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: 14 Feb 2011 23:35
Last Modified: 28 Feb 2013 01:45

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