CN106169880B - A kind of discontinuous operation control method of string type photovoltaic DC-to-AC converter - Google Patents
A kind of discontinuous operation control method of string type photovoltaic DC-to-AC converter Download PDFInfo
- Publication number
- CN106169880B CN106169880B CN201610487169.3A CN201610487169A CN106169880B CN 106169880 B CN106169880 B CN 106169880B CN 201610487169 A CN201610487169 A CN 201610487169A CN 106169880 B CN106169880 B CN 106169880B
- Authority
- CN
- China
- Prior art keywords
- voltage
- inverter
- bus
- under
- control method
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
Landscapes
- Inverter Devices (AREA)
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
Abstract
Photovoltaic DC-to-AC converter technical field of the present invention, disclose a kind of discontinuous operation control method of string type photovoltaic DC-to-AC converter, the control method is, inverter uses continuous operation mode in normal power section, when input power deficiency, when bus capacitor voltage drops at under-voltage, one or more grid cycle of inverter circuit stopping power output, the BOOST circuits of inverter work on to charge to bus capacitor, and when busbar voltage restores normal value, inverter circuit starts power output.The present invention is when in use, inverter uses common continuous operation mode in normal power section, uses discontinuous operation pattern, this method that can effectively solve the problems, such as that inverter is repeatedly grid-connected when intensity of illumination is low in extremely low power section, it reduces relay repeatedly to start, improves the bulk life time of inverter.
Description
Technical field
The present invention relates to photovoltaic DC-to-AC converter technical fields, more specifically, more particularly to a kind of string type photovoltaic DC-to-AC converter
Discontinuous operation control method.
Background technology
Photovoltaic generation is a kind of skill that luminous energy is directly translated into electric energy using the photovoltaic effect of interface
Art.Mainly it is made of solar panel (component), controller and inverter three parts.
Due to safety need, string type photovoltaic combining inverter output power grid between have electromagnetic relay control physics every
From.Due to inverter output filter capacitor, moment power grid is closed to capacitor charging in relay.The electric current for being closed moment is larger,
The relay contact service life will be directly affected.Therefore for improve inverter bulk life time, need to reduce to the greatest extent inverter sooner or later beat repeatedly after
Electric appliance is grid-connected.
Traditional gird-connected inverter need to be set the grid-connected power of minimal maintenance, in the morning, be close to due to current sensor precision
When evening or rainy weather, intensity of illumination is relatively low, and photovoltaic battery panel output power is insufficient, and inverter enters and after net state, electricity
Pond plate output voltage shuts down after continuing to decline to under-voltage point, after cell plate voltage restores normal, start again it is grid-connected, so
Repeatedly, and this duration state morning and evening is longer, and grid-connected power is maintained until photovoltaic battery panel output power is more than.And it is anti-
The redoubling net strong influence service life of relay contact.
Invention content
The purpose of the present invention is to provide a kind of discontinuous operation control methods of string type photovoltaic DC-to-AC converter, and this method is in light
When low according to intensity, it is possible to reduce string type photovoltaic DC-to-AC converter is repeatedly grid-connected, and then extends the service life of relay contact.
In order to achieve the above object, the technical solution adopted by the present invention is as follows：
A kind of discontinuous operation control method of string type photovoltaic DC-to-AC converter, the control method are that inverter is in normal power
Continuous operation mode is used when section, when input power deficiency, when bus capacitor voltage drops at under-voltage, inverter circuit stops work(
Rate exports one or more grid cycle, and the BOOST circuits of inverter work on to charge to bus capacitor, waits for that busbar voltage is restored
When normal value, inverter circuit starts power output.
