A method for analyzing the impact of photovoltaic access on power quality and related devices

Abstract

The present application discloses an analysis method and related device for the impact of photovoltaic access on power quality, the method includes: firstly, regularly correlating and interacting the marketing database information, the metering database information and the production database information, so as to achieve data synchronization; then, screening photovoltaic users whose photovoltaic access leads to unqualified voltage quality, photovoltaic users whose photovoltaic access leads to unqualified power factor, and photovoltaic users whose photovoltaic access leads to three-phase imbalance of distribution transformer; finally, generating a report and list of unqualified power quality of public distribution transformer caused by distributed access according to photovoltaic users. Compared with the prior art, the present application realizes a multi-dimensional analysis of unqualified voltage quality, unqualified power factor and three-phase imbalance caused by distributed photovoltaic access, and solves the technical problem that the prior art cannot comprehensively and deeply analyze the reasons for unqualified power quality of public distribution transformer.

Description

Technical Field

[0001] The present application relates to the field of electric power technology, and in particular to a method for analyzing the impact of photovoltaic access on power quality and a related device. Background Art

[0002] As distributed photovoltaics are continuously connected to the power grid, the power quality of the 10kV public distribution transformers in the distribution network will be affected to a certain extent. At present, the analysis of the power quality problems of existing public distribution transformers is mainly divided into voltage quality, power factor, and three-phase imbalance. There is still no technology to conduct in-depth correlation analysis on the power quality problems of public distribution transformers caused by the access of low-voltage industrial or low-voltage residential distributed photovoltaics, and it is impossible to verify whether the power quality of the distribution transformer is unqualified due to distributed photovoltaics.

[0003] Current technical methods can detect simple problems with the power quality of 10kV public distribution transformers, but there is still a lack of an effective method to determine whether there are problems with the power quality of 10kV public distribution transformers caused by distributed photovoltaic access. Therefore, current technology cannot comprehensively and deeply analyze the reasons why all public distribution transformers fail to meet power quality standards. Summary of the invention

[0004] The present application provides a method and related device for analyzing the impact of photovoltaic access on power quality, which are used to solve the technical problem that the prior art cannot comprehensively and deeply analyze the reasons why the public distribution transformer power quality is unsatisfactory.

[0005] In view of this, the first aspect of the present application provides a method for analyzing the impact of photovoltaic access on power quality, the method comprising:

[0006] Regularly associate and interact the marketing database information, measurement database information, and production database information to achieve data synchronization;

[0007] Filter out voltage data that is not within a preset voltage range from the meter code information and obtain the corresponding first distribution transformer ID, calculate the total photovoltaic capacity contained in the first distribution transformer ID, and obtain photovoltaic users whose voltage quality fails due to photovoltaic access based on the total photovoltaic capacity analysis;

[0008] Filter out power factors that are not within a preset power factor range from the meter code information and obtain the corresponding second distribution transformer ID, calculate the total photovoltaic capacity contained in the second distribution transformer ID, and obtain photovoltaic users whose power factors fail to meet the standards due to photovoltaic access based on the total photovoltaic capacity analysis;

[0009] Filter out meter code information with a three-phase imbalance greater than a preset threshold from the meter code information and obtain the corresponding third distribution transformer ID, calculate the total photovoltaic capacity contained in the third distribution transformer ID, and obtain photovoltaic users whose photovoltaic access causes three-phase imbalance of the distribution transformer according to the total photovoltaic capacity analysis;

[0010] A report and list of distributed access resulting in unsatisfactory quality of public distribution and transformation power is generated based on the photovoltaic users.

[0011] Optionally, the periodic association and interaction of the marketing database information, the metering database information, and the production database information to achieve data synchronization specifically includes:

[0012] Using the marketing database information as the base underlying data and the distribution transformer ID as the associated field, the marketing database information and the metering database information are regularly matched for the first time, and the meter code number is used for the second match for the data that cannot be matched;

[0013] Using the production database information as the benchmark underlying data and the distribution transformer ID as the associated field, the metering database information and the production database information are regularly matched for the first time, and the line name or distribution transformer name is used for the second match for the data that cannot be matched.

[0014] Optionally, the step of filtering out voltage data that is not within a preset voltage range from the meter code information and acquiring the corresponding first distribution transformer ID, calculating the total photovoltaic capacity contained in the first distribution transformer ID, and obtaining photovoltaic users whose voltage quality fails due to photovoltaic access according to the total photovoltaic capacity analysis specifically includes:

[0015] Filter out voltage data that is not within a preset voltage range from meter code information and define it as failing voltage quality;

[0016] The distribution transformer capacity, distribution transformer ID and reported capacity are obtained by reverse correlation through the meter code information of unqualified voltage quality. The reported capacity is superimposed to obtain the total photovoltaic capacity of the public distribution transformer connected to the distributed system. Based on the relationship between the total photovoltaic capacity and the distribution transformer capacity, the photovoltaic users whose voltage quality fails due to photovoltaic access are obtained.

