CN115037247B - Photovoltaic I-V scanning method and device and photovoltaic system - Google Patents
Photovoltaic I-V scanning method and device and photovoltaic system Download PDFInfo
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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
- H02S50/00—Monitoring or testing of PV systems, e.g. load balancing or fault identification
- H02S50/10—Testing of PV devices, e.g. of PV modules or single PV cells
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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
- 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
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
- H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
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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
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic I-V scanning method, a photovoltaic I-V scanning device and a photovoltaic system, wherein the photovoltaic I-V scanning method is applied to the photovoltaic system, the photovoltaic system comprises a plurality of input devices and a controller, and the photovoltaic I-V scanning method firstly obtains a plurality of maximum operating powers and grid-connected upper limit powers; then determining group information of the input devices according to the maximum operating powers and the grid-connected upper limit power; and finally, performing photovoltaic I-V scanning on all the input devices according to the group information.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic I-V scanning method, a photovoltaic I-V scanning device and a photovoltaic system.
Background
In practical application of photovoltaic Power generation, when a local shadow of a photovoltaic cell panel exists or the light intensity distribution is not uniform, the traditional method may fall into a local optimal Point and cannot track a Maximum Power Point (MPP). In order to solve the problem, an I-V scanning method is commonly used in the industry to diagnose the problems of local damage, shadow and the like of the solar panel array, and a technical scheme of a global maximum power point can be found. Generally, a common scheme of I-V scanning is to collect I-V scanning data by a Power conversion device (for example, an inverter) having an MPPT (Maximum Power Point Tracking) function, upload the I-V scanning data to a server by a collector, and analyze the I-V scanning data by the server to diagnose the solar cell array condition.
However, when I-V scanning data collection is performed on a multi-path PV (Photovoltaic) input device, two schemes are currently used, one is scanning path by path, so that when the number of input paths is large, the total scanning time is long, and the power generation efficiency is affected. Another is to fix several inputs for simultaneous scanning, but when the device output power is limited to less than the maximum power of the several inputs, the scanning may not be successfully completed.
Disclosure of Invention
The technical problem mainly solved by the embodiment of the invention is to provide a photovoltaic I-V scanning method, a photovoltaic I-V scanning device and a photovoltaic system, which can improve the I-V scanning efficiency.
In order to solve the above technical problem, one technical solution adopted by the embodiment of the present invention is: the photovoltaic I-V scanning method is applied to a photovoltaic system, the photovoltaic system comprises a plurality of input devices and a controller, and the photovoltaic I-V scanning method comprises the following steps: acquiring a plurality of maximum operating powers and grid-connected upper limit powers; determining group information of the plurality of input devices according to the plurality of maximum operating powers and the grid-connected upper limit power; and performing photovoltaic I-V scanning on all the input equipment according to the group information.
In some embodiments, the determining group information according to the maximum operating powers and the grid-connected upper limit power includes: determining operating power classes for a plurality of input devices based on the plurality of maximum operating powers; and determining the group information according to the operating power category, the maximum operating powers and the grid-connected upper limit power.
In some embodiments, when the operating power classes are equal to each of the maximum operating powers, the determining the group information according to the operating power classes, the maximum operating powers and the grid-connected upper limit power includes: dividing the grid-connected upper limit power by the maximum operation power to obtain the maximum equipment number of each group; and determining the group information according to the maximum equipment number and the number of the plurality of input equipment.
In some embodiments, when the operating power class is that the maximum operating powers are not equal to each other, the obtaining group information according to the operating power class, the maximum operating powers, and the grid-connected upper limit power includes: and grouping the input devices one by one according to the maximum operating powers and the grid-connected upper limit power to determine the group information.
In some embodiments, the obtaining group information according to the operating power class, the maximum operating powers, and the grid-connected upper limit power includes: determining the same maximum operating power in the plurality of maximum operating powers as the same group, and determining the remaining maximum operating power as a different group; in the same group, dividing the grid-connected upper limit power by the maximum operating power of each same group to obtain the maximum equipment number of each same group, and determining first group information according to the maximum equipment number and the number of a plurality of input equipment; in the different groups, grouping a plurality of input devices one by one according to the maximum operating powers and the grid-connected upper limit power to determine second group information; and obtaining the group information according to the first group information and the second group information.
