CN114640128A - Photovoltaic power supply system - Google Patents
Photovoltaic power supply system Download PDFInfo
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- CN114640128A CN114640128A CN202210143562.6A CN202210143562A CN114640128A CN 114640128 A CN114640128 A CN 114640128A CN 202210143562 A CN202210143562 A CN 202210143562A CN 114640128 A CN114640128 A CN 114640128A
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- 238000003491 array Methods 0.000 claims abstract description 126
- 238000010248 power generation Methods 0.000 claims abstract description 89
- 230000005540 biological transmission Effects 0.000 claims description 60
- 238000009413 insulation Methods 0.000 claims description 22
- 230000002265 prevention Effects 0.000 claims description 21
- 229910002601 GaN Inorganic materials 0.000 claims description 3
- JMASRVWKEDWRBT-UHFFFAOYSA-N Gallium nitride Chemical compound [Ga]#N JMASRVWKEDWRBT-UHFFFAOYSA-N 0.000 claims description 3
- 230000005669 field effect Effects 0.000 claims description 3
- 239000003292 glue Substances 0.000 claims description 3
- 239000012774 insulation material Substances 0.000 claims description 3
- 239000012528 membrane Substances 0.000 claims description 3
- 229910044991 metal oxide Inorganic materials 0.000 claims description 3
- 150000004706 metal oxides Chemical class 0.000 claims description 3
- 239000004065 semiconductor Substances 0.000 claims description 3
- 238000004519 manufacturing process Methods 0.000 abstract description 8
- 230000002035 prolonged effect Effects 0.000 abstract description 6
- 230000002159 abnormal effect Effects 0.000 abstract description 5
- 239000011521 glass Substances 0.000 description 15
- 238000010586 diagram Methods 0.000 description 9
- 239000003990 capacitor Substances 0.000 description 5
- 239000012141 concentrate Substances 0.000 description 4
- 238000004891 communication Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 230000009466 transformation Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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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
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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
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The application provides a photovoltaic power supply system, which comprises a plurality of photovoltaic arrays, a plurality of wiring devices and at least one confluence device, wherein the number of photovoltaic power generation units in each photovoltaic array in the photovoltaic arrays is less than or equal to the ratio of the maximum working current to the rated working current of the photovoltaic power generation units; the collecting device is used for transmitting the output current of each photovoltaic array to a load through the wiring device connected with each photovoltaic array. By the aid of the photovoltaic power generation system, abnormal working current borne by the photovoltaic power generation unit when short circuit occurs does not exceed the maximum working current, safety of the photovoltaic power supply system is improved, and service life of the photovoltaic power supply system is prolonged. Simultaneously, adopt this application can so that a photovoltaic array can include as many photovoltaic power generation units as possible, and then increase photovoltaic power generation area of photovoltaic power supply system, promote power supply efficiency, reduction in production cost.
Description
Technical Field
The application relates to the technical field of power electronics, in particular to a photovoltaic power supply system.
Background
With the development of the power electronic technology field, in order to better convert solar energy into electric energy, in the photovoltaic power supply field, a photovoltaic power supply device (e.g., a photovoltaic array) in a photovoltaic power supply system is generally integrally installed at a fixed position (e.g., the photovoltaic array is arranged in the glass of a building) so as to convert received light energy or solar energy into electric energy through the photovoltaic power supply device to supply power to a load. The power supply power of the photovoltaic power supply equipment is related to the area of the photovoltaic power supply equipment (for example, related to the area of a power generation device in the photovoltaic power supply equipment) which can receive light energy or solar energy. However, since a photovoltaic power supply apparatus (e.g., a photovoltaic array) is generally composed of a plurality of photovoltaic power generation units connected, for example, the plurality of photovoltaic power generation units are connected in parallel, and the output (e.g., output current) after the parallel connection is used as the output of the photovoltaic array to supply power to a load. When one photovoltaic power generation unit is in short circuit, because the internal resistance of the short-circuited photovoltaic power generation unit is reduced, the output currents of other photovoltaic power generation units flow to the short-circuited photovoltaic power generation unit, that is, the short-circuited photovoltaic power generation unit bears the short-circuit currents from other photovoltaic power generation units in the power generation device, the current value of the short-circuit current generally far exceeds the maximum working current which can be borne by the single photovoltaic power generation unit, the damage of photovoltaic power supply equipment is easily caused, and the safety of a photovoltaic power supply system is low.
Disclosure of Invention
The application provides a photovoltaic power supply system, can be so that the unusual operating current that photovoltaic power generation unit bore when taking place the short circuit does not exceed maximum operating current, promote photovoltaic power supply system's security, extension photovoltaic power supply system life can also make a photovoltaic array can include as many photovoltaic power generation units as possible simultaneously, and then increase photovoltaic power generation system's photovoltaic power generation area, promote power supply efficiency, reduction in production cost.
In a first aspect, the present application provides a photovoltaic power system including a plurality of photovoltaic arrays, a plurality of wiring devices, and at least one bus device. Here, the plurality of photovoltaic power generation units included in one of the plurality of photovoltaic arrays may be connected in parallel to one of the plurality of wiring devices, and the number of photovoltaic power generation units included in each of the plurality of photovoltaic arrays is less than or equal to a ratio of a maximum operating current and a rated operating current of the photovoltaic power generation units. Each photovoltaic array in the plurality of photovoltaic arrays can be connected in parallel to the input end of the junction device through the junction device connected with each photovoltaic array, and the output end of the junction device can be connected with a load. Here, the bus bar device may be used to transfer the output current of each photovoltaic array to a load through a wiring device connected to each photovoltaic array.
