An analysis method and system for heavy overload of 10kV lines caused by photovoltaic access

Abstract

The present application discloses an analysis method and system for heavy overload of 10kV lines caused by photovoltaic access. By obtaining equipment ledgers, line operation and photovoltaic metering data; after correlating the equipment ledgers and operation data to obtain integrated data and eliminating the data from the integrated data, a list of heavily overloaded lines is screened from the integrated data according to the annual maximum load rate; after correlating the list of heavily overloaded lines and the metering data, the electricity customer numbers and current information of photovoltaic households whose grid connection dates are before the date of the annual maximum current of the line are obtained; the total grid-connected current of photovoltaic at the moment of the annual maximum current of the line is calculated to obtain the metering auxiliary analysis result, and the total grid-connected current of all photovoltaic households in the hour of the annual maximum current of the line is calculated to obtain the electricity quantity auxiliary analysis result; the annual maximum current of the line is respectively compared with the two analysis results, and the two comparison results are matched to obtain a list of lines where distributed photovoltaic causes equipment heavy overload. The problem that the prior art cannot judge the reason for equipment heavy overload is solved.

Description

Technical Field

[0001] The present application relates to the technical field of electric power, and in particular to an analysis method and system for heavy overload of 10 kV lines caused by photovoltaic access. Background Art

[0002] In the face of the overwhelming access of new energy, the access of distributed photovoltaics often affects the safety and operation of the entire power grid equipment. After the access of distributed photovoltaics, there are two situations for photovoltaics: local consumption and power return to the grid. If a large amount of distributed photovoltaics are connected to the same distribution transformer, the same 10 kV line, or even the main transformer of the same substation, there will be heavy overload of equipment caused by the power return to the grid due to the access of distributed photovoltaics.

[0003] Traditionally, the heavy overload of 10 kV lines in the distribution network is still considered to be caused by load growth. Only the ratio of the maximum operating current value of the 10 kV line in the distribution network to the rated current-carrying capacity of the 10 kV line is simply used to judge the heavy overload of the line. When the ratio of the maximum operating current value of the 10 kV line to the rated current-carrying capacity of the 10 kV line exceeds 80%, it is defined as heavy load, and when it exceeds 100%, it is defined as overload. However, due to the access of distributed photovoltaics, there will be a situation where the power is returned to the grid, resulting in heavy overload of the 10 kV line. At present, there is still no tool and technology to solve the problem of judging whether the heavy overload of the equipment is caused by the natural growth of the load or the power return to the grid due to the access of distributed photovoltaics. Summary of the Invention

[0004] The present application provides an analysis method and system for heavy overload of 10 kV lines caused by photovoltaic access, which is used to solve the technical problem that the existing technology cannot judge the cause of heavy overload of equipment.

[0005] In view of this, the first aspect of the present application provides an analysis method for heavy overload of 10 kV lines caused by photovoltaic access, and the method includes:

[0006] S1. Obtain the equipment ledger of the distribution network production system, the operation data of the 10 kV line in the distribution network, and the metering underlying data of the photovoltaic user metering point;

[0007] S2. Perform associated matching on the equipment ledger and the operation data to obtain integrated data. After data elimination on the integrated data according to the annual maximum current value, screen out the 10 kV line heavy overload list from the integrated data according to the preset annual maximum load rate;

[0008] S3. After performing data association on the 10 kV line heavy overload list and the metering underlying data, obtain the electricity user numbers, grid connection dates, and current information of the subordinate metering tables of photovoltaic users whose grid connection dates are before the annual maximum current date under the 10 kV line;

[0009] S4. Based on the electricity user number and the current information, calculate the total grid-connected current of the PV at the moment of the annual maximum current of the 10kV line to obtain the measurement auxiliary analysis result, and calculate the total grid-connected current of all PV users during the hour of the annual maximum current of the 10kV line to obtain the electricity quantity auxiliary analysis result;

[0010] S5. Compare the annual maximum current of the 10kV line with the measurement auxiliary analysis result and the electricity quantity auxiliary analysis result respectively, and perform correlation matching on the two comparison results to obtain the first line list of equipment heavy overload caused by distributed PV.

[0011] Optionally, after step S5, it further includes:

[0012] All lines after removing the 10kV line from the 10kV line heavy overload list are determined to be heavy overload of the 10kV line caused by natural load growth, and the second line list is obtained.

