CN106558977B - Three-phase three-wire system inverter and its output current control method and control system - Google Patents
Three-phase three-wire system inverter and its output current control method and control system Download PDFInfo
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- CN106558977B CN106558977B CN201710030018.XA CN201710030018A CN106558977B CN 106558977 B CN106558977 B CN 106558977B CN 201710030018 A CN201710030018 A CN 201710030018A CN 106558977 B CN106558977 B CN 106558977B
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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
- H02M1/14—Arrangements for reducing ripples from dc 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
- H02M1/0003—Details of control, feedback or regulation circuits
-
- 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
- H02M1/0038—Circuits or arrangements for suppressing, e.g. by masking incorrect turn-on or turn-off signals, e.g. due to current spikes in current mode control
Abstract
This application discloses three-phase three-wire system inverter and its output current control method and control system, which includes：Sampling obtains the DC component in three-phase three-wire system inverter output current and AC compounent respectively；Common mode differential mode separation is carried out to the DC component, extracts difference mode signal；The difference mode signal is handled using adjuster；By treated, difference mode signal is added in the AC compounent, collectively as the value of feedback of electric current loop；Wherein, the electric current loop is used for the control of three-phase three-wire system inverter output current in given value, to realize the purpose for inhibiting the DC component in three-phase three-wire system inverter output current.
Description
Technical field
The present invention relates to power electronics fields, more specifically to three-phase three-wire system inverter and its output electricity
Method of flow control and control system.
Background technology
Theoretically, three-phase three-wire system inverter output current is sinusoidal ac, but in practical application, by busbar voltage
The factors such as imbalance, circuit parameter deviation, sampling deviation, switching tube parameter differences influence, and lead to the phase three-wire three actually obtained
Inevitably there is DC component in inverter output current processed.If not taking effective measure to inhibit three-phase three-wire system
DC component in inverter output current may cause access transformer Point Drifting, transformer is led to problems such as to be saturated.
Invention content
In view of this, the present invention provides three-phase three-wire system inverter and its output current control method and control system,
To realize the purpose for inhibiting the DC component in three-phase three-wire system inverter output current.
A kind of three-phase three-wire system inverter output current control method, including：
Sampling obtains the DC component in three-phase three-wire system inverter output current and AC compounent respectively；
Common mode differential mode separation is carried out to the DC component, extracts difference mode signal；
The difference mode signal is handled using adjuster；
By treated, difference mode signal is added in the AC compounent, collectively as the value of feedback of electric current loop；
Wherein, the electric current loop is used to control three-phase three-wire system inverter output current in given value.
Another three-phase three-wire system inverter output current control method, including：
Sampling obtains the DC component in three-phase three-wire system inverter output current and AC compounent respectively；
Common mode differential mode separation is carried out to the DC component, extracts difference mode signal；
The difference mode signal is handled using adjuster；
Using the AC compounent as the value of feedback of electric current loop, and will treated difference mode signal the is added to electric current loop
On the modulating wave of output；
Wherein, the electric current loop is used to control three-phase three-wire system inverter output current in given value.
Wherein, described that common mode differential mode separation is carried out to the DC component, difference mode signal is extracted, including：
According to the DC component, the common-mode signal of three-phase three-wire system inverter output is calculated；
According to the DC component and the common mode component, the differential mode letter of three-phase three-wire system inverter output is calculated
Number.
Wherein, described to handle the difference mode signal using adjuster, including：The differential mode is handled using pi regulator to believe
Number.
A kind of three-phase three-wire system inverter output current control system, including：
Sample circuit, for sampling to obtain the DC component in three-phase three-wire system inverter output current respectively and exchanging point
Amount；
Processor, the DC component for being arrived to the sampling circuit samples carry out common mode differential mode separation, extract differential mode
Signal；The difference mode signal is handled using adjuster；By treated, difference mode signal is added to what the sampling circuit samples arrived
In AC compounent, collectively as the value of feedback of electric current loop；
Wherein, the electric current loop is used to control three-phase three-wire system inverter output current in given value.
Another three-phase three-wire system inverter output current control system, including：
Sample circuit, for sampling to obtain the DC component in three-phase three-wire system inverter output current respectively and exchanging point
Amount；
Processor, the DC component for being arrived to the sampling circuit samples carry out common mode differential mode separation, extract differential mode
Signal；The difference mode signal is handled using adjuster；The AC compounent that the sampling circuit samples are arrived is as the anti-of electric current loop
Feedback, and difference mode signal is added on the modulating wave of the electric current loop output by treated；
Wherein, the electric current loop is used to control three-phase three-wire system inverter output current in given value.
