CN116093940A - Distribution network line interconnection switch distribution point selection method, distribution network line interconnection switch distribution point selection device and storage medium - Google Patents
Distribution network line interconnection switch distribution point selection method, distribution network line interconnection switch distribution point selection device and storage medium Download PDFInfo
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Abstract
The invention relates to the technical field of power distribution network optimization, and discloses a distribution network line interconnection switch distribution point selection method, a distribution network line interconnection switch distribution point selection device and a storage medium. The method comprises the steps of determining a target power supply scheme set according to a trunk line set of a target transformer substation; taking a tower and a cable tapping point as target endpoints, taking a line segment between two adjacent target endpoints as a corresponding target line segment, and calculating load redundancy data corresponding to different schemes in the power supply scheme set to determine a distribution point selection range of a tie switch on a distribution network line; carrying out point distribution in the point distribution selection range according to the number of the target tie switches to obtain each alternative point distribution scheme; calculating the minimum redundancy of lines on different feeder switch sides under each alternative point distribution scheme, calculating the weight value of the corresponding alternative point distribution scheme according to the obtained minimum redundancy set of the lines, and selecting the alternative point distribution scheme with the maximum weight value as the optimal point distribution scheme. The invention can lead the distribution of the interconnection switches to be more reasonable and effectively improve the power supply reliability.
Description
Technical Field
The invention relates to the technical field of power distribution network optimization, in particular to a distribution network line interconnection switch distribution point selection method, a distribution network line interconnection switch distribution point selection device and a storage medium.
Background
In the prior art, the distribution point of the tie switch is generally designated by people at the initial stage of planning and construction of a distribution network line, and systematic analysis is not performed according to the load conditions at two sides of the tie switch, so that the tie switch is easy to be distributed unreasonably, and the situation that the load of a transfer supply at the side of a fault line cannot be born under the daily load of a non-fault line or the load of the transfer supply cannot be born due to the insufficient bearing capacity of the tie switch is caused at two sides of the tie switch, thereby influencing the power supply reliability.
Disclosure of Invention
The invention provides a distribution network line tie-down switch point selection method, a distribution network line tie-down switch point selection device and a storage medium, which solve the technical problems that the distribution network line tie-down switch point selection scheme is manually specified, systematic analysis is not performed according to the load conditions on two sides of a tie-down switch, and the power supply reliability is easily affected due to unreasonable tie-down switch distribution.
The first aspect of the present invention provides a distribution network line tie-down switch point selection method, which includes:
determining a trunk set and the number of target tie switches of a target substation;
Determining power supply schemes in different power supply directions according to the trunk line set to obtain a target power supply scheme set;
taking a tower and a cable tapping point as target endpoints, taking a line segment between two adjacent target endpoints as a corresponding target line segment, and calculating load redundancy data corresponding to different power supply schemes in the target power supply scheme set; the load redundancy data comprise load redundancy amounts of all target line segments when different target endpoints are feeder line ends;
determining a power supply range of a feeder switch serving as an upstream in a corresponding power supply scheme according to the load redundancy data;
determining a distribution point selection range of the interconnection switch on the distribution network line according to each power supply range;
performing point distribution in the determined point distribution selection range according to the number of the target tie switches to obtain alternative point distribution schemes;
calculating the minimum redundancy of the lines on different feeder switch sides under each alternative point distribution scheme to obtain a minimum redundancy set of the lines corresponding to each alternative point distribution scheme;
calculating the weight value of the corresponding alternative point distribution scheme according to the minimum redundancy amount set of the line;
and selecting an alternative point distribution scheme with the maximum weight value from the alternative point distribution schemes as an optimal point distribution scheme of the contact switch in the target transformer substation.
According to an implementation manner of the first aspect of the present invention, the calculating load redundancy data corresponding to different power supply schemes in the target power supply scheme set includes:
the load redundancy of each target line segment is calculated according to the following formula:
in the method, in the process of the invention,representing a target line segment->Load redundancy of->For the target line segment->Rated current of->For the target line segment->Is set in the above-described state.
According to one implementation manner of the first aspect of the present invention, the determining, according to the load redundancy data, a power-available range of a feeder switch as an upstream in a corresponding power supply scheme includes:
sequentially increasing the identification numbers of all target endpoints from an upstream feeder switch to a downstream feeder switch, and determining the identification number of the target endpoint meeting the load redundancy condition under the same power supply scheme as an alternative identification number according to the load redundancy data; the load redundancy condition is that the load redundancy quantity of any target line segment is smaller than a preset load redundancy quantity threshold when the corresponding target endpoint is used as the feeder end;
and selecting the largest alternative identification number from the alternative identification numbers as a target identification number, and taking a value obtained by subtracting 1 from the target identification number as an identification number capable of supplying power to a target endpoint to obtain a power-capable range serving as an upstream feeder switch in a corresponding power supply scheme.
According to one possible implementation manner of the first aspect of the present invention, the preset load redundancy amount threshold is 0.
According to one implementation manner of the first aspect of the present invention, the calculating the minimum redundancy of the lines on different feeder switch sides under each alternative point distribution scheme, to obtain a minimum redundancy set of the lines corresponding to each alternative point distribution scheme includes:
and taking the point distribution position of the tie switch in the alternative point distribution scheme as a target point distribution position, calculating the load redundancy amount of each target line segment between the feeder switch and the target point distribution position, and taking the minimum value of the load redundancy amount as the line minimum redundancy amount at the corresponding feeder switch side in the obtained load redundancy amount calculation result.
According to one implementation manner of the first aspect of the present invention, the calculating the weight value of the corresponding alternative point placement scheme according to the line minimum redundancy amount set includes:
judging whether the minimum redundancy of each circuit of the circuit minimum redundancy set is larger than 0;
if the minimum redundancy of each line of the line minimum redundancy set is larger than 0, selecting a corresponding preset weight value calculation formula to calculate the weight value of a corresponding alternative point distribution scheme according to the number of the main lines in the main line set;
If the minimum redundancy of each line of the minimum redundancy set of the lines is not more than 0, subtracting 1 from the number of the target tie switches, reforming the minimum redundancy set of the lines, and returning to judge whether the minimum redundancy of each line of the minimum redundancy set of the lines is more than 0 or not until the iteration stop condition is met; the iteration stop condition is that the minimum redundancy of each line in the current line minimum redundancy set is more than 0, or the number of target tie switches is reduced to 0;
if the number of the target interconnection switches is reduced to 0, the minimum redundancy of each line in the current line minimum redundancy set cannot be met, and information for prompting that the trunk set of the target substation cannot be effectively connected is output.
