CN114243686B - Intelligent analysis method and system for meeting access power points of medium-voltage users - Google Patents
Intelligent analysis method and system for meeting access power points of medium-voltage users Download PDFInfo
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- CN114243686B CN114243686B CN202111477233.7A CN202111477233A CN114243686B CN 114243686 B CN114243686 B CN 114243686B CN 202111477233 A CN202111477233 A CN 202111477233A CN 114243686 B CN114243686 B CN 114243686B
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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
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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
- 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
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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
- 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]
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Abstract
The invention provides an intelligent analysis method for meeting the requirement of a medium-voltage user on access to a power supply point, which comprises the steps of obtaining a user report installation point coordinate and a corresponding user electricity report installation grid in a preset distribution network grid level model; detecting the current situation wiring margin in the user telegraph installation grid, the existing ring main unit and the existence condition of a standby angle in the existing ring main unit; and screening lines in the current wiring or the new target wiring of the transformer substation according to the detection result, and taking a certain number of existing ring main units or newly-built ring main units on all the selected lines as user access power points. The method and the device are time-saving and labor-saving, ensure the accuracy of the selection of the access power points, and solve the problems that the time and labor are wasted and the effect is difficult to guarantee when the user selects the access power points through the existing manual experience.
Description
Technical Field
The invention relates to the technical field of power grid planning, in particular to an intelligent analysis method and system for meeting the requirement of medium-voltage user access power supply points.
Background
After the power consumer submits the business expansion application to the power department, the power department provides the reporting service for the power consumer according to the characteristics and properties of the consumer, so that the demand standard of the consumer is met, various power requirements of the consumer are met, and therefore, the selection of a reasonable access power point is an important link in the design of a customer power supply scheme. In order to provide a rapid and accurate optimal access power supply point and access mode for users, provide data support for subsequent power supply scheme programming, shorten the industrial expansion site investigation and power supply scheme programming time, save cost and improve the overall working efficiency, and a set of digital intelligent point selection scheme is urgently needed.
Currently, the existing user access power point selection process generally includes the following aspects: 1) The planner observes the nearby station houses from the GIS system according to the user report position; 2) Comprehensively analyzing whether a residual interval exists in the station building or not through a station building wiring diagram and a single line diagram of a dispatching operation management system; 3) It is verified by various means whether the station room interval has been applied for use, and finally the access point selection scheme is confirmed.
However, the existing user access power point selection method has the defects that: (1) the selection time is too long, and the efficiency is too low: frequently operating a plurality of systems, confirming data back and forth among the systems, confirming a final scheme online and offline, and being time-consuming in process and low in working efficiency; (2) excessively relies on manual judgment and is prone to error: manually judging nearby accessible station rooms, manually judging whether station room intervals are available, manually selecting a final selection scheme, manually judging that the dependence is too heavy, and affecting the overall progress once a certain link goes wrong.
Therefore, research and development of intelligent analysis technology of a user access power point is needed to change the traditional planning mode relying on manual drawing and time and labor waste in calculation, promote the planning mode to change from a manual programming mode to an intelligent generation mode, and promote the scientific development of the power distribution network.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide the intelligent analysis method and the intelligent analysis system for the access power points of the medium-voltage users, which are time-saving and labor-saving, can ensure the accuracy of the selection of the access power points, and are used for solving the problems that the time and labor are wasted and the effect is difficult to ensure when the user access power points are selected by the existing manual experience.
In order to solve the technical problems, the embodiment of the invention provides an intelligent analysis method for meeting the requirement of a medium-voltage user on access to a power supply point, which comprises the following steps:
step S1, acquiring user report point coordinates and corresponding user telegraph loading grids in a preset distribution network grid level model;
step S2, detecting the current situation wiring margin in the user telegraph installation grid, the existing ring main unit and the existence condition of a standby angle in the existing ring main unit;
and step S3, screening lines in the current wiring or the new target wiring of the transformer substation according to the detection result, and taking a certain number of existing ring main units or newly-built ring main units on all the selected lines as user access power points.
The step S3 specifically includes:
if the current connection has a margin and the existing ring main units have a standby angle, selecting the existing lines meeting the screening and combining conditions of the first preset lines in the current connection, and screening all the existing ring main units on each selected existing line to select the existing ring main units on each selected existing line meeting the screening and combining conditions of the first preset ring main units;
Acquiring the coordinates of all the selected existing ring main units, and respectively calculating the distance from each selected existing ring main unit to the user report point coordinates by combining the user report point coordinates;
determining the segmented cables connected to the corresponding existing lines of all the selected existing ring main units, acquiring a coordinate set formed by coordinates of preset sampling points on the segmented cable connected to each selected existing ring main unit, and further combining the coordinates of the user reporting points to respectively calculate the shortest distance from the segmented cable connected to each selected existing ring main unit to the coordinates of the user reporting points;
based on the distance from each selected existing ring main unit to the user report point coordinate and the shortest distance from the corresponding segmented cable connected with the selected existing ring main unit to the user report point coordinate, a distance set is formed, the distance set is ordered according to a preset rule, and a certain number of existing ring main units meeting a first preset access condition are screened out from all selected existing ring main units according to the ordered distance set to serve as user access power points.
The specific steps of selecting a certain number of existing ring main units meeting preset conditions as user access power points from all the selected existing ring main units according to the ordered distance sets, wherein the specific steps include:
Comparing the distance from each selected existing ring main unit to the user reporting point coordinate with the shortest distance from the corresponding segmented cable to the user reporting point coordinate;
if the distance from one selected existing ring main unit to the user reporting point coordinate is smaller than or equal to the shortest distance from the corresponding segmented cable connected with the selected existing ring main unit to the user reporting point coordinate, storing the distance from the selected existing ring main unit to the user reporting point coordinate into the distance set;
if the distance from one selected existing ring main unit to the user reporting point coordinate is greater than the shortest distance from the corresponding segmented cable to the user reporting point coordinate, storing the shortest distance from the corresponding segmented cable to the user reporting point coordinate into the distance set;
and sorting the distance sets according to a rule from small to large, selecting six minimum distances from the sorted distance sets, and further acquiring corresponding six existing ring main units from all the selected existing ring main units according to the six minimum distances, wherein the six corresponding existing ring main units are used as user access power points.
