CN107436176A - Determine the method and device of double-fed wind power generator system eigentone - Google Patents
Determine the method and device of double-fed wind power generator system eigentone Download PDFInfo
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- G01—MEASURING; TESTING
- G01H—MEASUREMENT OF MECHANICAL VIBRATIONS OR ULTRASONIC, SONIC OR INFRASONIC WAVES
- G01H11/00—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties
- G01H11/06—Measuring mechanical vibrations or ultrasonic, sonic or infrasonic waves by detecting changes in electric or magnetic properties by electric means
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Abstract
The invention discloses a kind of method and device for determining double-fed wind power generator system eigentone, this method includes the change blade angle degree of control double-fed wind power generator system, makes the stabilization of speed of generator amature in the tachometer value of setting；The rotating speed of rotor is detected while adjusting the exciting current frequency of rotor, extraction characterizes the signal of generator mechanical vibration from the rotating speed, and judges whether the mechanical oscillation of the stator of generator and the electric and magnetic oscillation of rotor and generator resonate according to the signal；The frequency of the voltage exported according to stator when resonating determines the eigentone of double-fed wind power generator system.This method need not increase sensor, simplify system composition, saved cost.Meanwhile the control algolithm is simple, reliable, it is easy to engineering and realizes.
Description
Technical field
The invention belongs to technical field of wind power generation, more particularly to a kind of determination double-fed wind power generator system are intrinsic
The method and device of vibration frequency.
Background technology
Wind-power electricity generation as it is a kind of do not pollute, the environment-friendly type generation mode using renewable resource, turn into and most send out
Open up one of renewable energy technologies of potentiality.Turn into the focus and emphasis that has competitively developed of countries in the world, before market
Scape is wide.With wind electric generating set quantity increase and the increase of capacity, blower fan quality problems are increasingly
Prominent, as the generator of blower fan critical component, its reliability is more exposed to vast wind-powered electricity generation owner, correlation technique
Research staff payes attention to.
The vibration of wind-driven generator can lower generator efficiency, accelerate bearing wear, loosen generator and fix member
Part etc., ultimately causes security incident, turn into influence its reliability an important factor for.Cause wind-power electricity generation machine vibration
The reason for varied, such as imbalance when generator is installed, the bearing caused by heat run
Deformation and grease deterioration or due to generator unit stator, rotor field interaction and the periodicity that triggers
Electromagnetic force, can also react in the mechanical oscillation of generator movable part.And most of double-fed wind power generator
It is mostly installed on the resilient support platform in the fan cabin cover of high-altitude, therefore is more easy to trigger violent vibration.
At present, determine that the method for the eigentone of double-fed wind power generator system is mainly based upon acceleration biography
The detection of sensor, not only increase the cost of system.And most of sensors are all based on the algorithm progress of complexity
Modeling, therefore be difficult engineering application.
To sum up, one kind is needed badly without acceleration transducer to determine double-fed wind power generator system eigentone
Method to solve the above problems.
The content of the invention
One of technical problems to be solved by the invention are to need to provide one kind without acceleration transducer to determine
The method of double-fed wind power generator system eigentone.
In order to solve the above-mentioned technical problem, embodiments herein provide firstly a kind of determination double-fed wind generating
The method of machine system eigentone, include the change blade angle degree of control double-fed wind power generator system, make generating
Tachometer value of the stabilization of speed of machine rotor in setting；Rotor is detected while adjusting the exciting current frequency of rotor
Rotating speed, extraction characterizes the signal of generator mechanical vibration from the rotating speed, and judges to generate electricity according to the signal
Whether the mechanical oscillation of the stator of machine and the electric and magnetic oscillation of rotor and generator resonate；During according to resonating
The frequency of voltage of stator output determine the eigentone of double-fed wind power generator system.
Preferably, the change blade angle degree of double-fed wind power generator system is being controlled, is making the stabilization of speed of generator amature
Also include the connection for disconnecting double-fed wind power generator system and power network before the tachometer value of setting.
Preferably, characterizing the signal of generator mechanical vibration includes the harmonic component signal of 1 times of line voltage frequency.
Preferably, extraction characterizes the signal of generator mechanical vibration from the rotating speed, including：Utilize trapper
The harmonic component signal for filtering out 1 times of line voltage frequency in the rotating speed obtains other harmonic component signals；With institute
State rotating speed and subtract the signal that other described harmonic component signals obtain characterizing generator mechanical vibration.
