A Novel Current Controller Technique for Three Phase Shunt Active Power Filter

In this paper a novel control algorithm is implemented for three phase shunt active power filter based on fuzzy logic controller. Harmonics is the predominant power quality issues which have adverse effect on the power system. The most of power quality issues in power system is created by non linear loads. The shunt active power filter is extensively employed to eliminate harmonic current and reactive power compensation. The performance of shunt active power filter depends on the control strategy used for the shunt active filter. Hysteresis Current Controller is widely used due to its simplicity, fast and accurate response and ease in implementation but this leads to high switching losses and injects high frequency harmonic into the system due to its variable switching frequency. This paper provides the frame work for fuzzy based adaptive hysteresis current controller based SAPF which overcomes the problem of hysteresis current control scheme. The proposed control algorithm is found to be superior to meet IEEE 519 standard recommended on harmonics levels. The simulation results, obtained using Matlab/Simulink shows the effectiveness of proposed control algorithm of the three phase shunt active power filter.