The reference active source current for active power filter in an unbalanced three-phase power system via the synchronous detection method

This paper describes the method of applying the concept of trigonometrics in the synchronous detection method to measure and calculate the reference active source current in an unbalanced three-phase system for an active power filter. A new approach based on the synchronous detection method is proposed for a three-phase four-wire system to achieve the reference active source current with pure sinusoidal, in-phase to source voltage and no neutral line current. The proposed method is formulated with strong supports of simulation results and test results with circuit hardware implementations