A three-phase four-wire three-level active power filter based on one-cycle control

In this paper, an active power filter (APF) based on a modified one-cycle control is proposed. This control method can be applied in a three-level three-phase four-wire system. By adding an additional current sensor to detect the fundamental component of the output current, the proposed APF is capable of compensating harmonic components independently from the VAR compensation so that the capacity of APF can be greatly reduced. The viability of the proposed scheme is verified by performing experimental validation.