CN109039182A - A kind of resonance suppressing method and device - Google Patents
A kind of resonance suppressing method and device Download PDFInfo
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- CN109039182A CN109039182A CN201810942492.4A CN201810942492A CN109039182A CN 109039182 A CN109039182 A CN 109039182A CN 201810942492 A CN201810942492 A CN 201810942492A CN 109039182 A CN109039182 A CN 109039182A
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- 238000000034 method Methods 0.000 title claims abstract description 38
- 230000005764 inhibitory process Effects 0.000 claims abstract description 22
- 230000005611 electricity Effects 0.000 claims abstract description 16
- 239000000284 extract Substances 0.000 claims abstract description 6
- 238000000605 extraction Methods 0.000 claims description 23
- 230000001629 suppression Effects 0.000 claims description 9
- 230000000717 retained effect Effects 0.000 claims 1
- 238000005516 engineering process Methods 0.000 abstract description 2
- 230000009466 transformation Effects 0.000 description 19
- 238000010586 diagram Methods 0.000 description 8
- 230000009977 dual effect Effects 0.000 description 6
- 238000010248 power generation Methods 0.000 description 6
- 230000008569 process Effects 0.000 description 4
- 238000007667 floating Methods 0.000 description 3
- 230000002401 inhibitory effect Effects 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
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- 230000008439 repair process Effects 0.000 description 1
- 238000009774 resonance method Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P9/00—Arrangements for controlling electric generators for the purpose of obtaining a desired output
- H02P9/14—Arrangements for controlling electric generators for the purpose of obtaining a desired output by variation of field
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H02J3/386—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02P—CONTROL OR REGULATION OF ELECTRIC MOTORS, ELECTRIC GENERATORS OR DYNAMO-ELECTRIC CONVERTERS; CONTROLLING TRANSFORMERS, REACTORS OR CHOKE COILS
- H02P21/00—Arrangements or methods for the control of electric machines by vector control, e.g. by control of field orientation
- H02P21/22—Current control, e.g. using a current control loop
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
The embodiment of the present invention proposes a kind of resonance suppressing method and device, is related to power control technology field.The resonance suppressing method is applied to current transformer, current transformer and a wind-power electricity generation mechatronics, which includes: the harmonic component in the sample rate current for extract current transformer, wherein sample rate current is the electric current of wind-driven generator；Resonance inhibition is carried out according to electric current of the harmonic component extracted to wind-driven generator under α β coordinate system.The resonance suppressing method and device pass through the harmonic component extracted and carry out resonance inhibition to the electric current of wind-driven generator, to realize the function of being inhibited to the harmonic wave of low-frequency range.
Description
Technical field
The present invention relates to power control technology fields, in particular to a kind of resonance suppressing method and device.
Background technique
Wind energy is a kind of free of contamination renewable energy, reserves very abundant, in recent years, the development and utilization of wind energy by
To extensive concern.As the capacity of wind generator system is continuously increased, influence of the wind-powered electricity generation to power grid is also increasing.Especially one
A little remote districts, since farther out, transmission distance is longer apart from major network, so serial compensation capacitance can be increased in the line.In double-fed wind
In force generating system, since the equivalent inductance of serial compensation capacitance and electric wire, transformer and generator easily causes series resonance, this is humorous
Vibration belongs to subsynchronous resonance.The frequency of the subsynchronous resonance is generally several hertz to more than ten hertz, in negative damping, oscillation
It gradually dissipates, generates larger harm, be unfavorable for the safe and stable operation of power grid.
Existing resonance suppressing method can only inhibit to the harmonic wave of frequency is had determined that, the frequency of actually harmonic wave is not
One fixed value is variation, so existing solution needs first to determine the frequency of harmonic wave, and needs quickly tracking harmonic wave
Then the fluctuation of frequency carries out harmonics restraint further according to the frequency of harmonic wave.So can not quickly inhibit harmonic wave, and obtain harmonic wave frequency
The precision of rate has apparent influence to harmonic suppression effect.
