Complexity International Journal (CIJ) Volume 25, Issue 02, June 2021 Impact Factor (2021): 5.6 ISSN: 1320-0682 http://cij.org.in/Currentvolumissue2502.aspx 1613 ENHANCEMENT OF POWER QUALITY IN DISTRIBUTION SYSTEM USING D-STATCOM Dr.K JAGHANNATH 1 Dr.D. KUMARASWAMY 2 P.PAVAN 3 M.NAGARAJU 4 T.SAI KUMAR 5 K.LALITH 6 CH.DINESH BABU 7 B.PRASHANTH 8 1 Associate Professor, Department of EEE, SVS Group of Institutions, Bheemaram, Warangal, T.S- India 2 Professor and HOD Department of EEE, SVS Group of Institutions, Bheemaram, Warangal, T.S- India 3,4,5,6,7,8 UG students, Department of EEE, SVS Group of Institutions, Bheemaram, Warangal, T.S- India Abstract: Nowadays, the term power quality has becoming increasingly concerned by both electric utilities and end users of electrical power. Power quality problems such as transient, short duration variations (sags, swells and interruption), voltage imbalance, waveform distortion (dc offset, harmonics, inter harmonics, notching and noise), voltage fluctuations and power frequency variations can affect the performance of the equipment at consumer. The most affected due to these problems is industrial customers who use a lot of sensitive equipment. They have suffered a huge loss due to this problem. Thus, device such as Static Synchronous Compensator (STATCOM), Dynamic Voltage Restorer (DVR) and Uninterruptable Supply (UPS) has been created to solve this problem. D- STATCOM has it respective limitations such as capabilities and functions. The project will focus on how the D-STATCOM can regulate the voltage in order to improve the voltage sag in the system. A simulation was carried out using MATLAB/Simulink software to obtain the result. When there was an overload in the system, high current will flow through the line and the consequence voltage sag will occur. In order to improve voltage sag, D- STATCOM was connected to the system. In this project, the performance of D- STATCOM both before and after saging will be analyzed Key words: D-STATCOM, Voltage Sags, DVR, Power quality I. INTRODUCTION Our country INDIA is low power quality which caused different problems, one of those problems we fix in our thesis project, knowing that the cost of electricity in India is very high that caused by lack of power quality so our thesis will concentrate how to enhance the power quality , therefore we require high power quality , reliable electrical power and rising number of distorting loads may leads to an increased awareness of power quality both by clients and utilities , the mainly general power quality problems today are voltage sags, harmonic distortion and low power factor. Power quality is one of the most important aspect concerned by utility and residential customer, especially when it becomes a very sensitive issue for industrial consumer. Power quality means the ability to receive pure electrical voltage sinusoidal waveform at delivery point. It is obvious that everyone will aim to gain the excellent quality in every situation no matter