CN108196187A - Double-fed wind power generator rotor winding three-phase asymmetric load method for diagnosing faults - Google Patents
Double-fed wind power generator rotor winding three-phase asymmetric load method for diagnosing faults Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention discloses a kind of double-fed wind power generator rotor winding three-phase asymmetric load method for diagnosing faults, steps 1：Double-fed wind power generator rotor winding failure simulation system is built on dynamic model experiment platform；Step 2：Under the different conditions of motor operation, rotor current or voltage signal before and after rotor-side failure are obtained, unit faults recorder analysis device carries out corresponding recording, reads data by MATLAB and carries out that DC component filters out and FFT transform is handled；Step 3：Change apparent frequency as the characteristic frequency for diagnosing the failure before and after extracting failure according to the change rate of amplitude, sentence whether double-fed wind power generator rotor winding occurs asymmetrical three-phase load faulty for disconnected.Diagnostic result of the present invention is very close to actual value, and diagnostic result is effective, and diagnosis accuracy is high, and operability is strong.
Description
Technical field
The present invention relates to a kind of double-fed wind power generator rotor winding three-phase asymmetric load method for diagnosing faults, belong to drive
Dynamic motor status detection and fault diagnosis technology field.
Background technology
The normal operation of generator is significant to the safety and stability of entire power grid.In wind power plant, double-fed wind generating
The advantages that machine relies on high efficiency, low cost and power factor are adjustable becomes mainstream model.Due to severe, the wind-force hair of running environment
Failure caused by motor is far more than conventional generator.Therefore the reliability for enhancing Wind turbines, it is also pre- to carry out failure early stage
The work of alert and on-call maintenance, it is most important to the research of Wind turbines on-line monitoring technique.
Double-fed wind power generator rotor winding is due to one back-to-back converter of itself external circuits and connection, it is difficult to detect
Its operating status, and generator amature side controller parameter regulation lag, active power, reactive power, stator and rotor current and
Rotating speed etc. vibrates seriously before and after failure, so as to generate great impact with power grid in itself to motor, it is therefore desirable to strengthen to rotor
The on-line monitoring of winding state information.
At present, it is still at an early stage to the diagnosis research of double-fed wind power generator rotor winding failure both at home and abroad.It is domestic
Research it is relatively ripe, document can be transferred through the suitable characteristic signal of character pair method choice and find out failure；France
Picardie universities Yazidi A scholars establish that doubly-fed wind turbine is normal and the mould of rotor interturn short-circuit towards circuit
Type carries out simulation study；Kiel, Germany university Dinkhauser V scholars establish double feedback electric engine model using MATLAB softwares, lead to
The severity for introducing factor u characterization turn-to-turn faults is crossed, passes through wavelet analysis and imperial Burger observer trouble-shooting feature；Meaning is big
Experimental data when sharp bologna university Gritli Y scholars are to machines under rotor winding faults is analyzed, with wavelet transformation pair event
Barrier is quantified, and sets fixed threshold Judging fault, but does not account for rotor converter difference control strategy to extraction feature letter
Number influence.
Invention content
Purpose：In order to overcome the deficiencies in the prior art, the present invention provide a kind of double-fed wind power generator rotor around
Group asymmetrical three-phase load faulty diagnostic method.
Technical solution：In order to solve the above technical problems, the technical solution adopted by the present invention is：
A kind of double-fed wind power generator rotor winding three-phase asymmetric load method for diagnosing faults, includes the following steps：
Step 1：Double-fed wind power generator rotor winding failure simulation system is built on dynamic model experiment platform；
Step 2：The different conditions of motor operation are set by converting wind speed change revolutional slip, are obtained based on simulation system
Rotor current or voltage signal before and after rotor-side simulation threephase load asymmetric operation failure, and carry out different conditions lower rotor part
Current or voltage signal is corrected, then carries out corresponding recording using power failure analysis device, is read by MATLAB
Data and carry out DC component filter out and FFT transform processing；
Step 3：It analyzes under normal condition and malfunction, rotor current or voltage spectrum under different operating statuses
Figure, obtains the variation amplitude of ksf and its side frequency, and k=2n+1, n take the natural number since 1, and s is revolutional slip, and f is fundamental frequency, root
According to apparent frequency is changed before and after the change rate extraction failure of amplitude as the characteristic frequency for diagnosing the failure, double-fed is sentenced for disconnected
Whether wind power generator rotor winding occurs asymmetrical three-phase load faulty.
