CN104320072A - Power generation unit and photovoltaic power station - Google Patents
Power generation unit and photovoltaic power station Download PDFInfo
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- CN104320072A CN104320072A CN201410631005.4A CN201410631005A CN104320072A CN 104320072 A CN104320072 A CN 104320072A CN 201410631005 A CN201410631005 A CN 201410631005A CN 104320072 A CN104320072 A CN 104320072A
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- 238000010248 power generation Methods 0.000 title claims abstract description 25
- 230000000903 blocking effect Effects 0.000 abstract 1
- 230000005611 electricity Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 238000012423 maintenance Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000003491 array Methods 0.000 description 1
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- 230000005855 radiation Effects 0.000 description 1
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Classifications
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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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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/04—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof adapted as photovoltaic [PV] conversion devices
- H01L31/042—PV modules or arrays of single PV cells
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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
- H02S10/00—PV power plants; Combinations of PV energy systems with other systems for the generation of electric power
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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
Abstract
The embodiment of the invention discloses a power generation unit which comprises a photovoltaic power generation array and an inverter device. A plurality of photovoltaic subarrays at least comprise two rows of photovoltaic subarrays, and each row of photovoltaic subarrays comprises a first row of photovoltaic modules and a second row of photovoltaic modules. The inverter device comprises serial string type inverters which are in one-to-one correspondence with all the rows of photovoltaic modules and are electrically connected with all the rows of photovoltaic modules. Accordingly, in the power generation unit, the photovoltaic modules in different rows are provided with the corresponding serial string type inverters. Therefore, the power generation unit can conduct different MPPT tracking on the photovoltaic modules in different rows, and the light blocking phenomenon happening to the photovoltaic modules in one certain row in all the rows of photovoltaic subarrays can be avoided. The problem that the electric quantity of the entire power generation unit is affected by shadows is solved, and the power generation efficiency of the power generation unit is improved.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, particularly relate to a kind of generator unit and photovoltaic plant.
Background technology
Have the advantages such as cleanliness without any pollution due to solar power generation, the installed capacity of domestic photovoltaic plant in recent years increases year by year fast.Current photovoltaic plant can be divided into ground large photovoltaic plant and distributed photovoltaic power station, roof.Wherein, ground light overhead utility floor space is wide, and installed capacity is large, generally adopts the technical scheme that distributed generation, centralized control, single-point are grid-connected.Usually, ground large photovoltaic plant is made up of several generator units, and each generator unit installed capacity is about 1MW.
As shown in Figure 1, generator unit of the prior art comprises: photovoltaic array district 101, direct current doab 102, inversion boosting district 103, roadway area, place 104, array front and rear row spacing district 105.Wherein, described photovoltaic array district 101 comprises the identical photovoltaic subarray 106 of 102 structures, divide 13 row's arrangements, each photovoltaic subarray 106 is generally made up of the photovoltaic module of 36 pieces of 300W (or other numerical value such as 295W, 305W, 310W), these 36 pieces of photovoltaic modulies divide two rows each 18 build enemy arrangements, it should be noted that, in each photovoltaic subarray, the quantity of photovoltaic module can adjust according to local temperature condition; Roadway area, described place 104 is positioned at the middle part of described generator unit place; The photovoltaic combiner box of described direct current doab 102, respectively in the both sides of roadway area, described place 104, is installed on photovoltaic bracket; Described inversion boosting district 103 is positioned at the center of described generator unit, comprises the concentrated inverter of 2 500kW and the step-up transformer of 1 1100kVA.Its operation principle is: the photovoltaic subarray 106 in described photovoltaic array district 101 accesses the concentrated inverter in inversion boosting district 103 after the photovoltaic combiner box of described direct current doab 102 confluxes, through described concentrated inverter by after converting direct-current power into alternating-current power, then boost through described step-up transformer.But the generating efficiency of above-mentioned generator unit has much room for improvement.
Summary of the invention
For solving the problems of the technologies described above, embodiments provide a kind of generator unit and photovoltaic plant, to improve the generating efficiency of described generator unit.
