Abstract
This paper presents a single-phase seven-level
stack multicell converter (SMC) which provides a viable solution
for multilevel converter. Conventional cascaded multilevel
inverter (MLI) removes the drawbacks of clamping diodes and
clamping capacitors topologies. However, in a cascaded MLI
number of voltage source and power switches increases as the
number of level increases. The main advantage of single-phase
SMC converter is only two DC sources are needed for any
number of levels. Level shifting SPWM technique has been
incorporated to achieve gate pulses, in which carrier wave of
20kHz is compared with 50Hz sinusoidal reference wave at a
modulation index of 1 and 0.9. Total harmonic distortion (THD)
for SMC converter is achieved at 1.55% and 5.26% with and
without filter respectively. The seven-level SMC topology is
simulated in MATLAB/SIMULINK and simulation results are
provided to verify the performance.