Preferably, the step 1 includes：
Step 1.1：5.5kW dc motors and 5.5kW wire-wound asynchronous motors are connected directly and form double-fed wind-force hair
Motor group, dc motor provide external excitation for asynchronous machine, control and show in real time by double-fed wind turbine excitation con-trol screen
Excitation size；Separately excited DC machine is directly connected to feature of wind machine simulator output terminal, and real-time reception becomes the adjusting letter of wind speed
Number；Output terminal connection rotor-side dsp controller in asynchronous machine rotor one side realizes the synchronization, supersynchronous, secondary of double fed asynchronous machine
Synchronous regime transformation, another side output terminal are directly connected to load and power failure analysis device, finally access grid side
Dsp controller is realized to be transmitted with the electric energy of power grid；The load is simulated with light bulb.
Preferably, the step 1 further includes：
Step 1.2：First test voltage, current transformer performance, pass through power frequency supply, pressure regulator, multimeter before experiment
Verifying voltage mutual inductor and secondary side cannot short circuit, string resistance, mutual using pressure regulator, clamp on amperemeter verificating current in the loop
Sensor and secondary side cannot open a way；
Step 1.3：In collection voltages current signal, dc magnetization effect is generated to avoid the occurrence of low frequency signal, is exceeded
Power frequency mutual inductor frequency transmission range and the phenomenon that lead to secondary side wave distortion, select the Hall current of model HZIA-C06
Sensor；Since rotor voltage numerical value is small, voltage sensor is directly accessed to the low frequency signal measuring device of middle member China electricity customization
In；
Step 1.4：In order to avoid occur due to rotor-side does not connect zero curve and the phenomenon that null offset occurs, by any phase with
Zero curve short circuit, then the voltage between phases value for appointing two-phase or current value are measured as corrected value, zero shift rectifying is carried out to measured signal.
Preferably, the step 2 includes：
Step 2.1：Wind speed is converted by feature of wind machine simulator regulation motor rotating speed, so as to change revolutional slip s
The doubly-fed wind turbine is set to be separately operable in three kinds of different operating statuses, including synchronous regime, subsynchronous state and super
Synchronous regime；
Step 2.2：Any doubly-fed wind turbine operating status is selected, when doubly-fed wind turbine is operated in normal shape
During state, the rotor current of measurement point or voltage between asynchronous machine and current transformer are obtained by current or voltage mutual inductor and surveyed
Value, then measured value is subtracted to the signal waveform of corrected value and is sent respectively to oscillograph analytical equipment；Signal waveform is passed through into direct current
Component filter out with FFT transform processing, respectively obtain the normal condition amplitude of sf, 3sf, 2-3sf, 2+3sf frequency everywhere；
Step 2.3：Certain breaking phase light bulb carrys out the asymmetrical three-phase operation troubles of fictitious load in simulation system, obtains again
The rotor current of measurement point or voltage measured value between asynchronous machine and current transformer are taken, then measured value is subtracted to the signal of corrected value
Waveform is sent respectively to oscillograph analytical equipment, and signal waveform by DC component is filtered out and is handled with FFT transform, is respectively obtained
The malfunction amplitude of sf, 3sf, 2-3sf, 2+3sf frequency everywhere.
Preferably, the step 3 includes：
Step 3.1：It asks under different doubly-fed wind turbine operating statuses, is measured between asynchronous machine and current transformer respectively
Changing value between point sf, 3sf, 2-3sf, 2+3sf frequency normal condition amplitude and malfunction amplitude, then changing value is distinguished
Divided by normal condition amplitude obtains change rate；
Step 3.2：The frequency values for choosing change rate maximum in sf, 3sf, 2-3sf, 2+3sf frequency are used as diagnosis three-phase not
The characteristic frequency of balanced load failure.
Preferably, the model ZH-2B of member China electricity customization during the power failure analysis device uses
Analysis device.
Preferably, the step 3 further includes：
It is same using 2-3sf as doubly-fed wind turbine time using 3sf as doubly-fed wind turbine generic state characteristic frequency
Step state characteristic frequency, using 2+3sf as the supersynchronous state characteristic frequency of doubly-fed wind turbine.
Advantageous effect：Double-fed wind power generator rotor winding three-phase asymmetric load fault diagnosis side provided by the invention
Method, diagnostic result is very close to actual value, and diagnostic result is effective, and diagnosis accuracy is high, and operability is strong.
