Abstract
The inceptions of multilevel inverters (MLI) have caught the attention of researchers for medium and high power applications. However, there has always been a need for a topology with a lower number of device count for higher efficiency and reliability. A new single-phase MLI topology has been proposed in this paper to reduce the number of switches in the circuit and obtain higher voltage level at the output. The basic unit of the proposed topology produces 13 levels at the output with three dc voltage sources and eight switches. Three extentions of the basic unit have been proposed in this paper. A detailed analysis of the proposed topology has been carried out to show the superiority of the proposed converter with respect to the other existing MLI topologies. Power loss analysis has been done using PLECS software, resulting in a maximum efficiency of 98.5%. Nearest level control (NLC) pulse-width modulation technique has been used to produce gate pulses for the switches to achieve better output voltage waveform. The various simulation results have been performed in the PLECS software and a laboratory setup has been used to show the feasibility of the proposed MLI topology.
Highlights
Nowadays, multilevel inverters are getting more attention in many industrial and renewable energy applications
There is a requirement of large number of isolated DC power supply in CHB topology which increases with the number of levels in the output voltage waveform while FC-multilevel inverters (MLI) requires a complex control mechanism to ensure that the voltage across the capacitor is maintained constant
The performance analysis of the basic unit of the proposed topology has been done and the comparative results with some recently proposed topologies in literature have been presented in the paper
Summary
Multilevel inverters are getting more attention in many industrial and renewable energy applications. Designing newer MLI topology derive its motivation to reduce the count of isolated DC power supply, switch and gate driver requirement Based on these parameters several topologies have been presented in the literature [6]–[8]. A bidirectional multilevel inverter topology has been proposed in [18] which has asymmetric as well as symmetric configurations having a fewer number of DC power supply and lesser driver circuits and power electronic switches requirement. For the basic unit of the proposed MLI topology, the maximum voltage stress across each switch is given as: VS1. NLC has been used for controlling the output voltage of the proposed basic unit of the multilevel inverter. The modulation index (MI) can be varied in NLC by changing the Vref and can be defined in (12)
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