Further, the control method specifically includes following steps,
A, the under-voltage point V_BUS_L of busbar voltage is set, busbar voltage restores electrical voltage point V_BUS_N, and busbar voltage is under-voltage
Point V_BUS_L is more than network voltage peak value；
B, setting is minimum maintains grid-connected current reference value I_REF_L；
C, when falling to under-voltage point V_BUS_L under solar panel underpower, busbar voltage V_BUS, between inverter circuit enters
State of having a rest stops power output, and BOOST circuits work on to charge to bus capacitor C0, when busbar voltage is restored normally to voltage
When point V_BUS_N, inverter circuit restores power output；
D, when solar panel power is smaller and smaller, it is increasingly longer that inverter circuit enters the intermittent condition time, until inverter circuit
Stop power output completely, Boost circuit is also unable to maintain that busbar voltage, and final busbar voltage is under-voltage, inverter shutdown.
Compared with the prior art, the advantages of the present invention are as follows：In the use of the present invention, inverter is used in normal power section
Common continuous operation mode, extremely low power section use discontinuous operation pattern, this method can effectively solve intensity of illumination it is low when
Grid-connected problem, reduction relay start inverter repeatedly repeatedly, improve the bulk life time of inverter.
Description of the drawings
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technology description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
Obtain other attached drawings according to these attached drawings.
Fig. 1 is the basic topology circuit diagram of string type photovoltaic DC-to-AC converter.
Fig. 2 is the flow chart of the discontinuous operation control method of the string type photovoltaic DC-to-AC converter of the present invention.
Fig. 3 is busbar voltage and grid-connected current oscillogram when the string type photovoltaic DC-to-AC converter of the present invention is in intermittent mode.
Specific implementation mode
The preferred embodiment of the present invention is described in detail below in conjunction with the accompanying drawings, so that advantages and features of the invention energy
It is easier to be readily appreciated by one skilled in the art, so as to make a clearer definition of the protection scope of the present invention.
In order to reach the purpose of the present invention, the technical solution adopted by the present invention is as follows：
A kind of discontinuous operation control method of string type photovoltaic DC-to-AC converter provided by the invention, which is inversion
Device uses continuous operation mode in normal power section, inverse when bus capacitor voltage drops at under-voltage when input power deficiency
One or more grid cycle of change circuit stopping power output, the BOOST circuits of inverter work on to charge to bus capacitor, waits for
When busbar voltage restores normal value, inverter circuit starts power output.
Refering to fig. 1 shown in-Fig. 2, the discontinuous operation control method of string type photovoltaic DC-to-AC converter of the invention specifically include with
Lower step：
A, the under-voltage point V_BUS_L of busbar voltage is set, busbar voltage restores electrical voltage point V_BUS_N, and busbar voltage is under-voltage
Point V_BUS_L is more than network voltage peak value；
B, setting is minimum maintains grid-connected current reference value I_REF_L；
C, when falling to under-voltage point V_BUS_L under solar panel underpower, busbar voltage V_BUS, between inverter circuit enters
State of having a rest stops power output, and BOOST circuits work on to charge to bus capacitor C0, when busbar voltage is restored normally to voltage
When point V_BUS_N, inverter circuit restores power output；
D, when solar panel power is smaller and smaller (such as moment at dusk), inverter circuit enters the intermittent condition time increasingly
Long, until inverter circuit stops power output completely, Boost circuit is also unable to maintain that busbar voltage, and final busbar voltage is under-voltage,
Inverter shuts down.
When Fig. 3 is that the string type photovoltaic DC-to-AC converter that this example carries out an invention is in intermittent mode, busbar voltage and grid-connected current
Waveform example figure.Wherein, t0-t1 solar panels underpower falls to under-voltage point V_BUS_L under busbar voltage V_BUS；T1-t2 is inverse
Power transformation routing continuous duty enters intermittent condition and stops power output, and BOOST circuits work on to be filled to bus capacitor C0
Electricity, busbar voltage are restored to V_BUS_N；T2-t3 inverter circuits maintain grid-connected current to restore power output, busbar voltage with minimum
Again fall to under-voltage point V_BUS_L down.
In the use of the present invention, inverter uses common continuous operation mode in normal power section, adopted in extremely low power section
With discontinuous operation pattern, this method can effectively solve the problems, such as that inverter is repeatedly grid-connected when intensity of illumination is low, and it is anti-to reduce relay
It is multiple to start, improve the bulk life time of inverter.
