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Aerodynamics of axial wind turbines
Dubnický, Ladislav ; Pospíšil, Jiří (referee) ; Škorpík, Jiří (advisor)
Nowadays, the climate change issue is becoming more and more actual in our society. Increase of the average temperature on Earth in a couple of degrees could have catastrophic consequences. One of the possible solutions seems to be renewable energy sources as photovoltaics, biomass of water and wind energy. This thesis deals with the aerodynamics problems of wind energy source. Wind turbines transform kinetic energy of wind to mechanical power. The efficiency is physically limited to 59,26 %, but in reality, it is getting around 45 %. This is caused by three biggest losses inducted in wind turbines as wake losses, losses due to finite number of blades and drag losses. Based on analytical relationships and including these three losses the aerodynamics blade design is conducted. Later, the numerical simulations show higher values of drag and lower values of lift force on airfoil compared to analytical calculation. In fact, percentage deviations are acceptable and to conclude, the numerical analysis was able to relatively accurately simulate force action of free stream velocity on the blade.
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An evaluation of wind power plants effects on the environement using GIS
Komárková, Lenka ; Matějíček, Luboš (advisor) ; Přibil, Rudolf (referee)
Annotation: Wind turbines are devices that extract energy from renewable sources of energy and transform kinetic wind energy into electrical energy. Among renewable sources belong we rank sources which have the ability to partly of fully restore themselves, without human efforts. These include solar energy, geothermal energy, hydropower, tidal, wave and biomass energy. Most renewable energy has its origin in sunlight. The topic of the wind power, I chose because I find this topic up-to-date and controversial. At a time when in the whole world are non-renewable energy sources like coal, oil and natural gas is important to realize that other than by way of renewable energy sources will be avoided in future energy sources. Bachelor thesis will include a brief history of the use of wind, types of wind power, efficiency and new technologies such as offshore wind farms. The main focus will be to compare the pozitives and negatives of wind power plants and their impact on nature. Some problems associated with the operation of wind energy are exaggerated, some may be minimized. The aim will be to summarize the negatives and relevant sources to determine whether the excess of permitted limits and how wind affects the landscape and population. One part will be the noise map in the vicinity of the selected wind turbines.
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Small Wind Power Plant Project
Görig, Tomáš ; Paar, Martin (referee) ; Matoušek, Antonín (advisor)
This thesis deals with finding an suitable locality for construction and technical design of small wind power plant station. The several ways are described and the best one is chosen. Also are projected and described several choices of usage the produced energy. Next part deals with economical side of power plant project as well as the ways of usage the produced energy. Results of this evaluation helped the investor to choose the best option.
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Economics operation of Wind Power Plant
Osička, Aleš ; Macháček, Jan (referee) ; Radil, Lukáš (advisor)
The aim of this paper is to acquaint the readers with the types of wind turbines, with principle of their operation, construction design and conditions which have to be implement by the planned project of wind turbine construction before the construction is begun. There are described selected types of power plants from different manufacturers. Theoretical assessment of the adequacy of the power construction on exact place and implementing the selection of a suitable power plant according to economic evaluation method of net present value, internal rate of return and the payback period is also included. In the last part of the thesis, there is made the proposal of connection of the power into distribution system.
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Wind power plant in a chosen locality
Dohnal, Petr ; Škorpík, Jiří (referee) ; Martinec, Jiří (advisor)
This master thesis deals with problematic wind power plants. There are described advantages and disadvantages of wind power plants and their environmental impacts. Thesis include chosen locality for wind power plant, chosen fitting types of turbines and calculation which choosing turbine for chosen locality. There are accomplished parametric studies of main parameters. From this study is chosen best fitting model of wind turbine. In the end are adduced statistics from Czech Republic, Europe and world.
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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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Wind power generation and energy accumulation possibilities
Krbal, Michal ; Mastný, Petr (referee) ; Drápela, Jiří (advisor)
The goal of this bachelor’s thesis is to inform about conditions of running and the character of running of the wind power plants and about the suitable storage systems for the possibilities of time invariableness of power supply. For these reasons is immediately in the first chapter of the thesis described state of using wind power plants in The Czech republic and other countries in Europe which produce electric power. Description of individual functional parts is important mainly from the point of electrician conversion of kinetic energy of wind to electric energy with help of the electric power generator with the highest efficiency and without need for maintenance. It is necessary to know those functional parts of the power wind to be able to design appropriate storage system. The output electric power is very variable at time, mainly output voltage, because wind energy is variable too. The characteristics of the wind power plants as output voltage, frequency and their switching graded at time have to in accordance with requirements of the electricity supply systems not to disturb the stability or even collapse of the electricity supply system which would lead to serious economic consequences. These predicaments can be prevented with precise meteorological forecast or by using the acceptable storage system with small acquisition and operating costs, requirements to safeness and long service life, low weight and high efficiency of conversion of energy. The storage systems are classified into centralized and decentralizing systems with requirements to dynamic running and running time. To fulfil these conditions it is essential to choose acceptable and accessible locations with year lasting qualities of wind, which are being checked in advance using measurement and mathematical calculations.
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The grid-off Wind Power, Principle, Effectiveness, Return
Havránek, Miroslav ; Radil, Lukáš (referee) ; Macháček, Jan (advisor)
This Master´s thesis deals with problematics of wind powered generators and their use in off-grid systems. In its first chapters aspects of wind as a power source are analyzed. Further on the thesis focuses on individual components of the off-grid systems. Also designing procedures of these systems are presented in the paper. The key parts of the thesis are 3 off-grid wind power system designs, which can be used to power a family house, and their energetical and economical evaluation.
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Theory of inventive problem solving
Lněnička, Luboš ; Veselka, František (referee) ; Bušov, Bohuslav (advisor)
This thesis deals with methodology for creating innovative concepts and their solving. More precisely, TIPS methodology „Theory of inventive problem solving“. This thesis is divided into four parts. In the first part, this methodology and its five basic tools are introduced. The second part provides introduction of software Goldfire Inovator including the tools which could be useful for students working on their projects. Third part demonstrates TIPS methodology on the innovation of wind power plant supported by software Goldfire Inovator. The fourth part evaluates advantages and contributions of TIPS methodology for education and practice.
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Mathematical modeling of a wind turbine
Osička, Aleš ; Mastný, Petr (referee) ; Radil, Lukáš (advisor)
The aim of this paper is to acquaint the readers with basic classification of wind turbine configuration by used electric generator, with speed and power control used in power plants and with mathematical model of wind and parts of power plant. Procedure of making model in applications Mathematica and MathModelica is described in the other part of this paper. There were made models of power plants with squirrel cage asynchronous generator, one with pitch control, the other with stall control. In the last part of the thesis comparison of model behavior of both models with the same input conditions was made.
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