CN106026727A - Single-phase photovoltaic power generation converter topology - Google Patents
Single-phase photovoltaic power generation converter topology Download PDFInfo
- Publication number
- CN106026727A CN106026727A CN201610415577.8A CN201610415577A CN106026727A CN 106026727 A CN106026727 A CN 106026727A CN 201610415577 A CN201610415577 A CN 201610415577A CN 106026727 A CN106026727 A CN 106026727A
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- China
- Prior art keywords
- branch road
- switching tube
- phase
- brachium pontis
- output
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Classifications
-
- 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
-
- 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
- H02M5/00—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases
- H02M5/02—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc
- H02M5/04—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters
- H02M5/22—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M5/275—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
- H02M5/293—Conversion of ac power input into ac power output, e.g. for change of voltage, for change of frequency, for change of number of phases without intermediate conversion into dc 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
-
- 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
- H02M1/0067—Converter structures employing plural converter units, other than for parallel operation of the units on a single load
- H02M1/007—Plural converter units in cascade
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
-
- 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 a single-phase photovoltaic power generation converter topology, belongs to the technical field of power electronic conversion, and mainly aims at solving the problems that output voltage of a household low-power photovoltaic power generation system cannot meet the grid connection requirements and the requirements of a local load on voltage in general. The single-phase photovoltaic power generation converter topology is mainly characterized by comprising a single-phase inverter and an AC-AC converter, wherein an output end of the single-phase inverter is connected with an input end of the AC-AC converter. DC power generated by photovoltaic modules is converted into AC power by the single-phase inverter; and the obtained AC power is boosted by the AC-AC converter and then is connected to a power grid or used by the local load. The single-phase photovoltaic power generation converter topology has the uniqueness that AC boosting is carried out after inversion, and the single-phase photovoltaic power generation converter topology is suitable for the application of relatively low DC voltage (relatively few photovoltaic modules are connected in series) generated by the photovoltaic modules.
Description
Technical field
The invention belongs to electric electronic current change technology field, be specifically related to a kind of single-phase photovoltaic generation unsteady flow topology.
Background technology
Power unsteady flow topology is that the electric energy that a kind of electrical power is converted to another electrical power processes circuit.In photovoltaic generating system, direct current energy produced by photovoltaic module is transformed into AC energy by general requirement, this function need to be realized by certain power unsteady flow topology, power unsteady flow topology usually DC-AC changer, DC-DC converter or the power circuit being made up of DC-DC converter and DC-AC changer.
For residents small-power photovoltaic generating system, photovoltaic module is few, and the DC voltage of generation is relatively low, if directly direct current energy relatively low for voltage being converted into AC energy, then alternating voltage is typically unsatisfactory for grid-connected requirement and the local load requirement to voltage.Direct current energy in order to be exported by photovoltaic module accesses electrical network or for local AC load after inversion, frequently with method be exchange side joint Industrial Frequency Transformer or raising DC voltage.If exchange side joint Industrial Frequency Transformer, then the power density causing photovoltaic converter system is low；If raising DC voltage, typically add one-level DC booster converter or the method using abundant photovoltaic module to connect at DC side.The present invention has then abandoned above two scheme, adds one-level AC-AC changer at AC and realizes boosting, to meet grid-connected voltage request or the local AC load requirement to voltage.
Summary of the invention
The purpose of the present invention is aiming at residents photovoltaic generating system and provides a kind of photovoltaic unsteady flow topology, is particularly suitable for the photovoltaic generating system that DC voltage input is relatively low.
The technical solution of the present invention is: a kind of single-phase photovoltaic generation unsteady flow topology, it is characterised in that: this unsteady flow topology is made up of single-phase inverter and AC-AC changer, and the outfan of single-phase inverter is connected with the input of AC-AC changer.
Single-phase inverter described in the technical solution of the present invention includes two switching tube compositions that the first capacitive branch, the first brachium pontis and second brachium pontis of parallel connection, the first brachium pontis and the second brachium pontis are connected by forward；Also include that the output branch road being made up of LC series circuit, the two ends of output branch road are connected on the intermediate connection point of the first brachium pontis and the second brachium pontis；Second electric capacity two ends of output branch road are inverter output end.
AC-AC changer described in the technical solution of the present invention includes the first branch road being made up of the switching tube of two Opposite direction connections, the second branch road being made up of switching tube and the 3rd capacitances in series of two Opposite direction connections, the first branch road and the second branch circuit parallel connection；3rd capacitance terminal of the second branch road is connected with the second electric capacity, is connected through the intermediate connection point of the second inductance with output branch road with the other end of the second branch road；3rd electric capacity two ends are AC-AC converter output terminal.
The input of the single-phase inverter described in the technical solution of the present invention terminates the first air switch；The output of AC-AC changer terminates the second air switch.