The advantage of the invention is that：
1) the grid-connected power of average minimal maintenance, is considerably reduced, inverter weighing repeatedly in extremely low power section is avoided
It opens, extends the service life of relay and complete machine.
2) inverter poles low power period grid-connected current quality, is improved.
3) photovoltaic cell capable of generating power, is utilized to greatest extent, improves illumination deficiency state power station whole efficiency.
Although the embodiments of the invention are described in conjunction with the attached drawings, but patent owner can be in appended claims
Within the scope of make various deformations or amendments, as long as it does not exceed the scope of protection described in the claims to the invention, all should
Within protection scope of the present invention.
Claims (1)
1. a kind of discontinuous operation control method of string type photovoltaic DC-to-AC converter, it is characterised in that：The control method is that inverter exists
Continuous operation mode is used when normal power section, when input power deficiency, when bus capacitor voltage drops at under-voltage, inversion electricity
One or more grid cycle of road stopping power output, the BOOST circuits of inverter work on to charge to bus capacitor, waits for busbar
When voltage restores normal value, inverter circuit starts power output；
The control method specifically includes following steps,
A, the under-voltage point V_BUS_L of busbar voltage is set, busbar voltage restores electrical voltage point V_BUS_N, and the under-voltage point V_ of busbar voltage
BUS_L is more than network voltage peak value；
B, setting is minimum maintains grid-connected current reference value I_REF_L；
C, when falling to under-voltage point V_BUS_L under solar panel underpower, busbar voltage V_BUS, inverter circuit enters interval shape
State stops power output, and BOOST circuits work on to charge to bus capacitor C0, when busbar voltage is restored normally to electrical voltage point V_
When BUS_N, inverter circuit restores power output；
D, when solar panel power is smaller and smaller, it is increasingly longer that inverter circuit enters the intermittent condition time, until inverter circuit is complete
Stop power output, Boost circuit is also unable to maintain that busbar voltage, and final busbar voltage is under-voltage, inverter shutdown.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610487169.3A CN106169880B (en) | 2016-06-24 | 2016-06-24 | A kind of discontinuous operation control method of string type photovoltaic DC-to-AC converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610487169.3A CN106169880B (en) | 2016-06-24 | 2016-06-24 | A kind of discontinuous operation control method of string type photovoltaic DC-to-AC converter |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN106169880A CN106169880A (en) | 2016-11-30 |
| CN106169880B true CN106169880B (en) | 2018-11-02 |
Family
ID=58065332
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610487169.3A Active CN106169880B (en) | 2016-06-24 | 2016-06-24 | A kind of discontinuous operation control method of string type photovoltaic DC-to-AC converter |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN106169880B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108964136B (en) * | 2018-09-17 | 2020-09-11 | 阳光电源股份有限公司 | Photovoltaic turn-off system and control method thereof |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136734A (en) * | 2010-09-08 | 2011-07-27 | 上海岩芯电子科技有限公司 | Method for tracing maximum power point of photovoltaic miniature grid-connected inverter |
| CN103560659A (en) * | 2013-10-25 | 2014-02-05 | 西安龙腾新能源科技发展有限公司 | Method for preventing photovoltaic grid-connected inverter from being started and shut down frequently under low light level |
| CN103701151A (en) * | 2014-01-09 | 2014-04-02 | 惠州天能源科技有限公司 | Software control method for solving low energy input and repeated starting of single-phase photovoltaic inverter |
| CN103730911A (en) * | 2013-12-25 | 2014-04-16 | 常熟开关制造有限公司(原常熟开关厂） | Grid connection method of photovoltaic grid connection inverter and photovoltaic grid connection power generating system |
| CN104104325A (en) * | 2014-08-05 | 2014-10-15 | 阳光电源股份有限公司 | Method and system for controlling series photovoltaic inverter |
