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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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Influence of Wind Farms on Electrical Energy Quality
Bartko, Jan ; Krátký,, Milan (referee) ; Malý, Jiří (advisor)
This thesis is occupied by influences of wind farms on electrical energy quality. Object of thesis was analyse influence of these power plants in a large of number. The first part was attended to presentation of wind turbines producers and their agency on worldwide and European market. At the same time were introduced new technologies of wind power generate. The second part is occupied by influence of wind farms on electrical energy quality. In this part was created model of feed system by GLF software and wind farms were connected into it. By the help of this model was run analyze of local influences of wind power plants on electrical energy quality. In last part was assessed influence of wind power plants feed system integration on electrical energy price, build and operating costs, including the prognosis to the future.
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Analysis of the electrical power measurement system in the local distribution network Pod Palackého vrchem
Hájková, Barbora ; Orságová, Jaroslava (referee) ; Jurák, Viktor (advisor)
The diploma thesis introduces a detailed analysis of the local distribution system (LDS) Pod Palackého vrchem (PPV) in the Brno, parameters of power transformers and cable routes between them. The elements of the electrical network that are influencing the balance of reactive power are described along with its sources and appliances. In the next part is defined the present concept of long-term measurement in the LDS by using current and voltage sensors. This part deals with calculations of power losses in the power transformers and the cable lines together with uncertainties concerning power measurement in the field of energetics. The essential part of the thesis focuses on the analysis of the temporary measurement implementation in the LDS, data processing along with the comparison of measured values from temporary measurement with values from permanent measurement. In conclusion, the error of the system is determined.
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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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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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3-phase Power Factoctor Corrector Units for Laboratory Training
Plucnara, Roman ; Paar, Martin (referee) ; Drápela, Jiří (advisor)
The aim is to describe the issue of compensation factor. The thesis describes the methods and individual implementation of compensation unit from rotating compensators, used until now protected compensation section and active filters. It also describes the influence of processing and elimination of higher harmonics present in the compensated circuits. The following are simple phasor diagrams and relevant patterns. The practical part shows these preconditions used to create laboratory exercises. Individual solve specific practical task illustrate the importance of reactive power compensation is using sophisticated, compensation elements used, for example, reactive power regulators. It reflected the simplest possible compensation the power factor, using the manual switching of capacitor banks.
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Reactive power changes at the TSO-DSO interconnection point by RES power factor regulation
Pololáník, Pavel ; Fiala, Zbyněk (referee) ; Ptáček, Michal (advisor)
This bachelor thesis deals with the long-term development of active, and primarily reactive energy flow at 110/22 kV distribution transformation points in the E. ON distribution network. It compares two different areas (city vs. countryside), differing in type of used distribution network and in composition of decentralized energy resources. Another point of this thesis is to describe current controlling possibilities for decentralized resources installed to the voltage level of 22 kV considering reactive power compensation. Thesis introduces proposed methods and conditions used in remote mass controlling of power factor of decentralized resources. There is mentioned an evaluation of an already performed test whose purpose was to verify possibility of influencing reactive power at the interconnection point between distribution and transmission system. The factors causing the overflow reactive power were analysed. In this thesis were analysed factors, which causing overflow reactive power from distribution to the transmission system. This analysis will be the basis for future use of mass reactive power regulation.
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Reactive Power Compensation of The Industrial Consumer
Hanzelka, Jiří ; Holoubek, Jiří (referee) ; Toman, Petr (advisor)
This thesis is focused on reactive power compensation and it suggests new conceptions for industrial customers. The first part describes the basics of compensation, location and ways of compensation. In conclusion of this part it is a good example of parallel reactive power compensation. The second part deals with the design of reactive power compensation specifically for raw water pumping station. Compensation was solved both on a low voltage level and on the high voltage level. For drawings were used program EPLAN Electric P8.
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