CN116505525A - Load switching method and device for power grid line and computer storage medium - Google Patents
Load switching method and device for power grid line and computer storage medium Download PDFInfo
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- CN116505525A CN116505525A CN202310781506.XA CN202310781506A CN116505525A CN 116505525 A CN116505525 A CN 116505525A CN 202310781506 A CN202310781506 A CN 202310781506A CN 116505525 A CN116505525 A CN 116505525A
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- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000012546 transfer Methods 0.000 claims abstract description 141
- 230000036586 afterload Effects 0.000 claims description 7
- 238000004590 computer program Methods 0.000 claims description 5
- 238000012216 screening Methods 0.000 claims description 5
- 238000012545 processing Methods 0.000 claims description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000004364 calculation method Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0073—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source when the main path fails, e.g. transformers, busbars
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/007—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources
- H02J3/0075—Arrangements for selectively connecting the load or loads to one or several among a plurality of power lines or power sources for providing alternative feeding paths between load and source according to economic or energy efficiency considerations, e.g. economic dispatch
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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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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention provides a load transfer method and device of a power grid line and a computer storage medium, wherein the method comprises the following steps: aiming at the problem line with at least one connecting line at the tail end and the middle point, calculating whether the load rate exceeds a load rate threshold value after the load is transferred to the alternative transfer line, if so, updating the state of an opening switch between the alternative transfer line and the problem line to be closed, and updating the state of a transfer closing switch to be opened; if not, transferring the load from the first closed switch at the downstream of the middle point to the tail end to the first alternative transfer circuit, transferring the rest of the load to the second alternative transfer circuit, calculating whether the load rates are smaller than the load rate threshold value, if so, updating the states of the transfer closed switch and the first closed switch at the downstream of the middle point to be open, and updating the states of the open switch between the first alternative transfer circuit and the problem circuit and the open switch between the second alternative transfer circuit and the problem circuit to be closed.
Description
Technical Field
The invention relates to the field of power grids, in particular to a load transfer method and device of a power grid line and a computer storage medium.
Background
At present, for the problem of heavy overload of a line (such as a medium-voltage line) existing in a power grid, the standing book, the net rack and the load extremum of the power grid line and peripheral power grid equipment are mainly analyzed manually, a solution is given based on planning experience, the workload required to be analyzed is large, and subjectivity is high.
Although some re-planning of the line re-overload is implemented by computer software in the prior art, the re-planning of the line re-overload is not effective in the prior art.
Disclosure of Invention
In view of the above-described situation, a main object of the present invention is to provide a load transfer method, apparatus, and computer storage medium for a power grid line, which can perform load transfer with respect to a problem line.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
a load transfer method of a power grid line comprises the following steps:
s100, reading a power grid line graph from a database, and identifying a problem line with a load rate exceeding a load rate threshold value from main lines in the power grid line graph; each main line is connected with a plurality of branch lines, each main line is provided with a plurality of closed switches, and two sides of each closed switch are respectively connected with at least one branch line;
s200, aiming at a problem line with at least one connecting line at each of the end point and the middle point, executing the following steps:
s210, determining a transfer closed switch in all closed switches from the tail end to the front end of the problem line, so that after loads of all branch lines from the transfer closed switch to the tail end of the problem line are transferred, the load rate of the problem line is reduced to be smaller than a load rate threshold value; wherein, a disconnecting switch is arranged between each connecting line and the problem line;
s220, screening a contact line with the minimum load rate from the contact lines as an alternative transfer line, calculating whether the load rate of the alternative transfer line exceeds a load rate threshold value after transferring the transferred load to the alternative transfer line, if so, executing step S230, otherwise, executing step S240;
s230, updating the state of an opening switch between the alternative transfer circuit and the problem circuit to be closed, and updating the state of the transfer closing switch to be opened;
s240, selecting a connecting line with the minimum load rate from connecting lines connected with the tail ends of the problem lines as a first alternative transfer line, selecting a connecting line with the minimum load rate from connecting lines connected with the middle points of the problem lines as a second alternative transfer line, transferring loads from a first closed switch at the downstream of the middle points to the tail ends to the first alternative transfer line, transferring loads from the middle points to the transfer closed switch to the second alternative transfer line, calculating whether the load rates of the first alternative transfer line and the second alternative transfer line are smaller than a load rate threshold value, if yes, updating the states of the transfer closed switch and the first closed switch at the downstream of the middle points to be open, and updating the states of the open switch between the first alternative transfer line and the problem line and the open switch between the second alternative transfer line and the problem line to be closed.
