CN106230031B - The control method of the mixing wind farm group of wind power plant containing permanent magnet direct-drive and asynchronous wind power plant under unbalanced source voltage - Google Patents
The control method of the mixing wind farm group of wind power plant containing permanent magnet direct-drive and asynchronous wind power plant under unbalanced source voltage Download PDFInfo
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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
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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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
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase 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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The invention discloses the control methods of the mixing wind farm group of wind power plant containing permanent magnet direct-drive under a kind of unbalanced source voltage and asynchronous wind power plant, this method is not premised on adding hardware device, the negative-sequence current allowance and its phase angle characteristics for making full use of permanent magnet direct-drive wind power system grid side converter, relate generally to the control to permanent magnet direct-drive wind power system machine-side converter and grid side converter.Meet the negative-sequence current of amplitude and phase angle requirement to power grid injection by control permanent magnet direct-drive wind power plant, the voltage unbalance factor of wind farm grid-connected point can farthest be reduced, to reduce the power and torque ripple of the asynchronous wind power plant being connected directly with power grid, asynchronous wind power plant and the safe and stable operation ability of the mixing wind farm group are improved.
Description
Technical field
The present invention relates to the technological improvements of the mixing wind farm group of wind power plant containing permanent magnet direct-drive and asynchronous wind power plant, especially
It is related to the method that the mixing wind power plant under unbalanced electric grid voltage effectively inhibits grid entry point negative sequence voltage components, belongs to Electric control
Technical field.
Background technology
Since different types of Wind turbines respectively have feature, in old wind power plant extending capacity reformation and new wind farm are built, profit
Mixing wind power plant is formed with different type Wind turbines and has been extensive using the mutually coordinated operation of different type Wind turbines
One of the important trend that wind-powered electricity generation utilizes.Since China's wind power resources have focused largely on remote districts, by line impedance asymmetry, no
Unbalanced source voltage happens occasionally caused by the factors such as symmetrical short-circuit failure, this is by the stable operation to grid-connected Large Scale Wind Farm Integration
It makes a significant impact.In common wind generator system, asynchronous Wind turbines are directly connected with power grid, and controllability is poor, by
Unbalanced electric grid voltage is affected, on the one hand, uneven stator current will cause generator windings to overheat and generate additional damage
Consumption, may cause winding insulation to damage, and on the other hand, the interaction of the positive and negative sequence voltage of stator and electric current will cause electromagnetism to turn
There is the pulsation of two frequencys multiplication in square, to reduce the service life of shaft system of unit.Currently, to improve asynchronous wind power plant in face of uneven electricity
The adaptability of net voltage, domestic and foreign scholars have expanded correlative study, such as published following documents：
(1) Tian Guizhen, Wang Shengtie, cage modle machine wind power plant STATCOM control strategies under the unbalanced source voltages such as Pang Yang
Study [J] regenerative resources, 2016,34 (1)：30-37.
(2)Andres E.Leon,Marcelo F.Farias,Pedro E.Battaiotto,Jorge A.Solsona,
and Maria Inés Valla.Control strategy ofa DVR to improve stability in wind
farms using squirrel-cage induction generators[J].IEEE Transactions on Power
Systems,2011,26(3):1609-1617.
(3)Yi Wang and Lie Xu.Coordinated control of DFIG and FSIG-based wind
farms under unbalanced grid conditions[J].IEEE Transactions on Power
Delivery,2010,25(1):367-377.
Document (1) proposes to press down by controlling static synchronous compensator (STATCOM) to the idle negative-sequence current of power grid injection
The negative sequence voltage of wind-electricity integration point processed, to reduce asynchronous wind farm grid-connected voltage unevenness, however analysis is found, is directly noted
Enter idle negative-sequence current, under identical negative-sequence current amplitude, the voltage unbalance factor of wind farm grid-connected point can not be suppressed to
Minimum point can even cause the voltage unbalance factor to increase in some cases.
Document (2) proposes the control that asynchronous wind farm grid-connected voltage is compensated using dynamic electric voltage recovery device (DVR)
Operation characteristic of the asynchronous wind power plant under unbalanced source voltage can be improved in method, however due to the capacitance of DVR direct-current chain capacitances
It is limited, cause its control time limited, when exceeding its control time, asynchronous wind power plant will face unbalanced electric grid voltage institute band
The threat come.
