CN105978368A - Power inner-loop controller for PWM (Pulse Width Modulation) rectifier and control method thereof - Google Patents
Power inner-loop controller for PWM (Pulse Width Modulation) rectifier and control method thereof Download PDFInfo
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- CN105978368A CN105978368A CN201610507961.0A CN201610507961A CN105978368A CN 105978368 A CN105978368 A CN 105978368A CN 201610507961 A CN201610507961 A CN 201610507961A CN 105978368 A CN105978368 A CN 105978368A
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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
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Abstract
The invention discloses a power inner-loop controller for a PWM (Pulse Width Modulation) rectifier. The power inner-loop controller comprises a power estimation module, a power correction module, a power prediction module and an SVPWM (Space Vector Pulse Width Modulation) switching signal output module, wherein signals subjected to A/D conversion and 3s/2s transformation are connected with the power estimation module of the power inner-loop controller, the power estimation module is connected with the power correction module, the power correction module is connected with the power prediction module, the power prediction module is connected with the SVPWM switching signal output module, and the SVPWM switching signal output module is connected with a power switching device. The power inner-loop controller has the advantages that fixed switching frequency is realized using a nonlinear control method model prediction algorithm as a main control method of the controller; the controller has good dynamic and stable performance, effectively reduces the total harmonic distortion (THD) of alternating-current side current, and the unit power factor of the alternating-current side is realized; and when the given voltage of the direct-current side is suddenly changed, the direct-current side voltage has good following property.
Description
Technical field
The present invention relates to field of power electronics, ring controller and control thereof in specifically a kind of PWM rectifier power
Method.
Background technology
PWM rectifier mainly uses the control structure of outer voltage power internal ring, and traditional direct Power Control is
Hysteresis comparator and switch list being combined, comparing output comparative result by power information being sent to hysteresis comparator
Compare with the switch list pre-established, select optimal switching signal to drive power switch.This traditional control
Although system strategy inherits commutator nonlinear characteristic, but the precise degrees of switch list can affect the selection of control signal, as
Really switching signal selects improper meeting to cause power out of control, and switching frequency also can be caused not fix, and current on line side harmonic component is high, is
The problems such as system regulating time length.It is also common another kind of traditional approach that power feedforward decoupling PI controls, and this scheme is
Pi regulator and manipulator combined and improves, substantially belong to Linear Control.The shortcoming of this scheme is dynamically
In the case of, use linear control method to control nonlinear system and dynamic response can be caused slow, and this scheme is drawn again at internal ring
Having entered PI link, this is not inconsistent with the original intention of direct Power Control, and the most this improvement project still haves much room for improvement.The present invention will
Model prediction theory combines with second order Lagrange's interpolation, and active power and reactive power to the next sampling period become
Change is predicted, the tracing control of power set-point when completing to start next cycle, and uses space vector pulse width modulation
(SVPWM) produce pwm signal and drive rectifier power switch, it is achieved fixing switching frequency.This method has good dynamic
And steady-state behaviour, effectively reduce exchange and survey current total harmonic distortion (THD), it is achieved that AC unity power factor, when directly
When stream side gives voltage jump, DC voltage has good followability.
Summary of the invention
The technical problem to be solved is to provide ring controller and controlling party thereof in a kind of PWM rectifier power
Method, with nonlinear control method model prediction algorithm as the primary method of control of controller, it is achieved fixing switching frequency.
The present invention solves that above-mentioned technical problem be the technical scheme is that a kind of PWM rectifier power internal ring control
Device, the AC busbar voltage, the electric current that are gone out by sensor acquisition be connected with Signal-regulated kinase, the signal of Signal-regulated kinase
Outfan is connected with dsp controller, is sequentially provided with 3s/2s conversion module, A/D modular converter and merit in described dsp controller
Ring controller in rate, in described power ring controller include Power estimation module, power correction module, power prediction module and
SVPWM switching signal output module, by the signal of A/D conversion and 3s/2s conversion and the power budget of ring controller in power
Module connects, and Power estimation module is connected with power correction module, and power correction module is connected with power prediction module, and power is pre-
Surveying module to be connected with SVPWM switching signal output module, SVPWM switching signal output module is connected with device for power switching.
