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    Wyświetlanie 1-5 z 5
    Tytuł:
    Load flow and contingency analysis for transmission line outage
    Autorzy:
    Aeggegn, Dessalegn Bitew
    Salau, Ayodeji Olalekan
    Gebru, Yalew
    Powiązania:
    https://bibliotekanauki.pl/articles/140622.pdf
    Data publikacji:
    2020
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    contingency analysis
    DIgSILENT software
    line outage
    Newton Raphson method
    Opis:
    In recent years, power systems have been pushed to operate above their limits due to the increase in the demand for energy supply and its usage. This increase is accompanied by various kinds of obstructions in power transmission systems. A power system is said to be secured when it is free from danger or risk. Power systems security deals with the ability of the system to withstand any contingencies without any consequences. Contingencies are potentially harmful disturbances which occur during the steady state operation of a power system. Load flow constitutes the most important study in a power system for planning, operation, and expansion. Contingency selection is performed by calculating two kinds of performance indices; an active performance index (PIP) and reactive power performance index (PIV) for a single transmission line outage. In this paper, with the help of the Newton Raphson method, the PIP and PIV were calculated with DIgSILENT Power Factory simulation software and contingency ranking was performed. Based on the load flow results and performance indexes, the Ethiopian Electric Power (EEP) North-West region network is recommended for an upgrade or the reactive power or series compensators should be constructed on the riskiest lines and substations.
    Źródło:
    Archives of Electrical Engineering; 2020, 69, 3; 581-594
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Boullee, Wolter, Newton. Architektura i newtonianizm w dobie oświecenia
    Boullee, Voltaire, Newton. Architecture and newtonianism in the age of Enlightment
    Autorzy:
    Świtek, Gabriela
    Powiązania:
    https://bibliotekanauki.pl/articles/706994.pdf
    Data publikacji:
    2014
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    Boullee
    Voltaire
    Newton
    theory of architecture
    Enlightment
    Wolter
    teoria architektury
    oświecenie
    Opis:
    This article presents selected aspects of the cult of Isaac Newton in France during the Age of the Enlightenment that appear both in Voltaire’s philosophical writings as well as in contemporary visual culture. These reflections feed into art historical interest in the affinity of “two cultures” (C.P. Snow), that is science and humanities, at the same raising questions on methods of research in the reception of scientific theories in art. The paper recalls earlier research on the phenomenon of Newtonianism in eighteenth century European culture (F. Wagner, J.B. Shank), as well as discussions on Newtonian iconography in literature and the visual arts (M.H. Nicholson, M. Keynes, F. Haskell, J. Gage, A.M. Vogt). The celebrated project by Étienne-Louis Boullée for Newton’s cenotaph serves as the main architectural example of Newtonianism in the Age of Enlightenment, but also contributes to analysis on the reception of scientific discoveries in visual arts. The description of Newton’s cenotaph, included in Architecture; Essai sur l’art by Boullée, is compared with selected excerpts from Letters on the English and Elements of Newton’s Philosophy by Voltaire, these being the main source of the popularization of his scientific discoveries in France. The design for Newton’s monument is interpreted in the context of a wider phenomenon, namely the cult of the genius and the cult of posterity in the Enlightenment era. Two aspects of Boullée’s project – the spherical shape and the symbolism of light – are subject to a more detailed analysis, since the decomposition of light and the law of gravity that encompasses the infinite space of the universe are the two main themes recurring in Newton’s iconography, in literature, painting and sculpture. The spherical shape of the cenotaph (as noted earlier by the architect’s monographer A.M. Vogt) is not an “illustration” of Newton’s discovery; the law of gravity assumes that the Earth is not a sphere, but a spheroid. The spherical form of the monument can, at most, be considered as an example of the quest for new formulations of iconography, referring to the attributes of the astronomer and Astronomy (Urania); as one example of the so-called fabriques astronomiques; as a reinterpretation of the shape of the Pantheon; or a reference to then contemporary hot air ballooning. The contrast of light and shadow, mentioned by Boullée in his description of the cenotaph, has little in common with the representation of the famous Newtonian experiment of the dispersive prism. Rather, it forms part of a new and persuasive symbolism of light and darkness, typical of the French Enlightenment, present for example in the depictions of the Apotheosis of Voltaire, as well as in the aesthetics of the sublime outlined by Edmund Burke. The importance of light in Newton’s cenotaph is interpreted in conjunction with the iconography of a small garden building in Ermenonville (Temple de la Philosophie Moderne), in which one column bearing the inscription “Newton – Lucem” was dedicated to the scientist. This context brings us to an earlier analysis of this rotunda (V. Klein), which emphasized that Newton’s achievements – known in France in the second half of the eighteenth century – included not just the decomposition of white light using a prism, but also an early hypothesis defining light as a kind of ether.
    Źródło:
    Rocznik Historii Sztuki; 2014, 39; 73-96
    0080-3472
    Pojawia się w:
    Rocznik Historii Sztuki
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    CHB inverter with DC-link capacitor balancing and total harmonic minimization
    Autorzy:
    Armi, F.
    Manai, L.
    Besbes, M.
