Performance Analysis of various Power Quality issues and system indices using UPQC and DUAL UPQC

Abstract

Power quality is the major problem in the fast growing electrical systems. Persistent newlineincrease in nonlinear loads causes distortions in the distribution system leading to unbalanced newlinecurrent and voltage waveforms that affect the quality of the power. The major newlinepower quality issues analyzed in this work are related to system parameters such as reactive newlinepower, real power, current, voltage, power factor, total voltage harmonic distortion, newlinetotal current harmonic distortion, positive sequence harmonics, negative sequence harmonics, newlinezero sequence harmonics, interharmonics and subharmonics. Different types newlineof system indices such as phase voltage unbalance rate, voltage dip severity, voltage newlinedip lost energy index, voltage dip energy index, dip score are analysed and compared newlinewith power quality standards. Also the symmetrical / unsymmetrical fault is created in newlinethe distribution system and the power quality issues are analysed with dynamic voltage newlinerestorer (DVR), and conventional unified power quality conditioner (UPQC). Consequently, newlinethe performance analysis of various power quality issues is compared with newlinefour different cases such as conventional UPQC with synchronous reference frame theory newlinebased proportional integral (SRF-PI) controller, conventional UPQC with fuzzy newlinecontroller, Dual UPQC with SRF-PI controller and Dual UPQC with fuzzy controller. newlineThe simulation result shows that the effectiveness of the fuzzy based Dual UPQC controller newlineis superior than the conventional UPQC-PI controller. This work further suggests newlinea fuzzy based modified UPQC (Fuzzy-MUPQC) for the grid integration of photovoltaic newlinesystem. The suggested control strategies are found to be performed satisfactorily in newlinereducing excess load current, voltage dip, minimizing THD and power factor improvement. newline