The control method of ring controller in a kind of PWM rectifier, comprises the following steps:
Step one, the conditioning of signal: the three-phase voltage from sensor acquisition, current component, through testing circuit, be filtered
Process, remove the burr signal of interference；
Step 2, from inspection circuit signal out, enter dsp controller carry out A/D conversion, carry out 3s/2s after digital quantization
Conversion, fastens to two-phase static coordinate from three phase static system transform；
Step 3, power budget: according to instantaneous power theory, estimate biphase,The idle merit of instantaneous active under rest system
Rate is, wherein, P is instantaneous active power, and q is instantaneous reactive power,、It is respectively,Quiet
The only voltage under coordinate system,、It is respectively,Electric current under rest frame；
Step 4, power correction: desired active reactive power is modified according to second order Lagrange's interpolation,, whereinFor the phase at k-th sampling period P
Prestige value,Expected value for k-th sampling period q；
Step 5, the voltage signal entrance dsp controller of dc bus testing circuit carry out A/D and are converted to DC bus-bar voltage,The command value of active power is obtained through PI controller；
Step 6, power prediction: by obtain in step 5The signal obtained with step 3 carries out power prediction, single for realizing
Position power factor, willBeing set to 0, according to the theory of model prediction algorithm, look-ahead goes out the input in SVPWM next sampling period
Signal、, it may be assumed that,
Wherein,For the sampling period,For inductance value at alternating side；
Step 7, step 5 obtainedWith step 6 obtains、Carry out SVPWM, the switch of output response
Signal controls the break-make of power switch in commutator.
Dsp controller of the present invention is DSP28335.
The invention has the beneficial effects as follows: traditional direct Power Control generally uses the hysteresis comparator belonging to Linear Control
Or PI controller, but actually whole system non-linear belongs to non-thread owing to having existed through net side inductance and DC bus capacitor
Sexual system, the present invention with nonlinear control method model prediction algorithm as the primary method of control of controller, it is achieved fixing
Switching frequency.Instantaneous active power and the change of reactive power in next sampling period is extrapolated by power prediction,
Application space Vector Pulse Width Modulation (SVPWM) technology is by being determined the selection of voltage vector and action time, thus drives
Kinetic power switchs；And by second order Lagrange differential technique, power error is modified.This with model prediction for controlling core
The P-DPC of the heart, the advantage not only inheriting tradition DPC, also overcome its shortcoming, and the power internal ring simple in construction of P-DPC, control
System is easily, it is possible to realize fixing switching frequency；There is good dynamic and steady-state behaviour, effectively reduce exchange and survey electric current
Total harmonic distortion (THD), it is achieved that AC unity power factor, when DC side gives voltage jump, DC voltage has
There is good followability.
Accompanying drawing explanation
Fig. 1 is PWM rectifier power internal ring controller system block diagram of the present invention；
Fig. 2 is that ring controller is applied to PWM rectifier control figure in power of the present invention.
Labelling in figure: 1, Power estimation module, 2, power correction module, 3, power prediction module, 4, SVPWM switching signal
Output module, 5, Signal-regulated kinase.
Detailed description of the invention
Ring controller in a kind of PWM rectifier power, AC busbar voltage, electric current and the letter gone out by sensor acquisition
Number conditioning module connects, and the signal output part of Signal-regulated kinase is connected with dsp controller, in described dsp controller successively
Being provided with ring controller in 3s/2s conversion module, A/D modular converter and power, in described power, ring controller includes that power is estimated
Calculate module 1, power correction module 2, power prediction module 3 and SVPWM switching signal output module 4, changed by A/D and 3s/
The signal of 2s conversion is connected with the Power estimation module 1 of ring controller in power, Power estimation module 1 and power correction module 2
Connecting, power correction module 2 is connected with power prediction module 3, and power prediction module 3 is with SVPWM switching signal output module 4 even
Connecing, SVPWM switching signal output module 4 is connected with device for power switching.
The control method of ring controller in a kind of PWM rectifier, comprises the following steps:
Step one, the conditioning of signal: the three-phase voltage from sensor acquisition, current component, through testing circuit, be filtered
Process, remove the burr signal of interference；
Step 2, from inspection circuit signal out, enter dsp controller carry out A/D conversion, carry out 3s/2s after digital quantization
Conversion, fastens to two-phase static coordinate from three phase static system transform；
Step 3, power budget: according to instantaneous power theory, estimate biphase,The idle merit of instantaneous active under rest system
Rate is, wherein, P is instantaneous active power, and q is instantaneous reactive power,、It is respectively,Static
Voltage under coordinate system,、It is respectively,Electric current under rest frame；
Step 4, power correction: desired active reactive power is modified according to second order Lagrange's interpolation,, whereinFor the phase at k-th sampling period P
Prestige value,Expected value for k-th sampling period q；
Step 5, the voltage signal entrance dsp controller of dc bus testing circuit carry out A/D and are converted to DC bus-bar voltage,The command value of active power is obtained through PI controller；
Step 6, power prediction: by obtain in step 5The signal obtained with step 3 carries out power prediction, for realizing unit
Power factor, willBeing set to 0, according to the theory of model prediction algorithm, look-ahead goes out the input in SVPWM next sampling period
Signal、, it may be assumed that,
Wherein,For the sampling period,For inductance value at alternating side；
Step 7, step 5 obtainedWith step 6 obtains、Carry out SVPWM, the switch of output response
Signal controls the break-make of power switch in commutator.
