CN107945245B - Automatic generation method of regional graph of power distribution network - Google Patents
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Abstract
The invention relates to a method for automatically generating a regional graph of a power distribution network, which comprises the following steps: (1) extracting all connection relations of the transformer substation, and storing the connection relations in a channel form; (2) dividing the channel into a loop channel, a single-pair single channel and a multi-connection relationship channel; (3) carrying out local layout on the station rooms in the multi-connection relation channel; addressing and placing station rooms and equipment in a loop back channel and a single pair of single channels; (4) and drawing connecting lines according to the connection relation of the whole graph, and adding a switch device. The method can realize automatic generation of the distribution network graph, reduce the graph generation period, solve the problems of long time consumption, easy error, irregular graph and non-uniform display effect of manual drawing of the distribution network area graph, provide convenience for distribution network engineering personnel in the process of system construction, graph maintenance and upgrading, greatly improve the graph generation efficiency and accuracy and also enhance the easy maintenance of the distribution network area network graph.
Description
Technical Field
The invention relates to a method for automatically generating a regional graph of a power distribution network, and belongs to the technical field of power system distribution network automation.
Background
With the gradual expansion of modern city scale and the development of city digitalization and informatization, the demand for electric energy is gradually increased, and the demand for the quality and reliability of a power distribution network is improved. The distribution network area graph is used for showing the actual topological connection relation of the distribution network in a certain area, and is also graph data showing the real-time running state and real-time fault positioning of the distribution network. Because the regional graph of the power distribution network is relatively complex, the generation mode of the traditional power distribution network graph is mostly drawn manually by combining a power distribution network engineering graph according to a geographic information graph, and the method has the defects of long drawing period, high possibility of error, irregular graph and the like. Meanwhile, manual drawing also brings great difficulty to later graph maintenance and graph modification after line reconstruction and upgrade. Therefore, the automatic generation technology of the power distribution network graph which is easy to operate and maintain is urgent.
Disclosure of Invention
The invention aims to provide an automatic generation method of a distribution network area graph, which is used for solving the problem that the manual drawing mode of the distribution network graph is easy to make mistakes.
In order to achieve the above object, the present invention provides a method for automatically generating a power distribution network area graph, including the following steps:
(1) extracting all connection relations of the transformer substation, sequentially analyzing the connection relations among the transformer substations and station rooms and equipment in the connection relations, and storing the connection relations and the station rooms and the equipment in a channel form;
(2) dividing the channel into a loop channel, a single-pair single channel and a multi-connection relationship channel;
(3) carrying out local layout on the station rooms in the multi-connection relation channel; addressing and placing station rooms and equipment in a loop back channel and a single pair of single channels;
(4) and drawing connecting lines according to the connection relation of the whole graph, and adding a switch device.
Firstly, the connection between the transformer stations is stored in a channel mode through analysis of the connection relationship, then the connection relationship is classified and refined in the form of the channel and divided into a loop channel, a single-pair single channel and a multi-connection relationship channel, and then different image forming mode processing is carried out on the connection relationship blocks with different complexities, specifically: the station rooms in the multiple-connection-relation channels are locally distributed, and the station rooms and equipment in the loop channel and the single-pair single channel are addressed and placed; and finally, drawing a connecting line according to the connection relation of the whole graph, and adding a switch device. The method can realize automatic generation of the distribution network graph, reduce the graph generation period, solve the problems of long time consumption, easy error, irregular graph and non-uniform display effect of manual drawing of the distribution network area graph, provide convenience for distribution network engineering personnel in the process of system construction, graph maintenance and upgrading, greatly improve the graph generation efficiency and accuracy and also enhance the easy maintenance of the distribution network area network graph.
The process of realizing the local layout comprises the following steps:
1) performing initial layout according to the local connection relation;
2) the local connection relation is laid out by utilizing a guiding algorithm;
3) gridding the local connection relation which is distributed by using a guiding algorithm;
4) performing orthogonalization processing on the local connection relation after layout;
5) and compressing the local connection relation layout by using a window mode.