Wherein, processor carries out common mode differential mode separation to the DC component, extracts difference mode signal, specifically includes：
The common-mode signal of three-phase three-wire system inverter output is calculated according to the DC component in processor；According to institute
DC component and the common mode component are stated, the difference mode signal of three-phase three-wire system inverter output is calculated.
Wherein, the adjuster is pi regulator.
A kind of three-phase three-wire system inverter, including：Any three-phase three-wire system inverter output current as disclosed above
Control system.
It can be seen from the above technical scheme that theoretically, the three-phase three-wire system inverter sampled is exported electricity
Stream DC component is added to three-phase three-wire system inverter output current closed-loop control system (i.e. electric current loop) after device processing after the adjustment
Feedback or output on, can utilize electric current loop by three-phase three-wire system inverter output current control in given value, to reach
Inhibit the purpose of the DC component in three-phase three-wire system inverter output current.But in practical application, due to the adjuster
Integral element can introduce common-mode signal, so the present invention first carries out common mode differential mode separation to the DC component that samples, then
It replaces the DC component sampled to be applied in said program the DC component after rejecting common-mode signal, avoids in this way
The introducing of common-mode signal.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of three-phase three-wire system inverter output current control method flow chart disclosed by the embodiments of the present invention；
Fig. 2 is another three-phase three-wire system inverter output current control method flow chart disclosed by the embodiments of the present invention；
Fig. 3 is a kind of current loop control system principle diagram disclosed by the embodiments of the present invention；
Fig. 4 is another current loop control system principle diagram disclosed by the embodiments of the present invention；
Fig. 5 is the corresponding current loop control system principle diagrams of Fig. 1；
Fig. 6 is the corresponding current loop control system principle diagrams of Fig. 2；
Fig. 7 is a kind of three-phase three-wire system inverter output current Control system architecture signal disclosed by the embodiments of the present invention
Figure.
Specific implementation mode
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation describes, it is clear that described embodiments are only a part of the embodiments of the present invention, instead of all the embodiments.It is based on
Embodiment in the present invention, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall within the protection scope of the present invention.
Referring to Fig. 1, the embodiment of the invention discloses a kind of three-phase three-wire system inverter output current control methods, to realize
Inhibit the purpose of the DC component in three-phase three-wire system inverter output current, including：
Step S01：Sampling obtains the DC component in three-phase three-wire system inverter output current and AC compounent respectively；
Step S02：Common mode differential mode separation is carried out to the DC component, extracts difference mode signal；
Step S03：The difference mode signal is handled using adjuster；
Step S04：By treated, difference mode signal is added in the AC compounent, collectively as the feedback of electric current loop
Value；Wherein, the electric current loop is used to control three-phase three-wire system inverter output current in given value.
Referring to Fig. 2, the embodiment of the invention discloses another three-phase three-wire system inverter output current control methods, with reality
Now inhibit the purpose of the DC component in three-phase three-wire system inverter output current, including：
Step S01：Sampling obtains the DC component in three-phase three-wire system inverter output current and AC compounent respectively；
Step S02：Common mode differential mode separation is carried out to the DC component, extracts difference mode signal；
Step S03：The difference mode signal is handled using adjuster；
Step S04：Using the AC compounent as the value of feedback of electric current loop, and will treated difference mode signal is added to institute
On the modulating wave for stating electric current loop output；Wherein, the electric current loop be used for by three-phase three-wire system inverter output current control to
Definite value.
In the following, being described in detail to Fig. 1 and technical solution shown in Fig. 2.
Three-phase three-wire system inverter output waveforms are frequently with voltage and current Double-loop Control Strategy, wherein electric current loop gives
Value is the output (or can also directly give) of Voltage loop, and the value of feedback of electric current loop is the three-phase three-wire system inversion that sampling obtains
Device output current, the opposite direction that current loop controller deviates given value according to value of feedback change modulating wave, and modulating wave is sent out through PWM
PWM wave, which is generated, after raw device processing removes driving three-phase three-wire system inverter.
In order to inhibit the DC component in three-phase three-wire system inverter output current, scheme possible in theory to have following two
Kind.
