CN109347125A - A kind of PWM rectifier control method and device - Google Patents
A kind of PWM rectifier control method and device Download PDFInfo
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- CN109347125A CN109347125A CN201811089595.7A CN201811089595A CN109347125A CN 109347125 A CN109347125 A CN 109347125A CN 201811089595 A CN201811089595 A CN 201811089595A CN 109347125 A CN109347125 A CN 109347125A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/26—Arrangements for eliminating or reducing asymmetry in polyphase networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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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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- 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
- Y02E40/40—Arrangements for reducing harmonics
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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
- Y02E40/50—Arrangements for eliminating or reducing asymmetry in polyphase networks
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Abstract
The invention discloses a kind of PWM rectifier control method and devices.It is related to power electronics field；The parameter instability problem that PWM rectifier encounters in practical applications can be well solved.The PWM rectifier control method includes: to calculate the fundametal compoment and corresponding postpones signal of grid side voltage, grid side electric current and transducer side voltage；Using identification model and the fundametal compoment of the grid side voltage, grid side electric current and transducer side voltage and corresponding postpones signal, transducer side voltage prediction value is calculated；According to the transducer side voltage prediction value, by space vector width pulse modulation method, the driving pulse for driving power pipe is obtained.The PWM rectifier control device includes: Parameter Calculation module, for calculating basic parameter；Transducer side voltage prediction value is calculated for utilizing the parameter identification module in parameter identification module；Driving power module, for driving pulse to be calculated according to transducer side voltage prediction value.
Description
Technical field
The present invention relates to power electronics field, a kind of PWM rectifier control method and device are particularly related to.
Background technique
Pulse width modulate (Pulse Width Modulation, PWM) rectifier have energy in bidirectional flow, power because
Number is adjustable, and grid side current sinusoidal and the adjustable feature of busbar voltage are widely applied.In practical applications, PWM is rectified
Device can encounter the unstable problem of system parameter, and system parameter is unstable mainly by the unstable institute of environment temperature where system
Cause.System parameter variations will cause control performance decline, be embodied in current on line side distortion, and harmonic wave increases, power factor
It reduces, serious to may result in system unstable.Parameters variation makes a big impact to system, especially to system parameter according to
The influence of the higher predictive control algorithm of Lai Du is very big.Therefore, it is badly in need of solving the parameter that PWM rectifier encounters in practical applications
Instability problem.
Summary of the invention
In view of this, it is an object of the invention to propose that one kind can pick out the accurate parameter value of system to solve to be
The PWM rectifier control method and device of system parameter instability problem.
Based on above-mentioned purpose, the present invention provides a kind of PWM rectifier control methods, comprising:
Calculate grid side voltage, grid side electric current and the fundametal compoment of transducer side voltage and prolonging for the fundametal compoment
Slow signal；
Using identification model, according to the fundamental wave of the grid side voltage, grid side electric current and transducer side voltage
The postpones signal of component and the fundametal compoment obtains inductance parameters by identification, and is calculated according to the inductance parameters
Transducer side voltage prediction value；Wherein, the identification model is introduced by combining the complex vector equation of PWM rectifier
The least square method of recursion of forgetting factor and obtain；
According to the transducer side voltage prediction value, by space vector width pulse modulation method, obtain for driving power
The driving pulse of pipe.
Optionally, described to calculate grid side voltage, the fundametal compoment of grid side electric current and transducer side voltage and described
The postpones signal of fundametal compoment includes:
The grid side voltage, grid side electric current and transducer side voltage are indicated that formal argument is quiet to two-phase from three-phase
Only under coordinate system, the two-phase representation of the grid side voltage, grid side electric current and transducer side voltage is obtained；
The fundametal compoment of the grid side voltage, grid side electric current and transducer side voltage is extracted, and passes through positive-negative sequence
Extraction method obtains the positive-sequence component and negative sequence component of the grid side voltage, grid side electric current and transducer side voltage；
The delay letter of the fundametal compoment of the grid side voltage, grid side electric current and transducer side voltage is calculated
Number.
Optionally, it is described by the grid side voltage, grid side electric current and transducer side voltage from three-phase representation
It transforms under two-phase stationary coordinate system, obtains the two-phase table of the grid side voltage, grid side electric current and transducer side voltage
Show form specifically:
It is according to transformation for mula that the grid side voltage, grid side electric current and transducer side voltage transformation is static to two-phase
Under coordinate system；
The transformation for mula are as follows:
Wherein, eα、eβIt indicates to fasten the voltage signal of α phase and β phase, e in static coordinatea、eb、ecRespectively three-phase sampling electricity
Voltage on line side；
Wherein, vα、vβIt indicates to fasten the voltage signal of α phase and β phase, v in static coordinatea、vb、vcRespectively three-phase sampling becomes
Parallel operation side voltage；
Wherein, iα、iβIt indicates to fasten the current signal of α phase and β phase, i in static coordinatea、ib、icRespectively three-phase sampling electricity
Net side electricity.
