CN110429836A - A kind of control method and device of Three-Phase PWM Rectifier - Google Patents
A kind of control method and device of Three-Phase PWM Rectifier Download PDFInfo
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- CN110429836A CN110429836A CN201910668417.8A CN201910668417A CN110429836A CN 110429836 A CN110429836 A CN 110429836A CN 201910668417 A CN201910668417 A CN 201910668417A CN 110429836 A CN110429836 A CN 110429836A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/02—Conversion of ac power input into dc power output without possibility of reversal
- H02M7/04—Conversion of ac power input into dc power output without possibility of reversal by static converters
- H02M7/12—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/21—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/217—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only
- H02M7/219—Conversion of ac power input into dc power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only in a bridge configuration
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
Abstract
This application provides a kind of control method and device of Three-Phase PWM Rectifier, are related to technical field of electric power.This method comprises: the output three-phase voltage of wind-driven generator to be transformed to the α shaft voltage component u under alpha-beta two-phase stationary coordinate system respectivelygαWith β shaft voltage component ugβAnd the α * shaft voltage component u under α *-β * two-phase stationary coordinate system* gαWith β * shaft voltage component u* gβ；Determine adjustment factor kcm；According to kcmAnd u* gα, determine first voltage component, and according to kcmAnd u* gβ, determine second voltage component；By ugαThe first control amount, u are used as with the sum of first voltage componentgβThe second control amount is used as with the sum of second voltage component；According to the first control amount and the second control amount, the pulse signal for controlling each phase bridge arm device for power switching on-off of Three-Phase PWM Rectifier is generated.Response speed when control Three-Phase PWM Rectifier can be improved using the application.
Description
Technical field
This application involves technical field of electric power, more particularly to a kind of control method and device of Three-Phase PWM Rectifier.
Background technique
Currently, three-phase PWM (Pulse width modulation, pulse width modulation) rectifier is because having exchange side electricity
Flow sineization and can unity power factor run the advantages that, be widely applied to field of wind power generation.
The control strategy of existing Three-Phase PWM Rectifier is usually the control strategy with phase-locked loop and no phase-locked loop section
Control strategy, and the control strategy with phase-locked loop is usually built upon on two-phase synchronous rotating frame, by phaselocked loop reality
It is now synchronous with exchange side voltage vector.The detection accuracy of phaselocked loop be the key that influence wind power generating set control performance because
Element, but when Three-Phase PWM Rectifier exchange side voltage is distorted or frequency mutates, phaselocked loop will be unable to quickly accurate
Ground detects voltage synchronous signal, reduces the runnability of wind power generating set.In addition, phaselocked loop also increases control system
Complexity, so that response speed is lower when controlling Three-Phase PWM Rectifier.In addition, in the control strategy with phase-locked loop, three-phase
Model of the PWM rectifier under two-phase rotating coordinate system contains cross-couplings item, needs feed forward decoupling control, further increases
The complexity of control algolithm structure, so that response speed is lower when controlling Three-Phase PWM Rectifier.
And the control strategy of no phase-locked loop section is usually built upon on the virtual dq coordinate system of fixed speed, that is, is carried out
After Park (Parker) transformation, the decoupling control of dq axis component is carried out in dq coordinate system, equally increases the complexity of control algolithm
Property, so that response speed is lower when controlling Three-Phase PWM Rectifier.
Summary of the invention
A kind of control method and device for being designed to provide Three-Phase PWM Rectifier of the embodiment of the present application, can be improved
Control response speed when Three-Phase PWM Rectifier.Specific technical solution is as follows:
In a first aspect, providing a kind of control method of Three-Phase PWM Rectifier, the method is applied to wind generator system
In control unit, the wind generator system further includes wind-driven generator, Three-Phase PWM Rectifier, dc-link capacitance, described
The exchange side of Three-Phase PWM Rectifier is connect with the wind-driven generator, the DC side of the Three-Phase PWM Rectifier and the direct current
Bus capacitor connection, which comprises
The output three-phase voltage of the wind-driven generator is transformed into the α shaft voltage component under alpha-beta two-phase stationary coordinate system
ugαWith β shaft voltage component ugβ；
The output three-phase voltage of the wind-driven generator is transformed into the α * shaft voltage under α *-β * two-phase stationary coordinate system point
Measure u* gαWith β * shaft voltage component u* gβ, the α *-β * two-phase stationary coordinate system is advanced 90 degree of the alpha-beta two-phase stationary coordinate system
Two-phase stationary coordinate system；
To the difference of the peak power output of the DC side output power and wind-driven generator of the Three-Phase PWM Rectifier
Value carries out PI operation, and operation result is carried out amplitude limiting processing, obtains adjustment factor kcm；
According to the adjustment factor kcmWith the α * shaft voltage component u* gα, determine first voltage component, and according to the tune
Save coefficient kcmWith the β * shaft voltage component u* gβ, determine second voltage component；
Calculate the α shaft voltage component ugαThe sum of with the first voltage component, as the first control amount, and described in calculating
β shaft voltage component ugβThe sum of with the second voltage component, as the second control amount；
Space vector pulse width modulation SVPWM is carried out according to first control amount and second control amount, generation is used for
Control the pulse signal of each phase bridge arm device for power switching on-off of the Three-Phase PWM Rectifier.
