Study On The Theory And Method Of Heterogeneous Information Sharing And Interoperation In Power System

Along with the rapid development of society and economy and the interconnection of power systems, the security and stability of power systems is becoming more and more important. Nowadays, various software and hardware systems is playing important role in power systems, and the requirement of exchange common information among those software and hardware systems is also getting more and more urgent. However, the heterogeneity of those application systems seriously impedes the information sharing and interoperation. Hence, the research on the theory of heterogeneous information interoperation to build an opening software platform in power systems is of great theoretical and impractical significance. This dissertation concentrates on studying several key problems in this field, including the formal representation of CM and power system graphics information interoperation. The method to design and develop some application systems of power systems based on those researches are also study in this dissertation.The IEC 61970 standard is constituted by the International Electrothecnical Commission with the aim to realize the "plug and play" and information sharing of EMS applications. Firstly, the method of establishing the common information model and the component interface specification in IEC 61970 is introduced. Secondly, the interoperability of CIM in IEC 61970 is investigated based on the formal semantic theory, and the extension of RDF (Resource Description Framework) schema and simplification of RDF syntax in IEC 61970 with which to realize the formal expression of CIM are introduced. Finally, the disadvantage that RDF is difficult to describe the semantic information of the CIM model is presented. Thus, the method of realizing the semantic formalized expression of CIM and building IEC 61970 semantic information model by ontology is put forward, which can solve the problem of RDF, provide logic inference function and help reach the consistent semantic comprehension of the information model of power systems.In the aspect of the graphics information sharing and interoperation of power systems, based on the comparison of the two graphics exchange approaches proposed by CCAPI, it is found that the graphics centric approach excels the domain centric approach. Because the graphics centric approach could provide easier support for multiple graphics display on each domain object in power systems; simpler use of standard SVG viewers; and easier support for "background" data in diagrams. Several key problems of CCAPI graphics centric approach are presented. Then, the methods of how to build the exchange graphics information in a standard form with IEC 61968 location package and SVG metadata model and how to realize the graphics exchange based on those information are introduced. Finally, an ontology method to establish contact between the graphics element and the CM objects in CCAPI graphics centric exchange approach is presented. The graphics element and electrical model can be associated together by building application ontology in each heterogeneous application. Meanwhile, by enhancing the horizontal association and semantic restriction of electrical model using application ontology, the graphic information sharing and interoperation can be changed into the identification and mapping between application ontologies and the graphics information sharing can be realized efficiently.Finally, examples of the relay settings verification system and the setting list management system are presented to explain the application of semantic information model and component technology in the development of power system software. The information exchange between the setting list management system and the relay coordination system can be realized based on the ActiveX scripting technology and Excel electronic list. Furthermore, with the workflow technique, the auto control in the setting list's management business process between multi-user and multi-department in the local power area network is realized. In the relay settings verification system, the parallel calculation technology is adopted to enhance the calculation ability based on the support of CORBA. The semantic information model based on CIM and protection LN in IEC 61850 are introduced to improve the opening and information sharing capability of relay settings verification system. Both of the above-mentioned software has been applied in practical power systems and achieved favorable performance.