Scheme 1：Sampling obtains the DC component in three-phase three-wire system inverter output current and AC compounent respectively；By institute
It states DC component to be added in the AC compounent after device (such as PI is adjusted) is handled after the adjustment, collectively as the electric current loop
Value of feedback.The corresponding current loop control system principle diagram of this programme is as shown in Figure 3.
Scheme 2：Sampling obtains the DC component in three-phase three-wire system inverter output current and AC compounent respectively；By institute
State feedback of the AC compounent as electric current loop, and by the institute that is added to after the DC component after the adjustment device (such as PI is adjusted) processing
On the modulating wave for stating electric current loop output.The corresponding current loop control system principle diagram of this programme is as shown in Figure 4.
Scheme 1 changes three-phase three-wire system inverter output current by changing the value of feedback of electric current loop, and scheme 2 is by changing
The modulating wave of time-dependent current ring output changes three-phase three-wire system inverter output current.For both schemes, due to electric current loop
Given value be exactly the desired sinusoidal ac without DC component, so when electric current loop reaches stable state, that is,
By the control of three-phase three-wire system inverter output current in given value, inhibition three-phase three-wire system inverter output electricity is also just reached
The purpose of DC component in stream.But it is influenced by factors such as temperature drift, the drifts sampled, the integral element of the adjuster can introduce
(DC component in three-phase three-wire system inverter output current is the period of three-phase three-wire system inverter output current to common-mode signal
Average value, the main purpose of adjuster are to realize the Stability and dependability of control, are prevented in three-phase three-wire system invertor operation
The voltage of appearance, current fluctuation lead to DC component control is unstable, fluctuation is larger etc..If being not added with adjuster, in actual electric network
In operation, the control of the DC component in three-phase three-wire system inverter output current will be difficult to meet the requirements, so adjuster is
Essential link), the presence of common-mode signal can cause adjuster to be saturated, while can be to generations such as leakage current, modulation degree not
Profit influences.
Meet such as between DC component, common-mode signal, difference mode signal in known three-phase three-wire system inverter output current
Lower relationship：
In formula, idc (comm) is common-mode signal；Idc_a, idc_b, idc_c are respectively three-phase three-wire system inverter A phases, B
DC component in phase, C phase output currents；Idc_a (diff), idc_b (diff), idc_c (diff) are respectively phase three-wire three
Inverter A phase, B phase, C phase difference mode signal processed.
Based on this, to avoid while the DC component in inhibiting three-phase three-wire system inverter output current, introduce altogether
Mould signal, feasible solution are：DC component in collected three-phase three-wire system inverter output current is total to
Mould differential mode detaches, and then eliminates the common-mode signal having been introduced into, (is equivalent to without common-mode signal by the difference mode signal isolated
DC component) DC component application in collected three-phase three-wire system inverter output current is replaced after device processing after the adjustment
Into above two scheme, to change three-phase three-wire system inverter by changing value of feedback or the modulating wave of electric current loop
When output current, it will be able to while the DC component in inhibiting three-phase three-wire system inverter output current, avoid generating altogether
Mould signal.Fig. 1 is the solution that the embodiment of the present invention is directed to that said program 1 proposes, corresponding current loop control system is former
It is as shown in Figure 5 to manage block diagram；Fig. 2 is the solution that the embodiment of the present invention is directed to that scheme 2 proposes, corresponding current loop control system
Functional block diagram is as shown in Figure 6.
Wherein, common mode differential mode separation is carried out to the DC component in three-phase three-wire system inverter output current, extracts difference
The method of mould signal, can according in three-phase three-wire system inverter output current DC component, common-mode signal, between difference mode signal
The relationship of satisfaction obtains, and specifically includes：
First, according to the DC component in collected three-phase three-wire system inverter output current, three-phase three is calculated
The common-mode signal of line inverter output, corresponding calculation formula are
Idc (comm)=(idc_a+idc_b+idc_c)/3
Then, according in collected three-phase three-wire system inverter output current DC component and the common mode that is calculated
Component, is calculated the difference mode signal of three-phase three-wire system inverter output, and corresponding calculation formula is
Seen from the above description, theoretically, the three-phase three-wire system inverter output current DC component that will be sampled
The feedback or defeated for the three-phase three-wire system inverter output current closed-loop control system (i.e. electric current loop) that is added to after device processing after the adjustment
On going out, electric current loop can be utilized to control three-phase three-wire system inverter output current in given value, inhibit three-phase three to reach
The purpose of DC component in line inverter output current.But in practical application, due to the integral element of the adjuster
Common-mode signal can be introduced, so the present invention first carries out common mode differential mode separation to the DC component sampled, then will reject common mode
DC component after signal replaces the DC component sampled to be applied in said program, avoids common-mode signal in this way
It introduces.
