QuarterlyIssue 2 (218)
Scientific Committee
CONTENTS
Foreword
- Adrian NOCOŃ, Stefan PASZEK: Sensitivity analysis of power system stability factors including the uncertainty of mathematical model parameters
- Ryszard PORADA, Norbert MIELCZAREK: Comparative researches modelling methods of chaotic states in power electronics systems
- Barbara KULESZ, Marian PASKO, Andrzej SIKORA: DC traction multi-pulse voltage transformation systems using magnetically coupled chokes in case of distorted voltage supply
- Andrzej CIOSKA, Zbigniew PILCH: Mathematical model and simulation results for movement 2-elements flat manipulator
- Lesław TOPÓR-KAMIŃSKI; Aleksander KUMOR: Third-order one-port quadrature oscillator with current conveyors CCII
- Marcin KASPRZAK: The possibility of realization of 13.56 MHz/500 W class DE inverter at optimum commutation mode
- Arkadiusz GANCARCZYK: Review methods of measuring the parameters of electrical stun gun
- Piotr HOLAJN: Eight-input operational amplifier of hybrid integrated circuit in analog systems
- Michał PNIEWSKI: Methods evaluations of usefulness internet connection for voice transmission (VOIP)
- Wojciech MITKOWSKI, Anna OBRĄCZKA: Electrical Chua's chain network
Adrian NOCOŃ, Stefan PASZEK
Instytut Elektrotechniki i Informatyki, Politechnika Śląska w Gliwicach
SENSITIVITY ANALYSIS OF POWER SYSTEM STABILITY FACTORS INCLUDING THE UNCERTAINTY OF MATHEMATICAL MODEL PARAMETERS
Summary. The paper presents sensitivity analysis of the stability factors that can be used as criteria for further optimisation of power system stabilizers. The sensitivity of these factors to changes of selected mathematical model parameters of the sources connected to the medium voltage distribution network analysed was investigated. The obtained results were used for determining parameters of the models being more and less significant for the sensitivity analysis. The models taking into account nonlinearity were applied to modelling the system.
Ryszard PORADA, Norbert MIELCZAREK
Instytut Elektrotechniki i Elektroniki Przemysłowej, Politechnika Poznańska
COMPARATIVE RESEARCHES MODELLING METHODS OF CHAOTIC STATES IN POWER ELECTRONICS SYSTEMS
Summary. In the paper are generally characterized problems and methods of numerical and analytic modelling in power electronics systems. We curried out analytic and numerical investigations on example of 1-phase transistor inverter, controlled with PWM method modulation. Some chosen of comparative investigations appointed analytic and numerical solutions are presented. Researches were performed in simulatory program ChaoPhs, written in environment C++ Builder basing on technology of object-oriented programming.
Barbara KULESZ, Marian PASKO, Andrzej SIKORA
Instytut Elektrotechniki i Informatyki, Politechnika Śląska w Gliwicach
DC TRACTION MULTI-PULSE VOLTAGE TRANSFORMATION SYSTEMS USING MAGNETICALLY COUPLED CHOKES IN CASE OF DISTORTED VOLTAGE SUPPLY
Summary. Tram traction in Poland uses dc voltage obtained by transforming and rectifying ac power grid voltage with the help of multi-phase transformers and uncontrolled diode bridges. This voltage always contains higher harmonics. These harmonics are „transferred” to the supply current as well. Using multi-phase transformation circuits, consisting of two 6-phase transformers instead of one three-phase transformer should produce less harmonics in dc voltage and supply current. However, in case of distorted supply voltage this cannot be true. The paper deals with the problem, how introduction of cathode chokes into load circuit influences higher harmonics of dc voltage and ac supply current. Several supply voltage waveforms were analysed, with THD not higher than standardised 8%, but with different phase angles of 5th and 7th harmonics. 6-pulse system was used as a reference, and 24-pulse systems were investigated with rectifiers connected either in parallel or in mixed fashion (series-parallel).
Andrzej CIOSKA, Zbigniew PILCH
Katedra Mechatroniki, Politechnika Śląska w Gliwicach
MATHEMATICAL MODEL AND SIMULATION RESULTS FOR MOVEMENT 2-ELEMENTS FLAT MANIPULATOR
Summary. In the article the 2-elements model of the manipulator was described. For geometrical and mass parameters of the model the move dynamic equations were derived (taking into account mass decomposition and mechanical losses). The mutual influences were taken into consideration at those equations. To the description of the manipulator move the Denavit-Hartenberg notation was applied. For determination of linear and angular velocity at the 2-elements arrangement were used appointed Jacobians. The dynamic equations of the move were implemented into Matlab-Simulink. In software Inventor 2010 was built alternative model. In the last part of article authors presented the results of investigation. The results of simulation from Matlab-Simulink and Inventor were compared.