Optionally, described to utilize identification model, according to the grid side voltage, grid side electric current and transducer side
The postpones signal of the fundametal compoment of voltage and the fundametal compoment obtains inductance parameters by identification, and is joined according to the inductance
Number is calculated transducer side voltage prediction value and includes:
Using the identification model, according to the grid side voltage, grid side electric current and transducer side voltage
The postpones signal of fundametal compoment and the fundametal compoment obtains the inductance parameters by identification；
The transducer side voltage prediction value is calculated using direct Power Control method according to the inductance parameters.
Optionally, the construction method of the identification model includes:
Conclude unified representation form of the complex vector equation for obtaining PWM rectifier under balance power grid and unbalanced power grid；
Unified representation form of the complex vector equation of the PWM rectifier under balance power grid and unbalanced power grid are as follows:
Y (k)=h (k) θ
Wherein, y (k) indicates output data, and h (k) indicates sampled data, and θ is parameter to be estimated；
Power grid and the unified representation form under unbalanced power grid are being balanced according to the complex vector equation of the PWM rectifier,
In conjunction with the input and output discrete system model of PWM rectifier, the estimated value of parameter to be estimated is obtainedLeast square method indicate
Form；
The estimated valueLeast square method representation are as follows:
Wherein, H indicates sampled data, and Y indicates output data；
It is derived by the estimated value of the parameter to be estimatedLeast square method of recursion representation；
The estimated value of the parameter to be estimatedLeast square method of recursion representation are as follows:
Wherein, η (k) is gain matrix, and φ (k) is covariance matrix；
Forgetting factor is introduced, the estimated value of the parameter to be estimated is obtainedIntroducing forgetting factor recursive least-squares
The representation of method, i.e. identification model；
Wherein, η (k) is gain matrix, and φ (k) is covariance matrix, and ρ indicates forgetting factor.
Optionally, described to utilize the identification model, according to the grid side voltage, grid side electric current and transformation
The fundametal compoment of device side voltage and the postpones signal of the fundametal compoment obtain the inductance parameters by identification specifically:
According to the fundametal compoment and the fundametal compoment of the grid side voltage, grid side electric current and transducer side voltage
Postpones signal acquire estimated value using the identification model
The inductance parameters can be byIt acquires.
Optionally, described that the transducer side is calculated using direct Power Control method according to the inductance parameters
Voltage prediction value specifically:
Using the direct Power Control based on extension reactive power definition, by transducer side voltage vector is calculated:
Wherein,Indicate transducer side voltage；Respectively indicate the α phase and β phase of the transducer side voltage
Component；All parameter upper right footmark k indicate corresponding parameter in the value at k moment；
The transducer side voltage prediction value can indicate are as follows:
Wherein,Indicate transducer side voltage prediction value；Respectively indicate the transducer side electricity
The α phase and β phase component of pressure prediction value；All parameters
Upper right footmark k+1 indicates corresponding parameter in the value at k+1 moment.
Optionally, described to be used according to the transducer side voltage prediction value by space vector width pulse modulation method
Include: in the driving pulse of driving power pipe
The transducer side is judged using space vector width pulse modulation method according to the transducer side voltage prediction value
The resolution of vectors of the transducer side voltage prediction value is a zero vector and two by sector where the vector of voltage prediction value
Non-zero vector；
The action time of one zero vector and two non-zero vectors is calculated, to obtain described for driving function
The driving pulse of rate pipe.
It is optionally, described that one zero vector and two non-zero vector action times is calculated specifically:
The calculation formula of one zero vector and two non-zero vector action time are as follows:
Wherein, TkIndicate the action time of k vector in described two non-zero vectors, Tk+1Indicate described two non-zero vectors
The action time of middle k+1 vector, T0Indicate the action time of the zero vector, TsIndicate the working time period of PWM rectifier；The α phase and β phase component of the respectively described transducer side voltage prediction value.
The present invention also provides a kind of PWM rectifier control devices, comprising:
Parameter Calculation module, for calculating the fundamental wave of grid side voltage, grid side electric current and transducer side voltage
The postpones signal of component and the fundametal compoment；
Parameter identification module, for utilizing identification model, according to the grid side voltage, grid side electric current and change
The fundametal compoment of parallel operation side voltage and the postpones signal of the fundametal compoment, identification obtain inductance parameters, and according to the inductance
Transducer side voltage prediction value is calculated in parameter；
Driving power module, for according to the transducer side voltage prediction value, by space vector width pulse modulation method,
Obtain the driving pulse for driving power pipe.
