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This paper deals with the use of shunt active filter to compensate current perturbations produced by non linear loads. To perform the identification of disturbing currents, the so called Instantaneous Active and Reactive Power Method (pq) is used. A Phase Locked Loop (PLL) circuit, locked to the fundamental frequency of the system voltage, is also introduced for eventual mains voltages perturbations.
The output current of the Voltage Source Inverter (VSI) must track the reference currents produced by the pq algorithm. Two fuzzy logic controllers are used to regulate the DC-link capacitor voltage and to control VSI AC output currents, respectively.

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