According to one implementation manner of the first aspect of the present invention, the selecting a corresponding preset weight value calculation formula according to the number of trunks in the trunk set to calculate a weight value of a corresponding alternative point distribution scheme includes:
when the number of the trunks in the trunk line set is 1, the number of the minimum redundancy line set of the corresponding alternative point distribution scheme is 2, and the weight value of the corresponding alternative point distribution scheme is calculated according to the following formula:
in the method, in the process of the invention, Representing an alternative point placement scheme->Weight value of->For alternative point arrangement scheme->Corresponding line minimum redundancy set, +.>For alternative point arrangement scheme->The 1 st line minimum redundancy in the corresponding line minimum redundancy set,/->For alternative point arrangement scheme->2 nd line minimum redundancy in the corresponding line minimum redundancy set,/->The weight value is preset;
when the number of the trunk lines in the trunk line set is larger than 1, calculating the weight value of the corresponding alternative point distribution scheme according to the following formula:
in the method, in the process of the invention,representing an alternative point placement scheme->Weight value of->For alternative point arrangement scheme->Corresponding line minimum redundancy set, +.>For alternative point arrangement scheme->The corresponding line minimum redundancy amount set +.>Minimum redundancy of individual lines, +.>For alternative point arrangement scheme->Variance of the corresponding line minimum redundancy set.
The second aspect of the present invention provides a distribution network line interconnection switch point selection device, including:
the first determining module is used for determining the trunk set of the target substation and the number of the target tie switches;
the second determining module is used for determining power supply schemes in different power supply directions according to the trunk line set to obtain a target power supply scheme set;
The first calculation module is used for taking a pole tower and a cable tapping point as target endpoints, taking a line segment between two adjacent target endpoints as a corresponding target line segment, and calculating load redundancy data corresponding to different power supply schemes in the target power supply scheme set; the load redundancy data comprise load redundancy amounts of all target line segments when different target endpoints are feeder line ends;
a third determining module, configured to determine a power-available range of the feeder switch serving as an upstream in the corresponding power supply scheme according to the load redundancy data;
a fourth determining module, configured to determine a distribution selection range of the tie switch on the distribution network line according to each of the power-available ranges;
the point setting module is used for setting points in the determined point setting selection range according to the number of the target tie switches to obtain each alternative point setting scheme;
the second calculation module is used for calculating the minimum redundancy of the lines on the different feeder switch sides under each alternative point distribution scheme to obtain a minimum redundancy set of the lines corresponding to each alternative point distribution scheme;
the third calculation module is used for calculating the weight value of the corresponding alternative point distribution scheme according to the line minimum redundancy amount set;
and the selecting module is used for selecting the alternative point distribution scheme with the maximum weight value from the alternative point distribution schemes as the optimal point distribution scheme of the contact switch in the target transformer substation.
According to one manner in which the second aspect of the present invention can be implemented, the first computing module includes:
a first calculation unit for calculating the load redundancy of each target line segment according to the following formula:
in the method, in the process of the invention,representing a target line segment->Load redundancy of->For the target line segment->Rated current of->For the target line segment->Is set in the above-described state.
According to one implementation manner of the second aspect of the present invention, the third determining module includes:
a first determining unit, configured to sequentially increase the identification numbers of the target endpoints from the upstream feeder switch to the downstream feeder switch, and determine, according to the load redundancy data, the identification number of the target endpoint satisfying the load redundancy condition under the same power supply scheme as an alternative identification number; the load redundancy condition is that the load redundancy quantity of any target line segment is smaller than a preset load redundancy quantity threshold when the corresponding target endpoint is used as the feeder end;
and the power-supply range analysis unit is used for selecting the largest alternative identification number from the alternative identification numbers as a target identification number, taking a value obtained by subtracting 1 from the target identification number as the identification number capable of supplying power to a target endpoint, and obtaining the power-supply range serving as the upstream feeder switch in the corresponding power supply scheme.
According to one possible implementation manner of the second aspect of the present invention, the preset load redundancy amount threshold is 0.
According to one manner in which the second aspect of the present invention can be implemented, the second computing module includes:
the second calculation unit is used for calculating the load redundancy amount of each target line segment between the feeder switch and the target point distribution position by taking the point distribution position of the tie switch in the alternative point distribution scheme as the target point distribution position, and taking the minimum value of the load redundancy amount as the line minimum redundancy amount at the corresponding feeder switch side in the obtained load redundancy amount calculation result.
According to one manner in which the second aspect of the present invention can be implemented, the third computing module includes:
the judging unit is used for judging whether the minimum redundancy of each circuit of the circuit minimum redundancy set is larger than 0;
a third calculation unit, configured to select a corresponding preset weight value calculation formula according to the number of trunks in the trunk set, and calculate a weight value of a corresponding alternative point distribution scheme if the minimum redundancy of each line in the line minimum redundancy set is greater than 0;
a value unit, configured to, if the minimum redundancy of each line in the minimum redundancy set of lines is not greater than 0, subtract 1 from the number of target tie switches, reform the minimum redundancy set of lines, and return to the determining unit until an iteration stop condition is satisfied; the iteration stop condition is that the minimum redundancy of each line in the current line minimum redundancy set is more than 0, or the number of target tie switches is reduced to 0;
And the output unit is used for outputting information for prompting that the trunk line set of the target transformer substation cannot be effectively connected if the minimum redundancy quantity of each line of the current line minimum redundancy quantity set is still not more than 0 when the number of the target connection switches is reduced to 0.