Dsp controller is DSP28335.
First active reactive power is modified.During model prediction direct Power Control, it is desirable to next week
The expected value of phase power is identical with actual value, but expected value and the actual value of next cycle power can be deposited in real process
In certain error, and the performance of whole system depends primarily on the accuracy of pre-power scale, so in order to reduce next week
The expected value of phase power and the error of actual value, use second order Lagrange's interpolation can play the effect reducing error.
Secondly for traditional power internal ring control method, it is impossible to realize fixing switching frequency, in order to increase switch letter
Number accuracy it is necessary to increase the accuracy of switch list or quantity, this is the biggest to the requirement of power device and DSP, and
Very sensitive to inductance parameters, once inductance value is changed, and system is by instability.A kind of PWM rectifier that the present invention proposes
Ring controller in power, achieves fixing switching frequency by application model prediction theory and second order Lagrange's interpolation,
And system is insensitive to inductance parameters, improve the robustness of system.
Active reactive power is modified being primarily directed to existing for expected value and the actual value of next cycle power
Error, to reduce their error.Model prediction algorithm decreases the regulating time of system, it is achieved that fixed switching frequency.Warp
Cross ring controller in this new power, it is possible to realize the quick tracking of power, reduce DC bus-bar voltage fluctuation, work as DC side
During given voltage jump, DC voltage has good followability.
Claims (3)
1. a ring controller in PWM rectifier power, AC busbar voltage, electric current and the signal gone out by sensor acquisition
Conditioning module connects, and the signal output part of Signal-regulated kinase is connected with dsp controller, sets successively in described dsp controller
There is ring controller in 3s/2s conversion module, A/D modular converter and power, it is characterised in that: ring controller bag in described power
Include Power estimation module (1), power correction module (2), power prediction module (3) and SVPWM switching signal output module (4),
It is connected with the Power estimation module (1) of ring controller in power by the signal of A/D conversion and 3s/2s conversion, power budget mould
Block (1) is connected with power correction module (2), and power correction module (2) is connected with power prediction module (3), power prediction module
(3) being connected with SVPWM switching signal output module (4), SVPWM switching signal output module (4) is connected with device for power switching.
The control method of ring controller in a kind of PWM rectifier the most according to claim 1, it is characterised in that: include with
Lower step:
Step one, the conditioning of signal: the three-phase voltage from sensor acquisition, current component, through testing circuit, be filtered
Process, remove the burr signal of interference；
Step 2, from inspection circuit signal out, enter dsp controller carry out A/D conversion, carry out 3s/2s after digital quantization
Conversion, fastens to two-phase static coordinate from three phase static system transform；
Step 3, power budget: according to instantaneous power theory, estimate biphase,The idle merit of instantaneous active under rest system
Rate is, wherein, P is instantaneous active power, and q is instantaneous reactive power,、It is respectively,Static
Voltage under coordinate system,、It is respectively,Electric current under rest frame；
Step 4, power correction: desired active reactive power is modified according to second order Lagrange's interpolation,, whereinFor the phase at k-th sampling period P
Prestige value,Expected value for k-th sampling period q；
Step 5, the voltage signal entrance dsp controller of dc bus testing circuit carry out A/D and are converted to DC bus-bar voltage,The command value of active power is obtained through PI controller；
Step 6, power prediction: by obtain in step 5The signal obtained with step 3 carries out power prediction, for realizing unit
Power factor, willBeing set to 0, according to the theory of model prediction algorithm, look-ahead goes out the input in SVPWM next sampling period
Signal、, it may be assumed that,
Wherein,For the sampling period,For inductance value at alternating side；
Step 7, step 5 obtainedWith step 6 obtains、Carry out SVPWM, the switch letter of output response
Number control the break-make of power switch in commutator.
The control method of ring controller in a kind of PWM rectifier the most according to claim 1 and 2, it is characterised in that: described
Dsp controller is DSP28335.
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Cited By (3)
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| CN107317490A (en) * | 2017-07-03 | 2017-11-03 | 三峡大学 | A kind of dead beat prediction direct Power Control method based on three-phase Vienna rectifiers |
| CN108196217A (en) * | 2017-12-22 | 2018-06-22 | 中国电力科学研究院有限公司 | A kind of DC measurement method and system for showing school instrument for off-board charger |
| CN108667037A (en) * | 2018-04-25 | 2018-10-16 | 安徽工程大学 | STATCOM/BESS micro-capacitance sensors cooperative control method based on P-DPC and its system |
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Application publication date: 20160928 |