NDLI: The behavior of WLS state estimator near the maximum loadability point of power systems

Content Provider	IEEE Xplore Digital Library
Author	Tecchio, P.P.V. Benedito, R.A.S. Alberto, L.F.C.
Copyright Year	2010
Description	Author affiliation: Escola de Engenharia de São Carlos, Universidade de São Paulo, Brazil 13566-590 (Tecchio, P.P.V.; Benedito, R.A.S.; Alberto, L.F.C.)
Abstract	The Jacobian matrix of the power flow equations become singular at the maximum loadability point and problems of non convergence are observed due to ill-conditioning. The Jacobian of the state estimation formulation also becomes singular at the maximum loadability point and problems with state estimator convergence are expected. In this paper, the behavior of the WLS-state estimator in the neighborhood of the maximum loadability point is investigated. The results indicate that low levels of redundancy of the measurement set may lead to increased problems of convergence in the neighborhood of the maximum loadability point. But worst than that, average estimates of the total load that are lower than the real load are also observed. This behavior may lead operators to make non conservative estimates of load margin and allow the operation in non secure states.
Starting Page	1
Ending Page	6
File Size	478596
Page Count	6
File Format	PDF
ISBN	9781424465491
ISSN	19449925
e-ISBN	9781424465514
e-ISBN	9781424483570
DOI	10.1109/PES.2010.5589721
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2010-07-25
Publisher Place	USA
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	Convergence Measurement uncertainty Jacobian matrices Mathematical model Redundancy Bifurcation State estimation
Content Type	Text
Resource Type	Article

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