Full-time study

4 years

prof. RNDr. Vladimír Aubrecht, CSc.

Chairman :
prof. RNDr. Vladimír Aubrecht, CSc.
Councillor internal :
doc. Ing. Petr Mastný, Ph.D.
prof. Ing. Jiří Drápela, Ph.D.
doc. Ing. Pavel Vorel, Ph.D.
doc. Ing. Ondřej Vítek, Ph.D.
prof. Ing. Petr Toman, Ph.D.
Councillor external :
prof. Ing. Radomír Goňo, Ph.D.
Ing. Petr Modlitba, CSc.
prof. Ing. Aleš Richter, CSc.
Ing. Zdeněk Wolf

The doctor study programme is devoted to the preparation of the high quality scientific and research specialists in various branches of power electronics, control technology, design of electrical machines, electric power generation and distribution, and electric power utilization.
The aim is to provide the doctor education in all these particular branches to students educated in university magister study, to make deeper their theoretical knowledge, to give them also requisite special knowledge and practical skills and to teach them methods of scientific work.

The goal of the postgradual doctoral (PhD) study of the program "Power Systems and Power Electronics" 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 university teachers and in higher manager functions as well.

The graduate of the doctor study program "Power Systems and Power Electronics" obtains broad knowledge of subject of high power engineering. The knowledge is built 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.

Doctoral studies are carried out according to the individual study plan, which is prepared by the supervisor in the beginning of the study in cooperation with the doctoral student. The individual curriculum specifies all the duties determined in accordance with the BUT Study and Examination Rules, which the doctoral student must fulfill to successfully finish his studies. These responsibilities are time-bound throughout the study period, they are scored and fixed at fixed deadlines.
Students will write and pass tests of obligatory subject Exam in English before the state doctoral examination, compulsory elective courses in view of the focus of his dissertation, whereas at least two are selected from: Mathematical Modelling of Electrical Power Systems, New Trends and Technologies in Power System Generation, Selected problems from power electronics and electrical drives, Topical Issues of Electrical Machines and Apparatus), and at least two optional subjects (English for PhD students; Quoting in Scientific Practice; Resolving Innovation Assignments; Scientific Publishing from A to Z).
The student may enroll for the state doctoral exam only after all the tests prescribed by his / her individual study plan have been completed. Before the state doctoral exam, the student draws up a dissertation thesis describing in detail the aims of the thesis, a thorough evaluation of the state of knowledge in the area of the dissertation solved, or the characteristics of the methods it intends to apply in the solution.
The defense of the controversy that is opposed is part of the state doctoral exam. In the next part of the exam, the student must demonstrate deep theoretical and practical knowledge in the field of electrical engineering, electronics, electrical machines, and electrical apparatus. The state doctoral examination is in oral form and, in addition to the discussion on the dissertation thesis, it also consists of thematic areas related to compulsory and compulsory elective subjects.
To defend the dissertation, the student reports after the state doctoral examination and after fulfilling conditions for termination, such as participation in teaching, scientific and professional activity (creative activity) and at least a monthly study or work placement at a foreign institution or participation in an international creative project.