From the above it can be seen that a kind of PWM rectifier control method provided by the invention and device utilize online ginseng
The method of number identification obtains accurate system parameter, improves system for the robustness of parameter, can well solve system
The unstable problem of parameter；Meanwhile compared to traditional Model Predictive Control scheme, PWM rectifier controlling party provided by the invention
Method and device can guarantee grid side current sinusoidal and reduce active pulsation when inductance parameters mismatch；It is based on compared to tradition
The application of the power prediction control of least square method of recursion parameter identification, PWM rectifier control method provided by the invention and dress
Setting can be in unbalanced power supply and containing harmonic wave under conditions of obtains dynamic property well.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, 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 invention 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 PWM rectifier control method schematic diagram in the embodiment of the present invention；
Fig. 2 is the control principle schematic diagram of PWM rectifier control method in the embodiment of the present invention；
Fig. 3 is calculating grid side voltage, grid side electric current and the change of PWM rectifier control method in the embodiment of the present invention
The method schematic diagram of the postpones signal of the fundametal compoment and fundametal compoment of parallel operation side voltage；
Fig. 4 is the utilization identification model of PWM rectifier control method in the embodiment of the present invention, obtains electricity by identification
Feel parameter, and the method schematic diagram of transducer side voltage prediction value is calculated according to inductance parameters；
Fig. 5 is the schematic diagram of construction method of identification model in PWM rectifier control method in the embodiment of the present invention；
Fig. 6 be the embodiment of the present invention in PWM rectifier control method according to transducer side voltage prediction value, pass through space
Vector Pulse Width Modulation method obtains the method schematic diagram of driving pulse；
Fig. 7 is optimal voltage vector distribution schematic diagram on space vector pulse width modulation complex plane；
Fig. 8 is the structural schematic diagram of PWM rectifier control device in the embodiment of the present invention；
Fig. 9 is experimental steady state waveform diagram of the PWM rectifier control method under ideal power grid in the embodiment of the present invention；
Figure 10 be in the embodiment of the present invention PWM rectifier control method network deformation (a phase voltage falls 50%, -5 times
Harmonic content 10%, 7 subharmonic contents 10%) under initial inductance be 2mH when experiment start waveform diagram；
Figure 11 be in the embodiment of the present invention PWM rectifier control method network deformation (a phase voltage falls 50%, -5 times
Harmonic content 10%, 7 subharmonic contents 10%) under initial inductance be 2mH when experiment start waveform diagram；
Figure 12 be in the embodiment of the present invention PWM rectifier control method network deformation (a phase voltage falls 50%, -5 times
Harmonic content 10%, 7 subharmonic contents 10%) under initial inductance be 30mH when experiment start waveform diagram；
Figure 13 be in the embodiment of the present invention PWM rectifier control method network deformation (a phase voltage falls 50%, -5 times
Harmonic content 10%, 7 subharmonic contents 10%) under initial inductance be 30mH when experiment start waveform diagram；
Figure 14 be in the embodiment of the present invention PWM rectifier control method network deformation (a phase voltage falls 50%, -5 times
Harmonic content 10%, 7 subharmonic contents 10%) under initial inductance be 2mH when a phase current THD analysis chart；
Figure 15 is that in network deformation, (a phase voltage falls 50% to Rectifier, -5 subharmonic in the embodiment of the present invention
Content 10%, 7 subharmonic contents 10%) under initial inductance be 2mH, identification stablize after a phase current THD analysis chart；
Figure 16 is that in network deformation, (a phase voltage falls 50% to Rectifier, -5 subharmonic in the embodiment of the present invention
Content 10%, 7 subharmonic contents 10%) under initial inductance be 30mH when a phase current THD analysis chart；
Figure 17 is that in network deformation, (a phase voltage falls 50% to Rectifier, -5 subharmonic in the embodiment of the present invention
Content 10%, 7 subharmonic contents 10%) under initial inductance be 30mH, identification stablize after a phase current THD analysis chart.
Specific embodiment
To make the objectives, technical solutions, and advantages of the present invention clearer, below in conjunction with specific embodiment, and reference
Attached drawing, the present invention is described in more detail.
One aspect of the present invention provides a kind of PWM rectifier control method.
