CN105337482A - Suppression method for output current harmonic waves of single-phase grid-connected inverter - Google Patents
Suppression method for output current harmonic waves of single-phase grid-connected inverter Download PDFInfo
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- CN105337482A CN105337482A CN201510869737.1A CN201510869737A CN105337482A CN 105337482 A CN105337482 A CN 105337482A CN 201510869737 A CN201510869737 A CN 201510869737A CN 105337482 A CN105337482 A CN 105337482A
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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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Abstract
The invention provides a suppression method for output current harmonic waves of a single-phase grid-connected inverter. The suppression method comprises the steps that sampled voltage of a direct-current bus is subjected to signal processing to obtain a feedback signal Vdc, the feedback signal Vdc is compared with a reference value Vdcref of the direct-current bus to obtain a direct-current bus error signal, and a grid-connected current amplitude reference signal I* is obtained after PI regulation; the grid-connected current amplitude reference signal I* is multiplied by a sine table sin(omega t) of voltage passing across a phase-locked power grid to obtain a grid-connected current reference signal igridref, a feedback signal igrid obtained after signal processing is carried out on sampled grid-connected current is compared with the grid-connected current reference signal igridref to obtain a grid-connected current error signal, a grid-connected current modulating signal is obtained after PI regulation, a power grid voltage feedforward signal and reverse polar harmonic current -ih are added, and a final modulating signal vreg is obtained. By means of the suppression method for the output current harmonic waves of the single-phase grid-connected inverter, the output current harmonic waves of the single-phase grid-connected inverter can be effectively eliminated.
Description
Technical field
The present invention relates to the technical field of photovoltaic system, specifically, the present invention relates to a kind of suppressing method of single-phase grid-connected photovoltaic DC-to-AC converter output current harmonics.
Background technology
Along with the continuous increase of photovoltaic parallel in system installation amount, its output is also more and more obvious for the impact of power grid quality.The output current harmonics of photovoltaic DC-to-AC converter is the key factor affecting power grid quality, suppresses this factor to become an important requirement of photovoltaic DC-to-AC converter.
Fig. 1 is a kind of single-phase grid-connected inverter control block diagram of the prior art.As shown in the figure, in traditional scheme, due to PI (ProportionIntegration, proportional integral) control be used for AC system time, be have static difference to control, as can be seen from the figure, once in grid-connected current contain harmonic component, its final modulation signal v
regin must contain harmonic component, traditional single-phase grid-connected controller can not harmonic carcellation electric current.
Fig. 2 is another kind of single-phase grid-connected inverter control block diagram of the prior art.As shown in the figure, it is with harmonic suppression circuit, and in order to harmonic carcellation electric current, grid-connected current controller produces the harmonic current-i of reversed polarity
h, to offset the harmonic current in grid-connected current, compared to Figure 1 comparatively, add the harmonic component i of reversed polarity in grid-connected current benchmark link
h, to reach the harmonic component producing reversed polarity.But, when adding the harmonic current-i of reversed polarity
hafter, the reference current of grid-connected current just becomes I
** sin (ω t)-i
h, according to Theory of Automatic Control, the grid-connected current of output will follow the tracks of reference current, owing to containing harmonic component in reference current, then still contain harmonic current in grid-connected current.Therefore existing single-phase grid-connected band harmonic suppressing method still can not good harmonic carcellation electric current.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of suppressing method of single-phase grid-connected inverter output current harmonics, effectively can remove the output current harmonics of single-phase grid-connected inverter.
For solving the problems of the technologies described above, the suppressing method of a kind of single-phase grid-connected inverter output current harmonics provided by the invention, comprising:
The voltage of the described DC bus sampled is obtained feedback signal V after signal transacting
dcwith DC bus fiducial value V
dcrefcompare and obtain DC bus error signal, and obtain grid-connected current magnitude reference I after PI regulates
*;
By described grid-connected current magnitude reference I
*be multiplied with the sine table sin (ω t) through phase-locked line voltage and obtain grid-connected current reference signal i
gridref, by the feedback signal i that the grid-connected current sampled obtains after signal transacting
gridwith described grid-connected current reference signal i
gridrefcompare, obtain grid-connected current error signal, after PI regulates, obtain grid-connected current modulation signal;
By described grid-connected current modulation signal and the mains voltage signal v after sampling processing
gridbe added the modulation signal obtained with voltage feed-forward control;
By the reversed polarity harmonic current-i obtained after the described modulation signal with voltage feed-forward control and sampling processing
hbe added, obtain final modulation signal v
reg.
According to one embodiment of present invention, described reversed polarity harmonic current-i is obtained
hstep comprise:
Grid-connected current is sampled;
Calculate described harmonic current i
h;
To described harmonic current i
hcarry out reversed polarity process acquisition-i
h.
