ABSTRACT:
In this paper, a 9-level symmetrical modified
multi-level cascaded H-bridge inverter with reduced switch count is considered.
The operation and control of 9-level inverter is discussed. This multilevel inverter
uses four symmetrical DC input sources and twelve unidirectional power
semiconductor switches. The basic operation with
equal width modulation and resistive and Resistive-Inductive loads are verified
with the help MATLAB simulation. The simulation outputs are presented and
confirm the operation of nine level inverter operations. Together with the
traditional topologies and some other inverters, this inverter topology is
capable to produce more number of output voltage levels by means of less number
of power switches and driver circuits. Simulation results confirm the
probability of this inverter topology
KEYWORDS:
1.
Multi-Level
inverter
2.
Cascaded
H-Bridge (CHB)
3.
Reduced
number of switches
4.
Harmonics
5.
Modified
H-bridge (MHB)
SOFTWARE:
MATLAB/SIMULINK
CONCLUSION:
In
this paper, a modified CHB 9-level symmetrical MLI with 4 DC voltage sources
and 12 unidirectional switches was successfully studied with the help of MATLAB
simulation. The operation of this topology of inverter is analyzed. The
simulation results are at satisfactory level.
The
harmonics in the output voltages are comparable with the other topologies in
the literature. This topology of inverter required less number of switches
could assure enhanced performance, efficiency, consistency and decrease in
price and volume of the inverter. The performance of this inverter topology can
be improved by employing harmonic elimination techniques.
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