The invention also provides a load switching device of the power grid line, which comprises:
the first processing unit is used for reading the power grid line graph from the database and identifying a problem line with the load rate exceeding a load rate threshold value from main lines in the power grid line graph; each main line is connected with a plurality of branch lines, each main line is provided with a plurality of closed switches, and two sides of each closed switch are respectively connected with at least one branch line;
the second processing unit is configured to execute the following steps for a problem line where at least one connection line exists at each of the end point and the intermediate point:
determining a transfer closed switch in all closed switches from the end to the front end of the problem line, so that after the loads of all branch lines from the transfer closed switch to the end of the problem line are transferred, the load rate of the problem line is reduced to be smaller than a load rate threshold value; wherein, a disconnecting switch is arranged between each connecting line and the problem line;
screening out the contact line with the minimum load rate from the contact lines as an alternative transfer line, calculating whether the load rate of the alternative transfer line exceeds a load rate threshold value after transferring the transferred load to the alternative transfer line,
if yes, executing: updating the state of an opening switch between the alternative transfer circuit and the problem circuit to be closed, and updating the state of the transfer closing switch to be opened;
if not, executing: and selecting one connecting line with the minimum load rate from the connecting lines connected with the tail ends of the problem lines as a first alternative switching line, selecting one connecting line with the minimum load rate from the connecting lines connected with the middle points of the problem lines as a second alternative switching line, switching the load from the first closed switch at the downstream of the middle points to the tail ends to the first alternative switching line, switching the load from the middle points to the switching closed switch to the second alternative switching line, calculating whether the load rates of the first alternative switching line and the second alternative switching line are smaller than a load rate threshold value, if so, updating the states of the switching closed switch and the first closed switch at the downstream of the middle points to be open, and updating the states of the open switch between the first alternative switching line and the problem line and the open switch between the second alternative switching line and the problem line to be closed.
The invention also provides a computer storage medium for storing a computer program, which is characterized in that the computer program is executed by a processor as any one of the load transfer methods of the power grid line.
According to the scheme of the invention, the load transfer of the problem line can be realized by using software, and a targeted load transfer method is adopted for the problem line in the power grid line diagram of the specific topological structure, so that the load transfer efficiency is high, and the maximum utilization of the load capacity of the existing power grid line can be realized.
Other advantages of the present invention will be set forth in the description of specific technical features and solutions, by which those skilled in the art should understand the advantages that the technical features and solutions bring.
Drawings
Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In the figure:
FIG. 1 is a grid line according to a preferred embodiment of the present invention;
FIG. 2 is a grid line according to another preferred embodiment of the present invention;
FIG. 3 is a grid line according to another preferred embodiment of the present invention;
FIG. 4 is a grid line according to another preferred embodiment of the present invention;
FIG. 5 is a grid line according to another preferred embodiment of the present invention;
FIG. 6 is a grid line according to another preferred embodiment of the present invention;
FIG. 7 is a grid line according to another preferred embodiment of the present invention;
FIG. 8 is a grid line according to another preferred embodiment of the present invention;
FIG. 9 is a grid line according to another preferred embodiment of the present invention;
FIG. 10 is a grid line according to another preferred embodiment of the present invention;
fig. 11 is a grid line according to another preferred embodiment of the present invention.
Detailed Description
The present invention is described below based on examples, but the present invention is not limited to only these examples. In the following detailed description of the present invention, certain specific details are set forth in order to avoid obscuring the present invention, and in order to avoid obscuring the present invention, well-known methods, procedures, flows, and components are not presented in detail.
Moreover, those of ordinary skill in the art will appreciate that the drawings are provided herein for illustrative purposes and that the drawings are not necessarily drawn to scale.
Unless the context clearly requires otherwise, throughout the description and the claims, the words "comprise", "comprising", and the like are to be construed in an inclusive sense as opposed to an exclusive or exhaustive sense; that is, it is the meaning of "including but not limited to".
Fig. 1 is a power grid line graph of an embodiment of the present invention, the power grid line graph is stored in a database, and software (computer program) can read the power grid line graph from the database during execution, and then execute the load transfer method for the power grid line of the present invention.
