Fuzzy logic control schemes for static VAR compensator to control system damping using global signal

This paper presents a simple way of achieving damping of phase angle oscillations and improving transient stability of an interconnected power system network using fuzzy logic. The output of the fuzzy logic controller is fed to an already existing Static VAR compensator (SVC). Different input measurements and their combinations are tested and the effectiveness of the fuzzy controller for achieving stability has been demonstrated on a four-generator, two-area system using simulation studies. The inputs tested are line power, angular speed, machine angle, frequency and combination of these. The paper also compares the damping effectiveness of the fuzzy controlled SVC (FCS) and a conventional power system stabilizer (CPSS). (C) 2003 Elsevier Science B.V. All rights reserved.