Copyright: © the author(s), publisher and licensee Technoscience Academy. This is an open-access article distributed under the terms of the Creative Commons Attribution Non-Commercial License, which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited International Journal of Scientific Research in Science and Technology Print ISSN: 2395-6011 | Online ISSN: 2395-602X (www.ijsrst.com) doi : https://doi.org/10.32628/IJSRST 462 Performance Analysis of Fuzzy Logic Controller Based DVR for Power Quality Enhancement B. Samhitha 1 , Dr. T. Gowri Manohar 2 M. Tech Student 1 , Professor 2 Department of Electrical and Electronics Engineering, Sri Venkateswara University College of Engineering, Tirupati, Andhra Pradesh, India Article Info Publication Issue Volume 10, Issue 1 January-February-2023 Page Number 462-471 Article History Accepted: 01 Feb 2023 Published: 16 Feb 2023 ABSTRACT This paper presents a fuzzy logic controller (FLC)-based dynamic voltage restorer (DVR) to reduce power quality (PQ) issues in the distribution system (DS). The FLC-DVR injects voltage into the line to maintain voltage stability in the DS. The DVR is a Series FACTS device, which is connected in series with the system to improve power quality. The FLC is a novel control method to control the operation of a DVR. By using the FLC controller, the DVR responds very quickly to disturbances in the DS. The entire proposed system is designed and tested in the MATLAB/SIMULINK software. The updated simulation results show the FLC-DVR is more accurate compared to a conventional PI controller. Keywords : Fuzzy Logic Controller (FLC), Dynamic Voltage Restorer (DVR), Power Quality (PQ), FACTS, Total Harmonic Distortion (THD), Voltage Source Inverter (VSI). I. INTRODUCTION Electrical energy is increasingly acknowledged as a basic necessity for consumers [1]. It is invisible, a commodity that is instantly available. Solar, solar thermal, wind, and other renewable energy sources all use renewable energy systems (RESs) to help to meet their primary energy needs. The intermittent nature of RESs, harmonics, and reactive power issues causes stability issues in the power system, which halts the performance of the power system [2, 3]. The Flexible AC Transmission Systems (FACTS) devices are widely used in distribution grids for reactive power compensation, voltage stability, and power quality [4,5]. FACT devices, however, also modify certain transmission and distribution system aspects [6]. This paper presents a study of power quality with the goal of determining the root causes of bad power quality and offering remedies for these power quality issues. Computers, laptops, relays, solid-state devices, variable speed drives, and optical devices are a few examples of what is referred to as sensitive equipment. These devices are sensitive to changes in input voltage brought on by interference from other system components. The power system is separated into the following sections: generation, transmission, and distribution.