Wherein the method further comprises:
if the distance from a user access power point to the coordinates of the user reporting point is greater than the shortest distance between the corresponding segmented cable and the coordinates of the user reporting point, the user reporting point can be accessed by directly cutting the corresponding segmented cable.
Wherein, the step S3 further includes:
if the current connection has a margin and the existing ring main unit has no standby angle, selecting an existing line meeting the screening and combining conditions of a second preset line from the current connection;
and obtaining the position of the newly-built ring main unit on each selected existing line according to the user report point coordinates, carrying out tangent plane calculation through the user report point coordinates and each selected existing line to obtain the distance from the tangent point on each selected existing line to the user report point coordinates, and further taking a certain number of newly-built ring main units meeting the second preset access condition as user access power points in all the positions of the newly-built ring main units according to the distance from the tangent point on each selected existing line to the user report point coordinates.
The specific steps of obtaining a certain number of newly-built ring main units meeting a second preset access condition as user access power points in all positions of the newly-built ring main units include:
Acquiring all positions which can be used for pre-installing a new ring main unit on each selected existing line, calculating the distances from all positions which can be used for storing a new ring main unit on each selected existing line to the coordinates of the user report points by combining the coordinates of the user report points, and further selecting two positions which can be used for pre-installing the new ring main unit with the minimum distance from the coordinates of the user report points on each selected existing line according to the distances from all positions which can be used for storing the new ring main unit on each selected existing line to the coordinates of the user report points;
determining the positions of two adjacent ring main units, which are selected on each selected existing line and can be used for preassembling the new ring main units, of the positions of the two adjacent ring main units on each selected existing line, and carrying out average value calculation on the positions of the two adjacent ring main units and the positions of the two adjacent ring main units on each selected existing line to obtain the positions of the two new ring main units on each selected existing line; the positions of the adjacent ring main units are the positions of the adjacent existing ring main units or the positions of the adjacent ring main units which can be used for preassembling the new ring main units;
drawing circles respectively by taking the coordinates of the user report points as center points and tangent with each selected existing line to obtain corresponding tangent points, and further calculating the distances from the tangent points on each selected existing line to the coordinates of the user report points respectively;
Sorting the distances from the tangent points on each selected existing line to the coordinates of the user report points according to the sequence from small to large, selecting two tangent points with the minimum distance from the coordinates of the user report points, and obtaining two corresponding selected existing lines as candidate lines according to the two selected tangent points;
and according to the positions of the two newly-built ring main units on each selected existing line, obtaining the positions of the four newly-built ring main units on the two candidate lines, and taking the newly-built ring main units on the four obtained positions as user access power points.
Wherein, the step S3 further includes:
if the current wiring is not provided with a margin, a transformer substation is enabled to newly output a target wiring, and a new output target line meeting the screening and combining conditions of a third preset line is selected from the new output target wiring of the transformer substation;
and obtaining the position of the newly-built ring main unit on each selected new target line according to the user report point coordinates, carrying out tangent plane calculation through the user report point coordinates and each selected new target line to obtain the distance from the tangent point on each selected new target line to the user report point coordinates, and further taking a certain number of newly-built ring main units meeting a third preset access condition as user access power points in all the positions of the newly-built ring main units according to the distance from the tangent point on each selected new target line to the user report point coordinates.
The specific steps of obtaining a certain number of newly-built ring main units meeting a third predetermined access condition as user access power points in all positions of the newly-built ring main units include:
acquiring all positions available for pre-installing a new ring main unit on each selected new output target line, calculating the distances from all positions available for storing a new ring main unit on each selected new output target line to the user report point coordinates by combining the user report point coordinates, and further selecting two positions available for pre-installing the new ring main unit with the minimum distance from the user report point coordinates on each selected new output target line according to the distances from all positions available for storing the new ring main unit on each selected new output target line to the user report point coordinates;
Determining the positions of two adjacent ring main units, which are selected on each selected new outgoing target line and can be used for preassembling the positions of the new ring main units, and carrying out average value calculation on the positions of the two adjacent ring main units, which are selected on each selected new outgoing target line and can be used for preassembling the new ring main units, to obtain the positions of two new ring main units on each selected new outgoing target line; the positions of the adjacent ring main units are adjacent positions which can be used for preassembling the new ring main units;
drawing circles respectively with the coordinates of the user report points as the center points and tangent to each selected new target line to obtain corresponding tangent points, and further calculating the distances from the tangent points on each selected new target line to the coordinates of the user report points respectively;
sorting the distances from the tangent points on each selected new target line to the coordinates of the user report points according to the sequence from small to large, selecting two tangent points with the minimum distance from the coordinates of the user report points, and obtaining two corresponding selected new target lines as candidate lines according to the two selected tangent points;
and according to the positions of the two newly-built ring main units on each selected new outgoing target line, obtaining the positions of the four newly-built ring main units on the two candidate lines, and taking the newly-built ring main units on the four obtained positions as user access power points.
The embodiment of the invention also provides an intelligent analysis system meeting the requirement of the medium-voltage user on the access power supply point, which comprises the following steps of;
the installation information acquisition unit is used for acquiring user installation point coordinates and corresponding user electricity installation grids in a preset distribution network grid level model;
the information state detection unit is used for detecting the current situation wiring margin in the user telegraph installation grid, the existing ring main unit and the existence condition of the standby angle in the existing ring main unit;
and the user access power point confirming unit is used for screening lines in the current-situation wiring or the new-outgoing target wiring of the transformer substation according to the detection result, and taking a certain number of existing ring main units or newly-built ring main units on all the selected lines as user access power points.
The embodiment of the invention has the following beneficial effects:
1. according to the invention, the previous manual operation of the multiple systems for switching to acquire data and on-line and off-line confirmation schemes is performed, so that the system can automatically acquire data and intelligently recommend alternative points, the working efficiency of planning personnel is greatly improved, time and labor are saved, and the accuracy of selecting the access power points is ensured;
2. the invention avoids the fact that the manual operation in the past is too dependent on personal experience judgment, can check the power supply relation in real time in the process of intelligent point selection of the system, improves the accuracy of a planning scheme, and further solves the problems that the time and the labor are wasted and the effect is difficult to guarantee when the user selects the power supply point through the manual experience.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that it is within the scope of the invention to one skilled in the art to obtain other drawings from these drawings without inventive faculty.
