CN111222209A - Optimized generation method of low-voltage distribution network three-phase circuit split-phase single line diagram - Google Patents
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Abstract
The invention discloses an optimized generation method of a three-phase circuit split-phase single line diagram of a low-voltage distribution network. The situation perception of the medium-high voltage distribution network based on intelligent measurement is relatively fully researched; however, the situation visualization of the low-voltage distribution network by using the smart meter as a situation perception source is hardly researched. The method carries out optimization calculation of the single line diagram based on a given certain single line diagram initial diagram on the basis of the topology and the line electrical parameters of the low-voltage distribution network in the known transformer area. According to the topological relation and the load nodes of the single feeder of the low-voltage three-phase power distribution network, the method can automatically generate the uniformly distributed and optimized single line diagram, thereby being beneficial to performing situation rendering on the single line diagram at the later stage and performing picture-based situation analysis and situation mining on the situation diagram.
Description
Technical Field
The invention belongs to the field of situation perception and visualization of smart power grids, and particularly relates to an optimal generation method of a three-phase circuit split-phase single line diagram of a low-voltage power distribution network.
Background
The low-voltage power distribution network of the public transformer area is the bottommost layer power grid which is served by a power grid company for a large number of low-voltage power users; the electricity users can be divided into three-phase users and single-phase users; the low-voltage distribution network takes a distribution transformer as a power supply, takes a three-phase four-wire as a main power supply mode and also takes a single-phase double-wire power supply mode into consideration; the main trunk line is laid by three-phase four-wire, and the middle of the main trunk line is provided with a junction box or a junction box for leading out three-phase four-wire branches, or leading out the service wire of a three-phase four-wire user, or leading out a neutral wire or a certain phase wire to form a single-phase two-wire branch, or leading out the service wire of a single-phase user.
The low-voltage distribution network has three-phase unbalance of topology due to the existence of single-phase double-line branches and user service lines; due to the fact that single-phase electricity of single-phase users is used, a large number of single-phase double-line loads exist in three-phase user rooms, and a large number of single-phase photovoltaic devices are installed in a large number of users, the low-voltage distribution network can be in a serious three-phase unbalanced operation state during operation, and therefore the problems that voltage is out of limit, loss is increased and the like are caused.
Therefore, situation rendering of electrical parameter values such as node voltage, branch current and the like based on the measurement data of the intelligent electric meter and load flow calculation is performed on the basis of the automatically generated single line diagram of the low-voltage distribution network, so that an excellent situation graph is formed.
The single line diagram is automatically generated by a main rule method, an optimized mathematical model method, a force field model or a dynamic algorithm; the rule method is quick in calculation, can avoid the overlapping problem, and has the main defect that space is likely to be whitish, so that space waste is caused; the method for establishing the optimized mathematical model of the single line diagram by using the optimized mathematical model method is very simple, but the optimized mathematical model is a high-dimensional optimized mathematical problem and is difficult to solve; the single line diagram calculated based on the force field model or the dynamic algorithm is more optimized and fast in calculation, but cross and layout ball clustering may occur.
The situation perception of the medium-high voltage distribution network based on intelligent measurement is relatively fully researched; however, the situation visualization of the low-voltage distribution network by using the smart meter as a situation perception source is hardly researched.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects in the prior art and provide an optimized generation method of a three-phase circuit split-phase single line diagram of a low-voltage distribution network, so as to be beneficial to performing situation rendering on the single line diagram in the later period.
Therefore, the invention adopts the following technical scheme: an optimized generation method of a three-phase circuit split-phase single line diagram of a low-voltage distribution network is characterized in that on the basis of topology and line electrical parameters of a known transformer area low-voltage distribution network, optimized calculation of the single line diagram is carried out on the basis of a given initial diagram of a certain three-phase circuit split-phase single line diagram;
the optimization generation method comprises the following steps:
step 1), initial layout parameters comprise coordinates of line nodes and load nodes of a central low-voltage distribution network and connecting lines among the line nodes and between the line nodes and the load nodes;
step 2), inputting coefficient combinations of all acting forces, including a repulsive force coefficient kr,1、kr,2、kr,3Coefficient of attraction kaIdeal length L, center of gravity coefficient kg；
Step 3), calculating the repulsive force of a simple force guidance algorithm: a) when the actual distance between the nodes is greater than the ideal length, the size of the attractive force is influenced by the difference between the actual distance between the nodes and the ideal length and is in a direct proportion relation; b) repulsion action exists between any nodes, and the size of the repulsion is in inverse proportion to the distance between the nodes:
step 4), calculating point edge, edge repulsive force and total repulsive force;
step 5), adding gravity force to pull the nodes to make the topology converge on the graph gravity (0, 0);
step 6), calculating the improved node motion equation;
step 7), judging whether the current intersection is 0, if so, finishing the calculation, and outputting an optimal single line diagram and optimal acting force parameters; otherwise, repeating the steps 3) to 7).