In the embodiments provided herein, a photovoltaic array in a photovoltaic power supply system may include a plurality of photovoltaic power generation units. Here, the number of the photovoltaic power generation units is less than or equal to a ratio of a maximum operating current and a rated operating current of the photovoltaic power generation units. It can be understood that if the maximum operating current of a photovoltaic power generation unit is K times the rated operating current, a photovoltaic array can contain K photovoltaic power generation units at most (where K is a natural number, and when K is not an integer, it is rounded down). That is, the photovoltaic power supply system can limit the number of photovoltaic power generation units in each photovoltaic array, thereby ensuring that, in one photovoltaic array, if one photovoltaic power generation unit fails in a short circuit, the fault operating current in the short-circuited photovoltaic power generation unit (for example, the current converged from the output currents of other non-failed photovoltaic power generation units to the short-circuited photovoltaic power generation unit) does not exceed the maximum operating current of the photovoltaic power generation unit (that is, does not exceed the maximum operating current that the photovoltaic power generation unit can bear). Meanwhile, each photovoltaic array in the photovoltaic arrays can be connected in parallel to the junction device through the junction device connected with each photovoltaic array, and the output current of each photovoltaic array is transmitted to a load through the junction device and the junction device. By adopting the embodiment provided by the application, the abnormal working current borne by the photovoltaic power generation unit when short circuit occurs is not more than the maximum working current, the safety of the photovoltaic power supply system is improved, the service life of the photovoltaic power supply system is prolonged, and meanwhile, one photovoltaic array can comprise as many photovoltaic power generation units as possible, so that the photovoltaic power generation area of the photovoltaic power supply system is increased, the power supply efficiency is improved, and the production cost is reduced.
With reference to the first aspect, in a first possible implementation manner, the bus device may include a plurality of backflow prevention modules, and one wiring device of the plurality of wiring devices may be connected to the bus device through one backflow prevention module of the plurality of backflow prevention modules. The positive pole of each wiring device in the plurality of wiring devices can be connected with the positive pole input end of the bus device through each backflow prevention module in the plurality of backflow prevention modules, and the negative pole of each wiring device can be connected with the negative pole input end of the bus device. Here, the bus device can be used for preventing other photovoltaic arrays which are not short-circuited from outputting current to any short-circuited photovoltaic array through each backflow prevention module when any photovoltaic array is short-circuited. It can be understood that when a short circuit occurs in a photovoltaic power generation unit in one photovoltaic array, the equivalent resistance of the failed photovoltaic array becomes smaller, and at this time, the output current of other photovoltaic arrays without the short circuit of the photovoltaic power generation unit is likely not to flow to the load, but is back-perfused into the failed photovoltaic array, which not only prevents the photovoltaic power supply system from supplying power to the load, but also endangers the safety of elements in the photovoltaic system (e.g., the photovoltaic power generation unit in the failed photovoltaic array). By adopting the embodiment provided by the application, the confluence device can prevent other photovoltaic arrays which are not short-circuited from outputting current to the photovoltaic arrays of any short circuit through each backflow prevention module when any photovoltaic array is short-circuited, so that the safety of a photovoltaic power supply system is improved, the service life of the photovoltaic power supply system is prolonged, the output current of each photovoltaic array is ensured to be normally transmitted to a load, and the stability and the working efficiency of the photovoltaic power supply system are improved.
With reference to the first aspect or the first possible implementation manner of the first aspect, in a second possible implementation manner, the backflow prevention module may be a diode, a metal oxide semiconductor field effect transistor MOSFET, a gallium nitride transistor GaNHEMT, or an insulated gate bipolar transistor IGBT, and element selection and application scenarios of the photovoltaic power supply system are enriched.
With reference to the first aspect, the first possible implementation manner of the first aspect, or the second possible implementation manner of the first aspect, in a third possible implementation manner, the photovoltaic power supply system may further include a plurality of sets of transmission lines, and one photovoltaic array of the plurality of photovoltaic arrays may be connected to one wiring device of the plurality of wiring devices through one transmission line of the plurality of sets of transmission lines. Here, each photovoltaic array of the photovoltaic power supply system may be symmetrically arranged in the photovoltaic power supply system to form a photovoltaic array group, the wiring devices corresponding to each photovoltaic array may be symmetrically arranged at the edge of each side of the photovoltaic array group, and the transmission lines corresponding to each photovoltaic array do not overlap. The photovoltaic arrays of the photovoltaic power supply system are symmetrically arranged in the photovoltaic power supply system, and the arrangement may include axisymmetric arrangement, centrosymmetric arrangement, or other arrangement modes in which transmission lines corresponding to the photovoltaic arrays do not overlap. It can be understood that when one pv array group includes two pv arrays, the two pv arrays may be laterally symmetrically arranged, and accordingly, the wiring devices corresponding to the two pv arrays may be symmetrically arranged at the left and right edges of the pv array group (or the wiring devices corresponding to the two pv arrays may be simultaneously symmetrically arranged at the upper or lower edges of the pv array group), so that the transmission lines corresponding to the pv arrays do not overlap; or, two photovoltaic arrays can be arranged longitudinally and symmetrically, and correspondingly, the wiring devices corresponding to the two photovoltaic arrays can be symmetrically arranged at the upper side and the lower side edges of the photovoltaic array group (or the wiring devices corresponding to the two photovoltaic arrays can be simultaneously and symmetrically arranged at the left side or the right side edge of the photovoltaic array group), so that the transmission lines corresponding to the photovoltaic arrays are not overlapped. It can be further understood that when a photovoltaic array group includes more than two photovoltaic arrays, each photovoltaic array can be expanded and arranged according to the symmetrical arrangement mode of two pairs when one photovoltaic array group includes two photovoltaic arrays, and also can be arranged according to the central symmetrical mode, and meanwhile, the wiring devices corresponding to each photovoltaic array can be symmetrically arranged at the edge of each side of the photovoltaic array group, so that the transmission lines corresponding to each photovoltaic array are not overlapped.
