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Original title in Czech: Silnoproudá elektrotechnika a elektroenergetikaFEKTAbbreviation: PP-SEEAcad. year: 2016/2017
Programme: Electrical Engineering and Communication
Length of Study: 4 years
Accredited from: 25.7.2007Accredited until: 31.12.2020
Profile
The goal of the postgradual doctoral (PhD) study is the education for scientific work in the area of power electrical engineering and power systems. Graduates of PhD find occupation either as scientific or research workers including industrial development, either as universty teachers and in higher manager functions as well
Key learning outcomes
PhD-graduate obtains high theoretical knowledge and will learn to solve complicated scientific and technological problems by oneself PhD-graduate is ready for further professional rise with a high degree of adaptivity Graduates of PhD find occupation either as scientific or research workers including industrial development, either as universty teachers and in higher manager functions as well
Occupational profiles of graduates with examples
The graduate obtains broad knowledge of subject of high power engineering. The knowledge is build mainly on theoretical background of the subject. Moreover the graduate will obtain deep special knowledge aimed in direction of his/her thesis. The graduate will be able to perform scientific and/or applied research based on up to date theoretical knowledge. The graduate will be able to organize and lead a team of researchers in the studied subject.
Guarantor
prof. RNDr. Vladimír Aubrecht, CSc.
Issued topics of Doctoral Study Program
The experimental part of the work will deal with a detailed analysis of turn-on and turn-off switching processes in IGBT and MOS-FET power transistors, focusing especially on very fast transistors based on the SiC and GaN materials. Considering the extreme switching speed of these semiconductors, it will be necessary for the purpose of oscillographic measurements to develop current sensors with a very large bandwidth of at least 300 MHz. The theoretical part of the work will be focused on determination of a mathematical model of the turn-on and turn-off processes in the transistor. The model will be realized using the experimentally obtained data. The purpose of the model will be an exact calculation of switching losses in a transistor in arbitrary operating conditions.
Tutor: Procházka Petr, Ing., Ph.D.
Increasing deployment of power converters in distribution systems leads to rise in high-frequency conducted disturbance level related to the converters switching frequencies. The switching disturbances occur dominantly in frequency range from 2 kHz to 150 kHz. Current experience shows that such disturbance may lead to serious malfunction of grid-connected sensing, measuring and/or controlling systems of analog or digital nature. At the same time there is significant gap in EMC coordination and standardization since the frequency range was for a long time out of interest. It is just between low-frequency disturbances connected to power quality and radio-frequency disturbance. The project is focused firstly on development of suitable measuring apparatus and procedure to monitor the disturbances in distribution systems in the audio-frequency range. Then origin and propagation of the disturbance should be studied and finally EMC concept is expected to be proposed. The theme takes a part of research project in cooperation with Czech utilities and with foreign universities (Germany, Italy). Ask for more details at drapela@vutbr.cz.
Tutor: Drápela Jiří, prof. Ing., Ph.D.
With increasing number of DC power network related applications, necessity of the power/voltage quality assessment in those DC Power Systems can be expected. The aim of the work is to develop DC voltage quality indices starting from DC traction systems and AC public distribution systems voltage quality assessment practice. The theme takes a part of a research project in cooperation with K M B systems company. More information: drapela@feec.vutbr.cz.
The dissertation will be focused on development of new extended protection functions optimized for distribution networks which would make use of the advantages of current or voltage transducers with a digitalized output. Thanks to the possibility of secondary signal correction and loss-free transmission of monitored signal, these transducer types offer a number of advantages when compared to the conventional solution on the basis of instrument transformers, such as high linearity, high accuracy in the wide frequency range, the possibility of temperature, phase displacement and amplitude correction and suchlike. Thanks to these precision transducers it is possible to use data monitored with high accuracy in the range from operating currents to the area of short-circuit currents without a danger of their saturation. Thanks to synergy of the project targets with modern electronic current transducers, the research activities will be also focused on the research of the methodology for evaluation of accuracy and operational qualities of new types of electronic transducers.
Tutor: Topolánek David, doc. Ing., Ph.D.
