CN202261068U - Photovoltaic grid connected inverter having AC by-pass module - Google Patents
Photovoltaic grid connected inverter having AC by-pass module Download PDFInfo
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- CN202261068U CN202261068U CN2011200561760U CN201120056176U CN202261068U CN 202261068 U CN202261068 U CN 202261068U CN 2011200561760 U CN2011200561760 U CN 2011200561760U CN 201120056176 U CN201120056176 U CN 201120056176U CN 202261068 U CN202261068 U CN 202261068U
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- filter inductance
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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
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/53—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal
- H02M7/537—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters
- H02M7/5387—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration
- H02M7/5388—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode using devices of a triode or transistor type requiring continuous application of a control signal using semiconductor devices only, e.g. single switched pulse inverters in a bridge configuration with asymmetrical configuration of switches
-
- 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
- H02M1/123—Suppression of common mode voltage or current
-
- 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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
The utility model provides a photovoltaic grid connected inverter having an A by-pass module. The photovoltaic grid connected inverter having an A by-pass module includes a DC power source parallel circuit on an input terminal and an AC grid parallel circuit on an output terminal. The power source parallel circuit on the input terminal includes two parallel sub-circuits. The first sub-circuit is formed by a power source positive terminal, a first switch tube (S1), a six switch tube (S6), a third switch tube (S3) and a power source negative terminal together connected successively. The second sub-circuit is formed by the power source positive terminal, a second switch tube (S2), a fourth switch tube (S4) and a power source negative terminal together connected successively. The AC grid parallel circuit includes two parallel sub-circuits. The first sub-circuit is formed by a first filtering inductor (L1), an AC grid (vgrid), a second filtering inductor (L2), a fifth switch tube and a first diode (D1) together connected successively. The second sub-circuit is formed by the second filtering inductor (L2), the AC grid (vgrid), the first filtering inductor (L1), a sixth switch tube (S6) and a second diode (D2) together connected successively.
Description
Technical field
The utility model relates to dc-to-ac inverter, particularly relates to photovoltaic combining inverter, belongs to converters.
Background technology
Photovoltaic generation has sustainable development, environmental friendliness characteristics, on the reply energy and environmental crisis problem, has superiority.Usually the network-connecting generation inverter standard topology is four switching tube full bridge structures, through the power frequency isolating transformer or directly generate electricity by way of merging two or more grid systems.Because the power frequency isolating transformer has increased system cost, be unfavorable for bulking value optimization, and efficient is lower, thereby four switching tube full-bridge topologys is middle low power photovoltaic parallel in system preferred option.Be further optimization efficiency, the unipolarity chopping phase than bipolarity be modulated in the reality use more.But do not isolate photovoltaic generating system because photovoltaic panel takes up an area of bigger; There is bigger parasitic capacitance; And there is bigger common-mode voltage in the unipolarity chopping phase than the bipolarity modulation, is not having might cause under Industrial Frequency Transformer or the high frequency transformer isolated instances occurring bigger common mode current threat personal safety.
Summary of the invention
Technical problem: the purpose of the utility model is on the basis of the above-mentioned technology of research; The photovoltaic combining inverter that gang's band exchanges by-pass unit is proposed; Adopt the unipolarity modulation strategy; Isolate the high characteristics of four switching tube full-bridge inverter efficient simultaneously at reservation unipolarity modulation no industrial frequency transformer, common-mode voltage is less.
Technical scheme: gang's band that the utility model proposes exchanges the photovoltaic combining inverter of by-pass unit, comprises topology 1, topology 2, topology 3, topology 4 etc.,
1, wherein the topology 1 comprise with the input DC power parallel circuits and with the AC network parallel circuits,
A. described and input power supply parallel circuits comprise two parallel branches, and the order that article one branch road connects is: power positive end, first switching tube, the 6th switching tube, the 3rd switching tube, power supply negative terminal; The order that the second branch road connects is: power positive end, second switch pipe, the 4th switching tube, power supply negative terminal.
B. described and AC network parallel circuits comprise two parallel branches, and article one is propped up route first filter inductance, AC network, second filter inductance, the 5th switching tube, first diode and constituted; Second props up route second filter inductance, AC network, first filter inductance, the 6th switching tube, second diode formation.
