CN107294137A - Dual feedback wind power generation system pusher side current transformer is counter to push away variable structure control system and method - Google Patents
Dual feedback wind power generation system pusher side current transformer is counter to push away variable structure control system and method 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
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive 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
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
-
- 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
- H02P21/141—Flux estimation
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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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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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
- H02P2101/00—Special adaptation of control arrangements for generators
- H02P2101/15—Special adaptation of control arrangements for generators for wind-driven turbines
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- 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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- 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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
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Abstract
The invention belongs to wind-driven generator control technology field, it is related to dual feedback wind power generation system pusher side converter control system.Variable structure control system, method, and the dual feedback wind power generation system based on the system are pushed away the invention discloses dual feedback wind power generation system pusher side current transformer is counter, the system includes：Mathematical Models unit (11), current instruction value computing unit (12), counter push away variable-structure control unit (13), space vector pulse width modulation unit (14)；This method is based on Lyapunov stability theory, under two-phase synchronous rotating frame double-fed wind power generator mathematical modeling, carries out the anti-variable structure control algorithm that pushes away and designs, realizes the uneoupled control of system active reactive power；To eliminate the disturbing influence in running, a variable-structure control link containing uncertainty PI prediction schemes is added, remains to meet Liapunov Asymptotic Stability condition when making each subsystem be disturbed.The dynamic property of dual feedback wind power generation system is further improved, the parameter robustness of system is enhanced.
Description
Technical field
The invention belongs to wind-driven generator control technology field, it is related to dual feedback wind power generation system pusher side current transformer control system
System, and in particular to dual feedback wind power generation system pusher side current transformer is counter to push away variable structure control system and control method.
Background technology
In recent years, wind-power electricity generation receives very big concern as a kind of green novel energy source generation mode.Direct-drive permanent-magnet synchronous
Wind power generating set and dual-feed asynchronous wind power generator group are most development potentiality and market prospects in current wind electricity generation system
Two class units, for improve generating efficiency, both of which use the variable speed constant frequency generator method of operation.Wherein, double-fed wind power generator
（DFIG）Using most, technology is the most ripe, is current mainstream model.DFIG system architectures are as shown in Figure 1.DFIG stators around
Group access common frequency power network, rotor windings then by frequency converter provide frequency, amplitude, phase variable power supply, realize the friendship of generator
Excitation is flowed, now electricity generation system can adjust the frequency of exciting current according to the rotation speed change of wind energy conversion system, realize that constant frequency is exported.Due to
This variable speed constant frequency scheme realizes that the power for flowing through rotor circuit is the rotating speed fortune by double-fed generator in rotor circuit
The slip power that line range is determined, therefore, can reduce the capacity of converter.In addition, DFIG scheme feasible systems are active, nothing
The uneoupled control of work(, can export corresponding perception or capacitive reactive power, the flexibility pair of this idle control according to the requirement of power network
Power network is highly beneficial.
The control method of current most widely used doubly fed induction generator is the vector control method based on PI controllers.From
The angle of control theory is set out, the decoupling control method based on vector oriented, essentially by state transformation by inactive state
The exchange status amount of mechanical periodicity is mapped as the quantity of state of direct current in rotation status space in space, and passes through feedforward compensation mode
Nonlinear and crossing coupling is eliminated, so that the linear model of double-fed generator is obtained, to be set using the method for linear control theory
Count PI controllers.AC excitation double-feedback generator essence is a multivariable, non-linear, close coupling complication system, and its is linear
Model is by nonlinear wind generator system model linearization at a certain operating point, because wind generator system has seriously
Non-linear and coupling, and there are many uncertain parameters and very strong interference signal, traditional control method is merely able to
Ensure the control effect near operating point, it is impossible to meet the control requirement of actual wind power system.Additionally, due in feedforward compensation
Comprising the parameter of electric machine, the effect of uneoupled control can be influenceed when parameter is inaccurate.In addition, being rung to obtain desired closed-loop dynamic
Should, the parameters of PI controllers also must according to the parameter designing of motor, therefore vector controlled effect dependent on the parameter of electric machine
Accuracy, and motor is in actual motion, its some parameter can be changed, and such as rotor resistance is raised with motor operation temperature
And change.Due to the uncertainty of wind generator system, the mathematical modeling for accurately obtaining it is highly difficult, and this gives mathematics
Control method based on model brings very big inconvenience, in view of double-fed generator multivariable, close coupling, nonlinear spy
Point, seeks new advanced control method to improve system performance, improve generating matter using modern control theory for system
Amount, is just received significant attention.
A kind of dual feedback wind power generation system integral sliding mode control based on ESO of CN201510375423.6 disclosure of the invention
The control method of device, implements according to following steps：Row write the mathematical modeling of dual feedback wind power generation system first；Obtain mathematical modeling
Afterwards, go out the expansion state based on dual feedback wind power generation system according to the principle design of expanded condition observer on this basis to observe
Device；Then, it is determined that the switching function of Sliding Mode Controller；Finally, reach and protect in finite time according to systematic error
This control targe on sliding-mode surface is held, sliding formwork control ratio is asked for.The invention is realized to be run to dual feedback wind power generation system
Uneoupled control in journey, improves the corresponding speed of system, the parameter robustness of system is enhanced to a certain extent.But, it is
Operation state performance of uniting and parametric stability are still undesirable.
The content of the invention
The purpose of the present invention is to overcome the deficiencies in the prior art, for the above-mentioned technical problem present in prior art, is changed
Enter structure design and push away variable structure control system and method there is provided a kind of dual feedback wind power generation system pusher side current transformer is counter, this is
System is based on Lyapunov stability theory, under two-phase synchronous rotating frame double-fed wind power generator mathematical modeling,
Carry out the anti-variable structure control algorithm that pushes away to design, realize the uneoupled control of system active reactive power；To eliminate the actual fortune of system
Disturbing influence in row, add a variable-structure control link containing uncertainty PI prediction schemes, make each subsystem by
Remain to meet Liapunov Asymptotic Stability condition during disturbance.The control program is implemented according to following steps：Row write double-fed first
The mathematical modeling of wind generator system；Choose suitable liapunov function establishment the counter of system and push away decoupling control policy, with
Conventional vector control mode is compared, can simplify control device design process, using variable structure control method eliminate system it is uncertain because
The influence of element.The present invention is studied the anti-variable-structure control strategy that pushes away of dual feedback wind power generation system, controls double-fed wind-force
Electricity generation system pusher side current transformer, without increasing additional hardware, realizes the power solution in dual feedback wind power generation system running
Coupling is controlled, and is further improved the dynamic property of dual feedback wind power generation system, is enhanced the parameter robustness of system.
