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The reactive power compensation of the industrial consumer
Doseděl, Tomáš ; Martinák, Rostislav (referee) ; Toman, Petr (advisor)
This thesis is about reactive-power compensation used in real practise. In theoretical part, basic principles of reactive-power compensation are stated. Also, charges for breaching power factor and overview of individual compensation components are dealth with. Practical part is about the design of a low voltage compensator for industrial customer.Compensator uses central compensation with gradual switching.
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The reactive power compensation of the industrial consumer
Pospíšil, Zdeněk ; Holoubek, Jiří (referee) ; Toman, Petr (advisor)
This bachelor thesis deals with the reactive power compensation. The reactive power compensation falls into an important measures reducing current load of electrical grids and other equipments, which increase its lifespan and decrease energy losses. The bachelor thesis is divided into a theoretical and a practical part. In the theoretical part is explained the theory necessary for good understanding of compensation, explained the sanctions and the additional fees for unsatisfactory power factor and summarized the impacts of compensation on the electrical network. Further is shown the basic classification of compensation by its place of connection, type of compensation device and regulation. The end of theoretical part is dedicated to the simple calculation of compensation. The practical part deals with the real design of the reactive power compensation for a particular industrial consumer.
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Reactive power compensation of electrothermal devices
Tomeš, Martin ; Paar, Martin (referee) ; Lázničková, Ilona (advisor)
The work deals with reactive-power compensation (power factor correction = PFC) in practice. The theoretical part describes the basic concepts of power factor correction, reasons for the PFC, and the ways of the PFC, eventually a sanction for a breach of rated power factor. Attention is given to basic partition of the PFC and compensation devices which are capacitors and detuning reactors. The practical part is focused on the PFC analysis for a concrete customer where the central compensation is projected. The practical part is also focused on a detuned power factor correction which is often used by reason of increases in number of nonlinear loads nowadays.
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The reactive-power compensation of the industrial consumer
Mišinger, Ondřej ; Bok, Jaromír (referee) ; Toman, Petr (advisor)
The work deals with reactive-power compensation (power factor correction = PFC) at low and medium voltage. The theoretical part is focused on explaining the basic concepts of power factor correction and the reasons why the PFC is made. There is stated the basic allocation of PFC. Attention is devoted mainly for detuned PFC, which is nowadays often used because of the large number of nonlinear loads installed by customers. There are listed also the basic computational relations. Moreover, there are described the basic elements of compensation devices, which are capacitors, detuning reactors, contactors and power factor regulators. The practical part is dealt with power factor compensation for a particular industrial customers. There are offered several variants of the technical implementation of the PFC. These various options are compared from both technical and economic terms.
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Stabilized operation of a 400 kV power line
Sláma, Jan ; Topolánek, David (referee) ; Blažek, Vladimír (advisor)
This thesis deals with eletrical calculations of long stabilized 400 kV power lines. The main objective is to determine the eletrical parameters of power line beginning in case the parameters of line end are known for various power factors. Also the calculation methods of power lines is generally dealt with. Power-voltage way of computation and a method of exact solution was used for the calculations as to control the results.
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Stabilized operation of the 400 kV power line
Jurča, Ondřej ; Bok, Jaromír (referee) ; Blažek, Vladimír (advisor)
This thesis deals with methods of solving lines under voltage levels of a very high transmission voltage and extra high voltage. The first, theoretical part of this paper analyses different methods how such lines are solved. In particular, an accurate solution is provided simulated by means of a line with evenly distributed parameters, and an approximate solution simulated by means of a line with lumped parameters. Furthermore, special cases of steady running conditions of the line are reviewed, such as no-load running, short-circuit run and line operation with natural load. In conclusion of the theoretical part is given a general method of solving an extra-high-tension and extra high voltage network; also, some graphical methods of solving such networks are shown including their brief description. The second, practical part of the present paper involves application of the above mentioned methods of solution on a specific line with given parameters, solving conditions at the beginning of the line under steady running conditions and in special cases of the line operation. The conclusion of the thesis summarises the obtained results and provides final assessment of the individual methods of solution in terms of calculation accuracy.
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Switched power supply
Krist, Jakub ; Kosina, Petr (referee) ; Pavlík, Michal (advisor)
The thesis is focused on design the switching power supply according to Push-pull topology rules. The work describes basic theoretic principles of Push-pull topology with design of circuit and circuit elements.
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Load flow analyses of reactive power in distribution system
Krátký, Michal ; Kašpírek,, Martn (referee) ; Topolánek, David (advisor)
This thesis is focused on issues with transmission of reactive power though the distribution line of E.ON area. The goal is to find out where and in what rate are overflows of reactive power and to project the correctional steps to minimize this overflow. In this solution, there were used data of dispatcher measurement, which were processed by created source code in Matlab. The processing was analyzed for final conclusion. There were discovered shortages in overflow of reactive power in transfer between distribution and transmission line and in unsuitably regulated capacity power factor in Planá power plant and wrong automatic regulation of turns in 440/110kV substation Dasný. The action to minimize overflows of reactive power was projected by decompensation reactor placed in T101 and T102 transformers in substation Tábor.
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Utilization of MERS in heavy current engineering
Vetiška, Vojtěch ; Procházka, Petr (referee) ; Huzlík, Rostislav (advisor)
This graduation thesis is aimed in usage of MERS circuits in high-current electroengineering. The MERS circuit is a serial variable capacitor which capacity is possible to change by the help of switching of semiconductor components. On beginning of the thesis I shall acquaint you with usage of the MERS circuit. It will be sketched out their basic circuitry, the operating method, possibilities of transistors switching and calculation of the capacity capacitors for particular controlling method. On the prepared device we shall accomplish the predefined measurement. Furthermore we shall create the simulation by means of the Matlab programme. In the end we shall compare the results of the simulation with measured values.
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