The development of electromechanical systems in particular is currently associated with the requirement of high reliability and durability as defined in connection with the transition to higher levels of performance and speed. Therefore, the topic is focused on assessing the impact of failures on the part of the electromechanical system's operating characteristics. The aim is to complete the study and diagnosis of electromagnetic and mechanical properties on the vibration generation and application of supply current. The work consists of theoretical, experimental and practical part. The issue is to continuously UVEE resolved within several projects.
Tutor: Veselka František, doc. Ing., CSc.
The concept of permaculture is known and has been used for nearly 40 years and is mainly associated with a sensitive approach to agriculture, nature and the environment so as to achieve sustainability. In areas where there has been damage to nature and seeks to ensure the subsequent regeneration and management of natural resources. Recently in permaculture they classified as advanced technologies associated with the use of renewable energy sources, especially locally available without energy transfer. Topic of study will focus on the research into the technologies available today for obtaining and use of energy, the least possible impact on the environment. This approach is often called a naming. "Eco". In this thesis, the student addressed the issues not only the use of ready-made systems, but also the design of new concepts eg. Small mobile power station, which could be shared between multiple users and used as temporary sources when they are needed. Part of the work would be given to energy-saving light sources for natural buildings and open spaces. In another part of the student engaged in the life cycle of existing and potential new facility. The purpose should be to ensure maximum recycling of materials and minimizing environmental impacts.
Tutor: Baxant Petr, doc. Ing., Ph.D.
Currently, the distance relay are only used for 110kV line protection, which have also the function of the fault locator. These relays can fairly accurately and reliably determine the faults distances only assuming of homogenous parameters of protected lines over their entire lengths that are also used to set the locator. This assumes that there are identical phase and earth conductors used in the entire length of the line and the complete conductors transposition is provide. In a real network, this condition is fulfilled only rarely and numerous other negative effects associated with the 110 kV networks operation affects the fault locator function - "T" feeders for the connection of source or load, double circuit line, parallel line in one corridor with protected line, etc. The aim of the dissertation is clearly identifying the negative effects on the fault locator function and create localization algorithm, which will respect them and allow more accurately determine the fault location.
Tutor: Orságová Jaroslava, doc. Ing., Ph.D.
The urgent need for the development of charging stations for hybrid cars and electric vehicles (EV) still shows as important in the context of the current gradual development of this type of transport. The theme is focused on energy analysis of the concept of charging stations with integrated accumulation and renewable energy sources. Based on the concept will be developed the mathematical models. It will be performed energy-economic analysis in order to verify the possibility of using the concept in this way to reduce the load of the network at the connection point. Direct possibility of cooperation on concrete solution with an energy company is expected.
Tutor: Mastný Petr, doc. Ing., Ph.D.
Visible light variation may leads to disturbance of human’s visual perception. The origin of such negative effect is in the eye anatomy and physiology. The major influence on the flickering light perception can be found in eye viewing field, photoreceptors (cones of three types and rods) and their distribution at retina as a part of eye anatomy and in eye adaptation mechanisms like pupil, photo-chemical and neural adaptation (response) to luminous variations (including the photoreceptors spectral luminous efficiency) as a part of eye physiology. The human eye can be seen as specialized luminance multi-detector where the stimulation contrast is as important as radiant density. There are differentiated three types of flicker: temporal, spatial and chromatic. All of these flickers are joyless and may involve many psychological interactions. In artificially illuminated areas, lamps light variations due to variations in supply voltage may also lead to flicker perception. Such lamp possibly will produce light with time-varying radiant flux and its spectral distribution. The lamps flickering is produced by a voltage Phase Modulation (PM), mainly by Phase Jumps (PJ) and by Interharmonic Voltages (IH) superimposed on a voltage waveform. Thesis is focused on the voltage fluctuation to lamps time-varying radiant flux and its spectral distribution fluctuation transfer analysis and on the utilization of the analysis results for development and realization of an objective flickermeter having response to both the temporal luminance and chromatic flicker. The thesis aim is the realization of the new flickermeter types implemented in LabVIEW, with the experimental verification. The thesis covers theoretical-analytical, developmental and also practical-experimental part of study. More information: drapela@feec.vutbr.cz.
Low power Induction motor as a special electric machines. Parameters, characteristics, application possibilities. Teoetická and experimental analysis engine. Design and verification of functional parameters on samples. Alternatives to the present motor.
