Abstract
A study of the improvement in system dynamic stability through effective use of auxiliary control of a static VAR system (SVS) is presented. The efficacy of various controls signals for reactive power modulation of an SVS installed at the midpoint of a long transmission line is investigated with the objective of damping low-frequency oscillations which are critical in limiting power transfer. A new auxiliary signal designated as computed internal frequency (CIF) is proposed which synthesizes the frequency of the generator internal voltage from quantities available at the SVS bus. It is demonstrated that this signal is far superior to other conventional auxiliary signals in that it allows full utilization of the network transmission capacity.
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