CN101304221B - Solar photovoltaic interconnected inverter - Google Patents
Solar photovoltaic interconnected inverter Download PDFInfo
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- CN101304221B CN101304221B CN2008101226781A CN200810122678A CN101304221B CN 101304221 B CN101304221 B CN 101304221B CN 2008101226781 A CN2008101226781 A CN 2008101226781A CN 200810122678 A CN200810122678 A CN 200810122678A CN 101304221 B CN101304221 B CN 101304221B
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 230000005669 field effect Effects 0.000 claims description 13
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- 239000003990 capacitor Substances 0.000 claims description 3
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 239000013589 supplement Substances 0.000 abstract 1
- 239000000126 substance Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
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- 238000004891 communication Methods 0.000 description 2
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- 230000011712 cell development Effects 0.000 description 1
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- 238000001514 detection method Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
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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 solar energy photovoltaic parallel inverter, comprising a boost circuit, an inverter circuit and a filter circuit, wherein, the boost circuit and the inverter circuit are all electrically connected with a main control unit, and the boost circuit and the inverter circuit are coordinated and controlled through the main control unit; the boost circuit comprises a microprocessor, a boost circuit A and a boost circuit B; the boost circuit A is connected with the boost circuit B in parallel and a trigger pulse between the two circuits has half differences in switch period; the boost circuit carries out the dual-boost-circuit conversion control by the microprocessor; positive and negative ends of the boost circuit A are the positive and negative ends of a first power supply, the positive and negative ends of the boost circuit B are the positive and negative ends of a second power supply, the inverter circuit and a Q3, Q4 on the same bridge arm are alternatively on and off in a high frequency under the control of an inverter integrated chip, and the Q5 and the Q6 on the other bridge arm supplement with a Q3 bridge arm and a Q4 bridge arm after half period. The solar energy photovoltaic parallel inverter has the advantages of high overall efficiency and stable bus voltage.
Description
Technical field
The invention belongs to the solar photovoltaic technology field, specifically, relate to a kind of solar photovoltaic interconnected inverter.
Background technology
Along with conventional energy resource exhaustion, environmental problem are serious day by day, photovoltaic generation is very rapid as an emerging clean energy resource industry development, and annual amplification with 30% increases.Each country had all proposed solar energy development plan and accompanying policy separately in the last few years, 100,000,1,000,000 photovoltaic roof electricity generation systems of the U.S., Japan, Germany, France etc. " near ten year plan " that propose separately for example, in these system implementations, country all provides some financial supports, alleviates photovoltaic generation user's financial burden.These behaves of country have stimulated the develop rapidly of photovoltaic generation industry undoubtedly.Lifting along with development of Chinese economy and enhancement of environment dynamics, photovoltaic generation also is trend of the times promoting the use of of the whole nation, particularly domestic in recent years how tame large-scale solar cell development and production producer occurs enthusiastically, promoted the photovoltaic industry chain of China to form gradually, relevant national policy is also constantly put into effect and is perfect.
Photovoltaic combining inverter is the bridge that the solar cell generating is connected with electrical network, be one of equipment of photovoltaic power generation grid-connecting system user indispensability, mainly finish tracking, seizure line voltage and the frequency of the peak power output point of solar cell, make output current and line voltage with frequency homophase, isolated island effect prevention.Main functional modules generally comprises: prime voltage matches, maximum power point capture module, power factor adjustment module, electrical network detection, the inversion grid connection control module that has isolated island effect prevention, RS232, CAN, LCD demonstration etc.Overall combining inverter is divided into two kinds of isolated form and non-isolation types again.But general combining inverter exists shortcomings such as whole efficiency is not high enough, busbar voltage instability.
Summary of the invention
The objective of the invention is to overcome the deficiencies in the prior art, the solar photovoltaic interconnected inverter that a kind of whole efficiency is higher, busbar voltage is stable is provided.
