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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 396
Bělík, Milan , Tímr, Jan , Rubanenko, Olena
Prediction of the degradation process of mono-Si photovoltaic panels in Ukrainian and Czech conditions

This paper focuses on project studying the influence of various technical, meteorological, and specific local factors influencing power generation from photovoltaic plant. This problem is analysed on model PV plants installed in Ukraine and Czech Republic. The Fault tree analysis (FTA) metho...

Olkhovskiy, Mikhail , Müllerová, Eva , Martínek, Petr
Determination of the Optimal Reference Signal Frequency in the Task of Power Spectrum Pattern Classification

This article describes the results of an experiment in which a reference signal with its subsequent processing is used to obtain information on the degree of cable insulation degradation. A one-dimensional convolutional neural network is used for signal classification. The reference signal&#...

Hornak, Jaroslav , Trnka, Pavel , Prosr, Pavel , Michal, Ondřej , Kopřiva, Jiří
The Behavior of Cold-Curing Resin after Thermal and UV Radiation Exposures

Potting compounds are widely used in electrical engineering. One of the distinctive subgroups is the so-called cold-cure potting compounds. These potting compounds are mainly used for mechanical or photosensitive protection and are thus often exposed to extreme conditions due to their nature...

Dlouhý, Martin , Kotlan, Václav , Doležel, Ivo
Indirect induction hardening of thin electrically non-conductive layers

A model of indirect induction heating of very thin layers made of electrically non-conductive materials is presented. The model consists of two partial differential equations describing electromagnetic and temperature fields whose distributions are solved numerically. It is applicable for the des...

Kotlan, Václav , Hamar, Roman , Doležel, Ivo
Modeling of induction-assisted 3D laser printing

A mathematical model of induction-assisted 3D printing is presented, providing a tool for design of specified tracks printed on suitable substrates. The model consists of the non-stationary temperature field produced by laser beam and field of deformation produced by continuous adding the&#x...

Bělík, Milan , Kuchanskyy, Vladislav , Yuri, Lykhovyd , Rubanenko, Olena
Optimal Value Determining Method of Parameters Compensating Devices of Bulk Electric Networks

The given method of optimizing the modes of main electric networks allows obtaining a universal approach for solving such tasks as minimizing the total losses of active power and compensating excess flows of reactive power. The methodology for selecting the parameters of compensating&#x...

Lezhniuk, P. , Komar, V. , Rubanenko, Olena , Bělík, Milan , Rubanenko, O. , Smaglo, I.
Analysis of technical conditions influencing the operation of PV power stations cooperating with controlled power grids

The article shows in first part the need to assess the technical condition of photovoltaic power plants, in particular the degradation of their photovoltaic modules, because during operation there is a gradual decrease in the actual power generation if compared to the initial value...

Petrášová, Iveta , Karban, Pavel , Doležel, Ivo
Using Surrogate Model for Shape Optimization of Busbar

Methodology of shape optimization of the frequency converter blades, which are heated by Joule losses due to nonuniform current flow, is presented. For processing this coupled and nonlinear problem, its full mathematical model is replaced by a suitable equivalent model, on which the...

Dashtdar, Masoud , Belkhier, Youcef , Bajaj, Mohit , Sadegh, Seyed Mohammad , Bělík, Milan , Rubanenko, Olena
Protection of DC Microgrids Based on Frequency Domain Analysis using Fourier Transform

Due to the expansion of the use of distributed generation sources and especially renewable energy resources, the use of microgrids is increasing rapidly. The protection of DC microgrids is one of the most important challenges in the design and operation of this type of electri...

Bělík, Milan , Yuri, Lykhovyd , Kuchanskyy, Vladislav , Rubanenko, Olena
Phase Design and Wires Cross Section Justification of Extra High Voltage Line

The paper presents the results of the analysis of the economic curves of overhead power lines with subsequent justification of the design of the power line. In the paper, economic curves are constructed for a line with a rated voltage of 750 kV. The cross-sections, the&#x...