When local layout is carried out on the station rooms corresponding to the channels with the multiple connection relations, the transformer substation is initially laid out according to the outgoing line number of the transformer substation and the equipment number among the channels, then the position where the equipment should be placed is calculated for the equipment in the channels among the multiple transformer substations according to a force guiding formula after key equipment points are determined, and then the part of area is placed at the reasonable position of the initial layout of the transformer substation after the steps of meshing, orthogonalizing and compressing are carried out. And finally, the one-to-one channels among the transformer stations are distributed to complete the overall layout of the region graph. The overall layout of the area graph is completed by combining the layout of the station rooms and the equipment in the loop channel and the single-pair single channel, so that the efficiency and the accuracy of automatic generation of the power distribution network graph can be further improved.
The guiding algorithm is an algorithm for determining the vector distance of the equipment which needs to move in the operation by calculating the resultant force and the direction of each equipment moving at the point according to the local connection relation until all the equipment is not crossed and misaligned, the resultant force consists of the pulling force and the pushing force applied to the point, and the calculation formula of the guiding algorithm is as follows:
wherein, L is a natural length set according to the number of points in the Power distribution network data and a required graph density, Dis is a distance between a point to be calculated and another arbitrary point, Tension is a tensile force, replay is a thrust force, Power is the number of devices passing from a point V1 to a point V2, k is a set coefficient, Mass (V1) is the number of devices directly connected to a point V1, Mass (V2) is the number of devices directly connected to a point V2, and Fr is a set empirical coefficient.
The gridding process comprises the following steps: the whole area is reduced to the area occupied by the equipment and the station rooms, the grids are determined according to the picture proportion, and all the station rooms and the equipment are placed in the grids with the nearest distance.
The orthogonal processing process comprises the following steps: and judging whether the equipment is on the same horizontal or vertical line according to the angle of the relative position of the equipment and the station room, and if not, placing the equipment on the same horizontal or vertical line according to the principle that the relative angle moves by the minimum distance.
The window is the maximum grid distance occupied by the devices with connection relations in the grid rows or columns, in the compression process, each row or each column of grids is scanned firstly, if the row or the column has the devices placed, whether the devices have the connection relations is checked, the grid occupied by the devices with connection relations in each row or the column and the maximum grid distance from any device to another device are fixed as the current window, if no device exists in the grid area of the next row or the column of the window, the window is compressed to the next row or the column, otherwise, the window is continuously scanned downwards without fixation, if the next row or the column has the device and the length of the window formed by the devices is larger than that of the current window, the window of the next row is fixed as the current window and is continuously checked downwards until the boundary is reached.
The single-pair single channel is the condition that the channel is only connected with two different transformer substations, and the placing process of the equipment in the single-pair single channel is as follows: the method comprises the steps of firstly analyzing the positions of two substations in a channel to determine the position of terminal equipment, then addressing according to the position of the terminal equipment and the wiring direction to find a grid area where other equipment can be placed, and finally placing the equipment in the grid area to finish single-pair single-channel processing.
If the channel is only connected with two substations which are the same substation, the channel is a loop channel, and the placing process of the equipment in the loop channel is as follows: after the placement positions of the terminal devices are determined, the devices are sequentially placed along the placement direction of the terminal devices.
The switch device is added in a mode that the switch device is added in the space of the boundary of the station room and the grid where the equipment is located, wherein the station room and the equipment belong to or are in connection relation.
Drawings
FIG. 1 is a flow diagram of one embodiment of a method for automatically generating a graph of a power distribution network area;
FIG. 2 is a schematic diagram of a format of a connection relationship configuration file;
fig. 3 is a schematic diagram of model decoupling.
Detailed Description
A method for automatically generating a power distribution network area graph comprises the following steps:
(1) extracting all connection relations of the transformer substation, sequentially analyzing the connection relations among the transformer substations and station rooms and equipment in the connection relations, and storing the connection relations and the station rooms and the equipment in a channel form;
(2) dividing the channel into a loop channel, a single-pair single channel and a multi-connection relationship channel;
(3) carrying out local layout on the station rooms in the multi-connection relation channel; addressing and placing station rooms and equipment in a loop back channel and a single pair of single channels;
(4) and drawing connecting lines according to the connection relation of the whole graph, and adding a switch device.