[0013] Optionally, after step S5, it further includes:

[0014] Generate a list report of the first line list and the second line list by city or district; and generate a curve chart of the electricity quantity and current information of the metering grid-connected household meter and the power generation household meter of the PV electricity users on the day of the annual maximum current of each 10kV heavy overload line.

[0015] Optionally, after data elimination of the integrated data according to the annual maximum current value, screening out the 10kV line heavy overload list from the first integrated data according to the preset annual maximum load rate specifically includes:

[0016] Define the points with a difference of more than 40% from the previous and next points in the operating current as mutation points;

[0017] After eliminating the data with the annual maximum current value as the mutation point in the integrated data, define the annual maximum load rate of 80% - 100% in the integrated data as the heavy load of the 10kV line, and define the annual maximum load rate of more than 100% as overload to obtain the 10kV line heavy overload list.

[0018] Optionally, the calculating the total grid-connected current of the PV at the moment of the annual maximum current of the 10kV line based on the electricity user number and the current information to obtain the measurement auxiliary analysis result specifically includes:

[0019] Calculate all the installed capacities before the day of the annual maximum current, and the power generation current and grid-connected current of all PV power generation household meters in the hour to which the moment of the annual maximum current belongs;

[0020] After removing the points where the grid-connected current is greater than the power generation current and the points where 80% of the declared installation capacity output is less than the power generation current and the grid-connected current, the grid-connected currents of all hours of all PV households are superimposed to obtain the metering auxiliary analysis result.

[0021] Optionally, calculating the total grid-connected current of all PV households at the highest current hour of the 10 kV line in a year to obtain the electricity quantity auxiliary analysis result, specifically including:

[0022] After obtaining the electricity quantity information of PV users whose grid connection dates are before the highest current date under the 10 kV heavy overload line, the daily grid-connected electricity quantities of all PV users under the 10 kV line are accumulated, and the product of the accumulated electricity quantity and the effective daily irradiation time and the voltage level is used as the electricity quantity auxiliary analysis result.

[0023] Optionally, step S5 specifically includes:

[0024] Comparing the highest current of the 10 kV line with the metering auxiliary analysis result, and if the total grid-connected current of PV at the highest current moment is greater than the preset annual highest current value of the corresponding 10 kV line, it is determined that the metering auxiliary distributed PV causes equipment heavy overload, and a first list is obtained;

[0025] Comparing the highest current of the 10 kV line with the electricity quantity auxiliary analysis result, and if the total grid-connected current of PV at the highest current moment is greater than the preset annual highest current value of the corresponding 10 kV line, it is determined that the electricity quantity auxiliary distributed PV causes equipment heavy overload, and a second list is obtained;

[0026] Correlating and matching the first list and the second list to obtain the first line list of equipment heavy overload caused by distributed PV.

[0027] The second aspect of the present application provides an analysis system for 10 kV line heavy overload caused by PV access, and the system includes:

[0028] An acquisition unit, configured to acquire the equipment ledger of the distribution network production system, the operation data of the 10 kV line of the distribution network, and the metering underlying data of the metering points of PV users;

[0029] A first matching unit, configured to perform correlation matching on the equipment ledger and the operation data to obtain integrated data, perform data elimination on the integrated data according to the annual highest current value, and then screen out the 10 kV line heavy overload list from the integrated data according to the preset annual highest load rate;

[0030] A second matching unit, configured to perform data association on the 10 kV line heavy overload list and the metering underlying data, and obtain the user numbers, grid connection dates, and current information of the subordinate metering meters of PV households whose grid connection dates are before the highest current date under the 10 kV line;

[0031] A calculation unit, configured to calculate the total grid-connected current of photovoltaic power at the moment of the annual maximum current of the 10 kV line based on the electricity user number and the current information, to obtain a measurement auxiliary analysis result, and to calculate the total grid-connected current of all photovoltaic users in the hour of the annual maximum current of the 10 kV line, to obtain an electricity quantity auxiliary analysis result;

[0032] A first analysis unit, configured to compare the annual maximum current of the 10 kV line with the measurement auxiliary analysis result and the electricity quantity auxiliary analysis result respectively, and to perform correlation matching on the two comparison results, to obtain a first line list of equipment heavy overload caused by distributed photovoltaic power.

