NDLI: An adaptive sampling technique to correct large passivity violations

Content Provider	IEEE Xplore Digital Library
Author	Porkar, B. Vakilian, M. Shahrtash, S.M.
Copyright Year	2008
Description	Author affiliation: Dept. of Electr. Eng., Sharif Univ. of Technol., Tehran (Porkar, B.; Vakilian, M.) \|\| Dept. of Electr. Eng., Iran Univ. Sci. of Technol., Tehran (Shahrtash, S.M.)
Abstract	Rational functions for approximation of the admittance matrix elements of a linear power system/component are used to increase the computational efficiency for the analysis of electromagnetic transients. The challenge in this regard is passivity enforcement of the resultant model to guarantee numerical stability of the analyses. The main cause of passivity violation of the equivalent model of a passive system/ component, in a specific frequency region, is the selection of unsuitable and/or insufficient number of frequency samples for fitting. The more severe the passivity violations are, the more effort is required to enforce passivity. This paper presents an adaptive sampling technique for passivity enforcement as a post-processing tool. This approach can effectively correct large passivity violations. Based on this method a non passive region is identified via a pure algebraic method exploiting the existence of pure imaginary eigenvalues in the Hamiltonian matrix of the system state space equations. A bisection method is employed to determine the adaptive frequency samples which are added to the existing samples in a refitting process. The proposed method is applied to correct passivity violation of the admittance model of a two winding transformer.
Starting Page	1
Ending Page	8
File Size	554267
Page Count	8
File Format	PDF
ISBN	9780733427152
Language	English
Publisher	Institute of Electrical and Electronics Engineers, Inc. (IEEE)
Publisher Date	2008-12-14
Publisher Place	Australia
Access Restriction	Subscribed
Rights Holder	Univ of New South Wales
Subject Keyword	Power system transients Power system stability Electromagnetic analysis Power system modeling Power system analysis computing Sampling methods Frequency Bisection method Hamiltonian matrix Computational efficiency Admittance Transient analysis Adaptive sampling technique large passivity violations
Content Type	Text
Resource Type	Article

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