CN112383054A - Photovoltaic power generation system, fault processing method thereof and power generation equipment - Google Patents
Photovoltaic power generation system, fault processing method thereof and power generation equipment Download PDFInfo
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- CN112383054A CN112383054A CN202011303904.3A CN202011303904A CN112383054A CN 112383054 A CN112383054 A CN 112383054A CN 202011303904 A CN202011303904 A CN 202011303904A CN 112383054 A CN112383054 A CN 112383054A
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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
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
- Y04S10/123—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation the energy generation units being or involving renewable energy sources
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
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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
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/124—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wired telecommunication networks or data transmission busses
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Computer Networks & Wireless Communication (AREA)
- Photovoltaic Devices (AREA)
Abstract
The invention discloses a photovoltaic power generation system, a fault processing method thereof and power generation equipment. Wherein, photovoltaic power generation system includes: a plurality of photovoltaic modules connected in series; the system comprises a plurality of photovoltaic modules, a first switch, a second switch and a control circuit, wherein the positive port of each photovoltaic module is provided with the first switch, a branch is built between the two ends of each photovoltaic module, and the second switch is arranged on the branch; the photovoltaic module is connected with the first switch in series and then connected with the second switch in parallel; and each photovoltaic module is provided with an energy monitoring module for monitoring the voltage of each photovoltaic module. According to the invention, the reduction of the generated energy of the whole photovoltaic power generation system is reduced to the greatest extent, faults can be checked in time, the benefits of the photovoltaic power generation system are ensured, and the efficiency and the stability of the photovoltaic power generation system are improved.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic power generation system, a fault processing method thereof and power generation equipment.
Background
With the gradual large-scale popularization of photovoltaic power generation systems, the continuous operation of photovoltaic modules (also called photovoltaic panels) is more and more emphasized, when a photovoltaic module breaks down, the existing solution is to directly disconnect the photovoltaic modules connected in series behind when a photovoltaic module in the middle of the whole series-connected photovoltaic modules breaks down, so that a lot of original photovoltaic modules which can be continuously used are actually left unused, the resource waste is caused, the power generation power of the photovoltaic power generation systems is reduced, and the benefit of the photovoltaic power generation systems is influenced.
Aiming at the problem that the fault processing scheme of the photovoltaic power generation system in the prior art cannot effectively utilize the photovoltaic module, an effective solution is not provided at present.
Disclosure of Invention
The embodiment of the invention provides a photovoltaic power generation system, a fault processing method thereof and power generation equipment, and aims to solve the problem that a fault processing scheme of the photovoltaic power generation system in the prior art cannot effectively utilize a photovoltaic module.
In order to solve the above technical problem, the present invention provides a photovoltaic power generation system, wherein the photovoltaic power generation system includes: a plurality of photovoltaic modules connected in series; the system comprises a plurality of photovoltaic modules, a first switch, a second switch and a control circuit, wherein the positive port of each photovoltaic module is provided with the first switch, a branch is built between the two ends of each photovoltaic module, and the second switch is arranged on the branch; the photovoltaic module is connected with the first switch in series and then connected with the second switch in parallel; each photovoltaic module is provided with an energy monitoring module for monitoring the voltage of each photovoltaic module; and the voltage is used for judging the working state of the photovoltaic module, so that the opening and closing of the first switch and the second switch corresponding to the photovoltaic module are further controlled.
Further, the photovoltaic power generation system further includes: the collection flow box is connected to the series branch circuits of all the photovoltaic modules and used for supplying power to the photovoltaic modules.
Further, the photovoltaic power generation system further includes: the energy monitoring module and the combiner box are connected with the gateway through a communication bus; the first switch and the second switch are both connected with the gateway.
Further, the first switch is a normally closed switch, and the second switch is a normally open switch.
The invention also provides a fault processing method of the photovoltaic power generation system, which is applied to the photovoltaic power generation system, wherein the method comprises the following steps: monitoring the working state of each photovoltaic assembly of the photovoltaic power generation system; when the photovoltaic module with the abnormal working state is monitored, the photovoltaic module with the abnormal working state is disconnected, and normal working of other photovoltaic modules is guaranteed.
