosis equipment during entire diagnosis, can effectively drop
Cost needed for low checkout and diagnosis, diagnosis process can be realized by remote control, execute at the scene without tester, thus just
In the implementation for being applied to wind field environment；
3) double-winding synchronous wind-driven generator interturn short-circuit failure diagnosing method of the present invention, by double-winding synchronous wind-force
The situation that shorted-turn fault occurs for single stator winding in generator is diagnosed, and can detect the list of early stage stator in time
A slight Inter-turn Short Circuit Phenomenon of winding avoids failure propagation to handle it in time in failure early stage；
4) double-winding synchronous wind-driven generator interturn short-circuit failure diagnosing method of the present invention, by comparing the sense for incuding winding
Answer voltage and test winding line voltage it is whether equal, be diagnosed to be whether stator winding occurs shorted-turn fault, in conjunction with comparing
It is that induction winding breaks down or test winding that voltage change characteristic is i.e. diagnosable when as a result being occurred using shorted-turn fault
It breaks down；If being diagnosed as induction winding to break down, specific failure phase can be positioned by the state of inductive voltage value, if examining
Break and break down for test winding, the electric current state of value of binding test winding can position specific failure phase, realize failure classes
The positioning of the Accurate Diagnosis of type and specific fault point.
Compared with prior art, double-winding synchronous wind-driven generator shorted-turn fault monitoring method of the present invention the advantages of
In:
1) double-winding synchronous wind-driven generator shorted-turn fault monitoring method of the present invention, in conjunction with the self-test of wind electric converter
Process starts interturn short-circuit failure diagnosing after each wind electric converter executes self-test, thus works as and the event of stator simplex winding occur
It can be diagnosed to be in time when barrier, it, can be with instructor by long-range wind field center of the centralized monitor early warning when diagnosis is broken down
Work is handled in time, and the state of affairs is avoided to expand, to realize the timely monitoring of double-winding synchronous wind-driven generator shorted-turn fault；
2) double-winding synchronous wind-driven generator shorted-turn fault monitoring method of the present invention, further by that will have in advance
The fault diagnosis module of interturn short-circuit failure diagnosing method function is loaded onto the self-check program of wind electric converter, by calling event
Barrier diagnosis diagnostic module executes interturn short-circuit failure diagnosing, so that fault diagnosis can be certainly in the process of self-test of wind electric converter
It is dynamic to complete, realize effective monitoring of turn-to-turn short circuit.
Detailed description of the invention
Fig. 1 is the implementation process signal of the present embodiment double-winding synchronous wind-driven generator interturn short-circuit failure diagnosing method
Figure.
Fig. 2 is the structural schematic diagram of the system of double-winding synchronous wind-driven generator and the mating composition of wind electric converter.
Fig. 3 is the specific implementation flow schematic diagram that the present embodiment realizes interturn short-circuit failure diagnosing.
Fig. 4 is the implementation process signal of the present embodiment double-winding synchronous wind-driven generator shorted-turn fault monitoring method
Figure.
Specific embodiment
Below in conjunction with Figure of description and specific preferred embodiment, the invention will be further described, but not therefore and
It limits the scope of the invention.
As shown in Figure 1, the present embodiment double-winding synchronous wind-driven generator interturn short-circuit failure diagnosing method, step include:
1) when target generator is stationary state, in control access target generator a set of stator winding as test around
Group, and test voltage is applied to test winding by the wind electric converter with the mating installation of target generator, by target generator
In another set of stator winding as induction winding；
2) according to the size relation between the three-phase induction voltage on induction winding and the line voltage for testing winding, Yi Jisuo
The state for stating the three-phase electricity flow valuve of test winding diagnoses two sets of stator winding in target generator and simplex winding turn-to-turn short circuit event occurs
The state of barrier.