In some embodiments, after obtaining the maximum operating powers and the grid-connected upper limit power, the photovoltaic I-V scanning method further includes: judging whether at least one of the maximum operating powers is larger than grid-connected upper limit power; if yes, removing the input equipment with the maximum operating power larger than the grid-connected upper limit power, and then determining the group information according to the remaining maximum operating power and the grid-connected upper limit power.
In order to solve the above technical problem, another technical solution adopted by the embodiment of the present invention is: the photovoltaic I-V scanning device is applied to a photovoltaic system, the photovoltaic system comprises a plurality of input devices and a controller, and the photovoltaic I-V scanning device comprises: the acquisition module is used for acquiring a plurality of maximum operating powers and grid-connected upper limit powers; the determining module is used for determining the group information of the input devices according to the maximum operating powers and the grid-connected upper limit power; and the scanning module is used for carrying out photovoltaic I-V scanning on all the input equipment according to the group information.
In some embodiments, the determining module comprises: a first determining unit, configured to determine operating power classes of a plurality of input devices according to the plurality of maximum operating powers; and the second determining unit is used for determining the group information according to the operating power type, the maximum operating powers and the grid-connected upper limit power.
In some embodiments, when the operating power classes are equal to each of the plurality of maximum operating powers, the second determining unit is further configured to: dividing the grid-connected upper limit power by the maximum operation power to obtain the maximum equipment number of each group; and determining the group information according to the maximum equipment number and the number of the plurality of input equipment.
In order to solve the above technical problem, another technical solution adopted by the embodiment of the present invention is: providing a photovoltaic system comprising a plurality of input devices and a controller, the plurality of input devices each being connected to the controller; the controller includes: at least one processor; and a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the photovoltaic I-V scanning method as described above.
The invention provides a photovoltaic I-V scanning method, a photovoltaic I-V scanning device and a photovoltaic system, wherein the photovoltaic I-V scanning method is applied to the photovoltaic system, the photovoltaic system comprises a plurality of input devices and a controller, and the photovoltaic I-V scanning method firstly obtains a plurality of maximum operating powers and grid-connected upper limit powers; then determining group information of the input devices according to the maximum operating powers and the grid-connected upper limit power; and finally, performing photovoltaic I-V scanning on all the input devices according to the group information.
Drawings
One or more embodiments are illustrated in drawings corresponding to, and not limiting to, the embodiments, in which elements having the same reference number designation may be represented as similar elements, unless specifically noted, the drawings in the figures are not to scale.
Fig. 1 is a schematic structural diagram of a photovoltaic system according to an embodiment of the present invention;
fig. 2 is a schematic diagram of a hardware structure of a controller according to an embodiment of the present invention;
FIG. 3 is a schematic flow chart of a photovoltaic I-V scanning method according to an embodiment of the present invention;
FIG. 4 is a schematic flow chart of another photovoltaic I-V scanning method provided by the embodiment of the invention;
FIG. 5 is a flowchart illustrating a method for determining group information of a plurality of input devices according to a plurality of maximum operating powers and a grid-connected upper limit power according to an embodiment of the present invention;
FIG. 6 is a schematic flow chart illustrating the determination of group information when the operating power classes are equal to each other in the maximum operating powers according to the embodiment of the present invention;
FIG. 7 is a schematic flow chart of determining group information when the operating power classes are not completely equal to each other;
fig. 8 is a schematic structural diagram of a photovoltaic I-V scanning apparatus according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.
