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Design of electrical power supply of city Jičín
Vánský, Pavel ; Kopička, Marek (referee) ; Toman, Petr (advisor)
The thesis deals with the issue of voltage changes or changes in the supply of electric energy of the particular town. The work entitled "Design of electrical power supply of city Jičín" addresses the specific case of unification of the town of Jičín. The first part describes the current state of distribution equipment, including calculations of short-circuit conditions, cross sections, a description of the sites of electricity consumption and the power consumption of the town. From the detailed description of the current state it is clear that most of the equipment is beyond its mean time to breakdown and has been in operation longer than intended. The next chapters describe possible solutions to reconstruction of the facilities. The first option – marked as option A – aims to maintain the existing 10kV distribution lines. Option B presents a solution in the form of abolition of urban transformation and transition to the 35kV voltage level (which is the voltage level used in the CEZ Distribution plc, eastern area). A comparison of proposed options is made in the technical-economic evaluation. The evaluation brings a detailed description of progress of implementation and planning of the reconstruction of facility particular parts for individual years. The conclusion summarizes the results of the technical-economic assessment of both options and gives reasons why option B, which proposes transition to the 35kV voltage level, is more advantageous.
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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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Design of electrical power supply of city Jičín
Vánský, Pavel ; Kopička, Marek (referee) ; Toman, Petr (advisor)
The thesis deals with the issue of voltage changes or changes in the supply of electric energy of the particular town. The work entitled "Design of electrical power supply of city Jičín" addresses the specific case of unification of the town of Jičín. The first part describes the current state of distribution equipment, including calculations of short-circuit conditions, cross sections, a description of the sites of electricity consumption and the power consumption of the town. From the detailed description of the current state it is clear that most of the equipment is beyond its mean time to breakdown and has been in operation longer than intended. The next chapters describe possible solutions to reconstruction of the facilities. The first option – marked as option A – aims to maintain the existing 10kV distribution lines. Option B presents a solution in the form of abolition of urban transformation and transition to the 35kV voltage level (which is the voltage level used in the CEZ Distribution plc, eastern area). A comparison of proposed options is made in the technical-economic evaluation. The evaluation brings a detailed description of progress of implementation and planning of the reconstruction of facility particular parts for individual years. The conclusion summarizes the results of the technical-economic assessment of both options and gives reasons why option B, which proposes transition to the 35kV voltage level, is more advantageous.
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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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