[0017] Optionally, the step of filtering out power factors that are not within a preset power factor range from the meter code information and obtaining a corresponding second distribution transformer ID, calculating the total photovoltaic capacity contained in the second distribution transformer ID, and obtaining photovoltaic users whose power factors fail to meet the standards due to photovoltaic access according to the total photovoltaic capacity analysis, specifically includes:

[0018] Filter out the power factors that are not within the preset power factor range from the meter code information and define them as failing power factors;

[0019] Through reverse correlation of the meter code information of power factor failure, the distribution transformer capacity, distribution transformer ID and reported capacity are obtained. The reported capacity is superimposed to obtain the total photovoltaic capacity of the public distribution transformer connected to the distributed system. Based on the relationship between the total photovoltaic capacity and the distribution transformer capacity, the photovoltaic users whose power factor fails due to photovoltaic access are obtained.

[0020] Optionally, the step of selecting meter code information whose three-phase imbalance is greater than a preset threshold from the meter code information and obtaining the corresponding third distribution transformer ID, calculating the total photovoltaic capacity contained in the third distribution transformer ID, and obtaining photovoltaic users whose photovoltaic access causes three-phase imbalance of the distribution transformer according to the total photovoltaic capacity analysis specifically includes:

[0021] Filter out the meter code information with three-phase imbalance greater than a preset threshold from the meter code information and define it as the distribution transformer three-phase imbalance;

[0022] The distribution transformer capacity, distribution transformer ID and reported capacity are obtained by reverse correlation through the table code information of the three-phase imbalance of the distribution transformer. The reported capacity is superimposed to obtain the total photovoltaic capacity of the public distribution transformer connected to the distributed system. According to the relationship between the total photovoltaic capacity and the distribution transformer capacity, the photovoltaic users whose photovoltaic access causes the three-phase imbalance of the distribution transformer are obtained.

[0023] Optionally, the generating of a report and list of distributed access-related failures of public distribution and transformation power quality according to the photovoltaic user specifically includes:

[0024] Generate a public distribution transformer report containing unqualified voltage quality, unqualified power factor and three-phase imbalance and the corresponding power information curve graph.

[0025] Optionally, the public distribution transformer report includes: a list of distributed photovoltaic users and reported capacity of public distribution transformers whose power quality fails to meet standards.

[0026] A second aspect of the present application provides a system for analyzing the impact of photovoltaic access on power quality, the system comprising:

[0027] A synchronization unit is used to regularly associate and interact the marketing database information, the metering database information, and the production database information, thereby achieving data synchronization;

[0028] A first analysis unit is used to filter out voltage data that is not within a preset voltage range from the meter code information and obtain the corresponding first distribution transformer ID, calculate the total photovoltaic capacity contained in the first distribution transformer ID, and obtain photovoltaic users whose voltage quality fails due to photovoltaic access according to the total photovoltaic capacity analysis;

[0029] The second analysis unit is used to filter out power factors that are not within a preset power factor range from the meter code information and obtain the corresponding second distribution transformer ID, calculate the total photovoltaic capacity contained in the second distribution transformer ID, and obtain photovoltaic users whose power factors fail to meet the standards due to photovoltaic access based on the total photovoltaic capacity analysis;

[0030] The third analysis unit is used to filter out meter code information with a three-phase imbalance greater than a preset threshold from the meter code information and obtain the corresponding third distribution transformer ID, calculate the total photovoltaic capacity contained in the third distribution transformer ID, and obtain photovoltaic users whose photovoltaic access causes three-phase imbalance of the distribution transformer according to the total photovoltaic capacity analysis;

[0031] A generating unit is used to generate a report and a list of unsatisfactory quality of public distribution and transformation power caused by distributed access according to the photovoltaic users.

[0032] A third aspect of the present application provides a device for analyzing the impact of photovoltaic access on power quality, the device comprising a processor and a memory:

[0033] The memory is used to store program code and transmit the program code to the processor;

[0034] The processor is used to execute the steps of the method for analyzing the impact of photovoltaic access on power quality as described in the first aspect according to the instructions in the program code.

