CN108039812A - The electronic power convertor power factor lead-lag control strategy of one circle control - Google Patents
The electronic power convertor power factor lead-lag control strategy of one circle control Download PDFInfo
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- CN108039812A CN108039812A CN201711366316.2A CN201711366316A CN108039812A CN 108039812 A CN108039812 A CN 108039812A CN 201711366316 A CN201711366316 A CN 201711366316A CN 108039812 A CN108039812 A CN 108039812A
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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
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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
- H02M1/0003—Details of control, feedback or regulation circuits
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Abstract
The present invention provides a kind of electronic power convertor power factor lead-lag control strategy of one circle control.Specifically include following steps：The relevant parameter of electronic power convertor input and output is determined first；Then required to carry out associated control parameters calculating according to phase shift；Ratio phase shift link is finally introduced in current feedback loop according to control parameter, and by the output Signal averaging into primary current backfeed loop.The present invention, by increasing ratio phase shift link in current feedback, makes system, by controlling the phase of electric current, produce required perception or capacitive reactive power while real power control requirement is met according to monocycle Direct Current Control feature.The present invention realizes that simply strong robustness, a kind of effective power-factor angle lead-lag control method is provided for one circle control without extra voltage sensor, wave filter and phaselocked loop at the same time.
Description
Technical field
The present invention relates to the electronic power convertor work(of power electronics and field of power, more particularly to one circle control
Rate factor lead-lag control strategy.
Background technology
One circle control (One-Cycle Control, OCC) is a kind of non-linear big signal PWM control theories, while
It is a kind of simulation PWM control technologies.The control technology from load current harmonic wave influence, and be not required voltage sensor, lock
Phase ring and wave filter can just complete the tracking to electric current, have very strong robustness.With traditional instantaneous nothing based on d-q conversion
Work(Power Theory technology, Repetitive controller are compared with PR controls, all have significant advantage in the complexity and cost of algorithm.Cause
This, this technology is widely used in the association areas such as PFC, active power filter i.e. static reactive generator,
And more and more receive the concern of domestic and foreign scholars.
But traditional one circle control can only be run under unity power factor, it is impossible to realize that electric current is advanced or lags
The control of voltage-phase, therefore, at present tradition one circle control under current phase and do not have controllability, this indicates that tradition
Quantitative output of the one circle control for reactive power and accurate control can not realize that this greatly constrains the monocycle
The application range and occasion of control.
So neither increasing the complexity of one circle control there is an urgent need to a kind of, and it need not additionally increase voltage biography
It can be achieved with electronic power convertor input power factor angular advance Delay control plan in the case of sensor, phaselocked loop and wave filter
Slightly, this improves the equipment performance of the association areas such as existing reactive-load compensation, improves economical for expanding one circle control application range
Benefit is of great significance.
The content of the invention
Neither increase the complexity of one circle control the object of the present invention is to provide a kind of, and need not additionally increase electricity
It can be achieved with electronic power convertor input power factor angular advance/hysteresis in the case of pressure sensor, phaselocked loop and wave filter
The control strategy of operation.The control strategy enable current phase leading voltage, lagging voltage or the unit power of exchange side because
Number operation.
Thus, using this control strategy proposed by the present invention, can make power electronic equipment send it is quantitative advanced or
Idle, the ability for making the power electronic equipment of one circle control that there is electric current accurately to control of person's hysteresis.The strategy can be applied
It is all can use monocycle control method circuit topology in, mainly include：Single-phase full bridge PWM converter, three-phase are complete
Bridge PWM converter, single-phase VIENNA rectifier, three/six Switch Three-Phase VIENNA rectifiers of switch, line voltage cascaded three-phase
VIENNA rectifier, the star-like current transformer of H bridges cascade three-phase, cascade the star-like current transformer of three-phase, single-phase VIENNA rectifier level without bridge
Join the star-like rectifier of three-phase and based on H bridges, the star-like rectifier of the Mixed cascading three-phase without bridge and single-phase VIENNA rectifier etc..