The system of double-winding synchronous wind-driven generator and the mating composition of wind electric converter is as shown in Fig. 2, in wind electric converter
Portion is made of grid side current transformer and generator-side converter, and grid side current transformer connects three-phase AC grid, for realizing PWM
Rectification, and stable DC side voltage；Generator-side converter is directly connected to the stator winding of double-winding synchronous wind-driven generator, uses
In the electric energy pick-up for issuing double-winding synchronous wind-driven generator to DC side, and power grid is sent to through grid side current transformer.Double wrap
The double winding of group synchro wind generator is usually star connection, and double winding (A1；B1；C1, A2；B2；C2 electric between)
Air bound is from the electric current of double winding is controlled by two generator-side converter wears respectively.Doublewound parameter in double-winding synchronous generator
Unanimously, two generator-side converter wears take master-slave control method, by a generator-side converter wear as main control, another generator-side converter wear
Operation is controlled by the controller of main control as from the power switch driving of control, the i.e. current transformer.As shown in Fig. 2, by connecting
The generator-side converter wear of stator A1, B1 and C1 terminal as main control, the generator-side converter wear of connecting stator A2, B2 and C2 terminal be from
Control.
Since for double-winding synchronous wind-driven generator, shorted-turn fault easily occurs for stator winding, and in turn-to-turn short circuit
Early stage occurs for failure, and more than two windings occur that the case where turn-to-turn short circuit is less, and the present embodiment is especially by double winding simultaneously
The situation that shorted-turn fault occurs for single stator winding in synchro wind generator is diagnosed, and can detect early stage in time
The slight Inter-turn Short Circuit Phenomenon of single winding of stator avoids failure propagation to handle it in time in failure early stage.
The present embodiment is special when occurring single winding interturn short-circuit failure to stator in double-winding synchronous wind-driven generator first
Property analyzed: when generator remains static, if access wherein a set of stator winding and by wind electric converter output
When test voltage, then voltage can be then induced on another set of stator winding, and since the parameter of two sets of stator winding is identical,
Structure in generator is full symmetric, and therefore, if not occurring shorted-turn fault, the stator winding of no applied voltage incudes
Voltage out should be consistent with alive stator winding line voltage is applied, and if the stator winding of no applied voltage turn-to-turn occur short
Lu Shi is reduced because it will lead to equivalent the number of turns, thus the voltage that the set stator phase winding induces can be than applying test voltage
Whether the correspondence phase voltage of stator winding is small, occur using the voltage change characteristic, that is, diagnosable no applied voltage stator winding
Turn-to-turn short circuit and position that turn-to-turn short circuit occurs in which winding；Correspondingly, if applying the certain appearance of stator winding of test voltage
Turn-to-turn short circuit causes equivalent the number of turns to reduce due to it, thus the induced voltage for not applying the stator winding of test voltage can increase
Greatly；Meanwhile the stator winding for applying test voltage, when mutually there is turn-to-turn short circuit, the reactance that will lead to the failure phase is reduced, then
When applying the alternating voltage of the identical amplitude of three-phase and frequency, the electric current of the failure phase can become larger, using the voltage change characteristic with
And curent change characteristic is diagnosable applies alive stator winding and turn-to-turn short circuit and positioning whether occur wherein which phase winding goes out
Existing turn-to-turn short circuit.
Specifically, when applying test voltage such as control access stator winding A1, B1, C1, on stator winding A2, B2, C2
The voltage will be induced, if turn-to-turn short circuit, stator winding A2, B2 and C2 induction occur in the certain of stator winding A2, B2 and C2
It is small that the voltage arrived can correspond to phase voltage than stator winding A1, B1, C1, utilizes the characteristic, that is, diagnosable stator winding A2, B2 and C2
Mutually whether there is turn-to-turn short circuit and position that turn-to-turn short circuit occurs in which winding；And if stator winding A1, B1 and C1 phase occurs
When turn-to-turn short circuit, it is big that stator winding A2, B2 and C2 induced voltage can correspond to phase voltage than stator winding A1, B1 and C1.In addition, if
There is turn-to-turn short circuit in stator winding A1, B1 and C1 phase, and the reactance of failure phase can reduce, when the identical amplitude of application three-phase and frequency
Alternating voltage when, the electric current of failure phase can become larger, and whether turn-to-turn occur using the characteristic diagnosable stator winding A1, B1 and C1
Wherein there is turn-to-turn short circuit in which phase winding for short circuit and positioning.
It is above-mentioned when shorted-turn fault occurs based on the single stator winding of double-winding synchronous wind-driven generator for the present embodiment
Characteristic accesses a set of stator winding as test winding by control, another set of as induction winding, from wind electric converter to survey
Try winding apply test voltage, according to induction winding induced voltage and test winding line voltage between size relation and
The current status for testing winding, the shorted-turn fault generating state of two sets of stator winding can be diagnosed to be using above-mentioned characteristic,
Implementation is simple, and without carrying out complicated operation, and diagnostic result accuracy is high.
