CN103986183B - A kind of grid-connected control system - Google Patents
A kind of grid-connected control system Download PDFInfo
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- CN103986183B CN103986183B CN201410127593.8A CN201410127593A CN103986183B CN 103986183 B CN103986183 B CN 103986183B CN 201410127593 A CN201410127593 A CN 201410127593A CN 103986183 B CN103986183 B CN 103986183B
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- 230000005611 electricity Effects 0.000 claims description 4
- 230000005855 radiation Effects 0.000 claims description 3
- 238000010248 power generation Methods 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 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
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Abstract
The present invention relates to field of photovoltaic power generation, relate in particular to a kind of grid-connected control system, comprising: photovoltaic module; Inverter; AC load and electrical network, it receives the sinusoidal ac that inverter is carried, and between electrical network and AC load, is provided with transformer; Dsp controller, its input is electrically connected with the output of inverter by voltage sample device, the output of dsp controller is electrically connected with AC load and electrical network respectively, the magnitude of voltage of the sinusoidal ac that voltage sample device Real-time Collection inverter is carried, and the magnitude of voltage collecting is sent to dsp controller, the required load voltage value of the magnitude of voltage that dsp controller is carried voltage sample device and AC load compares, the situation that is communicated with by multiple function change-over switch control AC loads with electrical network. The present invention, according to the voltage that need to carry corresponding size of AC load, reduces to greatest extent because carrying overtension or the too low infringement that AC load is caused, and extends the service life of AC load.
Description
Technical field
The present invention relates to field of photovoltaic power generation, relate in particular to a kind of grid-connected control system.
Background technology
Grid-connected photovoltaic system is exactly that solar photovoltaic generation system is connected with conventional electrical network, sharedPower supply task. In the time having sunlight, the DC inverter that inverter is sent out photovoltaic system becomes sinusoidal ac,The alternating current producing can directly be supplied with AC load, then by remaining electric energy input electrical network, or straightConnect the whole electric energy that produce are connected to the grid. There is no the solar time, load electricity consumption is all supplied with by electrical network.Because the light intensity moment is in changing, photovoltaic system receives the luminous energy utilizing also to be changed, thereby causesThe electric energy size producing neither be changeless, and AC load while normally working needed voltage beCertain, if photovoltaic system electricity can directly all be supplied with to AC load, may be because of voltage mistakeHigh or too low AC load is caused to infringement in various degree, shorten the service life of AC load.
Summary of the invention
For above-mentioned technical problem, the present invention has designed and developed a kind of grid-connected control system, and object existsIn the voltage swing of can Real-Time Monitoring inverter carrying, and corresponding large according to need to carrying of AC loadLittle voltage, reduces to greatest extent because carrying overtension or the too low infringement that AC load is caused, and prolongsThe service life of long AC load.
Technical scheme provided by the invention is:
A kind of grid-connected control system, comprising:
Photovoltaic module, its solar radiation energy by reception changes into high voltage direct current through high-frequency direct-current;
Inverter, its high voltage direct current inversion by described photovoltaic module output is sinusoidal ac;
AC load and electrical network, it receives the sinusoidal ac that described inverter is carried, and electrical network is born with exchangingBetween carrying, be provided with transformer;
Dsp controller, its input is electrically connected with the output of described inverter by voltage sample device,The output of described dsp controller is electrically connected with described AC load and electrical network respectively, described voltage sampleThe magnitude of voltage of the sinusoidal ac that described in device Real-time Collection, inverter is carried, and the magnitude of voltage collecting is passedDeliver to described dsp controller, magnitude of voltage and institute that described dsp controller is carried described voltage sample deviceState the required load voltage value of AC load and compare, described in the control of multiple function change-over switch, hand overCurrent load is communicated with electrical network.
