CN102510234A - Method and system for controlling inversion of direct current bus voltage of photovoltaic grid-connected inverter - Google Patents
Method and system for controlling inversion of direct current bus voltage of photovoltaic grid-connected inverter Download PDFInfo
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- CN102510234A CN102510234A CN2011103538544A CN201110353854A CN102510234A CN 102510234 A CN102510234 A CN 102510234A CN 2011103538544 A CN2011103538544 A CN 2011103538544A CN 201110353854 A CN201110353854 A CN 201110353854A CN 102510234 A CN102510234 A CN 102510234A
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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 provides a method for controlling inversion of a direct current bus voltage of a photovoltaic grid-connected inverter. The method comprises the following steps of: acquiring a grid voltage Vac and an input direct current voltage Vpv; judging whether Vpv is not less than 1.6 Vac, if so, turning off a boost circuit, otherwise, turning on the boost circuit; and inverting the input direct current voltage Vpv. The invention also provides a control system for implementing the method. By the invention, a bus voltage can be intelligently adjusted in real time, so that the working time of the boost circuit is shortened, electromagnetic interference is reduced, and system efficiency is improved.
Description
Technical field
The present invention relates to the solar photovoltaic technology field, be specifically related to a kind of photovoltaic combining inverter and become DC bus-bar voltage control method and control system.
Background technology
Solar energy is a kind of green, reproducible clean energy resource, and the application of solar energy power generating more and more receives the people of the world's concern, has become the useful of fossil energy at present and has replenished.Photovoltaic combining inverter is one of core component of photovoltaic generating system, and effect is that the direct current energy that photovoltaic module produces is converted to AC energy and is delivered to electrical network, and the quality of its performance has very big influence to the reliable and stable operation of whole system.Because the power of photovoltaic module monolithic is less; Output voltage is lower; In a lot of power stations, to photovoltaic module be carried out connection in series-parallel and use, require photovoltaic combining inverter that the voltage power supply scope than broad is arranged usually, such as can both normally moving from 150V – 580V.When the voltage that is incorporated into the power networks is alternating current 220V, promote link, can promote direct voltage, also can promote alternating voltage if direct voltage below 400V, needs voltage.In non-isolated photovoltaic combining inverter, it is the Boost structure that the voltage of taking usually promotes structure, belongs to the direct voltage hoisting way at present.
At present adopting the Boost voltage boosting method in the photovoltaic combining inverter is the direct voltage that lower direct voltage is promoted to higher stable, and in order to guarantee also normally inversion when the alternating voltage peak, the direct voltage after the lifting is 400V usually.If direct voltage is lower than 400V, the Boost circuit will be worked always, have conduction loss and switching loss during its work, and be accompanied by harmful electromagnetic radiation, concerning inverter, increase electromagnetic interference and reduce efficient.
Summary of the invention
In view of this, being necessary provides a kind of and both can reduce the Boost circuit working time to the problem of mentioning in the background technology, can make the control method and the control system of the normal inversion of photovoltaic combining inverter again.
The present invention realizes through following technical scheme:
A kind of photovoltaic combining inverter becomes the DC bus-bar voltage control method, and it may further comprise the steps:
Gather line voltage Vac and input direct voltage Vpv;
Judge whether Vpv >=1.6Vac sets up;
As to be judged as be to close the Boost circuit; As be judged as not, open the Boost circuit;
Input direct voltage Vpv is carried out inversion.
Wherein, described as be judged as and be, close the Boost circuit, specifically comprise: when judged result when being, adopt a bypass diode short circuit Boost inductance and a Boost diode, realization Boost circuit is not worked.
Wherein, described as be not judged as not, open the Boost circuit, specifically comprise: when judged result for not the time, open the Boost circuit, described Vpv is risen to 1.6 times of Vac.
A kind of photovoltaic combining inverter becomes the DC bus-bar voltage control system, and it comprises:
One acquisition module is used to gather line voltage Vac and input direct voltage Vpv;
One judge module is used for judging whether Vpv＞1.6Vac sets up;
One closing module is used for closing the Boost circuit when being judged as when being;
One opens module, is used for when being judged as not, opening the Boost circuit;
One inversion module is used for input direct voltage Vpv is carried out inversion.
Wherein, said closing module specifically is used for: when judged result when being, through a bypass diode short circuit Boost inductance and a Boost diode, realize that the Boost circuit do not work.
Said opening module specifically is used for: when judged result for not the time, described Vpv is risen to 1.6 times of Vac.
Compared with prior art, the present invention possesses following advantage: can adjust busbar voltage intelligently in real time, thereby reduce the operating time of Boost circuit, reduce electromagnetic interference, improve system effectiveness.
Description of drawings
Fig. 1 is the schematic flow sheet of the embodiment of the invention one;
Fig. 2 is a photovoltaic combining inverter main circuit sketch map of the present invention;
Fig. 3 is the schematic equivalent circuit of Boost circuit of the present invention when not working;
Schematic equivalent circuit when Fig. 4 is a Boost circuit working of the present invention.
