CN104143930A - Micro photovoltaic inverter based on stagger cycle PWM - Google Patents
Micro photovoltaic inverter based on stagger cycle PWM Download PDFInfo
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- CN104143930A CN104143930A CN201310379070.8A CN201310379070A CN104143930A CN 104143930 A CN104143930 A CN 104143930A CN 201310379070 A CN201310379070 A CN 201310379070A CN 104143930 A CN104143930 A CN 104143930A
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- inverter
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention discloses a micro photovoltaic inverter based on stagger cycle PWM. The micro photovoltaic inverter based on stagger cycle PWM comprises a photovoltaic cell assembly, an anti-parallel diode, a DC-DC converter, a full-bridge inverter and a controller, wherein the controller is connected with the DC-DC converter and the full-bridge inverter, the stagger cycle PWM mode is adopted by the full-bridge inverter, and the stagger cycle PWM mode is a unipolar modulation mode. According to the two-stage micro photovoltaic inverter with the transformer isolation function, the isolation effect is achieved, the influence of photovoltaic fluctuation on a power grid is prevented, the design difficulty is reduced, and the efficiency is extremely high. Due to the fact that the stagger cycle PWM control method is adopted, loss of devices can be reduced, the overall efficiency is improved, and common mode interference of a micro inverter system can be reduced at the same time.
Description
Technical field
The present invention relates to photovoltaic DC-to-AC converter field, relate in particular to a kind of photovoltaic miniature inverter based on stagger cycle PWM modulation.
Background technology
Inverter claims again feed regulator isolator, purposes according to inverter in photovoltaic generating system can be divided into self power supply with and two kinds of grid-connected use, according to waveform modulated mode, can be divided into square-wave inverter, ladder inverter, sinewave inverter and Three-Phase Inverter again.For the inverter for grid-connected system, according to there being transless can be divided into transformer type inverter and inverter without transformer again.
Photovoltaic miniature inverter is the new research field of rising along with photovoltaic generation of electricity by new energy in recent years, photovoltaic miniature inverter research direction is mainly divided into transless isolated form and has transformer isolation type Miniature inverter two classes both at home and abroad, and wherein having transformer isolation type Miniature inverter is the main flow of research.Transless isolated form Miniature inverter, there is the high efficiency advantage of low-loss, but because the input voltage of photovoltaic battery panel is between 20V～50V, make it not have enough voltage gains to promote input voltage, can not be at high alternating voltage electrical network grid-connected or inverter efficiency is declined, without quarantine measures, make the reliability of inverter also not high simultaneously.And for having the Miniature inverter of transformer isolation, there is high voltage gain and electrical isolation, but its efficiency factor becomes the difficult point of its extensive use of restriction, so can the efficiency of isolated form Miniature inverter and reliability be its key technology that apply in industry.And existing two classes that mainly contain both at home and abroad in Miniature inverter circuit topology with transformer isolation a: class is with Flyback or isolation type Buck-Boost single stage type inverter, thereby its main feature is to adopt less switch to reduce switching loss, the long-life thin-film capacitor of the available high pressure low capacity of energy storage end substitutes the electrochemical capacitor in traditional low life-span, thereby improve the life-span of whole inverter, but its high frequency transformer design difficulty is large and using integral efficiency is not high.An other class is two-stage type, comprise DC-DC converter and high efficiency DC-AC inverter with transformer isolation, preceding stage DC-DC converter boosts by transformer isolation, also can adopt the mode of soft switch, have high efficiency and design of transformer is simple, rear class adopts full-bridge, half-bridge inverter, and control mode can adopt high-frequency PWM inversion or cycle inverting, the thing followed is complicated circuit structure, multiple control.
Summary of the invention
Problem for above-mentioned existence, the object of this invention is to provide a kind of photovoltaic miniature inverter based on stagger cycle PWM modulation, adopt DC-DC converter and the DC-AC inverter structure of two-stage type band transformer isolation, reduce design difficulty and promote using integral efficiency.
The object of the invention is to be achieved through the following technical solutions:
A kind of photovoltaic miniature inverter based on stagger cycle PWM modulation, wherein, comprise the photovoltaic cell component, anti-paralleled diode, DC-DC converter and the full-bridge inverter that connect successively, also comprise controller, described controller is connected with described DC-DC converter, described full-bridge inverter respectively, described full-bridge inverter adopts stagger cycle PWM modulation system, and described stagger cycle PWM modulation system is unipolarity modulation system.
The above-mentioned photovoltaic miniature inverter based on stagger cycle PWM modulation, wherein, described full-bridge inverter comprises four gate-controlled switch devices, the full-bridge type structure being comprised of input filter capacitor and inverter bridge.
The above-mentioned photovoltaic miniature inverter based on stagger cycle PWM modulation, wherein, four described gate-controlled switch devices include a power device and an anti-paralleled diode corresponding with described power device, and four described power devices form described inverter bridge.
