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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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Experimental Agrophotovoltaic System
Krnáč, Štefan ; Paar, Martin (referee) ; Baxant, Petr (advisor)
Agrophotovoltaics is a hot topic not only in the field of agroculture but also in field of EE using renewable sources. This work summarizes human impact on the environment, possible remediation with help of AFV, projects already implemented by companies abroad and their knowledge of the use and development of AFV systems. The work also mentions advantages and disadvantages that could arise if we began to use these systems in Czech Republic and Slovakia. The last chapter contains already functional APV project, which we built on top of the roof of building T12.
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Analysis of Electric Power Consumption of Public Lighting
Varmuža, Jan ; Pavelka, Tomáš (referee) ; Paar, Martin (advisor)
The thesis deals with analysis of the public lighting system from the point of view of light sources and luminaries. It focuses on the specifics of the lighting systems such as lighting for pedestrian crossings or decorative lighting. It analyzes the energy consumption depending on daylight and how it manifests a shift sunrise and sunset on the consumption of electricity. The work clarifies how the model can be simplified sunrise, sunset for the entire Czech Republic. Based on the distribution of municipalities with population over 10,000 and modeling of sunrise and sunset calculation is carried out power consumption of lighting systems and compared to the total consumption of the Czech Republic. Simplification is an estimate of the consumption of electricity to villages to 10 000 people on the basis of the estimate, the final consumption of electricity for public lighting for the entire Czech Republic.
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The calculation of the short circuits of the given network
Bordovský, Lukáš ; Paar, Martin (referee) ; Toman, Petr (advisor)
The main aim of this Bachelor thesis is to introduce you a calculation of short-circuit rates in compliance with IEC 60909, and a subsequent calculation of a scheduled real network. The thesis itself is divided into two parts : a theory about the short-circuit problems and a simple model example are stated in the first part, in the second part is stated the calculation of the given real network for the case of an occurence of shunt faults at distribution points, namely a three-phase fault, a two-phase isolated fault, a double-phase-to-earth fault and a single phase fault. The work is coupled with a determination of current and voltage rates at points P and K. At the point P is situated distance protection relay and at the point K comes the shunt fault. The calculations are done with a method of successive simplification.
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Range of production electric energy from roof PVE
Chmelař, Šimon ; Vojtek, Martin (referee) ; Paar, Martin (advisor)
The aim of the thesis is to compare localities with suitable conditions for the construction of photovoltaic power plants in comparison with unsuitable location. The first part of the thesis contains a market review with a selection of current panels and tiles with their parameters. Furthermore, the thesis analyzes various technologies and their advantages and disadvantages. This part also includes a brief overview of the historical development of photovoltaics both around the world and in the Czech Republic and the theoretical limits of the technologies. In the second part of the thesis, two localities, one with the suitable conditions and one with the unsuitable, were selected to calculate their potential electricity production from PV plants, which were then compared.
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Short Circuit Currents in DC Systems
Kolařík, Robin ; Geschwinder, Lukáš (referee) ; Paar, Martin (advisor)
The bachelor thesis deals with the analysis of short-circuit currents in DC systems. The thesis introduces the possibility of application of low voltage DC distribution in commercial and industrial buildings. The second part is focused to high voltage direct current transmission. The practical part deals with the calculation of short-circuit currents of individual elements and subsequently with short-circuit conditions in the DC network. At the end of the work are evaluated advantages and disadvantages between AC and DC voltage and suitability of use in given areas.
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Analysis of energy balances for energy communities
Pavlík, Libor ; Kučera, Michal (referee) ; Paar, Martin (advisor)
The bachelor thesis deals with the assessment of the state of energy communities in the EU and the Czech Republic in order to provide a comprehensive view of their functioning and potential. Key aspects of energy communities are discussed, including the legal framework and technological options. The main objective of this thesis was to analyse the possibility of applying community energy to the municipality of Bánov. Based on the analysis, several options for the development of energy communities in the municipality are proposed. The performed calculations and analysis serve as a basis for assessing the potential and effectiveness of the proposed measures.
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Basic principles of flexibility aggregation
Ošťádal, Martin ; Paar, Martin (referee) ; Radil, Lukáš (advisor)
This thesis deals with the basic principles of flexibility aggregation. In the beginning it introduces the history and present state in the field of regulation and prospects for the future. After defining the concepts associated with flexibility and aggregation, the necessary modifications for the functioning of flexibility aggregation are formulated. Next, foreign methods of energy regulation are mentioned, as well as possible obstacles to these new methods in the respective countries. The paper concludes with an analysis of data from Pecan Street Inc. to show the effect of flexibility on daily load profile and the similarity of power waveforms throughout the day for provided households.
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