Article,
Harmonic Minimization In Multilevel Inverters By Using PSO
International Journal on Control System and Instrumentation, 2 (3): 6 (October 2011)
Abstract
Harmonic Elimination in a multilevel inverters is
an optimization problem which is solved by applying particle
swarm optimization (PSO) technique. The derived equation
for the computation of total harmonic distortion (THD) of the
output voltage of the multilevel inverter is used as the objective
function in PSO algorithm. The objective function used is to
reduce the THD of the multilevel inverter and obtain the
corresponding switching angles with the elimination of
possible lower order harmonics. In this paper a pseudo code
based algorithm is proposed to deal with inequality constraints
which will helps in accelerating the optimization process. The
proposed method is applied for seven level cascade inverter to
eliminate the 5th and 7th order harmonics to reduce the total
harmonic distortion .This proposed PSO algorithm is effective
in reducing the total harmonic distortion corresponding the
range of modulation index. The simulation results shows that
the proposed PSO method is indeed capable of obtaining
higher quality of solutions to eliminate 5th and 7th order
harmonics and to reduce the total harmonic distortion of 7-
level cascade inverter