Referring to Fig. 7, the embodiment of the invention discloses a kind of three-phase three-wire system inverter output current control systems, to realize
Inhibit the purpose of the DC component in three-phase three-wire system inverter output current, including：
Sample circuit 100 obtains the DC component in three-phase three-wire system inverter output current and friendship for sampling respectively
Flow component；
Processor 200, the DC component for being sampled to sample circuit 100 carry out common mode differential mode separation, extract difference
Mould signal；The difference mode signal is handled using adjuster；By treated, difference mode signal is added to what sample circuit 100 sampled
In AC compounent, collectively as the value of feedback of electric current loop；
Wherein, the electric current loop is used to control three-phase three-wire system inverter output current in given value.
In addition, the embodiment of the invention also discloses another three-phase three-wire system inverter output current control systems, with reality
Now inhibit the purpose of the DC component in three-phase three-wire system inverter output current, including：
Sample circuit, for sampling to obtain the DC component in three-phase three-wire system inverter output current respectively and exchanging point
Amount；
Processor, the DC component for being arrived to the sampling circuit samples carry out common mode differential mode separation, extract differential mode
Signal；The difference mode signal is handled using adjuster；The AC compounent that the sampling circuit samples are arrived is as the anti-of electric current loop
Feedback, and difference mode signal is added on the modulating wave of the electric current loop output by treated；
Wherein, the electric current loop is used to control three-phase three-wire system inverter output current in given value.
Wherein, for any three-phase three-wire system inverter output current control system disclosed above, processor
Common mode differential mode separation is carried out to the DC component, difference mode signal is extracted, specifically includes：Processor is according to the direct current point
The common-mode signal of three-phase three-wire system inverter output is calculated in amount；According to the DC component and the common mode component, calculate
Obtain the difference mode signal of three-phase three-wire system inverter output.
Wherein, for any three-phase three-wire system inverter output current control system disclosed above, the tune
Section device is pi regulator, but is not limited to.
In addition, the embodiment of the invention also discloses a kind of three-phase three-wire system inverters, including it is as disclosed above any
Three-phase three-wire system inverter output current control system.
In conclusion theoretically, after the adjustment by the three-phase three-wire system inverter output current DC component sampled
In the feedback for the three-phase three-wire system inverter output current closed-loop control system (i.e. electric current loop) that is added to after device processing or output, energy
It enough utilizes electric current loop to control three-phase three-wire system inverter output current in given value, inhibits three-phase three-wire system inversion to reach
The purpose of DC component in device output current.But in practical application, since the integral element of the adjuster can introduce altogether
Mould signal, so the present invention first carries out common mode differential mode separation to the DC component sampled, after then rejecting common-mode signal
DC component replaces the DC component sampled to be applied in said program, avoids the introducing of common-mode signal in this way.
Each embodiment is described by the way of progressive in this specification, the highlights of each of the examples are with other
The difference of embodiment, just to refer each other for identical similar portion between each embodiment.For system disclosed in embodiment
For, since it is corresponded to the methods disclosed in the examples, so description is fairly simple, related place is said referring to method part
It is bright.
The foregoing description of the disclosed embodiments enables those skilled in the art to implement or use the present invention.
Various modifications to these embodiments will be apparent to those skilled in the art, as defined herein
General Principle can in other embodiments be realized in the case where not departing from the spirit or scope of the embodiment of the present invention.Therefore,
The embodiment of the present invention is not intended to be limited to the embodiments shown herein, and be to fit to principles disclosed herein and
The consistent widest range of features of novelty.
Claims (9)
1. a kind of three-phase three-wire system inverter output current control method, which is characterized in that including：
Sampling obtains the DC component in three-phase three-wire system inverter output current and AC compounent respectively；
Common mode differential mode separation is carried out to the DC component, extracts difference mode signal；
The difference mode signal is handled using adjuster；
By treated, difference mode signal is added in the AC compounent, collectively as the value of feedback of electric current loop；
Wherein, the electric current loop is used to control three-phase three-wire system inverter output current in given value.
