Electric
vehicles are in demand in recent days due to depleting conventional energy
resources. Electric vehicles which are environmental friendly are set to
increase on road in coming days. The Electric vehicles which consist of electric
drive systems are made up of electric motors, inverters and batteries. There is
a need to increase their output quality while decreasing their size and cost.
The multilevel inverter plays a vital role in improving the quality of the
output voltage of the inverter. This paper presents the implementation of
Elliptical Phase Disposition Pulse Width Modulation (EPD PWM) technique for
higher level of Cascaded H-Bridge Multi Level Inverter (CHBMLI). The
performance of 5, 7 and 9-level CHBMLI with proposed EPD PWM scheme is analyzed
for three-phase RL-load. The simulation results prove that the voltage %THD
reduces from 28.09 to 12.85 to 9.69 and current %THD reduces from 25.58 to
10.22 to 9.42 as the number of inverter output level increases from 5-7-9 level
respectively. The simulation is carried out on MATLAB/ SIMULINK platform and
the results were compared with conventional method to validate the proposed
scheme. The simulation results prove that the novel EPD-PWM technique can be
used to effectively control the CBHMLI.
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