The doctoral studies of a student follow the Individual Study Plan (ISP), which is defined by the supervisor and the student at the beginning of the study period. The ISP is obligatory for the student, and specifies all duties being consistent with the Study and Examination Rules of BUT, which the student must successfully fulfill by the end of the study period. The duties are distributed throughout the whole study period, scored by credits/points and checked in defined dates. The current point evaluation of all activities of the student is summarized in the “Total point rating of doctoral student” document and is part of the ISP. At the beginning of the next study year the supervisor highlights eventual changes in ISP. By October, 15 of each study year the student submits the printed and signed ISP to Science Department of the faculty to check and archive.
Within the first four semesters the student passes the exams of compulsory, optional-specialized and/or optional-general courses to fulfill the score limit in Study area, and concurrently the student significantly deals with the study and analysis of the knowledge specific for the field defined by the dissertation thesis theme and also continuously deals with publishing these observations and own results. In the follow-up semesters the student focuses already more to the research and development that is linked to the dissertation thesis topic and to publishing the reached results and compilation of the dissertation thesis.
By the end of the second year of studies the student passes the Doctor State Exam, where the student proves the wide overview and deep knowledge in the field linked to the dissertation thesis topic. The student must apply for this exam by April, 30 in the second year of studies. Before the Doctor State Exam the student must successfully pass the exam from English language course.
In the third and fourth year of studies the student deals with the required research activities, publishes the reached results and compiles the dissertation thesis. As part of the study duties is also completing a study period at an abroad institution or participation on an international research project with results being published or presented in abroad or another form of direct participation of the student on an international cooperation activity, which must be proved by the date of submitting the dissertation thesis.
By the end of the winter term in the fourth year of study the students submit the elaborated dissertation thesis to the supervisor, who scores this elaborate. The final dissertation thesis is expected to be submitted by the student by the end of the fourth year of studies.
In full-time study form, during the study period the student is obliged to pass a pedagogical practice, i.e. participate in the education process. The participation of the student in the pedagogical activities is part of his/her research preparations. By the pedagogical practice the student gains experience in passing the knowledge and improves the presentation skills. The pedagogical practice load (exercises, laboratories, project supervision etc.) of the student is specified by the head of the department based on the agreement with the student’s supervisor. The duty of pedagogical practice does not apply to students-payers and combined study program students. The involvement of the student in the education process within the pedagogical practice is confirmed by the supervisor in the Information System of the university.

1. Alternative Energy Systems in Concept of Sustainability

   The topic focuses on energy systems that offer high sustainability potential. Energy generation will continue to be the focus of modern society and with the advances in technology, it is clear that the current concept will need to be significantly modified towards renewable sources. However, the renewability of the resource is not the only condition. Future technologies will necessarily be developed with a view to material renewability and very low maintenance. However, it is not possible to rely solely on already produced technologies such as wind or photovoltaic power plants. Biomass, for example, offers great potential, but not in the form of direct combustion but using biodegradation processes. Resonant technologies based on the optimisation of energy flow and minimisation of transmission losses seem to be a very interesting and not yet scientifically explored area. This is not only electromagnetic resonance, but also mechanical resonance, even at the molecular or atomic level. A significant part of the work should therefore be devoted to the shape arrangement of the energy device and its influence on the resulting parameters. In this part the greatest experimental contribution of the work is expected. The direction of the work will be decided after a thorough search of existing perspective technologies.

   Tutor: Baxant Petr, doc. Ing., Ph.D.

2. Analysis of the reactive power overflows in distribution network and proposals of related measures for the implementation of renewable sources and electromobility

   - to analyse the planned development of distribution networks (related legislation and strategic documents, technical concepts of distribution networks, penetration rates of RES and electromobility, The European Green Deal, Fit for 55, etc.), - to analyse the current state of reactive power flows/overflows in the distribution and transmission system (through individual voltage levels of distribution network and in substations between distribution and transmission network), to identify and to define both problematic areas and the technical context in terms of reactive power flows, - definition of scenarios for the implementation of RES and electromobility at the level of the selected voltage level (incl. specification of technical criteria / implementation limits) for related analysis of implementation impact of RES/electromobility on reactive power flows/identification of possible available potential for reactive power flow management, - design of distribution network model (respecting e.g. network parameters/concept based on distribution system operator input data, RES/electromobility regulation requirements, stochastic methods for parametrization of consumer behaviour, voltage asymmetry in distribution network etc.) and to make comprehensive analysis of defined scenarios - R&D of measures for individual scenarios of implementation of RES/electromobility, the impact on voltage quality, active and reactive power flows, power system stability, specification of technical recommendations for distribution system operator, etc. An intership at a foreign research institution, for instance TU Graz, is expected. For more information email to: ptacekm@vut.cz

   Tutor: Ptáček Michal, Ing., Ph.D.

