|
|
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.
|
|
| |
|
|
Distribution of short circuit currents and voltages in unsymmetrical faults
Kakrda, Michal ; Topolánek, David (referee) ; Haluzík, Evžen (advisor)
The objective of this bachelor thesis is to introduce the calculation of voltage and current ratios in asymmetrical short circuits. The first part of the thesis is focused on delineating the problem of short circuits in general. It describes the causes of short circuit arising, the types of short circuits and their processes. The next part of the thesis shows the ways of calculating particular types of short circuits, namely concentrating on the method of symmetrical components. The last part of the thesis is focused on the application of the discovered findings to calculate the ratios for the particular electric network. The calculation has been made for all the types of short circuits, both symmetrical and asymmetrical. The resulting ratios are recorded into the phasor diagrams for particular types of short circuits. The part of the calculation is also the recalculation of phase currents through a transformer.
|
|
|
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.
|
|
| |
|
|
Distribution of short circuit currents and voltages in unsymmetrical faults
Kakrda, Michal ; Topolánek, David (referee) ; Haluzík, Evžen (advisor)
The objective of this bachelor thesis is to introduce the calculation of voltage and current ratios in asymmetrical short circuits. The first part of the thesis is focused on delineating the problem of short circuits in general. It describes the causes of short circuit arising, the types of short circuits and their processes. The next part of the thesis shows the ways of calculating particular types of short circuits, namely concentrating on the method of symmetrical components. The last part of the thesis is focused on the application of the discovered findings to calculate the ratios for the particular electric network. The calculation has been made for all the types of short circuits, both symmetrical and asymmetrical. The resulting ratios are recorded into the phasor diagrams for particular types of short circuits. The part of the calculation is also the recalculation of phase currents through a transformer.
|
|
|
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.
|
|
|
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.
|
guest ::
