CN116418048B - Photovoltaic power generation detection method, device, computer equipment and storage medium - Google Patents
Photovoltaic power generation detection method, device, computer equipment and storage medium Download PDFInfo
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- CN116418048B CN116418048B CN202310650693.8A CN202310650693A CN116418048B CN 116418048 B CN116418048 B CN 116418048B CN 202310650693 A CN202310650693 A CN 202310650693A CN 116418048 B CN116418048 B CN 116418048B
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- 238000010248 power generation Methods 0.000 title claims abstract description 34
- 238000001514 detection method Methods 0.000 title claims description 16
- 238000000034 method Methods 0.000 claims abstract description 37
- 238000004590 computer program Methods 0.000 claims description 13
- 238000005516 engineering process Methods 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 3
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 2
- 229910052799 carbon Inorganic materials 0.000 description 2
- 238000010187 selection method Methods 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003610 charcoal Substances 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
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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
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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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
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Photovoltaic Devices (AREA)
Abstract
The present invention relates to the field of photovoltaic power generation technologies, and in particular, to a method and apparatus for detecting photovoltaic power generation, a computer device, and a storage medium. The method comprises the following steps: detecting the direct-current voltage output by the first photovoltaic module to the photovoltaic inverter to obtain a first direct-current voltage; detecting the direct-current voltage output by the second photovoltaic module to the photovoltaic inverter to obtain a second direct-current voltage; comparing the second direct current voltage with the first direct current voltage; and if the second direct current voltage is smaller than the first direct current voltage, sending the first closing instruction. The power of the photovoltaic inverter is selected according to the first photovoltaic module, but not according to the first photovoltaic module and the second photovoltaic module, so that the problem that the cost of the photovoltaic inverter is high because the power of the photovoltaic inverter is selected according to all the photovoltaic modules connected with the photovoltaic inverter by connecting all the photovoltaic modules all the time in the existing photovoltaic power generation scheme is solved.
Description
Technical Field
The present invention relates to the field of photovoltaic power generation technologies, and in particular, to a method and apparatus for detecting photovoltaic power generation, a computer device, and a storage medium.
Background
After going into the 21 st century, our country has been strongly advanced in the development of clean energy based on environmental protection and sustainable development. For historical reasons, carbon emission in China mainly comes from the power industry, and representative of the carbon emission is thermal power generation, and electricity is obtained mainly by burning coal to burn charcoal. In recent years, energy transformation is urgent, and wind power generation and solar photovoltaic power generation gradually go on the stage. Among wind power and photovoltaic power generation, photovoltaic power generation has become the mainstream choice due to its low-input high-return characteristics. In the prior art, the scheme of photovoltaic power generation is to connect all photovoltaic modules with a photovoltaic inverter all the time, and the power of the photovoltaic inverter is selected according to all the photovoltaic modules connected with the photovoltaic inverter, but the cost of the photovoltaic inverter with higher power is higher.
Disclosure of Invention
Aiming at the defects of the prior art, the invention provides a detection method, a device, computer equipment and a storage medium for photovoltaic power generation, and aims to solve the problem that the cost of a photovoltaic inverter is high because all photovoltaic modules are always connected with the photovoltaic inverter in the existing photovoltaic power generation scheme and the power of the photovoltaic inverter is selected according to all the connected photovoltaic modules.
The technical scheme provided by the invention is as follows:
the utility model provides a detection method of photovoltaic power generation, first photovoltaic module, second photovoltaic module are installed with first direction, second direction respectively, first photovoltaic module with second photovoltaic module includes that a plurality of photovoltaic board quantity and specification are the same, first direction with the second direction is two different directions, first photovoltaic module, second photovoltaic module is connected with photovoltaic dc-to-ac converter through first switch, second switch respectively, wherein the power of photovoltaic dc-to-ac converter is according to first photovoltaic module selects, the method includes:
a first closing instruction is sent to the first photovoltaic module at a first signal frequency, and the first closing instruction is used for closing the first switch so that the first photovoltaic module is conducted with the photovoltaic inverter;
detecting the direct-current voltage output by the first photovoltaic module to the photovoltaic inverter to obtain a first direct-current voltage;
transmitting a first disconnection instruction to the first photovoltaic module at the first signal frequency, wherein the first disconnection instruction is used for disconnecting the first switch so that the first photovoltaic module is disconnected from the photovoltaic inverter;
sending a second closing instruction to the second photovoltaic module at the first signal frequency, wherein the second closing instruction is used for closing the second switch so that the second photovoltaic module is conducted with the photovoltaic inverter;
detecting the direct-current voltage output by the second photovoltaic module to the photovoltaic inverter to obtain a second direct-current voltage;
comparing the second direct current voltage with the first direct current voltage;
if the second direct current voltage is smaller than the first direct current voltage, sending a second disconnection instruction to the second photovoltaic module at the first signal frequency, wherein the second disconnection instruction is used for disconnecting the second switch, so that the second photovoltaic module is disconnected from the photovoltaic inverter;
and sending the first closing instruction to the first photovoltaic module at the first signal frequency.