According to one embodiment of present invention, adopt low pass filter, band pass filter or band stop filter, filtering is carried out to described grid-connected current, removes the fundamental current in described grid-connected current, obtain described harmonic current i
h.
According to one embodiment of present invention, application three-phase circuit reactive power theory, by linear transformation, isolates fundamental current, to obtain harmonic current i from described grid-connected current
h.
According to one embodiment of present invention, application three-phase circuit instantaneous reactive power reason is fallen, and described grid-connected current is configured to three-phase circuit, to obtain harmonic current i
h.
According to one embodiment of present invention, application three-phase circuit instantaneous reactive power reason is fallen, and described grid-connected current is configured to orthogonal two-phase circuit, to obtain harmonic current.
The suppressing method of a kind of single-phase grid-connected inverter output current harmonics provided by the invention, effectively can remove the output current harmonics of single-phase grid-connected inverter.
Accompanying drawing explanation
The above and other features of the present invention, character and advantage become more obvious by passing through below in conjunction with the description of drawings and Examples, wherein:
Fig. 1 is a kind of single-phase grid-connected inverter control block diagram of the prior art;
Fig. 2 is another kind of single-phase grid-connected inverter control block diagram of the prior art;
Fig. 3 is the FB(flow block) of one embodiment of the present of invention;
Fig. 4 is signal transacting and the control flow chart of one embodiment of the present of invention;
Fig. 5 is current harmonics component detection control block diagram () of the present invention;
Fig. 6 is current harmonics component detection control block diagram (two) of the present invention;
Fig. 7 is current harmonics component detection control block diagram (three) of the present invention;
Fig. 8 is current harmonics component detection control block diagram (four) of the present invention.
Embodiment
Below in conjunction with specific embodiments and the drawings, the invention will be further described; set forth more details in the following description so that fully understand the present invention; but the present invention obviously can implement with multiple this alternate manner described that is different from; those skilled in the art can when doing similar popularization, deduction without prejudice to when intension of the present invention according to practical situations, therefore should with content constraints protection scope of the present invention of this specific embodiment.
Fig. 3 is the FB(flow block) of one embodiment of the invention; Fig. 4 is signal transacting and the control flow chart of one embodiment of the present of invention.It should be noted that these and follow-up other accompanying drawing all only exemplarily, it is not draw according to the condition of equal proportion, and should not be construed as limiting in this, as to the protection range of actual requirement of the present invention.As shown in Figure 3 and Figure 4, a kind of suppressing method 300 of single-phase grid-connected inverter output current harmonics comprises:
Step 301, obtains feedback signal V by the voltage of the DC bus sampled after signal transacting
dc, and with DC bus fiducial value V
dcrefcompare and obtain DC bus error signal, after PI regulates, obtain grid-connected current magnitude reference I
*;
Step 302, by the grid-connected current magnitude reference I obtained before
*be multiplied with the sine table sin (ω t) through phase-locked line voltage, obtain grid-connected current reference signal i
gridref, by the feedback signal i that the grid-connected current sampled obtains after signal transacting
gridwith grid-connected current reference signal i
gridrefcompare, obtain grid-connected current error signal, after PI regulates, obtain grid-connected current modulation signal;
Step 303, in order to eliminate the impact of line voltage on control loop, by the grid-connected current modulation signal and the mains voltage signal v after sampling processing that obtain
gridbe added the modulation signal obtained with voltage feed-forward control;
Step 304, by the harmonic current-i with the reversed polarity obtained after the modulation signal of voltage feed-forward control and sampling processing
hbe added, obtain final modulation signal v
reg;
By the final modulation signal v that this suppressing method 300 obtains
regcompare with triangular wave carrier, obtain the drive singal of SPWM.
The suppressing method 300 of the single-phase grid-connected inverter output current harmonics of the present embodiment is on the basis that traditional single-phase grid-connected inverter controls, and adds grid-connected current harmonic component feed-forward signal, in order to eliminate the harmonic component in grid-connected current.With the harmonic suppressing method in the of the prior art another kind of single-phase grid-connected inverter control block diagram shown in Fig. 2 unlike, the reference signal of grid-connected current remains pure sine wave I
** sin (ω t), this ensures that theres grid-connected current and follows the tracks of first-harmonic sinusoidal signal all the time.Simultaneously on the basis of original modulating wave, add the harmonic current-i of reversed polarity
h, to make the harmonic current-i containing first-harmonic control signal and reversed polarity in final modulation signal
h, the harmonic current i of reversed polarity
hbe used for producing anti-phase harmonic current to eliminate the harmonic component in original grid-connected current, first-harmonic control signal ensures that system produces the first-harmonic grid-connected current of pure sinusoid.
