CN114884095B - Method and system for analyzing annual maximum current of distribution network line caused by photovoltaic return - Google Patents

Method and system for analyzing annual maximum current of distribution network line caused by photovoltaic return Download PDF

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CN114884095B
CN114884095B CN202210815272.1A CN202210815272A CN114884095B CN 114884095 B CN114884095 B CN 114884095B CN 202210815272 A CN202210815272 A CN 202210815272A CN 114884095 B CN114884095 B CN 114884095B
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line
maximum current
annual maximum
photovoltaic
annual
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CN114884095A (en
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邝梓佳
邱桂华
汤志锐
周俊宇
区伟潮
吴树鸿
何引生
宋永禄
肖再丰
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Foshan Power Supply Bureau of Guangdong Power Grid Corp
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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
    • H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
    • 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
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
    • 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
    • H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
    • H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
    • 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
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers
    • 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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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Remote Monitoring And Control Of Power-Distribution Networks (AREA)
  • Management, Administration, Business Operations System, And Electronic Commerce (AREA)

Abstract

The invention discloses a method and a system for analyzing annual maximum current of a distribution network line caused by photovoltaic feedback, and relates to the technical field of power data analysis of a distribution network. The technical problem that the annual maximum current analysis of the 10kV line of the power distribution network cannot accurately analyze whether the reason of the annual maximum current of the 10kV line is caused by photovoltaic return to the power distribution network or not, and the operation management and safe and reliable operation of the power distribution network are influenced is solved.

Description

Annual maximum current analysis method and system for distribution network lines caused by photovoltaic return
Technical Field
The invention relates to the technical field of power distribution network power data analysis, in particular to a method and a system for analyzing annual maximum current of a distribution network line caused by photovoltaic return.
Background
With the reduction of the overall installation cost of the photovoltaic caused by the scale effect of the photovoltaic, the distributed photovoltaic shows explosive growth in recent years, and great influence is formed on the equipment operation and maintenance and operation management of the power distribution network. In the past, the reason for annual maximum current of a 10kV line of a power distribution network is from natural increase of load, but active power flows backwards along with returning of distributed photovoltaic access to the network, and part of annual maximum current of the 10kV line of the power distribution network is caused by returning of photovoltaic to the power grid, so that the active power flowing backwards caused by returning of photovoltaic to the network affects the whole distribution network scheduling, distribution network operation management and power grid planning.
At present, the annual maximum current of a 10kV line of a power distribution network is mined and statistically analyzed by means of current collection of a power outlet gateway ammeter of the 10kV line of a transformer substation, but the current can only present a numerical value, so that the current can not clearly know whether the current flows in the forward direction or in the reverse direction, and the annual maximum current of the 10kV line is not known to be caused by forward flowing of active power of a load or backward flowing of active power of photovoltaic internet access. The reason that the annual maximum current of the 10kV line cannot be accurately analyzed is that the whole power distribution network cannot be transparent, so that the load characteristic analysis of the 10kV line of the power distribution network is influenced, and the operation and maintenance, planning investment and safe and reliable operation of power distribution network equipment are influenced.
Disclosure of Invention
The invention provides a method and a system for analyzing annual maximum current of a distribution network line caused by photovoltaic return, which are used for solving the technical problems that the annual maximum current of the 10kV line of the existing distribution network depends on current collection of a 10kV line outlet gateway ammeter of a transformer substation, and whether the reason of annual maximum current of the 10kV line is caused by photovoltaic return to a power grid or not can not be accurately analyzed, so that the operation management and safe and reliable operation of the distribution network are influenced.
In view of this, a first aspect of the present invention provides a method for analyzing an annual maximum current of a distribution network line caused by photovoltaic foldback, including:
acquiring distribution network marketing account information and production equipment information, wherein the marketing account information comprises 10kV line photovoltaic installation capacity, 10kV line names and 10kV line numbers of photovoltaic users, and the production equipment information comprises 10kV line names, 10kV line numbers, 10kV line topology subordinate district offices and 10kV line topology subordinate power supply stations;
associating marketing standing book information and production equipment information by using a 10kV line number to obtain first data;
acquiring distribution network production operation data and 10kV line annual maximum current counted by a 10kV line outlet meter and 10kV line annual maximum current time, wherein the production operation data comprises 10kV line current-carrying capacity, 10kV line name and 10kV line number, and the 10kV line annual maximum current counted by the 10kV line outlet meter and the 10kV line annual maximum current time are associated with the 10kV line number;
correlating the production operation data, the annual maximum current of the 10kV line and the annual maximum current time of the 10kV line by using the serial number of the 10kV line to obtain second data;
acquiring third data, wherein the third data are a 10kV line list of an active power meter, a 10kV line list of a non-power meter and daily power meter data of 10kV lines of the active power meter, and the 10kV line list of the active power meter and the 10kV line list of the non-power meter contain 10kV line numbers of each 10kV line;
associating the first data, the second data and the third data by taking the serial number of the 10kV line as a key field;
calculating the photovoltaic permeability of the 10kV line according to the current-carrying capacity of the 10kV line and the photovoltaic loading capacity of the 10kV line;
determining 10kV lines of a 10kV line outgoing active power table according to a 10kV line list of the active power table, and judging whether the annual maximum current of the 10kV lines of the 10kV line outgoing active power table is caused by photovoltaic active power feedback or not according to daily power meter data corresponding to the annual maximum current time of the 10kV lines and the annual maximum current time of the 10kV lines;
determining a 10kV line of a 10kV line outgoing powerless meter according to a 10kV line list of the powerless meter, and judging whether the annual maximum current of the 10kV line outgoing powerless meter of the 10kV line is caused by photovoltaic active power feedback or not according to daily power meter data corresponding to the photovoltaic permeability of the 10kV line, the annual maximum current time of the 10kV line and the annual maximum current time of the 10kV line;
respectively counting 10kV line lists caused by photovoltaic active power feedback corresponding to a 10kV line outgoing active power table and a no-power table, and respectively outputting the 10kV line lists caused by photovoltaic active power feedback according to a preset counting chart by using a 10kV line topology subordinate region and a 10kV line topology subordinate power supply station.