Optionally, described according to the adjustment factor kcmWith the α * shaft voltage component u* gα, determine first voltage component,
And according to the adjustment factor kcmWith the β * shaft voltage component u* gβ, determine second voltage component, comprising:
Calculate the adjustment factor and the α * shaft voltage component u* gαProduct, as first voltage component；
Calculate the adjustment factor and the β * shaft voltage component u* gβProduct, as second voltage component.
Optionally, described according to the adjustment factor kcmWith the α * shaft voltage component u* gα, determine first voltage component,
And according to the adjustment factor kcmWith the β * shaft voltage component u* gβ, determine second voltage component, comprising:
The α * shaft voltage component and the β * shaft voltage component are normalized according to the following formula:
(u* gα1)2+(u* gβ1)2=1
Wherein, u* gαFor the α * shaft voltage component, u* gβFor the β * shaft voltage component, u* gα1For the α * axis after normalization
Component of voltage, u* gβ1For the β * shaft voltage component after normalization；
α * shaft voltage component u after calculating the adjustment factor and normalization* gα1Product, as first voltage component；
β * shaft voltage component u after calculating the adjustment factor and normalization* gβ1Product, as second voltage component.
Optionally, the method also includes:
Calculate the product of the voltage of the dc-link capacitance and the electric current of the dc-link capacitance；
It is filtered using product of the low-pass filter LPF to calculating, the DC side for obtaining the Three-Phase PWM Rectifier is defeated
Power out.
Optionally, the method also includes:
Obtain the revolving speed of the wind-driven generator；
According to the corresponding relationship of preset peak power output and revolving speed, determine that the revolving speed of the wind-driven generator is corresponding
The peak power output of the wind-driven generator.
Second aspect, provides a kind of control device of Three-Phase PWM Rectifier, and described device is applied to wind generator system
In control unit, the wind generator system further includes wind-driven generator, Three-Phase PWM Rectifier, dc-link capacitance, described
The exchange side of Three-Phase PWM Rectifier is connect with the wind-driven generator, the DC side of the Three-Phase PWM Rectifier and the direct current
Bus capacitor connection, described device include:
First conversion module, for the output three-phase voltage of the wind-driven generator to be transformed to alpha-beta two-phase static coordinate
α shaft voltage component u under systemgαWith β shaft voltage component ugβ；
Second conversion module, for the output three-phase voltage of the wind-driven generator to be transformed to the static seat of α *-β * two-phase
α * shaft voltage component u under mark system* gαWith β * shaft voltage component u* gβ, the α *-β * two-phase stationary coordinate system is the advanced alpha-beta
The two-phase stationary coordinate system that 90 degree of two-phase stationary coordinate system；
Adjustment factor generation module, for the DC side output power and wind-force hair to the Three-Phase PWM Rectifier
The difference of the peak power output of motor carries out PI operation, and carries out amplitude limiting processing to operation result using limiter, is adjusted
Save coefficient kcm；
First determining module, for according to the adjustment factor kcmWith the α * shaft voltage component u* gα, determine first voltage
Component, and according to the adjustment factor and the β * shaft voltage component u* gβ, determine second voltage component；
Control amount generation module, for calculating the α shaft voltage component ugαThe sum of with the first voltage component, as
One control amount, and calculate the β shaft voltage component ugβThe sum of with the second voltage component, as the second control amount；
SVPWM module, for carrying out space vector pulse width modulation according to first control amount and second control amount
SVPWM generates the pulse signal for controlling each phase bridge arm device for power switching on-off of the Three-Phase PWM Rectifier.
Optionally, first determining module, comprising:
First computing unit, for calculating the adjustment factor and the α * shaft voltage component u* gαProduct, as first
Component of voltage；
Second computing unit, for calculating the adjustment factor and the β * shaft voltage component u* gβProduct, as second
Component of voltage.