Preferably, after the step of comparing the magnitudes of the second dc voltage and the first dc voltage, the method further comprises:
and if the second direct current voltage is larger than the first direct current voltage, maintaining the current state of the second photovoltaic module.
Preferably, each photovoltaic panel in the first photovoltaic assembly is provided with a first sub-switch, the first sub-switch is used for controlling the on-off of the corresponding photovoltaic panel, the first closing instruction is also used for closing the first sub-switch, and the first opening instruction is also used for opening the first sub-switch;
after the step of sending the first closing instruction to the first photovoltaic module at the first signal frequency, the method comprises:
transmitting a first disconnection instruction to the first photovoltaic module at the first signal frequency;
transmitting a third closing instruction to the first photovoltaic module at a second signal frequency, wherein the third closing instruction is used for closing the first switch and closing the first sub-switch, and the second signal frequency and the first signal frequency are signals with two different frequencies;
detecting the direct-current voltage output by the first photovoltaic module to the photovoltaic inverter to obtain a third direct-current voltage;
comparing the third direct current voltage with the first direct current voltage;
and if the third direct current voltage is smaller than the first direct current voltage, sending the first closing instruction to the first photovoltaic module at the first signal frequency.
Preferably, after the step of comparing the magnitudes of the third dc voltage and the first dc voltage, the method further comprises:
and if the third direct current voltage is greater than or equal to the first direct current voltage, maintaining the current state of the first photovoltaic module.
Preferably, after the step of sending the first closing instruction to the first photovoltaic module at the first signal frequency, the method includes:
judging whether the direct-current voltage output by the first photovoltaic module to the photovoltaic inverter is smaller than a preset voltage threshold value or not;
if yes, a second closing instruction is sent to the second photovoltaic module at the first signal frequency.
Preferably, after the step of comparing the magnitudes of the second dc voltage and the first dc voltage, the method further comprises:
if the second direct current voltage is equal to the first direct current voltage, identifying whether the second direct current voltage is 0;
if not, the current state of the second photovoltaic module is maintained.
Preferably, after the step of identifying whether the second dc voltage is 0, it includes:
if yes, a fault alarm signal is sent out.
The invention also provides a detection device for photovoltaic power generation, the device comprises a first photovoltaic module and a second photovoltaic module which are respectively installed in a first direction and a second direction, the number and the specification of the first photovoltaic module and the second photovoltaic module comprise a plurality of photovoltaic plates are the same, the first direction and the second direction are two different directions, the first photovoltaic module and the second photovoltaic module are respectively connected with a photovoltaic inverter through a first switch and a second switch, wherein the power of the photovoltaic inverter is selected according to the first photovoltaic module, and the device comprises:
the first sending module is used for sending a first closing instruction to the first photovoltaic module at a first signal frequency, and the first closing instruction is used for closing the first switch so that the first photovoltaic module is conducted with the photovoltaic inverter;
the first detection module is used for detecting the direct-current voltage output by the first photovoltaic module to the photovoltaic inverter to obtain a first direct-current voltage;
the second sending module is used for sending a first disconnection instruction to the first photovoltaic module at the first signal frequency, wherein the first disconnection instruction is used for disconnecting the first switch so that the first photovoltaic module is disconnected from the photovoltaic inverter;
the third sending module is used for sending a second closing instruction to the second photovoltaic module at the first signal frequency, and the second closing instruction is used for closing the second switch so that the second photovoltaic module is conducted with the photovoltaic inverter;
the first detection module is used for detecting the direct-current voltage output by the second photovoltaic module to the photovoltaic inverter to obtain a second direct-current voltage;
the comparison module is used for comparing the second direct-current voltage with the first direct-current voltage;
the fourth sending module is configured to send a second disconnection instruction to the second photovoltaic module at the first signal frequency if the second dc voltage is smaller than the first dc voltage, where the second disconnection instruction is used to disconnect the second switch, so that the second photovoltaic module is disconnected from the photovoltaic inverter;
and the fifth sending module is used for sending the first closing instruction to the first photovoltaic module at the first signal frequency.
The invention also provides a computer device comprising a memory storing a computer program and a processor implementing the steps of any of the methods described above when the processor executes the computer program.
The invention also provides a computer readable storage medium having stored thereon a computer program which when executed by a processor performs the steps of the method of any of the preceding claims.
According to the technical scheme, the invention has the beneficial effects that: the power of the photovoltaic inverter is selected according to the first photovoltaic module, but not according to the first photovoltaic module and the second photovoltaic module, and the photovoltaic inverter is also selected to be conducted according to the direct-current voltage output by the first photovoltaic module and the second photovoltaic module, so that the problem that the cost of the photovoltaic inverter is high due to the fact that all photovoltaic modules are always connected with the photovoltaic inverter in the existing photovoltaic power generation scheme is solved.
Drawings
Fig. 1 is a flowchart of a method for detecting photovoltaic power generation provided by an embodiment of the present invention;
FIG. 2 is a functional block diagram of a photovoltaic power generation detection apparatus according to an embodiment of the present invention;
fig. 3 is a schematic block diagram of a computer device to which an embodiment of the present invention is applied.