For solving the problem, embodiments provide following technical scheme:
A kind of generator unit, comprising:
Photovoltaic power generation array, described photovoltaic power generation array comprises multiple photovoltaic subarray, and described multiple photovoltaic subarray at least comprises two row's photovoltaic subarrays, often arranges photovoltaic subarray and includes first row photovoltaic module and second row photovoltaic module;
DC-to-AC converter, described DC-to-AC converter comprises: with each row's photovoltaic module one_to_one corresponding, and the group serial type inverter be electrically connected with each row's photovoltaic module.
Preferably, also comprise: the collector-shoe gear be electrically connected with each group of serial type inverter.
Preferably, also comprise: the step-up transformer be electrically connected with described collector-shoe gear.
Preferably, often arrange photovoltaic subarray to comprise: the first row photovoltaic subarray be oppositely arranged and secondary series photovoltaic subarray.
Preferably, described photovoltaic power generation array comprises 129 photovoltaic subarrays, described 129 photovoltaic subarrays are divided into 13 row's photovoltaic subarrays, and wherein 1 row's photovoltaic subarray comprises 9 photovoltaic subarrays, often arrange photovoltaic subarray and comprise 10 photovoltaic subarrays in residue 12 row photovoltaic subarray; Described DC-to-AC converter comprises 52 group serial type inverters.
Preferably, described collector-shoe gear comprises 8 interchange bus cases.
Preferably, every platform exchanges bus cases and organizes serial type inverter be electrically connected with 6
Preferably, each group serial type inverter is electrically connected with described step-up transformer by stube cable.
Preferably, be electrically connected by direct current cables between the group serial type inverter that each row's photovoltaic module is corresponding with it.
A kind of photovoltaic plant comprising generator unit described in above-mentioned any one.
Compared with prior art, technique scheme has the following advantages:
The generator unit that the embodiment of the present invention provides comprises: photovoltaic power generation array and DC-to-AC converter, and wherein, described multiple photovoltaic subarray at least comprises two row's photovoltaic subarrays, often arranges photovoltaic subarray and includes first row photovoltaic module and second row photovoltaic module; Described DC-to-AC converter comprises: with each row's photovoltaic module one_to_one corresponding, and the group serial type inverter be electrically connected with each row's photovoltaic module.As can be seen here, in the generator unit that the embodiment of the present invention provides, the photovoltaic module of different row all has the group serial type inverter corresponding with it, thus the generator unit that the embodiment of the present invention is provided, can realize carrying out different MPPT to the photovoltaic module of difference row to follow the tracks of, to avoid a certain row's photovoltaic subarray in each row's photovoltaic subarray to occur light-baffling phenomena, and make the electricity of whole generator unit all be subject to the problem of shade impact, improve the generating efficiency of described generator unit.
And, in the generator unit that the embodiment of the present invention provides, the photovoltaic subarray of different row is electrically connected from different group serial type inverters, thus when certain group serial type inverter breaks down, only can affect the photovoltaic subarray that the group serial type inverter that breaks down with this is electrically connected, and can not affect and other photovoltaic subarrays, coverage is less.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is the structural representation of generator unit in prior art;
The structural representation of generator unit of Fig. 2 for providing in one embodiment of the invention;
The structural representation of photovoltaic subarray of Fig. 3 for providing in one embodiment of the invention;
Fig. 4 is divided into the schematic diagram of 10 subelements that conflux for the generator unit provided in one embodiment of the invention;
Fig. 5 is after being divided into 10 subelements that conflux in Fig. 4, the structural representation of the subelement 301 that confluxes;
Fig. 6 is after being divided into 10 subelements that conflux in Fig. 4, the structural representation of the subelement 305 that confluxes;
Fig. 7 is after being divided into 10 subelements that conflux in Fig. 4, the structural representation of the subelement 309 that confluxes;
Fig. 8 is after being divided into 10 subelements that conflux in Fig. 4, the structural representation of the subelement 310 that confluxes;
In the generator unit that Fig. 9 provides for one embodiment of the invention, group serial type inverter, exchange electrical connection schematic diagram between bus cases and step-up transformer;
In the generator unit that Figure 10 provides for one embodiment of the invention, the same subelement and in same row's photovoltaic subarray of confluxing, the electrical connection schematic diagram of the group serial type inverter that each photovoltaic module is corresponding with it.
