CN102088193A - Photovoltaic synchronization grid full bridge six-switching tube inverter and control method thereof - Google Patents
Photovoltaic synchronization grid full bridge six-switching tube inverter and control method thereof Download PDFInfo
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- CN102088193A CN102088193A CN2011100527552A CN201110052755A CN102088193A CN 102088193 A CN102088193 A CN 102088193A CN 2011100527552 A CN2011100527552 A CN 2011100527552A CN 201110052755 A CN201110052755 A CN 201110052755A CN 102088193 A CN102088193 A CN 102088193A
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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
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Abstract
The invention relates to a photovoltaic synchronization grid full bridge six-switching tube inverter and a control method thereof, maintaining a high efficiency characteristic of a unipolar modulation power frequency transformer isolation free four-switching tube full-bridge inverter by utilizing a unipolar modulation strategy, simultaneously a common-mode voltage is small. The photovoltaic grid full-bridge inverter comprises a direct current power supply parallel circuit at an input end and an alternating current power supply parallel circuit at an output end; the direct current power supply parallel circuit at an input end comprises two parallel branches, the alternating current power supply parallel circuit at an output end comprises two parallel branches, when the switching tube for a high frequency operation is turned off under control, an inductance current flows through an additional diode branch, thereby efficiently inhibiting current leakage of the photovoltaic grid full-bridge inverter, simultaneously the inverter has the characteristic of high efficiency.
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, a kind of grid-connected six switching tube full-bridge inverter and control methods thereof are 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:A kind of six switching tube full-bridge inverters that the present invention proposes, comprise with the input DC power parallel circuits and with the AC network parallel circuits,
Grid-connected six switching tube full-bridge inverters of the present invention comprise the DC power supply parallel circuits of input and output with the AC network parallel circuits:
The DC power supply parallel circuits of described input comprises 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 6th switching tube, the 4th switching tube, power supply negative terminal;
Described AC network parallel circuits comprises two parallel branches, and the order that article one branch road connects is: first filter inductance, AC network, second filter inductance, first diode, the 5th switching tube; The order that the second branch road connects is: first filter inductance, AC network, second filter inductance, second diode, the 6th switching tube.
First switching tube, second switch pipe, the 3rd switching tube, the 4th switching tube, the 5th switching tube, the 6th switching tube
Be bipolar transistor, metal-oxide-semiconductor field effect t or insulated gate bipolar transistor.
The control method of grid-connected six switching tube full-bridge inverters of the present invention is:
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, 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.
Beneficial effect:The invention discloses a kind of six switching tube full-bridge inverters, comprise six switching tubes, two diodes, two output inductors.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 the six switching tube full-bridge inverter topologys that are incorporated into the power networks proposed by the invention.
When Fig. 2 was the positive half cycle of line voltage, during with the conducting of input power supply parallel branch switching tube, the input power supply was to electrical network transmission of power circuit, and wherein N point is that direct current is imported negative terminal, and the E point is the AC network zero line.
When Fig. 3 is the positive half cycle of line voltage, when turn-offing with input power supply parallel branch switching tube, the grid side freewheeling circuit.
Comprising: 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
6The first filter inductance L
1, the second filter inductance L
2AC network V
Grid, the first diode D
1, the second diode D
2
Fig. 4 is each switching tube drive signal, synchronization AC voltage, inductance L 1 electric current (being grid-connected current) for the six switching tube full-bridges topology work period control method schematic diagram that is incorporated into the power networks from top to bottom successively.
Fig. 5 is six switching tube full-bridges topologys common-mode voltage, common mode current waveform, 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.
Embodiment
Below in conjunction with embodiment and contrast accompanying drawing, the invention will be further described.
Fig. 1 is the six switching tube full-bridge topological circuits that are incorporated into the power networks proposed by the invention, 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 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 6th switching tube, 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, first diode, the 5th switching tube formation; Second props up route first filter inductance, AC network, second filter inductance, second diode, the 6th switching tube formation.
When Fig. 2,3 provides the positive half cycle of line voltage respectively, during with the conducting of input power supply parallel branch switching tube, when the input power supply turn-offs to electrical network transmission of power circuit and with input power supply parallel branch switching tube, the grid side freewheeling circuit.During the positive half cycle of line voltage, the 5th switching tube is straight-through, first switching tube, the 4th switching tube 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.
Similarly, during the line voltage negative half period, the 6th switching tube is straight-through, second switch pipe, the 3rd switching tube 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.
