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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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Project of Outgoing Transformer Unit for the Photovoltaic Power Station
Hanák, Miroslav ; Procházka, Aleš (referee) ; Orságová, Jaroslava (advisor)
This master’s thesis engages in project of outgoing transformer unit for the photovoltaic power station. It describes project and its design documentation what conducts to practising of construction. It has compared investing to more expansive transformer what has lower loss. It describes charges of operation’s transformer in twenty years. It leads project of cable low voltage. It compares whether is better to use aluminium or cupric cables. Project is led with respect for investment costs and minimum of operation loss.
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Assessment of connectivity of the new source to the 110 kV network
Kopečný, David ; Fojtík, Martin (referee) ; Orságová, Jaroslava (advisor)
This thesis focuses on the connectivity problems of the new sources to the electrical network. The first part of the thesis deals with the description of the new source and the method of its connection to the electrical network. Furthermore, in work, there are elaborated the blocking conditions for substation TR Neratovice expanded distribution point. A distribution network operator must receive an attachment application for connecting before the actual connection. The attachments consist of study cases of conjunction that values the inverse influence on the distributional network and informs the operator about the required measures for the reliable service with the new source. PSS Sincal computer software was used to survey the inverse influences on the distributional network. Based on processed data, the evaluation of conjunction of the synchronous generator to the grid at TR Neratovice substation was reconsidered.
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Evaluation of possibilities for connection of wind farm Drahany 45 MW to 110 kV network
Gregr, Tomáš ; Opat, Jaroslav (referee) ; Topolánek, David (advisor)
This Master's thesis is focused on connecting of new power sources into electrical network, particularly, the steady state and allowed voltage variation in network nodes, which occur in steady state before and after connection of a new power source into distribution network, with regard to valid legislation. The new power source in question is the new wind farm Drahany with active power of 45 MW, which should be connected into distribution network 110kV, operated by distribution company E.ON. The aim of this work is to find the most suitable connection point of a wind farm into distribution network, considering transmission capacity of individual electric lines and voltage variations in network nodes, as well as Drahany wind farm's investor's expenses on construction of a connection line to connection point and the distribution network's operator's expenses on modification of the connection point. Also, methods of calculating of electric networks in steady state are described in this paper, particularly, linear calculations, because these are needed for the calculations in E-vlivy program, in which the possible options of Drahany wind farm's connection into network 110 kV, in various places, were modeled. The description of the E-Vlivy program is also included in this paper. The E.ON company's materials form the basis for this Master's thesis, which will later serve as one of the documents needed for Drahany wind farm’s connection point evaluation into distribution network 110 kV.
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Project of Photovoltaic Power Plant Grid Connection
Blažek, Tomáš ; Procházka, Aleš (referee) ; Orságová, Jaroslava (advisor)
This bachelors thesis deals with photovoltaic technology and economic evaluation of used technology equipment. The first part describes the technology for extraction of power from photovoltaic sources - transformer 22/0,4kV and its basic parts. Then there is the calculation of the amount of openings for cooling the transformer according to ČSN 33 3240. The second part focuses on the description of the major part of the photovoltaic plant. Here are divided solar panels on the material from which they are produced and the type of installation in the field. Next is describe the types of inverters, their principles and functions. The last part compares the different types of transformers and operating costs over the lifetime of plants (20 years), are described factors for proper selection of inverters and solar panels.
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Management of the energy transmission system polygon
Bohačík, Antonín ; Musil, Petr (referee) ; Blažek, Petr (advisor)
The diploma thesis is focused on the creation of a control interface for a polygon simulating the electrical distribution network of the Czech Republic, where communication between substations is realized by IEC 60870-5-104 protocol. The theoretical part of the thesis explains the basic principles, properties and possibilities of communication standards IEC 60870 and IEC 61850. The next part is focused on the actual implementation and subsequent implementation of the control interface, including the implementation of the IEC 61850-80-1 module for data transfer between the mentioned standards. The last part describes the created behavior scenarios or the analysis of communication itself.
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Stabilized operation and short-circuit conditions within E.ON 110kV power network supplied from Otrokovice 110kV switching station, during the period of 2012
Kuba, Petr ; Rampl, Martin (referee) ; Blažek, Vladimír (advisor)
This thesis deals with steady running and short-circuit conditions in the 110 kV network, E. ON, fed from 110 kV Otrokovice. Substation Otrokovice ensures system transformation from 400 kV to 110 kV system through three transformers. In order to increase reliability of power supply and improved economy is considered to bridge the transition from the operation of two transformers in bridge operations of the three transformers. However, this brings with it significant worsening of short-circuit conditions in the 110 kV network. The task of this work is to evaluate and compare the two variants of operation in terms of steady running and short-circuit conditions in the network at 110 kV and then implement operational and technical measures. The introduction describes the electricity system and its parts. The theoretical part of the paper discusses ways of dealing with steady running and short circuit conditions of long lines. Practical part will deal with applications of knowledge on the network. The conclusion summarizes the most relevant information and the results assessed both variants.
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Short - circuit conditions at Sokolnice 110 kV switching station following a direct 400/110 kV transformation
Hajdú, Lukáš ; Paar, Martin (referee) ; Blažek, Vladimír (advisor)
The goal of this bachelor´s thesis is to evaluate short-circuit conditions at the Sokolnice 110kV switching station before and after installation of a T402 transformer – before and after application of a direct 400/110kV transformation. By evaluating these conditions determine whether the originally installed protective elements (power circuit-breakers) are capable of fulfilling the new short-circuit requirements at the switching station. The thesis consists of two parts: the first part introduces the theory required to evaluate the short-circuit conditions at the switching station, while the second part calculates the actual short-circuit currents and power outputs. The methods used for calculation are sequential simplification and symmetrical components.
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