APPLICATION OF DATABASE ACCESS MIDDLEWARE TECHNOLOGY IN SCADA DATABASE SYSTEM
Sun Wan-sheng · Power System Technology · 2005
The principle and classification of middleware technology are presented. On the basis of both component technology and extensible markup language (XML) technology the middleware technology for database access and its method of application are researched. Applying the database access middleware to the design of the three-layer model for the database system of SCADA and utilizing the database access middleware, the database server of SCADA is connected with foreground application program of clients. The data structure and the design of middleware interface adhere to IEC61970 standard; by means of updating the module of middleware the database system can be expanded and upgraded, thus the database system possesses good compatibility and extendibility. In addition, a kind of database system of SCADA based on middleware workstation is designed, the designed system can fully utilize the resources of existing SCADA and share heterogeneous data, so the efficiency of database system can be improved. It is available to use the designed database system in new generation of dispatching automation system.