Abstract
It is difficult to make a structure of multilevel inverter for the efficient conversion of dc to ac having a smaller number of power electronic components, less switching losses, less voltage stress on switches, and a greater number of output voltage levels. To breakthrough this problem, a modification is performed in the existing H-bridge multilevel inverter to form a switch ladder modified H-bridge multilevel inverter (SLMHB-MLI). Moreover, for the minimization of maximum voltage rating on the switches and optimization of switching sequence of the multilevel inverter, a novel pulse width modulation (PWM) technique is proposed in this research. Furthermore, in SLMHB-MLI, the novel PWM technique is integrated with an ANDed PWM technique for the variation of output voltage magnitude. The usefulness of the proposed topology and PWM technique are confirmed via comparison with previous topologies simulation and experimentation, respectively.
Highlights
Over the past few years, multilevel inverters (MLI) play a vital role for the conversion of DC to AC in industrial and renewable energy applications [1]
The optimized switching sequence in novel pulse width modulation (PWM) technique is selected by the process of comparison between VR and voltage magnitudes (VI) to make the output of the MLI overlapping the ideal sine wave incorporating the minimum switching losses
The SLMHB-MLI is tested on the resistive load having power factor (PF) of unity
Summary
Over the past few years, multilevel inverters (MLI) play a vital role for the conversion of DC to AC in industrial and renewable energy applications [1]. To mitigate the problem of symmetric and asymmetric complexities of DC sources, a new structure is developed in [36] It comprises of a large number of components and DC sources when compared with the new topology of modified H-bridge MLI as presented in this paper. This topology has unequal voltage distribution across its switches, which restricts it for high voltage applications Another new topology of symmetric MLI is presented in [38] which has optimized structure regarding number of components. In [39], a new structure is developed based on the concept of hybrid MLI to boost the magnitude of the output voltage This topology has a large number of power electronic components which makes it more complex and impractical due to more switching losses. These capacitors play a vital role for the generation of a large number of voltage levels at the output
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