CN105337482B - The suppressing method of single-phase grid-connected inverter output current harmonics - Google Patents
The suppressing method of single-phase grid-connected inverter output current harmonics Download PDFInfo
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- CN105337482B CN105337482B CN201510869737.1A CN201510869737A CN105337482B CN 105337482 B CN105337482 B CN 105337482B CN 201510869737 A CN201510869737 A CN 201510869737A CN 105337482 B CN105337482 B CN 105337482B
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- 238000010586 diagram Methods 0.000 description 15
- 238000001514 detection method Methods 0.000 description 7
- 230000004048 modification Effects 0.000 description 3
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- 230000010354 integration Effects 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 230000003068 static effect Effects 0.000 description 2
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- 230000003111 delayed effect Effects 0.000 description 1
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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
- H02M1/126—Arrangements for reducing harmonics from ac input or output using passive filters
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- Engineering & Computer Science (AREA)
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- Supply And Distribution Of Alternating Current (AREA)
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Abstract
The present invention provides a kind of suppressing method of single-phase grid-connected inverter output current harmonics.The suppressing method includes: that the voltage for the DC bus that will be sampled obtains feedback signal V after signal processingdc, and with DC bus a reference value VdcrefIt is compared to obtain DC bus error signal, grid-connected current magnitude reference I is obtained after PI is adjusted*；By grid-connected current magnitude reference I*It is multiplied to obtain grid-connected current reference signal i with by the sine table sin (ω t) of locking phase network voltagegridref, feedback signal i that the grid-connected current sampled is obtained after signal processinggridWith grid-connected current reference signal igridrefIt is compared, obtains grid-connected current error signal, grid-connected current modulated signal is obtained after PI is adjusted, meanwhile, the harmonic current-i of voltage feed-forward control signal and reversed polarity is addedh, obtain final modulated signal vreg.The suppressing method of single-phase grid-connected inverter output current harmonics provided by the invention, can effectively remove the output current harmonics of single-phase grid-connected inverter.
Description
Technical field
The present invention relates to the technical fields of photovoltaic system, in particular it relates to a kind of single-phase grid-connected photovoltaic inversion
The suppressing method of device output current harmonics.
Background technique
With being continuously increased for photovoltaic parallel in system installation amount, the influence exported for power grid quality is also more and more brighter
It is aobvious.The output current harmonics of photovoltaic DC-to-AC converter are a key factors for influencing power grid quality, inhibit the factor to become photovoltaic inverse
Become an important requirement of device.
Fig. 1 is a kind of single-phase grid-connected inverter control block diagram in the prior art.As shown, in traditional scheme, due to
It is to have static difference control when PI (Proportion Integration, proportional integration) control is for AC system, it can be with from figure
Find out, once contain harmonic component in grid-connected current, final modulated signal vregIt is middle necessarily to contain harmonic component, it is traditional
Single-phase grid-connected controller is unable to harmonic carcellation electric current.
Fig. 2 is another single-phase grid-connected inverter control block diagram in the prior art.As shown, it has harmonics restraint
Circuit, for harmonic carcellation electric current, grid-connected current controller generates the harmonic current-i of reversed polarityh, to offset in grid-connected current
Harmonic current, compared to Figure 1 compared with joined the harmonic component i of reversed polarity in grid-connected current benchmark linkh, generated with reaching
The harmonic component of reversed polarity.But as the harmonic current-i that reversed polarity is addedhAfterwards, the reference current of grid-connected current reforms into
I**sin(ωt)-ih, according to Theory of Automatic Control, the grid-connected current of output will track reference current, due in reference current
Harmonic component is contained, then still contains harmonic current in grid-connected current.Therefore existing single-phase grid-connected band harmonics restraint side
Method still cannot good harmonic carcellation electric current.
Summary of the invention
Technical problem to be solved by the invention is to provide a kind of inhibition sides of single-phase grid-connected inverter output current harmonics
Method can effectively remove the output current harmonics of single-phase grid-connected inverter.
