Design and Development of a Simulation Model of Harmonic shunt Active Filter using SPWM Current Control Technique

Abstract

Increase in the usage of power Electronic devices for different applications like SMPS, VFD's, Renewable Energy sources etc. has led to highly distorted currents in the power system. Such currents introduce harmonics in the system. These distorted currents flowing through system impedance result in distorting the voltage waveforms. Passive filters used for reducing the impact of these harmonics also affect the power system adversely. Active filtering techniques have now been widely adopted for many of the applications in order to cancel the harmonic and/or reactive components in real time and reduce the value of THD of the source current and make power factor unity. In this paper a simulation model is designed and tested in Matlab Simulink. Three single phase rectifier bridge supplying an R-L load is considered as the non-linear load. A 3- phase voltage source Inverter of 2 kVA rating is current controlled to supply the compensating current at the PCC. Significant reduction in THD of source current was obtained.