The present embodiment target generator starting before, i.e., when rotor remain stationary state, by with the mating installation of generator
Wind electric converter can effectively reduce as auxiliary diagnostic tool without increasing other auxiliary diagnosis equipment during entire diagnosis
Cost needed for checkout and diagnosis, diagnosis process can be realized by remote control, execute at the scene without tester, thus be convenient for
Implementation applied to wind field environment.
In the present embodiment, constant three are exported especially by sinusoidal pulse width modulation method control wind electric converter in step 1)
Symmetrical alternating voltage is as test voltage.The output voltage of generator-side converter be positive string pwm voltage when, due to
Its fundamental wave size depends entirely on the modulation ratio of DC bus-bar voltage and generator-side converter control, the i.e. width of the fundamental voltage
Value size, phase and frequency be it is controlled, allow to control output test voltage according to demand, and the amplitude of test voltage,
Frequency etc. can determine to obtain.
In the present embodiment, the specific steps of step 2) are as follows:
2.1) the three-phase induction voltage value incuded on winding in target generator is detected, and obtains the line electricity on test winding
Pressure value；
2.2) three-phase induction voltage value is compared respectively with line voltage value, if not being equal, then diagnoses presence
Stator winding occur shorted-turn fault, and by comparison result diagnosis be induction winding or test winding break down, wherein when
Induction winding is diagnosed as when breaking down, according to the state positioning failure phase of three-phase induction voltage value；When be diagnosed as test winding
When breaking down, it is transferred to and executes step 2.3)；
2.3) the three-phase electricity flow valuve on detection test winding, according to the state positioning failure of the three-phase electricity flow valuve detected
Phase.
Whether the present embodiment is equal by comparing the induced voltage and the line voltage of test winding of induction winding, is diagnosed to be fixed
Whether sub- winding occurs shorted-turn fault, above-mentioned voltage change characteristic when being occurred in conjunction with comparison result using shorted-turn fault
I.e. diagnosable is that induction winding breaks down or tests winding and breaks down；If being diagnosed as induction winding to break down, by feeling
Answer the state of voltage value that can position specific failure phase using above-mentioned voltage change characteristic, if being diagnosed as test winding occurs event
The electric current state of value of barrier, binding test winding can position specific failure phase using above-mentioned curent change characteristic, realize failure
The positioning of the Accurate Diagnosis of type and specific fault point.
In the present embodiment, the line voltage of test winding is especially by the test for obtaining wind electric converter output in step 2.1)
The voltage value of voltage obtains.Electricity due to the reactance value of generator-side converter wear output reactance device and transmission cable compared to stator winding
Anti- value is too small, then it is believed that the output line voltage of generator-side converter is equal to be applied to the line voltage in stator terminal, this
Embodiment passes through the line voltage for directly taking the voltage value for the test voltage that can be directly determined as test winding, does not need
Again the voltage on detection test winding terminals, so that diagnosis realization is more simple, and does not influence diagnostic accuracy.The present embodiment tool
Body is stored in the amplitude U of test voltage as the line voltage value of test winding in parameter list, for subsequent and induction winding
Induced voltage compare.
Double-winding synchronous wind-driven generator is usually star connection, when target generator is star connection, step 2.2)
Specific steps are as follows: judged in the voltage ratio between three-phase induction voltage and line voltage respectively, if there is two-phase voltage ratio
Respectively less than 1 and meet the first Rule of judgment, then diagnoses induction winding and break down, and location sense answers two-phase voltage ratio in winding
The winding of the connection of common terminal corresponding to respectively less than 1 is failure phase；It is greater than 1 if there is voltage ratio and meets second and sentences
Broken strip part, then diagnostic test winding breaks down, and is transferred to and executes step 2.3).Turn-to-turn short circuit event occurs when being diagnosed as induction winding
When barrier, what it is due to detection is line voltage, and the present embodiment, which passes through, combines adjacent two induced voltage compared with line voltage, orients sense
Specific failure phase in winding is answered, realizes the accurate positioning of fault point.For the double-winding synchronous wind-driven generator of delta connection,
Its realization principle is consistent with the above.