To achieve the above object, the technical solution adopted by the present invention is：Dual feedback wind power generation system pusher side current transformer is counter to be pushed away
Variable structure control system, including：
Mathematical Models unit：With reference to stator-flux-oriented vector control, double-fed wind power generator is set up under dq coordinate systems
Mathematical modeling；
Current instruction value computing unit：By active reactive power command value, pass through the decoupling relation between power and stator current
Formula, obtains the command value of stator current；
It is counter to push away variable-structure control unit：Based on Lyapunov stability theory, progress is counter to push away control algorithm design, obtains
The controlled quentity controlled variable of system, to eliminate the disturbing influence in running, adds one containing uncertain in system control amount
The variable-structure control link of PI prediction schemes is spent, remains to meet Liapunov Asymptotic Stability bar when making each subsystem be disturbed
Part；
Space vector pulse width modulation (space vector pulse width modulation, SVPWM) unit：Will be above-mentioned anti-
The controlled quentity controlled variable of structure changes unit output is pushed away through Park inverse transformations and space vector pulse width modulation, dual feedback wind power generation system machine is obtained
The driving control signal of side converter.
On this basis, further technical scheme is：Based on the anti-double-fed for pushing away variable structure control system of pusher side current transformer
Wind generator system, including：Wind energy conversion system, gear-box, double-fed wind power generator, pusher side current transformer, DC bus capacitor, net side unsteady flow
Device, transformer, pusher side converter control system, and net side current transformer control system, wherein wind energy conversion system are connected by gear-box
To double-fed wind power generator, double-fed aerogenerator stator connection power network, rotor connection pusher side current transformer, the connection of pusher side current transformer
To net side current transformer, DC bus capacitor is arranged between pusher side current transformer and net side current transformer, and net side current transformer passes through transformer
It is connected to power network；Pusher side converter control system control machine side converter, net side current transformer control system connection control net side becomes
Flow device；It is characterized in that：Pusher side converter control system pushes away variable structure control method control machine side converter using counter.
Further, the anti-variable structure control system that pushes away of the pusher side current transformer includes：
Mathematical Models unit：With reference to stator-flux-oriented vector control, double-fed wind power generator is set up under dq coordinate systems
Mathematical modeling；
Current instruction value computing unit：By active reactive power command value, pass through the decoupling relation between power and stator current
Formula, obtains the command value of stator current；
It is counter to push away variable-structure control unit：Based on Lyapunov stability theory, progress is counter to push away control algorithm design, obtains
The controlled quentity controlled variable of system, to eliminate the disturbing influence in running, adds one containing uncertain in system control amount
The variable-structure control link of PI prediction schemes is spent, remains to meet Liapunov Asymptotic Stability bar when making each subsystem be disturbed
Part；
Space vector pulse width modulation (SVPWM) unit：By the above-mentioned anti-controlled quentity controlled variable for pushing away the output of structure changes unit through Park inverse transformations
And space vector pulse width modulation, obtain the driving control signal of dual feedback wind power generation system pusher side current transformer.
On this basis, further technical scheme is：Dual feedback wind power generation system pusher side current transformer is counter to push away structure changes control
Method processed, it is characterised in that comprise the following steps：
S1. Mathematical Models：With reference to stator-flux-oriented vector control, double-fed wind power generator is set up under dq coordinate systems
Mathematical modeling；
S2. current instruction value is calculated：By active reactive power command value, pass through the decoupling relation between power and stator current
Formula, obtains the command value of stator current；
S3. it is counter to push away variable-structure controller design：Based on Lyapunov stability theory, carry out the anti-control algolithm that pushes away and set
Meter, obtains the controlled quentity controlled variable of system, to eliminate the disturbing influence in running, and adding one in system control amount contains
The variable-structure control link of uncertainty PI prediction schemes, remains to meet Liapunov asymptotic when each subsystem is disturbed
Stable condition；
S4. space vector pulse width modulation：The above-mentioned anti-controlled quentity controlled variable for pushing away the output of structure changes unit is sweared through Park inverse transformations and space
Pulsewidth modulation is measured, the driving control signal of dual feedback wind power generation system pusher side current transformer is obtained.
Further：The dual feedback wind power generation system pusher side current transformer of the present invention is counter to push away variable structure control method, and its feature exists
In specifically implementing according to following steps：
S1. Mathematical Models：
Row write out mathematical modeling of the double feedback electric engine under two-phase synchronous rotary dq coordinate systems
Stator and rotor voltage equation：
Wherein,、、、Respectively double feedback electric engine stator and rotor voltage axis component；、、、Respectively
Double feedback electric engine stator and rotor current axis component；,,,Respectively double feedback electric engine stator and rotor windings magnetic linkage axle
Component；、Respectively stator and rotor resistance；It is differential operator；For synchronous angular velocity；=-For slippage angular frequency
Rate.
Flux linkage equations：
Wherein,For the self-induction of two-phase stator winding under two-phase synchronous rotary dq coordinate systems；For two-phase synchronous rotary dq coordinates
The self-induction of the lower two-phase rotor windings of system；For the equivalent electric between coaxial stator and rotor winding under two-phase synchronous rotary dq coordinate systems
Sense.
Formula (2) is substituted into formula (1) to obtain：
Torque equation：
Wherein,For electromagnetic torque；For the number of pole-pairs of motor.
S2. current instruction value is calculated：
By active reactive power command value, by the decoupling relational expression between power and stator current, the finger of stator current is obtained
Make value；
The d axles of synchronous rotating frame are oriented on stator magnetic linkage, that is, take stator magnetic linkage direction and synchronous coordinate system d axle weights
Close, the magnetic linkage component on d, q axle is respectively：
Wherein,For stator magnetic linkage vector magnitude.Because double-fed generator stator side frequency is power frequency, stator winding resistance is far small
In stator winding reactance, it can ignore.By formula (1), formula (5) and ignore stator resistance and can obtain
In formula,For stator voltage vector amplitude, when stator terminal is incorporated to preferable power networkEqual to line voltage vector magnitude,
For constant.