Document (3) in the mixing wind power plant containing asynchronous Wind turbines and double-fed fan motor unit, control double-fed fan motor field to
Power grid injects negative-sequence current to inhibit the voltage unbalance factor of mixing wind power plant grid entry point, to improve mixing wind electric field surface to not
The adaptability of network voltage is balanced, however when network voltage occurs uneven, the equivalent negative phase-sequence power supply of system is difficult to determine, and
Double-fed fan motor unit uses Partial Power converter, and output capability for negative sequence current is extremely limited, in unbalanced source voltage degree
Control effect is difficult to realize when larger.
As the mainstream model in wind-power market, what permanent magnet direct-drive wind turbine group was composed with conventional asynchronous Wind turbines
Mixing wind farm group has become the inevitable choice of current old wind power plant dilatation, therefore, flexible using permanent magnet direct-drive wind turbine group
Control of the mixing wind farm group of control ability, research wind power plant containing permanent magnet direct-drive and asynchronous wind power plant under unbalanced source voltage
Method processed, to significantly reduce the voltage unbalance factor of wind farm grid-connected point, the grid connection security for being beneficial to wind generator system is steady
Determine runnability.
Invention content
For deficiencies of the prior art, it is an object of the invention to propose to contain under a kind of unbalanced electric grid voltage
The control method of the mixing wind farm group of permanent magnet direct-drive wind power plant and asynchronous wind power plant, this method is not before adding hardware device
It puts, control permanent magnet direct-drive wind power system output meets the negative-sequence current of amplitude and phase angle requirement, can farthest reduce wind
The voltage unbalance factor of electric field grid entry point, to improve the system operation of the mixing wind power plant under unbalanced source voltage
Energy.
The technical proposal of the invention is realized in this way：
The control method of the mixing wind farm group of wind power plant containing permanent magnet direct-drive and asynchronous wind power plant under unbalanced source voltage,
It is characterized in that：This method is related to the control to permanent magnet direct-drive wind power system grid side converter and machine-side converter；
(A) rate-determining steps of permanent magnet direct-drive wind power system grid side converter are：
A1 wind farm grid-connected three-phase voltage signal U) is acquiredgabcAnd DC bus-bar voltage signal Vdc, storage power grid electricity
Press the wind farm grid-connected three-phase voltage signal U of off-center operation operating mode start timegabc0；
A2) by collected wind farm grid-connected three-phase voltage signal UgabcWind-powered electricity generation is obtained after digital phase-locked loop PLL
The electrical angle θ of field grid entry point positive sequence voltage vectorgWith synchronous angular rate ω1；
A3) by the wind farm grid-connected three-phase voltage signal U of unbalanced source voltage operating condition start timegabc0, wind
Electric field grid entry point three-phase voltage signal UgabcRespectively by the perseverance of the static three-phase abc systems of axis to the static two-phase α β systems of axis
Power coordinate transform, the voltage signal under the convert to static two-phase α β systems of axis, i.e. Ugα0、Ugβ0、Ugα、Ugβ；
A4 wind farm grid-connected positive sequence voltage d axis oriented approach) is used, by step A3) the static two-phase α β reference axis of gained
Voltage signal U under systemgα0、Ugβ0、Ugα、UgβIt is sat to positive, reverse sync angular speed rotation by the static two-phase α β systems of axis
The invariable power of parameter system converts, using 2 ω1Trapper filters, and obtains wind farm grid-connected three-phase voltage in imbalance fault
Start time and system run under the conditions of unbalanced electric grid voltage during forward direction, reverse sync angular speed rotatable coordinate axis
Dq axis components under system, i.e.,：
A5) the three-phase current signal i of acquisition permanent magnet direct-drive wind power system grid side converter outputgabc；
A6) by collected grid side converter three-phase current signal igabcThrough the static three-phase abc systems of axis to static two
The invariable power coordinate transform of the phase α β systems of axis obtains the electric current i under the static two-phase α β systems of axisgα、igβ；
A7) by A6) grid side converter output current i under the static two-phase α β systems of axis of gainedgα、igβThrough static two-phase α β
The system of axis is to positive, reverse sync angular speed rotational coordinates shafting invariable power transformation, using 2 ω1Trapper filters
To grid side converter electric current in dq axis components positive, under reverse sync angular speed rotational coordinates shafting
A8) by step A4) wind farm grid-connected voltage of gained is under positive, reverse sync angular speed rotational coordinates shafting
Dq axis componentsWith step A7) gained grid side converter output current is in positive, reverse sync angle speed
Spend the dq axis components under rotational coordinates shaftingIt is sent into mean power and calculates module, according to following formula, calculate
Obtain the grid-connected average active power P of permanent magnet direct-drive wind power systemg_avAnd grid-connected reactive power Qg_av；
A9) by collected DC bus-bar voltage signal Vdc, step A4) wind farm grid-connected voltage of gained is positive, anti-
Dq axis components under synchronous angular velocity rotational coordinates shaftingStep A7) gained grid side converter
Dq axis component of the output current under positive synchronous angular velocity rotational coordinates shaftingWith step A8) gained permanent magnet direct-drive
The grid-connected average active power P of wind power systemg_avIt send to negative-sequence current amplitude maximum computing module, according to following formula, it may be determined that just
Sequence current limit and the lower permanent magnet direct-drive wind power plant of DC bus-bar voltage limitation can be output the amplitude of negative-sequence current, remove both formulas