Fig. 4 is the six switching tube full-bridges topology work period control method schematic diagram that is incorporated into the power networks, be each switching tube drive signal, synchronization AC voltage, inductance L 1 electric current (being grid-connected current) from top to bottom successively, 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. 5 is six switching tube full-bridges topologys common-mode voltage, common mode current waveform, 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 H4 topology in addition, especially avoided its reverse-recovery problems, thereby converter has obtained greater efficiency.
The control method of grid-connected six switching tube full-bridge inverters of the present invention is:
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, 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.
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 etc.
Claims (3)
1. grid-connected six switching tube full-bridge inverters, comprise the DC power supply parallel circuits of input and output with the AC network parallel circuits, it is characterized in that:
The DC power supply parallel circuits of described input 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 6th switching tube (S
6), the 4th switching tube (S
4), power supply negative terminal;
Described AC network parallel circuits comprises 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 first diode (D
1), the 5th switching tube (S
5); The order that the second branch road connects is: the first filter inductance (L
1), AC network (V
Grid), the second filter inductance (L
2), the second diode (D
2), the 6th switching tube (S
6).
2. grid-connected six switching tube full-bridge inverters as claimed in claim 1 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.
3. the control method of grid-connected six switching tube full-bridge inverters as claimed in claim 1 is characterized in that this control method is:
A. during the positive half cycle of line voltage, the 5th switching tube (S
5) straight-through, the first switching tube (S
1), the 4th switching tube (S
4) with identical drive signal HF switch, second switch pipe (S
2), the 6th switching tube (S
6), the 3rd switching tube (S
3) turn-off; First switching tube (the S
1), the 4th switching tube (S
4) during conducting, the input power supply is through the first switching tube (S
1), the 5th switching tube (S
5), the first filter inductance (L
1), AC network (V
Grid), the second filter inductance (L
2), the 4th switching tube (S
4) constitute current supply circuit to mains supply; First switching tube (the S
1), the 4th switching tube (S
4) when turn-offing, grid-connected current is through the 5th switching tube (S
5), the first filter inductance (L
1), AC network (V
Grid), the second filter inductance (L
2), the first diode (D
1) constitute continuous current circuit and keep grid-connected current;
B. during the line voltage negative half period, the 6th switching tube (S
6) straight-through, second switch pipe (S
2), the 3rd switching tube (S
3) with identical drive signal HF switch, the first switching tube (S
1), the 5th switching tube (S
5), the 4th switching tube (S
4) turn-off; Second switch pipe (S
2), the 3rd switching tube (S
3) during conducting, the input power supply is through second switch pipe (S
2), the 6th switching tube (S
6), the second filter inductance (L
2), AC network (V
Grid), the first filter inductance (L
1), the 3rd switching tube (S
3) constitute current supply circuit to mains supply; Second switch pipe (S
2), the 3rd switching tube (S
3) when turn-offing, grid-connected current is through the 6th switching tube (S
6), the second filter inductance (L
2), AC network (V
Grid), the first filter inductance (L
1), the second diode (D
2) constitute continuous current circuit and keep grid-connected current.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100527552A CN102088193A (en) | 2011-03-04 | 2011-03-04 | Photovoltaic synchronization grid full bridge six-switching tube inverter and control method thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011100527552A CN102088193A (en) | 2011-03-04 | 2011-03-04 | Photovoltaic synchronization grid full bridge six-switching tube inverter and control method thereof |
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| Publication Number | Publication Date |
