CN111710741A - Photovoltaic power generation device - Google Patents
Photovoltaic power generation device Download PDFInfo
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- CN111710741A CN111710741A CN202010682950.2A CN202010682950A CN111710741A CN 111710741 A CN111710741 A CN 111710741A CN 202010682950 A CN202010682950 A CN 202010682950A CN 111710741 A CN111710741 A CN 111710741A
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- 238000010248 power generation Methods 0.000 title claims abstract description 40
- 239000000126 substance Substances 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 14
- 239000000463 material Substances 0.000 description 8
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
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- 238000006467 substitution reaction Methods 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
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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
- H01L31/05—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells
- H01L31/0504—Electrical interconnection means between PV cells inside the PV module, e.g. series connection of PV cells specially adapted for series or parallel connection of solar cells in a module
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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
- H02S40/30—Electrical components
- H02S40/34—Electrical components comprising specially adapted electrical connection means to be structurally associated with the PV module, e.g. junction boxes
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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
- H02S40/30—Electrical components
- H02S40/36—Electrical components characterised by special electrical interconnection means between two or more PV modules, e.g. electrical module-to-module connection
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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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- Engineering & Computer Science (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention discloses a photovoltaic power generation device, and relates to the technical field of solar cells. The photovoltaic power generation device comprises a first photovoltaic module and a second photovoltaic module; the first photovoltaic module and the second photovoltaic module respectively comprise odd solar cell string groups, a first connector and a second connector which are mutually connected in series; the first photovoltaic module further comprises a first bypass diode, a first end of the solar cell string group at one side edge in the first photovoltaic module is connected with the first connector through the first bypass diode, and a second end of the solar cell string group is connected with the second connector; the first end of the solar cell string group at one side edge of the second photovoltaic module is connected with the second connector, and the second end of the solar cell string group is connected with the first connector; the first photovoltaic module and the second photovoltaic module are connected through the first connector and the second connector at one side edge. The embodiment reduces the number of bypass diodes used in a photovoltaic module including an odd number of solar cell strings and improves the power generation efficiency of the photovoltaic module.
Description
Technical Field
The invention relates to the technical field of solar cells, in particular to a photovoltaic power generation device.
Background
In order to satisfy the safety of the internal circuit of the photovoltaic module, the solar cell string in the photovoltaic module is generally connected in parallel with the bypass diode to prevent the cell pieces in the solar cell string from being burnt due to the hot spot effect.
At present, in a photovoltaic module including an odd number of solar cell strings, each pair of solar cell strings is connected in parallel with a bypass diode, and the remaining 1 solar cell string needs to be connected with a bypass diode in a flying wire manner by using an independent bus bar. That is to say, in the photovoltaic module with an odd number of solar cell strings, one solar cell string inevitably needs to be connected with a bypass diode in parallel, which causes material waste to a certain extent and increases the cost of the photovoltaic module.
Disclosure of Invention
In view of this, embodiments of the present invention provide a photovoltaic power generation apparatus, which can reduce the number of bypass diodes in a photovoltaic module including an odd number of solar cell strings, thereby saving the materials used by the photovoltaic module and reducing the cost of the photovoltaic module.
To achieve the above object, according to an aspect of an embodiment of the present invention, there is provided a photovoltaic power generation apparatus.
A photovoltaic power generation device of an embodiment of the present invention includes: a first photovoltaic module and a second photovoltaic module; wherein the content of the first and second substances,
the first photovoltaic module and the second photovoltaic module respectively include: the solar cell system comprises odd solar cell string groups, a first connector and a second connector which are connected in series; the polarity of the first connector and the second connector is opposite;
the first photovoltaic module further comprises a first bypass diode disposed at a first side edge of the first photovoltaic module;
in the first photovoltaic module, a first end of the solar cell string group at the first side edge is connected to the first connector through the first bypass diode, and a second end of the solar cell string group at the first side edge is connected to the second connector;
in the second photovoltaic module, two ends of the solar cell string group (14) at the second side edge are respectively connected with the first connector and the second connector; the first side edge and the second side edge are opposite;
the first photovoltaic module and the second photovoltaic module are connected through the first connector and the second connector, so that the solar cell string group at one side edge of the first photovoltaic module and the second photovoltaic module is connected with the first bypass diode in parallel.
Optionally, a first end of the solar cell string at the second side edge of the second photovoltaic module is connected to the second connector, and a second end of the solar cell string at the second side edge is connected to the first connector; the polarity of the first end of the solar cell string group at the second side edge in the second photovoltaic module is opposite to that of the first end of the solar cell string group at the first side edge in the first photovoltaic module.
Alternatively,
the first photovoltaic module and the second photovoltaic module further include: a second bypass diode;
and in the other solar cell string groups except the first side edge in the first photovoltaic module and except the second side edge in the second photovoltaic module, each pair of the solar cell string groups is connected with one second bypass diode in parallel.
Alternatively,
the first bypass diode and the second bypass diode in the first photovoltaic module are located at the same end of the solar cell string.
Alternatively,
the second bypass diode at the second side edge of the first photovoltaic module is connected to the first connector;
the second bypass diode at the first side edge of the second photovoltaic module is connected to the second connector.