According to one possible implementation manner of the second aspect of the present invention, the third computing unit is specifically configured to:
when the number of the trunks in the trunk line set is 1, the number of the minimum redundancy line set of the corresponding alternative point distribution scheme is 2, and the weight value of the corresponding alternative point distribution scheme is calculated according to the following formula:
in the method, in the process of the invention,representing an alternative point placement scheme->Weight value of->For alternative point arrangement scheme->Corresponding line minimum redundancy set, +.>For alternative point arrangement scheme->The 1 st line minimum redundancy in the corresponding line minimum redundancy set,/->For alternative point arrangement scheme->2 nd line minimum redundancy in the corresponding line minimum redundancy set,/->The weight value is preset;
when the number of the trunk lines in the trunk line set is larger than 1, calculating the weight value of the corresponding alternative point distribution scheme according to the following formula:
in the method, in the process of the invention,representing an alternative point placement scheme->Weight value of->For alternative point arrangement scheme- >Corresponding line minimum redundancy set, +.>For alternative point arrangement scheme->The corresponding line minimum redundancy amount set +.>Minimum redundancy of individual lines, +.>For alternative point arrangement scheme->Variance of the corresponding line minimum redundancy set.
The third aspect of the present invention provides a distribution network line tie switch point selection device, comprising:
a memory for storing instructions; the instruction is used for realizing the distribution network line interconnection switch point selection method according to the mode which can be realized by any one of the above steps;
and the processor is used for executing the instructions in the memory.
A fourth aspect of the present invention is a computer readable storage medium, where a computer program is stored, where the computer program when executed by a processor implements a distribution network line contact switch point selection method according to any one of the above modes.
From the above technical scheme, the invention has the following advantages:
the method comprises the steps of determining a trunk set and the number of target tie switches of a target substation; determining power supply schemes in different power supply directions according to the trunk line set to obtain a target power supply scheme set; taking a tower and a cable tapping point as target endpoints, taking a line segment between two adjacent target endpoints as a corresponding target line segment, and calculating load redundancy data corresponding to different power supply schemes in the target power supply scheme set; the load redundancy data comprise load redundancy amounts of all target line segments when different target endpoints are feeder line ends; determining a power supply range of a feeder switch serving as an upstream in a corresponding power supply scheme according to the load redundancy data; determining a distribution point selection range of the interconnection switch on the distribution network line according to each power supply range; performing point distribution in the determined point distribution selection range according to the number of the target tie switches to obtain alternative point distribution schemes; calculating the minimum redundancy of the lines on different feeder switch sides under each alternative point distribution scheme to obtain a minimum redundancy set of the lines corresponding to each alternative point distribution scheme; calculating the weight value of the corresponding alternative point distribution scheme according to the minimum redundancy amount set of the line; selecting an alternative point distribution scheme with the maximum weight value from the alternative point distribution schemes as an optimal point distribution scheme of a contact switch in the target transformer substation; the invention carries out systematic analysis based on the load conditions at the two sides of the interconnection switch, provides a relatively balanced interconnection point selection method, ensures that the distribution of the interconnection switch is more reasonable, and effectively improves the power supply reliability.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are used 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 other drawings can be obtained from these drawings without inventive faculty for a person skilled in the art.
Fig. 1 is a flowchart of a distribution network line tie-down point selection method according to an alternative embodiment of the present invention;
fig. 2 is a schematic diagram of a distribution network according to an alternative embodiment of the present invention;
fig. 3 is a schematic diagram of a distribution network according to another alternative embodiment of the present invention;
fig. 4 is a block diagram illustrating the structural connection of a distribution network line interconnection switch point selection device according to an alternative embodiment of the present invention.
Reference numerals:
fig. 2 and 3:
10kV feeder switches of K1, K2 and K3-substations; z11, Z12, Z62, Z61, Z21, Z22, Z31, Z32, Z41, Z42, Z51, Z52, F1, F2, F3, F4, F5, F7, F8, F9, F10, F11, F12, F13, F14, F15-towers (or cable tapping points); f6 and Z13 are connected with the pole tower;
In fig. 4:
1-a first determination module; 2-a second determination module; 3-a first computing module; 4-a third determination module; 5-a fourth determination module; 6-a point distribution module; 7-a second calculation module; 8-a third calculation module; 9-selecting a module.
Detailed Description
The embodiment of the invention provides a distribution network line tie-down switch point selection method, a distribution network line tie-down switch point selection device and a storage medium, which are used for solving the technical problems that the distribution network line tie-down switch point selection scheme is manually specified, systematic analysis is not performed according to the load conditions on two sides of a tie-down switch, and the power supply reliability is easily affected due to unreasonable tie-down switch distribution.
In order to make the objects, features and advantages of the present invention more comprehensible, the technical solutions in the embodiments of the present invention are described in detail below with reference to the accompanying drawings, and it is apparent that the embodiments described below are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention provides a distribution network line interconnection switch distribution point selection method.
Referring to fig. 1, fig. 1 is a flowchart illustrating a distribution network line interconnection switch point selection method according to an embodiment of the present invention.
The distribution network line interconnection switch distribution point selection method provided by the embodiment of the invention comprises the steps S1-S9.
And step S1, determining a trunk set of the target substation and the number of target tie switches.
The target transformer substation is a transformer substation needing distribution network line interconnection switch distribution selection.
When the trunk line set of the target transformer substation is determined, starting from the feeder line switch at the beginning of the transformer substation, and assuming that all the switches are in a combined position according to the network topology of the transformer substation, if the number of other found feeder line switches is N, the number of the trunk lines is N, so that the N trunk lines construct the trunk line set.
The number of the target tie switches is the number of tie switches which are required to be distributed in the distribution network line of the target transformer substation by manual specification, the number can be set according to actual conditions, and the setting range of the number of the tie switches cannot exceed the number of the trunk lines. For example, when the number of trunks is N, a corresponding number may be designated between 1 and N as the target number of tie switches.
And step S2, determining power supply schemes in different power supply directions according to the trunk line set to obtain a target power supply scheme set.
And for each trunk line, taking each feeder line switch on the trunk line as an upstream to obtain a power supply scheme in a corresponding power supply direction.