As shown in fig. 1, the grid line graph includes a plurality of main lines and a plurality of branch lines, such as main lines Ma, mb, mc, and Md, branch lines B1-B11; each main line is connected with a plurality of branch lines, each main line is provided with a plurality of closed switches, two sides of each closed switch are respectively connected with at least one branch line, and each main line is connected with a transformer substation; for example, a main line Ma is connected with a transformer substation STa, a plurality of branch lines B1-B3 are connected to the main line Ma, a plurality of closing switches SW1 and SW2 are arranged on the main line Ma, two sides of the closing switch SW1 are respectively connected with the branch lines B1 and B2, and two sides of the closing switch SW2 are respectively connected with the branch lines B2 and B3; as another example, the main line Mc is connected to the transformer substation STc, the main line Mc is connected to a plurality of branch lines B4-B6, a plurality of closing switches SW4 and SW5 are disposed on the main line Mc, two sides of the closing switch SW4 are respectively connected to the branch lines B4 and B5, and two sides of the closing switch SW5 are respectively connected to the branch lines B5 and B6.
The main lines Ma, mb, mc and Md are interconnecting lines, and for the main line Ma, three interconnecting lines are provided, namely, the main lines Mb, mc and Md, wherein a disconnection switch SW6 is arranged between the main line Ma and the interconnecting line Mb, a disconnection switch SW3 is arranged between the main line Ma and the interconnecting line Mc, and a disconnection switch SW9 is arranged between the main line Ma and the interconnecting line Md.
As shown in fig. 2, which is a power grid line diagram of another embodiment of the present invention, the main lines Ma, mb, mc and Md are not tie lines, for example, they do not have any tie lines for the main line Ma; for the main line Ma, there are adjacent lines including main lines Mb, mc, and Md, and branch lines of these main lines within the set power supply radius requirement, wherein the distances from Mc, md, and Mb to the main line Ma sequentially increase.
The invention relates to a load transfer method of a power grid line, which comprises the following steps:
s100, reading a power grid line graph from a database, and identifying a problem line with a load rate exceeding a load rate threshold (for example, 80%) from main lines in the power grid line graph; each main line is connected with a plurality of branch lines, each main line is provided with a plurality of closed switches, and two sides of each closed switch are respectively connected with at least one branch line. For example, read from the database is a grid line graph as shown in fig. 1, in which the load factor of the main line Ma exceeds the load factor threshold, and none of the main lines Mb, mc and Md load factors exceeds the load factor threshold, so the main line Ma will be identified as a problem line in this step; the main line Ma is connected with a plurality of branch lines B1-B3, the main line Mb is connected with a plurality of branch lines B7-B8, the main line Mc is connected with a plurality of branch lines B4-B6, and the main line Md is connected with a plurality of branch lines B9-B11; at least one branch line is connected to both sides of each of the closing switches, for example, branch lines B9 and B10 are connected to both sides of the closing switch SW10, respectively.
S200: aiming at the problem line with at least one connecting line at the tail end and the middle point, the following steps are executed:
s210, determining a transfer closed switch in all closed switches from the tail end to the front end of the problem line, so that after loads of all branch lines from the transfer closed switch to the tail end of the problem line are transferred, the load rate of the problem line is reduced to be smaller than a load rate threshold value; wherein, be provided with the disconnect switch between every contact line and the problem circuit. For example, as described above, the main line Ma is a problem line having a terminal Pe and a front end Pf, and therefore it is necessary to determine transfer closing switches among all closing switches (SW 1 and SW 2) from the terminal Pe to the front end Pf so that after the loads of all branch lines (B1 and B2) from the transfer closing switches to the terminal of the problem line Ma are transferred, the load factor of the problem line Ma is reduced to less than the load factor threshold, for example, by calculating the transfer closing switch SW1, the load factor of the problem line Ma is reduced to 60% after the load transfer to less than the load factor threshold 80%.
S220, screening a contact line with the minimum load rate from the contact lines as an alternative transfer line, calculating whether the load rate of the alternative transfer line exceeds a load rate threshold value after transferring the transferred load to the alternative transfer line, if so, executing step S230, otherwise, executing step S240; for example, the contact line Mc with the smallest load rate is selected from the plurality of contact lines, that is, the main lines Mb, mc and Md, as the candidate switching line, if the switched load is switched to the candidate switching line Mc, then it is determined whether the load rate of the candidate switching line Mc is less than the load rate threshold, and if yes, step S230 is executed; if the load factor of the selected transit line Mc is greater than the load factor threshold, step S240 is executed.
