Designing a New Control Method for Three-Level Active Power Filter

In contrast to the two-level Active Power Filter, the three-level neutral point clamped (ANPC) offers a higher number of output levels, reduced harmonic impact, and diminished equipment losses during harmonic compensation. Nonetheless, the inherent conservatism of single-step prediction limits its reliability to the k+1 time step, failing to provide relevant information for optimizing future steps. Additionally, three-level APF control necessitates concurrent consideration of multiple objectives, resulting in some tracking errors. This study introduces a multistep prediction approach to address these issues. Cycling results in identifying optimal and suboptimal switching states at k+1. Substituting these optimal states at k+2 yields the optimal states across two consecutive control cycles. This method enhances control process reliability, with simulation results demonstrating minimal power grid harmonic content, aligning with the requisite criteria.