CN109524987A - A kind of doubly-fed wind turbine mutual inductance parameter identification method based on Isobarically Control - Google Patents
A kind of doubly-fed wind turbine mutual inductance parameter identification method based on Isobarically Control Download PDFInfo
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- CN109524987A CN109524987A CN201811378887.2A CN201811378887A CN109524987A CN 109524987 A CN109524987 A CN 109524987A CN 201811378887 A CN201811378887 A CN 201811378887A CN 109524987 A CN109524987 A CN 109524987A
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- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000013178 mathematical model Methods 0.000 claims abstract description 7
- 230000004907 flux Effects 0.000 claims description 3
- 239000004576 sand Substances 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
- 230000005611 electricity Effects 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000012850 discrimination method Methods 0.000 description 2
- 230000005284 excitation Effects 0.000 description 2
- 238000002474 experimental method Methods 0.000 description 2
- 241000208340 Araliaceae Species 0.000 description 1
- 235000005035 Panax pseudoginseng ssp. pseudoginseng Nutrition 0.000 description 1
- 235000003140 Panax quinquefolius Nutrition 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 235000008434 ginseng Nutrition 0.000 description 1
- 239000011159 matrix material Substances 0.000 description 1
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- 210000001258 synovial membrane Anatomy 0.000 description 1
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- H02J3/386—
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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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- 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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/40—Synchronising a generator for connection to a network or to another generator
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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
- H02P21/14—Estimation or adaptation of machine parameters, e.g. flux, current or voltage
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- 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
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Abstract
The doubly-fed wind turbine mutual inductance parameter identification method based on Isobarically Control that the invention discloses a kind of, this method are as follows: (rotor uses Motor convention according to the mathematical model of doubly-fed wind turbine, stator uses Generator convention), are adjusted by voltage error signal using double feedback electric engine constant pressure control method and picks out accurate mutual inductance parameter for network voltage and stator voltage vector oriented respectively in doubly-fed wind turbine idle grid connection control process；Identification process adjusts voltage error signal using a PI controller and controls q axis exciting current reference signal.While realizing Isobarically Control, comparison signal c, control output signal η and mutual inductance initial value L are utilizedm‑oBetween mathematical relationship pick out accurate mutual inductance value.PI control can be removed after picking out mutual inductance parameter, system is reduced and control complexity.
Description
Technical field
The doubly-fed wind turbine mutual inductance parameter identification method based on Isobarically Control that the present invention relates to a kind of
Background technique
For flexible cutting-in control and it is grid-connected after power decoupled control, the control method based on vector oriented needs electricity
Machine mutual inductance parameter obtains accurate inner ring current signal reference value, or increase a compensation controlling unit make stator voltage with
Network voltage on track.For the DFIG flexibility cutting-in control of Parameter uncertainties, although can be with using traditional voltage compensation
Realize Isobarically Control, but because the mutual inductance parameter for lacking mutual inductance parameter or inaccuracy occurs power decoupled control switching substantially
The shake of degree influences the stability of control.To solve the problems, such as that DFIG Parameter uncertainties, different parameters discrimination method are mentioned in succession
Out.Method based on double feedback electric engine descriptive equation calculating parameter does not need control identification, but needs to realize power control.Based on being
The least square objective function estimation technique of system equivalence model generally requires short-circuit three-phase stator winding or falls stator voltage, calculates
Method is complicated and operation has certain risk.Parameter identification method based on synovial membrane observer needs first to estimate that magnetic linkage could recognize
Parameter.Identification is carried out using particle swarm optimization algorithm and is also required to stator three-phase shortcircuit condition.In addition there are by solving a matrix
Integral equation obtains accurate solution, and method calculates cumbersome.Therefore, an algorithm (control) do not need simply additional identification condition with
The doubly-fed wind turbine mutual inductance parameter identification method of process more meets practical application.
