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Short - circuit conditions at Sokolnice 110 kV switching station following a direct 400/110 kV transformation
Hajdú, Lukáš ; Paar, Martin (referee) ; Blažek, Vladimír (advisor)
The goal of this bachelor´s thesis is to evaluate short-circuit conditions at the Sokolnice 110kV switching station before and after installation of a T402 transformer – before and after application of a direct 400/110kV transformation. By evaluating these conditions determine whether the originally installed protective elements (power circuit-breakers) are capable of fulfilling the new short-circuit requirements at the switching station. The thesis consists of two parts: the first part introduces the theory required to evaluate the short-circuit conditions at the switching station, while the second part calculates the actual short-circuit currents and power outputs. The methods used for calculation are sequential simplification and symmetrical components.
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The impact of distributed generation on 110 kV distribution system E.ON
Hajdú, Lukáš ; Vaculík, Petr (referee) ; Orságová, Jaroslava (advisor)
This Master´s thesis deals with problematics related to the connection of new decentralized power sources into electrical power grid. Due to advantageous legislative support of these new, especially photovoltaic power sources, a massive amount of these sources have been connected into the power grid between years 2009 and 2010. For theoretical understanding of processes during a steady-state, the initial parts of this paper are focused on a procedure which solves steady-state on every power line mentioned. When we speak of decentralized power sources connection, it is necessary to mention the connected legislative. National distribution grid operators in collaboration with national regulatory commission have decided on a legislative document Rules of distribution grid operation, which puts a set of demands and requirements on applicants wishing to connect a new power source to the grid. The text of this thesis is focused mainly on demands required after the latest change in 1/2010. Practical part of this work deals with verification of new power source influence on a related power grid and meeting the legislatively required demands. The most important demands are voltage change due to new power source operation and its transfer to other voltage levels, higher harmonics injection, power output fluctuation and last, not least, changes in load flow directions. For reasons previously mentioned an analysis is made and possibilities of reducing or removing of these influences are introduced. To achieve these goals, two computer programs, Siemens Sinaut Spectrum and NetCalc are used.
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Short - circuit conditions at Sokolnice 110 kV switching station following a direct 400/110 kV transformation
Hajdú, Lukáš ; Paar, Martin (referee) ; Blažek, Vladimír (advisor)
The goal of this bachelor´s thesis is to evaluate short-circuit conditions at the Sokolnice 110kV switching station before and after installation of a T402 transformer – before and after application of a direct 400/110kV transformation. By evaluating these conditions determine whether the originally installed protective elements (power circuit-breakers) are capable of fulfilling the new short-circuit requirements at the switching station. The thesis consists of two parts: the first part introduces the theory required to evaluate the short-circuit conditions at the switching station, while the second part calculates the actual short-circuit currents and power outputs. The methods used for calculation are sequential simplification and symmetrical components.
|
|
|
The impact of distributed generation on 110 kV distribution system E.ON
Hajdú, Lukáš ; Vaculík, Petr (referee) ; Orságová, Jaroslava (advisor)
This Master´s thesis deals with problematics related to the connection of new decentralized power sources into electrical power grid. Due to advantageous legislative support of these new, especially photovoltaic power sources, a massive amount of these sources have been connected into the power grid between years 2009 and 2010. For theoretical understanding of processes during a steady-state, the initial parts of this paper are focused on a procedure which solves steady-state on every power line mentioned. When we speak of decentralized power sources connection, it is necessary to mention the connected legislative. National distribution grid operators in collaboration with national regulatory commission have decided on a legislative document Rules of distribution grid operation, which puts a set of demands and requirements on applicants wishing to connect a new power source to the grid. The text of this thesis is focused mainly on demands required after the latest change in 1/2010. Practical part of this work deals with verification of new power source influence on a related power grid and meeting the legislatively required demands. The most important demands are voltage change due to new power source operation and its transfer to other voltage levels, higher harmonics injection, power output fluctuation and last, not least, changes in load flow directions. For reasons previously mentioned an analysis is made and possibilities of reducing or removing of these influences are introduced. To achieve these goals, two computer programs, Siemens Sinaut Spectrum and NetCalc are used.
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