FIG. 2 is a schematic diagram of a distribution network according to an alternative embodiment of the present invention; fig. 3 shows a schematic diagram of a distribution network according to another alternative embodiment of the present invention. In fig. 2-3, the distribution network line comprises 3 10kV feeder lines, namely a 10kV feeder switch K1 of a transformer substation, a 10kV feeder switch K2 of the transformer substation and a 10kV feeder switch K3 of the transformer substation. The solid diamond points are towers (or cable tapping points), namely each solid diamond point Z11, Z12, Z62, Z61, Z21, Z22, Z31, Z32, Z41, Z42, Z51, Z52, F1, F2, F3, F4, F5, F7, F8, F9, F10, F11, F12, F13, F14 and F15 are target towers, and the hollow diamond points are connecting towers among feeder lines, namely the hollow diamond points F6 and Z13 are connecting towers. There is a branch 2 user 1 under the target tower Z21, a branch 2 user 2 and a branch 2 user n under the target tower Z22, a branch 3 user 1 under the target tower Z31, a branch 3 user 2 and a branch 3 user n under the target tower Z32, a branch 4 user 1 under the target tower Z41, a branch 4 user 2 and a branch 4 user n under the target tower Z42, a branch 5 user 1 under the target tower Z51, a branch 5 user 2 and a branch 5 user n under the target tower Z32, a branch 1 user 2 under the target tower Z12, a branch 6 user 2 under the target tower Z62, a branch 6 user 1 under the target tower Z61, and a branch 1 user 1 under the target tower Z11.
As an example, as shown in fig. 2, the distribution network line includes a trunk line between a 10kV feeder switch K1 of a substation and a 10kV feeder switch K2 of the substation, each diamond point is a tower (or a cable tapping point), and a plurality of towers (or cable tapping points) are connected with branch users. The method comprises the steps that a 10kV feeder switch K1 of a transformer substation is arranged at the upstream, a 10kV feeder switch K2 of the transformer substation is arranged at the downstream, and a power supply scheme with a power supply direction from the 10kV feeder switch K1 of the transformer substation to the 10kV feeder switch K2 of the transformer substation is obtained; the method comprises the steps that a 10kV feeder switch K2 of a transformer substation is arranged at the upstream, a 10kV feeder switch K1 of the transformer substation is arranged at the downstream, and a power supply scheme with a power supply direction from the 10kV feeder switch K2 of the transformer substation to the 10kV feeder switch K1 of the transformer substation is obtained; finally, a target power supply scheme set formed by the two power supply schemes is obtained.
As yet another example, as shown in fig. 3, the distribution network line includes two trunks, which are a trunk between the substation 10kV feeder switch K1 and the substation 10kV feeder switch K2, and a trunk between the substation 10kV feeder switch K1 and the substation 10kV feeder switch K3, respectively. Each diamond point is a tower (or a cable tapping point), and a plurality of towers (or cable tapping points) are connected with branch users. The method comprises the steps that a 10kV feeder switch K2 of a transformer substation is arranged at the upstream, a 10kV feeder switch K1 of the transformer substation is arranged at the downstream, and a power supply scheme with a power supply direction from the 10kV feeder switch K2 of the transformer substation to the 10kV feeder switch K1 of the transformer substation is obtained; the method comprises the steps that a 10kV feeder switch K3 of a transformer substation is arranged at the upstream, a 10kV feeder switch K1 of the transformer substation is arranged at the downstream, and a power supply scheme with a power supply direction from the 10kV feeder switch K3 of the transformer substation to the 10kV feeder switch K1 of the transformer substation is obtained; the method comprises the steps that a 10kV feeder switch K1 of a transformer substation is arranged at the upstream, a 10kV feeder switch K2 of the transformer substation, a 10kV feeder switch K3 of the transformer substation and a tail end tower F15 are arranged at the downstream, and a power supply scheme with power supply directions from the 10kV feeder switch K1 of the transformer substation to the 10kV feeder switch K2 of the transformer substation, the 10kV feeder switch K3 of the transformer substation and the tail end tower F15 is obtained; and finally obtaining a target power supply scheme set formed by the three power supply schemes.
And S3, taking the tower and the cable tapping point as target endpoints, taking a line segment between two adjacent target endpoints as a corresponding target line segment, and calculating load redundancy data corresponding to different power supply schemes in the target power supply scheme set.
The load redundancy data comprise load redundancy amounts of all target line segments when different target endpoints are feeder line ends.
In one implementation manner, the calculating load redundancy data corresponding to different power supply schemes in the target power supply scheme set includes:
the load redundancy of each target line segment is calculated according to the following formula:
in the method, in the process of the invention,representing a target line segment->Load redundancy of->For the target line segment->Rated current of->For the target line segment->Is set in the above-described state.
The method for calculating the load current of the target line segment can refer to the prior art. For target line segmentsThe load current is +.>Rated current +.>Let branch->User->Is +.>As an example, as shown in FIG. 2, the load current of the segment between the target terminals F5 and F6 is +.>Load current of branch 4 user 1 is +.>Load currentIs a tower->And->The sum of the user load current of each branch and the load current of the downstream adjacent line segment, wherein the target endpoint +. >And->The branch load is counted into the upstream line segment, the target endpoint F4 is the upstream and the target endpoint F5 is the downstream, and if the line end is the target endpoint F6, then:
in the method, in the process of the invention,load current for the line segment between the target terminals F4 and F5, +.>For the load current at the target endpoint F5, +.>For target end point F5 andload current of line segment between branch 4 and user 1, < >>Load current for the line segment between branch 4 user 1 and branch 4 user 2, +.>Load current for branch 4 user 2, +.>User +.>Is set in the above-described state; />
Let the target endpoint F4 be downstream and the target endpoint F5 be upstream, assuming that the line end is the target endpoint F6:
in the method, in the process of the invention,for the load current at the target endpoint F4, +.>Load current for the line segment between the target terminals F3 and F4, < >>Load current for line segment between target endpoint F4 and branch 3 user 1, +.>Load current for the line segment between branch 3 user 1 and branch 3 user 2, +.>Load current for branch 3 user 1, +.>Load current for branch 3 user 2, +.>User +.>Is set in the above-described state.
And S4, determining the powerable range of the feeder switch serving as the upstream in the corresponding power supply scheme according to the load redundancy data.
