CN100588105C - Inverse-excitation type single-stage inverter for interconnected photovoltaic power generation system - Google Patents
Inverse-excitation type single-stage inverter for interconnected photovoltaic power generation system Download PDFInfo
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- CN100588105C CN100588105C CN200810023804A CN200810023804A CN100588105C CN 100588105 C CN100588105 C CN 100588105C CN 200810023804 A CN200810023804 A CN 200810023804A CN 200810023804 A CN200810023804 A CN 200810023804A CN 100588105 C CN100588105 C CN 100588105C
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- China
- Prior art keywords
- power switch
- switch pipe
- side circuit
- inverse
- violent change
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention discloses an inverse-excitation type single-stage inverter used in an interconnected photovoltaic power generation system, including an input side circuit, an inverse-excitation transformer and an outlet side circuit, wherein, the input side circuit includes a photovoltaic array, a first filtering capacitance and a first power switch tube, which are connected to the primary side of the transformer; and the outlet side circuit includes a second to fifth power switch tube and a second filtering capacitance, which are connected to the secondary side of the transformer. The inventionhas the following advantages that the single-stage structure not only realizes voltage boosting inversion output, but also reduces the size, volume weight and cost of the complete machine; high-frequency electric insulation is realized; the entire circuit has no other magnetic components except the high-frequency inverse-excitation transformer, the entire circuit uses less power devices with simple structure and small spending; and the control scheme is more simple and is easy of implementing.
Description
One, technical field
The present invention relates to the inverter in a kind of transformation of electrical energy device, relate in particular to and a kind ofly can realize the boost inverter of inversion of single-stage.
Two, background technology
The application and the demand of outdoor grid-connected photovoltaic power generation are increasingly extensive, and for example projects such as " production and use of marsh gas system ", " photovoltaic insect pest early warning or deinsectization system " all need to use grid-connected photovoltaic power generation system in " Siyuan Project " of country's proposition recently.The price of photovoltaic system is still comparatively expensive at present, how to reduce its cost, under the prerequisite of guaranteed performance, for the poverty-stricken area provides inexpensive outdoor grid-connected photovoltaic power generation system, is that pendulum is comprising that enterprise is with the problem in face of the scientific worker of universities and colleges.The photovoltaic system inverter generally adopts the two-stage type structure at present.This is because mains system is output as 220VAC, then the DC side busbar voltage will reach 315VDC at least, and photovoltaic array output voltage representative value is far below 315VDC, thereby must increase one-level DC/DC straight convertor before inverter, input voltage boosted to the DC side busbar voltage of requirement.Relative single step arrangement, the two-stage type structure of DC/DC straight convertor+DC/AC inverter has increased system complexity, has increased machine volume weight, has reduced whole power conversion efficiency, has made overhead greatly increase.Thereby need obtain a kind of single-stage inverter of can realize boosting inversion and excellent performance.
Three, summary of the invention
The purpose of this invention is to provide a kind of can realize boosting inversion and simple and reliable single-stage inverter.
In order to solve the problem that occurs in the prior art, the present invention proposes a kind of technical scheme: the inverse-excitation type single-stage inverter that is used for grid-connected photovoltaic power generation system, comprise the input side circuit, anti-violent change depressor and outlet side circuit, the output of outlet side circuit is connected with extraneous load again, in the input side circuit, the anode of photovoltaic array links to each other with the anode of first electric capacity, link to each other with an end of the former limit of anti-violent change depressor winding simultaneously, the negative electrode of photovoltaic array links to each other with the negative electrode of first electric capacity, link to each other with the negative electrode of first power switch pipe simultaneously, the anode of first power switch pipe links to each other with the other end of the former limit of anti-violent change depressor winding; The negative electrode of second power switch pipe in one side of the anti-violent change depressor first cover secondary winding and the outlet side circuit links to each other, the negative electrode of the 3rd power switch pipe in the opposite side of the anti-violent change depressor first cover secondary winding and the outlet side circuit links to each other, the anode of the 4th power switch pipe in one side of the anti-violent change depressor second cover secondary winding and the outlet side circuit links to each other, and the anode of the 5th power switch pipe in the opposite side that anti-violent change depressor second overlaps the secondary winding and the outlet side circuit links to each other; In the outlet side circuit, the anode of second power switch pipe and the 5th power switch pipe negative electrode be connected in output, the anode of the 3rd power switch pipe and the 4th power switch pipe negative electrode be connected in another output, one side of second electric capacity is connected in output, and the other end is connected in another output.