The smaller maximum negative-sequence current amplitude of a conduct of middle calculated value；
In formula, IgmFor the maximum current amplitude that grid side converter allows to flow through, The amplitude of the respectively wind farm grid-connected positive and negative sequence voltage component of point, kmFor the index of modulation, work as use
When space vector pulse width modulation,ω1LgFor the impedance value of reactor；
A10) according to the grid-connected active power given value of permanent magnet direct-drive wind power systemAnd step A8) gained permanent magnet direct-drive
The grid-connected average active power P of wind power systemg_avWith grid-connected reactive power Qg_av, according to following formula, obtain grid side converter forward-order current
Reference instruction
In formula,For the grid-connected reactive power reference qref of grid side converter, when system operation is in unity power factorKp1And τi1The proportionality coefficient and integral of power outer shroud PI controllers respectively in grid side converter positive sequence control system
Time constant；
A11) by step A4) gained wind farm grid-connected voltage imbalance fault start time negative sequence componentWithThe wind farm grid-connected voltage negative sequence component detected in real time when system operationWithAnd step A9) gained net side
The exportable maximum negative-sequence current amplitude of converterIt send to grid side converter negative phase-sequence reference current instruction calculation module, obtains
Grid side converter negative phase-sequence reference current instructs
A12 following formula governing equation) is utilized, obtains grid side converter under forward and reverse synchronous angular velocity rotational coordinates shafting
Positive and negative sequence control voltage dq axis componentsWith
In formula, Kp3And τi3The proportionality coefficient of current inner loop PI controllers respectively in grid side converter positive sequence control system
And integration time constant, Kp4And τi4The proportionality coefficient of electric current loop PI controllers respectively in grid side converter negative phase-sequence control system
And integration time constant；
A13) by step A12) the positive and negative sequence control voltage dq axis components of gained grid side converterWith
It is converted respectively through positive, reverse sync angular speed rotational coordinates shafting to the static two-phase α β systems of axis invariable power
Obtain positive and negative sequence control voltage under the static two-phase α β systems of axisWith
A14) by step A13) the positive and negative sequence of grid side converter controls voltage under the static two-phase α β systems of axis of gained WithWith collected DC bus-bar voltage signal VdcNet side is generated by space vector pulse width modulation to become
Parallel operation PWM drive signal；
(B) rate-determining steps of machine-side converter are in permanent magnet direct-drive wind power system：
B1) machine-side converter uses vector control strategy, controls voltage and DC voltage VdcPass through space vector arteries and veins
Width modulation generates machine-side converter PWM drive signal, to maintain DC bus-bar voltage constant.
The step A11) include the following steps：
A11.1) during unbalanced source voltage operation, the instruction of grid side converter negative phase-sequence reference current is obtained through pattern 1 first
, that is, utilize step A4) wind farm grid-connected negative sequence voltage dq axis component of gainedWithWith step A9) gained net side change
The exportable maximum negative-sequence current amplitude of parallel operationIt is adjusted by negative sequence voltage PI and vector amplitude limit link obtains net side
Converter negative phase-sequence reference current instructsWithWherein negative sequence voltage adjusting equation is：
In formula,WithFor the negative-sequence current without amplitude limit point of grid side converter negative sequence voltage ring PI controllers output
Amount, Kp2And τi2It is the proportionality coefficient and integration time constant of grid side converter negative sequence voltage PI controllers；
A11.2 step A4) is utilized) wind farm grid-connected negative sequence voltage dp axis component of gainedWithSentence below carrying out
It is disconnected：
And
A11.3) if meeting step A11.2) decision condition, grid side converter negative phase-sequence reference current instruction still through step
Rapid A11.1) described in pattern 1 obtained；
A11.4) if being unsatisfactory for step A11.2) decision condition, grid side converter negative phase-sequence reference current instruction use mould
Formula 2 is obtained, i.e., by step A4) gained wind farm grid-connected negative sequence voltage dq axis component of imbalance fault start time It send to optimum phase angle computing module and negative-sequence current reference value computing module, according to following formula, calculates grid side converter
The optimum phase angle θ of negative-sequence current vectoropt, and then the instruction of grid side converter negative phase-sequence reference current is calculated
Compared with prior art, the present invention has the advantages that：
The present invention is directed to the mixing wind farm group of wind power plant containing permanent magnet direct-drive and asynchronous wind power plant, by permanent magnetism direct drive wind
The control of electric system calculates permanent magnet direct-drive wind power system using the negative-sequence current allowance and its phase angle characteristics of its grid side converter
The optimum phase angle of exportable maximum negative-sequence current amplitude and its negative-sequence current vector, to obtain permanent magnet direct-drive wind power system net
The negative phase-sequence reference current of side converter instructs, and then exports the control voltage met the requirements so that wind farm grid-connected voltage is not
The degree of balance is farthest reduced, to realize the effective suppression pulsed to electromagnetic torque in asynchronous wind power plant and output power
System enhances adaptability of the entire mixing wind farm group to unbalanced electric grid voltage.
