CN117914255A - Fault determination method and device, storage medium and photovoltaic equipment - Google Patents

Fault determination method and device, storage medium and photovoltaic equipment Download PDF

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Publication number
CN117914255A
CN117914255A CN202311683685.XA CN202311683685A CN117914255A CN 117914255 A CN117914255 A CN 117914255A CN 202311683685 A CN202311683685 A CN 202311683685A CN 117914255 A CN117914255 A CN 117914255A
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China
Prior art keywords
photovoltaic
photovoltaic module
determining
voltage
power
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CN202311683685.XA
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Chinese (zh)
Inventor
郭磊
罗禹
朱孟喆
王梅建
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Guangxi Longyuan New Energy Co ltd
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Guangxi Longyuan New Energy Co ltd
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Priority to CN202311683685.XA priority Critical patent/CN117914255A/en
Publication of CN117914255A publication Critical patent/CN117914255A/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy
    • Y02E10/56Power conversion systems, e.g. maximum power point trackers

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Abstract

The disclosure relates to a fault determination method, a device, a storage medium and photovoltaic equipment, relates to the technical field of photovoltaic equipment, and is applied to the photovoltaic equipment, wherein the photovoltaic equipment comprises a plurality of photovoltaic modules and a plurality of power optimizers, the photovoltaic modules are connected with the power optimizers, and the method comprises the following steps: obtaining the output voltage and the output current of each power optimizer; determining voltage data and current data corresponding to each photovoltaic module according to the plurality of output voltages and the plurality of output currents; and determining whether the photovoltaic module fails according to the voltage data and the current data. The voltage data and the current data of each photovoltaic module are detected through the power optimizer, and whether the photovoltaic module has faults or not is further determined according to the voltage data and the current data of the photovoltaic modules. Therefore, the effect of rapidly positioning the fault photovoltaic module is achieved, the time and cost required by operation and maintenance are reduced, and the operation and maintenance management capability is improved.

Description

Fault determination method and device, storage medium and photovoltaic equipment
Technical Field
The disclosure relates to the technical field of photovoltaic equipment, and in particular relates to a fault determination method, a device, a storage medium and photovoltaic equipment.
Background
As the installed proportion of renewable energy devices (e.g., photovoltaic devices) continues to increase, the instability of the grid increases and the incidence of grid faults increases. In the future, under the condition that the permeability of new energy is continuously improved, the possibility of power grid faults is synchronously improved.
At present, because the power station is numerous, extensive management can't know the power station operation condition, and the power station breaks down and can't pinpoint, needs expert to carry professional instrument diagnosis of standing on one's stop, and the operation maintenance cost is high, and operation maintenance efficiency is lower simultaneously.
Disclosure of Invention
In order to solve the technical problems, the disclosure provides a fault determining method, a device, a storage medium and photovoltaic equipment.
In a first aspect, the present disclosure provides a method for determining a fault, applied to a photovoltaic device, where the photovoltaic device includes a plurality of photovoltaic modules and a plurality of power optimizers, and the photovoltaic modules are connected to the power optimizers, the method includes: obtaining the output voltage and the output current of each power optimizer; determining voltage data and current data corresponding to each photovoltaic module according to the output voltages and the output currents; and determining whether the photovoltaic module fails according to the voltage data and the current data.
Optionally, the determining whether the photovoltaic module fails according to the voltage data and the current data includes: determining that the photovoltaic module fails under the condition that the voltage data is in a preset voltage range and/or the current data is in a preset current range; or under the condition that the voltage data is out of the preset voltage range and the current data is out of the preset current range, determining that the photovoltaic module is not failed.
Optionally, the determining whether the photovoltaic module fails according to the voltage data and the current data includes: determining target power of each photovoltaic module according to the voltage data and the current data corresponding to the photovoltaic module; and determining whether the photovoltaic module fails according to the target powers.
Optionally, the determining whether the photovoltaic module fails according to the target powers includes: determining the average value of a plurality of target powers to obtain average power; and determining whether the photovoltaic module fails according to the target power and the average power.
Optionally, the method further comprises: and under the condition that the photovoltaic module is determined to be faulty, disconnecting the photovoltaic module from other photovoltaic modules in the photovoltaic equipment through the power optimizer.
