B.Indhumathi1
, R.Beula2
1PG student- Department of EEE - G.K.M College of Engineering and Technology, Chennai, India
2Assistant Professor- Department of EEE
- G.K.M College of Engineering and Technology, Chennai, India
The
Intensive use of Power Converters and other non-linear loads, result in an increasing deterioration of the power systems voltage and current waveforms.
The presence of
harmonics
in the power lines results in greater power losses in distribution. To suppress the harmonics,
filters are used. The Active Power Filter uses a voltage
source inverter to produce the harmonic current components
that
cancel the harmonic components
due
to non-linear loads. The switching of the power electronics
devices in the shunt active power filter is based on reference compensation
current, which is determined by different algorithms. In this project, simulation
setup has been
developed using
MATLAB and performance of
three-phase
shunt active power filter is studied using different
control techniques that are used to generate the reference
compensation current, namely instantaneous active and reactive (p-q) theory and synchronous detection
method for the control of reactive
power and harmonics. Reference current generated by each of the above method is compared with the actual current fed by the VSI circuit and gate pulses of the VSI are modified
so that the
actual current is equal to the reference current. A comparison is
given
for different values of load. Capacitor voltage is kept
constant by another closed loop with PID controller. Simulations
results are obtained for the two methods. From the simulation
result it is observed that the total harmonic distortion
factor has been decreased nearly to10%
as compared to system without shunt
active power filter and the power factor is also improved.