Further, monitoring the operating state of each photovoltaic module of the photovoltaic power generation system comprises: monitoring the voltage of each photovoltaic module according to an energy monitoring module arranged on each photovoltaic module; if the voltage of the photovoltaic module is zero, judging that the working state of the photovoltaic module is an abnormal state; and if the difference value between the voltage of the photovoltaic module and the voltages of other photovoltaic modules exceeds a preset value, judging that the working state of the photovoltaic module is an abnormal state.
Further, the photovoltaic module in an abnormal state is disconnected, and normal operation of other photovoltaic modules is ensured, including: and controlling the first switch corresponding to the photovoltaic module in the abnormal state to be turned on and controlling the second switch corresponding to the photovoltaic module to be turned off.
Further, when the photovoltaic module in the abnormal state is monitored, the photovoltaic module in the abnormal state is disconnected, and normal operation of other photovoltaic modules is ensured, the method further comprises the following steps: monitoring the working state of the photovoltaic module in an abnormal state; and when the working state is monitored to be changed into a normal state, controlling the photovoltaic module to be connected into a photovoltaic power generation system.
Further, control this photovoltaic module and insert photovoltaic power generation system, include: and controlling the first switch corresponding to the photovoltaic module to be closed and controlling the second switch corresponding to the photovoltaic module to be opened.
The invention also provides power generation equipment, wherein the power generation equipment comprises the photovoltaic power generation system.
The invention also provides a computer-readable storage medium, on which a computer program is stored, wherein the program, when executed by a processor, implements the method as described above.
By applying the technical scheme of the invention, when one or more photovoltaic modules in the whole photovoltaic power generation system have faults, only the photovoltaic module with the fault is cut off through self-adaptive adjustment of the photovoltaic modules, and the rest photovoltaic modules can be normally used to continue power generation and supply, so that the whole photovoltaic power generation system can reduce the reduction of the generated energy to the maximum extent, and can also check the faults in time, the benefit of the photovoltaic power generation system is ensured, and the efficiency and the stability of the photovoltaic power generation system are improved.
Drawings
FIG. 1 is a schematic structural diagram of a photovoltaic power generation system according to an embodiment of the present invention;
FIG. 2 is a schematic diagram of the connection of an energy monitoring module according to an embodiment of the invention;
FIG. 3 is a flow chart of a method of fault handling for a photovoltaic power generation system according to an embodiment of the present invention;
fig. 4 is a control flowchart of the photovoltaic power generation system according to the embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention clearer, the present invention will be described in further detail with reference to the accompanying drawings, and it is apparent that the described embodiments are only a part of the embodiments of the present invention, not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise, and "a plurality" typically includes at least two.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
The words "if", as used herein, may be interpreted as "at … …" or "at … …" or "in response to a determination" or "in response to a detection", depending on the context. Similarly, the phrases "if determined" or "if detected (a stated condition or event)" may be interpreted as "when determined" or "in response to a determination" or "when detected (a stated condition or event)" or "in response to a detection (a stated condition or event)", depending on the context.
It is also noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other like elements in the article or device in which the element is included.
Alternative embodiments of the present invention are described in detail below with reference to the accompanying drawings.
Example 1
Fig. 1 is a schematic structural diagram of a photovoltaic power generation system according to an embodiment of the present invention, and as shown in fig. 1, the photovoltaic power generation system includes: a plurality of photovoltaic modules (illustrated in figure 1 as 5 photovoltaic modules) in series. This embodiment adds contactor (relay) and energy monitoring module on every photovoltaic module, and energy monitoring module and collection flow box pass through RS485 communication bus and link to each other with the gateway. And monitoring and controlling the state of the photovoltaic component are realized.
The positive port of each photovoltaic module is provided with a first switch NC (such as NC1 and NC2 … … NC5), a branch is built between the two ends of each photovoltaic module, and a second switch NO (such as NO1 and NO2 … … NO5) is arranged on the branch. The photovoltaic module is connected with the first switch in series and then is connected with the second switch in parallel. Each photovoltaic module is provided with an energy monitoring module for monitoring the voltage of each photovoltaic module; the voltage is used for judging the working state of the photovoltaic module, so that the opening and closing of the first switch and the second switch corresponding to the photovoltaic module are further controlled.