A. during the positive half cycle of line voltage, the 5th switching tube is straight-through, and first switching tube, the 4th switching tube are with identical drive signal HF switch, and second switch pipe, the 6th switching tube, the 3rd switching tube turn-off; When first switching tube, the 4th switching tube conducting, the input power supply constitutes current supply circuit to mains supply through first switching tube, first filter inductance, AC network, second filter inductance, the 4th switching tube; When first switching tube, the shutoff of the 4th switching tube, grid-connected current constitutes continuous current circuit through the 5th switching tube, first diode, first filter inductance, AC network, second filter inductance and keeps grid-connected current.
B. during the line voltage negative half period, the 6th switching tube is straight-through, and second switch pipe, the 3rd switching tube are with identical drive signal HF switch, and first switching tube, the 5th switching tube, the 4th switching tube turn-off; When second switch pipe, the 3rd switching tube conducting, the input power supply constitutes current supply circuit to mains supply through second switch pipe, second filter inductance, AC network, first filter inductance, the 6th switching tube, the 3rd switching tube; When second switch pipe, the shutoff of the 3rd switching tube, grid-connected current constitutes continuous current circuit through the 6th switching tube, second diode, second filter inductance, AC network, first filter inductance and keeps grid-connected current.
2, wherein the topology 2 comprise with the input DC power parallel circuits and with the AC network parallel circuits,
A. described and input power supply parallel circuits comprise two parallel branches, and the order that article one branch road connects is: power positive end, first switching tube, the 3rd switching tube, power supply negative terminal; The order that the second branch road connects is: power positive end, the 6th switching tube, the 4th switching tube, power supply negative terminal.
B. described and AC network parallel circuits comprise two parallel branches, and article one is propped up route first filter inductance, AC network, second filter inductance, the 5th switching tube, first diode and constituted; Second props up route second filter inductance, AC network, first filter inductance, second diode, the 6th switching tube formation.
A. during the positive half cycle of line voltage, the 5th switching tube is straight-through, and first switching tube, the 4th switching tube are with identical drive signal HF switch, and second switch pipe, the 6th switching tube, the 3rd switching tube turn-off; When first switching tube, the 4th switching tube conducting, the input power supply constitutes current supply circuit to mains supply through first switching tube, first filter inductance, AC network, second filter inductance, the 4th switching tube; When first switching tube, the shutoff of the 4th switching tube, grid-connected current constitutes continuous current circuit through the 5th switching tube, first diode, first filter inductance, AC network, second filter inductance and keeps grid-connected current.
B. during the line voltage negative half period, the 6th switching tube is straight-through, and second switch pipe, the 3rd switching tube are with identical drive signal HF switch, and first switching tube, the 5th switching tube, the 4th switching tube turn-off; When second switch pipe, the 3rd switching tube conducting, the input power supply constitutes current supply circuit to mains supply through second switch pipe, the 6th switching tube, second filter inductance, AC network, first filter inductance, the 3rd switching tube; When second switch pipe, the shutoff of the 3rd switching tube, grid-connected current constitutes continuous current circuit through the 6th switching tube, second filter inductance, AC network, first filter inductance, second diode and keeps grid-connected current.
3, wherein the topology 3 comprise with the input DC power parallel circuits and with the AC network parallel circuits,
A. described and input power supply parallel circuits comprise two parallel branches, and the order that article one branch road connects is:
Power positive end, first switching tube, the 3rd switching tube, power supply negative terminal; The order that the second branch road connects is: power positive end, second switch pipe, the 5th switching tube, the 4th switching tube, power supply negative terminal.
B. described and AC network parallel circuits comprise two parallel branches, and article one is propped up route second filter inductance, AC network, first filter inductance, second diode, the 6th switching tube and constituted; Second props up route first filter inductance, AC network, second filter inductance, the 5th switching tube, first diode formation.
A. during the positive half cycle of line voltage, the 5th switching tube is straight-through, and first switching tube, the 4th switching tube are with identical drive signal HF switch, and second switch pipe, the 6th switching tube, the 3rd switching tube turn-off; When first switching tube, the 4th switching tube conducting, the input power supply constitutes current supply circuit to mains supply through first switching tube, first filter inductance, AC network, second filter inductance, the 5th switching tube, the 4th switching tube; When first switching tube, the shutoff of the 4th switching tube, grid-connected current constitutes continuous current circuit through the 5th switching tube, first diode, first filter inductance, AC network, second filter inductance and keeps grid-connected current.
