CN113608071A - Method for establishing distribution network line fault analysis model - Google Patents
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Abstract
The invention relates to a method for establishing a distribution network line fault analysis model, and belongs to the technical field of electric power. According to the method, tower information is obtained through an image recognition method, table information describing line parameters is read, and the simulation data of the line tower model which can be read by PSCAD is automatically generated on the basis. The method provided by the invention is convenient for PSCAD users to quickly establish the distribution network line tower model, effectively reduces the manual workload of data entry, improves the speed of simulation modeling, and has strong engineering practicability.
Description
Technical Field
The invention belongs to the technical field of electric power, and relates to a method for establishing a distribution network line fault analysis model.
Background
PSCAD/EMTDC is electromagnetic transient simulation software widely applied to the field of power system fault analysis. When fault analysis is carried out on a high-voltage distribution line, a pole tower model is usually adopted to depict the line under the scene of needing fine modeling. At present, the conventional method for establishing a line tower model in the PSCAD is as follows: and manually establishing a Tline model according to the collected information such as the tower schematic diagram, the line parameters and the like. This manual modeling approach is cumbersome and time consuming for data filling and data verification. When the line is long and the conditions of transposition, inconsistency of types of wires or ground wires along the way and the like exist, a plurality of Tline models are often required to be manually established, and the workload is large. In view of this, it is necessary to replace part of the manual modeling with a computer program to develop a method capable of efficiently establishing a distribution network line fault analysis model.
Disclosure of Invention
In view of this, the present invention provides a method for establishing a distribution network line fault analysis model.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for establishing a distribution network line fault analysis model comprises the following steps:
s1: acquiring tower information by an image identification method;
s2: reading table information describing line parameters;
s3: and generating simulation data of the line tower model which can be read by PSCAD automatically.
Optionally, in S1, the input data of the image recognition method is a tower schematic diagram, where the tower schematic diagram describes the shape of the tower and has a label of the external dimensions of the tower; the step of obtaining the tower information by the image recognition method comprises the following steps:
s11: collecting tower schematic diagrams of a line, and numbering tower schematic diagrams of different types;
s12: sequentially extracting the profile characteristics of the tower in the tower schematic diagram to obtain tower type information;
s13: sequentially extracting marks of the overall dimensions of the tower in a tower schematic diagram, and obtaining the height of a ground wire suspension point from the ground, the horizontal distance between the ground wire and the center of the tower, the height of a three-phase wire from the ground and the horizontal distance information of the three-phase wire suspension point and the center of the tower by combining the type of the tower;
s14: and numbering and storing tower information according to the tower schematic diagram.
Optionally, in S2, the table describing the line parameters includes the line segment length, the type of the conductor, the outer diameter of the conductor, the number of the conductor structures, the direct current resistance of the conductor, the type of the ground wire, the outer diameter of the ground wire, the direct current resistance of the ground wire, the number of the tower diagrams, the arrangement order of the conductors, and the like;
regarding two adjacent sections in the line, if any one of the situations of transposition, different tower types of the erected towers, different lead types and different ground wire types exists, regarding the two adjacent sections as two line sections and using the two line sections as two rows of data adjacent to each other in the table; the rows in the table should be arranged in order according to the position of the corresponding line segment in the line.
Optionally, in S3, the step of automatically generating the PSCAD-readable line tower model simulation data includes:
s31: acquiring the number of data lines of the table describing the line parameters in the S2, if only one line exists, executing S32, otherwise executing S33;
s32: inserting a default attribute text for describing a Tline model into an empty PSCAD simulation data file, updating the line length, the outer diameter of a lead, the number of the structural roots of the lead, the direct current resistance of the lead, the model of the ground wire, the outer diameter of the ground wire, the direct current resistance of the ground wire and the arrangement sequence attribute of the lead in the Tline model according to line data in a table, acquiring information of a corresponding tower according to the number of a tower diagram in the line data, updating the position attribute of the lead and the ground wire in the Tline model, and executing S37;
s33: inserting a default attribute text describing the self-defined module into an empty PSCAD simulation data file, and updating the attributes of the display appearance of the module, the coordinates of the module on a canvas and the number of external electrical connection ports of the module, wherein the number of the external electrical connection ports of the module is 2;
s34: according to a table for describing line parameters obtained by traversing S2 row by row, for each row in the table, inserting a default attribute text of a Tline model into the custom module attribute text mentioned in S33, updating attributes of line section length, wire outer diameter, wire structure number, wire direct current resistance, ground wire model, ground wire outer diameter, ground wire direct current resistance and wire arrangement sequence in the Tline model according to data of the corresponding row in the table, then acquiring information of a corresponding tower according to the tower schematic diagram number in the row of data, and further updating position attributes of the wire and the ground wire in the Tline model;
s35: inserting default attribute texts of two xnode models into the custom module attribute text mentioned in the step S33;
s36: calculating the abscissa and ordinate of the interface elements of the xnode model and the Tline model according to the size of the canvas corresponding to the custom module and the number of the line sections and based on the principle that two xnodes are required to be respectively connected with the initial section and the final section of the line and each Tline model is required to be connected in sequence, and further updating the corresponding attributes in the model definitions in the simulation data file;
s37: and finishing the creation of the simulation data of the line tower model.