Description of the drawings
Fig. 1 is the structural representation of the mixing wind farm group access electric system of wind power plant containing permanent magnet direct-drive and asynchronous wind power plant
Figure.
Fig. 2 is the control principle block diagram of permanent magnet direct-drive wind power system of the present invention.
When Fig. 3 is PCC point initial voltages degree of unbalancedness 8%, permanent magnet direct-drive wind power plant output average active power 0.5pu,
Change system emulation waveform when grid side converter negative-sequence current phase angle.
When Fig. 4 is PCC point initial voltages degree of unbalancedness 8%, permanent magnet direct-drive wind power plant output average active power 0.5pu,
Using the system emulation waveform under control method of the present invention.
When Fig. 5 is PCC point initial voltages degree of unbalancedness 5%, permanent magnet direct-drive wind power plant output average active power 0.5pu,
Using the system emulation waveform under control method of the present invention.
Specific implementation mode
Specific embodiments of the present invention are described in detail below in conjunction with attached drawing.
Fig. 1 is the mixing wind farm group access electric system of the wind power plant of permanent magnet direct-drive containing 30MW and the asynchronous wind power plants of 20MW
Structural schematic diagram, two class wind power plants access bulk power grid after coupling by common point (PCC points).Under unbalanced electric grid voltage, permanent magnetism
Directly driven wind-powered field makes full use of the negative-sequence current allowance and its phase angle characteristics of its grid side converter, to power grid output meet amplitude and
The negative-sequence current that phase angle requires, to reduce the voltage unbalance factor of common point and each wind farm grid-connected point, to improve entire wind
The runnability of electric field.
As shown in Fig. 2, the present invention is wind power plant containing permanent magnet direct-drive and asynchronous wind power plant under a kind of unbalanced electric grid voltage
Wind power plant group control method is mixed, the control object that it includes has：Direct-current chain capacitance 1, machine-side converter 2, grid side converter 3,
Space vector pulse width modulation module 4, permanent magnet direct-driving aerogenerator 5, current sensor 6, voltage sensor 7, average power meter
Calculate module 8, negative-sequence current maximum amplitude computing module 9, optimum phase angle computing module 10, negative-sequence current reference value computing module
11, trapper 12, the invariable power conversion module 13 of positive synchronous angular velocity rotational coordinates shafting to the static two-phase α β systems of axis,
Reverse sync angular speed rotational coordinates shafting is to the invariable power conversion module 14 of the static two-phase α β systems of axis, static abc three-phases
The system of axis is to the invariable power conversion module 15 of the static two-phase α β systems of axis, the static two-phase α β systems of axis to positive synchro angle
The invariable power conversion module 16 of speed rotational coordinates shafting, the static two-phase α β systems of axis to reverse sync angular speed rotational coordinates
The invariable power conversion module 17 of shafting, phaselocked loop (PLL) 18, grid side converter negative phase-sequence reference current instruction calculation module 19, arrow
Measure clipping module 20.
