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This paper presents a application of PSO to Hybrid active power filter used to compensate for total harmonic distortion in threephase fourwire systems. The shunt active filter employs a simple method for the calculation of the reference compensation current based on Fast Fourier Transform. The presented Shunt Active Power filter is able to operate in balanced, unbalanced and Variable load conditions. Classic filters may not have satisfactory performance in fast varying conditions. But auto tuned active power filter gives better results for harmonic minimization, reactive power compensation and power factor improvement. The proposed auto tuned shunt active filter maintains the THD well within IEEE519 standards. The proposed methodology is extensively tested for wide range of different Loads with Improved dynamic behavior of shunt active power filter using PSO to Hybrid active power filter. The results are found to be quite satisfactory to mitigate harmonic Distortions, reactive power compensation and power factor correction thereby increase in Power Quality improvement and reduction in %THD.
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