[0033] Optionally, it further includes: a second analysis unit;

[0034] The second analysis unit is configured to determine that all lines after removing the 10 kV line from the 10 kV line heavy overload list are caused by natural load growth resulting in 10 kV line heavy overload, to obtain a second line list.

[0035] Optionally, it further includes: a generating unit;

[0036] The generating unit is configured to generate a list report of the first line list and the second line list in units of cities or districts; and to generate a curve chart of the electricity quantity and current information of the photovoltaic electricity user measurement grid-connected household meter and the power generation household meter on the day of the annual maximum current of each 10 kV heavy overload line.

[0037] It can be seen from the above technical solutions that the present application has the following advantages:

[0038] The present application provides an analysis method for heavy overload of 10 kV lines caused by photovoltaic access, including: S1, obtaining the equipment ledger of the distribution network production system, the operation data of the 10 kV line of the distribution network, and the measurement underlying data of the photovoltaic user measurement point; S2, performing correlation matching on the equipment ledger and the operation data to obtain integrated data, and after data elimination on the integrated data according to the annual maximum current value, screening out a 10 kV line heavy overload list from the integrated data according to the preset annual maximum load rate; S3, after performing data association on the 10 kV line heavy overload list and the measurement underlying data, obtaining the electricity user number, grid connection date, and current information of the subordinate measurement meter of the photovoltaic users whose grid connection dates are before the annual maximum current date under the 10 kV line; S4, based on the electricity user number and the current information, calculating the total grid-connected current of photovoltaic power at the moment of the annual maximum current of the 10 kV line, to obtain a measurement auxiliary analysis result, and calculating the total grid-connected current of all photovoltaic users in the hour of the annual maximum current of the 10 kV line, to obtain an electricity quantity auxiliary analysis result; S5, comparing the annual maximum current of the 10 kV line with the measurement auxiliary analysis result and the electricity quantity auxiliary analysis result respectively, and performing correlation matching on the two comparison results, to obtain a first line list of equipment heavy overload caused by distributed photovoltaic power.

[0039] Compared with the prior art, the present application: 1) Based on the correlation of multi-service underlying data, the PV installation capacity and metering point data (including power and current data) of the 10kV heavy overload line are presented and dynamically updated without any manual participation; 2) Through dual determination of auxiliary analysis of metering data and auxiliary analysis of power data, it is determined that the reverse power feed of distributed PV to the grid causes 10kV line heavy overload, and the analysis result is more accurate and reliable; thus solving the technical problem that the prior art cannot determine the cause of equipment heavy overload. Brief Description of the Drawings

[0040] Figure 1 It is a schematic flowchart of the first embodiment of an analysis method for PV access causing 10kV line heavy overload provided in the embodiment of the present application;

[0041] Figure 2 It is a schematic flowchart of the second embodiment of an analysis method for PV access causing 10kV line heavy overload provided in the embodiment of the present application;

[0042] Figure 3 It is a schematic structural diagram of an embodiment of an analysis system for PV access causing 10kV line heavy overload provided in the embodiment of the present application. Detailed Embodiments

[0043] In order to enable those skilled in the art to better understand the solution of the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0044] Please refer to Figure 1 , an analysis method for PV access causing 10kV line heavy overload provided in the embodiment of the present application includes:

[0045] Step 101: Obtain the equipment ledger of the distribution network production system, the operation data of the 10kV distribution network line, and the metering underlying data of the PV user metering point;

[0046] It should be noted that the specific contents of obtaining the equipment ledger of the distribution network production system, the operation data of the 10kV distribution network line, and the metering data of PV users in this embodiment include:

[0047] Equipment ledger of the distribution network production system: Obtain the subordinate equipment ledger information through the distribution network production system, mainly including 10kV line name, number, line ID, line type, subordinate district bureau, power supply station, substation, line type, line current carrying capacity, etc.

[0048] Distribution network 10kV line operation data: 10kV line operation information is obtained by obtaining distribution network dispatching equipment operation data, mainly including line ID, subordinate district bureau, power supply station, substation, daily, monthly and annual maximum current, annual maximum current event, annual maximum load rate, annual average load and annual average load rate, etc.

