Fourteen-band hysteresis controller of the fifteen-level packed U cells converter

In this paper, authors propose a novel fourteen-band hysteresis technique to control the fifteen level packed U cells (PUC) converter. This topology was first introduced. It combines advantages of the flying capacitor and the cascaded H-bridge topologies. The study of the novel converter allows the establishment of the switches gates signals equations. In case of rectifier operation, the proposed fourteen-band controller is designed to draw a sinusoidal line current with a unity power factor. Harmonics contents of line current and rectifier input voltage are then very reduced which permits the reduction of the rating of active and passive filters resulting on a very high energetic efficiency and a reduced installation cost. The fifteen level PUC transformerless inverter has the advantage to operate with a single DC source. A fourteen-band technique is performed to control the auxiliary DC buses and to draw a nearly sinusoidal load current. The proposed concepts were verified by simulations performed in the Matlab Simulink and SimPowerSystem environments.