NDLI: A Variable Step Size Decoupled State Estimator

Content Provider	IEEE Xplore Digital Library
Author	Rao, N.D. Tripathy, S.C.
Copyright Year	1963
Abstract	This paper describes an improved decoupled static-state estimator based on minimization of weighted least squares of the residuals (WLS). The basic idea of P-¿, Q-V decoupling of the fast decoupled load flow for node injections is extended to line flows. The solution is obtained alternately iterating the real and reactive power equations using constant submatrices of the 'information matrix'. Since no approximation is made in mismatch functions, the final solution is as accurate as the exact solution. This algorithm is compared with a 'constant gain algorithm' (CGA) using a full size gain matrix derived in terms of the Jacobian which is evaluated only at the first iteration. The 'decoupled state estimator' (DSE) requires considerably less storage and solution time but more iterations. However, by varying the step size during iterations, the convergence behavior of DSE approaches that of CGA. Thus the paper extends the research work reported in references [16, 17].
Starting Page	436
Ending Page	443
Page Count	8
File Size	1383006
File Format	PDF
ISSN	00189510
Volume Number	PAS-98
Issue Number	2
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	1979-03-01
Access Restriction	Subscribed
Rights Holder	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Subject Keyword	State estimation Load flow Jacobian matrices Power system reliability Real time systems Least squares approximation Equations Power system measurements Voltage Computer errors
Content Type	Text
Resource Type	Article
Subject	Engineering Energy Engineering and Power Technology Electrical and Electronic Engineering

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