CN115062443A - Normalized utilization method of power distribution network in current situation network frame - Google Patents
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Abstract
The invention relates to a method for utilizing a power distribution network in a normalized mode in a current network frame, which comprises the following steps: modeling power distribution network equipment, a land parcel, a power supply partition and a power supply unit; analyzing the topology of the current power grid, dividing the alternative paths into four types, namely an inter-station path, a co-station path, a radiation path and an isolated topology island path, analyzing the trunk parts of the four types of paths respectively and calculating the trunk length; calculating the mapping benefit of the power supply unit when the power supply unit utilizes the alternative path through the generated mapping between the power supply unit and the alternative path, and taking the optimal benefit as the corresponding relation of the power supply unit utilizing the current power grid; and (3) taking the scheme with the best economy obtained after analyzing all the power supply units and the current power grid as the final scheme utilized in the perspective grid. The normalized utilization of the current power grid fully considers the optimal cost of the power supply unit access of the distant view grid, and avoids the waste of recycling.
Description
Technical Field
The invention belongs to the technical field of power grid planning, and particularly relates to a method for utilizing a power distribution network in a normalized mode in a current grid structure.
Background
With the development of economic technology, electric energy becomes a indispensable secondary energy in production and life of people, and brings endless convenience to production and life of people. Along with the diversification and interaction of source, load and storage equipment in the power grid, the uncertainty and randomness of the operation of the power distribution network are stronger and stronger, and the operation scene is increasingly complex.
In the existing power distribution network planning, the utilization of the current power grid still stays in a manual stage, no information intelligent algorithm is used for supporting, and the rationality of the current power grid utilization seriously depends on the experience of planning personnel. The method comprises the steps of manually analyzing problems existing in the current power grid, and then shunting or switching the power grid on the basis of analyzing the problems. The current power grid cannot be transformed and utilized from the perspective of a distant view grid frame by manpower in planning, so that the repeated and wasted investment of dismantling and rebuilding the current power grid is caused.
Disclosure of Invention
The invention aims to provide a method for utilizing a power distribution network in a current grid in a normalized mode, which overcomes the defects of the prior art, fully considers the optimal cost of the power supply unit access of a distant view grid in the normalized utilization of the current grid, thereby realizing the one-time utilization of the current grid and avoiding the waste of repeated utilization.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a method for normalizing and utilizing a power distribution network in a current net rack comprises the following steps:
step one, modeling power distribution network equipment, a land parcel, a power supply partition and a power supply unit;
analyzing the topology of the current power grid, dividing the alternative paths into four types, namely an inter-station path, a co-station path, a radiation path and an isolated topology island path, analyzing a trunk part of the four types of paths respectively and calculating the length of the trunk;
step three, calculating the mapping benefit of the power supply unit when the power supply unit utilizes the alternative path through the generated mapping between the power supply unit and the alternative path, and taking the optimal benefit as the corresponding relation of the power supply unit utilizing the current power grid;
and step four, taking the scheme with the best economy obtained after all the power supply units and the current power grid are analyzed as the final scheme utilized in the perspective net rack.
Further, in the second step, the inter-station path is composed of two contact feeders, the substations to which the two feeders belong are different, the co-station path is composed of two contact feeders, the substations to which the two feeders belong are the same, the radiation line path is a co-station path composed of one radiation feeder, and the isolated topology island path is composed of one isolated topology island.
Further, the analyzing of the trunk parts and the calculating of the trunk lengths for the four types of the paths respectively include
(1) Performing topology analysis based on the current grid, adding all topology points into a queue to be searched, judging whether the search queue is empty, if so, finishing outputting the result, and if not, entering (2);
(2) taking out a topological point from the queue, judging that the topological point is marked as searched, if so, circularly entering (1), otherwise, entering (3);
(3) judging whether the topological point has a feeder line, if so, entering (6), and if not, entering (4);
(4) the topological points belong to an isolated topological island path, searching the topological island, finding two topological points with the farthest distance, taking the path between the two topological points as a main path, and entering the step (5);
(5) and creating an alternative path according to the nodes, the equipment and the main path in the topological range, and adding an alternative path array.