Optionally, for a 10kV line of the 10kV line outgoing active power meter, according to the annual maximum current time of the 10kV line and the annual maximum current time power meter data of the 10kV line, determining whether the annual maximum current of the 10kV line is caused by the photovoltaic active power feedback includes:
for a 10kV line of a 10kV line outgoing active power meter, judging whether the annual maximum current time of the 10kV line is 07 to 18 within the period of 00, whether the annual maximum current time of the 10kV line is negative and whether 4 integral point power meter data before and after the annual maximum current time of the 10kV line are changed, if so, judging that the annual maximum current of the 10kV line is caused by photovoltaic active power feedback, and otherwise, judging that the annual maximum current of the 10kV line is not caused by photovoltaic active power feedback.
Optionally, for a 10kV line of a 10kV line outgoing powerless meter, according to the 10kV line photovoltaic permeability, the 10kV line annual maximum current time and the 10kV line annual maximum current time power meter data, determining whether the 10kV line annual maximum current is caused by photovoltaic active power feedback, includes:
for a 10kV line of a 10kV line outgoing line powerless meter, judging whether the photovoltaic permeability of the 10kV line is more than 40%, whether the annual maximum current time of the 10kV line is within a range of 07 to 18, whether the annual maximum current time of the 10kV line is 0-6 and whether the annual maximum current time of 18-24 is all more than 50% of the annual maximum current of the 10kV line, and judging whether the annual maximum current curve of the 10kV line, which is drawn by taking 15 minutes as 1 point, is in arch distribution within a range of 07 to 18 within a range of 10kV line annual maximum current day, if yes, judging that the annual maximum current of the 10kV line is caused by photovoltaic active power feedback, otherwise, judging that the annual maximum current of the 10kV line is not caused by photovoltaic active power feedback, wherein the annual maximum current day of the 10kV line is the day corresponding to the annual maximum current.
Optionally, the method further comprises the step of correlating the production operation data, the annual maximum current of the 10kV line, and the annual maximum current time of the 10kV line with a 10kV line number to obtain second data, and the method further comprises the steps of:
calculating the annual maximum load rate of the 10kV line according to the annual maximum current of the 10kV line and the current-carrying capacity of the 10kV line, wherein the annual maximum load rate of the 10kV line is calculated by the following formula:
Figure 60660DEST_PATH_IMAGE001
wherein, the first and the second end of the pipe are connected with each other,Fis the annual highest load rate of a 10kV line,
Figure 672907DEST_PATH_IMAGE002
is the maximum annual current of a 10kV line,
Figure 85433DEST_PATH_IMAGE003
the current-carrying capacity of the 10kV line is obtained;
correspondingly, the annual highest load rate of the 10kV line is associated to the second data, and when a 10kV line list caused by photovoltaic active power return is output according to a preset statistical chart by a 10kV line topology subordinate district and a 10kV line topology subordinate power supply station, the information of the preset statistical chart comprises the annual highest load rate of the 10kV line.
Optionally, the calculation formula of the photovoltaic permeability of the 10kV line is:
Figure 175749DEST_PATH_IMAGE004
Figure 154069DEST_PATH_IMAGE005
wherein the content of the first and second substances,Ris the photovoltaic permeability of a 10kV line,
Figure 343742DEST_PATH_IMAGE003
is the current-carrying capacity of a 10kV line,
Figure 571461DEST_PATH_IMAGE006
is the photovoltaic installation capacity of a 10kV line,
Figure 137572DEST_PATH_IMAGE007
the maximum allowable capacity of a 10kV line.
The invention also provides a system for analyzing annual maximum current of a distribution network line caused by photovoltaic return, which comprises a photovoltaic ledger data analysis module, a 10kV line annual maximum current analysis module, a photovoltaic active power return intelligent analysis module and a system output module;
photovoltaic standing book data analysis module is used for:
acquiring distribution network marketing account information and production equipment information, wherein the marketing account information comprises 10kV line photovoltaic installation capacity, 10kV line names and 10kV line numbers of photovoltaic users, and the production equipment information comprises 10kV line names, 10kV line numbers, 10kV line topology subordinate district offices and 10kV line topology subordinate power supply stations;
associating marketing standing book information and production equipment information by using a 10kV line number to obtain first data;
the annual maximum current analysis module of the 10kV line is used for:
acquiring distribution network production operation data and 10kV line annual maximum current counted by a 10kV line outlet meter and 10kV line annual maximum current time, wherein the production operation data comprises 10kV line current-carrying capacity, 10kV line name and 10kV line number, and the 10kV line annual maximum current counted by the 10kV line outlet meter and the 10kV line annual maximum current time are associated with the 10kV line number;
correlating the production operation data, the annual maximum current of the 10kV line and the annual maximum current time of the 10kV line by using the serial number of the 10kV line to obtain second data;
photovoltaic active power sends back intelligent analysis module and is used for:
obtaining third data, wherein the third data are a 10kV line list of an active power meter, a 10kV line list of a non-power meter and daily power meter data of 10kV lines of the active power meter, and the 10kV line list of the active power meter and the 10kV line list of the non-power meter contain 10kV line numbers of each 10kV line;
associating the first data, the second data and the third data by taking the number of the 10kV line as a key field;
calculating the photovoltaic permeability of the 10kV line according to the current-carrying capacity of the 10kV line and the photovoltaic loading capacity of the 10kV line;
determining 10kV lines of a 10kV line outgoing active power table according to a 10kV line list of the active power table, and judging whether annual maximum current of the 10kV lines of the 10kV line outgoing active power table is caused by photovoltaic active power feedback or not according to daily power meter data corresponding to annual maximum current time of the 10kV lines and annual maximum current time of the 10kV lines;
determining a 10kV line of a 10kV line outgoing powerless meter according to a 10kV line list of the powerless meter, and judging whether the annual maximum current of the 10kV line outgoing line powerless meter is caused by the return of photovoltaic active power or not according to daily power meter data corresponding to the photovoltaic permeability of the 10kV line, the annual maximum current time of the 10kV line and the annual maximum current time of the 10kV line;
the system output module is used for:
respectively counting 10kV line lists caused by photovoltaic active power feedback corresponding to a 10kV line outgoing active power table and a no-power table, and respectively outputting the 10kV line lists caused by photovoltaic active power feedback according to a preset counting chart by using a 10kV line topology subordinate region and a 10kV line topology subordinate power supply station.
