CN104578138A - Distributed photovoltaic grid-connected power generation system - Google Patents
Distributed photovoltaic grid-connected power generation system Download PDFInfo
- Publication number
- CN104578138A CN104578138A CN201310520257.5A CN201310520257A CN104578138A CN 104578138 A CN104578138 A CN 104578138A CN 201310520257 A CN201310520257 A CN 201310520257A CN 104578138 A CN104578138 A CN 104578138A
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- photovoltaic
- grid
- management control
- voltage
- control system
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- 238000010248 power generation Methods 0.000 title abstract 7
- 210000004027 cell Anatomy 0.000 claims description 19
- 238000006243 chemical reaction Methods 0.000 claims description 6
- 210000003850 cellular structure Anatomy 0.000 claims description 3
- 229910021421 monocrystalline silicon Inorganic materials 0.000 claims description 3
- 230000001105 regulatory effect Effects 0.000 abstract 1
- 239000013589 supplement Substances 0.000 abstract 1
- 230000010354 integration Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000001502 supplementing effect Effects 0.000 description 3
- 230000007812 deficiency Effects 0.000 description 2
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
Classifications
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- H02J3/383—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
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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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- Photovoltaic Devices (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention discloses a distributed photovoltaic grid-connected power generation system. The system comprises a photovoltaic power generation system which consists of a plurality of photovoltaic power generation subsystems in parallel connection, and a management control system, wherein each photovoltaic power generation subsystem comprises a photovoltaic battery panel array, a combiner box, a grid -connected inverter, an on-load tap changing transformer and a voltage regulator which are successively connected, the combiner box and the management control system are connected with a storage battery through a charging switch, the voltage regulator and the management control system are connected with an alternating-current power grid through a distribution switch, the input terminal of the alternating-current power grid is connected with a load, and the management control system is connected with a human machine interface (HMI). The distributed photovoltaic grid-connected power generation system disclosed by the invention has the advantages that the voltage excursion is controlled within a certain range, and the voltage is regulated, so that the stability of the voltage is guaranteed; besides, the solar energy is converted into the electric energy, so that effective supplement is provided to the regular power grid energy, and the power generation system is clean and energy-saving; the human machine interface is adopted to monitor the system in real time, so that the safety and the operating efficiency of the system are improved.
Description
Technical field
The present invention relates to a kind of electricity generation system, especially relate to a kind of distributed photovoltaic grid-connected system.
Background technology
Along with the develop rapidly of human civilization, lack of energy and environmental pollution states are day by day serious in recent years, and regenerative resource receives global concern gradually.Solar energy is inexhaustible clean energy resource, the photovoltaic generation industry utilizing solar energy also attention naturally.Solar energy power generating industry one of fastest-rising new high-tech industry in the world since being the eighties in 20th century, photovoltaic generating system is divided into independent photovoltaic generating system and the large class of grid-connected photovoltaic system two usually, China is in photovoltaic generation initial stage at present, and grid-connected photovoltaic system will be following development trend.Grid-connected photovoltaic system can be divided into again centralized photovoltaic plant and distributed photovoltaic power station according to the mode accessed and scale.Centralized photovoltaic plant utilizes Desert Area to enrich and metastable solar energy resources mostly, the grid-connected supply distant loads of access high voltage power transmisson system; Distributed photovoltaic power station is mainly used in the electrical problem solving user nearby, and realized the compensation of power supply difference by grid-connected and sent outside, general single station capacity is less, is usually incorporated in low-voltage network.At present due to the encouragement of the policies of various countries, the distributed photovoltaic market share much larger than centralized, will have vast potential for future development.
Existing grid-connected photovoltaic system mainly adopts the compositions such as solar photovoltaic cell panel, controller, inverter and storage battery, the main deficiency existed in such system is complex structure between solar photovoltaic cell panel and inverter, therefore installation cost is high, next is existing inverter unstable properties, easy infringement, useful life is not long, thus have influence on whole electricity generation system stable, run normally; Moreover directly send AC network to through the voltage of inverter, cause the large unstable impact of mains voltage range fluctuation, therefore need to be improved.
Summary of the invention
Technical problem to be solved by this invention is for above-mentioned deficiency of the prior art, a kind of distributed photovoltaic grid-connected system is provided, the header box that the direct current that photovoltaic cell plate array is changed can conflux by its application connects photovoltaic cell plate array and combining inverter, and apply on-load tap-changing transformer and voltage regulator variation is controlled within the specific limits and regulates voltage, the voltage fluctuation and flicker caused when reducing a large amount of grid integration, ensure that the stability of voltage, its structure is simple, reasonable in design, can enhance productivity; Convert solar energy to electric energy, carried out effectively supplementing to the normal grid energy, clean energy-saving; Adopt man-machine interface to monitor in real time system, improve fail safe and the operational efficiency of system.
