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Small-signal stability assessment of active distribution networks with dynamic loads

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3 Author(s)
Roy, N.K. ; Sch. of Eng. & Inf. Technol. (SEIT), Univ. of New South Wales, Canberra, ACT, Australia ; Pota, H.R. ; Orchi, T.F.

This paper investigates small-signal stability of a distribution system with distributed generator and induction motor load, as a dynamic element. The analysis is carried out over a distribution test system with different types of induction motor loads. The system is linearised by the perturbation method. Eigenvalues and participation factors are calculated to see the modal interaction of the system. The study indicates that load voltage dynamics significantly influence the damping of a newly identified voltage mode. This mode has frequency of oscillation between the electromechanical and subsynchronous oscillation of power systems. To justify the validity of the modal analysis time domain simulation is also carried out. Finally, significant parameters of the system that affect the damping and frequency of the oscillation are identified.

Published in:

Universities Power Engineering Conference (AUPEC), 2012 22nd Australasian

Date of Conference:

26-29 Sept. 2012