It should be noted that, if not conflicted, the various features of the embodiments of the invention may be combined with each other within the scope of protection of the invention. Additionally, while functional block divisions are performed in the device diagrams, with logical sequences shown in the flowcharts, in some cases, the steps shown or described may be performed in a different order than the block divisions in the device diagrams, or the flowcharts.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a photovoltaic system according to an embodiment of the present invention. As shown in fig. 1, the photovoltaic system 1000 includes a controller 100 and a plurality of input devices, i.e., an input device 201, an input device 202, an input device 203, an input device 204, and an input device 205, and the controller 100 is connected to the input device 201, the input device 202, the input device 203, the input device 204, and the input device 205, respectively.
It should be noted that the number of input devices is not limited to 5.
The controller 100 first obtains a plurality of maximum operating powers and grid-connected upper limit powers; then, determining group information of a plurality of input devices according to the plurality of maximum operating powers and the grid-connected upper limit power; and finally, performing photovoltaic I-V scanning on all input devices according to the group information. According to the embodiment of the invention, the plurality of input devices are grouped and then grouped for I-V scanning, so that the I-V scanning efficiency can be improved. Wherein the plurality of maximum operating powers refers to a maximum operating power at which each of the plurality of input devices operates. For example, if there are five input devices in the photovoltaic system 1000, the maximum operating powers refer to the maximum operating power of each of the five input devices, and there are five maximum operating powers.
The input device may be a photovoltaic inverter or other power device.
The controller 100 may be a general purpose processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), a PLC, a Field Programmable Gate Array (FPGA), a single chip, an ARM (Acorn RISC Machine) or other programmable logic device, discrete gate or transistor logic, discrete hardware components, or any combination of these components. Also, the controller 100 may be any conventional processor, controller, microcontroller, or state machine. The controller 100 may also be implemented as a combination of computing devices, e.g., a combination of a DSP and a microprocessor, a plurality of microprocessors, one or more microprocessors in conjunction with a DSP core, or any other such configuration.
The controller 100 may be provided independently of the input device, may be incorporated into the input device, or may be a controller existing in the input device itself.
Referring to fig. 2, fig. 2 is a schematic diagram of a hardware structure of a controller according to an embodiment of the present invention. As shown in fig. 2, the controller 100 includes one or more processors 101 and memory 102. In fig. 2, one processor 101 is taken as an example.
The processor 101 and the memory 102 may be connected by a bus or other means, such as by a bus in fig. 2.
The memory 102, which is a non-volatile computer-readable storage medium, may be used for storing non-volatile software programs, non-volatile computer-executable programs, modules, and the like, such as program instructions corresponding to the methods in the following embodiments of the present invention and modules corresponding to the apparatuses in the following embodiments of the present invention. The processor 101 executes various functional applications and data processing of a photovoltaic I-V scanning method by running non-volatile software programs, instructions and modules stored in the memory 102, i.e., implements the functions of one of the following method embodiments and the various modules of the following apparatus embodiments.
The memory 102 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created according to the use of a photovoltaic I-V scanning apparatus, and the like.
Further, the memory 102 may include high speed random access memory, and may also include non-volatile memory, such as at least one magnetic disk storage device, flash memory device, or other non-volatile solid state storage device. In some embodiments, memory 102 includes memory located remotely from processor 101, which may be connected to processor 101 through a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
Program instructions and one or more modules are stored in memory 102 that, when executed by the one or more processors 101, perform the steps of a photovoltaic I-V scanning method in any of the method embodiments described below or implement the functions of the modules of a photovoltaic I-V scanning apparatus in any of the apparatus embodiments described below.
The product can execute the photovoltaic I-V scanning method provided by the following embodiments of the invention, and has corresponding functional modules and beneficial effects of the execution method. For details of the photovoltaic I-V scanning method, which are not described in detail in the present embodiment, reference may be made to the following embodiments of the present invention.
Referring to fig. 3, fig. 3 is a schematic flow chart of a photovoltaic I-V scanning method according to an embodiment of the present invention. The photovoltaic I-V scanning method is applied to a photovoltaic system, the photovoltaic system comprises a plurality of input devices and a controller, and the photovoltaic I-V scanning method comprises the following steps:
s1, obtaining a plurality of maximum operation powers and grid-connected upper limit powers.