Alternatively,
the first photovoltaic module and the second photovoltaic module further include: a junction box, a bus bar and a connecting wire; wherein the content of the first and second substances,
the first bypass diode and the second bypass diode are respectively arranged in the junction box;
the solar cell string groups are connected through the bus bars;
in the first photovoltaic module, an outgoing line of the bus bar at a first end of the solar cell string at the first side edge is connected to the first bypass diode; the junction boxes where the first bypass diode and the second bypass diode at the second side edge are located are respectively connected with the first connector through the connecting wires;
in the second photovoltaic module, the junction box where the second bypass diode is located at the first side edge is connected with the second connector through the connecting wire.
Alternatively,
in the first photovoltaic module, the outgoing line of the bus bar at the second end of the solar cell string at the first side edge is connected with the junction box, and the junction box is connected with the second connector through a connecting line in the junction box;
in the second photovoltaic module, outgoing lines of the bus bars at two ends of the solar cell string at the second side edge are respectively connected with the junction box, and the junction box is respectively connected with the second connector and the first connector through the connecting lines.
Alternatively,
the number of the solar cell string groups respectively included by the first photovoltaic module and the second photovoltaic module is the same.
Alternatively,
the solar cell string set includes: one solar cell string or at least two solar cell strings connected in parallel to each other, each of the solar cell strings comprising: and the solar cells are connected in series.
Alternatively,
the number of the solar cell strings in each of the solar cell string groups in the first photovoltaic module and the second photovoltaic module is the same.
One embodiment of the above invention has the following advantages or benefits: the first end of the solar cell string group at one side edge of the first photovoltaic module is connected with the first connector through the first bypass diode, and the second end of the solar cell string group is connected with the second connector. In addition, the solar cell string group at one edge of the second photovoltaic module does not need to be connected with a bypass diode in parallel independently, and only the second connector and the first connector are connected to two ends of the solar cell string group at the edge respectively, so that the first photovoltaic module and the second photovoltaic module can be connected through the first connector and the second connector at the edge to form the photovoltaic power generation device. In the photovoltaic power generation device, the solar cell string groups at the edges of the first photovoltaic module and the second photovoltaic module are connected with the first bypass diode in parallel, namely the solar cell string groups at the edges of the first photovoltaic module and the second photovoltaic module share the first bypass diode. Therefore, the number of bypass diodes in the photovoltaic module comprising an odd number of solar cell strings is reduced, the materials used by the photovoltaic module are saved, and the cost of the photovoltaic module is reduced.
Drawings
The drawings are included to provide a better understanding of the invention and are not to be construed as unduly limiting the invention. Wherein:
FIG. 1 is a schematic structural diagram of a first photovoltaic module according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of electrical connections of a first photovoltaic assembly according to an embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a second photovoltaic module according to an embodiment of the present invention;
FIG. 4 is a schematic diagram of electrical connections of a second photovoltaic assembly according to an embodiment of the present invention;
fig. 5 is a schematic structural diagram of a connection mode of a first photovoltaic module and a second photovoltaic module according to an embodiment of the invention;
FIG. 6 is an electrical schematic of a manner of connecting a first photovoltaic module and a second photovoltaic module according to an embodiment of the present invention;
FIG. 7 is a schematic structural diagram of another first photovoltaic module according to an embodiment of the present invention;
FIG. 8 is a schematic diagram of electrical connections of another first photovoltaic assembly according to an embodiment of the present invention;
FIG. 9 is a schematic structural view of another second photovoltaic module according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of electrical connections of another second photovoltaic assembly according to an embodiment of the present invention;
fig. 11 is a schematic structural view of another connection mode of a first photovoltaic module and a second photovoltaic module according to an embodiment of the invention;
fig. 12 is an electrical schematic of another manner of connecting the first photovoltaic module and the second photovoltaic module according to an embodiment of the present invention.
The reference numbers are as follows:
10 photovoltaic power generation device
11 first photovoltaic module
12 second photovoltaic module
13 first bypass diode
14, 14' solar cell string group
15, 15' first connector
16, 16' second connector
17, 17' second bypass diode
18, 18' junction box
19, 19' bus bar
20, 20' connecting line
Detailed Description
The details will be described below.
As shown in fig. 1 to 6, a photovoltaic power generation apparatus 10 provided in an embodiment of the present invention mainly includes: a first photovoltaic module 11 and a second photovoltaic module 12; wherein the content of the first and second substances,
the first photovoltaic module 11 and the second photovoltaic module 12 respectively include: an odd number of solar cell string groups 14, 14 ', first connectors 15, 15 ' and second connectors 16, 16 ' connected in series with each other; the first connector 15, 15 'and the second connector 16, 16' are of opposite polarity.
Referring to fig. 1 and 2, the first photovoltaic module 11 further includes a first bypass diode 13, the first bypass diode 13 being disposed at a first side edge of the first photovoltaic module 11; in the first photovoltaic module 11, a first end of the solar cell string 14 at the first side edge is connected to the first connector 15 through the first bypass diode 13, and a second end of the solar cell string 14 at the first side edge is connected to the second connector 16. Fig. 1 is a schematic structural diagram of the first photovoltaic module 11, and fig. 2 is an electrical schematic diagram of the first photovoltaic module 11.