Optionally, for a 10kV line of the 10kV line outgoing active power meter, according to the annual maximum current time of the 10kV line and the annual maximum current time power meter data of the 10kV line, determining whether the annual maximum current of the 10kV line is caused by the photovoltaic active power feedback includes:
for a 10kV line of a 10kV line outgoing active power meter, judging whether the annual maximum current time of the 10kV line is 07 to 18 within the period of 00, whether the annual maximum current time of the 10kV line is negative and whether 4 integral point power meter data before and after the annual maximum current time of the 10kV line are changed, if so, judging that the annual maximum current of the 10kV line is caused by photovoltaic active power feedback, and otherwise, judging that the annual maximum current of the 10kV line is not caused by photovoltaic active power feedback;
for a 10kV line of a 10kV line outgoing powerless meter, judging whether annual maximum current of the 10kV line is caused by photovoltaic active power feedback or not according to photovoltaic permeability of the 10kV line, annual maximum current time of the 10kV line and annual maximum current time power meter data of the 10kV line, and the method comprises the following steps:
for a 10kV line of a 10kV line outgoing powerless meter, judging whether the photovoltaic permeability of the 10kV line is more than 40%, whether the annual maximum current time of the 10kV line is 07 to 18 within a period of 00 to 10, whether the annual maximum current of the 10kV line is 0 to 6 points within a period of 10kV line, and whether the annual maximum current of 18 to 24 points is more than 50% of the annual maximum current of the 10kV line, and whether a 10kV line current curve drawn by taking 15 minutes as 1 point within a period of 10kV line within a period of 07 to 18 within a period of 00.
Optionally, the 10kV line year maximum current analysis module is further configured to:
calculating the annual maximum load rate of the 10kV line according to the annual maximum current of the 10kV line and the current-carrying capacity of the 10kV line, wherein the annual maximum load rate of the 10kV line is calculated according to the following formula:
Figure 501557DEST_PATH_IMAGE001
wherein the content of the first and second substances,Fis the annual highest load rate of a 10kV line,
Figure 862131DEST_PATH_IMAGE002
is the maximum annual current of a 10kV line,
Figure 311567DEST_PATH_IMAGE003
the current carrying capacity is 10kV line current carrying capacity;
correspondingly, the annual highest load rate of the 10kV line is associated to the second data, and when the system output module outputs a 10kV line list caused by photovoltaic active power return according to a preset statistical chart by using a 10kV line topology subordinate district and a 10kV line topology subordinate power supply station, the information of the preset statistical chart comprises the annual highest load rate of the 10kV line.
Optionally, the calculation formula of the photovoltaic permeability of the 10kV line is:
Figure 743685DEST_PATH_IMAGE004
Figure 634281DEST_PATH_IMAGE005
wherein, the first and the second end of the pipe are connected with each other,Ris the photovoltaic permeability of a 10kV line,
Figure 228073DEST_PATH_IMAGE003
is the current-carrying capacity of a 10kV line,
Figure 836909DEST_PATH_IMAGE006
is the photovoltaic installation capacity of a 10kV line,
Figure 361735DEST_PATH_IMAGE007
the maximum allowable capacity of the 10kV line.
According to the technical scheme, the annual maximum current analysis method and system for the distribution network lines caused by photovoltaic return have the following advantages:
according to the method for analyzing the annual maximum current of the distribution network lines caused by photovoltaic return, which is provided by the invention, distribution network marketing account information, production equipment information, production operation data, a 10kV line list of an active power meter and daily power meter data are obtained, correlation and calculation are carried out on the obtained data, 10kV line annual maximum current, 10kV line annual maximum load rate and 10kV line photovoltaic permeability are obtained, then judgment of whether the annual maximum current of the 10kV lines is photovoltaic active power return or not is respectively carried out on the 10kV lines of the 10kV line outgoing active power meter and the 10kV lines of the 10kV line outgoing powerless meter, a technical blank of the cause of the annual maximum current of the 10kV lines with distributed photovoltaic access is filled, whether the annual maximum current of the 10kV lines is generated by photovoltaic active power return or not is accurately judged, safe and reliable operation of a power grid is guaranteed, 10kV line load characteristic analysis is realized, powerful support is provided for equipment operation and maintenance planning, and the problems that the annual maximum current analysis of the 10kV lines of a transformer substation depends on current collection of a 10kV line gateway of the photovoltaic active power return, the annual maximum current analysis of the 10kV lines is not accurately managed, and even the problem of the safe operation of the annual maximum current management of the distribution network is solved, and the problem that the annual maximum current of the photovoltaic return of the power distribution network is caused by the safe operation of the photovoltaic return of the photovoltaic line management of the power distribution network.
The annual maximum current analysis system of the distribution network line caused by photovoltaic foldback provided by the invention is used for executing the annual maximum current analysis method of the distribution network line caused by photovoltaic foldback provided by the invention, and the obtained technical effect is the same as the annual maximum current analysis method of the distribution network line caused by photovoltaic foldback provided by the invention, and the description is not repeated herein.
Drawings
In order to clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other relevant drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic flow chart of a method for analyzing annual maximum current of a distribution network line caused by photovoltaic foldback provided in the present invention;
fig. 2 is a logic architecture diagram of a method for analyzing annual maximum current of a distribution network line caused by photovoltaic foldback provided in the present invention;
fig. 3 is a schematic structural diagram of a system for analyzing annual maximum current of a distribution network line caused by photovoltaic foldback according to the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and 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.
For convenience of understanding, please refer to fig. 1 and fig. 2, an embodiment of a method for analyzing annual maximum current of a distribution network line due to photovoltaic foldback is provided in the present invention, including:
step 101, acquiring distribution network marketing account information and production equipment information.