3. Centralized protection systems

   Centralized protection system is based on the monitoring of currents and voltages in distribution network through modern transducers with digitized outputs in accordance with the Sampled Values (SV) protocol according to IEC 61850-9-2. The work is focused on research of new protective features built on the possibility of these converters (high linearity and accuracy measurement, dynamic correction of measured values) as well as the concentration measured variables in one place (Process Bus). Its aim is to program functional application for monitoring and protecting specific part of distribution network that will use advanced protection algorithms and completely new functionalities for centralized systems of protection, control and optimization of power systems. The theme of this work cover besides power systems also information technology. Knowledge of computer networks, development of realtime applications and design of user interfaces for data presentation will be applied. Therefore, this work is recommended to candidates who have completed the information technology studies.

   Tutor: Orságová Jaroslava, doc. Ing., Ph.D.

4. Complex Lighting Systems in Sustainable Concept

   Lighting technology is experiencing another tumultuous period of development as we have very efficient light sources, very sophisticated control technology and the technology to develop virtually any luminaire. The seemingly well-studied area of the physiology of visual perception is now being significantly expanded by discoveries in the field of the effects of light on humans, namely in the area of biological processes. The influence of light has been demonstrated down to the molecular level and this important fact cannot be ignored in future technologies. At the same time, however, there is extreme pressure to save energy and find ways to reduce the energy consumption of buildings, which does not avoid lighting technology. The topic of the PhD thesis will therefore address these seemingly contradictory requirements and look for ways to meet both requirements simultaneously. Lighting technologies will have to respect not only energy, but also material and environmental issues. These aspects will also be addressed in the work. The result of the work should be a new vision for lighting technology that motivates manufacturers and users to focus on long-term solutions rather than short-term economic ones.

   Tutor: Baxant Petr, doc. Ing., Ph.D.

5. Constrained models of electric machines

   The doctoral thesis is focused on constrained modeling of electric machines, i.e., construction of analytical models including electrical, magnetic, mechanical and thermal effects in the machine.

   Tutor: Cipín Radoslav, doc. Ing., Ph.D.

6. Design and development of alternative partial discharge meters and indicators for high voltage equipment

   - Carry out an analysis and search of current principles and alternative solution of partial discharge measurement, - find suitable solutions or a combination of sensors on the basis of sensitivity measurement, determination of the nature of the fault, detection of the fault location and complexity of the solution, - implement own design and laboratory verification of functionality and range of parameters in shielded cells, - implement own, especially alternative principles of partial discharges measurement to indicators and fault meters in HV equipment.

   Tutor: Krbal Michal, Ing., Ph.D.

7. Development of methodology for certification of power generating modules with inverters

   With the growing number of small sources of electricity connected to low-voltage networks, due to the lack of detailed standardization, inverters connected to one outgoing line may undesirably interact each other, or may have an undesirable effect on the distribution network. The aim of the work is to design a comprehensive methodology, which will be based on the following sub-objectives: • analysis of related regulations and standards with requirements for properties and functions of power generating modules, • definition of procedures and parameter specifications for performing certification / verification tests, including virtual testing options, • specification and design of hardware requirements for inverters with implementation of hardware-in-loop testing in operating conditions • creation of methodology for processing and evaluation of operational data of ppower generating modules/equipment, • implementation of the proposed procedures and methodologies into certification processes in the Czech Republic, including the solution of a system for the automation of performed tests

   Tutor: Morávek Jan, Ing., Ph.D.

8. Fault diagnosis of electrical machines

   This topic is focused on research of fault diagnosis of electrical machines using different kinds of diagnostic signal, signal processing and decision making.

   Tutor: Vítek Ondřej, doc. Ing., Ph.D.

9. Charging stations for electric vehicles as an element of electricity system

   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. The condition for successful defense of this work is to complete at least one month long internship at a foreign university.

   Tutor: Mastný Petr, doc. Ing., Ph.D.

10. Chromatic temporal flicker

    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. An intership at a foreign research institution is expected (TU Dresden). More information: drapela@vut.cz.

    Tutor: Drápela Jiří, prof. Ing., Ph.D.