In one implementation manner, the determining the powerable range of the feeder switch as the upstream in the corresponding power supply scheme according to the load redundancy data includes:
Sequentially increasing the identification numbers of all target endpoints from an upstream feeder switch to a downstream feeder switch, and determining the identification number of the target endpoint meeting the load redundancy condition under the same power supply scheme as an alternative identification number according to the load redundancy data; the load redundancy condition is that the load redundancy quantity of any target line segment is smaller than a preset load redundancy quantity threshold when the corresponding target endpoint is used as the feeder end;
and selecting the largest alternative identification number from the alternative identification numbers as a target identification number, and taking a value obtained by subtracting 1 from the target identification number as an identification number capable of supplying power to a target endpoint to obtain a power-capable range serving as an upstream feeder switch in a corresponding power supply scheme.
In one implementation, the pre-load redundancy amount threshold is 0.
As an example, when calculating the powerable range of the feeder switch as upstream in the corresponding power scheme for the distribution network line shown in fig. 2, specific execution is performed:
aiming at a power supply scheme with power supply directions from a 10kV feeder switch K1 of a transformer substation to a 10kV feeder switch K2 of the transformer substation, the identification numbers of target endpoints are increased sequentially from the 10kV feeder switch K1 of the transformer substation to the 10kV feeder switch K2 of the transformer substation, and each target endpoint is calculated to be each line segment under the feeder terminal Is arbitrary given that the terminal is at the target endpoint MThen the substation 10kV feeder switch K1 can supply power to the M-1 target endpoint;
aiming at a power supply scheme with a power supply direction from a 10kV feeder switch K2 of a transformer substation to a 10kV feeder switch K1 of the transformer substation, the identification numbers of target endpoints are increased sequentially from the 10kV feeder switch K2 of the transformer substation to the 10kV feeder switch K1 of the transformer substation, and each target endpoint is calculated to be each line segment under the feeder terminalIs given by the terminal at the tower N, optionally +.>Then the substation 10kV feeder switch K2 may supply power to the No. N-1 tower.
As another example, when calculating the powerable range of the feeder switch as the upstream in the corresponding power scheme for the distribution network line shown in fig. 3, specific execution is performed:
aiming at a power supply scheme with a power supply direction from a 10kV feeder switch K2 of a transformer substation to a 10kV feeder switch K1 of the transformer substation, the identification numbers of target endpoints are increased sequentially from the 10kV feeder switch K2 of the transformer substation to the 10kV feeder switch K1 of the transformer substation, and each target endpoint is calculated to be each line segment under the feeder terminalIs given by the value of (1) assuming that the terminal is at the target terminal N, optionally +.>Then the 10kV feeder switch K1 of the transformer substation can supply power to the N-1 target endpoint;
aiming at a power supply scheme with a power supply direction from a 10kV feeder switch K3 of a transformer substation to a 10kV feeder switch K1 of the transformer substation, the identification numbers of target endpoints are increased sequentially from the 10kV feeder switch K3 of the transformer substation to the 10kV feeder switch K1 of the transformer substation, and each target endpoint is calculated to be each line segment under the feeder terminal Is given by the value of (1) assuming that the terminal is at the target terminal Q, optionally +.>Then the substation 10kV feeder switch K3 can supply power to a Q-1 target endpoint;
aiming at a power supply scheme with power supply directions from a 10kV feeder switch K1 of a transformer substation to a 10kV feeder switch K2 of the transformer substation, a 10kV feeder switch K3 of the transformer substation and a tail end tower F15, each tower is calculated to be each line segment under the tail end of a feederIs assumed to be at end 1 on the tower N-1 and at end 2 on the tower M1, optionally +.>The method comprises the steps of carrying out a first treatment on the surface of the Terminal 1 on Q-1 tower and terminal 2 on M2 tower, optionally +.>Then the 10kV feeder switch K1 of the transformer substation can supply power to the M1-1 pole towers and the M2-1 pole towers.
And S5, determining the distribution point selection range of the interconnection switch on the distribution network line according to each power supply range.
For example, for the distribution network line shown in fig. 2, when the substation 10kV feeder switch K1 can supply power to the M-1 target endpoint and the substation 10kV feeder switch K2 can supply power to the N-1 target endpoint, the distribution selection range of the contact switch on the distribution network line is the range between the M-1 target endpoint and the N-1 target endpoint. For the distribution network line shown in fig. 3, the substation 10kV feeder switch K1 can supply power to the N-1 target endpoint, the substation 10kV feeder switch K3 can supply power to the Q-1 target endpoint, and when the substation 10kV feeder switch K1 can supply power to the M1-1 and M2-1 towers, the distribution point selection range of the contact switch on the distribution network line is as follows: between the M1-1 target endpoint and the Q-1 target endpoint, and between the M2-1 target endpoint and the N-1 target endpoint.
It should be noted that, because the identification numbers of the same target endpoint under different power supply schemes are different, when the distribution selection range of the tie switch on the distribution network line is determined according to each power supply range, the target endpoint of the power supply range can be marked, and the target endpoint of the mark number is re-marked by adopting the same identification number setting standard, so as to obtain the distribution selection range of the tie switch on the distribution network line.
And S6, carrying out point distribution in the determined point distribution selection range according to the number of the target interconnection switches to obtain each alternative point distribution scheme.
And S7, calculating the minimum redundancy of the lines on different feeder switch sides under each alternative point distribution scheme to obtain a minimum redundancy set of the lines corresponding to each alternative point distribution scheme.
In one implementation manner, the calculating the minimum redundancy of the lines on different feeder switch sides under each alternative point distribution scheme to obtain a minimum redundancy set of the lines corresponding to each alternative point distribution scheme includes:
and taking the point distribution position of the tie switch in the alternative point distribution scheme as a target point distribution position, calculating the load redundancy amount of each target line segment between the feeder switch and the target point distribution position, and taking the minimum value of the load redundancy amount as the line minimum redundancy amount at the corresponding feeder switch side in the obtained load redundancy amount calculation result.
And S8, calculating the weight value of the corresponding alternative point distribution scheme according to the line minimum redundancy amount set.