Detailed Description
The present invention will be described in further detail with reference to the drawings and examples, in order to make the objects, technical solutions and advantages of the present invention more apparent. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the invention.
As shown in fig. 1, an embodiment of the present invention provides a method for detecting photovoltaic power generation, in which a first photovoltaic module and a second photovoltaic module are installed in a first direction and a second direction, the number and specifications of the first photovoltaic module and the second photovoltaic module include a plurality of photovoltaic panels are the same, the first direction and the second direction are two different directions, the first photovoltaic module and the second photovoltaic module are connected with a photovoltaic inverter through a first switch and a second switch, respectively, wherein the power of the photovoltaic inverter is selected according to the first photovoltaic module, and the method includes:
step S101, a first closing instruction is sent to the first photovoltaic module at a first signal frequency, wherein the first closing instruction is used for closing the first switch so that the first photovoltaic module is conducted with the photovoltaic inverter.
The first photovoltaic module comprises a plurality of first photovoltaic plates, the second photovoltaic module comprises a plurality of second photovoltaic plates, the number of the first photovoltaic plates is the same as that of the second photovoltaic plates, and the specifications of the first photovoltaic plates are the same as those of the second photovoltaic plates, namely the first photovoltaic plates are the same as those of the second photovoltaic plates.
In this embodiment, the first direction is a direction in which the first photovoltaic module is perpendicular to the solar ray of the sun at 11 points, and the first direction is perpendicular to the second direction.
The power of the photovoltaic inverter is selected according to the first photovoltaic module, and the selection method is that an existing matching method of the photovoltaic inverter and the photovoltaic module is adopted, and in this embodiment, the power of the photovoltaic inverter is selected according to the first photovoltaic module, but not all the photovoltaic modules, that is, not the sum of the first photovoltaic module and the second photovoltaic module.
Step S102, detecting the direct-current voltage output by the first photovoltaic module to the photovoltaic inverter to obtain a first direct-current voltage.
The first switch is closed by the first closing instruction, the first photovoltaic module is conducted with the photovoltaic inverter, in addition, the second photovoltaic module is disconnected with the photovoltaic inverter, at the moment, the direct current voltage input to the photovoltaic inverter is the first photovoltaic module, the voltage of the input end of the photovoltaic inverter is detected, and the first direct current voltage can be obtained.
Step S103, a first disconnection instruction is sent to the first photovoltaic module at the first signal frequency, where the first disconnection instruction is used to disconnect the first switch, so that the first photovoltaic module is disconnected from the photovoltaic inverter.
After the first direct current voltage is obtained, a first disconnection instruction is sent to the first photovoltaic module at the same signal frequency, namely the first signal frequency, the first switch is disconnected, and the first photovoltaic module is disconnected from the photovoltaic inverter.
Step S104, a second closing instruction is sent to the second photovoltaic module at the first signal frequency, and the second closing instruction is used for closing the second switch so that the second photovoltaic module is conducted with the photovoltaic inverter.
After the first switch is opened, a second closing instruction is sent to the second photovoltaic module at the same signal frequency, namely the first signal frequency, and the second photovoltaic module is conducted with the photovoltaic inverter through closing of the second switch.
Step S105, detecting a dc voltage output by the second photovoltaic module to the photovoltaic inverter, to obtain a second dc voltage.
The second switch is closed by the second closing instruction, the second photovoltaic module is conducted with the photovoltaic inverter, in addition, the first photovoltaic module is disconnected with the photovoltaic inverter, at the moment, the direct current voltage input to the photovoltaic inverter is the second photovoltaic module, the voltage of the input end of the photovoltaic inverter is detected, and the second direct current voltage can be obtained.
Step S106, comparing the second direct current voltage with the first direct current voltage.
And comparing the second direct current voltage with the first direct current voltage by a difference value method to obtain a comparison result, wherein the comparison result has three conditions which are equal to, smaller than or larger than each other.
Step S107, if the second dc voltage is smaller than the first dc voltage, sending a second disconnection instruction to the second photovoltaic module at the first signal frequency, where the second disconnection instruction is used to disconnect the second switch, so that the second photovoltaic module is disconnected from the photovoltaic inverter.
When the second direct-current voltage is smaller than the first direct-current voltage, the second switch is disconnected by sending a second disconnection instruction to the second photovoltaic module at the same signal frequency as the first signal frequency.
Step S108, the first closing instruction is sent to the first photovoltaic module at the first signal frequency.
And after the second switch is opened, the first closing instruction is sent to the first photovoltaic module again at the first signal frequency.
The power of the photovoltaic inverter is selected according to the first photovoltaic module, but not according to the first photovoltaic module and the second photovoltaic module, and the photovoltaic inverter is also selected to be conducted according to the direct-current voltage output by the first photovoltaic module and the second photovoltaic module, so that the problem that the cost of the photovoltaic inverter is high due to the fact that all photovoltaic modules are always connected with the photovoltaic inverter in the existing photovoltaic power generation scheme is solved.
