CN105591530A - Three-phase PWM rectification control method on the basis of model prediction and triangular wave comparison - Google Patents
Three-phase PWM rectification control method on the basis of model prediction and triangular wave comparison Download PDFInfo
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- CN105591530A CN105591530A CN201510737259.9A CN201510737259A CN105591530A CN 105591530 A CN105591530 A CN 105591530A CN 201510737259 A CN201510737259 A CN 201510737259A CN 105591530 A CN105591530 A CN 105591530A
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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
- H02M1/00—Details of apparatus for conversion
- H02M1/12—Arrangements for reducing harmonics from ac input or output
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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
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Abstract
The present invention discloses a three-phase PWM rectification control method on the basis of model prediction and triangular wave comparison, belonging to the fields of power electronics converting technology and intelligent control. The control method mainly comprises a voltage outer ring, model prediction control and triangular wave comparison control. The voltage outer ring is a PI link, and the model prediction control is current inner ring control. The three-phase PWM rectification control method on the basis of model prediction and triangular wave comparison is simple, and is able to realize specific frequency control with input power factor of 1 and input current low harmonic at the alternating current side through each advantages of triangular wave comparison control and model prediction control when the switching frequency is low.
Description
Technical field
The present invention relates to three-phase voltage type PWM commutation technique, relate in particular to the three-phase PWM rectification control method based on model prediction and triangle wave.
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 larger to electric network influencing, and current-responsive cannot meet productive life demand slowly; And Three-phase PWM Voltage Rectifier can be eliminated Harmonics of Input from root, and there is unity power factor, so be subject to paying close attention to of current power electronic applications.
Common control strategy has at present: the control of stagnant chain rate, Model Predictive Control, current forecasting control, and feed forward decoupling control, but these controls still have weak point at present: simple stagnant chain rate is still larger compared with control inputs current ripples; And feed forward decoupling control, current forecasting control need to increase SVPWM or SPWM link, algorithm complexity; Model Predictive Control is divided into continuous Model Predictive Control and finite aggregate Model Predictive Control, although finite aggregate Model Predictive Control dynamic response contrast is fast, but can not realize fixed-frequency control, cause AC filtering difficulty, and continuous Model Predictive Control need modulator conventionally.
Summary of the invention
For the deficiency of existing control strategy, the object of the invention is to provide the control method of the three-phase PWM rectification based on model prediction and triangle wave. Utilize triangle wave control and model prediction advantage separately, design new type of control method, when shortcut calculation, reduces ac-side current harmonic wave, realizes fixed-frequency control simultaneously.
Object of the present invention can be achieved through the following technical solutions.
Three-phase PWM rectification control method based on model prediction and triangle wave, key step is as follows:
(S1) utilize phase lock circuitry to obtain the zero crossing of electrical network A phase voltage (ea), DSP calculates the electrical network 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 data signal simultaneously;
(S2) utilize the current Hall sensor input current value (ia, ib, ic) of sampling three-phase reactor respectively, 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 data signal;
(S3) completing steps (S1) and (S2) after, input using 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*) multiplies each other and obtains reference current i* α and i* β with electric network voltage phase information;
(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 reference current that control obtains according to outer voltage, three-phase alternating current side electric current, three-phase alternating current side voltage carry out Model Predictive Control;
(S5) obtain rectifier bridge AC two phase voltages (V α, V β) in two-phase α β rest frame according to Model Predictive Control, and transform to three-phase abc rest frame and obtain three-phase voltage (Va, Vb, Vc), then the three-phase voltage that conversion is obtained regulates and amplitude limit through PI divided by DC voltage reference value (Vdc_ref) respectively, output compares with triangular wave, finally exports 6 roads and drives signal; Wherein the amplitude of triangular wave is consistent with PI amplitude limit.
Further, in described step (S1), utilize phase lock circuitry to obtain zero crossing time of electrical network A phase voltage (ea), in the cycle of calculating in real time electrical network with DSP, calculate the value of electrical network input three-phase voltage simultaneously.