Specific implementation step of the present invention is as follows：
(A) rate-determining steps of permanent magnet direct-drive wind power system grid side converter are：
A1) wind farm grid-connected three-phase voltage U is acquired using voltage sensor 7gabcSignal and DC bus-bar voltage
VdcSignal, store unbalanced source voltage operating condition start time wind farm grid-connected three-phase voltage signal Ugabc0；
A2) by collected wind farm grid-connected three-phase voltage signal UgabcIt is obtained after digital phase-locked loop (PLL) 18
The electrical angle θ of wind farm grid-connected positive sequence voltage vectorgWith synchronous angular rate ω1；
A3) by collected wind farm grid-connected three-phase voltage initial signal Ugabc0, wind farm grid-connected three-phase voltage letter
Number UgabcRespectively by the static three-phase abc systems of axis to the static two-phase α β systems of axis invariable power coordinate transformation module 15,
Voltage signal under the convert to static two-phase α β systems of axis, i.e. Ugα0、Ugβ0、Ugα、Ugβ；
A4 wind farm grid-connected positive sequence voltage d axis oriented approach) is used, by step A3) gained Ugα0、Ugβ0、Ugα、UgβThrough
The static two-phase α β systems of axis are crossed to positive, reverse sync angular speed rotational coordinates shafting invariable power conversion module 16,17, then
By 2 ω1Trapper 12 filters, and obtains wind farm grid-connected three-phase voltage in imbalance fault start time and system not
Forward direction during being run under the conditions of balance network voltage, the dq axis components under reverse sync rotating coordinate system, i.e.,：
A5 current sensor 6) is utilized to acquire the three-phase current signal i of grid side converter outputgabc；
A6) by collected grid side converter three-phase current signal igabcThrough static three-phase abc coordinate systems to static two-phase α
The invariable power conversion module 15 of the β systems of axis obtains the electric current i under static two-phase α β shaftingsgα、igβ；
A7) by step A6) gained igα、igβIt is sat to positive, reverse sync angular speed rotation through the static two-phase α β systems of axis
The invariable power conversion module 16,17 of parameter system, using 2 ω1The filtering of trapper 12 obtains grid side converter electric current positive, anti-
Dq axis components under to synchronous rotating frame
A8) by step A4) dq axis component of the wind farm grid-connected voltage of gained under forward direction, reverse sync rotating coordinate system With step A7) gained grid side converter output current is under positive, reverse sync rotating coordinate system
Dq axis componentsIt is sent into mean power calculating module 8 and permanent magnetism direct drive wind is calculated according to following formula
The grid-connected average active power P of electric systemg_avAnd grid-connected reactive power Qg_av；
A9) according to step A1) gained DC bus-bar voltage Vdc, step A4) wind farm grid-connected voltage of gained is positive, anti-
Dq axis components under to synchronous rotating frameStep A7) gained grid side converter output current
Dq axis components under positive synchronous rotating frameWith step A8) gained permanent magnet direct-drive wind power system it is grid-connected average
Active-power Pg_avIt send to negative-sequence current amplitude maximum computing module 9, according to following formula, it may be determined that forward-order current limits and direct current
The lower permanent magnet direct-drive wind power plant of busbar voltage limitation can be output the amplitude of negative-sequence current, remove calculated value is smaller in formula the two one
It is a to be used as maximum negative-sequence current amplitude；
In formula, IgmFor the maximum current amplitude that grid side converter allows to flow through, The respectively amplitude of the positive and negative sequence voltage component of grid entry point, kmFor the index of modulation, sweared when using space
When measuring pulsewidth modulation,ω1LgFor the impedance value of reactor.
A10) according to the grid-connected active given value of permanent magnet direct-drive wind power systemAnd step A8) gained permanent magnet direct-drive wind-powered electricity generation
System grid connection average active power Pg_avWith grid-connected reactive power Qg_av, according to following formula, obtain the reference of grid side converter forward-order current
Instruction
In formula,For the grid-connected reactive power reference qref of grid side converter, when system operation is in unity power factorKp1And τi1The proportionality coefficient and integral of power outer shroud PI controllers respectively in grid side converter positive sequence control system
Time constant.
A11) by step A4) gained wind farm grid-connected voltage imbalance fault start time negative sequence componentWithThe wind farm grid-connected voltage negative sequence component detected in real time when system operationWithAnd step A9) gained net side
The maximum negative-sequence current amplitude of converter outputIt send to grid side converter negative phase-sequence reference current instruction calculation module 19, obtains net
Side converter negative phase-sequence reference current instruction
A12 following formula governing equation) is utilized, it is positive and negative in forward and reverse synchronization rotational coordinate ax system to obtain grid side converter
Sequence controls voltage dq axis components
In formula, Kp3And τi3The proportionality coefficient of current inner loop PI controllers respectively in grid side converter positive sequence control system
And integration time constant, Kp4And τi4The proportionality coefficient of electric current loop PI controllers respectively in grid side converter negative phase-sequence control system
And integration time constant.