Based on the basic idea of the method, the implementation steps of the method are further described in detail with reference to fig. 1 to 3.
Fig. 1 is a schematic flow chart of an automatic generation method of a whole distribution network area graph.
(1) All connection relations of the transformer substations are searched, and then the connection relations among the transformer substations and station rooms and equipment in the connection relations are sequentially analyzed and stored in a Channel (Channel) form. After the connection relationships are searched, the connection relationships can be configured according to a certain file format, then, a standard file format is defined, which is called a connection relationship configuration file, and the connection relationships are configured based on the configuration file, as shown in fig. 2, in the connection relationship configuration file, [ ] represents a substation element, () represents a switch element, and { } represents a station room type element.
A corridor is a reachable path from a substation to any other substation. In the process of channel analysis, if a branch situation occurs in a path, if two or more branches and a main line finally reach the same substation, the main line and each branch belong to the same channel, otherwise, the branch is divided into a plurality of channels according to the branch situation. The way of marking the channel is to store the substation to which the channel belongs and the connected substation, and directly connect the station rooms and equipment (named in the form of terminal equipment) of the substation. The Channel is stored in the memory object and is a detailed expression of the type of the connection relation between the transformer substations. Thus, a channel may also be understood as a "pipe" between substations, i.e. one of the paths "flowing" from one substation to another.
(2) After all the connection relations are configured, the method can be understood as establishing a corresponding model, decoupling the model, carrying out detailed analysis on channels among transformer stations, and dividing the channels into Loop channels (Loop), Single-pair Single-channel (Single) and multi-connection relation (Multiple) channels. Wherein, the loop channel and the single pair of single channels are one-to-one channels.
The model decoupling process is to strip the model after scanning the connection relation of the model so as to achieve the purpose of processing the connection relation with different complexity by different mapping methods. As shown in fig. 3, the left dashed area 1 in the figure represents a stripped single pair of single channels, which connect and connect only two substations, and the remaining two dashed areas (areas 2 and 3) represent multiple connection relationship channels.
(3) And processing station chambers in the loop channel, the single-pair single channel and the multi-connection relationship channel, wherein the station chambers in the multi-connection relationship channel are locally distributed, and the station chambers and equipment in the loop channel and the single-pair single channel are addressed and placed.
The steps of the partial layout are as follows:
1) the initial layout is performed according to the local connection relationship, and may be performed according to a certain principle, or may be performed randomly.
2) And (5) laying out the local connection relation by using a guiding algorithm.
The guiding algorithm is an algorithm for determining the vector distance of the equipment which needs to move in the operation by calculating the resultant force and the direction of each equipment moving at the point according to the local connection relation until all the equipment is not crossed and misaligned, namely the guiding algorithm is used for calculating the resultant force of the point in each layout iteration, wherein the resultant force consists of the pulling force and the pushing force of the point, the unit of the resultant force is the distance of the point which needs to move on the X axis and the Y axis respectively, and the calculation formula of the guiding algorithm is as follows:
the number of points in the power distribution network data and the required pattern density are set, and the value range of the L is generally the same as the width of the grid; dis is the distance between the point to be calculated and any other point; tension is tensile force; repulsion is thrust; power is the number of devices passing from point V1 to point V2; k is a set coefficient, and a value range of k can be obtained according to experience and is 0.5-0.8; mass (V1) is the number of devices directly connected at the V1 point, namely the Mass of the V1 point; mass (V2) is the number of devices directly connected at the V2 point, namely the Mass of the V2 point; fr is a set empirical coefficient, and is typically in the range of 10 to the grid width.
Thus, for a tensile force Tension, when the distance Dis from any point is less than or equal to the natural length L, the tensile force is 0; if the distance Dis is greater than the natural length L, the pulling force is equal to the distance Dis minus the natural length L. For thrust replusion, if the distance Dis between two points is less than or equal to 0, the thrust is an empirical coefficient Fr; if the distance Dis is greater than 0, the thrust force is equal to the ratio of the product of the number of devices Power passed from the point V1 to the point V2, the coefficient k, the mass at the point V1 and the mass at the point V2 to the square of the distance Dis.
