EFFECT OF MODE INERTIA ON THE ANALYSIS OF TORSIONAL DYNAMICS IN SERIES CAPACITOR COMPENSATED POWER-SYSTEMS

The accuracy of mode inertia, determined from manufacturer supplied tu rbogenerator mechanical data is not well established, but some studies suggest that in certain cases appreciable error may exist. This paper considers the effect of errors in mode inertia values on the predicti on of torsional oscillation damping in series capacitor compensated po wer systems. Both series resonance and parallel resonance are consider ed using two different test networks from the IEEE Benchmark Models fo r Subsynchronous Resonance. The results show that, for parallel resona nce, mode inertia error does not have a large affect on torsional damp ing predictions. However, for series resonance, mode inertia error can cause significant error in the prediction of damping for some modes, thus affecting conclusions about the maximum safe amount of series com pensation in a network. (C) 1997 Elsevier Science S.A.