Abstract
A Switched-Capacitor Multilevel Inverter (SCMLI) topology is proposed here, which can generate up to fifteen levels with one unit and can be extended further for getting higher levels. The proposed SCMLI has a lesser number of switching devices with respect to other recently proposed structures presented in this paper. It also has the capacitor self-balancing property. Power loss analysis has also been done using PLECS software. Maximum efficiency of 96.33 % has been achieved. A generalized comparative study has also been carried out with the newly presented topologies in different research articles considering several parameters. In order to validate the structure presented in this paper, simulation is done in Matlab <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">®</sup> 2018a, and the simulation results obtained are verified using an experimental prototype.
Highlights
Inverters play a very crucial role in various industrial applications
Enhanced power quality requirements in various industrial applications have led to the manifold increment in the research field of multilevel inverters, as conventional inverters have limitations in fulfilling these requirements
To mitigate the problems mentioned above in conventional MLIs and reduced device count MLIs, Switched-Capacitor Multilevel Inverter (SCMLI) have come into the picture
Summary
Inverters play a very crucial role in various industrial applications. Enhanced power quality requirements in various industrial applications have led to the manifold increment in the research field of multilevel inverters, as conventional inverters have limitations in fulfilling these requirements. To remove the problem of capacitor voltage unbalance in conventional MLIs, some complex control algorithms have been developed, or auxiliary circuits having multi-output boost converter have been added to the inverter structure [11]-[14]. These capacitor voltage balancing methods result in the increment of weight, complexity, and overall cost of the inverter. This paper proposes a new cross-connected asymmetrical SCMLI topology with a low voltage power switch for a singlephase system. This topology has the merit of a lesser component requirement. The performance of the proposed topology is verified by comparing DC supply count, number of switches, and switch stress with several other topologies
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