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Analysis of parallel operation of nodal areas of 110 kV Krasikov and Neznasov transformers stations
Kostkan, Petr ; Kopička, Marek (referee) ; Ptáček, Michal (advisor)
Currently, the nodal areas of Neznášov substation and Krasíkov substation, which belong to ČEZd distribution network 110 kV – East, are operand as separate units. In the defined setting, each nodal area comprises of two 400/110 kV transformers. In the case of failure of the transformer T401 or T402, the criterion N-1 for twenty percent of the rated output is not met. Such problem can be solved by parallel operation of nodal areas of Neznášov substation and Krasíkov substation. The principal as well as practical aim of this thesis is to interconnect the bridge operated connection in separated areas into parallel/loop operation of nodal areas (supplied by 400/110 kV transformers). Computing software is used to calculate the steady state and short-circuit conditions in the distribution network 110 kV for separate and parallel operation of mentioned nodal areas. Power flow analysis is aimed at assessment and evaluation of voltage conditions, transformers loading (400/110 kV and 110/vn) as well as 110 kV lines loading. Obtained short-circuit indices is used to examine short-circuit, withstand capability of the 110 kV substation. Finally, benefits as well as drawbacks of the separate and parallel operation are compared and evaluated. If necessary, the technical arrangements are proposed/designed in order to allow parallel operation of nodal areas Neznášov substation and Krasíkov substation.
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Stabilized operation and short - circuit conditions within E.ON 110 kV power network supplied from Čebín 110kV switching station, during the period of 2011
Chrástek, Radim ; Janda, Petr (referee) ; Blažek, Vladimír (advisor)
The aim of this thesis is to project an operation of bridge connection in distribution network in Čebín’s nodal area. The main task is to check a fulfilment of voltage tolerance in distribution substations 110 kV, load transformer control (400/110 kV, 110/VN kV), distribution power line 110 kV control and short - circuit conditions control. Relevant calculations are performed by dispatching control system, which works with the actual parameters of all distribution network‘s 110 kV facilities. The theoretical part of this thesis is devoted to the way of the calculation of stabilized operation and the short-circuit conditions. In practical part, first we perform an analyse of stabilized operation and the short-circuit conditions of distribution network 110 kV in actual operation. Next step deals with bridge connection design and analysing its operation. The operation of bridge connection is verificated even in specific conditions (disturbance state, increased load). The next section evaluates the results of the calculations. First we deal with actual operations evaluation and proposed the bridge connection. In the next section we evaluate the operation of the bridge connection in the specific operating conditions. Finally, we evaluate the losses in the distribution network 110 kV. If the calculations of the stabilized operation or the short-circuit conditions of distribution network discovers that some of its elements are overloaded, we propose changes to ensure safe and reliable operation of the distribution network.
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Load Flow Solution of a 110kV Network
Tauš, Vladimír ; Vaculík, Petr (referee) ; Topolánek, David (advisor)
Content of this thesis is theoretic introduction to the steady state of network, theoretic analysis of methods, which serves for calculation of steady state of network such as Gauss Seidel iterative method or Newton Raphson modified method and economy in the energetics, concretely fixation of costs of the power line and calculation of the optimal time of building up the recuperative power line. This thesis includes calculation of steady state of requested network with normal trouble-free network and for criterion (n-1), their analysis and design of recuperative precaution.
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The Operation of Distribution Grid with High Penetration of Renewable Sources
Modlitba, Petr ; Kozák, Miroslav (referee) ; Toman, Petr (advisor)
This work deals with the connection of distributed generation into the distribution grid. The first part describes the methodology for calculating the steady state of alternating current network. The second part deals with the conditions of connecting distributed generation into the grid. The third part describes the types of power sources and distribution system 110 kV in the area supplied from the transformation 220/110 kV Sokolnice. On the basis of the simulation model there were performed calculations of 110 kV network steady-state operation in the nodal area Sokolnice to verify the electrical network conditions during operation of distributed generation. There were also evaluated possibilities for an increase in installed capacity of distributed sources.
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Analysis of 110 kV distribution network in the Otrokovice nodal area
Vachutka, Ondřej ; Kučera, Michal (referee) ; Ptáček, Michal (advisor)
Master's thesis deals with analysis of distribution network 110 kV in south Moravia area. Therefore it makes basic description of the scope EG.D, a.s. company, current state of the 110 kV electricity network and their development. The practical part of the master's thesis is focused on the transmission capacity of the 110 kV wiring and the voltage monitoring in the substation during winter network load. Simulations were constructed for analysis of network load for the years 2020, 2025, 2030 and 2035. Steady state was calculated for the normal state as well as for the emergency state (N-1). The analysis was created to ensure 110 kV distribution network in the nodal area Otrokovice during the failure of the entire 400/110 kV Otrokovice transformation station for the years 2025, 2030 and the design of a new 400/110 kV substation.