Embodiment
Embodiment one:
As shown in Figure 1, the embodiment of the invention one provides a kind of photovoltaic combining inverter to become the DC bus-bar voltage control method, and it may further comprise the steps:
Gather line voltage Vac and input direct voltage Vpv: as shown in Figure 2; The photovoltaic combining inverter main circuit comprises a Boost circuit; Said Boost circuit comprises a Boost inductance and the Boost diode D2 that is connected in series; A this Boost circuit and a capacitor C 2 are connected in series between the both positive and negative polarity of input of direct voltage Vpv of inverter, and a bypass diode D1 is parallelly connected with the Boost circuit, and the voltage Vc on the capacitor C 2 is the required direct voltage of inversion; Also claim busbar voltage, line voltage Vac is the line voltage after the inversion;
Judge whether Vpv >=1.6Vac sets up;
As to be judged as be to close the Boost circuit: when judged result when being, as shown in Figure 3; Control bypass diode D1 conducting, thus short circuit Boost inductance and Boost diode realize closing the Boost circuit; Voltage Vc on the capacitor C 2 is the required direct voltage of inversion, and under this mode of operation, Vc and Vpv equate; Power tube Q1 is turned off, and has so just reduced loss and electromagnetic interference noise;
As be not judged as not, open the Boost circuit: when judged result for not the time, as shown in Figure 4; At input direct voltage Vpv during less than 1.6 times of alternating voltage Vac; Open the Boost circuit, bypass diode D1 is equivalent to open circuit, and the Boost circuit rises to 1.6 times of Vac with Vpv voltage;
Input direct voltage Vpv is carried out inversion.
Present embodiment is in alternating voltage Vac change procedure, and busbar voltage Vc changes with Vac, when Vpv >=1.6Vac, Vc=Vpv, when Vpv during 1.6Vac, Vc=1.6Vac.Busbar voltage Vc is not unalterable, and its numerical value is decided by Vpv and Vac.
Embodiment two:
Present embodiment provides the control system of the control method of a kind of embodiment of realization one, and it comprises:
One acquisition module is used to gather line voltage Vac and input direct voltage Vpv;
One judge module is used for judging whether Vpv >=1.6Vac sets up;
One closing module is used for closing the Boost circuit when being judged as when being;
One opens module, is used for when being judged as not, opening the Boost circuit;
One inversion module is used for input direct voltage Vpv is carried out inversion.
As shown in Figure 2; The photovoltaic combining inverter main circuit comprises a Boost circuit, and said Boost circuit comprises a Boost inductance and the Boost diode D2 that is connected in series, and this a Boost circuit and a capacitor C 2 are connected in series between the both positive and negative polarity of input of direct voltage Vpv of inverter; One bypass diode D1 is parallelly connected with the Boost circuit; Voltage Vc on the capacitor C 2 is the required direct voltage of inversion, also claims busbar voltage, and line voltage Vac is the line voltage after the inversion.
Said closing module specifically is used for: when judged result when being, as shown in Figure 3; Control bypass diode D1 conducting, thus short circuit Boost inductance and Boost diode realize closing the Boost circuit; Voltage Vc on the capacitor C 2 is the required direct voltage of inversion, and under this mode of operation, Vc and Vpv equate; Power tube Q1 is turned off, and has so just reduced loss and electromagnetic interference noise.
The said module of opening specifically is used for: when judged result for not the time, as shown in Figure 4; At input direct voltage Vpv during less than 1.6 times of alternating voltage Vac; Open the Boost circuit, bypass diode D1 is equivalent to open circuit, and the Boost circuit rises to 1.6 times of Vac with Vpv voltage.
Claims (6)
1. a photovoltaic combining inverter becomes the DC bus-bar voltage control method, it is characterized in that: may further comprise the steps:
Gather line voltage Vac and input direct voltage Vpv;
Judge whether Vpv >=1.6Vac sets up;
As to be judged as be to close the Boost circuit; As be judged as not, open the Boost circuit;
Input direct voltage Vpv is carried out inversion.
2. method according to claim 1; It is characterized in that: described as be judged as and be, close the Boost circuit, specifically comprise: when judged result when being; Adopt a bypass diode short circuit Boost inductance and a Boost diode, realization Boost circuit is not worked.
3. method according to claim 1 is characterized in that: described as be not judged as not, open the Boost circuit, specifically comprise: when judged result for not the time, open the Boost circuit, described Vpv is risen to 1.6 times of Vac.
4. a photovoltaic combining inverter becomes the DC bus-bar voltage control system, it is characterized in that: comprising:
One acquisition module is used to gather line voltage Vac and input direct voltage Vpv;
One judge module is used for judging whether Vpv＞1.6Vac sets up;
One closing module is used for closing the Boost circuit when being judged as when being;
One opens module, is used for when being judged as not, opening the Boost circuit;
One inversion module is used for input direct voltage Vpv is carried out inversion.
5. system according to claim 4 is characterized in that: said closing module specifically is used for: when judged result when being, through a bypass diode short circuit Boost inductance and a Boost diode, realize that the Boost circuit do not work.
