CN104660166A - Photovoltaic intelligent combiner box based on string MPPT power optimization and string monitoring - Google Patents
Photovoltaic intelligent combiner box based on string MPPT power optimization and string monitoring Download PDFInfo
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- CN104660166A CN104660166A CN201510073841.XA CN201510073841A CN104660166A CN 104660166 A CN104660166 A CN 104660166A CN 201510073841 A CN201510073841 A CN 201510073841A CN 104660166 A CN104660166 A CN 104660166A
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- 238000012544 monitoring process Methods 0.000 title claims abstract description 19
- 238000005457 optimization Methods 0.000 title claims abstract description 17
- 238000004891 communication Methods 0.000 claims abstract description 4
- 230000001012 protector Effects 0.000 claims description 7
- 238000012423 maintenance Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 9
- 230000005855 radiation Effects 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000010248 power generation Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 229910001218 Gallium arsenide Inorganic materials 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- UIPVMGDJUWUZEI-UHFFFAOYSA-N copper;selanylideneindium Chemical compound [Cu].[In]=[Se] UIPVMGDJUWUZEI-UHFFFAOYSA-N 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- APTZNLHMIGJTEW-UHFFFAOYSA-N pyraflufen-ethyl Chemical compound C1=C(Cl)C(OCC(=O)OCC)=CC(C=2C(=C(OC(F)F)N(C)N=2)Cl)=C1F APTZNLHMIGJTEW-UHFFFAOYSA-N 0.000 description 1
- 230000001172 regenerating effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- 238000013083 solar photovoltaic technology Methods 0.000 description 1
Classifications
-
- 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
-
- 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
Abstract
The invention provides a photovoltaic intelligent combiner box based on string MPPT power optimization and string monitoring. The intelligent combiner box comprises a maximum power point tracking module which is connected with positive electrodes of various shunt-wound photovoltaic battery strings, and a string monitoring circuit, wherein a fuse wire is arranged between the maximum power point tracking module and the string monitoring circuit; the string monitoring circuit is connected with a monitoring center through a communication interface; direct current voltage generated by the photovoltaic battery string passes through the maximum power point tracking module, and is then output to an inverter circuit module at the back end through a direct current output module. The intelligent combiner box is provided with an MPPT circuit in allusion to each photovoltaic battery string, power optimization in allusion to a single string can be performed to improve the power generating efficiency; the intelligent combiner box has a DC-DC intelligent boosting module and a string monitoring function, so that the intelligent combiner box can monitor working parameters of each string for timely prewarning, the cost of an inverter is reduced, and operation and maintenance are more convenient.
Description
Technical field
The present invention relates to solar-photovoltaic technology field, particularly a kind of photovoltaic intelligent header box monitored based on group string MPPT power optimization and group string.
Background technology
Increasingly serious along with Global climate change and problem of environmental pollution, green regenerative energy sources industry last decade is developed rapidly.Solar energy is a kind of renewable resource, and the solar cell technology utilizing photovoltaic effect to carry out generating electricity enjoys common people to pay close attention to.Solar cell is by the material that can produce photovoltaic effect, as the materials such as silicon, GaAs, indium selenium copper are made, light energy conversion can be become electric energy.At present, the photovoltaic module combined by multi-disc solar cell is widely used for building various photovoltaic generating system, or for building up energy saving and environment friendly building as constructure screen wall.
The I-V curve of solar cell as shown in Figure 1, solar cell is a nonlinear power supply, a constant pressure source is can be regarded as in underloaded situation, in heavy duty situation, can be regarded as a constant-current source, be exactly the maximum power working point P of solar cell at the intersection of constant pressure source and constant-current source
max.As can be seen, if ignore the impact of temperature, under different solar radiation conditions, P
maxcorresponding operating voltage U
msubstantially be a steady state value (a in corresponding diagram, b, c, d, e point), if the impedance of load can remain at U along with the change of solar radiation
mnear, the energy of solar cell just can pass to load with possible maximum power.But in photovoltaic system general in practical application, the impedance of load is generally constant, and so, U will be departed from working point during system works
m(a ' in corresponding diagram, b ', c ', d ', e '), now, the output of solar cell is not with maximum power output.