In the embodiment of the invention, the controller acquires the maximum operating power and the grid-connected upper limit power of all the input equipment. The maximum operating power is the maximum power that can be achieved when one input device is operating, and the maximum operating power generally takes the rated power of the one input device. The grid-connected upper limit power is the maximum power for simultaneously carrying out photovoltaic I-V scanning, and is usually determined according to the current power grid condition and a power grid scheduling strategy, and the controller can determine the value of the grid-connected upper limit power.
And S2, determining group information of the input devices according to the maximum operating powers and the grid-connected upper limit power.
Wherein the group category information includes a plurality of groups and an input device in each group.
And S3, performing photovoltaic I-V scanning on all input equipment according to the group information.
For the total time of photovoltaic I-V scanning, it is desirable to perform photovoltaic I-V scanning simultaneously for as many input devices as possible. Ideally, when all input devices scan simultaneously, the total time of photovoltaic I-V scanning is the shortest, but when the sum of the powers of the multiple input devices which scan simultaneously exceeds the upper limit of grid-connected power, the I-V scanning cannot be carried out. Therefore, the sum of the powers of the multiple inputs scanned simultaneously must be controlled to ensure that the total power thereof does not exceed the grid-connected power upper limit.
The embodiment of the invention provides a photovoltaic I-V scanning method, which is applied to a photovoltaic system, wherein the photovoltaic system comprises a plurality of input devices and a controller.
Referring to fig. 4, fig. 4 is a schematic flow chart of another photovoltaic I-V scanning method according to an embodiment of the invention.
In some embodiments, after obtaining the plurality of maximum operating powers and the grid-connected upper limit power, the photovoltaic I-V scanning method further includes:
and S4, judging whether at least one of the maximum operating powers is larger than the grid-connected upper limit power.
After the maximum operating power of each online input device is obtained, the input device with the maximum operating power larger than the grid-connected upper limit power needs to be found out and is independently processed.
And S5, if so, removing the input equipment with the maximum operating power larger than the grid-connected upper limit power, and then determining the group information according to the residual maximum operating power and the grid-connected upper limit power.
And if the current maximum operating powers are not more than the grid-connected upper limit power, continuously determining the group information according to the maximum operating powers and the grid-connected upper limit power.
If at least one of the maximum operating powers is larger than the grid-connected upper limit power, removing the input equipment of which the maximum operating power is larger than the grid-connected upper limit power, and determining the group information according to the remaining maximum operating power and the grid-connected upper limit power. And independently performing I-V scanning on the input equipment with the maximum operating power larger than the grid-connected upper limit power by other methods, or suspending the use of the input equipment and sending a notice to a user.
Referring to fig. 5, fig. 5 is a flowchart illustrating a method for determining group information of a plurality of input devices according to a plurality of maximum operating powers and a grid-connected upper limit power according to an embodiment of the present invention.
In some embodiments, determining the group information according to the plurality of maximum operating powers and the grid-connected upper limit power includes:
and S21, determining the operation power classes of the input devices according to the maximum operation powers.
From the values of the maximum operating power of all input devices, the operating power class of all input devices may be determined. The operating power classes include a class in which all maximum operating powers are equal, and a class in which all maximum operating powers are not completely opposite.
And S22, determining group information according to the operation power type, the maximum operation powers and the grid-connected upper limit power.
According to different operating power categories, grouping of the input devices is performed by different methods, so that faster grouping can be realized, and faster photovoltaic I-V scanning can be further realized.
Referring to fig. 6, fig. 6 is a schematic diagram illustrating a process of determining group information when the operating power classes are equal to each other according to an embodiment of the present invention. When the operating power classes are that the maximum operating powers are equal, determining group information according to the operating power classes, the maximum operating powers and the grid-connected upper limit power comprises the following steps:
and step S221, dividing the grid-connected upper limit power by the maximum operation power to obtain the maximum equipment number of each group.
And when the operation power categories are that all the maximum operation powers are equal, dividing the value of the grid-connected upper limit power by the value of the maximum operation power to obtain a quotient, removing the decimal of the quotient, and taking the integer of the quotient as the maximum equipment number of each group.