In one implementation manner, the calculating the weight value of the corresponding alternative point placement scheme according to the line minimum redundancy amount set includes:
judging whether the minimum redundancy of each circuit of the circuit minimum redundancy set is larger than 0;
if the minimum redundancy of each line of the line minimum redundancy set is larger than 0, selecting a corresponding preset weight value calculation formula to calculate the weight value of a corresponding alternative point distribution scheme according to the number of the main lines in the main line set;
if the minimum redundancy of each line of the minimum redundancy set of the lines is not more than 0, subtracting 1 from the number of the target tie switches, reforming the minimum redundancy set of the lines, and returning to judge whether the minimum redundancy of each line of the minimum redundancy set of the lines is more than 0 or not until the iteration stop condition is met; the iteration stop condition is that the minimum redundancy of each line in the current line minimum redundancy set is more than 0, or the number of target tie switches is reduced to 0;
if the number of the target interconnection switches is reduced to 0, the minimum redundancy of each line in the current line minimum redundancy set cannot be met, and information for prompting that the trunk set of the target substation cannot be effectively connected is output.
In one implementation manner, the selecting a corresponding preset weight value calculation formula according to the number of the trunks in the trunk set to calculate the weight value of the corresponding alternative point distribution scheme includes:
when the number of the trunks in the trunk line set is 1, the number of the minimum redundancy line set of the corresponding alternative point distribution scheme is 2, and the weight value of the corresponding alternative point distribution scheme is calculated according to the following formula:
in the method, in the process of the invention,representing an alternative point placement scheme->Weight value of->For alternative point arrangement scheme->Corresponding line minimum redundancy set, +.>For alternative point arrangement scheme->The 1 st line minimum redundancy in the corresponding line minimum redundancy set,/->For alternative point arrangement scheme->2 nd line minimum redundancy in the corresponding line minimum redundancy set,/->The weight value is preset;
when the number of the trunk lines in the trunk line set is larger than 1, calculating the weight value of the corresponding alternative point distribution scheme according to the following formula:
in the method, in the process of the invention,representing an alternative point placement scheme->Weight value of->For alternative point arrangement scheme->Corresponding line minimum redundancy set, +.>For alternative point arrangement scheme->The corresponding line minimum redundancy amount set +.>Minimum redundancy of individual lines, +. >For alternative point arrangement scheme->Corresponding line minimum redundancy amount setIs a variance of (c).
And S9, selecting an alternative point distribution scheme with the maximum weight value from the alternative point distribution schemes as an optimal point distribution scheme of the contact switch in the target transformer substation.
As an example, if the number of tie switches n=2 is assumed when traversing each tower in the selection range, when the tie switches are in a certain tower P1, P2 in the selection range, the method is called a scheme P, and the line on the 10kV feeder switch K1 side of the substation is minimized,/>Between a 10kV feeder switch K1 of a transformer substation and towers p1 and p2, the minimum redundancy of a line at the side of the 10kV feeder switch K2 of the transformer substation is +.>,/>Between a 10kV feeder switch K2 of a transformer substation and p1 and p2, the minimum redundancy of a line at the K3 side of the 10kV feeder switch of the transformer substation is +.>,/>Between the substation 10kV feeder switches K3 and p1, p 2. When->、/>、/>Are all greater than 0, assuming that the weight value is +.>And when the power supply is maximum, the scheme P is the optimal scheme of the interconnection switch. When->、/>、/>The scheme p can not meet n=2 linking switches, the number of target linking switches is reduced by 1, at the moment, the number of target linking switches is less than the number of target feeder lines, a line minimum redundancy set is formed again, whether the minimum redundancy of each line is greater than 0 is judged again, and then a weight value is calculated > 。When the number of the target interconnection switches is reduced to zero, the condition that the minimum redundancy of each line is larger than 0 cannot be met, the trunk sets of the target transformer substation cannot be effectively connected, and corresponding prompt information is output at the moment.
According to the embodiment of the invention, the systematic analysis is performed based on the load conditions at the two sides of the tie switch, and a relatively balanced tie point selection method is provided, so that the tie switch distribution is more reasonable, and the power supply reliability can be effectively improved.
The invention also provides a distribution network line interconnection switch point selection device which can be used for executing the distribution network line interconnection switch point selection method according to any one of the embodiments of the invention.
Referring to fig. 4, fig. 4 is a block diagram showing structural connection of a distribution network line interconnection switch point selection device according to an embodiment of the present invention.
The distribution network line interconnection switch point selection device provided by the embodiment of the invention comprises:
a first determining module 1, configured to determine a trunk set and a target tie switch number of a target substation;
a second determining module 2, configured to determine power supply schemes in different power supply directions according to the trunk line set, so as to obtain a target power supply scheme set;
The first calculating module 3 is configured to calculate load redundancy data corresponding to different power supply schemes in the target power supply scheme set by using a tower and a cable tapping point as target endpoints and a line segment between two adjacent target endpoints as a corresponding target line segment; the load redundancy data comprise load redundancy amounts of all target line segments when different target endpoints are feeder line ends;
a third determining module 4, configured to determine a powerable range of a feeder switch serving as an upstream in a corresponding power supply scheme according to the load redundancy data;
a fourth determining module 5, configured to determine a distribution selection range of the tie switch on the distribution network line according to each of the power-available ranges;
the point setting module 6 is used for setting points in the determined point setting selection range according to the number of the target tie switches to obtain various alternative point setting schemes;
the second calculating module 7 is configured to calculate the minimum redundancy of the lines on different feeder switch sides under each alternative point distribution scheme, so as to obtain a minimum redundancy set of the lines corresponding to each alternative point distribution scheme;
a third calculation module 8, configured to calculate a weight value of a corresponding alternative point distribution scheme according to the line minimum redundancy amount set;
And the selecting module 9 is used for selecting the alternative point distribution scheme with the maximum weight value from the alternative point distribution schemes as the optimal point distribution scheme of the contact switch in the target transformer substation.
In one possible implementation, the first computing module 3 includes:
a first calculation unit for calculating the load redundancy of each target line segment according to the following formula:
in the method, in the process of the invention,representing a target line segment->Is a load redundancy of (a)Allowance (L)>For the target line segment->Rated current of->For the target line segment->Is set in the above-described state.