The battery pack connection in series-parallel that photovoltaic generating system is made up of multiple battery component forms, each battery component comprises multiple cell pieces of series connection, in a photovoltaic system, the parameter of each solar module is also incomplete same, the solar radiation condition be subject to also can be different, such as, in various degree dirty of assembly surface, the local shades that a variety of causes causes, assembly towards etc., these can cause the actual power generation of the group string of each solar module composition in photovoltaic system not identical, also be, real output and the theoretic peak power output of each solar panel string are discrepant.The actual power generation of photovoltaic system and system effectiveness have very direct relation, in theory, the generating efficiency of photovoltaic system generally about 80%, and according to the statistics of reality, even if in the good west area of light radiation condition, the average system efficiency of photovoltaic system is only 74%.
In order to address this problem, most widely used is at present in photovoltaic generating system, use MPPT maximum power point tracking (MPPT) circuit.Common MPPT circuit and inverter are integrally arranged in inverter cabinet, in arranging like this, MPPT circuit can only adjust the power output of whole photovoltaic system, each solar panel string cannot adjust the power output of each battery pack string in system, so can not ensure with maximum power output; As long as there are differences between the output of each group string, will interact between group string, output voltage will be limited in one lower numerically (wooden pail effect), causes the loss of energy, and the difference of group string is larger, and this energy loss is larger.In addition, the otherness between serious group string can cause local hot spot, the global reliability of influential system.In order to give full play to the power output of each assembly, the producer having some external arranges a small-sized MPPT tracking circuit in each assembly correspondence, and this set high cost, is not suitable for applying in large-sized photovoltaic system.
In addition, in existing photovoltaic system, the DC-DC boost module of system and system-monitoring module are all be integrated in inverter, for power station developer, when carrying out system and installing, expensive photovoltaic system special inverter can only be selected, choice is little, and cost is higher.
Summary of the invention
In view of the defect of existence of the prior art, the present invention proposes a kind of photovoltaic intelligent header box monitored based on group string MPPT power optimization and group string, it can realize being optimized adjustment, the operating state of each group string of simultaneous real-time monitoring to the power output of each group string in system; The demand of photovoltaic system inverter can be made in addition to reduce, be beneficial to the cost that power station developer reduces system.
To achieve the object of the present invention, concrete, a kind of photovoltaic intelligent header box based on group string MPPT power optimization and the monitoring of group string of the present invention comprises, the MPPT maximum power point tracking module be connected with the photovoltaic cell group string of each parallel connection and organizing goes here and there supervisory circuit, described MPPT maximum power point tracking module and group are gone here and there between supervisory circuit and are provided with fusible link, and described group of string supervisory circuit is connected with Surveillance center by communication interface; The direct voltage that photovoltaic cell group string produces exports the inverter circuit module of rear end to after above-mentioned MPPT maximum power point tracking module by direct current output module.
Preferably, described intelligent junction box also comprises the Surge Protector be arranged between MPPT maximum power point tracking module and direct current output module.
Preferred again, be provided with fusible link between the negative pole of described Surge Protector and each photovoltaic cell group string.
Preferred again, described supervisory circuit comprises voltage, electric current, temperature, lightning protection state and the fusible link condition monitoring of each group string.
Preferred again, described supervisory circuit also comprises alarm module.
Intelligent junction box of the present invention arranges a road MPPT circuit in each photovoltaic cell group string correspondence, can carry out power optimization for single string group string, promotes generating efficiency; Carry DC-DC intelligently voltage boosting module and group string monitoring function, can monitor the timely early warning of running parameter of each group string, reduce the cost of inverter, operation maintenance is more convenient.
