An Evolutive and Multilingual CIM Ontology Management System

Abstract

CIM(Common Information Model) descrybed by IEC 61970/61968 standards is recognized as the Smart Grid ontology, while Chinese localized standards of the IEC 61970 series are published as DL/T 890 series and are widely applied to power management systems throughout China. The CIM series standards define an application program interface (API) for energy management system (EMS). One core part of the standards is IEC 61970-301, which defines the CIM base set of packages which provide a logical view of the functional aspects of an EMS. Also, there are other parts of the standards which define logical views of the parts related to EMS, such as IEC 61970-302 and IEC 61968-11. Although each part of the standards is defined as a standalone UML (Unified Modeling Language) model, a unified UML model in one UML file is maintained by IEC TC57. However, as each part of the standards and its partitive ontology model are developed by different working groups of the committee and are at different standard statuses, it is necessary to provide a continuous maintenance for the CIM ontology publicly and worldwide. Difficulties to realize the continuous CIM ontology management are caused by the present CIM model. Some typical insufficiencies of the existing CIM model are described in [1]. E.g., CIM model has a lack of version information and no version control mechanism for each entity is provided in the CIM standards so that the data integrity between ontologies of new version and old version is not guaranteed. In this paper, to achieve a continuous CIM ontology management, at first, a CIM model is transformed to the IEC 62656 model which provides a methodology to overcome the current CIM weakness. This paper will focus on the principle of transformation of CIM UML model to the IEC 62656 model. In addition the prime advantages brought about by the CIM on the IEC 62656 model such as CIM localization, customization and validation are explained. Furthermore, an evolution- mechanism integrated CIM ontology database manage- ment system via the IEC 62656 model is introduced.