The invention has the beneficial effects that:
(1) according to the method for establishing the distribution network line fault analysis model, the PSCAD readable simulation data of the line tower model are generated through a program, and the repetitive manual modeling workload is greatly reduced.
(2) The method for establishing the distribution network line fault analysis model provided by the invention has the advantages of strong operability and high engineering practical value.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the invention may be realized and attained by the means of the instrumentalities and combinations particularly pointed out hereinafter.
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For the purposes of promoting a better understanding of the objects, aspects and advantages of the invention, reference will now be made to the following detailed description taken in conjunction with the accompanying drawings in which:
FIG. 1 is a flow chart of the present invention.
Detailed Description
The embodiments of the present invention are described below with reference to specific embodiments, and other advantages and effects of the present invention will be easily understood by those skilled in the art from the disclosure of the present specification. The invention is capable of other and different embodiments and of being practiced or of being carried out in various ways, and its several details are capable of modification in various respects, all without departing from the spirit and scope of the present invention. It should be noted that the drawings provided in the following embodiments are only for illustrating the basic idea of the present invention in a schematic way, and the features in the following embodiments and examples may be combined with each other without conflict.
Wherein the showings are for the purpose of illustrating the invention only and not for the purpose of limiting the same, and in which there is shown by way of illustration only and not in the drawings in which there is no intention to limit the invention thereto; to better illustrate the embodiments of the present invention, some parts of the drawings may be omitted, enlarged or reduced, and do not represent the size of an actual product; it will be understood by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numerals in the drawings of the embodiments of the present invention correspond to the same or similar components; in the description of the present invention, it should be understood that if there is an orientation or positional relationship indicated by terms such as "upper", "lower", "left", "right", "front", "rear", etc., based on the orientation or positional relationship shown in the drawings, it is only for convenience of description and simplification of description, but it is not an indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation, and be operated, and therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes, and are not to be construed as limiting the present invention, and the specific meaning of the terms may be understood by those skilled in the art according to specific situations.
As shown in fig. 1, the method for establishing a distribution network line fault analysis model includes the following steps:
s1: and acquiring tower information by an image identification method.
The substep of obtaining the tower information by the image recognition method is as follows:
s11: collecting tower schematic diagrams of a line, and numbering tower schematic diagrams of different types;
s12: sequentially extracting the profile characteristics of the tower in the tower schematic diagram to obtain tower type information;
s13: sequentially extracting marks of the overall dimensions of the tower in a tower schematic diagram, and obtaining information such as the height of a ground wire suspension point from the ground, the horizontal distance between the ground wire and the center of the tower, the height of a three-phase wire from the ground, the horizontal distance between the three-phase wire suspension point and the center of the tower and the like by combining the type of the tower;
s14: and numbering and storing tower information according to the tower schematic diagram.
S2: table information describing line parameters is read.
The table for describing line parameters comprises the line segment length, the type of the lead, the outer diameter of the lead, the number of the structure of the lead, the direct current resistance of the lead, the type of the ground wire, the outer diameter of the ground wire, the direct current resistance of the ground wire, the number of the schematic diagrams of the towers, the arrangement sequence of the leads and the like; regarding two adjacent sections in the line, if any one of the situations of transposition, different tower types of the erected towers, different lead types and different ground wire types exists, regarding the two adjacent sections as two line sections and using the two line sections as two rows of data adjacent to each other in the table; the rows in the table should be arranged in order according to the position of the corresponding line segment in the line.
The table may be in Excel, a database table, or other file format that is easy to read by a program.
S3: and generating simulation data of the line tower model which can be read by PSCAD automatically.
The sub-steps of automatically generating the PSCAD readable line tower model simulation data are as follows:
s31: acquiring the number of data lines of the table describing the line parameters in the step S2, if there is only one line, performing the substep S32, otherwise performing the substep S33;
s32: inserting a default attribute text for describing a Tline model into an empty PSCAD simulation data file (XML file format), updating attributes such as line length, wire outer diameter, wire structure number, wire direct current resistance, ground wire model, ground wire outer diameter, ground wire direct current resistance, wire arrangement sequence and the like in the Tline model according to line data in a table, acquiring information of a corresponding tower according to the tower schematic diagram number in the line data, further updating position attributes of a wire and a ground wire in the Tline model, and executing a substep S37;
s33, inserting a default attribute text describing the self-defined module into an empty PSCAD simulation data file, and updating the attributes of the display appearance of the module, the coordinates of the module on a canvas, the number of external electrical connection ports of the module and the like, wherein the number of the external electrical connection ports of the module is 2;
s34 traverses the table describing the line parameters obtained in step S2 line by line, inserts a default attribute text of the Tline model into the custom module attribute text mentioned in sub-step S33 for each line in the table, updates attributes such as a line segment length, a wire outer diameter, a wire structural number, a wire direct current resistance, a ground wire model, a ground wire outer diameter, a ground wire direct current resistance, a wire arrangement order, and the like in the Tline model according to data of a corresponding line in the table, acquires information of a corresponding tower according to a tower diagram number in the line of data, and further updates position attributes of the Tline model about the wires and the ground wires;
s35: inserting default attribute texts of two xnode models (representing external electrical nodes) into the custom module attribute texts mentioned in the substep S33;
s36: calculating the abscissa and ordinate of interface elements of the xnode model and the Tline model according to the size of the canvas corresponding to the custom module and the number of the line sections and based on the principle that two xnodes are required to be respectively connected with the initial section and the final section of the line and each Tline model is required to be connected in sequence, and further updating corresponding attributes in the model definitions in the simulation data file;
s37: and finishing the creation of the simulation data of the line tower model.