By adopting the implementation mode provided by the application, the wiring devices corresponding to the photovoltaic arrays can be symmetrically arranged at the edges of each side of the photovoltaic array group, and on the basis of ensuring that the transmission lines corresponding to the photovoltaic arrays do not have overlapping, the arrangement mode is flexible and various, the photovoltaic power supply system can adapt to different application scenes, and the applicability of the photovoltaic power supply system is improved.
With reference to the first aspect, the first possible implementation manner of the first aspect, or the second possible implementation manner of the first aspect, in a fourth possible implementation manner, the photovoltaic power supply system may further include multiple sets of transmission lines, and one photovoltaic array of the multiple photovoltaic arrays may be connected to one wiring device of the multiple wiring devices through one transmission line of the multiple sets of transmission lines. Here, each photovoltaic array of the photovoltaic power supply system may be arranged in parallel in the photovoltaic power supply system to form a photovoltaic array group, the wiring devices corresponding to at least two photovoltaic arrays in the photovoltaic array group may be arranged at the same side edge of the photovoltaic array group, and the overlapping portions of the transmission lines corresponding to each photovoltaic array may be subjected to insulation treatment. The photovoltaic arrays of the photovoltaic power supply system may be arranged in parallel in the photovoltaic power supply system, and the arrangement may include transverse arrangement, longitudinal arrangement, or other arrangement in which transmission lines corresponding to the photovoltaic arrays are overlapped. Here, the wiring devices corresponding to the respective pv arrays may be collectively arranged at the same side edge of the pv array group, or may be collectively arranged at multiple side edges of the pv array group. It can be understood that when one photovoltaic array group comprises two photovoltaic arrays, the two photovoltaic arrays can be transversely arranged in parallel, correspondingly, the wiring devices corresponding to the two photovoltaic arrays can be uniformly and intensively arranged at the left side or the right side edge of the photovoltaic array group, and the overlapped parts of the transmission lines corresponding to the photovoltaic arrays can be subjected to insulation treatment; or, two photovoltaic arrays can be arranged in parallel longitudinally, correspondingly, the wiring devices corresponding to the two photovoltaic arrays can be arranged at the edges of the upper side or the lower side of the photovoltaic array group in a concentrated manner, and the overlapped parts of the transmission lines corresponding to the photovoltaic arrays can be subjected to insulation treatment. It can be further understood that, when one photovoltaic array group includes more than two photovoltaic arrays, each photovoltaic array may be expanded and arranged in a transverse or longitudinal parallel arrangement mode when the one photovoltaic array group includes two photovoltaic arrays, or may be arranged in parallel in a transverse N photovoltaic arrays and longitudinal M photovoltaic arrays (where N and M are integers), and meanwhile, the wiring devices corresponding to each photovoltaic array may be uniformly and intensively arranged at the same side edge of the photovoltaic array group, or respectively intensively arranged at multiple side edges of the photovoltaic array group, and overlapping portions of the transmission lines corresponding to each photovoltaic array may be subjected to insulation treatment.
Adopt the embodiment that this application provided, termination that each photovoltaic array corresponds can concentrate in unison and lay in the same one side edge of photovoltaic array group or concentrate respectively and lay in the multi-side edge of photovoltaic array group, simultaneously, can do insulating treatment to the part of overlap in the transmission line that each photovoltaic array corresponds, when guaranteeing safe insulation between the transmission line that each photovoltaic array corresponds, the mode of arranging is nimble various, can adapt to different application scenes, has improved photovoltaic power supply system's suitability.
With reference to the fourth possible implementation manner of the first aspect, in a fifth possible implementation manner, the distance between any two groups of transmission lines in the overlapped part of the transmission lines corresponding to each photovoltaic array may be greater than or equal to the insulation distance, and the overlapped part of the transmission lines corresponding to each photovoltaic array may be wrapped with an insulation material membrane or may be filled with an insulation glue, so as to implement insulation processing on the overlapped part of the transmission lines corresponding to each photovoltaic array, enrich the insulation processing manner of the transmission lines in the photovoltaic power supply system, and further improve the applicability of the photovoltaic power supply system.
With reference to the first aspect or any one of the first possible implementation manner to the fifth possible implementation manner of the first aspect, in a sixth possible implementation manner, the photovoltaic power supply system may further include a converter circuit, and the output end of the junction device is connected to the load through the converter circuit.
With reference to the sixth possible implementation manner of the first aspect, in a seventh possible implementation manner, the photovoltaic power supply system may further include a dc bus, and the output end of the junction device may be connected to the inverter circuit through the dc bus.
With reference to the seventh possible implementation manner of the first aspect, in an eighth possible implementation manner, the photovoltaic power supply system may further include a transformer, and the variable current circuit may be connected to the load through the transformer.