Referring to fig. 3 and 4, a first end of the solar cell string 14 'at the second side edge of the second photovoltaic module 12 is connected to the second connector 16', and a second end of the solar cell string 14 'at the second side edge is connected to the first connector 15'; the first end of the solar cell string 14 'at the second side edge in the second photovoltaic module 12 is opposite in polarity to the first end of the solar cell string 14' at the first side edge in the first photovoltaic module 11. Fig. 3 is a schematic structural diagram of the second photovoltaic module 12, and fig. 4 is an electrical schematic diagram of the second photovoltaic module 12.
As shown in fig. 5 and 6, the first photovoltaic module 11 and the second photovoltaic module 12 are connected to each other through the first connectors 15, 15 ' and the second connectors 16, 16 ', so that the solar cell string groups 14, 14 ' at one side edge of the first photovoltaic module 11 and the second photovoltaic module 12 are connected in parallel with the first bypass diode 13, thereby forming the photovoltaic power generation apparatus 10.
According to the above embodiment, the first end of the solar cell string 14 at the first side edge of the first photovoltaic module 11 is connected to the first connector 15 through the first bypass diode 13, while the solar cell string 14 ' at the second side edge of the second photovoltaic module 12 does not need to be connected in parallel with a bypass diode alone, and in the photovoltaic power generation apparatus 10 formed by connecting the first photovoltaic module 11 and the second photovoltaic module 11, the solar cell string 14, 14 ' at the edge of the first photovoltaic module 11 and the second photovoltaic module 12 is connected in parallel with the first bypass diode 13, that is, the solar cell string 14, 14 ' at the edge of the first photovoltaic module 11 and the second photovoltaic module 12 share the first bypass diode 13. Therefore, compared with the prior art in which each photovoltaic module has a solar cell string group separately connected in parallel with a bypass diode, the photovoltaic power generation device 10 provided by the embodiment of the invention reduces the number of bypass diodes in the first photovoltaic module 11 and the second photovoltaic module 12, thereby saving the materials used by the photovoltaic modules and reducing the cost of the photovoltaic modules.
For example, when the photovoltaic module includes 5 solar cell strings, since each of the photovoltaic modules in the prior art needs to separately connect one bypass diode in parallel, one photovoltaic module needs to connect 3 bypass diodes in parallel, and two photovoltaic modules need to connect 6 bypass diodes in parallel. In the embodiment of the present invention, as shown in fig. 5 and fig. 6, since the solar cell string groups at the edge of one side of the first photovoltaic module 11 and the second photovoltaic module 12 can be connected in parallel with the same first bypass diode 13, when the first photovoltaic module 11 and the second photovoltaic module 12 both include 5 solar cell string groups, the photovoltaic power generation apparatus 10 composed of the first photovoltaic module 11 and the second photovoltaic module 12 only needs to be connected in parallel with 5 bypass diodes. Therefore, compared with the prior art, the number of the bypass diodes is reduced, and materials used by the photovoltaic module are saved.
In addition, the solar cell string 14 ' at the second side edge of the second photovoltaic module 12 may be connected to the first connector 15 ' and the second connector 16 ' in other ways than the connection manner shown in fig. 3 and 4. For example, a first end of the solar cell string 14 'at a second side edge of the second photovoltaic module 12 may be connected to the first connector 15', and a second end of the solar cell string 14 'at the second side edge is connected to the second connector 16'; the polarity of the first end of the solar cell string 14 'at the second side edge in the second photovoltaic module 12 is the same as the polarity of the first end of the solar cell string 14' at the first side edge in the first photovoltaic module 11. In this case, when the first photovoltaic module 11 and the second photovoltaic module 12 are connected, the first connectors 15, 15 'and the second connectors 16, 16' on the diagonal lines may be connected by additional connection lines.
In a preferred embodiment of the present invention, in order to reduce the use of connecting wires and the complexity of electrical connection, the solar cell string and the connector are connected in the second photovoltaic module 12 by using the connection method shown in fig. 3 and 4.
Wherein a first side edge of the first photovoltaic module 11 and a second side edge of the second photovoltaic module 12 are opposite as shown in fig. 1 and 3. For example, if the first side edge of the first photovoltaic module is the right side edge thereof, the second side edge of the second photovoltaic module 12 is the left side edge thereof, so as to facilitate the connection between the first photovoltaic module 11 and the second photovoltaic module 12.
In addition, the first and second connectors 15, 15 ', 16' of opposite polarity are positive and negative connectors, respectively. That is, when the first connector 15, 15 'is a positive connector, the second connector 16, 16' is a negative connector. When the first connector 15, 15 'is a negative connector, the second connector 16, 16' is a positive connector.
When the first connector 15, 15 ' and the second connector 16, 16 ' are connected to both ends of the solar cell set 14, respectively, the polarities of the first connector 15, 15 ' and the second connector 16, 16 ' are the same as the polarities of the ends of the solar cell set 14, 14 ', respectively. The first end and the second end of the solar cell string 14, 14 'may be the upper end and the lower end of the solar cell string 14, 14', respectively.