The input side circuit of the inverse-excitation type single-stage inverter that the present invention adopts has comprised photovoltaic array and has produced input voltage, and first electric capacity carries out filtering and energy storage to the storage battery that adopts; It is consumer electronics equipment that its outlet side circuit connects load circuit; Its anti-violent change depressor that comprises works in the PWM modulation system, realized high frequency electrical isolation, no longer need inductance in the entire circuit, anti-violent change depressor secondary umber of turn is higher than former limit umber of turn, and the voltage (12～48VDC is optional) that input side circuit photovoltaic array is sent changes 320 required～360VDC of inversion into.Inverse-excitation type single-stage inverter has used five power switch pipes, wherein only first power switch pipe works in PWM high frequency modulated state, the waveform and the size that get final product control output voltage by the duty ratio of regulating first power switch pipe meet the demands, and control is simple and easy to realize; Second power switch pipe, the 3rd power switch pipe, the 4th power switch pipe and the 5th power switch pipe all work in the power frequency on-off mode, all a switch is once in the whole power frequency output cycle, working in output voltage, electric current respectively is quadrant in four quadrants of coordinate, this working method has reduced switching loss, and control is simple and easy to realize.
Beneficial effect: the present invention is a kind of inverse-excitation type single-stage inverter that is used for grid-connected photovoltaic power generation system, has following advantage: promptly realized the boosting inversion output of (1) single step arrangement, and complete machine size, volume weight and cost can greatly reduce; (2) realized high frequency electrical isolation; (3) entire circuit need not other magnetic spare except that high frequency flyback transformer, and entire circuit uses power device less, simple in structure, and expense is little; (4) controlling schemes is comparatively simple, is easy to realize; (5) four switching tubes of secondary need not to adopt the HF switch pipe, and the voltage stress of former limit switching tube is low, is the photovoltaic array output voltage, and the power device type selecting is convenient, need not to adopt expensive device.
Four, description of drawings
Fig. 1 is the inverse-excitation type single-stage inverter electrical block diagram that is used for grid-connected photovoltaic power generation system of the present invention, the label title: 1. input side circuit; 2. anti-violent change depressor; 3. outlet side circuit;
Fig. 2 is each switch mode schematic diagram of inverse-excitation type single-stage inverter that is used for grid-connected photovoltaic power generation system of the present invention;
Fig. 3 is the control block diagram that the inverse-excitation type single-stage inverter that is used for grid-connected photovoltaic power generation system of the present invention adopts.
Main designation among the figure: u
o---the inverter instantaneous output voltage.i
o---the inverter instantaneous output current is second capacitor C
2Electric current and user load electric current sum.V
1～V
5---power switch tube S
1～S
5Driving.
Five, embodiment
Below in conjunction with the drawings and specific embodiments the invention is described further:
As shown in Figure 1, the inverse-excitation type single-stage inverter of present embodiment is characterized in that, comprise input side circuit 1 and anti-violent change depressor 2 and outlet side circuit 3, the output of outlet side circuit is connected with extraneous load again, in the input side circuit 1, and the anode of photovoltaic array E and first capacitor C
1Anode link to each other, simultaneously and an end p of anti-violent change depressor 2 former limit windings
1Link to each other the negative electrode of photovoltaic array E and first capacitor C
1Negative electrode link to each other, simultaneously and first power switch tube S
1Negative electrode link to each other first power switch tube S
1Anode and the other end p of anti-violent change depressor 2 former limit windings
2Link to each other; One side n of anti-violent change depressor 2 first cover secondary windings
1Link to each other the opposite side n of anti-violent change depressor 2 first cover secondary windings with the negative electrode of second switch pipe S2 in the outlet side circuit 3
2With the 3rd power switch tube S in the outlet side circuit 3
3Negative electrode link to each other a side n of anti-violent change depressor 2 second cover secondary windings
3With the 4th power switch tube S in the outlet side circuit 3
4Anode link to each other the opposite side n of anti-violent change depressor 2 second cover secondary windings
4With the 5th power switch tube S in the outlet side circuit 3
5Anode link to each other; In the outlet side circuit 3, second power switch tube S
2Anode and the S of the 5th power switch pipe
5Negative electrode be connected in output o
2, the 3rd power switch tube S
3Anode and the S of the 4th power switch pipe
4Negative electrode be connected in another output o
1, second capacitor C
2A side be connected in output o
1, the other end is connected in another output o
2
Be main circuit structure below with Fig. 1, in conjunction with the accompanying drawings 2 and table 1 narrate the concrete operation principle and the operation mode of inverse-excitation type inverter of the present invention.
At output voltage u
o＞0, output current i
o＞0 o'clock, circuit comprised operation mode I and operation mode II:
1. operation mode I
Shown in Fig. 2 (a), first power switch tube S
1Conducting, the current i of anti-violent change depressor 2 former limit inductance L p
LPThe linear rising, anti-violent change depressor 2 secondary windings do not have electric current to pass through, and the converter output current is by second capacitor C
2Provide.