After the load to be transferred is transferred to the alternative transfer line, calculating whether the load rate of the alternative transfer line exceeds the load rate threshold value may specifically include: and calculating whether the load rate of the alternative transfer line exceeds a load rate threshold value after transferring the transferred load to the alternative transfer line at the maximum load moment of the feeder line group formed by the problem line and the at least one connecting line. For example, a maximum load moment of the feeder group consisting of the problematic line Ma and the at least one interconnecting line Mc, mb, and Md (which may be formed by using a load curve of the feeder group acquired in real time (e.g., 8760×4 load points)) is calculated, and after the switched loads B2 and B3 are switched to the alternative switching line, whether the load rate of the alternative switching line exceeds the load rate threshold value is calculated.
S230, updating the state of an opening switch between the alternative transfer circuit and the problem circuit to be closed, and updating the state of the transfer closing switch to be opened; for example, continuing with the example of the yes branch in step S220, when the load ratio of the alternative switching line Mc is smaller than the load ratio threshold after the switched load is switched to the alternative switching line Mc, the state of the open switch SW3 between the alternative switching line Mc and the problem line Ma is updated to be closed, the state of the switching close switch SW1 is updated to be open, and the updated grid line is shown in fig. 3.
S240, selecting a connecting line with the minimum load rate from connecting lines connected with the tail ends of the problem lines as a first alternative transfer line, selecting a connecting line with the minimum load rate from connecting lines connected with the middle points of the problem lines as a second alternative transfer line, transferring loads from a first closed switch at the downstream of the middle points to the tail ends to the first alternative transfer line, transferring loads from the middle points to the transfer closed switch to the second alternative transfer line, calculating whether the load rates of the first alternative transfer line and the second alternative transfer line are smaller than a load rate threshold value, if yes, updating the states of the transfer closed switch and the first closed switch at the downstream of the middle points to be open, and updating the states of the open switch between the first alternative transfer line and the problem line and the open switch between the second alternative transfer line and the problem line to be closed. For example, continuing with the description of the no branch in step S220, in the case where the load rate of the alternative transit line Mc is greater than the load rate threshold value after the transit of the load to the alternative transit line Mc, one contact line Mc having the smallest load rate is selected as the first alternative transit line Mc from the contact lines Mc and Md connecting the end Pe of the problematic line Ma, one contact line Mb having the smallest load rate is selected as the second alternative transit line Mb from the contact lines Mb and Me (Me and Mb are commonly connected at the intermediate point Pm, not shown in fig. 1) connecting the intermediate point Ma, the load (i.e., the branch line B3) of the first closing switch SW2 downstream of the intermediate point Pm to the end Pe is transit to the first alternative transit line Mc in the problematic line Ma, the load (i.e. branch line B2) from the intermediate point Pm to the transfer closing switch SW1 is transferred to the second alternative transfer line Mb, whether the load rates of the first alternative transfer line Mc and the second alternative transfer line Mb are smaller than the load rate threshold is calculated, if yes, the states of the transfer closing switch SW1 and the first closing switch SW2 downstream of the intermediate point Pm are updated to be opened, the states of the opening switch SW3 between the first alternative transfer line Mc and the problem line Ma and the opening switch SW6 between the second alternative transfer line Mb and the problem line Ma are updated to be closed, and the updated power grid line is shown in fig. 4.
As shown in fig. 2, the problem line Ma has no tie line and has adjacent lines including main lines Mb, mc, and Md, and branch lines of these main lines within the set power supply radius requirement (as indicated by the dotted circle in fig. 2). In some embodiments, the load transferring method of the above embodiments may further include step S300, for a problematic line where there is no tie line and there is an adjacent line within a set power supply radius requirement, of executing the following steps:
s310, determining a transfer closed switch in all closed switches from the tail end to the front end of the problem line, so that after loads of all branch lines from the transfer closed switch to the tail end of the problem line are transferred, the load rate of the problem line is reduced to be smaller than a load rate threshold value; wherein the adjacent lines include adjacent trunk lines or adjacent branch lines. For example, the changeover switch SW1 is determined among all the closed switches SW1 and SW2 of the problematic wire Ma from the end Pe to the front end Pf such that after the loads of all the branch wires B2 and B3 from the changeover switch SW1 to the end Pe of the problematic wire Ma are changed over, the load rate of the problematic wire Ma is reduced to, for example, 60% and less than the load rate threshold value 80%.