The technical scheme that realizes above-mentioned purpose is: a kind of solar photovoltaic interconnected inverter, comprise booster circuit, inverter circuit and filter circuit, booster circuit is electrically connected with inverter circuit, inverter circuit is electrically connected with filter circuit, described inverter circuit adopts full-bridge type, by switching tube Q3, Q4, Q5, Q6 and peripheral circuit thereof constitute, described booster circuit is electrically connected with main control unit, inverter circuit is electrically connected with main control unit, and coordinate control by main control unit between booster circuit and the inverter circuit, the controller that described main control unit adopts is digital signal processor or single-chip microcomputer or other microprocessors, its improvement is: a, described booster circuit comprises microprocessor, booster circuit A and booster circuit B, trigger impulse mutual deviation 1/2nd switch periods of booster circuit A and two circuit in parallel with booster circuit B, booster circuit produce complementary pulse by microprocessor and carry out two booster circuit conversion controls; The positive-negative input end of b, described booster circuit A is the first power supply positive-negative input end, and the positive-negative input end of booster circuit B is the second source positive-negative input end, and MPPT maximum power point tracking (MPPT) control of two branch roads is carried out in the complementary work of two-way booster circuit respectively; C, described inverter circuit are under the control of inversion integrated chip, and the Q3 on the same brachium pontis, Q4 high frequency replace break-make, and the Q5 on another brachium pontis, Q6 worked with Q3, the complementation of Q4 brachium pontis after two/one-period.
One end of the inductance L 1 among the described booster circuit A connects the first power supply positive input terminal, the other end of inductance L 1 connects the end of field effect transistor Q1 and connects the anode of diode D1, the other end of field effect transistor Q1 connects the first power-input, and the negative terminal of diode D1 is connected with the input of inverter circuit; One end of the inductance L 2 among the described booster circuit B connects the second source positive input terminal, the other end of inductance L 2 connects the end of field effect transistor Q2 and connects the anode of diode D2, the other end of field effect transistor Q2 connects the second source negative input end, and the negative terminal of diode D2 is connected with the input of inverter circuit.
Described inverter circuit comprises switching tube Q3, Q4, Q5, Q6 and diode D3, D4, D5, D6, wherein diode D3 is in parallel with switching tube Q3, diode D4 is in parallel with switching tube Q4, diode D5 is in parallel with switching tube Q5, diode D6 is in parallel with switching tube Q6, and the parallel circuits of switching tube Q3 and diode D3 is with after the parallel circuits of switching tube Q4 and diode D4 is connected, again with by the parallel circuits of switching tube Q5 and diode D5 and circuit parallel connection after the parallel circuits of switching tube Q6 and diode D6 is connected.
Described filter circuit comprises inductance L 3, L4 and capacitor C, and the input of filter circuit is connected with the output of inverter circuit.
After the present invention adopts technique scheme, because the complementary work of two-way booster circuit, carry out MPPT maximum power point tracking (MPPT) control of two branch roads respectively, and when the solar grid-connected inverter DC input voitage was higher than certain value, booster circuit was not worked, thereby made that the whole efficiency of solar grid-connected inverter is higher, simultaneously, again because when booster circuit was worked, the complementation work of booster circuit can reduce the busbar voltage fluctuation, thereby busbar voltage is stable.
Description of drawings
Fig. 1 is the embodiments of the invention block diagram;
Fig. 2 is the embodiments of the invention theory diagram;
Fig. 3 is the embodiments of the invention circuit structure diagram;
Fig. 4 is the circuit diagram of booster circuit 1 of the present invention;
Fig. 5 is the manner of execution figure of the switching tube of booster circuit 1 of the present invention;
Fig. 6 is the Current Control schematic diagram of inverter circuit 2 of the present invention;
Fig. 7 is the configuration mode figure of the inverse switch pipe of inverter circuit 2.
Embodiment
Embodiment below in conjunction with accompanying drawing provides is described in further detail technology contents of the present invention.
With reference to Fig. 1,3,4, a kind of solar photovoltaic interconnected inverter, comprise booster circuit 1, inverter circuit 2 and filter circuit 3, booster circuit 1 is electrically connected with inverter circuit 2, inverter circuit 2 is electrically connected with filter circuit 3, described booster circuit 1 comprises microprocessor 1-1, booster circuit A and booster circuit B, trigger impulse mutual deviation 1/2nd switch periods of booster circuit A and two circuit in parallel with booster circuit B, booster circuit 1 produces complementary pulse by microprocessor 1-1 and carries out two booster circuit conversion controls, described inverter circuit 2 adopts full-bridge type, by switching tube Q3, Q4, Q5, Q6 and peripheral circuit thereof constitute, and under the control of inversion integrated chip 2-1, Q3 on the same brachium pontis, the Q4 high frequency replaces break-make, Q5 on another brachium pontis, Q6 after two/one-period with Q3, the complementary work of Q4 brachium pontis, described booster circuit 1 is electrically connected with main control unit 4, and inverter circuit 2 is electrically connected with main control unit 4, and coordinates control by main control unit 4 between booster circuit 1 and the inverter circuit 2.