In one embodiment of the present invention, as shown in fig. 1 and 3, the first end of the solar cell set 14, 14 'is the upper end thereof, and the second end of the solar cell set 14, 14' is the lower end thereof. The upper end of the solar cell set 14 at the first side edge of the first photovoltaic module 11 is a positive electrode, which is connected to a positive electrode connector through a junction box, and the lower end of the solar cell set 14 is a negative electrode, which is connected to a negative electrode connector through a junction box. Of course, if in another embodiment of the present invention, the first end of the solar cell set 14 in the first photovoltaic module 11 is a negative electrode, the first end is connected to the negative electrode connector, and the second end of the solar cell set 14 is a positive electrode, the second end is connected to the positive electrode connector.
As shown in fig. 3, in the second photovoltaic module 12, the first connector 15 'and the second connector 16' are connected in the same manner as in the first photovoltaic module 11. It is noted that, when the first photovoltaic module 11 and the second photovoltaic module 12 are connected to each other through the first connectors 15, 15 'and the second connectors 16, 16' at one side edge, the positive connector on the first photovoltaic module 11 is connected to the negative connector on the second photovoltaic module 12, and the negative connector on the first photovoltaic module 11 is connected to the positive connector on the second photovoltaic module 12. Thus, in the second photovoltaic module 12, the first end of the solar cell string 14 'at the second side edge is opposite in polarity to the first end of the solar cell string 14' at the first side edge in the first photovoltaic module 11. Referring to fig. 1 and 3, when the first end (upper end) of the solar cell string 14 at the first side edge on the first photovoltaic module 11 is a positive electrode, it is connected with a positive electrode connector; then, the first end (upper end) of the solar cell string 14' at the second side edge of the second photovoltaic module 12 is a negative electrode, which is connected to a negative electrode connector. Similarly, when the second end (lower end) of the solar cell string 14 at the first side edge of the first photovoltaic module 11 is a negative electrode, it is connected to the negative electrode connector; then, the second end (lower end) of the solar cell string 14' at the second side edge in the second photovoltaic module 12 is the positive electrode, which is connected to the positive electrode connector. The schematic structure of the first photovoltaic module 11 and the second photovoltaic module 12 connected by the first connector 15 and the second connector 16 can be shown in fig. 5, and the corresponding electrical connection diagram is shown in fig. 6. Therefore, the same ends of the first photovoltaic module 11 and the second photovoltaic module 12 can be directly connected through two connectors with opposite polarities, the operation is simple, the implementation is easy, and the first photovoltaic module 11 and the second photovoltaic module 12 can be conveniently assembled to form the photovoltaic power generation device 10. And the length of the connecting line between the first photovoltaic module 11 and the second photovoltaic module 12 can be shortened, and the materials used by the photovoltaic modules are further saved.
In addition, in the first photovoltaic module 11 and the second photovoltaic module 12, in addition to the solar cell string 14, 14 ' at the one side edge, the other solar cell string 14, 14 ' is connected in parallel with the second bypass diode 17, 17 ' to protect the circuit safety of the other solar cell string 14, 14 ' by the second bypass diode 17, 17 '. That is, the first photovoltaic module 11 and the second photovoltaic module 12 further comprise a second bypass diode 17, 17', respectively; in the solar cell string groups 14, 14 ' of the first photovoltaic module 11 except for the first side edge and the second photovoltaic module 12 except for the second side edge, each pair of the solar cell string groups 14, 14 ' is connected in parallel with one of the second bypass diodes 17, 17 '.
Wherein a first side edge of the first photovoltaic module 11 is opposite to a second side edge of the second photovoltaic module 12. For example, if the first side edge of the first photovoltaic module is the right side edge thereof, the second side edge of the second photovoltaic module 12 is the left side edge thereof, so as to facilitate the connection between the first photovoltaic module 11 and the second photovoltaic module 12.
With continued reference to fig. 1, the first photovoltaic module 11 includes 5 solar cell string groups 14, wherein the upper end of the solar cell string group 14 located at the right edge (i.e., the 5 th solar cell string group from the left) is connected to the first bypass diode 13. In the other 4 solar cell string groups 14 except the right edge of the first photovoltaic module 11, each pair of solar cell string groups 14 is connected in parallel with a second bypass diode 17. Specifically, the first and second solar cell string groups 14 from the left in the first photovoltaic module 11 are connected to one second bypass diode 17, and the third and fourth solar cell string groups 14 from the left are connected to another second bypass diode 17.
Similarly, referring to fig. 3, the second photovoltaic module 12 also includes 5 solar cell string sets 14 ', wherein the solar cell string set 14' located at the left edge (i.e., the 1 st solar cell string set from the left) is the solar cell string set connected to the first photovoltaic module 11. In the other 4 solar cell string groups 14 ' except the left edge of the second photovoltaic module 12, each pair of solar cell string groups 14 ' is also connected in parallel with a second bypass diode 17 ', respectively. Specifically, the second and third solar cell string groups 14 'from the left in the second photovoltaic module 12 are connected to one second bypass diode 17', and the fourth and fifth solar cell string groups 14 'from the left are connected to another second bypass diode 17'.
