Flatness based control of single phase multicellular shunt active power filter for power quality improvement

In this paper, a flatness-based controller for single phase multicellular shunt active power filter topology is proposed, the following control objectives is addressed: i) ensuring the safe operation of the multicellular inverter, which is based on the control of the voltage across flying capacitors; ii) the compensation of harmonics current and reactive power drawn from nonlinear loads by achieving a satisfactory PFC; iii) the regulation of the inverter's DC voltage. To achieve these objectives, two cascaded loops are designed, an outer loop for the DC voltage regulation, where the inner loop is dedicated for the harmonics and reactive power compensation as well as the flying capacitors voltage regulation. The simulation results prove the performances of the proposed controller.