Summary of the invention
The technical problem to be solved by the present invention is proposing a kind of doubly-fed wind turbine mutual inductance parameter based on Isobarically Control
Discrimination method, without establishing stator short circuit current, falling the harsh conditions such as stator voltage, without individually establishing identification process, only
Conventional constant voltage control structure is transformed and just obtains accurate mutual inductance parameter, and is also able to achieve under phase out of step conditions
Isobarically Control.
The technical scheme adopted by the invention is as follows: a kind of doubly-fed wind turbine mutual inductance parameter identification side based on Isobarically Control
Method, this method are as follows: according to the mathematical model of doubly-fed wind turbine, divide in doubly-fed wind turbine idle grid connection control process
It is other to network voltage and stator voltage vector oriented, voltage error signal is adjusted using double feedback electric engine constant pressure control method and is picked out accurately
Mutual inductance parameter.
The mathematical model of doubly-fed wind turbine includes that rotor uses Motor convention and stator using Generator convention, tool
Body Model is as follows:
In formula, vds, vqs, ids, iqsThe respectively dq axis component of stator voltage and electric current；vdr, vqr, idr, iqrRespectively turn
The dq axis component of sub- voltage and current；λds, λqs, λds, λqsThe respectively dq axis component of stator and rotor flux；Rs, RrRespectively
The resistance of stator and rotor；Lss, LrrThe respectively self-induction of stator and rotor；LmFor mutual inductance；ωs, ωrRespectively synchronous angular velocity
And rotor velocity.
Voltage error signal is adjusted using double feedback electric engine constant pressure control method and picks out accurate mutual inductance parameter are as follows: when to electricity
Net voltage and stator voltage orient respectively, and stator voltage and network voltage meet:
In formula, UgFor grid voltage amplitude (d axis orientation), UsFor stator voltage amplitude (d axis orientation), Lm-oIt is initial for mutual inductance
Value, Lm-rFor mutual inductance true value.Comparison signal c is defined according to formula (5) are as follows:
According to rotor current reference valueExcitation q shaft current reference value i is derived with formula (6)qr *Are as follows:
In formula, η is controller output signal, according to rotor current reference valueMutual inductance identification is obtained with formula (7)
Value Lm-iAre as follows:
In formula (7) and formula (8), η is not equal to 0 and initial value is 1, to guarantee the validity of numerical value calculating.
The mutual inductance parameter identification policy selection carries out d axis orientation to network voltage and stator voltage respectively, there are phases
Also it can be effectively controlled voltage when error, adjust voltage error signal to q axis exciting current reference signal using a PI controller
It is controlled, while realizing Isobarically Control, utilizes comparison signal c, control output signal η and mutual inductance initial value Lm-oBetween
Mathematical relationship pick out accurate mutual inductance value, PI control can be removed after picking out mutual inductance parameter, it is complicated to reduce system control
Degree.
The utility model has the advantages that compared with prior art, the present invention is utilized by orienting respectively to network voltage and stator voltage
Voltage error signal carries out speed constant pressure control and mutual inductance parameter identification simultaneously, without establishing stator short circuit current, falling stator
The harsh conditions such as voltage are only transformed conventional constant voltage control structure and just obtain accurately without individually establishing identification process
Mutual inductance parameter, and it is also able to achieve Isobarically Control under phase out of step conditions, it is not necessarily to stator voltage phase and network voltage phase
Mutual inductance parameter accurate recognition and Isobarically Control just can be achieved at the same time in bit synchronization, reduces the complexity of parameter identification.
Detailed description of the invention
Fig. 1 is mutual inductance parameter identification strategy block diagram；
Fig. 2 is doubly-fed wind turbine mutual inductance parameter identification block diagram；
The voltage waveform and mutual inductance parameter identification curve that Fig. 3 is mutual inductance initial value when being 100mH；
The voltage waveform and mutual inductance parameter identification curve that Fig. 4 is mutual inductance initial value when being 40mH.
Specific embodiment
Invention is described further in EXPERIMENTAL EXAMPLE with reference to the accompanying drawing and specifically.