The present invention is under doubly-fed wind turbine difference operating status, the fault characteristic frequency in rotor current signal
3sf and side frequency (2 ± 3sf) carry out whether double-fed wind power generator rotor winding occurs sentencing for threephase load asymmetric operation failure
Fixed and diagnosis.It the advantage is that：1st, it is not required to doubly-fed wind turbine rotor to be separated to study respectively, ensure that motor entirety
The integrality of structure operation, diagnostic result are highly reliable；2nd, in rotor windings threephase load asymmetric operation failure Newly diagnosed
High sensitivity is conducive to fault diagnosis and the containment of early stage.
Description of the drawings
Fig. 1 is double-fed wind power generator rotor winding failure simulation system structure diagram of the present invention；
Fig. 2 is double-fed wind power generator group structure diagram of the present invention；
Fig. 3 is asymmetrical three-phase load running Troubleshooting Flowchart of the present invention；
Subsynchronous state lower rotor part winding three-phase load asymmetric operation event when Fig. 4 is s=0.12 of the present invention
Measurement point is in the rotor current spectrogram of current transformer rotor-side before and after barrier；
Supersynchronous state lower rotor part winding three-phase load asymmetric operation event when Fig. 5 is s=-0.12 of the present invention
Measurement point is in the rotor current spectrogram of current transformer rotor-side before and after barrier.
Specific embodiment
The present invention is further described below in conjunction with the accompanying drawings.
As shown in Figure 1, map parameter is specified operating parameter.Feature of wind machine simulator turns for regulation motor
Speed, double-fed wind turbine excitation con-trol screen, for adjust the start-stop of rotor-side and grid side dsp controller and Parameters variation and rotating speed,
The real-time display of the numerical value such as active power, reactive power.The safety of Considering experimental and economy replace load with light bulb
And fictitious load is asymmetric by way of certain breaking phase light bulb；
As shown in Fig. 2, its measuring point distribution situation is indicated with circle in figure.Wherein 1-4 points position is respectively：Current transformer rotor
Net side 4 after net side 3 and current transformer after side 1, stator side 2, reactor.Suitable voltage, current transformer point are installed everywhere at this
Signal value that Ce Liang be before and after failure, so that succeeding spectral is analyzed；
As shown in figure 3, a kind of double-fed wind power generator rotor winding three-phase asymmetric load method for diagnosing faults, specific to grasp
It is as follows to make process：
Step 1：Double-fed wind power generator rotor winding failure simulation system is built on dynamic model experiment platform, the system packet
It includes：5.5kW dc motors, 5.5kW wire-wound asynchronous motors, feature of wind machine simulator, double-fed wind turbine excitation con-trol screen,
Load and power failure analysis device, rotor-side dsp controller, grid side dsp controller.
The safety of Considering experimental and economy replace load with light bulb, by using the side of certain breaking phase light bulb
Formula fictitious load is asymmetric；Voltage, the selection of current transformer performance and measure are carried out before experiment and overcomes three-phase amplitude
Asymmetry problem；
Step 2：The different conditions of motor operation are set by converting wind speed change revolutional slip, are obtained based on simulation system
Rotor current or voltage signal before and after rotor-side simulation threephase load asymmetric operation failure, and carry out different conditions lower rotor part
Current or voltage signal is corrected, then carries out corresponding recording using power failure analysis device, and data are stored as
Comtrade forms, by MATLAB read data and carry out DC component filter out and FFT transform handle；
Step 3：It analyzes under normal condition and malfunction, rotor current or voltage spectrum under different operating statuses
Figure obtains the variation amplitude of ksf (k=2n+1, n take the natural number since 1) and its side frequency, is carried according to the change rate of amplitude
The front and rear apparent frequency of variation of failure is taken as the characteristic frequency for diagnosing the failure, for break sentence double-fed wind power generator rotor around
Whether group occurs asymmetrical three-phase load faulty.