Optionally, in the case of determining that the photovoltaic module fails, the method further comprises: acquiring a preset fault corresponding relation, wherein the fault corresponding relation comprises a corresponding relation among a fault type, a voltage range and a current range; and determining the fault type corresponding to the photovoltaic module according to the fault corresponding relation, the voltage data and the current data.
Optionally, the method further comprises: and under the condition that the photovoltaic module is determined to be faulty, generating alarm prompt information, wherein the alarm prompt information is used for prompting the photovoltaic module to be faulty.
In a second aspect, the present disclosure provides a fault determination apparatus applied to a photovoltaic device, the photovoltaic device including a plurality of photovoltaic modules and a plurality of power optimizers, the photovoltaic modules being connected to the power optimizers, the apparatus comprising:
The acquisition module is used for acquiring the output voltage and the output current of each power optimizer;
The first determining module is used for determining voltage data and current data corresponding to each photovoltaic module according to the output voltages and the output currents;
and the second determining module is used for determining whether the photovoltaic module fails according to the voltage data and the current data.
Optionally, the second determining module is configured to determine that the photovoltaic module fails when the voltage data is within a preset voltage range and/or the current data is within a preset current range; or under the condition that the voltage data is out of the preset voltage range and the current data is out of the preset current range, determining that the photovoltaic module is not failed.
Optionally, the second determining module is configured to determine, for each of the photovoltaic modules, a target power of the photovoltaic module according to the voltage data and the current data corresponding to the photovoltaic module; and determining whether the photovoltaic module fails according to the target powers.
Optionally, the second determining module is configured to determine an average value of the plurality of target powers, to obtain an average power; and determining whether the photovoltaic module fails according to the target power and the average power.
Optionally, the apparatus further comprises:
and the disconnection module is used for disconnecting the photovoltaic module from other photovoltaic modules in the photovoltaic equipment through the power optimizer under the condition that the photovoltaic module is determined to be faulty.
Optionally, under the condition that the photovoltaic module is determined to be faulty, the acquiring module is further configured to acquire a preset fault corresponding relationship, where the fault corresponding relationship includes a corresponding relationship among a fault type, a voltage range and a current range;
the second determining module is further configured to determine a fault type corresponding to the photovoltaic module according to the fault correspondence, the voltage data and the current data.
Optionally, the apparatus further comprises:
the prompting module is used for generating alarming prompting information under the condition that the photovoltaic module is determined to be in fault, and the alarming prompting information is used for prompting the photovoltaic module to be in fault.
In a third aspect, the present disclosure provides a non-transitory computer readable storage medium having stored thereon a computer program which, when executed by a processor, implements the steps of the fault determination method provided by the first aspect of the present disclosure.
In a fourth aspect, the present disclosure provides a photovoltaic device comprising: the photovoltaic modules are used for converting solar energy into electric energy; the power optimizers are connected with the photovoltaic module; a memory having a computer program stored thereon; a processor for executing the computer program in the memory to implement the steps of the fault determination method provided by the first aspect of the present disclosure.
Through the technical scheme, the photovoltaic device comprises a plurality of photovoltaic modules and a plurality of power optimizers, and the photovoltaic modules are connected with the power optimizers. First, an output voltage and an output current of each of the power optimizers are obtained. And then, according to the output voltages and the output currents, determining voltage data and current data corresponding to each photovoltaic module. And finally, determining whether the photovoltaic module fails according to the voltage data and the current data. The photovoltaic module fault detection method comprises the steps that a plurality of power optimizers are arranged and connected with the photovoltaic modules respectively, voltage data and current data of each photovoltaic module are detected through the power optimizers, and whether the photovoltaic modules have faults or not is determined according to the voltage data and the current data of the photovoltaic modules. Therefore, the effect of rapidly positioning the fault photovoltaic module is achieved, the time and cost required by operation and maintenance are reduced, and the operation and maintenance management capability is improved.
Additional features and advantages of the present disclosure will be set forth in the detailed description which follows.