Preferably, in described grid-connected control system, if the voltage that described voltage sample device is carriedValue is less than the required load voltage value of described AC load, described dsp controller is born with described interchangeThe first function change-over switch between carrying is communicated with, and connects between described dsp controller and described electrical network simultaneouslyThe second function change-over switch and electrical network and AC load between the 3rd function change-over switch, described changeDepressor under the effect of described dsp controller by load voltage value required described AC load and described electricityPress the difference of the magnitude of voltage of sampler conveying to be delivered to described AC load; If described voltage sample device is carriedMagnitude of voltage be greater than the required load voltage value of described AC load, by described dsp controller with described inThe first function change-over switch between AC load is communicated with, and connects described dsp controller and described electricity simultaneouslyThe second function change-over switch between net, disconnects the 3rd function change-over switch between electrical network and AC load,Unnecessary voltage is delivered in electrical network; If the magnitude of voltage that described voltage sample device is carried equals described interchangeThe load voltage value that load is required, by the first merit between described dsp controller and described AC loadCan change-over switch be communicated with, the second function simultaneously disconnecting between described dsp controller and described electrical network is switchedThe 3rd function change-over switch between switch and electrical network and AC load.
Preferably, in described grid-connected control system, the described first to the 3rd function change-over switchFor mechanical switch or electronic switch.
Preferably, in described grid-connected control system, described photovoltaic module comprises 40～50 tooSun energy battery, described solar cell package is in frame.
Preferably, in described grid-connected control system, every 5 of described solar cell is connected intoThe first solar battery group, every two the first solar battery group are also unified into the second solar battery group, everyTwo the second solar battery group are connected into the 3rd solar battery group, and described the 3rd solar battery group alsoBe unified into described photovoltaic module.
In grid-connected control system of the present invention, inversion described in described voltage sample device Real-time CollectionThe magnitude of voltage of the sinusoidal ac that device is carried, and the magnitude of voltage collecting is sent to described dsp controller,Required specified of the magnitude of voltage that described dsp controller is carried described voltage sample device and described AC loadMagnitude of voltage compares, and controls described the first function change-over switch, the second merit according to the size of the two differenceThe connection situation of energy change-over switch and the 3rd function change-over switch, carries thereby realize Real-Time Monitoring inverterVoltage swing, and according to the voltage that need to carry corresponding size of AC load, photovoltaic module is producedUnnecessary voltage input electrical network, and utilize electrical network to supply described photovoltaic module to be just not enough to support AC loadThe required voltage difference of normal work, reduces to greatest extent because carrying overtension or too low AC load being causedInfringement, extend service life of AC load. The solar cell of photovoltaic module adopts repeatedly series connection manyThe connected mode of inferior parallel connection, has improved the utilization rate of photovoltaic module to solar energy.
Brief description of the drawings
Fig. 1 is the schematic diagram of grid-connected control system of the present invention.
Detailed description of the invention
Below in conjunction with accompanying drawing, the present invention is described in further detail, to make those skilled in the art's referenceDescription word can be implemented according to this.
As shown in Figure 1, the invention provides a kind of grid-connected control system, comprising:
Photovoltaic module, its solar radiation energy by reception changes into high voltage direct current through high-frequency direct-current,A solar cell can only produce the voltage of about 0.5V, uses required voltage far below reality, forMeet the actual required voltage that uses, solar cell need to be connected into assembly;
Inverter, its high voltage direct current inversion by described photovoltaic module output is sinusoidal ac, due toWhat solar cell sent is direct current, and general load is AC load, so need inverter to incite somebody to actionThe high voltage direct current inversion of photovoltaic module output is sinusoidal ac;
AC load and electrical network, it receives the sinusoidal ac that described inverter is carried, and electrical network is born with exchangingBetween carrying, be provided with transformer, transformer carries out the voltage of electrical network output to flow to AC load after step-down;
Dsp controller, its input is electrically connected with the output of described inverter by voltage sample device,The output of described dsp controller is electrically connected with described AC load and electrical network respectively, described voltage sampleThe magnitude of voltage of the sinusoidal ac that described in device Real-time Collection, inverter is carried, and the magnitude of voltage collecting is passedDeliver to described dsp controller, magnitude of voltage and institute that described dsp controller is carried described voltage sample deviceState the required load voltage value of AC load and compare, described in the control of multiple function change-over switch, hand overCurrent load is communicated with electrical network, ensures the required rated voltage of the normal work of AC load.