Further, in described step (S2), the middle current Hall sensor input current value (ia, ib, ic) of sampling three-phase reactor respectively, the output dc voltage value (Vdc) at employing electric resistance partial pressure method sampling three-phase voltage type PWM rectifier DC bus capacitor (C) two ends utilized.
Further, in described step (S3), instruction DC voltage value (Vdc_ref) and the difference of output dc voltage value (Vdc) are carried out to PI control, PI controls and exports the amplitude (I*) that obtains reference current, reference current amplitude (I*) and cos (wt) multiply each other and obtain reference current i* α, and reference current amplitude (I*) and sin (wt) multiply each other and obtain reference current i* β.
Further, described step (S4) and (S5) in, under two-phase α β rest frame, carry out Model Predictive Control according to the data of (S1), (S2), (S3) step, Model Predictive Control of the present invention refers to the Model Predictive Control of continuous state, in step (S5) by the output of model prediction and triangle wave control, thereby obtain three-phase driving signal.
Compared with prior art, the invention has the beneficial effects as follows:
1, algorithm is simple, without SVPWM or SPWM modulating unit;
2, Three-phase PWM Voltage Rectifier AC input current ripple is low, and system can realize unity power factor operation;
3, Three-phase PWM Voltage Rectifier DC side output voltage is controlled, and ripple is little;
4, can realize fixed-frequency control.
Brief description of the drawings
Fig. 1 is the three-phase PWM rectification control method block diagram based on model prediction and triangle wave of the present invention;
Fig. 2 is the design sketch of application Three-phase PWM Voltage Rectifier matlab emulation DC side output voltage of the present invention;
Fig. 3 is the design sketch of application Three-phase PWM Voltage Rectifier matlab emulation A cross streams side input voltage of the present invention and electric current.
Detailed description of the invention
Below in conjunction with the present invention is described in further detail the explanation of embodiment and accompanying drawing, but embodiments of the present invention are not limited to this. Be pointed out that, if below have not process or the parameter of special detailed description, be all that those skilled in the art can be with reference to existing techniques in realizing.
As shown in Figure 1, the three-phase PWM rectification control method schematic diagram based on model prediction and triangle wave of the present invention, key step is as follows:
(S1) utilize phase lock circuitry to obtain the zero crossing of electrical network A phase voltage (ea), DSP calculates the electrical network 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 data signal simultaneously;
(S2) utilize the current Hall sensor input current value (ia, ib, ic) of sampling three-phase reactor respectively, adopt the DC voltage value (Vdc) at electric resistance partial pressure method sampling three-phase voltage type PWM rectifier DC bus capacitor (C) two ends, and be converted to data signal;
(S3) completing steps (S1) and (S2) after, instruction DC voltage value (Vdc_ref) and the difference of output dc voltage value (Vdc) are carried out to PI control, PI controls and exports the amplitude (I*) that obtains reference current, reference current amplitude (I*) and cos (wt) multiply each other and obtain reference current i* α, and reference current amplitude (I*) and sin (wt) multiply each other and obtain reference current 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 reference current that control obtains according to outer voltage, three-phase alternating current side electric current, three-phase alternating current side voltage carry out Model Predictive Control, described in being specifically implemented as follows:
A) suppose that AC reactance is L, circuit and reactance equivalent resistance are R, and ABC triphase parameter is all equal, and the lower switch function of two-phase rest frame (α coordinate system) is defined as S α and S β, and the cycle in systematic sampling of establishing is Ts. Obtain ac-side current relation suc as formula (1) according to Kirchhoff's second law:
Wherein iαAnd iβFor the input current value (ia, ib, ic) of three-phase reactor transforms to the value of two-phase α β rest frame; eαAnd eβFor the magnitude of voltage (ea, eb, ec) of electrical network three-phase input 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; Other parameters as previously mentioned.
Formula (1) discretization is obtained to the current expression (2) of k+1 sampling instant:
Wherein iαAnd i (k)β(k) be the input current measured value of three-phase reactor under k sampling instant two-phase α β rest frame; iαAnd 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, objective definition function is as (3):
J＝(iα(k+1)-iα *)2+(iβ(k+1)-iβ *)2(3)
C) when object function J hour, current tracking effect is best, tries to achieve partial differentialWithAnd make it equal zero:
Wherein Vα＝Sα*Vdc，Vβ＝Sβ*Vdc，VαAnd VβFor rectifier bridge AC voltage under two-phase α β rest frame.