The invention provides a concept of a distribution Transformer as a central low-voltage distribution Network (TCDN), and optimization calculation of a single line diagram is carried out based on a given certain single line diagram initial diagram on the basis of known topology and line electrical parameters of a distribution area low-voltage distribution Network.
Further, in step 3), the gravity is calculated as follows:
wherein f isa(Vi,Vj) In order to be the attractive force,
is node ViAnd VjDistance between, kaFor the gravitational coefficient, L is the ideal length of the leg.
Further, in b) of step 3), the repulsive force is calculated as follows:
in the formula: f. ofr(Vi) M is the total number of nodes of the single line diagram as repulsive force; k is a radical ofrFor other nodes to point ViThe weight of the repulsive force of (a),
is node ViAnd VjThe distance between them.
Further, the formula of the calculated repulsive force in step 4) is as follows:
in the formula: m is1The number of nodes is not the number of the nodes of the feeder line; n is1And q is the number of nodes on the branch of the previous level of the current node of the feeder line and the number of the remaining nodes respectively; k is a radical ofr,1For node-to-node V on other feedersiWeight of repulsive force, kr,2Is a point ViWeight of repulsion, k, of node on leg of the previous level to noder,3Point to point V for the rest nodesiThe weight of the repulsive force of (a),
is node ViAnd VjThe distance between them.
Further, in step 5), any node (n)x,ny) AddingThe gravity center gravity of (A) is as follows:
wherein the content of the first and second substances,
the distance from the node to the center of gravity;
is gravity coefficient; k is a radical ofgIs a multiple of the gravity coefficient.
Further, in step 6), each node on the single line diagram is subjected to four forces, and then the improved motion equation of the node is as follows:
in the formula: k is a node PiThe number of iterations of (a);
is a node PiProjection of the induced and repelled force, the attraction force and the repulsion force on the x axis or the y axis; dkIs a node of k stepsPiDistance from the center point, gfIs the gravity coefficient.
The invention has the following beneficial effects: based on a given certain single line diagram initial graph, according to the topological relation and the load nodes of the single feeder of the low-voltage three-phase power distribution network, the method provided by the invention can be used for automatically generating the uniformly-distributed and optimized single line diagram, thereby being beneficial to performing situation rendering on the single line diagram at the later stage and performing picture-based situation analysis and situation mining on the situation diagram.
Drawings
FIG. 1 is a phase-splitting initial single-line diagram of a three-phase circuit of a low-voltage distribution network in a platform A area automatically generated by a certain method in the prior art;
fig. 2 is a single line diagram of the optimized low-voltage distribution network based on fig. 1.
Detailed Description
The invention is further described with reference to the drawings and the detailed description.
Examples
The embodiment provides an optimized generation method of a three-phase circuit split-phase single line diagram of a low-voltage distribution network, which comprises the following steps:
step 1, initial layout parameters comprise coordinates of line nodes and load nodes of the TCDN, and connecting lines among the line nodes and between the line nodes and the load nodes.
Step 2, inputting coefficient combination of each acting force, including repulsive force coefficient kr,1、kr,2、kr,3Coefficient of attraction kaIdeal length L, center of gravity coefficient kg。
And 3, calculating the repulsive force of a simple force guidance algorithm: (1) when the actual distance between the nodes is greater than the ideal length, the size of the attractive force is influenced by the difference between the actual distance between the nodes and the ideal length and is in a direct proportion relation; (2) the repulsion function exists between any nodes, and the magnitude of the repulsion is in inverse proportion to the distance between the nodes.