In the present embodiment, after step S106, it includes:
and if the second direct current voltage is larger than the first direct current voltage, maintaining the current state of the second photovoltaic module.
And when the second direct-current voltage is larger than the first direct-current voltage, the conduction between the second photovoltaic module and the photovoltaic inverter is kept.
In this embodiment, each photovoltaic panel in the first photovoltaic module is provided with a first sub-switch, the first sub-switch is used for controlling on-off of a corresponding photovoltaic panel, the first closing instruction is further used for closing the first sub-switch, and the first opening instruction is further used for opening the first sub-switch.
After step S108, it includes:
transmitting a first disconnection instruction to the first photovoltaic module at the first signal frequency;
transmitting a third closing instruction to the first photovoltaic module at a second signal frequency, wherein the third closing instruction is used for closing the first switch and closing the first sub-switch, and the second signal frequency and the first signal frequency are signals with two different frequencies;
detecting the direct-current voltage output by the first photovoltaic module to the photovoltaic inverter to obtain a third direct-current voltage;
comparing the third direct current voltage with the first direct current voltage;
and if the third direct current voltage is smaller than the first direct current voltage, sending the first closing instruction to the first photovoltaic module at the first signal frequency.
Signal interference may exist, in order to close the more first sub-switch, a third closing instruction is sent to the first photovoltaic module at the second signal frequency, then the direct current voltage input by the photovoltaic inverter at the moment is detected to obtain a third direct current voltage, the third direct current voltage is compared with the first direct current voltage, and the closing instruction is sent according to the comparison result to determine which signal frequency.
In this embodiment, after the step of comparing the magnitudes of the third dc voltage and the first dc voltage, the method includes:
and if the third direct current voltage is greater than or equal to the first direct current voltage, maintaining the current state of the first photovoltaic module.
If the third dc voltage is greater than or equal to the first dc voltage, it is stated that the number of first sub-switches to be closed at the second signal frequency will be greater than the number of first sub-switches to be closed at the second signal frequency or the number of first sub-switches to be closed at the second signal frequency will be the same as the number of first sub-switches.
In this embodiment, after the step of sending the first closing instruction to the first photovoltaic module at the first signal frequency, the method includes:
judging whether the direct-current voltage output by the first photovoltaic module to the photovoltaic inverter is smaller than a preset voltage threshold value or not;
if yes, a second closing instruction is sent to the second photovoltaic module at the first signal frequency.
When the direct current voltage input by the photovoltaic inverter is smaller than a preset voltage threshold value, the position of solar rays is changed greatly, and the object which is conducted with the photovoltaic inverter needs to be switched.
In the present embodiment, after step S106, it includes:
if the second direct current voltage is equal to the first direct current voltage, identifying whether the second direct current voltage is 0;
if not, the current state of the second photovoltaic module is maintained.
When the second dc voltage is equal to the first dc voltage, it is necessary to avoid a situation that the first switch is not closed by the first closing command and the second switch is not closed by the second closing command, by identifying whether the second dc voltage is 0.
In this embodiment, after the step of identifying whether the second dc voltage is 0, the method includes:
if yes, a fault alarm signal is sent out.
In this embodiment, if the second dc voltage is identified as 0, the first switch of the first photovoltaic module and the second switch of the second photovoltaic module are in a fault that cannot be closed, and then a fault alarm signal needs to be sent to the user.
As shown in fig. 2, an embodiment of the present invention provides a detection device 1 for photovoltaic power generation, where the device includes a first photovoltaic module and a second photovoltaic module that are installed in a first direction and a second direction, the number and specifications of the first photovoltaic module and the second photovoltaic module include a plurality of photovoltaic panels are the same, the first direction and the second direction are two different directions, the first photovoltaic module and the second photovoltaic module are connected to a photovoltaic inverter through a first switch and a second switch, respectively, where the power of the photovoltaic inverter is selected according to the first photovoltaic module, and the device 1 includes a first sending module 11, a first detecting module 12, a second sending module 13, a third sending module 14, a first detecting module 15, a comparing module 16, a fourth sending module 17, and a fifth sending module 18.
The first sending module 11 is configured to send a first closing instruction to the first photovoltaic module at a first signal frequency, where the first closing instruction is configured to close the first switch, so that the first photovoltaic module is turned on with the photovoltaic inverter.
The first photovoltaic module comprises a plurality of first photovoltaic plates, the second photovoltaic module comprises a plurality of second photovoltaic plates, the number of the first photovoltaic plates is the same as that of the second photovoltaic plates, and the specifications of the first photovoltaic plates are the same as those of the second photovoltaic plates, namely the first photovoltaic plates are the same as those of the second photovoltaic plates.
In this embodiment, the first direction is a direction in which the first photovoltaic module is perpendicular to the solar ray of the sun at 11 points, and the first direction is perpendicular to the second direction.
