CN105356772A - Three-phase PWM rectification control method based on improved model predictive control - Google Patents

Three-phase PWM rectification control method based on improved model predictive control Download PDF

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CN105356772A
CN105356772A CN201510737662.1A CN201510737662A CN105356772A CN 105356772 A CN105356772 A CN 105356772A CN 201510737662 A CN201510737662 A CN 201510737662A CN 105356772 A CN105356772 A CN 105356772A
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phase
voltage
model predictive
control
current
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杜贵平
柳志飞
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South China University of Technology SCUT
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South China University of Technology SCUT
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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
    • H02M7/2173—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 biphase or polyphase circuit arrangement
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/12—Arrangements for reducing harmonics from ac input or output
    • 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
    • H02M1/00—Details of apparatus for conversion
    • H02M1/42—Circuits or arrangements for compensating for or adjusting power factor in converters or inverters
    • H02M1/4208—Arrangements for improving power factor of AC input
    • H02M1/4216—Arrangements for improving power factor of AC input operating from a three-phase input voltage
    • 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
    • Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
    • Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes

Abstract

The invention discloses a three-phase PWM rectification control method based on improved model predictive control, which belongs to the field of power and electronic converting techniques and intelligent control. The three-phase PWM rectification control method mainly comprises a voltage outer loop and model predictive control, wherein the voltage outer loop is a PI link, and the model predictive control is current inner loop control. The three-phase PWM rectification control method improves the setting of objective functions on the basis of traditional finite set model predictive control, and adds the optimal objective function value at the last sampling moment into an objective function at the current sampling moment, so that the objective function values of the adjacent sampling moments are correlated and have feedback characteristics. The three-phase PWM rectification control method based on improved model predictive control disclosed by the invention reserves advantages of the traditional finite set model predictive control, is lower in current harmonics at an AC side, and has better control effect.