(6) Judging whether the topological point has a contact feeder line, if so, entering (6), and if not, entering (8);
(7) the topological point belongs to a radiation line path, a longest path is searched out by taking a feeder line outlet switch as a starting point, and the longest path is taken as a main path and enters the step (5);
(8) traversing the contact feeder line, judging whether the contact feeder line of the transformer substation is different from the current feeder line, if so, entering (11), and if not, entering (9);
(9) the current feeder line and each contact feeder line can form a co-station alternative path, the trunk length of the alternative path formed by the current feeder line and each contact feeder line is calculated, and the trunk length enters (10);
(10) taking the feeder line combination with the longest trunk path to create an alternative path, and adding the alternative path array;
(11) and (3) preferentially taking the different station feeder lines to form an inter-station path, forming an inter-station alternative path by the current feeder line and each contact feeder line, calculating the trunk length of the alternative path formed by the current feeder line and each different station contact feeder line, and entering (10).
Further, the third step comprises
(1) Adding all the alternative paths into an ascending queue, judging whether the ascending queue is empty, if so, finishing outputting the result, and if not, entering (2);
(2) taking out a path P at the head of the queue in the ascending queue, starting traversing the power supply unit, judging whether the power supply unit is completely traversed, if so, entering (5), and if not, entering (3);
(3) taking the power supply unit U traversed currently, finding the nearest node on each power supply unit U for all points on the path P, such as AA ', BB ', CC ' and CD ', taking the nearest point as the node on the power supply unit U to establish mapping AA ', BB ' and CC ', taking the longest mapped length Len of the power supply unit as AB + BC, judging whether the mapping length is less than 1KM, if so, circularly entering into (2), and if not, entering into (4);
(4) calculating the mapped construction Cost1 ═ AA '+ CC', and calculating the Cost of branch access: calculating the average distance Cost 2-ave from the power supply unit U to the path mapping part, calculating the mapping Benefit Benefit of the power supply unit U by using the path P Len-Cost1-Cost2, recording the unit with the maximum mapping Benefit and greater than 0 as Optimal U, and circularly entering the step (2);
(5) taking a unit Optimal U to utilize a path P, and marking a mapping part in the unit Optimal U as used; and (4) cutting off the mapped part in the P, generating a new path object based on the deleted path, adding the new path object into the sorting queue, and circularly entering (1).
Further, the paths in the ascending queue are arranged in order of the trunk length from small to large.
Compared with the prior art, the invention has the following beneficial effects:
according to the invention, through the normalized utilization of the current power grid, the optimal cost for the power supply unit access of the distant view grid frame is fully considered, so that the current power grid is utilized once, and the waste of repeated utilization is avoided. By establishing formulas such as mapping length, mapping construction cost and mapping benefit of the power supply unit, the cost of the load of the power supply unit when the load of the power supply unit is connected to the existing power grid can be calculated quantitatively, so that comparison and selection can be performed among different access schemes, and finally the access scheme which utilizes the existing power grid and has the best economical efficiency is generated.
The invention saves a large amount of investment of the power distribution network, can effectively avoid a large amount of resource waste in the construction process of the power distribution network, and has remarkable effect.
Drawings
Fig. 1 is a schematic flow chart of a method for normalizing utilization of a power distribution network in a current network frame.
Fig. 2 is a schematic flow chart of a second step in the method for normalizing and utilizing the power distribution network in the current grid.
Fig. 3 is a schematic flow chart of a third step in the method for normalizing and utilizing the power distribution network in the current grid.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
As shown in fig. 1 to fig. 3, the method for normalizing and utilizing the power distribution network in the current grid according to the present invention includes the following steps:
step one, modeling is carried out on power distribution network equipment, a land parcel, a power supply partition and a power supply unit.
Analyzing the topology of the current power grid, dividing the alternative path into four types, namely an inter-station path (which consists of two contact feeders and different transformer substations to which the two feeders belong), a co-station path (which consists of two contact feeders and same transformer substations to which the two feeders belong), a radiation line path (which consists of one radiation feeder), and an isolated topological island path (which consists of an isolated topological island), and analyzing a trunk part and calculating the trunk length of the four types of paths respectively;
comprises the following steps
(1) Performing topology analysis based on the current grid, adding all topology points into a queue to be searched, judging whether the search queue is empty, if so, finishing outputting the result, and if not, entering (2);
(2) taking out a topological point from the queue, judging that the topological point is marked as searched, if so, circularly entering (1), otherwise, entering (3);
(3) judging whether the topological point has a feeder line, if so, entering (6), and if not, entering (4);
(4) the topological points belong to an isolated topological island path, searching the topological island, finding two topological points with the farthest distance, taking the path between the two topological points as a main path, and entering the step (5);
(5) and creating an alternative path according to the nodes, the equipment and the main path in the topological range, and adding an alternative path array.
