Small-signal stability, is the ability of the power system to maintain synchronism when subjected to small disturbances.
• A disturbance is considered to be small if the equations that describe the resulting response of the system may be linearized for the purpose of analysis.
• The small-signal stability problem is usually one of insufficient damping of system oscillations.
Analysis of practical power systems involves the simultaneoussolution of equations representing the following:
• Synchronous machines, and the associated excitation systems and prime movers.
• Interconnecting transmission network.
• Static and dynamic (motor) loads
• Other devices such as HVDC converters, static var compensators
For system stability studies it is appropriate to neglectthe transmission network and machine stator transients.• The dynamics of machine rotor circuits, excitation systems, prime mover and other devices are represented bydifferential equations.
• The result is that the complete system model consists of alarge number of ordinary differential and algebraic equations.
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