It should be noted that the above-mentioned operating states include a normal state and an abnormal state, and the abnormal state includes a fault or a low generated power. And if the voltage monitored by the energy monitoring module is zero, indicating that the photovoltaic module corresponding to the energy monitoring module has a fault. If the difference value of the voltage monitored by the energy monitoring module is larger than the voltages of other photovoltaic modules (the difference value exceeds a preset value), the power generation power of the photovoltaic module corresponding to the energy monitoring module is low.
And for the photovoltaic modules in the abnormal state, the photovoltaic modules are disconnected, and the other photovoltaic modules in the normal state are kept for continuously generating power and supplying power. When the photovoltaic power generation system is in initial operation, the first switch of each photovoltaic module is in a normally closed state, and the second switch of each photovoltaic module is in a normally open state. If one or more photovoltaic modules (photovoltaic modules in abnormal states) need to be disconnected, the corresponding first switch is controlled to be opened, and the second switch is controlled to be closed. Based on this, through self-adaptation adjustment photovoltaic module, only cut off the photovoltaic module that breaks down, all the other photovoltaic modules all can normally use and can continue the electricity generation power supply for whole photovoltaic power generation system furthest reduces the decline of generated energy, also can in time troubleshoot the trouble, ensures photovoltaic power generation system's benefit, improves photovoltaic power generation system's efficiency and stability.
The photovoltaic power generation system further includes: the collection flow box is connected to the series branch circuits of all the photovoltaic modules and used for supplying power to the photovoltaic modules. The photovoltaic power generation system further comprises a gateway, and the energy monitoring module is schematically connected as shown in fig. 2, and the energy monitoring module and the combiner box are connected with the gateway through a communication bus, so that the working state of the photovoltaic component is monitored. The first switch and the second switch are connected with a gateway DO (or an expansion DO control module) interface and are controlled by outputting a 24V signal. The first switch is a normally closed switch, and the second switch is a normally open switch. Only when need cut off photovoltaic module, first switch is converted into the open mode by normally closed state, and the second switch is converted into the closed mode by normally open state.
When the photovoltaic module breaks down, the original photovoltaic power generation system is disconnected, the gateway reads the current information of the junction box, and if the power generation current value is zero, the gateway outputs signals to control all the first switches to be turned on. And the voltage value of each energy monitoring module is read, and the voltage value of each energy monitoring module can also be directly monitored. The photovoltaic module corresponding to the energy monitoring module with the voltage value of zero is disconnected due to faults, the first switch corresponding to the normal photovoltaic module is recovered to be normally closed, the gateway outputs signals to control the first switch corresponding to the fault photovoltaic module to be opened, and the second switch is closed, so that the fault photovoltaic module is disconnected from the original photovoltaic power generation system.
When the photovoltaic module is aged due to faults, the power generation power of a single photovoltaic module is reduced, and the photovoltaic module is still connected to a photovoltaic power generation system in a conduction state, a barrel effect can occur, and the power generation power of the whole photovoltaic power generation system is reduced. Under the condition that the system normally operates (the condition of uneven illumination is ignored), the gateway judges the service condition of the photovoltaic module by reading the voltage value of the energy monitoring module on the photovoltaic module, when the deviation between the voltage value of the photovoltaic module and the voltage values of other photovoltaic modules is large, the service condition of the photovoltaic module is judged to be low, and the gateway outputs signals to control the first switch of the photovoltaic module to be opened and the second switch to be closed so as to be disconnected from the original photovoltaic power generation system. The whole photovoltaic power generation system can reduce the decline of the generated energy to the maximum extent, and can also check faults in time, thereby ensuring the benefits of the photovoltaic power generation system and improving the efficiency and the stability of the photovoltaic power generation system.
The embodiment also provides a power generation device, which includes the photovoltaic power generation system described above.
Example 2
Fig. 3 is a flowchart of a method for handling a fault of a photovoltaic power generation system according to an embodiment of the present invention, as shown in fig. 3, the method including the steps of:
step S301, monitoring the working state of each photovoltaic module of the photovoltaic power generation system;
step S302, when the photovoltaic module with the abnormal working state is monitored, the photovoltaic module with the abnormal working state is disconnected, and normal working of other photovoltaic modules is ensured.