In order to solve the above technical problems, a kind of inhibition side of single-phase grid-connected inverter output current harmonics provided by the invention
Method, comprising:
The voltage of the DC bus sampled is obtained into feedback signal V after signal processingdcWith DC bus base
Quasi- value VdcrefIt is compared to obtain DC bus error signal, and obtains grid-connected current magnitude reference after PI is adjusted
I*；
By the grid-connected current magnitude reference I*It is mutually multiplied with the sine table sin (ω t) of process locking phase network voltage
To grid-connected current reference signal igridref, feedback signal i that the grid-connected current sampled is obtained after signal processinggridWith
The grid-connected current reference signal igridrefIt is compared, obtains grid-connected current error signal, obtained after PI is adjusted grid-connected
Current modulated；
By the grid-connected current modulated signal and the mains voltage signal v after sampling processinggridAddition is had
The modulated signal of voltage feed-forward control；
Reversed polarity harmonic current-the i that will be obtained after the modulated signal and sampling processing with voltage feed-forward controlhPhase
Add, obtains final modulated signal vreg。
According to one embodiment of present invention, the reversed polarity harmonic current-i is obtainedhThe step of include:
Grid-connected current sampling；
The harmonic current i is calculatedh；
To the harmonic current ihIt carries out reversed polarity and handles acquisition-ih。
According to one embodiment of present invention, using low-pass filter, bandpass filter or bandstop filter, to it is described simultaneously
Net electric current is filtered, and removes the fundamental current in the grid-connected current, obtains the harmonic current ih。
According to one embodiment of present invention, using three-phase circuit reactive power theory, by linear transformation, from it is described simultaneously
Fundamental current is isolated in net electric current, to obtain harmonic current ih。
According to one embodiment of present invention, it falls using three-phase circuit instantaneous reactive power reason, by the grid-connected current structure
Three-phase circuit is caused, to obtain harmonic current ih。
According to one embodiment of present invention, it falls using three-phase circuit instantaneous reactive power reason, by the grid-connected current structure
Orthogonal two-phase circuit is caused, to obtain harmonic current.
A kind of suppressing method of single-phase grid-connected inverter output current harmonics provided by the invention, can effectively remove it is single-phase simultaneously
The output current harmonics of net inverter.
Detailed description of the invention
The above and other features of the present invention, property and advantage will pass through retouching with reference to the accompanying drawings and examples
It states and becomes readily apparent from, in which:
Fig. 1 is a kind of single-phase grid-connected inverter control block diagram in the prior art；
Fig. 2 is another single-phase grid-connected inverter control block diagram in the prior art；
Fig. 3 is the flow diagram of one embodiment of the present of invention；
Fig. 4 is the signal processing and control flow chart of one embodiment of the present of invention；
Fig. 5 is current harmonics component detection control block diagram (one) of the invention；
Fig. 6 is current harmonics component detection control block diagram (two) of the invention；
Fig. 7 is current harmonics component detection control block diagram (three) of the invention；
Fig. 8 is current harmonics component detection control block diagram (four) of the invention.
Specific embodiment
The invention will be further described with attached drawing combined with specific embodiments below, elaborates in the following description more
Details to facilitate a thorough understanding of the present invention, still the present invention obviously can be come with a variety of other ways different from this description it is real
It applies, those skilled in the art can make similar popularization according to practical situations without violating the connotation of the present invention, drill
It unravels silk, therefore should not be limited the scope of the invention with the content of this specific embodiment.
Fig. 3 is the flow diagram of one embodiment of the invention；Fig. 4 is the signal processing and control of one embodiment of the present of invention
Flow chart processed.It should be noted that these and subsequent other attached drawings are only as an example, it is not to be according to equal proportion
What condition was drawn, and should not be construed as limiting in this, as the protection scope to actual requirement of the present invention.Such as Fig. 3 and Fig. 4 institute
Show, a kind of suppressing method 300 of single-phase grid-connected inverter output current harmonics includes:
Step 301, the voltage of the DC bus sampled is obtained into feedback signal V after signal processingdc, and and direct current
Bus a reference value VdcrefIt is compared to obtain DC bus error signal, grid-connected current magnitude references letter is obtained after PI is adjusted
Number I*；
Step 302, the grid-connected current magnitude reference I that will be obtained before*With the sine table by locking phase network voltage
Sin (ω t) is multiplied, and obtains grid-connected current reference signal igridref, the grid-connected current sampled is obtained after signal processing
Feedback signal igridWith grid-connected current reference signal igridrefIt is compared, obtains grid-connected current error signal, adjusted by PI
After obtain grid-connected current modulated signal；
Step 303, in order to eliminate influence of the network voltage to control loop, by the grid-connected current modulated signal of acquisition and warp
Over-sampling treated mains voltage signal vgridIt is added and obtains the modulated signal with voltage feed-forward control；
Step 304, by the harmonic wave electricity of the reversed polarity obtained after modulated signal and sampling processing with voltage feed-forward control
Stream-ihIt is added, obtains final modulated signal vreg；
The final modulated signal v obtained by the suppressing method 300regIt is compared with triangular wave carrier, obtains SPWM's
Driving signal.