Optionally, first determining module, comprising:
Normalization unit, for returning according to the following formula to the α * shaft voltage component and the β * shaft voltage component
One change processing:
(u* gα1)2+(u* gβ1)2=1
Wherein, u* gαFor the α * shaft voltage component, u* gβFor the β * shaft voltage component, u* gα1For the α * axis after normalization
Component of voltage, u* gβ1For the β * shaft voltage component after normalization；
Third computing unit, for the α * shaft voltage component u after calculating the adjustment factor and normalizing* gα1Product,
As first voltage component；
4th computing unit, for the β * shaft voltage component u after calculating the adjustment factor and normalizing* gβ1Product,
As second voltage component.
Optionally, described device further include:
Low-pass filter LPF, for the voltage and the electric current of the dc-link capacitance to the dc-link capacitance
Product is filtered, and obtains the DC side output power of the Three-Phase PWM Rectifier.
Optionally, described device further includes maximum power determining module；
The maximum power determining module, for obtaining the revolving speed of the wind-driven generator；According to preset maximum output
The corresponding relationship of power and revolving speed determines the maximum work output of the corresponding wind-driven generator of the revolving speed of the wind-driven generator
Rate.
The embodiment of the present application provides a kind of control method and device of Three-Phase PWM Rectifier, is applied to wind-power electricity generation system
Control unit in system, wind generator system further include wind-driven generator, Three-Phase PWM Rectifier, dc-link capacitance, three-phase
The exchange side of PWM rectifier is connect with wind-driven generator, and the DC side of Three-Phase PWM Rectifier is connect with dc-link capacitance, can
The output three-phase voltage of wind-driven generator to be transformed to the α shaft voltage component u under alpha-beta two-phase stationary coordinate systemgαWith β shaft voltage
Component ugβ；The output three-phase voltage of wind-driven generator is transformed to the α * shaft voltage component u under α *-β * two-phase stationary coordinate system* gα
With β * shaft voltage component u* gβ, α *-β * two-phase stationary coordinate system is the static seat of two-phase of 90 degree of advanced alpha-beta two-phase stationary coordinate system
Mark system；The difference of the peak power output of DC side output power and wind-driven generator to Three-Phase PWM Rectifier carries out PI fortune
It calculates, and operation result is subjected to amplitude limiting processing, obtain adjustment factor kcm；According to adjustment factor kcmWith α * shaft voltage component u* gα,
Determine first voltage component, and according to adjustment factor kcmWith β * shaft voltage component u* gβ, determine second voltage component；Calculate α axis electricity
Press component ugαThe sum of with first voltage component, as the first control amount, and β shaft voltage component u is calculatedgβWith second voltage component
The sum of, as the second control amount；SVPWM (Space Vector Pulse is carried out according to the first control amount and the second control amount
Width Modulation, space vector pulse width modulation), it generates for controlling each phase bridge arm power switch of Three-Phase PWM Rectifier
The pulse signal of device on-off.
The application foundation controls Three-Phase PWM Rectifier in two-phase stationary coordinate system, does not establish and revolves fixed
Turn on the virtual dq coordinate system of frequency, without Park coordinate transform is carried out, in addition the application simplifies control without phaselocked loop
The structure of algorithm processed improves response speed when control Three-Phase PWM Rectifier.And the application does not use phaselocked loop, saves
The software phlase locking program for having removed additional hardware phase lock high precision element or complexity reduces trigonometric function fortune complicated in phase-locked loop
The problems such as calculation, Rotating Transition of Coordinate, decoupling control, avoids wave distortion or frequency of the phaselocked loop in wind-driven generator output voltage
Accurately and rapidly floating voltage synchronization signal locking phase error can not be caused under rate catastrophe, and then influence wind generator system
The problem of runnability.
Certainly, implement the application any product or method it is not absolutely required to and meanwhile reach all the above excellent
Point.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of application for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of wind generator system provided by the embodiments of the present application；
Fig. 2 is a kind of control method flow chart of Three-Phase PWM Rectifier provided by the embodiments of the present application；
Fig. 3 a is that a kind of output three-phase voltage of wind-driven generator provided by the embodiments of the present application is static in alpha-beta two-phase respectively
Component of voltage schematic diagram under coordinate system and under α *-β * two-phase stationary coordinate system；
Fig. 3 b is a kind of voltage vector u provided by the embodiments of the present applicationref1With voltage vector uref2Synthesis schematic diagram；
Fig. 3 c is inductive current i provided by the embodiments of the present applicationfWith wind-driven generator output voltage uoPhase relation signal
Figure；
Fig. 4 is to provided by the embodiments of the present application a kind of in the case where the output voltage of wind-driven generator is distorted three
Phase PWM rectifier exports simulation waveform；
Fig. 5 is a kind of controling device structure diagram of Three-Phase PWM Rectifier provided by the embodiments of the present application；
Fig. 6 is the controling device structure diagram of another Three-Phase PWM Rectifier provided by the embodiments of the present application；
Fig. 7 is the controling device structure diagram of another Three-Phase PWM Rectifier provided by the embodiments of the present application.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is based on
Embodiment in the application, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall in the protection scope of this application.
