Research On Method Of Graphics Exchange And Application For Power Grid Dispatching Center

Automation systems are now changing the way of production and common life with the development of information technology.Power system, as a large complex real-time system, has unseparated relation with power automation system for its reliable operation. In response to the State Grid's call to build a strong smart grid, dispatching center start to migrate applications to a safer platform which is based on China's domestic operating system. While much of the application data is only required within a certain platform, it needs to exchange data both internally between different applications and externally with other platforms. However, the extraction, matching, reorganization and use of graphics is quite a hard work to due with. To ensure the avaiablily of power system graphics in the process of application update, it is of great significance to study on the method of graphics exchange for power grid dispatching center.To begin with, this paper introduces some related standard for power system data exchange. The International Electrotechnical Commission(IEC) formulated IEC61970 standard with the core content Common Information Model(CIM); China proposed CIM/E language for modeling and CIM/G language for graphics to fit the partical requirements. On the aspect of graphics exchange, the American Electric Power Research Institute(EPRI) recommends two schemes: graphic centric approach and domain centric approach. This paper focuses on the EPRI graphic centric approach and takes an in-depth study on some key issues in the process of cross-platform application graphics exchange.The graphics of power system dispatching center has some shorts for exchange. Large quantity with small size, means the graphic files are scattered, and the file structure is rather complex. The minimum usable graphics collection pick-up algorithm can help to filter out a large number of unrelated files. The sequence-tag sharing model which is derived from the methods of Hadoop to handle small files, can further optimize the massive small files problem and organize the file hierarchy. Two analytical methods of this model are introduced in this paper to fit different use case.The homology connection between CIM/G language and Scalable Vector Graphics(SVG) makes it possible for graphics import from source to the target data center. Converted graphical system needs data model to link background database. This paper gives the general law to convert the power system graphics of the dispatching center, and proposed a matching algorithm to ensure the data link works.At the end of this paper, the upgrade of online-verify system is presented as a sample. It shows the idea to design the framework of the application to integrate with the domestic security operating system. The sharing model and conversion methods of this paper are used in this part, new version of online-verify system has been applied in pratical power system and it provides a reliable guarantee for power grid operation.