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The Analysis of the Possibility of Realization of a New Substation 400/110kV as a Substitute for TR Tábor
Modlitba, Petr ; Kozák, Miroslav (referee) ; Toman, Petr (advisor)
This thesis deals with the assessment of the location of the new transformer station 400/110 kV in terms of conditions in the 110 kV network, which will be supplied from this substation. The new 400/110 kV transformer station will replace the current transformer station 220/110 kV Tábor, which will be decommissioned in connection with the overall 220 kV system attenuation in the Czech power transmission system. On the basis of the load flow simulation of the 110 kV distribution network and calculations of the short-circuit conditions performed by simulation SW LUG two variants of the location of a new 400/110 kV transformer station were assessed. The 110 kV network calculations were focused on the evaluation of voltage conditions, the 110 kV lines loading in the standard operating scheme and in failure states according to the N-1 criterion, short-circuit conditions and losses. On the basis of the computational analyses, the technical measures necessary to ensure the reliable operation of the 110 kV network in the given area are designed and economically evaluated.
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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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Load Flow Calculation of Chosen Part of E.ON 110kV Grid with Analysis of Reactive Power Flow
Skoupý, Martin ; Vaculík, Petr (referee) ; Toman, Petr (advisor)
Content of this bachelor thesis is theoretic introduction to the steady state of network and optimization of network operation from the viewpoint of reducing active power losses in the electric wiring. Furthermore, the work deals with analysis of the network traffic flow distribution of the active and reactive power and consequences of overflow of the reactive power from the medium voltage level to the high voltage level. The following part includes designing practical involvement of the area and carrying out calculations of its operation in terms of losses. Another chapter is proposition of measures to minimize the overflowing of reactive power in distribution system and its impact on reduction of operating losses in the network. In the conclusion the work summarizes results obtained and the final assessment of influence of reactive power for operation of the network.
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Analysis of 110 kV distribution network in the Otrokovice nodal area
Vachutka, Ondřej ; Kučera, Michal (referee) ; Ptáček, Michal (advisor)
Master's thesis deals with analysis of distribution network 110 kV in south Moravia area. Therefore it makes basic description of the scope EG.D, a.s. company, current state of the 110 kV electricity network and their development. The practical part of the master's thesis is focused on the transmission capacity of the 110 kV wiring and the voltage monitoring in the substation during winter network load. Simulations were constructed for analysis of network load for the years 2020, 2025, 2030 and 2035. Steady state was calculated for the normal state as well as for the emergency state (N-1). The analysis was created to ensure 110 kV distribution network in the nodal area Otrokovice during the failure of the entire 400/110 kV Otrokovice transformation station for the years 2025, 2030 and the design of a new 400/110 kV substation.
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Analysis of parallel operation of nodal areas of 110 kV Krasikov and Neznasov transformers stations
Kostkan, Petr ; Kopička, Marek (referee) ; Ptáček, Michal (advisor)
Currently, the nodal areas of Neznášov substation and Krasíkov substation, which belong to ČEZd distribution network 110 kV – East, are operand as separate units. In the defined setting, each nodal area comprises of two 400/110 kV transformers. In the case of failure of the transformer T401 or T402, the criterion N-1 for twenty percent of the rated output is not met. Such problem can be solved by parallel operation of nodal areas of Neznášov substation and Krasíkov substation. The principal as well as practical aim of this thesis is to interconnect the bridge operated connection in separated areas into parallel/loop operation of nodal areas (supplied by 400/110 kV transformers). Computing software is used to calculate the steady state and short-circuit conditions in the distribution network 110 kV for separate and parallel operation of mentioned nodal areas. Power flow analysis is aimed at assessment and evaluation of voltage conditions, transformers loading (400/110 kV and 110/vn) as well as 110 kV lines loading. Obtained short-circuit indices is used to examine short-circuit, withstand capability of the 110 kV substation. Finally, benefits as well as drawbacks of the separate and parallel operation are compared and evaluated. If necessary, the technical arrangements are proposed/designed in order to allow parallel operation of nodal areas Neznášov substation and Krasíkov substation.
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