(1) Calculating the gravitation:
wherein the content of the first and second substances,
is node ViAnd VjDistance between, kaFor the gravitational coefficient, L is the ideal length of the leg.
(2) Calculation of repulsion force
In the formula: m is the total number of nodes of the single line graph; k is a radical ofrFor other nodes to point ViThe repulsive force weight of (1).
And 4, calculating the point edge, the edge repulsive force and the total repulsive force. The formula of the calculated repulsion force is as follows:
in the formula: m is1The number of nodes is not the number of the nodes of the feeder line; n is1And q is the number of nodes on the branch of the previous level of the current node of the feeder line and the number of the remaining nodes respectively; k is a radical ofr,1For node-to-node V on other feedersiWeight of repulsive force, kr,2Is a point ViWeight of repulsion, k, of node on leg of the previous level to noder,3Point to point V for the rest nodesiThe repulsive force weight of (1).
And 5, adding gravity to pull the nodes to enable the topology to be converged at the center of gravity (0,0) of the graph.
Arbitrary node (n)x,ny) The gravity of the added gravity is as follows:
wherein the content of the first and second substances,
the distance from the node to the center of gravity;
is gravity coefficient; k is a radical ofgIs a multiple of the gravity coefficient.
And 6, calculating the improved node motion equation. Each node on the single line diagram is subjected to four forces, and then the improved motion equation of the node is as follows:
in the formula: k is a node PiThe number of iterations of (a);
is a node PiThe projection of the repulsion force on the x axis or the y axis; dkIs k steps of node PiDistance from the center point, gfIs the gravity coefficient.
Step 7, judging whether the current intersection is 0 or not, if so, finishing the calculation, and outputting an optimal single line diagram and optimal acting force parameters; otherwise, repeating the steps 3 to 7.
Fig. 1 is treated by the method of the invention, see fig. 2.
Application example
The method provided by the invention is based on force guidance, so that a conventional improved force guidance algorithm is provided firstly; then, the creativity of the present invention was verified by application example calculation analysis.
In the application example, a machine is a ThinkVision P900 workstation, a 6-core CPU and a 4GB memory are configured, a single line diagram is formed by 1 TCDN in a certain area, and the A-platform area is used for analysis of the application example.
Firstly, inputting coordinates of a line node and a load node of a three-phase circuit split-phase initial single line diagram and a connection relation between the line and the line node or the load node.
Then, coefficient combination of each acting force is given;
and finally, obtaining the optimized single-line diagram of the three-phase ABC through iterative calculation of formulas (5) to (9) in the embodiment.
The number of the single line diagram cross points is 0, the single line diagram cross points are uniformly distributed, the optimization requirement is met, the single line diagram is a TCDN (transmission delay line distribution) wiring height identification single line diagram considering situation awareness, situation rendering is favorably carried out on the single line diagram at the later stage, and picture-based situation analysis and situation mining are carried out on the situation diagram.
The foregoing embodiments have described some of the details of the present invention, but are not to be construed as limiting the invention, and those skilled in the art may make variations, modifications, substitutions and alterations herein without departing from the principles and spirit of the invention.
Claims (6)
1. An optimized generation method of a three-phase circuit split-phase single line diagram of a low-voltage distribution network is characterized in that optimization calculation of a single line diagram is carried out on the basis of a given initial diagram of a certain three-phase circuit split-phase single line diagram on the basis of the topology and the circuit electrical parameters of the low-voltage distribution network in a known distribution area;
the optimization generation method comprises the following steps:
step 1), initial layout parameters comprise coordinates of line nodes and load nodes of a central low-voltage distribution network and connecting lines among the line nodes and between the line nodes and the load nodes;
step 2), inputting coefficient combinations of all acting forces, including a repulsive force coefficient kr,1、kr,2、kr,3Coefficient of attraction kaIdeal length L, center of gravity coefficient kg；
Step 3), calculating the repulsive force of a simple force guidance algorithm: a) when the actual distance between the nodes is greater than the ideal length, the size of the attractive force is influenced by the difference between the actual distance between the nodes and the ideal length and is in a direct proportion relation; b) repulsion action exists between any nodes, and the size of the repulsion is in inverse proportion to the distance between the nodes:
step 4), calculating point edge, edge repulsive force and total repulsive force;
step 5), adding gravity force to pull the nodes to make the topology converge on the graph gravity (0, 0);
step 6), calculating the improved node motion equation;
step 7), judging whether the current intersection is 0, if so, finishing the calculation, and outputting an optimal single line diagram and optimal acting force parameters; otherwise, repeating the steps 3) to 7).
