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Influence of Distributed Generation on Given Area of 22 kV Distribution Network
Samuel, Tomáš ; Bráblík, Libor (referee) ; Orságová, Jaroslava (advisor)
The Thesis deals with the current problem related to the connection of dispersive sources to the distribution network. The advantageous legislative support, however, gives a rapid rise to the sources of this kind. Current pricing philosophy favours in particular the growth of photovoltaic power plants. The introduction is aimed at the dispersive sources locating so as to give a comprehensive solution and better understanding of this issue. The equipments of this kind are located in accordance with legislation in force; however, it is necessary to formulate the possibilities of placing them from the view of rational use of the area with the aim of the public weal accordance of both public and private interests. Talking about connection of the new dispersive sources to the distribution network, it is important to mention the legislation, legal directives and regulations delimitating this kind of trade. This theme is the subject of another chapter of the work. Particular attention is paid to the regulation on conditions of connection to the distribution network. When connecting the sources to the distribution network the biggest technical problem from the view of electrical engineering is undesirable influence on the quality parameters (voltage) in this network. This is in particular the voltage change after connection, then, depending on the type of source, the emission of the current harmonic, sharp voltage change, etc. Considering current rise of the dispersive sources connected to the distribution network, more and more influence will appear in quantity parameters. For this reason there will be a lot of search for the methods of preventing from the negative influence on the network. From all of the above said reasons, the work is aimed at the operation analysis of the part of the distribution network, calculation of the network qualitative parameters and searching for the methods of negative influence rectification owing to switching processes of the distribution system. So as to determine the quantitative parameters we used the E-influence programme. Final paragraphs are devoted to the changes to come not only in legislation but, in general, in the approach of the distribution system operators not only to the ways of another connection of such sources but even the regulation of the dispersive sources already connected.
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Model of the metropolitan optical network
Prudík, Jiří ; Hudcová, Lucie (referee) ; Křivák, Petr (advisor)
The purpose of this master’s thesis is foremost to provide a simple guide how to build elements of optical metropolitan area network. The basic model consists to sequence of construction, network topology, passive and active parts. The collection contains examples of alternative technology such as Wireless LAN with different frequency. The optical network construction based on optical cable, fibres, splices, trays, adapters, connectors and active parts for example a lot of media convertor models. After that there are demonstrating type of wavelength division multiplexer used in metropolitan area network – passive planar PCL splitter. One of the passive planar splitter are used to increase optical fibre channel. At the end of the collection a simplified examples of used measurements – optical time domain reflectometry and optical fibre transmission. Contains standard protocols or reflectogram. The conclusion of this thesis summarizes costs of FTTb (Fibre To The Building) model of optical metropolitan area network in Czech republic and future contribution for society.
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Srovnání účinnosti vybraných systémů hnojení na produkci a kvalitu pšenice ozimé
Horký, Jiří
The aim of this diploma thesis was to evaluate the influence of different fertilization options on the yield and quality of winter wheat grain and the profitability of its cultivation. Among the qualitative parameters, the content of nitrogenous substances, gluten and sedimentation value were monitored. The research took place in the form of a one-year semi-operational field experiment in the Jabloňov area, Vysočina. The following five fertilization variants were included in the experiment: LAV as control, urea, DASA (ammonium nitrate with ammonium sulfate), Urea stabil (urea with urease inhibitor) and ENSIN (ammonium nitrate with ammonium sulfate and nitrification inhibitor). The results show that the fertilization variants had no effect on the size of the yield. The effect of nitrification and urease inhibitors and sulfur fertilizers on grain quality parameters was also inconclusive (compared to the LAV control). A significant increase in quality parameters was noticed when comparing fertilizers with inhibitors and their equivalents without inhibitors. The ENSIN variant contained 4,3 % more nitrogenous substances and 8,3 % more gluten than the DASA variant. The Urea stabil variant contained 8,2 % more nitrogenous substances, 9,5 % more gluten and achieved a 12,2 % higher sedimentation value than the urea variant. Economically, the DASA variant turned out to be the best option. Fertilizers with inhibitors had a rather negative effect on the economics of cultivation
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Hodnocení kvalitativních parametrů rajčat v hydroponické produkci
Malečková, Radka
This master thesis focuses on hydroponic tomato production, which has been gaining on importance due to the decreasing availability of fertile soil, lack of water and the growth of global population. The aim of the presented work was to describe the effect of variety and production timing on the yield, growth and qualitative parameters. The study was performed in the commercial greenhouse of AGRO Haná a.s. located in Smržice, Czech Republic and took place between December 13, 2017 and August 10, 2018. Three varieties of the cherry type were included in the study: the main commercial ‘SWEETELLE’ variety and two trial varieties ‘BAMANO’ and ‘AXIANA’. The latter was the only one with entire fruit-bearing cincinni being harvested. The scored growth parameters included weekly growth gain, number of newly emerged leaves and leaf length, stem diameter, number of flowers, number of fruits and fruit weight. In addition, at the level of rows (each consisting of 246 plants), yield over the entire production period was recorded. Among the analysed qualitative traits were L-ascorbic acid content, dry matter content, total sugar content, refractometric dry matter content, antioxidant capacity and the content of total carotenoids. The fruit analysis was performed two times, once for the production with additional artificial lighting (April 16, 2018) and once for the growth under natural light only (June 25, 2018). In summary, qualitative differences between varieties were revealed, for example ‘AXIANA’ gave the highest yield over the entire production period and had the highest L-ascorbic acid content, while ‘BAMANO’ was the variety richest in sugars and refractometric dry matter content. In addition, the fruit quality was influenced by available radiation.