In described grid-connected control system, if described voltage sample device carry magnitude of voltage be less than described inThe load voltage value that AC load is required, by between described dsp controller and described AC loadOne function change-over switch is communicated with, and connects the second function between described dsp controller and described electrical network simultaneouslyThe 3rd function change-over switch between change-over switch and electrical network and AC load, described transformer is describedUnder the effect of dsp controller, the output voltage of electrical network is carried out to step-down, and by required described AC loadThe difference of the magnitude of voltage that load voltage value and described voltage sample device are carried is delivered to described AC load, withEnsure voltage required when AC load is normally worked; If the magnitude of voltage that described voltage sample device is carried is greater thanThe load voltage value that described AC load is required, by between described dsp controller and described AC loadFirst function change-over switch be communicated with, connect second between described dsp controller and described electrical network simultaneouslyFunction change-over switch, disconnects the 3rd function change-over switch between electrical network and AC load, by unnecessary electricityPressure is delivered in electrical network, infringement AC load being produced to reduce overtension; If described voltage sampleThe magnitude of voltage that device is carried equals the required load voltage value of described AC load, by described dsp controllerAnd the first function change-over switch between described AC load is communicated with, disconnect simultaneously described dsp controller withThe 3rd function between the second function change-over switch between described electrical network and electrical network and AC load is switchedSwitch.
In described grid-connected control system, the described first to the 3rd function change-over switch is mechanical switchOr electronic switch.
In described grid-connected control system, described photovoltaic module comprises 40～50 solar cells,Described solar cell package is in frame, and frame is stainless steel frame, aluminium frame or nonmetal frame.
In described grid-connected control system, every 5 of described solar cell is connected into the first solar energyBattery pack, every two the first solar battery group are also unified into the second solar battery group, every two second tooSun can battery pack be connected into the 3rd solar battery group, and described the 3rd solar battery group is also unified into described lightPhotovoltaic assembly.
Although embodiment of the present invention are open as above, it is not restricted to description and enforcement sideListed utilization in formula, it can be applied to various applicable the field of the invention completely, for being familiar with abilityThe personnel in territory, can easily realize other amendment, therefore do not deviate from claim and etc. homotypeEnclose under limited universal, the present invention is not limited to specific details and illustrates here and the figure describingExample.
Claims (1)
1. a grid-connected control system, is characterized in that, comprising:
Photovoltaic module, its solar radiation energy by reception changes into high voltage direct current through high-frequency direct-current;
Inverter, its high voltage direct current inversion by described photovoltaic module output is sinusoidal ac;
AC load and electrical network, it receives the sinusoidal ac that described inverter is carried, electrical network and AC load itBetween be provided with transformer;
Dsp controller, its input is electrically connected with the output of described inverter by voltage sample device, described inThe output of dsp controller is electrically connected with described AC load and electrical network respectively, and described voltage sample device is adopted in real timeCollect the magnitude of voltage of the sinusoidal ac of described inverter conveying, and the magnitude of voltage collecting is sent to described DSPController, magnitude of voltage and described AC load that described dsp controller is carried described voltage sample device are requiredLoad voltage value compare, by the company of AC load described in the control of multiple function change-over switch and electrical networkLogical;
If the magnitude of voltage that described voltage sample device is carried is less than the required load voltage value of described AC load, willThe first function change-over switch between described dsp controller and described AC load is communicated with, described in connecting simultaneouslyThe second function change-over switch between dsp controller and described electrical network and described electrical network and described AC loadBetween the 3rd function change-over switch, described transformer under the effect of described dsp controller by described interchangeThe difference of the magnitude of voltage that the required load voltage value of load is carried with described voltage sample device is delivered to described interchangeLoad; If the magnitude of voltage that described voltage sample device is carried is greater than the required load voltage value of described AC load,The first function change-over switch between described dsp controller and described AC load is communicated with, connects institute simultaneouslyState the second function change-over switch between dsp controller and described electrical network, disconnect described electrical network and exchange with describedThe 3rd function change-over switch between load, is delivered to unnecessary voltage in electrical network; If described voltage sample deviceThe magnitude of voltage of carrying equals the required load voltage value of described AC load, by described dsp controller and instituteThe first function change-over switch of stating between AC load is communicated with, and disconnects described dsp controller and described electricity simultaneouslyThe 3rd function between the second function change-over switch between net and described electrical network and described AC load is switchedSwitch;
Wherein, the described first to the 3rd function change-over switch is mechanical switch or electronic switch;
Described photovoltaic module comprises 40～50 solar cells, and described solar cell package is in frame;
Every 5 of described solar cell is connected into the first solar battery group, every two the first solar battery groupAnd be unified into the second solar battery group, every two the second solar battery group are connected into the 3rd solar battery group,Described the 3rd solar battery group is also unified into described photovoltaic module.