The present invention uses the single-phase photovoltaic generation unsteady flow topology being made up of single-phase inverter and AC-AC changer, wherein, single-phase inverter includes the first capacitive branch, the first brachium pontis and second brachium pontis of parallel connection, two switching tube compositions that first brachium pontis and the second brachium pontis are connected by forward, AC-AC changer includes the first branch road being made up of the switching tube of two Opposite direction connections, the second branch road being made up of switching tube and the 3rd capacitances in series of two Opposite direction connections, first branch road and the second branch circuit parallel connection, the outfan of inverter is connected with the input of AC-AC changer.In small-power photovoltaic generating system, even if the DC voltage that photovoltaic module produces is relatively low, after inverter and AC-AC changer process, the alternating voltage of output disclosure satisfy that grid-connected requirement and the local load requirement to voltage.In the present invention, the direct current energy that photovoltaic module produces is converted into AC energy by single-phase inverter, and AC-AC changer accesses electrical network or for local load again by after obtained AC energy boosting.The present invention is unique in that first inversion, then carries out AC boosting, is suitable for the application scenario of the DC voltage relatively low (less photovoltaic module series connection) that photovoltaic module produces.
Accompanying drawing explanation
Fig. 1 is the present invention single-phase photovoltaic generation unsteady flow topology.
Detailed description of the invention
The detailed description of the invention of the present invention is elaborated in conjunction with accompanying drawing.
The single-phase photovoltaic generation unsteady flow topology that the present invention proposes is as shown in Figure 1.Single-phase photovoltaic generation unsteady flow topology is made up of single-phase inverter and AC-AC changer, and the outfan of single-phase inverter is connected with the input of AC-AC changer.
Single-phase inverter includes the first capacitive branch, the first brachium pontis and second brachium pontis of parallel connection.First capacitive branch is made up of the first electric capacity Cin, and the positive pole of the first electric capacity Cin is connected to P1Point, the negative pole of the first electric capacity Cin is connected to P2Point.The first switching tube S that first brachium pontis is connected by forward1, second switch pipe S2Composition, the 3rd switching tube S that the second brachium pontis is connected by forward3, the 4th switching tube S4Composition, the first switching tube S1Emitter stage concatenation second switch pipe S2Colelctor electrode, the 3rd switching tube S3Emitter stage concatenation the 4th switching tube S4Colelctor electrode.Also include the output branch road being made up of LC series circuit, output route the first inductance L1, the second electric capacity Co be composed in series, the two ends of output branch road are connected to the intermediate connection point P of the first brachium pontis3Intermediate connection point P with the second brachium pontis4On.Second electric capacity Co two ends junction point P of output branch road5With P4For inverter output end.The input of single-phase inverter terminates the first air switch K1, the first air switch K1Binding post meet positive pole and the negative pole of photovoltaic module PV, the first air switch K 1., the most respectively1Binding post connect positive pole and the negative pole of the first electric capacity Cin 3., the most respectively.
AC-AC changer includes by the 5th switching tube S of two Opposite direction connections5, the 6th switching tube S6The first branch road constituted, by the 7th switching tube S of two Opposite direction connections7, the 8th switching tube S8And the 3rd electric capacity C1Second branch road in series, the first branch road and the second branch circuit parallel connection.Second inductance L2One end P6Meet the 5th switching tube S57th switching tube S of sum7Colelctor electrode, another terminates the end junction point P of the second electric capacity Co5.3rd electric capacity C of the second branch road1Outer end is connected with the second electric capacity Co, is connected through the intermediate connection point of the second inductance with output branch road with the other end of the second branch road；3rd electric capacity C1Two ends junction point P8With P7For AC-AC converter output terminal.5th switching tube S5Emitter stage concatenation the 6th switching tube S6Emitter stage, the 7th switching tube S7Emitter stage concatenation the 8th switching tube S8Emitter stage.The output of AC-AC changer terminates the second air switch K2, the second air switch K2Binding post meet P 1., the most respectively8Point and P7Point, the second air switch K2Binding post 3., 4. get access to grid.
The first switching tube S of the present invention1, second switch pipe S2, the 3rd switching tube S3, the 4th switching tube S4, the 5th switching tube S5, the 6th switching tube S6, the 7th switching tube S7With the 8th switching tube S8Gated transistor (IGBT) single-phase inverter is all used to include the first capacitive branch, the first brachium pontis and second brachium pontis of parallel connection.First capacitive branch is made up of the first electric capacity Cin, and the positive pole of the first electric capacity Cin is connected to P1Point, the negative pole of the first electric capacity Cin is connected to P2Point.The first switching tube S that first brachium pontis is connected by forward1, second switch pipe S2Composition, the 3rd switching tube S that the second brachium pontis is connected by forward3, the 4th switching tube S4Composition, the first switching tube S1Emitter stage concatenation second switch pipe S2Colelctor electrode, the 3rd switching tube S3Emitter stage concatenation the 4th switching tube S4Colelctor electrode.Also include the output branch road being made up of LC series circuit, output route the first inductance L1, the second electric capacity Co be composed in series, the two ends of output branch road are connected to the intermediate connection point P of the first brachium pontis3Intermediate connection point P with the second brachium pontis4On.Second electric capacity Co two ends junction point P of output branch road5With P4For inverter output end.The input of single-phase inverter terminates the first air switch K1, the first air switch K1Binding post meet positive pole and the negative pole of photovoltaic module PV, the first air switch K 1., the most respectively1Binding post connect positive pole and the negative pole of the first electric capacity Cin 3., the most respectively.