A kind of doubly-fed wind turbine mutual inductance parameter identification method based on Isobarically Control, this method are as follows: according to double-fed wind
The mathematical model of power generator, respectively to network voltage and stator voltage in doubly-fed wind turbine idle grid connection control process
Orientation adjusts voltage error signal using double feedback electric engine constant pressure control method and picks out accurate mutual inductance parameter.
The mathematical model of doubly-fed wind turbine includes that rotor uses Motor convention and stator using Generator convention, tool
Body Model is as follows:
In formula, vds, vqs, ids, iqsThe respectively dq axis component of stator voltage and electric current；vdr, vqr, idr, iqrRespectively turn
The dq axis component of sub- voltage and current；λds, λqs, λds, λqsThe respectively dq axis component of stator and rotor flux；Rs, RrRespectively
The resistance of stator and rotor；Lss, LrrThe respectively self-induction of stator and rotor；LmFor mutual inductance；ωs, ωrRespectively synchronous angular velocity
And rotor velocity.
Voltage error signal is adjusted using double feedback electric engine constant pressure control method and picks out accurate mutual inductance parameter are as follows: when to electricity
Net voltage and stator voltage orient respectively, and stator voltage and network voltage meet:
In formula, UgFor grid voltage amplitude (d axis orientation), UsFor stator voltage amplitude (d axis orientation), Lm-oIt is initial for mutual inductance
Value, Lm-rFor mutual inductance true value.Comparison signal c is defined according to formula (5) are as follows:
According to rotor current reference valueExcitation q shaft current reference value i is derived with formula (6)qr *Are as follows:
In formula, η is controller output signal, according to rotor current reference valueMutual inductance identification is obtained with formula (7)
Value Lm-iAre as follows:
In formula (7) and formula (8), η is not equal to 0 and initial value is 1, to guarantee the validity of numerical value calculating.
The mutual inductance parameter identification strategy carries out d axis orientation to network voltage and stator voltage referring to Fig. 1, selection respectively,
There are also can be effectively controlled voltage when phase error, voltage error signal is adjusted to q axis exciting current using a PI controller
Reference signal is controlled, and while realizing Isobarically Control, utilizes comparison signal c, control output signal η and mutual inductance initial value
Lm-oBetween mathematical relationship pick out accurate mutual inductance value.PI control can be removed after picking out mutual inductance parameter, reduce system control
Complexity processed.
Embodiment 1: in control block diagram shown in Fig. 2, doubly-fed wind turbine number of pole-pairs=3, grid-connected voltage=100V (line
Voltage), grid-connected power=300W.Using filtering type excitation structure, excitation DC voltage=50V, power grid is by IPM (intelligent power
Control module) control simulation, threephase asynchronous machine is as prime mover, by rotary encoder acquisition rotor azimuth.
Fig. 3 is mutual inductance parameter identification control period, voltage waveform and mutual inductance parameter identification when mutual inductance initial value is 100mH
Curve.Stator voltage controlled as the mutual inductance parameter identification time, about completed in 65ms.And it is advanced in stator voltage phase
In the case of network voltage, stator voltage waveform and parameter identification curvilinear motion realize voltage-tracing, mutual inductance ginseng smoothly without impact
Number identifier Lm-i=52.8649mH.
Fig. 4 is mutual inductance parameter identification control period, voltage waveform and mutual inductance parameter identification when mutual inductance initial value is 40mH
Curve.Stator voltage control and mutual inductance parameter identification time are about 55ms.When there is phase error, voltage waveform and parameter
Curvilinear motion is recognized smoothly without impact, and stator voltage tracks upper network voltage, mutual inductance parameter identification value Lm-i=52.8593mH.Two
The identification result of secondary mutual inductance parameter is not slightly both since double feedback electric engine stator voltage has certain harmonic wave to cause voltage magnitude meter
Calculate slight jitter.Stator voltage THD=0.8%-1.2% is measured to obtain by power quality analyzer (C.A8335) in experiment, is reached
To the requirement less than 5%.Therefore identification result is effective, and experimental result stator voltage and network voltage maintain like width twice
Value, illustrates the high degree of accuracy of mutual inductance parameter identification.
