Abstract:
This paper presents the utilization of
multilevel inverter that has been designed to reduce the
circuit complexity and optimizing the use of
bidirectional switches. A new three phase Quasi Z
source multilevel inverter (QZS-MLI) for direct drive
wind turbine generator applications has been proposed.
The proposed inverter consists of an auxiliary circuit,
made up of inductor and capacitor network and 5
bidirectional switches along with the full bridge inverter
configuration. The proposed QZSMLI is able to
produce 7 levels of staircase waveforms with only 2
shared power switches. The output voltage is similar to
the conventional multilevel inverters but with less power
switches and THD. A modified carrier based level
shifted pulse width modulation control strategy has also
been developed. The performance of the proposed
inverter is analyzed through MATLAB/SIMULINK and
the results are verified with experimental setup.