Summary of the invention
The purpose of the present invention is to provide a kind of resonance suppressing method and device, this method passes through the harmonic component extracted
Resonance inhibition is carried out to the electric current of wind-driven generator, to realize the function of being inhibited to the harmonic wave of low-frequency range.
To achieve the goals above, technical solution used in the embodiment of the present invention is as follows:
In a first aspect, the embodiment of the invention provides a kind of resonance suppressing method, be applied to current transformer, the current transformer with
One wind-power electricity generation mechatronics, which comprises extract the harmonic component in the sample rate current of the current transformer, the sampling
Electric current is the electric current of the wind-driven generator；According to the harmonic component extracted to the wind-driven generator under α β coordinate system
Electric current carry out resonance inhibition.
Second aspect, the embodiment of the invention also provides a kind of resonance to inhibit device, is applied to current transformer, the current transformer
With a wind-power electricity generation mechatronics, described device includes: extraction module, humorous in the sample rate current for extracting the current transformer
Wave component, the sample rate current are the electric current of the wind-driven generator；Resonance suppression module, under α β coordinate system according to mentioning
The harmonic component taken carries out resonance inhibition to the electric current of the wind-driven generator.
A kind of resonance suppressing method and device provided in an embodiment of the present invention, by extract current transformer sample rate current in it is humorous
Then wave component carries out resonance inhibition according to electric current of the harmonic component to wind-driven generator.Resonance provided herein inhibits
Method and device is not necessarily to calculate the frequency of harmonic component in sample rate current, can be to low-frequency range (several hertz to more than ten hertz)
Harmonic component is inhibited, and compared with prior art be omitted calculate harmonic component frequency the step for, therefore have more
Fast response speed and better inhibitory effect.
To enable the above objects, features and advantages of the present invention to be clearer and more comprehensible, preferred embodiment is cited below particularly, and cooperate
Appended attached drawing, is described in detail below.
Detailed description of the invention
In order to illustrate the technical solution of the embodiments of the present invention more clearly, below will be to needed in the embodiment attached
Figure is briefly described, it should be understood that the following drawings illustrates only certain embodiments of the present invention, therefore is not construed as pair
The restriction of range for those of ordinary skill in the art without creative efforts, can also be according to this
A little attached drawings obtain other relevant attached drawings.
Fig. 1 shows the schematic diagram of the application environment of resonance suppressing method and device provided in an embodiment of the present invention；
Fig. 2 shows the flow diagrams of resonance suppressing method provided in an embodiment of the present invention；
Fig. 3 shows the sub-process schematic diagram of step S1 in Fig. 2；
Fig. 4 shows the sub-process schematic diagram of step S2 in Fig. 2；
Fig. 5 shows the control principle drawing that current transformer provided in an embodiment of the present invention carries out resonance inhibition；
Fig. 6 shows the structural schematic diagram that resonance provided in an embodiment of the present invention inhibits device.
Icon: 1- dual feedback wind power generation system；10- blower；20- wind-driven generator；30- current transformer；300- resonance inhibits
Device；310- extraction module；311- fundametal compoment extraction module；312- harmonic component extraction module；320- resonance suppression module；
321- voltage regulator module；322- harmonic component adjustment module；40- transformer；50- power grid.
Specific embodiment
Below in conjunction with attached drawing in the embodiment of the present invention, technical solution in the embodiment of the present invention carries out clear, complete
Ground description, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.Usually exist
The component of the embodiment of the present invention described and illustrated in attached drawing can be arranged and be designed with a variety of different configurations herein.Cause
This, is not intended to limit claimed invention to the detailed description of the embodiment of the present invention provided in the accompanying drawings below
Range, but it is merely representative of selected embodiment of the invention.Based on the embodiment of the present invention, those skilled in the art are not doing
Every other embodiment obtained under the premise of creative work out, shall fall within the protection scope of the present invention.
