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    Wyświetlanie 1-8 z 8
    Tytuł:
    A wide-band power electronics current source in reference current generator
    Autorzy:
    Gwóźdź, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/97463.pdf
    Data publikacji:
    2013
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    control algorithm
    DSP
    inverter
    PWM
    stability of an electrical system
    Opis:
    The paper considers wide-band voltage controlled power electronics current source. The current source has been designed as a part of 1-channel reference current generator designed for current meters testing. The control module of the generator utilizes a specialized Analog Devices Inc. DSPs based microcomputer module for power electronics applications. Used solutions have allowed obtain high quality referencing of the output current within reference signal. The paper presents the structure and selected aspects of the control algorithm of the current source. Also selected investigations results of the laboratory prototype of generator are presented.
    Źródło:
    Computer Applications in Electrical Engineering; 2013, 11; 252-257
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Static stability analysis of power systems
    Autorzy:
    Konoval, V.
    Prytula, R.
    Skrypnyk, O.
    Powiązania:
    https://bibliotekanauki.pl/articles/376128.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    static stability
    power system
    modal analysis
    Opis:
    The developed modal method for analyzing oscillating static stability of power systems is based on eigenvalues and eigenvectors. As a mathematical model to the study we use a system of linearized differential equations that describe the behaviour of synchronous machines and their excitation systems during minor disturbances. This approach allows us to analyse the static stability of large power systems, evaluate stability margins, degree of damping modes, and set adjustment mechanism for mode parameters to improve mode stability. We investigated the impact of generator excitation system replacement on stability of Ukraine’s power system. The suggested modal analysis is implemented in the DAKAR software suite [1].
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2015, 82; 11-19
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Power system participation factors for real and complex eigenvalues cases
    Autorzy:
    Konoval, V.
    Prytula, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/376120.pdf
    Data publikacji:
    2017
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    modal analysis
    participation factor
    static stability
    power system
    Opis:
    This paper provides a brief overview on existing approaches for defining participation factor in modal analysis. We calculated participation factors using different approximations and specific examples, and then compared the obtained results with equations derived from the mode evolution. As a result, the existing methods for determining a state variable participation factor in mode are proved incorrect result for complex eigenvalue case. Modem software applications designed to analyze power system stability deploy old approaches that provide incorrect results of modal analysis and pose risks to the operation of real power systems. To solve this problem we presented a new broadened definition of participation factor that assures correct results for real and complex eigenvalues cases. We used a two-mass mechanics system to validate proposed approach and our findings confirm the proposed participation factor theory.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2017, 90; 369-381
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Participation factor in modal analysis of power systems stability
    Autorzy:
    Konoval, V.
    Prytula, R.
    Powiązania:
    https://bibliotekanauki.pl/articles/376278.pdf
    Data publikacji:
    2016
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    modal analysis
    participation factor
    static stability
    power system
    Opis:
    This paper provides a brief overview on existing approaches for defining participation factor in modal analysis which characterizes the interaction between modes and state variables of power system. We calculated participation factors using different methods and compared the results obtained with the expressions derived from mode evolution. For cases of complex eigenvalues of linear differential equations characteristic matrix it was discovered incorrect existing approaches for defining participation factor of state variable in mode. Modern software applications designed to analyze power system stability widely deploy the approaches discussed that provide incorrect results of modal analysis and pose risks to the operation of real power systems. Therefore the problem of calculating the participation factor remains as important as ever.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2016, 86; 97-104
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Invariant properties of positive linear electrical circuits
    Autorzy:
    Kaczorek, Tadeusz
    Powiązania:
    https://bibliotekanauki.pl/articles/377307.pdf
    Data publikacji:
    2019
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    invariance
    positive
    linear
    system
    stability
    reachability
    transfer matrix
    Opis:
    The invariant properties of the stability, reachability, and transfer matrices of positive linear electrical circuits with integer and fractional orders are investigated. It is shown that the stability, reachability and transfer matrix of positive linear systems are invariant under their integer and fractional orders.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2019, 97; 109-123
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Positive and stable time-varying continous-time linear systems and electrical circuits
    Autorzy:
    Kaczorek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/377577.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    positive
    linear
    time-varying
    system
    electrical circuit
    stability
    test
    Opis:
    The positivity and stability of a class of time-varying continuous-time linear systems and electrical circuits are addressed. Sufficient conditions for the positivity and asymptotic stability of the system are established. It is shown that there exists a large class of positive and asymptotically stable electrical circuits with time-varying parameters. Examples of positive electrical circuits are presented.
    Źródło:
    Poznan University of Technology Academic Journals. Electrical Engineering; 2015, 81; 11-19
    1897-0737
    Pojawia się w:
    Poznan University of Technology Academic Journals. Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Determination of electromechanical eigenvalues based on analysis of different disturbance waveforms of a power system
    Autorzy:
    Pruski, P.
    Paszek, S.
    Powiązania:
    https://bibliotekanauki.pl/articles/97708.pdf
    Data publikacji:
    2014
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    power system
    eigenvalues associated with electromechanical phenomena
    transient states
    angular stability
    Opis:
    The paper presents the calculation results of the power system state matrix eigenvalues associated with electromechanical phenomena (i.e. electromechanical eigenvalues). There is compared the accuracy of eigenvalue calculations performed on the basis of the analysis of disturbance waveforms of instantaneous power, angular speed and power angle of generators of particular generating units of the power system. The method used for eigenvalue calculations consists in approximation of the disturbance waveforms of generating units with waveforms being a superposition of modal components whose parameters depend on the searched eigenvalues and their participation factors. A hybrid optimisation algorithm, being a serial combination of genetic and gradient algorithms, is used for minimisation of the objective function defined as a mean square error between the approximated and approximating waveforms. In order to increase the calculation accuracy, computations were repeated many times. The computation results were averaged.
    Źródło:
    Computer Applications in Electrical Engineering; 2014, 12; 130-143
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Analysis of positivity and stability of time-varying continuous-time linear systems and electrical circuits
    Autorzy:
    Kaczorek, T.
    Powiązania:
    https://bibliotekanauki.pl/articles/97265.pdf
    Data publikacji:
    2015
    Wydawca:
    Politechnika Poznańska. Wydawnictwo Politechniki Poznańskiej
    Tematy:
    positive
    linear
    time-varying
    system
    electrical circuit
    stability
    Lyapunov method
    test
    Opis:
    The positivity and stability of a class of time-varying continuous-time linear systems and electrical circuits are addressed. Sufficient conditions for the positivity and asymptotic stability of the system are established. It is shown that there exists a large class of positive and asymptotically stable electrical circuits with time-varying parameters. The Lyapunov method is extended to positive nonlinear systems. Examples of positive electrical circuits are presented.
    Źródło:
    Computer Applications in Electrical Engineering; 2015, 13; 1-18
    1508-4248
    Pojawia się w:
    Computer Applications in Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-8 z 8

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