|---|---|
| CN102088193A true CN102088193A (en) | 2011-06-08 |
Family
ID=44099862
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2011100527552A Pending CN102088193A (en) | 2011-03-04 | 2011-03-04 | Photovoltaic synchronization grid full bridge six-switching tube inverter and control method thereof |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102244476A (en) * | 2011-07-13 | 2011-11-16 | 台达电子工业股份有限公司 | Inverter circuit |
| CN102255540A (en) * | 2011-07-06 | 2011-11-23 | 阳光电源股份有限公司 | Method, circuit and converter for converting DC voltage into AC voltage |
| CN102291032A (en) * | 2011-07-29 | 2011-12-21 | 阳光电源股份有限公司 | Inverter |
| CN102427303A (en) * | 2011-12-29 | 2012-04-25 | 阳光电源股份有限公司 | Single-phase inverter |
| CN103178734A (en) * | 2013-03-08 | 2013-06-26 | 沃太能源南通有限公司 | Photovoltaic inverter |
| CN103208935A (en) * | 2012-01-14 | 2013-07-17 | 牟英峰 | Low-common-mode-noise grid-connected inverter circuit and reactive power control method |
| US8885375B2 (en) | 2011-07-13 | 2014-11-11 | Delta Electronics, Inc. | Inverter for preventing leak current |
| US9148021B2 (en) | 2012-03-21 | 2015-09-29 | Industrial Technology Research Institute | Method for controlling alternating current output of photovoltaic device and alternating current photovoltaic device |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090103340A1 (en) * | 2007-10-19 | 2009-04-23 | Sma Solar Technology Ag | Inverter, more specifically for photovoltaic plants |
| CN101599713A (en) * | 2009-07-07 | 2009-12-09 | 华中科技大学 | A kind of three-level inverter of single-phase mixed bridge |
| CN101814856A (en) * | 2009-11-24 | 2010-08-25 | 南京航空航天大学 | Non-isolated grid-connected inverter and switch control time sequence thereof |
| CN102157955A (en) * | 2011-02-28 | 2011-08-17 | 特变电工新疆新能源股份有限公司 | Single-phase non-isolation type photovoltaic grid-connected inverter and control method |
| CN201994871U (en) * | 2011-03-04 | 2011-09-28 | 东南大学 | Photovoltaic grid six-switch tube bridge inverter |
-
2011
- 2011-03-04 CN CN2011100527552A patent/CN102088193A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20090103340A1 (en) * | 2007-10-19 | 2009-04-23 | Sma Solar Technology Ag | Inverter, more specifically for photovoltaic plants |
| CN101599713A (en) * | 2009-07-07 | 2009-12-09 | 华中科技大学 | A kind of three-level inverter of single-phase mixed bridge |
| CN101814856A (en) * | 2009-11-24 | 2010-08-25 | 南京航空航天大学 | Non-isolated grid-connected inverter and switch control time sequence thereof |
| CN102157955A (en) * | 2011-02-28 | 2011-08-17 | 特变电工新疆新能源股份有限公司 | Single-phase non-isolation type photovoltaic grid-connected inverter and control method |
| CN201994871U (en) * | 2011-03-04 | 2011-09-28 | 东南大学 | Photovoltaic grid six-switch tube bridge inverter |
Non-Patent Citations (3)
| Title |
|---|
| 《中国电机工程学报》 20110125 肖华锋 等 基于改进型全桥电路的非隔离光伏并网逆变器 第40-46页 1-3 第31卷, 第3期 * |
| 《太阳能学报》 20090930 张兴 等 单相非隔离型光伏并网系统中共模电流抑制的研究 1202-1208 1-3 第30卷, 第9期 * |
| 《电网技术》 20110131 杨秋霞 等 单相光伏并网系统共模电流分析 第180-185页 1-3 第35卷, 第1期 * |
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255540A (en) * | 2011-07-06 | 2011-11-23 | 阳光电源股份有限公司 | Method, circuit and converter for converting DC voltage into AC voltage |
| CN102255540B (en) * | 2011-07-06 | 2013-06-26 | 阳光电源股份有限公司 | Method, circuit and converter for converting DC voltage into AC voltage |
| CN102244476A (en) * | 2011-07-13 | 2011-11-16 | 台达电子工业股份有限公司 | Inverter circuit |
| CN102244476B (en) * | 2011-07-13 | 2013-11-27 | 台达电子工业股份有限公司 | Inverter circuit |
| US8885375B2 (en) | 2011-07-13 | 2014-11-11 | Delta Electronics, Inc. | Inverter for preventing leak current |
| CN102291032A (en) * | 2011-07-29 | 2011-12-21 | 阳光电源股份有限公司 | Inverter |
| CN102427303A (en) * | 2011-12-29 | 2012-04-25 | 阳光电源股份有限公司 | Single-phase inverter |
| CN103208935A (en) * | 2012-01-14 | 2013-07-17 | 牟英峰 | Low-common-mode-noise grid-connected inverter circuit and reactive power control method |
| US9148021B2 (en) | 2012-03-21 | 2015-09-29 | Industrial Technology Research Institute | Method for controlling alternating current output of photovoltaic device and alternating current photovoltaic device |
| CN103178734A (en) * | 2013-03-08 | 2013-06-26 | 沃太能源南通有限公司 | Photovoltaic inverter |
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Application publication date: 20110608 |