As can also be seen in fig. 1 and 3, the first side edge of the first photovoltaic module 11 and the second side edge of the second photovoltaic module 12 are left-right opposite. For example, in the first photovoltaic module 11, the first side edge to which the first bypass diode 13 is connected is the right side edge thereof, and in the second photovoltaic module 12, the second side edge to which the first photovoltaic module 11 is connected is the left side edge thereof. Therefore, the left and right opposite modes are adopted, so that the first photovoltaic module 11 and the second photovoltaic module 12 can be conveniently connected, and the solar cell string group 14 at the right edge in the first photovoltaic module 11 and the solar cell string group 14' at the left edge of the second photovoltaic module 12 can share the first bypass diode 13. A schematic view of the structure in which the first photovoltaic module 11 and the second photovoltaic module 12 are connected by the first connectors 15, 15 'and the second connectors 16, 16' can be seen in fig. 5, and a corresponding electrical connection view is seen in fig. 6.
It will be appreciated that the first bypass diode 13 and the second bypass diode 17, 17' described in the above embodiments are identical in structure and function, and the main difference between them is only that: the first bypass diode 13 and the second bypass diode 17, 17' are located differently in the photovoltaic module. The first bypass diode 13 refers to a bypass diode connected to a solar cell string 14 on a first side (right side) edge of the first photovoltaic module 11, and the solar cell string on the side edge can be connected to a solar cell string 14' on a second side edge of the second photovoltaic module 12 through a connector. In other words, the first bypass diode 13 is a bypass diode commonly connected to the solar cell string 14 at the first side edge of the first photovoltaic module 11 and the solar cell string 14' at the second side edge of the second photovoltaic module 12. And the second bypass diodes 17, 17 'refer to the bypass diodes connected to the other solar cell string groups 14, 14' in the first photovoltaic module 11 except the first side edge and in the second photovoltaic module 12 except the second side edge.
In one embodiment of the invention, the first bypass diode 13 and the second bypass diode 17, 17 'are located at the same end of the solar cell string 14, 14'. For example, as shown in fig. 1 and 2, the first bypass diode 13 and the second bypass diode 17 are both located at the upper end of the first photovoltaic module 11. Thus, the first bypass diode 13 and the solar cell string 14 at the first end of the solar cell string at one side edge of the first photovoltaic module 11 can be directly connected by using the bus bar without using the flying wire form. Compared with the prior art that a bypass diode is independently connected in a flying line mode, the bypass diode is reduced, and the length of a connecting line inside the photovoltaic module is shortened.
Further, when the bypass diodes are connected in parallel separately in a flying line manner in the prior art, the bypass diodes connected in parallel separately and other bypass diodes are designed in a diagonal line manner, so that the bus bar in the flying line manner is generally positioned between the solar cell group at one side edge and the adjacent solar cell group, the area of the photovoltaic module is relatively increased, and the power generation efficiency of the photovoltaic module is reduced.
In the embodiment of the present invention, since the bypass diode does not need to be connected in a flying wire manner, in the first photovoltaic module 11, there is no bus bar in a flying wire manner between the solar cell string 14 at the first side edge and the adjacent solar cell string 14 (as shown in fig. 1), so as to reduce the distance between the solar cell group 14 at the first side edge and the adjacent solar cell group, thereby reducing the area of the first photovoltaic module 11 and further improving the power generation efficiency of the first photovoltaic module 11 under the condition that the number of the solar cell string groups 14 is the same.
In addition, in the second photovoltaic module 12, since there is no need to separately connect bypass diodes in parallel at the second side edge thereof, there is no bus bar in the form of flying line between the solar cell string group 14 ' at the second side edge thereof and the adjacent solar cell string group 14 ' (as shown in fig. 3), and thus the power generation efficiency of the second photovoltaic module 12 is also improved under the condition that the number of the solar cell string groups 14 ' is the same.
In addition, as shown in fig. 1 to 4, in one embodiment of the present invention, the second bypass diode 17 at the second side edge of the first photovoltaic module 11 is connected to the first connector 15; the second bypass diode 17 'at the first side edge of the second photovoltaic module 12 is connected to the second connector 16'.
In this example, the second side edge of the first photovoltaic module 11 is the left side edge thereof, and the upper end of the solar cell string at the left side edge is the anode, then the second bypass diode 17 at the left side edge of the first photovoltaic module 11 is connected to the anode connector. Correspondingly, the first side edge of the second photovoltaic module 12 is the right side edge thereof, and the upper end of the solar cell string at the right side edge is the cathode, then the second bypass diode 17' at the right side edge in the second photovoltaic module 12 is connected to the cathode connector. Therefore, the photovoltaic power generation device formed by connecting the first photovoltaic module 11 and the second photovoltaic module 12 and the external cable are conveniently conducted through the connectors connected with the left side edge of the first photovoltaic module 11 and the right side edge of the second photovoltaic module 12.
In one embodiment of the present invention, the first photovoltaic module 11 and the second photovoltaic module 12 further respectively comprise: junction boxes 18, 18 ', bus bars 19, 19 ' and connecting wires 20, 20 '; wherein the first bypass diode 3 and the second bypass diode 17, 17 'are arranged in the junction box 18, 18', respectively; the solar cell strings 14, 14 'are connected by the bus bars 19, 19'.