The power of the photovoltaic inverter is selected according to the first photovoltaic module, and the selection method is that an existing matching method of the photovoltaic inverter and the photovoltaic module is adopted, and in this embodiment, the power of the photovoltaic inverter is selected according to the first photovoltaic module, but not all the photovoltaic modules, that is, not the sum of the first photovoltaic module and the second photovoltaic module.
The first detection module 12 is configured to detect a dc voltage output by the first photovoltaic module to the photovoltaic inverter, so as to obtain a first dc voltage.
The first switch is closed by the first closing instruction, the first photovoltaic module is conducted with the photovoltaic inverter, in addition, the second photovoltaic module is disconnected with the photovoltaic inverter, at the moment, the direct current voltage input to the photovoltaic inverter is the first photovoltaic module, the voltage of the input end of the photovoltaic inverter is detected, and the first direct current voltage can be obtained.
The second sending module 13 is configured to send a first disconnection instruction to the first photovoltaic module at the first signal frequency, where the first disconnection instruction is used to disconnect the first switch, so that the first photovoltaic module is disconnected from the photovoltaic inverter.
After the first direct current voltage is obtained, a first disconnection instruction is sent to the first photovoltaic module at the same signal frequency, namely the first signal frequency, the first switch is disconnected, and the first photovoltaic module is disconnected from the photovoltaic inverter.
And a third sending module 14, configured to send a second closing instruction to the second photovoltaic module at the first signal frequency, where the second closing instruction is used to close the second switch, so that the second photovoltaic module is turned on with the photovoltaic inverter.
After the first switch is opened, a second closing instruction is sent to the second photovoltaic module at the same signal frequency, namely the first signal frequency, and the second photovoltaic module is conducted with the photovoltaic inverter through closing of the second switch.
The first detection module 15 is configured to detect a dc voltage output by the second photovoltaic module to the photovoltaic inverter, so as to obtain a second dc voltage.
The second switch is closed by the second closing instruction, the second photovoltaic module is conducted with the photovoltaic inverter, in addition, the first photovoltaic module is disconnected with the photovoltaic inverter, at the moment, the direct current voltage input to the photovoltaic inverter is the second photovoltaic module, the voltage of the input end of the photovoltaic inverter is detected, and the second direct current voltage can be obtained.
The comparing module 16 is configured to compare the second dc voltage with the first dc voltage.
And comparing the second direct current voltage with the first direct current voltage by a difference value method to obtain a comparison result, wherein the comparison result has three conditions which are equal to, smaller than or larger than each other.
And a fourth sending module 17, configured to send a second disconnection instruction to the second photovoltaic module at the first signal frequency if the second dc voltage is less than the first dc voltage, where the second disconnection instruction is used to disconnect the second switch, so that the second photovoltaic module is disconnected from the photovoltaic inverter.
When the second direct-current voltage is smaller than the first direct-current voltage, the second switch is disconnected by sending a second disconnection instruction to the second photovoltaic module at the same signal frequency as the first signal frequency.
A fifth sending module 18 is configured to send the first closing instruction to the first photovoltaic module at the first signal frequency.
And after the second switch is opened, the first closing instruction is sent to the first photovoltaic module again at the first signal frequency.
The power of the photovoltaic inverter is selected according to the first photovoltaic module, but not according to the first photovoltaic module and the second photovoltaic module, and the photovoltaic inverter is also selected to be conducted according to the direct-current voltage output by the first photovoltaic module and the second photovoltaic module, so that the problem that the cost of the photovoltaic inverter is high due to the fact that all photovoltaic modules are always connected with the photovoltaic inverter in the existing photovoltaic power generation scheme is solved.
In this embodiment, the apparatus 1 includes:
and the first sub-holding module is used for holding the current state of the second photovoltaic module if the second direct current voltage is larger than the first direct current voltage.
And when the second direct-current voltage is larger than the first direct-current voltage, the conduction between the second photovoltaic module and the photovoltaic inverter is kept.
In this embodiment, each photovoltaic panel in the first photovoltaic module is provided with a first sub-switch, the first sub-switch is used for controlling on-off of a corresponding photovoltaic panel, the first closing instruction is further used for closing the first sub-switch, and the first opening instruction is further used for opening the first sub-switch.
The apparatus 1 comprises:
the first sub-sending module is used for sending a first disconnection instruction to the first photovoltaic module at the first signal frequency;
the second sub-sending module is used for sending a third closing instruction to the first photovoltaic module at a second signal frequency, wherein the third closing instruction is used for closing the first switch and closing the first sub-switch, and the second signal frequency and the first signal frequency are signals with two different frequencies;
the first sub-detection module is used for detecting the direct-current voltage output by the first photovoltaic module to the photovoltaic inverter to obtain a third direct-current voltage;
the first sub-comparison module is used for comparing the third direct-current voltage with the first direct-current voltage;
and the third sub-sending module is used for sending the first closing instruction to the first photovoltaic module at the first signal frequency if the third direct-current voltage is smaller than the first direct-current voltage.
Signal interference may exist, in order to close the more first sub-switch, a third closing instruction is sent to the first photovoltaic module at the second signal frequency, then the direct current voltage input by the photovoltaic inverter at the moment is detected to obtain a third direct current voltage, the third direct current voltage is compared with the first direct current voltage, and the closing instruction is sent according to the comparison result to determine which signal frequency.