[0049] Photovoltaic household metering data: Based on the photovoltaic user data of the marketing system, the metering system meter data is matched to obtain the underlying metering data of the photovoltaic user's metering point, mainly including: the photovoltaic household's electricity user number, subordinate metering meter (including online household meter and power generation household meter), subordinate district bureau, power supply station, user name, project name, photovoltaic installed capacity, access voltage level, grid-connected date, photovoltaic access substation, 10kV line name, distribution transformer name, etc.

[0050] Step 102: Correlate and match the equipment ledger and the operation data to obtain integrated data. After eliminating the integrated data according to the annual maximum current value, a 10kV line heavy overload list is screened out from the integrated data according to the preset annual maximum load rate;

[0051] It should be noted that, in this embodiment, the equipment ledger and the operating data are correlated and matched to obtain integrated data, and then the point where the operating current differs from the previous and next points by more than 40% is defined as a mutation point; after eliminating the data with the annual maximum current value of the mutation point in the integrated data, the annual maximum load rate of 80% to 100% in the integrated data is defined as a heavy load of the 10kV line, and the annual maximum load rate of more than 100% is defined as an overload, and the 10kV line heavy and overload list is obtained; specifically, the following steps are included:

[0052] 1) Data is associated and matched through the equipment ledger of the distribution network production system and the operation data of the distribution network 10kV line, with the line ID as the key field and the substation and 10kV line name as the auxiliary fields; (2) The data with the annual maximum current value as the mutation point of the 10kV line after association matching is eliminated (the difference between the operating current and the two points before and after is more than 40% is considered a mutation point); (3) For the 10kV line after association matching after eliminating the mutation point, the annual maximum load rate of 80% to 100% is defined as 10kV line overload; the annual maximum load rate of more than 100% is defined as overload; (4) The list of 10kV line overload and 10kV line overload is output by category, and the output fields include: line ID, subordinate district bureau, power supply station, substation, 10kV line name, line type, line current carrying capacity, annual maximum current value, annual maximum current time, and annual maximum load rate.

[0053] Step 103: After associating the 10 kV line overload list with the metering underlying data, obtain the electricity user numbers, grid connection dates, and current information of the subordinate metering tables of photovoltaic users whose grid connection dates are before the annual maximum current date under the 10 kV line.

[0054] It should be noted that in this embodiment, the metering data of photovoltaic users is associated with the overload and overloading lists of the 10 kV distribution network lines. Using the subordinate substation of the 10 kV line and the 10 kV line name as the key fields, and the subordinate district bureau, power supply station, and 10 kV line name as the auxiliary fields, data association is performed to obtain the installation capacity of medium and low-voltage photovoltaics under the 10 kV line, the electricity user numbers of photovoltaic users, the grid connection dates, the subordinate metering tables (including grid-connected household meters and power generation household meters), etc.; obtain the annual maximum current date of the 10 kV overloaded line, and automatically match the electricity user numbers of photovoltaic users whose grid connection dates are before the annual maximum current date under the 10 kV line, the installation capacity, and the current information of the metering tables (including grid-connected household meters and power generation household meters) on that day.

[0055] Step 104: Based on the electricity user number and current information, calculate the total grid-connected current of photovoltaics at the annual maximum current moment of the 10 kV line to obtain the metering auxiliary analysis result, and calculate the total grid-connected current of all photovoltaic users in the hour of the annual maximum current of the 10 kV line to obtain the electricity quantity auxiliary analysis result.

[0056] It should be noted that after obtaining the current information in Step 103, Step 104 mainly performs metering data auxiliary analysis and electricity quantity data auxiliary analysis.

[0057] Among them, the metering data auxiliary analysis includes: analyzing the annual maximum current moment of the 10 kV overloaded line, adding up the installation capacities of the grid connection dates before the annual maximum current date under the 10 kV line, and obtaining the power generation current and grid-connected current of all photovoltaic power generation household meters within that hour at the annual maximum current moment; eliminating the bad points where the grid-connected current is larger than the power generation current, and the points where the power generation current or grid-connected current of the photovoltaic user's installation capacity at 80% output is less than the metering table, and adding up the grid-connected currents of all photovoltaic users in that hour, the total grid-connected current of photovoltaics at the annual maximum current moment of the 10 kV line can be obtained, that is, the metering auxiliary analysis result is obtained.