(6) Judging whether the topological point has a contact feeder line, if so, entering (6), and if not, entering (8);
(7) the topological point belongs to a radiation line path, a longest path is searched out by taking a feeder line outlet switch as a starting point, and the longest path is taken as a main path and enters the step (5);
(8) traversing the contact feeder line, judging whether the contact feeder line of the transformer substation is different from the current feeder line, if so, entering (11), and if not, entering (9);
(9) the current feeder line and each contact feeder line can form a co-station alternative path, the trunk length of the alternative path formed by the current feeder line and each contact feeder line is calculated, and the trunk length enters (10);
(10) taking the longest feeder combination of the trunk paths to create an alternative path, and adding the alternative path into an alternative path array;
(11) and (3) preferentially taking the different station feeder lines to form an inter-station path, wherein the current feeder line and each contact feeder line can form an inter-station alternative path, and calculating the trunk length of the alternative path formed by the current feeder line and each different station contact feeder line (taking a path between two feeder line outgoing switches as a trunk path) and entering (10).
Step three, calculating the mapping benefit of the power supply unit when the power supply unit utilizes the alternative path through the generated mapping between the power supply unit and the alternative path, and taking the optimal benefit as the corresponding relation of the power supply unit utilizing the current power grid;
comprises the following steps
(1) Adding all the alternative paths into an ascending queue (arranged according to the sequence of the trunk length from small to large), judging whether the ascending queue is empty, if so, finishing outputting the result, and if not, entering (2);
(2) taking out a path P at the head of the queue in the ascending queue, starting traversing the power supply unit, judging whether the power supply unit is completely traversed, if so, entering (5), and if not, entering (3);
(3) taking the power supply unit U traversed currently, finding the nearest node on each power supply unit U for all points on the path P, such as AA ', BB ', CC ' and CD ', taking the nearest point as the node on the power supply unit U to establish mapping AA ', BB ' and CC ', taking the longest mapped length Len of the power supply unit as AB + BC, judging whether the mapping length is less than 1KM, if so, circularly entering into (2), and if not, entering into (4);
(4) calculating the mapped construction Cost1 ═ AA '+ CC', and calculating the Cost of branch access: calculating the average distance Cost2 ═ ave from the power supply unit U to the path mapping part (the average distance needs to calculate the nearest distance from all nodes on the mapped part A 'C' of the path to U, and taking an average value), calculating the mapping Benefit Benefit ═ Len-Cost1-Cost2 of the power supply unit U by using the path P, recording the unit with the maximum mapping Benefit and greater than 0 as Optimal U, and circularly entering (2);
(5) taking a unit Optimal U to utilize a path P, and marking a mapping part in the unit Optimal U as used; and (4) cutting off the mapped part in the P, generating a new path object based on the deleted path, adding the new path object into the sorting queue, and circularly entering (1).
And step four, taking the scheme with the best economy obtained after analyzing all the power supply units and the current power grid as a final scheme utilized in the perspective grid.
In summary, the normalized utilization method of the power distribution network in the current grid structure fully considers the optimal cost of the power supply unit access of the distant view grid structure for the normalized utilization of the current grid structure, thereby realizing the one-time utilization of the current grid structure and avoiding the waste of recycling. By establishing formulas such as mapping length, mapping construction cost and mapping benefit of the power supply unit, the cost of the load of the power supply unit when the load of the power supply unit is connected to the existing power grid can be calculated quantitatively, so that comparison and selection can be performed among different access schemes, and finally the access scheme which utilizes the existing power grid and has the best economical efficiency is generated.
It will be evident to those skilled in the art that the invention is not limited to the details of the foregoing illustrative embodiments, and that the present invention may be embodied in other specific forms without departing from the spirit or essential attributes thereof. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.
