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The Application of Dynamic Programming in a Discrete Supplementary Control for Transient Stability Enhancement of Multimachine Power Systems

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2 Author(s)
Lubkeman, D.L. ; Department of Electrical and Computer Engin North Carolina State University ; Heydt, G.T.

This paper considers the use of a discrete supplementary control for transient stability enhancement of multimachine power systems. The principal advantage of the method presented in this paper is that off-line computations are used. This permits the application of the supplementary control of a "multimachine" power system. The designation "multimachine" is used in this conext to denote systems of up to three machines; for practical systems containing more than three machines, appropriate model order reduction is suggested. Supplementary controls differ from primary controls in that they are only used during disturbances rather than continuously. Attention is focused on the insertion of braking resistors and a specially designed dynamic programming algorithm is described for optimal resistor switching. The switching strategy is computed off-line so that the on-line computational requirements are minimal. The contribution of this paper is in the area of multimachine control and, in particular, a power system emergency state control. Topics concerning control models, optimization criteria and characteristics of discrete supplementary controls have been addressed. Control strategies are evaluated through digital and analog simulation involving a ten machine test system.

Published in:

Power Apparatus and Systems, IEEE Transactions on  (Volume:PAS-104 ,  Issue: 9 )

Date of Publication:

Sept. 1985

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