The embodiment of the present application provides a kind of control method of Three-Phase PWM Rectifier, applied in wind generator system
Control unit.Referring to Fig. 1, Fig. 1 is a kind of structural schematic diagram of wind generator system provided by the embodiments of the present application, wind-power electricity generation
System includes wind-driven generator, Three-Phase PWM Rectifier, dc-link capacitance C, battery, filter inductance L and its dead resistance R.
Wind-driven generator is connected by filter inductance and dead resistance R with the side that exchanges of Three-Phase PWM Rectifier, Three-Phase PWM Rectifier
DC side is connect with dc-link capacitance C and battery respectively.Wherein, control unit is connect with Three-Phase PWM Rectifier, for
Three-Phase PWM Rectifier output pulse signal, to control Three-Phase PWM Rectifier.
Below in conjunction with specific embodiment, to a kind of controlling party of Three-Phase PWM Rectifier provided by the embodiments of the present application
Method is described in detail, as shown in Figure 2, the specific steps are as follows:
Step 201, the output three-phase voltage of wind-driven generator is transformed into the α shaft voltage under alpha-beta two-phase stationary coordinate system
Component ugαWith β shaft voltage component ugβ。
In the embodiment of the present application, control unit can detecte the output three-phase voltage u of wind-driven generatorga、ugb、ugc, direct current
The voltage U of bus capacitordcWith the electric current I of dc-link capacitancedcAnd the rotational speed omega of wind-driven generator.Control unit can basis
The parameter of detection is handled, and control unit is static in alpha-beta two-phase to the output three-phase voltage of wind-driven generator according to formula (1)
Clarke (Clarke) transformation is carried out under coordinate system, obtains the output three-phase voltage of wind-driven generator in alpha-beta two-phase static coordinate
α shaft voltage component u under system* gαWith β shaft voltage component ugβ。
Shown in mathematical model of the wind generator system under alpha-beta two-phase stationary coordinate system such as lower section formula (2):
Wherein, uga、ugbAnd ugcFor the output three-phase voltage of wind-driven generator, ugαAnd ugβIt is the defeated of wind-driven generator respectively
α shaft voltage component and β shaft voltage component of the three-phase voltage under alpha-beta two-phase stationary coordinate system out, igαAnd igβIt is wind-force hair respectively
α shaft current component and β shaft current component of the output electric current of motor under alpha-beta two-phase stationary coordinate system, ucαAnd ucβIt is three respectively
α shaft voltage component and β shaft voltage component, L of the phase PWM rectifier input voltage under alpha-beta two-phase stationary coordinate system are filtered electrical
Feel the value of L, the value of R dead resistance R.
Step 202, the output three-phase voltage of wind-driven generator is transformed to the α * axis electricity under α *-β * two-phase stationary coordinate system
Press component u* gαWith β * shaft voltage component u* gβ, α *-β * two-phase stationary coordinate system is the two of 90 degree of advanced alpha-beta two-phase stationary coordinate system
Phase rest frame.
In the embodiment of the present application, control unit can according to formula (3) to the output three-phase voltage of wind-driven generator in α *-
Clarke (Clarke) transformation is carried out under β * two-phase stationary coordinate system, obtains the output three-phase voltage of wind-driven generator in α *-β *
α * shaft voltage component u under two-phase stationary coordinate system* gαWith β * shaft voltage component u* gβ。
Wherein, uga、ugbAnd ugcFor the output three-phase voltage of wind-driven generator, u* gαAnd u* gβIt is that α *-β * two-phase is static respectively
α * shaft voltage component and β * shaft voltage component under coordinate system.
Wherein, step 201- step 202 may be performed simultaneously, and can also be first carried out with step 201, be executed after step 202, or
Person's step 202 first carries out, and executes after step 201, and the application is not specifically limited the execution sequence of the two.
Step 203, to the difference of the peak power output of the DC side output power of Three-Phase PWM Rectifier and wind-driven generator
Value carries out PI operation, and operation result is carried out amplitude limiting processing, obtains adjustment factor kcm。
In the embodiment of the present application, control unit can detecte the DC side output power of Three-Phase PWM Rectifier.Specific processing
Process can be with are as follows: calculates the product of the voltage of the dc-link capacitance and the electric current of the dc-link capacitance；By calculating
Product is input to low-pass filter LPF (Low Pass Filter, LPF), obtains the DC side output work of Three-Phase PWM Rectifier
Rate.
