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    Wyświetlanie 1-4 z 4
    Tytuł:
    Three-phase hybrid transformer using matrix-chopper as an interface between two AC voltage sources
    Autorzy:
    Kaniewski, J.
    Fedyczak, Z.
    Szcześniak, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/950668.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    hybrid transformer
    power system
    matrix chopper
    Opis:
    This paper deals with a three-phase power system with hybrid transformer (HT) installed between two AC sources. The main aim of this paper is analyze the basic properties of HT with active load and ability to bidirectional energy flow. The HT contains two main units – a conventional transformer with electromagnetic coupling and PWM AC line chopper connected with secondary windings with electric coupling. The HT is located between the distribution system and a Local Balancing Area (LBA) with low power local energy sources. After describing the HT circuit and three-phase, twosources power system, the mathematical and circuit models of the AC source with HT are presented. These models are verified by means of the simulation and experimental test results obtained for a three-phase HT of about 3 kVA rated power.
    Źródło:
    Archives of Electrical Engineering; 2014, 63, 2; 197-210
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Power flow controller based on bipolar direct PWM AC/AC converter operation with active load
    Autorzy:
    Kaniewski, Jacek Zbigniew
    Powiązania:
    https://bibliotekanauki.pl/articles/141487.pdf
    Data publikacji:
    2019
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    power flow controller
    direct AC/AC converter
    matrix chopper
    power quality
    Opis:
    The uncontrolled power flow in the AC power system caused by renewable energy sources (restless sources, distributed energy sources), dynamic loads, etc., is one of many causes of voltage perturbation, along with others, such as switching effects, faults, and adverse weather conditions. This paper presents a three-phase voltage and power flow controller, based on direct PWM AC/AC converters. The proposed solution is intended to protect sensitive loads against voltage fluctuation and problems with power flow control in an AC power system. In comparison to other solutions, such as DVR, UPFC, the presented solution is based on bipolar matrix choppers and operates without a DC energy storage unit or DC link. The proposed solution is able to compensate 50% voltage sags, in the case of three-phase symmetrical voltage perturbation, and single phase voltage interruptions. Additionally, by means of a voltage phase control with a range of 60◦ in each phase, it is possible to control the power flow in an AC power system. The paper presents an operational description, a theoretical analysis based on the averaged state space method and four terminal descriptions, and the experimental test results from a 1 kVA laboratory model operating under active load.
    Źródło:
    Archives of Electrical Engineering; 2019, 68, 2; 341-356
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Design and Noise Analysis of a Novel Auto-Zeroing Structure for Continuous-Time Instrumentation Amplifiers
    Autorzy:
    Maréchal, S.
    Nys, O.
    Krummenacher, F.
    Chevroulet, M.
    Kayal, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/226106.pdf
    Data publikacji:
    2013
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    front-end
    instrumentation amplifier
    low-noise
    low power
    chopper
    auto-zero
    Opis:
    This paper introduces a low-noise, low-power amplifier for high-impedance sensors. An innovative circuit using an auto-zeroed architecture combined with frequency modulation to reject offset and low-frequency noise is proposed and analysed. Special care was given to avoid broadband noise aliasing and chopping in the signal path, and to minimize both the resulting equivalent input offset voltage and equivalent input biasing current. The theoretical noise analysis of the proposed topology covers most of the noise sources of the circuit. Simulations show that the input-referred noise level of the circuit is 13.4nV/√Hz for a power consumption of 85µA with a power supply from 1.8V to 3.6V.
    Źródło:
    International Journal of Electronics and Telecommunications; 2013, 59, 4; 397-404
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Real-time implementation of an interconnected observer design for p-cells chopper
    Autorzy:
    Laidi, K.
    Benmansour, K.
    Ferdjouni, A.
    Bouchhida, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/141378.pdf
    Data publikacji:
    2010
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    obserwator
    switching modes
    zasilanie
    p-cell chopper
    observer design
    interconnected observer
    Opis:
    This paper deals with an observer design for a p-cell chopper. The goal is to reduce drastically the number of sensors in such system by using an observer in order to estimate all the capacitor voltages. Furthermore, considering an instantaneous model of a p-cell chopper, an interconnected observer is designed in order to estimate the capacitor voltages. This is realized by using only the load current measurement. Simulation results are given in order to illustrate the performance of such observer. To demonstrate the validity of our approach, experimental results based on Digital Signal Processor (DSP) are presented.
    Źródło:
    Archives of Electrical Engineering; 2010, 59, 1-2; 5-20
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-4 z 4

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