Embodiment
Just as described in the background section, in prior art, the generating efficiency of generator unit has much room for improvement.
Inventor studies discovery, according to design of photovoltaic power station specification, in each generator unit, the spacing of front and rear row photovoltaic array can only ensure that be not in the light in the at 9 in morning winter solstice at 3 in afternoon (namely upper row's photovoltaic module and lower row's photovoltaic module are not all in the light), except this time period, lower row's photovoltaic module there will be light-baffling phenomena.And every platform concentrated inverter only has 3 road MPPT (i.e. Maximum Power Point Tracking, MPPT maximum power point tracking), namely comprise the power of 6 road MPPT to 102 photovoltaic subarrays in each generator unit of the prior art altogether to follow the tracks of, and in prior art when this 6 road MPPT is accessed between each photovoltaic subarray and concentrated inverter, each MPPT is not strictly distinguished, thus when causing lower row's photovoltaic module to occur light-baffling phenomena, the electricity of whole generator unit all can be subject to the impact of shade, cause the generating efficiency of described generator unit lower.
And, for hillside type photovoltaic plant, its surface relief setting up position is uneven, make respectively to arrange the different towards possibility of photovoltaic subarray in each generator unit, and difference towards the solar radiation quantity that receives of photovoltaic subarray different, by the restriction of MPPT quantity and connected mode in concentrated inverter, in prior art generator unit concentrated inverter each MPPT cannot to difference towards each row's photovoltaic subarray distinguish, thus affect the overall generating efficiency of each generator unit.
In addition, because generator unit of the prior art only includes 2 concentrated inverters, when a certain concentrated inverter breaks down, each row's photovoltaic subarray be connected with this concentrated inverter all can be affected, and capacity is about 0.5MW, and coverage is larger.
In view of this, embodiments provide a kind of generator unit, comprising:
Photovoltaic power generation array, described photovoltaic power generation array comprises multiple photovoltaic subarray, and described multiple photovoltaic subarray at least comprises two row's photovoltaic subarrays, often arranges photovoltaic subarray and includes first row photovoltaic module and second row photovoltaic module;
DC-to-AC converter, described DC-to-AC converter comprises: with each row's photovoltaic module one_to_one corresponding, and the group serial type inverter be electrically connected with each row's photovoltaic module.
In the generator unit that the embodiment of the present invention provides, the photovoltaic module of different row all has the group serial type inverter corresponding with it, thus the generator unit that the embodiment of the present invention is provided, the MPPT that can realize the photovoltaic module of difference row is not gone the same way follows the tracks of, light-baffling phenomena is there is to avoid row's photovoltaic subarray in each row's photovoltaic subarray, and make the electricity of whole generator unit all be subject to the problem of shade impact, and then improve the generating efficiency of described generator unit.
For hillside type photovoltaic plant, although each row's photovoltaic subarray towards difference in described generator unit, but, in the generator unit that the embodiment of the present invention provides, the group serial type inverter that each row's photovoltaic subarray is corresponding different respectively, with to difference towards each row's photovoltaic subarray distinguish, thus solve concentrated inverter in prior art each MPPT cannot to difference towards each row's photovoltaic subarray distinguish, thus affect the problem of the overall generating efficiency of each generator unit.
And, in the generator unit that the embodiment of the present invention provides, the photovoltaic subarray of different row is electrically connected from different group serial type inverters, thus when certain group serial type inverter breaks down, only can affect the photovoltaic subarray that the group serial type inverter that breaks down with this is electrically connected, and can not affect and other photovoltaic subarrays, coverage is less.
For enabling above-mentioned purpose of the present invention, feature and advantage more become apparent, and are described in detail the specific embodiment of the present invention below in conjunction with accompanying drawing.
Set forth detail in the following description so that fully understand the present invention.But the present invention can be different from alternate manner described here to implement with multiple, those skilled in the art can when without prejudice to doing similar popularization when intension of the present invention.Therefore the present invention is not by the restriction of following public concrete enforcement.