Preferably, the stator of generator and the machinery of the electric and magnetic oscillation of rotor and generator are judged according to the signal
Whether vibration resonates, including：Set when the peak value of the signal of the sign generator mechanical vibration is more than or equal to
During fixed boundary value, then judge that the mechanical oscillation of the stator of generator and the electric and magnetic oscillation of rotor and generator occur
Resonance；When the peak value of the signal of the sign generator mechanical vibration is less than the boundary value of setting, re-adjustments
The exciting current frequency of rotor and rotating speed based on rotor judge the stator of generator and the electric and magnetic oscillation of rotor
Whether the mechanical oscillation with generator resonate.
Preferably, the frequency of the voltage exported according to stator when resonating determines double-fed wind power generator system
Eigentone, including：Establish the rotating speed of rotor, the exciting current frequency of rotor and stator output
The relational model of the frequency of voltage；The frequency for the voltage that stator exports when determining to resonate according to the model,
And the frequency is defined as to the eigentone of double-fed wind power generator system.
Preferably, to establish the rotating speed of rotor, the exciting current frequency of rotor and stator according to following expression defeated
The relational model of the frequency of the voltage gone out：
Wherein, f1For the frequency of the voltage of stator output, f2For the exciting current frequency of rotor, nrFor rotor
Rotating speed, p are the number of pole-pairs of generator.
Preferably, the exciting current frequency of rotor is adjusted using current transformer.
Preferably, the tachometer value of setting is chosen according to the number of pole-pairs of generator, if number of pole-pairs is 3, sets
The scope of fixed tachometer value is 700-900r/min；If number of pole-pairs is 2, the scope of the tachometer value set as
1200-1400r/min。
Embodiments herein additionally provides a kind of dress for determining double-fed wind power generator system eigentone
Put, including：Rotation speeds setting module, it controls the change blade angle degree of double-fed wind power generator system, turns generator
Tachometer value of the stabilization of speed of son in setting；Rotational speed regulation and detection module, it adjusts the exciting current frequency of rotor
The rotating speed of rotor is detected while rate, the signal of extraction sign generator mechanical vibration from the rotating speed, and root
Whether the mechanical oscillation for judging the stator of generator and the electric and magnetic oscillation of rotor and generator according to the signal occur
Resonance；Frequency determining module, the frequency of its voltage exported according to stator when resonating determine double-fed wind-force
The eigentone of generator system.
Compared with prior art, one or more of such scheme embodiment can have the following advantages that or beneficial
Effect：
By adjusting the exciting current frequency of rotor, and the rotating speed of rotor during based on electromagentic resonance, rotor are encouraged
The relational model of the frequency of magnetic power frequency and the voltage of stator output determines double-fed wind power generator system
Eigentone, without increasing sensor, simplify system composition, saved cost.Meanwhile the control
Algorithm processed is simple, reliable, is easy to engineering and realizes.
Other advantages, the target of the present invention, and feature will be explained in the following description to a certain extent
State, and to a certain extent, based on will be to those skilled in the art to investigating hereafter it is aobvious and
It is clear to, or can be instructed from the practice of the present invention.The target and other advantages of the present invention can lead to
Cross following specification, specifically noted structure is realized and obtained in claims, and accompanying drawing.
Brief description of the drawings
Accompanying drawing is used for providing to the technical scheme of the application or further understanding for prior art, and forms explanation
A part for book.Wherein, the accompanying drawing for expressing the embodiment of the present application is used to explain this together with embodiments herein
The technical scheme of application, but do not form the limitation to technical scheme.
Fig. 1 is the method according to the determination double-fed wind power generator system eigentone of one embodiment of the invention
Schematic flow sheet；
Fig. 2 is the principle schematic of double-fed wind power generator；
Fig. 3 is the dress according to the determination double-fed wind power generator system eigentone of another embodiment of the present invention
The structural representation put.
Embodiment
Describe embodiments of the present invention in detail below with reference to drawings and Examples, whereby to the present invention how
Application technology means solve technical problem, and the implementation process of reaching relevant art effect can be fully understood and evidence
To implement.Each feature in the embodiment of the present application and embodiment, can mutually be tied under the premise of not colliding
Close, the technical scheme formed is within protection scope of the present invention.
The reason for causing wind-driven generator to produce vibration includes mechanical oscillation and vibrated with electromagnetic force.If stator, turn
The electromagnetic vibratory dynamic frequency of the mechanical oscillation frequencies of handset tool inherently and stator, rotor core approaches, and may be used also
Electromagentic resonance can occur.A kind of double-fed wind power generator system based on electromagentic resonance is proposed in embodiments of the invention
The detection method for eigentone of uniting, as shown in figure 1, this method includes：
Step S110, the change blade angle degree of double-fed wind power generator system is controlled, makes the stabilization of speed of generator amature
In the tachometer value of setting.