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Vliv různé intenzity odlistění révových keřů na zdravotní stav hroznů
Vachek, Ondřej
This bachelor thesis concerns with the topic of partial defoliation of grape zone as well as the influence of this operation on health condition of grapes and qualitative parameters. The theoretical part of the thesis summarizes the information about grapevine leaves, leaf area, physiology of grapevine shrub as well as the knowledge about grapes, their chemicals and development. In the text there are described the ways of defolitation, dates of this operation and also the various intensity of defoliation as well as their total influence on quality and health condition of grapes. There i salso the experiment included, in which different variants of defoliation on Merlot variety are compared and evaluated. Finally, recommendations for practical use are given and described
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The yield formation and quality of winter wheat in low-input conditions
PAVLÁTOVÁ, Kristýna
The aim of this thesis is to evaluate basic yield formation and food quality of grain in selected winter wheat varieties, depending on the intensity of cultivation. There was 5 varieties chosen for the experiment of which 3 was linear (Patras, Turandot and Rumor) and 2 varieties was hybrid (Hyfi and Hybery). Each variety was repeated three times during the experiment. The vegetation was assessed in two variations - the checking one and the one fertilized by the nitrogen. This experiment was conducted in growing season 2017/2018 on the field of Faculty of Agriculture of University of South Bohemia. The withdrawal of the vegetal material for the purpose of the following sample analysis was done right before the harvesting. The yield formation and the health condition of the vegetation was assessed in the fieldwork. The determination of qualitative parameters was made with the help of the apparatus in the laboratory of the faculty. Then, the results was marked in tables and graphics. Finally, the statistical evaluation of the obtained data. An average yield of all assessed varieties of the winter wheat was 8,52 t.ha-1 at the checking variation. On the contrary, at the nitrogen fertilized one the average yield was 8,94 t.ha-1. The evaluated varieties in the growing season 2017/2018 had the baking quality A and B. Regarding the qualitative parameters, there was found lower values of volume quantity than those that are stated in the norm for the food wheat (at least 76,0 kg.hl-1). The highest values were found at the variety Turandot fertilized by nitrogen (77,8 kg.hl-1), which met the requirements of the ČSN 4611 00-2.
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Management obsahu alkoholu ve vinici
Čermáková, Michaela
In the modern age, within healthy lifestyle there is coming trend of the consumption of low-alcohol wines. In my work I deal with the selection of suitable methods for reducing the alcohol content in the vineyard or later in winemaking. With properly chosen method the wine should show a lower alcohol content, without any impact on wine sensory quality.
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Hodnocení kvalitativních parametrů hroznů u odrůdy Ryzlink rýnský
Malčic, Kateřina
The main theme of this thesis are qualitative parameters of the grapes. There are generally described various concepts in the first part, such as ripeness, sugar content, sugars, acids, pH and assimilable nitrogen. The work is focused on a white grape variety Riesling. Samples of berries were collected weekly, imported into the laboratory and regularly measured. All collection took place from 35th to 41st week of the year from various locations in the wine region of Moravia. For the final processing of the data was used year 2013. The results were statistically processed into tables and graphs.
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