11. Integrated Glare Metric for Various Lighting Applications

    Glare is a negative state of human vision that causes not only unpleasant feeling but also have negative influence on the performance of human vision system. For the glare evaluation there are many equations that are always used for specific application. For interior lighting systems it is used metric UGR. For glare evaluation caused by daylight from windows it is used metric DGP, DGI etc. However, there are disadvantages of these metrics. They are adapted for specific type of lighting system (e.g. offices, sport grounds, street lighting etc.) and specified for typical luminaires (e.g. luminaires with fluorescent lamps and opal diffusor, daylight windows etc.) However, they are all based on empirical data and therefore not on the physiological and psychological model. From this reason it is not possible to use these metrics to new aplications. This problem occurs especially in the current situation, where LED technologies started to dominate the market. The LEDs radiate from the very small surface and with the specific spectrum. The task of this thesis is to partially find answer to question: “What is the physiological and psychological mechanism that is responsible for unpleasant feelings caused by higher luminance”. On the basis of this mechanism the model of discomfort glare caused by high contrasts should be carried out. This model should be generalized and used in lighting systems. This topic is highly supported by international commission for illumination CIE and it is classed within the 10 strategic research goals in lighting technology.

    Tutor: Škoda Jan, Ing., Ph.D.

12. Integration of energy communities into the existing distribution system concept

    European energy and climate legislation declares new roles and new mechanisms for the functioning of the energy sector, with an emphasis on active involvement and protection of consumers in providing for their own energy needs. In the Czech environment, the existing models and business relations of energy market actors do not fully comply with the requirements and regulations. One of the key areas brought about by the new regulations is the possibility of developing so-called energy communities as a tool for the necessary energy transformation. These entities will bring economic, social and environmental benefits at both local and national level. The aim of the study topic is to research and develop effective technical and organizational frameworks for the establishment of energy community projects in the conditions of the Czech Republic. Furthermore, to provide professional (technical, economic) input to the ongoing discourse on the possibilities of energy decentralization. Outline: - Analysis of existing possibilities and regulations for the establishment of energy communities in the Czech Republic, - Analysis of the technical integration of community associations into current realities, - Methodology of technical solutions for the operation of communities, - Design of measures for a proper distribution of roles (responsibilities) within the communities, - Economic underpinning of calculations for the correct sizing of energy communities.

    Tutor: Radil Lukáš, Ing., Ph.D.

13. Islanding operation of distribution systems with distributed generation

    The aim is to develop technically correct, reliable and verified concept for islanding operation (IO) of dedicated part of distribution system with distributed generation dealing mainly with definitions of conditions necessary to successful transition to IO, correct and reliable detection of conditions for transition to IP and back to parallel operation, development of power sources (loads) control strategy, etc. An intership at a foreign research institution, for instance Università degli Studi della Campania "Luigi Vanvitelli", is expected. For more information email to: drapela@feec.vutbr.cz.

    Tutor: Drápela Jiří, prof. Ing., Ph.D.

14. Modern methods of electrical machine parameter estimation

    The doctoral thesis is focused on analyzing the possibilities of electrical machine parameter estimation in various operating modes with a focus on asynchronous motors. The results will be used to construct accurate mathematical models, which also will be used in the design of modern control structures, e.g. predictive control.

    Tutor: Cipín Radoslav, doc. Ing., Ph.D.

15. Optical diagnostics of electric arc

    Evaluation of electric arc temperature and particle density using optical emission spectroscopy. High speed camera imaging of an arc discharge channel. Characterization of construction materials diffusion into discharge volume and its influence on the electric arc properties. An internship on the INP Greifswald is mandatory during this doctoral study. The minimal internship length is one month.

    Tutor: Aubrecht Vladimír, prof. RNDr., CSc.

16. Optimization of plasma radiation transfer calculations

    Calculation of optimal band distribution for mean absorption coefficients. Evaluation of the electric arc configuration and plasma composition on frequency band boundaries. Comparison of different numerical optimization algorithms and their application to the problem of radiative heat transfer in plasma. An international internship is mandatory during the doctoral study. Expected place of internship is LAPLACE laboratory of the University of Toulouse.