It should be noted that the operating state of the photovoltaic module includes a normal state and an abnormal state, and the abnormal state includes a fault or a low generated power. And if the voltage monitored by the energy monitoring module is zero, indicating that the photovoltaic module corresponding to the energy monitoring module has a fault. If the difference value of the voltage monitored by the energy monitoring module is larger than the voltages of other photovoltaic modules (the difference value exceeds a preset value), the power generation power of the photovoltaic module corresponding to the energy monitoring module is low.
Specifically, the voltage of each photovoltaic module is monitored according to an energy monitoring module arranged on each photovoltaic module; if the voltage of the photovoltaic module is zero, judging that the working state of the photovoltaic module is an abnormal state; and if the difference value between the voltage of the photovoltaic module and the voltages of other photovoltaic modules exceeds a preset value, judging that the working state of the photovoltaic module is an abnormal state. Based on the method, the photovoltaic module with faults or low power generation power can be accurately and timely monitored, so that fault processing reaction can be timely made, and the influence on the whole photovoltaic power generation system is reduced.
When the photovoltaic module is applied specifically, the photovoltaic module in an abnormal state is disconnected, and normal work of other photovoltaic modules is ensured, and the photovoltaic module is realized by the following technical means: and controlling the first switch corresponding to the photovoltaic module in the abnormal state to be turned on and controlling the second switch corresponding to the photovoltaic module to be turned off. The first switch is a normally closed switch, and the second switch is a normally open switch. Only when need cut off photovoltaic module, first switch is converted into the open mode by normally closed state, and the second switch is converted into the closed mode by normally open state.
Based on this, when one or more photovoltaic modules in the whole photovoltaic power generation system break down, the photovoltaic modules are adjusted in a self-adaptive mode, only the photovoltaic modules which break down are cut off, and the rest photovoltaic modules can be used normally to continue power generation and supply, so that the reduction of the generated energy of the whole photovoltaic power generation system is reduced to the maximum extent, the faults can be checked in time, the benefits of the photovoltaic power generation system are guaranteed, and the efficiency and the stability of the photovoltaic power generation system are improved.
After the photovoltaic module in the abnormal state is disconnected and normal work of other photovoltaic modules is ensured, the working state of the photovoltaic module in the abnormal state is continuously monitored; and when the working state is monitored to be changed into a normal state, controlling the photovoltaic module to be connected into a photovoltaic power generation system. Specifically, a first switch corresponding to the photovoltaic module is controlled to be closed, and a second switch corresponding to the photovoltaic module is controlled to be opened. Based on this, after photovoltaic module resumes normally, can in time insert whole photovoltaic power generation system to guarantee photovoltaic power generation system's benefit, improve photovoltaic power generation system's efficiency.
Example 3
Under the condition that the self-adaptive photovoltaic power generation system is built, the invention not only can enable the whole photovoltaic power generation system to only pause the fault photovoltaic component, but also can enable the photovoltaic power generation system to reduce the reduction of the generated energy to the maximum extent.
Fig. 4 is a control flowchart of the photovoltaic power generation system according to the embodiment of the present invention, as shown in fig. 4, the flowchart includes:
step S401, monitoring the working states of all photovoltaic modules. When a faulty photovoltaic module (which means that a fault occurs and/or the power generation power is low), corresponding actions can be simultaneously detected at the first time, and if no faulty photovoltaic module occurs, the working state of the photovoltaic module is continuously monitored. Based on this, can in time troubleshoot trouble photovoltaic module, guarantee whole photovoltaic power generation system's stability.
Step S402, determine whether there is a failure of the photovoltaic module. If yes, step S403 is performed, and if no, step S401 is performed.
And S403, cutting off the failed photovoltaic module and ensuring the normal use of the rest photovoltaic modules.
The photovoltaic modules of the existing photovoltaic power generation system are connected in series, the invention transforms the original photovoltaic power generation system, only cuts off the failed photovoltaic module, and the rest photovoltaic modules can be normally used to continue power generation and supply. Therefore, the novel photovoltaic power generation system is ensured to operate safely and stably, and the fault photovoltaic module can be checked and replaced at the moment. By the scheme, the photovoltaic module can adapt to the problem of faults, the reduction of the power generation power is reduced, and the efficient and stable operation of a photovoltaic power generation system is ensured.