It should be noted that the marketing ledger information obtained in the embodiment of the present invention includes a photovoltaic installation capacity of a 10kV line, a 10kV line name and a 10kV line number of a photovoltaic user, and the production equipment information includes a photovoltaic user name, a photovoltaic user number, a 10kV line name, a 10kV line number, a 10kV line topology slave substation, a 10kV line topology slave station, and a 10kV line topology slave power supply station. The production equipment information may also include a 10kV line topology slave bus. Marketing standing book information can be obtained by establishing a data interface with a distribution network marketing standing book system, photovoltaic users belonging to the same 10kV line can be automatically classified after the marketing standing book information is obtained, and the 10kV line photovoltaic loading capacity can be obtained by superposing the loading capacities of the same 10kV line photovoltaic users (the same 10kV line photovoltaic users can be determined through photovoltaic user names and photovoltaic user numbers). The production equipment information can be obtained by establishing a data interface with a production equipment system which is a subsystem of the distribution network production management system.
And 102, associating marketing standing book information and production equipment information by using the 10kV line number to obtain first data.
It should be noted that after the marketing standing book information and the production equipment information are obtained, the marketing standing book information and the production equipment information need to be associated, specifically, the marketing standing book information and the production equipment information are associated by a 10kV line number, so as to obtain the first data. Namely, the first data comprises a 10kV line name, a 10kV line topology subordinate district, a 10kV line topology subordinate power supply station, a 10kV line topology subordinate substation and a 10kV line photovoltaic installation capacity.
103, acquiring distribution network production operation data and 10kV line outgoing meter counted 10kV line annual maximum current and 10kV line annual maximum current time, wherein the production operation data comprises 10kV line current-carrying capacity, 10kV line name and 10kV line number, and the 10kV line annual maximum current and 10kV line annual maximum current time counted by the 10kV line outgoing meter are associated with the 10kV line number.
It should be noted that the production operation data of the distribution network can be obtained by establishing a data interface with a production operation system, which is a subsystem of the distribution network production management system, and the production operation data includes the current-carrying capacity of the 10kV line, the name of the 10kV line, and the number of the 10kV line. The annual maximum current of the 10kV line can be obtained through data counted by a 10kV line outgoing meter, specifically, the 10kV line outgoing meter obtains data of one point current of each 10kV line in 15 minutes, the number of the points is 96 points in one day, the data are stored, the maximum current point of 96 points in each day and the time of the point are automatically analyzed, the daily maximum current and the maximum current time are obtained, the monthly maximum current is analyzed to compare the daily maximum current with the maximum current time, the monthly maximum current and the monthly maximum current time are obtained, the annual maximum current is analyzed according to the monthly maximum current, and finally the annual maximum current and the annual maximum current time of each 10kV line are obtained.
And 104, correlating the production operation data, the annual maximum current of the 10kV line and the annual maximum current time of the 10kV line by using the number of the 10kV line to obtain second data.
It should be noted that, in the embodiment of the present invention, the execution of step 103 and step 104 may be performed synchronously with the execution of step 101 and step 102.
And 105, obtaining third data, wherein the third data are a 10kV line list of an active power meter, a 10kV line list of a non-power meter and daily power meter data of 10kV lines of the active power meter, and the 10kV line list of the active power meter and the 10kV line list of the non-power meter contain 10kV line numbers of each 10kV line.
It should be noted that, a data interface is established with the metering system, a 10kV line list with a 10kV line outgoing power meter and a 10kV line list without a power meter are obtained, and daily power meter data of the 10kV line of the power meter are obtained, and the data obtaining and storing frequency is one point every 15 minutes, and is totally 96 points daily. Through the data of the associated metering system, whether the 10kV line of the 10kV line outgoing power meter is classified respectively can be judged.
And 106, associating the first data, the second data and the third data by taking the 10kV line number as a key field.
And 107, calculating the photovoltaic permeability of the 10kV line according to the current-carrying capacity of the 10kV line and the photovoltaic loading capacity of the 10kV line.
It should be noted that the calculation formula of the photovoltaic permeability of the 10kV line is as follows:
Figure 372417DEST_PATH_IMAGE004
Figure 402690DEST_PATH_IMAGE005
wherein, the first and the second end of the pipe are connected with each other,Ris the photovoltaic permeability of a 10kV line,
Figure 295559DEST_PATH_IMAGE003
is the current-carrying capacity of a 10kV line,
Figure 335059DEST_PATH_IMAGE006
is the photovoltaic installation capacity of a 10kV line,
Figure 262564DEST_PATH_IMAGE007
the maximum allowable capacity of a 10kV line.
And 108, judging whether the annual maximum current of the 10kV line is caused by photovoltaic active power feedback or not according to daily power meter data corresponding to the annual maximum current time of the 10kV line and the annual maximum current time of the 10kV line for the 10kV line outgoing active power meter.
It should be noted that 10kV lines of the 10kV line outgoing active power meter are screened out by associating with the metering system data, and for the 10kV lines of the 10kV line outgoing active power meter, according to the annual maximum current time of the 10kV lines and the annual maximum current time power meter data of the 10kV lines, it is judged whether the annual maximum current of the 10kV lines is caused by the photovoltaic active power feedback. Specifically, for a 10kV line of a 10kV line outgoing active power meter, it is determined whether the maximum current time per year of the 10kV line is 07.
And step 109, judging whether the annual maximum current of the 10kV line is caused by photovoltaic active power feedback or not according to the photovoltaic permeability of the 10kV line, the annual maximum current time of the 10kV line and the daily power meter data corresponding to the annual maximum current time of the 10kV line for the 10kV line without the power meter for the outgoing line of the 10kV line.
It should be noted that 10kV lines of the 10kV line outgoing line powerless meter are screened out by associating with the metering system data, and for the 10kV lines of the 10kV line outgoing line powerless meter, according to the photovoltaic permeability of the 10kV lines, the annual maximum current time of the 10kV lines and the annual maximum current time power meter data of the 10kV lines, it is determined whether the annual maximum current of the 10kV lines is caused by the photovoltaic active power feedback. Specifically, for a 10kV line of a 10kV line outgoing powerless meter, judging whether the photovoltaic permeability of the 10kV line is more than 40%, whether the annual maximum current time of the 10kV line is within a range of 07 to 18, whether the annual maximum current time of the 10kV line is 0-6 points, and whether the annual maximum current of 18-24 points is more than 50% of the annual maximum current of the 10kV line, and judging whether the annual maximum current curve of the 10kV line, which is drawn by taking 15 minutes as 1 point within a range of 07 to 18 within a range of 00. The annual maximum current day of the 10kV line is the day corresponding to the annual maximum current.
