This article deals with harmonics compensation with a four-leg structured active power-line conditioner (APLC) in three-phase four-wire distribution feeders (TPFWDFs). The instantaneous power flowing into the APLC shows that the constant DC-capacitor voltage-control (CDCVC) of the four-leg structured APLC obtains balanced and sinusoidal source currents with a unity power factor (PF) at the point of common coupling (PCC). A reduced-scale experimental model is constructed and tested. Experimental results demonstrate that balanced and sinusoidal source currents with a unity PF at the PCC are achieved with the CDCVC-based method of the four-leg structured APLC, compensating harmonic, unbalanced-active, and reactive currents in TPFWDFs.

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