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Proposal of the reconstruction of the distribution network in a specific area
Novák, Vojtěch ; Mrvová, Dana (referee) ; Blažek, Vladimír (advisor)
This diploma thesis is concerned with reconstruction of distribution network in Hruba Vrbka. The diploma thesis is divided in two parts. For better understanding to this issue, the first theoretical part is shortly dedicated to the history of electrical power system, to the several types of distribution network of low voltage and high voltage and their utilization in the area, considering the reliability and the quality of delivery of the electric energy. In this thesis there is mentioned division of distribution grids according to placing of cable lines, according to voltage and according to type of grid connection. Next part of this work is dedicated to the description of overhead lines and cable lines and their characteristics. For the proper concept of the grid we should know some characteristics of the electric line’s proposal: mechanical strength, warming, voltage drop, efficiency, degree of safety and provision of delivery. In the end of the theoretical part there are described methods for calculation of grid’s steady state as a linear task and also non-linear task, elimination of the balancing node, the iterative method, the reduction of external power take-off nodes and the solution of the steady state of the network through the direct current model. The second part of the diploma thesis is concerned with the calculation of the steady state in the village Hruba Vrbka. In this part is also described the KASI program which was used for the calculation of the grid’s steady state. Firstly low voltage grid’s balance in Hruba Vrbka was found out and evaluated and then there were proposed some solutions of the reconstruction for the grid improving. The suggested options of the reconstruction are considered from technical and economical point of view and the best solution is chosen. For this solution there is suggested the protection through program SICHR 9. In the end of this diploma thesis there is checked the load of the high voltage line.
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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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Evaluation of Possibility of New Source Connection With Regard to Nodal Voltage
Němec, Jan ; Topolánek, David (referee) ; Toman, Petr (advisor)
Connection new source of electrical energy into distribution network is important for existing one for reasons its rating and dimensioning. It is even evaluate, whether possibility connection new source in to network is real and do not endanger continuous running distribution system. This work has shown, what conditions are need realize for connection source into distribution network in view of voltage ratio. Next it must incidence harmonic current and affecting centralized telecontrol signal about reasoning. Against a background examination connection source are administrative acts, which forms basis of successful connection. On basis lets request of connection mostly study of connection working up. This study contains concrete calculation and examination individual factors for connection new source. Next put mind to connection wind power station, because wind power stations are very special source for connection into distribution network. Bigger demands are putting on them and stricter examination of connection to site must be done. Because during time unit (day, week and month) they have various strain diagram. Which makes higher straining of distribution and necessity have reserve of electrical energy for case fail wind power station owing to windless ness. In the end, there is referred to practical examination example of possibility connecting. As this example was chosen examination of wind park to 110 kW network with 32 MVA installed power from view of voltage ratio. Solution process is given by replacement of part of given Picells link and by calculation steady state of node site system with Gauss-Seidels iteration method. After that follows evaluation of voltage change in the site before and after connection of source to the network, which can not be higher than 2%. In this example is this condition satisfied and from a view of voltage ratio there is nothing to obstruct for connection new source to network.
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Steady state and short-circuit conditions within E.ON 110 kV power network at parallel operation of nodal areas of Čebín substation and Sokolnice substation
Múdry, Peter ; Rampl, Martin (referee) ; Blažek, Vladimír (advisor)
In the distribution network 110 kV of E.ON Company there are the nodal areas of Čebin substation and Sokolnice substation which are operated separately at the present time. There is one 400/110 kV transformer for each nodal area. In case of fault on one of these transformers or on busbar in which the set transformer is working, it comes to an outage of electric supply in the set nodal area. This problem has to be solved with help of the parallel operation of nodal areas of Čebín substation and Sokolnice substation. The main and also the practical task of this work is to design the bridge connection appropriate for parallel operation of nodal areas (supply transformers 400/110 kV). With help of a computing program there were made calculations of steady state and short-circuit conditions in distribution network 110 kV for separated and parallel operation of nodal areas. Voltage conditions, load of transformers (400/110 kV and 110/vn kV) and conditions on 110 kV lines are evaluated and controlled as the result of steady state calculations. Based on short-circuit conditions there is controlled the short-circuit resistance of the substations. Finally there are compared advantages and disadvantages of separated and parallel operations of nodal areas. If necessary, technical arrangements required for introduction of parallel operation of nodal areas of Čebín substation and Sokolnice substation will be designed. The theoretical part of the work deals with calculation of steady state with help of iterative methods, namely Newton´s and Gauss-Seidel methods. There are further described the method of calculating short-circuit currents, characteristic values and time behaviours of short-circuit current.
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Design of reconstruction the part of the LV distribution network including make the creation of Detail Design Documentation
Kubeša, Radek ; Wasserbauer, Vojtěch (referee) ; Bátora, Branislav (advisor)
This master’s thesis deals with problems associated with the design of LV distribution networks. In the theoretical part there are described, legislative requirements for the designer of distribution networks, overwiev of standards in which the designer should have oriented and programs used in practice to create design documentation. In the next part there are given requirements for the detail design documentation. Practical part of master’s thesis is devoted to design of reconstruction of distribution network in the given part of village. Appraisal of existing a newly design distribution network was done by calculating of stady state in the BIZON program. In the last part there is listed design documentation for construction in range for the smooth implementation of the project.
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Design of a 22 kV network in the Lipno area after the integration of the new 110/22 kV transformer station
Žižlavský, Jakub ; Koudelka, Jan (referee) ; Ptáček, Michal (advisor)
This diploma thesis deals with the design of a new 110/22 kV substation in Horní Planá. The substation design addresses, for example, the issue of reducing the load of surrounding power lines from 110/22 kV substations, reducing the size of short-circuit ratios in the surrounding system, reliability and continuity of supply, etc. Furthermore, loads of individual outgoing feeders from the surrounding substations are analyzed, in case they will be connected to a new substation. Following this, the work also addresses the related new decay points of the lines, which are determined by calculation and simulation in the Grizzly program. The simulation results could be used to compare the current load status of individual lines and contribute to the assessment of the possible benefits of both the new substation and the implementation of other modern technologies for faster and more efficient measurement and handling during operating and fault conditions.
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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 reconstruction the part of the LV distribution network including make the creation of Detail Design Documentation
Kubeša, Radek ; Wasserbauer, Vojtěch (referee) ; Bátora, Branislav (advisor)
This master’s thesis deals with problems associated with the design of LV distribution networks. In the theoretical part there are described, legislative requirements for the designer of distribution networks, overwiev of standards in which the designer should have oriented and programs used in practice to create design documentation. In the next part there are given requirements for the detail design documentation. Practical part of master’s thesis is devoted to design of reconstruction of distribution network in the given part of village. Appraisal of existing a newly design distribution network was done by calculating of stady state in the BIZON program. In the last part there is listed design documentation for construction in range for the smooth implementation of the project.
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MV netwok design for 75 new houses in Damborice
Makuta, Peter ; Novák, Vojtěch (referee) ; Ptáček, Michal (advisor)
Content of this thesis is medium voltage network design for seventy five houses in Damborice. At the beginning author discuss about history of transmission network and distribution network. Next topic is about steady state of network. In theoretic part are different solving methods of linear and non-linear simultaneous equations discussed. Author describes four methods – method of node voltages, elimination of balance node, Gauss-Seidel and Newton method. The electric properties of both the overhead transmission lines and cable lines and their variety are part of this work too. There is purpose, forms and parameters of transformers described. Simplicity of author’s design should reduce the usage of many electrical elements visible to residents.
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