Example 4
The embodiment of the present invention provides software for implementing the technical solutions described in the above embodiments and preferred embodiments.
Embodiments of the present invention provide a non-volatile computer storage medium, where computer-executable instructions are stored, and the computer-executable instructions may execute the fault handling method of the photovoltaic power generation system in any of the above method embodiments.
The storage medium stores the software, and the storage medium includes but is not limited to: optical disks, floppy disks, hard disks, erasable memory, etc.
The product can execute the method provided by the embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. For technical details that are not described in detail in this embodiment, reference may be made to the method provided by the embodiment of the present invention.
Through the above description of the embodiments, those skilled in the art will clearly understand that each embodiment can be implemented by software plus a necessary general hardware platform, and certainly can also be implemented by hardware. With this understanding in mind, the above-described technical solutions may be embodied in the form of a software product, which can be stored in a computer-readable storage medium such as ROM/RAM, magnetic disk, optical disk, etc., and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute the methods described in the embodiments or some parts of the embodiments.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions of the embodiments of the present invention.
Claims (11)
1. A photovoltaic power generation system, characterized in that the photovoltaic power generation system comprises: a plurality of photovoltaic modules connected in series; wherein the content of the first and second substances,
a first switch is arranged at the positive port of each photovoltaic module, a branch is built between the two ends of each photovoltaic module, and a second switch is arranged on the branch; the photovoltaic module is connected with the first switch in series and then connected with the second switch in parallel;
each photovoltaic module is provided with an energy monitoring module for monitoring the voltage of each photovoltaic module; and the voltage is used for judging the working state of the photovoltaic module, so that the opening and closing of the first switch and the second switch corresponding to the photovoltaic module are further controlled.
2. The photovoltaic power generation system of claim 1, further comprising:
the collection flow box is connected to the series branch circuits of all the photovoltaic modules and used for supplying power to the photovoltaic modules.
3. The photovoltaic power generation system of claim 1, further comprising:
the energy monitoring module and the combiner box are connected with the gateway through a communication bus; the first switch and the second switch are both connected with the gateway.
4. Photovoltaic power generation system according to claim 1,
the first switch is a normally closed switch, and the second switch is a normally open switch.
5. A fault handling method of a photovoltaic power generation system, applied to the photovoltaic power generation system according to any one of claims 1 to 4, the method comprising:
monitoring the working state of each photovoltaic assembly of the photovoltaic power generation system;
when the photovoltaic module with the abnormal working state is monitored, the photovoltaic module with the abnormal working state is disconnected, and normal working of other photovoltaic modules is guaranteed.
6. The method of claim 5, wherein monitoring the operating state of each photovoltaic module of the photovoltaic power generation system comprises:
monitoring the voltage of each photovoltaic module according to an energy monitoring module arranged on each photovoltaic module;
if the voltage of the photovoltaic module is zero, judging that the working state of the photovoltaic module is an abnormal state;
and if the difference value between the voltage of the photovoltaic module and the voltages of other photovoltaic modules exceeds a preset value, judging that the working state of the photovoltaic module is an abnormal state.
7. The method of claim 5, wherein disconnecting the photovoltaic module in the abnormal state and ensuring the normal operation of other photovoltaic modules comprises:
and controlling the first switch corresponding to the photovoltaic module in the abnormal state to be turned on and controlling the second switch corresponding to the photovoltaic module to be turned off.
8. The method according to claim 5, wherein when the photovoltaic module in the abnormal state is monitored, the photovoltaic module in the abnormal state is disconnected, and normal operation of other photovoltaic modules is ensured, and the method further comprises the following steps:
monitoring the working state of the photovoltaic module in an abnormal state;
and when the working state is monitored to be changed into a normal state, controlling the photovoltaic module to be connected into a photovoltaic power generation system.
9. The method of claim 8, wherein controlling the photovoltaic module to access the photovoltaic power generation system comprises:
and controlling the first switch corresponding to the photovoltaic module to be closed and controlling the second switch corresponding to the photovoltaic module to be opened.
10. A power plant characterized in that it comprises a photovoltaic power generation system according to any one of claims 1 to 4.
11. A computer-readable storage medium, on which a computer program is stored, which program, when being executed by a processor, carries out the method according to any one of claims 5 to 9.
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