The suppressing method 300 of the single-phase grid-connected inverter output current harmonics of the present embodiment is traditional single-phase grid-connected inverse
Become on the basis of device control, grid-connected current harmonic component feed-forward signal is added, to eliminate the harmonic component in grid-connected current.With
Unlike harmonic suppressing method in another single-phase grid-connected inverter control block diagram in the prior art shown in Fig. 2, and
The reference signal of net electric current is still pure sine wave I** sin (ω t) ensures that grid-connected current is tracking fundamental wave just always in this way
String signal.Simultaneously on the basis of original modulating wave, the harmonic current-i of reversed polarity joinedh, so that final modulated signal
In the harmonic current-i containing base wave control signal and reversed polarityh, the harmonic current i of reversed polarityhFor generating the harmonic wave electricity of reverse phase
For stream to eliminate the harmonic component in original grid-connected current, base wave control signal guarantees that system generates the grid-connected electricity of fundamental wave of pure sinusoid
Stream.
In the suppressing method of single-phase grid-connected inverter output current harmonics, the harmonic current-i of reversed polarity is obtainedhStep
It suddenly include: grid-connected current sampling；Harmonic current i is calculatedh；To harmonic current ihCarry out reversed polarity processing.
Single-phase grid-connected current harmonics electric current in the present invention can be obtained with reference to following method:
General grid-connected transient current i can be decomposed into i (t)=if(t)+ih(t)；
I in formulafIt (t) is instantaneous fundamental current, ihIt (t) is instantaneous harmonic current；
if(t) i can be further broken intof(t)=ip(t)+iq(t)；
Wherein, ipIt (t) is instantaneous fundamental active current, iqIt (t) is instantaneous fundamental reactive current
So grid-connected transient current i can be decomposed into i (t)=ip(t)+iq(t)+ih(t)
From the above it can be seen that as long as we obtain instantaneous fundamental current if(t) or instantaneous fundamental active current ip(t) and it is instantaneous
Fundamental reactive current iq(t), the instantaneous harmonic current i in grid-connected current can be obtainedh(t)。
It after detecting harmonic current, needs to handle harmonic current with reversed polarity, the command signal as compensation electric current is used
To control inverter compensation harmonic electric current.As shown in figure 4, by harmonic current ihThe control for the former grid-connected current that is added to after reversed polarity
The control signal containing compensation harmonic is obtained in signal, compared with control signal carries out in real time with high frequency delta modulation wave again, gained
Control signal of the pwm signal arrived as each switch block of inverter.
Therefore, the harmonic current that real-time detection goes out in grid-connected current is the important prerequisite for realizing harmonics restraint.It can use
The method of following exemplary extracts harmonic current.
First method is direct extraction fundamental current method, uses low-pass filter, bandpass filter or bandreject filtering
Device is directly filtered grid-connected current, fundamental current (including fundamental active current and fundamental reactive current) is obtained, by going
Except the fundamental current in grid-connected current, harmonic current i is obtainedh。
Fig. 5 is current harmonics component detection control block diagram (one) of the invention.As shown in figure 5, using the band logical of 50/60Hz
The harmonic current observation circuit that filter and subtracter are constituted, removes the fundamental current i in grid-connected currentf, to obtain harmonic wave
Electric current ih.It should be understood that bandpass filter here can be substituted for low-pass filter or bandstop filter.Using directly mentioning
Take the circuit structure of fundamental current method simple, but precision is lower.
