Implementation of Instantaneous P-Q Theory to Improve Power Quality by Shunt Active Power Filter for Non-Linear Loads

Non-linear loads insert harmonics into the electrical power system. Harmonic frequencies in an electrical network are a foremost cause for introducing issues in the quality of power. Most of the power quality troubles are non-stationary in nature and mostly occur when a non-linear load is connected to the source. The Total Harmonic Distortion (THD) itself will be very high and becomes a sizable challenge to maintain the quality of power as desired. In this work, a three-phase supply feeding to a three-phase non-linear load as a diode bridge rectifier (DBR) with resistive load is considered. In this context, the source side will be injected with harmonics because of the non-linear load which is not advisable. Therefore, various techniques are implemented to filter the harmonics across the source side. Orthodox systems are based on a filtering technique and from distorted source current, the fundamental current component is separated. Shunt Active Power Filter (SAPF) is the most collective device to reduce the source current harmonics. The pulses generated for SAPF are through the Instantaneous p-q theory technique. The SAPF model is connected among source and non-linear load which is analyzed by MATLAB/Simulink® and validated the operation experimentally by DS1104 card of dSPACE system integrated into MATLAB. A power quality analyzer (fluke meter) is used to evaluate the source current harmonics in the hardware setup.