Abstract
With the extensive use of power electronics equipment such as rectifier, inverter etc. in
power system generates major difficulty related to power quality. One of such difficulties is creation of
current and voltage harmonics producing distortion of load waveform, voltage fluctuation, voltage
drop, heating of equipment etc. Harmonic current sources, such as computer power supplies,
fluorescent lamps with electronic ballasts, elevator drives, and electronic devices using Switch mode
power supplies, are commonly found in commercial, institutional, and medical buildings. Active power
filters (APF) are the most practical method for harmonic reduction and can be utilised in a variety of
situations. In this study, a digital active power filter is used to eliminate harmonics in the source
current in a grid system with a non-linear demand. Nonlinear loads are an important component of
any power system. With the advent of power electronics, switching elements now account for a