Half Wave Control Strategy of Interleaved Buck Converter Based Single Phase Active Power Filter for Power Quality Improvement

This paper presents the dynamics of interleaved Buck converter (IB) used as an active power filter (APF) and proposes a control system that guarantees two objectives: i) compensation of the current harmonics and the reactive power absorbed by the nonlinear load; ii) tight regulation of the DC bus voltage. The proposed control system is based on two cascaded loops: An inner loop is designed to deal with the compensation issue using the half wave current controller. The outer-loop is designed to regulate the output converter voltage using a proportional-integral (PI) regulator. Finally, it is formally demonstrated, through simulation results in Matlab/SimPowerSystems environment that the control strategy achieves desired objectives and it validates the performance of IB-APF.