In combination with the eighth possible implementation manner of the first aspect, in a ninth possible implementation manner, the photovoltaic power supply system may further include a grid-connected and off-grid wiring device, and the transformer may be connected to the load through the grid-connected and off-grid wiring device.
In the application, the connection mode of the confluence device and the load in the photovoltaic power supply system is flexible, the composition mode of the functional modules in the photovoltaic power supply system is various and flexible, the diversity of the application scene of the photovoltaic power supply system can be improved, and the adaptability of the photovoltaic power supply system is enhanced.
Drawings
Fig. 1 is a schematic view of an application scenario of a photovoltaic power supply system provided in the present application;
fig. 2 is a schematic structural diagram of a photovoltaic power supply system provided by the present application;
FIG. 3 is a schematic view of a plurality of photovoltaic arrays in connection with a bus bar as provided herein;
FIG. 4 is a schematic view of another connection of a plurality of photovoltaic arrays to a bus bar as provided herein;
FIG. 5 is a schematic view of another configuration of a photovoltaic power system provided herein;
FIG. 6 is another schematic diagram of a photovoltaic power system provided by the present application;
fig. 7 is another schematic structural diagram of the photovoltaic power supply system provided in the present application.
Detailed Description
Solar energy is an inexhaustible and pollution-free green energy given by the nature, in other words, solar energy is a clean and renewable new energy source and has a wide role in life and work of people, and one of the energy is to convert solar energy into electric energy. Solar energy power generation can divide into solar-thermal power generation and photovoltaic power generation, and the power supply system that this application provided can be based on solar photovoltaic power generation's power supply system. The solar photovoltaic power generation has the characteristics of no moving parts, no noise, no pollution, high reliability and the like, and has a good application prospect in a communication power supply system in a remote area. In the field of photovoltaic power supply, a photovoltaic power supply device (e.g., a photovoltaic array) in a photovoltaic power supply system may be integrally installed at a fixed location (e.g., the photovoltaic array is disposed in the glass of a building) to convert received light energy or solar energy into electric energy through the photovoltaic power supply device to supply power to a load. The photovoltaic power supply system provided by the application can be suitable for photovoltaic power generation devices in building glass, bridge floor glass, pavement glass or other buildings or facilities, can be determined according to actual application scenes, and is not limited here.
Referring to fig. 1, fig. 1 is a schematic view of an application scenario of a photovoltaic power supply system provided in the present application. As shown in fig. 1, the photovoltaic power system may include a plurality of photovoltaic arrays, a plurality of wiring devices, and at least one bus device. It is to be understood that the photovoltaic array herein may be disposed in building glass, deck glass, pavement glass, or other building or photovoltaic power generation devices. The photovoltaic power supply system is suitable for power supply of base station equipment in remote areas without commercial power or poor commercial power, or power supply of storage batteries, or power supply of various types of electric equipment such as household equipment (such as refrigerators, air conditioners and the like), can be specifically determined according to actual application scenes, and is not limited here. It is further understood that the load in fig. 1 may be a power grid, a battery, a utility of a building, a lighting of a bridge, or other utility. For convenience of description, the photovoltaic power supply system provided by the present application will be exemplarily described below by taking a photovoltaic array arranged on building glass as an example for supplying power to a power grid. The power grid may include electric devices or power transmission devices such as transmission lines, power transfer stations, storage batteries, communication base stations, or household devices.
In the photovoltaic power supply system shown in fig. 1, each of the plurality of photovoltaic arrays may be connected in parallel to an input of a junction device connected to each of the photovoltaic arrays, and an output of the junction device may be connected to a load. Here, the bus bar device may be used to transfer the output current of each photovoltaic array to a load through a wiring device connected to each photovoltaic array. Here, the photovoltaic array includes a plurality of photovoltaic power generation units (as shown in a gray frame portion in the figure), and the photovoltaic power supply system can further ensure that, in one photovoltaic array, if one photovoltaic power generation unit fails in a short circuit, a fault operating current in the photovoltaic power generation unit with the short circuit fault (for example, a current converged from output currents of other photovoltaic power generation units without faults to the photovoltaic power generation unit with the short circuit) does not exceed a maximum operating current of the photovoltaic power generation unit (that is, does not exceed a maximum operating current that the photovoltaic power generation unit can bear). Meanwhile, each photovoltaic array in the photovoltaic arrays can be connected in parallel to the junction device through the junction device connected with each photovoltaic array, and the output current of each photovoltaic array is transmitted to a load through the junction device and the junction device. Therefore, abnormal working current borne by the photovoltaic power generation unit when short circuit occurs does not exceed the maximum working current, safety of the photovoltaic power supply system is improved, the service life of the photovoltaic power supply system is prolonged, meanwhile, one photovoltaic array can comprise as many photovoltaic power generation units as possible, photovoltaic power generation area of the photovoltaic power supply system is increased, power supply efficiency is improved, and production cost is reduced.
