Selective Harmonic Elimination (SHE) is very widely applied
technique in the control of multilevel inverters that can be
used to eliminate the low order dominant harmonics. This is
considered a low frequency technique, in which the switching
angles are predetermined based on solving a system of
transcendental equations. Iterative techniques such as NR and
Heuristic techniques such as GA and PSO have been used
widely in literatures for the problem of SHE