Step S223, determining group information according to the maximum device number and the number of the plurality of input devices.
For example, when the grid-connected upper limit power is 1000W, the maximum operating power of each input device is 60W, and the number of the plurality of devices is 100, that is, the input device 1, the input device 2, the input device 3, the input device 4, … …, and the input device 100. Then, the quotient of the maximum number of devices being 1000 divided by 60 is an integer, i.e., 16. At this time, the input device 1, the input device 2, … …, and the input device 16 are determined to be the first group, the input device 17, the input device 18, … …, and the input device 32 are determined to be the second group, the input device 33, the input device 34, … …, and the input device 48 are determined to be the third group, the input device 49, the input device 50, … …, and the input device 64 are determined to be the fourth group, the input device 65, the input device 66, … …, and the input device 80 are determined to be the fifth group, the input device 81, the input device 82, … …, and the input device 96 are determined to be the sixth group, and the input device 97, the input device 98, the input device 99, and the input device 100 are determined to be the seventh group. And subsequently, respectively carrying out photovoltaic I-V scanning on the seven groups of input equipment to obtain an I-V curve.
In some embodiments, when the operating power class is that the maximum operating powers are not equal, obtaining the group information according to the operating power class, the maximum operating powers, and the grid-connected upper limit power includes:
and grouping the plurality of input devices one by one according to the maximum operating power and the grid-connected upper limit power of the plurality of input devices to determine the group information.
For example, when the grid-connected upper limit power is 100W, the number of the plurality of devices is 10, the maximum operating power of the input device 1 is 50W, the maximum operating power of the input device 2 is 35W, the maximum operating power of the input device 3 is 20W, the maximum operating power of the input device 4 is 50W, the maximum operating power of the input device 5 is 80W, the maximum operating power of the input device 6 is 50W, the maximum operating power of the input device 7 is 25W, the maximum operating power of the input device 8 is 10W, the maximum operating power of the input device 9 is 80W, and the maximum operating power of the input device 10 is 50W. Then grouping may be done one by one starting with input device 1, i.e. input device 1 and input device 2 are determined as a first group, input device 3 and input device 4 are determined as a second group, input device 5 is determined as a third group, input device 6, input device 7 and input device 8 are determined as a fourth group, input device 9 is determined as a fifth group and input device 10 is determined as a sixth group. And subsequently, respectively carrying out photovoltaic I-V scanning on the six groups of input equipment to obtain an I-V curve.
Referring to fig. 7, fig. 7 is a schematic flowchart illustrating a process of determining group information when the operating power classes are not completely equal to the maximum operating powers according to an embodiment of the present invention.
In some embodiments, obtaining the group information according to the operating power class, the maximum operating powers, and the grid-connected upper limit power includes:
step S222, determining the same maximum operating power of the plurality of maximum operating powers as the same group, and determining the remaining maximum operating power as a different group.
And S224, in the same group, dividing the grid-connected upper limit power by the maximum operating power of each same group to obtain the maximum equipment number of each same group, and determining first group information according to the maximum equipment number and the number of a plurality of input equipment.
Step S226, grouping the plurality of input devices one by one in different groups according to the plurality of maximum operating powers and the grid-connected upper limit power to determine second group information.
And step S228, obtaining group information according to the first group information and the second group information.
For example, when the grid-connected upper limit power is 100W, the number of the plurality of devices is 10, the maximum operating power of the input device 1 is 50W, the maximum operating power of the input device 2 is 35W, the maximum operating power of the input device 3 is 20W, the maximum operating power of the input device 4 is 50W, the maximum operating power of the input device 5 is 80W, the maximum operating power of the input device 6 is 50W, the maximum operating power of the input device 7 is 25W, the maximum operating power of the input device 8 is 10W, the maximum operating power of the input device 9 is 80W, and the maximum operating power of the input device 10 is 50W. Then input device 1, input device 4, input device 6, input device 10 may be determined as a first identical group, input device 5 and input device 9 may be determined as a second identical group, and input device 2, input device 3, input device 7, and input device 8 may be determined as a different group. In the first same group, the maximum number of devices is 2, the input devices 1 and 4 are determined as the first group, and the input devices 6 and 10 are determined as the second group. In the second same group, the maximum number of devices is 1, the input device 5 is determined as the third group, and the input device 9 is determined as the fourth group. Since the sum of the maximum operating powers of the input device 2, the input device 3, the input device 7, and the input device 8 in the different groups is 90W, which is smaller than the grid-connection upper limit power 100W, the input device 2, the input device 3, the input device 7, and the input device 8 are determined as the fifth group. And subsequently, respectively carrying out photovoltaic I-V scanning on the five groups of input equipment to obtain an I-V curve.
