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Voltage magnitude deviations in a low-voltage distribution network due to increase in impedance of Y-connected load node to ground and unbalanced load
Blažek, Ondřej ; Paar, Martin (referee) ; Drápela, Jiří (advisor)
This work deals with the issue of an unbalanced power load of a three-phase main load and the associated network load of a PEN conductor. The introduction discusses the various types of systems where the distribution networks are implemented. Followed by the description of network segments causing issues discussed in this paper. The theoretical part discusses the possible operating conditions which lead to balancing the flow of neutral current, also shows the relation of the size of countervailing power charges and the form of the network load. There are also hints of possible risks that the mentioned situations may cause to the network operation in terms of function and safety. The practical part deals with the mathematical simulation model created in MATLAB. There are simulations based on which there is a description of the network behavior for the cases of induced adverse factors. The conclusion summarizes the most important results and findings produced by the simulations.
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Induction machnine control techniques and models
Vidlák, Michal ; Knobloch, Jan (referee) ; Pazdera, Ivo (advisor)
This diploma thesis deals with the design of the asynchronous mathematical model, and creation its model in MATLAB Simulink. And by creating different types of asynchronous motor control. At the beginning of the work there are theoretical knowledge about transformation of quantities into coordinates, which are needed for creation of mathematical model and further for machine control. Furthermore, control logarithms are created from these transformed quantities, which can be used to control the torque or engine speed. It is a constant magnetic flux control, scalar control, vector control, and ultimately direct torque control. All derived control algorithms have been tested in MATLAB Simulink. Where were simulations of investigated quantities.
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Utilization of fotovoltaic effect in combination with electrochromism
Šeda, Radek ; Kazda, Tomáš (referee) ; Jakubis, Ivan (advisor)
This thesis deals with the preparations of titanium and tungsten dioxide active electrochromic layers and simulation of link between electrochromic structures and photovoltaic cell. By means of electrodeposition, the active layers were made on the glass substrates ITO. These layers were subsequently analyzed, namely their intercalation properties. In this thesis, I tried to design the link between the electrochromic element and the photovoltaic cell. After this, functionality of this link was verified by software environment MATLAB Simulink.
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Articulated vehicle kinematics
Roman, Matej ; Glos, Jan (referee) ; Pohl, Lukáš (advisor)
The goal of this thesis, is to create a kinematic model of an articulated vehicle. The first part deals with finding equations of state of this system and its control driving in reverse. The second part is dedicated to implement the model in the Matlab Simulink environment and to simulate and demonstrate the functionality of control on simple examples, typical for driving in reverse. In the last part a real model is created to test the functionality of control.
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Analog effects for musical instruments
Skřivánek, Adam ; Kledrowetz, Vilém (referee) ; Pavlík, Michal (advisor)
This semestral work deals with different types of effect devices for electric guitars. Three types were chosen out of several kinds. Overdrive, Distortion and Fuzz. This effects exist in countless versions and they are still being updated. This work was done in Matlab Simulink. As next step, there was unique distortion effect chosen,moddeled and crafted.
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Modelling of Power Line Communication for data transmission
Kadlček, Václav ; Mišurec, Jiří (referee) ; Mlýnek, Petr (advisor)
Thesis deals with problems PLC (Power Line Communication) communication. It is aimed at drawing up a suitable model for testing power network PLC communication. The reader is aware of at the beginning of work with the basic principles of PLC systems, distribution and use in communication networks. Another part of the work deals with different types of interference, which occur in power networks and ways to defend against such interference. For example, an appropriate choice of modulation and coding relevant. As a source of interference in the proposed model is used AWGN channel (Additive White Gaussian Noise). Conclusion of work is dedicated to design and build a model for PLC communication. There are three models designed with different OFDM technology. Models therefore vary between different levels of key mapping in OFDM (QPSK, 16-QAM, 64-QAM). It made a detailed description of a set of blocks that were used to build models. The behavior and functionality of the proposed models for broadband PLC communication was verified in the simulation program Matlab Simulink. Finally, it is shown the comparison and evaluation of results of each modulation.
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Optimization of data communication over high-voltage lines
Minárik, Peter ; Krajsa, Ondřej (referee) ; Mlýnek, Petr (advisor)
The thesis deals with analysis of the PLC (Power Line Communication) system for data communications through powerlines. In the introduction describes the technology of data transmission through the energy network and is divided into categories corresponding with the explanation of the various specifications and features. Different types of coding, affecting the transmitted signal interference and modulation techniques used in a PLC are also described. The practical part is made up of telecommunications network model with transmission channel realized as additive white noise. The model can setup different types of modulation and coding in relate with the signal to noise ratio and bit error rates. The individual blocks settings are described in detail. The model was simulated. The results of simulation are displayed and evaluated at the end of work.
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Development of ABS Control Algorithm for Heavy Commercial Vehicle
Slepánek, David ; Porteš, Petr (referee) ; Fojtášek, Jan (advisor)
This thesis is concerned with ABS algorithm project for commercial vehicles. In the first part the reader is introduced to the history and first usage of the anti-blocking system, its principles and main functions. There are also driving algorithms and functionality system control. The second part is dedicated to the dynamic model, programs and ADAMS Car and MATLAB Simulink interfaces. It also contains the description of the algorithm, its parameters and basic functionality assay. Simulation, program interlink, testing and tuning are also described. The concluding part deals with results and their assessment.
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Analysis of Ferroresonance Overvoltage in Electrical Net
Bátora, Branislav ; Eleschová,, Žaneta (referee) ; Krejčí, Petr (referee) ; Toman, Petr (advisor)
This thesis deals with the ferroresonance phenomenon and ferroresonance overvoltage in electric networks. That’s why the introduction part explains the theoretical basis of ferroresonance and its consequences in the power system. The work then focuses on the power system as a non-linear dynamic system and describes various analytical methods for solving these systems. These methods are further applied to diagnose specific systems. There are a number of various power system configurations susceptible to ferroresonance. The most frequent one is theoretically analyzed in this thesis and a number of recommendations are offered for reducing the ferroresonance phenomenon. The thesis further deals with the selection of suitable software for this computationally chal-lenging task. A number of different tools are considered and efficiently reduced to Matlab Sim-ulink and PSCAD software. Matlab Simulink and its SimPowerSystem Toolbox are used to ana-lyze the effect of hysteresis of the magnetic core of the transformer on the emergence and course of the ferroresonance phenomenon. Using PSCAD, various configurations of the power systems are compared in terms of possible emergence and course of ferroresonance and also to find the limiting conditions that increase the probability of this phenomenon. The possibility of using arti-ficial neural networks for ferroresonance diagnosis is also mentioned in this thesis. The final part provides a number of recommendations for design and operation of both new and existing power systems.
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System of DC/DC converters for solar cells of a fotovoltaic power plant
Benda, Dušan ; Huták, Petr (referee) ; Vorel, Pavel (advisor)
This master thesis describes the design of a DC/DC converter for one photovoltaic panel with a 250 W peak power. The master thesis is divided into parts dealing with detailed design of power electronics, analog circuit design, description of control MPPT algorithms and software for control circuit. The chapter with the mathematical modeling of the converter created in the Matlab Simulink was added beyond the assignment.
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