Tutor: Hájek Vítězslav, prof. Ing., CSc.
Student will operate and utilize unique experimental facility being built at Department of Electrical Power Engineering of FEEC BUT. Facility is design for investigation of flow boiling crisis at medium-low pressure of light water. Objective of PhD research is to bring new informations about modified and innovative surfaces influence on boiling crisis parameters. Data will be crucial for safety analyses and accidental conditions analyses of pressurized and boiling water reactors. Research will be performed within cooperation with Faculty of Mechanical Engineering of BUT.
Tutor: Katovský Karel, doc. Ing., Ph.D.
Low-frequency EMC in LV/MV distribution systems highly penetrated by distributed nonlinear, dynamic and parametric loads.
The theme is focused on the research and development of autonomous luminaires supplied from local renewable sources. Although these luminaires are already commercially available, their prevalence is minimal. Yet there is a considerable potential both for public lighting and in industrial, commercial buildings and public buildings. With advanced technology light sources based on LEDs and new optical systems can now handle very precise light distribution with high efficiency light transmission while minimizing energy consumption. In the context of student work will analyze the potential of available renewable resources within selected locations, the possibility of conversion into electrical energy, the efficient accumulation and optimal conversion to light. Is calculated using motion detectors, illumination intensity, or. prediction of the availability of renewable resources in conjunction with simulation programs for the weather forecast. This can help prevent depletion of stored energy in the case of such a long-term shortage. Sunshine without increasing the storage capacity of the battery. Another potential area of research could be the ability of cooperation of these lamps in small networks that enables the sharing of stored energy, ie installed capacity batteries.
The work will be focused on problematics of proper synchronization of electroporation pulses with ECG signal. The theoretical part will deal with application of advanced signal analysis methods for identification of individual phases of the cardiac rhythm for the purpose of determination of a proper instant for the application of the electroporation pulse. In the practical part, a design of a control unit for the existing high voltage electroporation supply, which was already used for clinical tests in conjunction with the University Hospital Brno and the International Clinical Research Center (FNUSA-ICRC), will be realized.
Tutor: Červinka Dalibor, Ing., Ph.D.
The topic is aimed at the analysis of present method for testing of insulation of devices for 110 kV and 22 kV distribution networks. The solver will deal with insulation testing methodology under electric stress of high ac, dc and impulse voltages in test laboratories, dry and wet tests, pollution test, corona and voltage distribution tests on insulators. With respect of this tests the measurement of insulation resistance, dielectric response analysis, recovery voltage, capacitance and tan, partial discharges, must be analyzed as well. This work assumes introduction to relevant national and international standards for above mentioned tests, which the technical project of HV laboratory should be based on.
A pulsed high voltage power supply for the purpose of electroporation of cancer cells was developed at BUT FEEC. This device was already used for clinical tests in conjunction with the University hospital Brno and the International Clinical Research Center (FNUSA-ICRC). The work will be focused on design of a method for preliminary determination of reversible and irreversible electroporation regions, in relation to shape and positioning of application electrodes. The theoretical part will deal with determination of conductivity model of tissue, which will then be used for the simulation of electric field intensity distribution and approximation of ablation region. The practical part will be focused on visualization methods.
The thermal plasma is being widely technologically employed. One of the possible plasma sources is the plasma torch. It produces the plasma by means of axially blasted electrical arc. The aim of this work is to suggest mathematical-physical model of arc and to compare with simplified model. The values measured on plasma torch will be used for verification of the created model.
Tutor: Lázničková Ilona, doc. Ing., Ph.D.
The main aim of the thesis is design of the new concept of lightning and switching surge protection of generators, motors, transformers and decompensation coils in distribution networks.
Tutor: Toman Petr, prof. Ing., Ph.D.
Stability of electric power supply is - as a term - closely related with electrical energy production gained from renewable power sources (mainly from wind and photovoltaic power plants). The research will be focused on possibilities of accumulation of electric energy produced from renewable power sources with the help of modern technologies while focusing on hydrogen (VRB systems) utilization and pumped storage hydro plants for its accumulation. The result of the work will be the draft measures in the energy system, which can solve time disproportion between electrical energy supply and take-off from the renewable power sources. The solution is connected with computer simulation (Matlab) and experimental measuring on a real model.