AC-AC changer includes by the 5th switching tube S of two Opposite direction connections5, the 6th switching tube S6The first branch road constituted, by the 7th switching tube S of two Opposite direction connections7, the 8th switching tube S8And the 3rd electric capacity C1Second branch road in series, the first branch road and the second branch circuit parallel connection.Second inductance L2One end P6Meet the 5th switching tube S57th switching tube S of sum7Colelctor electrode, another terminates the end junction point P of the second electric capacity Co5.3rd electric capacity C of the second branch road1Outer end is connected with the second electric capacity Co, is connected through the intermediate connection point of the second inductance with output branch road with the other end of the second branch road；3rd electric capacity C1Two ends junction point P8With P7For AC-AC converter output terminal.5th switching tube S5Emitter stage concatenation the 6th switching tube S6Emitter stage, the 7th switching tube S7Emitter stage concatenation the 8th switching tube S8Emitter stage.The output of AC-AC changer terminates the second air switch K2, the second air switch K2Binding post meet P 1., the most respectively8Point and P7Point, the second air switch K2Binding post 3., 4. get access to grid.
The first switching tube S of the present invention1, second switch pipe S2, the 3rd switching tube S3, the 4th switching tube S4, the 5th switching tube S5, the 6th switching tube S6, the 7th switching tube S7With the 8th switching tube S8All use gated transistor (IGBT).
Claims (5)
1. a single-phase photovoltaic generation unsteady flow topology, it is characterised in that: this unsteady flow topology is made up of single-phase inverter and AC-AC changer, and the outfan of single-phase inverter is connected with the input of AC-AC changer.
One the most according to claim 1 single-phase photovoltaic generation unsteady flow topology, it is characterized in that: described single-phase inverter includes two switching tube compositions that the first capacitive branch, the first brachium pontis and second brachium pontis of parallel connection, the first brachium pontis and the second brachium pontis are connected by forward；Also include that the output branch road being made up of LC series circuit, the two ends of output branch road are connected on the intermediate connection point of the first brachium pontis and the second brachium pontis；Second electric capacity two ends of output branch road are inverter output end.
One the most according to claim 1 and 2 single-phase photovoltaic generation unsteady flow topology, it is characterized in that: described AC-AC changer includes the first branch road being made up of the switching tube of two Opposite direction connections, the second branch road being made up of switching tube and the 3rd capacitances in series of two Opposite direction connections, the first branch road and the second branch circuit parallel connection；3rd capacitance terminal of the second branch road is connected with the second electric capacity, is connected through the intermediate connection point of the second inductance with output branch road with the other end of the second branch road；3rd electric capacity two ends are AC-AC converter output terminal.
One the most according to claim 3 single-phase photovoltaic generation unsteady flow topology, it is characterised in that: the input of described single-phase inverter terminates the first air switch (K1)；The output of AC-AC changer terminates the second air switch (K2).
5. the one single-phase photovoltaic generation unsteady flow topology stated according to claim 3, it is characterised in that: described switching tube is gated transistor.
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| CN201610415577.8A CN106026727A (en) | 2016-06-15 | 2016-06-15 | Single-phase photovoltaic power generation converter topology |
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| CN201610415577.8A CN106026727A (en) | 2016-06-15 | 2016-06-15 | Single-phase photovoltaic power generation converter topology |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2018107089A1 (en) * | 2016-12-09 | 2018-06-14 | North Carolina State University | Buck-boost power conversion system |
| CN112260561A (en) * | 2020-09-23 | 2021-01-22 | 北方工业大学 | Voltage support type boost conversion circuit and grid connection method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2018107089A1 (en) * | 2016-12-09 | 2018-06-14 | North Carolina State University | Buck-boost power conversion system |
| CN112260561A (en) * | 2020-09-23 | 2021-01-22 | 北方工业大学 | Voltage support type boost conversion circuit and grid connection method |
| CN112260561B (en) * | 2020-09-23 | 2022-06-10 | 北方工业大学 | Voltage support type boost conversion circuit and grid connection method |
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Application publication date: 20161012 |