Second method is to be isolated from grid-connected current using three-phase circuit reactive power theory by linear transformation
Fundamental current, to obtain harmonic current ih。
In the case that three-phase instantaneous reactive power theory is built upon three-phase symmetrical, by linear transformation, fundamental wave is isolated
Component is widely used in three-phase circuit to achieve the purpose that detect idle and harmonic wave.The basic principle is that: it is logical
Coordinate transformation method mathematically is crossed, is the electricity in two-phase stationary coordinate system the current transformation in AC three-phase rest frame
Stream, then the current transformation in two-phase stationary coordinate system be two-phase rotating coordinate system in electric current.After coordinate transform, three-phase
Fundamental active component and fundamental reactive component in AC system are expressed as DC component in two-phase rotating coordinate system, and convert
Harmonic component in the corresponding former three-phase static coordinate system of the AC compounent of acquisition.So with three-phase circuit instantaneous reactive power reason
Based on, it can be obtained and calculate fundamental active current ipWith fundamental reactive current iqMethod.It may finally obtain three phase harmonic
Electric current iah、ibhAnd ich.Fig. 6 is current harmonics component detection control block diagram (two) of the invention.As shown, wherein uaFor a phase
Voltage, ia、ibAnd icRespectively a, b, c three-phase current, iα、iβFor by transformed two-phase stationary coordinate system system in electric current,
ip、iqFor by the electric current in transformed two-phase rotating coordinate system system, LPF is low-pass filter,For ip、iqIn it is straight
Flow component, iaf、ibfAnd icfFor the fundamental current in the three-phase current that is obtained after coordinate inverse transformation, iah、ibhAnd ichIt is three
Phase harmonic current.
According to the fundamental active current i of three-phase circuitpWith fundamental reactive current iqPrinciple, we can be to single-phase circuit
It is constructed, with the fundamental active current i of three-phase circuitpWith fundamental reactive current iq, fundamental wave electricity is removed from grid-connected current
Flow if, to obtain harmonic current ih。
The third method is that grid-connected current is configured to three-phase circuit using Theory of Instantaneous Reactive Power of Three-Phase Circuits, with
Obtain harmonic current ih。
According to the voltage of single-phase circuit, current flow configuration one similar three-phase system, i.e., applicable three-phase circuit instantaneous reactive
Power Theory.Fig. 7 is current harmonics component detection control block diagram (three) of the invention.As shown in fig. 7, going out from this basic conception
Hair, constructs single-phase grid-connected electric current, is delayed by T1/T2 and generates three-phase current, then uses three-phase circuit instantaneous reactive
Power reason is fallen, and is the electric current in two-phase stationary coordinate system the current transformation in AC three-phase rest frame, then two-phase is quiet
Only the current transformation in coordinate system is the electric current in two-phase rotating coordinate system, and low-pass filtered device obtains DC component, using
The i in three-phase current obtained after coordinate inverse transformationf, to obtain the harmonic current i in monophase currenth。
Fourth method is that grid-connected current is configured to orthogonal two using Theory of Instantaneous Reactive Power of Three-Phase Circuits
Circuitry phase, to obtain harmonic current.
It needs to constitute and be mutually perpendicular on α β plane first by three-phase current by coordinate transform in three-phase Instantaneous Power Theory
Two-phase, then can be directly by monophase current by 90 degree of the phase shift orthogonal two-phases of composition.Fig. 8 is electric current of the invention
Harmonic component detects control block diagram (four).As shown in figure 8, the current signal that will test is denoted as iα90 degree of phase delay obtain iβ,
Calculate ipAnd iqLater, DC form is had become in new coordinate system due to active power, as long as thus using low-pass filter
(LPF) it can be filtered off, therefore ipAnd iqIts DC component is obtained after LPFWithAndWithJust result from fundamental wave electricity
Stream, therefore can incite somebody to actionWithFrom α, switch back to come again in β coordinate system, to acquire fundametal compoment if.I is subtracted with ifJust obtain
Harmonic current ih.This method has preferable real relative to more being simplified by the method that phase shift constitutes three-phase current before
Shi Xing.
The suppressing method of single-phase grid-connected inverter output current harmonics provided by the invention can effectively remove single-phase grid-connected inverse
Become the output current harmonics of device.