And 110, respectively counting 10kV line lists caused by photovoltaic active power feedback corresponding to the 10kV line outgoing active power meter and the 10kV line annual maximum current corresponding to the no-power meter, and outputting the 10kV line lists caused by photovoltaic active power feedback according to preset counting charts by using the 10kV line topology dependent district and the 10kV line topology dependent power supply station respectively.
It should be noted that, the statistics of the 10kV line annual maximum current corresponding to the 10kV line outgoing active power meter and the no-power meter is a 10kV line list caused by the photovoltaic active power return, and the 10kV line list caused by the photovoltaic active power return is output according to the preset statistical chart by the dimensions of the whole city, each district and each power supply station respectively. The specific content presented by the list comprises: the method comprises the following steps of obtaining a power meter power corresponding to 10kV line name, a 10kV line topology subordinate district, a 10kV line topology subordinate power supply station, a 10kV line topology subordinate substation, 10kV line photovoltaic installation capacity, 10kV line current-carrying capacity, 10kV line annual maximum current time, 10kV line annual maximum load rate, 10kV line photovoltaic permeability and 10kV line annual maximum current time. The monthly highest and lowest current curves may also be statistically analyzed.
According to the method for analyzing the annual maximum current of the distribution network line caused by photovoltaic return transmission, provided by the embodiment of the invention, distribution network marketing account information, production equipment information, production operation data, a 10kV line list of an active power meter and daily power meter data are obtained, correlation and calculation are carried out on the obtained data, the annual maximum current of the 10kV line, the annual maximum load rate of the 10kV line and the photovoltaic permeability of the 10kV line are obtained, then judgment on whether the annual maximum current of the 10kV line is photovoltaic active power return transmission or not is respectively carried out on the 10kV line of the 10kV line outgoing active power meter and the 10kV line of the 10kV line outgoing powerless meter, a technical blank of the annual maximum current cause of the 10kV line with distributed photovoltaic access is filled, whether the annual maximum current of the 10kV line is generated by photovoltaic active power return transmission or not is accurately judged, safe and reliable operation of a power grid is guaranteed, 10kV line load characteristic analysis and investment analysis are provided for the equipment operation and maintenance, and powerful support is solved, the problem that the annual maximum current collection of the existing 10kV line analysis of a transformer substation 10kV line is dependent on the annual maximum current collection and reliable operation of the photovoltaic return transmission technology, and the problem of the photovoltaic power network caused by the annual maximum current management is solved.
In one embodiment, the annual maximum load rate of the 10kV line can be further calculated according to the annual maximum current of the 10kV line and the current-carrying capacity of the 10kV line, and the calculation formula of the annual maximum load rate of the 10kV line is as follows:
Figure 463738DEST_PATH_IMAGE001
wherein, the first and the second end of the pipe are connected with each other,Fis the annual highest load rate of a 10kV line,
Figure 109483DEST_PATH_IMAGE002
is the maximum annual current of a 10kV line,
Figure 359199DEST_PATH_IMAGE003
the current-carrying capacity of the 10kV line. The second data obtained by correlation comprises the name of the 10kV line, the current-carrying capacity of the 10kV line, the annual maximum current time of the 10kV line and the annual maximum load rate of the 10kV line.
When the production operation data, the annual maximum current of the 10kV line and the annual maximum current time of the 10kV line are related by the serial number of the 10kV line to obtain second data, the annual maximum load rate of the 10kV line is also related to the second data, and when a 10kV line list caused by photovoltaic active power feedback is output according to a preset statistical chart by the dimension of a 10kV line topology subordinate district and a 10kV line topology subordinate power supply, the information of the preset statistical chart comprises the annual maximum load rate of the 10kV line, so that the annual maximum load rate information of the 10kV line caused by photovoltaic active power feedback can be visually embodied, and management and analysis personnel can conveniently obtain key information of the 10kV line caused by photovoltaic active power feedback.
For convenience of understanding, please refer to fig. 3, an embodiment of a system for analyzing annual maximum current of a distribution network line caused by photovoltaic foldback is provided in the present invention, and includes a photovoltaic ledger data analysis module, a 10kV annual maximum current analysis module of the line, a photovoltaic active power foldback intelligent analysis module, and a system output module;
photovoltaic standing book data analysis module is used for:
acquiring distribution network marketing account information and production equipment information, wherein the marketing account information comprises 10kV line photovoltaic installation capacity, 10kV line names and 10kV line numbers of photovoltaic users, and the production equipment information comprises 10kV line names, 10kV line numbers, 10kV line topology dependent substations, 10kV line topology dependent district offices and 10kV line topology dependent power supply stations;
associating marketing standing book information and production equipment information by using a 10kV line number to obtain first data;
the annual maximum current analysis module of the 10kV line is used for:
acquiring distribution network production operation data and 10kV line annual maximum current counted by a 10kV line outlet meter and 10kV line annual maximum current time, wherein the production operation data comprises 10kV line current-carrying capacity, 10kV line name and 10kV line number, and the 10kV line annual maximum current counted by the 10kV line outlet meter and the 10kV line annual maximum current time are associated with the 10kV line number;
correlating the production operation data, the annual maximum current of the 10kV line and the annual maximum current time of the 10kV line by using the number of the 10kV line to obtain second data;
photovoltaic active power returns intelligent analysis module is used for:
acquiring third data, wherein the third data are a 10kV line list of an active power meter and daily power meter data;
associating the first data, the second data and the third data by taking the number of the 10kV line as a key field, and creating target row data, wherein the target row data comprises a name of the 10kV line, a topological subordinate district office of the 10kV line, a topological subordinate power supply station of the 10kV line, a topological subordinate transformer substation of the 10kV line, a photovoltaic loading capacity of the 10kV line, a current-carrying capacity of the 10kV line, an annual maximum current of the 10kV line and an annual maximum current time of the 10kV line;
calculating the photovoltaic permeability of the 10kV line according to the current-carrying capacity of the 10kV line and the photovoltaic loading capacity of the 10kV line;
for a 10kV line of a 10kV line outgoing active power meter, judging whether annual maximum current of the 10kV line is caused by photovoltaic active power feedback or not according to annual maximum current time of the 10kV line and annual maximum current time power meter data of the 10kV line;
for a 10kV line of a 10kV line outgoing line powerless meter, judging whether the annual maximum current of the 10kV line is caused by photovoltaic active power feedback or not according to the photovoltaic permeability of the 10kV line, the annual maximum current time of the 10kV line and power meter data of the annual maximum current time of the 10kV line;
the system output module is used for:
respectively counting 10kV line lists caused by photovoltaic active power feedback corresponding to a 10kV line outgoing active power table and a no-power table, and respectively outputting the 10kV line lists caused by photovoltaic active power feedback according to a preset counting chart by using a 10kV line topology subordinate region and a 10kV line topology subordinate power supply station.