With continued reference to fig. 1, in the first photovoltaic module 11, the outgoing line of the bus bar 19 of the first end of the solar cell string 14 at the first side edge is connected to the first bypass diode 13; the first bypass diode 13 and the second bypass diode 17 at the second side edge are connected to the first connector 15 by connection lines 20, respectively. The connection line 20 is connected at one end to the first connector 15 and at the other end to the junction box 18 where the first bypass diode 13 is located. Accordingly, the outgoing line of the bus bar 19 at the second end of the solar cell string 14 at the first side edge of the first photovoltaic module 11 is connected to the junction box 18 and connected to the second connector 16 through the connecting line 20. The connecting wire 20 is connected at one end to the second connector 16 and at the other end to the junction box 18.
In this embodiment, the first end (upper end) of the solar cell string 14 at the right edge of the first photovoltaic module 11 is connected to the first bypass diode 13 through the lead line of the bus bar 19, since the upper end of the solar cell string 14 is the positive electrode, the bus bar 19 connected to the upper end of the solar cell string 14 is connected to the negative electrode of the first bypass diode 13 through the positive lead line, the first bypass diode 13 is disposed in the junction box 18, and the junction box 18 is disposed with a connection line, so that the first bypass diode 13 can be connected to the positive connector through the connection line 20 in the junction box 18. Similarly, the second end (lower end) of the solar cell string 14 at one side edge of the first photovoltaic module 11 may be connected to the junction box 18 through a negative bus bar lead, and further connected to a negative connector through a connection line 20 in the junction box 18.
Similarly, the first end (upper end) of the solar cell string 14 at the left edge of the first photovoltaic module 11 is connected to the second bypass diode 17 through the outgoing line of the bus bar 19, since the upper end of the solar cell string 14 is the positive electrode, the bus bar 19 connected to the upper end of the solar cell string 14 is connected to the negative electrode of the second bypass diode 17 through the outgoing line of the positive bus bar, the second bypass diode 17 is disposed in the junction box 18, and the junction box 18 is disposed with the connecting line 20, so that the second bypass diode 17 can be connected to the positive connector through the connecting line 20 in the junction box 18.
In the second photovoltaic module 12, similarly to the connection in the first photovoltaic module 11, the junction box 18 'where the second bypass diode 17' at the first side edge is located is connected to the second connector 16 'by a connection line 20'. And the outgoing lines of the bus bars 19 ' at both ends of the solar cell string 14 ' at the second side edge are respectively connected with the junction box 18 ', and the junction box 18 ' is respectively connected with the second connector 16 ' and the first connector 15 ' through the connecting lines 20 ', and a specific connection schematic diagram is shown in fig. 3.
In fig. 3, the second bypass diode 17 'at the right edge of the second photovoltaic module 12 is disposed in the junction box 18', and since the first end (upper end) of the solar cell string 14 'at the right edge of the second photovoltaic module 12 is a cathode, the anode of the second bypass diode 17' is connected to the cathode lead of the bus bar 19 'at the upper end of the solar cell string 14' at the right edge. In addition, the outgoing lines of the bus bars 19 'at the two ends of the solar cell string 14' at the left edge of the second photovoltaic module 12 are also connected to the junction box 18 ', respectively, and since the upper end of the solar cell string 14' at the left edge is a negative electrode, the bus bar 19 'at the upper end is connected to the junction box 18' through the negative outgoing line and is connected to the negative electrode connector through the connection line 20 'of the junction box 18'. Accordingly, the lower end of the solar cell string 14 ' at the left edge is a positive electrode, and the bus bar 19 ' at the lower end is connected to the junction box 18 ' through a positive electrode lead-out wire and is connected to a positive electrode connector through a connection wire 20 ' of the junction box 18 '.
According to the above embodiment, each solar cell string is connected by the bus bar, and the bus bar lead-out wire is connected to the junction box and connected to the connector by the junction box. Thereby facilitating conduction of the current generated by the photovoltaic module and facilitating connection of the photovoltaic module to external wiring.
As described above, the first photovoltaic module 11 and the second photovoltaic module 12 provided by the embodiment of the present invention include an odd number of solar cell strings 14, 14'. That is, the first photovoltaic module 11 and the second photovoltaic module 12 may include 1, 3, or more than 3 solar cell strings 14, 14', respectively.
When the first photovoltaic module 11 and the second photovoltaic module 12 both include 1 solar cell string, the photovoltaic power generation device 10 formed by connecting the first photovoltaic module 11 and the second photovoltaic module 12 only needs to connect 1 first bypass diode in parallel. Of course, in practical applications, in order to ensure the stability of the output voltage of the photovoltaic module and improve the power generation efficiency of the photovoltaic module, one photovoltaic module generally includes at least 3 solar cell strings. In other words, in the embodiment of the present invention, the first photovoltaic module 1 and the second photovoltaic module 2 respectively include at least three solar cell strings 14 and 14'.