According to instantaneous power theory, stator side instantaneous active of the double-fed generator under two-phase synchronous rotary dq coordinate systems,
Reactive power is：
Formula (6) substitution above formula can be obtained：
From above formula, under Stator flux oriented control doubly-fed generation machine stator output active and reactive power respectively with stator
Electric current q, d axis component is directly proportional, and passes through regulationWithIt is respectively regulated independently stator side active and reactive power.
Formula (8) deformation can obtain into stator current command value is
Wherein,WithThe stator current d axis components and q axis component reference values respectively given,WithRespectively given
Active power reference value and reactive power reference qref.
S3. it is counter to push away variable-structure controller design：
The counter of dual feedback wind power generation system pushes away variable-structure controller design：
Formula (5) is substituted into formula (2) the dq axis components of rotor current can be obtained and be：
Formula (10) is substituted into formula (2) to obtain
In formula,.Formula (11) substitution formula (1) is obtained into rotor voltage expression formula is：
It can be obtained by formula (10)
Formula (12) is obtained、Afterwards, formula (13) is substituted into obtain
Alternating current circuit impedance variations can cause the uncertainty of dual feedback wind power generation system parameter.The system in controller design
Uncertain factor is represented by F1 and F2.It is control targe that dual feedback wind power generation system, which chooses active and reactive power, chooses state
Variable isWith, control input isWith, the mathematical modeling under synchronous rotating frame is
Wherein, the uncertain part that F1 and F2 is produced for system due to impedance parameter variation.Define tracking error=-,=-。
Constructing Lyapunov functions is：
Carrying out derivation to it is：
Add variable-structure control and eliminate influence of the uncertain factor to system, design controller input is：
Wherein,﹥ 0,﹥ 0, sgn are sign function.
Cause dual feedback wind power generation system Parameters variation unknowable because system is disturbed, it is impossible to it is determined that uncertain part F1,
F2 concrete numerical value, F1, F2 are predicted using a PI link
Controller input type (18) is substituted into selected Lyapunov functional expressions (17) has
From above formula, can guarantee that above formula is negative, subsystem Asymptotic Stability.
S4. space vector pulse width modulation：
According to described system control amount、Pass through Park inverse transformations and space vector pulse width modulation (SVPWM) technology structure
Make and obtain one group of pwm signal and be controlled with the pusher side current transformer to DFIG.
Further, in step sl, mathematical modeling of the double feedback electric engine under two-phase synchronous rotary dq coordinate systems is write out in row
Before, proceed as follows：
Double feedback electric engine three-phase stator and rotor winding is transformed into two-phase synchronous rotary dq coordinate systems by three phase static abc coordinate systems, adopted
Represented with following transformation matrix
Wherein：For d axles in dq coordinate systems and two-phase stator stationaryAngle in coordinate system；For d axles in dq coordinate systems
Rotated with two-phase rotor speedIn coordinate systemAngle.
Further, it is in step S3 specific implementation method：
S3a. DFIG threephase stator voltage is gatheredWith threephase stator electric current, three-phase rotor current, using locking phase
Ring detects threephase stator voltageAngular frequency, while calculating the rotating speed for obtaining DFIG by detecting；
S3b. the space vector in three phase static abc coordinate systems is decomposed into rotate with synchronous rotational speed two by conversion to be synchronised
Rotate in dq coordinate systems；Respectively by threephase stator voltage, threephase stator electric current, three-phase rotor currentBecome
Change, obtain the stator voltage d axis components under two-phase synchronous rotary dq coordinate systems, q axis components, stator current d axis components
, q axis components, rotor current d axis components, q axis components；
Line translation is entered to threephase stator voltage according to following formula：
Wherein：、、Phase voltage respectively on threephase stator voltage A, B, C three-phases,、Correspond to two identical
The d axis components and q axis components of stator voltage vector under rotating coordinate system are walked, as shown in figure 5,For d axles withFolder between axle
Angle.
Line translation is entered to threephase stator electric current according to following formula：
Wherein：、、Phase current respectively on threephase stator electric current A, B, C three-phases,、Two are corresponded to be synchronised rotation
Turn the d axis components and q axis components of stator current vector under coordinate system, as shown in figure 5,For d axles withAngle between axle.
Line translation is entered to three-phase rotor current according to following formula：
Wherein：、、Phase current respectively on three-phase rotor current A, B, C three-phases,、Two are corresponded to be synchronised rotation
Turn the d axis components and q axis components of coordinate system lower rotor part current phasor, as shown in figure 5,For d axles withAngle between axle.
S3c. basis is converted to、Stator voltage vector amplitude is obtained by polar coordinate transform；By formulaCalculating is obtained。
S3d. according to given active power reference valueAnd reactive power reference qref, calculate DFIG stator currents d
Axis component reference value, q axis component reference values。
S3e. stator current d axis component reference values are passed through, q axis component reference values, stator current d axis components, q axles
Component, calculate,；F1, F2 are predicted by PI links.
S3f. will be according to step S3b, step S3c, step 3d, the stator current d axis components that step S3e is obtained, q axles point
Amount, rotor current d axis components, q axis components, stator current d axis component reference values, q axis component reference values；No
The factor upper bound F1, F2 are determined,AndBe input to it is counter push away variable-structure control module, obtain system control amount、；And then root
According to described system control amount、One is obtained by Park inverse transformations and space vector pulse width modulation (SVPWM) technical construction
Group pwm signal is controlled with the pusher side current transformer to DFIG.
Stator current d axis components and q axis components are carried out according to following formula counter to push away variable-structure control：
Wherein：WithThe d axis components and q axis components of corresponding modulating voltage vector,WithThe d of respective rotor current phasor
Axis component and q axis components,,For stator magnetic linkage d axis components,Slippage angular frequency for DFIG and=-,For DFIG rotor mutual inductance,WithRespectively DFIG stator inductance and inductor rotor,For turning for DFIG
Sub- resistance,F 1WithF 2For system because impedance parameter changes the uncertain part produced, sgn is sign function, tracking error
=-,=-, coefficient﹥ 0,﹥ 0.
Beneficial effects of the present invention.
