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An expert system for power system voltage stability improvement

Thukaram, Bansilal D and Parthasarathy, K (1997) An expert system for power system voltage stability improvement. In: International Journal of Electrical Power & Energy Systems, 19 (6). pp. 385-392.

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Abstract

This paper presents a prototype of an expert system for monitoring and improving steady state voltage stability in power systems. The monitoring methodology is based on the L-index of load buses (Kessel and Glavitsch, IEEE Transactions, 1986, PWRD-1(3), 346–354). This index uses information on a normal load flow and is in the range from 0 (no load on the system) to 1 (voltage collapse). The control against voltage collapse is based on reducing the magnitude of the L-indices of the critical nodes for a given system operating condition based on heuristic criteria. The control variables considered are switchable VAR compensators, OLTC transformers and generators excitation. The proposed expert system technique has been tested under simulated conditions on a few practical Indian power systems. The performance of the expert system is compared with conventional optimization technique and concurrent results have been obtained. The proposed expert system technique is found to be suitable for on-line application in an Energy Control Center for voltage stability improvement as the solution is obtained fast, with a minimum of numerical computations. Results obtained for a 24 node EHV Indian power network and a modified IEEE 30 bus system are included for illustration purposes.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to Elsevier.
Keywords: voltage stability;L-index;expert system;Heuristic approach;Preventive control
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Date Deposited: 18 Apr 2007
Last Modified: 19 Sep 2010 04:37
URI: http://eprints.iisc.ernet.in/id/eprint/10698

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