For the 10kV circuit of the active power table of being qualified for the next round of competitions of 10kV circuit, according to annual maximum current time of 10kV circuit and annual maximum current time power table data of 10kV circuit, judge whether annual maximum current of 10kV circuit is that photovoltaic active power is returned and is caused, include:
for a 10kV line of a 10kV line outgoing active power meter, judging whether the annual maximum current time of the 10kV line is 07 to 18, whether power meter data of the annual maximum current time of the 10kV line is negative or not and whether 4 integral point power meter data before and after the annual maximum current time of the 10kV line are changed or not, if yes, judging that the annual maximum current of the 10kV line is caused by photovoltaic active power returning, and otherwise, judging that the annual maximum current of the 10kV line is not caused by photovoltaic active power returning;
for a 10kV line of a 10kV line outgoing line powerless meter, judging whether the annual maximum current of the 10kV line is caused by photovoltaic active power feedback according to the photovoltaic permeability of the 10kV line, the annual maximum current time of the 10kV line and the annual maximum current time power meter data of the 10kV line, and the method comprises the following steps:
for a 10kV line of a 10kV line outgoing powerless meter, judging whether the photovoltaic permeability of the 10kV line is more than 40%, whether the annual maximum current time of the 10kV line is 07 to 18 within a period of 00 to 10, whether the annual maximum current time of the 10kV line is 0 to 6 points, and whether the annual maximum current of 18 to 24 points is more than 50% of the annual maximum current of the 10kV line, and whether a 10kV line current curve drawn by taking 15 minutes as 1 point within a period of 07 to 18 within a period of 10kV line year maximum current day, if so, judging that the annual maximum current of the 10kV line is caused by photovoltaic active power feedback, otherwise, judging that the annual maximum current of the 10kV line is not caused by photovoltaic active power feedback, wherein the annual maximum current day of the 10kV line is the day corresponding to the annual maximum current.
The 10kV line annual maximum current analysis module is also used for:
calculating the annual maximum load rate of the 10kV line according to the annual maximum current of the 10kV line and the current-carrying capacity of the 10kV line, wherein the annual maximum load rate of the 10kV line is calculated by the following formula:
Figure 141210DEST_PATH_IMAGE001
wherein the content of the first and second substances,Fis the annual highest load rate of a 10kV line,
Figure 450969DEST_PATH_IMAGE002
is the maximum annual current of a 10kV line,
Figure 849589DEST_PATH_IMAGE003
the current-carrying capacity of the 10kV line is obtained;
the calculation formula of the photovoltaic permeability of the 10kV line is as follows:
Figure 902996DEST_PATH_IMAGE004
Figure 805093DEST_PATH_IMAGE005
wherein the content of the first and second substances,Ris the photovoltaic permeability of a 10kV line,
Figure 82490DEST_PATH_IMAGE003
is the current-carrying capacity of a 10kV line,
Figure 374931DEST_PATH_IMAGE006
is the photovoltaic installation capacity of a 10kV line,
Figure 559925DEST_PATH_IMAGE007
the maximum allowable capacity of the 10kV line.
According to the annual maximum current analysis system for the distribution network lines caused by photovoltaic return, which is provided by the invention, distribution network marketing account information, production equipment information, production operation data, a 10kV line list of an active power meter and daily power meter data are obtained, correlation and calculation are carried out on the obtained data, 10kV line annual maximum current, 10kV line annual maximum load rate and 10kV line photovoltaic permeability are obtained, then judgment of whether 10kV line annual maximum current is photovoltaic active power return or not is respectively carried out on a 10kV line of the 10kV line outgoing active power meter and a 10kV line of a 10kV line outgoing powerless meter, a technical blank of a 10kV line annual maximum current cause with distributed photovoltaic access is filled, whether 10kV line annual maximum current is generated by photovoltaic active power return or not is accurately judged, safe and reliable operation of a power grid is guaranteed, 10kV line load characteristic analysis is achieved, powerful support is provided for equipment operation and maintenance planning, and the problem that existing 10kV line annual maximum current analysis depends on current collection of a substation 10kV line gateway is solved, the annual maximum current collection of the power grid is not accurately analyzed, the annual maximum current collection of the power grid is caused by photovoltaic active power return, and even the problem that the annual maximum current of the photovoltaic line annual operation is caused by photovoltaic return of the distribution network is solved, and the existing technology and the problem that the photovoltaic return of the power distribution network is caused by the photovoltaic return is solved.
The annual maximum current analysis system of the distribution network line caused by the photovoltaic foldback provided by the embodiment of the invention is used for executing the annual maximum current analysis method of the distribution network line caused by the photovoltaic foldback provided by the invention, and the working principle and the obtained technical effect of the annual maximum current analysis system of the distribution network line caused by the photovoltaic foldback are the same as those of the annual maximum current analysis method of the distribution network line caused by the photovoltaic foldback provided by the invention, and are not repeated herein.