To reach above-mentioned purpose, the electronic power convertor power factor lead-lag control plan of one circle control of the present invention
Slightly the step of, is as follows：
(1) the DC side output voltage of electronic power convertor known to is Ud, current transformer equiva lent impedance is Z, and current transformer is handed over
Stream side current sampling resistor is Rs, AC side of converter three-phase current is ia、ib、ic(monophase current is), current amplitude Im,
Electric current angular frequency is ω, run time t, as equiva lent impedance Z=ReWhen, then three-phase current is expressed as：
Electric current is expressed as in monophase system：
is=Imsin(ωt)
(2) AC sampling resistance R is passed throughsTo three-phase current ia、ib、icSampled, obtain sampled signal Rsia、Rsib、
Rsic(in monophase system, pass through AC sampling resistance RsTo electric current isSampled, obtain sampled signal)；
(3) by the sampled signal R in step (2)sia、Rsib、Rsic(sampled signal is R in monophase systemsis) take to computing
In circuit, superimposed current phase shifting angle is obtainedRelation between superimposed current penalty coefficient k and actual current phase shifting angle θ is as follows：
As available from the above equation, actual current phase shifting angle θ is by superimposed current phase shifting angleDetermined with superimposed current penalty coefficient k, tool
Body has following three kinds of control modes：
(a) superimposed current phase shifting angle is keptIt is constant, by varying superimposed current penalty coefficient k come determine actual current move
Phase angle theta, then superimposed current penalty coefficient k be expressed as：
(b) keep superimposed current penalty coefficient k constant, actual current phase shift is determined by varying superimposed current phase shifting angle
Angle θ, then superimposed current phase shifting angleIt is expressed as：
(c) while superimposed current phase shifting angle is changedActual current phase shifting angle θ is determined with superimposed current penalty coefficient k；
(4) by the sampled signal R in step (2)sia、Rsib、Rsic(sampled signal is R in monophase systemsis) it is used as phase shift
The input of circuit, is known by step (3), required superimposed current phase shifting angleIt is calculated by computing circuit；
(5) input using the signal after phase shift in step (4) as coefficient circuit, is that the signal increases a ratio control
System, is known, required superimposed current penalty coefficient k is calculated by computing circuit by step (3)；
(6) the sampled signal R obtained in step (2)sia、Rsib、Rsic(sampled signal is R in monophase systemsis) and step
(5) signal that coefficient circuit exports in, is added by adder is corresponding respectively, obtains three-phase superposed signal.Electric current after superposition
It is expressed as：
For monophase system, the electric current after superposition is expressed as：
(7) three-phase (single-phase) superposed signal in step (6) is obtained into absolute value signal by rectification circuit；
(8) in order to ensure superimposed current phase shifting angleIt is with superimposed current penalty coefficient k significant, i.e. Guarantee control system
Control signal not overshoot, ensures system stability, and three-phase (single-phase) absolute value signal obtained in step (7) is sent into limiter
In, make signal within the scope of controllable, known by step (3), required amplitude limit angle value size is provided by computing circuit, restriction relation
For：
(9) in electronic power convertor DC voltage outer shroud, according to step (1), electronic power convertor DC side
Voltage reference valueWith DC side feedback voltage UdPressure difference signal e is exported after subtracteru, euIt is expressed as：
Amplitude U of output of the pressure difference signal after voltage regulator PI controls as carrier signalm, can by one circle control
Know UmIt is expressed as below：
Wherein Z is load impedance：
Z=Re+j(XL-XC)
(10) three-phase (single-phase) superposed signal in step (8) after amplitude limit, the amplitude with being produced by carrier generation circuit are
umCarrier signal, by comparator carry out signal complete a business transaction produce pwm signal be sent into bus, and then control electronic power convertor
The break-make of middle switching device.
Advantage of the invention is that：
(1) control strategy proposed by the present invention can make to realize using the electronic power convertor of one circle control strategy defeated
Enter the operation of power-factor angle lead-lag.
(2) control strategy proposed by the present invention is not required voltage sensor, phaselocked loop just to complete the tracking to electric current, Shandong
Rod is good.
(3) present invention need not use the larger structure of the delay such as low-pass filter, thus control delay extremely short, and control is real
When property is good.
(4) calculation amount of the present invention is few, and step is simple, it is not necessary to complicated control structure.