Drawings
The accompanying drawings are included to provide a further understanding of the disclosure, and are incorporated in and constitute a part of this specification, illustrate the disclosure and together with the description serve to explain, but do not limit the disclosure. In the drawings:
FIG. 1 is a flow chart illustrating a method of determining a fault according to an exemplary embodiment.
FIG. 2 is a flow chart illustrating another method of fault determination according to an exemplary embodiment.
FIG. 3 is a flow chart illustrating another method of fault determination according to an exemplary embodiment.
FIG. 4 is a flow chart illustrating another method of fault determination according to an exemplary embodiment.
FIG. 5 is a flow chart illustrating another method of fault determination according to an exemplary embodiment.
Fig. 6 is a block diagram illustrating a fault determination apparatus according to an exemplary embodiment.
Fig. 7 is a block diagram of another fault determination apparatus according to an exemplary embodiment.
Fig. 8 is a block diagram of another fault determination apparatus according to an exemplary embodiment.
Fig. 9 is a block diagram of an electronic device, according to an example embodiment.
Fig. 10 is a block diagram of a photovoltaic device, according to an example embodiment.
Detailed Description
Specific embodiments of the present disclosure are described in detail below with reference to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating and illustrating the disclosure, are not intended to limit the disclosure.
The terms first, second and the like in the description and in the claims of the application and in the above-described figures, are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. In addition, in the description with reference to the drawings, the same reference numerals in different drawings denote the same elements.
In the description of the present disclosure, unless otherwise indicated, "a plurality" means two or more than two, and other adjectives are similar thereto; "at least one item", "an item" or "a plurality of items" or the like, refer to any combination of these items, including any combination of single item(s) or plural items(s). For example, at least one (a) may represent any number a; as another example, one (or more) of a, b, and c may represent: a, b, c, a-b, a-c, b-c, or a-b-c, wherein a, b, c may be single or plural; "and/or" is an association relationship describing an association object, meaning that there may be three relationships, e.g., a and/or B, which may represent: there are three cases, a alone, a and B together, and B alone, wherein a, B may be singular or plural. The character "/" indicates that the front-rear association object is an or relationship.
Although operations or steps are described in a particular order in the figures in the disclosed embodiments, it should not be understood as requiring that such operations or steps be performed in the particular order shown or in sequential order, or that all illustrated operations or steps be performed, to achieve desirable results. In embodiments of the present disclosure, these operations or steps may be performed serially; these operations or steps may also be performed in parallel; some of these operations or steps may also be performed.
The following describes specific embodiments of the present invention in detail with reference to the drawings.
FIG. 1 is a flow chart illustrating a method of determining a fault according to an exemplary embodiment applied to a photovoltaic device including a plurality of photovoltaic modules and a plurality of power optimizers to which the photovoltaic modules are coupled. The number of the power optimizers can be set according to actual demands, one or more power optimizers can be arranged, each power optimizer is connected with one photovoltaic module, and the power optimizers can be used for detecting voltage data and current data of the photovoltaic module. As shown in fig. 1, the method may include the steps of:
in step S101, the output voltage and output current of each of the power optimizers are acquired.
In step S102, voltage data and current data corresponding to each of the photovoltaic modules are determined according to the plurality of output voltages and the plurality of output currents.
In one possible implementation manner, the output voltage of the power optimizer may be directly used as voltage data corresponding to the photovoltaic module connected thereto, and the output current of the power optimizer may be directly used as current data corresponding to the photovoltaic module connected thereto.
In another possible implementation, in view of the loss of the circuit itself, in order to improve the accuracy of the voltage data and the current data of the photovoltaic module, the voltage weight and the current weight may be determined on the basis of an earlier experiment. That is, when determining the voltage data of the photovoltaic module, the output voltage of the corresponding power optimizer may be multiplied by the voltage weight to obtain the voltage data of the photovoltaic module. Similarly, when determining current data of the photovoltaic module, the output current of the corresponding power optimizer may be multiplied by the current weight to obtain the current data of the photovoltaic module.
In step S103, it is determined whether the photovoltaic module is malfunctioning according to the voltage data and the current data.