The step 1 includes：
Step 1.1：5.5kW dc motors and 5.5kW wire-wound asynchronous motors are connected directly and form double-fed wind-force hair
Motor group, dc motor provide external excitation for asynchronous machine, control and show in real time by double-fed wind turbine excitation con-trol screen
Excitation size；Separately excited DC machine is directly connected to feature of wind machine simulator output terminal, and real-time reception becomes the adjusting letter of wind speed
Number；Output terminal connection rotor-side dsp controller in asynchronous machine rotor one side realizes the synchronization, supersynchronous, secondary of double fed asynchronous machine
Synchronous regime transformation, another side output terminal are directly connected to load and power failure analysis device, finally access grid side
Dsp controller is realized to be transmitted with the electric energy of power grid.When building double-fed wind power generator rotor winding failure simulation system, wind is used
Power machine characteristic simulation device regulation motor rotating speed adjusts rotor-side and grid side dsp controller with double-fed wind turbine excitation con-trol screen
Start-stop and Parameters variation and rotating speed, active power, the real-time display of reactive power numerical value；It is simulated by certain breaking phase light bulb
The asymmetrical three-phase operation troubles of load；
Step 1.2：First test voltage, current transformer performance, pass through power frequency supply, pressure regulator, multimeter before experiment
It waits verifying voltages mutual inductor and secondary side cannot be short-circuit, string resistance, utilizes pressure regulator, clamp on amperemeter etc. to verify electricity in the loop
Current transformer and secondary side cannot open a way；
Step 1.3：In collection voltages current signal, dc magnetization effect is generated to avoid the occurrence of low frequency signal, is exceeded
Power frequency mutual inductor frequency transmission range and the phenomenon that lead to secondary side wave distortion, select the Hall current of model HZIA-C06
Sensor.Since rotor voltage numerical value is small, voltage sensor is directly accessed to the low frequency signal measuring device of middle member China electricity customization
In；
Step 1.4：In order to avoid occur due to rotor-side does not connect zero curve and the phenomenon that null offset occurs, by any phase with
Zero curve short circuit, then the voltage between phases value for appointing two-phase or current value are measured as corrected value, zero shift rectifying is carried out to measured signal.
The step 2 includes：
Step 2.1：Wind speed is converted by feature of wind machine simulator regulation motor rotating speed, so as to change revolutional slip s
The doubly-fed wind turbine is set to be separately operable in three kinds of different operating statuses, including synchronous regime, subsynchronous state and super
Synchronous regime.
Step 2.2：Any doubly-fed wind turbine operating status is selected, when doubly-fed wind turbine is operated in normal shape
During state, asynchronous machine is obtained with current transformer, asynchronous machine and load, transformer with bearing by current or voltage mutual inductor respectively
It carries, the rotor current of measurement point or voltage measured value, then four groups of measured values are subtracted into correction everywhere between current transformer and transformer
The signal waveform of value is sent respectively to oscillograph analytical equipment.Four groups of signal waveforms are filtered out and FFT transform by DC component
Processing respectively obtains the normal condition amplitude of sf, 3sf, 2-3sf, 2+3sf frequency everywhere；Member China electricity customization in being selected in experiment
The power failure analysis device of model ZH-2B record and monitor the operating status of doubly-fed wind turbine.
Step 2.3：Certain breaking phase light bulb carrys out the asymmetrical three-phase operation troubles of fictitious load in simulation system, obtains again
The rotor current of measurement point everywhere or voltage measured value are taken, then four groups of measured values are subtracted to the signal waveform of corrected value and are sent respectively
Oscillograph analytical equipment is given, analysis device data are stored as comtrade forms, and data are read and by four by MATLAB
Group signal waveform by DC component filter out with FFT transform processing, respectively obtain sf, 3sf, 2-3sf, 2+3sf frequency everywhere
Malfunction amplitude；
The step 3 includes：
Step 3.1：It asks for respectively under different doubly-fed wind turbine operating statuses, everywhere measurement point sf, 3sf, 2-3sf, 2
Four groups of changing values between+3sf frequency normal condition amplitudes and malfunction amplitude, then by changing value respectively divided by normal condition
Amplitude obtains change rate.
Step 3.2：Change rate maximum in sf, 3sf, 2-3sf, 2+3sf frequency in selection current transformer rotor-side measurement point
Characteristic frequency of the frequency values as diagnosis asymmetrical three-phase load faulty.
It is obtained in different situations are carried out with experiment statistics in diagnosis doubly-fed wind turbine threephase load asymmetric operation
During failure, using 3sf as doubly-fed wind turbine generic state characteristic frequency, by (2-3sf) as doubly-fed wind turbine
Synchronous regime characteristic frequency, by (2+3sf) as the supersynchronous state characteristic frequency of doubly-fed wind turbine.