[0035] A fourth aspect of the present application provides a computer-readable storage medium, wherein the computer-readable storage medium is used to store program code, and the program code is used to execute the method for analyzing the impact of photovoltaic access on power quality described in the first aspect above.

[0036] It can be seen from the above technical solutions that this application has the following advantages:

[0037] The present application provides a method for analyzing the impact of photovoltaic access on power quality, including: regularly associating and interacting marketing database information, metering database information and production database information to achieve data synchronization; filtering out voltage data that is not within a preset voltage range from metering meter code information and obtaining the corresponding first distribution transformer ID, calculating the total photovoltaic capacity contained in the first distribution transformer ID, and obtaining photovoltaic users whose voltage quality fails due to photovoltaic access based on the total photovoltaic capacity analysis; filtering out power factors that are not within a preset power factor range from metering meter code information and obtaining the corresponding second distribution transformer ID, calculating the total photovoltaic capacity contained in the second distribution transformer ID, and obtaining photovoltaic users whose power factor fails due to photovoltaic access based on the total photovoltaic capacity analysis; filtering out meter code information whose three-phase imbalance is greater than a preset threshold from metering meter code information and obtaining the corresponding third distribution transformer ID, calculating the total photovoltaic capacity contained in the third distribution transformer ID, and obtaining photovoltaic users whose three-phase imbalance of the distribution transformer is caused by photovoltaic access based on the total photovoltaic capacity analysis; generating a report and list of distributed access-induced power quality failures for public distribution transformers based on photovoltaic users.

[0038] Compared with the existing technology, this application realizes data interconnection by combining meter code information, marketing photovoltaic user information and production ledger information, and combines the original technical means that can only reveal the unqualified power quality with distributed photovoltaic installation information through the application of intelligent analysis means, so as to realize the multi-dimensional analysis of the unqualified voltage quality, unqualified power factor and three-phase imbalance caused by the distributed photovoltaic access. It solves the technical problem that the existing technology cannot comprehensively and deeply analyze the reasons for the unqualified power quality of public distribution transformers. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 A schematic flow chart of an embodiment of a method for analyzing the impact of photovoltaic access on power quality provided in an embodiment of the present application;

[0040] Figure 2 This is a structural schematic diagram of an embodiment of a system for analyzing the impact of photovoltaic access on power quality provided in an embodiment of the present application. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0042] See also Figure 1 , a method for analyzing the impact of photovoltaic access on power quality provided in an embodiment of the present application includes:

[0043] Step 101: regularly associate and interact with the marketing database information, the measurement database information, and the production database information to achieve data synchronization;

[0044] It should be noted that, in this embodiment, the marketing database information, the metering database information and the production database information are first obtained;

[0045] Among them, the data obtained by the marketing database information include the following from the marketing system's massive database: distributed photovoltaic user number, user name, photovoltaic installed capacity, connected substation, connected 10kV line, connected distribution transformer name, connected distribution transformer ID, meter code number, etc.; the data mainly obtained from the metering database information include the metering return database: the meter code number of the public distribution transformer, the contained electric energy meter data information (including ABC three-phase current information, power factor data, voltage data, time point data, etc.), distribution transformer name, distribution transformer ID, subordinate 10kV line, etc.; the data mainly obtained from the production database information include: substation name, 10kV line name, 10kV line ID, distribution transformer name, distribution transformer ID, distribution transformer capacity, and substation-main transformer-line-distribution transformer topology relationship information, etc.

[0046] The specific process of data synchronization is as follows:

[0047] 1) The marketing database information and the metering database information are used as the main benchmark underlying data, and the distribution transformer ID is used as the main association field for the initial association interaction; for data that cannot be matched in the initial association interaction, the meter code number is used as the secondary association field for secondary interaction association; finally, all successfully associated data are used to realize the association interaction and daily synchronization between the marketing database information and the metering database information;

[0048] 2) The data of the metering database information and the production database information use the production database information as the main benchmark underlying data and the distribution transformer ID as the main association field for the initial association interaction; for the data that cannot be matched in the initial association interaction, the 10kV line name and the distribution transformer name are used as the secondary association fields for the secondary interaction association; finally, all the successfully associated data are used to realize the association interaction and daily synchronization between the metering database information and the production database information;

[0049] 3) Through the above steps, the marketing database information, measurement database information and production database information are interconnected, correlated and interactive, and synchronized once a day to ensure the accuracy and real-time nature of the data.