As shown in Figure 1, 2, in a kind of embodiment of PWM rectifier control method provided by the invention, the method packet
It includes:
S101: the fundametal compoment and the fundamental wave point of grid side voltage, grid side electric current and transducer side voltage are calculated
The postpones signal of amount；
S102: identification model is utilized, according to the grid side voltage, grid side electric current and transducer side voltage
The postpones signal of fundametal compoment and the fundametal compoment, identification obtains inductance parameters, and is calculated according to the inductance parameters
Transducer side voltage prediction value；Wherein, the identification model is introduced by combining the complex vector equation of PWM rectifier
The least square method of recursion of forgetting factor and obtain；
S103: it is obtained by space vector width pulse modulation method for driving according to the transducer side voltage prediction value
The driving pulse of power tube.
As shown in figure 3, in a kind of embodiment of PWM rectifier control method provided by the invention, the calculating power grid
The postpones signal of side voltage, the fundametal compoment of grid side electric current and transducer side voltage and the fundametal compoment includes:
S301: by the grid side voltage, grid side electric current and transducer side voltage from three-phase indicate formal argument to
Under two-phase stationary coordinate system, the two-phase representation of the grid side voltage, grid side electric current and transducer side voltage is obtained；
S302: the fundametal compoment of the grid side voltage, grid side electric current and transducer side voltage is extracted, respectively
ef,ifAnd vf, and the grid side voltage, grid side electric current and transducer side voltage are being obtained just by positive-negative sequence extraction method
Order components and negative sequence component, respectively ef +, ef -And if +, if -And vf +, vf -；
S303: prolonging for the fundamental signal of the grid side voltage, grid side electric current and transducer side voltage is calculated
Slow signal, respectively ef′,if' and vf′。
It is described by the grid side voltage, electricity in a kind of embodiment of PWM rectifier control method provided by the invention
Current on line side and transducer side voltage indicate under formal argument to two-phase stationary coordinate system from three-phase, obtain the grid side electricity
The two-phase representation of pressure, grid side electric current and transducer side voltage specifically:
It is according to transformation for mula that the grid side voltage, grid side electric current and transducer side voltage transformation is static to two-phase
Under coordinate system；
The transformation for mula are as follows:
Wherein, eα、eβIt indicates to fasten the voltage signal of α phase and β phase, e in static coordinatea、eb、ecRespectively three-phase sampling electricity
Voltage on line side；
Wherein, vα、vβIt indicates to fasten the voltage signal of α phase and β phase, v in static coordinatea、vb、vcRespectively three-phase sampling becomes
Parallel operation side voltage；
Wherein, iα、iβIt indicates to fasten the current signal of α phase and β phase, i in static coordinatea、ib、icRespectively three-phase sampling electricity
Net side electricity.
It is described that the grid side is calculated in a kind of embodiment of PWM rectifier control method provided by the invention
The postpones signal of the fundamental signal of voltage, grid side electric current and transducer side voltage specifically:
ef'=- jef ++jef -
The postpones signal e of the fundamental signal of grid side voltagef' obtained for the current demand signal delay a quarter period；
if'=- jif ++jif -
The postpones signal i of the fundamental signal of grid side electric currentf' obtained for the current demand signal delay a quarter period；
vf'=- jvf ++jvf -
The postpones signal v of the fundamental signal of transducer side voltagef' obtained for the current demand signal delay a quarter period.
As shown in figure 4, in a kind of embodiment of PWM rectifier control method provided by the invention, it is described to utilize parameter
Model is recognized, is believed according to the fundametal compoment of the grid side voltage, grid side electric current and transducer side voltage and addressed wave
Number postpones signal, inductance parameters are obtained by identification, and transducer side voltage prediction are calculated according to the inductance parameters
Value includes:
S401: utilizing the identification model, according to the grid side voltage, grid side electric current and transducer side electricity
The postpones signal of the fundametal compoment of pressure and the fundametal compoment obtains the inductance parameters by identification；
S402: it is pre- that the transducer side voltage is calculated using direct Power Control method according to the inductance parameters
Measured value.
