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Detection and Estimation of Nonstationary Power Transients

Ledwich, Gerard, Palmer, Edward, & Ghosh, Arindam (2009) Detection and Estimation of Nonstationary Power Transients. In Messina, Arturo Roman (Ed.) Inter-area Oscillations in Power Systems : A Nonlinear and Nonstationary Perspective. Springer, United States, pp. 189-230.

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Abstract

This chapter looks at issues of non-stationarity in determining when a transient has occurred and when it is possible to fit a linear model to a non-linear response. The first issue is associated with the detection of loss of damping of power system modes. When some control device such as an SVC fails, the operator needs to know whether the damping of key power system oscillation modes has deteriorated significantly. This question is posed here as an alarm detection problem rather than an identification problem to get a fast detection of a change. The second issue concerns when a significant disturbance has occurred and the operator is seeking to characterize the system oscillation. The disturbance initially is large giving a nonlinear response; this then decays and can then be smaller than the noise level ofnormal customer load changes. The difficulty is one of determining when a linear response can be reliably identified between the non-linear phase and the large noise phase of thesignal. The solution proposed in this chapter uses “Time-Frequency” analysis tools to assistthe extraction of the linear model.

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ID Code: 31646
Item Type: Book Chapter
Keywords: Non-stationarity, Power Transients, Detection, Estimation, Linear Model, Non-linear Response
DOI: 10.1007/978-0-387-89530-7_7
ISBN: 978-0-387-89529-1
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600) > Power and Energy Systems Engineering (excl. Renewable Power) (090607)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > ELECTRICAL AND ELECTRONIC ENGINEERING (090600) > Renewable Power and Energy Systems Engineering (excl. Solar Cells) (090608)
Divisions: Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Engineering Systems
Deposited On: 12 Apr 2010 10:20
Last Modified: 01 Mar 2012 00:11

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