When the operation power classes are a plurality of maximum operation powers which are not completely equal, the input devices can be grouped more quickly by the method, and therefore photovoltaic I-V scanning is performed more efficiently.
The embodiment of the invention provides a photovoltaic I-V scanning method, which is applied to a photovoltaic system, wherein the photovoltaic system comprises a plurality of input devices and a controller. The embodiment of the invention divides a plurality of input devices into groups and then divides the groups into groups to carry out I-V scanning, thereby improving the efficiency of I-V scanning.
Referring to fig. 8, fig. 8 is a schematic structural diagram of a photovoltaic I-V scanning apparatus according to an embodiment of the present invention. The photovoltaic I-V scanning apparatus is applied to a photovoltaic system, the photovoltaic system includes a plurality of input devices and a controller, the photovoltaic I-V scanning apparatus 300 includes:
the obtaining module 10 is configured to obtain a plurality of maximum operating powers and grid-connected upper limit powers.
And the determining module 20 is configured to determine the group information of the plurality of input devices according to the plurality of maximum operating powers and the grid-connected upper limit power.
And the scanning module 30 is used for performing photovoltaic I-V scanning on all the input devices according to the group information.
In some embodiments, the determination module 20 includes:
a first determining unit for determining the operating power class of the plurality of input devices according to the plurality of maximum operating powers.
And the second determining unit is used for determining group information according to the operating power type, the maximum operating powers and the grid-connected upper limit power.
In some embodiments, when the operating power classes are equal to each of the plurality of maximum operating powers, the second determining unit is further configured to: dividing the grid-connected upper limit power by the maximum operation power to obtain the maximum equipment number of each group; the group information is determined based on the maximum number of devices and the number of the plurality of input devices.
In some embodiments, when the operating power class is that the plurality of maximum operating powers are not completely equal, the second determining unit is further configured to: and grouping the plurality of input devices one by one according to the plurality of maximum operating powers and the grid-connected upper limit power to determine group information.
In some embodiments, when the operating power class is that the plurality of maximum operating powers are not completely equal, the second determining unit is further configured to: determining the same maximum operating power in the plurality of maximum operating powers as the same group, and determining the remaining maximum operating power as a different group; in the same group, dividing the grid-connected upper limit power by the maximum operating power of each same group to obtain the maximum equipment number of each same group, and determining first group information according to the maximum equipment number and the number of a plurality of input equipment; in different groups, according to a plurality of maximum operating powers and grid-connected upper limit powers, grouping a plurality of input devices one by one to determine second group information; and obtaining the group information according to the first group information and the second group information.
In some embodiments, the photovoltaic I-V scanning apparatus 300 further comprises:
and the judging module 40 is configured to judge whether at least one of the plurality of maximum operating powers is greater than the grid-connected upper limit power after the plurality of maximum operating powers and the grid-connected upper limit power are obtained. If yes, removing the input equipment with the maximum operating power larger than the grid-connected upper limit power, and then determining the group information according to the remaining maximum operating power and the grid-connected upper limit power.
It should be noted that the photovoltaic I-V scanning apparatus can execute the photovoltaic I-V scanning method provided by the embodiment of the present invention, and has corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in the embodiments of the spatial localization apparatus, reference may be made to the photovoltaic I-V scanning method provided in the embodiments of the present invention.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; within the idea of the invention, also technical features in the above embodiments or in different embodiments may be combined, steps may be implemented in any order, and there are many other variations of the different aspects of the invention as described above, which are not provided in detail for the sake of brevity; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and these modifications or substitutions do not depart from the scope of the technical solutions of the embodiments of the present application.