When in use, booster circuit A input is received solar panel 1, and booster circuit B input is received solar panel 2, and filter circuit 3 outputs are connected to electrical network.Inversion integrated chip control inversion grid connection, main control unit carries out system coordination and realizes MPPT, LCD, communication and error protection etc.Microprocessor 1-1 in the booster circuit 1 can realize dual booster circuit DC/DC conversion control busbar voltage.Used microprocessor 1-1 is the TI2407 digital signal processor in the present embodiment, also can use 8XC196MC etc.
Referring to Fig. 3,4,5, one end of the inductance L 1 among the described booster circuit A connects the first power supply positive input terminal, the other end of inductance L 1 connects the end of field effect transistor Q1 and connects the anode of diode D1, the other end of field effect transistor Q1 connects the first power-input, and the negative terminal of diode D1 is connected with the input of inverter circuit 2; One end of the inductance L 2 among the described booster circuit B connects the second source positive input terminal, the other end of inductance L 2 connects the end of field effect transistor Q2 and connects the anode of diode D2, the other end of field effect transistor Q2 connects the second source negative input end, and the negative terminal of diode D2 is connected with the input of inverter circuit 2.
Control by microprocessor 1-1 referring to Fig. 2,3, prime DC/DC conversion.
Referring to Fig. 5, wherein DC/DC is two boosting inverter structures, and the relation of its input voltage and output voltage is identical with the relation of substance booster converter input voltage and output voltage.Two boosting inverters are that the substance booster circuit by two trigger impulse mutual deviation 1/2 switch periods composes in parallel, after the input voltage of two substance booster circuits is superimposed, the magnitude of voltage peak valley interlaces and synthetic more level and smooth input total voltage, the mean value of this voltage is 2 times of each substance booster circuit average voltage, the voltage harmonic frequency also is 2 times of substance booster circuit, yet the mains ripple amplitude but is reduced to 1/2 times of the substance booster circuit.This shows that dualization of booster circuit can reduce the harmonic wave of output voltage effectively, reduce the undulate quantity of DC bus-bar voltage, thereby busbar voltage is stable, thereby the harmonic wave that better reduces inverter output current for back level lays the foundation.Two-way separately can have two-way solar cell input carrying out respectively MPPT control (referring to Fig. 3), and when the solar grid-connected inverter DC input voitage is higher than certain value, booster circuit is not worked, make that the whole efficiency of solar grid-connected inverter is higher, two booster circuits in parallel simultaneously also can be standby each other, give birth to fault if wherein riches all the way, operation can be continued in another road, makes the reliability of solar grid-connected inverter be improved.
Referring to Fig. 6, described inverter circuit 2 comprises switching tube Q3, Q4, Q5, Q6 and diode D3, D4, D5, D6, wherein diode D3 is in parallel with switching tube Q3, diode D4 is in parallel with switching tube Q4, diode D5 is in parallel with switching tube Q5, diode D6 is in parallel with switching tube Q6, and the parallel circuits of switching tube Q3 and diode D3 is with after the parallel circuits of switching tube Q4 and diode D4 is connected, again with by the parallel circuits of switching tube Q5 and diode D5 and circuit parallel connection after the parallel circuits of switching tube Q6 and diode D6 is connected.
The control principle figure of DC/AC inversion as shown in Figure 6.The major function of DC/AC inversion is to make the electric current of output and line voltage with frequently, realizes unity power factor output, and the harmonic wave of electric current is less than 5% simultaneously, so the closed-loop control of electric current is the key link in the DC/AC conversion control.The transient current control that is based on voltage feed-forward control that the present invention adopts is realized by inversion integrated chip 2-1 control.The employed inversion integrated chip of present embodiment 2-1 is UC3854 or UC3855 or ML4821 or ML4822 etc.