A13) by step A12) the positive and negative sequence control voltage dq axis components of gained grid side converterWith
Respectively through positive, reverse sync angular speed rotating coordinate system to the static two-phase α β systems of axis invariable power conversion module 13,14
It obtains positive-negative sequence under the static two-phase α β systems of axis and controls voltageWith
A14) by step A13) the positive and negative sequence control voltage of gained grid side converterWithWith acquisition
DC bus-bar voltage VdcGrid side converter PWM drive signal is generated by space vector pulse width modulation module 4.
(B) rate-determining steps of machine-side converter are in permanent magnet direct-drive wind power system：
B1) machine-side converter uses vector control strategy, controls voltage and DC voltage VdcPass through space vector tune
System generates motor side converter pwm signal, to maintain 1 voltage constant of direct-current chain capacitance.
Grid side converter negative phase-sequence reference current instruction calculation module 19 of the present invention, specific implementation step is as follows：
A11.1) during unbalanced source voltage operation, grid side converter negative current instructions are obtained through pattern 1 first, i.e.,
Utilize step A4) wind farm grid-connected negative sequence voltage dq axis component of gainedWithWith step A9) gained grid side converter can
The negative-sequence current maximum amplitude of outputIt is adjusted by negative sequence voltage PI and vector clipping module 20 obtains net side transformation
Device negative phase-sequence reference current instructs.Wherein negative sequence voltage adjusting equation is：
In formula,WithFor the negative-sequence current without amplitude limit point of grid side converter negative sequence voltage ring PI controllers output
Amount, Kp2And τi2It is the proportionality coefficient and integration time constant of grid side converter negative sequence voltage PI controllers.
A11.2 step A4) is utilized) wind farm grid-connected negative sequence voltage dq axis component of gainedWithSentence below carrying out
It is disconnected：
And
A11.3) if meeting step A11.2) decision condition, grid side converter negative phase-sequence reference current instruction still through step
Rapid A11.1) described in pattern 1 obtained；
A11.4) if being unsatisfactory for step A11.2) decision condition, grid side converter negative phase-sequence reference current instruction use mould
Formula 2 is obtained, i.e., by step A4) gained wind farm grid-connected negative sequence voltage dq axis component of imbalance fault start time It is sent respectively to optimum phase angle computing module 10 and negative-sequence current reference value computing module 11, according to following formula, calculates net
The optimum phase angle θ of side converter negative-sequence current vectoropt, and then the instruction of grid side converter negative phase-sequence reference current is calculated
When Fig. 3 is PCC point initial voltages degree of unbalancedness 8%, permanent magnet direct-drive wind power plant output average active power 0.5pu,
Change system emulation waveform when grid side converter negative-sequence current phase angle.It can be seen that working as permanent magnet direct-drive wind power system net side
Converter negative-sequence current (igabc-) phase angle when 0~2 π changes, asynchronous wind power plant electromagnetic torque (TFSIG) two double-frequency fluctuations point
The amplitude of amount, PCC point voltage unbalance factors (δPCC) and permanent magnet direct-drive wind power plant grid entry point voltage unbalance factor (δPMSG) press
Cosine rule changes, wherein there are a certain phase angles of the negative-sequence current so that and the value of above three physical quantity reaches minimum,
As shown in Fig. 3 (c), (d), (g), (h), which is the optimum phase angle of negative-sequence current.
When Fig. 4 is PCC point initial voltages degree of unbalancedness 8%, permanent magnet direct-drive wind power plant output average active power 0.5pu,
Using the system emulation waveform under control method of the present invention.The figure and Fig. 3 are compared it is found that using control method of the present invention,
Under unbalanced source voltage, asynchronous wind power plant electromagnetic torque (TFSIG) amplitudes of two double-frequency fluctuation components, PCC point Voltage unbalances
Spend (δPCC) and permanent magnet direct-drive wind power plant grid entry point voltage unbalance factor (δPMSG) it is controlled to its corresponding minimum value.
When Fig. 5 is PCC point initial voltages degree of unbalancedness 5%, permanent magnet direct-drive wind power plant output average active power 0.5pu,
Using the system emulation waveform under control method of the present invention.Since PCC points initial voltage degree of unbalancedness is smaller at this time, using this hair
The bright control method, can be by permanent magnet direct-drive wind power plant grid entry point voltage unbalance factor (δPMSG) control to the minimum close to 0
Value, while asynchronous wind power plant electromagnetic torque (TFSIG) amplitudes of two double-frequency fluctuation components, PCC point voltage unbalance factors (δPCC)
It is controlled to its corresponding minimum value, and the minimum value is small compared with the value under operating mode corresponding to Fig. 4.