The photovoltaic power supply system provided by the present application will be exemplified with reference to fig. 2 to 7.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a photovoltaic power supply system provided in the present application. In the photovoltaic power supply system shown in fig. 2, the photovoltaic power supply system may include a plurality of photovoltaic arrays (e.g., photovoltaic array a to photovoltaic array j), a plurality of wiring devices (e.g., wiring device a to wiring device j), and at least one bus bar device. Here, the plurality of photovoltaic power generation units included in one of the plurality of photovoltaic arrays may be connected in parallel to one of the plurality of wiring devices, and the number of photovoltaic power generation units included in each of the plurality of photovoltaic arrays is less than or equal to a ratio of a maximum operating current and a rated operating current of the photovoltaic power generation units. Each photovoltaic array in the plurality of photovoltaic arrays can be connected in parallel to the input end of the junction device through the junction device connected with each photovoltaic array, and the output end of the junction device can be connected with a load. Here, the bus bar device may be used to transfer the output current of each photovoltaic array to a load through a wiring device connected to each photovoltaic array. Here, one photovoltaic array in the photovoltaic power supply system may include a plurality of photovoltaic power generation units. Here, the number of the photovoltaic power generation units is less than or equal to a ratio of a maximum operating current and a rated operating current of the photovoltaic power generation units. It will be appreciated that if the maximum operating current of a photovoltaic power generation unit is K times the rated operating current, then a photovoltaic array may contain up to K photovoltaic power generation units (where K is a natural number and when K is not an integer, then rounding down). That is, the photovoltaic power supply system can limit the number of photovoltaic power generation units in each photovoltaic array, thereby ensuring that, in one photovoltaic array, if one photovoltaic power generation unit fails in a short circuit, the fault operating current in the short-circuited photovoltaic power generation unit (for example, the current converged from the output currents of other non-failed photovoltaic power generation units to the short-circuited photovoltaic power generation unit) does not exceed the maximum operating current of the photovoltaic power generation unit (that is, does not exceed the maximum operating current that the photovoltaic power generation unit can bear). Meanwhile, each photovoltaic array in the photovoltaic arrays can be connected in parallel to the junction device through the wiring device connected with each photovoltaic array, and the output current of each photovoltaic array is transmitted to a load through the wiring device and the junction device.
By adopting the embodiment provided by the application, the abnormal working current borne by the photovoltaic power generation unit when short circuit occurs is not more than the maximum working current, the safety of the photovoltaic power supply system is improved, the service life of the photovoltaic power supply system is prolonged, and meanwhile, one photovoltaic array can comprise as many photovoltaic power generation units as possible, so that the photovoltaic power generation area of the photovoltaic power supply system is increased, the power supply efficiency is improved, and the production cost is reduced.
In some possible embodiments, the confluence device may include a plurality of backflow prevention modules. Referring to fig. 3, fig. 3 is a schematic diagram of a connection relationship between a plurality of photovoltaic arrays and a bus device provided in the present application, as shown in part (a) of fig. 3, one of a plurality of wiring devices (e.g., wiring device a and wiring device b) corresponding to the plurality of photovoltaic arrays (e.g., photovoltaic array a and photovoltaic array b) may be connected to the bus device through one of a plurality of backflow prevention modules. The positive pole of each wiring device in the plurality of wiring devices can be connected with the positive pole input end of the bus device through each backflow prevention module in the plurality of backflow prevention modules, and the negative pole of each wiring device can be connected with the negative pole input end of the bus device. Here, the bus device can be used for preventing other photovoltaic arrays which are not short-circuited from outputting current to any short-circuited photovoltaic array through each backflow prevention module when any photovoltaic array is short-circuited. It can be understood that when a short circuit occurs in a photovoltaic power generation unit in one photovoltaic array, the equivalent resistance of the failed photovoltaic array becomes smaller, and at this time, the output current of other photovoltaic arrays without the short circuit of the photovoltaic power generation unit is likely not to flow to the load, but is back-perfused into the failed photovoltaic array, which not only prevents the photovoltaic power supply system from supplying power to the load, but also endangers the safety of elements in the photovoltaic system (e.g., the photovoltaic power generation unit in the failed photovoltaic array). Here, the backflow prevention module can be a diode, a Metal Oxide Semiconductor Field Effect Transistor (MOSFET), a gallium nitride transistor (GaNHEMT) or an Insulated Gate Bipolar Transistor (IGBT), and element selection and application scenes of the photovoltaic power supply system are enriched. By adopting the embodiment provided by the application, the confluence device can prevent other photovoltaic arrays which are not short-circuited from outputting current to the photovoltaic arrays of any short circuit through each backflow prevention module when any photovoltaic array is short-circuited, so that the safety of a photovoltaic power supply system is improved, the service life of the photovoltaic power supply system is prolonged, the output current of each photovoltaic array is ensured to be normally transmitted to a load, and the stability and the working efficiency of the photovoltaic power supply system are improved.
With continued reference to part (a) of fig. 3, it can be understood that the photovoltaic power supply system may further include a plurality of sets of transmission lines, and one of the plurality of photovoltaic arrays may be connected to one of the plurality of wiring devices through one of the plurality of sets of transmission lines. Here, each photovoltaic array of the photovoltaic power supply system may be symmetrically arranged in the photovoltaic power supply system to form a photovoltaic array group, the wiring devices corresponding to each photovoltaic array may be symmetrically arranged at each side edge of the photovoltaic array group, and the transmission lines corresponding to each photovoltaic array do not overlap. The photovoltaic arrays of the photovoltaic power supply system are symmetrically arranged in the photovoltaic power supply system, and the arrangement may include axisymmetric arrangement, centrosymmetric arrangement, or other arrangement modes in which transmission lines corresponding to the photovoltaic arrays do not overlap. As shown in part (a) of fig. 3, when one pv array group includes two pv arrays (i.e., pv array a and pv array b), the two pv arrays may be arranged laterally symmetrically, and accordingly, the wiring devices corresponding to the two pv arrays (i.e., wiring device a and wiring device b) may be arranged symmetrically at the left and right edges of the pv array group (or the wiring devices corresponding to the two pv arrays may be arranged symmetrically at the upper or lower edges of the pv array group at the same time, not shown in the figure), so that the transmission lines corresponding to the respective pv arrays do not overlap. Or as shown in part (b) of fig. 3, when one pv array group includes two pv arrays (i.e., pv array a and pv array b), the two pv arrays may be arranged longitudinally and symmetrically, and accordingly, the wiring devices corresponding to the two pv arrays (i.e., wiring device a and wiring device b) may be arranged symmetrically at the upper and lower edges of the pv array group (or the wiring devices corresponding to the two pv arrays may be arranged symmetrically at the left or right edges of the pv array group at the same time, not shown in the figure), so that the transmission lines corresponding to the respective pv arrays do not overlap.