Embodiments provide a kind of generator unit, comprise: photovoltaic power generation array, described photovoltaic power generation array comprises multiple photovoltaic subarray, and described multiple photovoltaic subarray at least comprises two row's photovoltaic subarrays, often arranges photovoltaic subarray and includes first row photovoltaic module and second row photovoltaic module; DC-to-AC converter, described DC-to-AC converter comprises: with each row's photovoltaic module one_to_one corresponding, and the group serial type inverter be electrically connected with each row's photovoltaic module, described group of serial type inverter is used for the output current of each row's photovoltaic module be connected electrically to be converted to the laggard line output of alternating current by direct current.
It should be noted that, when the photovoltaic subarray quantity that described generator unit comprises is more, if directly the output current of each group of serial type inverter is flowed to electrical network, the pressure drop between each group of serial type inverter and electrical network can be caused excessive.Therefore when the photovoltaic subarray quantity that described generator unit comprises is more, in a preferred embodiment of the invention, described generator unit also comprises: the collector-shoe gear be electrically connected with each group of serial type inverter, exports after the alternating current for exporting each group of serial type inverter confluxes again.
Also it should be noted that, for power large-scale electric generating station, because power large-scale electric generating station requires that the output voltage of described generator unit is higher, as 35kV or 110kV, therefore when the generator unit that the embodiment of the present invention provides is for power large-scale electric generating stations such as western parts, described generator unit also comprises: the step-up transformer be electrically connected with described collector-shoe gear, to convert the output current of described collector-shoe gear to high-tension current, to meet the requirement of power large-scale electric generating station for described generator unit output voltage.Preferably, described step-up transformer is box type transformer.In one particular embodiment of the present invention, described box type transformer is 1400kVA box type transformer, preferred, and the electric pressure of described box-type transformation can be 35kV, 10kV or other voltage values, the present invention does not limit this, specifically depending on grid-connected voltage.
In another embodiment of the present invention, described generator unit can also only include: photovoltaic power generation array, DC-to-AC converter and step-up transformer, do not comprise collector-shoe gear, wherein, described DC-to-AC converter is directly connected with step-up transformer, is exported after the current boost that described DC-to-AC converter is exported, connection line just between DC-to-AC converter and step-up transformer is more, when described generator unit comprises collector-shoe gear, after the output current of group serial type inverter each in DC-to-AC converter confluxes by described collector-shoe gear, export to step-up transformer again, significantly can reduce the connection line quantity between DC-to-AC converter and step-up transformer, but the present invention does not limit this, specifically depend on the circumstances.
On the basis of above-mentioned any embodiment, in one embodiment of the invention, often arranging photovoltaic subarray can comprise: the first row photovoltaic subarray be oppositely arranged and secondary series photovoltaic subarray, divides and is located at road both sides; In another embodiment of the present invention, often arrange photovoltaic subarray and also can only include a row photovoltaic subarray, be only arranged on one side of road, the present invention does not limit this, specifically depending on landform residing for it.
As shown in Figure 2, on the basis of above-mentioned any embodiment, in one particular embodiment of the present invention, the generate output of described generator unit is about 1.4MW, described photovoltaic power generation array comprises 129 photovoltaic subarrays, described 129 photovoltaic subarrays are divided into 13 row's photovoltaic subarrays, wherein have 1 row's photovoltaic subarray to comprise 9 photovoltaic subarrays, often arrange photovoltaic subarray and comprise 10 photovoltaic subarrays in 12 row's photovoltaic subarrays; Described DC-to-AC converter comprises 52 group serial type inverters.
Below in conjunction with the generator unit shown in Fig. 2, the generator unit that the embodiment of the present invention provides is described in detail.But the present invention does not limit this, in other embodiments of the invention, described generator unit can also comprise the photovoltaic subarray of other quantity and other quantity row photovoltaic subarray (as described in the capacity of generator unit be 1.3MW, comprise 119 photovoltaic subarrays altogether, other numerical value such as 12 row's photovoltaic subarrays), specifically depending on the energy output of described generator unit.