In one possible implementation, the third determining module 4 includes:
a first determining unit, configured to sequentially increase the identification numbers of the target endpoints from the upstream feeder switch to the downstream feeder switch, and determine, according to the load redundancy data, the identification number of the target endpoint satisfying the load redundancy condition under the same power supply scheme as an alternative identification number; the load redundancy condition is that the load redundancy quantity of any target line segment is smaller than a preset load redundancy quantity threshold when the corresponding target endpoint is used as the feeder end;
and the power-supply range analysis unit is used for selecting the largest alternative identification number from the alternative identification numbers as a target identification number, taking a value obtained by subtracting 1 from the target identification number as the identification number capable of supplying power to a target endpoint, and obtaining the power-supply range serving as the upstream feeder switch in the corresponding power supply scheme.
In one implementation, the pre-load redundancy amount threshold is 0.
In one possible implementation, the second computing module 7 includes:
the second calculation unit is used for calculating the load redundancy amount of each target line segment between the feeder switch and the target point distribution position by taking the point distribution position of the tie switch in the alternative point distribution scheme as the target point distribution position, and taking the minimum value of the load redundancy amount as the line minimum redundancy amount at the corresponding feeder switch side in the obtained load redundancy amount calculation result.
In one possible implementation, the third computing module 8 includes:
the judging unit is used for judging whether the minimum redundancy of each circuit of the circuit minimum redundancy set is larger than 0;
a third calculation unit, configured to select a corresponding preset weight value calculation formula according to the number of trunks in the trunk set, and calculate a weight value of a corresponding alternative point distribution scheme if the minimum redundancy of each line in the line minimum redundancy set is greater than 0;
a value unit, configured to, if the minimum redundancy of each line in the minimum redundancy set of lines is not greater than 0, subtract 1 from the number of target tie switches, reform the minimum redundancy set of lines, and return to the determining unit until an iteration stop condition is satisfied; the iteration stop condition is that the minimum redundancy of each line in the current line minimum redundancy set is more than 0, or the number of target tie switches is reduced to 0;
And the output unit is used for outputting information for prompting that the trunk line set of the target transformer substation cannot be effectively connected if the minimum redundancy quantity of each line of the current line minimum redundancy quantity set is still not more than 0 when the number of the target connection switches is reduced to 0.
In one implementation manner, the third computing unit is specifically configured to:
when the number of the trunks in the trunk line set is 1, the number of the minimum redundancy line set of the corresponding alternative point distribution scheme is 2, and the weight value of the corresponding alternative point distribution scheme is calculated according to the following formula:
in the method, in the process of the invention,representing an alternative point placement scheme->Weight value of->For alternative point arrangement scheme->Corresponding line minimum redundancy set, +.>For alternative point arrangement scheme->The 1 st line minimum redundancy in the corresponding line minimum redundancy set,/->For alternative point arrangement scheme->2 nd line minimum redundancy in the corresponding line minimum redundancy set,/->The weight value is preset;
when the number of the trunk lines in the trunk line set is larger than 1, calculating the weight value of the corresponding alternative point distribution scheme according to the following formula:
in the method, in the process of the invention,representing an alternative point placement scheme->Weight value of->For alternative point arrangement scheme->Corresponding line minimum redundancy set, +. >Is an alternative clothDot plan->The corresponding line minimum redundancy amount set +.>Minimum redundancy of individual lines, +.>For alternative point arrangement scheme->Variance of the corresponding line minimum redundancy set.
The invention also provides a distribution network line tie switch point selection device, which comprises:
a memory for storing instructions; the instruction is used for realizing the distribution network line interconnection switch distribution point selection method according to any one of the embodiments;
and the processor is used for executing the instructions in the memory.
The invention also provides a computer readable storage medium, wherein the computer readable storage medium stores a computer program, and the computer program realizes the distribution network line interconnection switch point selection method according to any one of the embodiments when being executed by a processor.
It will be clearly understood by those skilled in the art that, for convenience and brevity of description, specific working processes of the above-described apparatus, modules and units may refer to corresponding processes in the foregoing method embodiments, and specific beneficial effects of the above-described apparatus, modules and units may refer to corresponding beneficial effects in the foregoing method embodiments, which are not repeated herein.
In the several embodiments provided in this application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the apparatus embodiments described above are merely illustrative, and for example, the division of the modules is merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple modules or components may be combined or integrated into another apparatus, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or modules, which may be in electrical, mechanical, or other forms.
The modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical modules, i.e., may be located in one place, or may be distributed over a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional module in each embodiment of the present invention may be integrated into one processing module, or each module may exist alone physically, or two or more modules may be integrated into one module. The integrated modules may be implemented in hardware or in software functional modules.
The integrated modules, if implemented in the form of software functional modules and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (RAM, random Access Memory), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
The above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. The distribution network line interconnection switch distribution point selection method is characterized by comprising the following steps of:
determining a trunk set and the number of target tie switches of a target substation;
determining power supply schemes in different power supply directions according to the trunk line set to obtain a target power supply scheme set;
taking a tower and a cable tapping point as target endpoints, taking a line segment between two adjacent target endpoints as a corresponding target line segment, and calculating load redundancy data corresponding to different power supply schemes in the target power supply scheme set; the load redundancy data comprise load redundancy amounts of all target line segments when different target endpoints are feeder line ends;
determining a power supply range of a feeder switch serving as an upstream in a corresponding power supply scheme according to the load redundancy data;
determining a distribution point selection range of the interconnection switch on the distribution network line according to each power supply range;
performing point distribution in the determined point distribution selection range according to the number of the target tie switches to obtain alternative point distribution schemes;
calculating the minimum redundancy of the lines on different feeder switch sides under each alternative point distribution scheme to obtain a minimum redundancy set of the lines corresponding to each alternative point distribution scheme;
Calculating the weight value of the corresponding alternative point distribution scheme according to the minimum redundancy amount set of the line;
and selecting an alternative point distribution scheme with the maximum weight value from the alternative point distribution schemes as an optimal point distribution scheme of the contact switch in the target transformer substation.
