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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 161
Gundebommu, Sree Lakshmi , Rubanenko, Oleksandr , Rubanenko, Olena , Labzun, Mikhail
Dielectric properties analysis of paper capacitor

The film-impregnated dielectric under operating conditions is subject to prolonged exposure to electric and thermal fields, as well as mechanical loading. In addition to critical partial discharges, the most serious drawback that impairs the film and condenser reliability in general is the&#...

Gundebommu, Sree Lakshmi , Rubanenko, Oleksandr , Rubanenko, Olena , Hunko, Iryna
Research processes of oil and paper insulation of high-voltage equipment during operation

The article analyzes the factors that accelerate the aging process of the oil-paper insulation of the condenser type and shorten its service life. Attention is drawn to the fact that the breakdown of flat insulation made of condenser paper occurs at the location of the in...

Kalaj, Patrik , Čermák, Radek , Frank, Zdeněk , Kindl, Vladimír , Komrska, Tomáš , Laksar, Jan , Peroutka, Zdeněk
Measurement of the effects of higher harmonic injection on nine-phase induction motor

This paper deals with an experimental injection of harmonics to a stator winding of a nine-phase machine. Different combinations of the harmonic components are applied with the optimal magnitudes calculated by a linear programming to maximize exploitation of a magnetic circuit. The theo...

Laksar, Jan , Hruška, Karel , Veg, Lukáš
Analytical calculation of saturation effect on the operation maps of surface-mounted PMSM

Inductance variation with the load can have a significant effect on the operation and control of the machine and it should to be implemented in the analytic design of the machine. In this paper a magnetic equivalent circuit (MEC) method used for the analysis of the p...

Kalaj, Patrik , Peroutka, Zdeněk , Zeman, Karel , Byrtus, Miroslav
Modeling and optimal control of multi-winding permanent magnet synchronous motor

The main contribution of this paper is design of optimal field oriented (vector) control of a multi-winding permanent magnet synchronous motor. Three variants of vector control structures for the multi-winding synchronous motor are presented in the paper. Each of the presented vector co...

González Teodoro, Jorge Rafael , Kindl, Vladimír , Romero Cadaval, Enrique , Asensi, Rafael
Analysis of skin effect in single wire resistance by finite element methods

Efficiency of the power converters is an important specification that determines their success on the market, being the losses a critical part that influences greatly the operation capabilities of the converter. To analyse with the required precision, the losses of magnetic component, b...

Štork, Milan
Simple amplitude control and frequency correction of recursive sine wave digital oscillators

This work describes one of the possibilities of amplitude control in recursive sinusoidal digital oscillators with integer arithmetic. As in the case of analog oscillators, it is also necessary to control the amplitude of digital oscillators with a sine wave. If the amplitude is&#x...

Štork, Milan , Novák, Jaroslav
Characteristic of some physiological parameters based on bicycle and treadmill exercise testing

In this paper examines procedure for modelling of cardiac output and oxygen consumption as response to cardiopulmonary exercise on a treadmill or bicycle ergometer. The results are presented on 2 athletes - football player and country ski runner which undergone a several stress tes...

Gundebommu, Sree Lakshmi , Rubanenko, Olena , Divya, G. , Rubanenko, Oleksandr
Battery energy storage technologies for sustainable electric vehicles and grid applications

The energy consumption in worldwide has been increasing rapidly, due to increase in world population. This energy consumption growth is apparently impacting on the environment and the society. This has accelerated the development and deployment of Renewable Energy Sources (RES) harvesting te...

Suchý, Ondřej , Košan, Tomáš , Streit, Luboš
Implementation of control unit for electric drive kart

This paper presents the design of the control unit to be installed in the electric kart and it will control the permanent magnet synchronous motor as well as other peripherals. The control unit contains microcontroller TMS320F28335, analog circuits for voltage and current sensors, ...