    Tutor: Aubrecht Vladimír, prof. RNDr., CSc.

17. Primary and secondary battery parameter estimation

    The doctoral thesis is focused on analyzing the possibilities of primary and secondary battery parameter estimations. Designed estimation algorithms will be used in analyzing operation modes of various battery-powered electric drives and electric tools. Ph.D. student has to absolve an internship at a foreign university with a minimum length of one month.

    Tutor: Cipín Radoslav, doc. Ing., Ph.D.

18. Probabilistic approach for optimization of distribution system operation

    The dissertation will be focused on research of a new probabilistic approach for evaluation of optimal operation of distribution network based on calculation and evaluation of fatal probability, probability of faults and continuity of supply. The methodology will respect 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 i.e. calculating of the earth fault levels, evaluating of fault duration and frequency, 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, fault ignition and touch/fault coincidence. The condition for successful defense of this work is to complete at least one month long internship at a foreign university. At present, university of TU Graz (Austria) may be considered relevant, but the specific place will be updated during Ph.D. study period.

    Tutor: Topolánek David, doc. Ing., Ph.D.

19. Real-time simulation utilization for advanced protection systems design

    New technologies of power system behavior research during transient phenomena open the area of advanced analysis focused to large protection systems operation during faults. The main aim of this dissertation is to extend possibilities of real time simulator RTDS about simultaneous tests in real time including real devices – hardware in the loop simulation. An internship at foreign university is included.

    Tutor: Toman Petr, prof. Ing., Ph.D.

20. Revision of current and proposal of novel calculation tool for earthing systems applicable for Czech national circumstances

    Over the past few years there has been a persistent pursuit of national power utility companies to improve the current state of earthing system calculation especially for cases with stratified soil structures. The currently widely used approach based on simple analytical formulas based on image method and with using mutual coefficients leads to complex dependencies and seems as quite unsuitable to be extended for such complex soil structures. There have been some attempts to improve the national utility standard that is being used by the utility companies for calculation of earthing systems, however, the current solution still seems as unsatisfactory. The possible way of improving the current situation can be seen in developing some kind of calculation software tool that could be referenced by the national utility standards as an alternative approach to the current practice and would be helpful especially for cases with worse soil structures. It is expected that the solution from such a software tool would be based on some more appropriate methods like solution of Laplace equation, method of finite elements etc. It would be further beneficiary to extend the tool capabilities by including the probabilistic approach of earthing system evaluation. Although this probabilistic approach is yet rather experimental, it can be expected that it will be allowed in the future as a complimentary to the state of the art deterministic approach. The bullet-points of this work can be expected as follows: - Analysis of currently used calculation and measurement procedures, the calculation requirements by the electrical utility companies. The analysis should be both on national and international (European) level. - Analysis and selection of adequate calculation method, selection of necessary input parameters. Analysis of appropriateness of selected solution and proposal of some improvements – recommendation on soil modelling, reinforced concrete earthing system modelling. - Cooperation with utility companies on verification of calculated results, carrying out necessary verification measurements etc. - Study possibilities of implementing probability evaluation of earthing systems.

    Tutor: Vyčítal Václav, Ing., Ph.D.

21. System for distribution network operation optimization

    The Ph.D. thesis is focused on the development of adaptive system for optimization of the low and medium voltage network operation with respect to: voltage level, reactive power flows, voltage unbalance, load flow, etc. The system itself will also ensure fault location inside such networks and automatic reconfiguration. Designed system will be utilizing information from monitoring and control devices that are intended for installation in the distribution system by the operator (smartmetering, reclosers, smart DTS, etc.). To fulfill this task, a solution based on an opensource platform will be used, which will not exclude the integration of the proposed solution into dispatching control and planning systems in the future. The condition for successful defense of this work is to complete at least one month long internship at a foreign university. At present, the Aalto University (Finland) may be considered relevant, but the specific place will be updated during Ph.D. study period.

