GSA-FL Controller for Three Phase Active Power Filter to Improve Power Quality

The power quality decline is still an unsolved problem caused by the increased power electronic load getting into the system. As a solution to the power quality problems in utility, industrial and commercial applications ,the use of active power filters is vastly accepted and implemented. This paper presents a fuzzy logic controlled shunt active power filter used to compensate harmonic distortion and increase power factor to produce a high power quality in three-phase systems. Fuzzy logic (FL) and optimized fuzzy logic with Gravitational Search Algorithm (GSA-FL) was used to control shunt active power filter . The results show that the injected harmonics are essentially reduced; system efficiency and power factor are improved by two different controllers. When the implemented methods were compared, GSA-FL controller showed better performance in reducing THD and reactive power and also robustness for DC capacitor voltage. MATLAB/SIMULINK power system toolbox was used to simulate the proposed system.