Photovoltaic power station anomaly judgment method, system and equipment based on string and medium

Abstract

The invention discloses a string-based photovoltaic power station abnormity judgment method, system and device and a medium. The method comprises the following steps: judging an abnormal string in a normal power generation photovoltaic inverter; counting the abnormal string rate of the normal power generation photovoltaic inverter every day; and judging whether the photovoltaic power station is abnormal or not according to the abnormal string rate of the daily normal power generation photovoltaic inverter. The method, the system, the equipment and the medium can accurately judge whether the photovoltaic power station is abnormal or not.

Description

Technical Field

[0001] The present invention belongs to the field of new energy photovoltaic string data collection and status monitoring, and relates to a photovoltaic power station abnormality judgment method, system, equipment and medium based on strings. Background Art

[0002] There are many photovoltaic strings in new energy photovoltaic sites, and the problem of long-term non-power generation is prominent, which seriously affects the power generation efficiency of photovoltaic power stations. It is urgent to strengthen the monitoring and management of photovoltaic strings by sites, 2 / 3-level companies and groups, and improve the efficiency of sites in handling abnormal strings. Based on the above problems, abnormal situations of photovoltaic power stations cannot be judged, which seriously affects the accurate grasp of the operation of photovoltaic power stations by sites, 2 / 3-level companies and groups. Summary of the invention

[0003] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art and provide a method, system, device and medium for judging abnormality of a photovoltaic power station based on strings. The method, system, device and medium can accurately judge whether a photovoltaic power station is abnormal.

[0004] In order to achieve the above object, the present invention adopts the following technical scheme:

[0005] In one aspect, the present invention provides a method for determining abnormality in a photovoltaic power station based on strings, comprising:

[0006] Determine abnormal strings in normal power generation photovoltaic inverters;

[0007] Statistics on abnormal string rate of photovoltaic inverters with normal power generation every day;

[0008] Whether the photovoltaic power station is abnormal is determined based on the abnormal string rate of the photovoltaic inverters that generate normal power every day.

[0009] The method for determining abnormality of a photovoltaic power station based on strings of the present invention is further improved in that:

[0010] Furthermore, the process of determining the abnormal strings in the normal power generation photovoltaic inverter is as follows:

[0011] Determine whether the photovoltaic inverter in the photovoltaic power station is a normal power generation photovoltaic inverter;

[0012] When the photovoltaic inverter in the photovoltaic power station is a normal power generation photovoltaic inverter, the current data of each string under the normal power generation photovoltaic inverter is collected at preset intervals, and the current data of the strings collected throughout the day are unified;

[0013] When the current of any string is constant throughout the day or the current throughout the day is less than the preset current value, the string is considered to be an abnormal string; otherwise, the string is considered to be a normal string.

[0014] Furthermore, the process of determining whether the photovoltaic inverter in the photovoltaic power station is a normal photovoltaic inverter is as follows:

[0015] The power and irradiance data of the photovoltaic inverter are collected at preset intervals, and the power and irradiance data collected within one day are counted. The statistically obtained power and irradiance data are abnormally screened out. When the total number of data after screening out is greater than 1, it indicates that the photovoltaic inverter is a normal power generation photovoltaic inverter.

[0016] Furthermore, the abnormal string rate = the number of abnormal strings under the normal power generation photovoltaic inverter / the number of all strings under the normal power generation photovoltaic inverter.

[0017] Furthermore, the process of judging whether the photovoltaic power station is abnormal based on the abnormal string rate of the photovoltaic inverters that generate normal power every day is as follows:

[0018] When the abnormal string rate is greater than or equal to 1% for a preset number of consecutive days, the photovoltaic power station is considered to be abnormal; otherwise, the photovoltaic power station is considered to be normal.

[0019] In a second aspect of the present invention, the present invention provides a photovoltaic power station abnormality judgment system based on strings, comprising:

[0020] The first judgment module is used to judge abnormal strings in the normal power generation photovoltaic inverter;

[0021] The statistics module is used to count the abnormal string rate of photovoltaic inverters that generate power normally every day;

[0022] The second judgment module is used to judge whether the photovoltaic power station is abnormal according to the abnormal string rate of the photovoltaic inverters that generate normal power every day.

