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The Image of Czech Beer Culture in the Media during Years 2016 and 2017
Otta, Marek ; Podzimek, Jan (advisor) ; Jirák, Jan (referee)
This thesis examines the media content of selected printed beer advertisements in the Czech Republic during the years 2016 and 2017. The thesis analyzes these advertisements by using multimodal semiotic analysis, particularly in terms of the three most essential modes - mode of image, mode of writing and layout. The theoretical part of the thesis mostly focuses on the theory of social semiotics and the theory of modes and multimodality, which is based on social semiotics. These theories provide the basics for the practical part of the thesis, in which there is used the method of multimodal analysis. Selected ads are subjected to a detailed analysis of semiotic modes that are consequently compared and evaluated. The thesis also concentrates on the most common themes and stereotypes related to the image of Czech beer culture in the media, which are obtained from the multimodal analysis. At the same time, the work focuses on the socio-cultural context in which the commercials take place, or on the issue of representation of men and women in these advertisements. The aim of the thesis is to bring together an overall media image of the beer culture in the Czech Republic, based on the common themes and signs that define beer advertisements in this period.
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Analysis of Frequency Measurement and RoCoF in Simulation Programs
Koudelka, Jan ; Máslo, Karel (referee) ; Orságová, Jaroslava (advisor)
The thesis deals with the issue of measurement of frequency and its derivative (RoCoF) in simulation software. The aim of the thesis was to compare results obtained in three different pieces of software (PSS/E, PSCAD, MODES). 2 disturbances were simulated in a grid model IEEE 39 bus system and values of frequency and generator speed were assessed. The results obtained in different software are diverse. This is influenced by method of modelling of synchronous generator and algorithm of calculation of frequency. Findings are important for future investigation of power system transients in simulation software and also point to potencial incorrect assassement of frequency in protective relays.
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Grid Node Operation after Large Nuclear Unit Connection to the Grid
Prokop, Ondřej ; Varmuža, Jan (referee) ; Katovský, Karel (advisor)
The thesis deals with the analysis of the grid node operation after the connection the nuclear unit. The aim of the master´s thesis is to describe the influence of network´s faults to a nuclear unit. Thesis is dealing with three fundamental problems. An influence of short circuits and power imbalance on the synchronous generator of nuclear power plant and its operation of the island network. The thesis is focused especially on the nuclear unit. However, in the case of any failure in the network, it´s necessary to check other units and their protections in the test system because unit failure could cause the disintegration of the power network. For the purposes of the simulation a test system of the power network has been developed. The test system was optimized in the LUG software, which is used to calculate the power network. Transient simulations are performed in the MODES software. Single faults are configured with scenarios. Results are generated into output files. Analysis of influence network´s faults on the synchronous generator of nuclear power plants. The ability of the synchronous generator to restore the primary steady state or hold the new steady state during changes in operating parameters of the network is one of the important parts of the safe and reliable operation of the power network. During the short circuit the damped transient actions occur. With the extension of the short circuit duration, the amplitude of the transient action increases. The risk of the stability loss of a synchronous generator increases. Therefore, the critical clearing time of a short circuit is being defined, which is the time when there is not any loss of stability. Critical clearing time of research generator is sufficient to turn off the short circuit with the help of its protection (the worst case is 0,8 s). For example, by comparison with the hydroelectric power plant, the critical clearing time is much longer. Models of other power plants have been designed with high reliability so in the case of these faults, it doesn’t cause the disintegration of the power network. Creation of island grid is characterized by strong current surges. Units must be resistant to these surges. In the island grid fast changes of the electrical parameters often occurs. Therefore, units must respond to these changes as quickly as possible and in the broadest limits. For this purpose an island operation regulator is being used. In the case of surplus island grid in steam power plants a dump condenser can be used. This is an important ability of steam power plants because the units are able to react quickly to changes of electrical parameters in island grid. The main result of this thesis is the behavior of the nuclear power plant during various faults in the power network. Researched generator of the nuclear power plant is highly stable against faults in the power network based on the findings. The results allow to continue in this topic with real network and real unit of nuclear power plant.
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