Finally, the above embodiments are only intended to illustrate the technical solutions of the present invention and not to limit the present invention, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that modifications or equivalent substitutions may be made on the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the claims of the present invention.
Claims (4)
1. A method for establishing a distribution network line fault analysis model is characterized in that: the method comprises the following steps:
s1: acquiring tower information by an image identification method;
s2: reading table information describing line parameters;
s3: and generating simulation data of the line tower model which can be read by PSCAD automatically.
2. The method for establishing the distribution network line fault analysis model according to claim 1, wherein the method comprises the following steps: in the step S1, the input data of the image recognition method is a tower diagram, and the tower diagram describes the shape of the tower and is provided with a label of the overall dimension of the tower; the step of obtaining the tower information by the image recognition method comprises the following steps:
s11: collecting tower schematic diagrams of a line, and numbering tower schematic diagrams of different types;
s12: sequentially extracting the profile characteristics of the tower in the tower schematic diagram to obtain tower type information;
s13: sequentially extracting marks of the overall dimensions of the tower in a tower schematic diagram, and obtaining the height of a ground wire suspension point from the ground, the horizontal distance between the ground wire and the center of the tower, the height of a three-phase wire from the ground and the horizontal distance information of the three-phase wire suspension point and the center of the tower by combining the type of the tower;
s14: and numbering and storing tower information according to the tower schematic diagram.
3. The method for establishing the distribution network line fault analysis model according to claim 2, wherein the method comprises the following steps: in the step S2, the table describing the line parameters includes the line segment length, the type of the conductor, the outer diameter of the conductor, the number of the conductor structure, the direct current resistance of the conductor, the type of the ground wire, the outer diameter of the ground wire, the direct current resistance of the ground wire, the number of the tower schematic diagram, the arrangement sequence of the conductor and the like;
regarding two adjacent sections in the line, if any one of the situations of transposition, different tower types of the erected towers, different lead types and different ground wire types exists, regarding the two adjacent sections as two line sections and using the two line sections as two rows of data adjacent to each other in the table; the rows in the table should be arranged in order according to the position of the corresponding line segment in the line.
4. The method for establishing the distribution network line fault analysis model according to claim 3, wherein the method comprises the following steps: in S3, the step of automatically generating the PSCAD-readable line tower model simulation data includes:
s31: acquiring the number of data lines of the table describing the line parameters in the S2, if only one line exists, executing S32, otherwise executing S33;
s32: inserting a default attribute text for describing a Tline model into an empty PSCAD simulation data file, updating the line length, the outer diameter of a lead, the number of the structural roots of the lead, the direct current resistance of the lead, the model of the ground wire, the outer diameter of the ground wire, the direct current resistance of the ground wire and the arrangement sequence attribute of the lead in the Tline model according to line data in a table, acquiring information of a corresponding tower according to the number of a tower diagram in the line data, updating the position attribute of the lead and the ground wire in the Tline model, and executing S37;
s33: inserting a default attribute text describing the self-defined module into an empty PSCAD simulation data file, and updating the attributes of the display appearance of the module, the coordinates of the module on a canvas and the number of external electrical connection ports of the module, wherein the number of the external electrical connection ports of the module is 2;
s34: according to a table for describing line parameters obtained by traversing S2 row by row, for each row in the table, inserting a default attribute text of a Tline model into the custom module attribute text mentioned in S33, updating attributes of line section length, wire outer diameter, wire structure number, wire direct current resistance, ground wire model, ground wire outer diameter, ground wire direct current resistance and wire arrangement sequence in the Tline model according to data of the corresponding row in the table, then acquiring information of a corresponding tower according to the tower schematic diagram number in the row of data, and further updating position attributes of the wire and the ground wire in the Tline model;
s35: inserting default attribute texts of two xnode models into the custom module attribute text mentioned in the step S33;
s36: calculating the abscissa and ordinate of the interface elements of the xnode model and the Tline model according to the size of the canvas corresponding to the custom module and the number of the line sections and based on the principle that two xnodes are required to be respectively connected with the initial section and the final section of the line and each Tline model is required to be connected in sequence, and further updating the corresponding attributes in the model definitions in the simulation data file;
s37: and finishing the creation of the simulation data of the line tower model.
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| CN103838921A (en) * | 2014-02-13 | 2014-06-04 | 华北电力大学（保定） | PSCAD-EMTDC simulation model automatic generation method |
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