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Fuzzy Logic Controller for Three-phase Shunt Active Filter Compensating Harmonics and Reactive Power Simultaneously L. Zellouma and S. Saad, Laboratoire des Systèmes Electromécaniques, University of Badji Mokhtar-Annaba-Algeria Email: [email protected] Abstract This paper presents a fuzzy logic as a control technique applied to a voltage source inverter operating as an active filter. This active filter compensates harmonic current and reactive power of nonlinear loads simultaneously. The proposed scheme uses a pulse width modulation (PWM) technique to generate the switching signals to the active filter, p-q theory for harmonic current identification and fuzzy logic for active filter current and DC capacitor voltage control. The operation and design of power and control circuit of active filter are analyzed and discussed. The obtained results using MATLAB power system blocks showed that source current is sinusoidal and in phase with source voltage. The proposed solution has achieved a low total harmonic distortion demonstrating the effectiveness of the presented method. Key words: Fuzzy logic control, Harmonics, Reactive powercompensation, PWM control, Shunt active power filter.