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    Wyświetlanie 1-6 z 6
    Tytuł:
    Faulted feeder identification and location for a single line-to-ground fault in ungrounded distribution system based on principal frequency component
    Autorzy:
    Liu, Ling
    Powiązania:
    https://bibliotekanauki.pl/articles/141574.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fault identification
    fault location
    single line-to-ground fault
    principal frequency component
    Opis:
    When a single line-to-ground fault occurs in the ungrounded distribution system, the steady-state fault current is relatively small for fault analysis and the transient fault current is observable, which can be used for faulted feeder identification and location. The principal frequency component retains most of the characteristics of the transient current. The principal frequency is related to the distance from the fault point to the substation and can be used for fault location. This paper analyzes the sequence network model of a single line-to-ground fault in the distribution network, and gives a method for principal frequency calculation. Depending on the characteristics of the maximum amplitude of the principal frequency component of the faulted feeder, the method of faulted feeder identification is given. Based on the complementary characteristics of the phase angle of the principal frequency component of the fault current and the phase angle at the substation bus, the faulted section location is carried out. MATLAB simulation is used to verify the effectiveness of the faulted feeder identification and location method.
    Źródło:
    Archives of Electrical Engineering; 2020, 69, 3; 695-704
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A robust predictive actuator fault-tolerant control scheme for Takagi-Sugeno fuzzy systems
    Autorzy:
    Witczak, P.
    Witczak, M.
    Korbicz, J.
    Aubrun, Ch.
    Powiązania:
    https://bibliotekanauki.pl/articles/199920.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    fault diagnosis
    fault identification
    robust control
    robust invariant set
    predictive control
    fault-tolerant control
    diagnostyka błędu
    identyfikacja błędów
    diagnostyka predykcyjna
    kontrola tolerancji błędu
    Opis:
    The paper deals with the problem of robust predictive fault-tolerant control for nonlinear discrete-time systems described by the Takagi-Sugeno models. The proposed approach is based on a triple stage procedure, i.e. it starts from fault estimation while the fault is compensated with a robust controller. The robust controller is designed without taking into account the input constraints related with the actuator saturation that may change due to its faulty behaviour. Thus, to check the compensation feasibility, the robust invariant set is developed, which takes into account the input constraints. If the current state does not belong to the robust invariant set, then suitable predictive control actions are performed in order to enhance the invariant set. This appealing phenomenon makes it possible to enlarge the domain of attraction, which makes the proposed approach an efficient solution for the fault-tolerant control. The final part of the paper shows an illustrative example regarding the application of the proposed approach to the twin-rotor system.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2015, 63, 4; 977-987
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    VSC-HVDC transmission line fault location based on transient characteristics
    Autorzy:
    Zhang, Yanxia
    Bi, Anlu
    Wang, Jian
    Zhang, Fuhe
    Lu, Jingyi
    Powiązania:
    https://bibliotekanauki.pl/articles/1841298.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    characteristic roots
    fault location
    identification of fault stages
    Prony algorithm
    VSC-HVDC
    Opis:
    Accurate and reliable fault location is necessary for ensuring the safe and reliable operation of the VSC-HVDC transmission system. This paper proposed a single-terminal fault location method based on the fault transient characteristics of the two-terminal VSCH-VDC transmission system. The pole-to-pole transient fault process was divided into three stages, the time-domain expression of the DC current during the diode freewheel stage was used to locate the fault point, and a criterion for judging whether the fault evolves to the diode freewheel stage was proposed. Taking into account the enhancing effect of the opposite system to the fault current, the DC side pole-to-ground fault networkwas equated to a fourth-order circuit model, the relationship of fault distance with the characteristic roots of fault current differential equationwas derived, and the Prony algorithmwas utilized for datafitting to extract characteristic roots to realize fault location. A two-terminal VSC-HVDC transmission system was modelled in PSCAD/EMTDC. The simulation result verifies that the proposed principle can accurately locate the fault point on the VSC-HVDC transmission lines.
    Źródło:
    Archives of Electrical Engineering; 2021, 70, 2; 381-398
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Identification of Circuit Parameters for the Specified or Measured Performances
    Autorzy:
    Rutkowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/226920.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    analog circuits
    parameter identification
    fault diagnosis
    Opis:
    Extension of the method of analog circuit parameter identification for the specified design performances, originally presented by the same author in 1982, is described. These parameters are designated by means of PSpice simulation of the adjoint circuit to the original one. In this adjoint circuit, elements of the original circuit, described by the sized parameters, are replaced by controlled sources. Each such source is controlled by the differential voltage or current, difference between the calculated voltage or current and the specified one, with infinitely large gain. The method is applicable to both linear and nonlinear DC circuits and AC circuits and can be used in many fields of analog circuit design, such as: finding of acceptability region, analog fault diagnosis, postproduction identification and tuning. In the later cases, design performances are replaced by measurements of Circuit Under Test (CUT). Simplicity, extremely low computational complexity and high accuracy are the main benefits of the proposed, basic Circuit Theory based, approach - the solution is found after a single PSpice simulation. For better understanding of the presented methodology, five practical examples are discussed.
    Źródło:
    International Journal of Electronics and Telecommunications; 2015, 61, 1; 95-100
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Evolutionary algorithms for global parametric fault diagnosis in analogue integrated circuits
    Autorzy:
    Jantos, P.
    Grzechca, D.
    Rutkowski, J.
    Powiązania:
    https://bibliotekanauki.pl/articles/201078.pdf
    Data publikacji:
    2012
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    analogue integrated circuits
    fault diagnosis
    localization
    identification
    evolutionary algorithms
    Opis:
    An evolutionary method for analogue integrated circuits diagnosis is presented in this paper. The method allows for global parametric faults localization at the prototype stage of life of an analogue integrated circuit. The presented method is based on the circuit under test response base and the advanced features classification. A classifier is built with the use of evolutionary algorithms, such as differential evolution and gene expression programming. As the proposed diagnosis method might be applied at the production phase there is a method for shortening the diagnosis time suggested. An evolutionary approach has been verified with the use of several exemplary circuits – an oscillator, a band-pass filter and two operational amplifiers. A comparison of the presented algorithm and two classical methods – the linear classifier and the nearest neighborhood method – proves that the heuristic approach allows for acquiring significantly better results.
    Źródło:
    Bulletin of the Polish Academy of Sciences. Technical Sciences; 2012, 60, 1; 133-142
    0239-7528
    Pojawia się w:
    Bulletin of the Polish Academy of Sciences. Technical Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    The efficiency of detecting the failures and troubleshooting while applying technical diagnostics for multi-computer systems
    Autorzy:
    Ye, K. Z.
    Kyaw, H. A.
    Portnov, E. M.
    Bain, A. M.
    Vasant, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/229469.pdf
    Data publikacji:
    2015
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    technical diagnostics
    fault
    identification
    ‘AND-OR’ graph
    efficiency
    control devices
    multi-machine power system
    troubleshooting
    majority principle
    Opis:
    This paper presents techniques which base on the concept of flows thinning together with the identification techniques. These methods are proposed to determine the expected number of failures to assess the efficiency of technical diagnostics of instruments. Additionally, this research focuses on the improvement of multi-machine troubleshooting systems, based on the ‘AND-OR’ graphs. Respective algorithms are presented. The majority principle uses the input information to check the correctness of the decision regarding identification of faulty machines. In this paper we base on the complete testing algorithm for elements of multi-computer complexes searching by criteria of failed element.
    Źródło:
    Archives of Control Sciences; 2015, 25, 1; 87-107
    1230-2384
    Pojawia się w:
    Archives of Control Sciences
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-6 z 6

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