[0023] The photovoltaic power station abnormality judgment system based on strings of the present invention is further improved in that:

[0024] Furthermore, the first determination module includes:

[0025] The third judgment module is used to judge whether the photovoltaic inverter in the photovoltaic power station is a normal power generation photovoltaic inverter;

[0026] The summary module is used for collecting the current data of each string under the photovoltaic inverter for normal power generation at preset intervals when the photovoltaic inverter in the photovoltaic power station is a normal power generation photovoltaic inverter, and unifying the current data of the strings collected throughout the day;

[0027] The fourth judgment module is used to consider any string group as an abnormal string group when the all-day current of the string group is constant or the all-day current is less than a preset current value; otherwise, the string group is considered to be a normal string group.

[0028] Furthermore, the process of judging whether the photovoltaic inverter in the photovoltaic power station is a normal photovoltaic inverter is as follows:

[0029] The power and irradiance data of the photovoltaic inverter are collected at preset intervals, and the power and irradiance data collected within one day are counted. The statistically obtained power and irradiance data are abnormally screened out. When the total number of data after screening out is greater than 1, it indicates that the photovoltaic inverter is a normal power generation photovoltaic inverter.

[0030] In a third aspect of the present invention, the present invention provides a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the steps of the string-based photovoltaic power station abnormality judgment method when executing the computer program.

[0031] In a fourth aspect of the present invention, the present invention provides a computer-readable storage medium, wherein the computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the photovoltaic power station abnormality judgment method based on strings are implemented.

[0032] The present invention has the following beneficial effects:

[0033] The method, system, device and medium for judging abnormality of a photovoltaic power station based on strings described in the present invention, during specific operation, count the abnormal string rate of photovoltaic inverters that generate electricity normally every day, and judge whether the photovoltaic power station is abnormal according to the abnormal string rate of photovoltaic inverters that generate electricity normally every day, so as to judge the abnormality of the photovoltaic power station. The operation is simple, convenient and highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0035] Figure 1 It is a flow chart of the present invention. DETAILED DESCRIPTION

[0036] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it should be understood that the terms “include” and “comprises” indicate the presence of described features, wholes, steps, operations, elements and / or components, but do not exclude the presence or addition of one or more other features, wholes, steps, operations, elements, components and / or collections thereof.

[0038] It should also be understood that the terms used in the present specification are only for the purpose of describing specific embodiments and are not intended to limit the present invention. As used in the present specification and the appended claims, unless the context clearly indicates otherwise, the singular forms "a", "an" and "the" are intended to include plural forms.

[0039] It should be further understood that the term "and / or" used in the present specification and the appended claims refers to any combination of one or more of the associated listed items and all possible combinations, and includes these combinations. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in the present invention generally indicates that the associated objects are in an "or" relationship.

[0040] It should be understood that, although the terms first, second, third, etc. may be used to describe preset ranges, etc. in the embodiments of the present invention, these preset ranges should not be limited to these terms. These terms are only used to distinguish preset ranges from each other. For example, without departing from the scope of the embodiments of the present invention, the first preset range may also be referred to as the second preset range, and similarly, the second preset range may also be referred to as the first preset range.

[0041] The word "if" as used herein may be interpreted as "at the time of" or "when" or "in response to determining" or "in response to detecting", depending on the context. Similarly, the phrases "if it is determined" or "if (stated condition or event) is detected" may be interpreted as "when it is determined" or "in response to determining" or "when detecting (stated condition or event)" or "in response to detecting (stated condition or event)", depending on the context.

[0042] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. The components of the embodiments of the present invention described and shown in the drawings here can usually be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the claimed invention, but merely represents selected embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0043] Various structural schematic diagrams of the embodiments disclosed in the present invention are shown in the accompanying drawings. These figures are not drawn to scale, and some details are magnified and some details may be omitted for the purpose of clear expression. The shapes of various regions and layers shown in the figures and the relative sizes and positional relationships therebetween are only exemplary, and may deviate in practice due to manufacturing tolerances or technical limitations, and those skilled in the art may additionally design regions / layers with different shapes, sizes, and relative positions according to actual needs.

