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A non-linear load is supplied by the three phase power supply and shunt active power filter is used

A non-linear load is supplied by the three phase power supply and shunt active power filter is used. Constant instantaneous power method, sinusoidal current control method, Fryze current control technique, and synchronous reference frame methods for active power filter are developed in MATLAB/Simulink environment. The shunt active power filter effectively eliminates the unwanted harmonic content introduced by the non-linear load in the distribution systems.
Source current and compensating currents for all methods are plotted. It is observed that each and every technique is effective in reducing the harmonic content. Results shows that the % THD is under 5 % in all the control methodologies.
From the analysis, it shows that % THD is equal to 3.12 % in synchronous reference frame method, which is superior to the remaining three methods. Finally the proposed control methods for shunt active power filter smoothens the current waveform, voltage imbalance, reduces the % THD of the source current, improves the power factor to the unity, and overall efficiency of the distribution system is improved.