    Powiązania:
    https://bibliotekanauki.pl/articles/141332.pdf
    Data publikacji:
    2018
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    CHB inverter
    capacitor voltage balancing
    switching angles
    Newton Raphson
    algorithm
    SHE
    THD
    Opis:
    A cascaded H-bridge (CHB) multilevel inverter generally requires several DC sources. An alternative option is to replace the separate DC source feeding an H-bridge cell with a capacitor, while maintaining the other H-bridge cell with a real DC voltage source. In this paper a 7-level cascaded H-bridge inverter with a single DC-source is presented. This paper focuses mainly to achieve effective capacitor voltage balancing and selective harmonic elimination (SHE) based on the Newton Raphson algorithm (N–R). It shows hope to reduce the voltage ripple of the capacitors, which leads to higher power conversion efficiency with equal power distribution, reduces the initial cost, and complexity hence it is apt for industrial applications. Simulation results support the proposed control technique.
    Źródło:
    Archives of Electrical Engineering; 2018, 67, 1; 81-93
    1427-4221
    2300-2506
    Pojawia się w:
    Archives of Electrical Engineering
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    A Rapid Monitoring Method for Natural Gas Safety Monitoring
    Autorzy:
    Li, Rongli
    Fan, Yuexin
    Powiązania:
    https://bibliotekanauki.pl/articles/1844534.pdf
    Data publikacji:
    2021
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    trend judgment
    CUSUM
    Dempster-Shafer evidence theory
    Gauss-Newton nonlinear fitting
    fast alarm monitoring
    concentration prediction
    Opis:
    The quick leakage alarm and the accurate concentration prediction are two important aspects of natural gas safety monitoring. In this paper, a rapid monitoring method of sensor data sharing, rapid leakage alarm and simultaneous output of concentrations prediction is proposed to accelerate the alarm speed and predict the possible impact of leakage. In this method, the Dempster-Shafer evidence theory is used to fuse the trend judgment and the CUSUM (cumulative sum) and the Gauss-Newton iteration is used to predict the concentration. The experiment system based on the TGS2611 natural gas sensor was built. The results show that the fusion method is significantly better than the single monitoring method. The alarm time of fusion method was more advanced than that of the CUSUM method and the trend method (being averagely, 10.4% and 7.6% in advance in the CUSUM method and the trend method respectively). The relative deviations of the predicted concentration were the maximum (13.3%) at 2000 ppm (parts per million) and the minimum (0.8%) at 6000 ppm, respectively.
    Źródło:
    International Journal of Electronics and Telecommunications; 2021, 67, 3; 325-330
    2300-1933
    Pojawia się w:
    International Journal of Electronics and Telecommunications
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
    Tytuł:
    Conversion between Cartesian and geodetic coordinates on a rotational ellipsoid by solving a system of nonlinear equations
    Transformacja współrzędnych kartezjańskich na geodezyjne na elipsoidzie obrotowej poprzez rozwiązanie układu równań nieliniowych
    Autorzy:
    Ligas, M.
    Banasik, P.
    Powiązania:
    https://bibliotekanauki.pl/articles/145430.pdf
    Data publikacji:
    2011
    Wydawca:
    Polska Akademia Nauk. Czytelnia Czasopism PAN
    Tematy:
    szerokość geodezyjna
    wysokość geodezyjna
    metoda Fukushimy
    metoda Bowringa
    Cartesian and geodetic coordinates
    rotational ellipsoid
    Newton's method
    coordinate transformation
    Opis:
    A new method to transform from Cartesian to geodetic coordinates is presented. It is based on the solution of a system of nonlinear equations with respect to the coordinates of the point projected onto the ellipsoid along the normal. Newton's method and a modification of Newton's method were applied to give third-order convergence. The method developed was compared to some well known iterative techniques. All methods were tested on three ellipsoidal height ranges: namely, (-10 - 10 km) (terrestrial), (20 - 1000 km), and (1000 - 36000 km) (satellite). One iteration of the presented method, implemented with the third-order convergence modified Newton's method, is necessary to obtain a satisfactory level of accuracy for the geodetic latitude […] and height […] km, i.e. less than a millimetre) for all the heights tested. The method is slightly slower than the method of Fukushima (2006) and Fukushima's (1999) fast implementation of Bowring's (1976) method.
    Artykuł przedstawia nowa metodę transformacji miedzy współrzędnymi kartezjanskimi a współrzędnymi geodezyjnymi na elipsoidzie obrotowej. Metoda polega na rozwiązaniu nieliniowego układu równań, w którym niewiadomymi są współrzędne punktu leżącego na powierzchni elipsoidy a będącego rzutem punktu znajdującego się poza elipsoida wzdłuż normalnej. Tak wyznaczone współrzędne punktu na elipsoidzie są podstawa do obliczenia szerokości i wysokości geodezyjnej. Do rozwiązania układu równań zastosowano metodę Newtona oraz zmodyfikowaną metodę Newtona charakteryzującą się zbieżnością trzeciego rzędu. Nowa metoda została porównana z kilkoma dobrze znanymi rozwiązaniami iteracyjnymi. Wszystkie metody były testowane na trzech zakresach wysokości elipsoidalnych: -10 - 10 km (ziemski), 20 - 1000 km, 1000 - 36000 km (satelitarny). Zastosowanie zmodyfikowanej metody Newtona powoduje, iż jedna iteracja nowej metody wystarczy aby osiągnąć zadowalający poziom dokładności zarówno dla szerokości geodezyjnej, jak i wysokości. Prezentowana metoda jest nieco wolniejsza niż metoda Fukushimy (2006) oraz od szybkiej implementacji metody Bowringa (Fukushima, 1999).
    Źródło:
    Geodesy and Cartography; 2011, 60, 2; 145-159
    2080-6736
    2300-2581
    Pojawia się w:
    Geodesy and Cartography
    Dostawca treści:
    Biblioteka Nauki
    Artykuł
      Wyświetlanie 1-5 z 5

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