CN108170871B

CN108170871B - Element browsing method and graphic layout method for electromagnetic transient topology data

Info

Publication number: CN108170871B
Application number: CN201611116281.2A
Authority: CN
Inventors: 陈珍珍; 江然
Original assignee: State Grid Corp of China SGCC; China Electric Power Research Institute Co Ltd CEPRI
Current assignee: State Grid Corp of China SGCC; China Electric Power Research Institute Co Ltd CEPRI
Priority date: 2016-12-07
Filing date: 2016-12-07
Publication date: 2023-08-18
Anticipated expiration: 2036-12-07
Also published as: CN108170871A

Abstract

The application provides an element browsing method and a graph layout method for electromagnetic transient topological data, wherein the element browsing method comprises the following steps: taking a first element of a power supply class as an initial searching element, and starting a recursive searching process; searching the next element with the connection relation according to the node name relation of the topological data element; browsing each communication branch in turn according to the depth priority order; and finishing browsing all elements of each connected graph until all elements of the topology data file are traversed. The graphic layout includes: and positioning the positions of the elements in the network graph during the element browsing process, and establishing connection relations among the element nodes according to the element searching relations. The technical scheme provided by the application effectively solves the key technical problem of automatic conversion from electromagnetic transient topological data to network graphics, simplifies the modeling flow of the EMTS electromagnetic transient simulation graphics, saves the time of manual interaction modeling, avoids parameter entry errors or topological connection relation errors possibly caused by manual operation, and has good practical value.

Description

Element browsing method and graphic layout method for electromagnetic transient topology data

Technical Field

The application belongs to the fields of electromagnetic transient simulation, computer visualization technology and application mathematics of a power system, and particularly relates to an element browsing method and a graphic layout method for electromagnetic transient topological data.

Background

The simulation modeling and visual computing technology of the large-scale power system based on the electromagnetic transient model is a future research direction. The EMTPE/EMTS simulation software plays an important supporting role in the field of electromagnetic transient simulation of domestic power systems, develops an EMTS (electro-magnetic transient simulator, electromagnetic transient simulation system) graph conversion generation system aiming at a great deal of available topology data resources at present, realizes automatic conversion from electromagnetic transient topology data to an EMTS graph simulation model, facilitates EMTS visual graph simulation, and has important significance for developing related research work in the field.

The EMTS electromagnetic transient pattern simulation platform based on EMTPE development provides a pattern and model integrated simulation platform integrating pattern modeling, simulation operation and output processing, has wide application and popularization in the power industry and universities, and is accepted by wide users. In order to fully exert the advantages of the EMTS simulation platform, a data-graph conversion system is developed, an existing topology data file is automatically converted into an EMTS graphical network model, the transparency of the simulation model is increased, a user can intuitively check or change the network topology structure of the system based on the EMTS platform, the element parameters are conveniently checked and modified, and errors are conveniently controlled in an initial stage. Meanwhile, the research of various different working conditions can be simply realized by a graph operation method.

At present, the power department has a large amount of power system network topology data stored in a PSD-BPA format, and can be effectively equivalent to an EMTPE electromagnetic transient simplified network model. As the development of electromagnetic transient simulation research of the power system mostly adopts the EMTPE simulation software, a great amount of topological data resources in the format of electromagnetic transient EMTPE (Electromagnetic Transient and Power Electronic simulation program ) are accumulated, and users usually directly use the topological data to perform EMTPE simulation calculation. The manual construction of a graphic system based on the data models is relatively complicated work, a large amount of manual interaction modeling operation time is required to be consumed, and errors are easy to occur in the input of a large amount of parameter data and the processing of topological connection relations, so that most researches usually avoid graphic modeling and directly adopt a character model to perform simulation calculation and operation, the conventional graphic simulation platform cannot be utilized to perform visual graphic simulation, and the development of deep research work on the basis of original data is not facilitated.