It can be further understood that when one photovoltaic array group includes more than two photovoltaic arrays, each photovoltaic array can be expanded and arranged in a pairwise symmetrical arrangement mode when the photovoltaic array group includes two photovoltaic arrays, and can also be arranged in a centrosymmetric mode, and meanwhile, wiring devices corresponding to each photovoltaic array can be symmetrically arranged at the edge of each side of the photovoltaic array group, so that transmission lines corresponding to each photovoltaic array are not overlapped. In addition, the junction device provided by the application can be an integrated junction device which can uniformly converge the photovoltaic arrays through the wiring devices of the photovoltaic arrays, or can be a dispersed junction device which can divide or hierarchically converge the photovoltaic arrays through the wiring devices of the photovoltaic arrays.
It should be further understood that the arrangement of the photovoltaic arrays and the wiring device recited in the present application is only a part of the feasible arrangement, and other arrangements in which the transmission lines corresponding to the photovoltaic arrays are not overlapped also belong to the protection scope of the present application. In the scene of supplying power for the electric wire netting at the photovoltaic array of laying building glass, this kind of connection arrangement mode can be applicable to the glass edge and have a plurality of circumstances of walking the line interface, and each photovoltaic array's arrangement mode is very nimble, can arrange according to glass's shape, and then increases photovoltaic power generation area of photovoltaic power supply system, promotes power supply efficiency, reduction in production cost. That is to say, adopt the embodiment that this application provided, termination that each photovoltaic array corresponds can be symmetrically laid at each side edge of photovoltaic array group, on the basis of guaranteeing that the transmission line that each photovoltaic array corresponds does not have the overlap, and the mode of arrangement is nimble various, can adapt to different application scenarios, has improved photovoltaic power supply system's suitability.
In some possible embodiments, the wiring devices corresponding to the photovoltaic arrays may be arranged in a concentrated manner, specifically please refer to fig. 4, fig. 4 is another schematic connection relationship diagram of the plurality of photovoltaic arrays and the bus device provided in the present application, as shown in part (a) in fig. 4, the photovoltaic arrays of the photovoltaic power supply system may be arranged in parallel in the photovoltaic power supply system to form a photovoltaic array group, the wiring devices corresponding to at least two photovoltaic arrays in the photovoltaic array group may be arranged at the same side edge of the photovoltaic array group, and the overlapped portion of the transmission lines corresponding to the photovoltaic arrays may be subjected to insulation treatment. The photovoltaic arrays of the photovoltaic power supply system may be arranged in parallel in the photovoltaic power supply system, and the arrangement may include transverse arrangement, longitudinal arrangement, or other arrangement in which transmission lines corresponding to the photovoltaic arrays are overlapped. Here, the wiring devices corresponding to the respective pv arrays may be collectively arranged at the same side edge of the pv array group, or may be collectively arranged at multiple side edges of the pv array group.
As shown in part (a) of fig. 4, when one pv array group includes two pv arrays (i.e., pv array a and pv array b), the two pv arrays may be arranged laterally in parallel, and accordingly, the wiring devices (i.e., wiring device a and wiring device b) corresponding to the two pv arrays may be uniformly and intensively arranged at the left side (not shown) or right side edge of the pv array group, and the overlapped portions of the transmission lines corresponding to the respective pv arrays may be subjected to insulation treatment. Or as shown in part (b) of fig. 4, when one pv array group includes two pv arrays (i.e., pv array a and pv array b), the two pv arrays may be arranged in parallel in the longitudinal direction, and accordingly, the wiring devices (i.e., wiring device a and wiring device b) corresponding to the two pv arrays may be arranged at the edges of the upper side or the lower side (not shown in the figure) of the pv array group in a concentrated manner, and the overlapped portions of the transmission lines corresponding to the respective pv arrays may be subjected to an insulation treatment.
It can be further understood that, when one photovoltaic array group includes more than two photovoltaic arrays, each photovoltaic array may be expanded and arranged in a transverse or longitudinal parallel arrangement mode when the one photovoltaic array group includes two photovoltaic arrays, or may be arranged in parallel in a transverse N photovoltaic arrays and longitudinal M photovoltaic arrays (where N and M are integers), and meanwhile, the wiring devices corresponding to each photovoltaic array may be uniformly and intensively arranged at the same side edge of the photovoltaic array group, or respectively intensively arranged at multiple side edges of the photovoltaic array group, and overlapping portions of the transmission lines corresponding to each photovoltaic array may be subjected to insulation treatment. In addition, the junction device provided by the application can be an integrated junction device which can uniformly converge the photovoltaic arrays through the wiring devices of the photovoltaic arrays, or can be a dispersed junction device which can divide or hierarchically converge the photovoltaic arrays through the wiring devices of the photovoltaic arrays.