The above-mentioned photovoltaic miniature inverter based on stagger cycle PWM modulation, wherein, described power device is NMOS pipe.
The above-mentioned photovoltaic miniature inverter based on stagger cycle PWM modulation, wherein, described stagger cycle PWM modulation system is power frequency period steamed bun ripple or high-frequency triangular wave.
The above-mentioned photovoltaic miniature inverter based on stagger cycle PWM modulation, wherein, the control sequential of two described gate-controlled switch devices in described full-bridge inverter on diagonal is simultaneously in operate condition or off state.
Compared with the prior art, beneficial effect of the present invention is:
The photovoltaic miniature inverter that adopts two-stage type band transformer isolation, has isolation effect, prevents the impact of photovoltaic fluctuation on electrical network, reduces design difficulty, also has very high efficiency.Adopt stagger cycle PWM control method can reduce device loss, improve whole efficiency, can reduce the common mode disturbances of micro-contrary inverter system simultaneously.
Accompanying drawing explanation
Fig. 1 is the structural representation block diagram that the present invention is based on the photovoltaic miniature inverter of stagger cycle PWM modulation;
Fig. 2 is the structural representation of full-bridge inverter that the present invention is based on the photovoltaic miniature inverter of stagger cycle PWM modulation;
Fig. 3 a, Fig. 3 b are respectively two kinds of stagger cycle PWM modulation systems that the present invention is based on the photovoltaic miniature inverter of stagger cycle PWM modulation;
Fig. 4 a, Fig. 4 b are respectively the two kinds of sequential charts that generate after ovennodulation that the present invention is based on the photovoltaic miniature inverter of stagger cycle PWM modulation.
Embodiment
Below in conjunction with schematic diagram and concrete operations embodiment, the invention will be further described.
As shown in Figure 1, the photovoltaic miniature inverter that the present invention is based on stagger cycle PWM modulation comprises photovoltaic cell component 1, anti-paralleled diode 2, DC-DC converter 3 and the full-bridge inverter 4 connecting successively, also comprise controller 6, controller 6 is connected with DC-DC converter 3, full-bridge inverter 4 respectively, and full-bridge inverter 4 is connected with outside by assembly output wiring terminal.Full-bridge inverter 4 adopts stagger cycle PWM modulation system 5, and stagger cycle PWM modulation system 5 is unipolarity modulation system, and in inversion system, than bipolarity modulation, unipolarity modulation harmonic component is little, is easy to eliminate, and switching loss is little.In addition, under unipolarity modulation system, common-mode voltage changes, and can produce common mode current.
Full-bridge inverter 4 comprises four gate-controlled switch devices 11,22,33,44, the full-bridge type structure being formed by input filter capacitor and inverter bridge, as depicted in figs. 1 and 2, four gate-controlled switch devices 11,22,33,44 include a power device and an anti-paralleled diode corresponding with power device, four power devices form inverter bridge, power device is herein preferably NMOS pipe, the source electrode of NMOS pipe is connected with the positive pole of anti-paralleled diode, and the drain electrode of NMOS pipe is connected with the negative pole of anti-paralleled diode.
Shown in Fig. 3 a and Fig. 3 b, stagger cycle PWM modulation system 5 is power frequency period steamed bun ripple (low frequency 50Hz) or high-frequency triangular wave.
In full-bridge inverter 4, the control sequential of each gate-controlled switch device 11,22,33,44 after stagger cycle PWM modulation is two kinds of patterns, as shown in Fig. 4 a and Fig. 4 b, the conduction mode of the corresponding gate-controlled switch device 11,22,33,44 of difference, it is to be noted, the control sequential of two gate-controlled switch devices in full-bridge inverter 4 on diagonal (11 and 44, or 22 and 33) is simultaneously in operate condition or off state.The first control model is referring to shown in Fig. 4 a, the control sequential of first gate-controlled switch device 11 is at the 4th gate-controlled switch device 44, within each clock cycle, to send impulse wave during in high level, impulse wave quantity in each concrete cycle is determined according to side circuit parameter, the 3rd gate-controlled switch device 33 is within each clock cycle, to send impulse wave during in high level at second gate-controlled switch device 22, and the impulse wave quantity in each concrete cycle is determined according to side circuit parameter.Continuation is as shown in Fig. 4 a, and second gate-controlled switch device 22 and the 4th gate-controlled switch device 44 are all continuous two clock cycle conductings, and then continuous two clock cycle turn-off; The second control model is referring to shown in Fig. 4 b, the control sequential of second gate-controlled switch device 11 is at the 3rd gate-controlled switch device 44, within each clock cycle, to send impulse wave during in high level, impulse wave quantity in each concrete cycle is determined according to side circuit parameter, the 4th gate-controlled switch device 33 is within each clock cycle, to send impulse wave during in high level at first gate-controlled switch device 22, and the impulse wave quantity in each concrete cycle is determined according to side circuit parameter.Continue as shown in Figure 4 b, first gate-controlled switch device 22 and the 3rd gate-controlled switch device 44 are all continuous two clock cycle conductings, and then continuous two clock cycle turn-off.