For photovoltaic modules, the voltage and current of the modules, strings, and arrays may vary abnormally from the normal operating range in the event of abnormal operating conditions and electrical equipment (including connections) problems. Therefore, in the present embodiment, it is possible to determine whether or not each photovoltaic module has failed by monitoring the voltage data and the current data of the photovoltaic module.
In a practical scenario, a plurality of photovoltaic modules are typically connected in series to form a photovoltaic string, and the plurality of photovoltaic strings may be connected in parallel. In order to improve the efficiency of fault diagnosis, a plurality of inverters may be provided, each inverter being connected to the photovoltaic string. The string current and the string voltage of the photovoltaic string can be detected by the inverter, and whether the photovoltaic string is abnormal or not is determined by the string current and the string voltage. For example, it may be determined whether the string current is within a preset string current range and/or whether the string voltage is within a preset string voltage range. If the string current is within a preset string current range and/or the string voltage is within a preset string voltage range, it may be determined that an abnormality exists in the string of photovoltaic groups. At this time, the step S101 to step S103 can be used to accurately locate the photovoltaic module with the fault in the photovoltaic string, so that the calculation amount can be greatly reduced, the diagnosis efficiency can be improved, and the diagnosis accuracy can be ensured at the same time when a plurality of photovoltaic strings exist.
Because photovoltaic equipment often sets up the scope wider, sets up the area more, in order that the technician of being convenient for can realize long-range to the control of data, in this embodiment, can also demonstrate and record the string voltage and the string current of photovoltaic group's cluster that the dc-to-ac converter detected to/or the voltage data and the current data of every photovoltaic module that the power optimizer detected, the present data and/or the historical data of every subassembly/group's cluster can be inquired in real time to the technician of being convenient for.
By adopting the method, a plurality of power optimizers are arranged in the method and are respectively connected with the photovoltaic modules, the voltage data and the current data of each photovoltaic module are detected through the power optimizers, and whether the photovoltaic modules have faults or not is further determined according to the voltage data and the current data of the photovoltaic modules. Therefore, the effect of rapidly positioning the fault photovoltaic module is achieved, the time and cost required by operation and maintenance are reduced, and the operation and maintenance management capability is improved.
The following describes the above step S103 in detail.
In one possible implementation manner, as shown in fig. 2, the determining whether the photovoltaic module fails according to the voltage data and the current data in the step S103 may include the following steps:
in step S1031, it is determined that the photovoltaic module is malfunctioning in a case where the voltage data is within a preset voltage range and/or the current data is within a preset current range.
In step S1032, if the voltage data is outside the preset voltage range and the current data is outside the preset current range, it is determined that the photovoltaic module is not failed.
It is understood that various abnormal operating conditions and faults in the system (including equipment) can cause abnormal changes in the voltage data and the current data of the photovoltaic module. Thus, in some embodiments, a preset voltage range corresponding to the abnormal voltage and a preset current range corresponding to the abnormal current may be preset. In the actual application process, whether the photovoltaic module fails or not can be determined by determining whether the voltage data is in a preset voltage range and/or whether the current data is in a preset current range.
In another possible implementation manner, as shown in fig. 3, the determining whether the photovoltaic module fails according to the voltage data and the current data in the step S103 may include the following steps:
In step S1033, for each of the photovoltaic modules, a target power of the photovoltaic module is determined according to the voltage data and the current data corresponding to the photovoltaic module.
For example, the product of the voltage data and the current data may be taken as the target power for the photovoltaic module.
In step S1034, it is determined whether the photovoltaic module is malfunctioning according to a plurality of the target powers. In some scenarios, multiple photovoltaic modules are connected in series to form a photovoltaic string, and the target power of each photovoltaic module should be similar in the same photovoltaic string. If an abnormality occurs in a certain photovoltaic module, a deviation exists between the target power of the photovoltaic module and the target power of other photovoltaic modules in the same photovoltaic group string. Thus, in this embodiment, determining whether the photovoltaic module is malfunctioning according to a plurality of the target powers may include: an average of the plurality of target powers is determined to obtain an average power. The average value of the target powers may be an average value of target powers corresponding to a plurality of photovoltaic modules in the same photovoltaic group string. And secondly, determining whether the photovoltaic module fails according to the target power and the average power.