The above-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should 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 (10)

1. A method for analyzing annual maximum current of a distribution network line caused by photovoltaic return is characterized by comprising the following steps:
acquiring distribution network marketing account information and production equipment information, wherein the marketing account information comprises 10kV line photovoltaic installation capacity, 10kV line names and 10kV line numbers of photovoltaic users, and the production equipment information comprises 10kV line names, 10kV line numbers, 10kV line topology subordinate district offices and 10kV line topology subordinate power supply stations;
associating marketing standing book information and production equipment information by using the 10kV line number to obtain first data;
acquiring distribution network production operation data and 10kV line annual maximum current counted by a 10kV line outlet meter and 10kV line annual maximum current time, wherein the production operation data comprises 10kV line current-carrying capacity, 10kV line name and 10kV line number, and the 10kV line annual maximum current counted by the 10kV line outlet meter and the 10kV line annual maximum current time are associated with the 10kV line number;
correlating the production operation data, the annual maximum current of the 10kV line and the annual maximum current time of the 10kV line by using the serial number of the 10kV line to obtain second data;
obtaining third data, wherein the third data are a 10kV line list of an active power meter, a 10kV line list of a non-power meter and daily power meter data of 10kV lines of the active power meter, and the 10kV line list of the active power meter and the 10kV line list of the non-power meter contain 10kV line numbers of each 10kV line;
associating the first data, the second data and the third data by taking the number of the 10kV line as a key field;
calculating the photovoltaic permeability of the 10kV line according to the current-carrying capacity of the 10kV line and the photovoltaic loading capacity of the 10kV line;
determining 10kV lines of a 10kV line outgoing active power table according to a 10kV line list of the active power table, and judging whether the annual maximum current of the 10kV lines of the 10kV line outgoing active power table is caused by photovoltaic active power feedback or not according to daily power meter data corresponding to the annual maximum current time of the 10kV lines and the annual maximum current time of the 10kV lines;
determining a 10kV line of a 10kV line outgoing powerless meter according to a 10kV line list of the powerless meter, and judging whether the annual maximum current of the 10kV line outgoing powerless meter of the 10kV line is caused by photovoltaic active power feedback or not according to daily power meter data corresponding to the photovoltaic permeability of the 10kV line, the annual maximum current time of the 10kV line and the annual maximum current time of the 10kV line;
respectively counting 10kV line lists caused by photovoltaic active power feedback corresponding to a 10kV line outgoing active power table and a no-power table, and respectively outputting the 10kV line lists caused by photovoltaic active power feedback according to preset statistical charts by using dimensions of a 10kV line topology subordinate area and a 10kV line topology subordinate power supply station.
2. The method for analyzing annual maximum current of distribution network lines caused by photovoltaic foldback according to claim 1, wherein for a 10kV line of a 10kV line outgoing active power meter, judging whether annual maximum current of the 10kV line is caused by photovoltaic active power foldback according to annual maximum current time of the 10kV line and annual maximum current time power meter data of the 10kV line comprises the following steps:
for a 10kV line of a 10kV line outgoing active power meter, judging whether the annual maximum current time of the 10kV line is 07 to 18, whether power meter data of the annual maximum current time of the 10kV line is negative or not and whether 4 integral point power meter data before and after the annual maximum current time of the 10kV line are changed or not, if yes, judging that the annual maximum current of the 10kV line is caused by photovoltaic active power returning, and otherwise, judging that the annual maximum current of the 10kV line is not caused by photovoltaic active power returning.
3. The method for analyzing annual maximum current of distribution network lines caused by photovoltaic foldback according to claim 1, wherein for a 10kV line of a 10kV line outgoing powerless meter, judging whether the annual maximum current of the 10kV line is caused by photovoltaic active power foldback according to the photovoltaic permeability of the 10kV line, the annual maximum current time of the 10kV line and the annual maximum current time power meter data of the 10kV line comprises the following steps:
for a 10kV line of a 10kV line outgoing powerless meter, judging whether the photovoltaic permeability of the 10kV line is more than 40%, whether the annual maximum current time of the 10kV line is 07 to 18 within a period of 00 to 10, whether the annual maximum current time of the 10kV line is 0 to 6 points, and whether the annual maximum current of 18 to 24 points is more than 50% of the annual maximum current of the 10kV line, and whether a 10kV line current curve drawn by taking 15 minutes as 1 point within a period of 07 to 18 within a period of 10kV line year maximum current day, if so, judging that the annual maximum current of the 10kV line is caused by photovoltaic active power feedback, otherwise, judging that the annual maximum current of the 10kV line is not caused by photovoltaic active power feedback, wherein the annual maximum current day of the 10kV line is the day corresponding to the annual maximum current.
4. The method for analyzing annual maximum current of distribution network lines caused by photovoltaic foldback according to claim 1, wherein the production operation data, the annual maximum current of 10kV lines and the annual maximum current time of 10kV lines are correlated with each other by a 10kV line number to obtain second data, and the method further comprises the following steps:
calculating the annual maximum load rate of the 10kV line according to the annual maximum current of the 10kV line and the current-carrying capacity of the 10kV line, wherein the annual maximum load rate of the 10kV line is calculated according to the following formula:
Figure 205315DEST_PATH_IMAGE001
wherein the content of the first and second substances,Fis the annual highest load rate of a 10kV line,
Figure 523426DEST_PATH_IMAGE002
is the maximum annual current of a 10kV line,
Figure 322755DEST_PATH_IMAGE003
the current-carrying capacity of the 10kV line is obtained;
correspondingly, the annual highest load rate of the 10kV line is associated to the second data, and when a 10kV line list caused by photovoltaic active power returning is output according to a preset statistical chart by a 10kV line topology subordinate district office and a 10kV line topology subordinate power supply station, the information of the preset statistical chart comprises the annual highest load rate of the 10kV line.
5. The method for analyzing the annual maximum current of the distribution network lines caused by the photovoltaic foldback according to claim 1, wherein the calculation formula of the photovoltaic permeability of the 10kV lines is as follows:
Figure 908457DEST_PATH_IMAGE004
Figure 400618DEST_PATH_IMAGE005
wherein the content of the first and second substances,Ris the photovoltaic permeability of a 10kV line,
Figure 265412DEST_PATH_IMAGE003
is the current-carrying capacity of a 10kV line,
Figure 602853DEST_PATH_IMAGE006
is the photovoltaic installation capacity of a 10kV line,
Figure 308641DEST_PATH_IMAGE007
the maximum allowable capacity of the 10kV line.