As shown in figure 5, in a kind of embodiment of PWM rectifier control method provided by the invention, the parameter identification
The construction method of model includes:
S501: unified representation of the complex vector equation for obtaining PWM rectifier under balance power grid and unbalanced power grid is concluded
Form；
The complex vector equation of the PWM rectifier are as follows:
Have in the case where balancing grid conditions
Then, in the case where balancing grid conditions, the complex vector equation of the PWM rectifier can be indicated are as follows:
It willIt is denoted as y (k), indicates output data；It willIt is denoted as h (k), table
Show sampled data；It willIt is denoted as θ, indicates parameter to be estimated；
I.e. in the case where balancing grid conditions, the complex vector equation of the PWM rectifier can be indicated are as follows:
Y (k)=h (k) θ
Have under the conditions of unbalanced power grid
Then, under the conditions of unbalanced power grid, the complex vector equation of the PWM rectifier can be indicated are as follows:
It willIt is denoted as y (k), indicates output data；It willIt is denoted as h (k),
Indicate sampled data；It willIt is denoted as θ, indicates parameter to be estimated；
I.e. under the conditions of unbalanced power grid, the complex vector equation of the PWM rectifier can be indicated are as follows:
Y (k)=h (k) θ
Unified representation form of the complex vector equation of the PWM rectifier under balance power grid and unbalanced power grid as a result,
Are as follows:
Y (k)=h (k) θ
Wherein, y (k) indicates output data, and h (k) indicates sampled data, and θ is parameter to be estimated；
S502: according to unified representation of the complex vector equation of the PWM rectifier under balance power grid and unbalanced power grid
Form obtains the estimated value of parameter to be estimated in conjunction with the input and output discrete system model of PWM rectifierLeast square method
Representation；
The input and output discrete system model of the PWM rectifier is divided into single-input single-output discrete system model and how defeated
Enter to export discrete system model；
The single-input single-output discrete system model are as follows:
y(k)+a1y(k-1)+···+any(k-na)
=b1u(k-1)+b2u(k-2)+···+bnu(k-nb)+e(k)
Wherein, y (k) indicates the output quantity of system, and u (k) indicates the input quantity of system, a1,a2,…,anAnd b1,b2,…,bn
For system parameter, na, nbMeet na+nb=n, n are system order；E (k) indicates to include that actual interference, measurement error and sampling miss
Systematic error including difference；
Then have
Under the conditions of single-input single-output, the least squares formalism of discrete system are as follows:
Y (k)=h (k)Tθ+e(k)
Under the conditions of Multiinputoutput, the least squares formalism of discrete system are as follows:
Y=HTθ+E
Wherein,
Define criterion function
It is found that the estimated value of the parameter to be estimatedIt can be by obtaining criterion function J (θ) minimization, i.e.,
First-order partial derivative is asked to the criterion function J (θ)It obtains；
The estimated value of the parameter to be estimatedLeast square method representation are as follows:
Wherein, H indicates sampled data, and Y indicates output data；
S503: it is derived by the estimated value of the parameter to be estimatedLeast square method of recursion representation；
Estimated value described in the k momentIt indicates are as follows:
Wherein, each parameter bottom right footmark k indicates the value at corresponding k moment,
(Hk THk)-1For covariance matrix, it is denoted as φ (k)；
The covariance matrix specifically:
It is available
φ-1(k)=φ-1(k-1)+h(k)hT(k)
Then, estimated value described in the k-1 momentIt can indicate are as follows:
It is available
Estimated value described in the k moment as a result,It can indicate are as follows:
Wherein, η (k)=φ (k) h (k) is gain matrix；
Again by φ-1(k) the expression formula φ of value-1(k)=φ-1(k-1)+h(k)hT(k) it obtains
The gain matrix η (k) can indicate are as follows:
It obtains
φ (k)=[1- η (k) hT(k)]φ(k-1)
Arrange the estimated value that can obtain the parameter to be estimatedLeast square method of recursion representation are as follows:
Wherein, η (k) is gain matrix, and φ (k) is covariance matrix；
S504: forgetting factor is introduced, the estimated value of the parameter to be estimated is obtainedIntroducing forgetting factor recursion most
The representation of small square law, i.e. identification model；
Define new covariance matrix:
φ-1(k)=ρ φ-1(k-1)+h(k)hT(k)
Wherein, ρ (0 < ρ≤1) is forgetting factor；
Arrangement can be derived and obtain the estimated value of the parameter to be estimatedIntroducing forgetting factor recursive least-squares
The representation of method:
Wherein, η (k) is gain matrix, and φ (k) is covariance matrix, and ρ is forgetting factor；
The estimated value of parameter to be estimated described aboveIntroducing forgetting factor least square method of recursion representation
The as described identification model.
It is described to utilize the parameter identification mould in a kind of embodiment of PWM rectifier control method provided by the invention
Type, according to the grid side voltage, grid side electric current and the fundametal compoment of transducer side voltage and prolonging for the fundametal compoment
Slow signal obtains the inductance parameters by identification specifically:
According to the fundametal compoment and the fundametal compoment of the grid side voltage, grid side electric current and transducer side voltage
Postpones signal acquire estimated value using the identification model
The inductance parameters can be byIt acquires.