B. during the line voltage negative half period, the 6th switching tube is straight-through, and second switch pipe, the 3rd switching tube are with identical drive signal HF switch, and first switching tube, the 5th switching tube, the 4th switching tube turn-off; When second switch pipe, the 3rd switching tube conducting, the input power supply constitutes current supply circuit to mains supply through second switch pipe, second filter inductance, AC network, first filter inductance, the 3rd switching tube; When second switch pipe, the shutoff of the 3rd switching tube, grid-connected current constitutes continuous current circuit through the 6th switching tube, second filter inductance, AC network, first filter inductance, second diode and keeps grid-connected current.
4, wherein the topology 4 comprise with the input DC power parallel circuits and with the AC network parallel circuits,
A. described and input power supply parallel circuits comprise two parallel branches, and the order that article one branch road connects is: power positive end, first switching tube, the 5th switching tube, the 3rd switching tube, power supply negative terminal; The order that the second branch road connects is: power positive end, second switch pipe, the 4th switching tube, power supply negative terminal.
B. described and AC network parallel circuits comprise two parallel branches, and article one is propped up route second filter inductance, AC network, first filter inductance, second diode, the 6th switching tube and constituted; Second props up route first filter inductance, AC network, second filter inductance, first diode, the 5th switching tube formation.
Topology 4 control methods are described below,
A. during the positive half cycle of line voltage, the 5th switching tube is straight-through, and first switching tube, the 4th switching tube are with identical drive signal HF switch, and second switch pipe, the 6th switching tube, the 3rd switching tube turn-off; When first switching tube, the 4th switching tube conducting, the input power supply constitutes current supply circuit to mains supply through first switching tube, the 5th switching tube, first filter inductance, AC network, second filter inductance, the 4th switching tube; When first switching tube, the shutoff of the 4th switching tube, grid-connected current constitutes continuous current circuit through the 5th switching tube, first filter inductance, AC network, second filter inductance, first diode and keeps grid-connected current.
B. during the line voltage negative half period, the 6th switching tube is straight-through, and second switch pipe, the 3rd switching tube are with identical drive signal HF switch, and first switching tube, the 5th switching tube, the 4th switching tube turn-off; When second switch pipe, the 3rd switching tube conducting, the input power supply constitutes current supply circuit to mains supply through second switch pipe, second filter inductance, AC network, first filter inductance, the 3rd switching tube; When second switch pipe, the shutoff of the 3rd switching tube, grid-connected current constitutes continuous current circuit through the 6th switching tube, second filter inductance, AC network, first filter inductance, second diode and keeps grid-connected current.
Beneficial effect: the utility model discloses gang's band and exchange by-pass unit, comprise containing six switching tubes, two diodes, 4 kinds of topologys of two output inductor combinations.Cooperate its control method, the present invention avoids the use of the switching tube body diode, has realized under the parallel network power generation transless isolated instances high efficiency, the active parallel network reverse of leakage current problem.
Description of drawings
Fig. 1 exchanges photovoltaic combining inverter topology 1 structural representation of by-pass unit for the band that the utility model proposed.
Fig. 2 exchanges photovoltaic combining inverter topology 2 structural representations of by-pass unit for the band that the utility model proposed.
Fig. 3 exchanges photovoltaic combining inverter topology 3 structural representations of by-pass unit for the band that the utility model proposed.
Fig. 4 exchanges photovoltaic combining inverter topology 4 structural representations of by-pass unit for the band that the utility model proposed.
Fig. 5 is each switching tube drive signal, synchronization AC voltage, inductance L for the topology 1 control method sketch map of band interchange by-pass unit from top to bottom successively
1Electric current (being grid-connected current).
Fig. 6 is for band exchanges topology 1 common-mode voltage, the common mode current waveform of by-pass unit, is the brachium pontis output voltage from top to bottom successively to dc bus negative terminal common-mode voltage, dc bus negative terminal common-mode voltage, common mode current over the ground.
Have among the above figure: the first switching tube S
1, second switch pipe S
2, the 3rd switching tube S
3, the 4th switching tube S
4, the 5th switching tube S
5, the 6th switching tube S
6, the first filter inductance L
1, the second filter inductance L
2, AC network
v Grid, the first diode D
1, the second diode D
2
Embodiment
Below in conjunction with embodiment, be example with topology 1, the contrast accompanying drawing is described further the present invention.
