What is an example of 'supplementary excitation control' equipment?

Supplementary excitation control refers to systems that enhance the stability and performance of synchronous generators during operation, particularly under dynamic conditions. The power system stabilizer serves this purpose by providing additional damping to the oscillations of the power system and improving overall system stability. It accomplishes this through feedback mechanisms that assess generator output and adjust excitation levels accordingly to counteract oscillatory behavior.

In contrast, while the voltage regulator is primarily focused on maintaining system voltage levels, and the load tap changer adjusts transformer voltages to maintain optimal voltage output, neither specifically addresses the dynamic stability enhancement that a power system stabilizer provides. The frequency inverter, on the other hand, is typically used to control the speed and torque of electric motors and does not relate directly to excitation control in generators. Therefore, the power system stabilizer is clearly aligned with the objectives of supplementary excitation control.