It is described according to the inductance parameters in a kind of embodiment of PWM rectifier control method of body of the present invention, make
With direct Power Control method, the transducer side voltage prediction value is calculated specifically:
Using the direct Power Control method based on extension reactive power definition, described based on extension reactive power definition
Direct Power Control method in, define the reactive power of system are as follows:
Wherein,Indicate the point multiplication operation of plural number,
The differential of the postpones signal of grid side voltage and grid side voltage are as follows:
Wherein, e indicates grid side voltage, the postpones signal of e ' expression grid side voltage；
The differential of corresponding grid side electric current are as follows:
Wherein, i indicates that grid side electric current, v indicate transducer side voltage；
The differential of active power and the differential of extension reactive power are respectively as follows:
Wherein, p is active power, qnovFor reactive power；
It is available according to power dead beat theory:
By calculating available transducer side voltage reference vector are as follows:
Wherein,Indicate transducer side voltage；Respectively indicate the α axis and β axis of the transducer side voltage
Component； Indicate multiplication cross operation；All parameter upper right footmark k indicate corresponding ginseng
Measure the value at the k moment；
The grid side electric current of subsequent time can indicate are as follows:
The grid side voltage of subsequent time can be expressed as
Wherein, TsIndicate the working time period of PWM rectifier；
The then active power of subsequent time are as follows:
Subsequent time extends reactive power are as follows:
Wherein, tscThe time in period is controlled for one；
The predicted value of the transducer side voltage are as follows:
Wherein,Indicate transducer side voltage prediction value；Respectively indicate the transducer side electricity
The α phase and β phase component of pressure prediction value；All parameters
Upper right footmark k+1 indicates corresponding parameter in the value at k+1 moment.
As shown in fig. 6, in a kind of embodiment of PWM rectifier control method provided by the invention, it is described according to
Transducer side voltage prediction value, by space vector width pulse modulation method, obtain include: for the driving pulse of driving power pipe
S601: as shown in fig. 7, being sentenced according to the transducer side voltage prediction value using space vector width pulse modulation method
The resolution of vectors of the transducer side voltage prediction value is one by sector where the vector for the transducer side voltage prediction value of breaking
A zero vector and two non-zero vectors；
S602: being calculated the action time of one zero vector and two non-zero vectors, to obtain described be used for
The driving pulse of driving power pipe.
It is described to be calculated one zero in a kind of embodiment of PWM rectifier control method provided by the invention
The action time of vector and two non-zero vectors specifically:
Wherein, TkIndicate the action time of k vector in described two non-zero vectors, Tk+1Indicate described two non-zero vectors
The action time of middle k+1 vector, T0Indicate the action time of the zero vector, TsIndicate the working time period of PWM rectifier；The α phase and β phase component of the respectively described transducer side voltage prediction value.
On the other hand, the present invention also provides a kind of PWM rectifier control devices.
As shown in figure 8, described device includes: in a kind of embodiment of PWM rectifier control device provided by the invention
Parameter Calculation module 801 calculates the fundamental wave point of grid side voltage, grid side electric current and transducer side voltage
The postpones signal of amount and the fundametal compoment；
Parameter identification module 802, using identification model, according to the grid side voltage, grid side electric current and change
The fundametal compoment of parallel operation side voltage and the postpones signal of the fundametal compoment obtain inductance parameters by identification, and according to described
Transducer side voltage prediction value is calculated in inductance parameters；
Driving power module 803, according to the transducer side voltage prediction value, by space vector width pulse modulation method,
Obtain the driving pulse for driving power pipe.
The device of above-described embodiment for realizing method corresponding in previous embodiment there is corresponding method to implement
The beneficial effect of example, details are not described herein.
As shown in Fig. 9,10,11,12,13, Fig. 9 is PWM rectifier control method in the embodiment of the present invention in ideal power grid
Under experimental steady state waveform diagram；Figure 10,11 are PWM rectifier control method in the embodiment of the present invention in network deformation (a phase voltage
Fall 50%, -5 subharmonic contents 10%, 7 subharmonic contents 10%) under initial voltage be 2mH when experiment start waveform diagram；
Figure 12,13 are that in network deformation, (a phase voltage falls 50% to PWM rectifier control method, and -5 subharmonic contain in the embodiment of the present invention
Amount 10%, 7 subharmonic contents 10%) under initial voltage be 30mH when experiment start waveform diagram.It can be seen by observing waveform
Out at above-mentioned three kinds, PWM rectifier control method provided by the invention can make inductance identifier fast and stable, and
Busbar voltage can be made to stablize in reference value after inductance identifier is stablized, guarantee that three-phase current is sinusoidal, active and reactive power
Only minor fluctuations.