For solving the problems of the technologies described above, the technical solution used in the present invention is: a kind of distributed photovoltaic grid-connected system, it is characterized in that: comprise photovoltaic generating system and management control system, described photovoltaic generating system is made up of the photovoltaic generation subsystem of multiple parallel connection, described photovoltaic generation subsystem comprises the photovoltaic cell plate array that solar energy can be converted to direct current energy connected successively, the header box that the direct current that photovoltaic cell plate array is changed can be confluxed, DC power conversion after header box can being confluxed becomes the combining inverter of alternating current, alternating current voltage skew after combining inverter can being changed control at the on-load tap-changing transformer of certain limit and the voltage regulator that can regulate voltage, the charge switch whether described header box and management control system all charge by controlling storage battery connects with storage battery, whether described voltage regulator and management control system be all by controlling to be that the panel switches that AC network is powered connect with AC network, described AC network output is connected to load, described management control system also connects with Human machine interface.
Above-mentioned a kind of distributed photovoltaic grid-connected system, is characterized in that: described load comprises illuminating lamp, electrical equipment or other loads.
Above-mentioned a kind of distributed photovoltaic grid-connected system, is characterized in that: the monocrystalline silicon photovoltaic cell component that described photovoltaic cell plate array is 15% by photoelectric conversion efficiency is formed.
Above-mentioned a kind of distributed photovoltaic grid-connected system, is characterized in that: the rated capacity of described combining inverter is 5kW, and its direct voltage input range is 300V ~ 650V.
The present invention compared with prior art has the following advantages:
1, combining inverter is connected after adopting header box the direct current that photovoltaic cell plate array is changed can be confluxed.
2, variation controls within the specific limits and regulates voltage by application on-load tap-changing transformer and voltage regulator, and when reducing a large amount of grid integration, the voltage fluctuation and flicker caused, ensure that the stability of voltage.
3, convert solar energy to electric energy, carried out effectively supplementing to the normal grid energy, clean energy-saving.
4, adopt man-machine interface to monitor in real time system, improve fail safe and the operational efficiency of system.
In sum, the header box that the direct current that photovoltaic cell plate array is changed can conflux by the present invention's application connects photovoltaic cell plate array and combining inverter, and apply on-load tap-changing transformer and voltage regulator variation is controlled within the specific limits and regulates voltage, the voltage fluctuation and flicker caused when reducing a large amount of grid integration, ensure that the stability of voltage; Convert solar energy to electric energy, carried out effectively supplementing to the normal grid energy, clean energy-saving; Adopt man-machine interface to monitor in real time system, improve fail safe and the operational efficiency of system, its structure is simple, reasonable in design, can enhance productivity.
Below by drawings and Examples, technical scheme of the present invention is described in further detail.
Accompanying drawing explanation
Fig. 1 is structured flowchart of the present invention.
Description of reference numerals:
1-management control system; 2-photovoltaic generation subsystem; 3-photovoltaic cell plate array;
4-header box; 5-combining inverter; 6-on-load tap-changing transformer;
7-voltage regulator; 8-charge switch; 9-storage battery;
10-panel switches; 11-AC network; 12-load;
13-Human machine interface.
Embodiment
A kind of distributed photovoltaic grid-connected system as shown in Figure 1, comprise photovoltaic generating system and management control system 1, described photovoltaic generating system is made up of the photovoltaic generation subsystem 2 of multiple parallel connection, described photovoltaic generation subsystem 2 comprises the photovoltaic cell plate array 3 that solar energy can be converted to direct current energy connected successively, the header box 4 that the direct current that photovoltaic cell plate array 3 is changed can be confluxed, DC power conversion after header box 4 can being confluxed becomes the combining inverter 5 of alternating current, alternating current voltage skew after combining inverter 5 can being changed controls at the on-load tap-changing transformer 6 of certain limit and the voltage regulator 7 that can regulate voltage, the charge switch 8 whether described header box 4 and management control system 1 all charge by controlling storage battery connects with storage battery 9, whether described voltage regulator 7 and management control system 1 be all by controlling to be that the panel switches 10 that AC network is powered connect with AC network 11, described AC network 11 output is connected to load 12, described management control system 1 also connects with Human machine interface 13.
As shown in Figure 1, in the present embodiment, described load 12 comprises illuminating lamp, electrical equipment or other loads.
As shown in Figure 1, in the present embodiment, the monocrystalline silicon photovoltaic cell component that described photovoltaic cell plate array 3 is 15% by photoelectric conversion efficiency is formed.
As shown in Figure 1, in the present embodiment, the rated capacity of described combining inverter 5 is 5kW, and its direct voltage input range is 300V ~ 650V.