S320, starting from an adjacent line which is not subjected to load transfer and is closest to the problem line, calculating whether the load rate of the adjacent line exceeds a load rate threshold after transferring the transferred load to the adjacent line, if so, executing step S330, and if not, executing step S340. For example, continuing with the example in step S310, after the load-transferring load factor calculation is not performed and the adjacent line Mc closest to the problematic line is started, it is calculated whether the load factor of the adjacent line Mc is smaller than the load factor threshold after the transferred load branch lines B2 and B3 are transferred to the adjacent line Mc, if yes, step S330 is performed, and if not, step S340 is performed.
After the load to be transferred is transferred to the adjacent line, calculating whether the load rate of the adjacent line exceeds a load rate threshold value may specifically include: and calculating whether the load rate of the adjacent line exceeds a load rate threshold value after the transferred load is transferred to the adjacent line at the moment of maximum load of the line group formed by the problem line and the adjacent line. For example, it is calculated whether or not the load ratio of the adjacent line exceeds the load ratio threshold after the switched loads B2 and B3 are switched to the adjacent line at the time of maximum load of the line group consisting of the problematic line Ma and the adjacent lines Mb, mc, and Md.
And S330, updating the state of the transfer closed switch to be open, and generating a newly-built connection line for connecting the tail end of the problematic line with the adjacent line according to the GIS road information and the pipe gallery information. For example, the description will be continued taking the yes branch of step S320 as an example, in which the state of the transfer closing switch SW1 is updated to be open, and a newly-built connection line for connecting the end Pe of the problematic line Ma and the adjacent line Mc is generated based on the GIS road information and the piping lane information, and the updated grid line is shown in fig. 5.
S340, re-executing step S320. In step S320 executed again, the load factor calculation is continued from the adjacent line Md closest to the problematic line after the load transfer is not performed, after the load branch lines B2 and B3 to be transferred are transferred to the adjacent line Md, whether the load factor of the adjacent line Md is smaller than the load factor threshold is calculated, if yes, step S330 is executed, and the updated grid line is shown in fig. 6; if not, the next round of step S340 is executed.
As shown in fig. 7, a grid line diagram of another embodiment of the present invention is shown, wherein the problem line Ma has no tie line, 7 and there are adjacent substations STc, STd and STb within the set supply radius requirement (as shown by the dashed circle in fig. 7); wherein the distances from the substations STc, STd and STb to the main line Ma increase in sequence. In some embodiments, the load transferring method of the above embodiment further includes the following steps: s400, aiming at the problem line that no connecting line exists and adjacent substations exist in the set power supply radius requirement, the following steps are executed:
s410, determining transfer closed switches in all closed switches from the tail end to the front end of the problem line, so that after loads of all branch lines from the transfer closed switches to the tail end of the problem line are transferred, the load rate of the problem line is reduced to be smaller than a load rate threshold; wherein the adjacent substation has a free line port. For example, the changeover switch SW1 is determined among all the closed switches SW1 and SW2 of the end Pe to the front end Pf of the problem line Ma so that the load rate of the problem line Ma is reduced to less than 60% and less than the load rate threshold after the loads of all the branch lines B2 and B3 from the changeover switch SW1 to the end Pe of the problem line are changed over; wherein the adjacent substations STb, STb and STd have free line ports.
And S420, starting from an adjacent transformer substation which is not subjected to load transfer and is closest to the problem line, calculating whether the load rate of the adjacent transformer substation is smaller than a load rate threshold value after transferring the transferred load to the adjacent transformer substation, if so, executing the step S430, and if not, executing the step S440. For example, continuing with the example in step S410, starting with the adjacent substation STc that has not performed load transfer and is closest to the problematic line, it is calculated whether the load ratio of the adjacent substation STc is less than the load ratio threshold after transferring the loads B2 and B3 to the adjacent substation STc, if so, step S430 is performed, and if not, step S440 is performed.
After the load to be transferred is transferred to the adjacent substation, calculating whether the load rate of the adjacent substation exceeds a load rate threshold value or not, specifically including: and calculating whether the load rate of the adjacent transformer substation exceeds a load rate threshold value after the transferred load is transferred to the adjacent transformer substation at the maximum load moment of the line group formed by the problem line and the adjacent transformer substation. For example, it is calculated whether or not the load rate of the adjacent substation exceeds the load rate threshold after the transferred load is transferred to the adjacent substation at the time of maximum load of the line group consisting of the problematic line Ma and the adjacent substations STb, and STd.
