Active Power Filter Control in Three-Phase four-wire Systems using Space Vector Modulation

In this paper, by extending space vector modulation (SVM) technique to three-phase four-wire systems, a new strategy is developed for the control of active power filters (APFs). It is shown that the conventional SVM method cannot compensate for the current in the neutral wire in a three-phase four wire system. Simulations have been performed using PSCAD/EMTDC software. Simulation results are provided to prove the ability of the proposed technique in compensating the zero-sequence current.