A new and fast technique for voltage stability analysis of a grid network using system voltage space

Raghunathan, R and Ramanujam, R and Parthasarathy, K and Thukaram, D (1998) A new and fast technique for voltage stability analysis of a grid network using system voltage space. In: International Journal of Electrical Power & Energy Systems, 20 (5). pp. 337-344.

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Abstract

The relative positions of the bus voltage phasors in the voltage space of a system depend on the characteristics of and the power flow in, the transmission network. When the voltage space of the system is examined with respect to the "centroid" of the system voltage space, it is possible to identify the loadability of buses and rank them accordingly. (The term centroid is used owing to the lack of a better word.) A technique based an concepts applied to equilibrium analysis of rigid bodies is developed to determine the centroid voltage of the system voltage space and centroid voltage of the generator voltage space. The relative positions of the bus voltage phasors with respect to the centroid voltage of the system voltage space and centroid voltage of the generator voltage space are used to identify and compute a voltage stability index for the load buses in the system. This technique is compared with three other techniques proposed in the literature. The relative merits of all the techniques are discussed and sample results are provided. The results indicate that the proposed technique is simple, reliable and fast, requiring only the examination of the system voltage space with respect to the centroid voltages. The proposed technique is ideally suited for on-line EMS applications in an Energy Control Centre as it requires only the output of the state estimator.

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:	Voltage stability;security assessment;EMS application.
Department/Centre:	Division of Electrical Sciences > Electrical Engineering
Date Deposited:	13 Nov 2009 06:00
Last Modified:	19 Sep 2010 04:59
URI:	http://eprints.iisc.ac.in/id/eprint/17979

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