English title

This paper presents a new approach for single-phase shunt active power filter with LCL output filter based on the two-loop control theory. In this method unlike the conventional two loop control, internal loop stability theorem with considering delay effect is studied. Moreover, an observer based on the Kalman-filter is combined with the proposed control scheme, to reducing the numbers of power sensors in the overall system. Finally, the performance of the proposed method is investigated by extensive simulation tests. Simulation results confirm the excellent performance of the proposed control scheme in steady state and transient conditions.