Disclosure of Invention

Aiming at the defects of the prior art, the application provides an element browsing method and a graph layout method for electromagnetic transient topological data.

An element browsing method for electromagnetic transient topology data, the element browsing method comprising:

I. taking a first element of a power supply class as an initial searching element, and starting a recursive searching process;

II. Searching the elements with the connection relation according to the node name relation of the topological data elements, and traversing all the elements in the topological data file.

Further, the step I includes:

i-1, judging the node name of the front element;

i-2, judging whether the power supply type element which is the same as the node name of the front element is processed;

i-3, taking a new element of a non-browsed power supply type, and judging whether the left and right node names of the new element are the same as the front node name;

and I-4, judging whether the new element has a non-browsed node.

Further, the browsing includes browsing of single-phase elements, three-phase elements and multi-phase elements, and the browsing process automatically distinguishes the single-phase elements, the three-phase elements and the multi-phase elements.

Further, the step II includes: and sequentially performing depth-first recursive search and call on all nodes of each element on the communication branch, sequentially completing browsing of all branches and elements of each communication graph, and finally completing traversal of all elements in the topology data file.

A method of graphical layout, the method comprising: the element browsing method according to any one of claims 1-4 is adopted to complete the traversal of all elements in the topology data file;

and simultaneously positioning the positions of the elements in the network graph in the element browsing traversal process, and establishing the connection relationship among the elements.

Further, the positioning includes: the first element is positioned at the left upper corner of the graph, the connected elements are sequentially arranged at the graph position, and the parallel branches sink to one level for sequential arrangement.

Further, the connection relation includes: the single line drawing element is connected to the multi-line drawing element.

Compared with the closest prior art, the technical scheme provided by the application has the following beneficial effects:

1. the application effectively solves the key technical problem of automatic conversion from electromagnetic transient topological data to network graphics, simplifies the modeling flow of the EMTS electromagnetic transient simulation graphics, saves the time of manual interaction modeling, avoids parameter entry errors or topological connection relation errors possibly caused by manual operation, and has good practical value.

2. The application can identify and process the single-phase element, the three-phase element and the multi-phase element to the corresponding single-line diagram element or multi-line diagram element, and automatically distinguish the single-phase node and the three-phase node according to the node name rule and the sequence of the topological data element.

3. The single line diagram priority principle of the application enables the generating system to be simple and effective, and one single line virtual element generally represents three single-phase elements of the multi-line virtual element at the same time. For the elements which cannot be represented by single-line virtual elements, the elements are represented by multi-line virtual elements, the connection relation between the elements and the single-line virtual elements can be connected through 1-to-3 or 3-to-1 virtual elements, and the reverse phase sequence structural elements are processed in a multi-line graphic mode.

4. The topology structure and model parameters of the application are consistent before and after conversion, and the simulation running results have no difference. The topology data is automatically converted into a graphic model, and a precondition is created for developing large-scale electromagnetic transient graphic simulation in the future.

Drawings

FIG. 1 is a flow chart of a method for browsing elements of electromagnetic transient topology data;

FIG. 2 is a flow chart of an element browsing method implementation in an automatic layout process;

FIG. 3 is a typical EMTPE topology data file in an embodiment of the application;

FIG. 4 is an EMTS simulation graph converted by the present application;

fig. 5 is a diagram of a connection between a single line drawing element and a multi-line drawing element.

Detailed Description

In order to make the objects, technical solutions and advantages of the present application more apparent, the present application will be further described in detail with reference to the accompanying drawings.

Embodiment 1, fig. 1 is a flow chart of an element browsing method of electromagnetic transient topology data. The method is mainly used for realizing a component browsing method adopted in an automatic layout process, searching and positioning components:

(1) Taking a first element of a power supply class as an initial searching element, and starting a recursive searching process; the head element is positioned in the upper left corner of the figure.

