A novel six-band hysteresis control of the packed U cells seven-level converter

In this paper, authors propose a novel six-band hysteresis technique to control the seven level packed U cells (PUC) converter which was first introduced in. This converter 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 six-band controller is designed to draw a sinusoidal line current (load current in case of inverter operation) with a unity power factor. Harmonics contents of line current (or load current) and rectifier input voltage (or inverter output 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 proposed concept was verified by simulations performed in the Matlab Simulink and SimPowerSystem environments.