Accompanying drawing explanation
By the detailed description below in conjunction with accompanying drawing, aforesaid and other object, the feature and advantage of the present invention will become apparent.Wherein:
Figure 1 shows that the I-V curve synoptic diagram of solar cell;
Figure 2 shows that the structure composed schematic diagram of the photovoltaic generating system utilizing photovoltaic intelligent header box of the present invention;
Figure 3 shows that the structure composed schematic diagram of the photovoltaic intelligent header box of one embodiment of the invention;
Figure 4 shows that the structure composed schematic diagram of the photovoltaic intelligent header box of another embodiment of the present invention.
Embodiment
By feature of the present invention and advantage, details are as follows by reference to the accompanying drawings.
The structure composed schematic diagram of photovoltaic generating system shown in Figure 2, it comprises multiple photovoltaic cell group strings 10 of connection parallel with one another, the intelligent junction box 20 be connected with photovoltaic cell group string 10, and the inverter 30 to be connected with header box, described photovoltaic generating system and electrical network carry out being connected or powering to load as stand alone generating system.
A kind of structure composed schematic diagram based on organizing the photovoltaic intelligent header box 20 of going here and there MPPT power optimization and organizing string monitoring of one embodiment of the invention as shown in Figure 3, described intelligent junction box comprises MPPT maximum power point tracking (MPPT) module that is connected with the photovoltaic cell group string of each parallel connection and organizes goes here and there supervisory circuit, described MPPT maximum power point tracking module and group are gone here and there between supervisory circuit and are provided with fusible link, and described group of string supervisory circuit is connected with Surveillance center by communication interface; The direct voltage that photovoltaic cell group string produces exports the inverter circuit module of rear end to after above-mentioned MPPT maximum power point tracking module by direct current output module.
Be illustrated in figure 4 a kind of based on group string MPPT power optimization and the structure composed schematic diagram organizing the photovoltaic intelligent header box 20 ' that string is monitored of another embodiment of the present invention; described intelligent junction box also comprises the Surge Protector be arranged between MPPT maximum power point tracking module and direct current output module; described Surge Protector can photovoltaic system meet with thunderbolt time with ground conducting, the system failure that avoiding is struck by lightning causes.In a preferred embodiment, fusible link is provided with between the negative pole of described Surge Protector and each photovoltaic cell group string.
Fusible link in above-described embodiment can prevent electric current from pouring in down a chimney and cause damage to photovoltaic module, and when electric current pours in down a chimney, fusible link can disconnect.
In preferred embodiments, described supervisory circuit comprises the voltage of each group string, electric current, temperature, lightning protection state and fusible link condition monitoring, when there is abnormal accident, can notify staff by alarm module immediately, be beneficial to staff overhaul system, avoid causing larger accident.
Intelligent junction box of the present invention arranges a road MPPT circuit in each photovoltaic cell group string correspondence, power optimization can be carried out for single string group string, when organizing string and running into shade or the situation such as to block, carry out the crosstalk of power optimization lifting group by MPPT module and be depressed into more voltage levels, reduce the power station power generation loss that power station is caused because of environment or human factor, promote generating efficiency; Due to header box carry DC ?DC intelligently voltage boosting module, the inverter of rear end can save DC ?DC module, greatly reduce contravariant equipment system cost, simultaneously for power station developer, the selection face of inverter is wider, inverter be merely Zhi Liu ?AC power conversion, inverter is not limited to photovoltaic special inverter, efficiency is higher, volume is less, select face wider, and cost is lower; Intelligent junction box, with group string monitoring function, can monitor the voltage of each group string, electric current, temperature, lightning protection state, fusible link state, when there being assembly to go wrong, system meeting and alarm, power station operator on duty is according to screen display state investigation fault group string problem, and O&M is convenient.
The present invention is not limited to described embodiment, and those skilled in the art, not departing from spirit of the present invention namely openly in scope, still can do some and revise or change, therefore the scope that the scope of the present invention limits with claims is as the criterion.