It should also be noted that similar label and letter indicate similar terms in following attached drawing, therefore, once a certain Xiang Yi
It is defined in a attached drawing, does not then need that it is further defined and explained in subsequent attached drawing.Meanwhile of the invention
In description, term " first ", " second " etc. are only used for distinguishing description, are not understood to indicate or imply relative importance.
As shown in Figure 1, the schematic diagram of the application environment for resonance method provided in an embodiment of the present invention and device, double-fed wind
Force generating system 1 includes blower 10, wind-driven generator 20, current transformer 30, transformer 40 and power grid 50, the wind-driven generator 20
It is electrically connected with the blower 10, the current transformer 30, the transformer 40, the transformer 40 passes through electric wire and the power grid
50 are electrically connected, and are in series with capacitor in the power grid 50.
In the present embodiment, due in the dual feedback wind power generation system 1, in the power grid 50 concatenated capacitor with it is described
The equivalent inductance of wind-driven generator 20, transformer 40 and electric wire easily causes series resonance, generally subsynchronous resonance, is unfavorable for
The safe and stable operation of power grid 50；And current transformer 30 provided by the embodiment of the present invention is humorous in its sample rate current by extracting
Wave component simultaneously carries out resonance inhibition according to electric current of the harmonic component to wind-driven generator 20, and then to dual feedback wind power generation system 1
Carry out resonance inhibition.
As shown in Fig. 2, for the flow diagram of resonance suppressing method provided by the embodiment of the present invention.The resonance inhibition side
Method can be applicable in current transformer 30 shown in FIG. 1, it should be noted that resonance suppressing method of the present invention not with Fig. 2 with
And specific order as described below is limitation.It should be appreciated that in other embodiments, resonance suppressing method of the present invention its
The sequence of middle part steps can be exchanged with each other according to actual needs or part steps therein also can be omitted or delete.
Detailed process shown in Fig. 2 will be described in detail below.
Step S1, extracts the harmonic component in the sample rate current of the current transformer 30, and the sample rate current is the wind-force
The electric current of generator 20.
In the present embodiment, the electric current of the wind-driven generator 20 includes rotor current or stator current.
In the present embodiment, the sample rate current of current transformer 30 includes fundametal compoment and harmonic component, and current transformer 30 can be adopted
The harmonic component in sample rate current is extracted with following two ways.
As a kind of extracting mode, as shown in figure 3, step S1 specifically includes following sub-step:
Sub-step S11 extracts the fundametal compoment in the sample rate current.
Wherein, the frequency of harmonic component is first frequency, and the frequency of fundametal compoment is second frequency.Sub-step S11 packet
It includes: Park Transformation (Park transformation, park) being carried out to the sample rate current, by the frequency of the harmonic component
Third frequency is transformed to by the first frequency, the frequency transformation of the fundametal compoment is the 4th frequency, is described the by frequency
The harmonic component of three frequencies filters out, and reserve frequency is the fundametal compoment of the 4th frequency, is described the to frequency
The fundametal compoment of four frequencies carries out Parker inverse transformation (Park inverse transformation, ipark), to obtain
Frequency is the fundametal compoment of the second frequency.
Wherein, the Park Transformation refers to α β coordinate system being converted to dq coordinate system, in the present embodiment, the Parker
Transformation can be regarded as the subtraction that 50Hz is carried out to the frequency of the sample rate current under α β coordinate system, obtain adopting under dq coordinate system
The frequency of sample electric current.Dq coordinate system is converted to α β coordinate system by the Parker inverse transformation, and the Parker inverse transformation can be understood as
The add operation that 50Hz is carried out to the frequency of the sample rate current under dq coordinate system, obtains the frequency of the sample rate current under α β coordinate system
Rate.