[0050] Step 102: Filter out voltage data that is not within a preset voltage range from the meter code information and obtain the corresponding first distribution transformer ID, calculate the total photovoltaic capacity contained in the first distribution transformer ID, and obtain photovoltaic users whose voltage quality fails due to photovoltaic access based on the total photovoltaic capacity analysis;

[0051] It should be noted that the analysis steps for voltage quality failure caused by distributed photovoltaic access in this embodiment are as follows:

[0052] 1) By screening and analyzing the voltage data in the meter code information, the voltage point where 235.4V appeared in the meter code is marked as a single point overvoltage, and the voltage point where 198V appeared in the meter code is defined as a single point low voltage;

[0053] 2) The meter code for a single-point overvoltage that lasts for more than 1 hour or 10 times cumulatively is defined as overvoltage; the meter code for a single-point overvoltage that lasts for more than 1 hour or 10 times cumulatively is defined as undervoltage; both overvoltage and undervoltage are reflected as unqualified voltage quality;

[0054] 3) Reversely associate the subordinate substation, 10kV line, public distribution transformer name, distribution transformer capacity, and distribution transformer ID through the table code information of unqualified voltage quality;

[0055] 4) Reversely associate the distributed photovoltaic user name and reported capacity contained in the distribution transformer ID through the meter code information of unqualified voltage quality;

[0056] 5) The installed capacities of distributed photovoltaic users contained in the distribution transformer ID are superimposed to obtain the total capacity of distributed photovoltaic connected to the public distribution transformer. The total capacity of distributed photovoltaic connected to the public distribution transformer is divided by the distribution transformer capacity. If it is greater than 100%, it is defined as the voltage quality failing due to the distributed photovoltaic access.

[0057] Step 103: Filter out power factors that are not within a preset power factor range from the meter code information and obtain the corresponding second distribution transformer ID, calculate the total photovoltaic capacity contained in the second distribution transformer ID, and obtain photovoltaic users whose power factors fail to meet the standards due to photovoltaic access based on the total photovoltaic capacity analysis;

[0058] It should be noted that the analysis steps for power factor failure caused by distributed photovoltaic access in this embodiment are as follows:

[0059] 1) By screening and analyzing the power factor data in the meter code information, the points in the meter code where the power factor is below 0.9 are marked as single point power factor failures;

[0060] 2) The meter code that fails the power factor for more than 1 hour or 10 times at a single point is defined as failing the power factor;

[0061] 3) Reversely correlate the subordinate substation, 10kV line, public distribution transformer name, distribution transformer capacity, and distribution transformer ID through the table code information of power factor failure;

[0062] 4) Reversely associate the distributed photovoltaic user name and reported capacity contained in the distribution transformer ID through the meter code information of the power factor failure;

[0063] 5) The installed capacities of distributed photovoltaic users contained in the distribution transformer ID are superimposed to obtain the total capacity of distributed photovoltaic connected to the public distribution transformer. The total capacity of distributed photovoltaic connected to the public distribution transformer is divided by the distribution transformer capacity. If it is greater than 100%, and the installed capacity of a single user accounts for more than 50% of the total capacity of distributed photovoltaic connected to the distribution transformer, it is defined as a power factor failure caused by distributed photovoltaic access.

[0064] Step 104: Filter out meter code information with a three-phase imbalance greater than a preset threshold from the meter code information and obtain the corresponding third distribution transformer ID, calculate the total photovoltaic capacity contained in the third distribution transformer ID, and obtain photovoltaic users whose photovoltaic access causes three-phase imbalance of the distribution transformer according to the total photovoltaic capacity analysis;

[0065] It should be noted that the steps for analyzing the three-phase imbalance of the distribution transformer caused by the access of distributed photovoltaic power generation in this embodiment are as follows:

[0066] 1) By screening and analyzing the ABC three-phase current data in the meter code information, the current with the largest absolute value among the ABC three-phases at a single point is defined as the maximum phase current value; the current with the smallest absolute value among the ABC three-phases at a single point is defined as the minimum phase current value;

[0067] 2) Introduce the concept of three-phase unbalance: three-phase unbalance = (maximum phase current value - minimum phase current value) / maximum phase current value) * 100%;

[0068] 3) If the meter code shows that the three-phase imbalance is greater than 40% for more than 10 hours per month, it is defined as three-phase imbalance of the distribution transformer;

[0069] 4) Reversely associate the name and reported capacity of the distributed photovoltaic user contained in the distribution transformer ID through the table code information of the three-phase imbalance of the distribution transformer;

[0070] 5) The installed capacities of distributed photovoltaic users contained in the distribution transformer ID are superimposed to obtain the total distributed photovoltaic capacity connected to the public distribution transformer. The total capacity of distributed photovoltaic access to the public distribution transformer is divided by the distribution transformer capacity. If it is greater than 100%, and the maximum phase current value of the three-phase ABC is actually negative for more than 10 hours, it is defined as distributed photovoltaic access causing three-phase imbalance of the distribution transformer.