As shown in Figure 2, in embodiments of the present invention, described generator unit comprises: photovoltaic power generation array district 201, inversion doab 202, boosting allobar 203, roadway area, place 204 and front and rear row photovoltaic array spacing district 205.Wherein, described photovoltaic power generation array district 201 comprises 129 photovoltaic subarrays 206, and point 13 row's arrangements, wherein have 1 row's photovoltaic subarray to comprise 9 photovoltaic subarrays, often arranges photovoltaic subarray and comprise 10 photovoltaic subarrays in residue 12 row photovoltaic subarray.Often arrange photovoltaic subarray and be divided into first row photovoltaic subarray and secondary series photovoltaic subarray, set up the both sides in roadway area, place 204 separately.Preferably, the left and right spacing range between same row's adjacent photovoltaic subarray 106 is 0.2m-1m; Fore-and-aft clearance between adjacent row's photovoltaic subarray at least meets between morning 9 at 15 in afternoon winter solstice, and front-seat photovoltaic subarray can not produce shade to rear row's photovoltaic subarray.
Concrete, as shown in Figure 3, in one embodiment of the invention, each photovoltaic subarray 206 comprises 36 pieces of photovoltaic module P1-P36, two rows are divided into head to head to arrange, wherein, in described photovoltaic module P1-photovoltaic module P18 (i.e. first row photovoltaic module), there is the side of terminal box to install downwards, in described photovoltaic module P19-photovoltaic module P36 (i.e. second row photovoltaic module), have the side of terminal box upwards to install.In embodiments of the present invention, it is a string that the both positive and negative polarity of described first row photovoltaic module is electrically connected composition successively, be electrically connected with first group of serial type inverter, it is a string that the both positive and negative polarity of described second row photovoltaic module is electrically connected composition successively, be electrically connected with second group of serial type inverter, to ensure that carrying out different MPPT to two rows photovoltaic module follows the tracks of.
Preferably, the spacing range in each row's photovoltaic module between the adjacent photovoltaic assembly of left and right is preferably 20mm-40mm; The spacing range arranging (namely between first row photovoltaic module and second row photovoltaic module) between photovoltaic module up and down is also preferably 20mm-40mm, and the present invention does not limit this, specifically depends on the circumstances.The power of described photovoltaic module can be 300W, and also can be 295W, can also be 305W or other numerical value, the present invention also limit this, specifically depends on the circumstances.
On the basis of above-described embodiment, in one particular embodiment of the present invention, described collector-shoe gear comprises 8 and exchanges bus cases, sets up separately in both sides, roadway area, place 204.In an embodiment of the present embodiment, described 8 interchange bus cases comprise 66 remittances 1 and exchange bus cases, 28 remittances 1 exchange bus cases, in other embodiments of the present embodiment, described 8 interchange bus cases comprise 86 remittances 1 and exchange bus cases, and in other embodiments of the present embodiment, described 8 exchange the interchange bus cases that bus cases can also be other types, the present invention does not limit this, as long as ensure that it can conflux to each group of serial type inverter.
As shown in Figure 4, in the present embodiment, described 8 interchange bus cases comprise 86 remittances 1 and exchange bus cases, are distributed in the both sides of roadway area, place 204, are installed on photovoltaic bracket.Wherein, every platform exchanges bus cases and organizes serial type inverter be electrically connected with 6, respectively there are in corresponding 13 row's photovoltaic subarrays 12 row's photovoltaic arrays of 10 photovoltaic subarrays, 1 row's photovoltaic subarray that residue has 9 photovoltaic subarrays not with exchange bus cases and be electrically connected, be directly electrically connected with step-up transformer.
As shown in Figure 4, in one particular embodiment of the present invention, described generator unit is divided into 10 subelements that conflux, namely conflux subelement 301-310, wherein, the described subelement 301-301 that confluxes is 4 subelements of same structure form, described in conflux subelement 305-308 can 4 subelements of same structure form.Be described in detail the described subelement 301-304 that confluxes for the subelement 301 that confluxes below, to conflux, subelement 305 is described in detail the described subelement 305-308 that confluxes, and the subelement 309 that confluxes is set forth separately with the subelement 310 that confluxes.
