Design Method to Reduce the DC Link Voltage of a Three-Wire Three-Phase Hybrid Active Power Filter

The hybrid active power filter is one of the topics most discussed by researchers concerning power quality issues. However, most of the works presented in literature do not deal with the design of the hybrid active power filter's components. Thus, this paper proposes a design method of a shunt hybrid active power filter used to compensate for a non-linear load connected to a three-wire three-phase network. The methodology is based on the superposition theorem and the instantaneous power theory. This method is performed in such a way to ensure a low voltage at the DC bus, compared to the DC voltage value commonly adopted in voltage-sourced inverters. Therefore, the ratings of the active power filter are reduced. Results of digital simulations are presented in order to validate the design method proposed in this paper.