Control method of the present invention is that on the basis of DFIG mathematical modelings, tradition is instead of using the anti-variable-structure controller that pushes away
PI controllers, the stability of a system ensure that based on Lyapunov functions, the uneoupled control of system active reactive power is realized；
To eliminate the disturbing influence in running, a variable-structure control ring containing uncertainty PI prediction schemes is added
Section, remains to meet Lyapunov Asymptotic Stability conditions when each subsystem is disturbed.Present invention control can realize double-fed wind
The independent effectively control of force generating system active and reactive power, can reach preferable dynamic property, enhance the parameter of system
Robustness.
Brief description of the drawings
Fig. 1 is the structural representation of dual feedback wind power generation system.
Fig. 2 is the present invention based on the anti-dual feedback wind power generation system structural representation for pushing away variable structure control system of pusher side current transformer
Figure.
Fig. 3 is the anti-schematic diagram for pushing away variable structure control system of dual feedback wind power generation system pusher side current transformer of the invention.
Fig. 4 is the anti-flow chart for pushing away variable structure control method of dual feedback wind power generation system pusher side current transformer of the invention.
Fig. 5 is the stator magnetic linkage oriented schematic diagram of dual feedback wind power generation system of the invention.
Parts, position and numbering in figure：1- pusher side current transformers are counter to push away variable structure control system, 11- Mathematical Models
Unit, 12- current instruction values computing unit, 13- are counter to push away variable-structure control unit, 14- space vector pulse width modulations unit, 2- nets
Side converter.
Embodiment
Technical scheme is described in detail below in conjunction with the accompanying drawings, but present disclosure is not limited to
This.
Identical with Fig. 1 prior art, the dual feedback wind power generation system based on the present invention includes：Wind energy conversion system, gear-box is double
Feedback wind-driven generator, pusher side current transformer, DC bus capacitor, net side current transformer 2, transformer, pusher side converter control system, and
The control system of net side current transformer 2, wherein wind energy conversion system are connected to double-fed wind power generator by gear-box, and double-fed wind power generator is fixed
Son connection power network, rotor connection pusher side current transformer, pusher side current transformer is connected to net side current transformer 2, and DC bus capacitor is arranged on machine
Between side converter and net side current transformer 2, net side current transformer 2 is connected to power network by transformer；Pusher side converter control system
Control machine side converter, the control system of net side current transformer 2 connection control net side current transformer 2.Due to using the control of pusher side current transformer
Double-fed wind power generator, and the mathematical modeling of double-fed wind power generator is System with Nonlinear Coupling so that design pusher side unsteady flow
Device becomes complex.
As shown in Fig. 2 the dual feedback wind power generation system of the present invention, it is characterised in that pusher side converter control system is used
It is counter to push away variable structure control method control machine side converter.
The present invention using vector controlled, it is counter push away control, the control strategy that variable-structure control is combined designs its control system.
First, based on Lyapunov stability theory, the anti-controlled quentity controlled variable for pushing away control algorithm design, obtaining system is carried out, then,
To eliminate the disturbing influence in running, addition one contains uncertainty PI prediction schemes in system control amount
Variable-structure control link, makes each subsystem remain to meet Liapunov Asymptotic Stability condition when being disturbed.
Below, binding isotherm is derived and schematic diagram explains that dual feedback wind power generation system of the present invention is counter and pushes away structure changes
Control method.
As shown in Fig. 2 the dual feedback wind power generation system pusher side current transformer of the present invention is counter to push away variable structure control system 1, including：
Mathematical Models unit 11, current instruction value computing unit 12 is counter to push away variable-structure control unit 13, and space vector pulse width
Modulating unit 14.
Each unit major function is as follows：
Mathematical Models unit 11：With reference to stator-flux-oriented vector control, double-fed wind power generator is set up in dq coordinate systems
Under mathematical modeling；
Current instruction value computing unit 12：By active reactive power command value, closed by the decoupling between power and stator current
It is formula, obtains the command value of stator current；
It is counter to push away variable-structure control unit 13：Based on Lyapunov stability theory, progress is counter to push away control algorithm design, obtains
To the controlled quentity controlled variable of system, to eliminate the disturbing influence in running, one is added in system control amount containing not true
Surely the variable-structure control link of PI prediction schemes is spent, remains to meet Liapunov Asymptotic Stability when making each subsystem be disturbed
Condition；
Space vector pulse width modulation (SVPWM) unit 14)：By the above-mentioned anti-controlled quentity controlled variable for pushing away the output of structure changes unit through Park inversions
Change and space vector pulse width modulation, obtain the driving control signal of dual feedback wind power generation system pusher side current transformer.
Below, with reference to Fig. 3-5, the operation principle of each part for pushing away variable structure control system 1 counter to pusher side current transformer
And its control method is described in detail.
The dual feedback wind power generation system pusher side current transformer of the present invention is counter to push away variable structure control method, including following step in detail
Suddenly：
S1. Mathematical Models：
As shown in step 101 in Fig. 4, in Mathematical Models unit 11, with reference to stator-flux-oriented vector control, double-fed is set up
Mathematical modeling of the wind-driven generator under dq coordinate systems；
Double feedback electric engine three-phase stator and rotor winding is transformed into two-phase synchronous rotary dq coordinate systems by three phase static abc coordinate systems, adopted
Represented with following transformation matrix
Wherein：For d axles in dq coordinate systems and two-phase stator stationaryAngle in coordinate system；For d axles in dq coordinate systems
Rotated with two-phase rotor speedIn coordinate systemAngle.
Row write out mathematical modeling of the double feedback electric engine under two-phase synchronous rotary dq coordinate systems：
Double-fed wind power generator uses stator-flux-oriented vector control, as shown in figure 5, under dq coordinate systems, by stator magnetic linkage
Direction is oriented to d axles, and stator voltage, electric current positive direction follow Motor convention, then can draw its under dq coordinate systems it is fixed,
Rotor voltage, magnetic linkage, electromagnetic torque equation are as follows：
Stator and rotor voltage equation is：
Wherein,、、、Respectively double feedback electric engine stator and rotor voltage axis component；、、、Respectively
Double feedback electric engine stator and rotor current axis component；,,,Respectively double feedback electric engine stator and rotor windings magnetic linkage axle
Component；、Respectively stator and rotor resistance；It is differential operator；For synchronous angular velocity；=-For slippage angular frequency
Rate.