Claims (5)
1. the photovoltaic intelligent header box monitored based on group string MPPT power optimization and group string, it is characterized in that, described intelligent junction box comprises the MPPT maximum power point tracking module that is connected with the photovoltaic cell group string of each parallel connection and organizes goes here and there supervisory circuit, described MPPT maximum power point tracking module and group are gone here and there between supervisory circuit and are provided with fusible link, and described group of string supervisory circuit is connected with Surveillance center by communication interface; The direct voltage that photovoltaic cell group string produces exports the inverter circuit module of rear end to after above-mentioned MPPT maximum power point tracking module by direct current output module.
2. a kind of based on group string MPPT power optimization and the photovoltaic intelligent header box organizing string monitoring as claimed in claim 1, it is characterized in that, described intelligent junction box also comprises the Surge Protector be arranged between MPPT maximum power point tracking module and direct current output module.
3. a kind of based on group string MPPT power optimization and the photovoltaic intelligent header box organizing string monitoring as claimed in claim 2, it is characterized in that, between the negative pole of described Surge Protector and each photovoltaic cell group string, be provided with fusible link.
4. as claimed in claim 1 a kind of based on group string MPPT power optimization and group string monitoring photovoltaic intelligent header box, it is characterized in that, described supervisory circuit comprise each group string voltage, electric current, temperature, the monitoring of lightning protection state and fusible link state.
5. a kind of based on group string MPPT power optimization and the photovoltaic intelligent header box organizing string monitoring as claimed in claim 4, it is characterized in that, described supervisory circuit also comprises alarm module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510073841.XA CN104660166A (en) | 2015-02-12 | 2015-02-12 | Photovoltaic intelligent combiner box based on string MPPT power optimization and string monitoring |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510073841.XA CN104660166A (en) | 2015-02-12 | 2015-02-12 | Photovoltaic intelligent combiner box based on string MPPT power optimization and string monitoring |
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| CN104660166A true CN104660166A (en) | 2015-05-27 |
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| CN201510073841.XA Pending CN104660166A (en) | 2015-02-12 | 2015-02-12 | Photovoltaic intelligent combiner box based on string MPPT power optimization and string monitoring |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105634401A (en) * | 2015-08-30 | 2016-06-01 | 苏州快可光伏电子股份有限公司 | Integrated photovoltaic power station combiner box control module |
| CN106712096A (en) * | 2017-02-08 | 2017-05-24 | 浙江佳明天和缘光伏科技有限公司 | Photovoltaic power generation monitoring system based on string cable communication and single-point current detection |
| CN106953591A (en) * | 2017-03-21 | 2017-07-14 | 华电电力科学研究院 | A kind of photovoltaic plant increment life insurance structure and its increment life insurance method |
| CN110347185A (en) * | 2018-04-08 | 2019-10-18 | 房程远 | Photovoltaic plant comprehensive automation management system |
| CN112367039A (en) * | 2020-11-09 | 2021-02-12 | 华北电力科学研究院有限责任公司 | Intelligent header box |
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| CN204442274U (en) * | 2015-02-12 | 2015-07-01 | 苏州快可光伏电子股份有限公司 | A kind of photovoltaic intelligent header box monitored based on group string MPPT power optimization and group string |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105634401A (en) * | 2015-08-30 | 2016-06-01 | 苏州快可光伏电子股份有限公司 | Integrated photovoltaic power station combiner box control module |
| CN106712096A (en) * | 2017-02-08 | 2017-05-24 | 浙江佳明天和缘光伏科技有限公司 | Photovoltaic power generation monitoring system based on string cable communication and single-point current detection |
| CN106953591A (en) * | 2017-03-21 | 2017-07-14 | 华电电力科学研究院 | A kind of photovoltaic plant increment life insurance structure and its increment life insurance method |
| CN106953591B (en) * | 2017-03-21 | 2023-11-21 | 华电电力科学研究院有限公司 | Photovoltaic power station power generation increasing structure and power generation increasing method thereof |
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Application publication date: 20150527 |