In this embodiment, the apparatus 1 includes:
and the second sub-holding module is used for holding the current state of the first photovoltaic module if the third direct current voltage is greater than or equal to the first direct current voltage.
If the third dc voltage is greater than or equal to the first dc voltage, it is stated that the number of first sub-switches to be closed at the second signal frequency will be greater than the number of first sub-switches to be closed at the second signal frequency or the number of first sub-switches to be closed at the second signal frequency will be the same as the number of first sub-switches.
In this embodiment, the apparatus 1 includes:
the first sub-judging module is used for judging whether the direct-current voltage output by the first photovoltaic module to the photovoltaic inverter is smaller than a preset voltage threshold value or not;
and the fourth sub-sending module is used for sending a second closing instruction to the second photovoltaic module at the first signal frequency if the second closing instruction is sent.
When the direct current voltage input by the photovoltaic inverter is smaller than a preset voltage threshold value, the position of solar rays is changed greatly, and the object which is conducted with the photovoltaic inverter needs to be switched.
In this embodiment, the apparatus 1 includes:
the first sub-identification module is used for identifying whether the second direct-current voltage is 0 or not if the second direct-current voltage is equal to the first direct-current voltage;
and the third sub-holding module is used for holding the current state of the second photovoltaic module if not.
When the second dc voltage is equal to the first dc voltage, it is necessary to avoid a situation that the first switch is not closed by the first closing command and the second switch is not closed by the second closing command, by identifying whether the second dc voltage is 0.
In this embodiment, the apparatus 1 includes:
and the first sub-alarm module is used for sending out a fault alarm signal if the second direct-current voltage is identified to be 0.
In this embodiment, if the second dc voltage is identified as 0, the first switch of the first photovoltaic module and the second switch of the second photovoltaic module are in a fault that cannot be closed, and then a fault alarm signal needs to be sent to the user.
As shown in fig. 3, in an embodiment of the present invention, a computer device is further provided, where the computer device may be a server, and the internal structure of the computer device may be as shown in fig. 3. The computer device includes a processor, a memory, a network interface, and a database connected by a system bus. Wherein the computer is configured to provide computing and control capabilities. The memory of the computer device includes a non-volatile storage medium and an internal memory. The non-volatile storage medium stores an operating system, computer programs, and a database. The memory provides an environment for the operation of the operating system and computer programs in the non-volatile storage media. The database of the computer equipment is used for storing data such as models of the detection method of photovoltaic power generation. The network interface of the computer device is used for communicating with an external terminal through a network connection. The computer program, when executed by a processor, implements a method of detecting photovoltaic power generation.
The processor executes the steps of the method for detecting photovoltaic power generation: a first closing instruction is sent to the first photovoltaic module at a first signal frequency, and the first closing instruction is used for closing the first switch so that the first photovoltaic module is conducted with the photovoltaic inverter;
detecting the direct-current voltage output by the first photovoltaic module to the photovoltaic inverter to obtain a first direct-current voltage;
transmitting a first disconnection instruction to the first photovoltaic module at the first signal frequency, wherein the first disconnection instruction is used for disconnecting the first switch so that the first photovoltaic module is disconnected from the photovoltaic inverter;
sending a second closing instruction to the second photovoltaic module at the first signal frequency, wherein the second closing instruction is used for closing the second switch so that the second photovoltaic module is conducted with the photovoltaic inverter;
detecting the direct-current voltage output by the second photovoltaic module to the photovoltaic inverter to obtain a second direct-current voltage;
comparing the second direct current voltage with the first direct current voltage;
if the second direct current voltage is smaller than the first direct current voltage, sending a second disconnection instruction to the second photovoltaic module at the first signal frequency, wherein the second disconnection instruction is used for disconnecting the second switch, so that the second photovoltaic module is disconnected from the photovoltaic inverter;
and sending the first closing instruction to the first photovoltaic module at the first signal frequency.
It will be appreciated by those skilled in the art that the architecture shown in fig. 3 is merely a block diagram of a portion of the architecture in connection with the present inventive arrangements and is not intended to limit the computer devices to which the present inventive arrangements are applicable.
According to the computer equipment provided by the embodiment of the invention, the power of the photovoltaic inverter is selected according to the first photovoltaic module instead of the first photovoltaic module and the second photovoltaic module, and the photovoltaic inverter is also selected to be conducted according to the direct-current voltage output by the first photovoltaic module and the second photovoltaic module, so that the problem that the cost of the photovoltaic inverter is high due to the fact that all photovoltaic modules are always connected with the photovoltaic inverter in the existing photovoltaic power generation scheme is solved.