Flux linkage equations are：
Wherein,For the self-induction of two-phase stator winding under two-phase synchronous rotary dq coordinate systems；For two-phase synchronous rotary dq coordinates
The self-induction of the lower two-phase rotor windings of system；For the equivalent electric between coaxial stator and rotor winding under two-phase synchronous rotary dq coordinate systems
Sense.
Flux linkage equations in formula (2) are substituted into stator and rotor voltage equation (1), can obtain simplified voltage equation is
Torque equation is
Wherein,For electromagnetic torque；For the number of pole-pairs of motor.
S2. current instruction value is calculated：
As shown in step 102 in Fig. 4, in current instruction value computing unit 12, by active reactive power command value, by power with
Decoupling relational expression between stator current, obtains the command value of stator current.
The d axles of synchronous rotating frame are oriented on stator magnetic linkage, that is, take stator magnetic linkage direction and synchronous coordinate system d axles
Overlap, the magnetic linkage component on d, q axle is respectively：
Wherein,For stator magnetic linkage vector magnitude.Because double-fed generator stator side frequency is power frequency, stator winding resistance is far small
In stator winding reactance, it can ignore.By formula (1), formula (5) and ignore stator resistance and can obtain
In formula,For stator voltage vector amplitude, when stator terminal is incorporated to preferable power networkEqual to line voltage vector magnitude, it is
Constant.
According to instantaneous power theory, stator side instantaneous active of the double-fed generator under two-phase synchronous rotary dq coordinate systems,
Reactive power is：
Formula (6) is substituted into formula (7) to obtain
From above formula, under Stator flux oriented control doubly-fed generation machine stator output active and reactive power respectively with stator
Electric current q, d axis component is directly proportional, and passes through regulationWithIt is respectively regulated independently stator side active and reactive power.
Formula (8) deformation can obtain into stator current command value is
Wherein,WithThe stator current d axis components and q axis component reference values respectively given,WithRespectively give
Active power reference value and reactive power reference qref.
S3. it is counter to push away variable-structure controller design：
As shown in step 103 in Fig. 4, variable-structure control unit 13 is pushed away counter, based on Lyapunov stability theory, is entered
The anti-controlled quentity controlled variable for pushing away control algorithm design, obtaining system of row, to eliminate the disturbing influence in running, in system control
A variable-structure control link containing uncertainty PI prediction schemes is added in amount, is remained to when each subsystem is disturbed full
Sufficient Liapunov Asymptotic Stability condition.
Pass through stator current d axis components reference value, q axis component reference values、, stator current d axis components, q axles point
Amount, calculate,；F1, F2 are predicted by PI links.
Formula (5) is substituted into formula (2) the dq axis components of rotor current can be obtained and be：
Formula (10) is substituted into formula (2) to obtain
In formula,.Formula (11) substitution formula (1) is obtained into rotor voltage expression formula is：
It can be obtained by formula (10)
Formula (12) is obtained、Afterwards, formula (13) is substituted into obtain
Alternating current circuit impedance variations can cause the uncertainty of dual feedback wind power generation system parameter.The system in controller design
Uncertain factor is represented by F1 and F2.It is control targe that dual feedback wind power generation system, which chooses active and reactive power, chooses state
Variable isWith, control input isWith, the mathematical modeling under synchronous rotating frame is
Wherein, the uncertain part that F1 and F2 is produced for system due to impedance parameter variation.Define tracking error=-,=-。
Constructing Lyapunov functions is：
Carrying out derivation to it is：
Add variable-structure control and eliminate influence of the uncertain factor to system, design controller input is：
Wherein,﹥ 0,﹥ 0, sgn are sign function.
Cause dual feedback wind power generation system Parameters variation unknowable because system is disturbed, it is impossible to it is determined that uncertain part F1,
F2 concrete numerical value, F1, F2 are predicted using a PI link；
Controller input type (18) is substituted into selected Lyapunov functional expressions (17) has
From above formula, can guarantee that above formula is negative, subsystem Asymptotic Stability.
Specific implementation method is：
S3a. DFIG threephase stator voltage is gatheredWith threephase stator electric current, three-phase rotor current, using locking phase
Ring detects threephase stator voltageAngular frequency, while calculating the rotating speed for obtaining DFIG by detecting。
S3b. the space vector in three phase static abc coordinate systems is decomposed into the two-phase rotated with synchronous rotational speed by conversion
In synchronous rotary dq coordinate systems；Respectively by threephase stator voltage, threephase stator electric current, three-phase rotor currentCarry out
Conversion, obtains the stator voltage d axis components under two-phase synchronous rotary dq coordinate systems, q axis components, stator current d axis components, q axis components, rotor current d axis components, q axis components。
Line translation is entered to threephase stator voltage according to following formula：
Wherein：、、Phase voltage respectively on threephase stator voltage A, B, C three-phases,、Correspond to two identical
The d axis components and q axis components of stator voltage vector under rotating coordinate system are walked, as shown in figure 5,For d axles withFolder between axle
Angle.
Line translation is entered to threephase stator electric current according to following formula：
Wherein：、、Phase current respectively on threephase stator electric current A, B, C three-phases,、Two are corresponded to be synchronised rotation
Turn the d axis components and q axis components of stator current vector under coordinate system, as shown in figure 5,For d axles withAngle between axle.
Line translation is entered to three-phase rotor current according to following formula：
Wherein：、、Phase current respectively on three-phase rotor current A, B, C three-phases,、Two are corresponded to be synchronised rotation
Turn the d axis components and q axis components of coordinate system lower rotor part current phasor, as shown in figure 5,For d axles withAngle between axle.
S3c. basis is converted to、Stator voltage vector amplitude is obtained by polar coordinate transform；By formulaCalculating is obtained。
S3d. according to given active power reference valueAnd reactive power reference qref, calculate DFIG stator currents d
Axis component reference value, q axis component reference values。
S3e. stator current d axis component reference values are passed through, q axis component reference values, stator current d axis components, q axles
Component, calculate,；F1, F2 are predicted by PI links.
