Improvement of transient stability by variation generator parameters and high speed fault clearing

In recent years, power systems have been operated under more stressed conditions and close to their stability limits. Due to recent blackouts, power system security has become a major concern. Under these circumstances, an important problem that is frequently considered for secure operation is the severity of transient stability. This paper presents a study on transient stability of two IEEE test systems. The influence of bus loads, generation changes, network changes and generator parameters variation on transient stability are investigated in this paper. It is shown that transient stability is improved by various parameter changes such as increase in generation, inertia constant, open circuit transient time constant, decrease in transient reactance and decrease in line reactance.