Description

Based on the control method of the three-phase PWM rectification of improved model PREDICTIVE CONTROL
Technical field
The present invention relates to three-phase voltage type PWM commutation technique field, particularly relate to the control method of the three-phase PWM rectification based on improved model PREDICTIVE CONTROL.
Background technology
Along with expanding economy, the demand of high-power DC power supply rises year by year, and traditional not controlling with phased large power supply Harmonics of Input is large, and power factor is low comparatively large to electric network influencing, and current response cannot meet productive life demand slowly; And Three-phase PWM Voltage Rectifier can eliminate Harmonics of Input from root, and there is unity power factor, so be subject to paying close attention to of current power electronic applications.
Control strategy common at present has: hysteresis comparison control, Model Predictive Control, predictive current control, feed forward decoupling control, but these controls still have weak point at present: simple hysteresis comparison control input current ripple is still larger; And feed forward decoupling control, predictive current control need to increase SVPWM or SPWM link, algorithm is complicated; Although conventional finite collection Model Predictive Control dynamic response contrast is fast, ac-side current harmonic wave is relative to Traditional control or bigger than normal.
Summary of the invention
For the deficiency of existing control strategy, the object of the invention is the control method of the three-phase PWM rectification provided based on improved model PREDICTIVE CONTROL.The setting of the method Further aim function on the basis of conventional finite collection Model Predictive Control, the optimal objective function value of a upper sampling instant is joined in the target function of current sample time, make that the target function value in neighbouring sample moment is interrelated has feedback characteristics, ac-side current harmonic wave significantly declines, and control effects is better.
Object of the present invention can be achieved through the following technical solutions: based on the control method of the three-phase PWM rectification of improved model PREDICTIVE CONTROL, key step is as follows:
(S1) phase lock circuitry is utilized to obtain the zero crossing of electrical network A phase voltage (ea), DSP calculates grid cycle in real time according to the zero crossing of electrical network A phase voltage (ea), and change control cycle with this, calculate the magnitude of voltage (ea, eb, ec) of electrical network three-phase input according to the zero crossing of electrical network A phase voltage (ea), and dress is changed to digital signal simultaneously;
(S2) input current value (ia, ib, ic) of current Hall transducer difference sampling three-phase reactor is utilized, adopt the output dc voltage value (Vdc) at point platen press sampling three-phase voltage type PWM rectifier DC bus capacitor (C) two ends, and be converted to digital signal;
(S3) after completing steps (S1) and (S2), using the input of the difference of instruction DC voltage value (Vdc_ref) and output dc voltage value (Vdc) as outer voltage, outer voltage adopts PI to control, the output that PI controls obtains the amplitude (I*) of reference current, and reference current amplitude (I*) is multiplied with electric network voltage phase information and obtains reference current i* α and i* β;
(S4) Mathematical Modeling of Three-phase PWM Voltage Rectifier is transformed to two-phase α β rest frame from three-phase abc rest frame, and the optimal objective function value J (k-1) of the reference current controlling to obtain according to outer voltage, three-phase alternating current side electric current, three-phase alternating current side voltage, a upper sampling instant optcarry out finite aggregate Model Predictive Control, the definition k moment is current sample time, and k-1 is a upper sampling instant;
(S5) threephase switch signal Sa (k), Sb (k), Sc (k) act on switching tube is directly exported according to finite aggregate model PREDICTIVE CONTROL.
In described step (S1), utilize phase lock circuitry to obtain the zero crossing time of electrical network A phase voltage (ea), calculate the cycle of electrical network with DSP in real time, calculate the value of electrical network input three-phase voltage simultaneously.
In described step (S2), utilize the input current value (ia, ib, ic) of current Hall transducer difference sampling three-phase reactor, adopt the output dc voltage value (Vdc) at electric resistance partial pressure method sampling three-phase voltage type PWM rectifier DC bus capacitor (C) two ends.
In described step (S3), instruction DC voltage value (Vdc_ref) and the difference of output dc voltage value (Vdc) are carried out PI control, PI controls to export the amplitude (I*) obtaining reference current, reference current amplitude (I*) is multiplied with cos (wt) and obtains reference current i* α, and reference current amplitude (I*) is multiplied with sin (wt) and obtains reference current i* β.
In described step (S4), data according to (S1), (S2), (S3) step carry out finite aggregate Model Predictive Control (FiniteControlSetModelPredictiveControl under two-phase α β rest frame, FCS-MPC), in the definition of target function by the optimal objective function value J (k-1) of a upper sampling instant optjoin in the target function of current sample time and make that the target function value in neighbouring sample moment is interrelated has feedback characteristics.
In described step (S5), finite aggregate Model Predictive Control directly exports threephase switch signal Sa (k), Sb (k), Sc (k) act on switching tube without the need to modulator.
Compared with prior art, the invention has the beneficial effects as follows:
1, without the need to SVPWM unit or SPWM unit;
2, Three-phase PWM Voltage Rectifier AC Harmonics of Input is low, and system can realize unity power factor and run;
3, Three-phase PWM Voltage Rectifier DC side output voltage is controlled, and ripple is little;
4, all advantages of conventional finite collection Model Predictive Control are retained.
Accompanying drawing explanation
Fig. 1 is the control method control block diagram of the three-phase PWM rectification based on improved model PREDICTIVE CONTROL of the present invention;
Fig. 2 is the control method algorithm flow chart of the three-phase PWM rectification based on improved model PREDICTIVE CONTROL of the present invention;
Fig. 3 a ~ 3b is the design sketch of the matlab emulation DC side output voltage of application conventional finite collection Model Predictive Control and Three-phase PWM Voltage Rectifier of the present invention respectively.
Fig. 4 a ~ 4b is the design sketch of the matlab emulation A cross streams side input voltage and input current of application conventional finite collection Model Predictive Control and Three-phase PWM Voltage Rectifier of the present invention respectively.
Fig. 5 a ~ 5b is the harmonic analysis figure of the matlab emulation A cross streams side input current of application conventional finite collection Model Predictive Control and Three-phase PWM Voltage Rectifier of the present invention respectively.
Embodiment
Below in conjunction with embodiment and accompanying drawing, the present invention is described in further detail illustrates, but embodiments of the present invention are not limited thereto.If have process or the parameter of not special detailed description it is noted that following, be all that those skilled in the art can refer to existing techniques in realizing.