[0071] Step 105: Generate a report and list of unsatisfactory public distribution and transformation power quality caused by distributed access according to photovoltaic users.

[0072] It should be noted that this embodiment automatically generates the number and specific list of public distribution transformers with unqualified power quality in the city, including three general categories including unqualified voltage quality, unqualified power factor and three-phase imbalance, and generates voltage curves, current curves and power factor curves of 10kV public distribution transformers with three types of problems, as well as a list of distributed photovoltaic users and reported capacity of public distribution transformers with unqualified power quality.

[0073] The above is an embodiment of a method for analyzing the impact of photovoltaic access on power quality provided in an embodiment of the present application. The following is an embodiment of a system for analyzing the impact of photovoltaic access on power quality provided in an embodiment of the present application.

[0074] See also Figure 2 , a system for analyzing the impact of photovoltaic access on power quality provided in an embodiment of the present application includes:

[0075] The synchronization unit 201 is used to regularly associate and interact the marketing database information, the metering database information and the production database information, so as to achieve data synchronization;

[0076] The first analysis unit 202 is used to filter out voltage data that is not within a preset voltage range from the meter code information and obtain the corresponding first distribution transformer ID, calculate the total photovoltaic capacity contained in the first distribution transformer ID, and obtain photovoltaic users whose voltage quality fails due to photovoltaic access according to the total photovoltaic capacity analysis;

[0077] The second analysis unit 203 is used to filter out power factors that are not within a preset power factor range from the meter code information and obtain the corresponding second distribution transformer ID, calculate the total photovoltaic capacity contained in the second distribution transformer ID, and obtain photovoltaic users whose power factors fail to meet the standards due to photovoltaic access based on the total photovoltaic capacity analysis;

[0078] The third analysis unit 204 is used to filter out meter code information with a three-phase imbalance greater than a preset threshold from the meter code information and obtain the corresponding third distribution transformer ID, calculate the total photovoltaic capacity contained in the third distribution transformer ID, and obtain photovoltaic users whose photovoltaic access causes three-phase imbalance of the distribution transformer according to the total photovoltaic capacity analysis;

[0079] The generating unit 205 is used to generate a report and a list of the unsatisfactory quality of the public distribution and transformation power caused by the distributed access according to the photovoltaic users.

[0080] Furthermore, an analysis device for the impact of photovoltaic access on power quality is provided in an embodiment of the present application, and the device includes a processor and a memory:

[0081] The memory is used to store program code and transmit the program code to the processor;

[0082] The processor is used to execute the method for analyzing the impact of photovoltaic access on power quality described in the above method embodiment according to the instructions in the program code.

[0083] Furthermore, a computer-readable storage medium is provided in an embodiment of the present application, and the computer-readable storage medium is used to store program code, and the program code is used to execute the analysis method of the impact of photovoltaic access on power quality described in the above method embodiment.

[0084] Those skilled in the art can clearly understand that, for the convenience and brevity of description, the specific working processes of the systems and units described above can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here.

[0085] The terms "first", "second", "third", "fourth", etc. in the specification of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than those illustrated or described herein, for example. In addition, the terms "including" and "having" and any of their variations are intended to cover non-exclusive inclusions, for example, a process, method, system, product or device comprising a series of steps or units is not necessarily limited to those steps or units clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0086] It should be understood that in the present application, "at least one (item)" means one or more, and "plurality" means two or more. "And / or" is used to describe the association relationship of associated objects, indicating that three relationships may exist. For example, "A and / or B" can mean: only A exists, only B exists, and A and B exist at the same time, where A and B can be singular or plural. The character " / " generally indicates that the objects associated before and after are in an "or" relationship. "At least one of the following" or similar expressions refers to any combination of these items, including any combination of single or plural items. For example, at least one of a, b or c can mean: a, b, c, "a and b", "a and c", "b and c", or "a and b and c", where a, b, c can be single or multiple.

[0087] In the several embodiments provided in the present application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, which can be electrical, mechanical or other forms.

[0088] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0089] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0090] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions to enable a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (full name in English: Read-Only Memory, English abbreviation: ROM), random access memory (full name in English: Random Access Memory, English abbreviation: RAM), disk or optical disk and other media that can store program codes.