[0058] The electricity quantity data auxiliary analysis includes: after obtaining the electricity quantity information of photovoltaic users whose grid connection dates are before the annual maximum current date under the 10 kV overloaded line, adding up the daily grid-connected electricity quantities of all photovoltaic users under the 10 kV line, and according to the daily irradiance effective time of 8 hours and the voltage level of 10 kV, using the formula W = PT = UIT, the total grid-connected current of all photovoltaic users in the hour of the annual maximum current can be calculated; that is, the electricity quantity auxiliary analysis result is obtained.

[0059] Step 105: Compare the annual maximum current of the 10kV line with the measurement auxiliary analysis result and the power quantity auxiliary analysis result respectively, and perform correlation matching on the two comparison results to obtain the first line list of equipment heavy overload caused by distributed photovoltaics.

[0060] This embodiment specifically includes the following steps:

[0061] Compare the annual maximum current of the 10kV line with the measurement auxiliary analysis result. If the total grid-connected current of the photovoltaic at the moment of the maximum current is greater than the preset annual maximum current value of the corresponding 10kV line, it is determined that the equipment is heavily overloaded due to measurement-assisted distributed photovoltaics, and the first list is obtained;

[0062] It should be noted that: Use the measurement data auxiliary analysis result to analyze the total grid-connected current of the photovoltaic at the moment of the annual maximum current of the 10kV line. If the total grid-connected current of the photovoltaic at the moment of the maximum current is greater than 80% of the annual maximum current of the 10kV line, it is determined that the equipment is heavily loaded due to measurement-assisted distributed photovoltaics; if the total grid-connected current of the photovoltaic at the moment of the maximum current is greater than 100% of the annual maximum current of the 10kV line, it is determined that the equipment is overloaded due to measurement-assisted distributed photovoltaics.

[0063] Compare the annual maximum current of the 10kV line with the power quantity auxiliary analysis result. If the total grid-connected current of the photovoltaic at the moment of the maximum current is greater than the preset annual maximum current value of the corresponding 10kV line, it is determined that the equipment is heavily overloaded due to power quantity-assisted distributed photovoltaics, and the second list is obtained;

[0064] It should be noted that: Use the power quantity data auxiliary analysis to analyze the total grid-connected current of all photovoltaic households at the hour of the annual maximum current of the 10kV line. If the total grid-connected current of all photovoltaic households at this hour is greater than 80% of the annual maximum current of the 10kV line, it is determined that the equipment is heavily loaded due to power quantity-assisted distributed photovoltaics; if the total grid-connected current of the photovoltaic at the moment of the maximum current is greater than 100% of the annual maximum current of the 10kV line, it is determined that the equipment is overloaded due to power quantity-assisted distributed photovoltaics.

[0065] Perform correlation matching on the first list and the second list to obtain the first line list of equipment heavy overload caused by distributed photovoltaics.

[0066] It should be noted that: Perform correlation matching on the measurement data auxiliary analysis result and the power quantity data auxiliary analysis result. If the 10kV line is determined to cause equipment heavy load due to distributed photovoltaics in both the measurement data auxiliary analysis result and the power quantity data auxiliary analysis result, it is defined that the 10kV line causes equipment heavy load due to distributed photovoltaics; if the 10kV line is determined to cause equipment overload due to distributed photovoltaics in both the measurement data auxiliary analysis and the power quantity data auxiliary analysis, it is defined that the 10kV line causes equipment overload due to distributed photovoltaics. Thus, the first line list of equipment heavy overload caused by distributed photovoltaics is obtained.

[0067] The above is the first embodiment of the analysis method for heavy overload of 10kV lines caused by photovoltaic access provided in the embodiments of this application. The following is the second embodiment of the analysis method for heavy overload of 10kV lines caused by photovoltaic access provided in the embodiments of this application.

[0068] Please refer to Figure 2 , the analysis method for heavy overload of 10kV lines caused by photovoltaic access provided in the embodiments of this application includes:

[0069] Step 201, obtain the equipment ledger of the distribution network production system, the operation data of the 10kV distribution network lines, and the metering underlying data of the photovoltaic user metering points;

[0070] Step 202, perform associated matching on the equipment ledger and the operation data to obtain integrated data. After eliminating data from the integrated data according to the annual maximum current value, screen out the 10kV line heavy overload list from the integrated data according to the preset annual maximum load rate;

[0071] Step 203, after performing data association on the 10kV line heavy overload list and the metering underlying data, obtain the electricity user numbers, grid connection dates, and current information of the subordinate metering meters of the photovoltaic households whose grid connection dates are before the annual maximum current date under the 10kV line;

