Critical analysis on cascaded T-type multilevel inverter topology to grid-integrated photovoltaic systems for symmetrical voltage ratios

Chandramouli Adupa () and V. Sivachidambaranathan ()
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Chandramouli Adupa: Sathyabama Institute of Science Technology
V. Sivachidambaranathan: Sathyabama Institute of Science Technology

International Journal of System Assurance Engineering and Management, 2022, vol. 13, issue 3, No 34, 1474-1484

Abstract: Abstract Among the various reduced switch multilevel inverter (MLI) topologies, T type topology has got appreciable reduction in switch count. However, features of T-type such as absence of switching redundancies, inability to support the asymmetry, high device ratings, and inability to support equal utilization of dc-link has limited its implementation for grid-integrated photovoltaic (PV) system applications. To overcome this, cascaded T-type topologies emerged as the prime solution. The work presented in this paper describes the implementation of cascaded T-type MLI topology including its symmetrical and asymmetrical configurations with a simplified carrier based PWM scheme. A critical analysis on the cascaded T-type MLI is also presented by considering the switch count. From the results, we conclude that the cascaded T-type MLI topology obtains satisfactory phase voltage along with the improved harmonic profile compared with the other MLI topologies.

Keywords: Photovoltaic (PV) system; Cascaded H-bridge inverter (CHB); T-type multilevel inverter (MLI) Topology; Cascaded T-type topology; And simplified carrier based PWM scheme (search for similar items in EconPapers)
Date: 2022
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DOI: 10.1007/s13198-021-01491-3

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