[0091] As described above, the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A method for analyzing the impact of photovoltaic access on power quality, characterized in that: include: Regularly associate and interact the marketing database information, measurement database information, and production database information to achieve data synchronization; Filter out voltage data that is not within a preset voltage range from the meter code information and obtain the corresponding first distribution transformer ID, calculate the total photovoltaic capacity contained in the first distribution transformer ID, and obtain photovoltaic users whose voltage quality fails due to photovoltaic access based on the total photovoltaic capacity analysis; Filter out power factors that are not within a preset power factor range from the meter code information and obtain the corresponding second distribution transformer ID, calculate the total photovoltaic capacity contained in the second distribution transformer ID, and obtain photovoltaic users whose power factors fail to meet the standards due to photovoltaic access based on the total photovoltaic capacity analysis; Filter out meter code information with a three-phase imbalance greater than a preset threshold from the meter code information and obtain the corresponding third distribution transformer ID, calculate the total photovoltaic capacity contained in the third distribution transformer ID, and obtain photovoltaic users whose photovoltaic access causes three-phase imbalance of the distribution transformer according to the total photovoltaic capacity analysis; Generate reports and lists of distributed access resulting in unsatisfactory quality of public distribution and transformation power according to the photovoltaic users; in: The photovoltaic users whose photovoltaic access results in unsatisfactory voltage quality according to the analysis of the total photovoltaic capacity include: 1) By screening and analyzing the voltage data in the meter code information, the voltage point where 235.4V appeared in the meter code is marked as a single point overvoltage, and the voltage point where 198V appeared in the meter code is defined as a single point low voltage; 2) The meter code for a single-point overvoltage that lasts for more than 1 hour or 10 times cumulatively is defined as overvoltage; the meter code for a single-point undervoltage that lasts for more than 1 hour or 10 times cumulatively is defined as undervoltage; both overvoltage and undervoltage are reflected as unqualified voltage quality; 3) Reversely associate the subordinate substation, 10kV line, public distribution transformer name, distribution transformer capacity, and distribution transformer ID through the meter code information of unqualified voltage quality; 4) Reversely associate the distributed photovoltaic user name and reported capacity contained in the distribution transformer ID through the meter code information of unqualified voltage quality; 5) Add the installed capacity of distributed photovoltaic users contained in the distribution transformer ID to obtain the total capacity of distributed photovoltaic connected to the public distribution transformer. Divide the total capacity of distributed photovoltaic connected to the public distribution transformer by the distribution transformer capacity. If it is greater than 100%, it is defined as the voltage quality failing due to the distributed photovoltaic connection; The photovoltaic users whose photovoltaic access results in a power factor failure according to the analysis of the total photovoltaic capacity include: 1) By screening and analyzing the power factor data in the meter code information, the points in the meter code where the power factor is below 0.9 are marked as single point power factor failures; 2) The meter code that fails the power factor for more than 1 hour or 10 times at a single point is defined as failing the power factor; 3) Reversely correlate the subordinate substation, 10kV line, public distribution transformer name, distribution transformer capacity, and distribution transformer ID through the meter code information of power factor failure; 4) Reversely associate the distributed photovoltaic user name and reported capacity contained in the distribution transformer ID through the meter code information of the power factor failure; 5) Add the installed capacity of distributed photovoltaic users contained in the distribution transformer ID to obtain the total capacity of distributed photovoltaic connected to the public distribution transformer. Divide the total capacity of distributed photovoltaic connected to the public distribution transformer by the distribution transformer capacity. If it is greater than 100%, and the installed capacity of a single user accounts for more than 50% of the total capacity of distributed photovoltaic connected to the distribution transformer, it is defined as a power factor failure caused by distributed photovoltaic access; The photovoltaic users whose photovoltaic access leads to three-phase imbalance of distribution transformers according to the analysis of the total photovoltaic capacity include: 1) By screening and analyzing the ABC three-phase current data in the meter code information, the current with the largest absolute value among the ABC three-phases at a single point is defined as the maximum phase current value; the current with the smallest absolute value among the ABC three-phases at a single point is defined as the minimum phase current value; 2) Introduce the concept of three-phase unbalance: three-phase unbalance = (maximum phase current value - minimum phase current value) / maximum phase current value) * 100%; 3) If the meter code shows that the three-phase imbalance is greater than 40% for more than 10 hours per month, it is defined as three-phase imbalance of the distribution transformer; 4) Reversely associate the name and reported capacity of the distributed photovoltaic user contained in the distribution transformer ID through the table code information of the three-phase imbalance of the distribution transformer; 5) Add the installed capacities of distributed photovoltaic users contained in the distribution transformer ID to obtain the total capacity of distributed photovoltaic connected to the public distribution transformer. Divide the total capacity of distributed photovoltaic connected to the public distribution transformer by the distribution transformer capacity. If it is greater than 100%, and the maximum phase current value of the three-phase ABC is actually negative for more than 10 hours, it is defined as distributed photovoltaic access causing three-phase imbalance of the distribution transformer.

