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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 58
Noháč, Karel , Noháčová, Lucie , Mužík, Václav
Actual possibilities of open-source applications for analysis of power systems

The paper recapitulates the current state and the assumed near future view of the possibility using opensource free software for complex simulation analysis of power systems. The declared general properties and capabilities of significant representative current tools for modeling complex power&#x...

Komrska, Tomáš , Glasberger, Tomáš , Peroutka, Zdeněk
Minimum infinity norm-based PWM for three-phase four-leg converters

Control of four-leg voltage-source converters operating on three-phase systems traditionally faces the problem of transformation from a four-degrees of freedom (DOF) modulation space to a three-DOF output-voltage space. Contemporary, it is highly desirable to minimize the leg voltage, and consequently...

Bhajana, V.V.Subrahman. Kumar , Drábek, Pavel
Novel ZCS transformerless high gain DC-DC converters for renewable energy conversion systems

This paper proposes new zero current switching (ZCS) transformerless high gain DC-DC converters for renewable energy conversion systems. A conventional high gain transformerless DC-DC converters derived with a simple auxiliary resonant network to obtain zero current switching (ZCS) turn-off condition&...

Gevorkov, Levon , Šmídl, Václav , Sirový, Martin
Model of hybrid speed and throttle control for centrifugal pump system enhancement

A Simulink/DriveSize based model for the hybrid speed and throttle control of a centrifugal pumping plant equipped with a variable speed drive is proposed in this paper. The model provides the possibility of input power estimation for mutual throttling and speed control. In ad...

Totzauer, Pavel , Kúdelčík, Jozef , Hornak, Jaroslav , Michal, Ondřej , Trnka, Pavel , Mentlík, Václav
Analysis of particle size distribution and other parameters of nanoparticles in natural ester oil

In this article we tackle the main problem of nanoparticles which is aglomeration, sedimentation and their long term stability. It has been proved that the nanoparticles offer various benefits for improving the electrical parameters (like breakdown voltage, dissipation factor tan,etc.) of in...

Štěpánek, Jan , Bednář, Bedřich , Drábek, Pavel
Verification of the current load capacity of the MOSFET transistor for low-voltage application using temperature estimation

This paper deals with the verification of the maximum current rating of MOSFET transistors in a discrete package TO-247AC. The main motivation for this analysis was the redesign of AC power drive chain for electric go kart with three phase power converter of the output no...

Bednář, Bedřich , Drábek, Pavel , Pittermann, Martin
Implementation of FPGA and DSP combined algorithms for modular single-phase matrix converter with medium frequency transformer for traction drive application

The paper introduces basic characteristics of the traction drive and the way how modern multi-system traction vehicle can be realized. The main aim of the paper is focused on using single phase matrix converter (1ph MC) as an input converter for medium frequency transformer. T...

Kehl, Zdeněk , Glasberger, Tomáš , Peroutka, Zdeněk
Finite control set model predictive control of static compensator

Static Var Compensators (SVC) are related to improve quality of electrical energy in power grids. There are described two topologies of the static var compensator in the paper. First of them is a star/Y-connected topology and the second one is a delta/D-connected topology....

Streit, Luboš , Štěpánek, Jan , Komrska, Tomáš , Jára, Martin , Peroutka, Zdeněk
DC losses heatsink verification of IGBT converter for power systems

This paper deals with heatsink design and verification of IGBT-based full-bridge converter of rated power 150 kVA. The converter is designed for air cooling-based installation of total power 1.35 MVA operating in medium-voltage power system. In order to exactly determine the cooling abi...

Juřík, Martin , Kuthan, Jiří , Vlček, Jiří , Mach, František
Positioning uncertainty reduction of magnetically guided actuation on planar surfaces

Key design and operation parameters of the system for magnetically guided actuation of miniature robots on planar surfaces are analyzed and discussed. The study is carried out on the numerical analysis and also on the experimental measurement on the prototype of the system. Special...

Štork, Milan , Novák, Jaroslav , Brož, Pavel
Cardiac output estimation for marathon runners and its mathematical model

Cardiac output (CO) and stroke volume (SV) are important hemodynamic parameters for evaluation of cardiovascular performance of the subject. Especially noninvasive estimation of CO during sub maximal and maximal work is valuable. In this paper, one method suitable for athlete CO estimation&#...

Štork, Milan
Direct digital synthesis with fractional tuning

This paper presents a new approach to the design of direct digital frequency synthesizer (DDS) with possibility of fractional frequency tuning. Such DDS has advantage if small number of bits for phase accumulator is used. A new DDS frequency synthesizer was designed to enable ...

Štork, Milan
Experiments with coupled phase locked loops

In this paper the experiments with two or more mutually coupled phase locked loops (PLL) are described. The different types of coupled PLLs are simulated and results are confirmed by measuring in real systems. The experiments include analog and digital PLLs and simulation. In ...

Janouš, Štěpán , Košan, Tomáš , Talla, Jakub , Peroutka, Zdeněk
Improved accuracy of model predictive control of induction motor drive using FPGA

Finite control set model predictive control (FCS-MPC) is one of successful model predictive control approaches in electric drives which offers effective solution to multi variable multi criteria problems. The optimal control is found by “brute force” search over the limited set of possi...

Kroneisl, Michal , Šmídl, Václav , Peroutka, Zdeněk
Adaptation of predictive acoustic noise control of IM drive to variable operating conditions

Finite control set MPC of IM drive is known to produce a spread spectrum of the stator currents. Spectrum of the acoustic noise also exhibits higher spread than that of the PWM which may be perceived as more pleasant sound by humans. Predictive acoustic noise control ...

Taylor, Stephen , Brychcín, Tomáš
The representation of some phrases in Arabic word semantic vector spaces

Design of electrical machines with low carbon footprint is an actual topic in the industry. Total cost of ownership is the standardized methodology to consider the lifetime costs of a power transformer already in the pre-concept design stage. There still does not exist a widel...

Hruda, Lukáš , Dvořák, Jan , Váša, Libor
On evaluating consensus in RANSAC surface registration

The topic of the article is new insights into the load of transformers depending on their own losses. Transformers are among the most common, but important elements of the transmission and distribution networks. This is a reliable device with a guaranteed lifetime at the level...

Kučera, Lukáš , Peška, Jaroslav , Fojtík, Pavel , Barták, Petr , Kučerová, Pavla , Pavelka, Jaroslav , Komárková, Veronika , Beneš, Jaromír , Polcerová, Lenka , Králík, Miroslav , Bednář, Petr
First direct evidence of broomcorn millet (Panicum miliaceum) in Central Europe

Standard short circuit tests of HV SF6 circuit breakers need high power sources and special synthetic facilities. Tests consist of many standard disciplines. Each of short fault disciplines requires high parameters from high power sources. They also require exact measurement and accurately&#...

Jiřinec, Jakub , Rot, David
Measuring system for recuperation units

This paper is focused on modeling of existing cogeneration power plant with backpressure turbine in Pilsen. The first motivation of the modeling is better understanding of all cycle features and its limitations. The second motivation is further investigation of some innovative implementation...

Heigl, Michael , Schramm, Martin , Fiala, Dalibor
A Lightweight Quantum-Safe Security Concept for Wireless Sensor Network Communication

Operational direct current grids (ODCG) are one of the most important components of many power plants and substations, for example, hydroelectric power plants. They are designed for power supply of relay protection devices, signalization and automation, and for the power supply of impor...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 58