2. The method for optimally generating the three-phase circuit split-phase single line diagram of the low-voltage distribution network according to claim 1, wherein in the step 3), the gravity is calculated as follows:
wherein f isa(Vi,Vj) In order to be the attractive force,
is node ViAnd VjDistance between, kaFor the gravitational coefficient, L is the ideal length of the leg.
3. The method for optimally generating the three-phase circuit split-phase single line diagram of the low-voltage distribution network according to claim 1, wherein in the step b) of the step 3), the repulsive force is calculated as follows:
in the formula: f. ofr(Vi) M is the total number of nodes of the single line diagram as repulsive force; k is a radical ofrFor other nodes to point ViThe weight of the repulsive force of (a),
is node ViAnd VjThe distance between them.
4. The method for optimally generating the three-phase circuit split-phase single line diagram of the low-voltage distribution network according to claim 1, wherein the formula of the calculated repulsive force in the step 4) is as follows:
in the formula: m is1The number of nodes is not the number of the nodes of the feeder line; n is1And q is the number of nodes on the branch of the previous level of the current node of the feeder line and the number of the remaining nodes respectively; k is a radical ofr,1For node-to-node V on other feedersiWeight of repulsive force, kr,2Is a point ViWeight of repulsion, k, of node on leg of the previous level to noder,3Point to point V for the rest nodesiThe weight of the repulsive force of (a),
is node ViAnd VjThe distance between them.
5. The method for optimally generating the split-phase single line diagram of the three-phase circuit of the low-voltage distribution network according to claim 1, wherein in the step 5), any node (n) is selectedx,ny) The gravity of the added gravity is as follows:
wherein the content of the first and second substances,
the distance from the node to the center of gravity;
is gravity coefficient; k is a radical ofgIs a multiple of the gravity coefficient.
6. The method for optimally generating the three-phase circuit split-phase single line diagram of the low-voltage distribution network according to claim 5, wherein in the step 6), each node on the single line diagram is subjected to four forces, and then the improved node motion equation is as follows:
in the formula: k is a node PiThe number of iterations of (a);
is a node PiProjection of the induced and repelled force, the attraction force and the repulsion force on the x axis or the y axis; dkIs k steps of node PiDistance from the center point, gfIs the gravity coefficient.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN113486485A (en) * | 2021-07-19 | 2021-10-08 | 许昌许继软件技术有限公司 | Single line diagram automatic mapping layout optimization method and device based on geographical edge layout |
| CN114152789A (en) * | 2020-09-08 | 2022-03-08 | 武汉国测数据技术有限公司 | Three-meter method three-phase electric energy meter structure for user self-checking error and checking method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109858056A (en) * | 2017-11-30 | 2019-06-07 | 云南电网有限责任公司瑞丽供电局 | A kind of automatic generation method of power distribution single-line diagram, system and automatic amending method |
| CN109885859A (en) * | 2018-12-28 | 2019-06-14 | 杭州电子科技大学 | The substation for adding inertia force is center network distribution single line diagram autoplacement calculation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109858056A (en) * | 2017-11-30 | 2019-06-07 | 云南电网有限责任公司瑞丽供电局 | A kind of automatic generation method of power distribution single-line diagram, system and automatic amending method |
| CN109885859A (en) * | 2018-12-28 | 2019-06-14 | 杭州电子科技大学 | The substation for adding inertia force is center network distribution single line diagram autoplacement calculation method |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114152789A (en) * | 2020-09-08 | 2022-03-08 | 武汉国测数据技术有限公司 | Three-meter method three-phase electric energy meter structure for user self-checking error and checking method |
| CN114152789B (en) * | 2020-09-08 | 2024-04-02 | 武汉国测数据技术有限公司 | Three-meter-method three-phase electric energy meter structure with user self-checking error and checking method |
| CN113486485A (en) * | 2021-07-19 | 2021-10-08 | 许昌许继软件技术有限公司 | Single line diagram automatic mapping layout optimization method and device based on geographical edge layout |
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