And S430, updating the state of the transfer closed switch to be open, and generating a newly-built connection line for connecting the end of the problematic line with the adjacent substation according to the GIS road information and the pipe gallery information. For example, continuing with the description of the "yes" branch of step S420, the state of the transfer closing switch SW1 is updated to be open, and a newly-built connection line for connecting the end Pe of the problematic line Ma with the adjacent substation STc is generated from the GIS road information and the piping lane information, and the updated grid line is shown in fig. 8.
S440, re-executing step S420. In step S420, after the load is transferred from the adjacent substation STd closest to the problematic line, whether the load ratio of the adjacent substation STd is smaller than the load ratio threshold is calculated after transferring the transferred loads B2 and B3 to the adjacent substation STd, if yes, step S430 is performed, and the updated grid line is shown in fig. 9; if not, the next round of step S440 is performed.
In some embodiments, the load transferring method of the above embodiment further includes the following steps after step S100 and before step S200:
s110, reading the cross section parameters of the problem line from a database. The database also stores cross-sectional parameters of each main line in the grid line for software reading.
S120, judging whether the cross section parameter is smaller than the specified maximum cross section parameter, if so, updating the cross section parameter of the problem line to be a larger cross section parameter (for example), executing step S130, and if not, executing step S200. The specified maximum cross-section parameters can refer to specifications in specifications files such as guidelines, standards and the like, the specifications files can specify cross-section parameters K1-Kn of a plurality of different grades of the main line, and the specified cross-section parameters can also be determined in combination with the power supply subarea to which the problem line belongs. For example, if the current cross-sectional parameter of the problematic wire is K1, which is smaller than the prescribed maximum cross-sectional parameter Kn, the cross-sectional parameter of the problematic wire is updated to an adjacent larger cross-sectional parameter K2, and step S130 is performed. If the current cross-sectional parameter of the problematic wire is Kn, which is equal to the prescribed maximum cross-sectional parameter Kn, step S200 is performed.
And S130, calculating whether the load rate of the problem line after updating the cross section parameters is smaller than a load rate threshold, if so, updating and storing the cross section parameters of the problem line as the larger cross section parameters in a database, and if not, re-executing the step S120. Continuing with the example of step S120, for example, if the load factor of the problematic line decreases to 60% and less than 80% of the load factor threshold after the updated cross-sectional parameter K2, the cross-sectional parameter update of the problematic line is saved as the larger cross-sectional parameter K2 in the database. After updating the cross-section parameter K2, if the load rate of the problematic line is still greater than 80% of the load rate threshold, step S120 is performed again.
In some embodiments, in the load transferring method of the above embodiments, after step S100 and before step S200, a problem line of a connection line exists for an end or an intermediate point, and the method further includes the following steps: determining a transfer closed switch in all closed switches from the end to the front end of the problem line, so that after the loads of all branch lines from the transfer closed switch to the end of the problem line are transferred, the load rate of the problem line is reduced to be smaller than a load rate threshold value; wherein, a disconnecting switch is arranged between each connecting line and the problem line; after the load to be transferred is transferred to the interconnecting link, whether the load rate of the interconnecting link exceeds the load rate threshold is calculated, if yes, step S200 is executed, if not, the state of the disconnection switch between the interconnecting link and the problem line is updated to be closed, and the state of the transfer closing switch is updated to be opened. As shown in fig. 10, a power grid line diagram of another embodiment of the present invention is shown, where a tie line Mc exists at the end of the problem line Ma. For the problem line Ma, the transfer closing switch SW1 is determined among all closing switches SW1 and SW2 of the end Pe to the front end Pf of the problem line Ma so that after the loads of all branch lines B2 and B3 from the transfer closing switch SW1 to the end Pe of the problem line Ma are transferred, the load factor of the problem line Ma is reduced to, for example, 60%, less than the load factor threshold value 80%; after calculating that the load to be transferred is transferred to the interconnecting link Mc, if the load rate of the interconnecting link Mc still exceeds the load rate threshold, step S200 is executed, if the load rate of the interconnecting link Mc is smaller than the load rate threshold, the state of the open switch SW3 between the interconnecting link Mc and the problem line Ma is updated to be closed, the state of the transfer close switch SW1 is updated to be open, and the updated grid line is shown in fig. 11.