As shown in Figure 5, the subelement 301 that confluxes described in comprises three rows, 15 photovoltaic subarray A1-1-A1-15,6 28kW group serial type inverter N1-1 to N1-6,1 interchange bus cases H1.Wherein, 6 group serial type inverter N1-1 to N1-6, are arranged on the right side (namely near the side of roadway area, place 204) of the subelement that confluxes, are installed on the support of rightmost side photovoltaic subarray with the form of often arranging two; 1 exchanges the right side that bus cases is positioned at middle row's photovoltaic subarray, with group serial type inverter N1-3 with organize serial type inverter N1-4 and be installed on the support of rightmost side photovoltaic subarray side by side, and be positioned at the right side of described group of serial type inverter N1-4, the output current of 6 group serial type inverter N1-1 to N1-6 is confluxed.
As shown in Figure 6, the subelement 305 that confluxes described in comprises three rows, 15 photovoltaic subarray A5-1-A5-15,6 28kW group serial type inverter N5-1 to N5-6,1 interchange bus cases H5.Wherein, the left side (namely near the side of roadway area, place 204) of the subelement that confluxes described in 6 group serial type inverter N5-1 to N5-6 are arranged on the form of often arranging two, is installed on the support of leftmost side photovoltaic subarray; 1 exchanges the left side that bus cases is positioned at middle row's photovoltaic subarray, with group serial type inverter N5-3 with organize serial type inverter N5-4 and be installed on the support of leftmost side photovoltaic subarray side by side, and be positioned at the left side of described group of serial type inverter N5-4, the output current of 6 group serial type inverter N5-1 to N5-6 is confluxed.
As shown in Figure 7, the described subelement 309 that confluxes comprises 5 photovoltaic subarray A9-1-A9-5,2 group serial type inverter N9-1 and N9-2, to conflux described in described group of serial type inverter N9-1 and group serial type inverter N9-2 is positioned at the right side (i.e. the side of close roadway area, place 204) of subelement 309, be installed on the support of photovoltaic subarray of the rightmost side side by side, without the need to exchanging bus cases, be directly electrically connected with step-up transformer.
As shown in Figure 8, the described subelement 310 that confluxes comprises 4 photovoltaic subarray A10-1-A10-4,2 group serial type inverter N10-1 and N10-2, to conflux described in described group of serial type inverter N10-1 and group serial type inverter N10-2 is positioned at the left side (i.e. the side of close roadway area, place 204) of subelement 310, be installed on the support of photovoltaic subarray of the leftmost side side by side, without the need to exchanging bus cases, be directly electrically connected with step-up transformer.
On the basis of above-mentioned any embodiment, in one embodiment of the invention, each group serial type inverter is electrically connected with step-up transformer by stube cable.Concrete, in the above-described embodiments, described stube cable comprises: the first stube cable and the second stube cable that are juxtaposed on both sides, roadway area, place, and the 3rd stube cable be all electrically connected with described first stube cable, the second stube cable.As shown in Figure 9, described first stube cable L1 is for interchange bus cases H1-H4 corresponding to the subelement 301-304 that confluxes described in being electrically connected, described second stube cable L2 for interchange bus cases H1-H8 corresponding to the subelement 305-308 that confluxes described in being electrically connected, described 3rd stube cable L3 for subelement 309 correspondence of confluxing described in being electrically connected group serial type inverter N9-1 and N9-2, described in conflux group serial type inverter N10-1 and N10-2, the first stube cable L1, second stube cable L2 and the step-up transformer of subelement 310 correspondence.Preferably, described first stube cable L1, the second stube cable L2 and the 3rd stube cable L3 are arranged in cable trough, but the present invention does not limit this, specifically depends on the circumstances.
It should be noted that, for the photovoltaic subarray being positioned at same conflux subelement and same row, its first row photovoltaic module is electrically connected with first group of serial type inverter, second row photovoltaic module is electrically connected with second group of serial type inverter, for first row photovoltaic subarray A1-1 to the A1-5 confluxed in subelement 301, it is arranged photovoltaic module to be electrically connected with group serial type inverter N1-1, lower row's photovoltaic module is electrically connected with group serial type inverter N1-2, as shown in Figure 10.Preferably, be electrically connected by direct current cables L4 between the group serial type inverter that each row's photovoltaic module is corresponding with it, preferred, described direct current cables L4 lays along the rack beam of described photovoltaic module.
Accordingly, the embodiment of the present invention additionally provides a kind of photovoltaic plant comprising the generator unit that above-mentioned any embodiment provides.