Because the output current rate of change of bipolarity modulation is bigger, interference to external world is stronger, and four switching tube Q3, Q4, the omnidistance high frequency action of Q5, Q6 loss are big, so system has adopted the unipolarity modulation system.The unipolarity modulation has multiple switching tube action configuration mode, and upper and lower two power device high frequencies that general employing is a brachium pontis replace break-make, and another brachium pontis 50Hz complimentary action, this as can be known type of drive have two switching tubes to be in the high frequency operate condition.In order further to reduce switching loss, present embodiment adopts a kind of switching tube configuration mode of single tube high frequency action, and manner of execution is seen Fig. 7.
Referring to Fig. 3,6, described filter circuit 3 comprises inductance L 3, L4 and capacitor C.
Referring to Fig. 2,3, main control unit 4 is cores of system's control, carries out coordination, protection, communication and LCD demonstration etc. between DC/DC and the DC/AC.The controller that main control unit 4 adopts can also can use single-chip microcomputer MEG16 for single-chip microcomputer or other microprocessor for digital signal processor in the present embodiment.
Claims (4)
1. solar photovoltaic interconnected inverter, comprise booster circuit (1), inverter circuit (2) and filter circuit (3), booster circuit (1) is electrically connected with inverter circuit (2), inverter circuit (2) is electrically connected with filter circuit (3), described inverter circuit (2) adopts full-bridge type, by switching tube Q3, Q4, Q5, Q6 and peripheral circuit thereof constitute, described booster circuit (1) is electrically connected with main control unit (4), inverter circuit (2) is electrically connected with main control unit (4), and coordinate control by main control unit (4) between booster circuit (1) and the inverter circuit (2), the controller that described main control unit (4) adopts is digital signal processor or single-chip microcomputer or other microprocessors, it is characterized in that:
A, described booster circuit (1) comprise microprocessor (1-1), booster circuit A and booster circuit B, trigger impulse mutual deviation 1/2nd switch periods of booster circuit A and two circuit in parallel with booster circuit B, booster circuit (1) produce complementary pulse by microprocessor (1-1) and carry out two booster circuit conversion controls;
The positive-negative input end of b, described booster circuit A is the first power supply positive-negative input end, and the positive-negative input end of booster circuit B is the second source positive-negative input end, and MPPT maximum power point tracking (MPPT) control of two branch roads is carried out in the complementary work of two-way booster circuit respectively;
C, described inverter circuit (2) are under the control of inversion integrated chip (2-1), and the Q3 on the same brachium pontis, Q4 high frequency replace break-make, and the Q5 on another brachium pontis, Q6 worked with Q3, the complementation of Q4 brachium pontis after two/one-period.
2. solar photovoltaic interconnected inverter according to claim 1, it is characterized in that: an end of the inductance L 1 among the described booster circuit A connects the first power supply positive input terminal, the other end of inductance L 1 connects first end of field effect transistor Q1 and connects the anode of diode D1, second end of field effect transistor Q1 connects the first power-input, and the negative terminal of diode D1 is connected with the input of inverter circuit (2); One end of the inductance L 2 among the described booster circuit B connects the second source positive input terminal, the other end of inductance L 2 connects first end of field effect transistor Q2 and connects the anode of diode D2, second end of field effect transistor Q2 connects the second source negative input end, the negative terminal of diode D2 is connected with the input of inverter circuit (2), and the 3rd end of described field effect transistor Q1, Q2 all is connected to the microprocessor (1-1) of booster circuit (1).
3. solar photovoltaic interconnected inverter according to claim 1 and 2, it is characterized in that: described inverter circuit (2) comprises switching tube Q3, Q4, Q5, Q6 and diode D3, D4, D5, D6, wherein diode D3 is in parallel with switching tube Q3, diode D4 is in parallel with switching tube Q4, diode D5 is in parallel with switching tube Q5, diode D6 is in parallel with switching tube Q6, and the parallel circuits of switching tube Q3 and diode D3 is with after the parallel circuits of switching tube Q4 and diode D4 is connected, again with by the parallel circuits of switching tube Q5 and diode D5 and circuit parallel connection after the parallel circuits of switching tube Q6 and diode D6 is connected.
