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Region of attraction in a power system with discrete LTCs

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2 Author(s)
Vournas, C.D. ; Nat. Tech. Univ. of Athens, Zografou, Greece ; Sakellaridis, N.G.

This paper extends some previously obtained results on load tap changer (LTC) stability and derives detailed conditions for the stability of a dynamical system consisting of discrete LTC transformers based on Lyapunov's direct method and its extension according to LaSalle's Invariance Principle. The exact region of attraction of a two LTC system is constructed based upon tap position and controlled voltage values. Generalizations and extensions are finally discussed in the framework of extracting rules for post-load-shedding stability.

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Circuits and Systems I: Regular Papers, IEEE Transactions on  (Volume:53 ,  Issue: 7 )