Fig. 1 is a flowchart of an intelligent analysis method for meeting the requirement of a medium-voltage user on access to a power supply point, which is provided by an embodiment of the invention;
fig. 2 is a schematic structural diagram of an intelligent analysis system satisfying access to a power point of a medium voltage user according to an embodiment of the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.
As shown in fig. 1, in an embodiment of the present invention, an intelligent analysis method for meeting the requirement of a medium voltage user on access to a power supply point is provided, where the method includes the following steps:
step S1, acquiring user report point coordinates and corresponding user telegraph loading grids in a preset distribution network grid level model;
Step S2, detecting the current situation wiring margin in the user telegraph installation grid, the existing ring main unit and the existence condition of a standby angle in the existing ring main unit;
and step S3, screening lines in the current wiring or the new target wiring of the transformer substation according to the detection result, and taking a certain number of existing ring main units or newly-built ring main units on all the selected lines as user access power points.
The specific process is that before step S1, an electronic map of the whole city is pre-installed, and a distribution network grid level model of the whole city is pre-set.
The distribution network grid level model is built in a layered mode according to voltage levels, and uniform coordination of distribution network management of different voltage levels is achieved. The geographic boundaries and the electric wiring of each level grid are mutually independent and geographically contained layer by layer, and standard wiring is physically formed to form a clear and uniform power supply structure and management main body.
The distribution network grid level model comprises a high-voltage grid (L1), a medium-voltage grid (L2) and a low-voltage grid (L3); wherein the high-voltage grid (L1) is formed by 2-4 source substations, and the boundary refers to an area grid surrounded by a plurality of trunk roads or natural barriers, and is not suitable for exceeding 100 square kilometers in principle; the medium-voltage grid (L2) is directly and independently powered by a plurality of groups of standard wiring, each L2-level grid is geographically composed of a plurality of blocks, and is a power supply grid formed by surrounding municipal roads. The load development characteristics (load maturation, rapid development or uncertainty of development) within each grid should be relatively close; and the low-voltage grid (L3) is a low-voltage distribution network power supply range formed by each distribution transformer area.
The user logs in the reporting interface to fill in the loading reporting information, and according to the loading reporting information, the medium-voltage grid corresponding to the loading reporting information is automatically determined in the distribution network grid level model, namely, the L2 grid where the demand point is located is determined according to the position of the user reporting demand point; wherein the load package information includes, but is not limited to, load properties, package capacity, package type, package duration, user name, and package location; the user parameter configuration includes information such as conversion of user reporting capacity into electricity load discount.
In the medium voltage grid, the user can perform drawing operations of red lines and internal wiring. At this time, the user responds to the drawing operation of the user red line and the internal wiring in the medium-voltage grid, so as to obtain the current grid distribution network analysis information of the user telegraph installation grid and the corresponding grid. The grid current distribution network analysis information comprises current wiring conditions and target wiring conditions in a user telegraph grid; the current wiring condition comprises a first feeder line group list, a loading capacity, a high-limit current value, a maximum load, a contact point position, whether a standby angle exists or not and the like; the target wiring conditions include a second feeder group list, a capacity, a high-limit current value, and the like.
It can be understood that the analysis information of the current grid distribution network can simplify the processing, inherit the existing projects (including planning, grinding, planning, construction and grid construction) of the grid forward and locate in the electronic map.
Therefore, in step S1, the coordinates of the user reporting points are obtained, and the corresponding user telegraph packaging grid in the grid level model of the upper distribution network can be determined according to the coordinates of the user reporting points.
In step S2, the current connection margin in the telegraph installation grid of the user, the existing ring main unit, and the existence of the standby angle in the existing ring main unit are detected, so that judgment and screening are performed according to the three conditions, and finally, the alternative positions of the plurality of access power points are screened.
In step S3, according to the detection results of the three conditions, the current connection or the new target connection of the transformer substation is screened, and a certain number of existing ring main units or newly-built ring main units are taken as user access power points on all the selected lines. The specific analysis process is as follows:
(1) The current situation wiring has margin, and current looped netowrk cabinet exists and has reserve angle:
(11) If the current connection has a margin, and the existing ring main units have a standby angle, in the current connection, selecting the existing lines meeting the screening and combining conditions of the first preset line, and screening all the existing ring main units on each selected existing line to select the existing ring main units on each selected existing line meeting the screening and combining conditions of the first preset ring main unit.
At this time, the first predetermined line screening combination conditions include a first line screening condition, a second line screening condition, a third line screening condition, and a fourth line screening condition.
The first line screening condition is that the line is already in the present wire;
the second line screening condition is that the sum of the line capacity and the load demand is less than or equal to the product of the maximum total capacity of the line and a preset line adjustment coefficient; wherein load demand (kW) =projected load volume (kVA) ×conversion factor; the conversion coefficient takes the value: 60% (industry), 50% (business), 35% (resident), 90% (charging pile), 40% (others); the maximum total capacity of the line takes the value: 10000kVA (pure industry), 12000kVA (pure business), 15000kVA (pure resident), 8000kVA (pure fast charging pile), and the mixed circuit is distributed according to the proportion of different property loads; the default value of the first preset adjustment coefficient is 1.0, and the value range is 0.7-1.3, so that manual adjustment is allowed;
the third line screening condition is that the line automation coverage rate is classified according to the corresponding power supply area and the corresponding requirement is met; the power supply areas comprise an A+ type power supply area, an A type power supply area and a B type power supply area in a classified mode; the A+ type power supply area meets the requirement that the coverage rate of the three remote point nodes of the line is more than or equal to 50%; the class A power supply area meets the requirement that the coverage rate of the three remote point nodes of the line is more than or equal to 40%; the B-type power supply area meets the requirement that the coverage rate of the three remote point nodes of the line is more than or equal to 30%;
The fourth line screening condition is that heavy overload does not exist during peak load of the transformer station to which the line belongs.
At this time, the first predetermined ring main unit screening combination condition includes a first ring main unit screening condition and a second ring main unit screening condition.
