CN202906789U - A distributed photovoltaic system - Google Patents
A distributed photovoltaic system Download PDFInfo
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- CN202906789U CN202906789U CN2012202871554U CN201220287155U CN202906789U CN 202906789 U CN202906789 U CN 202906789U CN 2012202871554 U CN2012202871554 U CN 2012202871554U CN 201220287155 U CN201220287155 U CN 201220287155U CN 202906789 U CN202906789 U CN 202906789U
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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
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Abstract
The utility model discloses a distributed photovoltaic system comprising a photovoltaic array formed by more than one photovoltaic array unit connected in parallel. The photovoltaic array unit comprises more than one battery assembly connected in series, an inverter connected with the photovoltaic array in series, and a power supply optimizer connected with the battery assembly. When an individual battery board generates a problem of mismatch, the distributed photovoltaic system guarantees every battery board to still output the largest electric power and reduces generating capacity loss caused by the mismatch to the utmost extent.
Description
Technical field
The utility model relates to technical field of solar utilization technique, especially relates to a kind of distributed photovoltaic system.
Background technology
At present, the user who solar energy photovoltaic system much is installed has recognized part or the intermittent energy output that can have influence on system that covers.Nowadays the solar energy system of installing, what generally adopt is centralized MPPT system, can not cause in the solar panel power loss inhomogeneous because the cell panel that shade or other factors cause does not mate, wherein 10% shade just may cause the loss in institute capacitation source 50%.Some commerce and dwelling house facility fail to give full play to the potentiality of its energy output, do not cause energy output undesirable because cell panel does not mate, and cause some sundry items to be abandoned.In essence, exist intrinsic space utilization deficiency and the energy that not enough problem is provided.
Distributed MPPT(DMPPT) function, the output of every photovoltaic panel of separate compensation; Centralized MPPT scheme then is the compensate function to whole electro-optical package arrayed applications one " best fit ".Owing to be not subjected to the impact of adjacent block performance, even if there is a module to lose efficacy, the power output of every solar panel is maximizing still, so DMPPT improves the most promising technology of solar power system production of energy rate.
In the unified situation of radiation, temperature and other battery parameter, except conversion efficiency difference, there is not difference between the performance of distributed MPPT and centralized MPPT.Yet, existing in the situation of local shade, cell panel does not mate will become maximum problem.Because parameter disunity, local shade will cause the different cell panels of array to have a plurality of MPP.The single MPP of battery is the function of the exponential relationship between electric current and the voltage.When adopting centralized MPPT technology, may cause more inhomogeneous loss.This is owing to following two reasons: at first, centralized MPPT is inner chaotic, rests on local peak when carrying out power configuration, and is arranged on the inferior advantage of voltage; Secondly, under improper condition, the electrical voltage point difference of MPP may be very large, exceeded working range and the voltage range of centralized MPPT.Because the difference between the cell panel is very large, just in these cases, adopt the power supply optimizer of distributed MPPT can independently strengthen and improve the performance of cell panel.Photovoltaic system is in actual application environment, indivedual or part assembly in the array because blocked, dust, birds ight soil, various Changes in weather, array causes entire system power output this problem that descends towards, assembly inconsistency etc., when adopting centralized MPPT technology, may cause more inhomogeneous loss.The configuration of being incorporated into the power networks of the standard of centralized maximum power point tracking system (MPPT) function, two cell panel cresteds of one of them group row.Centralized MPPT can't arrange direct voltage, therefore can't make the power output of two group row all reach maximum.At the High Level DC Voltage point, MPPT makes the power output of not covering the group row reach maximum.At the low dc voltage point, MPPT will make the power output of covering group row reach maximum: bypass diode is walked around and is covered cell panel, not the covering cell panel the full dose electric current will be provided of this group row.A plurality of MPP of array may cause concentrating the extraneoas loss of MPPT maximum power point tracking (MPPT) configuration, stop at local maximum point place because the MPPT maximum power point tracking device may obtain error message, and are stabilized in the inferior advantage with V-P feature.Different case study and on-the-spot test prove, part is covered energy output to photovoltaic system and had and seriously influence.By using distributed MPPT control can alleviate the adverse effect of covering system.
The utility model content
The purpose of this utility model overcomes the deficiencies in the prior art exactly, and a kind of distributed photovoltaic system that optimizes with the distributed power source optimizer is provided.When native system can mismatch problems appears in other cell panels in photovoltaic array, keep every cell panel still can export maximum electric power, reduce as far as possible the energy output loss that mismatch is brought.
In order to achieve the above object, adopt following technical scheme:
The photovoltaic array that the photovoltaic array unit that is connected by a more parallel forms, described photovoltaic array comprises the battery component that is connected in series more than in the unit; The inverter that is connected in series with photovoltaic array; The power supply optimizer that is connected with battery component.
Further, a described battery component and a power supply optimizer consist of an assembly optimiser unit, and the assembly optimiser unit is connected in series and forms the photovoltaic array unit.
Further, described power supply optimizer comprise for the voltage of rising photovoltaic array and export to inverter the DC/DC unit, be used for determining the MPPT control unit of photovoltaic array maximum power working point, for detection of the input detection unit of the electric current of power supply optimizer input and voltage, for detection of the output detections unit of the electric current of power supply optimizer output and voltage be used for component states monitor unit with computer communication.
