Literature Survey

Abstract

This chapter gives a clear idea about what is meant by a power system and its behaviour under different electrical and mechanical variations in power system components. Reasons for occurring power system instability situations, their effects on the power system in-turn are highlighted. In order to maintain a quality and reliable power supply through Primary, Secondary and Tertiary control these instability situations due to perturbations in a medium size power system can be effectively addressed and it is broadly discussed. The first few seconds of frequency degradation and recovery after a major generator trip is essentially be accomplished by governor control. When the power system’s self-regulation is insufficient to establish a stable state, the system frequency will continue to drop until it is arrested by automatic under-frequency load shedding to re-establish the load-generation balance within the time constraints necessary to avoid system collapse. Different suggestions for Under Frequency Load Shedding to maintain stability of the power system by various researchers are also high-lighted and reviewed in this chapter.