Yazar "Herdem, S" seçeneğine göre listele

Listeleniyor 1 - 3 / 3
  • Küçük Resim Yok
    Öğe
    Computation of corona effects in transmission lines using state-space techniques
    (Pergamon-Elsevier Science Ltd, 2003) Herdem, S; Mamis, MS
    In this paper, state-space method is applied to compute transients in power transmission lines by considering corona effects. Transmission line is modeled by lumped parameter identical sections to simulate the distribution nature of the line and nonlinear corona branches are combined with these sections'. The whole system is composed of RLC elements, sources and switches. The response of the system is calculated using state-space method which has been developed for the analysis of nonlinear power electronic circuits with periodically operated switches. (C) 2002 Elsevier Science Ltd. All rights reserved.
  • Küçük Resim Yok
    Öğe
    Location of facts devices on power system for voltage control
    (UNIV WEST ENGLAND-UWE, 2005) Eminoglu, U; Alcinoz, T; Herdem, S
    The modelling of the load has a significant effect in the electrical power systems. This paper presents the effect of different static load models on the location of Static VAr Compensator (SVC). The static load types, in which active and reactive powers vary with voltage as an exponential form, are used. The effect of appropriate location of the SVC on voltage control for variable load conditions is investigated. For this purpose each load is varied as a stair-case and voltages are controlled at the desired levels by using minimum number of Static Var Compensator (SVC). Modelling and simulation of the system are performed using Matlab SimPowerSystems Blocksets. PI controllers are used to control SVC firing angles. The studied power system is a simple five-bus system.
  • Küçük Resim Yok
    Öğe
    Mathematical modeling of the magnetic filtration processes
    (IOS PRESS, 2003) Koksal, M; Abbasov, T; Herdem, S
    A mathematical model is proposed for the determination of non-stationary characteristics of the cleaning process of industrial liquids in magnetic filters. The theoretical investigation which provides the determination of the variation of the captured particles both with time and along the filter matrix is based on the general filtration equations. Considering the properties of the magnetic filtration process, non-stationary filtration equations involve the capturing and detachment coefficients of the particles in the filter matrix. The effect of the filter length on the magnetic filter performance is also presented. The obtained expressions make possible to compare the experimental and the expected theoretical results.