6. system according to claim 4 is characterized in that: said opening module specifically is used for: when judged result for not the time, described Vpv is risen to 1.6 times of Vac.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011103538544A CN102510234A (en) | 2011-11-10 | 2011-11-10 | Method and system for controlling inversion of direct current bus voltage of photovoltaic grid-connected inverter |
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| CN2011103538544A CN102510234A (en) | 2011-11-10 | 2011-11-10 | Method and system for controlling inversion of direct current bus voltage of photovoltaic grid-connected inverter |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103312140A (en) * | 2013-06-07 | 2013-09-18 | 南京航空航天大学 | Starting method of multi-branch two-stage three-phase photovoltaic grid-connected inverter |
| CN103546050A (en) * | 2012-07-09 | 2014-01-29 | 江苏固德威电源科技有限公司 | High-efficiency segmented inverse circuit topology structure |
| CN103812373A (en) * | 2014-01-16 | 2014-05-21 | 深圳市保益新能电气有限公司 | DC (Direct Current)-AC (Alternating Current) transfer circuit and control method thereof |
| CN104270022A (en) * | 2014-09-30 | 2015-01-07 | 马鞍山市安工大工业技术研究院有限公司 | Photovoltaic grid connected inversion circuit, switch control circuit and control method |
| CN104393833A (en) * | 2014-11-21 | 2015-03-04 | 南车株洲电力机车研究所有限公司 | Photovoltaic intelligent power |
| CN104638971A (en) * | 2015-02-13 | 2015-05-20 | 河海大学 | Photovoltaic grid-connected inverter and control method thereof |
| CN104953882A (en) * | 2014-03-31 | 2015-09-30 | 株式会社安川电机 | Power converter, power generation system, control apparatus, and power conversion method |
| CN105186901A (en) * | 2015-09-06 | 2015-12-23 | 阳光电源股份有限公司 | Input voltage control method and device of five-level inverter |
| CN108418416A (en) * | 2018-03-19 | 2018-08-17 | 盐城工学院 | A kind of cooperative control method of Partial Power processing boosting unit and gird-connected inverter |
| CN111162735A (en) * | 2020-03-03 | 2020-05-15 | 阳光电源股份有限公司 | Boost circuit failure detection method and device |
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| US20090121549A1 (en) * | 2007-11-14 | 2009-05-14 | General Electric Company | Method and system to convert direct current (dc) to alternating current (ac) using a photovoltaic inverter |
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| JP2000184744A (en) * | 1998-12-17 | 2000-06-30 | Hitachi Lighting Ltd | Inverter |
| CN201029220Y (en) * | 2007-02-06 | 2008-02-27 | 艾默生网络能源有限公司 | Solar inverter circuit |
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Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103546050A (en) * | 2012-07-09 | 2014-01-29 | 江苏固德威电源科技有限公司 | High-efficiency segmented inverse circuit topology structure |
| CN103312140B (en) * | 2013-06-07 | 2015-06-10 | 南京航空航天大学 | Starting method of multi-branch two-stage three-phase photovoltaic grid-connected inverter |
| CN103312140A (en) * | 2013-06-07 | 2013-09-18 | 南京航空航天大学 | Starting method of multi-branch two-stage three-phase photovoltaic grid-connected inverter |
| CN103812373A (en) * | 2014-01-16 | 2014-05-21 | 深圳市保益新能电气有限公司 | DC (Direct Current)-AC (Alternating Current) transfer circuit and control method thereof |
| CN104953882A (en) * | 2014-03-31 | 2015-09-30 | 株式会社安川电机 | Power converter, power generation system, control apparatus, and power conversion method |
| CN104270022A (en) * | 2014-09-30 | 2015-01-07 | 马鞍山市安工大工业技术研究院有限公司 | Photovoltaic grid connected inversion circuit, switch control circuit and control method |
| CN104270022B (en) * | 2014-09-30 | 2017-02-15 | 马鞍山市安工大工业技术研究院有限公司 | Photovoltaic grid connected inversion circuit, switch control circuit and control method |
| CN104393833A (en) * | 2014-11-21 | 2015-03-04 | 南车株洲电力机车研究所有限公司 | Photovoltaic intelligent power |
| US10122176B2 (en) | 2014-11-21 | 2018-11-06 | Crrc Zhuzhou Institute Co., Ltd. | Photovoltaic intelligent power supply |
| CN104638971A (en) * | 2015-02-13 | 2015-05-20 | 河海大学 | Photovoltaic grid-connected inverter and control method thereof |
| CN105186901A (en) * | 2015-09-06 | 2015-12-23 | 阳光电源股份有限公司 | Input voltage control method and device of five-level inverter |
| CN105186901B (en) * | 2015-09-06 | 2017-10-27 | 阳光电源股份有限公司 | A kind of five-electrical level inverter input voltage control method and device |
| CN108418416A (en) * | 2018-03-19 | 2018-08-17 | 盐城工学院 | A kind of cooperative control method of Partial Power processing boosting unit and gird-connected inverter |
| CN111162735A (en) * | 2020-03-03 | 2020-05-15 | 阳光电源股份有限公司 | Boost circuit failure detection method and device |
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Application publication date: 20120620 |