[0044] Embodiment 1

[0045] refer to Figure 1 In order to strengthen the monitoring and management of photovoltaic strings by the site, 2 / 3-level companies and groups, and effectively improve the efficiency of photovoltaic sites in handling non-power-generating strings, this embodiment provides a method for determining abnormalities of photovoltaic power stations based on strings, including the following steps:

[0046] 1) Determine abnormal strings in normal power generation photovoltaic inverters;

[0047] The power and irradiance data of the photovoltaic inverter are collected at a preset interval of 5 seconds, and the data collected within one day are counted. The statistically obtained data are screened for abnormalities. When the total number of the screened data is greater than 1, it indicates that the photovoltaic inverter is a normal power generation photovoltaic inverter;

[0048] The process of filtering out abnormalities from statistical data is as follows:

[0049] Filter out data with constant values, filter out data with power less than 0.1 kWh, and filter out data with total daily irradiance less than 0 W / m2 or greater than 1200 W / m2.

[0050] The current data of the strings under the normal power generation photovoltaic inverter are collected at a preset interval of 5s, and the current data of the strings collected within one day are counted. When the current of any string is constant throughout the day or the current is less than 0.1A throughout the day, the string is identified as an abnormal string, otherwise, the string is regarded as a normal string;

[0051] 2) Count the abnormal string rate every day, where the abnormal string rate = the number of abnormal strings under the normal power generation photovoltaic inverter / the number of all strings under the normal power generation photovoltaic inverter;

[0052] 3) When the abnormal string rate is greater than or equal to 1% for a preset number of consecutive days, the photovoltaic power station is considered abnormal; otherwise, the photovoltaic power station is considered normal;

[0053] In addition, when a photovoltaic power station is judged to be abnormal, when the abnormal string rate is less than 1%, it is considered that the photovoltaic power station has returned to normal.

[0054] In addition, this embodiment also includes:

[0055] Record the process data of each step to verify the results to ensure the correctness of abnormal data of the photovoltaic power station.

[0056] Through the above process, the present invention automatically determines whether the photovoltaic station is abnormal from the massive photovoltaic inverter and string data, and pushes the abnormal data to the 2 / 3 level companies and groups in the form of alarms, helping the stations to improve the management and maintenance of abnormal strings, thereby achieving an increase in power generation.

[0057] It should be noted that the present invention determines the abnormality of the photovoltaic power station based on the photovoltaic string current, so that regional companies and power generation groups can effectively supervise the management level of photovoltaic power station strings, thereby supervising the photovoltaic power station to improve the abnormal problems of photovoltaic strings.

[0058] The present invention has the following characteristics:

[0059] The present invention can strengthen the monitoring and management of photovoltaic strings by the stations, 2 / 3-level companies and groups by judging the abnormality of photovoltaic power stations and reporting the abnormal strings to 2 / 3-level companies and groups in time.

[0060] By monitoring power stations with abnormal photovoltaic strings, the present invention can improve the photovoltaic field station's attention to abnormal strings and the efficiency of problem handling, thereby increasing the power generation of the photovoltaic power station.

[0061] Embodiment 2

[0062] The photovoltaic power station abnormality judgment system based on strings of the present invention comprises:

[0063] The first judgment module is used to judge abnormal strings in the normal power generation photovoltaic inverter;

[0064] The statistics module is used to count the abnormal string rate of photovoltaic inverters that generate power normally every day;

[0065] The second judgment module is used to judge whether the photovoltaic power station is abnormal according to the abnormal string rate of the photovoltaic inverters that generate normal power every day.

[0066] As an implementation manner of the present invention, the first determination module includes:

[0067] The third judgment module is used to judge whether the photovoltaic inverter in the photovoltaic power station is a normal power generation photovoltaic inverter;

[0068] The summary module is used for collecting the current data of each string under the photovoltaic inverter for normal power generation at preset intervals when the photovoltaic inverter in the photovoltaic power station is a normal power generation photovoltaic inverter, and unifying the current data of the strings collected throughout the day;

[0069] The fourth judgment module is used to consider any string group as an abnormal string group when the all-day current of the string group is constant or the all-day current is less than a preset current value; otherwise, the string group is considered to be a normal string group.

