Study on Enhancement of Output of Grid Tied PV Systems under Symmetrical and Asymmetrical Faults

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 highpower
applications. Thereby a detailed investigation have
been done for each topology and category. Further
enhancement can be done by using MPPT algorithms.