(5) present invention uses Two dimensional control, and the accurate control of electric current, flexibility can be realized by multigroup control strategy
By force.
(6) present invention can be applied in any circuit topology using one circle control, be greatly expanded the monocycle
The application range of algorithm, enhances the ability using one circle control circuit topology, has very strong eurytopicity.
It is described in detail referring to the drawings below in conjunction with embodiment.
Brief description of the drawings
Fig. 1 is the schematic diagram of the present invention；
Fig. 2 is the topological structure of three phase full bridge PWM converter in embodiment；
Fig. 3 is the topological structure of single-phase full bridge PWM converter；
Fig. 4 is the topological structure of single-phase VIENNA circuits；
Fig. 5 is the topological structure of three switch VIENNA circuits；
Fig. 6 is the topological structure of six switch VIENNA circuits；
Fig. 7 is the topological structure of line voltage cascaded three-phase VIENNA rectifier；
Fig. 8 is the topological structure of the H bridges cascade star-like current transformer of three-phase；
Fig. 9 is the topological structure of no bridge cascade star-like current transformer of three-phase；
Figure 10 is the topological structure of the single-phase VIENNA rectifier cascade star-like rectifier of three-phase；
Figure 11 is the topology knot based on H bridges, the star-like rectifier of the Mixed cascading three-phase without bridge and single-phase VIENNA rectifier
Structure；
Figure 12 is the simulation waveform that three phase full bridge current transformer unity power factor is run in embodiment；
Figure 13 is the simulation waveform that three phase full bridge current transformer three-phase current is ahead of three-phase voltage in embodiment；
Figure 14 is the simulation waveform that three phase full bridge current transformer three-phase current lags behind three-phase voltage in embodiment.
Embodiment
The electronic power convertor power factor lead-lag control strategy of one circle control of the present invention, for it is all can be with
Using one circle control electric and electronic power topological circuit include single-phase full bridge PWM converter, three phase full bridge PWM converter,
Single-phase VIENNA rectifier, three/six Switch Three-Phase VIENNA rectifiers of switch, line voltage cascaded three-phase VIENNA rectifier, H bridges
Cascade the star-like current transformer of three-phase, without the star-like current transformer of bridge cascade three-phase, the single-phase VIENNA rectifier cascade star-like rectifier of three-phase
It is applicable in based on H bridges, the star-like rectifier of the Mixed cascading three-phase without bridge and single-phase VIENNA rectifier etc., can realizes friendship
The advanced or Delay control of side electric current within the specific limits is flowed, its corresponding circuit topology schematic diagram is with reference to Fig. 2 to Figure 11.
Following embodiments are only used for clearly demonstrating technical scheme, and the guarantor of the present invention cannot be limited with this
Protect scope.
Below using three phase full bridge PWM rectifier as embodiment, with reference to diagram, the invention will be further described：
Referring to Figures 1 and 2, the electronic power convertor power factor lead-lag control strategy of one circle control of the present invention
The step of it is as follows：
(1) the DC side output voltage of electronic power convertor known to is Ud, current transformer equiva lent impedance is Z, and current transformer is handed over
Stream side current sampling resistor is Rs, AC side of converter three-phase current is ia、ib、ic, current amplitude Im, electric current angular frequency is
ω, run time t, as equiva lent impedance Z=ReWhen, then three-phase current is expressed as：
(2) AC sampling resistance R is passed throughsTo three-phase current ia、ib、icSampled, obtain sampled signal Rsia、Rsib、
Rsic；
(3) by the sampled signal R in step (2)sia、Rsib、RsicTake into computing circuit, obtain superimposed current phase shifting angleRelation between superimposed current penalty coefficient k and actual current phase shifting angle θ is as follows：
As available from the above equation, actual current phase shifting angle θ is by superimposed current phase shifting angleDetermined with superimposed current penalty coefficient k, tool
Body has following three kinds of control modes：
(a) superimposed current phase shifting angle is keptIt is constant, by varying superimposed current penalty coefficient k come determine actual current move
Phase angle theta, then superimposed current penalty coefficient k be expressed as：
(b) keep superimposed current penalty coefficient k constant, by varying superimposed current phase shifting angleTo determine that actual current moves
Phase angle theta, then superimposed current phase shifting angleIt is expressed as：
