A_Single-Phase_35-levels_Cascaded_PUC_Multilevel_Inverter_Fed_by_a_Single_DC-Source


                         This work proposes a new multilevel inverter topology composed of a PUC5 and an MPUC7 convert cascaded connected fed by only one dc power source by using a highfrequency link. This topology can provide 35-level voltage by using four asymmetrical dc-links, and only twelve power switches. The second dc-link operates as a floating capacitor, while the two smaller dc-links are supplied by the dc-source through a high-frequency transformer (HFT) rated at 7.6% of the total load power when operating at nominal voltage. A self-balance sensor-less strategy is integrated into the switching control and is used to control the voltage of the floating capacitor while the HFT balances two dc-links providing the required power flow. A Nearest Level Control (NLC) and an analysis of power distribution among each dc-link are presented in detail. Besides, comparisons with other multilevel topologies using HFT are carried out. Experimental results are presented to validate the proposed inverter and its floating capacitor control. Index Terms—Multilevel Inverter, Packed U-Cell, S

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