Experiment conclusion: the DFIG mutual inductance parameter identification method proposed by the present invention based on Isobarically Control only needs a control
Mutual inductance parameter accurate recognition and Isobarically Control just can be achieved at the same time it is not necessary that stator voltage phase is synchronous with electric network voltage phase in device,
Reduce the complexity of parameter identification.
The above description is merely a specific embodiment, but scope of protection of the present invention is not limited thereto, any
Those familiar with the art in the technical scope disclosed by the present invention, can easily think of the change or the replacement, and should all contain
Within protection scope of the present invention, therefore, protection scope of the present invention should be based on the protection scope of the described claims lid.
Claims (3)
1. a kind of doubly-fed wind turbine mutual inductance parameter identification method based on Isobarically Control, it is characterised in that: this method are as follows: root
According to the mathematical model of doubly-fed wind turbine, in doubly-fed wind turbine idle grid connection control process respectively to network voltage and
Stator voltage vector oriented adjusts voltage error signal using double feedback electric engine constant pressure control method and picks out accurate mutual inductance parameter.
2. a kind of doubly-fed wind turbine mutual inductance parameter identification method based on Isobarically Control according to claim 1,
Be characterized in that: the mathematical model of doubly-fed wind turbine includes that rotor uses Motor convention and stator to use Generator convention,
Concrete model is as follows:
In formula, vds、vqs、idsAnd iqsThe respectively dq axis component of stator voltage and electric current；vdr、vqr、idrAnd iqrRespectively rotor
The dq axis component of voltage and current；λds、λqs、λdsAnd λqsThe respectively dq axis component of stator and rotor flux；RsAnd RrRespectively
The resistance of stator and rotor；LssAnd LrrThe respectively self-induction of stator and rotor；LmFor mutual inductance；ωsAnd ωrRespectively synchro angle speed
Degree and rotor velocity.
3. a kind of doubly-fed wind turbine mutual inductance parameter identification method based on Isobarically Control according to claim 1,
It is characterized in that: voltage error signal being adjusted using double feedback electric engine constant pressure control method and picks out accurate mutual inductance parameter are as follows: when right
Network voltage and stator voltage orient respectively, and stator voltage and network voltage meet:
In formula, UgFor the grid voltage amplitude of d axis orientation, UsFor the stator voltage amplitude of d axis orientation, Lm-oFor mutual inductance initial value,
Lm-rFor mutual inductance true value, comparison signal c is defined according to formula (5) are as follows:
According to rotor current reference valueExcitation q shaft current reference value i is derived with formula (6)qr *Are as follows:
In formula, η is controller output signal, according to rotor current reference valueMutual inductance identifier L is obtained with formula (7)m-i
Are as follows:
In formula (7) and formula (8), η is not equal to 0 and initial value is 1.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN115425895A (en) * | 2022-11-07 | 2022-12-02 | 成都希望电子研究所有限公司 | Method for identifying mutual inductance parameter of asynchronous motor in load state |
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| CN104300556A (en) * | 2014-10-15 | 2015-01-21 | 四川东方电气自动控制工程有限公司 | Power grid low-frequency oscillation adapting method of double-fed wind turbine system |
| CN104883112A (en) * | 2015-05-28 | 2015-09-02 | 株洲变流技术国家工程研究中心有限公司 | Asynchronous motor parameter offline identification method |
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| CN104300556A (en) * | 2014-10-15 | 2015-01-21 | 四川东方电气自动控制工程有限公司 | Power grid low-frequency oscillation adapting method of double-fed wind turbine system |
| CN104883112A (en) * | 2015-05-28 | 2015-09-02 | 株洲变流技术国家工程研究中心有限公司 | Asynchronous motor parameter offline identification method |
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Cited By (1)
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| CN115425895A (en) * | 2022-11-07 | 2022-12-02 | 成都希望电子研究所有限公司 | Method for identifying mutual inductance parameter of asynchronous motor in load state |
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