(2) Searching elements with connection relations according to node name relations of topological data elements, sequentially performing depth-first recursive search and call on all nodes of each element on a communication branch respectively until all elements on one communication branch are searched, searching for the next communication branch, and finally traversing all elements in a topological data file.

(3) The component browsing traversal process locates the locations of the components in the network graph at the same time, and establishes connection relationships between the component nodes according to the component searching relationships, which are created in a connection form.

Embodiment 2, fig. 2 is a schematic diagram of an internal implementation flow of a component search recursion algorithm that is repeatedly invoked during an automatic layout process. The search element that first invokes the process is typically the power element, and the element search process begins with the first unviewed power element as the starting point. The function uses the element object, the initial search node name and the node label of the previous element as search conditions to search for the next matching element and the node. Specifically, the method comprises the following main steps.

The first step: and judging the node name of the front element. If the node name is empty, the front element is to be distinguished to be grounded through a connecting wire or the internal node of the transformer element is directly grounded, and the return call entrance is ended after the processing of the two cases is finished. If the node name is not empty, it is distinguished whether the front element is connected to the bus and then ends to return, or whether a connection is added between the front element of the non-power class and the other power elements.

And a second step of: and judging whether other power supply type elements with the same node name as the front element are processed completely, if not, continuing processing, otherwise, switching to the searching process of other non-power supply type elements.

And a third step of: and taking down the non-browsed non-power source element as a new element, respectively judging whether the left and right node names are the same as the front node name, if so, indicating that a connection relationship exists, positioning the graph position of the new element, setting the browsed state, and establishing the connection relationship between the matching node of the new element and the front element.

Fourth step: if the new element has other nodes which are not browsed, the next element is continuously searched by taking the nodes as starting points, and a recursion calling process is carried out. If the other nodes of the new element are processed, the third step is carried out to fetch the other unbrown elements to continue processing. And ending the return if no other element can process.

Because the node number and the phase number form related to different types of elements are different, the process is classified and refined according to element classification during actual browsing. The automatic bus adding is required for the transformer after the parallel connection of the power supply or for other elements after the parallel connection of the transformer, so that the above-mentioned process has special distinguishing treatment for the transformer elements.

Example 3, fig. 3 illustrates an example of a typical EMTPE topology data file, which demonstrates the implementation of the proposed method of the present application. The 9 th to 90 th rows of the file contain a plurality of element model data and topology relation descriptions, and the 3-14 columns are usually branch node names BUS1-BUS2, and the names and node name relations of part of elements in the file are briefly described below, so that key nodes and element sequences on element search paths are conveniently understood. Three rows 10-12 in the file represent a three-phase resistance element, the names of three single-phase nodes at the left end of the element accord with A, B, C prefix rule, and the names of three single-phase nodes at the right end are all blank spaces, so that the three-phase resistance element can be combined into a three-phase resistance element, and the branch names RBL- "; lines 14, 16 and 18 respectively represent 3 single-phase inductance elements, and the names corresponding to the three single-phase branches are respectively CSRK2-SRKN, BSRK2-SRKN and ASRK2-SRKN, and the left end and the right end of the single-phase inductance elements do not meet the A, B, C prefix rule at the same time, so that the single-phase inductance elements cannot be combined into one three-phase element in a single-line diagram form; line 20 is a single-phase inductive element SRKN- "; the node names of the 22 th line to the 24 th line simultaneously accord with A, B, C prefix rule, so that the node names are combined into a three-phase coupling RL element, and the branch names SBHG-SBH; lines 29-40 represent a three-phase double-winding transformer element data model, wherein the high-voltage end can be combined with a three-phase node name SBH, a medium-voltage end three-phase node name SBM and a low-voltage end three-phase node name SBL; lines 83-85 represent a three-phase voltage source element, the combined three-phase node name SBHG; other elements are not listed.

The conversion result of fig. 4 is obtained after the browsing method and the layout of the element graph proposed in this patent are implemented, and the specific conversion process is illustrated in fig. 4.