The first ring main unit screening condition is that the ring main units exist and have a standby angle;
the second ring main unit screening conditions are classified according to the corresponding power supply areas, and the load characteristics, the load demands, the access capacity and the medium-voltage user number meet the corresponding requirements; the requirements of the A+ type power supply area include: when the load characteristics are industrial, the load demand is less than or equal to 2MW, the preset load adjustment coefficient, the access capacity is less than or equal to 3500kVA, the preset capacity adjustment coefficient and the medium voltage user number is less than or equal to 10; when the load characteristic is commercial, the load demand is less than or equal to 2MW, the load adjustment coefficient, the access capacity is less than or equal to 4000kVA, the capacity adjustment coefficient and the medium voltage user number are less than or equal to 10; when the load characteristic is resident, the load demand is less than or equal to 1.5MW, the load adjustment coefficient, the access capacity is less than or equal to 4500kVA, the capacity adjustment coefficient and the medium-voltage user number are less than or equal to 800;
the requirements achieved by the class a and class B power supply regions include: when the load characteristic is industrial, the load demand is less than or equal to 2MW, the load adjustment coefficient, the access capacity is less than or equal to 3500kVA, the capacity adjustment coefficient, the medium voltage user stock is less than or equal to 10, and the medium voltage user number is increased by less than or equal to 10; when the load characteristic is commercial, the load demand is less than or equal to 2MW, the load adjustment coefficient, the access capacity is less than or equal to 4000kVA, the capacity adjustment coefficient, the medium voltage user stock is less than or equal to 10, and the medium voltage user number is increased by less than or equal to 10; when the load characteristic is resident, the load demand is less than or equal to 1.5MW, the load adjustment coefficient, the access capacity is less than or equal to 5500kVA, the capacity adjustment coefficient, the medium voltage user stock is less than or equal to 1000, and the medium voltage user number is newly increased by less than or equal to 1000.
It should be noted that the load adjustment coefficient defaults to 1.0, and the value range is 1.0-1.2, allowing manual adjustment; the capacity adjustment coefficient defaults to 1.0, and the value range is 1.0-1.3, and manual adjustment is allowed.
(12) And acquiring the coordinates of all the selected existing ring main units, and respectively calculating the distance from each selected existing ring main unit to the user report point coordinates by combining the user report point coordinates.
At this time, the distance formula is utilized by the coordinates of the selected existing ring main unit and the coordinates of the user report point:and calculating to obtain the distance from each selected existing ring main unit to the coordinates of the user report point.
(13) Determining the segmented cables connected with all the selected existing ring main units in the corresponding existing lines, acquiring a coordinate set formed by coordinates of preset sampling points on the segmented cable connected with each selected existing ring main unit, and further combining the coordinates of the user reporting points to respectively calculate the shortest distance from the segmented cable connected with each selected existing ring main unit to the coordinates of the user reporting points.
At this time, the shortest distance from the corresponding segmented cable connected to each selected existing ring main unit to the coordinates of the user reporting point is calculated to determine whether the user reporting point to the drop foot of the segment is contained in each segmented cable.
(14) Based on the distance from each selected existing ring main unit to the user report point coordinate and the shortest distance from the corresponding segmented cable connected with the selected existing ring main unit to the user report point coordinate, a distance set is formed, the distance set is ordered according to a preset rule, and a certain number of existing ring main units meeting a first preset access condition are screened out from all selected existing ring main units according to the ordered distance set to serve as user access power points.
At this time, firstly, comparing the distance from each selected existing ring main unit to the user reporting point coordinate with the shortest distance from the corresponding segmented cable connected with the selected existing ring main unit to the user reporting point coordinate;
secondly, if the distance from one selected existing ring main unit to the user reporting point coordinate is smaller than or equal to the shortest distance from the corresponding segmented cable connected with the selected existing ring main unit to the user reporting point coordinate, storing the distance from the selected existing ring main unit to the user reporting point coordinate into the distance set;
then, if the distance from one selected existing ring main unit to the user reporting point coordinate is greater than the shortest distance from the corresponding segmented cable to the user reporting point coordinate, storing the shortest distance from the corresponding segmented cable to the user reporting point coordinate into the distance set;
And finally, sorting the distance sets according to a rule from small to large, selecting six minimum distances from the sorted distance sets, and further acquiring corresponding six existing ring main units from all the selected existing ring main units according to the six minimum distances, wherein the six existing ring main units are used as user access power points.
(15) If the distance from a user access power point to the coordinates of the user reporting point is greater than the shortest distance between the corresponding segmented cable and the coordinates of the user reporting point, the user reporting point can be accessed by directly cutting the corresponding segmented cable.
In one embodiment, according to the coordinates of the user report points, the existing line meeting the conditions is obtained for the L2 grid through the following four condition screening in table 1:
TABLE 1
On the basis of the current situation wiring screening result of the last step, continuously screening public ring main units meeting the following conditions in the selected existing lines:
1) The loop-in loop-out line number (standby angle) is enough;
2) According to the classification of the power supply area and the load characteristics, the load demand, the access capacity and the medium voltage user number meet the requirements of the following table 2:
TABLE 2
Note that: the load adjustment coefficient defaults to 1.0, the value range is 1.0-1.2, and manual adjustment is allowed; the capacity adjustment coefficient defaults to 1.0, and the value range is 1.0-1.3, and manual adjustment is allowed.
Using distance formulaAnd calculating the distances between all ring main units meeting the access condition and the user reporting point.
By calculating whether each segmented cable contains a drop from the user's reporting point to the segment. If the points meeting the conditions calculate the distance from the report point to the drop foot, the shortest distance is selected as the distance from the cable to the line, and the first 6 ring main units with the shortest distances are selected as the user access power points by sequencing from the near to the far distances.
At this time, when the shortest path from the user report point to the ring main unit is larger than the distance from the user report point to the cable, the distance from the user report point to the cable is selected as a primary selection point, and the user report point is directly cut from the cable for access; when the shortest path from the user reporting point to the ring main unit is smaller than or equal to the distance from the user reporting point to the cable, the cable is cut and connected without consideration.
