A brief introduction to the phenomenon of sustained oscillation of a power system at subsynchronous frequencies is presented. Such oscillations result from the application of capacitors used for series compensation of transmission lines. A state-space model is employed to represent the action of subsynchronous armature currents on turbine- generator shaft torsional vibrations. A digital simulation program for the analysis of turbine generator shaft characteristics based on the state-space model is outlined. Two examples based on typical system parameters are given.
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Goldberg et al. (1979) studied this question.
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