Through type (4) obtains rectifier bridge AC voltage V α and V β is (5):
(S5) obtain rectifier bridge AC voltage V α and V β according to Model Predictive Control, and be transformed under three-phase abc rest frame and obtain Va, Vb, Vc, then Va, Vb, Vc are regulated and amplitude limit through PI divided by DC voltage reference value Vdc_ref respectively, output compares with triangular wave (amplitude and PI amplitude limit are consistent), finally exports 6 roads and drives signal.
In step (S2), described output dc voltage (Vdc) sampling adopts electric resistance partial pressure, and utilizes HCPL-7840 isolation, then conditioning makes sampled voltage adapt to the voltage range of DSP sample port through amplifier.
As preferably, can select the dsp processor of Texas Instruments's 2000 series 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 to PI control, PI controls and exports the amplitude (I*) that obtains reference current, reference current amplitude (I*) and cos (wt) multiply each other and obtain reference current i* α, and reference current amplitude (I*) and sin (wt) multiply each other and obtain reference current i* β;
In step (S5), be that the output of model prediction is carried out to triangle wave control, without modulator, switching frequency is identical with triangular wave frequency, can carry out by-pass cock frequency by adjusting triangle ripple frequency and realize fixed frequency, thereby obtain three-phase driving signal. Wherein, in the time of triangle wave control, when input value is greater than triangular wave, the driving signal of the upper brachium pontis of corresponding half-bridge is 1, and the driving signal of lower brachium pontis is 0; In the time that input value is less than triangular wave, the upper brachium pontis of corresponding half-bridge is 0, and the driving signal of lower brachium pontis is 1.
As shown in Figure 2 to 3, adopt VD (Vdc) response of Three-phase PWM Voltage Rectifier matlab emulation of the present invention fast, ripple is little, alternating current net side voltage A phase voltage (ea) and A cross streams electric current (ia) same-phase, input power factor is high, is approximately 1.
Those skilled in the art can make various amendments 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. the three-phase PWM rectification control method based on model prediction and triangle wave, is characterized in that comprising the steps:
(S1) utilize phase lock circuitry to obtain the zero crossing of electrical network A phase voltage (ea), DSP calculates the electrical network 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 data signal simultaneously;
(S2) utilize the current Hall sensor input current value (ia, ib, ic) of sampling three-phase reactor respectively, 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 data signal;
(S3) completing steps (S1) and (S2) after, input using 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*) multiplies each other and obtains reference current i* α and i* β with electric network voltage phase information;
(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 reference current that control obtains according to outer voltage, three-phase alternating current side electric current, three-phase alternating current side voltage carry out Model Predictive Control;
(S5) obtain rectifier bridge AC two phase voltages (V α, V β) in two-phase α β rest frame according to Model Predictive Control, and transform to three-phase abc rest frame and obtain three-phase voltage (Va, Vb, Vc), then the three-phase voltage that conversion is obtained regulates and amplitude limit through PI divided by DC voltage reference value (Vdc_ref) respectively, output compares with triangular wave, finally exports 6 roads and drives signal; Wherein the amplitude of triangular wave is consistent with PI amplitude limit.
2. the three-phase PWM rectification control method based on model prediction and triangle wave according to claim 1, it is characterized in that: in step (S1), utilize phase lock circuitry to obtain the zero crossing time of electrical network A phase voltage (ea), calculate in real time the cycle of electrical network with DSP, calculate the value of electrical network input three-phase voltage simultaneously, in step (S2), utilize the current Hall sensor input current value (ia of sampling three-phase reactor respectively, 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 three-phase PWM rectification control method based on model prediction and triangle wave 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 to PI control, PI controls and exports the amplitude (I*) that obtains reference current, reference current amplitude (I*) and cos(wt) multiply each other and obtain reference current i* α, reference current amplitude (I*) and sin(wt) multiply each other and obtain reference current i* β.