2. The distribution network line tie-down point selection method according to claim 1, wherein the calculating load redundancy data corresponding to different power supply schemes in the target power supply scheme set includes:
the load redundancy of each target line segment is calculated according to the following formula:
3. The distribution network line tie-down switch distribution selection method according to claim 1, wherein determining a power-available range of a feeder switch as an upstream in a corresponding power supply scheme according to the load redundancy data comprises:
sequentially increasing the identification numbers of all target endpoints from an upstream feeder switch to a downstream feeder switch, and determining the identification number of the target endpoint meeting the load redundancy condition under the same power supply scheme as an alternative identification number according to the load redundancy data; the load redundancy condition is that the load redundancy quantity of any target line segment is smaller than a preset load redundancy quantity threshold when the corresponding target endpoint is used as the feeder end;
And selecting the largest alternative identification number from the alternative identification numbers as a target identification number, and taking a value obtained by subtracting 1 from the target identification number as an identification number capable of supplying power to a target endpoint to obtain a power-capable range serving as an upstream feeder switch in a corresponding power supply scheme.
4. A distribution network line tie-down point selection method according to claim 3, wherein the preset load redundancy amount threshold is 0.
5. The distribution network line interconnection switch distribution point selection method according to claim 1, wherein the calculating the line minimum redundancy amounts of different feeder switch sides under each alternative distribution point scheme to obtain the line minimum redundancy amount set corresponding to each alternative distribution point scheme includes:
and taking the point distribution position of the tie switch in the alternative point distribution scheme as a target point distribution position, calculating the load redundancy amount of each target line segment between the feeder switch and the target point distribution position, and taking the minimum value of the load redundancy amount as the line minimum redundancy amount at the corresponding feeder switch side in the obtained load redundancy amount calculation result.
6. The distribution network line tie switch point selection method according to claim 1, wherein the calculating the weight value of the corresponding alternative point arrangement scheme according to the line minimum redundancy amount set includes:
Judging whether the minimum redundancy of each circuit of the circuit minimum redundancy set is larger than 0;
if the minimum redundancy of each line of the line minimum redundancy set is larger than 0, selecting a corresponding preset weight value calculation formula to calculate the weight value of a corresponding alternative point distribution scheme according to the number of the main lines in the main line set;
if the minimum redundancy of each line of the minimum redundancy set of the lines is not more than 0, subtracting 1 from the number of the target tie switches, reforming the minimum redundancy set of the lines, and returning to judge whether the minimum redundancy of each line of the minimum redundancy set of the lines is more than 0 or not until the iteration stop condition is met; the iteration stop condition is that the minimum redundancy of each line in the current line minimum redundancy set is more than 0, or the number of target tie switches is reduced to 0;
if the number of the target interconnection switches is reduced to 0, the minimum redundancy of each line in the current line minimum redundancy set cannot be met, and information for prompting that the trunk set of the target substation cannot be effectively connected is output.
7. The distribution network line tie-down point selection method according to claim 6, wherein selecting a corresponding preset weight value calculation formula according to the number of trunks in the trunk set to calculate a weight value of a corresponding alternative point placement scheme includes:
When the number of the trunks in the trunk line set is 1, the number of the minimum redundancy line set of the corresponding alternative point distribution scheme is 2, and the weight value of the corresponding alternative point distribution scheme is calculated according to the following formula:
in the method, in the process of the invention,representing an alternative point placement scheme->Weight value of->For alternative point arrangement scheme->Corresponding line minimum redundancy set, +.>For alternative point arrangement scheme->The 1 st line minimum redundancy in the corresponding line minimum redundancy set,/->For alternative point arrangement scheme->2 nd line minimum redundancy in the corresponding line minimum redundancy set,/->The weight value is preset;
when the number of the trunk lines in the trunk line set is larger than 1, calculating the weight value of the corresponding alternative point distribution scheme according to the following formula:
in the method, in the process of the invention,representing an alternative point placement scheme->Weight value of->For alternative point arrangement scheme->Corresponding line minimum redundancy set, +.>For alternative point arrangement scheme->The corresponding line minimum redundancy amount set +.>Minimum redundancy of individual lines, +.>For alternative point arrangement scheme->Variance of the corresponding line minimum redundancy set.
8. Distribution network line tie switch distribution selecting device, characterized by comprising:
the first determining module is used for determining the trunk set of the target substation and the number of the target tie switches;
The second determining module is used for determining power supply schemes in different power supply directions according to the trunk line set to obtain a target power supply scheme set;
the first calculation module is used for taking a pole tower and a cable tapping point as target endpoints, taking a line segment between two adjacent target endpoints as a corresponding target line segment, and calculating load redundancy data corresponding to different power supply schemes in the target power supply scheme set; the load redundancy data comprise load redundancy amounts of all target line segments when different target endpoints are feeder line ends;
a third determining module, configured to determine a power-available range of the feeder switch serving as an upstream in the corresponding power supply scheme according to the load redundancy data;
a fourth determining module, configured to determine a distribution selection range of the tie switch on the distribution network line according to each of the power-available ranges;
the point setting module is used for setting points in the determined point setting selection range according to the number of the target tie switches to obtain each alternative point setting scheme;
the second calculation module is used for calculating the minimum redundancy of the lines on the different feeder switch sides under each alternative point distribution scheme to obtain a minimum redundancy set of the lines corresponding to each alternative point distribution scheme;
The third calculation module is used for calculating the weight value of the corresponding alternative point distribution scheme according to the line minimum redundancy amount set;
and the selecting module is used for selecting the alternative point distribution scheme with the maximum weight value from the alternative point distribution schemes as the optimal point distribution scheme of the contact switch in the target transformer substation.
9. Distribution network line tie switch distribution selecting device, characterized by comprising:
a memory for storing instructions; wherein the instruction is used for implementing the distribution network line interconnection switch distribution point selection method according to any one of claims 1-7;
and the processor is used for executing the instructions in the memory.
10. A computer readable storage medium, wherein a computer program is stored on the computer readable storage medium, and when executed by a processor, the computer program implements the distribution network line contact switch point selection method according to any one of claims 1-7.
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