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SM ISO690:2012 BERZAN, Vladimir, RIMSCHI, Valentin, PAŢIUC, Vladimir, TÎRŞU, Mihai. Puterea reactivă în liniile electrice . In: Problemele Energeticii Regionale, 2014, nr. 3(26), pp. 1-14. ISSN 1857-0070. |
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Problemele Energeticii Regionale | ||||||
Numărul 3(26) / 2014 / ISSN 1857-0070 | ||||||
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Pag. 1-14 | ||||||
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Rezumat | ||||||
This paper presents a numerical method for the calculation of electric circuits with
distributed parameters with losses that may vary over time. It is proposed to use the energy
integral in order to estimate the accuracy of numerical solutions. The elaborated numerical
scheme, named Albatross, is conservative with minimal dissipation and dispersion. These
properties lead to the fact that the computational error does not accumulate, that gives the
possibility to realize the transparent calculations of non stationary solutions without loss of
accuracy at large time intervals corresponding to 300…500 electromagnetic wave runs along
the line length right up to steady-state regime. The results of calculations for nonhomogeneous
circuits with distributed parameters are presented graphically. These results can
be used as a model to develop a new approximate methods for numerical solution of
electrotechnical problems. The solutions of this problems have been obtained by means of
operator method, complex amplitude method, Fourier method as well as by numerical method
Albatross. The results of calculations for various modes in the half-wave transmission line are
represented. The comparison between the physical and mathematical experiments in
analyzing of different regimes in half-wave electrical transmission line is represented. The
comparison of accuracy of the solutions obtained by proposed method, by Finite Difference
Time Domain (FDTD) method and by Godunov’s scheme for telegraph equations is carried
out. It is illustrated, that FDTD method has some limited application for solving the telegraph
equations in spite of the fact that it is of second order of accuracy. |
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Cuvinte-cheie Linie lungă de transmisie, ecuaţiile telegrafiştilor, curenţi şi tensiuni nestaţionare, parametri distribiuţi şi concentraţi |
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