Control unit can detecte the peak power output of wind-driven generator, and concrete processing procedure can be with are as follows: described in detection
The revolving speed of wind-driven generator；According to the corresponding relationship of preset peak power output and revolving speed, the wind-driven generator is determined
The peak power output of the corresponding wind-driven generator of revolving speed.
Control unit can calculate the DC side output power of Three-Phase PWM Rectifier and the maximum work output of wind-driven generator
The difference of rate, and PI operation is carried out to difference, and operation result is subjected to amplitude limiting processing, obtain adjustment factor kcm, due to this Shen
Please in the flow direction of electric energy be DC bus to be flowed to from wind-driven generator namely the peak power output of wind-driven generator is answered
This is greater than the DC side output power of Three-Phase PWM Rectifier, so, adjustment factor kcmMeet: kcm>=0, to prevent three-phase PWM
The DC bus direction wind-driven generator reverse charging of rectifier.
Step 204, according to adjustment factor kcmWith α * shaft voltage component u* gα, determine first voltage component, and be according to adjusting
Number kcmWith β * shaft voltage component u* gβ, determine second voltage component.
In the embodiment of the present application, according to adjustment factor kcmWith α * shaft voltage component u* gα, determine first voltage component, and root
According to adjustment factor kcmWith β * shaft voltage component u* gβ, determine that the mode of second voltage component is varied, the embodiment of the present application provides
Following two method of determination:
Mode one: adjustment factor and α * shaft voltage component u are calculated* gαProduct, as first voltage component；It calculates and adjusts
Coefficient and β * shaft voltage component u* gβProduct, as second voltage component.
Mode two: place is normalized to α * shaft voltage component and β * shaft voltage component according to formula (4) and formula (5)
Reason:
(u* gα1)2+(u* gβ1)2=1 (4)
Wherein, u* gαFor α * shaft voltage component, u* gβFor β * shaft voltage component, u* gα1For the α * shaft voltage point after normalization
Amount, u* gβ1For the β * shaft voltage component after normalization；
α * shaft voltage component u after calculating adjustment factor and normalization* gα1Product, as first voltage component；It calculates
β * shaft voltage component u after adjustment factor and normalization* gβ1Product, as second voltage component.
Step 205, α shaft voltage component u is calculatedgαThe sum of with first voltage component, as the first control amount, and β axis is calculated
Component of voltage ugβThe sum of with second voltage component, as the second control amount.
α * shaft voltage component u in the embodiment of the present application, after first voltage component is normalization* gα1With adjustment factor kcm
Product, second voltage component be normalization after β * shaft voltage component u* gβ1With adjustment factor kcmProduct when, first control
Measure Vα=kcm u* gα1+ugα, the second control amount Vβ=kcm u* gβ1+ugβ, it is α * shaft voltage component u in first voltage component* gαWith tune
Save coefficient kcmProduct, second voltage component be β * shaft voltage component u* gβWith adjustment factor kcmProduct when, the first control amount Vα
=kcm u* gα+ugα, the second control amount Vβ=kcm u* gβ+ugβ。
Step 206, space vector pulse width modulation SVPWM is carried out according to the first control amount and the second control amount, generation is used for
Control the pulse signal of each phase bridge arm device for power switching on-off of Three-Phase PWM Rectifier.
In scheme provided by the present application, it is built upon in two-phase stationary coordinate system and Three-Phase PWM Rectifier is controlled, do not have
Have and establish on the virtual dq coordinate system of fixed speed, without Park coordinate transform is carried out, in addition the application without
Phaselocked loop simplifies the structure of control algolithm, improves response speed when control Three-Phase PWM Rectifier.And the application does not have
There is the software phlase locking program for eliminating additional hardware phase lock high precision element or complexity using phaselocked loop, reduces multiple in phase-locked loop
The problems such as miscellaneous trigonometric function operation, Rotating Transition of Coordinate, decoupling control, phaselocked loop is avoided in wind-driven generator output voltage
Wave distortion or frequency discontinuity in the case of accurately and rapidly floating voltage synchronization signal can not cause locking phase error, Jin Erying
The problem of ringing wind generator system runnability.
