A cascaded multilevel inverter topology with only one bidirectional conducting switch

The most common multilevel inverter topology types are neutral point clamped or diode clamped inverter, flying capacitor inverter and cascaded H-bridge inverter. Among the three, the cascaded H-bridge inverter is becoming the most popular type of multilevel inverter as the world is moving towards renewable energy. The cascaded H-bridge has modular structure, so it can be easily adapted in multiple dc sources system such as photovoltaic systems. The main disadvantage of cascaded H-bridge inverter is it requires a high number of switches, particularly for a high number of output voltage levels design. Another major disadvantage is a high number of switches need to be turned on during cascaded H-bridge operation, thus accumulating voltage drops across the conducting switches before it reach the output terminals, resulting losses and reduced efficiency, especially for a high power installation. In this paper, an uninterrupted neutral line multilevel inverter topology with only one conducting bidirectional switch at any time of operation is proposed. A 41-level version of the proposed topology is constructed and tested in Matlab Simulink platform. The result shows that for a high output voltage levels and high power load, the proposed inverter has a very low output THD level and a minimum internal losses.

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