[0072] Step 204, based on the electricity user number and the current information, calculate the total grid-connected current of the photovoltaic at the moment of the annual maximum current of the 10kV line to obtain the metering auxiliary analysis result, and calculate the total grid-connected current of all photovoltaic households in the hour of the annual maximum current of the 10kV line to obtain the electricity quantity auxiliary analysis result;

[0073] Step 205, compare the annual maximum current of the 10kV line with the metering auxiliary analysis result and the electricity quantity auxiliary analysis result respectively, and perform associated matching on the two comparison results to obtain the first line list of equipment heavy overload caused by distributed photovoltaic.

[0074] The steps 201-205 of this embodiment are the same as the steps 101-105 of the above embodiment. Please refer to the description of steps 101-105 and will not be repeated here.

[0075] Step 206, determine that all lines after removing the 10kV line from the 10kV line heavy overload list are caused by natural load growth resulting in heavy overload of the 10kV line, and obtain the second line list.

[0076] It should be noted that in addition to analyzing the line list of equipment heavy overload caused by distributed photovoltaic, this embodiment also determines that all lines after removing the 10kV line list from the 10kV line heavy overload list are caused by natural load growth resulting in heavy overload of the 10kV line, and obtains the second line list.

[0077] Step 207, generate a list report of the first line list and the second line list in units of cities or districts; and generate a curve chart of the power and current information of the photovoltaic power users' online meters and power generation meters on the highest current day of the year for each 10kV heavily overloaded line.

[0078] It should be noted that this embodiment respectively presents the number and specific list of 10kV heavily overloaded lines caused by natural load growth in the entire city and each district and 10kV heavily overloaded lines caused by distributed photovoltaics, and presents the electricity and current information of the photovoltaic power users' grid-connected meters and power generation meters on the highest current day of the year for each 10kV heavily overloaded line in a curve graph.

[0079] The above is Example 2 of an analysis method for 10kV line heavy overload caused by photovoltaic access provided in an embodiment of the present application. The following is an analysis method for 10kV line heavy overload caused by photovoltaic access provided in an embodiment of the present application.

[0080] See also Figure 3 , an analysis system for 10kV line heavy overload caused by photovoltaic access provided in an embodiment of the present application includes:

[0081] The acquisition unit 301 is used to acquire the equipment ledger of the distribution network production system, the operation data of the distribution network 10kV line and the metering underlying data of the photovoltaic user metering point;

[0082] The first matching unit 302 is used to associate and match the equipment ledger and the operation data to obtain integrated data, and after eliminating the integrated data according to the annual maximum current value, filter out the 10kV line heavy overload list from the integrated data according to the preset annual maximum load rate;

[0083] The second matching unit 303 is used to associate the 10kV line heavy overload list with the metering bottom data, and obtain the electricity user number, grid connection date and current information of the subordinate meter of the photovoltaic household whose grid connection date under the 10kV line is before the annual maximum current day;

[0084] The calculation unit 304 is used to calculate the total grid-connected current of the photovoltaic power plant at the time of the annual maximum current of the 10 kV line based on the electricity user number and the current information, and obtain the auxiliary analysis result of metering, and calculate the total grid-connected current of all photovoltaic users at the hour of the annual maximum current of the 10 kV line, and obtain the auxiliary analysis result of electricity;

[0085] The first analysis unit 305 is used to compare the annual maximum current of the 10kV line with the metering auxiliary analysis result and the power auxiliary analysis result respectively, and associate and match the two comparison results to obtain a first line list of distributed photovoltaic devices that cause heavy overload.

[0086] 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 foregoing method embodiments and will not be elaborated herein.

[0087] The terms "first", "second", "third", "fourth", etc. in the specification of this application and the above-mentioned drawings are used to distinguish similar objects and do not necessarily describe a specific order or sequence. It should be understood that the data used in this way can be interchanged under appropriate circumstances so that the embodiments of this application described herein can be implemented in an order different from those illustrated or described herein. In addition, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product or device comprising a series of steps or units does not necessarily have to be limited to those steps or units clearly listed, but may include other steps or units not clearly listed or inherent to these processes, methods, products or devices.