In embodiment 4 and fig. 4, the browsing method and the element pattern layout method proposed in the present patent convert the topology data to obtain the EMTS simulation pattern, and the pattern is rotated to the left by 90 degrees for clarity. The lower left 14-type power supply SBHG is actually located in the upper left corner of the EMTS graphical layout, and is the starting browsing element determined according to the present browsing method, i.e. the element search process is started from the first power supply element.

The following briefly describes the order of elements searched for according to the present browsing method: 1) Searching other non-browsed elements with the node name SBHG by taking the first power element SBHG as a starting point, and searching for an RL element with the branch name SBHG-SBH; 2) Calling a search function by taking the RL element as a front element and taking the right node SBH as a front node name, and searching for the three-phase double-winding transformer SBH-SBM; 3) The right node SBM of the transformer is used for searching the next switching element SBM-SBK1, the right node SBK1 of the switching element is used for searching the Line0 Line element SRK1-RSK1, the right node RSK1 is used for searching the switching element RSK1-RBH, and the right node RBH is used for searching the three-phase three-winding transformer RBH-RBM-RBL; 4) The right node RBM of the transformer is used for sequentially searching the RL element RBM-RBMG and the power supply RBMG, so as to finish the first branch of depth-first browsing, and the first branch corresponds to each element sequence formed by connecting the leftmost part of the transformer from bottom to top in the figure 4. 5) According to the element search function flow of fig. 2, when all nodes of an element have completed searching, the search is ended and the last element is returned. And when the step 4 returns the front element to the three-phase three-winding transformer RBH-RBM-RBL in reverse order, searching the other branch from the T node RBL which is not browsed by the transformer, searching the three-phase ground resistance RBL- ", and ending the return. 6) The search is carried out step by step until the right node SBM of the three-phase double-winding transformer SBH-SBM, another parallel branch SBM-SRK2-RSK2-RBH is arranged from the node, and two three-phase switch elements with RBH as the right node are added to form a loop. 7) Step-by-step rollback of the element searched in the step 6 to an SRK2 node, wherein the node starts to enter element searching of the single-phase sub-circuit through a 1-to-3 virtual element, and single-phase inductance CSRK2-SRKN and single-phase to-ground inductance SRKN- "" are sequentially searched; rollback browse B-phase inductor BSRK2-SRKN, and adding a right-end SRKN connecting line; and backing to browse the A-phase inductor ASRK2-SRKN, and adding a right-end SRKN connecting line. 8) And returning the recursive search call step by step until all the element nodes are browsed.

The above description process mainly focuses on the element browsing sequence of the method, and other aspects, such as element browsing state setting, connection switching of the three-phase element and the single-phase element, element pattern position determination, and the like, are not described in detail.

Example 5, fig. 5, with some modifications on the basis of fig. 4, shows the connection transition between the single-LINE diagram element and the multi-LINE diagram element, for which purpose the two three-phase LINE elements LINE0 in the single-LINE diagram form of fig. 4 are changed into two LINE models in the multi-LINE diagram form, one 6-phase and the other 3-phase. When node names accord with A, B, C prefix or A, B, C suffix law, the elements are automatically processed according to three-phase elements, corresponding nodes are processed according to three-phase nodes, and when node names of one phase of the three-phase elements are identical to node names of the other single-phase element, a 1-to-3 virtual element of a connection relation between a single line diagram and a multi-line diagram is automatically added between the two elements for connection; when the sequences of the two elements are opposite, a 3-to-1 virtual element is automatically added to connect the multi-line diagram and the single-line diagram. The browsing method is also suitable for searching 6-phase and above elements.