2. The method for analyzing the impact of photovoltaic access on power quality according to claim 1 is characterized in that: The periodic association and interaction of the marketing database information, the metering database information and the production database information to achieve data synchronization specifically includes: Using the marketing database information as the base underlying data and the distribution transformer ID as the associated field, the marketing database information and the metering database information are regularly matched for the first time, and the meter code number is used for the second match for the data that cannot be matched; Using the production database information as the benchmark underlying data and the distribution transformer ID as the associated field, the metering database information and the production database information are regularly matched for the first time, and the line name or distribution transformer name is used for the second match for the data that cannot be matched.

3. The method for analyzing the impact of photovoltaic access on power quality according to claim 1 is characterized in that: The step of filtering out voltage data that is not within a preset voltage range from the meter code information and obtaining the corresponding first distribution transformer ID, and calculating the total photovoltaic capacity contained in the first distribution transformer ID, specifically includes: Filter out voltage data that is not within a preset voltage range from meter code information and define it as failing voltage quality; The distribution transformer capacity, distribution transformer ID and reported capacity are obtained by reverse correlation through the meter code information of unqualified voltage quality. The reported capacity is superimposed to obtain the total photovoltaic capacity of the public distribution transformer connected to the distributed system.

4. The method for analyzing the impact of photovoltaic access on power quality according to claim 1 is characterized in that: The step of selecting power factors that are not within a preset power factor range from the meter code information and obtaining the corresponding second distribution transformer ID, and calculating the total photovoltaic capacity contained in the second distribution transformer ID specifically includes: Filter out the power factors that are not within the preset power factor range from the meter code information and define them as failing power factors; The distribution transformer capacity, distribution transformer ID and reported capacity are obtained by reverse correlation through the meter code information of power factor failure. The reported capacity is superimposed to obtain the total photovoltaic capacity of the public distribution transformer connected to the distributed system.

5. The method for analyzing the impact of photovoltaic access on power quality according to claim 1 is characterized in that: The step of selecting meter code information whose three-phase imbalance is greater than a preset threshold from the meter code information and obtaining the corresponding third distribution transformer ID, and calculating the total photovoltaic capacity contained in the third distribution transformer ID, specifically includes: Filter out the meter code information with three-phase imbalance greater than a preset threshold from the meter code information and define it as the distribution transformer three-phase imbalance; The distribution transformer capacity, distribution transformer ID and reported capacity are obtained by reverse correlation through the meter code information of the three-phase imbalance of the distribution transformer. The reported capacity is superimposed to obtain the total photovoltaic capacity of the public distribution transformer connected to the distributed system.

6. The method for analyzing the impact of photovoltaic access on power quality according to claim 1 is characterized in that: The report and list generated by the photovoltaic user for distributed access resulting in unsatisfactory quality of public distribution and transformation power specifically include: Generate a public distribution transformer report containing unqualified voltage quality, unqualified power factor and three-phase imbalance and the corresponding power information curve graph.

7. The method for analyzing the impact of photovoltaic access on power quality according to claim 6, characterized in that: The public distribution transformer report includes: a list of distributed photovoltaic users and reported capacity of public distribution transformers whose power quality fails to meet standards.