S3f. as shown in figure 3, will be according to step S3b, step S3c, step 3d, the stator current d axles point that step S3e is obtained
Amount, q axis components, rotor current d axis components, q axis components, stator current d axis component reference values, q axis components ginseng
Examine value；The uncertain factor upper bound F1, F2,AndBe input to it is counter push away variable-structure control module, obtain system control amount、；And then according to described system control amount、Pass through Park inverse transformations and space vector pulse width modulation (SVPWM) technology
Construction is obtained one group of pwm signal and is controlled with the pusher side current transformer to DFIG.
Stator current d axis components and q axis components are carried out according to following formula counter to push away variable-structure control：
Wherein：WithThe d axis components and q axis components of corresponding modulating voltage vector,WithThe d of respective rotor current phasor
Axis component and q axis components,,For stator magnetic linkage d axis components,Slippage angular frequency for DFIG and=-,For DFIG rotor mutual inductance,WithRespectively DFIG stator inductance and inductor rotor,For turning for DFIG
Sub- resistance,F 1WithF 2For system because impedance parameter changes the uncertain part produced, sgn is sign function, tracking error
=-,=-, coefficient﹥ 0,﹥ 0.
S4. space vector pulse width modulation：
As shown in step 104 in Fig. 4, in space vector pulse width modulation unit 14, according to described system control amount、It is logical
Cross Park inverse transformations and space vector pulse width modulation (SVPWM) technical construction obtains one group of pwm signal to become DFIG pusher side
Stream device is controlled.
In summary, dual feedback wind power generation system disclosed by the invention is counter pushes away variable structure control method, it is possible to achieve double-fed
Independent, effective control of wind powered generator system active and reactive power, compared with conventional vector control mode, simplifies control
Device design process, the influence of system uncertain factor is eliminated using variable structure control method, double-fed wind generating is further improved
The dynamic property of system, enhances the parameter robustness of system.
It is described above, only it is presently preferred embodiments of the present invention, and be not used to the interest field of the limitation present invention.It is any with this
The technical scheme that the interest field that claim is covered is implemented, or any those skilled in the art, are utilized
The method content of the disclosure above makes the scheme of many possible variations and modification, belongs to protection scope of the present invention.
Claims (7)
- Variable structure control system is pushed away 1. dual feedback wind power generation system pusher side current transformer is counter, including：Mathematical Models unit (11)：With reference to stator-flux-oriented vector control, double-fed wind power generator is set up in dq coordinates Mathematical modeling under system；Current instruction value computing unit (12)：By active reactive power command value, pass through the decoupling between power and stator current Relational expression, obtains the command value of stator current；It is counter to push away variable-structure control unit (13)：Based on Lyapunov stability theory, progress is counter to push away control algorithm design, The controlled quentity controlled variable of system is obtained, to eliminate the disturbing influence in running, one is added in system control amount containing not The variable-structure control link of degree of certainty PI prediction schemes, remains to meet Liapunov asymptotic steady when each subsystem is disturbed Fixed condition；Space vector pulse width modulation unit (14)：By the above-mentioned anti-controlled quentity controlled variable for pushing away the output of structure changes unit through Park inverse transformations and sky Between Vector Pulse Width Modulation, obtain the driving control signal of dual feedback wind power generation system pusher side current transformer.
- 2. based on the anti-dual feedback wind power generation system for pushing away variable structure control system of pusher side current transformer, including：Wind energy conversion system, gear-box, Double-fed wind power generator, pusher side current transformer, DC bus capacitor, net side current transformer (2), transformer, pusher side converter control system, And net side current transformer (2) control system, wherein wind energy conversion system is connected to double-fed wind power generator by gear-box, double-fed wind-force hair Motor stator connects power network, and rotor connection pusher side current transformer, pusher side current transformer is connected to net side current transformer (2), DC bus capacitor Between pusher side current transformer and net side current transformer (2), net side current transformer (2) is connected to power network by transformer；Pusher side becomes Flow device control system control machine side converter, net side current transformer (2) control system connection control net side current transformer (2)；Its feature It is：Pusher side converter control system pushes away variable structure control method control machine side converter using counter.
- 3. as claimed in claim 2 based on the anti-dual feedback wind power generation system for pushing away variable structure control system of pusher side current transformer, its It is characterised by：The anti-variable structure control system (1) that pushes away of the pusher side current transformer includes：Mathematical Models unit (11)：With reference to stator-flux-oriented vector control, double-fed wind power generator is set up in dq coordinates Mathematical modeling under system；Current instruction value computing unit (12)：By active reactive power command value, pass through the decoupling between power and stator current Relational expression, obtains the command value of stator current；It is counter to push away variable-structure control unit (13)：Based on Lyapunov stability theory, progress is counter to push away control algorithm design, The controlled quentity controlled variable of system is obtained, to eliminate the disturbing influence in running, one is added in system control amount containing not The variable-structure control link of degree of certainty PI prediction schemes, remains to meet Liapunov asymptotic steady when each subsystem is disturbed Fixed condition；Space vector pulse width modulation unit (14)：By the above-mentioned anti-controlled quentity controlled variable for pushing away the output of structure changes unit through Park inverse transformations and sky Between Vector Pulse Width Modulation, obtain the driving control signal of dual feedback wind power generation system pusher side current transformer.
- 4. dual feedback wind power generation system pusher side current transformer is counter to push away variable structure control method, it is characterised in that comprise the following steps：S1. Mathematical Models：With reference to stator-flux-oriented vector control, double-fed wind power generator is set up under dq coordinate systems Mathematical modeling；S2. current instruction value is calculated：By active reactive power command value, pass through the decoupling relation between power and stator current Formula, obtains the command value of stator current；S3. it is counter to push away variable-structure controller design：Based on Lyapunov stability theory, carry out the anti-control algolithm that pushes away and set Meter, obtains the controlled quentity controlled variable of system, to eliminate the disturbing influence in running, and adding one in system control amount contains The variable-structure control link of uncertainty PI prediction schemes, remains to meet Liapunov asymptotic when each subsystem is disturbed Stable condition；S4. space vector pulse width modulation：The above-mentioned anti-controlled quentity controlled variable for pushing away the output of structure changes unit is sweared through Park inverse transformations and space Pulsewidth modulation is measured, the driving control signal of dual feedback wind power generation system pusher side current transformer is obtained.
