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In this paper, two new cascaded multilevel inverters based on new capacitor basic unit are proposed. In the proposed topologies, the same numbers of dc voltage source and capacitor are used that lead to decrease the number of required insulated dc voltage sources. In order to generate all positive and negative voltage levels (even and odd) at the output three different algorithms to determine the magnitude of voltage sources are proposed. Minimum number of used power electronic devices and lower amount of blocked voltage that is made by power switches are two main advantages of the proposed topologies. These features lead to decrease the installation space and total cost of the inverter. These are obtained by comparing the proposed topologies with several capacitor based cascaded multilevel inverters. In addition, in order to balance the used capacitors’ voltage, a new charge balance control method is proposed. Finally, the correct performance of the proposed cascaded inverter is reconfirmed through experimental and simulation results on a five-level proposed inverter in EMTDC/PSCAD software program.
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