The present invention adopts the photovoltaic miniature inverter of two-stage type band transformer isolation, has isolation effect, prevents the impact of photovoltaic fluctuation on electrical network, reduces design difficulty, also has very high efficiency.Adopt stagger cycle PWM control method can reduce device loss, improve whole efficiency, can reduce the common mode disturbances of micro-contrary inverter system simultaneously.
Above specific embodiments of the invention be have been described in detail, but the present invention is not restricted to specific embodiment described above, it is just as example.To those skilled in the art, any equivalent modifications and alternative also all among category of the present invention.Therefore, equalization conversion and the modification done without departing from the spirit and scope of the invention, all should contain within the scope of the invention.
Claims (6)
1. the photovoltaic miniature inverter based on stagger cycle PWM modulation, it is characterized in that, comprise the photovoltaic cell component (1), anti-paralleled diode (2), DC-DC converter (3) and the full-bridge inverter (4) that connect successively, also comprise controller (6), described controller (6) is connected with described DC-DC converter (3), described full-bridge inverter (4) respectively, described full-bridge inverter (4) adopts stagger cycle PWM modulation system (5), and described stagger cycle PWM modulation system (5) is unipolarity modulation system.
2. the photovoltaic miniature inverter of modulating based on stagger cycle PWM according to claim 1, is characterized in that, described full-bridge inverter (4) comprises four gate-controlled switch devices (11; 22; 33; 44) the full-bridge type structure, being formed by input filter capacitor and inverter bridge.
3. the photovoltaic miniature inverter of modulating based on stagger cycle PWM according to claim 2, is characterized in that four described gate-controlled switch devices (11; 22; 33; 44) include a power device and an anti-paralleled diode corresponding with described power device, four described power devices form described inverter bridge.
4. the photovoltaic miniature inverter of modulating based on stagger cycle PWM according to claim 3, is characterized in that, described power device is NMOS pipe.
5. the photovoltaic miniature inverter of modulating based on stagger cycle PWM according to claim 4, is characterized in that, described stagger cycle PWM modulation system (5) is power frequency period steamed bun ripple or high-frequency triangular wave.
6. the photovoltaic miniature inverter of modulating based on stagger cycle PWM according to claim 5, it is characterized in that, the control sequential of two described gate-controlled switch devices in described full-bridge inverter (4) on diagonal is simultaneously in operate condition or off state.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106487251A (en) * | 2016-12-02 | 2017-03-08 | 许昌学院 | A kind of electrostatic dust-removing electrical source |
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| CN101841160A (en) * | 2009-03-19 | 2010-09-22 | 孔小明 | Grid-connection control method for solar photovoltaic power generation |
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| CN102005928A (en) * | 2010-12-06 | 2011-04-06 | 山东大学 | Photovoltaic high-frequency isolation boost soft switch DC/DC converter and control method thereof |
| CN102570830A (en) * | 2011-12-23 | 2012-07-11 | 上海电机学院 | Modular photovoltaic power electronic converter based on coupling inductance |
| CN203504448U (en) * | 2013-08-27 | 2014-03-26 | 慈溪市源顺光电科技有限公司 | Photovoltaic micro inverter based on staggered cycle PWM modulation |
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- 2013-08-27 CN CN201310379070.8A patent/CN104143930A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101841160A (en) * | 2009-03-19 | 2010-09-22 | 孔小明 | Grid-connection control method for solar photovoltaic power generation |
| CN101777775A (en) * | 2010-02-26 | 2010-07-14 | 东南大学 | High-frequency isolation single-phase photovoltaic grid-connected system and control method thereof |
| CN101951011A (en) * | 2010-08-25 | 2011-01-19 | 南京航空航天大学 | Solar photovoltaic and commercial power combined power supply system and control method thereof |
| CN102005928A (en) * | 2010-12-06 | 2011-04-06 | 山东大学 | Photovoltaic high-frequency isolation boost soft switch DC/DC converter and control method thereof |
| CN102570830A (en) * | 2011-12-23 | 2012-07-11 | 上海电机学院 | Modular photovoltaic power electronic converter based on coupling inductance |
| CN203504448U (en) * | 2013-08-27 | 2014-03-26 | 慈溪市源顺光电科技有限公司 | Photovoltaic micro inverter based on staggered cycle PWM modulation |
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| CN106487251A (en) * | 2016-12-02 | 2017-03-08 | 许昌学院 | A kind of electrostatic dust-removing electrical source |
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Application publication date: 20141112 |