The research work analyzes the options for the use of smart meters in low-voltage electricity network control. Analysis of state of the art and existing equipment has been performed. Furthermore, technological and economical evaluation of suggested solution have been conducted on three real distribution networks with distributed generation. The results show that the research project results implementation in low-voltage distribution network is possible, allowing the power flow loss minimization while being economically justified.
F.10 Improvements to an existing technological process or technology
COBISS.SI-ID: 18346262The principal investigator and members of the project team have cooperated in the programme and the organising committee of the 23rd International Expert Meeting Komunalna energetika / Power Engineering. Its main topic in discussion was the »Integration of smart buildings, grids and cities – with energy as the interconnecting link«. The aim of the meeting was the establishment of an integral and interdisciplinary overview on the construction of smart buildings and smart grids as well as smart cities, based on the collaboration of experts from the fields of electrical, civil, chemical and mechanical engineering. 4 of the presented works are directly connected with activities of the applied research project. ORGANISING COMMITTEE Chairman: Jože PIHLER Faculty of Electrical Eng. and Computer Science, Maribor Secretary: Jurček VOH Faculty of Electrical Eng. and Computer Science, Maribor Members: Katarina DEŽAN Faculty of Electrical Eng. and Computer Science, Maribor Lidija K. KORITNIK ICEM – TC, Maribor Vlasta KRMELJ Energy Agency of Podravje, Maribor Tine MARČIČ TECES, Maribor Gorazd ŠTUMBERGER Faculty of Electrical Eng. And Computer Science, Maribor Jože VORŠIČ Faculty of Electrical Eng. and Computer Science, Maribor
B.01 Organiser of a scientific meeting
COBISS.SI-ID: 78276865The doctoral thesis deals with the analysis of conditions that appear in a resonant earthed medium voltage distribution system in the cases of earth faults. The measurements and experiments performed in a real operating network are used to show the problems caused by specific arc faults that occur when the conductor touches branches or trees, when the conductor falls to the ground during operation and in the cases of medium voltage cable insulation failure. The resonant earthed neutral enables complete compensation of the capacitive component of the earth fault current, whilst it fails to compensate the active component. The active component of the earth fault current results from losses due to inadequate insulation of the network and losses in the Petersen coil. Similarly, also the higher order harmonic components of the earth fault current, caused by nonlinear loads in the distribution network, cannot be compensated with resonant earthing. The thesis shows that in the case of arcing faults even a perfect compensation of the capacitive component in the earth fault current is insufficient to effectively extinguish arc at the fault location. The arc is continuously maintained by the active component in the earth fault current due to the losses and higher order harmonic components. The core of the thesis is the implementation of the fault current path control method in a resonant earthed system, where an earthing switch is employed to earth the medium voltage busbar of the faulted phase. In this way, the arc at the fault location is immediately and effectively extinguished in all cases of earth faults. The most significant contribution of the proposed fault current path control method is to provide a continuous operation in the cases of not self-extinguishing arcing faults, safe location of faults and their elimination, all without supply interruptions. The implementation of the proposed fault current path control method directly affects the power supply quality. In this thesis, the proposed fault current path control method is dealt with analytically using equivalent circuits, phasors and impedances, as well as numerically using dynamic network analysis. The theoretically obtained results are completely confirmed by an extensive filed-testing, performed in the transformer substation Krško under conditions of normal distribution network operation. A special effort has been made to design, develop and manufacture special equipment, indispensable to perform experiments in an operating medium voltage distribution network in the safe manner.
D.09 Tutoring for postgraduate students
COBISS.SI-ID: 18162710