For example, the sample rate current of the current transformer 30 includes the harmonic component of 5Hz (i.e. first frequency) under α β coordinate system
With the fundametal compoment of 50Hz (i.e. second frequency), the fundametal compoment of harmonic component and 50Hz to 5Hz carries out Park Transformation, that is, uses
The harmonic component of 50Hz and 5Hz and the fundametal compoment of 50Hz carry out subtraction, and obtaining dq coordinate system lower frequency is 45Hz (i.e. the
Three frequencies) harmonic component and 0Hz (i.e. the 4th frequency) fundametal compoment, at this time the fundametal compoment be DC quantity；By dq coordinate
It is that the harmonic component that lower frequency is 45Hz is filtered out, reserve frequency is that the fundametal compoment of 0Hz can adopt in the present embodiment
The harmonic component that frequency is 45Hz is filtered out with low-pass filter (Low Pass Filter, LPF), reserve frequency 0Hz
Fundametal compoment；The fundametal compoment that dq coordinate system lower frequency is 0Hz is subjected to Parker inverse transformation, that is, uses the fundamental wave of 50Hz and 0Hz
Component is added, and the fundametal compoment that α β coordinate system lower frequency is 50Hz (i.e. second frequency) is obtained.
Sub-step S12 subtracts each other the sample rate current and the fundametal compoment to obtain the harmonic component.
As another extracting mode, the step S1 is specifically included: being filtered out the fundametal compoment in the sample rate current, is protected
Stay the harmonic component in the sample rate current.
In the present embodiment, can using bandstop filter to the fundametal compoment in the sample rate current of the current transformer 30 into
Row filters out, and then the harmonic component in the sample rate current of the reservation current transformer 30, to obtain the harmonic component.For example, because
Frequency for the fundametal compoment under α β coordinate system is 50Hz, and the frequency of the harmonic component is several hertz to more than ten hertz,
Therefore the bandstop filter may be configured as preventing frequency being that the fundametal compoment of 50Hz passes through, and frequency is allowed to be several hertz to more than ten
The harmonic component of hertz passes through, and then filters out the fundametal compoment, retains the harmonic component, to obtain the harmonic component.
Step S2 is carried out under α β coordinate system according to electric current of the harmonic component extracted to the wind-driven generator 20
Resonance inhibits.
In the present embodiment, because the frequency of the harmonic component is generally several hertz to more than ten hertz under α β coordinate system
Hereby, and under dq coordinate system the frequency of the harmonic component is generally thirties hertz to sixties hertz, therefore under α β coordinate system
The frequency of harmonic component under the frequency ratio dq coordinate system of harmonic component is low, and current transformer 30 has time enough to carry out resonance inhibition
Processing, so that current transformer 30 inhibits the error generated when processing smaller under α β coordinate system than carrying out resonance under dq coordinate system.
As shown in figure 4, step S2 specifically includes following sub-step:
Sub-step S21 obtains offset voltage according to the harmonic component and a setting value.
In this example, PI can be carried out to the harmonic component according to the setting value to adjust to obtain the compensation electricity
Pressure.For example, the setting value may be set to zero, the setting value and the harmonic component, which carry out subtracting each other processing, obtains difference, institute
It states difference and adjusts available offset voltage by PI.It is appreciated that since setting value is zero, therefore after PI is adjusted, make
The harmonic component obtained in the sample rate current of current transformer 30 can move closer to even equal to zero, to realize to wind-driven generator 20
Electric current carry out resonance inhibition.
Because it (is several hertz that the frequency of the harmonic component of sample rate current is relatively low in the current transformer 30 under α β coordinate system
To more than ten hertz), therefore when progress PI adjusting, it can accomplish almost floating model- following control, since PI is adjusted at (several hertz of low-frequency range
Hereby to more than ten hertz) it can accomplish almost floating model- following control, therefore available high-precision offset voltage is adjusted by PI,
And PI is adjusted and is not necessarily to very accurate frequency acquisition algorithm.
Sub-step S22 is adjusted according to output voltage of the offset voltage to the current transformer 30, obtains adjusting electricity
It presses and exports to the wind-driven generator 20, to inhibit humorous in the electric current of the wind-driven generator 20 by the adjusting voltage
Wave component.