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| CN201410127593.8A CN103986183B (en) | 2014-03-31 | 2014-03-31 | A kind of grid-connected control system |
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| CN201410127593.8A CN103986183B (en) | 2014-03-31 | 2014-03-31 | A kind of grid-connected control system |
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| CN103986183A CN103986183A (en) | 2014-08-13 |
| CN103986183B true CN103986183B (en) | 2016-05-11 |
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| CN108199411A (en) * | 2018-01-19 | 2018-06-22 | 湖州积微电子科技有限公司 | Solar energy loads alternating current feedback system |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101345500A (en) * | 2008-05-16 | 2009-01-14 | 广东志成冠军集团有限公司 | Photovoltaic power generation system with grid-connected generation, independent power generation and UPS function |
| CN101867217A (en) * | 2009-12-27 | 2010-10-20 | 陈立新 | Intelligent power supply inverter and control method |
| CN102222931A (en) * | 2011-04-19 | 2011-10-19 | 吉林省电力有限公司电力科学研究院 | Microgrid three-phase grid-connected inverter system and control method thereof |
| CN102983588A (en) * | 2012-11-14 | 2013-03-20 | 四川东方电气自动控制工程有限公司 | Photovoltaic grid-tied inversion system based on novel grid-tied control algorithm |
-
2014
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101345500A (en) * | 2008-05-16 | 2009-01-14 | 广东志成冠军集团有限公司 | Photovoltaic power generation system with grid-connected generation, independent power generation and UPS function |
| CN101867217A (en) * | 2009-12-27 | 2010-10-20 | 陈立新 | Intelligent power supply inverter and control method |
| CN102222931A (en) * | 2011-04-19 | 2011-10-19 | 吉林省电力有限公司电力科学研究院 | Microgrid three-phase grid-connected inverter system and control method thereof |
| CN102983588A (en) * | 2012-11-14 | 2013-03-20 | 四川东方电气自动控制工程有限公司 | Photovoltaic grid-tied inversion system based on novel grid-tied control algorithm |
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Effective date of registration: 20160322 Address after: 224005 Yancheng City Jiefang South Road, Jiangsu, No. 189 Applicant after: Yancheng Power Supply Company of Jiangsu Electric Power Company Applicant after: Binhai County Power Supply Company, Jiangsu Electric Power Co. Applicant after: The electric Industrial Co., Ltd. of strand intense source Applicant after: Jiangsu Electric Power Company Applicant after: State Grid Corporation of China Address before: 100031 Xicheng District West Chang'an Avenue, No. 86, Beijing Applicant before: State Grid Corporation of China Applicant before: Jiangsu Electric Power Company Applicant before: Binhai County Power Supply Company, Jiangsu Electric Power Co. Applicant before: The electric Industrial Co., Ltd. of strand intense source |
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