Power system visualization graphics generation system

The main electrical wiring is a circuit for the production, exchange, transmission and distribution of electrical energy formed in a certain order according to the electrical equipment and the respective functions. In order to meet the different requirements in each process, these electrical equipment and electrical appliances may have various wiring forms. Forming various operating modes of electrical parts of power plants and substations, from the perspective of electric energy production management and the irresistible law of electric energy production and consumption, the calculation of short-circuit calculation of power system power flow and the study of electric power system operation tickets have changed. It is getting more and more important. In recent years, with the rapid development of computer technology, microcomputers have become one of the new methods of power system analysis. Some object-based graphics generation and management systems have emerged, such as secondary development of power systems using AutoCAD; using MANDISP The software package performs simulation processing of the power system, etc., but most of them are not closely related to the database or the application scope is relatively simple.

The graphic system not only completes the drawing of power graphic components, but more importantly, the system can automatically number the network topology and power flow structure of each power plant and substation. The system has been applied to the adaptive downfall of Dagang Hydropower Plant. The gate operation ticket system has achieved the expected effect. 2 The overall block diagram system of the graphics system is not currently interfaced with real-time data. It is developed under offline conditions. It is divided into two parts: graphic drawing and grid comprehensive database. The overall design idea, such as forming the component information database in the tooling area, is the basis of the visual drawing. The dynamic generation of the network topology and the power flow structure using the drawn graphics is the core of the graphics system.

3 graphics drawing function and graphics storage The power components in this system are independent of each other, so we can classify the power components, each type of components form a class module. In order to realize the interface of the external program parameters and class communication, we are in the drawing. The Win32 API function is used to ensure the unity of graphic drawing and graphic coordinate position. Since the network topology structure is searched according to the judgment elements connected, after the graphics are drawn, we also dynamically determine the area of ​​the graphic element, and the area where the element is connected with other components, specifically the graphics drawing part realizes the following Function: component drawing, component movement, component deletion, block movement, block deletion, graphic enlargement and reduction (according to a certain ratio) graphic color selection Since graphics are generated by class, component storage also needs to be performed by class, and the state in each class The parameters are independent of each other. Based on these characteristics of the graphical components, we use a relational database to store the graphical component flow structure and topology by creating a two-dimensional table. And use the SQL query language to perform various operations on the database, which makes the grid database simple and clear, reducing the amount of storage. Taking the generator as an example, when querying the first generator component, the following statement is required: (db is a defined database) 4 Automatic generation of topology In the intelligent system research of the power system, the grid topology representation is people. A problem that has always been a concern, its quality is directly related to the ease of implementation of the entire intelligent system, the scalability of the system * maintainability and the efficiency of the reasoning process. A good grid topology should allow the grid topology information to be stored intact and accessed flexibly.

The system realizes that the components can be automatically numbered according to the connection relationship between components and components after the drawing is completed, and the topology is automatically formed. In the network wiring diagram, we can see that the busbar is both the input point of current current and the current trend. The remittance point, so we regard the network diagram as a multi-system consisting of busbars. In the case of adjacency list representation, the busbar is used as the electrical connection point in the network, that is, the node model of the grid is converted into a busbar model. This facilitates the automatic numbering and querying of components. In the process of searching for components, we combine depth-first search and breadth-first search, with depth-first search as the main method. In the program, we implement the component number by judging whether the endpoint of the numbered component falls within the range of an unnumbered component.

Before designing this topology search, we roughly divided the components into three categories: components with a node number: transformers used, busbars, capacitors, cable arresters, ground wires, PT generators (12-node same number); with two node numbers Components: switch, knife gate, arc suppression coil, hand brake, ct (12 nodes different number); components with multiple node numbers: two-volume transformer, three-volume transformer.

When numbering components, first number all the busbars, then perform a first layer width search for each busbar. As shown, perform a width search on busbar 1 to obtain components (J, C, H), and perform busbar 2 The width search obtains the components (P, Q, U), and the other bus bars are deduced by analogy. Then, the depth search is started with these components as the starting point. The search termination condition is that the search for another bus is as long as the P component is connected to the bus 2 Then, the search for the first bus 1 is finished, and the search for the second bus 2 is started, and so on. Each component is not repeated after the number is completed. After the component number is completed, it is easy to store the topological relationships between components in the form of a table according to the depth search method, which lays a foundation for future graphics analysis.

