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Steady state and short-circuit conditions in 110kV E.ON network fed from Sokolnice transformer station
Vyčítal, Václav ; Rampl, Martin (referee) ; Blažek, Vladimír (advisor)
This thesis can be divided into five main parts. The first part deals with theoretical analysis of power flow calculation in power network during steady state condition. Load flow calculation is presented here as a linear and nonlinear problem. Newton iteration method is proposed for solving power flow as nonlinear problem. The second part of this thesis deals with the analysis of short-circuit calculation in accordance with valid International Standard IEC 60909. The equivalent voltage source method is adopted in case of the short-circuit calculation. For the calculation of unbalanced short-circuit currents, the symmetrical components method is also presented. The last three parts of this paper are focused on calculations of power flow and short-circuit conditions in power grid Sokolnice. So in the third part is the description of nodal area Sokolnice with its substations and the calculation of load flow and short-circuit conditions for two different power supply options. For each supply option is also considered an abnormal (fault) grid condition. (overall there are solved four different options) The fourth part of this thesis deals with the result analysis and also the results of different power supply options are compared. In the last part there are presented necessary technical improvements for fault-free operation of power grid Sokolnice based on the result of power flow and short-circuit conditions in that grid.
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The analysis of parallel operation variants of supply areas 110 kV Čebín and Sokolnice
Reiter, Martin ; Vaculík, Petr (referee) ; Toman, Petr (advisor)
The diploma thesis is focused on the analysis of parallel operation of Čebín and Sokolnice substations. Different variants of parallel operation are researched. A calculation of steady state by the iterative method is described in the theoretical part. The next part briefly mentions a short-circuit and dimensioning of conductors. The possibility of overloading of lines and transformers is discussed in the last chapter of the theoretical part. The current state of the situation is described in the practical part. Main goal of the practical part of the diploma thesis is to design a configuration capable to parallel operation. Also another configuration of supply of this area is designed. There must be no direct connection between Čebín and Sokolnice substations on 110kV level in this configuration. This configuration should eliminate a transit flow of power. Each configuration has to fulfill the requirements on the steady state and on short-circuit current capability. One of the last chapters is focused on the steps, that should by undertaken to prevent transit flow of power.
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Steady state and short-circuit conditions within E.ON 110kV power network at bridge operation of transformers T402 and T403 in 400/100kV transformer station Sokolnice
Bernát, Jan ; Rampl, Martin (referee) ; Blažek, Vladimír (advisor)
The master’s thesis deals with a calculation of steady state and short-circuit conditions in a 110 kV system during a bridge operation of transformers in a Sokolnice substation. The theoretical part of the thesis deals with a calculation of steady state of a system using Newton’s iterative method, it investigates short-circuits – their timing, distinctive values and a method of their calculation. In the practical part the 100 kV grid supplied from Sokolnice substation is described. The main goal of the thesis is a comparation of two basic wirings: bridge operation of T202 and T203 transformers (contemporarily in service) and bridge operation of T402 and T403 (in service after 2017). These two wirings were controlled even during one state of emergency during which the Sokolnice substation will be affected by an outage of one busbar. Voltage conditions, loading of power line and transformers and overall power balance were controlled. Short-circuit conditions were also calculated and short-circuit resistance of particular substations was inspected. In the conclusion technical measures needed to ensure smooth bridge operation of convertors T402 and T403.
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Design of the distribution network branch for new family and apartment houses in Újezd u Brna
Frechová, Lucie ; Novák, Vojtěch (referee) ; Ptáček, Michal (advisor)
The work mentions the concept of present electricity networks in the Czech Republic and based on voltage levels it also describes distribution networks in more detail. Furthermore it brings the analysis of legislative conditions and technical aspects, under the rules of the distribution network operation, for new customers who require new connection to electricity network. Because of the steady-state network evaluation represents very important issue of the power system calculations, therefore it is explained in theoretical part of this work. Nowadays, Gauss-Seidel method and Newton iterative method are generally used for the steady-state analysis. Mentioned ones are also described and compared together in theoretical part. Furthermore methods are applied in practical part which solves specific configuration of the network in a given area. Moreover there are the basics of the conductor sizing in terms of the warming, both during normal operation and during a short circuit. However, it is necessary to respect other aspects of the conductor sizing, therefore issues of mechanical and electrical strength, the voltage drop and the sizing economy are also shown. There is also the characteristic of proposed and the description of the individual components which are used for the network i.e. transformation station, HV and LV switchgear, transformer, HV and LV cabling. It also concludes the characteristics of the design opportunity with their power and economical comparison.
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Unsymmetrical power flow calculation with the help of software applications
Ermolenko, Ilya ; Koudelka, Jan (referee) ; Vyčítal, Václav (advisor)
This work consists of four parts. The first part of the thesis provides a theoretical introduction to the power flow calculation problem. Furthermore, the analysis of power flow calculation as a linear and as a nonlinear problem is performed. In this thesis, Newton’s iteration method is used in the calculation of the nonlinear problem. The following describes possibilities for improving the power flow calculation by improving the Newton's iteration method and using non-standard methods. The second part describes the possibilities of power flow calculation using various software applications, such as Pandapower, Matpower, OpenDSS and PSS Sincal. In the third part of the thesis the selected software applications tool is used to test the possibility of unsymmetrical power flow calculation in the LV network for the state with and without the PEN conductor, and the calculation of the ground fault in the compensated network. In the fourth part of the work, the unsymmetrical power flow calculation is tested for a larger LV network, further is performed the evaluation of the influence of PEN conductor modeling on the calculation results compared to the calculations of a network without this conductor.
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Stabilized operation and short - circuit conditions within E.ON 110 kV power network supplied from Otrokovice 110kV switching station, during the period of 2011
Jurča, Ondřej ; Rampl, Martin (referee) ; Blažek, Vladimír (advisor)
Distribution network 110 kV owned by E. ON in the area Otrokovice; powered by 110 kV and two variants of involvement contained.The first option is basic involvement, without the use of the bridge. The second option includes involvement with the bridge. The aim of this study is to compare; by calculating the steady-state network operation and short circuit conditions of the network, the involvement of these two options. The thesis is divided into two parts, theoretical and practical. The theoretical part consists of a description of the steady operation of networks of high-voltage and short circuit ratio calculations. Load flow calculations are described by the Gauss-Seidel and Newton iterative method. In the case of short-circuit conditions, the effects of their characteristic values, processes and various methods of calculation are described.In the second part, this theoretical knowledge is applied to input data and dispatching programme with the appropriate calculations of network operation and short circuit conditions. The calculated values are listed in the thesis, on the basis of which an evaluation of the two possible connections is made.
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Unsymmetrical power flow calculation with the help of software applications
Ermolenko, Ilya ; Koudelka, Jan (referee) ; Vyčítal, Václav (advisor)
This work consists of four parts. The first part of the thesis provides a theoretical introduction to the power flow calculation problem. Furthermore, the analysis of power flow calculation as a linear and as a nonlinear problem is performed. In this thesis, Newton’s iteration method is used in the calculation of the nonlinear problem. The following describes possibilities for improving the power flow calculation by improving the Newton's iteration method and using non-standard methods. The second part describes the possibilities of power flow calculation using various software applications, such as Pandapower, Matpower, OpenDSS and PSS Sincal. In the third part of the thesis the selected software applications tool is used to test the possibility of unsymmetrical power flow calculation in the LV network for the state with and without the PEN conductor, and the calculation of the ground fault in the compensated network. In the fourth part of the work, the unsymmetrical power flow calculation is tested for a larger LV network, further is performed the evaluation of the influence of PEN conductor modeling on the calculation results compared to the calculations of a network without this conductor.
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Design of the distribution network branch for new family and apartment houses in Újezd u Brna
Frechová, Lucie ; Novák, Vojtěch (referee) ; Ptáček, Michal (advisor)
The work mentions the concept of present electricity networks in the Czech Republic and based on voltage levels it also describes distribution networks in more detail. Furthermore it brings the analysis of legislative conditions and technical aspects, under the rules of the distribution network operation, for new customers who require new connection to electricity network. Because of the steady-state network evaluation represents very important issue of the power system calculations, therefore it is explained in theoretical part of this work. Nowadays, Gauss-Seidel method and Newton iterative method are generally used for the steady-state analysis. Mentioned ones are also described and compared together in theoretical part. Furthermore methods are applied in practical part which solves specific configuration of the network in a given area. Moreover there are the basics of the conductor sizing in terms of the warming, both during normal operation and during a short circuit. However, it is necessary to respect other aspects of the conductor sizing, therefore issues of mechanical and electrical strength, the voltage drop and the sizing economy are also shown. There is also the characteristic of proposed and the description of the individual components which are used for the network i.e. transformation station, HV and LV switchgear, transformer, HV and LV cabling. It also concludes the characteristics of the design opportunity with their power and economical comparison.
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The analysis of parallel operation variants of supply areas 110 kV Čebín and Sokolnice
Reiter, Martin ; Vaculík, Petr (referee) ; Toman, Petr (advisor)
The diploma thesis is focused on the analysis of parallel operation of Čebín and Sokolnice substations. Different variants of parallel operation are researched. A calculation of steady state by the iterative method is described in the theoretical part. The next part briefly mentions a short-circuit and dimensioning of conductors. The possibility of overloading of lines and transformers is discussed in the last chapter of the theoretical part. The current state of the situation is described in the practical part. Main goal of the practical part of the diploma thesis is to design a configuration capable to parallel operation. Also another configuration of supply of this area is designed. There must be no direct connection between Čebín and Sokolnice substations on 110kV level in this configuration. This configuration should eliminate a transit flow of power. Each configuration has to fulfill the requirements on the steady state and on short-circuit current capability. One of the last chapters is focused on the steps, that should by undertaken to prevent transit flow of power.
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