Those skilled in the art will appreciate that the above-described preferred embodiments can be freely combined and stacked without conflict.
It will be understood that the above-described embodiments are merely illustrative and not restrictive, and that all obvious or equivalent modifications and substitutions to the details given above may be made by those skilled in the art without departing from the underlying principles of the invention, are intended to be included within the scope of the appended claims.
Claims (10)
1. The load transfer method of the power grid line is characterized by comprising the following steps of:
s100, reading a power grid line graph from a database, and identifying a problem line with a load rate exceeding a load rate threshold value from main lines in the power grid line graph; each main line is connected with a plurality of branch lines, each main line is provided with a plurality of closed switches, and two sides of each closed switch are respectively connected with at least one branch line;
s200, aiming at a problem line with at least one connecting line at each of the end point and the middle point, executing the following steps:
s210, determining a transfer closed switch in all closed switches from the tail end to the front end of the problem line, so that after loads of all branch lines from the transfer closed switch to the tail end of the problem line are transferred, the load rate of the problem line is reduced to be smaller than a load rate threshold value; wherein, a disconnecting switch is arranged between each connecting line and the problem line;
s220, screening a contact line with the minimum load rate from the contact lines as an alternative transfer line, calculating whether the load rate of the alternative transfer line exceeds a load rate threshold value after transferring the transferred load to the alternative transfer line, if so, executing step S230, otherwise, executing step S240;
s230, updating the state of an opening switch between the alternative transfer circuit and the problem circuit to be closed, and updating the state of the transfer closing switch to be opened;
s240, selecting a connecting line with the minimum load rate from connecting lines connected with the tail ends of the problem lines as a first alternative transfer line, selecting a connecting line with the minimum load rate from connecting lines connected with the middle points of the problem lines as a second alternative transfer line, transferring loads from a first closed switch at the downstream of the middle points to the tail ends to the first alternative transfer line, transferring loads from the middle points to the transfer closed switch to the second alternative transfer line, calculating whether the load rates of the first alternative transfer line and the second alternative transfer line are smaller than a load rate threshold value, if yes, updating the states of the transfer closed switch and the first closed switch at the downstream of the middle points to be open, and updating the states of the open switch between the first alternative transfer line and the problem line and the open switch between the second alternative transfer line and the problem line to be closed.
2. The load transfer method according to claim 1, further comprising the steps of:
s300, aiming at a problem line which does not have a connecting line and has an adjacent line within the set power supply radius requirement, executing the following steps:
s310, determining a transfer closed switch in all closed switches from the tail end to the front end of the problem line, so that after loads of all branch lines from the transfer closed switch to the tail end of the problem line are transferred, the load rate of the problem line is reduced to be smaller than a load rate threshold value; wherein the adjacent lines include adjacent trunk lines or adjacent branch lines;
s320, calculating whether the load rate of the adjacent line is smaller than a load rate threshold value after the load is transferred from the adjacent line which is not subjected to load transfer and is closest to the problem line, if yes, executing a step S330, and if not, executing a step S340;
s330, updating the state of the transfer closing switch to be opened, and generating a newly-built connecting line for connecting the tail end of the problematic line with the adjacent line according to GIS road information and pipe gallery information;
s340, re-executing step S320.
3. The load transfer method according to claim 1, further comprising the steps of:
s400, aiming at the problem line that no connecting line exists and adjacent substations exist in the set power supply radius requirement, the following steps are executed:
s410, determining transfer closed switches in all closed switches from the tail end to the front end of the problem line, so that after loads of all branch lines from the transfer closed switches to the tail end of the problem line are transferred, the load rate of the problem line is reduced to be smaller than a load rate threshold; wherein the adjacent substation has a free line port;
s420, starting from an adjacent transformer substation which is not subjected to load transfer and is closest to a problem line, calculating whether the load rate of the adjacent transformer substation is smaller than a load rate threshold value after transferring the transferred load to the adjacent transformer substation, if so, executing a step S430, and if not, executing a step S440;
s430, updating the state of the transfer closed switch to be opened, and generating a newly-built connection line for connecting the tail end of the problematic line with the adjacent substation according to GIS road information and pipe gallery information;
s440, re-executing step S420.
