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Hure N.,University of Zagreb | Turnar R.,University of Zagreb | Vasak M.,University of Zagreb | Bencic G.,Electrical Traction Engineering Inc.
Proceedings of the IEEE International Conference on Industrial Technology | Year: 2015

This paper is focused on design of a wind turbine optimal yaw control system based on very short-term wind predictions. The optimal controller performance is evaluated with respect to the power production maximisation and structural loads minimisation goals that are joined together in a single performance function expressing the profit of the wind turbine control system operation. Designed optimal yaw controller performance is compared to the baseline controller in the professional aeroelastic simulator GH Bladed. The results show effectiveness of the developed optimal wind turbine yaw angle controller, since it demonstrated damage equivalent loads reduction and power production increase. © 2015 IEEE. Source

Sundrica M.,Electrical Traction Engineering Inc.
IEEE EuroCon 2013 | Year: 2013

In this paper, a new control method for synchronous motor with excitation and damper windings is presented. It is based on one type of nonlinear control; feedback linearization control. To make a realization in the sense of electric drive, symmetrical space vector PWM is applied. Estimation of damper winding currents via Lyapunov function for the whole estimated system is done. The aim of control is to make tracking system for rotor speed and square of stator flux. Simulation of motor starting to predefined operating points is done, and also maintaining these points during step change of load torque is obtained. Simulations give good results. © 2013 IEEE. Source

Sucic S.,Electrical Traction Engineering Inc. | Rohjans S.,OFFIS Institute for Information Technology | Mahnke W.,ABB
IEEE EuroCon 2013 | Year: 2013

Large scale dissemination of power grid entities such as distributed energy resources (DERs), electric vehicles (EVs), and smart meters has provided diverse challenges for Smart Grid automation. Novel control models such as virtual power plants (VPPs), microgrids, and smart houses introduce a new set of automation and integration demands that surpass capabilities of currently deployed solutions. Therefore, there is a strong need for finding an alternative technical approach, which can resolve identified issues and fulfill automation prerequisites implied by the Smart Grid vision. This paper presents a novel standards-compliant solution for accelerated Smart Grid integration and automation based on semantic services. Accordingly, two most influential industrial automation standards, IEC 61850 and OPC Unified Architecture (OPC UA) have been extensively analyzed in order to provide a value-added service-oriented integration framework for the Smart Grid. © 2013 IEEE. Source

Martinic A.,Electrical Traction Engineering Inc.
Proceedings of the International Conference on Information Technology Interfaces, ITI | Year: 2012

Virtual teams are increasingly engaged in globalized business environments. Virtual teams work across space, time and organizational boundaries with links ensured by information and communication technologies. Communication, collaboration, and knowledge exchange are the most important in virtual teams' operations and their efficiency directly influences teams' performance. In this paper benefits and challenges of virtual teams are described, and description of software tools used by virtual teams is given. Previous efforts to provide efficient communication, collaboration, and management tools and frameworks for virtual teams are summarized. Some promising research directions are indicated. Finally, integrated framework for virtual team management is proposed. © 2012 SRCE UNIV. Source

Sucic S.,Electrical Traction Engineering Inc. | Havelka J.G.,University of Zagreb | Dragicevic T.,University of Zagreb
International Journal of Electrical Power and Energy Systems | Year: 2014

Dynamic and adaptable integration of Distributed Energy Resources (DERs) into novel power system assets, such as microgrids, is one of the key prerequisites for accelerated Smart Grid deployment. By using standardized network interfaces and semantic descriptions for remotely controllable DERs, it is possible to develop intelligent microgrid applications capable of dealing with dynamic loads and intermittent DER power production. IEC 61850 standard has been accepted as one of the prime movers of successful and interoperable Smart Grid communication and integration. Although primarily being applied to the substation automation, IEC 61850 now provides semantic definitions for DER devices allowing it to be applied to expert microgrid application development. The current IEC 61850 middleware definition cannot cope with certain Smart Grid requirements such as support for autonomous microgrid applications with DER plug-and-play capability. These issues could be solved by integrating the device-level Service Oriented Architecture (SOA) paradigm into IEC 61850 applications. Developing a device-level SOA middleware platform based on IEC 61850 principles could significantly facilitate standards-compliant DER integration and accelerate microgrid deployment. A new middleware platform for microgrid applications is proposed. It is based on integrating device-level SOA design principles into IEC 61850 applications in order to fulfil dynamic microgrid management requirements. © 2013 Elsevier Ltd. All rights reserved. Source

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