An embodiment of the present invention further provides a computer readable storage medium having a computer program stored thereon, where the computer program when executed by a processor implements a method for detecting photovoltaic power generation, specifically: a first closing instruction is sent to the first photovoltaic module at a first signal frequency, and the first closing instruction is used for closing the first switch so that the first photovoltaic module is conducted with the photovoltaic inverter;
detecting the direct-current voltage output by the first photovoltaic module to the photovoltaic inverter to obtain a first direct-current voltage;
transmitting a first disconnection instruction to the first photovoltaic module at the first signal frequency, wherein the first disconnection instruction is used for disconnecting the first switch so that the first photovoltaic module is disconnected from the photovoltaic inverter;
sending a second closing instruction to the second photovoltaic module at the first signal frequency, wherein the second closing instruction is used for closing the second switch so that the second photovoltaic module is conducted with the photovoltaic inverter;
detecting the direct-current voltage output by the second photovoltaic module to the photovoltaic inverter to obtain a second direct-current voltage;
comparing the second direct current voltage with the first direct current voltage;
if the second direct current voltage is smaller than the first direct current voltage, sending a second disconnection instruction to the second photovoltaic module at the first signal frequency, wherein the second disconnection instruction is used for disconnecting the second switch, so that the second photovoltaic module is disconnected from the photovoltaic inverter;
and sending the first closing instruction to the first photovoltaic module at the first signal frequency.
According to the storage medium, the power of the photovoltaic inverter is selected according to the first photovoltaic module, but not according to the first photovoltaic module and the second photovoltaic module, and the photovoltaic inverter is also selected to be conducted according to the direct current voltage output by the first photovoltaic module and the second photovoltaic module, so that the problem that the cost of the photovoltaic inverter is high due to the fact that all photovoltaic modules are always connected with the photovoltaic inverter in the existing photovoltaic power generation scheme is solved.
Those skilled in the art will appreciate that implementing all or part of the above described methods may be accomplished by way of a computer program stored on a non-transitory computer readable storage medium, which when executed, may comprise the steps of the embodiments of the methods described above. Any reference to memory, storage, database, or other medium provided by the present invention and used in embodiments may include non-volatile and/or volatile memory. The nonvolatile memory can include Read Only Memory (ROM), programmable ROM (PROM), electrically Programmable ROM (EPROM), electrically Erasable Programmable ROM (EEPROM), or flash memory. Volatile memory can include Random Access Memory (RAM) or external cache memory. By way of illustration and not limitation, RAM is available in a variety of forms such as Static RAM (SRAM), dynamic RAM (DRAM), synchronous DRAM (SDRAM), dual speed data rate SDRAM (SSRSDRAM), enhanced SDRAM (ESDRAM), synchronous Link DRAM (SLDRAM), memory bus direct RAM (RDRAM), direct memory bus dynamic RAM (DRDRAM), and memory bus dynamic RAM (RDRAM), among others.
The foregoing description of the preferred embodiment of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, and alternatives falling within the spirit and principles of the invention.
Claims (10)
1. The method for detecting photovoltaic power generation is characterized in that a first photovoltaic module and a second photovoltaic module are respectively installed in a first direction and a second direction, the number and the specification of the first photovoltaic module and the second photovoltaic module comprise a plurality of photovoltaic plates are the same, the first direction and the second direction are two different directions, the first photovoltaic module and the second photovoltaic module are respectively connected with a photovoltaic inverter through a first switch and a second switch, and the power of the photovoltaic inverter is selected according to the first photovoltaic module, and the method comprises the following steps:
a first closing instruction is sent to the first photovoltaic module at a first signal frequency, and the first closing instruction is used for closing the first switch so that the first photovoltaic module is conducted with the photovoltaic inverter;
detecting the direct-current voltage output by the first photovoltaic module to the photovoltaic inverter to obtain a first direct-current voltage;
transmitting a first disconnection instruction to the first photovoltaic module at the first signal frequency, wherein the first disconnection instruction is used for disconnecting the first switch so that the first photovoltaic module is disconnected from the photovoltaic inverter;
sending a second closing instruction to the second photovoltaic module at the first signal frequency, wherein the second closing instruction is used for closing the second switch so that the second photovoltaic module is conducted with the photovoltaic inverter;
detecting the direct-current voltage output by the second photovoltaic module to the photovoltaic inverter to obtain a second direct-current voltage;
comparing the second direct current voltage with the first direct current voltage;
if the second direct current voltage is smaller than the first direct current voltage, sending a second disconnection instruction to the second photovoltaic module at the first signal frequency, wherein the second disconnection instruction is used for disconnecting the second switch, so that the second photovoltaic module is disconnected from the photovoltaic inverter;
and sending the first closing instruction to the first photovoltaic module at the first signal frequency.
2. The method according to claim 1, characterized by comprising, after the step of comparing the magnitudes of the second direct-current voltage and the first direct-current voltage:
and if the second direct current voltage is larger than the first direct current voltage, maintaining the current state of the second photovoltaic module.