The dissertation will be focused on research of a new approach for evaluation of safety criteria of earthing systems base on calculation and evaluation of probability of ventricular fibrillation of persons located in the evaluated earthing system area. The methodology will be based on both already applied, and new approaches optimized not only for national but also for international distribution networks operation conditions. The topic of the dissertation encompasses several areas that are focused on calculating the earth fault levels, fault duration and frequency of fault presence, as well as area focused on calculation and analysis of the potential distribution on surface for evaluation of possible levels of touch and step voltages, transferred potential to low-voltage earthing systems and also assessment of the probability of human touch presence and touch and fault coincidence.
Solution of energy balance in an arc plasma with respect to the radiative heat transfer. Influence of various spectral intervals and various molecular species on the radiative heat transfer in the arc plasma. Development of computer code for calculation of absorption coefficients of given thermal plasmas.
Tutor: Aubrecht Vladimír, prof. RNDr., CSc.
The theme is focused on solving one of the key issues in contemporary energy that is electrical energy storage technology. It offers the potential is currently a fast growing electromobility. Use of electric cars as energy storage, while not a new idea, but it is not yet known and widespread practical applications, which should detail the whole concept worked. Students should study carried out in the framework of the existing search solution developed by electric vehicle simulation model and could work with a real prototype electric car that provides a real measurement data and operation. The objective is to verify the idea of using the storage battery for other purposes, in addition to power traction drive car. Further define the conditions of how such practical applications looked, and possibly a demonstration operational testing and data collection with their evaluation. There is also the use of data from electric BUT Skoda Superb.
Research and development of a new generation of small and special motors with higher specification. The results will be proposals for functional prototypes and their verification.
The theme includes issues of sliding contact in high-end applications of electromechanical systems operating in dynamic operating conditions (Starting, regulation, etc.) with high ratings of current, voltage, speed, power, speed, and defined the parameters of the surrounding environment. Since the development of electromechanical systems in particular is currently associated with a requirement for high reliability and durability as defined, should be to extend the life of work sliding contact, reducing degradation of the stationary and moving parts of the sliding contact, eliminating the influence of the surroundings on the current flow between the stationary and moving part of the sliding contact. Partial information will be obtained during the analysis and field current.
Evaluate current options (worldwide) management and monitoring of building energy systems with renewable energy sources. Design and create a unified system of regulation and control for the system, which will include heat pumps, solar thermal collectors and hybrid energy system with accumulation (photovoltaics, wind turbines) in order to achieve the maximum possible interactions between different sources and devices with respect to environmental influences. Underlying assumption of the proposed system is based on the concept of using PLC.
Area of power systems grounding is one of the most important because of the safety of electrical networks in operational and fault conditions. Main aim of the thesis is to analyze the effect of the earthing system level model and soil characteristics on calculating the size of the potential rise in the size of the grounding system when operational and fault conditions.
The theme is focused on a depth analysis of the impact of light sources, luminaires and their controller on the environment. The main part should be the deal with the analysis of energy and environmental balance of light sources and luminaires in the production, operation and subsequent ecological disposal. The theme at this time when it is appropriate to rationalize energy, is gaining importance. The result should be the evaluation of individual components needed to produce lighting equipment from different perspectives (energy, environmental, etc.).
Tutor: Škoda Jan, Ing., Ph.D.
The aim is to create model of choosen electrical energy sources, which would demonstrate the relevant results in the evaluation of transients in electrical networks.
Integration of large scale renewable energy sources and small size generating facilities into the electricity structure will require new electricity grid structures and new strategies for their operation and control to ensure efficiency, security, sustainability, reliability and high quality power supplies. It can be assumed that the distribution networks will be addressed: • the change of power flow direction - protection of distribution networks will develop to become more similar to transmission systems, • new protection algorithms able to cope with the lower short circuit currents in the system because of the greater contribution of converter based generators, • new automation applications of DG connected to the distribution network - control capabilities, reconfiguration, synchronization and reclosing, • development of powerful communication networks in the distribution system with data integration based on the standard IEC 61850 communications, • reliable islanding detection and intentional islanding capability.