As shown in Fig. 1 ~ Fig. 2, the control method control block diagram of the three-phase PWM rectification based on improved model PREDICTIVE CONTROL of the present invention and algorithm flow chart, key step is as follows:
(S1) phase lock circuitry is utilized to obtain the zero crossing of electrical network A phase voltage (ea), DSP calculates grid cycle in real time according to the zero crossing of electrical network A phase voltage (ea), and change control cycle with this, calculate the magnitude of voltage (ea, eb, ec) of electrical network three-phase input according to the zero crossing of electrical network A phase voltage (ea) simultaneously
And dress is changed to digital signal;
(S2) input current value (ia, ib, ic) of current Hall transducer difference sampling three-phase reactor is utilized, adopt the output dc voltage value (Vdc) at point platen press sampling three-phase voltage type PWM rectifier DC bus capacitor (C) two ends, and be converted to digital signal;
(S3) after completing steps (S1) and (S2), using the input of the difference of instruction DC voltage value (Vdc_ref) and output dc voltage value (Vdc) as outer voltage, outer voltage adopts PI to control, the output that PI controls obtains the amplitude (I*) of reference current, and reference current amplitude (I*) is multiplied with electric network voltage phase information and obtains reference current i* α and i* β;
(S4) under two-phase α β rest frame, finite aggregate Model Predictive Control (FiniteControlSetModelPredictiveControl is carried out according to the data of (S1), (S2), (S3) step, FCS-MPC), in the definition of target function by the optimal objective function value J (k-1) of a upper sampling instant optjoin in the target function of current sample time and make that the target function value in neighbouring sample moment is interrelated has feedback characteristics, be specifically implemented as follows:
A) suppose that AC reactance is L, the lower resistance such as circuit and reactance is R, and ABC triphase parameter is all equal, and system sampling frequency is Ts.Under three-phase abc rest frame, switch function S is defined as S=SaSbSc, Si (i=a, b, c)=1, Si (i=a, b, c)=0 during lower brachium pontis conducting when often going up brachium pontis conducting mutually; We can obtain switch function S and have 8 kinds, S=[000; 001; 011; 010; 110; 100; 101; 111]; Suppose that current sample time is the k moment in addition, a upper sampling instant is the k-1 moment.
B) Mathematical Modeling of Three-phase PWM Voltage Rectifier is transformed to two α β phase rest frames from three-phase abc rest frame, obtains ac-side current relation such as formula (1) according to Kirchhoff's second law:
L di α d t = - Ri α - S α V d c + e α L di β d t = - Ri β - S β V d c + e β - - - ( 1 )
Wherein i αand i βinput current value (ia, ib, ic) for three-phase reactor transforms to the value of two-phase α β rest frame; e αand e βmagnitude of voltage (ea, eb, ec) for the input of electrical network three-phase transforms to the value of two-phase α β rest frame; Vdc is the DC voltage value at Three-phase PWM Voltage Rectifier DC bus capacitor (C) two ends; S αand S βfor switch function S-transformation under three-phase abc rest frame is to the value of two-phase α β rest frame; Other parameters as previously mentioned.
Formula (1) discretization is obtained the current expression (2) of k+1 sampling instant:
i α ( k + 1 ) = ( 1 - RT s L ) i α ( k ) + T s L ( e α - S α V d c ) i β ( k + 1 ) = ( 1 - R 5 T s L ) i β ( k ) + T s L ( e β - S β V d c ) - - - ( 2 )
Wherein i α(k) and i βk () is the input current measured value of three-phase reactor under k sampling instant two-phase α β rest frame; i αand i (k+1) β(k+1) be the predicted current value of three-phase reactor under k+1 sampling instant two-phase α β rest frame.
B) for making k+1 moment predicted current good track reference current i * α and i* β, in order to make, the target function value in neighbouring sample moment is interrelated has feedback characteristics in addition, by the optimal objective function value J (k-1) of a upper sampling instant optjoin in target function, target function J is defined as follows formula (3):
J 1 = [ i α ( k + 1 ) - i α * ] 2 + [ i β ( k + 1 ) - i β * ] 2 J = λ | J 1 - J ( k - 1 ) o p t | (λ is control coefrficient, and suggestion gets 0.4) (3)
C) the switching function value S of k sampling instant is utilized i(k) (i=1,2,8) and outer voltage control export current reference value, three-phase alternating current side electric current, with the electric current in formula (2) prediction k+1 moment under two-phase α β rest frame, bring 8 electric currents of prediction into target function J to compare, find out switch function S (k) making target function J minimum, and preservation there is target function value J (k) most opt.
(S5) optimum switching function S (k) is obtained according to finite aggregate Model Predictive Control, direct output switching signal Sa (k), Sb (k), Sc (k) action switch pipe.
In step (S2), described output dc voltage (Vdc) sampling adopts electric resistance partial pressure, and utilizes HCPL-7840 to isolate, then makes sampled voltage adapt to the voltage range of DSP sample port through amplifier conditioning.
As preferably, the dsp processor of Texas Instruments 2000 series can be selected to carry out algorithm calculating.
In step (S3), instruction DC voltage value (Vdc_ref) and the difference of output dc voltage value (Vdc) are carried out PI control, PI controls to export the amplitude (I*) obtaining reference current, reference current amplitude (I*) is multiplied with cos (wt) and obtains reference current i* α, and reference current amplitude (I*) is multiplied with sin (wt) and obtains reference current i* β.
In step (S4), control coefrficient λ can be gathered by emulation or ripe examination and choose, and advises that preferential value is 0.4.
As shown in Fig. 3 a ~ 3b, the ripple that the matlab of Three-phase PWM Voltage Rectifier of application the present invention and conventional finite collection Model Predictive Control emulate the DC side output voltage obtained is all very little, and response is soon, all very stable.
As shown in Fig. 4 a ~ 4b, the matlab of the Three-phase PWM Voltage Rectifier of application the present invention and conventional finite collection Model Predictive Control emulates the alternating current net side A phase voltage ea alternating current ia same-phase obtained, all input power factor can be realized high, be approximately 1, but it is less to apply simulation result of the present invention display ac-side current ripple.
As shown in Fig. 5 a ~ 5b, the matlab of Three-phase PWM Voltage Rectifier of application the present invention and conventional finite collection Model Predictive Control emulates the A obtained, and to intersect drift net top-cross stream side current harmonics all very little, but it is less to apply simulation result of the present invention display ac-side current harmonic wave, and control effects is better.
Those skilled in the art can make various amendment to this specific embodiment or supplement or adopt similar mode to substitute under the prerequisite without prejudice to principle of the present invention and essence, but these changes all fall into protection scope of the present invention.Therefore the technology of the present invention scope is not limited to above-described embodiment.

