|
|
Protection for Generator Unbalance
Kuba, Petr ; Paar, Martin (referee) ; Orságová, Jaroslava (advisor)
The thesis deals with the problem of unbalance in generators and discusses various means of generator protection against the effects caused by this abnormal working condition. The general importance of the problem is described in the introductory part of this work. The theoretical section of the thesis contains an analysis of procedures applied to solve different types of unbalance by the help of the method of symmetrical components. As a central aspect of the topic, the causes of unbalance are examined. This investigation is realized together with a close insight into the diverse possibilities of unbalance reduction and, importantly, in respect the effects of negative sequence current on a generator and its components. The principles of generator protection against unbalance are described at the end of this section. In its practical part, this work deals with the procedure of protection setting and testing. The applied protection is an actual component of the REM 543 machine terminal as made by the ABB company. In order to facilitate the testing of the protection, we used the TZO3 electrical protection testing device provided by the EGÚ Brno, a. s. company. A summary of the most important information and measurement results can be found in the final part of the thesis.
|
|
|
Using asynchronous doubly fed generators for hydroelectric plant
Cudrák, Martin ; Paar, Martin (referee) ; Radil, Lukáš (advisor)
This bachelor’s thesis deals with the use of a double fed induction machine for pumped storage power plants. Firstly, the thesis describes principles and advantages of this generator and its beneficial properties when used with PSP. Subsequently, the use of DFIG in PVE in the world is researched and the parameters of these PSP and benefits of using DFIG are identified. Furthermore, the issue of using these generators in current and planned PSP in the Czech Republic is descibed. is further assessed. In this context, planned sites for the new construction of PSP in the Czech Republic are mentioned in the bachelor’s work. And then, on the specific example from abroad, it is descibed which circumstances must be taken into account when reconstructing of existing PSP.
|
|
|
Testing of Surge Arresters
Jeřábek, Lukáš ; Paar, Martin (referee) ; Krbal, Michal (advisor)
This bachelor's thesis is devoted to metal oxide surge arresters. After historical and theoretical introduction, which explains their principles and describes their characteristical properties, analysis of the standard IEC 60099-4 and testing according to the standard with focus on the type tests follows. This chapter is also amended with review of the standard's imperfections and with its most probable future development. The work concludes with a market survey, a review of the largest manufacturers and a comparison of their products.
|
|
|
Evaluation of current DS infrastructure to potential development of charging stations in the selected area
Hýsek, David ; Krátký,, Milan (referee) ; Paar, Martin (advisor)
The bachelor's thesis deals with the evaluation of the infrastructure of charging stations and the development of fast charging stations. The first part describes the basic charging modes and parameters of selected chargers. The second part of the work presents an overview of battery electric cars and slow and fast charging. Furthermore, the work concerns the electric car policy in Europe and especially in three selected countries: The Kingdom of Norway, the Federal Republic of Germany and the Czech Republic. In the last part of the work, three scenarios of electromobility development in the selected location in Brno were compiled and subsequently the load of these scenarios on the network in the Daisy Bizon designer program was verified.
|
|
|
Analysis of production process completeness of switchgears
Stokláska, Jiří ; Bernard,, Michal (referee) ; Paar, Martin (advisor)
This thesis introduces company ABB Brno and its products. It describes the manufacturing process of a switchgear and it is focused at working procedures at particular points of the assembly line. The main part analyzes the root causes of the incompleteness of switchgears in the relation to the components availability. Time footprint was worked out. As a conclusion the proposal of changes in manufacturing process to improve the level of completeness are stated.
|
|
|
Design Laboratory Phase Shifting Transformer
Korejčík, Michal ; Švec, Jan (referee) ; Paar, Martin (advisor)
This thesis deals with a power flow control in the electric power system. An overview of FACTS devices is introduced; their basic characteristics as well as examples of their application are discussed. A significant part of this thesis investigates phase shifting transformers (PST´s), which seem to be suitable for implementation in the transmission system of the Czech Republic. The PST´s are useful devices that control active power flows on cross-border lines and regulate unwanted and unexpected power flows. Basic types and characteristics of the PST´s are discussed. In chapter 7 is designed laboratory task that should validate the regulatory capabilities of the transformer PST. Designs of models of individual parts of this laboratory task are presented. In the last part of this thesis the regulation effect of the PST is validated in the GLF/AES program.
|
|
|
Modeling of energy flows in the municipality with battery systems
Řehořek, Tomáš ; Krátký,, Milan (referee) ; Paar, Martin (advisor)
This thesis studies battery systems and possibilities of their utilization together with PV systems mainly for domestic purposes. Furthermore, the thesis deals with the impact of increased number of BEVs on load demand. The aim of the thesis is to simulate and investigate the power flows, within a selected grid, with high levels of PV generation paired with battery systems. The calculation of the power flows is performed in OpenDSS and the input data for the simulations are generated in Matlab. The theoretical part of the thesis describes the technology of the battery systems and how they operate. The thesis also partly touches on the use of battery systems for grid applications. In the practical part, an evaluation of simulations investigating the capability of battery systems to limit peaks of surplus generated energy is performed. As well as that the impact of increased load caused by BEV charging and the possibilities of reduction of this load via use of battery systems is also investigated.
|
|
|
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.
|
|
|
Battery Systems for Distribution Networks
Filip, Robin ; Radil, Lukáš (referee) ; Paar, Martin (advisor)
Bachelor’s thesis is focused on problematics of battery storage systems in distribution network. The thesis introduces methods of electrical energy storage with emphasis on battery storage systems. It also deals with possibilities of using these systems in the network. Additionally, an overview of current and planned projects with a description of the legislative environment of the area in the Czech Republic is included. The practical part deals with the design of battery storage capacity regarding to development of power consumption, electromobility as well as photovoltaics.
|
|
|
Study of Power Plant Connection to Power Network
Sýkora, Martin ; Kurfűrst, Jiří (referee) ; Paar, Martin (advisor)
It is necessary to judge the influences of producers on the electric compounds while creating electrical energy or during the regulation of those existing. These analyses are sorted out by so called studies of connectivity. These calculations analyze the degree of connection of the producer and the standby unit during a break-down. The results of this report are several recommendations for creating such unit and succeeding steps leading to secure the stability and safety of the electric compound operation. The aim of this thesis is to discuss about software for PC solutions for static and dynamic network model, to draft power outlet into a network of generating high voltage, to complete a study of connectivity with respect to all the distortion factor, as increased voltage, inrush current at startup, flicker, harmonic currents, interference ripple, contribution to short-circuit current, reactive power control options, and demands for compensation.
|
guest ::
