DYNAMIC ANALYSIS OF SMALL-SIGNAL VOLTAGE INSTABILITY DECOUPLED FROM ANGLE INSTABILITY

This paper presents a methodology for dynamic analysis of short term s mall signal voltage instability in a multi-machine power system. The f ormulation of the problem is done by decoupling the angle instability from the voltage instability. The method is based on the incremental r eactive current flow network (IRCFN), where the incremental reactive c urrent injection at each bus is related to the incremental voltage mag nitude at all the buses. Small signal stability using the eigenvalue a nalysis is illustrated utilizing a single-machine load bus (SMLB) and three-machine system examples. The role of a static var compensator (S VC) at the load bus is also examined. Copyright (C) 1996 Elsevier Scie nce Ltd.