摘要：The significant issue with industry and domestic applications is the remarkable
performance indices of devices due to poor power quality. The sheer cause of above
cited issue is the presence of harmonics introduced in the line current. There are
many background reasons of harmonics generation; one of them is the extensive use
of non-linear loads in our daily life utility. In this work, an appropriate shunt active
filter is designed to generate the current which is equal in magnitude and opposite in
phase to the harmonic component of line current. The main source converter,
operating for rectification, is actually acted as a nonlinear load for mains.
Therefore, a semiconductor switching device is employed to design a voltage source
inverter. It is connected in parallel to the main source converter. The gate pulse of
the switching device is controlled using a PID controller. The preciseness of the
attempt is synchronized parametrically to get the line current becomes free from
harmonics and sustain sinusoidal shape. The complete concept is modelled and
simulated on MATLAB software. It is observed that initially with linear load the line
current is sinusoidal with .02% THD. When a non-linear load is connected to the
same supply, the line current becomes distorted with 92.32%THD, which is reduced
significantly through proposed methodology to 0.49%. This falls under the permissible
limits of acceptable distortion as per IEEE standard 519.
关键词：Power factor correction (PFC); PID controller; Power quality; Total Harmonic Distortion;
(THD); Active Power Filter; MATLAB/Simulation.