As shown in Figure 14,15,16,17, Figure 14 is PWM rectifier control method in the embodiment of the present invention in network deformation (a
Phase voltage falls 50%, -5 subharmonic contents 10%, 7 subharmonic contents 10%) under initial inductance be 2mH when a phase current THD
Analysis chart, wherein a phase current THD is 3.019%；Figure 15 is that PWM rectifier control method is electric in distortion in the embodiment of the present invention
Initial inductance is 2mH under net (a phase voltage falls 50%, -5 subharmonic contents 10%, 7 subharmonic contents 10%), and identification is stablized
A phase current THD analysis chart afterwards, wherein a phase current THD is 2.1998%；Figure 16 is rectifier controlling party in the embodiment of the present invention
Method initial inductance under network deformation (a phase voltage falls 50%, -5 subharmonic contents 10%, 7 subharmonic contents 10%) is
A phase current THD analysis chart when 30mH, wherein a phase current THD is 7.4956%；Figure 17 is rectifier in the embodiment of the present invention
Control method initial electricity under network deformation (a phase voltage falls 50%, -5 subharmonic contents 10%, 7 subharmonic contents 10%)
Sense is 30mH, a phase current THD analysis chart after identification is stablized, wherein a phase current THD is 2.3814% after identification is stablized.It can see
PWM rectifier control method proposed by the present invention is utilized out, and a current distortion rate can be made to reduce, use function power, idle function
The fluctuation of rate reduces, to realize the strong robustness of system.
It should be understood by those ordinary skilled in the art that: the discussion of any of the above embodiment is exemplary only, not
It is intended to imply that the scope of the present disclosure (including claim) is limited to these examples；Under thinking of the invention, above embodiments
Or can also be combined between the technical characteristic in different embodiments, step can be realized with random order, and be existed such as
Many other variations of the upper different aspect of the invention, for simplicity, they are not provided in details.
In addition, to simplify explanation and discussing, and in order not to obscure the invention, it can in provided attached drawing
It is connect with showing or can not show with the well known power ground of integrated circuit (IC) chip and other components.Furthermore, it is possible to
Device is shown in block diagram form, to avoid obscuring the invention, and this has also contemplated following facts, i.e., about this
The details of the embodiment of a little block diagram arrangements be height depend on will implementing platform of the invention (that is, these details should
It is completely within the scope of the understanding of those skilled in the art).Elaborating that detail (for example, circuit) is of the invention to describe
In the case where exemplary embodiment, it will be apparent to those skilled in the art that can be in these no details
In the case where or implement the present invention in the case that these details change.Therefore, these descriptions should be considered as explanation
Property rather than it is restrictive.
Although having been incorporated with specific embodiments of the present invention, invention has been described, according to retouching for front
It states, many replacements of these embodiments, modifications and variations will be apparent for those of ordinary skills.Example
Such as, discussed embodiment can be used in other memory architectures (for example, dynamic ram (DRAM)).
The embodiment of the present invention be intended to cover fall into all such replacements within the broad range of appended claims,
Modifications and variations.Therefore, all within the spirits and principles of the present invention, any omission, modification, equivalent replacement, the improvement made
Deng should all be included in the protection scope of the present invention.
Claims (9)
1. a kind of PWM rectifier control method characterized by comprising
Calculate grid side voltage, grid side electric current and transducer side voltage fundametal compoment and and the fundametal compoment delay
Signal；
Using identification model, according to the fundametal compoment of the grid side voltage, grid side electric current and transducer side voltage
With the postpones signal of the fundametal compoment, inductance parameters are obtained by identification, and transformation is calculated according to the inductance parameters
Device side voltage prediction value；Wherein, the identification model is forgotten by combining to introduce the complex vector equation of PWM rectifier
The least square method of recursion of the factor and obtain；
According to the transducer side voltage prediction value, by space vector width pulse modulation method, obtain for driving power pipe
Driving pulse.
2. the method according to claim 1, wherein the calculating grid side voltage, grid side electric current and change
The fundametal compoment of parallel operation side voltage and the postpones signal of the fundametal compoment include:
Indicate formal argument to two-phase static seat from three-phase the grid side voltage, grid side electric current and transducer side voltage
Under mark system, the two-phase representation of the grid side voltage, grid side electric current and transducer side voltage is obtained；
The fundametal compoment of the grid side voltage, grid side electric current and transducer side voltage is extracted, and is extracted by positive-negative sequence
Method obtains the positive-sequence component and negative sequence component of the grid side voltage, grid side electric current and transducer side voltage；
The postpones signal of the fundametal compoment of the grid side voltage, grid side electric current and transducer side voltage is calculated.
