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Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 23
Komrska, Tomáš , Glasberger, Tomáš
Pulse width modulation of three phase inverters based on linear programming

Traditional three-phase voltage-source inverters supplied by constant dc-link voltage usually utilize the space vector PWM to achieve maximum output voltage. This paper deals with optimization of inverter leg voltages using linear programming method. System definition is based on the relationship ...

Dragoun, Jaroslav , Talla, Jakub , Košan, Tomáš
Converter Power Losses Computation by FPGA-based HIL Simulator : Invited Paper

Converter losses play a crucial role in the process of power converter design. Especially semiconductor components and heat sink selection are strongly dependent on the total power converter losses and thus affect the power converter size and its price. The most popular techniques ...

Bhajana, V.V.Subrahmanya Kumar , Drábek, Pavel
A Novel ZCS/ZVS Bidirectional DC-DC Converter for Energy Storage Applications

In this paper, a new soft-switched non-isolated bidirectional converter is proposed. This proposed converter is operated with soft-switching (zero current switching / zero voltage switching). It is implemented during the turn-on of main switching devices, with the addition of auxiliary reson...

Kehl, Zdeněk , Glasberger, Tomáš
Analysis of three-level neutral point piloted power converter topology

This paper deals with three-level topology of neutral point piloted converters (3L-NPP). These converters can be realized in two variants. The first one is represented by one power semiconductor switch only placed in the top and bottom part of an output leg of a half brid...

Kroneisl, Michal
Measurement and evaluation of electromagnetic noise

This paper deals with measurement and evaluation of electromagnetic noise generated by induction electric motor fed by inverter controlled by PWM. It suggests and describes possible method of evaluation the electromagnetic noise which can be used in real-time applications.

Bláha, Štěpán , Komrska, Tomáš , Šmídl, Václav , Glasbergerová, Vendula , Peroutka, Zdeněk
Multi-harmonic LQ control of single-phase converter with LCL filter

Control of single-phase converters connected to the grid via an LCL filter is a demanding issue due to risk of oscillations. A linear-quadratic (LQ) controller enabling besides standard pure sine control also a multi-harmonic current reference is proposed in the paper. Such a desig...

Kindl, Vladimír , Byrtus, Miroslav , Skala, Bohumil , Kůs, Václav
Key assembling issues relating to mechanical vibration of fabricated rotor of large induction machines

In many applications, where rotating machines of high power are used, high demands on reliability and safety are laid. Precise manufacturing procedures has to be kept even in case of machines retrofits when e.g. rotors are newly assembled. Even small inaccuracies or misguiding the&...

Franc, Jiří , Pechánek, Roman , Kindl, Vladimír , Zavřel, Martin
Ventilation system with skewed rotor cooling ducts of 40-MW synchronous machine: a case study

This paper describes modified ventilation system and thermal analysis of low-power 40-MW turbo generator. The study compares thermal behaviour of the machine for three different arrangements of the rotor ventilation ducts. Variations of both the sub-slot and the radial ducts are analysed.&#x...

Streit, Luboš , Talla, Jakub , Janda, Martin
Tram LC filter stabilization by Energy Storage system

The paper is focused on the tram input LC traction filter stabilization by the Energy Storage System. The input LC filter is almost undamped resonant circuit which is mainly excited by the motor constant torque command. The tram during voltage drops increases the current flow&...

Blahník, Vojtěch , Košan, Tomáš , Peroutka, Zdeněk , Talla, Jakub
Control of AC/DC modular multilevel converter

In recent years, a special attention is paid to grid connected multilevel converters. These converters have specific use in industry in a high power, medium-voltage and high-voltage applications. This paper presents new control algorithm for single-phase AC/DC modular multilevel converter wi...

Danzer, Jiří
LOW - frequency currents in intermediate DC circuit of voltage inverter

Krasl, Milan
Influence of temperature on operation characteristics of electrical machine with permanent magnets

Krasl, Milan
Indirect frequency converter for the supply of the rotor of the asynchronous motor

Pitterman, Martin , Fořt, Jiří
Finite element method analysis of electromagnetic field inside pulsed power generator

Skala, Bohumil
Acceleration sensor based on the ferraris principle for rotary drives

Mach, František , Kůs, Pavel , Karban, Pavel , Doležel, Ivo
Mathematical modelling of direct current corona discharge problems in air

Mach, František , Karban, Pavel , Kůs, Pavel , Korous, Lukáš
Calculation of Force Acting on the Armature of Electromagnetic Actuator

Slouka, David , Kůs, Václav
Problematika homogenní aplikace laserového záření na rozsáhlé plochy lidské tkáně

Laser devices today are built using many different technical designs determined by their target application where a very special use have lasers in medicine. The effects of medical lasers are determined by their basic physical properties (wavelength, collimation, coherence, monochromaticity) and&...

Kůs, Václav
Necharakteristické harmonické a meziharmonické polovodičových měničů

Krasl, Milan , Vlk, Rostislav
HTS Transformer – Optimization of Winding Losses

This paper deals with a calculation of losses in winding of the superconducting transformer 1MVA. The idea of this usage was originated in the SKODA Research Ltd., Pilsen. 5kVA model of this transformer was made with co-operation AS CR, UWB Pilsen, MFF Prague, Skoda Research&#...

Collection's Items (Sorted by Submit Date in Descending order): 1 to 20 of 23