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

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

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.

doc. Dr. Ing. Miroslav Patočka

1. Alternative power sources in combined systems

   Regarding dynamic development of alternative power sources mutual cooperation of such sources is frequently aksed question nowadays. The aim of this disertation thesis is to design energy system compounded of more cooperating alternative power sources focusing on optimization of energy and economic balance. For veryfying hypothesis there is suggested usage of some simulation software and then compilation of physical analog.

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

2. Dispersed power production and its influence on reliability of supply

   Thesis is focused on the possibilities of connecting small power sources to the supply network and evaluation of its influence on the reliability of eletrical power supply regarding its flukiness. The thesis results in the design of system precautions and conditions for the operation of small power sources in supply network.

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

3. Modeling of the dispersed power generation influence on the grid power quality

   Power generation using renewable power sources and preferably at point of demand is certainly way to satisfaction of ever-increasing need for the environmental protection. Nevertheless, operation of such power generation units leads to physical-technical-economical problems like hardly specifiable power supply reliability, huge time irregularity of the power supply for example under varying climatic conditions, generation of distorted voltages, etc. Thesis is focused on modeling and simulation of the following type power units: combustion engine-induction generator, wind turbine-induction generator, Photovoltaic generator-power inverter, etc. The simulation should be performed for their connection to a representative low and middle voltage power grid, with evaluation of their influence on the voltage characteristic for each power grid node. Cumulative effect of the distributed power units over the power grid is significant as well. The problem is a part of research at Department of Electrical Power Engineering supported by the grant projects. More information: drapela@feec.vutbr.cz.

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

4. Protection against neutral conductor overloading and disconnection

   Topic is focused on the analysis of current and voltage system of a TN-type distribution network supplying star-connected asymmetrical nonlinear load. This case is typical for large majority of LV distribution networks with single-phase non-linear appliances. Under certain but usual conditions, described load-type connected to the three-phase network can cause overloading of the neutral conductor, leading in a worst case to its disconnection. High impedance of the neutral conductor together with the load unbalance i.a. leads to change in phase to neutral voltages magnitude up to the phase to phase voltage. Consequently, increased and at the same time decreased phase to neutral voltages can cause temporary or permanent change in function of the connected appliances. However, up to now there is no uniquely determined and effective tool to protect customer's networks against the neutral conductor overloading and its disconnection. The aim of the thesis is on the base of the analysis to propose function principle of an appropriate protection and to realize its prototype. More information: drapela@feec.vutbr.cz.

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

5. Radiation in thermal plasmas

   Solution of energy balance in an arc plasma with respect to the radiative heat transfer. Application of partial chcaracteristics method to various kinds of arc plasmas. The main goal is a prediction of radiation intensity in the arc plasma with given temperature profile together with an analysis of radatove heat transfer role in the energy balance. Other results will be computed radial temperature profiles and E-I curves for a wall-stabilized arc burning in various gases.

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

6. The influence of network asymmetry on the current during non-symmetrical faults

   The common method of fault calculation is based on condition that the generators and the lines are symmetrical. Real MV netwoks are not operated as transposed that means for sharp calculation there is not possible to suppose that they are symmetrical. The main aim of the work is the analysis of electrical values during different types of fault in non-symmetrical networks and evaluation of asymmetry influence on accuracy of calculation according standards.

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

7. Utilization of heat energy from solar systems for cooling

   Regarding realizations of solar systems there appears a problem with excess of thermal power during summer months period. The aim of the dissertation thesis is to compile and optimize solar system model with usage of thermal energy for cooling. Part of the thesis is also energy analysis of designed system altogether with economic point of view.

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