    Tutor: Topolánek David, doc. Ing., Ph.D.

22. The voltage regulation in distribution networks with a high proportion of stochastic sources

    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 condition for successful defense of this work is to complete at least one month long internship at a foreign university.

    Tutor: Mastný Petr, doc. Ing., Ph.D.

23. Use of accumulation to support the energy system

    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, accumulators based on Lithium 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 condition for successful defense of this work is to complete at least one month long internship at a foreign university.

    Tutor: Mastný Petr, doc. Ing., Ph.D.

24. Utilization of advanced revenue meters for distribution systems control and automation

    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. An intership at a foreign research institution, for instance TU Dresden, DE, is expected. For more information email to: drapela@feec.vutbr.cz.

    Tutor: Drápela Jiří, prof. Ing., Ph.D.

1. round (applications submitted from 01.04.2022 to 15.05.2022)

1. Adaptive earth fault protection for compensated networks

   Currently, earth directional protections are used in compensated networks to determine the feeder affected by an earth fault. Their operation is usually linked to the automatic connection of the auxiliary resistor and consists only in signalling the faulty outlet, after which it is usually necessary to define the faulty line section in the signalled outlet. This procedure is based on the assumption that the residual current of the earth fault at the fault location does not exceed the permissible value and cannot cause the occurrence of danger contact/step voltages at this location. This also fulfils the condition for safe operation of the compensated network. However, with the increasing proportion of power cables in current compensated networks, compliance with this safety condition - i.e. the permitted residual earth fault current - can be very problematic, especially in situations where it is necessary to interfere with the topology of the network in order to maintain the continuity of the power supply and thus change its total earth capacitive current. In these situations, if an earth fault occurs, neither the permissible residual current limit of the ground connection nor the safety at the point of failure can be reliably guaranteed. In these cases, it is necessary to ensure that the earth fault is disconnected quickly. The work will therefore deal with the research, design and verification of a completely new concept of earth fault protection, which will be able to adapt to changes in the layout and topology of the distribution network leading to changes in the value of the residual current of the earth fault. On the basis of detected changes in the system or on the basis of the estimation of the residual current of the system, it will adapt its set-up in such a way as to exclude danger to persons and animals in the vicinity of the fault and therefore in a place with a dangerous ground potential.

   Tutor: Orságová Jaroslava, doc. Ing., Ph.D.

2. Development of advanced models for rapid analysis and multidisciplinary optimization of induction machines

   There are many electrical machines used in industry today, and by far the most widely used are squirrel cage induction machines. Optimizing and further improving these types of machines, has great potential for realizing significant energy savings. To address this fact, the proposed topic aims to developing and implementing advanced reduced-order models for squirrel cage induction machines for their fast transient analysis and optimization. It is expected that the developed methods will be applied for optimization of these types of machines and their cooling methods to achieve maximum efficiency and power density. It is expected that the results will be regularly published at conferences and in high-level journals. Within this topic, the opportunity will also be provided to consult the research and development results with the staff of the JKU - Johannes Kepler Universität Linz, Institut für Elektrische Antriebe und Leistungselektronik, where a compulsory Ph.D. student internship abroad is also expected.

   Tutor: Vítek Ondřej, doc. Ing., Ph.D.

3. Optimization of DC/DC converters to achieve maximum efficiency

   The focus of the theoretical part of this work will be searching for analytical equations for an exact calculation of significant losses in a chosen progressive DC/DC converter with transformer in dependence on parameters like switching frequency, current ripple, transformer flux density, core and winding geometry (transformer and choke) taking into account skin-effect and proximity effect. Some of these equations can be found directly, but some others have to be found as analytic approximation functions of simulated or measured dependencies. These measurements and simulations will be a part of this work. After obtaining all the equations an analytical search for the local minimum of the sum of all losses at chosen criteria conditions will be performed. These analytical calculations will be compared to a numerical solution. The focus of the practical part will be a construction of the chosen converter to verify the obtained theoretical results.

   Tutor: Vorel Pavel, doc. Ing., Ph.D.