Implementation of DVR for Power Quality Improvement using Matlab/Simulation

Implementation of DVR for Power Quality Improvement using Matlab/Simulation
Authors:DAYNIS TOPPO

Abstract: This paper Presents Simulation study of Dynamic Voltage Restorer based on Photovoltaic system. A Photovoltaic based DVR is used to mitigate the problems of voltage sag and swell. The Maximum Power Point Tracking Algorithm and DCDC converter is used to extract maximum power from the Photovoltaic system. A Hysteresis based Control strategy is adopted for switching the voltage source Inverter of DVR. Perturb and Observation method is used as MPPT algorithm. When the grid is in normal operation DVR works for reducing the problems of voltage sag and swell, when the grid fails DVR works as Uninterrupted power supply(UPS) The proposed system is simulated in MATLAB/SIMULINK and the simulation results show that the proposed PV based DVR can efficiently reduce the problems of Voltage sags and swells. 

Keywords: DVR, Sag, Swell. 

INTRODUCTION 

       The rapid trend of industrialization of nations, increased interest in environmental issues led recently to explore the use of renewable forms such as solar energy. Photovoltaic (PV) generation is gaining increased importance as renewable source due to its advantages like absence of fuel cost, no noise and wear due to absence of moving parts and little maintenance etc. There is very small work done until now related to PV based Dynamic Voltage Restorer until now. Sinusoidal voltage at the contracted magnitude and frequency. However, in practice power system especially the distribution system, have numerous non linear loads, which are significantly affect the quality of power supply. As a result, the purity of waveform of supply lost. This ends up producing many power quality problems. To improve power quality, custom power devices are used. In 1995 the concept of custom power is first explained by Hingorani [1]. The thought of custom power (CP) identifies with the utilization of electronic controllers for power system network. There are number of custom power units which are given below, Distribution Statcom (DSTATCOM), Dynamic Voltage Restorer (DVR), Unified power quality conditioner (UPQC), Active Power Filters, Battery Systems (BESS), Distribution Series Capacitors (DSC), Surge Arresters (SA), Un-interruptible Power Supplies (UPS), Solid State Fault Current Limiter (SSFCL), Solid-State Transfer Switches (SSTS), and Static Electronic Tap Changers.

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