Referring to Fig. 3 a, Fig. 3 a is the output three-phase voltage of wind-driven generator respectively under alpha-beta two-phase stationary coordinate system and α *-
Component of voltage schematic diagram under β * two-phase stationary coordinate system, wherein ugαAnd ugβThe voltage vector of synthesis is uref1(namely wind-force hair
Motor output voltage uo), u* gαAnd u* gβThe voltage vector of synthesis is uref2.It is voltage vector u referring to Fig. 3 b, Fig. 3 bref1With voltage
Vector uref2Synthesis schematic diagram, wherein voltage vector uref1With voltage vector uref2The voltage vector of synthesis is uref(namely three
Phase PWM rectifier input voltage uref).Due to advanced 90 degree of alpha-beta two-phase stationary coordinate system of α *-β * two-phase stationary coordinate system,
uref2Advanced uref190 degree, as shown in Figure 3b.Pressure drop u in Fig. 1 on inductance LfFor wind-driven generator output voltage uoWith three-phase
PWM rectifier input voltage urefDifference, as shown in Figure 3c.Due to the electric current i on inductance LfLagging voltage uf90 degree, therefore electricity
Inducing current ifWith wind-driven generator output voltage uo180 ° of phase phase difference namely wind-driven generator output electric current and wind-force send out
Motor output voltage uo180 ° of phase phase difference, realize wind-driven generator unity power factor operation.
Referring to fig. 4, Fig. 4 is to be distorted to a kind of output voltage in wind-driven generator provided by the embodiments of the present application
In the case of Three-Phase PWM Rectifier export simulation waveform.From figure 3, it can be seen that the output voltage in wind-driven generator occurs
In the case where distortion, 180 ° of output electric current and the output voltage phase phase difference of wind-driven generator, and the output of wind-driven generator
The sine degree of electric current is preferable, is not affected by the influence of wind-driven generator output voltage waveforms distortion.
Based on the same technical idea, as shown in figure 5, the embodiment of the present application also provides a kind of Three-Phase PWM Rectifiers
Control device, described device are applied to the control unit in wind generator system, and the wind generator system further includes wind-force hair
Motor, Three-Phase PWM Rectifier, dc-link capacitance, the exchange side of the Three-Phase PWM Rectifier and the wind-driven generator connect
It connects, the DC side of the Three-Phase PWM Rectifier is connect with the dc-link capacitance, and described device includes:
First conversion module 501, for the output three-phase voltage of the wind-driven generator to be transformed to the static seat of alpha-beta two-phase
α shaft voltage component u under mark systemgαWith β shaft voltage component ugβ；
Second conversion module 502 is static for the output three-phase voltage of the wind-driven generator to be transformed to α *-β * two-phase
α * shaft voltage component u under coordinate system* gαWith β * shaft voltage component u* gβ, the α *-β * two-phase stationary coordinate system is advanced described
The two-phase stationary coordinate system that 90 degree of alpha-beta two-phase stationary coordinate system；
Adjustment factor generation module 503, for the DC side output power and the wind-force to the Three-Phase PWM Rectifier
The difference of the peak power output of generator carries out PI operation, and carries out amplitude limiting processing to operation result using limiter, obtains
Adjustment factor kcm；
First determining module 504, for according to the adjustment factor kcmWith the α * shaft voltage component u* gα, determine first
Component of voltage, and according to the adjustment factor and the β * shaft voltage component u* gβ, determine second voltage component；
Control amount generation module 505, for calculating the α shaft voltage component ugαThe sum of with the first voltage component, make
For the first control amount, and calculate the β shaft voltage component ugβThe sum of with the second voltage component, as the second control amount；
SVPWM module 506, for carrying out space vector pulse width tune according to first control amount and second control amount
SVPWM processed generates the pulse signal for controlling each phase bridge arm device for power switching on-off of the Three-Phase PWM Rectifier.
Optionally, referring to Fig. 6, first determining module 504, comprising:
First computing unit 5041, for calculating the adjustment factor and the α * shaft voltage component u* gαProduct, as
First voltage component；
Second computing unit 5042, for calculating the adjustment factor and the β * shaft voltage component u* gβProduct, as
Second voltage component.
Optionally, referring to Fig. 7, first determining module, comprising:
Normalization unit 5042, for according to the following formula to the α * shaft voltage component and the β * shaft voltage component into
Row normalized:
(u* gα1)2+(u* gβ1)2=1
Wherein, u* gαFor the α * shaft voltage component, u* gβFor the β * shaft voltage component, u* gα1For the α * axis after normalization
Component of voltage, u* gβ1For the β * shaft voltage component after normalization；
Third computing unit 5043, for the α * shaft voltage component u after calculating the adjustment factor and normalizing* gα1Multiply
Product, as first voltage component；
4th computing unit 5044, for the β * shaft voltage component u after calculating the adjustment factor and normalizing* gβ1Multiply
Product, as second voltage component.
Optionally, referring to Fig. 5, Fig. 6 and Fig. 7, described device further include:
Low-pass filter LPF507, the electric current for voltage and the dc-link capacitance to the dc-link capacitance
Product be filtered, obtain the DC side output power of the Three-Phase PWM Rectifier.
