Power System Stability
Objects of lecture
Understand machines behavior during disturbance
Understand acceleration and deceleration of generating machines
Get familiar with the accelerating power
Understand acceleration and deceleration
Understand principles of equal area criteria
Get familiar with practical applications
References
Electric Power Systems, Hadi Saddat, 2006
Introduction:- Stability analyses is an important part of power system analyses , it is used in electric power system design and planning. Stability can be defined as the ability of the system to remain in synchronism following a disturbance, in other words we can say the ability of the system to remain in equilibrium following a disturbance. We have three types of stability analyses,
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Steady state analyses:- this deals with the ability of the system to remain in synchronism after a small and slow disturbance.
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Dynamic stability:- this kind of stability deals with small and slow disturbances lasting for a longer period of time.
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Transient stability:- this deals with sudden disturbances that occur on power systems. Such disturbances include sudden change of load, switch in/out of lines and short circuit faults. The most severe is the three phase faults.
Our study will mainly concentrate on transient stability. This part of stability is important considering that it can have major consequences on the system. As an introduction to stability, we need to explore the dynamics equations of the system, namely the swing equation.