2. a kind of three-phase three-wire system inverter output current control method, which is characterized in that including：
Sampling obtains the DC component in three-phase three-wire system inverter output current and AC compounent respectively；
Common mode differential mode separation is carried out to the DC component, extracts difference mode signal；
The difference mode signal is handled using adjuster；
Using the AC compounent as the value of feedback of electric current loop, and will treated difference mode signal the is added to electric current loop output
Modulating wave on；
Wherein, the electric current loop is used to control three-phase three-wire system inverter output current in given value.
3. three-phase three-wire system inverter output current control method according to claim 1 or 2, which is characterized in that described
Common mode differential mode separation is carried out to the DC component, extracts difference mode signal, including：
According to the DC component, the common-mode signal of three-phase three-wire system inverter output is calculated；
According to the DC component and the common-mode signal, the difference mode signal of three-phase three-wire system inverter output is calculated.
4. three-phase three-wire system inverter output current control method according to claim 1 or 2, which is characterized in that described
The difference mode signal is handled using adjuster, including：
The difference mode signal is handled using pi regulator.
5. a kind of three-phase three-wire system inverter output current control system, which is characterized in that including：
Sample circuit, for sampling to obtain DC component and AC compounent in three-phase three-wire system inverter output current respectively；
Processor, the DC component for being arrived to the sampling circuit samples carry out common mode differential mode separation, extract difference mode signal；
The difference mode signal is handled using adjuster；By treated difference mode signal is added to exchange point that the sampling circuit samples arrive
In amount, collectively as the value of feedback of electric current loop；
Wherein, the electric current loop is used to control three-phase three-wire system inverter output current in given value.
6. a kind of three-phase three-wire system inverter output current control system, which is characterized in that including：
Sample circuit, for sampling to obtain DC component and AC compounent in three-phase three-wire system inverter output current respectively；
Processor, the DC component for being arrived to the sampling circuit samples carry out common mode differential mode separation, extract difference mode signal；
The difference mode signal is handled using adjuster；The AC compounent that the sampling circuit samples are arrived as the feedback of electric current loop, and
By treated, difference mode signal is added on the modulating wave of the electric current loop output；
Wherein, the electric current loop is used to control three-phase three-wire system inverter output current in given value.
7. three-phase three-wire system inverter output current control system according to claim 5 or 6, which is characterized in that processing
Device carries out common mode differential mode separation to the DC component, extracts difference mode signal, specifically includes：
The common-mode signal of three-phase three-wire system inverter output is calculated according to the DC component in processor；According to described straight
The difference mode signal of three-phase three-wire system inverter output is calculated in flow component and the common-mode signal.
8. three-phase three-wire system inverter output current control system according to claim 5 or 6, which is characterized in that described
Adjuster is pi regulator.
9. a kind of three-phase three-wire system inverter, which is characterized in that including：Three-phase three as described in any one of claim 5-8
Line inverter output current control system.
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| CN101335491A (en) * | 2007-06-27 | 2008-12-31 | 通用电气公司 | Cross current control for power converter system |
| CN101567638A (en) * | 2009-01-14 | 2009-10-28 | 南京航空航天大学 | Active output direct-current component control inverter and control method thereof |
| CN102437760A (en) * | 2010-09-29 | 2012-05-02 | 通用电气公司 | DC-link voltage balancing system and method for multilevel converters |
| CN203337725U (en) * | 2013-06-25 | 2013-12-11 | 广东明阳龙源电力电子有限公司 | Sampling circuit for network side phase voltage in grid connected photovoltaic inverter system |
| WO2016149322A1 (en) * | 2015-03-16 | 2016-09-22 | Finsix Corporation | Midpoint control and gain scheduling for power converters |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US7180759B2 (en) * | 2004-11-03 | 2007-02-20 | Square D Company | Push-pull inverter with snubber energy recovery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101335491A (en) * | 2007-06-27 | 2008-12-31 | 通用电气公司 | Cross current control for power converter system |
| CN101567638A (en) * | 2009-01-14 | 2009-10-28 | 南京航空航天大学 | Active output direct-current component control inverter and control method thereof |
| CN102437760A (en) * | 2010-09-29 | 2012-05-02 | 通用电气公司 | DC-link voltage balancing system and method for multilevel converters |
| CN203337725U (en) * | 2013-06-25 | 2013-12-11 | 广东明阳龙源电力电子有限公司 | Sampling circuit for network side phase voltage in grid connected photovoltaic inverter system |
| WO2016149322A1 (en) * | 2015-03-16 | 2016-09-22 | Finsix Corporation | Midpoint control and gain scheduling for power converters |
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