(2) The current situation wiring has margin, and current looped netowrk cabinet exists but does not have the spare angle:
(21) And if the current connection has a margin and the existing ring main unit has no standby angle, selecting an existing line meeting the screening and combining conditions of the second preset line from the current connection.
At this time, the second predetermined line screening combination condition includes a fifth line screening condition; the fifth line screening condition is that the line node +1 is less than or equal to the maximum node number. The maximum node number of the line is as follows: the maximum node number of the A+ type power supply area is 6, the maximum node number of the A type power supply area is 7, the maximum node number of the B type power supply area is 8, and the maximum node number allows manual adjustment of default. It should be noted that the line node is the location of the ring main unit.
(22) And obtaining the position of the newly-built ring main unit on each selected existing line according to the user report point coordinates, carrying out tangent plane calculation through the user report point coordinates and each selected existing line to obtain the distance from the tangent point on each selected existing line to the user report point coordinates, and further taking a certain number of newly-built ring main units meeting the second preset access condition as user access power points in all the positions of the newly-built ring main units according to the distance from the tangent point on each selected existing line to the user report point coordinates.
At this time, firstly, all positions which can be used for pre-installing a new ring main unit on each selected existing line are obtained, and the positions which can be used for storing the new ring main unit on each selected existing line are calculated by combining the user report point coordinates, and the distances from the positions which can be used for storing the new ring main unit on each selected existing line to the user report point coordinates are further calculated according to the distances from the positions which can be used for storing the new ring main unit on each selected existing line to the user report point coordinates, and two positions which have the minimum distance from the positions to the user report point coordinates and can be used for pre-installing the new ring main unit are selected on each selected existing line;
Secondly, determining the positions of two adjacent ring main units, which are selected on each selected existing line and can be used for preassembling the new ring main units, of the positions of the two adjacent ring main units on each selected existing line, and carrying out average value calculation on the positions of the two adjacent ring main units and the positions of the two adjacent ring main units on each selected existing line to obtain the positions of the two new ring main units on each selected existing line; the positions of the adjacent ring main units are the positions of the adjacent existing ring main units or the positions of the adjacent ring main units which can be used for preassembling the new ring main units;
then, respectively drawing a circle by taking the coordinates of the user report point as a center point and carrying out tangent on each selected existing line to obtain corresponding tangent points, and further calculating the distance from the tangent points on each selected existing line to the coordinates of the user report point;
then, sorting the distances from the tangent points on each selected existing line to the coordinates of the user report points according to the sequence from small to large, selecting two tangent points with the minimum distance from the coordinates of the user report points, and obtaining two corresponding selected existing lines as candidate lines according to the two selected tangent points;
and finally, according to the positions of the two newly-built ring main units on each selected existing line, obtaining the positions of the four newly-built ring main units on the two candidate lines, and taking the newly-built ring main units on the four obtained positions as user access power points.
In one embodiment, the existing ring main unit of the current connection cannot meet the user access requirement, and the existing line which passes the screening in the L2 grid meets the condition of (line node+1 is less than or equal to the maximum node number) is aimed at. The maximum node number of the line is as follows: the maximum node number of the A+ type power supply area is 6, the maximum node number of the A type power supply area is 7, the maximum node number of the B type power supply area is 8, and the maximum node number allows manual adjustment of default.
Based on the existing wiring screening result of the previous step, the position available for preassembling the new ring main unit in each selected existing line is circularly acquired, and the section calculation is carried out on the position: firstly, calculating the distance from the position of each selected existing line, which can be used for preassembling a new ring main unit, to the user report point by using a distance formula through the position (longitude and latitude) of each selected existing line, which can be used for preassembling the new ring main unit, and the coordinates of the user report point, and selecting 2 nearest positions, which can be used for preassembling the new ring main unit, as candidate nodes according to the distance; secondly, for the above 2 candidate nodes, respectively, find their previous node (if the candidate node is the first point of the line, select the next node), according to the midpoint formula: x=x 1 +x 2 /2，y＝y 1 +y 2 And 2, calculating the positions of 2 newly-built ring main units in each selected existing line.
And drawing a circle through the coordinates of the user report points, cutting the circle with each selected existing line, calculating the distance from the tangent point on each selected existing line to the coordinates of the user report points, sequencing the distances, and selecting 2 selected existing lines with the nearest distance as candidate lines.
Searching the positions of 4 newly-built ring main units on 2 candidate lines, and taking the newly-built ring main units corresponding to the 4 positions as user access power points.
(3) The current wiring has no margin:
(31) And if the current wiring is not provided with a margin, the transformer substation is enabled to newly output the target wiring, and a new output target line meeting the screening and combining conditions of the third preset line is selected from the new output target wiring of the transformer substation.
At this time, the third predetermined line screening combination conditions include a sixth line screening condition, a seventh line screening condition, an eighth line screening condition, and a ninth line screening condition.
The sixth line screening condition is that the line does not exist in the current wiring, and belongs to planning or new construction;
the seventh line screening condition is the same as the second line screening condition, and the sum of the line capacity and the load demand is smaller than or equal to the product of the maximum total capacity of the line and a preset line adjustment coefficient; wherein load demand (kW) =projected load volume (kVA) ×conversion factor; the conversion coefficient takes the value: 60% (industry), 50% (business), 35% (resident), 90% (charging pile), 40% (others); the maximum total capacity of the line takes the value: 10000kVA (pure industry), 12000kVA (pure business), 15000kVA (pure resident), 8000kVA (pure fast charging pile), and the mixed circuit is distributed according to the proportion of different property loads; the default value of the first preset adjustment coefficient is 1.0, and the value range is 0.7-1.3, so that manual adjustment is allowed;
The eighth line screening condition is the same as the third line screening condition, and the line automation coverage rate is classified according to the corresponding power supply area to meet the corresponding requirement; the power supply areas comprise an A+ type power supply area, an A type power supply area and a B type power supply area in a classified mode; the A+ type power supply area meets the requirement that the coverage rate of the three remote point nodes of the line is more than or equal to 50%; the class A power supply area meets the requirement that the coverage rate of the three remote point nodes of the line is more than or equal to 40%; the B-type power supply area meets the requirement that the coverage rate of the three remote point nodes of the line is more than or equal to 30%;
the ninth line screening condition is the same as the fourth line screening condition, which is that there is no heavy overload during peak load of the substation to which the line belongs.
