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  CASCADED MULTILEVEL INVERTER WITH SERIES CONNECTION OF NOVEL H-BRIDGE BASIC UNITS

  CASCADED MULTILEVEL INVERTER WITH SERIES CONNECTION OF NOVEL H-BRIDGE BASIC UNITS

ABSTRACT:

          In this project, a new single-phase  cascaded  multilevel inverter based on novel H-bridge unit  is proposed. In order to generate all voltage levels (even and odd) at the output, nine different algorithms are proposed to  determine the  magnitudes of dc voltage sources.  Then, the proposed algorithms are compared to investigate their advantages and disadvantages. This topology is able to increase the number of output voltage levels by using lower number of power electronic devices such as switches, power diodes, driver circuits and dc voltage sources  that lead to reduction in installation space and cost of the inverter. In addition, in  the proposed cascaded multilevel inverter, not only the number of required  power  electronic devices  is reduced but also  the amount of  blocked  voltage  on switches  and  the  number of different voltage amplitudes of the used sources  is decreased. These features are some of the most important advantages of the proposed topology.  These features are obtained via the comparison of the proposed topology  and its proposed algorithms with the conventional cascaded multilevel inverters that have been presented in the literatures.

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