Operation principle of the present invention is: solar energy is converted to direct current energy by photovoltaic cell plate array 3, send to after all direct currents that photovoltaic cell plate array 3 is changed by junction station 4 conflux and there is certain antijamming capability, the combining inverter 5 that wave distortion is little and power factor (PF) is high, through on-load tap-changing transformer 6 and voltage regulator, alternating current voltage skew is controlled within the specific limits after direct current is converted to alternating current by combining inverter 5, and regulate, the voltage fluctuation and flicker caused when reducing a large amount of grid integration, multiple photovoltaic generation subsystem 2 sends electric current to AC network 11 for customer power supply by panel switches 10 jointly afterwards, wherein send storage battery 9 to by charge switch 8 charge through header box 4 after-current that confluxes, whether staff is charged by man-machine interface 13 control and management control system 1 pair of storage battery and whether AC network powers controls, when management control system 1 judges storage battery quantity not sufficient, disconnect panel switches 10 to change civil power into for AC network 11 power solar powered for use, and use solar energy to charge for storage battery 9 by connecting charge switch 8, when storage battery 9 electricity is full of, management control system 1 turn off charge switch 8 and connect panel switches 10 and use solar energy to pass through AC network 11 for customer power supply.
The above; it is only preferred embodiment of the present invention; not the present invention is imposed any restrictions, every above embodiment is done according to the technology of the present invention essence any simple modification, change and equivalent structure change, all still belong in the protection range of technical solution of the present invention.
Claims (4)
1. a distributed photovoltaic grid-connected system, it is characterized in that: comprise photovoltaic generating system and management control system (1), described photovoltaic generating system is made up of the photovoltaic generation subsystem (2) of multiple parallel connection, described photovoltaic generation subsystem (2) comprises the photovoltaic cell plate array (3) that solar energy can be converted to direct current energy connected successively, the header box (4) that the direct current that photovoltaic cell plate array (3) change can be confluxed, DC power conversion after header box (4) can being confluxed becomes the combining inverter (5) of alternating current, alternating current voltage skew after combining inverter (5) can being changed control at the on-load tap-changing transformer (6) of certain limit and the voltage regulator (7) that can regulate voltage, the charge switch (8) whether described header box (4) and management control system (1) all charge by controlling storage battery connects with storage battery (9), whether described voltage regulator (7) and management control system (1) be all by controlling to be that the panel switches (10) that AC network is powered connect with AC network (11), described AC network (11) output is connected to load (12), described management control system (1) also connects with Human machine interface (13).
2. according to a kind of distributed photovoltaic grid-connected system according to claim 1, it is characterized in that: described load (12) comprises illuminating lamp, electrical equipment or other loads.
3. according to a kind of distributed photovoltaic grid-connected system according to claim 1, it is characterized in that: the monocrystalline silicon photovoltaic cell component that described photovoltaic cell plate array (3) is 15% by photoelectric conversion efficiency is formed.
4. according to a kind of distributed photovoltaic grid-connected system described in claim 1 or 3, it is characterized in that: the rated capacity of described combining inverter (5) is 5kW, and its direct voltage input range is 300V ~ 650V.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310520257.5A CN104578138A (en) | 2013-10-28 | 2013-10-28 | Distributed photovoltaic grid-connected power generation system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310520257.5A CN104578138A (en) | 2013-10-28 | 2013-10-28 | Distributed photovoltaic grid-connected power generation system |
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| CN104578138A true CN104578138A (en) | 2015-04-29 |
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| CN201310520257.5A Pending CN104578138A (en) | 2013-10-28 | 2013-10-28 | Distributed photovoltaic grid-connected power generation system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105162406A (en) * | 2015-10-26 | 2015-12-16 | 苏州华安普电力科技股份有限公司 | Distributed roof grid-connected photovoltaic power generation system |
| CN116131347A (en) * | 2023-04-13 | 2023-05-16 | 国网山东省电力公司平度市供电公司 | Intelligent control-based photovoltaic grid-connected inverter and photovoltaic grid-connected system |
-
2013
- 2013-10-28 CN CN201310520257.5A patent/CN104578138A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105162406A (en) * | 2015-10-26 | 2015-12-16 | 苏州华安普电力科技股份有限公司 | Distributed roof grid-connected photovoltaic power generation system |
| CN105162406B (en) * | 2015-10-26 | 2018-05-15 | 苏州华安普电力科技股份有限公司 | A kind of distribution roof grid-connected photovoltaic system |
| CN116131347A (en) * | 2023-04-13 | 2023-05-16 | 国网山东省电力公司平度市供电公司 | Intelligent control-based photovoltaic grid-connected inverter and photovoltaic grid-connected system |
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Application publication date: 20150429 |