(32) And obtaining the position of the newly-built ring main unit on each selected new target line according to the user report point coordinates, carrying out tangent plane calculation through the user report point coordinates and each selected new target line to obtain the distance from the tangent point on each selected new target line to the user report point coordinates, and further taking a certain number of newly-built ring main units meeting a third preset access condition as user access power points in all the positions of the newly-built ring main units according to the distance from the tangent point on each selected new target line to the user report point coordinates.
At this time, firstly, all positions available for pre-installing a new ring main unit on each selected new output target line are obtained, and the positions available for storing a new ring main unit on each selected new output target line are calculated by combining the user report point coordinates, and the distances from all positions available for storing a new ring main unit on each selected new output target line to the user report point coordinates are further calculated according to the distances from all positions available for storing a new ring main unit on each selected new output target line to the user report point coordinates, and two positions available for pre-installing a new ring main unit with the minimum user report point coordinate distances are selected on each selected new output target line;
secondly, determining the positions of two adjacent ring main units at the positions which can be used for preassembling the new ring main units on each selected new outgoing target line, and carrying out average value calculation on the positions of the two adjacent ring main units at the positions which can be used for preassembling the new ring main units on each selected new outgoing target line and the positions of the two newly-built ring main units on each selected new outgoing target line to obtain the positions of the two newly-built ring main units on each selected new outgoing target line; the positions of the adjacent ring main units are adjacent positions which can be used for preassembling the new ring main units;
then, respectively drawing a circle by taking the coordinates of the user report point as a center point and tangent with each selected new target line to obtain corresponding tangent points, and further calculating the distances from the tangent points on each selected new target line to the coordinates of the user report point;
Then, sorting the distances from the tangent point on each selected new target line to the coordinates of the user report point according to the sequence from small to large, selecting two tangent points with the minimum distance from the coordinates of the user report point, and obtaining two corresponding selected new target lines as candidate lines according to the two selected tangent points;
and finally, according to the positions of the two newly-built ring main units on each selected new outgoing target line, obtaining the positions of the four newly-built ring main units on the two candidate lines, and taking the newly-built ring main units on the four obtained positions as user access power points.
In one embodiment, if the current connection is not marginal, a new outgoing target line meeting the conditions is obtained through four condition filtering in the following table 4:
TABLE 4 Table 4
Based on the screening result of the newly-out target wiring in the last step, circularly acquiring the position available for preassembling the new ring main unit in each selected newly-out target wiring, and performing section calculation on the position available for preassembling the new ring main unit: firstly, calculating the distance from each position available for preassembling a new ring main unit in each selected new target line to a user report point by using a distance formula through the position (longitude and latitude) available for preassembling the new ring main unit in each selected new target line and the user report point coordinates, and selecting 2 nearest positions available for preassembling the new ring main unit as candidate nodes according to the distance; secondly, for the above 2 candidate nodes, respectively, find their previous node (if the candidate node is the first point of the line, select the next node), according to the midpoint formula: x=x 1 +x 2 /2，y＝y 1 +y 2 And 2, calculating the positions of 2 newly-built ring main units in each selected new target line.
And drawing a circle through the coordinates of the user report points, cutting the circle with each selected new target line, calculating the distance from the tangent point on each selected new target line to the coordinates of the user report points, sequencing the distances, and selecting 2 selected new target lines with the nearest distance as candidate lines.
Searching the positions of 4 newly-built ring main units on 2 candidate lines, and taking the newly-built ring main units corresponding to the 4 positions as user access power points.
As shown in fig. 2, in an embodiment of the present invention, an intelligent analysis system for meeting the requirement of a medium voltage user for accessing a power supply point is provided, including;
the installation information obtaining unit 110 is configured to obtain coordinates of an installation point of a user and a corresponding installation grid of a user electricity consumption in a preset distribution grid level model where the coordinates are located;
the information state detection unit 120 is configured to detect a current connection margin in a telegraph installation grid of a user, an existing ring main unit, and a existence condition of a standby angle in the existing ring main unit;
the user access power point confirmation unit 130 is configured to screen a line in a current connection or a new target connection of the substation according to the detection result, and take a certain number of existing ring main units or newly-built ring main units on all the selected lines as the user access power point.
The embodiment of the invention has the following beneficial effects:
1. according to the invention, the previous manual operation of the multiple systems for switching to acquire data and on-line and off-line confirmation schemes is performed, so that the system can automatically acquire data and intelligently recommend alternative points, the working efficiency of planning personnel is greatly improved, time and labor are saved, and the accuracy of selecting the access power points is ensured;
2. the invention avoids the fact that the manual operation in the past is too dependent on personal experience judgment, can check the power supply relation in real time in the process of intelligent point selection of the system, improves the accuracy of a planning scheme, and further solves the problems that the time and the labor are wasted and the effect is difficult to guarantee when the user selects the power supply point through the manual experience.
It should be noted that, in the above system embodiment, each unit included is only divided according to the functional logic, but not limited to the above division, so long as the corresponding function can be implemented; in addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present invention.
Those of ordinary skill in the art will appreciate that all or a portion of the steps in implementing the methods of the above embodiments may be implemented by a program to instruct related hardware, where the program may be stored in a computer readable storage medium, such as ROM/RAM, a magnetic disk, an optical disk, etc.
The foregoing disclosure is illustrative of the present invention and is not to be construed as limiting the scope of the invention, which is defined by the appended claims.