For example, in a case where a difference between the target power and the average power is greater than or equal to a preset difference, determining that the photovoltaic module is malfunctioning; or under the condition that the difference value between the target power and the average power is smaller than the preset difference value, determining that the photovoltaic module is not in fault.
Further, in the case of determining that the photovoltaic module fails, the failure type may be further determined, where the failure type may be a plurality of preset failure types, and specifically may include: and acquiring a preset fault corresponding relation, wherein the fault corresponding relation comprises a corresponding relation among a fault type, a voltage range and a current range. And secondly, determining the fault type corresponding to the photovoltaic module according to the fault corresponding relation, the voltage data and the current data. For example, a target voltage range corresponding to the voltage data and a target current range corresponding to the current data may be determined first, and then, according to the fault correspondence, a fault type corresponding to the target voltage range and the target current range is determined, so as to obtain the fault type corresponding to the photovoltaic module.
That is, the fault correspondence may be obtained by presetting a voltage range and a current range corresponding to some typical fault types. Under the condition that the photovoltaic module is determined to be faulty, the current fault type is primarily judged according to the corresponding relation of the faults. And under the condition of determining the fault type, the fault type is displayed in a physical layout diagram, so that the fault diagnosis efficiency is improved. For the photovoltaic module with the failure type not determined, the photovoltaic module can be marked and displayed in a physical layout diagram, so that a technician can diagnose the photovoltaic module with the failure type not determined in time.
FIG. 4 is a flowchart illustrating another method of determining a fault, as shown in FIG. 4, according to an exemplary embodiment, the method may further include the steps of:
in step S104, when it is determined that the photovoltaic module fails, an alarm prompt message is generated.
The warning prompt message is used for prompting that the photovoltaic module fails. The alarm prompt information can be displayed through the physical layout diagram, so that technicians can timely master the current fault information, the operation and maintenance efficiency of the power grid fault is improved, and the normal operation of the power grid is not affected.
FIG. 5 is a flowchart illustrating another method of determining a fault, as shown in FIG. 5, according to an exemplary embodiment, the method may further include the steps of:
in step S105, in case it is determined that the photovoltaic module fails, the connection of the photovoltaic module with other photovoltaic modules in the photovoltaic device is disconnected by the power optimizer.
In some embodiments, if it is determined that the photovoltaic module fails, in order to avoid the influence of the failed photovoltaic module on other photovoltaic modules, the connection between the photovoltaic module and other photovoltaic modules in the photovoltaic device can be timely disconnected through the power optimizer, that is, the automatic shutdown of the failed module is realized, and the operation safety and stability of the whole system are ensured.
In addition, as can be seen from the foregoing description, a plurality of photovoltaic modules are connected in series to form a photovoltaic string, and each photovoltaic string is connected to an inverter, and the other end of the inverter is connected to the power grid. When the inverter recognizes a dc side disconnection fault (generally caused by a short circuit between the photovoltaic module and the inverter), the inverter can disconnect the connection between the dc side fault photovoltaic string and the inverter. When the inverter recognizes an ac side open fault (typically caused by a short circuit of the inverter to the grid side, etc.), the inverter may disconnect the direct connection to the grid side. Thereby guaranteeing the safety of the system operation.
By adopting the method, a plurality of power optimizers are arranged in the method and are respectively connected with the photovoltaic modules, the voltage data and the current data of each photovoltaic module are detected through the power optimizers, and whether the photovoltaic modules have faults or not is further determined according to the voltage data and the current data of the photovoltaic modules. Therefore, the effect of rapidly positioning the fault photovoltaic module is achieved, the time and cost required by operation and maintenance are reduced, and the operation and maintenance management capability is improved.
Fig. 6 is a block diagram of a fault determination apparatus according to an exemplary embodiment, which is applied to a photovoltaic device including a plurality of photovoltaic modules and a plurality of power optimizers to which the photovoltaic modules are connected, as shown in fig. 6, the apparatus 200 includes:
An acquisition module 201, configured to acquire an output voltage and an output current of each of the power optimizers;
A first determining module 202, configured to determine voltage data and current data corresponding to each of the photovoltaic modules according to a plurality of the output voltages and a plurality of the output currents;
And the second determining module 203 is configured to determine whether the photovoltaic module fails according to the voltage data and the current data.
