IEC 60034-16-1:1991,Rotating electrical machines Part 16: Excitation systems for synchronous machines Chapter 1: Definitions.
IEC 60034-16-1 defines terms applicable to the excitation systems of synchronous rotating electrical machines.
A static exciter which derives its power from both current and potential sources (dependent upon synchronous machine terminal quantities). The addition of inputs from both sources can be done on either the a.c. side or the d.c. side of the rectifiers and can be done In parallel or series. The rectifiers may be either controlled or non-controlled depending upon design.
Power system stabilizer
An equipment controlling the exciter output via the voltage regulator In such a way that power oscillations of the synchronous machine are damped. input variables may be speed, frequency, or power (or a combination of variables).