5 Automatic generation of tidal current structure The tidal current structure of the system is established on the basis of the formation of topological structure. The biggest difference between it and the topological structure is that the topological structure is formed by connecting components to form the component number, and the tidal current structure is based on the power supply path. The tidal structure of the object query is established, and all possible directions of the system power supply are analyzed.

The formation of the tidal current structure is basically similar to the formation of the topological structure, and is also carried out according to the depth search method. However, the tidal current structure involves the actual direction of the current, so it is necessary to distinguish the nature of the busbar switch and the switch, that is, whether the main busbar or the bypass busbar is distinguished. Whether it is a busbar side switch or a line side switch, so before the start of the main program, the properties of the busbar switch are specified. For example, the 110 kV main busbar property number is set to 1, and the 110 kV bypass busbar is set. The definition of the nature number of 6,35 kV is defined as 23, 6 kV is 45, and so on. The definition of switch and knife gate is more complicated. For example, the outlet switch is defined as 1 line switch is defined as 2 line cutter gate line side is defined as -1 bus line side -2 outlet line knife gate line side definition 1 bus line side is defined as 2 in the power flow query Before connecting the connection number of the connection and ct, the node number of the relevant component is correspondingly reduced. This is because the two components have no effect on the development of the whole current, and they are independent of whether the line is charged or not. When querying the trend, starting from the beginning of the trend or the generator (if there is no generator in the power plant, only the generator) starts from the starting point of the trend. The query rules are as follows: 1) Query to the bus Whether the j-break bus is the same voltage level as the incoming line, so as to determine whether it is the power-side bus, if yes, continue to query the component connected to the bus until the query component ends; if the bus and the incoming voltage level are different, then the bus It is the load side busbar, so that the switch connected to the busbar, the knife gate, the handcart switch, the handcart knife gate and the p and capacitor of the next stage are found down. In fact, the load side busbar can be found as the power flow inquiry. At the end, querying the connected component down is an additional job.

2) Since this query does not involve whether the query component is the outlet or the incoming component, after the first query is finished, if the busbar on the incoming side is connected to the busbar on the power supply side, the incoming line may be queried as an outgoing line. Therefore, it is necessary to remove the situation where the incoming line is used as the line query. The flow structure table serial number is connected to the type voltage level node 1 node 2 nature charged state road gate closed gate line off line knife open knife mother open 3511 incoming line 3512 line knife gate 3523 incoming line Switch 3534 busbar switch 3544 incoming busbar 1090 main change switch electric and electric. Electricity.

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The trend structure query is in the program by taking the serial number of the component as the connected number. As the trend continues to deepen, the component number in the string list of the connected number is continuously added, such as the component 16 (switch) in the power flow structure. The connection number is the sequence number of all components that the tidal current flows to. The application of the system and its prospects. The graphics system has been successfully applied to the adaptive switching operation system of Dagang Hydropower Plant. The graphics in the operation ticket system. On one hand, the system provides the network diagram of the entire substation. On the other hand, it also provides the operation parameters of the operation ticket system, such as the component parameters and the power supply, power failure range, etc., such as finding the influence range in the operation ticket system is the component in the power failure range. Take out separately, remove all components with the connected number of these components from the current structure table and include them in the new table. Take the component 10 as an example. The components with the connection number 3115-10 or 3226-10 are within the influence range. Components. It can be seen that the graphic system lays a solid foundation for the intelligent operation of the ticket system. In addition, the graphics system can be applied to power flow calculation and short circuit calculation. In short, it is the basis and tool for computer visual analysis of power system. 7 Conclusion The design of the system is basically simple and easy to operate, and is closely connected with the database. The most important thing is that the system breaks the traditional manual analysis of the grid topology. The manual input situation can automatically form the network topology structure, automatically number the network nodes, strengthen the intelligence of the power grid analysis, reduce the workload of the user, and use the effect in engineering applications.

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