In the present embodiment, it is contemplated that correcting action is arranged in the influence of sampled value error and time constant filter etc., and first sentences
Broken strip part is less than (1- η), and wherein η is that the first correcting action is examined when being respectively less than k (1- η) if there is two-phase voltage ratio
Disconnected induction winding breaks down；Second Rule of judgment is (1+ δ), and δ is the second correcting action, i.e., is greater than if there is voltage ratio
When k (1+ δ), stator winding inter-turn short circuit failure occurs for diagnosis.η, δ can be specifically configured according to actual needs.
In the present embodiment, according to the specific steps of the state positioning failure phase of the three-phase electricity flow valuve detected in step 2.3)
Are as follows:
2.3.1 maximum current value in the three-phase electricity flow valuve detected) is obtained；
2.3.2) judgment step 2.3.1) whether the maximum current value that obtains be greater than I and meet third Rule of judgment, wherein I
For the current value of stator winding under normal condition, if it is, winding corresponding to diagnosis maximum current value is mutually failure winding.
The current value I of the present embodiment stator winding using under normal condition judges the electric current of test winding as benchmark value
State of value can position specific fault point using above-mentioned current characteristics by electric current state of value.In view of sampled value error and filter
The influence of wave time constant etc., to reference value I setting correcting action is compared, then third Rule of judgment is the wherein β greater than (1+ β) I
For third correcting action, i.e., (1+ β) I when maximum current value is greater than, the maximum winding of location current are mutually failure winding.
In the present embodiment, step 2.3.2) under normal condition stator winding the specific obtaining step of current value are as follows: in advance
Target generator normal condition and it is static when, by wind electric converter apply identical with test voltage voltage to a set of stator around
In group, current value of the current value of wind electric converter output as stator winding under normal condition is obtained.The present embodiment specifically exists
After Wind turbines in-site installation has normally been debugged, generator is static do not rotate when, by main control generator-side converter wear export and survey
The identical voltage of examination voltage is applied on a set of stator winding, measure current transformer output current value I be stored in parameter list with
Electric current as stator winding under normal condition.
The above-mentioned voltage value of the present embodiment, current value specifically take virtual value, naturally it is also possible to take amplitude etc. according to actual needs.
Such as Fig. 3, the present embodiment generator is static do not rotate when, closed especially by control switch K1, K2 is disconnected, access
Stator winding A1, B1, C1 are test winding, and stator winding A2, B2, C2 are induction winding；By generator-side converter wear according to a tentering
Value (virtual value U), frequency f size inversion go out the constant symmetrical voltage of three-phase and are applied on stator winding A1, B1, C1, and voltage passes
Sensor detects that the induced voltage on another set of stator winding terminals A2, B2, C2 is UA2B2、UB2C2And UC2A2；Calculate A2, B2 and
The ratio of C2 stator sense line voltage and A1, B1 and C1 stator line voltageWithSuccessively judge respectively adjacent
Voltage ratioWithWithWithWhether (1- η) is less than simultaneously, if it is, diagnosis is deposited
Shorted-turn fault occurs in stator winding, and the shared connecting terminal for positioning the two adjacent stators line voltages less than (1- η) is
Failure phase is such as worked as and is judgedWithWhen being both less than (1- η) with application voltage U ratio, shared connecting terminal B2 institute is positioned
The B2 phase winding of connection is failure phase winding.And when A2, B2 and C2 stator sense line voltage and A1, B1 and C1 stator line voltage
RatioWithOccur being greater than (1+ δ), and if maximum current value is greater than electric current base in three stator currents
Quasi- value (1+ β) I, then positioning the corresponding phase stator winding of maximum current is failure phase winding, such as electric current Ia1It positions and corresponds to when maximum
Shorted-turn fault has occurred in A1 phase.
As shown in figure 4, the present embodiment double-winding synchronous wind-driven generator shorted-turn fault monitoring method includes: to work as every time
With target generator it is mating according to wind electric converter complete process of self-test after, target generator starting before, according to above-mentioned failure
Diagnostic method executes interturn short-circuit failure diagnosing, if diagnosis issues fault warning to there is shorted-turn fault, to monitoring center.