The number of element nodes in the multi-line diagram mode is relatively large, each node is searched in sequence during element searching, and single-phase thin connecting lines are adopted for connecting lines among single-phase nodes of different elements. When the multi-line diagram element is connected with the single-line diagram element, the connection is carried out through a 3-to-1 virtual element, for example, in the figure, the multi-line diagram pi element 3-8 is connected with the single-line diagram switching element 8-10 through a 3-to-1 virtual element, and the other 3-phase line model 2-8 is also connected with the 3-phase node 8 through the 3-to-1 virtual element. The connection between the three phase nodes of different three phase elements is represented by three phase thick connecting lines, which are three phase elements and three phase connecting lines, and which are single phase elements and single phase connecting lines can be clearly seen from the figure.

Both branches coming out from the right end of the transformer SG-SB in FIG. 5 are switched by connecting the single line diagram and the multiple line diagram through 1-to-3.

Finally, it should be noted that: the above embodiments are only for illustrating the technical aspects of the present application and not for limiting the same, and although the present application has been described in detail with reference to the above embodiments, it should be understood by those of ordinary skill in the art that: modifications and equivalents may be made to the specific embodiments of the application without departing from the spirit and scope of the application, which is intended to be covered by the scope of the claims.

Claims

1. An element browsing method for electromagnetic transient topology data, the element browsing method comprising:

searching for a next matching element and a node by taking an element object, a starting searching node name and a node label of the previous element as searching conditions;

II. Searching elements with connection relations according to node name relations of topological data elements, and traversing all elements in a topological data file;

the step I comprises the following steps:

i-1, judging the node name of the front element;

judging the node name of the front element, if the node name is empty, distinguishing whether the front element is grounded through a connecting wire or the internal node of the transformer element is directly grounded, and ending the return call entrance after the two cases are processed;

if the node name is not empty, distinguishing whether the front element is connected with the bus and then returns, or whether a connecting line is added between the front element of the non-power supply class and other power supply elements;

if not, continuing processing, otherwise, switching to a search process of other non-power supply elements;

if the two elements are the same, a connection relation is indicated, the graph position of the new element is positioned, the browsed state is set, and the connection relation between the matching node of the new element and the front element is established;

i-4, judging whether the new element has a node which is not browsed, and respectively taking the nodes as starting points to continue searching for the next element, and entering a recursion calling process; if the other nodes of the new element are processed, turning to the third step to take other unbrown elements for continuous processing; ending the return if no other elements are available for processing;

the browsing comprises browsing of single-phase elements, three-phase elements and multi-phase elements, and the browsing process automatically distinguishes the single-phase elements, the three-phase elements and the multi-phase elements;

when node names accord with A, B, C prefix or A, B, C suffix law, the elements are automatically processed according to three-phase elements, corresponding nodes are processed according to three-phase nodes, and when node names of one phase of the three-phase elements are identical to node names of the other single-phase element, a 1-to-3 virtual element of a connection relation between a single line diagram and a multi-line diagram is automatically added between the two elements for connection; when the sequences of the two elements are opposite, a 3-to-1 virtual element is automatically added to connect the multi-line diagram and the single-line diagram;

the number of element nodes in the multi-line diagram form is relatively large, each node is searched in sequence during element searching, and connecting lines among single-phase nodes of different elements adopt single-phase fine connecting lines; the connection of the multi-line drawing element and the single-line drawing element is performed through a 3-to-1 virtual element.

2. The method for browsing elements of electromagnetic transient topology data of claim 1, wherein said step II comprises: and sequentially performing depth-first recursive search and call on all nodes of each element on the communication branch, sequentially completing browsing of all branches and elements of each communication graph, and finally completing traversal of all elements in the topology data file.

3. A method of graphic layout, the method comprising: the element browsing method according to any one of claims 1-2 is adopted to complete the traversal of all elements in the topology data file;

4. A method of graphical layout as claimed in claim 3 wherein said locating comprises: the first element is positioned at the left upper corner of the graph, the connected elements are sequentially arranged at the graph position, and the parallel branches sink to one level for sequential arrangement.

5. The graphic layout method according to claim 4, wherein the connection relationship includes: the single line drawing element is connected to the multi-line drawing element.