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This paper deals with the design, analysis and digital simulation of a novel four-branches-inverter-basedactive-filter, that compensates the reactive power and suppress the harmonic currents in the phases and neutral of a n unbalanced 3-phase 4-wires electrical distribution system, feeding MYDC loads. That is, the filter has the capability to instantaneously suppress the harmonics currents, in both the 3-phases and the neutral, while simultrneously compensating the reactive power in each one of the unbalanced 3-phases, bringing their respective power factor to unity.The novelty of the active filter resides in the use of a 4-branches-DC/AC-inverter acting as the main active compensator. Three branches a r e needed to compensate the three phase currents and one-branch compensates the neutral current. A number of selected simulation results proves a superior performance of this filter when the loads are three onephase rectifiers in one case, and one 3-phase converter with a one-phase rectifier in the other.

This paper presents a digital simulation of an

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