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	Software Phase Lock Loops of PWM Rectifiers Šimek, Petr ; Škramlík, Jiří ; Valouch, Viktor In the paper the properties of three PLL techniques (known under names DSC-, DDSRF- a FVAVG-PLL) for different states of the feeding three-phase voltage system are assessed. As a crucial quality criterion of synchronization to the positive component of the fundamental harmonic voltage the errorbetween an estimated and real angle of the positive component of the fundamental harmonic voltage vector was selected. Two sampling periods Ts=0.05 ms and 0.5 ms as well as two gain values of a PL-type compensator were treated. Detailed record
	Questions of dimensioning grid filter for PWM rectifier Šimek, Petr ; Škramlík, Jiří ; Valouch, Viktor Properties and behavior of L and LCL grid filters for PWM rectifiers in terms of grid current harmonic spectra are analyzed in the paper. A procedure how to determine filter parameters is presented and comparison of the filters done by using programs developed. Detailed record
	Modelování a implementace trojfázového úsporného zapojení PWM měniče Šimek, Petr ; Škramlík, Jiří ; Valouch, Viktor ; Klíma, J. The mathematical model and description of the three-phase four-switch converter aimed at compensating reactive power is proposed. A mixed p-z approach based on integral transformations (the Laplace and Modified Z-transform) is used for obtaining solution in a closed-form. The analytical procedure is verified by experimental results. Detailed record
	Analytické modelování a implementace trojfázového B4 měniče s SVM modulací Paclt, Zdeněk ; Šimek, Petr ; Škramlík, Jiří ; Valouch, Viktor ; Klíma, J. The mathematical model and description of the three-phase four-switch converter aimed at compensating reactive power is proposed. A mixed p-z approach based on integral transformations (the Laplace and Modified Z-transform) is used for obtaining solution in a closed-form. The analytical procedure is verified by experimental results. Detailed record
	Řídicí strategie aktivního výkoného filtru Paclt, Zdeněk ; Šimek, Petr ; Škramlík, Jiří ; Valouch, Viktor The contribution deals with simulation of the control algorithm of a PWM rectifier that can be used as an active power filter too and how the control algorithm has been implemented into the dSpace 1103A based controller. The results of simulation and laboratory experiments are presented as well. Detailed record
	Zjednodušené 2D zobrazení elektromagnetického pole pohonu s indukčním motorem Nečesaný, Jakub ; Škramlík, Jiří ; Jehlička, Vladimír This work is focused on magnetic field modeling and analysis inside and outside the trolley bus 21 TR. Computation is carried out for application of two different power switching semiconductor devices. Influence on environment and near low-current and telecommunication systems is evaluated. Local maximum of magnetic field and the geometrical convergence is also determined. The results are discussed with the corresponding standards and concretemeasurement on the vehicle. Detailed record
	Numerical Analysis of the Magnetic Field of the Trolley Bus Nečesaný, Jakub ; Škramlík, Jiří This work is focused on magnetic field modeling and analysis inside and outside the trolley bus 21Tr. Computation is carried out for various working regimes for application of two different power switching semiconductor devices. Influence on environment and near low-current and telecommunication systems is evaluated. Computation of the magnetic field is per-formed by a professional FEM-based program QUICKFIELD. Problems associated with numerical computation are discussed. Local maximum of the magnetic field is also determined. Detailed record
	Modelování a analýza trojfázového čtyřprvkového PWM usměrňovače při nesouměrném napájecím napětí Klíma, J. ; Škramlík, Jiří ; Valouch, Viktor The matematical model and description of the three-phase four-switch converter aimed at compresating reactive power in the general case of unbalanced source voltages is proposed. A mixed p-z approach based on integral transformations (the Laplace and Modified Z-transform) is suggested for obtaining solution in a closed-form. The analytical procedure is verified by experimental results to confirm the effectiveness of the proposed control scheme. Detailed record
	The Impact of the Grid Impadance on the HPF Performance Škramlík, Jiří For the implementation of Hybrid Power Filters (HPF) into a real environment it is desirable to know the impact of the grid impedance on the HPF performance. The paper evaluates the impact of diffetent components of the grid impedance and a load impedance on the HPF performance criteria by using the Fourier analysis. Detailed record
	Overvoltage Phenomena and Electromagnetic Interference Produced by Voltage Source Inverter with IGCT Switching Devices Škramlík, Jiří ; Bartoš, Stanislav ; Jehlička, Vladimír The paper summarized experience optained from an IGCT - inverter operating under laboratory conditions as well as in city mass transport vehicles. Overvoltage phenomena arising between the inverter and the supplied induction motor, the influence of the used cables, and the EMC are discussed. Finally, a comparison of EMI produced by IGCT and IGBT converters is given. Detailed record

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2	Škramlík, Jan

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