8. An analysis system for the impact of photovoltaic access on power quality, characterized in that: include: A synchronization unit is used to regularly associate and interact the marketing database information, the metering database information, and the production database information, thereby achieving data synchronization; A first analysis unit is used to filter out voltage data that is not within a preset voltage range from the meter code information and obtain the corresponding first distribution transformer ID, calculate the total photovoltaic capacity contained in the first distribution transformer ID, and obtain photovoltaic users whose voltage quality fails due to photovoltaic access according to the total photovoltaic capacity analysis; The second analysis unit is used to filter out power factors that are not within a preset power factor range from the meter code information and obtain the corresponding second distribution transformer ID, calculate the total photovoltaic capacity contained in the second distribution transformer ID, and obtain photovoltaic users whose power factors fail to meet the standards due to photovoltaic access based on the total photovoltaic capacity analysis; The third analysis unit is used to filter out meter code information with a three-phase imbalance greater than a preset threshold from the meter code information and obtain the corresponding third distribution transformer ID, calculate the total photovoltaic capacity contained in the third distribution transformer ID, and obtain photovoltaic users whose photovoltaic access causes three-phase imbalance of the distribution transformer according to the total photovoltaic capacity analysis; A generating unit, for generating a report and a list of unsatisfactory quality of public distribution and transformation power caused by distributed access according to the photovoltaic user; in: The photovoltaic users whose photovoltaic access results in unsatisfactory voltage quality according to the analysis of the total photovoltaic capacity include: 1) By screening and analyzing the voltage data in the meter code information, the voltage point where 235.4V appeared in the meter code is marked as a single point overvoltage, and the voltage point where 198V appeared in the meter code is defined as a single point low voltage; 2) The meter code for a single-point overvoltage that lasts for more than 1 hour or 10 times cumulatively is defined as overvoltage; the meter code for a single-point undervoltage that lasts for more than 1 hour or 10 times cumulatively is defined as undervoltage; both overvoltage and undervoltage are reflected as unqualified voltage quality; 3) Reversely associate the subordinate substation, 10kV line, public distribution transformer name, distribution transformer capacity, and distribution transformer ID through the meter code information of unqualified voltage quality; 4) Reversely associate the distributed photovoltaic user name and reported capacity contained in the distribution transformer ID through the meter code information of unqualified voltage quality; 5) Add the installed capacity of distributed photovoltaic users contained in the distribution transformer ID to obtain the total capacity of distributed photovoltaic connected to the public distribution transformer. Divide the total capacity of distributed photovoltaic connected to the public distribution transformer by the distribution transformer capacity. If it is greater than 100%, it is defined as the voltage quality failing due to the distributed photovoltaic connection; The photovoltaic users whose photovoltaic access results in a power factor failure according to the analysis of the total photovoltaic capacity include: 1) By screening and analyzing the power factor data in the meter code information, the points in the meter code where the power factor is below 0.9 are marked as single point power factor failures; 2) The meter code that fails the power factor for more than 1 hour or 10 times at a single point is defined as failing the power factor; 3) Reversely correlate the subordinate substation, 10kV line, public distribution transformer name, distribution transformer capacity, and distribution transformer ID through the meter code information of power factor failure; 4) Reversely associate the distributed photovoltaic user name and reported capacity contained in the distribution transformer ID through the meter code information of the power factor failure; 5) Add the installed capacity of distributed photovoltaic users contained in the distribution transformer ID to obtain the total capacity of distributed photovoltaic connected to the public distribution transformer. Divide the total capacity of distributed photovoltaic connected to the public distribution transformer by the distribution transformer capacity. If it is greater than 100%, and the installed capacity of a single user accounts for more than 50% of the total capacity of distributed photovoltaic connected to the distribution transformer, it is defined as a power factor failure caused by distributed photovoltaic access; The photovoltaic users whose photovoltaic access leads to three-phase imbalance of distribution transformers according to the analysis of the total photovoltaic capacity include: 1) By screening and analyzing the ABC three-phase current data in the meter code information, the current with the largest absolute value among the ABC three-phases at a single point is defined as the maximum phase current value; the current with the smallest absolute value among the ABC three-phases at a single point is defined as the minimum phase current value; 2) Introduce the concept of three-phase unbalance: three-phase unbalance = (maximum phase current value - minimum phase current value) / maximum phase current value) * 100%; 3) If the meter code shows that the three-phase imbalance is greater than 40% for more than 10 hours per month, it is defined as three-phase imbalance of the distribution transformer; 4) Reversely associate the name and reported capacity of the distributed photovoltaic user contained in the distribution transformer ID through the table code information of the three-phase imbalance of the distribution transformer; 5) Add the installed capacities of distributed photovoltaic users contained in the distribution transformer ID to obtain the total capacity of distributed photovoltaic connected to the public distribution transformer. Divide the total capacity of distributed photovoltaic connected to the public distribution transformer by the distribution transformer capacity. If it is greater than 100%, and the maximum phase current value of the three-phase ABC is actually negative for more than 10 hours, it is defined as distributed photovoltaic access causing three-phase imbalance of the distribution transformer.

9. An analysis device for the impact of photovoltaic access on power quality, characterized in that: The device comprises a processor and a memory: The memory is used to store program code and transmit the program code to the processor; The processor is used to execute the method for analyzing the impact of photovoltaic access on power quality according to any one of claims 1-7 according to the instructions in the program code.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium is used to store program codes, and the program codes are used to execute the method for analyzing the impact of photovoltaic access on power quality as described in any one of claims 1-7.

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