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1	Analýza toků jalového výkonu v distribuční soustavě / Load flow analyses of reactive power in distribution system Krátký, Michal January 2014 (has links) This thesis is focused on issues with transmission of reactive power though the distribution line of E.ON area. The goal is to find out where and in what rate are overflows of reactive power and to project the correctional steps to minimize this overflow. In this solution, there were used data of dispatcher measurement, which were processed by created source code in Matlab. The processing was analyzed for final conclusion. There were discovered shortages in overflow of reactive power in transfer between distribution and transmission line and in unsuitably regulated capacity power factor in Planá power plant and wrong automatic regulation of turns in 440/110kV substation Dasný. The action to minimize overflows of reactive power was projected by decompensation reactor placed in T101 and T102 transformers in substation Tábor.
2	Studie över klimatförändringars påverkan på dynamisk ledningskapacitet / Study of the impact of climate change on dynamic line rating Hahne, Linnea January 2021 (has links) The thesis aims to examine the impact of climate change on line rating and to investigate the possibility of a potential increase of capacity of an overhead line. The line rating of an overhead line determines how much current can be transmitted in the line. The weather parameters which affect the line rating are ambient temperature, solar radiation, wind speed, and wind direction. If the line rating is adapted to weather conditions, it is important to be able to predict how the weather will change in the future. Therefore, the impact of climate change on weather parameters is investigated. The ambient temperature and solar radiation are expected to change between different scenarios. However, it is unclear how wind speed and wind direction will be affected. Climate scenarios are designed that take these findings into account. The results show that wind speed has, by a large margin from other weather parameters, the largest impact on the dynamic line rating. This is followed by the wind's angle of attack to the conductor, ambient temperature, and finally solar radiation. For the designed climate scenarios, the dynamic line rating is almost the same in each case, which means that the calculated change in ambient temperature and solar radiation has no significant effect on the line rating. To further increase the capacity of the overhead line, the line could be upgraded with a conductor with a larger cross-sectional area. climate change dynamic line rating static line rating line rating ampacity overhead line distribution line transmission line conductor thermal capacity real-time monitoring klimatförändringar dynamisk ledningskapacitet statisk ledningskapacitet ledningskapacitet ampacitet luftledning distributionsnät transmissionsnät ledare termisk kapacitet realtidsmätning Elektroteknik och elektronik

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Analýza toků jalového výkonu v distribuční soustavě / Load flow analyses of reactive power in distribution system

Studie över klimatförändringars påverkan på dynamisk ledningskapacitet / Study of the impact of climate change on dynamic line rating