National Repository of Grey Literature 25 records found  1 - 10nextend  jump to record: Search took 0.01 seconds. 
Modern protection of distributed energy resources
Bučko, Ondrej ; Kopička, Marek (referee) ; Topolánek, David (advisor)
The aim of this thesis is to describe distributed energy resources (DER) protection system’s main problems and to suggests their possible solutions. The second part is focused on collecting information and description of the new functional principles of protection devices used for protecting distribution network against backwards influences from the DER. The purpose of the thesis is the description of functional principles of the protection devices that are not commonly used in the distribution networks of the Czech Republic. In addition, the schemes of functional blocks of the protection devices that help to configure or project them are also part of this thesis.
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.
Creation and estimation of small hydro power plant model in PSCAD
Razyapova, Aygul ; Radil, Lukáš (referee) ; Kopička, Marek (advisor)
This thesis focused on creating a model of a small hydropower plant model (SHPP) and a part of the electricity network in the simulation software "PSCAD" (basing on real sources). The model will be specified on the basis of the data obtained from the measurements to correspond with the real equipment.
Model of electric energy storage with management system based on general assumptions
Sedlák, Miroslav ; Kopička, Marek (referee) ; Radil, Lukáš (advisor)
The accumulation of electricity as an issue is becoming more important and it’s importance is constantly growing. This is due to the fact that more renewable energy sources, mainly photovoltaic and wind power plants, are being incorporated into the electricity system, causing changes in the power grid performance. Changing in the behavior of consumers of electricity can cause further changes in the network. The ability for compensations of these changes in the power grid has just accumulation systems. This Thesis for Master’s Degree presents selected storage systems and ways in which energy can be stored. Further, in this work, a model of accumulation system with management based on general conditions will be created. This model will be tested and its behavior detected under the limit conditions.
Cooperation between the inverter and grids in island operation
Urant, Tomáš ; Kopička, Marek (referee) ; Radil, Lukáš (advisor)
This thesis deals with the creation of models of non-volatile sources connected to the power system using power converters and their connection by filter or a transformer. Furthermore, the thesis will deal with the study of the problem of connecting a large number of these sources. Another area of interest is to determine the conditions under which these sources can be used to restore network voltage after a previous outage. In the PSCAD program we will create inverter models (6 pulse, 12 pulse and one phase). In the next step, a network model will be created, where the individual sources will be connected and, in the end, we will simulate the situations. The output of the thesis is to determine the behavior of the largest number of static sources in the system and thus to contribute to the knowledge about the possibilities of safe and stable operation of non-volatile energy sources in the power system.
Options of network operation with distributed generation sources in island operation
Mareček, Tomáš ; Drápela, Jiří (referee) ; Kopička, Marek (advisor)
This diploma thesis presents managing of the island mode using distributed generation. In the theoretical part of the thesis, the power system of the Czech Republic is described, together with its future development, and future development of installed capacity of distributed generation. Types of distributed generation are also mentioned. Next part of this work is focused on technological parts of islanding operation and its requirements. The following part describes components of the smart grids and mentions some of its functionalities. The practical part of the thesis describes the created models of components in PSCAD programme. From those components two slightly different grid models are created. On those grid models, simulations are made, during which island mode is created. Some of the grid functionalities are tested during those simulations, for example; reaction of the island mode for load increase, load decrease and others.
Islanding Detection
Bárta, Jan ; Ptáček, Michal (referee) ; Kopička, Marek (advisor)
The bachelor thesis discusses islanding in electric power system and various methods for its detection. The thesis contains a list and description of legislation concerned with islanding, description of few selected islanding detection methods, and their comparison. The practical part of the thesis consists of simulations of several detection methods performed in the virtual environment of PSCAD and their evaluation.
Creation and estimation of small hydro power plant model in PSCAD
Razyapova, Aygul ; Radil, Lukáš (referee) ; Kopička, Marek (advisor)
This thesis focused on creating a model of a small hydropower plant model (SHPP) and a part of the electricity network in the simulation software "PSCAD" (basing on real sources). The model will be specified on the basis of the data obtained from the measurements to correspond with the real equipment.
Model of electric energy storage with management system based on general assumptions
Sedlák, Miroslav ; Kopička, Marek (referee) ; Radil, Lukáš (advisor)
The accumulation of electricity as an issue is becoming more important and it’s importance is constantly growing. This is due to the fact that more renewable energy sources, mainly photovoltaic and wind power plants, are being incorporated into the electricity system, causing changes in the power grid performance. Changing in the behavior of consumers of electricity can cause further changes in the network. The ability for compensations of these changes in the power grid has just accumulation systems. This Thesis for Master’s Degree presents selected storage systems and ways in which energy can be stored. Further, in this work, a model of accumulation system with management based on general conditions will be created. This model will be tested and its behavior detected under the limit conditions.
Technical modification design of the electrical power systems for Modřice and its surroundings
Šerý, Petr ; Kopička, Marek (referee) ; Ptáček, Michal (advisor)
ABSTRACT This thesis is concerned with a technical modification of design of the electrical power systems for Modřice and its surroundings. The thesis describes a basic theoretical distribution of the electricity network and the distribution network itself. Following chapters are devoted to the development and construction of the HV networks and to the methods and ways of calculating the steady operation of the network. These methods are then used in the computational programs that are presented in the next chapter of this paper. The aim of the practical part of the thesis is to first determine the current state of the network in the given location. Furthermore, several modifications are proposed according to the requirements for increasing the power consumption or connecting the new supply places. The proposed modifications are further assessed for the different operating conditions. The result is a network that is functional, operational and reliable. The whole analysis is carried out in the PAS DAISY Off-line V4 Bizon computing program.

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