Suppression of self-excited oscillations in series-compensated transmission lines by excitation control of synchronous machines

The self-excited oscillations are likely to occur in highly series compensated transmission lines having low resistance, particularly in long-distance bulk-power EHV transmission lines. This paper proposes a measure to suppress the self-excited oscillations in which the excitation of a synchronous machine is controlled by a reactive power (Q) signal. This paper also discusses the theoretical analyses of this suppression and the results of testing using a small generator.