Lead to bad serious consequence after actuation to avoid wind electric converter midway from failure occur, Wind turbines weigh every time
Wind electric converter can be all required first to complete process of self-test when opening, i.e., before wind electric converter starts operation every time, not outer plus any
In the case where detection device or instrument, by its internal control system automatic running test program to important electrical group of current transformer
Fault detection, which is carried out, at component forbids follow-up operation process if it find that mistake, will provide information alert or warning.Wind-powered electricity generation becomes
When flowing device execution self-test, double-winding synchronous generator rotor remain stationary state, the self-test of the present embodiment combination wind electric converter
Process starts above-mentioned interturn short-circuit failure diagnosing after each wind electric converter executes self-test, when there is simplex winding failure
It can be diagnosed to be in time, by long-range wind field center of the centralized monitor early warning when diagnosis is broken down, instruct artificial place in time
Reason, avoids the state of affairs from expanding, to realize the timely monitoring of double-winding synchronous wind-driven generator shorted-turn fault.
It further include that will be loaded in advance with the fault diagnosis module of interturn short-circuit failure diagnosing method function in the present embodiment
Into the self-check program of wind electric converter, by calling fault diagnosis diagnostic module to execute interturn short-circuit failure diagnosing, to make
It obtains fault diagnosis to complete in the process of self-test of wind electric converter, to carry out turn-to-turn short circuit event in wind electric converter self-test automatically
Barrier diagnosis, realizes effective monitoring of turn-to-turn short circuit, simultaneously because above-mentioned interturn short-circuit failure diagnosing method is without complicated calculating
Process is realized by the way that the controller of wind electric converter is i.e. controllable.
The above-mentioned double-winding synchronous wind-driven generator shorted-turn fault monitoring method of the present embodiment needs wind electric converter certainly
Body does not have electric fault, thus when wind electric converter self-test does not pass through, needs first to exclude wind electric converter faults itself.Wind-powered electricity generation becomes
Before stream device launches into normal work, itself most of electric fault can be generally detected by self-test, however since wind-powered electricity generation becomes
Stream device output is directly connected by long transmission cable with double-winding synchronous aerogenerator stator terminal, therefore in its self-test
Cheng Zhong such as cannot normally export three-phase symmetrical alternating voltage, at this time if the case where abnormal output occurs in generator-side converter
It needs to judge to be that hardware fault occurs in generator-side converter part or electric fault occurs in generator.Due to wind-powered electricity generation
Current transformer is mounted on column foot, thus in the above-mentioned unsanctioned situation of current transformer self-test, it can be by shutting down power-off by manually examining
It is that current transformer own hardware failure occurs that survey mode can be convenient, which discerns whether,.
It should be noted that the present invention is diagnosed for double-winding synchronous wind-driven generator, it is adapted to work in
The generator of power generation mode also can be applied to the operating condition for working in electric motor mode；In addition, present invention can also apply to more
Winding synchro wind generator and other kinds of synchronous generator to be diagnosed to single winding interturn short-circuit failure,
Working principle is consistent with the above.
Above-mentioned only presently preferred embodiments of the present invention, is not intended to limit the present invention in any form.Although of the invention
It has been disclosed in a preferred embodiment above, however, it is not intended to limit the invention.Therefore, all without departing from technical solution of the present invention
Content, technical spirit any simple modifications, equivalents, and modifications made to the above embodiment, should all fall according to the present invention
In the range of technical solution of the present invention protection.
Claims (10)
1. a kind of double-winding synchronous wind-driven generator interturn short-circuit failure diagnosing method, which is characterized in that step includes:
1) when target generator is stationary state, a set of stator winding is used as test winding in control access target generator,
And test voltage is applied to the test winding by the wind electric converter with the mating installation of target generator, by target generator
In another set of stator winding as induction winding；
2) according to it is described induction winding on three-phase induction voltage and it is described test winding line voltage between size relation, with
And the state of the three-phase electricity flow valuve on the test winding, it diagnoses two sets of stator winding in target generator and simplex winding turn-to-turn occurs
The state of short trouble；
The specific steps of the step 2) are as follows:
2.1) the three-phase induction voltage value in induction winding described in target generator is detected, and is obtained on the test winding
Line voltage value；
2.2) the three-phase induction voltage value is compared respectively with the line voltage value, if not being equal, is then diagnosed
There are stator winding, and shorted-turn fault occurs, and is that induction winding or test winding break down by comparison result diagnosis,
In when be diagnosed as induction winding break down when, according to the state positioning failure phase of the three-phase induction voltage value；When being diagnosed as
When test winding breaks down, it is transferred to and executes step 2.3)；
2.3) the three-phase electricity flow valuve on the test winding is detected, according to the state positioning failure of the three-phase electricity flow valuve detected
Phase.
