A Comparative Study of Different Multilevel Converter Topologies for High Power Photovoltaic.......

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IJERTV9IS010009
A Comparative Study of Different Multilevel Converter Topologies for High Power Photovoltaic Applications

Priyanka A. Bettawar , Sumit R. Punam

The main goal of this paper is to develop a multilevel converter topology to be useful in photovoltaic system applications. Although many topologies are introduced rapidly using a bunch of switches and isolated dc sources, having a single-dc-source multilevel inverter is still a matter of controversy. In fact, each isolated dc source means a bulky transformer and a rectifier that have their own losses and costs forcing the industries to avoid entering in this topic conveniently. On the other hand, multilevel inverters topologies with single-dc-source require associated controllers to regulate the dc capacitors voltages in order to have multilevel voltage waveform at the output. Thus, a complex controller wouldn't interest investors properly. Consequently, developing a single- dc-source multilevel inverter topology along with a light and reliable voltage control is still a challenging topic to replace the 2-level inverters in the market effectively.

This work investigates modern topology of multilevel converters, which are suitable to be used in high power photovoltaic applications with the main target on achieving lower total harmonic distortion and better efficiency. Multilevel converters offer several advantages compared to conventional types. Multilevel converters provide high quality output while using the low switching frequency. It affects the switching losses, size of semiconductor switches and harmonic filters. This research investigates various topologies of multilevel converter for high power photovoltaic applications. All topologies are simulated using MATLAB/SIMULINK in the same operating conditions. Finally, the more suitable multilevel topology is chosen with reference to the simulation results.