In this paper the Imperialistic competition
algorithm (ICA) is used to minimize harmonic components of
the output voltage up to 75th harmonic in a multilevel inverter
structure with unequal DC sources by the means of selected
switching angles. As the number of switching angles increase,
it becomes more difficult to calculate the optimum switching
angles in order to minimize THD, so the ICA method is used
to find the global optimum of the search space. In addition,
the topology used in this multilevel converter is an optimum
topology with maximum number of output voltage steps while
the number of switches is constant.