Claims (5)
1. A photovoltaic I-V scanning method is applied to a photovoltaic system, the photovoltaic system comprises a plurality of input devices and a controller, and the photovoltaic I-V scanning method comprises the following steps:
acquiring a plurality of maximum operating powers and grid-connected upper limit powers;
determining operating power classes of a plurality of input devices according to the maximum operating powers, wherein the operating power classes comprise that the maximum operating powers are all equal and the maximum operating powers are not all equal;
determining group information according to the operating power category, the maximum operating powers and the grid-connected upper limit power;
performing photovoltaic I-V scanning on all the input equipment according to the group information;
when the operating power categories are that the maximum operating powers are equal, determining the category information according to the operating power categories, the maximum operating powers and the grid-connected upper limit power comprises: dividing the grid-connected upper limit power by the maximum operation power to obtain the maximum equipment number of each group; determining the group information according to the maximum equipment number and the number of a plurality of input equipment;
when the operating power category is that the maximum operating powers are not completely equal, the obtaining of the group information according to the operating power category, the maximum operating powers and the grid-connected upper limit power comprises: and grouping the input devices one by one according to the maximum operating powers and the grid-connected upper limit power to determine the group information.
2. The photovoltaic I-V scanning method of claim 1, wherein said grouping the plurality of input devices one by one to determine the group information according to the plurality of maximum operating powers and grid-tied upper limit power comprises:
determining the same maximum operating power in the plurality of maximum operating powers as the same group, and determining the remaining maximum operating power as a different group;
in the same group, dividing the grid-connected upper limit power by the maximum operating power of each same group to obtain the maximum equipment number of each same group, and determining first group information according to the maximum equipment number and the number of a plurality of input equipment;
in the different groups, grouping a plurality of input devices one by one according to the maximum operating powers and the grid-connected upper limit power to determine second group information;
and obtaining the group information according to the first group information and the second group information.
3. The photovoltaic I-V scanning method according to any one of claims 1 or 2, wherein after obtaining the plurality of maximum operating powers and the grid-connected upper limit power, the photovoltaic I-V scanning method further comprises:
judging whether at least one of the maximum operating powers is larger than grid-connected upper limit power;
if yes, removing the input equipment with the maximum operating power larger than the grid-connected upper limit power, and then determining the group information according to the remaining maximum operating power and the grid-connected upper limit power.
4. A photovoltaic I-V scanning apparatus for use in a photovoltaic system, the photovoltaic system including a plurality of input devices and a controller, the photovoltaic I-V scanning apparatus comprising:
the acquisition module is used for acquiring a plurality of maximum operating powers and grid-connected upper limit powers;
a first determining module, configured to determine operating power classes of the plurality of input devices according to the plurality of maximum operating powers, where the operating power classes include that the plurality of maximum operating powers are all equal and that the plurality of maximum operating powers are not all equal;
the second determining module is used for determining group information according to the operating power category, the maximum operating powers and the grid-connected upper limit power;
the scanning module is used for carrying out photovoltaic I-V scanning on all the input equipment according to the group information;
wherein, when the operating power classes are equal to each of the maximum operating powers, the second determining module is further configured to: dividing the grid-connected upper limit power by the maximum operation power to obtain the maximum equipment number of each group; determining the group information according to the maximum equipment number and the number of a plurality of input equipment;
when the operating power class is a plurality of maximum operating powers that are not completely equal, the second determining module is further configured to: and grouping the input devices one by one according to the maximum operating powers and the grid-connected upper limit power to determine the group information.
5. A photovoltaic system comprising a plurality of input devices and a controller, the plurality of input devices each connected to the controller; the controller includes:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein the content of the first and second substances,
the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the photovoltaic I-V scanning method of any one of claims 1 to 3.
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