Optionally, referring to Fig. 5, Fig. 6 and Fig. 7, described device further includes maximum power determining module 508；
The maximum power determining module 508, for obtaining the revolving speed of the wind-driven generator；It is defeated according to preset maximum
The corresponding relationship of power and revolving speed out determines the maximum output of the corresponding wind-driven generator of the revolving speed of the wind-driven generator
Power.
In scheme provided by the present application, it is built upon in two-phase stationary coordinate system and Three-Phase PWM Rectifier is controlled, do not have
Have and establish on the virtual dq coordinate system of fixed speed, without Park coordinate transform is carried out, in addition the application without
Phaselocked loop simplifies the structure of control algolithm, improves response speed when control Three-Phase PWM Rectifier.And the application does not have
There is the software phlase locking program for eliminating additional hardware phase lock high precision element or complexity using phaselocked loop, reduces multiple in phase-locked loop
The problems such as miscellaneous trigonometric function operation, Rotating Transition of Coordinate, decoupling control, phaselocked loop is avoided in wind-driven generator output voltage
Wave distortion or frequency discontinuity in the case of accurately and rapidly floating voltage synchronization signal can not cause locking phase error, Jin Erying
The problem of ringing wind generator system runnability.
It should be noted that, in this document, relational terms such as first and second and the like are used merely to a reality
Body or operation are distinguished with another entity or operation, are deposited without necessarily requiring or implying between these entities or operation
In any actual relationship or order or sequence.Moreover, the terms "include", "comprise" or its any other variant are intended to
Non-exclusive inclusion, so that the process, method, article or equipment including a series of elements is not only wanted including those
Element, but also including other elements that are not explicitly listed, or further include for this process, method, article or equipment
Intrinsic element.In the absence of more restrictions, the element limited by sentence "including a ...", it is not excluded that
There is also other identical elements in process, method, article or equipment including the element.
Each embodiment in this specification is all made of relevant mode and describes, same and similar portion between each embodiment
Dividing may refer to each other, and each embodiment focuses on the differences from other embodiments.Especially for device reality
For applying example, since it is substantially similar to the method embodiment, so being described relatively simple, related place is referring to embodiment of the method
Part explanation.
The foregoing is merely the preferred embodiments of the application, are not intended to limit the protection scope of the application.It is all
Any modification, equivalent replacement, improvement and so within spirit herein and principle are all contained in the protection scope of the application
It is interior.
Claims (10)
1. a kind of control method of Three-Phase PWM Rectifier, which is characterized in that the method is applied to the control in wind generator system
Component processed, the wind generator system further include wind-driven generator, Three-Phase PWM Rectifier, dc-link capacitance, the three-phase
The exchange side of PWM rectifier is connect with the wind-driven generator, the DC side of the Three-Phase PWM Rectifier and the DC bus
Capacitance connection, which comprises
The output three-phase voltage of the wind-driven generator is transformed to the α shaft voltage component u under alpha-beta two-phase stationary coordinate systemgαAnd β
Shaft voltage component ugβ；
The output three-phase voltage of the wind-driven generator is transformed into the α * shaft voltage component under α *-β * two-phase stationary coordinate system
u* gαWith β * shaft voltage component u* gβ, the α *-β * two-phase stationary coordinate system is advanced 90 degree of the alpha-beta two-phase stationary coordinate system
Two-phase stationary coordinate system；
To the difference of the peak power output of the DC side output power and wind-driven generator of the Three-Phase PWM Rectifier into
Row PI operation, and operation result is subjected to amplitude limiting processing, obtain adjustment factor kcm；
According to the adjustment factor kcmWith the α * shaft voltage component u* gα, determine first voltage component, and be according to the adjusting
Number kcmWith the β * shaft voltage component u* gβ, determine second voltage component；
Calculate the α shaft voltage component ugαThe sum of with the first voltage component, as the first control amount, and the β axis is calculated
Component of voltage ugβThe sum of with the second voltage component, as the second control amount；
Space vector pulse width modulation SVPWM is carried out according to first control amount and second control amount, is generated for controlling
The pulse signal of each phase bridge arm device for power switching on-off of Three-Phase PWM Rectifier.
2. the method according to claim 1, wherein described according to the adjustment factor kcmWith the α * shaft voltage
Component u* gα, determine first voltage component, and according to the adjustment factor kcmWith the β * shaft voltage component u* gβ, determine the second electricity
Press component, comprising:
Calculate the adjustment factor and the α * shaft voltage component u* gαProduct, as first voltage component；
Calculate the adjustment factor and the β * shaft voltage component u* gβProduct, as second voltage component.