Fig. 1 by the utility model proposition band exchange the topology 1 of by-pass unit, comprise with the input DC power parallel circuits and with the AC network parallel circuits.With input power supply parallel circuits, comprise two parallel branches, the order that article one branch road connects is: power positive end, first switching tube, the 6th switching tube, the 3rd switching tube, power supply negative terminal; The order that the second branch road connects is: power positive end, second switch pipe, the 4th switching tube, power supply negative terminal.With the AC network parallel circuits, comprise two parallel branches, article one is propped up route first filter inductance, AC network, second filter inductance, the 5th switching tube, first diode formation; Second props up route second filter inductance, AC network, first filter inductance, the 6th switching tube, second diode formation.
During the positive half cycle of line voltage, the 5th switching tube is straight-through, and first switching tube, the 4th switching tube are with identical driving
The signal HF switch, second switch pipe, the 6th switching tube, the 3rd switching tube turn-off; When first switching tube, the 4th switching tube conducting, the input power supply constitutes current supply circuit to mains supply through first switching tube, first filter inductance, AC network, second filter inductance, the 4th switching tube; When first switching tube, the shutoff of the 4th switching tube, grid-connected current constitutes continuous current circuit through the 5th switching tube, first diode, first filter inductance, AC network, second filter inductance and keeps grid-connected current.
During the line voltage negative half period, the 6th switching tube is straight-through, and second switch pipe, the 3rd switching tube are with identical drive signal HF switch, and first switching tube, the 5th switching tube, the 4th switching tube turn-off; When second switch pipe, the 3rd switching tube conducting, the input power supply constitutes current supply circuit to mains supply through second switch pipe, second filter inductance, AC network, first filter inductance, the 6th switching tube, the 3rd switching tube; When second switch pipe, the shutoff of the 3rd switching tube, grid-connected current constitutes continuous current circuit through the 6th switching tube, second diode, second filter inductance, AC network, first filter inductance and keeps grid-connected current.
Fig. 2 is each switching tube drive signal, synchronization AC voltage, inductance L for the topology 1 control method sketch map of band interchange by-pass unit from top to bottom successively
1Electric current (being grid-connected current), in the time of can finding out the positive half cycle of electrical network, the 5th switching tube is often opened, the first, the 4th switching tube HF switch; The line voltage negative half period, the 6th switching tube is often opened, and second, third switching tube HF switch is typical unipolarity modulation strategy.
Fig. 3 is for band exchanges topology 1 common-mode voltage, the common mode current waveform of by-pass unit, is the brachium pontis output voltage from top to bottom successively to dc bus negative terminal common-mode voltage, dc bus negative terminal common-mode voltage, common mode current over the ground.Can find out that the brachium pontis output voltage is constant basically to dc bus negative terminal common-mode voltage at this moment; Dc bus negative terminal common-mode voltage over the ground is the low frequency component that superposes on the DC component basically; Thereby the common mode current of flowing through on the equivalent common mode capacitance Cpv is very little, far below 30mA effective value restriction in the standard.
Here importantly, through the first, the 3rd switching tube or the second, the 4th switching tube symmetrical distribution input supply voltage, the switching tube that preferably has identical characteristics thus.
Through additional first or second diode of continuous current circuit warp, avoid the relatively poor body diode use of characteristic in the full-bridge topology in addition, especially avoided its reverse-recovery problems, thereby converter has obtained greater efficiency.
Above content is to combine concrete preferred implementation to the further explain that the present invention did, and can not assert that the practical implementation of this aspect is only limited to these explanations.Under the present invention the those of ordinary skill of technical field; Under the prerequisite that does not break away from the present invention's design, make some alternative or obvious distortion that are equal to; And performance or purposes are identical; All should be regarded as belonging to protection scope of the present invention, for example output filter circuit also comprises and the electrical network shunt capacitance, or single inductor filter, LCL filter circuit; The 5th switching tube S in the by-pass unit
5, the first diode D
1Branch road and the 6th switching tube S
6, the second diode D
2Switching tube and diode transposition etc. in the branch road.