Dashtdar, Masoud , Bělík, Milan , Yadav, Arvind , Hosseinimoghadam, Seyed Mohammad Sadegh , Bajaj, Mohit , Rubanenko, Olena
Improving the Performance of Distance Relay-Based Artificial Neural Network

Distance relays for protection of power transmission lines used, which can be based on fixed stings Adjusted. But usually, the amplitude of operation of these relays changes with changing network conditions (network topology, load value, output value, etc.) and causes the relay to ...

Karban, Pavel , Petrášová, Iveta , Doležel, Ivo
The principle of prediction of complex time-dependent nonlinear problems using RNN

An approach based on recurrent neural networks (RNNs) is applied to verify the possibility of using surrogate models for the prediction of dynamic nonlinear problems. Modeling complex time dependencies is currently still a challenge, when the structure of the neural network needs to...

Sodomka, Ondřej , Skřivan, Vojtěch , Jozová, Kateřina , Mach, František
Magnetically Controlled Microfluidic Channels

A technological framework for entirely soft microfluidic channels controlled by an external magnetic is pro-posed. The crucial part of the channel is a multilayer structure compounded of a magnetorheological elastomer (MRE) and additional nonmagnetic layers that provide unique properties to the&#...

Šroubová, Lenka , Slobodník, Karel , Naxer, Ondřej , Blohmann, Miroslav
Adaptive Model of Battery System Behavior for Electromobility

The aim of this paper is to optimize comparative value predicting the remaining electric vehicle's range. The paper deals with the mathematical model for a typical battery system used in electro mobility, in accordance with the real operating parameters, actual battery state, track&...

Bělík, Milan , Rubanenko, Olena
Degradation of Monocrystalline PV Panels Differences between Ukrainian and Czech Conditions

The purpose of our research is to compare the influence of meteorological factors and technical conditions of PV plants on power generation. The issue is studied on PV plants in Ukraine and the Czech Republic. A method and model for assessing the technical condition of PV...

Šmucr, David , Vítek, Martin , Mach, František , Pospíšil, Karel
Non-contact Electromagnetic Actuator for a Ball Valve

The article deals with the issue of a fully electromagnetic non-contact actuator for a ball valve - a valve controlled by a purely electromagnetic field (direct drive) created by coils (electromagnets) placed outside the operating part of the valve.

Hromádka, Aleš , Martínek, Zbyněk , Sirový, Martin
Assessment of Typical Shutdowns in CHP Plant

This paper is focused on assessment of typical operational constraints at combined heat and power plant in Pilsen. The plant has been chosen because there have been operated various production technologies. All the technologies have been assessed by key availability parameters e.g., num...

Hromádka, Aleš , Martínek, Zbyněk
Shutdowns Assessment of Biomass Burned Unit

Shutdown assessment has been performed at the biomass burned unit in the CHP plant in Pilsen. The assessment has shown a state of operated production technologies and its average availability in investigated years for a further assessment. The assessment has also identified the sig...

Očenášek, Jiří , Bednář, Bedřich , Tyrpekl, Miroslav , Michalík, Jan , Košan, Tomáš
Design of Two-Channel LED Stand-Alone Solar Lamp Driver Prototype for Biodynamic Application

This paper deals with design of LED driver as a part of an efficient solar-powered streetlamp based on biodynamic lighting. The contribution of this paper is experimental verification of the designed solution in form of a fully functional battery powered SSLS prototype.

Skalický, Martin , Pechánek, Roman , Sobotka, Lukáš , Veg, Lukáš
Thermal Models of Various PMSM Rotor Topologies

This paper presents analytical thermal models of 7 different rotors with permanent magnets, which are used as sub-models in universal thermal management software, which is currently being developed at our university. Whole software is created as script in MATLAB interface and is based&#...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 396