Optionally, the second determining module 203 is configured to determine that the photovoltaic module fails when the voltage data is within a preset voltage range and/or the current data is within a preset current range; or under the condition that the voltage data is outside the preset voltage range and the current data is outside the preset current range, determining that the photovoltaic module is not in fault.
Optionally, the second determining module 203 is configured to determine, for each of the photovoltaic modules, a target power of the photovoltaic module according to the voltage data and the current data corresponding to the photovoltaic module; and determining whether the photovoltaic module fails according to a plurality of target powers.
Optionally, the second determining module 203 is configured to determine an average value of the plurality of target powers, to obtain an average power; and determining whether the photovoltaic module fails according to the target power and the average power.
Optionally, as shown in fig. 7, the apparatus 200 further includes:
and the disconnection module 204 is used for disconnecting the photovoltaic module from other photovoltaic modules in the photovoltaic equipment through the power optimizer under the condition that the photovoltaic module is determined to be in fault.
Optionally, in the case that it is determined that the photovoltaic module fails, the obtaining module 201 is further configured to obtain a preset failure correspondence, where the failure correspondence includes a correspondence among a failure type, a voltage range, and a current range;
The second determining module 203 is further configured to determine a fault type corresponding to the photovoltaic module according to the fault correspondence, the voltage data and the current data.
Optionally, as shown in fig. 8, the apparatus 200 further includes:
The prompting module 205 is configured to generate, when determining that the photovoltaic module fails, an alarm prompting message, where the alarm prompting message is used to prompt that the photovoltaic module fails.
By adopting the device, a plurality of power optimizers are arranged in the device and are respectively connected with the photovoltaic modules, voltage data and current data of each photovoltaic module are detected through the power optimizers, and whether the photovoltaic modules have faults or not is further determined according to the voltage data and the current data of the photovoltaic modules. Therefore, the effect of rapidly positioning the fault photovoltaic module is achieved, the time and cost required by operation and maintenance are reduced, and the operation and maintenance management capability is improved.
The specific manner in which the various modules perform the operations in the apparatus of the above embodiments have been described in detail in connection with the embodiments of the method, and will not be described in detail herein.
Fig. 9 is a block diagram of an electronic device, according to an example embodiment. For example, the electronic device 300 may be provided as a server. Referring to fig. 9, the electronic device 300 includes a processor 322, which may be one or more in number, and a memory 332 for storing a computer program executable by the processor 322. The computer program stored in memory 332 may include one or more modules each corresponding to a set of instructions. Further, the processor 322 may be configured to execute the computer program to perform the above-described fault determination method.
In addition, the electronic device 300 may further include a power supply component 326 and a communication component 350, the power supply component 326 may be configured to perform power management of the electronic device 300, and the communication component 350 may be configured to enable communication of the electronic device 300, such as wired or wireless communication. In addition, the electronic device 300 may also include an input/output (I/O) interface 358. The electronic device 300 may operate an operating system based on memory 332.
In another exemplary embodiment, a computer readable storage medium is also provided comprising program instructions which, when executed by a processor, implement the steps of the above-described fault determination method. For example, the non-transitory computer readable storage medium may be the memory 332 including program instructions described above that are executable by the processor 322 of the electronic device 300 to perform the fault determination method described above.
In another exemplary embodiment, a computer program product is also provided, which comprises a computer program executable by a programmable apparatus, the computer program having code portions for performing the above-mentioned fault determination method when being executed by the programmable apparatus.
Fig. 10 is a block diagram of a photovoltaic apparatus according to an exemplary embodiment, the photovoltaic apparatus 400 including an electronic apparatus 300, a plurality of photovoltaic modules 401, and a plurality of power optimizers 402, the plurality of photovoltaic modules 401 for converting solar energy into electrical energy, as shown in fig. 10; and a power optimizer 402 connected with the photovoltaic module 401. Illustratively, each photovoltaic module 401 is connected to a power optimizer 402, which is connected to the next photovoltaic module 401, and so on, until the last power optimizer 402 is connected.