Lesław TOPÓR-KAMIŃSKI; Aleksander KUMOR
Instytut Metrologii, Elektroniki i Automatyki, Politechnika Śląska w Gliwicach
THIRD-ORDER ONE-PORT QUADRATURE OSCILLATOR WITH CURRENT CONVEYORS CCII
Summary. Synthesis of parallel resonance circuit GLC with negative conductance –g as a second order one-port oscillator is presented. This method is used for synthesis of third order oscillator with GLC elements and frequency dependent negative conductance D. On the basis of characteristic equation the condition of oscillations and the oscillation frequency are obtained. More over theoretical and practical realization of third order one-port oscillator with tunable impedance inverter and converter is presented. For practical realization of current conveyors are used current feedback amplifiers build on AD844. PSPICE simulation results for various conditions of oscillation in ideal oscillator with conveyors and non-ideal oscillator, with type CFA amplifiers build on AD844 are included.
Marcin KASPRZAK
Katedra Energoelektroniki, Napędu Elektrycznego i Robotyki, Politechnika Śląska w Gliwicach
THE POSSIBILITY OF REALIZATION OF 13.56 MHZ/500 W CLASS DE INVERTER AT OPTIMUM COMMUTATION MODE
Summary. The possibility of realization of 13.56 MHz/500 W inverter at optimum commutation mode is presented in the paper. The 300 V DC power supply, optimum commutation mode and utility of the latest RF Power Mosfet are assumed. The actual class DE inverter literature state is discussed. Characteristics of limited values of inverter parameters ensures optimal commutation mode are described. Types and parameters of latest RF Power Mosfet are presented in the table. Procedure of evaluation of drain to source capacitance and it results are presented too. The conclusion is, that realization of the inverter is possible only if drain to source capacitance is lover than 150 pF.
Arkadiusz GANCARCZYK
Instytut Metrologii, Elektroniki i Automatyki, Politechnika Śląska w Gliwicach
REVIEW METHODS OF MEASURING THE PARAMETERS OF ELECTRICAL STUN GUN
Summary. The study comprises technical parameters of the stun gun system and the methods of measuring them. These parameters are defined based on time and frequency characteristics of voltage and current waveforms generated by the stun gun. These waveforms are characterized by the presence of higher harmonics with very steep slopes of impulse and unsteadiness. The measuring impulse characteristic for the waveform of the output current of the stun gun is very sensitive to parasitic impedance (capacity), ambient conditions and can be characterized with very low degree of repetitiveness. The article also presents inconsistency of parameters’ interpretation and their volumes, which result from the applied measuring methods.
Piotr HOLAJN
Instytut Elektrotechniki i Informatyki, Politechnika Śląska w Gliwicach
EIGHT-INPUT OPERATIONAL AMPLIFIER OF HYBRID INTEGRATED CIRCUIT IN ANALOG SYSTEMS
Summary. The paper presents idea and practical of realizations eight-input operational amplifier of hybrid integrated circuit (HIC). There is proposed simple one pole macromodel of ideal circuit elements. There are described simple circuits based on eight-input operational amplifier with and/or without external elements. The results of measurements for analogues circuits basing on HIC-MIOA have been shown.
Michał PNIEWSKI
Instytut Metrologii i Automatyki Elektrotechnicznej, Politechnika Śląska w Gliwicach
METHODS EVALUATIONS OF USEFULNESS INTERNET CONNECTION FOR VOICE TRANSMISSION (VOIP)
Summary. The article presents an analysis of the practical examinations of the quality of voice calls using the packet network and there are examples of methods that can be used to evaluate the quality of the Internet connection. Some exemplary methods for evaluate voice quality, their classification and methods of measurement of parameters characterizing the quality of service. It reflects also the professional methods, such as measurement of MOS (Mean Opinion Score) with P.862 PESQ algorithm and (Perceptual Evaluation of Speech Quality) and the methods available for the home user. Presents the test environment to test voice quality. This allowed it to examine the impact of Internet connection parameters such as throughput, packet loss and delay.
Wojciech MITKOWSKI, Anna OBRĄCZKA
Katedra Automatyki, Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie
ELECTRICAL CHUA'S CHAIN NETWORK
Summary. In this paper the Chua's chain network in the state space Rn+1 was described. The equations of a system was presented and the basic analysis was carried out. Then numerical simulations for some parameters was executed. In this simulations the chaotic behavior was observed. To confirm chaotic dynamic, spectrum analysis and correlation analisys result was presented.