3) And gridding the local connection relation which is distributed by using the guiding algorithm.
The gridding process comprises the following steps: the whole area is reduced to the area occupied by the equipment and the station rooms, the grids are determined according to the picture proportion, and all the station rooms and the equipment are placed in the grids with the nearest distance.
4) And performing orthogonalization processing on the local connection relation after layout.
The orthogonal processing process comprises the following steps: and judging whether the equipment is on the same horizontal or vertical line according to the angle of the relative position of the equipment and the station room, if not, placing the equipment on the same horizontal or vertical line according to the principle that the relative angle moves the minimum distance so as to achieve the effect of preliminary orthogonality.
5) And compressing the local connection relation layout by using a Window (Window) mode.
In the local graph compression process, firstly scanning each row or each column of grids, if the row or the column has a device placed, checking whether the device has a connection relation, fixing the grids occupied by the devices with the connection relation in each row or column and the maximum grid distance from any device to another device as a current Window, if no device exists in the grid area of the next row or column of the Window, compressing the Window to the next row or column, otherwise, continuously scanning downwards without fixing, if the next row or the column has a device existing and the length of the Window formed by the devices is larger than that of the current Window, fixing the Window of the next row as the current Window and continuously checking downwards until the boundary is reached.
The method is to compress the window into a window for scanning each row by using a window mode, and then remove the window corresponding to the scanning direction next row/column.
In addition, complex connection relations may be involved in the multiple connection channels, specifically, connection relations between the station rooms and the equipment of the substation are not included in the multiple connection channels, and the local complex connection relations are obtained through analysis of the station rooms and the equipment in the multiple connection relation channels.
A single pair of single channels is the case where the channel is connected to only two different substations. The placement process of the device in a single pair of single channels is: firstly, analyzing the positions of two substations in a channel to determine the position of the terminal equipment, and determining the placement direction of the equipment in the channel after the position of the terminal equipment is determined; then addressing is carried out according to the position of the terminal equipment and the wiring direction, and a grid area where other equipment can be placed can be found; and finally, placing the equipment into the grid area to complete single-pair single-channel processing.
If the channel is only connected with two substations which are the same substation, the channel is a loop channel, namely the loop channel is the condition that the two substations which are mutually connected are the same substation, and a loop is formed. The placement of the devices in the loop channel also depends on the placement positions of the terminal devices, and after the placement positions of the terminal devices are determined, the devices are placed sequentially along the placement direction of the terminal devices. If a grid boundary is encountered, the grid may be expanded until all devices are dropped.
Therefore, when local layout is carried out on the station rooms in the channels with the multiple connection relations, the transformer substation is initially laid out according to the outgoing line number of the transformer substation and the equipment number among the channels, then the position where the equipment should be placed is calculated for the equipment in the channels among the multiple transformer substations according to the formula of guiding the application force after the key equipment point is determined, and the part of the area is placed at the reasonable position of the initial layout of the transformer substation after the steps of meshing, orthogonalizing and compressing are carried out. And then, one-to-one channels among the transformer stations are distributed to complete the overall layout of the region graph.
(4) And drawing connecting lines according to the connection relation of the whole graph, and adding a switch device.
The connecting lines are connecting lines from equipment to a station room and a substation, and the adding mode of the switch equipment is to add the switch equipment in a space at the boundary of a grid where the station room and the equipment which belong to or have a connection relation are located.
Therefore, after the connection relation of the distribution network is extracted, the connection relation is classified and refined in a channel form, and then the connection relation blocks with different complexity are processed in different imaging modes, so that the problems that the imaging period of the distribution network area graph is long, errors are easy to occur, the graph is irregular and the like are effectively solved. Meanwhile, great convenience is provided for distribution network engineering personnel during graphic maintenance and upgrading.