Although the present invention is disclosed as above with preferred embodiment, it is not for limiting the present invention, any this field skill
Art personnel without departing from the spirit and scope of the present invention, can make possible variation and modification.Therefore, it is all without departing from
The content of technical solution of the present invention, according to the technical essence of the invention any modification to the above embodiments, equivalent variations
And modification, it each falls within the protection scope that the claims in the present invention are defined.
Claims (6)
1. the suppressing method of single-phase grid-connected inverter output current harmonics, comprising:
The voltage of the DC bus sampled is obtained into feedback signal V after signal processingdc, and with DC bus a reference value
VdcrefIt is compared to obtain DC bus error signal, grid-connected current magnitude reference I is obtained after PI is adjusted*；
By the grid-connected current magnitude reference I*It is mutually multiplied with the sine table sin (ω t) that is obtained after locking phase network voltage
To grid-connected current reference signal igridref, feedback signal i that the grid-connected current sampled is obtained after signal processinggridWith
The grid-connected current reference signal igridrefIt is compared, obtains grid-connected current error signal, obtained after PI is adjusted grid-connected
Current modulated；
By the grid-connected current modulated signal and the mains voltage signal v after sampling processinggridAddition is obtained with power grid electricity
Press the modulated signal of feedforward；
By the harmonic current-i of the reversed polarity obtained after the modulated signal and sampling processing with voltage feed-forward controlhIt is added,
To eliminate current harmonics, final modulated signal v is obtainedreg。
2. the suppressing method of single-phase grid-connected inverter output current harmonics according to claim 1, which is characterized in that obtain
Harmonic current-the i of the reversed polarityhThe step of include:
Grid-connected current sampling；
The harmonic current i is calculatedh；
To the harmonic current ihCarry out reversed polarity processing.
3. the suppressing method of single-phase grid-connected inverter output current harmonics according to claim 2, which is characterized in that use
Low-pass filter, bandpass filter or bandstop filter are filtered the grid-connected current, remove in the grid-connected current
Fundamental current obtains the harmonic current ih。
4. the suppressing method of single-phase grid-connected inverter output current harmonics according to claim 2, which is characterized in that application
Three-phase circuit reactive power theory isolates fundamental current from the grid-connected current by linear transformation, to obtain harmonic wave electricity
Flow ih。
5. the suppressing method of single-phase grid-connected inverter output current harmonics according to claim 2, which is characterized in that application
The grid-connected current is configured to three-phase circuit by Theory of Instantaneous Reactive Power of Three-Phase Circuits, to obtain harmonic current ih。
6. the suppressing method of single-phase grid-connected inverter output current harmonics according to claim 2, which is characterized in that application
The grid-connected current is configured to orthogonal two-phase circuit by Theory of Instantaneous Reactive Power of Three-Phase Circuits, to obtain harmonic wave electricity
Stream.
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| CN106532704B (en) * | 2016-12-20 | 2023-09-05 | 广州智光电气股份有限公司 | Energy storage current transformation system, current transformer and control method and controller of four-quadrant operation device |
| CN111624392B (en) * | 2020-07-20 | 2022-11-22 | 平顶山学院 | Method, device and equipment for detecting fundamental wave current of single-phase circuit |
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| CN102780232A (en) * | 2012-07-24 | 2012-11-14 | 华南理工大学 | Three-ring control method and three-ring control device of single-stage type photovoltaic grid-connected inverter system |
| CN103151783A (en) * | 2013-04-09 | 2013-06-12 | 马伏军 | Three-phase high-voltage cascading mixing power compensator and control method thereof |
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| CN102111084B (en) * | 2011-02-24 | 2013-01-23 | 江苏斯达工业科技有限公司 | Current waveform control method of single-phase DC-AC inverter and application thereof |
| CN102868309B (en) * | 2012-09-10 | 2014-11-19 | 中国石油大学(北京) | PWM (Pulse-Width Modulation) rectifier controlling method and PWM rectifier |
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| CN103151783A (en) * | 2013-04-09 | 2013-06-12 | 马伏军 | Three-phase high-voltage cascading mixing power compensator and control method thereof |
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