|Pankaj Nautiyal||Rohit Kumar Verma|
|LNCT, Bhopal||LNCT, Bhopal|
Abstract: High performance grid-tied inverters have stringent control requirements both under steady-state and under transient conditions. Many different control systems can be applied to grid-tied inverters. High quality voltage and current are required when PV generator is connected to grid utility. To this, multilevel inverters can be used as connection interface. Efficiency enhancement scheme of a multilevel grid-connected inverter for renewable energy generation systems is researched in detail. This paper has widely reviewed the existing MLIs came to under the categories of Symmetric, Asymmetric, Hybrid and Single DC source based structures, realizing high-quality output waveform being specially designed for medium to high-power applications. Thereby a detailed investigation have been done for each topology and category. Further enhancement can be done by using MPPT algorithms.