Abstract
This article presents the analyzed results of two identical parallel-operated autonomous self-excited induction generators (SEIGs) supplying an induction motor (IM) load through a long-shunt compensation. The voltage equations of the parallel operated SEIGs can be simplified as a large equivalent SEIG using Kirchhoff's current law and the d-q axis induction-machine model is utilized to simulate the dynamic performance of the studied system. Both eigenvalue and eigenvalue sensitivity are used to examine the startup characteristics of the studied system under stationary reference frame while eigenvalue, root loci and phase-plane plots are also employed to examine the dynamic stability of the studied system under synchronously rotating reference frame. Both simulated and experimental results are compared and investigated to verify the effectiveness of the employed model. It can be concluded from the simulated and experimental results that the long-shunt connection between the parallel-operated SEIGs and the dynamic IM load has an unstable effect on the studied system when the shunt capacitor is improperly selected.
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