In this paper, the authors propose a novel six-band hysteresis technique to efficiently control the seven-level packed U cells (PUC) converter. The proposed PUC combines advantages of the flying capacitor and the cascaded H-bridge topologies. The novel control strategy is proposed in order to insure a good operation of the PUC converter in both inverter and rectifier modes. 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 very low which permits the reduction of the active and passive filters ratings resulting on a very high energetic efficiency and a reduced installation cost. The proposed concept was validated through experimental implementation using real-time controller, the DS1103 of dSpace.
In this paper, authors propose a novel competitive multilevel topology. It combines advantages of the flying capacitor and the cascaded H-bridge topologies. It presents several advantages which will be thereafter detailed. The proposed topology is characterized by a reduced impact on the utility supply, a good energetic efficiency and a small number of switches and passive components. It presents also the possibility and the simplicity of changing the number of voltage levels only by acting on-line on the ratio of the desired output voltages. An average model of the proposed topology is performed and the control strategy is designed to draw a nearly sinusoidal current in order to avoid the use of filters. The modeling and control strategy of the proposed topology were verified by simulation.
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