[0088] It should be understood that in this application, "at least one (item)" means one or more, and "a plurality" means two or more. "And / or" is used to describe the association relationship of associated objects and indicates that three relationships can exist. For example, "A and / or B" can mean: only A exists, only B exists, and both A and B exist at the same time. Among them, A and B can be singular or plural. The character " / " generally means that the associated objects before and after are in an "or" relationship. "At least one (one) of the following" or similar expressions refer to any combination of these items, including any combination of single item (one) or plural items (ones). For example, at least one (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.

[0089] In the several embodiments provided by this 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 merely illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For example, 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 displayed or discussed coupling or direct coupling or communication connection to each other can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be in electrical, mechanical or other forms.

[0090] The unit described as a separation component may or may not be physically separated. The component shown as a unit may or may not be a physical unit, that is, it may be located in one place or distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0091] In addition, each functional unit in various embodiments of the present application may be integrated in a processing unit, may exist separately as individual physical units, or two or more units may be integrated in one unit. The above-mentioned integrated units can be implemented in the form of hardware or in the form of software functional units.

[0092] If the above-mentioned 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 such an understanding, the technical solution of the present application, in essence, or the part that contributes to the prior art, or all or part of this technical solution, can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in various embodiments of the present application. The aforementioned storage medium includes: USB flash drives, mobile hard disks, read-only memories (English full name: Read-Only Memory, English abbreviation: ROM), random access memories (English full name: Random Access Memory, English abbreviation: RAM), magnetic disks or optical discs and other various media that can store program codes.

[0093] As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of various embodiments of the present application.

Claims

1. An analysis method for the heavy overload of 10kV lines caused by photovoltaic access, characterized in that, it includes: S1. Obtain the equipment ledger of the distribution network production system, the operation data of the 10kV distribution network lines, and the metering underlying data of the photovoltaic user metering points; S2. Perform correlation matching on the equipment ledger and the operation data to obtain integrated data. After data elimination on the integrated data according to the annual maximum current value, screen out the 10kV line heavy overload list from the integrated data according to the preset annual maximum load rate; S3. After performing data association on the 10kV line heavy overload list and the metering underlying data, obtain the electricity user numbers, grid connection dates, and current information of the subordinate metering tables of the photovoltaic users whose grid connection dates are before the annual maximum current date under the 10kV line; S4. Based on the electricity user numbers and the current information, calculate the total grid-connected current of the photovoltaic at the moment of the annual maximum current of the 10kV line to obtain the metering auxiliary analysis result, and calculate the total grid-connected current of all photovoltaic users in the hour of the annual maximum current of the 10kV line to obtain the electricity quantity auxiliary analysis result; S5. Compare the annual maximum current of the 10kV line with the metering auxiliary analysis result and the electricity quantity auxiliary analysis result respectively, and perform correlation matching on the two comparison results to obtain the first line list of equipment heavy overload caused by distributed photovoltaics; Among them, step S4 includes: Calculate all the installed capacities before the annual maximum current date, and the generated current and grid-connected current of the metering tables of all photovoltaic power generation households in the hour to which the annual maximum current moment belongs; After eliminating the points where the grid-connected current is greater than the generated current and the points where the output of 80% of the installed capacity is less than the generated current and the grid-connected current, superimpose the grid-connected currents of all photovoltaic users in the hour to obtain the metering auxiliary analysis result; After obtaining the electricity quantity information of the photovoltaic electricity users whose grid connection dates are before the annual maximum current date under the 10kV heavy overload line, accumulate the daily grid-connected electricity quantities of all photovoltaic electricity users under the 10kV line, and use the product of the accumulated electricity quantity and the effective daily irradiation time and the voltage level as the electricity quantity auxiliary analysis result.

2. The analysis method for the heavy overload of 10kV lines caused by photovoltaic access according to claim 1, characterized in that, after step S5, it further includes: All the lines after removing the 10kV line from the 10kV line heavy overload list are determined to be caused by the natural load growth leading to the heavy overload of the 10kV line, and a second line list is obtained.

3. The analysis method for the heavy overload of 10kV lines caused by photovoltaic access according to claim 2, characterized in that, after step S5, it further includes: Generate a list report of the first line list and the second line list in units of cities or districts; and generate a curve chart of the electricity quantity and current information of the metering grid-connected household tables and power generation household tables of photovoltaic electricity users on the day of the annual maximum current of each 10kV heavy overload line.

