A DC Hybrid Active Power Filter and Its Nonlinear Unified Controller Using Feedback Linearization

In the current power system, conversion between dc and ac is widely existing dc-side harmonic problem prominent. To suppress second-harmonic at side of a single-stage single-phase inverter, hybrid active filter (DC-HAPF) structure presented, which composes bidirectional dc-dc circuit-based (APF) CL passive filter. this article, used to mitigate high-frequency harmonics APF applied compensate low-frequency current. Meanwhile, influence parameters on suppression analyzed based average switching model. addition, for control DC-HAPF, nonlinear unified controller via feedback linearization proposed, where voltage dual-loop converted single-loop energy. By analyzing system stability DC-HAPF's performance, appropriate are selected. verify feasibility proposed topology strategy, 500-W inverter with DC-HAPF built good performance has been achieved.