Biswal, Pravat , Bhajana, V.V.Subrahman. Kumar , Drábek, Pavel
Novel soft-switching high gain transformerless DC-CD converters without auxiliary switches for renewable energy systems

This paper presents new soft-switching transformerless DC-DC converters without auxiliary switches. The soft-switching operation is achieved with the aid of simple resonant cell, which comprises of an inductor, a capacitor and a diode. In addition to the auxiliary cell, a voltage multiplier&...

Jamshidi, Mohammad , Roshani, Saeed , Roshani, Sobhan , Talla, Jakub
A compact low-pass filter with simple structure and sharp roll-off

In this paper a compact low pass filter (LPF) with desirable figure of merit (FOM) and sharp roll-off is designed. The cut-off frequency of the designed filter is 3 GHz. The designed filter has a sharp transition-band of 0.88 GHz, from 3 to 3.88 GHz with correspondin...

Jamshidi, Mohammad , Roshani, Saeed , Talla, Jakub , Roshani, Sobhan
Using an ANN approach to estimate output power and PAE of a modified class-F power amplifier

In this paper, an efficient Class-F power amplifier (PA) is designed, simulated and modeled. This type of amplifier has nonlinear behaviors and uses tuning and controlling harmonics as the most important mechanism to increase efficiency. Feedforward artificial neural network (ANN) model is&#...

Blahník, Vojtěch , Straka, Miloš , Pittermann, Martin
Application of power electronic converter for actual topologies AC traction substation

This paper describes the typical field of power electronic converter in the branch of traction substation. The main attention is paid to problematic of ACtraction substation. This topic is solved here due to the just started conversion from DC-traction system to AC traction system&...

Pavlíček, Vladimír , Fořt, Jiří , Pittermann, Martin , Skala, Bohumil
Comparing the low-cost measuring devices for standstill frequency response (SSFR) testing for electric machines

This paper compares the different versions of hardware realization of low-cost device for standstill frequency response SSFR testing. The SSFR testing is a modern method used for testing and parameter identification for electrical machines especially for synchronous machines (high power generator...

Blahník, Vojtěch , Straka, Miloš , Pittermann, Martin
Analysis of multilevel electronic balancer for AC traction substation with PS-PWM

The main goal of this paper is the analysis of an behavior for the electronic balancer of the AC traction substation. This balancer consists of three delta connected multilevel cascade H-bridge converters. The employed phase-shifted pulse width modulation causes the significant decrease ...

Georgiev, Vjačeslav , Vavroch, Ondřej , Zich, Jan , Nožka, Libor
Diagnostic device for photomultiplier tubes at ARP ToF detector

Long-term usage of photomultiplier tubes (PMTs) led to the discovery of aging effects especially in harsh environment as a radiation is. Aging decreases the efficiency of the PMTs. This means PMTs need to the recalibration after some time. Because CERN´s Large Hadron Collider (LHC)...

Blahník, Vojtěch , Straka, Miloš , Pittermann, Martin
Control of multilevel converter for AC traction substation with power symmetrization unit

This paper describes the control of multilevel converter for substation balancer. The topology of substation with electronic balancer is described. The principle of power symmetrization and reactive power compensation is introduced in paper. Designed control algorithm for independent current control&#...

Štork, Milan , Houzar, Josef
Non contact methods of heart rate variability measuring and analysis

It is well known that the heart rate variability (HRV) reflects the activity of the autonomic nervous system. HRV is calculated from heart rate (HR). HR is a nonstationary signal; its frequency variation may contain indicators of current disease, or warnings about impending cardiac...

Yanna, Venkata Subba Rao , Bhajana, V.V.Subrahman. Kumar , Drábek, Pavel , Popuri, Madhuchandra
A novel soft-switching bidirectional DC-CD converter for energy storage applications

In this paper, a soft-switching bidirectional DC-DC converter is proposed. In order to achieve softswitching conditions ZVS turn on / ZCS turn off, the auxiliary circuit including a switch, a capacitor, a diode and a small inductor are adapted to the bidirectional converter. T...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 161