In the suppressing method of single-phase grid-connected inverter output current harmonics, obtain the harmonic current-i of reversed polarity
hstep comprise: grid-connected current sample; Calculate harmonic current i
h; To harmonic current i
hcarry out reversed polarity process.
Single-phase grid-connected current harmonics electric current in the present invention can obtain with reference to following method:
General grid-connected transient current i can be decomposed into i (t)=i
f(t)+i
h(t);
I in formula
ft () is instantaneous fundamental current, i
ht () is instantaneous harmonic current;
I
ft () can be decomposed into i further
f(t)=i
p(t)+i
q(t);
Wherein, i
pt () is instantaneous fundamental active current, i
qt () is instantaneous fundamental reactive current
So grid-connected transient current i can be decomposed into i (t)=i
p(t)+i
q(t)+i
h(t)
From the above, as long as we obtain instantaneous fundamental current i
f(t) or instantaneous fundamental active current i
p(t) and instantaneous fundamental reactive current i
qt (), just can obtain the instantaneous harmonic current i in grid-connected current
h(t).
After detecting harmonic current, need to harmonic current with reversed polarity process, as the command signal of offset current in order to control inverter compensation harmonic electric current.As shown in Figure 4, by harmonic current i
hobtain the control signal containing compensation harmonic in the control signal of the former grid-connected current that is added to after reversed polarity, control signal compares in real time with high frequency delta modulation ripple again, and the pwm signal obtained is as the control signal of each switch module of inverter.
Therefore, detect that the harmonic current in grid-connected current is the important prerequisite realizing harmonics restraint in real time.Following exemplary method can be adopted to extract harmonic current.
First method is extracting directly fundamental current method, it adopts low pass filter, band pass filter or band stop filter, directly filtering is carried out to grid-connected current, obtain fundamental current (comprising fundamental active current and fundamental reactive current), by removing the fundamental current in grid-connected current, obtain harmonic current i
h.
Fig. 5 is current harmonics component detection control block diagram () of the present invention.As shown in Figure 5, the harmonic current observation circuit adopting the band pass filter of 50/60Hz and subtracter to form, removes the fundamental current i in grid-connected current
f, thus obtain harmonic current i
h.Understandable, band pass filter here can replace to low pass filter or band stop filter.Adopt the circuit structure of extracting directly fundamental current method simple, but precision is lower.
Second method is application three-phase circuit reactive power theory, by linear transformation, from grid-connected current, isolates fundamental current, to obtain harmonic current i
h.
Three-phase instantaneous reactive power theory is when being based upon three-phase symmetrical, by linear transformation, isolates fundametal compoment, thus reaches the object detecting idle and harmonic wave, is widely used in three-phase circuit.Its general principle is: by mathematical coordinate transformation method, is the electric current in two-phase rest frame the current transformation in AC three-phase rest frame, then is the electric current in two-phase rotating coordinate system the current transformation in two-phase rest frame.After coordinate transform, the fundamental active component in three-phase alternating current system and fundamental reactive component are expressed as DC component in two-phase rotating coordinate system, and the harmonic component in the corresponding former three-phase static coordinate system of the alternating current component that conversion obtains.So, based on Theory of Instantaneous Reactive Power of Three-Phase Circuits, can obtain calculating fundamental active current i
pwith fundamental reactive current i
qmethod.Finally can obtain three phase harmonic current i
ah, i
bhand i
ch.Fig. 6 is current harmonics component detection control block diagram (two) of the present invention.As shown in the figure, wherein u
afor a phase voltage, i
a, i
band i
cbe respectively a, b, c three-phase current, i
α, i
βfor the electric current in the two-phase static coordinate system after conversion, i
p, i
qfor the electric current in the two-phase rotary coordinate system after conversion, LPF is low pass filter,
for i
p, i
qin DC component, i
af, i
bfand i
cffor the fundamental current in the three-phase current that obtains after coordinate inverse transformation, i
ah, i
bhand i
chfor three phase harmonic electric current.
According to the fundamental active current i of three-phase circuit
pwith fundamental reactive current i
qprinciple, we can construct single phase circuit, to use the fundamental active current i of three-phase circuit
pwith fundamental reactive current i
q, from grid-connected current, remove fundamental current i
f, thus obtain harmonic current i
h.
The third method is application Theory of Instantaneous Reactive Power of Three-Phase Circuits, grid-connected current is configured to three-phase circuit, to obtain harmonic current i
h.