Claims (4)
1. one kind with the photovoltaic combining inverter that exchanges by-pass unit; It is characterized in that: topology 1; Comprise input DC power supply parallel circuits and output with the AC network parallel circuits; Described and input power supply parallel circuits comprise two parallel branches, and the order that article one branch road connects is: power positive end, the first switching tube (S
1), the 6th switching tube (S
6), the 3rd switching tube (S
3), power supply negative terminal; The order that the second branch road connects is: power positive end,
Second switch pipe (S
2), the 4th switching tube (S
4), power supply negative terminal;
Described and AC network parallel circuits comprise two parallel branches, and the order that article one branch road connects is: the first filter inductance (L
1), AC network (
v Grid), the second filter inductance (L
2), the 5th switching tube (S
5), the first diode (D
1); The order that the second branch road connects is: the second filter inductance (L
2), AC network (
v Grid), the first filter inductance (L
1), the 6th switching tube (S
6), the second diode (D
2).
2. band as claimed in claim 1 exchanges the photovoltaic combining inverter of by-pass unit, it is characterized in that: described and input power supply parallel circuits comprises two parallel branches, and the order that article one branch road connects is: power positive end, the first switching tube (S
1), the 3rd switching tube (S
3), power supply negative terminal; The order that the second branch road connects is: power positive end, the 6th switching tube, the 4th switching tube (S
4), power supply negative terminal;
With the AC network parallel circuits, comprise two parallel branches, article one branch road order of connection is: the first filter inductance (L
1), AC network (
v Grid), the second filter inductance (L
2), the 5th switching tube (S
5), the first diode (D
1); The second branch road order of connection is: the second filter inductance (L
2), AC network (
v Grid), the first filter inductance (L
1), the second diode (D
2), the 6th switching tube (S
6).
3. band as claimed in claim 1 exchanges the photovoltaic combining inverter of by-pass unit, it is characterized in that: described and input power supply parallel circuits comprises two parallel branches, and the order that article one branch road connects is: power positive end, the first switching tube (S
1), the 3rd switching tube (S
3), power supply negative terminal; The order that the second branch road connects is: power positive end, second switch pipe (S
2), the 5th switching tube (S
5), the 4th switching tube (S
4), power supply negative terminal;
With the AC network parallel circuits, comprise two parallel branches, article one branch road order of connection is: the second filter inductance (L
2), AC network (
v Grid), the first filter inductance (L
1), the second diode (D
2), the 6th switching tube; The second branch road order of connection is: the first filter inductance (L
1), AC network (
v Grid), the second filter inductance (L
2), the 5th switching tube (S
5), the first diode (D
1).
4. band as claimed in claim 1 exchanges the photovoltaic combining inverter of by-pass unit, it is characterized in that: described and input power supply parallel circuits comprises two parallel branches, and the order that article one branch road connects is: power positive end, the first switching tube (S
1), the 5th switching tube (S
5), the 3rd switching tube (S
3), power supply negative terminal; The order that the second branch road connects is: power positive end, second switch pipe (S
2), the 4th switching tube (S
4), power supply negative terminal;
With the AC network parallel circuits, comprise two parallel branches, article one branch road order of connection is: second filtering
Inductance (L
2), AC network (
v Grid), the first filter inductance (L
1), the second diode (D
2), the 6th switching tube (S
6) constitute; The second branch road order of connection is: the first filter inductance (L
1), AC network (
v Grid), the second filter inductance (L
2), the first diode (D
1), the 5th switching tube (S
5).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200561760U CN202261068U (en) | 2011-03-04 | 2011-03-04 | Photovoltaic grid connected inverter having AC by-pass module |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011200561760U CN202261068U (en) | 2011-03-04 | 2011-03-04 | Photovoltaic grid connected inverter having AC by-pass module |
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| Publication Number | Publication Date |
|---|---|
| CN202261068U true CN202261068U (en) | 2012-05-30 |
Family
ID=46122249
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|---|---|---|---|
| CN2011200561760U Expired - Fee Related CN202261068U (en) | 2011-03-04 | 2011-03-04 | Photovoltaic grid connected inverter having AC by-pass module |
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| Country | Link |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102163935A (en) * | 2011-03-04 | 2011-08-24 | 东南大学 | Photovoltaic grid-connected converter with alternating bypass unit |
-
2011
- 2011-03-04 CN CN2011200561760U patent/CN202261068U/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102163935A (en) * | 2011-03-04 | 2011-08-24 | 东南大学 | Photovoltaic grid-connected converter with alternating bypass unit |
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| GR01 | Patent grant | ||
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Granted publication date: 20120530 Termination date: 20170304 |
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| CF01 | Termination of patent right due to non-payment of annual fee |