Claims (6)
1. An intelligent analysis method for meeting the requirement of a medium-voltage user on access to a power supply point is characterized by comprising the following steps:
step S1, acquiring user report point coordinates and corresponding user telegraph loading grids in a preset distribution network grid level model;
step S2, detecting the current situation wiring margin in the user telegraph installation grid, the existing ring main unit and the existence condition of a standby angle in the existing ring main unit;
step S3, screening lines in the current wiring or the new target wiring of the transformer substation according to the detection result, and taking a certain number of existing ring main units or newly-built ring main units on all the selected lines as user access power points;
the step S3 specifically includes:
if the current connection has a margin and the existing ring main units have a standby angle, selecting the existing lines meeting the screening and combining conditions of the first preset lines in the current connection, and screening all the existing ring main units on each selected existing line to select the existing ring main units on each selected existing line meeting the screening and combining conditions of the first preset ring main units;
Acquiring the coordinates of all the selected existing ring main units, and respectively calculating the distance from each selected existing ring main unit to the user report point coordinates by combining the user report point coordinates;
determining the segmented cables connected to the corresponding existing lines of all the selected existing ring main units, acquiring a coordinate set formed by coordinates of preset sampling points on the segmented cable connected to each selected existing ring main unit, and further combining the coordinates of the user reporting points to respectively calculate the shortest distance from the segmented cable connected to each selected existing ring main unit to the coordinates of the user reporting points;
based on the distance from each selected existing ring main unit to the user report point coordinate and the shortest distance from the corresponding segmented cable connected with the selected existing ring main unit to the user report point coordinate, forming a distance set, sorting the distance set according to a preset rule, and further screening a certain number of existing ring main units meeting a first preset access condition from all the selected existing ring main units according to the sorted distance set to serve as user access power points;
wherein, the step S3 further includes:
if the current connection has a margin and the existing ring main unit has no standby angle, selecting an existing line meeting the screening and combining conditions of a second preset line from the current connection;
According to the user report point coordinates, the position of a newly-built ring main unit on each selected existing line is obtained, tangent plane calculation is carried out through the user report point coordinates and each selected existing line, so that the distance from the tangent point on each selected existing line to the user report point coordinates is obtained, and further according to the distance from the tangent point on each selected existing line to the user report point coordinates, a certain number of newly-built ring main units meeting a second preset access condition are taken as user access power points in all the positions of the newly-built ring main units;
wherein, the step S3 further includes:
if the current wiring is not provided with a margin, a transformer substation is enabled to newly output a target wiring, and a new output target line meeting the screening and combining conditions of a third preset line is selected from the new output target wiring of the transformer substation;
and obtaining the position of the newly-built ring main unit on each selected new target line according to the user report point coordinates, carrying out tangent plane calculation through the user report point coordinates and each selected new target line to obtain the distance from the tangent point on each selected new target line to the user report point coordinates, and further taking a certain number of newly-built ring main units meeting a third preset access condition as user access power points in all the positions of the newly-built ring main units according to the distance from the tangent point on each selected new target line to the user report point coordinates.
2. The intelligent analysis method for meeting the requirement of the medium voltage user access power supply point according to claim 1, wherein the specific steps of selecting a certain number of existing ring main units meeting the preset condition as the user access power supply point from all the selected existing ring main units based on the shortest distance from each selected existing ring main unit to the user report point coordinate and the shortest distance from the corresponding segmented cable connected with the selected existing ring main units to the user report point coordinate form a distance set, sequencing the distance set according to a preset rule, and further according to the sequenced distance set, wherein the specific steps of:
comparing the distance from each selected existing ring main unit to the user reporting point coordinate with the shortest distance from the corresponding segmented cable to the user reporting point coordinate;
if the distance from one selected existing ring main unit to the user reporting point coordinate is smaller than or equal to the shortest distance from the corresponding segmented cable connected with the selected existing ring main unit to the user reporting point coordinate, storing the distance from the selected existing ring main unit to the user reporting point coordinate into the distance set;
if the distance from one selected existing ring main unit to the user reporting point coordinate is greater than the shortest distance from the corresponding segmented cable to the user reporting point coordinate, storing the shortest distance from the corresponding segmented cable to the user reporting point coordinate into the distance set;
And sorting the distance sets according to a rule from small to large, selecting six minimum distances from the sorted distance sets, and further acquiring corresponding six existing ring main units from all the selected existing ring main units according to the six minimum distances, wherein the six corresponding existing ring main units are used as user access power points.
3. The method for intelligent analysis of a medium voltage subscriber access point of claim 2, further comprising:
if the distance from a user access power point to the coordinates of the user reporting point is greater than the shortest distance between the corresponding segmented cable and the coordinates of the user reporting point, the user reporting point can be accessed by directly cutting the corresponding segmented cable.
4. The intelligent analysis method for meeting the requirement of the medium voltage user access point according to claim 1, wherein the specific steps of obtaining the position of the newly-built ring main unit on each selected existing line according to the user report point coordinates, performing tangent plane calculation with each selected existing line through the user report point coordinates to obtain the distance from the tangent point on each selected existing line to the user report point coordinates, and further obtaining a certain number of newly-built ring main units meeting the second predetermined access condition as the user access point in all the positions of the newly-built ring main units according to the distance from the tangent point on each selected existing line to the user report point coordinates comprise:
Acquiring all positions which can be used for pre-installing a new ring main unit on each selected existing line, calculating the distances from all positions which can be used for storing a new ring main unit on each selected existing line to the coordinates of the user report points by combining the coordinates of the user report points, and further selecting two positions which can be used for pre-installing the new ring main unit with the minimum distance from the coordinates of the user report points on each selected existing line according to the distances from all positions which can be used for storing the new ring main unit on each selected existing line to the coordinates of the user report points;
determining the positions of two adjacent ring main units, which are selected on each selected existing line and can be used for preassembling the new ring main units, of the positions of the two adjacent ring main units on each selected existing line, and carrying out average value calculation on the positions of the two adjacent ring main units and the positions of the two adjacent ring main units on each selected existing line to obtain the positions of the two new ring main units on each selected existing line; the positions of the adjacent ring main units are the positions of the adjacent existing ring main units or the positions of the adjacent ring main units which can be used for preassembling the new ring main units;
drawing circles respectively by taking the coordinates of the user report points as center points and tangent with each selected existing line to obtain corresponding tangent points, and further calculating the distances from the tangent points on each selected existing line to the coordinates of the user report points respectively;
Sorting the distances from the tangent points on each selected existing line to the coordinates of the user report points according to the sequence from small to large, selecting two tangent points with the minimum distance from the coordinates of the user report points, and obtaining two corresponding selected existing lines as candidate lines according to the two selected tangent points;
and according to the positions of the two newly-built ring main units on each selected existing line, obtaining the positions of the four newly-built ring main units on the two candidate lines, and taking the newly-built ring main units on the four obtained positions as user access power points.
