Minimum DC-link voltage design of three-phase four-wire active power filters

This paper presents a minimum dc-link voltage design for three-phase four-wire center-split active power filters (APFs). According to the current quality data and the APF single-phase equivalent circuit models, the minimum dc-link voltage expression for the APF is deduced and proposed, in which the deduced expression is applicable to single-phase and three-phase four-wire APF systems. Representative simulation results of the three-phase four-wire APF are presented to verify the minimum dc-link voltage expression.