CN101621205B - Grid-combination operation method of photovoltaic grid-combination inverter containing transformer at AC side - Google Patents
Grid-combination operation method of photovoltaic grid-combination inverter containing transformer at AC side Download PDFInfo
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- CN101621205B CN101621205B CN2009101445054A CN200910144505A CN101621205B CN 101621205 B CN101621205 B CN 101621205B CN 2009101445054 A CN2009101445054 A CN 2009101445054A CN 200910144505 A CN200910144505 A CN 200910144505A CN 101621205 B CN101621205 B CN 101621205B
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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 relates to a grid-combination operation method of a photovoltaic grid-combination inverter containing a transformer at an AC side. The DC side of the inverter is provided with a DC voltage transducer, and the AC output side of the inverter is provided with an AC contactor; after the inverter is started, the AC contactor remains disconnection, the DC voltage transducer is used for detecting a voltage amplitude value of the DC voltage of the inverter; after the voltage of the DC side achieves a lowest starting voltage point of the inverter, the inverter independently operates firstly, exciting current of the transformer is established step by step until the inverter detects the stable voltage of the DC side at the lowest starting voltage point, and the inverter controls the AC contactor to actuate so as to be combined to the grid; if the voltage of the AC side always can not be stabilized at the lowest starting voltage point, and the AC contactor retains a disconnection state, the inverter is not combined to the grid. The grid-combination operation method can not cause the frequent switch-on and shut-down of a system and a contactor at the AC side, thereby increasing the system reliability.
Description
Technical field
The present invention relates to a kind of combination method of photovoltaic combining inverter, be specifically related to a kind of photovoltaic combining inverter that AC side comprises band power frequency isolating transformer method that is incorporated into the power networks that is used for.
Background technology
The photovoltaic combining inverter of band power frequency isolating transformer generally is when the direct voltage of input reaches Minimum Acceptable Value when being incorporated into the power networks at present, with regard to the contactor or the relay of adhesive AC side, makes AC side insert electrical network and begins to generate electricity by way of merging two or more grid systems.This logic control mode that directly is incorporated into the power networks; At first can make direct voltage when solar cell array when the input voltage minimum point fluctuates up and down; The mode that promptly when the DC side energy shortage, is incorporated into the power networks by force; Can cause frequent switching on and shutting down of system and AC side contactor to open shutoff repeatedly, shorten the life-span of contactor, reduce the reliability of system; Secondly, when the energy that provides when the direct current input is not enough, need set up excitation to transformer, cause the energy loss of electrical network on the contrary from the AC side power taking.This situation when rainy weather, seems particularly outstanding.
Summary of the invention
The present invention is directed to the deficiency of prior art, designed and developed out a kind of frequent switching on and shutting down of system and AC side contactor of can not causing and opened shutoff repeatedly, the photovoltaic combining inverter that the has improved system reliability method that is incorporated into the power networks.
The present invention realizes through following technical scheme:
A kind of photovoltaic combining inverter that AC side comprises transformer method that is incorporated into the power networks that is used for is characterized in that the direct current input side of inverter is equipped with the direct voltage transducer, exchanges outlet side A.C. contactor is installed; Behind the inverter startup, A.C. contactor keeps off-state, and the direct voltage transducer at first detects the voltage magnitude of inverter direct-current voltage, and the direct voltage transducer is handled the data of being gathered and moved in order to control inverter by inverter control circuit; After dc voltage reaches the inverter lowest starting voltage point; Inverter independent operating at first under the situation that electrical network does not insert; This moment, A.C. contactor broke off, and progressively set up the exciting current of transformer, detected dc voltage until inverter and was stabilized on the lowest starting voltage point; The adhesive of inverter control A.C. contactor begins to generate electricity by way of merging two or more grid systems; If dc voltage can't be stable on the lowest starting voltage point all the time, inverter control circuit control A.C. contactor keeps off-state, and inverter is not incorporated into the power networks.
A kind of photovoltaic combining inverter that AC side comprises transformer method that is incorporated into the power networks that is used for; It is characterized in that working as at first independent operating of inverter; Detecting dc voltage was stabilized on the lowest starting voltage point after a period of time; The adhesive of inverter control circuit control A.C. contactor begins to be incorporated into the power networks.
Inverter is before generating electricity by way of merging two or more grid systems at every turn among the present invention, all needs at first set up excitation to transformer, satisfy above-mentioned terms and conditions after, generate electricity by way of merging two or more grid systems again.Be compared to common inverter and be incorporated into the power networks, this interconnection technology at first provides energy to set up excitation to transformer from the direct current input side, thereby need not to obtain magnetization energy from electrical network, has reduced system loss; Secondly under the not enough situation of dc energy, can't be incorporated into the power networks, so just avoided under the situation of dc energy deficiency, generating electricity by way of merging two or more grid systems the by force frequent switching on and shutting down that caused and the break-make repeatedly of A.C. contactor have improved the reliability of system.
Description of drawings
Accompanying drawing is the electrical block diagram of photovoltaic combining inverter grid-connected system of the present invention.
Embodiment
Shown in accompanying drawing.