Finally, it should be noted that examples detailed above of the invention is only example to illustrate the invention, and it is not
It is the restriction to embodiments of the present invention.It is right although applicant describes the invention in detail with reference to preferred embodiment
For those of ordinary skill in the art, can also make on the basis of the above description other it is various forms of variation and
It changes.Here all embodiments can not be exhaustive.Every belong to that technical scheme of the present invention amplifies out aobvious and
Row of the variation or variation being clear to still in protection scope of the present invention.
Claims (2)
1. the control method of the mixing wind farm group of wind power plant containing permanent magnet direct-drive and asynchronous wind power plant under unbalanced source voltage,
It is characterized in that：This method is related to the control to permanent magnet direct-drive wind power system grid side converter and machine-side converter；
(A) rate-determining steps of permanent magnet direct-drive wind power system grid side converter are：
A1 wind farm grid-connected three-phase voltage signal U) is acquiredgabcAnd DC bus-bar voltage signal Vdc, storage network voltage is not
The wind farm grid-connected three-phase voltage signal U of balance movement operating mode start timegabc0；
A2) by collected wind farm grid-connected three-phase voltage signal UgabcIt is obtained after digital phase-locked loop PLL wind farm grid-connected
The electrical angle θ of point positive sequence voltage vectorgWith synchronous angular rate ω1；
A3) by the wind farm grid-connected three-phase voltage signal U of unbalanced source voltage operating condition start timegabc0, wind power plant
Grid entry point three-phase voltage signal UgabcRespectively by the invariable power of the static three-phase abc systems of axis to the static two-phase α β systems of axis
Coordinate transform, the voltage signal under the convert to static two-phase α β systems of axis, i.e. Ugα0、Ugβ0、Ugα、Ugβ；
A4 wind farm grid-connected positive sequence voltage d axis oriented approach) is used, by step A3) under the static two-phase α β systems of axis of gained
Voltage signal Ugα0、Ugβ0、Ugα、UgβBy the static two-phase α β systems of axis to positive, reverse sync angular speed rotatable coordinate axis
The invariable power of system converts, using 2 ω1Trapper filters, and obtains wind farm grid-connected three-phase voltage and starts in imbalance fault
Moment and system run under the conditions of unbalanced electric grid voltage during forward direction, under reverse sync angular speed rotational coordinates shafting
Dq axis components, i.e.,：
A5) the three-phase current signal i of acquisition permanent magnet direct-drive wind power system grid side converter outputgabc；
A6) by collected grid side converter three-phase current signal igabcIt is sat to static two-phase α β through the static three-phase abc systems of axis
The invariable power coordinate transform of parameter system obtains the electric current i under the static two-phase α β systems of axisgα、igβ；
A7) by step A6) grid side converter output current i under the static two-phase α β systems of axis of gainedgα、igβIt is sat through static two-phase α β
Parameter system is to positive, reverse sync angular speed rotational coordinates shafting invariable power transformation, using 2 ω1Trapper filters to obtain
Grid side converter electric current is in dq axis components positive, under reverse sync angular speed rotational coordinates shafting
A8) by step A4) dq axis of the wind farm grid-connected voltage of gained under forward direction, reverse sync angular speed rotational coordinates shafting
ComponentWith step A7) gained grid side converter output current is in positive, reverse sync angular speed rotation
Turn the dq axis components under the system of axisMean power calculating module is sent into be calculated according to following formula
The grid-connected average active power P of permanent magnet direct-drive wind power systemg_avAnd grid-connected reactive power Qg_av；
A9) by collected DC bus-bar voltage signal Vdc, step A4) wind farm grid-connected voltage of gained is positive, reversed same
Walk the dq axis components under angular speed rotational coordinates shaftingStep A7) gained grid side converter output
Dq axis component of the electric current under positive synchronous angular velocity rotational coordinates shaftingWith step A8) gained permanent magnet direct-drive wind-powered electricity generation
System grid connection average active power Pg_avIt send to negative-sequence current amplitude maximum computing module, according to following formula, it may be determined that positive sequence electricity
Ductility limit system and the lower permanent magnet direct-drive wind power plant of DC bus-bar voltage limitation can be output the amplitude of negative-sequence current, remove both formulas and fall into a trap
The smaller maximum negative-sequence current amplitude of a conduct of calculation value；
In formula, IgmFor the maximum current amplitude that grid side converter allows to flow through, The amplitude of the respectively wind farm grid-connected positive and negative sequence voltage component of point, kmFor the index of modulation, work as use
When space vector pulse width modulation,ω1LgFor the impedance value of reactor；