4. solar photovoltaic interconnected inverter according to claim 3 is characterized in that: described filter circuit (3) comprises inductance L 3, L4 and capacitor C, and the input of filter circuit (3) is connected with the output of inverter circuit (2).
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| CN2008101226781A CN101304221B (en) | 2008-06-19 | 2008-06-19 | Solar photovoltaic interconnected inverter |
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| CN101304221B true CN101304221B (en) | 2011-09-28 |
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Families Citing this family (23)
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| CN101667789B (en) * | 2009-04-14 | 2012-05-30 | 初萍 | Inverter circuit used for solar energy photovoltaic grid connection and device thereof |
| CN101673313B (en) * | 2009-10-15 | 2011-03-02 | 山东电力研究院 | Photovoltaic power station mathematical modeling method for transient/dynamic analysis of power system |
| EP2367275B2 (en) * | 2010-03-18 | 2020-12-23 | MARICI Holdings The Netherlands B.V. | Non-isolated DC - DC converter for solar power plant |
| CN101860041B (en) * | 2010-05-04 | 2012-08-29 | 阳光电源股份有限公司 | Method for dynamically adjusting busbar voltage to improve grid connection efficiency |
| CN101951193A (en) * | 2010-09-16 | 2011-01-19 | 薛韬 | Cellular photovoltaic power station |
| CN101980409B (en) * | 2010-11-25 | 2013-06-19 | 河北工业大学 | Grid-connected photovoltaic inverter |
| JP5659290B2 (en) | 2011-02-23 | 2015-01-28 | 東芝三菱電機産業システム株式会社 | Solar power system |
| CN102158109A (en) * | 2011-03-17 | 2011-08-17 | 上海威特力焊接设备制造股份有限公司 | Photovoltaic synchronization inverter system |
| CN102684523A (en) * | 2011-03-18 | 2012-09-19 | 上海神飞能源科技有限公司 | Solar photovoltaic inverter topology circuit |
| CN102801350A (en) * | 2011-05-23 | 2012-11-28 | 盈威力新能源科技(上海)有限公司 | H-bridge photovoltaic grid-connected inverter |
| CN102487199B (en) * | 2011-10-17 | 2014-06-04 | 深圳市安托山技术有限公司 | Soft switching grid-connected inverter |
| CN102437758A (en) * | 2011-10-25 | 2012-05-02 | 阳光电源股份有限公司 | Single-phase inverter |
| WO2014087286A2 (en) * | 2012-12-04 | 2014-06-12 | Koninklijke Philips N.V. | Power quality issue mitigation through hybrid grid |
| CN103872939B (en) * | 2012-12-18 | 2016-12-28 | 比亚迪股份有限公司 | A kind of two-way booster circuit inverter system and control method thereof |
| CN103116383B (en) * | 2012-12-25 | 2015-01-07 | 深圳创动科技有限公司 | Two-way boost photovoltaic inverter and control method thereof |
| CN103066623A (en) * | 2013-01-11 | 2013-04-24 | 无锡中洁能源技术有限公司 | Photovoltaic grid-connected inverter |
| US9065323B2 (en) * | 2013-03-04 | 2015-06-23 | Astec International Limited | Systems and methods for detecting islanding conditions in grid-tied inverters |
| GB201312621D0 (en) * | 2013-07-15 | 2013-08-28 | Univ Plymouth | Control arrangement |
| CN104734548B (en) * | 2015-04-07 | 2017-11-07 | 深圳市英威腾电气股份有限公司 | A kind of control method of photovoltaic combining inverter and photovoltaic combining inverter |
| CN108899937A (en) * | 2018-09-05 | 2018-11-27 | 阳光电源股份有限公司 | A kind of exchange optimizer system |
| CN109256974A (en) * | 2018-09-26 | 2019-01-22 | 深圳古瑞瓦特新能源股份有限公司 | A kind of solar energy inverter circuit |
| CN111313472A (en) * | 2020-03-31 | 2020-06-19 | 国网安徽省电力有限公司六安供电公司 | High-efficiency module combined photovoltaic inverter |
| CN116760275B (en) * | 2023-08-17 | 2023-11-03 | 成都吉瓦特科技有限公司 | Island-preventing circuit of miniature photovoltaic grid-connected inverter |
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