- 5. dual feedback wind power generation system pusher side current transformer as claimed in claim 4 is counter to push away variable structure control method, specifically according to Following steps are implemented：S1. Mathematical Models：Row write out mathematical modeling of the double feedback electric engine under two-phase synchronous rotary dq coordinate systems；Stator and rotor voltage equation：Formula 01.jpgWherein,usd.jpg、usq.jpg、urd.jpg、urq.jpgRespectively double feedback electric engine stator and rotor voltage axis component；isd.jpg、isq.jpg、irq.jpg、irq.jpgIt is respectively double Feed machine stator and rotor current axis component；Ysd.jpg,Ysq.jpg,Yrd.jpg,Yrq.jpgRespectively double feedback electric engine stator and rotor windings magnetic linkage axle divides Amount；Rs.jpg、Rr.jpgRespectively stator and rotor resistance；P.jpgIt is differential operator；W1.jpgFor synchronous angular velocity；Ws.jpg=W1.jpg-Wr.jpgFor slippage angular frequency；Flux linkage equations：Formula 02.jpgWherein,Ls.jpgFor the self-induction of two-phase stator winding under two-phase synchronous rotary dq coordinate systems；Lr.jpgFor two-phase synchronous rotary dq coordinates The self-induction of the lower two-phase rotor windings of system；Lm.jpgFor the equivalent inductance between coaxial stator and rotor winding under two-phase synchronous rotary dq coordinate systems；Formula (2) is substituted into formula (1) to obtain：Formula 03.jpgTorque equation：Formula 04.jpgWherein,Te.jpgFor electromagnetic torque；Np.jpgFor the number of pole-pairs of motor；S2. current instruction value is calculated：By active reactive power command value, by the decoupling relational expression between power and stator current, the finger of stator current is obtained Make value；The d axles of synchronous rotating frame are oriented on stator magnetic linkage, that is, take stator magnetic linkage direction and synchronous coordinate system d axle weights Close, the magnetic linkage component on d, q axle is respectively：Formula 05.jpgWherein,Ys.jpgFor stator magnetic linkage vector magnitude；Because double-fed generator stator side frequency is power frequency, stator winding resistance is far small In stator winding reactance, it can ignore；By formula (1), formula (5) and ignore stator resistance and can obtainFormula 06.jpgIn formula,Us.jpgFor stator voltage vector amplitude, when stator terminal is incorporated to preferable power networkUs.jpgEqual to line voltage vector magnitude, it is Constant；It is stator side instantaneous active of the double-fed generator under two-phase synchronous rotary dq coordinate systems, idle according to instantaneous power theory Power is：Formula 07.jpgFormula (6) substitution above formula can be obtained：Formula 08.jpgFrom above formula, under Stator flux oriented control doubly-fed generation machine stator output active and reactive power respectively with stator Electric current q, d axis component is directly proportional, and passes through regulationisq.jpgWithisd.jpgIt is respectively regulated independently stator side active and reactive power；Formula (8) deformation can obtain into stator current command value isFormula 09.jpgWherein,Isd stars .jpgWithIsq stars .jpgThe stator current d axis components and q axis component reference values respectively given,Ps stars .jpgWithQs stars .jpgRespectively given Active power reference value and reactive power reference qref；S3. it is counter to push away variable-structure controller design：Formula (5) is substituted into formula (2) the dq axis components of rotor current can be obtained and be：Formula 10.jpgFormula (10) is substituted into formula (2) to obtainFormula 11.jpg 3In formula,Formula 02.jpg, formula (11) substitution formula (1) is obtained into rotor voltage expression formula is：Formula 12.jpgIt can be obtained by formula (10)Formula 13.jpgFormula (12) is obtainedPird.jpg、Pirq.jpgAfterwards, formula (13) is substituted into obtainFormula 14.jpgAlternating current circuit impedance variations can cause the uncertainty of dual feedback wind power generation system parameter；The system in controller design Uncertain factor is represented by F1 and F2；It is control targe that dual feedback wind power generation system, which chooses active and reactive power, chooses state Variable isisd.jpgWithisq.jpg, control input isurd.jpgWithurq.jpg, the mathematical modeling under synchronous rotating frame isFormula 15.jpgWherein, F1 and F2 defines tracking error for system because impedance parameter changes the uncertain part producede1.jpg=Isd stars .jpg-isd.jpg,e2.jpg=Isq stars .jpg-isq.jpg；Constructing Lyapunov functions is：Formula 16.jpgCarrying out derivation to it is：Formula 17.jpgAdd variable-structure control and eliminate influence of the uncertain factor to system, design controller input is：Formula 18.jpgWherein,K1.jpg﹥ 0,K2.jpg﹥ 0, sgn are sign function；Cause dual feedback wind power generation system Parameters variation unknowable because system is disturbed, it is impossible to it is determined that uncertain part F1, F2's Concrete numerical value, F1, F2 are predicted using a PI linkFormula 19.jpgController input type (18) is substituted into selected Lyapunov functional expressions (17) hasFormula 20.jpgFrom above formula, can guarantee that above formula is negative, subsystem Asymptotic Stability；S4. space vector pulse width modulation：According to described system control amounturd.jpg、urq.jpgPass through Park inverse transformations and space vector pulse width modulation (SVPWM) technical construction One group of pwm signal is obtained to be controlled with the pusher side current transformer to DFIG.
- 6. dual feedback wind power generation system pusher side current transformer as claimed in claim 5 is counter to push away variable structure control method, its feature exists In：, in the step S1b, before row write out mathematical modeling of the double feedback electric engine under two-phase synchronous rotary dq coordinate systems, carry out Following operation：Double feedback electric engine three-phase stator and rotor winding is transformed into two-phase synchronous rotary dq coordinate systems by three phase static abc coordinate systems, adopted Represented with following transformation matrixFormula 21.jpgFormula 22.jpgWherein：Q.jpgFor d axles in dq coordinate systems and two-phase stator stationaryabs.jpgAngle in coordinate system；Q`.jpgFor d axles in dq coordinate systems with The speed rotation of two-phase rotorabr.jpgIn coordinate systemar.jpgAngle.