According to voltage, current flow configuration similar three-phase system of single phase circuit, i.e. applicable Theory of Instantaneous Reactive Power of Three-Phase Circuits.Fig. 7 is current harmonics component detection control block diagram (three) of the present invention.As shown in Figure 7, from this basic conception, single-phase grid-connected electric current is constructed, three-phase current is produced by T1/T2 time delay, then adopt three-phase circuit instantaneous reactive power reason to fall, be the electric current in two-phase rest frame the current transformation in AC three-phase rest frame, then be the electric current in two-phase rotating coordinate system the current transformation in two-phase rest frame, DC component is obtained through low pass filter, then the i in the three-phase current obtained after coordinate inverse transformation
f, thus obtain the harmonic current i in monophase current
h.
4th kind of method is application Theory of Instantaneous Reactive Power of Three-Phase Circuits, grid-connected current is configured to orthogonal two-phase circuit, to obtain harmonic current.
Need in three-phase Instantaneous Power Theory first by three-phase current through coordinate transform, form orthogonal two-phase on α β plane, so can directly by monophase current through the orthogonal two-phase of phase shift 90 degree formation.Fig. 8 is current harmonics component detection control block diagram (four) of the present invention.As shown in Figure 8, the current signal detected is denoted as i
αphase delay 90 degree obtains i
β, calculate i
pand i
qafterwards, because active power becomes DC form in new coordinate system, as long as thus just can be leached with low pass filter (LPF), therefore i
pand i
qits DC component is obtained after LPF
with
and
with
just result from fundamental current, therefore can be by
with
from α, β coordinate system, conversion is returned again, thus tries to achieve fundametal compoment i
f.I is deducted with i
fjust obtain harmonic current i
h.This method, relative to more being simplified by the method for phase shift formation three-phase current before, has good real-time.
The suppressing method of single-phase grid-connected inverter output current harmonics provided by the invention, effectively can remove the output current harmonics of single-phase grid-connected inverter.
Although the present invention with preferred embodiment openly as above, it is not that any those skilled in the art without departing from the spirit and scope of the present invention, can make possible variation and amendment for limiting the present invention.Therefore, every content not departing from technical solution of the present invention, any amendment done above embodiment according to technical spirit of the present invention, equivalent variations and modification, all fall within protection range that the claims in the present invention define.
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 feedback signal V after signal transacting
dc, and with DC bus fiducial value V
dcrefcompare and obtain DC bus error signal, after PI regulates, obtain grid-connected current magnitude reference I
*;
By described grid-connected current magnitude reference I
*be multiplied with the sine table sin (ω t) through phase-locked line voltage and obtain grid-connected current reference signal i
gridref, by the feedback signal i that the grid-connected current sampled obtains after signal transacting
gridwith described grid-connected current reference signal i
gridrefcompare, obtain grid-connected current error signal, after PI regulates, obtain grid-connected current modulation signal;
By described grid-connected current modulation signal and the mains voltage signal v after sampling processing
gridbe added the modulation signal obtained with voltage feed-forward control;
By the harmonic current-i of reversed polarity obtained after the described modulation signal with voltage feed-forward control and sampling processing
hbe added, to eliminate current harmonics, obtain final modulation signal v
reg.
2. the suppressing method of single-phase grid-connected inverter output current harmonics according to claim 1, is characterized in that, obtains the harmonic current-i of described reversed polarity
hstep comprise:
Grid-connected current is sampled;
Calculate described harmonic current i
h;
To described harmonic current i
hcarry out reversed polarity process.
3. the suppressing method of single-phase grid-connected inverter output current harmonics according to claim 2, it is characterized in that, adopt low pass filter, band pass filter or band stop filter, filtering is carried out to described grid-connected current, remove the fundamental current in described grid-connected current, obtain described harmonic current i
h.
4. the suppressing method of single-phase grid-connected inverter output current harmonics according to claim 2, is characterized in that, application three-phase circuit reactive power theory, by linear transformation, isolates fundamental current, to obtain harmonic current i from described grid-connected current
h.
5. the suppressing method of single-phase grid-connected inverter output current harmonics according to claim 2, is characterized in that, application Theory of Instantaneous Reactive Power of Three-Phase Circuits, is configured to three-phase circuit by described grid-connected current, to obtain harmonic current i
h.
6. the suppressing method of single-phase grid-connected inverter output current harmonics according to claim 2, is characterized in that, application Theory of Instantaneous Reactive Power of Three-Phase Circuits, is configured to orthogonal two-phase circuit by described grid-connected current, to obtain harmonic current.
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| CN106532704A (en) * | 2016-12-20 | 2017-03-22 | 广州智光电气股份有限公司 | Energy storage conversion system and converter as well as control method and controller for four-quadrant runner |
| CN111624392A (en) * | 2020-07-20 | 2020-09-04 | 平顶山学院 | Method, device and equipment for detecting fundamental wave current of single-phase circuit |
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|---|---|
| CN105337482B (en) | 2018-12-14 |
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