3. the method according to claim 1, wherein described utilize identification model, according to the grid side
The postpones signal of voltage, the fundametal compoment of grid side electric current and transducer side voltage and the fundametal compoment, by recognizing
To inductance parameters, and transducer side voltage prediction value is calculated according to the inductance parameters and includes:
Using the identification model, according to the fundamental wave of the grid side voltage, grid side electric current and transducer side voltage
The postpones signal of component and the fundametal compoment obtains the inductance parameters by identification；
The transducer side voltage prediction value is calculated using direct Power Control method according to the inductance parameters.
4. the method according to claim 1, wherein the construction method of the identification model includes:
Conclude unified representation form of the complex vector equation for obtaining PWM rectifier under balance power grid and unbalanced power grid；
Unified representation form of the complex vector equation of the PWM rectifier under balance power grid and unbalanced power grid are as follows:
Y (k)=h (k) θ
Wherein, y (k) indicates output data, and h (k) indicates sampled data, and θ is parameter to be estimated；
Power grid and the unified representation form under unbalanced power grid are being balanced according to the complex vector equation of the PWM rectifier, in conjunction with
The input and output discrete system model of PWM rectifier, obtains the estimated value of parameter to be estimatedLeast square method representation；
The estimated valueLeast square method representation are as follows:
Wherein, H indicates sampled data, and Y indicates output data；
It is derived by the estimated value of the parameter to be estimatedLeast square method of recursion representation；
The estimated value of the parameter to be estimatedLeast square method of recursion representation are as follows:
Wherein, η (k) is gain matrix, and φ (k) is covariance matrix；
Forgetting factor is introduced, the estimated value of the parameter to be estimated is obtainedIntroducing forgetting factor least square method of recursion
Representation, i.e. identification model；
Wherein, η (k) is gain matrix, and φ (k) is covariance matrix, and ρ indicates forgetting factor.
5. passing through the method according to claim 1, wherein described according to the transducer side voltage prediction value
Space vector width pulse modulation method, obtain include: for the driving pulse of driving power pipe
The transducer side voltage is judged using space vector width pulse modulation method according to the transducer side voltage prediction value
The resolution of vectors of the transducer side voltage prediction value is three basic vectors by sector where the vector of predicted value；
The three basic vector action time is calculated, to obtain the driving pulse for being used for driving power pipe.
6. according to the method described in claim 3, it is characterized in that, described utilize the identification model, according to the electricity
The postpones signal of voltage on line side, the fundametal compoment of grid side electric current and transducer side voltage and the fundametal compoment, by distinguishing
Knowledge obtains the inductance parameters specifically:
According to the grid side voltage, grid side electric current and the fundametal compoment of transducer side voltage and prolonging for the fundametal compoment
Slow signal acquires estimated value using the identification model
The inductance parameters can be byIt acquires.
7. according to the method described in claim 3, using Direct Power control it is characterized in that, described according to the inductance parameters
The transducer side voltage prediction value is calculated in method processed specifically:
Using the direct Power Control based on extension reactive power definition, by transducer side voltage vector is calculated:
Wherein,Indicate transducer side voltage；Respectively indicate the α phase and β phase component of the transducer side voltage；All parameter upper right footmark k indicate corresponding parameter in the value at k moment；
The transducer side voltage prediction value can indicate are as follows:
Wherein,Indicate transducer side voltage prediction value；It is pre- to respectively indicate the transducer side voltage
The α phase and β phase component of measured value；All parameter upper rights
Footmark k+1 indicates corresponding parameter in the value at k+1 moment.
8. according to the method described in claim 5, it is characterized in that, described be calculated the three basic vector action time
Specifically:
The calculation formula of the three basic vector action time are as follows:
Wherein, TkIndicate the action time of k vector in three basic vectors, Tk+1Indicate k+1 in three basic vectors
The action time of vector, T0Indicate the action time of zero vector in three basic vectors, TsIndicate the work of PWM rectifier
Time cycle；The α phase and β phase component of the respectively described transducer side voltage prediction value.
9. a kind of PWM rectifier control device characterized by comprising
Parameter Calculation module, for calculating the fundametal compoment of grid side voltage, grid side electric current and transducer side voltage
With the postpones signal of the fundametal compoment；
Parameter identification module, for utilizing identification model, according to the grid side voltage, grid side electric current and converter
The postpones signal of the fundametal compoment of side voltage and the fundametal compoment, identification obtain inductance parameters, and according to the inductance parameters
Transducer side voltage prediction value is calculated；Wherein, the identification model is by by the complex vector equation of PWM rectifier
It is obtained in conjunction with the least square method of recursion for introducing forgetting factor；
Driving power module, for being obtained according to the transducer side voltage prediction value by space vector width pulse modulation method
Driving pulse for driving power pipe.
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