Dynamic security assessment of power systems using structure-preserving energy functions

Padiyar, KR and Ghosh, KK (1989) Dynamic security assessment of power systems using structure-preserving energy functions. In: International Journal of Electrical Power & Energy Systems, 11 (1). pp. 39-46.

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Abstract

An application of direct methods to dynamic security assessment of power systems using structure-preserving energy functions (SPEF) is presented. The transient energy margin (TEM) is used as an index for checking the stability of the system as well as ranking the contigencies based on their severity. The computation of the TEM requires the evaluation of the critical energy and the energy at fault clearing. Usually this is done by simulating the faulted trajectory, which is time-consuming. In this paper, a new algorithm which eliminates the faulted trajectory estimation is presented to calculate the TEM. The system equations and the SPEF are developed using the centre-of-inertia (COI) formulation and the loads are modelled as arbitrary functions of the respective bus voltages. The critical energy is evaluated using the potential energy boundary surface (PEBS) method. The method is illustrated by considering two realistic power system examples.

Item Type:	Journal Article
Publication:	International Journal of Electrical Power & Energy Systems
Publisher:	Elsevier science
Additional Information:	Copyright of this article belongs to Elsevier science.
Keywords:	Short-term system dynamics;security assessment;Lyapunov method.
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	13 Oct 2010 08:38
Last Modified:	13 Oct 2010 08:38
URI:	http://eprints.iisc.ac.in/id/eprint/33161

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