Further, in order to facilitate the production of the photovoltaic modules and the assembly of the photovoltaic power generation apparatus 10, the first photovoltaic module 11 and the second photovoltaic module 12 respectively include the same number of solar cell strings 14, 14'. As shown in fig. 1 to 4, the first photovoltaic module 11 and the second photovoltaic module 12 respectively include 5 solar cell string groups 14, 14'. Of course, the number of the solar cell strings 14 and 14' included in the first photovoltaic module 11 and the second photovoltaic module 12 may be different. For example, the first photovoltaic module 11 includes 5 solar cell strings 14, and the second photovoltaic module 12 includes 7 solar cell strings 14'.
Wherein each solar cell string group 14, 14' in the first photovoltaic module 11 and the second photovoltaic module 12 may include one solar cell string or at least two solar cell strings connected in parallel with each other, each of the solar cell strings includes: and the solar cells are connected in series. The solar cell can be a sliced solar cell.
Fig. 1 to 4 can be referred to when each of the solar cell string groups 14, 14' of the first photovoltaic module 11 and the second photovoltaic module 12 includes one solar cell string. In this example, one solar cell string group 14, 14' is one solar cell string, and each solar cell string includes 10 cells.
In another embodiment of the present invention, referring to fig. 7 to 12, the first photovoltaic module 11 and the second photovoltaic module 12 respectively include 5 solar cell string sets 14, 14 ', and each solar cell string set 14, 14' includes two solar cell strings connected in parallel. In this example, as shown in fig. 7 and 8, the first photovoltaic module 11 includes 5 solar cell string groups, each solar cell string group 14 includes two solar cell strings connected in parallel, and each solar cell string includes 9 cell pieces. Likewise, referring to fig. 9 and 10, the second photovoltaic module 12 also includes 5 solar cell string sets, each solar cell string set 14' includes two solar cell strings connected in parallel, and each solar cell string includes 9 cells.
When the solar cell string group 14, 14 'includes a plurality of solar cell strings connected in parallel, the number of the solar cell strings included in each of the solar cell string groups 14, 14' in the first photovoltaic module 11 and the second photovoltaic module 12 is the same. For example, in fig. 7 and 8, each solar cell string group 14 in the first photovoltaic module 11 includes two solar cell strings, each of which is 2 in number; in fig. 9 and 10, each solar cell string group 14' in the second photovoltaic module 12 includes two solar cell strings, each of which is also 2. Thereby ensuring that the output current of each solar cell string is the same to ensure the circuit safety of the first photovoltaic module 11 and the second photovoltaic module 12.
It is to be understood that whether the solar cell string groups 14, 14 ' include only one solar cell string, or include a plurality of solar cell strings connected in parallel, the connection of the solar cell string group 14 at one side edge of the first photovoltaic module 11 to the first bypass diode 13, the connection of the other solar cell string groups 14 at the other side edge to the second bypass diode 17, the connection of the other solar cell string groups 14 ' at the other side edge of the second photovoltaic module 12 to the second bypass diode 17 ', and the first and second photovoltaic modules 11, 12 are the same. Therefore, in the case that the solar cell set 14, 14 'shown in fig. 7 to 12 includes two solar cell strings connected in parallel, the connection manner can refer to the above description (shown in fig. 1 to 6) that the solar cell set 14, 14' includes only one solar cell string, and is not repeated herein.
In summary, according to the technical solution of the embodiment of the present invention, at least the following beneficial effects can be achieved:
1. the first end of the solar cell string group at one side edge of the first photovoltaic module is connected with the first connector through the first bypass diode, and the second end of the solar cell string group is connected with the second connector. In addition, the solar cell string group at one edge of the second photovoltaic module does not need to be connected with a bypass diode in parallel independently, and only the second connector and the first connector are connected to two ends of the solar cell string group at the edge respectively, so that the first photovoltaic module and the second photovoltaic module can be connected through the first connector and the second connector at the edge to form the photovoltaic power generation device. In the photovoltaic power generation device, the solar cell string groups at the edges of the first photovoltaic module and the second photovoltaic module are connected with the first bypass diode in parallel, namely the solar cell string groups at the edges of the first photovoltaic module and the second photovoltaic module share the first bypass diode. Therefore, the number of bypass diodes in the photovoltaic module comprising an odd number of solar cell strings is reduced, the materials used by the photovoltaic module are saved, and the cost of the photovoltaic module is reduced.
2. The same ends of the first photovoltaic module and the second photovoltaic module are connected through the two connectors with opposite polarities, the operation is simple, the implementation is easy, the first photovoltaic module and the second photovoltaic module 12 can be conveniently assembled to form a photovoltaic power generation device, the length of a connecting line between the first photovoltaic module and the second photovoltaic module can be shortened, and materials used by the photovoltaic modules are further saved.
3. In the first photovoltaic module and the second photovoltaic module, the bus bars in the flying line form are not required to be independently connected with the bypass diodes in parallel, so that the length of the connecting lines in the first photovoltaic module and the second photovoltaic module is shortened, the area of the first photovoltaic module and the area of the second photovoltaic module are reduced, and the power generation efficiency of the first photovoltaic module and the power generation efficiency of the second photovoltaic module are improved.
