• proposal of an alternative transmission line model for symmetrical and asymmetrical configurations

    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1393/01/01
    • تاریخ انتشار در تی پی بین: 1393/01/01
    • تعداد بازدید: 451
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     this article shows a transmission line model for simulation of fast and slow transients, applied to symmetrical or asymmetrical configurations. a transmission line model is developed based on lumped elements representation and state-space techniques. the proposed methodology represents a practical procedure to model three-phase transmission lines directly in time domain, without the explicit or implicit use of inverse transforms. in three-phase representation, analysis modal techniques are applied to decouple the phases in their respective propagation modes, using a correction procedure to set a real and constant matrix for untransposed lines with or without vertical symmetry plane. the proposed methodology takes into account the frequency-dependent parameters of the line and in order to include this effect in the state matrices, a fitting procedure is applied. to verify the accuracy of the proposed state-space model in frequency domain, a simple methodology is described based on line distributed parameters and transfer function associated with input/output signals of the lumped parameters representation. in addition, this article proposes the use of a fast and robust integration procedure to solve the state equations, enabling transient and steady-state simulations. the results obtained by the proposed methodology are compared with several established transmission line models in emtp, taking into account an asymmetrical three-phase transmission line. the principal contribution of the proposed methodology is to handle a steady fundamental signal mixed with fast and slow transients, including impulsive and oscillatory behavior, by a practical procedure applied directly in time domain for symmetrical or asymmetrical representations.

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