A10) according to the grid-connected active power given value of permanent magnet direct-drive wind power systemAnd step A8) gained permanent magnet direct-drive wind-powered electricity generation
System grid connection average active power Pg_avWith grid-connected reactive power Qg_av, according to following formula, obtain the reference of grid side converter forward-order current
Instruction
In formula,For the grid-connected reactive power reference qref of grid side converter, when system operation is in unity power factor
Kp1And τi1The proportionality coefficient of power outer shroud PI controllers and the time of integration are normal respectively in grid side converter positive sequence control system
Number；
A11) by step A4) gained wind farm grid-connected voltage imbalance fault start time negative sequence componentWith
The wind farm grid-connected voltage negative sequence component detected in real time when system operationAnd step A9) gained net side transformation
The exportable maximum negative-sequence current amplitude of deviceIt send to grid side converter negative phase-sequence reference current instruction calculation module, obtains net side
Converter negative phase-sequence reference current instructs
A12) utilize following formula governing equation, obtain grid side converter under forward and reverse synchronous angular velocity rotational coordinates shafting just,
Negative phase-sequence controls voltage dq axis componentsWith
In formula, Kp3And τi3The proportionality coefficient and integral of current inner loop PI controllers respectively in grid side converter positive sequence control system
Time constant, Kp4And τi4The proportionality coefficient and integral of electric current loop PI controllers respectively in grid side converter negative phase-sequence control system
Time constant；
A13) by step A12) the positive and negative sequence control voltage dq axis components of gained grid side converterIt passes through respectively
Positive, reverse sync angular speed rotational coordinates shafting to the static two-phase α β systems of axis the invariable power converts to obtain static two-phase α β
Positive and negative sequence controls voltage under the system of axisWith
A14) by step A13) the positive and negative sequence of grid side converter controls voltage under the static two-phase α β systems of axis of gainedWithWith collected DC bus-bar voltage signal VdcNet side transformation is generated by space vector pulse width modulation
Device PWM drive signal；
(B) rate-determining steps of machine-side converter are in permanent magnet direct-drive wind power system：
B1) machine-side converter uses vector control strategy, controls voltage and DC voltage VdcPass through space vector pulse width tune
System generates machine-side converter PWM drive signal, to maintain DC bus-bar voltage constant.
2. the mixing wind of wind power plant containing permanent magnet direct-drive and asynchronous wind power plant under unbalanced source voltage according to claim 1
The control method of electric field group, which is characterized in that the step A11) include the following steps：
A11.1) during unbalanced source voltage operation, the instruction of grid side converter negative phase-sequence reference current is obtained through pattern 1 first, i.e.,
Utilize step A4) wind farm grid-connected negative sequence voltage dq axis component of gainedWithWith step A9) gained grid side converter can
The maximum negative-sequence current amplitude of outputIt is adjusted by negative sequence voltage PI and vector amplitude limit link obtains grid side converter
Negative phase-sequence reference current instructsWithWherein negative sequence voltage adjusting equation is：
In formula,WithFor the negative-sequence current component without amplitude limit of grid side converter negative sequence voltage ring PI controllers output, Kp2
And τi2It is the proportionality coefficient and integration time constant of grid side converter negative sequence voltage PI controllers；
A11.2 step A4) is utilized) wind farm grid-connected negative sequence voltage dp axis component of gainedWithCarry out following judgement：
And
A11.3) if meeting step A11.2) decision condition, grid side converter negative phase-sequence reference current instruction still through step
A11.1 the pattern 1 described in) is obtained；
A11.4) if being unsatisfactory for step A11.2) decision condition, grid side converter negative phase-sequence reference current instruction use pattern 2
Obtained, i.e., by step A4) gained wind farm grid-connected negative sequence voltage dq axis component of imbalance fault start time It send to optimum phase angle computing module and negative-sequence current reference value computing module, according to following formula, calculates grid side converter negative phase-sequence
The optimum phase angle θ of current phasoropt, and then the instruction of grid side converter negative phase-sequence reference current is calculated
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| CN110198034B (en) * | 2018-02-27 | 2020-10-23 | 北京金风科创风电设备有限公司 | Converter reactive power control method and device and wind generating set |
| CN109378836A (en) * | 2018-11-21 | 2019-02-22 | 中国石油大学(华东) | A kind of control method for coordinating of direct drive permanent magnetic synchronous generator under uneven and harmonic |
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