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04/04/2022

Compare : Dynamic Stability and Transient Stability

 

Stability

  • The stability of the power system is ability of system to regain stable state after being some form of disturbance.

Instability

  • Out of step or loss of synchronism

The power system stability can be classified as

( 1 ) Steady state stability

( 2 ) Dynamic state stability

  • Small disturbance is continuously occurring on the power system, which does not cause the system to lose synchronism but it causes natural oscillations. It is called as dynamically stable state. 
  • The system amplitude increases to certain level and die out quickly. 
  • The oscillating amplitude are large and persists for long time for 5 to 10 second and up to 30 second. 
  • This type of stability creates serious threat to power system operation.
  •  The dynamic stability can improve by power system stabilizers. 
  • The study of dynamic stability is done by computer simulation.

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Transient state stability

  • The transient state stability is defined as the ability of power system to return its original stable state after large disturbance. 
  • It may be fault on the system, sudden change of load, switching operation etc. 
  • It also causes large changes in power angles, rotor speed and power transfers. 
  • The machine falls out of step due to sudden large disturbance is called as transient state instability. 
  • This type of large disturbance occurs in very short time period of one second. 
  • The transient state instability is always less than the steady state stability.
  •  It depends upon type of fault, location of fault, rapidity of clearing fault and method of clearing.

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