3. the method according to claim 1, wherein described according to the adjustment factor kcmWith the α * shaft voltage
Component u* gα, determine first voltage component, and according to the adjustment factor kcmWith the β * shaft voltage component u* gβ, determine the second electricity
Press component, comprising:
The α * shaft voltage component and the β * shaft voltage component are normalized according to the following formula:
(u* gα1)2+(u* gβ1)2=1
Wherein, u* gαFor the α * shaft voltage component, u* gβFor the β * shaft voltage component, u* gα1For the α * shaft voltage after normalization
Component, u* gβ1For the β * shaft voltage component after normalization；
α * shaft voltage component u after calculating the adjustment factor and normalization* gα1Product, as first voltage component；
β * shaft voltage component u after calculating the adjustment factor and normalization* gβ1Product, as second voltage component.
4. the method according to claim 1, wherein the method also includes:
Calculate the product of the voltage of the dc-link capacitance and the electric current of the dc-link capacitance；
It is filtered using product of the low-pass filter LPF to calculating, obtains the DC side output work of the Three-Phase PWM Rectifier
Rate.
5. the method according to claim 1, wherein the method also includes:
Obtain the revolving speed of the wind-driven generator；
According to the corresponding relationship of preset peak power output and revolving speed, determine that the revolving speed of the wind-driven generator is corresponding described
The peak power output of wind-driven generator.
6. a kind of control device of Three-Phase PWM Rectifier, which is characterized in that described device is applied to the control in wind generator system
Component processed, the wind generator system further include wind-driven generator, Three-Phase PWM Rectifier, dc-link capacitance, the three-phase
The exchange side of PWM rectifier is connect with the wind-driven generator, the DC side of the Three-Phase PWM Rectifier and the DC bus
Capacitance connection, described device include:
First conversion module, for transforming to the output three-phase voltage of the wind-driven generator under alpha-beta two-phase stationary coordinate system
α shaft voltage component ugαWith β shaft voltage component ugβ；
Second conversion module, for the output three-phase voltage of the wind-driven generator to be transformed to α *-β * two-phase stationary coordinate system
Under α * shaft voltage component u* gαWith β * shaft voltage component u* gβ, the α *-β * two-phase stationary coordinate system is the advanced alpha-beta two-phase
The two-phase stationary coordinate system that 90 degree of rest frame；
Adjustment factor generation module, for the DC side output power and the wind-driven generator to the Three-Phase PWM Rectifier
Peak power output difference carry out PI operation, and using limiter to operation result carry out amplitude limiting processing, obtain adjust system
Number kcm；
First determining module, for according to the adjustment factor kcmWith the α * shaft voltage component u* gα, determine first voltage point
Amount, and according to the adjustment factor and the β * shaft voltage component u* gβ, determine second voltage component；
Control amount generation module, for calculating the α shaft voltage component ugαThe sum of with the first voltage component, as the first control
Amount processed, and calculate the β shaft voltage component ugβThe sum of with the second voltage component, as the second control amount；
SVPWM module, for carrying out space vector pulse width modulation according to first control amount and second control amount
SVPWM generates the pulse signal for controlling each phase bridge arm device for power switching on-off of the Three-Phase PWM Rectifier.
7. device according to claim 6, which is characterized in that first determining module, comprising:
First computing unit, for calculating the adjustment factor and the α * shaft voltage component u* gαProduct, as first voltage
Component；
Second computing unit, for calculating the adjustment factor and the β * shaft voltage component u* gβProduct, as second voltage
Component.
8. device according to claim 6, which is characterized in that first determining module, comprising:
Normalization unit, for the α * shaft voltage component and the β * shaft voltage component to be normalized according to the following formula
Processing:
(u* gα1)2+(u* gβ1)2=1
Wherein, u* gαFor the α * shaft voltage component, u* gβFor the β * shaft voltage component, u* gα1For the α * shaft voltage after normalization
Component, u* gβ1For the β * shaft voltage component after normalization；
Third computing unit, for the α * shaft voltage component u after calculating the adjustment factor and normalizing* gα1Product, as
One component of voltage；
4th computing unit, for the β * shaft voltage component u after calculating the adjustment factor and normalizing* gβ1Product, as
Two component of voltage.
9. device according to claim 6, which is characterized in that described device further include:
Low-pass filter LPF, the product of the electric current for voltage and the dc-link capacitance to the dc-link capacitance
It is filtered, obtains the DC side output power of the Three-Phase PWM Rectifier.
10. device according to claim 6, which is characterized in that described device further includes maximum power determining module；
The maximum power determining module, for obtaining the revolving speed of the wind-driven generator；According to preset peak power output
With the corresponding relationship of revolving speed, the peak power output of the corresponding wind-driven generator of the revolving speed of the wind-driven generator is determined.
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