Instantaneous Power Compensation in 3-Phase System UsingShunt Active Filter

Abstract

The continuous increasing use of power electronic
device in power system creates pollution issues in the system.
Most of the power quality issues is power system are due to the
use of nonlinear loads as they introduce current harmonics in the
system. These loads will continue affecting the quality of power
system which can cause problems such as low power factor,
distortion of wave shape of supply due to introduction of
harmonics. The traditional method for mitigation of harmonics
current due to non-linear load that is use of passive filter is
proving to be insufficient because of more use of power
electronics device in every field and also due to some
disadvantage of them such as problem of resonance with the
impedance of network. So new approaches were developed to
mitigate the effect of harmonics in power system due to nonlinear load current, out of which active filters got the attention of
engineers for solutions of power quality problems. Shunt active
filters are efficient devices to solve for problems related to
current harmonics and series active filters are capable to solve
problems related to voltage harmonics. Shunt active filters
compensate for current harmonics by injecting equal but
opposite compensating current. the system with rectifier is
simulated and instantaneous power theory (p-q theory) for shunt
active power filter is validated for harmonic reduction.