Oscillation

A repetitive motion that can be either undamped, positively damped, or negatively damped.

Oscillation

An oscillation is just a repetitive motion that can be either undamped, positively damped (decaying with time), or negatively damped (growing with time).

Types of oscillations include:

• Transients: Usually high frequency and highly damped
• Local plant: Usually from 1 to 5 Hz
• Inter-area oscillations: From 0.15 to 1 Hz
• Slower dynamics: Such as AGC, less than 0.15 Hz
• Subsynchronous resonance: 10 to 50 Hz (less than synchronous)