Step S120, the rotating speed of rotor is detected while the exciting current frequency for adjusting rotor, is carried from the rotating speed
The signal for characterizing generator mechanical vibration is taken, and the signal obtained according to extraction judges the stator and rotor of generator
Electric and magnetic oscillation and the mechanical oscillation of generator whether resonate.
Step S130, the frequency of the voltage exported according to stator when resonating determines double-fed wind power generator system
The eigentone of system.
In step s 110, in the rotating speed for becoming blade angle degree, stable rotor of control double-fed wind power generator system
The connection of disconnection double-fed wind power generator system and power network is needed before, even if generator exits the shape to generate electricity by way of merging two or more grid systems
State.Next, controlling the change blade angle degree of double-fed wind power generator using the control system of Wind turbines, make generating
The stabilization of speed of machine rotor is on the tachometer value of setting.
The tachometer value of the setting is generally the synchronous rotational speed of low generator, can be carried out according to the number of pole-pairs of generator
Choose.For example, if number of pole-pairs is 3, the scope of the tachometer value set is 700-900r/min, if pole
Logarithm is 2, then the scope of the tachometer value set is 1200-1400r/min.
Because double-fed wind power generator is directly connected to power network, and the stator of generator must exist to power network frequency of delivery
Electric energy near 50Hz, while the electric energy frequency of the rotor of generator is also fixed as the 1/s of stator frequency, s is
The revolutional slip of generator, so the electric and magnetic oscillation frequency of the stator of generator, rotor core is substantially stationary.It is i.e. fixed
The electric and magnetic oscillation frequency of sub- iron core can only be near 50Hz, and the electric and magnetic oscillation frequency of rotor core is generally
0~15Hz.And because the encoder of generator is fixed on alternator shaft, therefore the electric and magnetic oscillation of stator core
Frequency can be added on the tach signal of generator amature.
In the step s 120, while adjusting the exciting current frequency of rotor using the current transformer for being arranged at rotor-side,
While detecting the rotating speed of rotor, and the harmonic component signal of 1 times of line voltage frequency is extracted from the rotating speed of rotor
To characterize the mechanical oscillation of the generator under electromagnetic force.
Specifically, filtering out the harmonic component signal of 1 times of line voltage frequency in the rotating speed using trapper, obtain
To after other harmonic component signals, then other harmonic component signals are subtracted with the tach signal and obtain characterizing generator
The signal of mechanical oscillation.In one embodiment of the invention, the transmission function of used trapper is as expressed
Shown in formula (1)：
In formula, ω0For the angular frequency of trapper, Q is quality factor.Work as ω0, can when=50Hz, Q=0.707
Filter out the harmonic component signal of 50Hz in tach signal.
, will if the mechanical oscillation of the stator of generator and the electric and magnetic oscillation of rotor and generator are resonated
Cause the violent vibration of generator, therefore the peak value for characterizing the signal of generator mechanical vibration will become big, so,
When characterizing the peak value of signal of generator mechanical vibration more than or equal to the boundary value set, then generator is judged
The mechanical oscillation of the electric and magnetic oscillation and generator of stator and rotor are resonated.Wherein, the boundary value of setting is general
Determined according to the amplitude of the signal of sign generator mechanical vibration when not resonating, such as can be by 5 times
The amplitude of the signal of sign generator mechanical vibration when not resonating is defined as the boundary value of setting.
When characterizing the peak value of signal of generator mechanical vibration less than the boundary value set, illustrate now generator
Stator and the mechanical oscillation of electric and magnetic oscillation and generator of rotor do not resonate, then re-adjustments rotor is encouraged
Magnetic power frequency and tach signal based on rotor judge the stator of generator and the electric and magnetic oscillation of rotor and hair
The process whether mechanical oscillation of motor resonate, until electromagentic resonance occurs for system.
In step s 130, the rotating speed of rotor, the exciting current frequency of rotor and stator output are initially set up
Voltage frequency relational model.Stator output when then determining to resonate according to obtained relational model
The frequency of voltage, the frequency of the voltage of stator output is the intrinsic vibration frequency of double-fed wind power generator system
Rate.
Specifically, Fig. 2 is the principle schematic of double-fed wind power generator, as illustrated, f1And f2Represent respectively
The frequency of voltage and the exciting current frequency of rotor of the stator output of double-fed wind power generator.n1For stator magnet
The rotating speed of field, i.e. synchronous rotational speed.n2Rotating speed for rotor field relative to rotor, nrFor double-fed wind power generator
The rotating speed of rotor, the number of pole-pairs of p generators.
