Abstract
Multilevel inverters (MLIs) have been extensively used and gained interest over last few decades in industrial and grid connected renewable energy applications because of its numerous merits. Besides various advantages like obtaining reduced harmonic distortion and lesser dv/dt stress across switches it has the capability of generating any number of levels. The theory of multilevel concept was initiated for high power and high/medium voltage applications as they are helpful in interfacing with renewable energy sources. By proper combination of the switches it generates a stair case output with reduced harmonic distortion because of this MLI is widely used and it became one of the advanced power converter topology. The rise of new topologies has attained importance over conventional multilevel inverter topologies, which generates more number of levels with reduced switch components. This paper presents various conventional MLI topologies and hybrid MLI topologies for renewable energy applications. Also, this review paper includes different modulation strategies which plays an important role to improve the overall performance of MLI.
Highlights
The increasing demand for electrical energy is the basis for intense reduction in conventional energy sources.This gave rise in extensive research in the field of renewable energy based power generation
These are used in various applications such as renewable energy sources, drives, FACTS and electric vehicles
This topology shown in fig 6 (g) is used for renewable energy applications
Summary
The increasing demand for electrical energy is the basis for intense reduction in conventional energy sources This gave rise in extensive research in the field of renewable energy based power generation. Solar and wind are the major renewable energy sources gaining more interest among power electronics and power systems community [1] [2] [3] This needs new power converter topologies to improve power quality for desired operation, control and power management and to extract maximum power from the renewable energy sources. Fig. shows various conventional and reduced switch MLI topologies. These are used in various applications such as renewable energy sources, drives, FACTS and electric vehicles. A suitable modulation technique has to be chosen in order to improve the overall performance of the system
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