The specific embodiments are given above, but the present invention is not limited to the described embodiments. The basic idea of the present invention lies in the above basic scheme, and it is obvious to those skilled in the art that no creative effort is needed to design various modified models, formulas and parameters according to the teaching of the present invention. Variations, modifications, substitutions and alterations may be made to the embodiments without departing from the principles and spirit of the invention, and still fall within the scope of the invention.
Claims (4)
1. A method for automatically generating a power distribution network area graph is characterized by comprising the following steps:
(1) extracting all connection relations of the transformer substation, sequentially analyzing the connection relations among the transformer substations and station rooms and equipment in the connection relations, and storing the connection relations and the station rooms and the equipment in a channel form;
(2) dividing the channel into a loop channel, a single-pair single channel and a multi-connection relationship channel;
(3) carrying out local layout on the station rooms in the multi-connection relation channel; addressing and placing station rooms and equipment in a loop back channel and a single pair of single channels;
(4) drawing a connecting line according to the connection relation of the whole graph, and adding a switch device;
the process of realizing the local layout comprises the following steps:
1) performing initial layout according to the local connection relation;
2) the local connection relation is laid out by utilizing a guiding algorithm;
3) gridding the local connection relation which is distributed by using a guiding algorithm;
4) performing orthogonalization processing on the local connection relation after layout;
5) compressing the layout of the local connection relation by using a window mode;
the guiding algorithm is an algorithm for determining the vector distance of the equipment which needs to move in the operation by calculating the resultant force and the direction of each equipment moving at the point according to the local connection relation until all the equipment is not crossed and misaligned, the resultant force consists of the pulling force and the pushing force applied to the point, and the calculation formula of the guiding algorithm is as follows:
wherein, L is a natural length set according to the number of points in the Power distribution network data and a required graph density, Dis is a distance between a point to be calculated and another point, Tension is a tensile force, replay is a thrust force, Power is the number of devices passing from a point V1 to a point V2, k is a set coefficient, Mass (V1) is the number of devices directly connected to a point V1, Mass (V2) is the number of devices directly connected to a point V2, and Fr is a set empirical coefficient;
the gridding process comprises the following steps: reducing the whole area into the area occupied by the equipment and the station rooms, determining grids according to the picture proportion, and putting all the station rooms and the equipment into the grids with the shortest distance;
the orthogonal processing process comprises the following steps: judging whether the equipment is on the same horizontal or vertical line according to the angle of the relative position of the equipment and the station room, if not, placing the equipment on the same horizontal or vertical line according to the principle that the relative angle moves the minimum distance;
the window is the maximum grid distance occupied by the devices with connection relations in the grid rows or columns, in the compression process, each row or each column of grids is scanned firstly, if the row or the column has the devices placed, whether the devices have the connection relations is checked, the grid occupied by the devices with connection relations in each row or the column and the maximum grid distance from any device to another device are fixed as the current window, if no device exists in the grid area of the next row or the column of the window, the window is compressed to the next row or the column, otherwise, the window is continuously scanned downwards without fixation, if the next row or the column has the device and the length of the window formed by the devices is larger than that of the current window, the window of the next row is fixed as the current window and is continuously checked downwards until the boundary is reached.
2. The method according to claim 1, wherein the single-pair single channel is a situation where the channel is connected to only two different substations, and the process of placing the devices in the single-pair single channel is as follows: the method comprises the steps of firstly analyzing the positions of two substations in a channel to determine the position of terminal equipment, then addressing according to the position of the terminal equipment and the wiring direction to find a grid area where other equipment can be placed, and finally placing the equipment in the grid area to finish single-pair single-channel processing.
3. The method according to claim 2, wherein if a channel connects only two substations, and the two substations are the same substation, the channel is a loop channel, and the placement process of the equipment in the loop channel is as follows: after the placement positions of the terminal devices are determined, the devices are sequentially placed along the placement direction of the terminal devices.
4. The method for automatically generating the power distribution network area graph according to claim 1, wherein the switching devices are added in a manner that the switching devices are added in a space of the boundary of the station room and the grid where the devices belong or have a connection relation.
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