(c) while superimposed current phase shifting angle is changedActual current phase shifting angle θ is determined with superimposed current penalty coefficient k；
(4) by the sampled signal R in step (2)sia、Rsib、RsicAs the input of phase-shift circuit, known by step (3), institute
Need superimposed current phase shifting angleIt is calculated by computing circuit；
(5) input using the signal after phase shift in step (4) as coefficient circuit, is that the signal increases a ratio control
System, is known, required superimposed current penalty coefficient k is calculated by computing circuit by step (3)；
(6) the sampled signal R obtained in step (2)sia、Rsib、RsicThe signal exported with coefficient circuit in step (5),
It is added by adder is corresponding respectively, obtains three-phase superposed signal.Electric current after superposition is expressed as：
(7) the three-phase superposed signal in step (6) is obtained into absolute value signal by rectification circuit；
(8) in order to ensure superimposed current phase shifting angleIt is with superimposed current penalty coefficient k significant, i.e. Guarantee control system
Control signal not overshoot, ensures system stability, and the three-phase absolute value signal obtained in step (7) is sent into limiter, is made
Signal is known that required amplitude limit angle value size is provided by computing circuit, and restriction relation is within the scope of controllable by step (3)：
(9) in electronic power convertor DC voltage outer shroud, according to step (1), electronic power convertor DC side
Voltage reference valueWith DC side feedback voltage UdPressure difference signal e is exported after subtracteru, euIt is expressed as：
Amplitude U of output of the pressure difference signal after voltage regulator PI controls as carrier signalm, can by one circle control
Know UmIt is expressed as below：
Wherein Z is load impedance：
Z=Re+j(XL-XC)
(10) the three-phase superposed signal in step (8) after amplitude limit, is u with the amplitude produced by carrier generation circuitmLoad
Ripple signal, carries out signal by comparator and completes a business transaction generation pwm signal feeding bus, and then controls and switched in electronic power convertor
The break-make of device.
In order to confirm the validity of the control strategy, control strategy is emulated with reference to industrial reality.
For simulation waveform as shown in Figure 12, Figure 13, Figure 14, wherein Figure 12 is ac-side current and the ripple of voltage in phase operation
Shape figure, Figure 13 are that ac-side current phase is ahead of voltage-operated oscillogram, and Figure 14 is that ac-side current phase lags behind electricity
Press the oscillogram of operation.As can be seen that by the control strategy of the present invention, the three phase full bridge PWM for changing one circle control is whole
The ac-side current phase of device is flowed, realizes the mesh of three phase full bridge PWM rectifiers input power factor angular advance/hysteresis operation
, it was demonstrated that the validity of the electronic power convertor power factor lead-lag control strategy of one circle control of the present invention.
The above-described embodiments are merely illustrative of preferred embodiments of the present invention, not to the structure of the present invention
Think and scope is defined, under the premise of designing scheme of the present invention is not departed from, engineers and technicians are based on the present invention in this area
The all variations and modifications made of technical solution, protection scope of the present invention, the claimed technology of the present invention should all be fallen into
Content, has all been recorded in detail in the claims.
Claims (1)
1. the electronic power convertor power factor lead-lag control strategy of one circle control, the electronic power convertor
Including single-phase full bridge PWM converter, three phase full bridge PWM converter, single-phase VIENNA rectifier, three/six Switch Three-Phases of switch
VIENNA rectifier, line voltage cascaded three-phase VIENNA rectifier, H bridges cascade the star-like current transformer of three-phase, cascade three-phase star without bridge
Type current transformer, the single-phase VIENNA rectifier star-like rectifier of cascade three-phase and based on H bridges, without bridge and single-phase VIENNA rectifier
All circuit topologies that can use monocycle control method such as the star-like rectifier of Mixed cascading three-phase；
It is characterized in that：The relevant parameter of electronic power convertor input and output is determined first；Then require to carry out according to phase shift
Superimposed current phase shifting angleCalculated with the parameter of superimposed current penalty coefficient k；Finally according to control parameter in current feedback loop
Introducing ratio phase shift link, and by the output Signal averaging into primary current backfeed loop.
