Electrical - Electronic Engineering / Elektrik - Elektronik Mühendisliği

Permanent URI for this collectionhttps://hdl.handle.net/11147/11

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  • Article
    Citation - Scopus: 21
    Robust Nonlinear Control Strategy To Maximize Energy Capture in a Variable Speed Wind Turbine With an Internal Induction Generator
    (Springer Verlag, 2012) İyasere, Erhun; Salah, Mohamed H.; Dawson, Darren M.; Wagner, John R.; Tatlıcıoğlu, Enver
    This paper proposes a control strategy to maximize the wind energy captured in a variable speed wind turbine, with an internal induction generator, at low to medium wind speeds. The proposed strategy controls the tip-speed ratio, via the rotor angular speed, to an optimum point at which the efficiency constant (or power coefficient) is maximum for a particular blade pitch angle and wind speed. This control method allows for aerodynamic rotor power maximization without exact wind turbine model knowledge. Representative numerical results demonstrate that the wind turbine can be controlled to achieve near maximum energy capture.
  • Article
    Citation - WoS: 3
    Citation - Scopus: 2
    Analysis of Excitations for a Groove Guide Resonator at 10 Ghz by Means of the Fdtd Method
    (Springer Verlag, 2005) Bechteler, Thomas F.
    Various excitations of a new groove guide resonator working in the X-band (8 GHz - 12 GHz) are investigated by means of numerical simulations. For the numerical simulations the Finite-Difference Time-Domain method is used. The groove guide resonator, modelled both with and without excitation structures, is discretised in space. The results in the time domain are then transformed into the frequency domain in order to obtain the resonance frequency spectrum. Comparison between simulations with and without excitations shows the effect of the excitations on the resonance frequency spectrum. The results are compared with those of previous analytical methods.