[0070] As an implementation mode of the present invention, the process of judging whether the photovoltaic inverter in the photovoltaic power station is a normal power generation photovoltaic inverter is as follows:

[0071] The power and irradiance data of the photovoltaic inverter are collected at preset intervals, and the power and irradiance data collected within one day are counted. The statistically obtained power and irradiance data are abnormally screened out. When the total number of data after screening out is greater than 1, it indicates that the photovoltaic inverter is a normal power generation photovoltaic inverter.

[0072] The division of modules in the embodiments of the present application is schematic and is only a logical function division. There may be other division methods in actual implementation. In addition, each functional module in each embodiment of the present application may be integrated into a processor, or may exist physically separately, or two or more modules may be integrated into one module. The above-mentioned integrated modules may be implemented in the form of hardware or in the form of software functional modules.

[0073] Embodiment 3

[0074] A computer device comprises a memory, a processor and a computer program stored in the memory and executable on the processor. When the processor executes the computer program, the steps of the photovoltaic power station abnormality judgment method based on strings are implemented, for example, comprising: judging whether the photovoltaic inverter in the photovoltaic power station is a normal power generation photovoltaic inverter; when the photovoltaic inverter in the photovoltaic power station is a normal power generation photovoltaic inverter, collecting the current data of each string under the normal power generation photovoltaic inverter at a preset interval, and unifying the current data of the strings collected throughout the day; when the current of any string is constant throughout the day or the current is less than the preset current value throughout the day, the string is considered to be an abnormal string, otherwise, the string is considered to be a normal string; counting the abnormal string rate of the normal power generation photovoltaic inverter every day; judging whether the photovoltaic power station is abnormal according to the abnormal string rate of the normal power generation photovoltaic inverter every day. The memory may include a memory, such as a high-speed random access memory, and may also include a non-volatile memory, such as at least one disk memory, etc. The processor, network interface, and memory are interconnected through an internal bus, and the internal bus may be an industrial standard architecture bus, a peripheral component interconnection standard bus, an extended industrial standard architecture bus, etc. The bus may be divided into an address bus, a data bus, a control bus, etc. The memory is used to store programs. Specifically, the program may include a program code, and the program code includes computer operation instructions. The memory may include a memory and a non-volatile memory, and provide instructions and data to the processor.

[0075] Embodiment 4

[0076] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the abnormal judgment method of the photovoltaic power station based on the string are implemented, for example, including: judging whether the photovoltaic inverter in the photovoltaic power station is a normal power generation photovoltaic inverter; when the photovoltaic inverter in the photovoltaic power station is a normal power generation photovoltaic inverter, the current data of each string under the normal power generation photovoltaic inverter is collected at a preset interval, and the current data of the strings collected throughout the day are unified; when the all-day current of any string is constant or the all-day current is less than the preset current value, the string is considered to be an abnormal string, otherwise, the string is considered to be a normal string; the abnormal string rate of the normal power generation photovoltaic inverter is counted every day; and whether the photovoltaic power station is abnormal is judged according to the abnormal string rate of the normal power generation photovoltaic inverter every day. Specifically, the computer-readable storage medium includes, but is not limited to, for example, volatile memory and / or non-volatile memory. The volatile memory may include random access memory (RAM) and / or cache memory (cache), etc. The non-volatile memory may include a read-only memory (ROM), a hard disk, a flash memory, an optical disk, a magnetic disk, and the like.

[0077] Those skilled in the art will appreciate that the embodiments of the present application may be provided as methods, systems, or computer program products. Therefore, the present application may adopt the form of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application may adopt the form of a computer program product implemented in one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) that include computer-usable program code.

[0078] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to generate a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0079] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0080] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0081] Those skilled in the art will readily appreciate other embodiments of the present invention after considering the specification and disclosure of the invention. This application is intended to cover any variations, uses or adaptations of the present invention that follow the general principles of the present invention and include common knowledge or customary techniques in the art that are not disclosed by the present invention. The specification and examples are to be considered exemplary only, and the true scope and spirit of the present invention are indicated by the following claims.

[0082] It should be understood that the present invention is not limited to the exact construction that has been described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

[0083] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any way. Any simple modification, change and equivalent structural change made to the above embodiment based on the technical essence of the present invention still falls within the protection scope of the technical solution of the present invention.

