© The Institution of Electrical Engineers
An improved method is presented for the study of the dynamic stability of synchronous generating sets. The complete d- and q-axis machine equations with a.v.r. and governor control loops, linearised for perturbations about a steady-state operating condition, are solved to give the natural frequencies and degree of stability of the various oscillating modes for a single machine connected to an infinite busbar. A 30 MW alternator with multiloop a.v.r. an governor is used to illustrate the use of the method for the study of rotor oscillations and the dynamic-stability limits. The effects of some principal parameters, including those of the machine damper circuits, are examined and important limitations in the accuracy of previous methods of analysis are demonstrated.
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