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A single-phase cascaded multilevel inverter based on a new basic unit with reduced number of power switches

Category : Power Electronics


Sub Category : DC TO AC CONVERTERS (INVERTERS)


Project Code : ITPW20


Project Abstract

In this paper, a new single-phase cascaded multilevel inverter is proposed. This inverter is comprised of a series connection of the proposed basic unit and is able to only generate positive levels at the output. Therefore, an H-bridge is added to the proposed inverter. This inverter is called the developed cascaded multilevel inverter. In order to generate all voltage levels (even and odd) at the output, four different algorithms are proposed to determine the magnitude of dc voltage sources. Reduction in the number of power switches, driver circuits, and dc voltage sources is the advantage of the developed single-phase cascaded multilevel inverter. As a result, the installation space and cost of the inverter are reduced. These features are obtained by the comparison of the conventional cascaded multilevel inverters with the proposed cascaded topology. The ability of the proposed inverter to generate all voltage levels (even and odd) is reconfirmed by using the experimental results of a 15-level inverter.

EXISTING SYSTEM

 

PROPOSED SYSTEM

                                   

It cannot generates all voltage levels with less THD.

 

It can generates all voltage levels with less THD.

Neutral clamped or flying capacitor multi level inverter technique used.

 

Cascaded h bridge multi level inverter technique used.

 

Neutral clamped or flying capacitor multi level inverter technique used.

 

The developed proposed cascaded topology requires less numbers of IGBTS, power diodes, driver circuits.

less efficiency

 

high efficiency

 

 
 
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