CN102163935A - Photovoltaic grid-connected converter with alternating bypass unit - Google Patents
Photovoltaic grid-connected converter with alternating bypass unit Download PDFInfo
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- CN102163935A CN102163935A CN2011100523496A CN201110052349A CN102163935A CN 102163935 A CN102163935 A CN 102163935A CN 2011100523496 A CN2011100523496 A CN 2011100523496A CN 201110052349 A CN201110052349 A CN 201110052349A CN 102163935 A CN102163935 A CN 102163935A
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
A photovoltaic grid-connected converter with an alternating bypass unit comprises a circuit in parallel connection with a direct-current power supply at an input end and a circuit in parallel connection with an alternating grid at an output end. The circuit in parallel connection with an input power supply comprises two parallel branches; the connection sequence of the first branch is as follows: a positive end of the power supply, a first switch tube (S1), a sixth switch tube (S6), a third switch tube (S3) and a negative end of the power supply; and the connection sequence of the second branch is as follows: the positive end of the power supply, a second switch tube (S2), a fourth switch tube (S4) and the negative end of the power supply. The circuit in parallel connection with the alternating grid comprises two parallel branches; the connection sequence of the first branch is as follows: a first filter inductor (L1), the alternating grid (vgrid), a second filter inductor (L2), a fifth switch tube (S5) and a first diode (D1); and the connection sequence of the second branch is as follows: the second filter inductor (L2), the alternating grid (vgrid), the first filter inductor (L1), the sixth switch tube (S6) and a second diode (D2).
Description
Technical field
The present invention relates to dc-to-ac inverter, particularly relate to photovoltaic combining inverter, belong to converters.
Background technology
Photovoltaic generation has sustainable development, environmental friendliness characteristics, has superiority on the reply energy and environmental crisis problem.Usually the network-connecting generation inverter standard topology is four switching tube full bridge structures, by 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 is used more than the bipolarity modulation in practice.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 objective of the invention 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 present invention 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.
Topology 2 control methods are as 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, 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 as 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 invention 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 using 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 is photovoltaic combining inverter topology 1 structural representation that band proposed by the invention exchanges by-pass unit.
Fig. 2 is photovoltaic combining inverter topology 2 structural representations that band proposed by the invention exchanges by-pass unit.
Fig. 3 is photovoltaic combining inverter topology 3 structural representations that band proposed by the invention exchanges by-pass unit.
Fig. 4 is photovoltaic combining inverter topology 4 structural representations that band proposed by the invention exchanges by-pass unit.
Fig. 5 is each switching tube drive signal, synchronization AC voltage, inductance L for the topology 1 control method schematic diagram 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, the invention will be further described.
Fig. 1 is the topology 1 that band proposed by the invention exchanges 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 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.
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 schematic diagram of band interchange by-pass unit from top to bottom successively
1Electric current (being grid-connected current), during the positive half cycle of electrical network, the 5th switching tube is often opened, the first, the 4th switching tube HF switch as can be seen; 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.This moment, the brachium pontis output voltage was constant substantially to dc bus negative terminal common-mode voltage as can be seen, dc bus negative terminal common-mode voltage over the ground is the low frequency component that superposes on the DC component substantially, 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, by 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.
By 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 be in conjunction with concrete preferred implementation to further describing that the present invention did, can not assert that the concrete enforcement of this aspect is only limited to these explanations.Concerning the general technical staff of the technical field of the invention, make some alternative or obvious distortion that are equal to without departing from the inventive concept of the premise, and performance or purposes are identical, all should be considered 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 (5)
1. a band exchanges the by-pass unit photovoltaic DC-to-AC converter, it is characterized in that: topology 1, comprise the DC power supply parallel circuits of input 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 by-pass unit photovoltaic DC-to-AC converter, 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 by-pass unit photovoltaic DC-to-AC converter, 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 by-pass unit photovoltaic DC-to-AC converter, 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).
5. exchange the by-pass unit photovoltaic DC-to-AC converter as claim 1,2,3 or 7 described bands, it is characterized in that 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) be bipolar transistor, metal-oxide-semiconductor field effect t or insulated gate bipolar transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100523496A CN102163935A (en) | 2011-03-04 | 2011-03-04 | Photovoltaic grid-connected converter with alternating bypass unit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100523496A CN102163935A (en) | 2011-03-04 | 2011-03-04 | Photovoltaic grid-connected converter with alternating bypass unit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN102163935A true CN102163935A (en) | 2011-08-24 |
Family
ID=44464956
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100523496A Pending CN102163935A (en) | 2011-03-04 | 2011-03-04 | Photovoltaic grid-connected converter with alternating bypass unit |
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Cited By (13)
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| CN102427312A (en) * | 2011-10-25 | 2012-04-25 | 阳光电源股份有限公司 | Single-phase inverter |
| CN102427311A (en) * | 2011-10-25 | 2012-04-25 | 阳光电源股份有限公司 | Single-phase inverter |
| CN102664543A (en) * | 2012-03-09 | 2012-09-12 | 深圳市汇川技术股份有限公司 | Full-bridge grid-connected inverter circuit and control method thereof |
| CN102739089A (en) * | 2012-06-28 | 2012-10-17 | 上海美科新能源股份有限公司 | High-efficiency transformer-free inverter circuit and control method |
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Application publication date: 20110824 |