2. operation mode II
Shown in Fig. 2 (b), first power switch tube S
1Shutoff ends, and anti-violent change depressor 2 former limit inductive energy storages are from secondary n
1-n
2Winding discharges, second power switch tube S
2Conducting, output current i
o Anti-violent change depressor 2 secondary n flow through
1-n
2Winding, the 3rd power switch tube S
3Body diode, second power switch tube S
2
At output voltage u
o＞0, output current i
o＜0 o'clock, circuit comprised operation mode I and operation mode III:
3. operation mode III
Shown in Fig. 2 (c), first power switch tube S
1Shutoff ends, and anti-violent change depressor 2 former limit inductive energy storages are from secondary n
1-n
2Winding discharges, the 3rd power switch tube S
3Conducting, output current i
o Anti-violent change depressor 2 secondary n flow through
1-n
2Winding, second power switch tube S
2Body diode, the 3rd power switch tube S
3
At output voltage u
o＜0, output current i
o＞0 o'clock, circuit comprised operation mode I and operation mode IV:
4. operation mode IV
Shown in Fig. 2 (d), first power switch tube S
1Shutoff ends, and anti-violent change depressor 2 former limit inductive energy storages are from secondary n
3-n
4Winding discharges, the 4th power switch tube S
4Conducting, output current i
o Anti-violent change depressor 2 secondary n flow through
3-n
4Winding, the 4th power switch tube S
4, the 5th power switch tube S
5Body diode.
At output voltage u
o＜0, output current i
o＜0 o'clock, circuit comprised operation mode I and operation mode V:
5. operation mode V
Shown in Fig. 2 (e), first power switch tube S
1Shutoff ends, and anti-violent change depressor 2 former limit inductive energy storages are from secondary n
3-n
4Winding discharges, the 5th power switch tube S
5Conducting, output current i
o Anti-violent change depressor 2 secondary n flow through
3-n
4Winding, the 5th power switch tube S
5, the 4th power switch tube S
4Body diode.
The relation of the power tube switch combination state of table 1 inverse-excitation type inverter and output voltage, electric current
| u o | i o | S1 | S2 | S3 | S4 | S5 | Corresponding mode | Respective figure 2 |
| ＞0 | ＞0 | PWM | 1 | 0 | 0 | 0 | I、II | (a)、(b) |
| ＞0 | ＜0 | PWM | 0 | 1 | 0 | 0 | I、III | (a)、(c) |
| ＜0 | ＞0 | PWM | 0 | 0 | 1 | 0 | I、IV | (a)、(d) |
| ＜0 | ＜0 | PWM | 0 | 0 | 0 | 1 | I、V | (a)、(e) |
For realizing above operation principle, adopt controlling schemes as shown in Figure 3: output voltage and voltage reference obtain the PWM modulation signal through the Voltage loop computing, generate first power switch tube S through drive circuit
1Drive signal current benchmark V
1Detect output voltage u
oWith output current i
o, generate second～the 5th power switch tube S respectively through logical operation and drive circuit
2～S
5Drive signal, make output voltage u
o＞0, output current i
o＞0 first quartile, second power switch tube S
2Keep conducting, the 3rd power switch tube S
3, the 4th power switch tube S
4, the 5th power switch tube S
5End; Output voltage u
o＞0, output current i
o＜0 second quadrant, the 3rd power switch tube S
3Keep conducting, second power switch tube S
2, the 4th power switch tube S
4, the 5th power switch tube S
5End; Make output voltage u
o＜0, output current i
o＞0 four-quadrant, the 4th power switch tube S
4Keep conducting, second power switch tube S
2, the 3rd power switch tube S
3, the 5th power switch tube S
5End; Output voltage u
o＜0, output current i
o＜0 third quadrant, the 5th power switch tube S
5Keep conducting, second power switch tube S
2, the 3rd power switch tube S
3, the 4th power switch tube S
4End.
Though the utility model with preferred embodiment openly as above; but they are not to be used for limiting the utility model; anyly be familiar with this skill person; in the spirit and scope that do not break away from the utility model; can do various variations or retouching from working as, what therefore protection range of the present utility model should be defined with the application's claim protection range is as the criterion.