Claims (5)
1. A method for utilizing a power distribution network in a current network frame in a normalized mode is characterized by comprising the following steps: the method comprises the following steps:
step one, modeling power distribution network equipment, a land parcel, a power supply partition and a power supply unit;
analyzing the topology of the current power grid, dividing the alternative paths into four types, namely an inter-station path, a co-station path, a radiation path and an isolated topology island path, analyzing a trunk part of the four types of paths respectively and calculating the length of the trunk;
step three, calculating the mapping benefit of the power supply unit when the power supply unit utilizes the alternative path through the generated mapping between the power supply unit and the alternative path, and taking the optimal benefit as the corresponding relation of the power supply unit utilizing the current power grid;
and step four, taking the scheme with the best economy obtained after analyzing all the power supply units and the current power grid as a final scheme utilized in the perspective grid.
2. The method for normalizing and utilizing the power distribution network in the current grid structure according to claim 1, wherein the method comprises the following steps: in the second step, the inter-station access is composed of two contact feeders, the substations to which the two feeders belong are different, the co-station access is composed of two contact feeders, the substations to which the two feeders belong are the same, the radiation line access is a co-station access composed of one radiation feeder, and the isolated topological island access is composed of an isolated topological island.
3. The method for normalizing and utilizing the power distribution network in the current grid structure according to claim 2, wherein the method comprises the following steps: analyzing the four types of paths to obtain the trunk part and calculating the trunk length, wherein the method comprises the following specific steps
(1) Performing topology analysis based on the current grid, adding all topology points into a queue to be searched, judging whether the search queue is empty, if so, finishing outputting the result, and if not, entering (2);
(2) taking out a topological point from the queue, judging that the topological point is marked as searched, if so, circularly entering (1), otherwise, entering (3);
(3) judging whether the topological point has a feeder line, if so, entering (6), and if not, entering (4);
(4) the topological points belong to an isolated topological island path, searching the topological island, finding two topological points with the farthest distance, taking the path between the two topological points as a main path, and entering the step (5);
(5) creating an alternative path according to the nodes, the equipment and the main path in the topological range, and adding an alternative path array;
(6) judging whether the topological point has a contact feeder line, if so, entering (6), and if not, entering (8);
(7) the topological point belongs to a radiation line path, a longest path is searched out by taking a feeder line outlet switch as a starting point, and the longest path is taken as a main path and enters the step (5);
(8) traversing the contact feeder line, judging whether the contact feeder line of the transformer substation is different from the current feeder line, if so, entering (11), and if not, entering (9);
(9) the current feeder line and each contact feeder line can form a co-station alternative path, the trunk length of the alternative path formed by the current feeder line and each contact feeder line is calculated, and the trunk length enters the step (10);
(10) taking the longest feeder combination of the trunk paths to create an alternative path, and adding the alternative path into an alternative path array;
(11) and (3) preferentially taking the different station feeder lines to form an inter-station path, forming an inter-station alternative path by the current feeder line and each contact feeder line, calculating the trunk length of the alternative path formed by the current feeder line and each different station contact feeder line, and entering (10).
4. The method for normalizing and utilizing the power distribution network in the current grid structure according to claim 1, wherein the method comprises the following steps: the third step comprises
(1) Adding all the alternative paths into an ascending queue, judging whether the ascending queue is empty, if so, finishing outputting the result, and if not, entering (2);
(2) taking out a path P at the head of the queue in the ascending queue, starting traversing the power supply unit, judging whether the power supply unit is completely traversed, if so, entering (5), and if not, entering (3);
(3) taking the power supply unit U traversed currently, finding the nearest node on each power supply unit U for all points on the path P, such as AA ', BB ', CC ' and CD ', taking the nearest point as the node on the power supply unit U to establish mapping AA ', BB ' and CC ', taking the longest mapped length Len of the power supply unit as AB + BC, judging whether the mapping length is less than 1KM, if so, circularly entering into (2), and if not, entering into (4);
(4) calculating the mapped construction Cost1 ═ AA '+ CC', and calculating the Cost of branch access: calculating the average distance Cost 2-ave from the power supply unit U to the path mapping part, calculating the mapping Benefit Benefit of the power supply unit U by using the path P Len-Cost1-Cost2, recording the unit with the maximum mapping Benefit and greater than 0 as Optimal U, and circularly entering the step (2);
(5) taking a unit Optimal U to utilize a path P, and marking a mapping part in the unit Optimal U as used; and (4) cutting off the mapped part in the P, generating a new path object based on the deleted path, adding the new path object into the sorting queue, and circularly entering (1).
5. The method for normalizing the power distribution network in the current grid structure according to claim 4, wherein the method comprises the following steps: the paths in the ascending queue are arranged in order of the length of the trunk from small to large.
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