When double-fed wind power generator stable operation, its stator, the rotating excitation field geo-stationary of rotor, i.e. n1、
n2And nrWith the relation as shown in expression formula (2)：
n1=n2+nr (2)
And due to f1=n1P/60, f2=n2P/60, then have：
It was found from expression formula (3), as the rotating speed n of generator amaturerWhen not changing, by adjusting encouraging for rotor
Magnetic power frequency f2The electric voltage frequency f of stator output can be changed1, i.e., pass through regulation in an embodiment of the present invention
The exciting current frequency of rotor obtains the electric voltage frequency of the output of different stator cores, and then causes determining for motor
It is feasible that resonance, which occurs, for the mechanical oscillation of son and the electric and magnetic oscillation and generator of rotor.
When the mechanical oscillation of the stator of generator and the electric and magnetic oscillation of rotor and generator are resonated, further
The eigentone f of double-fed wind power generator system is calculated according to expression formula (3)n=nrp/60+f2',
Wherein f2' for resonate when rotor exciting current frequency, fnIntrinsic for double-fed wind power generator system shakes
Dynamic frequency.
Embodiments of the invention propose excitation that is a kind of based on electromagentic resonance, and using current transformer regulation rotor
Power frequency determines the method for double-fed wind power generator system eigentone.It is included in double-fed wind generating
Before machine does not connect power network, by adjusting the exciting current frequency of rotor, make the voltage of generator unit stator output
Frequency certain limit change, produce stator core electromagnetic force vibration.The rotating speed letter of generator is detected simultaneously
Number, judge whether to resonate with stator, the mechanical intrinsic frequency of of rotor itself, if it happens resonate, then root
Calculated according to the relational model of the frequency of the voltage of the rotating speed of rotor, the exciting current frequency of rotor and stator output
Obtain the eigentone of double-fed wind power generator system.
The method of the embodiment of the present invention need not gather way sensor, save system cost.Meanwhile the control
Algorithm is simple, reliable, and easily engineering is realized.
A kind of determination double-fed wind power generator system intrinsic vibration is also proposed in another embodiment of the present invention
The device of frequency, as shown in figure 3, the device includes：
Rotation speeds setting module 31 performs the operation of step S110 in previous embodiment, rotational speed regulation and detection module
32 perform the operation of step S120 in previous embodiment, and frequency determining module 33 performs step in previous embodiment
S130 operation, here is omitted.
Although disclosed herein embodiment as above, described content only to facilitate understand the present invention
And the embodiment used, it is not limited to the present invention.Technology people in any the technical field of the invention
Member, do not depart from disclosed herein spirit and scope on the premise of, can be in the formal and details of implementation
On make any modification and change, but the scope of patent protection of the present invention still must be with appended claims institute
The scope defined is defined.
Claims (10)
1. a kind of method for determining double-fed wind power generator system eigentone, including：
The change blade angle degree of double-fed wind power generator system is controlled, the stabilization of speed of generator amature is turned in setting
Speed value；
The rotating speed of rotor is detected while adjusting the exciting current frequency of rotor, extraction, which characterizes, from the rotating speed sends out
The signal of electromechanics vibration, and the stator of generator and the electric and magnetic oscillation of rotor and hair are judged according to the signal
Whether the mechanical oscillation of motor resonate；
The frequency of the voltage exported according to stator when resonating determines the intrinsic of double-fed wind power generator system
Vibration frequency.
2. according to the method for claim 1, it is characterised in that in control double-fed wind power generator system
Change blade angle degree, make the stabilization of speed of generator amature also include disconnecting double-fed wind-force before the tachometer value of setting
The connection of generator system and power network.
3. according to the method for claim 2, it is characterised in that described to characterize what generator mechanical was vibrated
Signal includes the harmonic component signal of 1 times of line voltage frequency.
4. according to the method for claim 3, it is characterised in that described extracted from the rotating speed characterizes
The signal of generator mechanical vibration, including：
The harmonic component signal that 1 times of line voltage frequency in the rotating speed is filtered out using trapper obtains other harmonic waves
Component signal；
Other described harmonic component signals are subtracted with the rotating speed and obtain the signal of sign generator mechanical vibration.