| CN104158218A (en) * | 2014-08-27 | 2014-11-19 | 阳光电源股份有限公司 | Photovoltaic inverter starting control method and system and photovoltaic power generation system |
-
2016
- 2016-06-24 CN CN201610487169.3A patent/CN106169880B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102136734A (en) * | 2010-09-08 | 2011-07-27 | 上海岩芯电子科技有限公司 | Method for tracing maximum power point of photovoltaic miniature grid-connected inverter |
| CN103560659A (en) * | 2013-10-25 | 2014-02-05 | 西安龙腾新能源科技发展有限公司 | Method for preventing photovoltaic grid-connected inverter from being started and shut down frequently under low light level |
| CN103730911A (en) * | 2013-12-25 | 2014-04-16 | 常熟开关制造有限公司(原常熟开关厂） | Grid connection method of photovoltaic grid connection inverter and photovoltaic grid connection power generating system |
| CN103701151A (en) * | 2014-01-09 | 2014-04-02 | 惠州天能源科技有限公司 | Software control method for solving low energy input and repeated starting of single-phase photovoltaic inverter |
| CN104104325A (en) * | 2014-08-05 | 2014-10-15 | 阳光电源股份有限公司 | Method and system for controlling series photovoltaic inverter |
| CN104158218A (en) * | 2014-08-27 | 2014-11-19 | 阳光电源股份有限公司 | Photovoltaic inverter starting control method and system and photovoltaic power generation system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN106169880A (en) | 2016-11-30 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102545257B (en) | Solar photovoltaic generating single-phase grid-connected inverter and control method thereof | |
| CN102253278B (en) | Startup condition detection method suitable for photovoltaic inverter with DC/DC (direct current/direct current) | |
| WO2012144358A1 (en) | Power supply device, control method for power supply device, and dc power supply system | |
| EP2587612B1 (en) | Methods and systems for operating a power conversion system | |
| CN105375519A (en) | Grid-connected photovoltaic power generation system and control method therefor | |
| CN102510234A (en) | Method and system for controlling inversion of direct current bus voltage of photovoltaic grid-connected inverter | |
| CN105552952A (en) | Photovoltaic-energy storage hybrid power generation system and energy management method therefor | |
| CN103701151A (en) | Software control method for solving low energy input and repeated starting of single-phase photovoltaic inverter | |
| CN106169880B (en) | A kind of discontinuous operation control method of string type photovoltaic DC-to-AC converter | |
| CA2639290A1 (en) | Method for operating an inverter | |
| CN203859575U (en) | Reverse control integrated machine of hybrid power photovoltaic energy-storage system | |
| CN102480132A (en) | Starting method for photovoltaic grid-connected power generating system and device | |
| CN204498015U (en) | Based on the photovoltaic control system of MPPT | |
| CN102780233A (en) | Large-scale distributed photovoltaic power station user-side grid countercurrent-preventive system | |
| CN205657469U (en) | Can realize independent photovoltaic intelligent control device of quick charge | |
| CN203761058U (en) | Solar DC grid-connected generation DC-DC special-purpose control device of communication base station | |
| CN112838583A (en) | Static generator power supply system and control method thereof | |
| CN205509924U (en) | Photovoltaic power generation control system of autonomic formula | |
| CN205039571U (en) | Photovoltaic power generation control circuit | |
| CN204206014U (en) | A kind of 3KW photovoltaic combining inverter | |
| CN207638341U (en) | A kind of solar power system | |
| CN203827035U (en) | Photovoltaic power generation control circuit | |
| CN219322086U (en) | Grid-connected power generation micro-light control system | |
| CN205283232U (en) | Digitally controlled's photovoltaic power generation system three -terminal seamless handover device | |
| CN214314585U (en) | Photovoltaic power generation grid-connected system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| CB03 | Change of inventor or designer information |
Inventor after: The Gan of Ouyang family Inventor after: Lu Xueming Inventor after: Tu Zhiwen Inventor after: Li Yun Inventor before: Lu Xueming Inventor before: The Gan of Ouyang family Inventor before: Tu Zhiwen Inventor before: Li Yun |
|
| COR | Change of bibliographic data | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |