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Steady State Calculations of Model IEEE Networks
Kintr, Kryštof ; Vyčítal, Václav (referee) ; Krčál, Vít (advisor)
This bachelor thesis is focused on power-flow calculation. At first the problem is initially discussed in general. This is followed by a brief description of the mathematical methods used in the calculation, followed by an overview of the software that enables this calculation. Then, the modelling of some basic power system elements is described and selected IEEE test feeders are described in more detail. Thesis continues by a description of the OpenDSS computational program and its capabilities, including a description of the features of the related OpenDSS-G program. The principles of code writing are presented using examples from a selected test feeeders IEEE 13 and IEEE 30. It is followed by a description of automated computation, for which a script was written in MATLAB and a unified data entry format was suggested in EXCEL, which is the main contribution of the thesis. Finally, the results obtained by the automated computation of selected test feeders from OpenDSS are compared with the results from the demo codes for OpenDSS as well as from other computational programs, pandapower and GridLAB-D.
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Calculation of earth current distribution in OpenDSS
Capyk, Jan ; Koudelka, Jan (referee) ; Vyčítal, Václav (advisor)
The thesis deals with the ground current distribution in electrification systems. The first part introduces the reader to the electrical parameters of distribution system elements and options of their calculation. Various factors and environmental influences that can affect the parameters of individual network elements are described using graphics dependencies. The second part of the thesis describes the creation of a network model in the OpenDSS program, which is an integral part of the study in question used to make complex calculations for the given issue. Furthermore, this part contains created models of distribution networks at voltage levels of 110 and 0.4 kV on which individual simulations are performed, including a single-phase fault. These network models are used to observe the effects on the magnitude of current distribution through the grounding system, grounding wires and the PEN conductor, in connection with changes in the arrangement of conductors on masts, with changes in wiring, etc. Finally, the obtained simulation values are compared with theoretical assumptions and evaluated.
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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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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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