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Comparison of Optimum Reactive Power Schedule with Different Objectives Using LP Technique

Thukaram, Dhadbanjan and Yesuratnam, G (2006) Comparison of Optimum Reactive Power Schedule with Different Objectives Using LP Technique. In: International Journal of Emerging Electric Power Systems, 7 (3). pp. 1-29.

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Three algorithms for reactive power optimization are proposed in this paper with three different objective functions. The objectives in the proposed algorithm are to minimize the sum of the squares of the voltage deviations of the load buses, minimization of sum of squares of voltage stability L-indices of load buses (:3L2) algorithm, and also the objective of system real power loss (Ploss) minimization. The approach adopted is an iterative scheme with successive power flow analysis using decoupled technique and solution of the linear programming problem using upper bound optimization technique. Results obtained with all these objectives are compared. The analysis of these objective functions are presented to illustrate their advantages. It is observed comparing different objective functions it is possible to identify critical On Load Tap Changers (OLTCs) that should be made manual to avoid possible voltage instability due to their operation based on voltage improvement criteria under heavy load conditions. These algorithms have been tested under simulated conditions on few test systems. The results obtained on practical systems of 24-node equivalent EHV Indian power network, and for a 205 bus EHV system are presented for illustration purposes.

Item Type: Journal Article
Publication: International Journal of Emerging Electric Power Systems
Publisher: Walter de Gruyter GmbH & Co. KG
Additional Information: Copyright of this article belongs to Walter de Gruyter GmbH & Co. KG.
Keywords: reactive power schedule;voltage improvement;voltage stability;power losses
Department/Centre: Division of Electrical Sciences > Electrical Engineering
Date Deposited: 10 Apr 2012 09:59
Last Modified: 11 Apr 2012 07:22
URI: http://eprints.iisc.ac.in/id/eprint/44232

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