Abstract
Multilevel inverters are proficient in achieving a high-quality staircase output voltage waveform with a lower amount of harmonic content. In this paper, a new hybrid multilevel inverter topology based on the T-type and H-bridge module is presented. The proposed topology aims to achieve a higher number of levels utilizing a lower number of switches, direct current (dc) voltage sources, and voltage stresses across different switches. The basic unit of the proposed single T-type and double H-bridge multilevel inverter (STDH-MLI) produces 15 levels at the output using three dc voltage sources. The proposed topology can be extended by connecting a larger number of dc voltage sources in the T-type section. The nearest level control (NLC) switching technique is used to generate gate pulses for switches to achieve a high-quality output voltage waveform. In addition, a simplified way to achieve NLC is also described in the paper. A detailed comparison with other similar topologies is provided to set the benchmark of the proposed topology. Finally, experimental work is carried out to validate the performance of the proposed topology.
Highlights
Over the past two to three decades, multilevel inverters have become a favorite choice for industrial applications due to their advantages, such as better output voltage quality, reduced electromagnetic interference (EMI), a lower voltage rating of switches for higher voltage generation with high efficiency, and a decrease in the size of the filter compared to their two-level counterpart.Multilevel inverters (MLIs) arrange the power electronics components and direct current voltage sources with or without capacitors to achieve an output voltage waveform close to a sinusoidal waveform
This paper proposes a new hybrid multilevel inverter topology that combines a T-type MLI and an
This paper presents the working concept of the proposed STDH-MLI, which is a hybrid combination of one T-Type section and two H-Bridges
Summary
Multilevel inverters (MLIs) arrange the power electronics components and direct current (dc) voltage sources with or without capacitors to achieve an output voltage waveform close to a sinusoidal waveform. Three conventional MLI topologies, i.e., neutral point clamped (NPC) multilevel inverter, Energies 2019, 12, 1810; doi:10.3390/en12091810 www.mdpi.com/journal/energies. As the number of levels increases, the number of components increases significantly, i.e., clamping diodes with switches in NPC, flying capacitors in FC, and isolated dc voltage sources in CBH [1,2,3]. A hybrid MLI topology has been divided into two sections. To convert the output of the level generation unit into an alternating quantity, an H-bridge structure is commonly used. Several hybrid MLI topologies that employ an H-bridge have been proposed in the literature. Hinago and Koizumi in [6]
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