2. double-winding synchronous wind-driven generator interturn short-circuit failure diagnosing method according to claim 1, which is characterized in that
The specific steps of the step 2.2) are as follows: judge the voltage ratio between the three-phase induction voltage and the line voltage respectively
In, 1 is respectively less than if there is two-phase voltage ratio and meets the first Rule of judgment, then diagnoses induction winding and break down, and is fixed
Position induction winding in two-phase voltage ratio be respectively less than 1 corresponding to common terminal connection winding be failure phase；If there is
Voltage ratio is greater than 1 and meets the second Rule of judgment, then diagnostic test winding breaks down, and is transferred to and executes step 2.3).
3. double-winding synchronous wind-driven generator interturn short-circuit failure diagnosing method according to claim 2, it is characterised in that:
First Rule of judgment is less than (1- η), and wherein η is the first correcting action；Second Rule of judgment be greater than (1+ δ),
Wherein δ is the second correcting action.
4. double-winding synchronous wind-driven generator interturn short-circuit failure diagnosing method according to claim 1 or 2 or 3, special
Sign is, according to the specific steps of the state positioning failure phase of the three-phase electricity flow valuve detected in the step 2.3) are as follows:
2.3.1 maximum current value in the three-phase electricity flow valuve detected) is obtained；
2.3.2) judge the step 2.3.1) whether the maximum current value that obtains be greater than I and meet third Rule of judgment, wherein I
For the current value of stator winding under normal condition, if it is, diagnosing winding corresponding to the maximum current value is mutually failure
Winding.
5. double-winding synchronous wind-driven generator interturn short-circuit failure diagnosing method according to claim 4, it is characterised in that:
The third Rule of judgment is greater than (1+ β) I, and wherein β is third correcting action.
6. double-winding synchronous wind-driven generator interturn short-circuit failure diagnosing method according to claim 5, it is characterised in that:
The step 2.3.2) under normal condition stator winding the specific obtaining step of current value are as follows: it is normal in target generator in advance
State and it is static when, applied on identical with test voltage voltage to a set of stator winding by wind electric converter, acquisition wind
Current value of the current value of electric converter output as stator winding under normal condition.
7. double-winding synchronous wind-driven generator according to any one of claims 1 to 3 interturn short-circuit failure diagnosing side
Method, it is characterised in that: the line voltage of test winding is especially by the test for obtaining wind electric converter output in the step 2.1)
The voltage value of voltage obtains.
8. double-winding synchronous wind-driven generator according to any one of claims 1 to 3 interturn short-circuit failure diagnosing side
Method, it is characterised in that: export constant three especially by sinusoidal pulse width modulation method control wind electric converter in the step 1)
Symmetrical alternating voltage is as test voltage.
9. a kind of double-winding synchronous wind-driven generator shorted-turn fault monitoring method, which is characterized in that the monitoring method packet
It includes: every time after completing process of self-test with the wind electric converter of the mating installation of target generator, before the starting of target generator, according to
Interturn short-circuit failure diagnosing method described in claim 1~8 any one executes interturn short-circuit failure diagnosing, if diagnosis is to out
Existing shorted-turn fault issues fault warning to monitoring center.
10. double-winding synchronous wind-driven generator shorted-turn fault monitoring method according to claim 9, feature exist
In: the monitoring method further includes will have the fault diagnosis module for realizing the interturn short-circuit failure diagnosing method function in advance
It is loaded onto step in the self-check program of wind electric converter, by calling the fault diagnosis diagnostic module to execute shorted-turn fault
Diagnosis.
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| CN112861350B (en) * | 2021-02-08 | 2023-03-07 | 华侨大学 | Temperature overheating defect early warning method for stator winding of water-cooled steam turbine generator |
| CN115378343A (en) * | 2022-04-22 | 2022-11-22 | 宁德时代新能源科技股份有限公司 | Motor control method and device, electric equipment and storage medium |
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