It can be further understood that the arrangement modes of the photovoltaic arrays and the wiring devices listed in the present application are only a part of feasible arrangement modes, and other arrangement modes in which the wiring devices corresponding to the photovoltaic arrays are intensively arranged also belong to the protection scope of the present application. In the scene that the photovoltaic arrays arranged on the building glass supply power for the power grid, the connection arrangement mode can be suitable for the condition that one or a small number of wiring interfaces exist on the edge of the glass, the arrangement mode of each photovoltaic array is very flexible, and the photovoltaic arrays can be arranged according to the shape of the glass, so that the photovoltaic power generation area of a photovoltaic power supply system is increased, the power supply efficiency is improved, and the production cost is reduced. Optionally, in the overlapped part of the transmission lines corresponding to each photovoltaic array, the distance between any two groups of transmission lines may be greater than or equal to the insulation distance, and the overlapped part of the transmission lines corresponding to each photovoltaic array may be wrapped with an insulation material membrane or filled with an insulation glue, so as to implement the insulation treatment of the overlapped part of the transmission lines corresponding to each photovoltaic array, enrich the insulation treatment modes of the transmission lines in the photovoltaic power supply system, and further improve the applicability of the photovoltaic power supply system. That is to say, adopt the embodiment that this application provided, termination that each photovoltaic array corresponds can unify concentrate and lay in the same one side edge of photovoltaic array group or concentrate respectively and lay in the multi-side edge of photovoltaic array group, and simultaneously, can do insulating treatment to the part of overlap in the transmission line that each photovoltaic array corresponds, when guaranteeing that safe insulation between the transmission line that each photovoltaic array corresponds, the mode of arranging is nimble various, can adapt to different application scenarios, has improved photovoltaic power supply system's suitability.
Referring to fig. 5, fig. 5 is another schematic structural diagram of the photovoltaic power supply system provided in the present application. The photovoltaic power supply system shown in fig. 5 may further include a current transformation circuit, and the output end of the bus device may be connected to a load through the current transformation circuit. Here, the inverter circuit can convert the output current of the photovoltaic array into a current magnitude matched with the load through the bus device, and transmit the current magnitude to the load. Optionally, in some possible embodiments, as shown in fig. 5, the photovoltaic power supply system may further include a dc bus, and the output end of the junction device may be connected to the load through the dc bus and the inverter circuit. Here, the dc bus may include a bus capacitor or a plurality of bus capacitors connected in series to each other, and may be used for energy storage, for example, as shown in fig. 5, the dc bus includes a bus capacitor C. In the photovoltaic power supply system shown in fig. 5, the converter circuit can convert the electric energy output by the power generation device and stored at two ends of the bus capacitor C, and output corresponding current and voltage to maintain the operation of a load (e.g., a power grid). It can be understood that after the plurality of photovoltaic arrays in the photovoltaic power supply system are connected in parallel to the junction device through the wiring device, the plurality of photovoltaic arrays are directly connected to the converter circuit through the junction device, or connected to the dc bus through the junction device and connected to the converter circuit through the dc bus, which may be specifically set according to an actual application scenario, and is not limited herein.
Referring to fig. 6, fig. 6 is another schematic structural diagram of the photovoltaic power supply system provided in the present application. In the photovoltaic power system shown in fig. 6, the photovoltaic array may be connected to the dc bus through the wiring device and the bus device, and connected to the inverter circuit through the dc bus, and the inverter circuit is connected to the load through the transformer. In other words, the output currents of the plurality of photovoltaic arrays in the power plant may be combined by the wiring device and the combining device (i.e., the plurality of photovoltaic arrays are connected in parallel to the combining device by the wiring device) to provide the input voltage (or input current) to the inverter circuit. The converter circuit can convert the electric energy output by the photovoltaic array and stored at two ends of the bus capacitor C (for example, convert direct current electric energy into alternating current electric energy and boost the voltage preliminarily), and then output corresponding current and voltage to the transformer. The transformer may further step up and transmit the voltage to a load (e.g., a power grid) to maintain the load (e.g., the power grid) in operation.
Referring to fig. 7, fig. 7 is another schematic structural diagram of the photovoltaic power supply system provided in the present application. As shown in fig. 7, the photovoltaic power supply system may further include an off-grid connection device, and the converter circuit may supply power to electric devices or electric power transmission devices in a load (e.g., a power grid) through the off-grid connection device.
In the application, the connection mode of the confluence device and the load in the photovoltaic power supply system is flexible, the composition mode of the functional modules in the photovoltaic power supply system is various and flexible, the diversity of the application scene of the photovoltaic power supply system can be improved, and the adaptability of the photovoltaic power supply system is enhanced. Meanwhile, in any of the photovoltaic power supply systems shown in fig. 1 to 7, the photovoltaic power supply system can ensure that the abnormal working current borne by the photovoltaic power generation unit when short circuit occurs does not exceed the maximum working current, thereby improving the safety of the photovoltaic power supply system, prolonging the service life of the photovoltaic power supply system, and simultaneously, one photovoltaic array can comprise as many photovoltaic power generation units as possible, so that the photovoltaic power generation area of the photovoltaic power supply system is increased, the power supply efficiency is improved, and the production cost is reduced.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and all the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (10)
1. A photovoltaic power supply system is characterized by comprising a plurality of photovoltaic arrays, a plurality of wiring devices and at least one confluence device, wherein a plurality of photovoltaic power generation units included in one of the photovoltaic arrays are connected in parallel to one of the wiring devices, and the number of the photovoltaic power generation units included in each of the photovoltaic arrays is smaller than or equal to the ratio of the maximum working current and the rated working current of the photovoltaic power generation units;
each photovoltaic array in the plurality of photovoltaic arrays is connected in parallel to the input end of the confluence device through a wiring device connected with each photovoltaic array, and the output end of the confluence device is connected with a load;
the junction device is used for transmitting the output current of each photovoltaic array to the load through the wiring device connected with each photovoltaic array.