Claims

1. A method for judging abnormality of a photovoltaic power station based on strings, characterized in that: include: Determine abnormal strings in normal power generation photovoltaic inverters; Statistics on abnormal string rate of photovoltaic inverters with normal power generation every day; Whether the photovoltaic power station is abnormal is determined based on the abnormal string rate of the photovoltaic inverters that generate normal power every day.

2. The abnormality judgment method of a photovoltaic power station based on strings according to claim 1 is characterized in that: The process of determining abnormal strings in a normal power generation photovoltaic inverter is as follows: Determine whether the photovoltaic inverter in the photovoltaic power station is a normal power generation photovoltaic inverter; When the photovoltaic inverter in the photovoltaic power station is a normal power generation photovoltaic inverter, the current data of each string under the normal power generation photovoltaic inverter is collected at preset intervals, and the current data of the strings collected throughout the day are unified; When the current of any string is constant throughout the day or the current throughout the day is less than the preset current value, the string is considered to be an abnormal string; otherwise, the string is considered to be a normal string.

3. The abnormality judgment method of a photovoltaic power station based on strings according to claim 2 is characterized in that: The process of judging whether the photovoltaic inverter in the photovoltaic power station is a normal power generation photovoltaic inverter is as follows: The power and irradiance data of the photovoltaic inverter are collected at preset intervals, and the power and irradiance data collected within one day are counted. The statistically obtained power and irradiance data are abnormally screened out. When the total number of data after screening out is greater than 1, it indicates that the photovoltaic inverter is a normal power generation photovoltaic inverter.

4. The abnormality judgment method of a photovoltaic power station based on strings according to claim 1 is characterized in that: Abnormal string rate = number of abnormal strings under normal power generation photovoltaic inverter / number of all strings under normal power generation photovoltaic inverter.

5. The abnormality judgment method of a photovoltaic power station based on strings according to claim 1 is characterized in that: The process of judging whether a photovoltaic power station is abnormal based on the abnormal string rate of photovoltaic inverters that generate normal power every day is as follows: When the abnormal string rate is greater than or equal to 1% for a preset number of consecutive days, the photovoltaic power station is considered to be abnormal; otherwise, the photovoltaic power station is considered to be normal.

6. A photovoltaic power station abnormality judgment system based on strings, characterized in that: include: The first judgment module is used to judge abnormal strings in the normal power generation photovoltaic inverter; The statistics module is used to count the abnormal string rate of photovoltaic inverters that generate power normally every day; The second judgment module is used to judge whether the photovoltaic power station is abnormal according to the abnormal string rate of the photovoltaic inverters that generate normal power every day.

7. The abnormality judgment system for photovoltaic power station based on strings according to claim 6 is characterized in that: The first judgment module includes: The third judgment module is used to judge whether the photovoltaic inverter in the photovoltaic power station is a normal power generation photovoltaic inverter; The summary module is used for collecting the current data of each string under the photovoltaic inverter for normal power generation at preset intervals when the photovoltaic inverter in the photovoltaic power station is a normal power generation photovoltaic inverter, and unifying the current data of the strings collected throughout the day; The fourth judgment module is used to consider any string group as an abnormal string group when the all-day current of the string group is constant or the all-day current is less than a preset current value; otherwise, the string group is considered to be a normal string group.

8. The abnormality judgment system for photovoltaic power station based on strings according to claim 7 is characterized in that: The process of judging whether the photovoltaic inverter in the photovoltaic power station is a normal power generation photovoltaic inverter is as follows: The power and irradiance data of the photovoltaic inverter are collected at preset intervals, and the power and irradiance data collected within one day are counted. The statistically obtained power and irradiance data are abnormally screened out. When the total number of data after screening out is greater than 1, it indicates that the photovoltaic inverter is a normal power generation photovoltaic inverter.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the computer program, the steps of the abnormality determination method of a photovoltaic power station based on strings as described in any one of claims 1 to 5 are implemented.

10. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the steps of the abnormality determination method for a photovoltaic power station based on strings as described in any one of claims 1 to 5 are implemented.

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