As shown in Figure 4, Figure 5, subsynchronous state lower rotor part winding three-phase load asymmetric operation event during difference s=0.12
Rotor current spectrogram and supersynchronous state lower rotor part winding three-phase load asymmetric operation failure during s=-0.12 before and after barrier
Front and rear rotor current spectrogram.When understanding that double-fed wind power generator rotor winding breaks down according to Harmonic Theory, rotor-side electricity
The fault characteristic frequency of tolerance includes ksf ingredients (k=3,5,7 ...), the different motor operations obtained based on this analysis chart 4, Fig. 5
Rotor current spectrogram under state obtains the variation amplitude of ksf and its side frequency, will change apparent frequency amplitude and be organized into table
1。
As shown in Table 1, the fault characteristic frequency amplitude of rotor-side electrical quantity increases when breaking down, and the frequency at 3sf
The variation of rate amplitude is most apparent；When motor operation is in subsynchronous state, change rate of the change rate compared with (2+3sf) of frequency (2-3sf)
Greatly, fault diagnosis precision higher；When motor operation is in supersynchronous state, variation of the change rate compared with (2-3sf) of frequency (2+3sf)
Rate is big, fault diagnosis precision higher.Therefore in diagnosis double-fed wind power generator rotor winding three-phase asymmetric load operation troubles
When, it can be using 3sf as motor generic state characteristic frequency, by (2-3sf) as the subsynchronous state characteristic frequency of motor, by (2+
3sf) as the supersynchronous state characteristic frequency of motor, so as to further improve the diagnostic accuracy of the failure.
Before table 1 is of the present invention subsynchronous and supersynchronous state lower rotor part winding three-phase asymmetric load operation troubles
Different frequency variation afterwards；
The above is only the preferred embodiment of the present invention, it should be pointed out that：For the ordinary skill people of the art
For member, various improvements and modifications may be made without departing from the principle of the present invention, these improvements and modifications also should
It is considered as protection scope of the present invention.
Claims (7)
1. a kind of double-fed wind power generator rotor winding three-phase asymmetric load method for diagnosing faults, it is characterised in that：Including such as
Lower step：
Step 1：Double-fed wind power generator rotor winding failure simulation system is built on dynamic model experiment platform；
Step 2：The different conditions of motor operation are set by converting wind speed change revolutional slip, rotor is obtained based on simulation system
Side form intends the rotor current or voltage signal before and after threephase load asymmetric operation failure, and carries out different conditions lower rotor part electric current
Or voltage signal is corrected, then carries out corresponding recording using power failure analysis device, and data are read by MATLAB
And it carries out DC component and filters out and FFT transform processing；
Step 3：It analyzes normal condition and under malfunction, rotor current or voltage spectrum figure under different operating statuses obtains
The variation amplitude of ksf and its side frequency is taken, k=2n+1, n take the natural number since 1, and s is revolutional slip, and f is fundamental frequency, according to amplitude
The front and rear apparent frequency of variation of change rate extraction failure as the characteristic frequency for diagnosing the failure, sentence double-fed wind-force for disconnected and send out
Whether rotor winding occurs asymmetrical three-phase load faulty.
2. double-fed wind power generator rotor winding three-phase asymmetric load method for diagnosing faults according to claim 1,
It is characterized in that：The step 1 includes：
Step 1.1：5.5kW dc motors and 5.5kW wire-wound asynchronous motors are connected directly composition doubly-fed wind turbine
Group, dc motor provide external excitation for asynchronous machine, are controlled in real time by double-fed wind turbine excitation con-trol screen and show excitation
Size；Separately excited DC machine is directly connected to feature of wind machine simulator output terminal, and real-time reception becomes the Regulate signal of wind speed；It is different
It walks rotor one side output terminal connection rotor-side dsp controller and realizes the synchronization of double fed asynchronous machine, supersynchronous, subsynchronous shape
State transformation, another side output terminal are directly connected to load and power failure analysis device, final to access grid side DSP controls
Device is realized to be transmitted with the electric energy of power grid；The load is simulated with light bulb.