In the present embodiment, the offset voltage and the output voltage of the current transformer 30 are handled, and obtain adjusting electricity
It presses and exports to the wind-driven generator 20.Wherein, offset voltage carries out being added processing with the output voltage of the current transformer 30,
It obtains adjusting voltage.
Because the sample rate current of the current transformer 30 is the electric current of wind-driven generator 20, and 20 basis of the wind-driven generator
The adjusting voltage of the current transformer 30 obtains exciting current, and then controls the electric current of wind-driven generator 20, and the wind-power electricity generation
The electric current of machine 20 divides two-way to be transmitted, and is transmitted to rear end transformer 40 all the way and boosts, to be transmitted to power grid 50, another way
It is transmitted to the current transformer 30 and carries out closed-loop control.Therefore the offset voltage obtained after PI is adjusted is to the adjusting electricity of current transformer 30
The adjusting of pressure can carry out resonance inhibition, i.e., in the electric current of inhibition wind-driven generator 20 to the sample rate current of the current transformer 30
Harmonic component, and then realize and the resonance in dual feedback wind power generation system 1 is inhibited.
In the following, the control principle drawing that resonance as shown in connection with fig. 5 inhibits, is provided for the embodiments of the invention resonance inhibition
Method is described further.Under α β coordinate system, respectively to the sampling of sample rate current I α and the β axis of the 30 α axis of current transformer
Electric current I β carries out resonance and inhibits control, obtains offset voltage Δ U α and Δ U β, i.e., successively carries out to the sample rate current I α of α axis respectively
Park Transformation, low-pass filtering treatment and Parker inverse transformation obtain harmonic component I α 2, then according to the harmonic component I α 2 and one
Setting value I α * obtains offset voltage Δ U α, successively carries out Park Transformation, low-pass filtering treatment and group to the sample rate current I β of β axis
Gram inverse transformation obtains harmonic component I β 2, then obtains offset voltage Δ U β according to the harmonic component I β 2 and a setting value I β *.
The control principle of the current transformer 30 is that first progress power tracking, which controls to obtain, sets idle electricity under dq coordinate system
Irq* and setting reactive current Irq* are flowed, i.e., PI adjusting is carried out according to setting active-power P * and input active-power P in d axis,
Setting watt current Ird* is obtained, PI adjusting is carried out according to setting reactive power Q * and input reactive power Q in q axis, is set
Determine reactive current Irq*；Then output voltage Ud* and Uq* under dq coordinate system are obtained further according to current follow-up control, i.e., in d axis
PI adjusting is carried out according to setting watt current Ird* and rotor current Ird, obtains output voltage Ud*, it is idle according to setting in q axis
Electric current Irq* and rotor current Irq carries out PI adjusting, obtains output voltage Uq*；Then again to the output voltage under dq coordinate system
Ud* and Uq* carries out Parker inverse transformation, obtains the output voltage U α * and U β * under α β coordinate system；Output voltage U under α β coordinate system
α * and U β * carries out being added processing with offset voltage Δ U α and Δ the U β for inhibiting control to obtain by resonance, obtains adjusting voltage U α
With U β and be transmitted to the wind-driven generator 20.
As shown in fig. 6, inhibit the structural schematic diagram of device 300 for resonance provided in an embodiment of the present invention, the resonance suppression
Device 300 processed be applied to Fig. 1 in current transformer 30, it should be noted that resonance provided by the present embodiment inhibit device 300 its
Basic principle and the technical effect of generation are identical as preceding method embodiment, to briefly describe, do not refer to part in the present embodiment,
It can refer to the corresponding contents in preceding method embodiment.It includes that extraction module 310 and resonance inhibit that the resonance, which inhibits device 300,
Module 320.
The extraction module 310 is used to extract the harmonic component in the sample rate current of the current transformer 30, the sampling electricity
Stream is the rotor current of the wind-driven generator 20.
It is appreciated that the extraction module 310 can execute above-mentioned steps S1.