An increasing proportion of stochastic resources in networks affect the voltage stability during the day. Variable power delivery to the grid from these sources causes fluctuations in voltage variations during the daily diagram. Current devices used to the voltage regulation are unable to provide the required voltage level at all points of the network. The aim is to describe new possibilities and means for voltage regulation in distribution system and design concept of this regulation with regard to the current development of the resource base.
The power system reliability is high priority of present society. The main aim of the thesis is the analysis of present methods of condition evaluation of distribution network equipments and using the got information for fault detection in distribution networks. The example could be worse insulation state of transformers, grommets, single phase fault in line with covered conductors etc.
The aim is to define expected functionalities of the revenue meters and their integration to individual security-technical layers of a distribution system management, furthermore to optimize metering features and data concentration for individual tasks.
The theme is focused on the measurement and vibration analysis of electric machines. Specifically, the diagnostic spectrum measured vibration acceleration amplitudes and asynchronous motors. The main objective is to create a method based on neural networks, which has to recognize various types of failures of electrical machinery and enable their prediction.
Tutor: Janda Marcel, Ing., Ph.D.
The goal of the thesis is to theoretically and experimentally investigate Accident Tolerant Fuel. Student will calculate thermal conductivity influence of various additives in ceramic uranium matrix; simulate influence on neutronics characteristics of such nuclear fuel. Based on these analyses student will propose experimental verification of these predictions. Student will prepare innovated pellets and will experimentally study their properties. Student will evaluate benefit for industrial practice based on effective fuel utilization, fuel cycle economy, and mainly on nuclear safety.
The theme is focused on especially long-term tests for electrical machines, particularly with a sliding contact. The work builds on the extensive knowledge and skills in this area, which were obtained on UVEE FEEC the application of modern technology, not only in the design of electrical machines, but also sliding contact. The aim is to identify the dependencies and relationships between components, parameters in various design and technological design of machines linked eg EMC .. The problem is solved UVEE continuously and is achieved interesting results published on an international level. The Institute has a special measuring workplace for practical verification of theoretical assumptions and cooperates with leading companies not only in this country but also abroad.
This theme is focused on determining the uncertainties in photometry. Generally with every measurent, photometry included, it is necessary to evaluate the uncertainty of the result with which the measurement was taken. With the development of modern photometric measurement methods the question arises, how to evaluate the results, which depend on the number of degrees of freedom. An example may be the luminance analyzer based on CCD or CMOS sensors, automated measuring systems designed for directional spectral analysis of light sources and luminaires, or goniophotometer for measuring the near field. The task of the doctoral candidate should be in finding descriptions of the evaluation the measured results from the aforementioned and similar instruments and methodologies.
Doctoral thesis deals with design and realization of control for low power induction generator in application with fluctuating output power (typically for small hydro and wind plants). The thesis is focused mainly on design of control techniques of generator (eventually turbine) with respect to maximum output power. Advanced control techniques (fuzzy control, neural networks) should be employed.
Design and optimization of new methods of cooling of electric machines using modern computational methods and applications of several types of optimization methods with emphasis on genetic algorithms.
Electrical machines about power 350kW and 45 000 r.p.m are the aim of the research. That machines are supposed to be used for the drives of high speed turbocirculators of helium in fusion power stations. It will be necessary to provide carefull theoretical research including computer simulatuons. Carefull choice and measurement of material properties has to be provided because the machines with such parameters are in the edge of realization. Side effects usually neglected in the design of ordinary electric machines have to be taken into consideration. Special attention has to be done to mechanical problems as well.
Tutor: Ondrůšek Čestmír, doc. Ing., CSc.
The aim of the work is is the research and development of induction machine 200 kW, 20 00 r.p.m. for high speed high power dynamometer. The machine has to fullfil the requirements of wide speed range with high dynamics in motor and generator operation mode and with as high as possible efficiency. The machines supposed be realised and measured and theoretical results will be compared.
Conceptual solution of an island DC networks where resource base consists of hybrid energy system (photovoltaic, wind turbine, accumulation). The goal is to propose a technical solution of energy system enabling in case of lack/excess energy cooperation with AC network and simultaneously ensure the safe power to the object. The solutions will be also the design and testing of control and monitoring algorithm.