4. The load transfer method according to claim 1, characterized by further comprising the steps of, after step S100 and before step S200:
s110, reading the cross section parameters of the problem line from a database;
s120, judging whether the cross section parameter is smaller than a specified maximum cross section parameter, if so, updating the cross section parameter of the problem line into a larger cross section parameter, executing the step S130, and if not, executing the step S200;
and S130, calculating whether the load rate of the problem line after updating the cross section parameters is smaller than a load rate threshold, if so, updating and storing the cross section parameters of the problem line as the larger cross section parameters in a database, and if not, re-executing the step S120.
5. The load transferring method according to claim 1, wherein after step S100 and before step S200, there is a problem line of a connection line for an end or an intermediate point, further comprising the steps of:
determining a transfer closed switch in all closed switches from the end to the front end of the problem line, so that after the loads of all branch lines from the transfer closed switch to the end of the problem line are transferred, the load rate of the problem line is reduced to be smaller than a load rate threshold value; wherein, a disconnecting switch is arranged between each connecting line and the problem line;
after the load to be transferred is transferred to the interconnecting link, whether the load rate of the interconnecting link exceeds the load rate threshold is calculated, if yes, step S200 is executed, if not, the state of the disconnection switch between the interconnecting link and the problem line is updated to be closed, and the state of the transfer closing switch is updated to be opened.
6. The load transfer method according to claim 1, wherein,
in step S220, after the load to be transferred is transferred to the alternative transfer line, it is calculated whether the load rate of the alternative transfer line exceeds a load rate threshold, which specifically includes: and calculating whether the load rate of the alternative transfer line exceeds a load rate threshold value after transferring the transferred load to the alternative transfer line at the maximum load moment of the feeder line group formed by the problem line and the at least one connecting line.
7. The load transfer method according to claim 2, wherein,
in step S320, after the load to be transferred is transferred to the adjacent line, it is calculated whether the load rate of the adjacent line exceeds a load rate threshold, which specifically includes: and calculating whether the load rate of the adjacent line exceeds a load rate threshold value after the transferred load is transferred to the adjacent line at the moment of maximum load of the line group formed by the problem line and the adjacent line.
8. The load transfer method according to claim 2, wherein,
in step S420, after the load to be transferred is transferred to the adjacent substation, it is calculated whether the load rate of the adjacent substation exceeds a load rate threshold, which specifically includes: and calculating whether the load rate of the adjacent transformer substation exceeds a load rate threshold value after the transferred load is transferred to the adjacent transformer substation at the maximum load moment of the line group formed by the problem line and the adjacent transformer substation.
9. A load transfer device for a power grid line, comprising:
the first processing unit is used for reading the power grid line graph from the database and identifying a problem line with the load rate exceeding a load rate threshold value from main lines in the power grid line graph; each main line is connected with a plurality of branch lines, each main line is provided with a plurality of closed switches, and two sides of each closed switch are respectively connected with at least one branch line;
the second processing unit is configured to execute the following steps for a problem line where at least one connection line exists at each of the end point and the intermediate point:
determining a transfer closed switch in all closed switches from the end to the front end of the problem line, so that after the loads of all branch lines from the transfer closed switch to the end of the problem line are transferred, the load rate of the problem line is reduced to be smaller than a load rate threshold value; wherein, a disconnecting switch is arranged between each connecting line and the problem line;
screening out the contact line with the minimum load rate from the contact lines as an alternative transfer line, calculating whether the load rate of the alternative transfer line exceeds a load rate threshold value after transferring the transferred load to the alternative transfer line,
if yes, executing: updating the state of an opening switch between the alternative transfer circuit and the problem circuit to be closed, and updating the state of the transfer closing switch to be opened;
if not, executing: and selecting one connecting line with the minimum load rate from the connecting lines connected with the tail ends of the problem lines as a first alternative switching line, selecting one connecting line with the minimum load rate from the connecting lines connected with the middle points of the problem lines as a second alternative switching line, switching the load from the first closed switch at the downstream of the middle points to the tail ends to the first alternative switching line, switching the load from the middle points to the switching closed switch to the second alternative switching line, calculating whether the load rates of the first alternative switching line and the second alternative switching line are smaller than a load rate threshold value, if so, updating the states of the switching closed switch and the first closed switch at the downstream of the middle points to be open, and updating the states of the open switch between the first alternative switching line and the problem line and the open switch between the second alternative switching line and the problem line to be closed.
10. A computer storage medium storing a computer program, characterized in that the computer program is executed by a processor as a load transfer method of a power grid line according to any one of claims 1-8.
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