In the present embodiment, the extraction module 310 includes fundametal compoment extraction module 311 and harmonic component extraction module
312.The fundametal compoment extraction module 311 is used to extract the fundametal compoment in the sample rate current；The harmonic component extraction
Module 312 is used to subtract each other the sample rate current and the fundametal compoment to obtain the harmonic component.
It is appreciated that the fundametal compoment extraction module 311 can execute above-mentioned steps S11, the harmonic component extraction
Module 312 can execute above-mentioned steps S12.
In the present embodiment, the frequency of the harmonic component is first frequency, and the frequency of the fundametal compoment is the second frequency
Rate, the fundametal compoment extraction module 311 is used to carry out Park Transformation to the sample rate current, by the frequency of the harmonic component
Third frequency is transformed to by the first frequency, the frequency transformation of the fundametal compoment is the 4th frequency；It is described the by frequency
The harmonic component of three frequencies filters out, and reserve frequency is the fundametal compoment of the 4th frequency；It is described the to frequency
The fundametal compoment of four frequencies carries out Parker inverse transformation, to obtain the fundametal compoment that frequency is the second frequency.
In another embodiment, the extraction module 310 is used to filter out the fundametal compoment in the sample rate current, retains institute
State the harmonic component in sample rate current.
The resonance suppression module 320 is for sending out the wind-force according to the harmonic component extracted under α β coordinate system
The electric current of motor 20 carries out resonance inhibition.
It is appreciated that the resonance suppression module 320 can execute above-mentioned steps S2.
In the present embodiment, the resonance suppression module 320 includes harmonic component adjustment module 322 and voltage regulator module
321, the harmonic component adjustment module 322 is used to obtain offset voltage according to the harmonic component and a setting value；The electricity
Pressure adjustment module 321 obtains adjusting electricity for being adjusted according to output voltage of the offset voltage to the current transformer 30
It presses and exports to the wind-driven generator 20, to inhibit humorous in the electric current of the wind-driven generator 20 by the adjusting voltage
Wave component.
It is appreciated that the harmonic component adjustment module 322 can execute above-mentioned steps S21, the voltage regulator module
321 can execute above-mentioned steps S22.
In the present embodiment, the harmonic component adjustment module 322 is used for according to the setting value to the harmonic component
PI is carried out to adjust to obtain the offset voltage.
In conclusion resonance suppressing method and device provided by the present embodiment, first in the sample rate current of extraction current transformer
Then harmonic component carries out a setting value and the harmonic component to subtract each other processing obtaining a difference, carries out PI adjusting to the difference,
Offset voltage is obtained, then the output voltage of current transformer is carried out to be added processing with the offset voltage, obtains adjusting voltage and defeated
Out to the wind-driven generator.
Because the sample rate current of current transformer is the electric current of wind-driven generator, pass through the harmonic wave in the sample rate current to current transformer
Component extraction is equivalent to the harmonic component extraction in dual feedback wind power generation system, can adopting current transformer by PI adjusting
Harmonic component is adjusted to identical as setting value in sample electric current, and setting value is set as zero in the present embodiment, therefore by the unsteady flow
The harmonic component of sample rate current is adjusted to zero in device, and the harmonic component of sample rate current is zero in the current transformer, i.e., the described double-fed
Harmonic component is also zero in wind generator system, and then realizes the inhibition to harmonic component in the dual feedback wind power generation system.