The preferred embodiments of the present disclosure have been described in detail above with reference to the accompanying drawings, but the present disclosure is not limited to the specific details of the embodiments described above, and various simple modifications may be made to the technical solutions of the present disclosure within the scope of the technical concept of the present disclosure, and all the simple modifications belong to the protection scope of the present disclosure.
In addition, the specific features described in the foregoing embodiments may be combined in any suitable manner, and in order to avoid unnecessary repetition, the present disclosure does not further describe various possible combinations.
Moreover, any combination between the various embodiments of the present disclosure is possible as long as it does not depart from the spirit of the present disclosure, which should also be construed as the disclosure of the present disclosure.

Claims (10)

1. A method of determining a fault, characterized by being applied to a photovoltaic device comprising a plurality of photovoltaic modules and a plurality of power optimizers, the photovoltaic modules being connected to the power optimizers, the method comprising:
obtaining the output voltage and the output current of each power optimizer;
Determining voltage data and current data corresponding to each photovoltaic module according to the output voltages and the output currents;
And determining whether the photovoltaic module fails according to the voltage data and the current data.
2. The method of claim 1, wherein determining whether the photovoltaic module is malfunctioning based on the voltage data and the current data comprises:
Determining that the photovoltaic module fails under the condition that the voltage data is in a preset voltage range and/or the current data is in a preset current range; or alternatively
And under the condition that the voltage data is outside the preset voltage range and the current data is outside the preset current range, determining that the photovoltaic module is not in fault.
3. The method of claim 1, wherein determining whether the photovoltaic module is malfunctioning based on the voltage data and the current data comprises:
Determining target power of each photovoltaic module according to the voltage data and the current data corresponding to the photovoltaic module;
And determining whether the photovoltaic module fails according to the target powers.
4. The method of claim 3, wherein determining whether the photovoltaic module is malfunctioning based on a plurality of the target powers comprises:
Determining the average value of a plurality of target powers to obtain average power;
and determining whether the photovoltaic module fails according to the target power and the average power.
5. The method according to claim 1, wherein the method further comprises:
and under the condition that the photovoltaic module is determined to be faulty, disconnecting the photovoltaic module from other photovoltaic modules in the photovoltaic equipment through the power optimizer.
6. The method of claim 1, wherein in the event that a failure of the photovoltaic module is determined, the method further comprises:
Acquiring a preset fault corresponding relation, wherein the fault corresponding relation comprises a corresponding relation among a fault type, a voltage range and a current range;
And determining the fault type corresponding to the photovoltaic module according to the fault corresponding relation, the voltage data and the current data.
7. The method according to any one of claims 1 to 6, further comprising:
and under the condition that the photovoltaic module is determined to be faulty, generating alarm prompt information, wherein the alarm prompt information is used for prompting the photovoltaic module to be faulty.
8. A fault determination apparatus for use with a photovoltaic device comprising a plurality of photovoltaic modules and a plurality of power optimizers, the photovoltaic modules being connected to the power optimizers, the apparatus comprising:
The acquisition module is used for acquiring the output voltage and the output current of each power optimizer;
The first determining module is used for determining voltage data and current data corresponding to each photovoltaic module according to the output voltages and the output currents;
and the second determining module is used for determining whether the photovoltaic module fails according to the voltage data and the current data.
9. A non-transitory computer readable storage medium having stored thereon a computer program, characterized in that the program when executed by a processor realizes the steps of the method according to any of claims 1 to 7.
10. A photovoltaic device, comprising:
the photovoltaic modules are used for converting solar energy into electric energy;
the power optimizers are connected with the photovoltaic module;
a memory having a computer program stored thereon;
A processor for executing the computer program in the memory to implement the steps of the method of any one of claims 1 to 7.
CN202311683685.XA 2023-12-08 2023-12-08 Fault determination method and device, storage medium and photovoltaic equipment Pending CN117914255A (en)

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Applications Claiming Priority (1)

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CN202311683685.XA CN117914255A (en) 2023-12-08 2023-12-08 Fault determination method and device, storage medium and photovoltaic equipment

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CN117914255A true CN117914255A (en) 2024-04-19

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