DLF control for high efficiency grid connected PV converters

Abstract

Nowadays there are several grid connected converters in the grid system. These grid connected converters are generally the converters of renewable energy sources, industrial four quadrant drives and other converters with DC link. These converters are connected to the grid through a three phase bridge. The standards prescribe the maximal harmonic emission which could be easily limited with high switching frequency. The high switching losses can be reduced to the half with the utilization of the well-known Flat-top modulation. The suggested DC Link Floating (DLF) control method is an extension of the Flat-top modulation with which the switching losses could be further reduced.