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Modal parameter estimation in the presence of non-linearities

Palmer, Edward (2009) Modal parameter estimation in the presence of non-linearities. In 19th Australasian Universities Power Engineering Conference : Sustainable Engergy Technologies and Systems, 27-30 September 2009, University of Adelaide, South Australia.

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    Abstract

    This paper investigates the use of time-frequency techniques to assist in the estimation of power system modes which are resolvable by a Digital Fourier Transform (DFT). The limitations of linear estimation techniques in the presence of large disturbances which excite system non-linearities, particularly the swing equation non-linearity are shown. Where a nonlinearity manifests itself as time varying modal frequencies the Wigner-Ville Distribution (WVD) is used to describe the variation in modal frequencies and construct a window over which standard linear estimation techniques can be used. The error obtained even in the presence of multiple resolvable modes is better than 2%.

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    ID Code: 40037
    Item Type: Conference Paper
    Keywords: Power System Stability, Modal Parameters, Non-lineaities, Time-frequency Analysis
    ISBN: 9780863967184
    Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600) > Power and Energy Systems Engineering (excl. Renewable Power) (090607)
    Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
    Past > Schools > School of Engineering Systems
    Copyright Owner: Copyright 2009 Please consult the authors.
    Deposited On: 15 Feb 2011 09:35
    Last Modified: 28 Feb 2013 11:45

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