4. the three-phase PWM rectification control method based on model prediction and triangle wave according to claim 1, it is characterized in that: in step (S4), under two-phase α β rest frame, carry out Model Predictive Control according to the data of (S1), (S2), (S3) step, described Model Predictive Control refers to the Model Predictive Control of continuous state.
5. the three-phase PWM rectification control method based on model prediction and triangle wave according to claim 1, it is characterized in that: in step (S5), the output of model prediction is without SPWM or SVPWM modulating unit, directly and triangle wave, switching frequency realization identical with triangular wave frequency surely frequently, directly exported three-phase driving signal after triangle wave.
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| CN106385196A (en) * | 2016-09-27 | 2017-02-08 | 华中科技大学 | Current ripple real-time prediction model-based three-level voltage source variable switching frequency control method |
| CN107204711A (en) * | 2017-07-04 | 2017-09-26 | 北京千驷驭电气有限公司 | Current prediction method and device based on extension z-transform |
| CN107370402A (en) * | 2017-08-31 | 2017-11-21 | 华南理工大学 | A kind of method for handover control based on discrete-time Lyapunov function |
| CN107370403A (en) * | 2017-08-31 | 2017-11-21 | 华南理工大学 | Power electronic system finite aggregate model predictive control method based on discrete-time Lyapunov function |
| CN107395035A (en) * | 2017-08-31 | 2017-11-24 | 华南理工大学 | A kind of modulator approach of the Single-phase PWM Rectifier based on discrete-time Lyapunov function |
| CN107453627A (en) * | 2017-08-31 | 2017-12-08 | 华南理工大学 | A kind of fixed-frequency control method of finite aggregate Model Predictive Control |
| CN107528447A (en) * | 2017-07-26 | 2017-12-29 | 华南理工大学 | A kind of switch type forecast Control Algorithm |
| CN111211701A (en) * | 2020-02-13 | 2020-05-29 | 厦门大学 | Few-sensor model prediction control method of three-phase voltage source type rectifier |
| CN117134586A (en) * | 2023-10-26 | 2023-11-28 | 茂睿芯（深圳）科技有限公司 | Multi-mode working power factor correction control system |
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| CN106385196A (en) * | 2016-09-27 | 2017-02-08 | 华中科技大学 | Current ripple real-time prediction model-based three-level voltage source variable switching frequency control method |
| CN107204711A (en) * | 2017-07-04 | 2017-09-26 | 北京千驷驭电气有限公司 | Current prediction method and device based on extension z-transform |
| CN107528447A (en) * | 2017-07-26 | 2017-12-29 | 华南理工大学 | A kind of switch type forecast Control Algorithm |
| CN107370402A (en) * | 2017-08-31 | 2017-11-21 | 华南理工大学 | A kind of method for handover control based on discrete-time Lyapunov function |
| CN107370403A (en) * | 2017-08-31 | 2017-11-21 | 华南理工大学 | Power electronic system finite aggregate model predictive control method based on discrete-time Lyapunov function |
| CN107395035A (en) * | 2017-08-31 | 2017-11-24 | 华南理工大学 | A kind of modulator approach of the Single-phase PWM Rectifier based on discrete-time Lyapunov function |
| CN107453627A (en) * | 2017-08-31 | 2017-12-08 | 华南理工大学 | A kind of fixed-frequency control method of finite aggregate Model Predictive Control |
| CN107453627B (en) * | 2017-08-31 | 2020-07-28 | 华南理工大学 | Fixed frequency control method for prediction control of finite set model |
| CN111211701A (en) * | 2020-02-13 | 2020-05-29 | 厦门大学 | Few-sensor model prediction control method of three-phase voltage source type rectifier |
| CN111211701B (en) * | 2020-02-13 | 2021-08-13 | 厦门大学 | Few-sensor model prediction control method of three-phase voltage source type rectifier |
| CN117134586A (en) * | 2023-10-26 | 2023-11-28 | 茂睿芯（深圳）科技有限公司 | Multi-mode working power factor correction control system |
| CN117134586B (en) * | 2023-10-26 | 2024-02-09 | 茂睿芯（深圳）科技有限公司 | Multi-mode working power factor correction control system |
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