5. according to the method for claim 4, it is characterised in that described to judge to generate electricity according to the signal
Whether the mechanical oscillation of the stator of machine and the electric and magnetic oscillation of rotor and generator resonate, including：
When the peak value of the signal of the sign generator mechanical vibration is more than or equal to the boundary value of setting, then judge
The mechanical oscillation of the stator of generator and the electric and magnetic oscillation of rotor and generator are resonated；
When the peak value of the signal of the sign generator mechanical vibration is less than the boundary value of setting, re-adjustments turn
The exciting current frequency and rotating speed based on rotor of son judge the stator of generator and the electric and magnetic oscillation of rotor and
Whether the mechanical oscillation of generator resonate.
6. method according to any one of claim 1 to 5, it is characterised in that described according to generation
The frequency of the voltage of stator output during resonance determines the eigentone of double-fed wind power generator system, bag
Include：
Establish the relation mould of the frequency of the voltage of the rotating speed of rotor, the exciting current frequency of rotor and stator output
Type；
The frequency for the voltage that stator exports when determining to resonate according to the model, and the frequency is defined as
The eigentone of double-fed wind power generator system.
7. according to the method for claim 6, it is characterised in that rotor is established according to following expression
The relational model of the frequency of the voltage of rotating speed, the exciting current frequency of rotor and stator output：
<mrow>
<msub>
<mi>f</mi>
<mn>1</mn>
</msub>
<mo>=</mo>
<mfrac>
<mrow>
<msub>
<mi>n</mi>
<mi>r</mi>
</msub>
<mi>p</mi>
</mrow>
<mn>60</mn>
</mfrac>
<mo>+</mo>
<msub>
<mi>f</mi>
<mn>2</mn>
</msub>
</mrow>
Wherein, f1For the frequency of the voltage of stator output, f2For the exciting current frequency of rotor, nrFor rotor
Rotating speed, p are the number of pole-pairs of generator.
8. according to the method for claim 7, it is characterised in that the excitation of rotor is adjusted using current transformer
Power frequency.
9. according to the method for claim 1, it is characterised in that the tachometer value of the setting is according to generating
The number of pole-pairs of machine is chosen, if number of pole-pairs is 3, the scope of the tachometer value set is 700-900r/min；
If number of pole-pairs is 2, the scope of the tachometer value set is 1200-1400r/min.
10. a kind of device for determining double-fed wind power generator system eigentone, including：
Rotation speeds setting module, it controls the change blade angle degree of double-fed wind power generator system, makes turning for generator amature
The stable tachometer value in setting of speed；
Rotational speed regulation and detection module, it detects the rotating speed of rotor while adjusting the exciting current frequency of rotor,
Extraction characterizes the signal of generator mechanical vibration from the rotating speed, and judges determining for generator according to the signal
Whether the mechanical oscillation of son and the electric and magnetic oscillation and generator of rotor resonate；
Frequency determining module, the frequency of its voltage exported according to stator when resonating determine that double-fed wind-force is sent out
The eigentone of electric system.
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| CN201610355737.4A CN107436176B (en) | 2016-05-25 | 2016-05-25 | Method and device for determining natural vibration frequency of doubly-fed wind generator system |
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| CN201610355737.4A CN107436176B (en) | 2016-05-25 | 2016-05-25 | Method and device for determining natural vibration frequency of doubly-fed wind generator system |
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| US20100198534A1 (en) * | 2009-01-30 | 2010-08-05 | Roger Hala | System and method for monitoring the condition of a gear assembly |
| US20120154202A1 (en) * | 2010-12-16 | 2012-06-21 | Steven Go | Sensor Assembly And Method Of Measuring The Proximity Of A Machine Component To An Emitter |
| CN103321854A (en) * | 2013-05-29 | 2013-09-25 | 国家电网公司 | Vibration control method for wind generator set tower |
| CN105403402A (en) * | 2015-11-12 | 2016-03-16 | 科诺伟业风能设备（北京）有限公司 | Method for monitoring torsional vibration state of driving chain system of wind generating set |
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2016
- 2016-05-25 CN CN201610355737.4A patent/CN107436176B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20100198534A1 (en) * | 2009-01-30 | 2010-08-05 | Roger Hala | System and method for monitoring the condition of a gear assembly |
| US20120154202A1 (en) * | 2010-12-16 | 2012-06-21 | Steven Go | Sensor Assembly And Method Of Measuring The Proximity Of A Machine Component To An Emitter |
| CN103321854A (en) * | 2013-05-29 | 2013-09-25 | 国家电网公司 | Vibration control method for wind generator set tower |
| CN105403402A (en) * | 2015-11-12 | 2016-03-16 | 科诺伟业风能设备（北京）有限公司 | Method for monitoring torsional vibration state of driving chain system of wind generating set |
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