6. A photovoltaic foldback-caused annual maximum current analysis system for a distribution network line is characterized by comprising a photovoltaic ledger data analysis module, a 10kV annual maximum current analysis module for the line, a photovoltaic active power foldback intelligent analysis module and a system output module;
photovoltaic standing book data analysis module is used for:
acquiring distribution network marketing account information and production equipment information, wherein the marketing account information comprises 10kV line photovoltaic installation capacity, 10kV line names and 10kV line numbers of photovoltaic users, and the production equipment information comprises 10kV line names, 10kV line numbers, 10kV line topology subordinate district offices and 10kV line topology subordinate power supply stations;
associating marketing standing book information and production equipment information by using a 10kV line number to obtain first data;
the annual maximum current analysis module of the 10kV line is used for:
acquiring distribution network production operation data and 10kV line annual maximum current counted by a 10kV line outlet meter and 10kV line annual maximum current time, wherein the production operation data comprises 10kV line current-carrying capacity, 10kV line name and 10kV line number, and the 10kV line annual maximum current counted by the 10kV line outlet meter and the 10kV line annual maximum current time are associated with the 10kV line number;
correlating the production operation data, the annual maximum current of the 10kV line and the annual maximum current time of the 10kV line by using the number of the 10kV line to obtain second data;
photovoltaic active power sends back intelligent analysis module and is used for:
obtaining third data, wherein the third data are a 10kV line list of an active power meter, a 10kV line list of a non-power meter and daily power meter data of 10kV lines of the active power meter, and the 10kV line list of the active power meter and the 10kV line list of the non-power meter contain 10kV line numbers of each 10kV line;
associating the first data, the second data and the third data by taking the serial number of the 10kV line as a key field;
calculating the photovoltaic permeability of the 10kV line according to the current-carrying capacity of the 10kV line and the photovoltaic loading capacity of the 10kV line;
determining 10kV lines of a 10kV line outgoing active power table according to a 10kV line list of the active power table, and judging whether annual maximum current of the 10kV lines of the 10kV line outgoing active power table is caused by photovoltaic active power feedback or not according to daily power meter data corresponding to annual maximum current time of the 10kV lines and annual maximum current time of the 10kV lines;
determining a 10kV line of a 10kV line outgoing powerless meter according to a 10kV line list of the powerless meter, and judging whether the annual maximum current of the 10kV line outgoing powerless meter of the 10kV line is caused by photovoltaic active power feedback or not according to daily power meter data corresponding to the photovoltaic permeability of the 10kV line, the annual maximum current time of the 10kV line and the annual maximum current time of the 10kV line;
the system output module is used for:
respectively counting 10kV line lists caused by photovoltaic active power feedback corresponding to a 10kV line outgoing active power table and a no-power table, and respectively outputting the 10kV line lists caused by photovoltaic active power feedback according to a preset counting chart by using a 10kV line topology subordinate region and a 10kV line topology subordinate power supply station.
7. The system for analyzing annual maximum current of distribution network lines caused by photovoltaic foldback according to claim 6, wherein for a 10kV line of a 10kV line outgoing active power meter, judging whether the annual maximum current of the 10kV line is caused by photovoltaic active power foldback according to annual maximum current time of the 10kV line and annual maximum current time power meter data of the 10kV line comprises:
for a 10kV line of a 10kV line outgoing active power meter, judging whether the annual maximum current time of the 10kV line is 07 to 18 within the period of 00, whether the annual maximum current time of the 10kV line is negative and whether 4 integral point power meter data before and after the annual maximum current time of the 10kV line are changed, if so, judging that the annual maximum current of the 10kV line is caused by photovoltaic active power feedback, and otherwise, judging that the annual maximum current of the 10kV line is not caused by photovoltaic active power feedback.
8. The system for analyzing annual maximum current of distribution network lines caused by photovoltaic foldback according to claim 6, wherein for a 10kV line of a 10kV line outgoing line powerless meter, judging whether the annual maximum current of the 10kV line is caused by photovoltaic active power foldback according to the photovoltaic permeability of the 10kV line, the annual maximum current time of the 10kV line and the annual maximum current time power meter data of the 10kV line comprises:
for a 10kV line of a 10kV line outgoing powerless meter, judging whether the photovoltaic permeability of the 10kV line is more than 40%, whether the annual maximum current time of the 10kV line is 07 to 18 within a period of 00 to 10, whether the annual maximum current of the 10kV line is 0 to 6 points within a period of 10kV line, and whether the annual maximum current of 18 to 24 points is more than 50% of the annual maximum current of the 10kV line, and whether a 10kV line current curve drawn by taking 15 minutes as 1 point within a period of 10kV line within a period of 07 to 18 within a period of 00.
9. The system for annual maximum current analysis of distribution network lines caused by photovoltaic foldback of claim 6, wherein the 10kV annual maximum current analysis module is further configured to:
calculating the annual maximum load rate of the 10kV line according to the annual maximum current of the 10kV line and the current-carrying capacity of the 10kV line, wherein the annual maximum load rate of the 10kV line is calculated according to the following formula:
Figure 207589DEST_PATH_IMAGE001
wherein, the first and the second end of the pipe are connected with each other,Fis the annual highest load rate of a 10kV line,
Figure 998827DEST_PATH_IMAGE002
is the maximum annual current of a 10kV line,
Figure 139959DEST_PATH_IMAGE003
the current carrying capacity is 10kV line current carrying capacity;
correspondingly, the annual highest load rate of the 10kV line is associated to the second data, and when the system output module outputs a 10kV line list caused by photovoltaic active power returning according to a preset statistical chart in the dimensions of a 10kV line topology subordinate district and a 10kV line topology subordinate power supply station, the information of the preset statistical chart comprises the annual highest load rate of the 10kV line.
10. The system for analyzing annual maximum current of distribution network lines caused by photovoltaic foldback according to claim 6, wherein a calculation formula of the photovoltaic permeability of the 10kV lines is as follows:
Figure 700253DEST_PATH_IMAGE004
Figure 32752DEST_PATH_IMAGE005
wherein the content of the first and second substances,Ris the photovoltaic permeability of a 10kV line,
Figure 45707DEST_PATH_IMAGE003
is the current-carrying capacity of a 10kV line,
Figure 52846DEST_PATH_IMAGE006
is the photovoltaic installation capacity of a 10kV line,
Figure 969112DEST_PATH_IMAGE007
the maximum allowable capacity of the 10kV line.
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