3. double-fed wind power generator rotor winding three-phase asymmetric load method for diagnosing faults according to claim 2,
It is characterized in that：The step 1 further includes：
Step 1.2：First test voltage, current transformer performance before experiment, are verified by power frequency supply, pressure regulator, multimeter
Voltage transformer and secondary side cannot short circuit, string resistance, utilizes pressure regulator, clamp on amperemeter verificating current mutual inductor in the loop
And secondary side cannot open a way；
Step 1.3：In collection voltages current signal, dc magnetization effect is generated to avoid the occurrence of low frequency signal, beyond power frequency
Mutual inductor frequency transmission range and the phenomenon that lead to secondary side wave distortion, select the Hall current sensing of model HZIA-C06
Device；Since rotor voltage numerical value is small, voltage sensor is directly accessed in the low frequency signal measuring device of middle member China electricity customization；
Step 1.4：In order to avoid occur due to rotor-side does not connect zero curve and the phenomenon that null offset occurs, by any phase and zero curve
Short circuit, then the voltage between phases value for appointing two-phase or current value are measured as corrected value, zero shift rectifying is carried out to measured signal.
4. double-fed wind power generator rotor winding three-phase asymmetric load method for diagnosing faults according to claim 1,
It is characterized in that：The step 2 includes：
Step 2.1：Wind speed converted by feature of wind machine simulator regulation motor rotating speed, is set so as to change revolutional slip s
It puts doubly-fed wind turbine to be separately operable in three kinds of different operating statuses, including synchronous regime, subsynchronous state and supersynchronous
State；
Step 2.2：Any doubly-fed wind turbine operating status is selected, when doubly-fed wind turbine is operated in normal condition
When, the rotor current of measurement point or voltage measured value between asynchronous machine and current transformer are obtained by current or voltage mutual inductor,
The signal waveform that measured value is subtracted to corrected value again is sent respectively to oscillograph analytical equipment；Signal waveform is passed through into DC component
Filter out with FFT transform processing, respectively obtain the normal condition amplitude of sf, 3sf, 2-3sf, 2+3sf frequency everywhere；
Step 2.3：Certain breaking phase light bulb carrys out the asymmetrical three-phase operation troubles of fictitious load in simulation system, obtains again different
The rotor current of measurement point or voltage measured value between motor and current transformer are walked, then measured value is subtracted to the signal waveform of corrected value
Be sent respectively to oscillograph analytical equipment, by signal waveform by DC component filter out with FFT transform processing, respectively obtain sf,
The malfunction amplitude of 3sf, 2-3sf, 2+3sf frequency everywhere.
5. double-fed wind power generator rotor winding three-phase asymmetric load method for diagnosing faults according to claim 1,
It is characterized in that：The step 3 includes：
Step 3.1：It asks for respectively under different doubly-fed wind turbine operating statuses, measurement point between asynchronous machine and current transformer
Changing value between sf, 3sf, 2-3sf, 2+3sf frequency normal condition amplitude and malfunction amplitude, then changing value is removed respectively
Change rate is obtained with normal condition amplitude；
Step 3.2：The frequency values of change rate maximum in sf, 3sf, 2-3sf, 2+3sf frequency are chosen as diagnosis asymmetrical three-phase
The characteristic frequency of load faulty.
6. double-fed wind power generator rotor winding three-phase asymmetric load method for diagnosing faults according to claim 1,
It is characterized in that：The analysis device of the model ZH-2B of member China electricity customization during the power failure analysis device uses.
7. double-fed wind power generator rotor winding three-phase asymmetric load method for diagnosing faults according to claim 5,
It is characterized in that：The step 3 further includes：
Using 3sf as doubly-fed wind turbine generic state characteristic frequency, using 2-3sf as the subsynchronous shape of doubly-fed wind turbine
State characteristic frequency, using 2+3sf as the supersynchronous state characteristic frequency of doubly-fed wind turbine.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810028861.9A CN108196187B (en) | 2018-01-11 | 2018-01-11 | Method for diagnosing three-phase asymmetric load fault of rotor winding of doubly-fed wind generator |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810028861.9A CN108196187B (en) | 2018-01-11 | 2018-01-11 | Method for diagnosing three-phase asymmetric load fault of rotor winding of doubly-fed wind generator |
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| CN108196187B CN108196187B (en) | 2020-08-25 |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109581219A (en) * | 2018-12-14 | 2019-04-05 | 广州孚鼎自动化控制设备有限公司 | A kind of brushless AC generator excitation system fault detection method |
| CN110456269A (en) * | 2019-07-01 | 2019-11-15 | 许昌许继风电科技有限公司 | A kind of wind power pitch-controlled system failure wave-recording method and oscillograph |
| CN110763995A (en) * | 2018-07-25 | 2020-02-07 | 中国石油化工股份有限公司 | Steam pressure control simulation system of steam extraction thermoelectric unit |
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