The low-frequency range that the frequency of the harmonic component of sample rate current is several hertz to more than ten hertz in the current transformer under α β coordinate system, therefore
When carrying out PI adjusting, it can accomplish almost floating model- following control, therefore can be to the humorous of low-frequency range (several hertz to more than ten hertz)
Wave component carries out inhibition control, wherein the frequency of the harmonic component of the low-frequency range can be a fixed value, or one
The value of real-time change can also be the value of variation in a set time.Because being adjusted using PI, without very accurate
Frequency acquisition algorithm.Compared with prior art, the step for frequency for calculating harmonic component is omitted in the application, directly to humorous
Wave component carries out inhibition control, therefore has faster response speed and better inhibitory effect.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
The foregoing is only a preferred embodiment of the present invention, is not intended to restrict the invention, for the skill of this field
For art personnel, the invention may be variously modified and varied.All within the spirits and principles of the present invention, made any to repair
Change, equivalent replacement, improvement etc., should all be included in the protection scope of the present invention.It should also be noted that similar label and letter exist
Similar terms are indicated in following attached drawing, therefore, once being defined in a certain Xiang Yi attached drawing, are then not required in subsequent attached drawing
It is further defined and explained.
Claims (10)
1. a kind of resonance suppressing method is applied to current transformer, the current transformer and a wind-power electricity generation mechatronics, feature exist
In, which comprises
The harmonic component in the sample rate current of the current transformer is extracted, the sample rate current is the electric current of the wind-driven generator；
Resonance inhibition is carried out according to electric current of the harmonic component extracted to the wind-driven generator under α β coordinate system.
2. resonance suppressing method as described in claim 1, which is characterized in that it is described under α β coordinate system according to extract described in
The step of harmonic component carries out resonance inhibition to the electric current of the wind-driven generator include:
Offset voltage is obtained according to the harmonic component and a setting value；
It is adjusted, obtains adjusting voltage and is exported to the wind according to output voltage of the offset voltage to the current transformer
Power generator, to inhibit the harmonic component in the electric current of the wind-driven generator by the adjusting voltage.
3. resonance suppressing method as claimed in claim 2, which is characterized in that described according to the harmonic component and a setting value
The step of obtaining offset voltage include:
PI is carried out to the harmonic component according to the setting value to adjust to obtain the offset voltage.
4. resonance suppressing method as described in claim 1, which is characterized in that the electric current of the wind-driven generator includes rotor electricity
Stream or stator current.
5. resonance suppressing method as described in claim 1, which is characterized in that the sample rate current includes fundametal compoment and harmonic wave
The step of component, harmonic component in the sample rate current for extracting the current transformer includes:
Extract the fundametal compoment in the sample rate current；
Subtract each other the sample rate current and the fundametal compoment to obtain the harmonic component.
6. resonance suppressing method as described in claim 1, which is characterized in that in the sample rate current for extracting the current transformer
Harmonic component the step of include:
The fundametal compoment in the sample rate current is filtered out, the harmonic component in the sample rate current is retained.
7. a kind of resonance inhibits device, it is applied to current transformer, the current transformer and a wind-power electricity generation mechatronics, feature exist
In described device includes:
Extraction module, the harmonic component in sample rate current for extracting the current transformer, the sample rate current are the wind-force
The electric current of generator；
Resonance suppression module, under α β coordinate system according to the harmonic component extracted to the electric current of the wind-driven generator
Carry out resonance inhibition.
8. resonance as claimed in claim 7 inhibits device, which is characterized in that the resonance suppression module includes:
Harmonic component adjustment module, for obtaining offset voltage according to the harmonic component and a setting value；
Voltage regulator module is adjusted for being adjusted according to output voltage of the offset voltage to the current transformer
Voltage is simultaneously exported to the wind-driven generator, to inhibit the harmonic wave in the electric current of the wind-driven generator by the adjusting voltage
Component.
9. resonance as claimed in claim 8 inhibits device, which is characterized in that the harmonic component adjustment module is used for according to institute
It states setting value harmonic component progress PI is adjusted to obtain the offset voltage.
10. resonance as claimed in claim 7 inhibits device, which is characterized in that the sample rate current includes fundametal compoment harmony
Wave component, the extraction module include:
Fundametal compoment extraction module, for extracting the fundametal compoment in the sample rate current；
Harmonic component extraction module, for subtracting each other the sample rate current and the fundametal compoment to obtain the harmonic component.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810942492.4A CN109039182A (en) | 2018-08-17 | 2018-08-17 | A kind of resonance suppressing method and device |
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