In sum, in the generator unit that the embodiment of the present invention provides and photovoltaic plant, the photovoltaic module of different row all has the group serial type inverter corresponding with it, thus the generator unit that the embodiment of the present invention is provided, the MPPT that can realize the photovoltaic module of difference row is not gone the same way follows the tracks of, light-baffling phenomena is there is to avoid row's photovoltaic subarray in each row's photovoltaic subarray, and make the electricity of whole generator unit all be subject to the problem of shade impact, and then improve the generating efficiency of described generator unit.
For hillside type photovoltaic plant, although each row's photovoltaic subarray towards difference in described generator unit, but, in the generator unit that the embodiment of the present invention provides, the group serial type inverter that each row's photovoltaic subarray is corresponding different respectively, with to difference towards each row's photovoltaic subarray distinguish, thus solve concentrated inverter in prior art each MPPT cannot to difference towards each row's photovoltaic subarray distinguish, thus affect the problem of the overall generating efficiency of each generator unit.
And, in the generator unit that the embodiment of the present invention provides, the photovoltaic subarray of different row is electrically connected from different group serial type inverters, thus when certain group serial type inverter breaks down, only can affect the photovoltaic subarray that the group serial type inverter that breaks down with this is electrically connected, about 28kW, and can not affect and other photovoltaic subarrays, coverage is less.
In addition, in the generator unit that the embodiment of the present invention provides and photovoltaic plant, each group serial type inverter, exchange the both sides that bus cases and step-up transformer are all positioned at roadway area, place, thus make the maintenance in later stage running and maintenance all very convenient.
In this specification, various piece adopts the mode of going forward one by one to describe, and what each some importance illustrated is the difference with other parts, between various piece identical similar portion mutually see.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein can without departing from the spirit or scope of the present invention, realize in other embodiments.Therefore, the present invention can not be restricted to embodiment illustrated herein, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. a generator unit, is characterized in that, comprising:
Photovoltaic power generation array, described photovoltaic power generation array comprises multiple photovoltaic subarray, and described multiple photovoltaic subarray at least comprises two row's photovoltaic subarrays, often arranges photovoltaic subarray and includes first row photovoltaic module and second row photovoltaic module;
DC-to-AC converter, described DC-to-AC converter comprises: with each row's photovoltaic module one_to_one corresponding, and the group serial type inverter be electrically connected with each row's photovoltaic module.
2. generator unit according to claim 1, is characterized in that, also comprises: the collector-shoe gear be electrically connected with each group of serial type inverter.
3. generator unit according to claim 1 and 2, is characterized in that, also comprises: the step-up transformer be electrically connected with described collector-shoe gear.
4. generator unit according to claim 3, is characterized in that, often arranges photovoltaic subarray and comprises: the first row photovoltaic subarray be oppositely arranged and secondary series photovoltaic subarray.
5. generator unit according to claim 4, it is characterized in that, described photovoltaic power generation array comprises 129 photovoltaic subarrays, described 129 photovoltaic subarrays are divided into 13 row's photovoltaic subarrays, wherein 1 row's photovoltaic subarray comprises 9 photovoltaic subarrays, often arranges photovoltaic subarray and comprise 10 photovoltaic subarrays in residue 12 row photovoltaic subarray; Described DC-to-AC converter comprises 52 group serial type inverters.
6. generator unit according to claim 5, is characterized in that, described collector-shoe gear comprises 8 and exchanges bus cases.
7. generator unit according to claim 6, is characterized in that, every platform exchanges bus cases and organizes serial type inverter be electrically connected with 6.
8. the generator unit according to any one of claim 7, is characterized in that, each group serial type inverter is electrically connected with described step-up transformer by stube cable.
9. the generator unit according to claim 1-2 or any one of 4-8, is characterized in that, is electrically connected between the group serial type inverter that each row's photovoltaic module is corresponding with it by direct current cables.
10. one kind comprises the photovoltaic plant of generator unit described in any one of claim 1-9.
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| CN201410631005.4A CN104320072A (en) | 2014-11-11 | 2014-11-11 | Power generation unit and photovoltaic power station |
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| CN201410631005.4A CN104320072A (en) | 2014-11-11 | 2014-11-11 | Power generation unit and photovoltaic power station |
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