Instability of a SVC control system and its investigation based on the bifurcation theory

Abstract

This paper deals with instability of a SVC control system, which compersates reactive power of loads using measurements of voltage and reactive power of the loads. It is found that the SVC control system is characterized by meeting a bifurcation point followed by its instability before the loads reach the so-called nose point. This fact is proved by an invesigation based on the bifurcation theory, and is also supported by simulation studies on an example power system. Motivated by the bifurcation theoretic investigation, a SVC control system using a reference voltage pattern is proposed, which does never bring to such instability.