3. The method for detecting photovoltaic power generation according to claim 1, wherein each photovoltaic panel in the first photovoltaic module is provided with a first sub-switch, the first sub-switch is used for controlling on-off of the corresponding photovoltaic panel, the first closing instruction is further used for closing the first sub-switch, and the first opening instruction is further used for opening the first sub-switch;
after the step of sending the first closing instruction to the first photovoltaic module at the first signal frequency, the method comprises:
transmitting a first disconnection instruction to the first photovoltaic module at the first signal frequency;
transmitting a third closing instruction to the first photovoltaic module at a second signal frequency, wherein the third closing instruction is used for closing the first switch and closing the first sub-switch, and the second signal frequency and the first signal frequency are signals with two different frequencies;
detecting the direct-current voltage output by the first photovoltaic module to the photovoltaic inverter to obtain a third direct-current voltage;
comparing the third direct current voltage with the first direct current voltage;
and if the third direct current voltage is smaller than the first direct current voltage, sending the first closing instruction to the first photovoltaic module at the first signal frequency.
4. A method of detecting photovoltaic power generation according to claim 3, characterized in that after the step of comparing the magnitudes of the third and first direct voltages, it comprises:
and if the third direct current voltage is greater than or equal to the first direct current voltage, maintaining the current state of the first photovoltaic module.
5. The method of claim 1, wherein after the step of sending the first closing instruction to the first photovoltaic module at the first signal frequency, comprising:
judging whether the direct-current voltage output by the first photovoltaic module to the photovoltaic inverter is smaller than a preset voltage threshold value or not;
if yes, a second closing instruction is sent to the second photovoltaic module at the first signal frequency.
6. The method according to claim 1, characterized by comprising, after the step of comparing the magnitudes of the second direct-current voltage and the first direct-current voltage:
if the second direct current voltage is equal to the first direct current voltage, identifying whether the second direct current voltage is 0;
if not, the current state of the second photovoltaic module is maintained.
7. The method according to claim 6, characterized by comprising, after the step of identifying whether the second direct current voltage is 0:
if yes, a fault alarm signal is sent out.
8. The utility model provides a detection device of photovoltaic power generation, its characterized in that, the device includes first photovoltaic module, the second photovoltaic module of installing with first direction, second direction respectively, first photovoltaic module with the second photovoltaic module includes that a plurality of photovoltaic boards's quantity and specification are the same, first direction with the second direction is two different directions, first photovoltaic module the second photovoltaic module is connected with photovoltaic inverter through first switch, second switch respectively, wherein the power of photovoltaic inverter is according to first photovoltaic module selects, the device includes:
the first sending module is used for sending a first closing instruction to the first photovoltaic module at a first signal frequency, and the first closing instruction is used for closing the first switch so that the first photovoltaic module is conducted with the photovoltaic inverter;
the first detection module is used for detecting the direct-current voltage output by the first photovoltaic module to the photovoltaic inverter to obtain a first direct-current voltage;
the second sending module is used for sending a first disconnection instruction to the first photovoltaic module at the first signal frequency, wherein the first disconnection instruction is used for disconnecting the first switch so that the first photovoltaic module is disconnected from the photovoltaic inverter;
the third sending module is used for sending a second closing instruction to the second photovoltaic module at the first signal frequency, and the second closing instruction is used for closing the second switch so that the second photovoltaic module is conducted with the photovoltaic inverter;
the first detection module is used for detecting the direct-current voltage output by the second photovoltaic module to the photovoltaic inverter to obtain a second direct-current voltage;
the comparison module is used for comparing the second direct-current voltage with the first direct-current voltage;
the fourth sending module is configured to send a second disconnection instruction to the second photovoltaic module at the first signal frequency if the second dc voltage is smaller than the first dc voltage, where the second disconnection instruction is used to disconnect the second switch, so that the second photovoltaic module is disconnected from the photovoltaic inverter;
and the fifth sending module is used for sending the first closing instruction to the first photovoltaic module at the first signal frequency.
9. A computer device comprising a memory and a processor, the memory storing a computer program, characterized in that the processor implements the steps of the method of any of claims 1 to 7 when the computer program is executed.
10. A computer readable storage medium, on which a computer program is stored, characterized in that the computer program, when being executed by a processor, implements the steps of the method of any of claims 1 to 7.
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| CN106981881A (en) * | 2016-01-18 | 2017-07-25 | 台达电子企业管理（上海）有限公司 | A kind of photovoltaic generating system and its rapidly switch off method |
| CN108054770B (en) * | 2017-12-31 | 2019-04-23 | 北京金风科创风电设备有限公司 | Photovoltaic power plant and primary frequency modulation control method thereof |
| CN111585307A (en) * | 2020-06-15 | 2020-08-25 | 阳光电源股份有限公司 | Starting method, application device and system of photovoltaic rapid turn-off system |
| CN115189392A (en) * | 2021-04-07 | 2022-10-14 | 华为数字能源技术有限公司 | Control method of photovoltaic module and photovoltaic system |
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| CN102457210A (en) * | 2010-10-20 | 2012-05-16 | 深圳市盛弘电气有限公司 | Method for tracking maximum power point of solar photovoltaic inverter |
| CN106300433A (en) * | 2016-11-10 | 2017-01-04 | 阳光电源股份有限公司 | The control method for coordinating of a kind of photovoltaic optimizer and photovoltaic DC-to-AC converter and device |
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