Damping improvement of oscillation in power system by fuzzy logic based SVC stabilizer

Abstract

This paper presents the capability of fuzzy logic based stabilizer used for generating the supplementary control signal to voltage regulator of SVC for improving a damping of the inter-area mode oscillation in power system. The base system is symmetric that consists of two identical areas connected through a relatively weak tie line. The SVC is chosen to be installed at the midpoint of tie line. The locally available line active power will be used as input signal for the stabilizer. The supplementary signal is calculated using fuzzy membership function in order to determine the quantity of reactive power supplied/absorbed by SVC. The system oscillation is started by a 3-phase-to-ground short circuit occurring at 0.2s of the simulation and subsequently clears after 100ms. Simulation with the sample power system proves that fuzzy logic based SVC stabilizer give a good damping in inter-area mode oscillation for the system when subjected to a disturbance. The effectiveness of stabilizer applied with and without PSS will be investigated as well.