Claims (5)

1., based on the control method of the three-phase PWM rectification of improved model PREDICTIVE CONTROL, it is characterized in that comprising the steps:
(S1) phase lock circuitry is utilized to obtain the zero crossing of electrical network A phase voltage (ea), DSP calculates grid cycle in real time according to the zero crossing of electrical network A phase voltage (ea), and change control cycle with this, calculate the magnitude of voltage (ea, eb, ec) of electrical network three-phase input according to the zero crossing of electrical network A phase voltage (ea), and dress is changed to digital signal simultaneously;
(S2) input current value (ia, ib, ic) of current Hall transducer difference sampling three-phase reactor is utilized, adopt the output dc voltage value (Vdc) at point platen press sampling three-phase voltage type PWM rectifier DC bus capacitor (C) two ends, and be converted to digital signal;
(S3) after completing steps (S1) and (S2), using the input of the difference of instruction DC voltage value (Vdc_ref) and output dc voltage value (Vdc) as outer voltage, outer voltage adopts PI to control, the output that PI controls obtains the amplitude (I*) of reference current, and reference current amplitude (I*) is multiplied with electric network voltage phase information and obtains reference current i* α and i* β;
(S4) Mathematical Modeling of Three-phase PWM Voltage Rectifier is transformed to two-phase α β rest frame from three-phase abc rest frame, and the optimal objective function value J (k-1) of the reference current controlling to obtain according to outer voltage, three-phase alternating current side electric current, three-phase alternating current side voltage, a upper sampling instant optcarry out finite aggregate Model Predictive Control, the definition k moment is current sample time, and k-1 is a upper sampling instant;
(S5) threephase switch signal Sa (k), Sb (k), Sc (k) act on switching tube is directly exported according to finite aggregate model PREDICTIVE CONTROL.
2. the control method of the three-phase PWM rectification based on improved model PREDICTIVE CONTROL according to claim 1, it is characterized in that: in step (S1), phase lock circuitry is utilized to obtain the zero crossing time of electrical network A phase voltage (ea), the cycle of electrical network is calculated in real time with DSP, calculate the value of electrical network input three-phase voltage simultaneously, input current value (the ia of current Hall transducer difference sampling three-phase reactor is utilized in step (S2), ib, ic), adopt the output dc voltage value (Vdc) at electric resistance partial pressure method sampling three-phase voltage type PWM rectifier DC bus capacitor (C) two ends.
3. the control method of the three-phase PWM rectification based on improved model PREDICTIVE CONTROL according to claim 1, it is characterized in that: in step (S3), instruction DC voltage value (Vdc_ref) and the difference of output dc voltage value (Vdc) are carried out PI control, PI controls to export the amplitude (I*) obtaining reference current, reference current amplitude (I*) and cos(wt) being multiplied obtains reference current i* α, reference current amplitude (I*) and sin(wt) being multiplied obtains reference current i* β.
4. the three-phase PWM rectify control method based on model prediction and triangle wave according to claim 1, it is characterized in that: in step (S4), data according to (S1), (S2), (S3) step carry out finite aggregate Model Predictive Control under two-phase α β rest frame, by the optimal objective function value J (k-1) of a upper sampling instant in the definition of target function optjoin in the target function of current sample time and make that the target function value in neighbouring sample moment is interrelated has feedback characteristics.
5. the three-phase PWM rectify control method based on model prediction and triangle wave according to claim 1, it is characterized in that: in step (S5), finite aggregate Model Predictive Control directly exports threephase switch signal Sa (k), Sb (k), Sc (k) act on switching tube without the need to modulator.
CN201510737662.1A 2015-11-01 2015-11-01 Three-phase PWM rectification control method based on improved model predictive control Pending CN105356772A (en)

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CN107546998A (en) * 2017-07-25 2018-01-05 华南理工大学 A kind of switch type control method based on bicyclic PREDICTIVE CONTROL
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CN112600452B (en) * 2020-12-09 2022-07-05 中国电建集团华东勘测设计研究院有限公司 MMC finite set model prediction control method and system based on bridge arm current control

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Application publication date: 20160224