Composition and Application of Power System Digital Twins Based on Ontological Modeling The approach to create power system digital twins is presented by the example of energy supply of a geographically localized Ru0026D facility. In this paper, the sixlayer digital twin architecture is proposed and its prototype software implementation is described. The architecture consists of an ontological model, a digital single line diagram, electronic documentation, master data, load measurement data, and mathematical models and simulations. The paper describes problems and principles of ontological modeling of the prosumer infrastructure, including customer load, lowvoltage distribution network sections, smallscale generation equipment, and electric energy storage devices. The optimal configuration of the hybrid power supply system with renewable energy sources was computed using the digital twin that was composed according to the presented approach. For machinereadable representation of the digital twin, the ontological modeling language OWL is used.

Analysis of the Publications on OntologyBased Smart Grid Applications: A Birdxe2x80x99s Eye View Smart grid ontology is a field of research recently viewed from the field of smart grid research as well as from the field of ontology research. The integration between smart grid and ontology is expected to enable the sharing of ontology among applications and stakeholders. By using the same language, the common problems that occur during applications interoperability will be prevented and solved. This brief paper intended to help researchers get an overview of the current smart grid ontology research in the world and also to know the connection between smart grid ontology paper publications with research attention leading to smart grid ontology. To do so, we conduct a comprehensive survey on three databases which are IEEE Xplore, Springer, and Elsevier ScienceDirect. From the survey, we obtained the number of smart grid ontology research studies, their citations, and the country. From the number of papers and their citations, it can be known which country has an interest in smart grid ontology research. From the results of this review, it was found that countries in continental Europe are the most widely issued publication about smart grid ontology. Similarly, the papers that cite largely dominated by countries in continental Europe.