FIRST SWING AND MULTISWING TRANSIENT STABILITY STUDIES

FIRST-SWING AND MULTI-SWING STABILITY STUDIES PROBLEMS

Transient Stability Studies can be divided into first-swing and multi-swing stability studies problems.

 

FIRST SWING STABILITY STUDIES PROBLEM

The first-swing stability is based on a reasonability simple generator model without representation of control system of the generator. Usually the time period under study is the first second following a system fault. If the machines of the system are found to remain in synchronism within the first second, the system is said to be stable. 

MULTISWING STABILITY STUDIES PROBLEMS

Multiswing stability  problems extend over  a longer study a period and therefore must consider effects of generator control systems which affect machine performance during the extended time period. Machine models of greater sophistication must be represented to reflect proper behavior.

In all stability studies, the objective is to determine whether or not the rotors of the machines being perturbed return to constant speed operation.