- 7. dual feedback wind power generation system pusher side current transformer as described in claim 4-6 is counter to push away variable structure control method, its feature It is：The specific implementation method of the step S3 is：S3a. DFIG threephase stator voltage is gatheredUsabc.jpgWith threephase stator electric currentisabc.jpg, three-phase rotor currentirabc.jpg, using locking phase 5 Ring detects threephase stator voltageUsabc.jpgAngular frequencyW1.jpg, while calculating the rotating speed for obtaining DFIG by detectingWr.jpg；S3b. the space vector in three phase static abc coordinate systems is decomposed into rotate with synchronous rotational speed two by conversion to be synchronised Rotate in dq coordinate systems；Respectively by threephase stator voltageUsabc.jpg, threephase stator electric currentisabc.jpg, three-phase rotor currentirabc.jpgBecome Change, obtain the stator voltage d axis components under two-phase synchronous rotary dq coordinate systemsUsd.jpg, q axis componentsUsq.jpg, stator current d axis componentsisd.jpg , q axis componentsisq.jpg, rotor current d axis componentsird.jpg, q axis componentsirq.jpg；Line translation is entered to threephase stator voltage according to following formula：Formula 23.jpgWherein：usa.jpg、usb.jpg、usc.jpgPhase voltage respectively on threephase stator voltage A, B, C three-phases,usd.jpg、usq.jpgCorrespond to two identical The d axis components and q axis components of stator voltage vector under rotating coordinate system are walked,q1.jpgFor d axles withas.jpgAngle between axle；Line translation is entered to threephase stator electric current according to following formula：Formula 24.jpgWherein：isa.jpg、isb.jpg、isc.jpgPhase current respectively on threephase stator electric current A, B, C three-phases,isd.jpg、isq.jpgTwo are corresponded to be synchronised rotation Turn the d axis components and q axis components of stator current vector under coordinate system,q1.jpgFor d axles withas.jpgAngle between axle；Line translation is entered to three-phase rotor current according to following formula：Formula 25.jpgWherein：ira.jpg、irb.jpg、irb.jpgPhase current respectively on three-phase rotor current A, B, C three-phases,ird.jpg、irq.jpgTwo are corresponded to be synchronised rotation Turn the d axis components and q axis components of coordinate system lower rotor part current phasor,qs.jpgFor d axles withar.jpgAngle between axle；S3c. basis is converted toUsd.jpg、Usq.jpgStator voltage vector amplitude is obtained by polar coordinate transformUs.jpg；By formulaFormula 01-2.jpgCalculating is obtainedYsd.jpg；S3d. according to given active power reference valuePs stars .jpgAnd reactive power reference qrefQs stars .jpg, calculate DFIG stator current d axles point Measure reference valueIsd stars .jpg, q axis component reference valuesIsq stars .jpg；S3e. stator current d axis component reference values are passed throughIsd stars .jpg, q axis component reference valuesIsq stars .jpg, stator current d axis componentsisd.jpg, q axis componentsisq.jpg, calculatee1.jpg,e2.jpg；F1, F2 are predicted by PI links；S3f. will be according to step S3b, step S3c, step 3d, the stator current d axis components that step S3e is obtainedisd.jpg, q axis componentsisq.jpg 6 , rotor current d axis componentsird.jpg, q axis componentsirq.jpg, stator current d axis component reference valuesIsd stars .jpg, q axis component reference valuesIsq stars .jpg；It is uncertain because The plain upper bound F1, F2,Ws.jpgAndYsd.jpgBe input to it is counter push away variable-structure control module, obtain system control amounturd.jpg、urq.jpg；And then according to described System control amounturd.jpg、urq.jpgOne group of PWM is obtained by Park inverse transformations and space vector pulse width modulation (SVPWM) technical construction Signal is controlled with the pusher side current transformer to DFIG；Stator current d axis components and q axis components are carried out according to following formula counter to push away variable-structure control：Formula 18.jpgWherein：urd.jpgWithurq.jpgThe d axis components and q axis components of corresponding modulating voltage vector,ird.jpgWithirq.jpgThe d of respective rotor current phasor Axis component and q axis components,Formula 02.jpg,Ysd.jpgFor stator magnetic linkage d axis components,Ws.jpgSlippage angular frequency for DFIG andWs.jpg=W1.jpg-Wr.jpg,Lm.jpgFor DFIG rotor mutual inductance,Ls.jpgWithLr.jpgRespectively DFIG stator inductance and inductor rotor,Rr.jpgFor turning for DFIG Sub- resistance, F1 and F2 are for system because impedance parameter changes the uncertain part produced, and sgn is sign function, tracking errore1.jpg =Isd stars .jpg-isd.jpg,e2.jpg=Isq stars .jpg-isq.jpg, coefficientK1.jpg﹥ 0,K2.jpg﹥ 0. 7
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| CN107769209A (en) * | 2017-11-24 | 2018-03-06 | 深圳市海思瑞科电气技术有限公司 | The control method and control circuit of Active Power Filter-APF when inductance value and uncertain resistance |
| CN107769209B (en) * | 2017-11-24 | 2023-11-24 | 深圳市海思瑞科电气技术有限公司 | Control method and control circuit of power filter when inductance value and resistance value are uncertain |
| CN109617473A (en) * | 2018-12-29 | 2019-04-12 | 山东大学 | A kind of double-fed blower direct Power Control method and system |
| CN109617473B (en) * | 2018-12-29 | 2020-10-02 | 山东大学 | Method and system for controlling direct power of doubly-fed wind turbine |
| CN110112743A (en) * | 2019-04-04 | 2019-08-09 | 上海电力学院 | A kind of isolated form variable-frequency transformer and its starting control and expansion method |
| CN110912186A (en) * | 2019-11-27 | 2020-03-24 | 国网冀北电力有限公司电力科学研究院 | Modeling method of double-fed wind power generation virtual synchronous generator |
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| CN110854912B (en) * | 2019-11-27 | 2023-05-26 | 中国石油大学(华东) | Current instruction control method for doubly-fed fan during fault ride-through in weak network environment |
| CN110854912A (en) * | 2019-11-27 | 2020-02-28 | 中国石油大学(华东) | Current instruction control method during fault ride-through period of doubly-fed wind turbine in weak grid environment |
| CN113224784A (en) * | 2020-12-31 | 2021-08-06 | 华北水利水电大学 | Rotor excitation self-adaptive control method for grid-connected processing of double-fed wind power plant |
| CN113224784B (en) * | 2020-12-31 | 2024-06-18 | 华北水利水电大学 | Rotor excitation self-adaptive control method for grid-connected processing of doubly-fed wind power plant |
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Application publication date: 20171024 |