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Supercapacitors energy storage
Kovařík, Jakub ; Pavlík, Michal (referee) ; Boušek, Jaroslav (advisor)
This paper describes the design of DC/DC converters designed for charging supercapacitors and subsequent transformation of voltage to the desired value. In the text are presented decreasing and increasing switched-mode voltage converter including the calculation of the individual components and also the design of converter that combines both types. Using simulation software has been verified the function of each circuits, which can serves as a lower power backup supply.
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Model of four-quadrant analog multiplier AD835 for PSpice
Kuřátko, David ; Brančík, Lubomír (referee) ; Šotner, Roman (advisor)
This bachelor's thesis deals with the analog behavioral modeling of the AD835 multiplier and its simple applications in PSpice. The first part of this thesis is focused to the theoretical analysis of analog multiplier in general. This is followed by an analysis of individual elements, which are suitable for modeling of this multiplier AD835 and possibility of substitution by other elements. The next part deals with the description of the multiplier AD835, an analysis of the proposed model and confirmation of several parameters with measurement. Finally, there was noted several applications with analog multiplier AD835. Simulation results of these applications are compared with ideal expectations.
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Design of transit bus
Semerák, Jan ; Pelikán, František (referee) ; Zvonek, Miroslav (advisor)
The diplom work is focused on the design of transit bus. I pointed out two aim: design from the view of future the perspektive; environmental drive and create timeless bus design, which should be correspond with the drive of near future. It was chosen the most ecological drive with help of hydrogen and fuel cells. This drive was developed in detail. Like reserve and helpful energy source was used ultrakapacitors and fotovoltaic cells. Bus design tries to realize the future requirement of carriers and regarding to its oscillating along big cities so represent with its design the used drived unit. The internal ordering of interior tries to realize the together and future reguirements on the sit ergonomics, store of bagages, hygienic requirements and good lookout of passengers. The name and logo of transit bus arrise from reference to fuell, environment and fuell cell.
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Using brushless d.c. motor to drive servo-unit with safety function
Rudolf, Ladislav ; Mišurec, Jiří (referee) ; Prajzner, Václav (advisor)
In this work, a proposal for BLDC motor control, which will be used as a drive linear actuator. Control with microcontroller focuses mainly aspects such as motor mode, regenerative mode, measuring rotor position sensors and measuring the motor current, which corresponds to the moment. The result of the work is focused on upgrading the existing Honeywell actuator, where the processor-controlled BLDC motor to replace the existing system and take over the actuator working function and emergency function.
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The Conversion Efficiency of Different Kinds of Energy into Electrical Energy and the Possibility of its Accumulation
Ostruška, Jan ; Bartošík, Tomáš (referee) ; Macháček, Jan (advisor)
The thesis deals with the issues of the conversion efficiency of different kinds of energy into electric energy. Firstly, the thesis presents a brief introduction into types of energy sources and their capacity. Then, conversion efficiency of particular direct and indirect conversion is scrutinized, pointing to factors which affect conversion efficiency. The next chapter deals with the possibilities of accumulating electric energy. These are analysed as far as conversion efficiency is concerned as well and the end of the chapter concludes with comparison of these particular possibilities. Booth parts of the process – power generation and its accumulation – are connected in comprehensive scheme of energy conversions. The thesis develops on this scheme by mathematic description of its components and by designing a simulation programme, which would show the flow of energy in the scheme.
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DC to DC inverter for backup power supplies
Eliáš, Marek ; Zemánek, Miroslav (referee) ; Boušek, Jaroslav (advisor)
This thesis deals with the design of a DC/DC converter designed for charging supercapacitors from the 36 V voltage source and consequent back transformation of supercapacitors voltage to the required output voltage. In the thesis the designs of decreasing and increasing DC/DC converters including schematics and calculations of individual components are presented and described. The calculations necessary for the supercapacitors to meet the 10Wh energy condition and the voltage balancer on the capacitors are given below. Completely designed equipment will be assembled and tested on supercapacitors with lower energy.
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Risk analysis of energy storage
Albert, Tomáš ; Kracík, Petr (referee) ; Baláš, Marek (advisor)
This bachelor thesis analyzes the risk of accumulation of electrical energy and problems with its storage. The first part describes the various storage systems of electricity and are given their advantages and disadvantages. In the second part systems are compared against each other. The final section is intended suitability of each system and its use for application in the vicinity of Brno.
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Electric buses
Forman, Tomáš ; Porteš, Petr (referee) ; Štětina, Josef (advisor)
This bachelor work is dealing with the topic of electric buses, especially from the point of view concerning the design of traction components within the vehicle. The first part of the thesis is concerned with the history and a gradual development of electric cars, especially electro buses. The second part contains the summary of the most commonly used supply chambers of electric energy; the suitability of the usage of types of these supply chambers is also mentioned. The attention is paid to the location of such supply chambers within the vehicle as well. The following chapter is dealing with the traction electric engines – their most commonly used types, and the end of the chapter is concerned with the most usual placement of such components in the vehicle with the list of plus and cons for individual kinds. In the fourth chapter are listed certain types of electric buses in the contemporary market, with the emphasis laid on the construction solution of individual producers. The last but one chapter contains the summary of what direction is the current market of electric buses moving to, and what is the current development of this field. The very last chapter is the practical one, where I am trying to show the simplified method when calculating the optimal capacity of the batteries needed for the chosen route of the electric bus.
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Renewal energy in HPV
Bittner, Ivo ; Vorel, Pavel (referee) ; Kaplan, Zdeněk (advisor)
This thesis deals with comprehensive study and design of recovery system of a road vehicle powered by human power. It contains an overview of different types of heat recovery devices, their characteristics, advantages, disadvantages and applicability in the construction of such a vehicle.
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Accumulation of Energy from Renewable Energy Sources
Heller, Ondřej ; Radil, Lukáš (referee) ; Mastný, Petr (advisor)
The objective of the first part of master’s thesis is mapping the potential of various types of renewable sources in Europe and Czech Republic, especially solar energy, wind energy, water energy and biomass. There are described principals and ways of energy generation from these sources, brief overview of current technologies, and also their advantages and limitations. An important part is electric supply continuity from renewable sources, there are large differences and the resulting to restrictions on construction and connecting the units to the power system. In this work there are mentioned some impacts on network and rates of change of supply, some sources are also evaluated in terms of maximum power, that can be connected to the power system in our country. The conclusion of the first part is dedicated to energy storage technologies, which are suitable and usable for renewable sources, there are described their principals, properties, status of development and types of aplications, in which these technologies are used. This chapter also focusses on the price level of each technology. The second part of the thesis deals with 1 MWp on-grid photovoltaic power plant design. This design includes also the redox flow batteries accumulation, the first variant calculates on 24-hour steady energy supply, the second optimalized variant calculates on daily energy supply. There are the accumulation system costs estimated and also the payback period for the both variants. Additionally there is also determined minimum penalization for cost-effective operation. The last part is dedicated to changes of impact on the local grid and changes of system impacts, after the accumulation system is installed.
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