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Abstract. In this paper a microgrid composed of a diesel generator and two uninterruptible power supply systems with separate battery banks is introduced. The microgrid located in three academic buildings of Tallinn University of Technology. A three-level control and monitoring system for the microgrid based on the EtherNet/IP communication network is developed. In addition, a control strategy of the microgrid in the gridconnected and stand-alone mode of operation is proposed.

The problem of electric drive design concerns the multi-criteria and non-linear problems having a number of more or less right solutions. In daily practice the search of optimum solution bases a great deal on the designer intuition and experience. Therefore, multiple obtained results have a waste degree of equipment use, unwarranted complexity, or excessive cost. Proposed approach is based on the implementation of the Structured Query Language (SQL) into the design and modelling stages concerned the work with databases of the drive components. Examples of effective algorithms are given to choose an optimum ratio of electrical and mechanical components. The soft tool is developed to generate and edit SQL sentences, to extract information from databases, as well as to test different component sets for particular applications.

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This paper proposes a six-dimensional (6D) space framework and an appropriate reference entity for the description of organizations and realization of identifiable matter. The aim was to compose and present a new differentiable and well-structured syntactic reference entity on the basis of a general 4D space-time system. The entity should be visual, capable of providing people who develop, integrate or analyse distributed motional applications with basic means for navigation and adequate comprehension of motion. The common length, width and height dimensions determine the 3D subspace for definition of the geographic points of the motional concept. Time and the newlyfounded content and merit dimensions together form a 3D realization space that inherently describes existence of motion outside the geographic points. The content dimension is used to declare the quantitative values of the quantities and properties of motion. The merit dimension is used to declare the qualities of quantities and properties. The transformation in the dynamic realization space is defined by the named quantities and properties. The time dimension is used to define the dynamic channels for the valuable content of a named quantity or a property of motion. The temporal content values of the named quantities and properties of matter are defined at the geographic points. Symbolic names of the axes of the new 6D axis system are: length, width, height, time, and the newly introduced content and merit. An ontology is proposed by the author to define the hierarchy of the merital names. The content axis uses the basic hierarchy with Arabic numerals to define the quantitative values of the quantities (properties). The 6D axis system that is semantically interpreted as a syntactic reference item is universally usable to describe the motion of a distributed concept, a model or a real entity, including transformation between different qualities of motion. Potential usage of the new 6D axis system together with the ontology is described. An example in the field of electrical engineering and industrial automation technology is presented. A visual user interface is discussed.