Novel Deadbeat Control for 3-Level Inverter Based 3-Phase 4-Wire Active Power Filter

In this paper mathematical model in d-q-0 coordinates is established for 3-phase 4-wire active power filter (APF) . A novel deadbeat control scheme for 3-phase 4-wire APF is proposed. Utilizing harmonic predictor, the harmonic current at the coming sampling instant can be predicted accurately. Meanwhile, the sufficient condition for keeping the repetitive harmonic predictor stable is proposed for the first time in this paper. The simulation results indicate that the steady-state accuracy and dynamic response of 3-phase 4-wire APF are both satisfying when the proposed control scheme is implemented.