Page 59 - IJEEE-2022-Vol18-ISSUE-1

Al-Jrew, Mahmood & Ali
(b)
(c)
(d)
(e)
Fig. 11: Continued.
The THD of the three topologies has been determined
using different value of modulation index Ma as shown in
Fig. 12. The results show that the lowest value of THD can is almost the same using different level shift PWM
be obtained is 29.47% when the modulation index equal to
| 55
1 and can be lowered to 25.74% when the modulation index
equal to 1.1.
Fig.12: THD vs Ma for Proposed, CHB and NPC five
levels inverter
In terms of efficiency, the cascade H bridge inverter
efficiency is 83.03%, while it’s 79.82% for the neutral
clamped inverter. The proposed topology of the five level
inverter reaches 98.09% which is the highest as compared to
the two conventional topologies.
The comparison analysis for the two conventional MLI
topologies has been made under the three different
techniques of level shift pulse width modulation and
different modulation index values. The results of cascade
H-bridge and neutral point clamped MLI are listed and
summarized in TABLE II and TABLE III, respectively.
TABLE II
SIMULATION RESULTS OF CHB FIVE LEVEL INVERTER UNDER
DIFFERENT MA
TABLE II
SIMULATION RESULTS OF NC FIVE LEVEL INVERTER UNDER
DIFFERENT MA
The cascade H-bridge inverter-based LS-PD has a
minimal percentage of THD of 29.23 % and the highest
efficiency of 83.03%. While the highest DC power was
reached using LS-APOD PWM at 7105 w. The RMS voltage
techniques under different modulation index values as shown
in TABLE II.