The electronic power convertor input power factor angular advance hysteresis control strategy step based on one circle control is as follows：
(1) the DC side output voltage of electronic power convertor known to is Ud, current transformer equiva lent impedance is Z, and AC side of converter is electric
Stream sampling resistor is Rs, AC side of converter three-phase current is ia、ib、ic(monophase current is), current amplitude Im, electric current angle
Frequency is ω, run time t, as equiva lent impedance Z=ReWhen, then three-phase current is expressed as：
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Electric current is expressed as in monophase system：
is=Imsin(ωt)
(2) AC sampling resistance R is passed throughsTo three-phase current ia、ib、icSampled, obtain sampled signal Rsia、Rsib、Rsic(
In monophase system, pass through AC sampling resistance RsTo electric current isSampled, obtain sampled signal Rsis)；
(3) by the sampled signal R in step (2)sia、Rsib、Rsic(sampled signal is R in monophase systemsis) take to computing circuit
In, obtain superimposed current phase shifting angleRelation between superimposed current penalty coefficient k and actual current phase shifting angle θ is as follows：
As available from the above equation, actual current phase shifting angle θ is by superimposed current phase shifting angleDetermine specifically have with superimposed current penalty coefficient k
Following three kinds of control modes：
(a) superimposed current phase shifting angle is keptIt is constant, determine actual current phase shifting angle by varying superimposed current penalty coefficient k
θ, then superimposed current penalty coefficient k be expressed as：
(b) keep superimposed current penalty coefficient k constant, actual current phase shifting angle θ determined by varying superimposed current phase shifting angle,
Then superimposed current phase shifting angleIt is expressed as：
(c) while superimposed current phase shifting angle is changedActual current phase shifting angle θ is determined with superimposed current penalty coefficient k；
(4) by the sampled signal R in step (2)sia、Rsib、Rsic(sampled signal is R in monophase systemsis) it is used as phase-shift circuit
Input, known by step (3), required superimposed current phase shifting angleIt is calculated by computing circuit；
(5) input using the signal after phase shift in step (4) as coefficient circuit, is that the signal increases a ratio control,
Known by step (3), required superimposed current penalty coefficient k is calculated by computing circuit；
(6) the sampled signal R obtained in step (2)sia、Rsib、Rsic(sampled signal is R in monophase systemsis) and step (5)
The signal of middle coefficient circuit output, is added by adder is corresponding respectively, obtains three-phase superposed signal.Electric current after superposition represents
For：
For monophase system, the electric current after superposition is expressed as：
(7) three-phase (single-phase) superposed signal in step (6) is obtained into absolute value signal by rectification circuit；
(8) in order to ensure superimposed current phase shifting angleIt is significant with superimposed current penalty coefficient k, i.e. the control of Guarantee control system
Signal not overshoot, ensures system stability, and three-phase (single-phase) absolute value signal obtained in step (7) is sent into limiter,
Make signal within the scope of controllable, known by step (3), required amplitude limit angle value size is provided by computing circuit, and restriction relation is：
(9) in electronic power convertor DC voltage outer shroud, according to step (1), electronic power convertor DC voltage
Reference valueWith DC side feedback voltage UdPressure difference signal e is exported after subtracteru, euIt is expressed as：
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Amplitude U of output of the pressure difference signal after voltage regulator PI controls as carrier signalm, U is understood by one circle controlm
It is expressed as below：
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Wherein Z is load impedance：
Z=Re+j(XL-XC)
(10) three-phase (single-phase) superposed signal in step (8) after amplitude limit, is u with the amplitude produced by carrier generation circuitmLoad
Ripple signal, carries out signal by comparator and completes a business transaction generation pwm signal feeding bus, and then controls and switched in electronic power convertor
The break-make of device.
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| CN110380633A (en) * | 2019-07-31 | 2019-10-25 | 太原理工大学 | A kind of electric current modification method being directed under non-ideal power grid based on one circle control |
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| CN110380633A (en) * | 2019-07-31 | 2019-10-25 | 太原理工大学 | A kind of electric current modification method being directed under non-ideal power grid based on one circle control |
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|---|---|
| CN108039812B (en) | 2018-12-04 |
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