Compared with prior art, the beneficial effects of the utility model are:
The utility model is connected in series a power supply optimizer on each battery component, be used for the energy output of each battery component of control photovoltaic array.The power supply optimizer carries out dual tracking: on the one hand, they follow the tracks of best local MPP; On the other hand, they are different output voltage or electric currents with input voltage or current conversion, transmit with the energy in the to greatest extent raising system.This distributed photovoltaic power system has efficient integrated power circuit, adopts the maximum power point algorithm that improves to greatest extent each photovoltaic array power output.Therefore, the photovoltaic array unit has identical output current, has greatly reduced the hot spot problem and has avoided adopting the internal by-pass pattern.Each power supply optimizer will be regulated its output voltage to meet whole bus voltage.Consequently whole photovoltaic system will present the IV curve with single largest power points, simplify the operation of central inverter, and reduce as far as possible the energy output loss that mismatch is brought.
Description of drawings
Fig. 1 is distributed photovoltaic described in the utility model system.
Fig. 2 is the structural representation of power supply optimizer described in the utility model.
Diagram: 1-photovoltaic array; 2-photovoltaic array unit; The 3-battery component; 4-power supply optimizer;
The 41-DC/DC unit; The 42-input detection unit; The 43-MPPT control unit; 44-output detections unit;
45-component states monitor unit; 5-inverter.
Embodiment
Below in conjunction with specific embodiment, the utility model is described further:
See also Fig. 1, the utility model comprises photovoltaic array 1 and inverter 5.Wherein, comprise the photovoltaic array unit 2 that several are parallel with one another in the photovoltaic array.Comprise a plurality of battery components that are connected in series 3 in the photovoltaic array unit 2.Wherein each battery component 3 connects a power supply optimizer 4, a battery component 3 and a power supply optimizer 4 have formed an assembly optimiser unit, a plurality of assembly optimiser unit are cascaded and have consisted of photovoltaic array unit 2, a plurality of photovoltaic arrays unit 2 is connected in parallel and forms photovoltaic array 1, and photovoltaic array 1 and inverter 5 are connected in series and have formed distributed photovoltaic described in the utility model system.
See also Fig. 2, described power supply optimizer comprises DC/DC unit 41, input detection unit 42, MPPT control unit 43, output detections unit 44, component states monitor unit 45.MPPT control unit 43 adopts the maximum power point algorithm that improves to greatest extent each photovoltaic array power output, has greatly reduced the hot spot problem and has adopted the internal by-pass pattern, reduces as far as possible the energy output loss that mismatch is brought.Input detection unit 42 is by detecting electric current and the voltage of power supply optimizer 4 inputs, the output detections unit is by detecting electric current and the voltage of power supply optimizer 4 outputs, after the comparison operation through MPPT control unit 43, control DC/DC adjusts the unit output voltage and the electric current of battery component 3, make battery component 3 reach maximum power output, make photovoltaic array unit 2 have identical output current, power supply optimizer 4 is regulated its output voltage to meet whole bus voltage.Input electric current and the voltage of power supply optimizer, the data values such as the electric current of output and voltage are by component states monitor unit 45 and computer communication, and uploading data to computer is further analyzed.
Claims (3)
1. distributed photovoltaic system is characterized in that comprising:
The photovoltaic array that the photovoltaic array unit that is connected by a more parallel forms, described photovoltaic array comprises the battery component that is connected in series more than in the unit;
The inverter that is connected in series with photovoltaic array;
One with the power source optimizer, and described power supply optimizer and battery component connect one to one.
2. distributed photovoltaic according to claim 1 system, it is characterized in that: a described battery component and a power supply optimizer consist of an assembly optimiser unit, and the assembly optimiser unit is connected in series and forms the photovoltaic array unit.
3. distributed photovoltaic according to claim 1 system is characterized in that:
Described power supply optimizer comprises for the voltage of rising photovoltaic array and exports the DC/DC unit of inverter to that its two ends connect respectively input and the output of power supply optimizer;
Be used for determining the MPPT control unit of photovoltaic array maximum power working point, its connection and control DC/DC unit;
For detection of the electric current of power supply optimizer input and the input detection unit of voltage, measurement data feeds back to the MPPT control unit;
For detection of the electric current of power supply optimizer output and the output detections unit of voltage, measurement data feeds back to the MPPT control unit;
Connect the MPPT control unit, be used for the component states monitor unit with computer communication.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202871554U CN202906789U (en) | 2012-06-18 | 2012-06-18 | A distributed photovoltaic system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2012202871554U CN202906789U (en) | 2012-06-18 | 2012-06-18 | A distributed photovoltaic system |
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| CN202906789U true CN202906789U (en) | 2013-04-24 |
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| CN2012202871554U Expired - Fee Related CN202906789U (en) | 2012-06-18 | 2012-06-18 | A distributed photovoltaic system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105446414A (en) * | 2016-01-25 | 2016-03-30 | 常熟理工学院 | Photovoltaic array topology and maximum power tracking control method thereof |
| US10199832B2 (en) | 2015-04-28 | 2019-02-05 | First Solar, Inc. | Photovoltaic DC power distribution system |
-
2012
- 2012-06-18 CN CN2012202871554U patent/CN202906789U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US10199832B2 (en) | 2015-04-28 | 2019-02-05 | First Solar, Inc. | Photovoltaic DC power distribution system |
| CN105446414A (en) * | 2016-01-25 | 2016-03-30 | 常熟理工学院 | Photovoltaic array topology and maximum power tracking control method thereof |
| CN105446414B (en) * | 2016-01-25 | 2017-03-08 | 常熟理工学院 | The maximum power tracking and controlling method of photovoltaic array topology |
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Legal Events
| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20130424 Termination date: 20160618 |
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| CF01 | Termination of patent right due to non-payment of annual fee |