Embodiment 1
The direct current input side of inverter 1 of the present invention is equipped with direct voltage transducer 2, exchanges outlet side A.C. contactor 3 is installed; After inverter 1 starts; A.C. contactor 3 keeps off-state; Direct voltage transducer 2 at first detects the voltage magnitude of inverter 1 direct voltage, and direct voltage transducer 2 is handled the data of being gathered and moved in order to control inverter 1 by inverter control circuit 4; After dc voltage reaches inverter 1 lowest starting voltage point; Inverter 1 independent operating at first under the situation that electrical network does not insert; A.C. contactor 3 breaks off at this moment, progressively sets up the exciting current of transformer 5, detects dc voltage until inverter 1 and is stabilized on the lowest starting voltage point; 3 adhesives of inverter control circuit 4 control A.C. contactors begin to generate electricity by way of merging two or more grid systems; If dc voltage can't be stable on the lowest starting voltage point all the time, inverter control circuit 4 control A.C. contactors 3 keep off-state, and inverter 1 is not incorporated into the power networks.
The direct current input side of inverter 1 of the present invention is equipped with direct voltage transducer 2, exchanges outlet side A.C. contactor 3 is installed; After inverter 1 starts; A.C. contactor 3 keeps off-state; Direct voltage transducer 2 at first detects the voltage magnitude of inverter 1 direct voltage, and direct voltage transducer 2 is handled the data of being gathered and moved in order to control inverter 1 by inverter control circuit 4; After dc voltage reaches inverter 1 lowest starting voltage point; Inverter 1 independent operating at first under the situation that electrical network does not insert; This moment, A.C. contactor 3 broke off, and progressively set up the exciting current of transformer 5, until inverter 1 detect dc voltage be stabilized in keep a period of time again on the lowest starting voltage point after; 3 adhesives of inverter control circuit 4 control A.C. contactors begin to generate electricity by way of merging two or more grid systems; If dc voltage can't be stable on the lowest starting voltage point all the time, inverter control circuit 4 control A.C. contactors 3 keep off-state, and inverter 1 is not incorporated into the power networks.
Claims (2)
1. one kind is used for photovoltaic combining inverter that AC side the comprises transformer method that is incorporated into the power networks, and it is characterized in that the direct current input side of inverter is equipped with the direct voltage transducer, exchanges outlet side A.C. contactor is installed; Behind the inverter startup, A.C. contactor keeps off-state, and the direct voltage transducer at first detects the voltage magnitude of inverter direct-current voltage, and the direct voltage transducer is handled the data of being gathered and moved in order to control inverter by inverter control circuit; After dc voltage reaches the inverter lowest starting voltage point; Inverter independent operating at first under the situation that electrical network does not insert; This moment, A.C. contactor broke off, and progressively set up the exciting current of transformer, detected dc voltage until inverter and was stabilized on the lowest starting voltage point; The adhesive of inverter control circuit control A.C. contactor begins to generate electricity by way of merging two or more grid systems; If dc voltage can't be stable on the lowest starting voltage point all the time, inverter control circuit control A.C. contactor keeps off-state, and inverter is not incorporated into the power networks.
2. a kind of photovoltaic combining inverter that AC side comprises transformer method that is incorporated into the power networks that is used for according to claim 1; It is characterized in that working as at first independent operating of inverter; Detecting dc voltage was stabilized on the lowest starting voltage point after a period of time; The adhesive of inverter control circuit control A.C. contactor begins to be incorporated into the power networks.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101445054A CN101621205B (en) | 2009-08-13 | 2009-08-13 | Grid-combination operation method of photovoltaic grid-combination inverter containing transformer at AC side |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2009101445054A CN101621205B (en) | 2009-08-13 | 2009-08-13 | Grid-combination operation method of photovoltaic grid-combination inverter containing transformer at AC side |
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| Publication Number | Publication Date |
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| CN101621205A CN101621205A (en) | 2010-01-06 |
| CN101621205B true CN101621205B (en) | 2012-06-27 |
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Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101950976B (en) * | 2010-08-25 | 2012-11-28 | 常熟开关制造有限公司(原常熟开关厂） | Grid-connected operation method of grid-connected type photovoltaic inverter |
| CN102480132B (en) * | 2010-11-26 | 2016-03-02 | 比亚迪股份有限公司 | For starting method and the device of grid-connected photovoltaic system |
| US8519568B2 (en) | 2011-09-16 | 2013-08-27 | General Electric Company | Inrush current protection for wind turbines and wind farms |
| CN102412595B (en) * | 2011-11-25 | 2013-07-17 | 北京金风科创风电设备有限公司 | Method for controlling connection between microgrid and large power grid |
| CN102904286B (en) * | 2012-10-23 | 2014-10-29 | 深圳市长昊机电有限公司 | Grid-connected inverter and control method thereof |
| CN103944492A (en) * | 2014-05-08 | 2014-07-23 | 阳光电源股份有限公司 | Inverter and photovoltaic power generation system |
| CN104701885A (en) * | 2015-04-02 | 2015-06-10 | 深圳市英威腾电气股份有限公司 | Starting method and control system for photovoltaic grid-connected inverter |
| CN110661295B (en) * | 2019-10-15 | 2022-07-15 | 阳光新能源开发股份有限公司 | Inverter and photovoltaic power generation system |
| CN116505524A (en) * | 2023-06-29 | 2023-07-28 | 深圳市高斯宝电气技术有限公司 | Power grid electricity taking topology of household storage inverter |
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Application publication date: 20100106 Assignee: Sungrow Power Supply Co.,Ltd. Assignor: Sun Grow Power Co., Ltd. Contract record no.: 2013340000107 Denomination of invention: Grid-combination operation method of photovoltaic grid-combination inverter containing transformer at AC side Granted publication date: 20120627 License type: Exclusive License Record date: 20130715 |
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