Application Study On Object Linking And Embedding For Process Control In Electric Power Supervisory Control

In electric power system, the supervisory control system need communicate to various equipment for measure and control, which has respective communication protocol, so the supervisory control software need package all the communication protocols. In power plant, each special subsystem has respective supervisory control system, which developed by different companies, and don't communicate each other, consequently, some informational islands come into being. The openness and interoperability of supervisory control for electric power system must be settled urgently.The standard of OPC (OLE for Process Control) was issued by OPC foundation. OPC is a universal technical standard, which provides a standard mechanism for communicating to numerous date sources in industrial control network, accordingly, OPC is widely applied in the field of industrial control. If the OPC is applied in the supervisory control for electric power system, the reusable and transplantable will be advanced, development time will be reduced, stability and reliability will be enhanced, the openness and interoperability will be really realized. This dissertation concentrates on the following work:(1) Grasp the program thinking base on COM and the program method, on the basis of investigation on OPC DA( OPC Data Access) standard, include the object model, logical relation, the mechanism for communication.(2) Put forward the program frame of OPC DA server base on the comprehension of OPC standard.(3) Program the OPC DA server aims at MPI protocol of Siemens S7-300/400 PLC, and tests the server by King View 6.5 and WinCC 5.2.(4)On the basic of realizing the OPC DA server, the application and prospect of OPC are discussed effectively in this dissertation. Put forward the scheme to integrate the OPC DA server with supervisory control for electric power system.