The above-described embodiments should not be construed as limiting the scope of the invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions can occur, depending on design requirements and other factors. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (10)
1. A photovoltaic power generation device (10), characterized by comprising: a first photovoltaic module (11) and a second photovoltaic module (12); wherein the content of the first and second substances,
the first photovoltaic module (11) and the second photovoltaic module (12) each comprise: an odd number of solar cell strings (14, 14 '), first connectors (15, 15 ') and second connectors (16, 16 ') connected in series with each other; the first connector (15, 15 ') and the second connector (16, 16') are of opposite polarity;
the first photovoltaic module (11) further comprises a first bypass diode (13), the first bypass diode (13) being disposed at a first lateral edge of the first photovoltaic module (11);
in the first photovoltaic module (11), a first end of the solar cell string (14) at the first side edge is connected to the first connector (15) through the first bypass diode (13), and a second end of the solar cell string (14) at the first side edge is connected to the second connector (16);
in the second photovoltaic module (12), both ends of the solar cell string (14 ') at the second side edge are connected with the first connector (15 ') and the second connector (16 '), respectively; the first side edge and the second side edge are opposite;
the first photovoltaic module (11) and the second photovoltaic module (12) are connected by the first connector (15, 15 ') and the second connector (16, 16 '), so that the solar cell string (14, 14 ') at one side edge of the first photovoltaic module (11) and the second photovoltaic module (12) is connected in parallel with the first bypass diode (13).
2. Photovoltaic power generation device (10) according to claim 1,
a first end of the string of solar cells (14 ') at a second side edge of the second photovoltaic module (12) is connected to the second connector (16') and a second end of the string of solar cells (14 ') at the second side edge is connected to the first connector (15'); the first end of the solar cell string (14') at the second side edge of the second photovoltaic module (12) is opposite in polarity to the first end of the solar cell string (14) at the first side edge of the first photovoltaic module (11).
3. Photovoltaic power generation device (10) according to claim 1,
the first photovoltaic module (11) and the second photovoltaic module (12) further comprise respectively: a second bypass diode (17, 17');
and in other solar cell string groups (14, 14 ') in the first photovoltaic module (11) except the first side edge and in the second photovoltaic module (12) except the second side edge, each pair of the solar cell string groups (14, 14 ') is connected with one second bypass diode (17, 17 ') in parallel.
4. Photovoltaic power generation device (10) according to claim 3,
the first bypass diode (13) and the second bypass diode (17) in the first photovoltaic module (11) are located at the same end of the solar cell string (14).
5. Photovoltaic power generation device (10) according to claim 3,
the second bypass diode (17) at the second side edge of the first photovoltaic module (11) is connected to the first connector (15);
the second bypass diode (17 ') at the first side edge of the second photovoltaic module (12) is connected to the second connector (16').
6. Photovoltaic power generation device (10) according to claim 3,
the first photovoltaic module (11) and the second photovoltaic module (12) further comprise respectively: a junction box (18, 18 '), a busbar (19, 19 ') and a connecting line (20, 20 '); wherein the content of the first and second substances,
the first bypass diode (13) and the second bypass diode (17, 17 ') are respectively arranged in the junction box (18, 18');
the solar cell string groups (14, 14 ') are connected through the bus bars (19, 19');
in the first photovoltaic module (11), the outgoing line of the bus bar (19) at the first end of the solar cell string (14) at the first side edge is connected to the first bypass diode (13); the junction boxes (18) where the first bypass diode (13) and the second bypass diode (17) at the second side edge are located are respectively connected with the first connector (15) through the connecting wires (20);
in the second photovoltaic module (12), the junction box (18 ') in which the second bypass diode (17') is located at the first side edge is connected to the second connector (16 ') by the connection line (20').
7. Photovoltaic power generation device (10) according to claim 6,
in the first photovoltaic module (11), the outgoing line of the bus bar (19) at the second end of the solar cell string (14) at the first side edge is connected with the junction box (18), and the junction box (18) is connected with the second connector (16) through the connecting line (20);
in the second photovoltaic module (12), the outgoing lines of the bus bars (19 ') at both ends of the solar cell string (14 ') at the second side edge are connected to the junction box (18 '), respectively, and the junction box (18 ') is connected to the second connector (16 ') and the first connector (15 ') through the connection lines (20 '), respectively.
8. Photovoltaic power generation device (10) according to claim 1,
the first photovoltaic module (11) and the second photovoltaic module (12) respectively comprise the same number of solar cell strings (14, 14').
9. Photovoltaic power generation device (10) according to claim 1,
the solar cell string set (14, 14') includes: one solar cell string or at least two solar cell strings connected in parallel to each other, each of the solar cell strings comprising: and the solar cells are connected in series.
10. Photovoltaic power generation device (10) according to claim 9,
the number of the solar cell strings in each solar cell string group (14, 14') in the first photovoltaic module (11) and the second photovoltaic module (12) is the same.
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| CN115693963A (en) * | 2023-01-04 | 2023-02-03 | 安徽大恒新能源技术有限公司 | Intelligent assembly |
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Effective date of registration: 20220610 Address after: 1 Jianhua Road, Yangzhou Economic Development Zone, Jiangsu Province Applicant after: Jingao (Yangzhou) new energy Co.,Ltd. Address before: 1 Jianhua Road, Yangzhou Economic Development Zone, Jiangsu Province Applicant before: JA SOLAR TECHNOLOGY YANGZHOU Co.,Ltd. |