Power Quality Enhancement for DFIG System by Using Hybrid Fuzzy Logic Controller Based UPQC

Abstract

This paper describes the simulation of an interconnection of grid connected wind power system to analyzes the power quality problems such as voltage sag, swell, flickers, harmonics, etc. by providing the unified power quality conditioner (UPQC). The hybrid fuzzy logic controller is proposed to improve the performance of UPQC to diminish voltage sag, swell and also load current harmonics .The conventional PI control, fuzzy logic control based UPQC can completely mitigates voltage sag, swell but the load current harmonics obtained is not in acceptable limits. The hybrid fuzzy logic controlled UPQC which mitigates the voltage sag, swell and also reduces the load current harmonics/improves the power quality. The performance of hybrid fuzzy logic controlled UPQC is compared with conventional PI and FLC based UPQC from simulation results using MATLAB/SIMULINK.