Harmonic Mitigation Using DC Self Supported Shunt Active Power Filter

Abstract

The advent of semiconductor technology has resulted in increased application of power electronic devices in industrial as well as domestic loads, a combination of which acts as a non-linear load. These non-linear loads are responsible for increased harmonics by drawing a distorted current from the supply system, leading to deterioration of source currents and voltages. This work proposes a method to improve the power quality with the aid of a three-phase shunt active power filter (SAPF) implementing a controlled voltage source inverter and synchronous d-q reference current generation technique for reference current generation of hysteresis controller. A discrete PI controller has been implemented to maintain a constant DC capacitor link voltage. The proportional and integral gains of the PI controller have been computed with the help of bacterial foraging optimization technique. The proposed SAPF for a three phase three wire system employing a balanced non-linear load has been simulated on MATLAB software to validate its performance. The simulation results demonstrate satisfactory performance of the proposed SAPF by effectively compensating harmonics of the supply system and lowering THD such that they fall within IEEE 519 standards for harmonic levels.