2. The photovoltaic power supply system according to claim 1, wherein the junction device comprises a plurality of backflow prevention modules, and one of the plurality of wiring devices is connected to the junction device through one of the plurality of backflow prevention modules;
the positive electrode of each wiring device in the plurality of wiring devices is connected with the positive electrode input end of the confluence device through each backflow prevention module in the plurality of backflow prevention modules, and the negative electrode of each wiring device is connected with the negative electrode input end of the confluence device;
the confluence device is used for preventing other photovoltaic arrays which are not short-circuited from outputting current to any short-circuited photovoltaic array through each backflow prevention module when any photovoltaic array is short-circuited.
3. The photovoltaic power supply system according to claim 2, wherein the backflow prevention module is a diode, a Metal Oxide Semiconductor Field Effect Transistor (MOSFET), a gallium nitride transistor (GaNHEMT) or an Insulated Gate Bipolar Transistor (IGBT).
4. The system according to any one of claims 1-3, further comprising a plurality of sets of transmission lines, wherein a photovoltaic array of the plurality of photovoltaic arrays is connected to a wiring device of the plurality of wiring devices via a set of transmission lines of the plurality of sets of transmission lines;
the photovoltaic array group is formed by symmetrically arranging photovoltaic arrays of the photovoltaic power supply system in the photovoltaic power supply system, wiring devices corresponding to the photovoltaic arrays are symmetrically arranged at the edges of all sides of the photovoltaic array group, and transmission lines corresponding to the photovoltaic arrays are not overlapped.
5. The system according to any one of claims 1-3, further comprising a plurality of sets of transmission lines, wherein a photovoltaic array of the plurality of photovoltaic arrays is connected to a wiring device of the plurality of wiring devices via a set of transmission lines of the plurality of sets of transmission lines;
the photovoltaic array group is formed by arranging photovoltaic arrays of the photovoltaic power supply system in parallel, wiring devices corresponding to at least two photovoltaic arrays in the photovoltaic array group are arranged at the edge of the same side of the photovoltaic array group, and the overlapped parts of transmission lines corresponding to the photovoltaic arrays are subjected to insulation treatment.
6. The photovoltaic power supply system according to claim 5, wherein a distance between any two groups of transmission lines in the overlapping portion of the transmission lines corresponding to each photovoltaic array is greater than or equal to an insulation distance, and the overlapping portion of the transmission lines corresponding to each photovoltaic array is wrapped with an insulation material membrane or is filled with an insulation glue, so that the overlapping portion of the transmission lines corresponding to each photovoltaic array is subjected to insulation treatment.
7. The pv power system of any one of claims 1-6 further comprising an inverter circuit, wherein the output of the combiner device is connected to the load via the inverter circuit.
8. The pv power supply system of claim 7 further comprising a dc bus, wherein the output of the combiner device is connected to the inverter circuit via the dc bus.
9. The pv power supply system of claim 8 further comprising a transformer, wherein the converter circuit is connected to the load via the transformer.
10. The photovoltaic power supply system of claim 9, further comprising an off-grid connection through which the transformer connects to the load.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202210143562.6A CN114640128A (en) | 2022-02-16 | 2022-02-16 | Photovoltaic power supply system |
| PCT/CN2022/126646 WO2023155463A1 (en) | 2022-02-16 | 2022-10-21 | Photovoltaic power supply system |
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| CN202210143562.6A CN114640128A (en) | 2022-02-16 | 2022-02-16 | Photovoltaic power supply system |
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| WO2023155463A1 (en) * | 2022-02-16 | 2023-08-24 | 华为数字能源技术有限公司 | Photovoltaic power supply system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8461716B2 (en) * | 2010-08-24 | 2013-06-11 | Sanyo Electric Co., Ltd. | Photovoltaic power generating device, and controlling method |
| JP6075997B2 (en) * | 2012-08-27 | 2017-02-08 | 株式会社日立製作所 | Fault diagnosis method for solar power generation system |
| EP3050117B1 (en) * | 2013-09-27 | 2018-08-29 | ABB Schweiz AG | Combiner box of a dc part of a pv plant |
| CN104836528B (en) * | 2015-04-28 | 2017-03-08 | 北京铂阳顶荣光伏科技有限公司 | Conflux detection method and system, solar power station for header box |
| CN106814265A (en) * | 2015-11-27 | 2017-06-09 | 中国电力科学研究院 | A kind of photovoltaic DC-to-AC converter generating efficiency test system |
| CN112260533A (en) * | 2020-09-11 | 2021-01-22 | 华为技术有限公司 | Direct current combiner box, inverter, photovoltaic system and protection method |
| CN114640128A (en) * | 2022-02-16 | 2022-06-17 | 华为数字能源技术有限公司 | Photovoltaic power supply system |
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| WO2023155463A1 (en) * | 2022-02-16 | 2023-08-24 | 华为数字能源技术有限公司 | Photovoltaic power supply system |
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