5. The intelligent analysis method for meeting the requirement of the medium voltage user access power supply point according to claim 1, wherein the specific steps of obtaining the position of the newly-built ring main unit on each selected new target line according to the user report point coordinates, performing tangent plane calculation through the user report point coordinates and each selected new target line to obtain the distance from the tangent point on each selected new target line to the user report point coordinates, and further obtaining a certain number of newly-built ring main units meeting the third predetermined access condition as the user access power supply point in all the positions of the newly-built ring main units according to the distance from the tangent point on each selected new target line to the user report point coordinates include:
Acquiring all positions available for pre-installing a new ring main unit on each selected new output target line, calculating the distances from all positions available for storing a new ring main unit on each selected new output target line to the user report point coordinates by combining the user report point coordinates, and further selecting two positions available for pre-installing the new ring main unit with the minimum distance from the user report point coordinates on each selected new output target line according to the distances from all positions available for storing the new ring main unit on each selected new output target line to the user report point coordinates;
determining the positions of two adjacent ring main units, which are selected on each selected new outgoing target line and can be used for preassembling the positions of the new ring main units, and carrying out average value calculation on the positions of the two adjacent ring main units, which are selected on each selected new outgoing target line and can be used for preassembling the new ring main units, to obtain the positions of two new ring main units on each selected new outgoing target line; the positions of the adjacent ring main units are adjacent positions which can be used for preassembling the new ring main units;
drawing circles respectively with the coordinates of the user report points as the center points and tangent to each selected new target line to obtain corresponding tangent points, and further calculating the distances from the tangent points on each selected new target line to the coordinates of the user report points respectively;
Sorting the distances from the tangent points on each selected new target line to the coordinates of the user report points according to the sequence from small to large, selecting two tangent points with the minimum distance from the coordinates of the user report points, and obtaining two corresponding selected new target lines as candidate lines according to the two selected tangent points;
and according to the positions of the two newly-built ring main units on each selected new outgoing target line, obtaining the positions of the four newly-built ring main units on the two candidate lines, and taking the newly-built ring main units on the four obtained positions as user access power points.
6. An intelligent analysis system meeting the requirement of a medium-voltage user for accessing a power supply point is characterized by comprising the following components;
the installation information acquisition unit is used for acquiring user installation point coordinates and corresponding user electricity installation grids in a preset distribution network grid level model;
the information state detection unit is used for detecting the current situation wiring margin in the user telegraph installation grid, the existing ring main unit and the existence condition of the standby angle in the existing ring main unit;
the user access power point confirming unit is used for screening lines in the current-situation wiring or the new-outgoing target wiring of the transformer substation according to the detection result, and taking a certain number of existing ring main units or newly-built ring main units on all the selected lines as user access power points;
The user access power point confirmation unit comprises a first user access power point confirmation module, a second user access power point confirmation module and a third user access power point confirmation module;
the first user access power point confirmation module is used for selecting an existing line meeting a first preset line screening combination condition in the current connection when the current connection is provided with a margin and the existing ring main units are provided with a standby angle, and screening all the existing ring main units on each selected existing line to select the existing ring main units on each selected existing line meeting the first preset ring main unit screening combination condition;
acquiring the coordinates of all the selected existing ring main units, and respectively calculating the distance from each selected existing ring main unit to the user report point coordinates by combining the user report point coordinates;
determining the segmented cables connected to the corresponding existing lines of all the selected existing ring main units, acquiring a coordinate set formed by coordinates of preset sampling points on the segmented cable connected to each selected existing ring main unit, and further combining the coordinates of the user reporting points to respectively calculate the shortest distance from the segmented cable connected to each selected existing ring main unit to the coordinates of the user reporting points; and
Based on the distance from each selected existing ring main unit to the user report point coordinate and the shortest distance from the corresponding segmented cable connected with the selected existing ring main unit to the user report point coordinate, forming a distance set, sorting the distance set according to a preset rule, and further screening a certain number of existing ring main units meeting a first preset access condition from all the selected existing ring main units according to the sorted distance set to serve as user access power points;
the second user accesses the power point confirmation module, and is used for selecting an existing line meeting the screening and combining conditions of a second preset line from the current connection when the current connection has a margin and the existing ring main unit has no standby angle; the position of a newly-built ring main unit on each selected existing line is obtained according to the user report point coordinates, tangent plane calculation is carried out on each selected existing line through the user report point coordinates and each selected existing line to obtain the distance from the tangent point on each selected existing line to the user report point coordinates, and a certain number of newly-built ring main units meeting the second preset access condition are taken as user access power points in all the positions of the newly-built ring main units according to the distance from the tangent point on each selected existing line to the user report point coordinates;
The third user accesses the power point confirmation module, and is configured to make the transformer substation newly output a target connection if the current connection has no margin, and select a new output target line meeting a third predetermined line screening combination condition from the new output target connection of the transformer substation; and obtaining the position of the newly-built ring main unit on each selected new target line according to the user report point coordinates, performing tangent plane calculation through the user report point coordinates and each selected new target line to obtain the distance from the tangent point on each selected new target line to the user report point coordinates, and further taking a certain number of newly-built ring main units meeting the third preset access condition as user access power points in all the positions of the newly-built ring main units according to the distance from the tangent point on each selected new target line to the user report point coordinates.
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| CN104538958A (en) * | 2014-12-31 | 2015-04-22 | 广东电网有限责任公司佛山供电局 | Intelligent analysis method and system for power grid access point of electricity customer |
| CN111835014A (en) * | 2020-08-15 | 2020-10-27 | 杨银平 | Multi-node power grid voltage stabilization control system |
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| IL210374A0 (en) * | 2010-12-30 | 2011-03-31 | Eci Telecom Ltd | Technique for remote power feeding in access networks |
| US20210294826A1 (en) * | 2018-02-09 | 2021-09-23 | Longyu CHEN | Modeling Analysis Method for Equipment Management Network and Electronic Equipment |
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| CN104538958A (en) * | 2014-12-31 | 2015-04-22 | 广东电网有限责任公司佛山供电局 | Intelligent analysis method and system for power grid access point of electricity customer |
| CN111835014A (en) * | 2020-08-15 | 2020-10-27 | 杨银平 | Multi-node power grid voltage stabilization control system |
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