Claims (4)
1, a kind of inverse-excitation type single-stage inverter that is used for grid-connected photovoltaic power generation system, it is characterized in that, comprise input side circuit (1) and anti-violent change depressor (2) and outlet side circuit (3), the output of outlet side circuit is connected with extraneous load again, in the input side circuit (1), the anode of photovoltaic array (E) and the first electric capacity (C
1) anode link to each other, simultaneously and an end (p of the former limit of anti-violent change depressor (2) winding
1) link to each other the negative electrode of photovoltaic array (E) and the first electric capacity (C
1) negative electrode link to each other, simultaneously and the first power switch pipe (S
1) negative electrode link to each other the first power switch pipe (S
1) anode and the other end (p of the former limit of anti-violent change depressor (2) winding
2) link to each other; One side (n of anti-violent change depressor (2) first cover secondary windings
1) and outlet side circuit (3) in the second power switch pipe (S
2) negative electrode link to each other the opposite side (n of anti-violent change depressor (2) first cover secondary windings
2) and outlet side circuit (3) in the 3rd power switch pipe (S
3) negative electrode link to each other a side (n of anti-violent change depressor (2) second cover secondary windings
3) and outlet side circuit (3) in the 4th power switch pipe (S
4) anode link to each other the opposite side (n of anti-violent change depressor (2) second cover secondary windings
4) and outlet side circuit (3) in the 5th power switch pipe (S
5) anode link to each other; In the outlet side circuit (3), the second power switch pipe (S
2) anode and the (S of the 5th power switch pipe
5) negative electrode be connected in output (o
2), the 3rd power switch pipe (S
3) anode and the (S of the 4th power switch pipe
4) negative electrode be connected in another output (o
1), the second electric capacity (C
2) a side be connected in described another output (o
1), the other end is connected in described output (o
2).
2, inverse-excitation type single-stage inverter according to claim 1 is characterized in that, described input side circuit has comprised photovoltaic array and produced input voltage, and first electric capacity carries out filtering and energy storage to the storage battery that adopts; It is consumer electronics equipment that described outlet side circuit connects load circuit.
3, inverse-excitation type single-stage inverter according to claim 1, it is characterized in that, anti-violent change depressor works in the PWM modulation system, realized high frequency electrical isolation, no longer need inductance in the entire circuit, described anti-violent change depressor secondary umber of turn is higher than former limit umber of turn, and the voltage transition that described input side circuit photovoltaic array is sent is 320 required～360VDC of inversion.
4, inverse-excitation type single-stage inverter according to claim 3, it is characterized in that, first power switch pipe works in PWM high frequency modulated state, and second power switch pipe, the 3rd power switch pipe, the 4th power switch pipe and the 5th power switch pipe all work in the power frequency on-off mode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810023804A CN100588105C (en) | 2008-04-15 | 2008-04-15 | Inverse-excitation type single-stage inverter for interconnected photovoltaic power generation system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN200810023804A CN100588105C (en) | 2008-04-15 | 2008-04-15 | Inverse-excitation type single-stage inverter for interconnected photovoltaic power generation system |
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| Publication Number | Publication Date |
|---|---|
| CN101257263A CN101257263A (en) | 2008-09-03 |
| CN100588105C true CN100588105C (en) | 2010-02-03 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN200810023804A Expired - Fee Related CN100588105C (en) | 2008-04-15 | 2008-04-15 | Inverse-excitation type single-stage inverter for interconnected photovoltaic power generation system |
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Families Citing this family (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064713B (en) * | 2009-11-17 | 2013-01-16 | 上海英孚特电子技术有限公司 | High-efficiency flyback grid-connected photovoltaic inverter |
| CN102545670A (en) * | 2010-12-24 | 2012-07-04 | 章伟康 | Novel power-level topological structure of micro inverter |
| CN103840692A (en) * | 2012-11-27 | 2014-06-04 | 江苏绿扬电子仪器集团有限公司 | Flyback single-stage inverter for non-grid-connected photovoltaic power generation system |
| CN103560692A (en) * | 2013-11-07 | 2014-02-05 | 南京工业大学 | Output parallel forward flyback inverter |
| CN105226925B (en) * | 2015-11-02 | 2018-01-05 | 南京航空航天大学 | A kind of inverse-excitation type single-phase inverter and its control method |
| WO2018000349A1 (en) * | 2016-06-30 | 2018-01-04 | 周肇梅 | Photovoltaic inverter |
| CN113966032B (en) * | 2021-10-18 | 2023-11-21 | 河北科技大学 | Single-stage multipath LED driver based on flyback circuit |
-
2008
- 2008-04-15 CN CN200810023804A patent/CN100588105C/en not_active Expired - Fee Related
Non-Patent Citations (2)
| Title |
|---|
| 同步整流反激逆变器研究. 梁永春，孙林，龚春英，严仰光.中国电机工程学报，第26卷第6期. 2006 |
| 同步整流反激逆变器研究. 梁永春，孙林，龚春英，严仰光.中国电机工程学报，第26卷第6期. 2006 * |
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| CN101257263A (en) | 2008-09-03 |
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