4. The analysis method for the heavy overload of 10kV lines caused by photovoltaic access according to claim 1, characterized in that, After the integrated data is subjected to data elimination according to the annual maximum current value, a list of heavy overloads of 10kV lines is selected from the integrated data according to a preset annual maximum load rate, specifically including: Points where the operating current differs from the previous and next points by more than 40% are defined as mutation points; After eliminating the data with the annual maximum current value as a mutation point in the integrated data, an annual maximum load rate of 80% - 100% in the integrated data is defined as heavy load of 10kV lines, and an annual maximum load rate of more than 100% is defined as overload, obtaining the list of heavy overloads of 10kV lines.

5. The analysis method for photovoltaic access causing heavy overload of 10kV lines according to claim 1, characterized in that, Step S5 specifically includes: Comparing the annual maximum current of the 10kV line with the metering auxiliary analysis result, and determining that the total photovoltaic grid-connected current at the moment of the maximum current is greater than the preset annual maximum current value of the corresponding 10kV line, and determining that the metering auxiliary distributed photovoltaic causes equipment heavy overload, obtaining a first list; Comparing the annual maximum current of the 10kV line with the power quantity auxiliary analysis result, and determining that the total photovoltaic grid-connected current at the moment of the maximum current is greater than the preset annual maximum current value of the corresponding 10kV line, and determining that the power quantity auxiliary distributed photovoltaic causes equipment heavy overload, obtaining a second list; Associating and matching the first list and the second list to obtain a first line list of distributed photovoltaic causing equipment heavy overload.

6. An analysis system for photovoltaic access causing heavy overload of 10kV lines, characterized in that, including: An acquisition unit for acquiring the equipment ledger of the distribution network production system, the operation data of the 10kV lines of the distribution network, and the metering underlying data of the photovoltaic user metering points; A first matching unit for associating and matching the equipment ledger and the operation data to obtain integrated data, performing data elimination on the integrated data according to the annual maximum current value, and screening out a list of heavy overloads of 10kV lines from the integrated data according to a preset annual maximum load rate; A second matching unit for, after performing data association on the list of heavy overloads of 10kV lines and the metering underlying data, acquiring the user numbers of photovoltaic users whose grid connection dates are before the annual maximum current date under the 10kV line, the grid connection dates, and the current information of the subordinate metering meters; A calculation unit for calculating the total photovoltaic grid-connected current at the moment of the annual maximum current of the 10kV line based on the user number and the current information to obtain a metering auxiliary analysis result, and calculating the total grid-connected current of all photovoltaic users in the hour of the annual maximum current of the 10kV line to obtain a power quantity auxiliary analysis result; A first analysis unit for comparing the annual maximum current of the 10kV line with the metering auxiliary analysis result and the power quantity auxiliary analysis result respectively, and associating and matching the two comparison results to obtain a first line list of distributed photovoltaic causing equipment heavy overload; Among them, the calculation unit is specifically used for: Calculating all the installed capacities before the annual maximum current date, and the generated current and grid-connected current of the metering meters of all photovoltaic power generation users in the hour to which the annual maximum current moment belongs. After removing the points where the grid-connected current is greater than the generated current and the points where the output at 80% of the declared installation capacity is less than the generated current and the grid-connected current, the grid-connected currents of all hours belonging to the photovoltaic households are superimposed to obtain the metering auxiliary analysis result; After obtaining the power consumption information of photovoltaic users whose grid connection dates are before the annual maximum current date under the 10kV heavy overload line, the daily grid-connected power of all photovoltaic users under the 10kV line is accumulated, and the product of the accumulated power and the effective daily irradiation time and the voltage level is used as the power auxiliary analysis result.

7. The analysis system for heavy overload of 10kV line caused by photovoltaic access according to claim 6, characterized in that, further comprising: a second analysis unit; The second analysis unit is configured to determine that all the lines after removing the 10kV line from the 10kV line heavy overload list are caused by natural load growth resulting in the heavy overload of the 10kV line, so as to obtain a second line list.

8. The analysis system for heavy overload of 10kV line caused by photovoltaic access according to claim 7, characterized in that, further comprising: a generation unit; The generation unit is configured to generate a list report of the first line list and the second line list in units of city or district; and generate a curve chart of the power and current information of the metering grid-connected household meter and the generated household meter of photovoltaic users on the annual maximum current date of each 10kV heavy overload line.

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